YQ Connector: support managed ClickHouse

Со стороны dqrun можно обратиться к инстансу коннектора, который работает на streaming стенде, и извлечь данные из облачного CH.

42 files changed, 37749 insertions, 0 deletions

diff --git a/contrib/libs/clang14/lib/Frontend/ASTConsumers.cpp b/contrib/libs/clang14/lib/Frontend/ASTConsumers.cpp
new file mode 100644
index 0000000000..96f5926c0d
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ASTConsumers.cpp
@@ -0,0 +1,217 @@
+//===--- ASTConsumers.cpp - ASTConsumer implementations -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// AST Consumer Implementations.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/ASTConsumers.h"
+#include "clang/AST/AST.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/PrettyPrinter.h"
+#include "clang/AST/RecordLayout.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+/// ASTPrinter - Pretty-printer and dumper of ASTs
+
+namespace {
+  class ASTPrinter : public ASTConsumer,
+                     public RecursiveASTVisitor<ASTPrinter> {
+    typedef RecursiveASTVisitor<ASTPrinter> base;
+
+  public:
+    enum Kind { DumpFull, Dump, Print, None };
+    ASTPrinter(std::unique_ptr<raw_ostream> Out, Kind K,
+               ASTDumpOutputFormat Format, StringRef FilterString,
+               bool DumpLookups = false, bool DumpDeclTypes = false)
+        : Out(Out ? *Out : llvm::outs()), OwnedOut(std::move(Out)),
+          OutputKind(K), OutputFormat(Format), FilterString(FilterString),
+          DumpLookups(DumpLookups), DumpDeclTypes(DumpDeclTypes) {}
+
+    void HandleTranslationUnit(ASTContext &Context) override {
+      TranslationUnitDecl *D = Context.getTranslationUnitDecl();
+
+      if (FilterString.empty())
+        return print(D);
+
+      TraverseDecl(D);
+    }
+
+    bool shouldWalkTypesOfTypeLocs() const { return false; }
+
+    bool TraverseDecl(Decl *D) {
+      if (D && filterMatches(D)) {
+        bool ShowColors = Out.has_colors();
+        if (ShowColors)
+          Out.changeColor(raw_ostream::BLUE);
+
+        if (OutputFormat == ADOF_Default)
+          Out << (OutputKind != Print ? "Dumping " : "Printing ") << getName(D)
+              << ":\n";
+
+        if (ShowColors)
+          Out.resetColor();
+        print(D);
+        Out << "\n";
+        // Don't traverse child nodes to avoid output duplication.
+        return true;
+      }
+      return base::TraverseDecl(D);
+    }
+
+  private:
+    std::string getName(Decl *D) {
+      if (isa<NamedDecl>(D))
+        return cast<NamedDecl>(D)->getQualifiedNameAsString();
+      return "";
+    }
+    bool filterMatches(Decl *D) {
+      return getName(D).find(FilterString) != std::string::npos;
+    }
+    void print(Decl *D) {
+      if (DumpLookups) {
+        if (DeclContext *DC = dyn_cast<DeclContext>(D)) {
+          if (DC == DC->getPrimaryContext())
+            DC->dumpLookups(Out, OutputKind != None, OutputKind == DumpFull);
+          else
+            Out << "Lookup map is in primary DeclContext "
+                << DC->getPrimaryContext() << "\n";
+        } else
+          Out << "Not a DeclContext\n";
+      } else if (OutputKind == Print) {
+        PrintingPolicy Policy(D->getASTContext().getLangOpts());
+        D->print(Out, Policy, /*Indentation=*/0, /*PrintInstantiation=*/true);
+      } else if (OutputKind != None) {
+        D->dump(Out, OutputKind == DumpFull, OutputFormat);
+      }
+
+      if (DumpDeclTypes) {
+        Decl *InnerD = D;
+        if (auto *TD = dyn_cast<TemplateDecl>(D))
+          InnerD = TD->getTemplatedDecl();
+
+        // FIXME: Support OutputFormat in type dumping.
+        // FIXME: Support combining -ast-dump-decl-types with -ast-dump-lookups.
+        if (auto *VD = dyn_cast<ValueDecl>(InnerD))
+          VD->getType().dump(Out, VD->getASTContext());
+        if (auto *TD = dyn_cast<TypeDecl>(InnerD))
+          TD->getTypeForDecl()->dump(Out, TD->getASTContext());
+      }
+    }
+
+    raw_ostream &Out;
+    std::unique_ptr<raw_ostream> OwnedOut;
+
+    /// How to output individual declarations.
+    Kind OutputKind;
+
+    /// What format should the output take?
+    ASTDumpOutputFormat OutputFormat;
+
+    /// Which declarations or DeclContexts to display.
+    std::string FilterString;
+
+    /// Whether the primary output is lookup results or declarations. Individual
+    /// results will be output with a format determined by OutputKind. This is
+    /// incompatible with OutputKind == Print.
+    bool DumpLookups;
+
+    /// Whether to dump the type for each declaration dumped.
+    bool DumpDeclTypes;
+  };
+
+  class ASTDeclNodeLister : public ASTConsumer,
+                     public RecursiveASTVisitor<ASTDeclNodeLister> {
+  public:
+    ASTDeclNodeLister(raw_ostream *Out = nullptr)
+        : Out(Out ? *Out : llvm::outs()) {}
+
+    void HandleTranslationUnit(ASTContext &Context) override {
+      TraverseDecl(Context.getTranslationUnitDecl());
+    }
+
+    bool shouldWalkTypesOfTypeLocs() const { return false; }
+
+    bool VisitNamedDecl(NamedDecl *D) {
+      D->printQualifiedName(Out);
+      Out << '\n';
+      return true;
+    }
+
+  private:
+    raw_ostream &Out;
+  };
+} // end anonymous namespace
+
+std::unique_ptr<ASTConsumer>
+clang::CreateASTPrinter(std::unique_ptr<raw_ostream> Out,
+                        StringRef FilterString) {
+  return std::make_unique<ASTPrinter>(std::move(Out), ASTPrinter::Print,
+                                       ADOF_Default, FilterString);
+}
+
+std::unique_ptr<ASTConsumer>
+clang::CreateASTDumper(std::unique_ptr<raw_ostream> Out, StringRef FilterString,
+                       bool DumpDecls, bool Deserialize, bool DumpLookups,
+                       bool DumpDeclTypes, ASTDumpOutputFormat Format) {
+  assert((DumpDecls || Deserialize || DumpLookups) && "nothing to dump");
+  return std::make_unique<ASTPrinter>(
+      std::move(Out),
+      Deserialize ? ASTPrinter::DumpFull
+                  : DumpDecls ? ASTPrinter::Dump : ASTPrinter::None,
+      Format, FilterString, DumpLookups, DumpDeclTypes);
+}
+
+std::unique_ptr<ASTConsumer> clang::CreateASTDeclNodeLister() {
+  return std::make_unique<ASTDeclNodeLister>(nullptr);
+}
+
+//===----------------------------------------------------------------------===//
+/// ASTViewer - AST Visualization
+
+namespace {
+  class ASTViewer : public ASTConsumer {
+    ASTContext *Context;
+  public:
+    void Initialize(ASTContext &Context) override {
+      this->Context = &Context;
+    }
+
+    bool HandleTopLevelDecl(DeclGroupRef D) override {
+      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I)
+        HandleTopLevelSingleDecl(*I);
+      return true;
+    }
+
+    void HandleTopLevelSingleDecl(Decl *D);
+  };
+}
+
+void ASTViewer::HandleTopLevelSingleDecl(Decl *D) {
+  if (isa<FunctionDecl>(D) || isa<ObjCMethodDecl>(D)) {
+    D->print(llvm::errs());
+
+    if (Stmt *Body = D->getBody()) {
+      llvm::errs() << '\n';
+      Body->viewAST();
+      llvm::errs() << '\n';
+    }
+  }
+}
+
+std::unique_ptr<ASTConsumer> clang::CreateASTViewer() {
+  return std::make_unique<ASTViewer>();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/ASTMerge.cpp b/contrib/libs/clang14/lib/Frontend/ASTMerge.cpp
new file mode 100644
index 0000000000..14d781ccdf
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ASTMerge.cpp
@@ -0,0 +1,114 @@
+//===-- ASTMerge.cpp - AST Merging Frontend Action --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTDiagnostic.h"
+#include "clang/AST/ASTImporter.h"
+#include "clang/AST/ASTImporterSharedState.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+
+using namespace clang;
+
+std::unique_ptr<ASTConsumer>
+ASTMergeAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return AdaptedAction->CreateASTConsumer(CI, InFile);
+}
+
+bool ASTMergeAction::BeginSourceFileAction(CompilerInstance &CI) {
+  // FIXME: This is a hack. We need a better way to communicate the
+  // AST file, compiler instance, and file name than member variables
+  // of FrontendAction.
+  AdaptedAction->setCurrentInput(getCurrentInput(), takeCurrentASTUnit());
+  AdaptedAction->setCompilerInstance(&CI);
+  return AdaptedAction->BeginSourceFileAction(CI);
+}
+
+void ASTMergeAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  CI.getDiagnostics().getClient()->BeginSourceFile(
+                                             CI.getASTContext().getLangOpts());
+  CI.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
+                                       &CI.getASTContext());
+  IntrusiveRefCntPtr<DiagnosticIDs>
+      DiagIDs(CI.getDiagnostics().getDiagnosticIDs());
+  auto SharedState = std::make_shared<ASTImporterSharedState>(
+      *CI.getASTContext().getTranslationUnitDecl());
+  for (unsigned I = 0, N = ASTFiles.size(); I != N; ++I) {
+    IntrusiveRefCntPtr<DiagnosticsEngine>
+        Diags(new DiagnosticsEngine(DiagIDs, &CI.getDiagnosticOpts(),
+                                    new ForwardingDiagnosticConsumer(
+                                          *CI.getDiagnostics().getClient()),
+                                    /*ShouldOwnClient=*/true));
+    std::unique_ptr<ASTUnit> Unit = ASTUnit::LoadFromASTFile(
+        ASTFiles[I], CI.getPCHContainerReader(), ASTUnit::LoadEverything, Diags,
+        CI.getFileSystemOpts(), false);
+
+    if (!Unit)
+      continue;
+
+    ASTImporter Importer(CI.getASTContext(), CI.getFileManager(),
+                         Unit->getASTContext(), Unit->getFileManager(),
+                         /*MinimalImport=*/false, SharedState);
+
+    TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
+    for (auto *D : TU->decls()) {
+      // Don't re-import __va_list_tag, __builtin_va_list.
+      if (const auto *ND = dyn_cast<NamedDecl>(D))
+        if (IdentifierInfo *II = ND->getIdentifier())
+          if (II->isStr("__va_list_tag") || II->isStr("__builtin_va_list"))
+            continue;
+
+      llvm::Expected<Decl *> ToDOrError = Importer.Import(D);
+
+      if (ToDOrError) {
+        DeclGroupRef DGR(*ToDOrError);
+        CI.getASTConsumer().HandleTopLevelDecl(DGR);
+      } else {
+        llvm::consumeError(ToDOrError.takeError());
+      }
+    }
+  }
+
+  AdaptedAction->ExecuteAction();
+  CI.getDiagnostics().getClient()->EndSourceFile();
+}
+
+void ASTMergeAction::EndSourceFileAction() {
+  return AdaptedAction->EndSourceFileAction();
+}
+
+ASTMergeAction::ASTMergeAction(std::unique_ptr<FrontendAction> adaptedAction,
+                               ArrayRef<std::string> ASTFiles)
+: AdaptedAction(std::move(adaptedAction)), ASTFiles(ASTFiles.begin(), ASTFiles.end()) {
+  assert(AdaptedAction && "ASTMergeAction needs an action to adapt");
+}
+
+ASTMergeAction::~ASTMergeAction() {
+}
+
+bool ASTMergeAction::usesPreprocessorOnly() const {
+  return AdaptedAction->usesPreprocessorOnly();
+}
+
+TranslationUnitKind ASTMergeAction::getTranslationUnitKind() {
+  return AdaptedAction->getTranslationUnitKind();
+}
+
+bool ASTMergeAction::hasPCHSupport() const {
+  return AdaptedAction->hasPCHSupport();
+}
+
+bool ASTMergeAction::hasASTFileSupport() const {
+  return AdaptedAction->hasASTFileSupport();
+}
+
+bool ASTMergeAction::hasCodeCompletionSupport() const {
+  return AdaptedAction->hasCodeCompletionSupport();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/ASTUnit.cpp b/contrib/libs/clang14/lib/Frontend/ASTUnit.cpp
new file mode 100644
index 0000000000..5f587cc1c0
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ASTUnit.cpp
@@ -0,0 +1,2692 @@
+//===- ASTUnit.cpp - ASTUnit utility --------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// ASTUnit Implementation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/CommentCommandTraits.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclBase.h"
+#include "clang/AST/DeclCXX.h"
+#include "clang/AST/DeclGroup.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/AST/DeclarationName.h"
+#include "clang/AST/ExternalASTSource.h"
+#include "clang/AST/PrettyPrinter.h"
+#include "clang/AST/Type.h"
+#include "clang/AST/TypeOrdering.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Basic/Module.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/TargetOptions.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/CompilerInvocation.h"
+#include "clang/Frontend/FrontendAction.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendOptions.h"
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/Frontend/PrecompiledPreamble.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/HeaderSearchOptions.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/PreprocessingRecord.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Lex/Token.h"
+#include "clang/Sema/CodeCompleteConsumer.h"
+#include "clang/Sema/CodeCompleteOptions.h"
+#include "clang/Sema/Sema.h"
+#include "clang/Serialization/ASTBitCodes.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "clang/Serialization/ContinuousRangeMap.h"
+#include "clang/Serialization/InMemoryModuleCache.h"
+#include "clang/Serialization/ModuleFile.h"
+#include "clang/Serialization/PCHContainerOperations.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/ScopeExit.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/CrashRecoveryContext.h"
+#include "llvm/Support/DJB.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <atomic>
+#include <cassert>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+using namespace clang;
+
+using llvm::TimeRecord;
+
+namespace {
+
+  class SimpleTimer {
+    bool WantTiming;
+    TimeRecord Start;
+    std::string Output;
+
+  public:
+    explicit SimpleTimer(bool WantTiming) : WantTiming(WantTiming) {
+      if (WantTiming)
+        Start = TimeRecord::getCurrentTime();
+    }
+
+    ~SimpleTimer() {
+      if (WantTiming) {
+        TimeRecord Elapsed = TimeRecord::getCurrentTime();
+        Elapsed -= Start;
+        llvm::errs() << Output << ':';
+        Elapsed.print(Elapsed, llvm::errs());
+        llvm::errs() << '\n';
+      }
+    }
+
+    void setOutput(const Twine &Output) {
+      if (WantTiming)
+        this->Output = Output.str();
+    }
+  };
+
+} // namespace
+
+template <class T>
+static std::unique_ptr<T> valueOrNull(llvm::ErrorOr<std::unique_ptr<T>> Val) {
+  if (!Val)
+    return nullptr;
+  return std::move(*Val);
+}
+
+template <class T>
+static bool moveOnNoError(llvm::ErrorOr<T> Val, T &Output) {
+  if (!Val)
+    return false;
+  Output = std::move(*Val);
+  return true;
+}
+
+/// Get a source buffer for \p MainFilePath, handling all file-to-file
+/// and file-to-buffer remappings inside \p Invocation.
+static std::unique_ptr<llvm::MemoryBuffer>
+getBufferForFileHandlingRemapping(const CompilerInvocation &Invocation,
+                                  llvm::vfs::FileSystem *VFS,
+                                  StringRef FilePath, bool isVolatile) {
+  const auto &PreprocessorOpts = Invocation.getPreprocessorOpts();
+
+  // Try to determine if the main file has been remapped, either from the
+  // command line (to another file) or directly through the compiler
+  // invocation (to a memory buffer).
+  llvm::MemoryBuffer *Buffer = nullptr;
+  std::unique_ptr<llvm::MemoryBuffer> BufferOwner;
+  auto FileStatus = VFS->status(FilePath);
+  if (FileStatus) {
+    llvm::sys::fs::UniqueID MainFileID = FileStatus->getUniqueID();
+
+    // Check whether there is a file-file remapping of the main file
+    for (const auto &RF : PreprocessorOpts.RemappedFiles) {
+      std::string MPath(RF.first);
+      auto MPathStatus = VFS->status(MPath);
+      if (MPathStatus) {
+        llvm::sys::fs::UniqueID MID = MPathStatus->getUniqueID();
+        if (MainFileID == MID) {
+          // We found a remapping. Try to load the resulting, remapped source.
+          BufferOwner = valueOrNull(VFS->getBufferForFile(RF.second, -1, true, isVolatile));
+          if (!BufferOwner)
+            return nullptr;
+        }
+      }
+    }
+
+    // Check whether there is a file-buffer remapping. It supercedes the
+    // file-file remapping.
+    for (const auto &RB : PreprocessorOpts.RemappedFileBuffers) {
+      std::string MPath(RB.first);
+      auto MPathStatus = VFS->status(MPath);
+      if (MPathStatus) {
+        llvm::sys::fs::UniqueID MID = MPathStatus->getUniqueID();
+        if (MainFileID == MID) {
+          // We found a remapping.
+          BufferOwner.reset();
+          Buffer = const_cast<llvm::MemoryBuffer *>(RB.second);
+        }
+      }
+    }
+  }
+
+  // If the main source file was not remapped, load it now.
+  if (!Buffer && !BufferOwner) {
+    BufferOwner = valueOrNull(VFS->getBufferForFile(FilePath, -1, true, isVolatile));
+    if (!BufferOwner)
+      return nullptr;
+  }
+
+  if (BufferOwner)
+    return BufferOwner;
+  if (!Buffer)
+    return nullptr;
+  return llvm::MemoryBuffer::getMemBufferCopy(Buffer->getBuffer(), FilePath);
+}
+
+struct ASTUnit::ASTWriterData {
+  SmallString<128> Buffer;
+  llvm::BitstreamWriter Stream;
+  ASTWriter Writer;
+
+  ASTWriterData(InMemoryModuleCache &ModuleCache)
+      : Stream(Buffer), Writer(Stream, Buffer, ModuleCache, {}) {}
+};
+
+void ASTUnit::clearFileLevelDecls() {
+  FileDecls.clear();
+}
+
+/// After failing to build a precompiled preamble (due to
+/// errors in the source that occurs in the preamble), the number of
+/// reparses during which we'll skip even trying to precompile the
+/// preamble.
+const unsigned DefaultPreambleRebuildInterval = 5;
+
+/// Tracks the number of ASTUnit objects that are currently active.
+///
+/// Used for debugging purposes only.
+static std::atomic<unsigned> ActiveASTUnitObjects;
+
+ASTUnit::ASTUnit(bool _MainFileIsAST)
+    : MainFileIsAST(_MainFileIsAST), WantTiming(getenv("LIBCLANG_TIMING")),
+      ShouldCacheCodeCompletionResults(false),
+      IncludeBriefCommentsInCodeCompletion(false), UserFilesAreVolatile(false),
+      UnsafeToFree(false) {
+  if (getenv("LIBCLANG_OBJTRACKING"))
+    fprintf(stderr, "+++ %u translation units\n", ++ActiveASTUnitObjects);
+}
+
+ASTUnit::~ASTUnit() {
+  // If we loaded from an AST file, balance out the BeginSourceFile call.
+  if (MainFileIsAST && getDiagnostics().getClient()) {
+    getDiagnostics().getClient()->EndSourceFile();
+  }
+
+  clearFileLevelDecls();
+
+  // Free the buffers associated with remapped files. We are required to
+  // perform this operation here because we explicitly request that the
+  // compiler instance *not* free these buffers for each invocation of the
+  // parser.
+  if (Invocation && OwnsRemappedFileBuffers) {
+    PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
+    for (const auto &RB : PPOpts.RemappedFileBuffers)
+      delete RB.second;
+  }
+
+  ClearCachedCompletionResults();
+
+  if (getenv("LIBCLANG_OBJTRACKING"))
+    fprintf(stderr, "--- %u translation units\n", --ActiveASTUnitObjects);
+}
+
+void ASTUnit::setPreprocessor(std::shared_ptr<Preprocessor> PP) {
+  this->PP = std::move(PP);
+}
+
+void ASTUnit::enableSourceFileDiagnostics() {
+  assert(getDiagnostics().getClient() && Ctx &&
+      "Bad context for source file");
+  getDiagnostics().getClient()->BeginSourceFile(Ctx->getLangOpts(), PP.get());
+}
+
+/// Determine the set of code-completion contexts in which this
+/// declaration should be shown.
+static uint64_t getDeclShowContexts(const NamedDecl *ND,
+                                    const LangOptions &LangOpts,
+                                    bool &IsNestedNameSpecifier) {
+  IsNestedNameSpecifier = false;
+
+  if (isa<UsingShadowDecl>(ND))
+    ND = ND->getUnderlyingDecl();
+  if (!ND)
+    return 0;
+
+  uint64_t Contexts = 0;
+  if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND) ||
+      isa<ClassTemplateDecl>(ND) || isa<TemplateTemplateParmDecl>(ND) ||
+      isa<TypeAliasTemplateDecl>(ND)) {
+    // Types can appear in these contexts.
+    if (LangOpts.CPlusPlus || !isa<TagDecl>(ND))
+      Contexts |= (1LL << CodeCompletionContext::CCC_TopLevel)
+               |  (1LL << CodeCompletionContext::CCC_ObjCIvarList)
+               |  (1LL << CodeCompletionContext::CCC_ClassStructUnion)
+               |  (1LL << CodeCompletionContext::CCC_Statement)
+               |  (1LL << CodeCompletionContext::CCC_Type)
+               |  (1LL << CodeCompletionContext::CCC_ParenthesizedExpression);
+
+    // In C++, types can appear in expressions contexts (for functional casts).
+    if (LangOpts.CPlusPlus)
+      Contexts |= (1LL << CodeCompletionContext::CCC_Expression);
+
+    // In Objective-C, message sends can send interfaces. In Objective-C++,
+    // all types are available due to functional casts.
+    if (LangOpts.CPlusPlus || isa<ObjCInterfaceDecl>(ND))
+      Contexts |= (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver);
+
+    // In Objective-C, you can only be a subclass of another Objective-C class
+    if (const auto *ID = dyn_cast<ObjCInterfaceDecl>(ND)) {
+      // Objective-C interfaces can be used in a class property expression.
+      if (ID->getDefinition())
+        Contexts |= (1LL << CodeCompletionContext::CCC_Expression);
+      Contexts |= (1LL << CodeCompletionContext::CCC_ObjCInterfaceName);
+    }
+
+    // Deal with tag names.
+    if (isa<EnumDecl>(ND)) {
+      Contexts |= (1LL << CodeCompletionContext::CCC_EnumTag);
+
+      // Part of the nested-name-specifier in C++0x.
+      if (LangOpts.CPlusPlus11)
+        IsNestedNameSpecifier = true;
+    } else if (const auto *Record = dyn_cast<RecordDecl>(ND)) {
+      if (Record->isUnion())
+        Contexts |= (1LL << CodeCompletionContext::CCC_UnionTag);
+      else
+        Contexts |= (1LL << CodeCompletionContext::CCC_ClassOrStructTag);
+
+      if (LangOpts.CPlusPlus)
+        IsNestedNameSpecifier = true;
+    } else if (isa<ClassTemplateDecl>(ND))
+      IsNestedNameSpecifier = true;
+  } else if (isa<ValueDecl>(ND) || isa<FunctionTemplateDecl>(ND)) {
+    // Values can appear in these contexts.
+    Contexts = (1LL << CodeCompletionContext::CCC_Statement)
+             | (1LL << CodeCompletionContext::CCC_Expression)
+             | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression)
+             | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver);
+  } else if (isa<ObjCProtocolDecl>(ND)) {
+    Contexts = (1LL << CodeCompletionContext::CCC_ObjCProtocolName);
+  } else if (isa<ObjCCategoryDecl>(ND)) {
+    Contexts = (1LL << CodeCompletionContext::CCC_ObjCCategoryName);
+  } else if (isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND)) {
+    Contexts = (1LL << CodeCompletionContext::CCC_Namespace);
+
+    // Part of the nested-name-specifier.
+    IsNestedNameSpecifier = true;
+  }
+
+  return Contexts;
+}
+
+void ASTUnit::CacheCodeCompletionResults() {
+  if (!TheSema)
+    return;
+
+  SimpleTimer Timer(WantTiming);
+  Timer.setOutput("Cache global code completions for " + getMainFileName());
+
+  // Clear out the previous results.
+  ClearCachedCompletionResults();
+
+  // Gather the set of global code completions.
+  using Result = CodeCompletionResult;
+  SmallVector<Result, 8> Results;
+  CachedCompletionAllocator = std::make_shared<GlobalCodeCompletionAllocator>();
+  CodeCompletionTUInfo CCTUInfo(CachedCompletionAllocator);
+  TheSema->GatherGlobalCodeCompletions(*CachedCompletionAllocator,
+                                       CCTUInfo, Results);
+
+  // Translate global code completions into cached completions.
+  llvm::DenseMap<CanQualType, unsigned> CompletionTypes;
+  CodeCompletionContext CCContext(CodeCompletionContext::CCC_TopLevel);
+
+  for (auto &R : Results) {
+    switch (R.Kind) {
+    case Result::RK_Declaration: {
+      bool IsNestedNameSpecifier = false;
+      CachedCodeCompletionResult CachedResult;
+      CachedResult.Completion = R.CreateCodeCompletionString(
+          *TheSema, CCContext, *CachedCompletionAllocator, CCTUInfo,
+          IncludeBriefCommentsInCodeCompletion);
+      CachedResult.ShowInContexts = getDeclShowContexts(
+          R.Declaration, Ctx->getLangOpts(), IsNestedNameSpecifier);
+      CachedResult.Priority = R.Priority;
+      CachedResult.Kind = R.CursorKind;
+      CachedResult.Availability = R.Availability;
+
+      // Keep track of the type of this completion in an ASTContext-agnostic
+      // way.
+      QualType UsageType = getDeclUsageType(*Ctx, R.Declaration);
+      if (UsageType.isNull()) {
+        CachedResult.TypeClass = STC_Void;
+        CachedResult.Type = 0;
+      } else {
+        CanQualType CanUsageType
+          = Ctx->getCanonicalType(UsageType.getUnqualifiedType());
+        CachedResult.TypeClass = getSimplifiedTypeClass(CanUsageType);
+
+        // Determine whether we have already seen this type. If so, we save
+        // ourselves the work of formatting the type string by using the
+        // temporary, CanQualType-based hash table to find the associated value.
+        unsigned &TypeValue = CompletionTypes[CanUsageType];
+        if (TypeValue == 0) {
+          TypeValue = CompletionTypes.size();
+          CachedCompletionTypes[QualType(CanUsageType).getAsString()]
+            = TypeValue;
+        }
+
+        CachedResult.Type = TypeValue;
+      }
+
+      CachedCompletionResults.push_back(CachedResult);
+
+      /// Handle nested-name-specifiers in C++.
+      if (TheSema->Context.getLangOpts().CPlusPlus && IsNestedNameSpecifier &&
+          !R.StartsNestedNameSpecifier) {
+        // The contexts in which a nested-name-specifier can appear in C++.
+        uint64_t NNSContexts
+          = (1LL << CodeCompletionContext::CCC_TopLevel)
+          | (1LL << CodeCompletionContext::CCC_ObjCIvarList)
+          | (1LL << CodeCompletionContext::CCC_ClassStructUnion)
+          | (1LL << CodeCompletionContext::CCC_Statement)
+          | (1LL << CodeCompletionContext::CCC_Expression)
+          | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver)
+          | (1LL << CodeCompletionContext::CCC_EnumTag)
+          | (1LL << CodeCompletionContext::CCC_UnionTag)
+          | (1LL << CodeCompletionContext::CCC_ClassOrStructTag)
+          | (1LL << CodeCompletionContext::CCC_Type)
+          | (1LL << CodeCompletionContext::CCC_SymbolOrNewName)
+          | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression);
+
+        if (isa<NamespaceDecl>(R.Declaration) ||
+            isa<NamespaceAliasDecl>(R.Declaration))
+          NNSContexts |= (1LL << CodeCompletionContext::CCC_Namespace);
+
+        if (uint64_t RemainingContexts
+                                = NNSContexts & ~CachedResult.ShowInContexts) {
+          // If there any contexts where this completion can be a
+          // nested-name-specifier but isn't already an option, create a
+          // nested-name-specifier completion.
+          R.StartsNestedNameSpecifier = true;
+          CachedResult.Completion = R.CreateCodeCompletionString(
+              *TheSema, CCContext, *CachedCompletionAllocator, CCTUInfo,
+              IncludeBriefCommentsInCodeCompletion);
+          CachedResult.ShowInContexts = RemainingContexts;
+          CachedResult.Priority = CCP_NestedNameSpecifier;
+          CachedResult.TypeClass = STC_Void;
+          CachedResult.Type = 0;
+          CachedCompletionResults.push_back(CachedResult);
+        }
+      }
+      break;
+    }
+
+    case Result::RK_Keyword:
+    case Result::RK_Pattern:
+      // Ignore keywords and patterns; we don't care, since they are so
+      // easily regenerated.
+      break;
+
+    case Result::RK_Macro: {
+      CachedCodeCompletionResult CachedResult;
+      CachedResult.Completion = R.CreateCodeCompletionString(
+          *TheSema, CCContext, *CachedCompletionAllocator, CCTUInfo,
+          IncludeBriefCommentsInCodeCompletion);
+      CachedResult.ShowInContexts
+        = (1LL << CodeCompletionContext::CCC_TopLevel)
+        | (1LL << CodeCompletionContext::CCC_ObjCInterface)
+        | (1LL << CodeCompletionContext::CCC_ObjCImplementation)
+        | (1LL << CodeCompletionContext::CCC_ObjCIvarList)
+        | (1LL << CodeCompletionContext::CCC_ClassStructUnion)
+        | (1LL << CodeCompletionContext::CCC_Statement)
+        | (1LL << CodeCompletionContext::CCC_Expression)
+        | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver)
+        | (1LL << CodeCompletionContext::CCC_MacroNameUse)
+        | (1LL << CodeCompletionContext::CCC_PreprocessorExpression)
+        | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression)
+        | (1LL << CodeCompletionContext::CCC_OtherWithMacros);
+
+      CachedResult.Priority = R.Priority;
+      CachedResult.Kind = R.CursorKind;
+      CachedResult.Availability = R.Availability;
+      CachedResult.TypeClass = STC_Void;
+      CachedResult.Type = 0;
+      CachedCompletionResults.push_back(CachedResult);
+      break;
+    }
+    }
+  }
+
+  // Save the current top-level hash value.
+  CompletionCacheTopLevelHashValue = CurrentTopLevelHashValue;
+}
+
+void ASTUnit::ClearCachedCompletionResults() {
+  CachedCompletionResults.clear();
+  CachedCompletionTypes.clear();
+  CachedCompletionAllocator = nullptr;
+}
+
+namespace {
+
+/// Gathers information from ASTReader that will be used to initialize
+/// a Preprocessor.
+class ASTInfoCollector : public ASTReaderListener {
+  Preprocessor &PP;
+  ASTContext *Context;
+  HeaderSearchOptions &HSOpts;
+  PreprocessorOptions &PPOpts;
+  LangOptions &LangOpt;
+  std::shared_ptr<TargetOptions> &TargetOpts;
+  IntrusiveRefCntPtr<TargetInfo> &Target;
+  unsigned &Counter;
+  bool InitializedLanguage = false;
+
+public:
+  ASTInfoCollector(Preprocessor &PP, ASTContext *Context,
+                   HeaderSearchOptions &HSOpts, PreprocessorOptions &PPOpts,
+                   LangOptions &LangOpt,
+                   std::shared_ptr<TargetOptions> &TargetOpts,
+                   IntrusiveRefCntPtr<TargetInfo> &Target, unsigned &Counter)
+      : PP(PP), Context(Context), HSOpts(HSOpts), PPOpts(PPOpts),
+        LangOpt(LangOpt), TargetOpts(TargetOpts), Target(Target),
+        Counter(Counter) {}
+
+  bool ReadLanguageOptions(const LangOptions &LangOpts, bool Complain,
+                           bool AllowCompatibleDifferences) override {
+    if (InitializedLanguage)
+      return false;
+
+    LangOpt = LangOpts;
+    InitializedLanguage = true;
+
+    updated();
+    return false;
+  }
+
+  bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
+                               StringRef SpecificModuleCachePath,
+                               bool Complain) override {
+    this->HSOpts = HSOpts;
+    return false;
+  }
+
+  bool ReadPreprocessorOptions(const PreprocessorOptions &PPOpts, bool Complain,
+                               std::string &SuggestedPredefines) override {
+    this->PPOpts = PPOpts;
+    return false;
+  }
+
+  bool ReadTargetOptions(const TargetOptions &TargetOpts, bool Complain,
+                         bool AllowCompatibleDifferences) override {
+    // If we've already initialized the target, don't do it again.
+    if (Target)
+      return false;
+
+    this->TargetOpts = std::make_shared<TargetOptions>(TargetOpts);
+    Target =
+        TargetInfo::CreateTargetInfo(PP.getDiagnostics(), this->TargetOpts);
+
+    updated();
+    return false;
+  }
+
+  void ReadCounter(const serialization::ModuleFile &M,
+                   unsigned Value) override {
+    Counter = Value;
+  }
+
+private:
+  void updated() {
+    if (!Target || !InitializedLanguage)
+      return;
+
+    // Inform the target of the language options.
+    //
+    // FIXME: We shouldn't need to do this, the target should be immutable once
+    // created. This complexity should be lifted elsewhere.
+    Target->adjust(PP.getDiagnostics(), LangOpt);
+
+    // Initialize the preprocessor.
+    PP.Initialize(*Target);
+
+    if (!Context)
+      return;
+
+    // Initialize the ASTContext
+    Context->InitBuiltinTypes(*Target);
+
+    // Adjust printing policy based on language options.
+    Context->setPrintingPolicy(PrintingPolicy(LangOpt));
+
+    // We didn't have access to the comment options when the ASTContext was
+    // constructed, so register them now.
+    Context->getCommentCommandTraits().registerCommentOptions(
+        LangOpt.CommentOpts);
+  }
+};
+
+/// Diagnostic consumer that saves each diagnostic it is given.
+class FilterAndStoreDiagnosticConsumer : public DiagnosticConsumer {
+  SmallVectorImpl<StoredDiagnostic> *StoredDiags;
+  SmallVectorImpl<ASTUnit::StandaloneDiagnostic> *StandaloneDiags;
+  bool CaptureNonErrorsFromIncludes = true;
+  const LangOptions *LangOpts = nullptr;
+  SourceManager *SourceMgr = nullptr;
+
+public:
+  FilterAndStoreDiagnosticConsumer(
+      SmallVectorImpl<StoredDiagnostic> *StoredDiags,
+      SmallVectorImpl<ASTUnit::StandaloneDiagnostic> *StandaloneDiags,
+      bool CaptureNonErrorsFromIncludes)
+      : StoredDiags(StoredDiags), StandaloneDiags(StandaloneDiags),
+        CaptureNonErrorsFromIncludes(CaptureNonErrorsFromIncludes) {
+    assert((StoredDiags || StandaloneDiags) &&
+           "No output collections were passed to StoredDiagnosticConsumer.");
+  }
+
+  void BeginSourceFile(const LangOptions &LangOpts,
+                       const Preprocessor *PP = nullptr) override {
+    this->LangOpts = &LangOpts;
+    if (PP)
+      SourceMgr = &PP->getSourceManager();
+  }
+
+  void HandleDiagnostic(DiagnosticsEngine::Level Level,
+                        const Diagnostic &Info) override;
+};
+
+/// RAII object that optionally captures and filters diagnostics, if
+/// there is no diagnostic client to capture them already.
+class CaptureDroppedDiagnostics {
+  DiagnosticsEngine &Diags;
+  FilterAndStoreDiagnosticConsumer Client;
+  DiagnosticConsumer *PreviousClient = nullptr;
+  std::unique_ptr<DiagnosticConsumer> OwningPreviousClient;
+
+public:
+  CaptureDroppedDiagnostics(
+      CaptureDiagsKind CaptureDiagnostics, DiagnosticsEngine &Diags,
+      SmallVectorImpl<StoredDiagnostic> *StoredDiags,
+      SmallVectorImpl<ASTUnit::StandaloneDiagnostic> *StandaloneDiags)
+      : Diags(Diags),
+        Client(StoredDiags, StandaloneDiags,
+               CaptureDiagnostics !=
+                   CaptureDiagsKind::AllWithoutNonErrorsFromIncludes) {
+    if (CaptureDiagnostics != CaptureDiagsKind::None ||
+        Diags.getClient() == nullptr) {
+      OwningPreviousClient = Diags.takeClient();
+      PreviousClient = Diags.getClient();
+      Diags.setClient(&Client, false);
+    }
+  }
+
+  ~CaptureDroppedDiagnostics() {
+    if (Diags.getClient() == &Client)
+      Diags.setClient(PreviousClient, !!OwningPreviousClient.release());
+  }
+};
+
+} // namespace
+
+static ASTUnit::StandaloneDiagnostic
+makeStandaloneDiagnostic(const LangOptions &LangOpts,
+                         const StoredDiagnostic &InDiag);
+
+static bool isInMainFile(const clang::Diagnostic &D) {
+  if (!D.hasSourceManager() || !D.getLocation().isValid())
+    return false;
+
+  auto &M = D.getSourceManager();
+  return M.isWrittenInMainFile(M.getExpansionLoc(D.getLocation()));
+}
+
+void FilterAndStoreDiagnosticConsumer::HandleDiagnostic(
+    DiagnosticsEngine::Level Level, const Diagnostic &Info) {
+  // Default implementation (Warnings/errors count).
+  DiagnosticConsumer::HandleDiagnostic(Level, Info);
+
+  // Only record the diagnostic if it's part of the source manager we know
+  // about. This effectively drops diagnostics from modules we're building.
+  // FIXME: In the long run, ee don't want to drop source managers from modules.
+  if (!Info.hasSourceManager() || &Info.getSourceManager() == SourceMgr) {
+    if (!CaptureNonErrorsFromIncludes && Level <= DiagnosticsEngine::Warning &&
+        !isInMainFile(Info)) {
+      return;
+    }
+
+    StoredDiagnostic *ResultDiag = nullptr;
+    if (StoredDiags) {
+      StoredDiags->emplace_back(Level, Info);
+      ResultDiag = &StoredDiags->back();
+    }
+
+    if (StandaloneDiags) {
+      llvm::Optional<StoredDiagnostic> StoredDiag = None;
+      if (!ResultDiag) {
+        StoredDiag.emplace(Level, Info);
+        ResultDiag = StoredDiag.getPointer();
+      }
+      StandaloneDiags->push_back(
+          makeStandaloneDiagnostic(*LangOpts, *ResultDiag));
+    }
+  }
+}
+
+IntrusiveRefCntPtr<ASTReader> ASTUnit::getASTReader() const {
+  return Reader;
+}
+
+ASTMutationListener *ASTUnit::getASTMutationListener() {
+  if (WriterData)
+    return &WriterData->Writer;
+  return nullptr;
+}
+
+ASTDeserializationListener *ASTUnit::getDeserializationListener() {
+  if (WriterData)
+    return &WriterData->Writer;
+  return nullptr;
+}
+
+std::unique_ptr<llvm::MemoryBuffer>
+ASTUnit::getBufferForFile(StringRef Filename, std::string *ErrorStr) {
+  assert(FileMgr);
+  auto Buffer = FileMgr->getBufferForFile(Filename, UserFilesAreVolatile);
+  if (Buffer)
+    return std::move(*Buffer);
+  if (ErrorStr)
+    *ErrorStr = Buffer.getError().message();
+  return nullptr;
+}
+
+/// Configure the diagnostics object for use with ASTUnit.
+void ASTUnit::ConfigureDiags(IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
+                             ASTUnit &AST,
+                             CaptureDiagsKind CaptureDiagnostics) {
+  assert(Diags.get() && "no DiagnosticsEngine was provided");
+  if (CaptureDiagnostics != CaptureDiagsKind::None)
+    Diags->setClient(new FilterAndStoreDiagnosticConsumer(
+        &AST.StoredDiagnostics, nullptr,
+        CaptureDiagnostics != CaptureDiagsKind::AllWithoutNonErrorsFromIncludes));
+}
+
+std::unique_ptr<ASTUnit> ASTUnit::LoadFromASTFile(
+    const std::string &Filename, const PCHContainerReader &PCHContainerRdr,
+    WhatToLoad ToLoad, IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
+    const FileSystemOptions &FileSystemOpts, bool UseDebugInfo,
+    bool OnlyLocalDecls, CaptureDiagsKind CaptureDiagnostics,
+    bool AllowASTWithCompilerErrors, bool UserFilesAreVolatile) {
+  std::unique_ptr<ASTUnit> AST(new ASTUnit(true));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
+    ASTUnitCleanup(AST.get());
+  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
+    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine>>
+    DiagCleanup(Diags.get());
+
+  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
+
+  AST->LangOpts = std::make_shared<LangOptions>();
+  AST->OnlyLocalDecls = OnlyLocalDecls;
+  AST->CaptureDiagnostics = CaptureDiagnostics;
+  AST->Diagnostics = Diags;
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
+      llvm::vfs::getRealFileSystem();
+  AST->FileMgr = new FileManager(FileSystemOpts, VFS);
+  AST->UserFilesAreVolatile = UserFilesAreVolatile;
+  AST->SourceMgr = new SourceManager(AST->getDiagnostics(),
+                                     AST->getFileManager(),
+                                     UserFilesAreVolatile);
+  AST->ModuleCache = new InMemoryModuleCache;
+  AST->HSOpts = std::make_shared<HeaderSearchOptions>();
+  AST->HSOpts->ModuleFormat = std::string(PCHContainerRdr.getFormat());
+  AST->HeaderInfo.reset(new HeaderSearch(AST->HSOpts,
+                                         AST->getSourceManager(),
+                                         AST->getDiagnostics(),
+                                         AST->getLangOpts(),
+                                         /*Target=*/nullptr));
+  AST->PPOpts = std::make_shared<PreprocessorOptions>();
+
+  // Gather Info for preprocessor construction later on.
+
+  HeaderSearch &HeaderInfo = *AST->HeaderInfo;
+  unsigned Counter;
+
+  AST->PP = std::make_shared<Preprocessor>(
+      AST->PPOpts, AST->getDiagnostics(), *AST->LangOpts,
+      AST->getSourceManager(), HeaderInfo, AST->ModuleLoader,
+      /*IILookup=*/nullptr,
+      /*OwnsHeaderSearch=*/false);
+  Preprocessor &PP = *AST->PP;
+
+  if (ToLoad >= LoadASTOnly)
+    AST->Ctx = new ASTContext(*AST->LangOpts, AST->getSourceManager(),
+                              PP.getIdentifierTable(), PP.getSelectorTable(),
+                              PP.getBuiltinInfo(),
+                              AST->getTranslationUnitKind());
+
+  DisableValidationForModuleKind disableValid =
+      DisableValidationForModuleKind::None;
+  if (::getenv("LIBCLANG_DISABLE_PCH_VALIDATION"))
+    disableValid = DisableValidationForModuleKind::All;
+  AST->Reader = new ASTReader(
+      PP, *AST->ModuleCache, AST->Ctx.get(), PCHContainerRdr, {},
+      /*isysroot=*/"",
+      /*DisableValidationKind=*/disableValid, AllowASTWithCompilerErrors);
+
+  AST->Reader->setListener(std::make_unique<ASTInfoCollector>(
+      *AST->PP, AST->Ctx.get(), *AST->HSOpts, *AST->PPOpts, *AST->LangOpts,
+      AST->TargetOpts, AST->Target, Counter));
+
+  // Attach the AST reader to the AST context as an external AST
+  // source, so that declarations will be deserialized from the
+  // AST file as needed.
+  // We need the external source to be set up before we read the AST, because
+  // eagerly-deserialized declarations may use it.
+  if (AST->Ctx)
+    AST->Ctx->setExternalSource(AST->Reader);
+
+  switch (AST->Reader->ReadAST(Filename, serialization::MK_MainFile,
+                          SourceLocation(), ASTReader::ARR_None)) {
+  case ASTReader::Success:
+    break;
+
+  case ASTReader::Failure:
+  case ASTReader::Missing:
+  case ASTReader::OutOfDate:
+  case ASTReader::VersionMismatch:
+  case ASTReader::ConfigurationMismatch:
+  case ASTReader::HadErrors:
+    AST->getDiagnostics().Report(diag::err_fe_unable_to_load_pch);
+    return nullptr;
+  }
+
+  AST->OriginalSourceFile = std::string(AST->Reader->getOriginalSourceFile());
+
+  PP.setCounterValue(Counter);
+
+  // Create an AST consumer, even though it isn't used.
+  if (ToLoad >= LoadASTOnly)
+    AST->Consumer.reset(new ASTConsumer);
+
+  // Create a semantic analysis object and tell the AST reader about it.
+  if (ToLoad >= LoadEverything) {
+    AST->TheSema.reset(new Sema(PP, *AST->Ctx, *AST->Consumer));
+    AST->TheSema->Initialize();
+    AST->Reader->InitializeSema(*AST->TheSema);
+  }
+
+  // Tell the diagnostic client that we have started a source file.
+  AST->getDiagnostics().getClient()->BeginSourceFile(PP.getLangOpts(), &PP);
+
+  return AST;
+}
+
+/// Add the given macro to the hash of all top-level entities.
+static void AddDefinedMacroToHash(const Token &MacroNameTok, unsigned &Hash) {
+  Hash = llvm::djbHash(MacroNameTok.getIdentifierInfo()->getName(), Hash);
+}
+
+namespace {
+
+/// Preprocessor callback class that updates a hash value with the names
+/// of all macros that have been defined by the translation unit.
+class MacroDefinitionTrackerPPCallbacks : public PPCallbacks {
+  unsigned &Hash;
+
+public:
+  explicit MacroDefinitionTrackerPPCallbacks(unsigned &Hash) : Hash(Hash) {}
+
+  void MacroDefined(const Token &MacroNameTok,
+                    const MacroDirective *MD) override {
+    AddDefinedMacroToHash(MacroNameTok, Hash);
+  }
+};
+
+} // namespace
+
+/// Add the given declaration to the hash of all top-level entities.
+static void AddTopLevelDeclarationToHash(Decl *D, unsigned &Hash) {
+  if (!D)
+    return;
+
+  DeclContext *DC = D->getDeclContext();
+  if (!DC)
+    return;
+
+  if (!(DC->isTranslationUnit() || DC->getLookupParent()->isTranslationUnit()))
+    return;
+
+  if (const auto *ND = dyn_cast<NamedDecl>(D)) {
+    if (const auto *EnumD = dyn_cast<EnumDecl>(D)) {
+      // For an unscoped enum include the enumerators in the hash since they
+      // enter the top-level namespace.
+      if (!EnumD->isScoped()) {
+        for (const auto *EI : EnumD->enumerators()) {
+          if (EI->getIdentifier())
+            Hash = llvm::djbHash(EI->getIdentifier()->getName(), Hash);
+        }
+      }
+    }
+
+    if (ND->getIdentifier())
+      Hash = llvm::djbHash(ND->getIdentifier()->getName(), Hash);
+    else if (DeclarationName Name = ND->getDeclName()) {
+      std::string NameStr = Name.getAsString();
+      Hash = llvm::djbHash(NameStr, Hash);
+    }
+    return;
+  }
+
+  if (const auto *ImportD = dyn_cast<ImportDecl>(D)) {
+    if (const Module *Mod = ImportD->getImportedModule()) {
+      std::string ModName = Mod->getFullModuleName();
+      Hash = llvm::djbHash(ModName, Hash);
+    }
+    return;
+  }
+}
+
+namespace {
+
+class TopLevelDeclTrackerConsumer : public ASTConsumer {
+  ASTUnit &Unit;
+  unsigned &Hash;
+
+public:
+  TopLevelDeclTrackerConsumer(ASTUnit &_Unit, unsigned &Hash)
+      : Unit(_Unit), Hash(Hash) {
+    Hash = 0;
+  }
+
+  void handleTopLevelDecl(Decl *D) {
+    if (!D)
+      return;
+
+    // FIXME: Currently ObjC method declarations are incorrectly being
+    // reported as top-level declarations, even though their DeclContext
+    // is the containing ObjC @interface/@implementation.  This is a
+    // fundamental problem in the parser right now.
+    if (isa<ObjCMethodDecl>(D))
+      return;
+
+    AddTopLevelDeclarationToHash(D, Hash);
+    Unit.addTopLevelDecl(D);
+
+    handleFileLevelDecl(D);
+  }
+
+  void handleFileLevelDecl(Decl *D) {
+    Unit.addFileLevelDecl(D);
+    if (auto *NSD = dyn_cast<NamespaceDecl>(D)) {
+      for (auto *I : NSD->decls())
+        handleFileLevelDecl(I);
+    }
+  }
+
+  bool HandleTopLevelDecl(DeclGroupRef D) override {
+    for (auto *TopLevelDecl : D)
+      handleTopLevelDecl(TopLevelDecl);
+    return true;
+  }
+
+  // We're not interested in "interesting" decls.
+  void HandleInterestingDecl(DeclGroupRef) override {}
+
+  void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
+    for (auto *TopLevelDecl : D)
+      handleTopLevelDecl(TopLevelDecl);
+  }
+
+  ASTMutationListener *GetASTMutationListener() override {
+    return Unit.getASTMutationListener();
+  }
+
+  ASTDeserializationListener *GetASTDeserializationListener() override {
+    return Unit.getDeserializationListener();
+  }
+};
+
+class TopLevelDeclTrackerAction : public ASTFrontendAction {
+public:
+  ASTUnit &Unit;
+
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef InFile) override {
+    CI.getPreprocessor().addPPCallbacks(
+        std::make_unique<MacroDefinitionTrackerPPCallbacks>(
+                                           Unit.getCurrentTopLevelHashValue()));
+    return std::make_unique<TopLevelDeclTrackerConsumer>(
+        Unit, Unit.getCurrentTopLevelHashValue());
+  }
+
+public:
+  TopLevelDeclTrackerAction(ASTUnit &_Unit) : Unit(_Unit) {}
+
+  bool hasCodeCompletionSupport() const override { return false; }
+
+  TranslationUnitKind getTranslationUnitKind() override {
+    return Unit.getTranslationUnitKind();
+  }
+};
+
+class ASTUnitPreambleCallbacks : public PreambleCallbacks {
+public:
+  unsigned getHash() const { return Hash; }
+
+  std::vector<Decl *> takeTopLevelDecls() { return std::move(TopLevelDecls); }
+
+  std::vector<serialization::DeclID> takeTopLevelDeclIDs() {
+    return std::move(TopLevelDeclIDs);
+  }
+
+  void AfterPCHEmitted(ASTWriter &Writer) override {
+    TopLevelDeclIDs.reserve(TopLevelDecls.size());
+    for (const auto *D : TopLevelDecls) {
+      // Invalid top-level decls may not have been serialized.
+      if (D->isInvalidDecl())
+        continue;
+      TopLevelDeclIDs.push_back(Writer.getDeclID(D));
+    }
+  }
+
+  void HandleTopLevelDecl(DeclGroupRef DG) override {
+    for (auto *D : DG) {
+      // FIXME: Currently ObjC method declarations are incorrectly being
+      // reported as top-level declarations, even though their DeclContext
+      // is the containing ObjC @interface/@implementation.  This is a
+      // fundamental problem in the parser right now.
+      if (isa<ObjCMethodDecl>(D))
+        continue;
+      AddTopLevelDeclarationToHash(D, Hash);
+      TopLevelDecls.push_back(D);
+    }
+  }
+
+  std::unique_ptr<PPCallbacks> createPPCallbacks() override {
+    return std::make_unique<MacroDefinitionTrackerPPCallbacks>(Hash);
+  }
+
+private:
+  unsigned Hash = 0;
+  std::vector<Decl *> TopLevelDecls;
+  std::vector<serialization::DeclID> TopLevelDeclIDs;
+  llvm::SmallVector<ASTUnit::StandaloneDiagnostic, 4> PreambleDiags;
+};
+
+} // namespace
+
+static bool isNonDriverDiag(const StoredDiagnostic &StoredDiag) {
+  return StoredDiag.getLocation().isValid();
+}
+
+static void
+checkAndRemoveNonDriverDiags(SmallVectorImpl<StoredDiagnostic> &StoredDiags) {
+  // Get rid of stored diagnostics except the ones from the driver which do not
+  // have a source location.
+  llvm::erase_if(StoredDiags, isNonDriverDiag);
+}
+
+static void checkAndSanitizeDiags(SmallVectorImpl<StoredDiagnostic> &
+                                                              StoredDiagnostics,
+                                  SourceManager &SM) {
+  // The stored diagnostic has the old source manager in it; update
+  // the locations to refer into the new source manager. Since we've
+  // been careful to make sure that the source manager's state
+  // before and after are identical, so that we can reuse the source
+  // location itself.
+  for (auto &SD : StoredDiagnostics) {
+    if (SD.getLocation().isValid()) {
+      FullSourceLoc Loc(SD.getLocation(), SM);
+      SD.setLocation(Loc);
+    }
+  }
+}
+
+/// Parse the source file into a translation unit using the given compiler
+/// invocation, replacing the current translation unit.
+///
+/// \returns True if a failure occurred that causes the ASTUnit not to
+/// contain any translation-unit information, false otherwise.
+bool ASTUnit::Parse(std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+                    std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer,
+                    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+  if (!Invocation)
+    return true;
+
+  if (VFS && FileMgr)
+    assert(VFS == &FileMgr->getVirtualFileSystem() &&
+           "VFS passed to Parse and VFS in FileMgr are different");
+
+  auto CCInvocation = std::make_shared<CompilerInvocation>(*Invocation);
+  if (OverrideMainBuffer) {
+    assert(Preamble &&
+           "No preamble was built, but OverrideMainBuffer is not null");
+    Preamble->AddImplicitPreamble(*CCInvocation, VFS, OverrideMainBuffer.get());
+    // VFS may have changed...
+  }
+
+  // Create the compiler instance to use for building the AST.
+  std::unique_ptr<CompilerInstance> Clang(
+      new CompilerInstance(std::move(PCHContainerOps)));
+
+  // Clean up on error, disengage it if the function returns successfully.
+  auto CleanOnError = llvm::make_scope_exit([&]() {
+    // Remove the overridden buffer we used for the preamble.
+    SavedMainFileBuffer = nullptr;
+
+    // Keep the ownership of the data in the ASTUnit because the client may
+    // want to see the diagnostics.
+    transferASTDataFromCompilerInstance(*Clang);
+    FailedParseDiagnostics.swap(StoredDiagnostics);
+    StoredDiagnostics.clear();
+    NumStoredDiagnosticsFromDriver = 0;
+  });
+
+  // Ensure that Clang has a FileManager with the right VFS, which may have
+  // changed above in AddImplicitPreamble.  If VFS is nullptr, rely on
+  // createFileManager to create one.
+  if (VFS && FileMgr && &FileMgr->getVirtualFileSystem() == VFS)
+    Clang->setFileManager(&*FileMgr);
+  else
+    FileMgr = Clang->createFileManager(std::move(VFS));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance>
+    CICleanup(Clang.get());
+
+  Clang->setInvocation(CCInvocation);
+  OriginalSourceFile =
+      std::string(Clang->getFrontendOpts().Inputs[0].getFile());
+
+  // Set up diagnostics, capturing any diagnostics that would
+  // otherwise be dropped.
+  Clang->setDiagnostics(&getDiagnostics());
+
+  // Create the target instance.
+  if (!Clang->createTarget())
+    return true;
+
+  assert(Clang->getFrontendOpts().Inputs.size() == 1 &&
+         "Invocation must have exactly one source file!");
+  assert(Clang->getFrontendOpts().Inputs[0].getKind().getFormat() ==
+             InputKind::Source &&
+         "FIXME: AST inputs not yet supported here!");
+  assert(Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() !=
+             Language::LLVM_IR &&
+         "IR inputs not support here!");
+
+  // Configure the various subsystems.
+  LangOpts = Clang->getInvocation().LangOpts;
+  FileSystemOpts = Clang->getFileSystemOpts();
+
+  ResetForParse();
+
+  SourceMgr = new SourceManager(getDiagnostics(), *FileMgr,
+                                UserFilesAreVolatile);
+  if (!OverrideMainBuffer) {
+    checkAndRemoveNonDriverDiags(StoredDiagnostics);
+    TopLevelDeclsInPreamble.clear();
+  }
+
+  // Create the source manager.
+  Clang->setSourceManager(&getSourceManager());
+
+  // If the main file has been overridden due to the use of a preamble,
+  // make that override happen and introduce the preamble.
+  if (OverrideMainBuffer) {
+    // The stored diagnostic has the old source manager in it; update
+    // the locations to refer into the new source manager. Since we've
+    // been careful to make sure that the source manager's state
+    // before and after are identical, so that we can reuse the source
+    // location itself.
+    checkAndSanitizeDiags(StoredDiagnostics, getSourceManager());
+
+    // Keep track of the override buffer;
+    SavedMainFileBuffer = std::move(OverrideMainBuffer);
+  }
+
+  std::unique_ptr<TopLevelDeclTrackerAction> Act(
+      new TopLevelDeclTrackerAction(*this));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<TopLevelDeclTrackerAction>
+    ActCleanup(Act.get());
+
+  if (!Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0]))
+    return true;
+
+  if (SavedMainFileBuffer)
+    TranslateStoredDiagnostics(getFileManager(), getSourceManager(),
+                               PreambleDiagnostics, StoredDiagnostics);
+  else
+    PreambleSrcLocCache.clear();
+
+  if (llvm::Error Err = Act->Execute()) {
+    consumeError(std::move(Err)); // FIXME this drops errors on the floor.
+    return true;
+  }
+
+  transferASTDataFromCompilerInstance(*Clang);
+
+  Act->EndSourceFile();
+
+  FailedParseDiagnostics.clear();
+
+  CleanOnError.release();
+
+  return false;
+}
+
+static std::pair<unsigned, unsigned>
+makeStandaloneRange(CharSourceRange Range, const SourceManager &SM,
+                    const LangOptions &LangOpts) {
+  CharSourceRange FileRange = Lexer::makeFileCharRange(Range, SM, LangOpts);
+  unsigned Offset = SM.getFileOffset(FileRange.getBegin());
+  unsigned EndOffset = SM.getFileOffset(FileRange.getEnd());
+  return std::make_pair(Offset, EndOffset);
+}
+
+static ASTUnit::StandaloneFixIt makeStandaloneFixIt(const SourceManager &SM,
+                                                    const LangOptions &LangOpts,
+                                                    const FixItHint &InFix) {
+  ASTUnit::StandaloneFixIt OutFix;
+  OutFix.RemoveRange = makeStandaloneRange(InFix.RemoveRange, SM, LangOpts);
+  OutFix.InsertFromRange = makeStandaloneRange(InFix.InsertFromRange, SM,
+                                               LangOpts);
+  OutFix.CodeToInsert = InFix.CodeToInsert;
+  OutFix.BeforePreviousInsertions = InFix.BeforePreviousInsertions;
+  return OutFix;
+}
+
+static ASTUnit::StandaloneDiagnostic
+makeStandaloneDiagnostic(const LangOptions &LangOpts,
+                         const StoredDiagnostic &InDiag) {
+  ASTUnit::StandaloneDiagnostic OutDiag;
+  OutDiag.ID = InDiag.getID();
+  OutDiag.Level = InDiag.getLevel();
+  OutDiag.Message = std::string(InDiag.getMessage());
+  OutDiag.LocOffset = 0;
+  if (InDiag.getLocation().isInvalid())
+    return OutDiag;
+  const SourceManager &SM = InDiag.getLocation().getManager();
+  SourceLocation FileLoc = SM.getFileLoc(InDiag.getLocation());
+  OutDiag.Filename = std::string(SM.getFilename(FileLoc));
+  if (OutDiag.Filename.empty())
+    return OutDiag;
+  OutDiag.LocOffset = SM.getFileOffset(FileLoc);
+  for (const auto &Range : InDiag.getRanges())
+    OutDiag.Ranges.push_back(makeStandaloneRange(Range, SM, LangOpts));
+  for (const auto &FixIt : InDiag.getFixIts())
+    OutDiag.FixIts.push_back(makeStandaloneFixIt(SM, LangOpts, FixIt));
+
+  return OutDiag;
+}
+
+/// Attempt to build or re-use a precompiled preamble when (re-)parsing
+/// the source file.
+///
+/// This routine will compute the preamble of the main source file. If a
+/// non-trivial preamble is found, it will precompile that preamble into a
+/// precompiled header so that the precompiled preamble can be used to reduce
+/// reparsing time. If a precompiled preamble has already been constructed,
+/// this routine will determine if it is still valid and, if so, avoid
+/// rebuilding the precompiled preamble.
+///
+/// \param AllowRebuild When true (the default), this routine is
+/// allowed to rebuild the precompiled preamble if it is found to be
+/// out-of-date.
+///
+/// \param MaxLines When non-zero, the maximum number of lines that
+/// can occur within the preamble.
+///
+/// \returns If the precompiled preamble can be used, returns a newly-allocated
+/// buffer that should be used in place of the main file when doing so.
+/// Otherwise, returns a NULL pointer.
+std::unique_ptr<llvm::MemoryBuffer>
+ASTUnit::getMainBufferWithPrecompiledPreamble(
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    CompilerInvocation &PreambleInvocationIn,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS, bool AllowRebuild,
+    unsigned MaxLines) {
+  auto MainFilePath =
+      PreambleInvocationIn.getFrontendOpts().Inputs[0].getFile();
+  std::unique_ptr<llvm::MemoryBuffer> MainFileBuffer =
+      getBufferForFileHandlingRemapping(PreambleInvocationIn, VFS.get(),
+                                        MainFilePath, UserFilesAreVolatile);
+  if (!MainFileBuffer)
+    return nullptr;
+
+  PreambleBounds Bounds = ComputePreambleBounds(
+      *PreambleInvocationIn.getLangOpts(), *MainFileBuffer, MaxLines);
+  if (!Bounds.Size)
+    return nullptr;
+
+  if (Preamble) {
+    if (Preamble->CanReuse(PreambleInvocationIn, *MainFileBuffer, Bounds,
+                           *VFS)) {
+      // Okay! We can re-use the precompiled preamble.
+
+      // Set the state of the diagnostic object to mimic its state
+      // after parsing the preamble.
+      getDiagnostics().Reset();
+      ProcessWarningOptions(getDiagnostics(),
+                            PreambleInvocationIn.getDiagnosticOpts());
+      getDiagnostics().setNumWarnings(NumWarningsInPreamble);
+
+      PreambleRebuildCountdown = 1;
+      return MainFileBuffer;
+    } else {
+      Preamble.reset();
+      PreambleDiagnostics.clear();
+      TopLevelDeclsInPreamble.clear();
+      PreambleSrcLocCache.clear();
+      PreambleRebuildCountdown = 1;
+    }
+  }
+
+  // If the preamble rebuild counter > 1, it's because we previously
+  // failed to build a preamble and we're not yet ready to try
+  // again. Decrement the counter and return a failure.
+  if (PreambleRebuildCountdown > 1) {
+    --PreambleRebuildCountdown;
+    return nullptr;
+  }
+
+  assert(!Preamble && "No Preamble should be stored at that point");
+  // If we aren't allowed to rebuild the precompiled preamble, just
+  // return now.
+  if (!AllowRebuild)
+    return nullptr;
+
+  ++PreambleCounter;
+
+  SmallVector<StandaloneDiagnostic, 4> NewPreambleDiagsStandalone;
+  SmallVector<StoredDiagnostic, 4> NewPreambleDiags;
+  ASTUnitPreambleCallbacks Callbacks;
+  {
+    llvm::Optional<CaptureDroppedDiagnostics> Capture;
+    if (CaptureDiagnostics != CaptureDiagsKind::None)
+      Capture.emplace(CaptureDiagnostics, *Diagnostics, &NewPreambleDiags,
+                      &NewPreambleDiagsStandalone);
+
+    // We did not previously compute a preamble, or it can't be reused anyway.
+    SimpleTimer PreambleTimer(WantTiming);
+    PreambleTimer.setOutput("Precompiling preamble");
+
+    const bool PreviousSkipFunctionBodies =
+        PreambleInvocationIn.getFrontendOpts().SkipFunctionBodies;
+    if (SkipFunctionBodies == SkipFunctionBodiesScope::Preamble)
+      PreambleInvocationIn.getFrontendOpts().SkipFunctionBodies = true;
+
+    llvm::ErrorOr<PrecompiledPreamble> NewPreamble = PrecompiledPreamble::Build(
+        PreambleInvocationIn, MainFileBuffer.get(), Bounds, *Diagnostics, VFS,
+        PCHContainerOps, /*StoreInMemory=*/false, Callbacks);
+
+    PreambleInvocationIn.getFrontendOpts().SkipFunctionBodies =
+        PreviousSkipFunctionBodies;
+
+    if (NewPreamble) {
+      Preamble = std::move(*NewPreamble);
+      PreambleRebuildCountdown = 1;
+    } else {
+      switch (static_cast<BuildPreambleError>(NewPreamble.getError().value())) {
+      case BuildPreambleError::CouldntCreateTempFile:
+        // Try again next time.
+        PreambleRebuildCountdown = 1;
+        return nullptr;
+      case BuildPreambleError::CouldntCreateTargetInfo:
+      case BuildPreambleError::BeginSourceFileFailed:
+      case BuildPreambleError::CouldntEmitPCH:
+      case BuildPreambleError::BadInputs:
+        // These erros are more likely to repeat, retry after some period.
+        PreambleRebuildCountdown = DefaultPreambleRebuildInterval;
+        return nullptr;
+      }
+      llvm_unreachable("unexpected BuildPreambleError");
+    }
+  }
+
+  assert(Preamble && "Preamble wasn't built");
+
+  TopLevelDecls.clear();
+  TopLevelDeclsInPreamble = Callbacks.takeTopLevelDeclIDs();
+  PreambleTopLevelHashValue = Callbacks.getHash();
+
+  NumWarningsInPreamble = getDiagnostics().getNumWarnings();
+
+  checkAndRemoveNonDriverDiags(NewPreambleDiags);
+  StoredDiagnostics = std::move(NewPreambleDiags);
+  PreambleDiagnostics = std::move(NewPreambleDiagsStandalone);
+
+  // If the hash of top-level entities differs from the hash of the top-level
+  // entities the last time we rebuilt the preamble, clear out the completion
+  // cache.
+  if (CurrentTopLevelHashValue != PreambleTopLevelHashValue) {
+    CompletionCacheTopLevelHashValue = 0;
+    PreambleTopLevelHashValue = CurrentTopLevelHashValue;
+  }
+
+  return MainFileBuffer;
+}
+
+void ASTUnit::RealizeTopLevelDeclsFromPreamble() {
+  assert(Preamble && "Should only be called when preamble was built");
+
+  std::vector<Decl *> Resolved;
+  Resolved.reserve(TopLevelDeclsInPreamble.size());
+  ExternalASTSource &Source = *getASTContext().getExternalSource();
+  for (const auto TopLevelDecl : TopLevelDeclsInPreamble) {
+    // Resolve the declaration ID to an actual declaration, possibly
+    // deserializing the declaration in the process.
+    if (Decl *D = Source.GetExternalDecl(TopLevelDecl))
+      Resolved.push_back(D);
+  }
+  TopLevelDeclsInPreamble.clear();
+  TopLevelDecls.insert(TopLevelDecls.begin(), Resolved.begin(), Resolved.end());
+}
+
+void ASTUnit::transferASTDataFromCompilerInstance(CompilerInstance &CI) {
+  // Steal the created target, context, and preprocessor if they have been
+  // created.
+  assert(CI.hasInvocation() && "missing invocation");
+  LangOpts = CI.getInvocation().LangOpts;
+  TheSema = CI.takeSema();
+  Consumer = CI.takeASTConsumer();
+  if (CI.hasASTContext())
+    Ctx = &CI.getASTContext();
+  if (CI.hasPreprocessor())
+    PP = CI.getPreprocessorPtr();
+  CI.setSourceManager(nullptr);
+  CI.setFileManager(nullptr);
+  if (CI.hasTarget())
+    Target = &CI.getTarget();
+  Reader = CI.getASTReader();
+  HadModuleLoaderFatalFailure = CI.hadModuleLoaderFatalFailure();
+}
+
+StringRef ASTUnit::getMainFileName() const {
+  if (Invocation && !Invocation->getFrontendOpts().Inputs.empty()) {
+    const FrontendInputFile &Input = Invocation->getFrontendOpts().Inputs[0];
+    if (Input.isFile())
+      return Input.getFile();
+    else
+      return Input.getBuffer().getBufferIdentifier();
+  }
+
+  if (SourceMgr) {
+    if (const FileEntry *
+          FE = SourceMgr->getFileEntryForID(SourceMgr->getMainFileID()))
+      return FE->getName();
+  }
+
+  return {};
+}
+
+StringRef ASTUnit::getASTFileName() const {
+  if (!isMainFileAST())
+    return {};
+
+  serialization::ModuleFile &
+    Mod = Reader->getModuleManager().getPrimaryModule();
+  return Mod.FileName;
+}
+
+std::unique_ptr<ASTUnit>
+ASTUnit::create(std::shared_ptr<CompilerInvocation> CI,
+                IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
+                CaptureDiagsKind CaptureDiagnostics,
+                bool UserFilesAreVolatile) {
+  std::unique_ptr<ASTUnit> AST(new ASTUnit(false));
+  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
+      createVFSFromCompilerInvocation(*CI, *Diags);
+  AST->Diagnostics = Diags;
+  AST->FileSystemOpts = CI->getFileSystemOpts();
+  AST->Invocation = std::move(CI);
+  AST->FileMgr = new FileManager(AST->FileSystemOpts, VFS);
+  AST->UserFilesAreVolatile = UserFilesAreVolatile;
+  AST->SourceMgr = new SourceManager(AST->getDiagnostics(), *AST->FileMgr,
+                                     UserFilesAreVolatile);
+  AST->ModuleCache = new InMemoryModuleCache;
+
+  return AST;
+}
+
+ASTUnit *ASTUnit::LoadFromCompilerInvocationAction(
+    std::shared_ptr<CompilerInvocation> CI,
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags, FrontendAction *Action,
+    ASTUnit *Unit, bool Persistent, StringRef ResourceFilesPath,
+    bool OnlyLocalDecls, CaptureDiagsKind CaptureDiagnostics,
+    unsigned PrecompilePreambleAfterNParses, bool CacheCodeCompletionResults,
+    bool UserFilesAreVolatile, std::unique_ptr<ASTUnit> *ErrAST) {
+  assert(CI && "A CompilerInvocation is required");
+
+  std::unique_ptr<ASTUnit> OwnAST;
+  ASTUnit *AST = Unit;
+  if (!AST) {
+    // Create the AST unit.
+    OwnAST = create(CI, Diags, CaptureDiagnostics, UserFilesAreVolatile);
+    AST = OwnAST.get();
+    if (!AST)
+      return nullptr;
+  }
+
+  if (!ResourceFilesPath.empty()) {
+    // Override the resources path.
+    CI->getHeaderSearchOpts().ResourceDir = std::string(ResourceFilesPath);
+  }
+  AST->OnlyLocalDecls = OnlyLocalDecls;
+  AST->CaptureDiagnostics = CaptureDiagnostics;
+  if (PrecompilePreambleAfterNParses > 0)
+    AST->PreambleRebuildCountdown = PrecompilePreambleAfterNParses;
+  AST->TUKind = Action ? Action->getTranslationUnitKind() : TU_Complete;
+  AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
+  AST->IncludeBriefCommentsInCodeCompletion = false;
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
+    ASTUnitCleanup(OwnAST.get());
+  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
+    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine>>
+    DiagCleanup(Diags.get());
+
+  // We'll manage file buffers ourselves.
+  CI->getPreprocessorOpts().RetainRemappedFileBuffers = true;
+  CI->getFrontendOpts().DisableFree = false;
+  ProcessWarningOptions(AST->getDiagnostics(), CI->getDiagnosticOpts());
+
+  // Create the compiler instance to use for building the AST.
+  std::unique_ptr<CompilerInstance> Clang(
+      new CompilerInstance(std::move(PCHContainerOps)));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance>
+    CICleanup(Clang.get());
+
+  Clang->setInvocation(std::move(CI));
+  AST->OriginalSourceFile =
+      std::string(Clang->getFrontendOpts().Inputs[0].getFile());
+
+  // Set up diagnostics, capturing any diagnostics that would
+  // otherwise be dropped.
+  Clang->setDiagnostics(&AST->getDiagnostics());
+
+  // Create the target instance.
+  if (!Clang->createTarget())
+    return nullptr;
+
+  assert(Clang->getFrontendOpts().Inputs.size() == 1 &&
+         "Invocation must have exactly one source file!");
+  assert(Clang->getFrontendOpts().Inputs[0].getKind().getFormat() ==
+             InputKind::Source &&
+         "FIXME: AST inputs not yet supported here!");
+  assert(Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() !=
+             Language::LLVM_IR &&
+         "IR inputs not support here!");
+
+  // Configure the various subsystems.
+  AST->TheSema.reset();
+  AST->Ctx = nullptr;
+  AST->PP = nullptr;
+  AST->Reader = nullptr;
+
+  // Create a file manager object to provide access to and cache the filesystem.
+  Clang->setFileManager(&AST->getFileManager());
+
+  // Create the source manager.
+  Clang->setSourceManager(&AST->getSourceManager());
+
+  FrontendAction *Act = Action;
+
+  std::unique_ptr<TopLevelDeclTrackerAction> TrackerAct;
+  if (!Act) {
+    TrackerAct.reset(new TopLevelDeclTrackerAction(*AST));
+    Act = TrackerAct.get();
+  }
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<TopLevelDeclTrackerAction>
+    ActCleanup(TrackerAct.get());
+
+  if (!Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0])) {
+    AST->transferASTDataFromCompilerInstance(*Clang);
+    if (OwnAST && ErrAST)
+      ErrAST->swap(OwnAST);
+
+    return nullptr;
+  }
+
+  if (Persistent && !TrackerAct) {
+    Clang->getPreprocessor().addPPCallbacks(
+        std::make_unique<MacroDefinitionTrackerPPCallbacks>(
+                                           AST->getCurrentTopLevelHashValue()));
+    std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+    if (Clang->hasASTConsumer())
+      Consumers.push_back(Clang->takeASTConsumer());
+    Consumers.push_back(std::make_unique<TopLevelDeclTrackerConsumer>(
+        *AST, AST->getCurrentTopLevelHashValue()));
+    Clang->setASTConsumer(
+        std::make_unique<MultiplexConsumer>(std::move(Consumers)));
+  }
+  if (llvm::Error Err = Act->Execute()) {
+    consumeError(std::move(Err)); // FIXME this drops errors on the floor.
+    AST->transferASTDataFromCompilerInstance(*Clang);
+    if (OwnAST && ErrAST)
+      ErrAST->swap(OwnAST);
+
+    return nullptr;
+  }
+
+  // Steal the created target, context, and preprocessor.
+  AST->transferASTDataFromCompilerInstance(*Clang);
+
+  Act->EndSourceFile();
+
+  if (OwnAST)
+    return OwnAST.release();
+  else
+    return AST;
+}
+
+bool ASTUnit::LoadFromCompilerInvocation(
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    unsigned PrecompilePreambleAfterNParses,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+  if (!Invocation)
+    return true;
+
+  assert(VFS && "VFS is null");
+
+  // We'll manage file buffers ourselves.
+  Invocation->getPreprocessorOpts().RetainRemappedFileBuffers = true;
+  Invocation->getFrontendOpts().DisableFree = false;
+  getDiagnostics().Reset();
+  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
+
+  std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
+  if (PrecompilePreambleAfterNParses > 0) {
+    PreambleRebuildCountdown = PrecompilePreambleAfterNParses;
+    OverrideMainBuffer =
+        getMainBufferWithPrecompiledPreamble(PCHContainerOps, *Invocation, VFS);
+    getDiagnostics().Reset();
+    ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
+  }
+
+  SimpleTimer ParsingTimer(WantTiming);
+  ParsingTimer.setOutput("Parsing " + getMainFileName());
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<llvm::MemoryBuffer>
+    MemBufferCleanup(OverrideMainBuffer.get());
+
+  return Parse(std::move(PCHContainerOps), std::move(OverrideMainBuffer), VFS);
+}
+
+std::unique_ptr<ASTUnit> ASTUnit::LoadFromCompilerInvocation(
+    std::shared_ptr<CompilerInvocation> CI,
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags, FileManager *FileMgr,
+    bool OnlyLocalDecls, CaptureDiagsKind CaptureDiagnostics,
+    unsigned PrecompilePreambleAfterNParses, TranslationUnitKind TUKind,
+    bool CacheCodeCompletionResults, bool IncludeBriefCommentsInCodeCompletion,
+    bool UserFilesAreVolatile) {
+  // Create the AST unit.
+  std::unique_ptr<ASTUnit> AST(new ASTUnit(false));
+  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
+  AST->Diagnostics = Diags;
+  AST->OnlyLocalDecls = OnlyLocalDecls;
+  AST->CaptureDiagnostics = CaptureDiagnostics;
+  AST->TUKind = TUKind;
+  AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
+  AST->IncludeBriefCommentsInCodeCompletion
+    = IncludeBriefCommentsInCodeCompletion;
+  AST->Invocation = std::move(CI);
+  AST->FileSystemOpts = FileMgr->getFileSystemOpts();
+  AST->FileMgr = FileMgr;
+  AST->UserFilesAreVolatile = UserFilesAreVolatile;
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
+    ASTUnitCleanup(AST.get());
+  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
+    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine>>
+    DiagCleanup(Diags.get());
+
+  if (AST->LoadFromCompilerInvocation(std::move(PCHContainerOps),
+                                      PrecompilePreambleAfterNParses,
+                                      &AST->FileMgr->getVirtualFileSystem()))
+    return nullptr;
+  return AST;
+}
+
+ASTUnit *ASTUnit::LoadFromCommandLine(
+    const char **ArgBegin, const char **ArgEnd,
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags, StringRef ResourceFilesPath,
+    bool OnlyLocalDecls, CaptureDiagsKind CaptureDiagnostics,
+    ArrayRef<RemappedFile> RemappedFiles, bool RemappedFilesKeepOriginalName,
+    unsigned PrecompilePreambleAfterNParses, TranslationUnitKind TUKind,
+    bool CacheCodeCompletionResults, bool IncludeBriefCommentsInCodeCompletion,
+    bool AllowPCHWithCompilerErrors, SkipFunctionBodiesScope SkipFunctionBodies,
+    bool SingleFileParse, bool UserFilesAreVolatile, bool ForSerialization,
+    bool RetainExcludedConditionalBlocks,
+    llvm::Optional<StringRef> ModuleFormat, std::unique_ptr<ASTUnit> *ErrAST,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+  assert(Diags.get() && "no DiagnosticsEngine was provided");
+
+  SmallVector<StoredDiagnostic, 4> StoredDiagnostics;
+
+  std::shared_ptr<CompilerInvocation> CI;
+
+  {
+    CaptureDroppedDiagnostics Capture(CaptureDiagnostics, *Diags,
+                                      &StoredDiagnostics, nullptr);
+
+    CI = createInvocationFromCommandLine(
+        llvm::makeArrayRef(ArgBegin, ArgEnd), Diags, VFS);
+    if (!CI)
+      return nullptr;
+  }
+
+  // Override any files that need remapping
+  for (const auto &RemappedFile : RemappedFiles) {
+    CI->getPreprocessorOpts().addRemappedFile(RemappedFile.first,
+                                              RemappedFile.second);
+  }
+  PreprocessorOptions &PPOpts = CI->getPreprocessorOpts();
+  PPOpts.RemappedFilesKeepOriginalName = RemappedFilesKeepOriginalName;
+  PPOpts.AllowPCHWithCompilerErrors = AllowPCHWithCompilerErrors;
+  PPOpts.SingleFileParseMode = SingleFileParse;
+  PPOpts.RetainExcludedConditionalBlocks = RetainExcludedConditionalBlocks;
+
+  // Override the resources path.
+  CI->getHeaderSearchOpts().ResourceDir = std::string(ResourceFilesPath);
+
+  CI->getFrontendOpts().SkipFunctionBodies =
+      SkipFunctionBodies == SkipFunctionBodiesScope::PreambleAndMainFile;
+
+  if (ModuleFormat)
+    CI->getHeaderSearchOpts().ModuleFormat =
+        std::string(ModuleFormat.getValue());
+
+  // Create the AST unit.
+  std::unique_ptr<ASTUnit> AST;
+  AST.reset(new ASTUnit(false));
+  AST->NumStoredDiagnosticsFromDriver = StoredDiagnostics.size();
+  AST->StoredDiagnostics.swap(StoredDiagnostics);
+  ConfigureDiags(Diags, *AST, CaptureDiagnostics);
+  AST->Diagnostics = Diags;
+  AST->FileSystemOpts = CI->getFileSystemOpts();
+  if (!VFS)
+    VFS = llvm::vfs::getRealFileSystem();
+  VFS = createVFSFromCompilerInvocation(*CI, *Diags, VFS);
+  AST->FileMgr = new FileManager(AST->FileSystemOpts, VFS);
+  AST->ModuleCache = new InMemoryModuleCache;
+  AST->OnlyLocalDecls = OnlyLocalDecls;
+  AST->CaptureDiagnostics = CaptureDiagnostics;
+  AST->TUKind = TUKind;
+  AST->ShouldCacheCodeCompletionResults = CacheCodeCompletionResults;
+  AST->IncludeBriefCommentsInCodeCompletion
+    = IncludeBriefCommentsInCodeCompletion;
+  AST->UserFilesAreVolatile = UserFilesAreVolatile;
+  AST->Invocation = CI;
+  AST->SkipFunctionBodies = SkipFunctionBodies;
+  if (ForSerialization)
+    AST->WriterData.reset(new ASTWriterData(*AST->ModuleCache));
+  // Zero out now to ease cleanup during crash recovery.
+  CI = nullptr;
+  Diags = nullptr;
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<ASTUnit>
+    ASTUnitCleanup(AST.get());
+
+  if (AST->LoadFromCompilerInvocation(std::move(PCHContainerOps),
+                                      PrecompilePreambleAfterNParses,
+                                      VFS)) {
+    // Some error occurred, if caller wants to examine diagnostics, pass it the
+    // ASTUnit.
+    if (ErrAST) {
+      AST->StoredDiagnostics.swap(AST->FailedParseDiagnostics);
+      ErrAST->swap(AST);
+    }
+    return nullptr;
+  }
+
+  return AST.release();
+}
+
+bool ASTUnit::Reparse(std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+                      ArrayRef<RemappedFile> RemappedFiles,
+                      IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+  if (!Invocation)
+    return true;
+
+  if (!VFS) {
+    assert(FileMgr && "FileMgr is null on Reparse call");
+    VFS = &FileMgr->getVirtualFileSystem();
+  }
+
+  clearFileLevelDecls();
+
+  SimpleTimer ParsingTimer(WantTiming);
+  ParsingTimer.setOutput("Reparsing " + getMainFileName());
+
+  // Remap files.
+  PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
+  for (const auto &RB : PPOpts.RemappedFileBuffers)
+    delete RB.second;
+
+  Invocation->getPreprocessorOpts().clearRemappedFiles();
+  for (const auto &RemappedFile : RemappedFiles) {
+    Invocation->getPreprocessorOpts().addRemappedFile(RemappedFile.first,
+                                                      RemappedFile.second);
+  }
+
+  // If we have a preamble file lying around, or if we might try to
+  // build a precompiled preamble, do so now.
+  std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
+  if (Preamble || PreambleRebuildCountdown > 0)
+    OverrideMainBuffer =
+        getMainBufferWithPrecompiledPreamble(PCHContainerOps, *Invocation, VFS);
+
+  // Clear out the diagnostics state.
+  FileMgr.reset();
+  getDiagnostics().Reset();
+  ProcessWarningOptions(getDiagnostics(), Invocation->getDiagnosticOpts());
+  if (OverrideMainBuffer)
+    getDiagnostics().setNumWarnings(NumWarningsInPreamble);
+
+  // Parse the sources
+  bool Result =
+      Parse(std::move(PCHContainerOps), std::move(OverrideMainBuffer), VFS);
+
+  // If we're caching global code-completion results, and the top-level
+  // declarations have changed, clear out the code-completion cache.
+  if (!Result && ShouldCacheCodeCompletionResults &&
+      CurrentTopLevelHashValue != CompletionCacheTopLevelHashValue)
+    CacheCodeCompletionResults();
+
+  // We now need to clear out the completion info related to this translation
+  // unit; it'll be recreated if necessary.
+  CCTUInfo.reset();
+
+  return Result;
+}
+
+void ASTUnit::ResetForParse() {
+  SavedMainFileBuffer.reset();
+
+  SourceMgr.reset();
+  TheSema.reset();
+  Ctx.reset();
+  PP.reset();
+  Reader.reset();
+
+  TopLevelDecls.clear();
+  clearFileLevelDecls();
+}
+
+//----------------------------------------------------------------------------//
+// Code completion
+//----------------------------------------------------------------------------//
+
+namespace {
+
+  /// Code completion consumer that combines the cached code-completion
+  /// results from an ASTUnit with the code-completion results provided to it,
+  /// then passes the result on to
+  class AugmentedCodeCompleteConsumer : public CodeCompleteConsumer {
+    uint64_t NormalContexts;
+    ASTUnit &AST;
+    CodeCompleteConsumer &Next;
+
+  public:
+    AugmentedCodeCompleteConsumer(ASTUnit &AST, CodeCompleteConsumer &Next,
+                                  const CodeCompleteOptions &CodeCompleteOpts)
+        : CodeCompleteConsumer(CodeCompleteOpts), AST(AST), Next(Next) {
+      // Compute the set of contexts in which we will look when we don't have
+      // any information about the specific context.
+      NormalContexts
+        = (1LL << CodeCompletionContext::CCC_TopLevel)
+        | (1LL << CodeCompletionContext::CCC_ObjCInterface)
+        | (1LL << CodeCompletionContext::CCC_ObjCImplementation)
+        | (1LL << CodeCompletionContext::CCC_ObjCIvarList)
+        | (1LL << CodeCompletionContext::CCC_Statement)
+        | (1LL << CodeCompletionContext::CCC_Expression)
+        | (1LL << CodeCompletionContext::CCC_ObjCMessageReceiver)
+        | (1LL << CodeCompletionContext::CCC_DotMemberAccess)
+        | (1LL << CodeCompletionContext::CCC_ArrowMemberAccess)
+        | (1LL << CodeCompletionContext::CCC_ObjCPropertyAccess)
+        | (1LL << CodeCompletionContext::CCC_ObjCProtocolName)
+        | (1LL << CodeCompletionContext::CCC_ParenthesizedExpression)
+        | (1LL << CodeCompletionContext::CCC_Recovery);
+
+      if (AST.getASTContext().getLangOpts().CPlusPlus)
+        NormalContexts |= (1LL << CodeCompletionContext::CCC_EnumTag)
+                       |  (1LL << CodeCompletionContext::CCC_UnionTag)
+                       |  (1LL << CodeCompletionContext::CCC_ClassOrStructTag);
+    }
+
+    void ProcessCodeCompleteResults(Sema &S, CodeCompletionContext Context,
+                                    CodeCompletionResult *Results,
+                                    unsigned NumResults) override;
+
+    void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
+                                   OverloadCandidate *Candidates,
+                                   unsigned NumCandidates,
+                                   SourceLocation OpenParLoc,
+                                   bool Braced) override {
+      Next.ProcessOverloadCandidates(S, CurrentArg, Candidates, NumCandidates,
+                                     OpenParLoc, Braced);
+    }
+
+    CodeCompletionAllocator &getAllocator() override {
+      return Next.getAllocator();
+    }
+
+    CodeCompletionTUInfo &getCodeCompletionTUInfo() override {
+      return Next.getCodeCompletionTUInfo();
+    }
+  };
+
+} // namespace
+
+/// Helper function that computes which global names are hidden by the
+/// local code-completion results.
+static void CalculateHiddenNames(const CodeCompletionContext &Context,
+                                 CodeCompletionResult *Results,
+                                 unsigned NumResults,
+                                 ASTContext &Ctx,
+                          llvm::StringSet<llvm::BumpPtrAllocator> &HiddenNames){
+  bool OnlyTagNames = false;
+  switch (Context.getKind()) {
+  case CodeCompletionContext::CCC_Recovery:
+  case CodeCompletionContext::CCC_TopLevel:
+  case CodeCompletionContext::CCC_ObjCInterface:
+  case CodeCompletionContext::CCC_ObjCImplementation:
+  case CodeCompletionContext::CCC_ObjCIvarList:
+  case CodeCompletionContext::CCC_ClassStructUnion:
+  case CodeCompletionContext::CCC_Statement:
+  case CodeCompletionContext::CCC_Expression:
+  case CodeCompletionContext::CCC_ObjCMessageReceiver:
+  case CodeCompletionContext::CCC_DotMemberAccess:
+  case CodeCompletionContext::CCC_ArrowMemberAccess:
+  case CodeCompletionContext::CCC_ObjCPropertyAccess:
+  case CodeCompletionContext::CCC_Namespace:
+  case CodeCompletionContext::CCC_Type:
+  case CodeCompletionContext::CCC_Symbol:
+  case CodeCompletionContext::CCC_SymbolOrNewName:
+  case CodeCompletionContext::CCC_ParenthesizedExpression:
+  case CodeCompletionContext::CCC_ObjCInterfaceName:
+    break;
+
+  case CodeCompletionContext::CCC_EnumTag:
+  case CodeCompletionContext::CCC_UnionTag:
+  case CodeCompletionContext::CCC_ClassOrStructTag:
+    OnlyTagNames = true;
+    break;
+
+  case CodeCompletionContext::CCC_ObjCProtocolName:
+  case CodeCompletionContext::CCC_MacroName:
+  case CodeCompletionContext::CCC_MacroNameUse:
+  case CodeCompletionContext::CCC_PreprocessorExpression:
+  case CodeCompletionContext::CCC_PreprocessorDirective:
+  case CodeCompletionContext::CCC_NaturalLanguage:
+  case CodeCompletionContext::CCC_SelectorName:
+  case CodeCompletionContext::CCC_TypeQualifiers:
+  case CodeCompletionContext::CCC_Other:
+  case CodeCompletionContext::CCC_OtherWithMacros:
+  case CodeCompletionContext::CCC_ObjCInstanceMessage:
+  case CodeCompletionContext::CCC_ObjCClassMessage:
+  case CodeCompletionContext::CCC_ObjCCategoryName:
+  case CodeCompletionContext::CCC_IncludedFile:
+  case CodeCompletionContext::CCC_Attribute:
+  case CodeCompletionContext::CCC_NewName:
+    // We're looking for nothing, or we're looking for names that cannot
+    // be hidden.
+    return;
+  }
+
+  using Result = CodeCompletionResult;
+  for (unsigned I = 0; I != NumResults; ++I) {
+    if (Results[I].Kind != Result::RK_Declaration)
+      continue;
+
+    unsigned IDNS
+      = Results[I].Declaration->getUnderlyingDecl()->getIdentifierNamespace();
+
+    bool Hiding = false;
+    if (OnlyTagNames)
+      Hiding = (IDNS & Decl::IDNS_Tag);
+    else {
+      unsigned HiddenIDNS = (Decl::IDNS_Type | Decl::IDNS_Member |
+                             Decl::IDNS_Namespace | Decl::IDNS_Ordinary |
+                             Decl::IDNS_NonMemberOperator);
+      if (Ctx.getLangOpts().CPlusPlus)
+        HiddenIDNS |= Decl::IDNS_Tag;
+      Hiding = (IDNS & HiddenIDNS);
+    }
+
+    if (!Hiding)
+      continue;
+
+    DeclarationName Name = Results[I].Declaration->getDeclName();
+    if (IdentifierInfo *Identifier = Name.getAsIdentifierInfo())
+      HiddenNames.insert(Identifier->getName());
+    else
+      HiddenNames.insert(Name.getAsString());
+  }
+}
+
+void AugmentedCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &S,
+                                            CodeCompletionContext Context,
+                                            CodeCompletionResult *Results,
+                                            unsigned NumResults) {
+  // Merge the results we were given with the results we cached.
+  bool AddedResult = false;
+  uint64_t InContexts =
+      Context.getKind() == CodeCompletionContext::CCC_Recovery
+        ? NormalContexts : (1LL << Context.getKind());
+  // Contains the set of names that are hidden by "local" completion results.
+  llvm::StringSet<llvm::BumpPtrAllocator> HiddenNames;
+  using Result = CodeCompletionResult;
+  SmallVector<Result, 8> AllResults;
+  for (ASTUnit::cached_completion_iterator
+            C = AST.cached_completion_begin(),
+         CEnd = AST.cached_completion_end();
+       C != CEnd; ++C) {
+    // If the context we are in matches any of the contexts we are
+    // interested in, we'll add this result.
+    if ((C->ShowInContexts & InContexts) == 0)
+      continue;
+
+    // If we haven't added any results previously, do so now.
+    if (!AddedResult) {
+      CalculateHiddenNames(Context, Results, NumResults, S.Context,
+                           HiddenNames);
+      AllResults.insert(AllResults.end(), Results, Results + NumResults);
+      AddedResult = true;
+    }
+
+    // Determine whether this global completion result is hidden by a local
+    // completion result. If so, skip it.
+    if (C->Kind != CXCursor_MacroDefinition &&
+        HiddenNames.count(C->Completion->getTypedText()))
+      continue;
+
+    // Adjust priority based on similar type classes.
+    unsigned Priority = C->Priority;
+    CodeCompletionString *Completion = C->Completion;
+    if (!Context.getPreferredType().isNull()) {
+      if (C->Kind == CXCursor_MacroDefinition) {
+        Priority = getMacroUsagePriority(C->Completion->getTypedText(),
+                                         S.getLangOpts(),
+                               Context.getPreferredType()->isAnyPointerType());
+      } else if (C->Type) {
+        CanQualType Expected
+          = S.Context.getCanonicalType(
+                               Context.getPreferredType().getUnqualifiedType());
+        SimplifiedTypeClass ExpectedSTC = getSimplifiedTypeClass(Expected);
+        if (ExpectedSTC == C->TypeClass) {
+          // We know this type is similar; check for an exact match.
+          llvm::StringMap<unsigned> &CachedCompletionTypes
+            = AST.getCachedCompletionTypes();
+          llvm::StringMap<unsigned>::iterator Pos
+            = CachedCompletionTypes.find(QualType(Expected).getAsString());
+          if (Pos != CachedCompletionTypes.end() && Pos->second == C->Type)
+            Priority /= CCF_ExactTypeMatch;
+          else
+            Priority /= CCF_SimilarTypeMatch;
+        }
+      }
+    }
+
+    // Adjust the completion string, if required.
+    if (C->Kind == CXCursor_MacroDefinition &&
+        Context.getKind() == CodeCompletionContext::CCC_MacroNameUse) {
+      // Create a new code-completion string that just contains the
+      // macro name, without its arguments.
+      CodeCompletionBuilder Builder(getAllocator(), getCodeCompletionTUInfo(),
+                                    CCP_CodePattern, C->Availability);
+      Builder.AddTypedTextChunk(C->Completion->getTypedText());
+      Priority = CCP_CodePattern;
+      Completion = Builder.TakeString();
+    }
+
+    AllResults.push_back(Result(Completion, Priority, C->Kind,
+                                C->Availability));
+  }
+
+  // If we did not add any cached completion results, just forward the
+  // results we were given to the next consumer.
+  if (!AddedResult) {
+    Next.ProcessCodeCompleteResults(S, Context, Results, NumResults);
+    return;
+  }
+
+  Next.ProcessCodeCompleteResults(S, Context, AllResults.data(),
+                                  AllResults.size());
+}
+
+void ASTUnit::CodeComplete(
+    StringRef File, unsigned Line, unsigned Column,
+    ArrayRef<RemappedFile> RemappedFiles, bool IncludeMacros,
+    bool IncludeCodePatterns, bool IncludeBriefComments,
+    CodeCompleteConsumer &Consumer,
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    DiagnosticsEngine &Diag, LangOptions &LangOpts, SourceManager &SourceMgr,
+    FileManager &FileMgr, SmallVectorImpl<StoredDiagnostic> &StoredDiagnostics,
+    SmallVectorImpl<const llvm::MemoryBuffer *> &OwnedBuffers) {
+  if (!Invocation)
+    return;
+
+  SimpleTimer CompletionTimer(WantTiming);
+  CompletionTimer.setOutput("Code completion @ " + File + ":" +
+                            Twine(Line) + ":" + Twine(Column));
+
+  auto CCInvocation = std::make_shared<CompilerInvocation>(*Invocation);
+
+  FrontendOptions &FrontendOpts = CCInvocation->getFrontendOpts();
+  CodeCompleteOptions &CodeCompleteOpts = FrontendOpts.CodeCompleteOpts;
+  PreprocessorOptions &PreprocessorOpts = CCInvocation->getPreprocessorOpts();
+
+  CodeCompleteOpts.IncludeMacros = IncludeMacros &&
+                                   CachedCompletionResults.empty();
+  CodeCompleteOpts.IncludeCodePatterns = IncludeCodePatterns;
+  CodeCompleteOpts.IncludeGlobals = CachedCompletionResults.empty();
+  CodeCompleteOpts.IncludeBriefComments = IncludeBriefComments;
+  CodeCompleteOpts.LoadExternal = Consumer.loadExternal();
+  CodeCompleteOpts.IncludeFixIts = Consumer.includeFixIts();
+
+  assert(IncludeBriefComments == this->IncludeBriefCommentsInCodeCompletion);
+
+  FrontendOpts.CodeCompletionAt.FileName = std::string(File);
+  FrontendOpts.CodeCompletionAt.Line = Line;
+  FrontendOpts.CodeCompletionAt.Column = Column;
+
+  // Set the language options appropriately.
+  LangOpts = *CCInvocation->getLangOpts();
+
+  // Spell-checking and warnings are wasteful during code-completion.
+  LangOpts.SpellChecking = false;
+  CCInvocation->getDiagnosticOpts().IgnoreWarnings = true;
+
+  std::unique_ptr<CompilerInstance> Clang(
+      new CompilerInstance(PCHContainerOps));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance>
+    CICleanup(Clang.get());
+
+  auto &Inv = *CCInvocation;
+  Clang->setInvocation(std::move(CCInvocation));
+  OriginalSourceFile =
+      std::string(Clang->getFrontendOpts().Inputs[0].getFile());
+
+  // Set up diagnostics, capturing any diagnostics produced.
+  Clang->setDiagnostics(&Diag);
+  CaptureDroppedDiagnostics Capture(CaptureDiagsKind::All,
+                                    Clang->getDiagnostics(),
+                                    &StoredDiagnostics, nullptr);
+  ProcessWarningOptions(Diag, Inv.getDiagnosticOpts());
+
+  // Create the target instance.
+  if (!Clang->createTarget()) {
+    Clang->setInvocation(nullptr);
+    return;
+  }
+
+  assert(Clang->getFrontendOpts().Inputs.size() == 1 &&
+         "Invocation must have exactly one source file!");
+  assert(Clang->getFrontendOpts().Inputs[0].getKind().getFormat() ==
+             InputKind::Source &&
+         "FIXME: AST inputs not yet supported here!");
+  assert(Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() !=
+             Language::LLVM_IR &&
+         "IR inputs not support here!");
+
+  // Use the source and file managers that we were given.
+  Clang->setFileManager(&FileMgr);
+  Clang->setSourceManager(&SourceMgr);
+
+  // Remap files.
+  PreprocessorOpts.clearRemappedFiles();
+  PreprocessorOpts.RetainRemappedFileBuffers = true;
+  for (const auto &RemappedFile : RemappedFiles) {
+    PreprocessorOpts.addRemappedFile(RemappedFile.first, RemappedFile.second);
+    OwnedBuffers.push_back(RemappedFile.second);
+  }
+
+  // Use the code completion consumer we were given, but adding any cached
+  // code-completion results.
+  AugmentedCodeCompleteConsumer *AugmentedConsumer
+    = new AugmentedCodeCompleteConsumer(*this, Consumer, CodeCompleteOpts);
+  Clang->setCodeCompletionConsumer(AugmentedConsumer);
+
+  auto getUniqueID =
+      [&FileMgr](StringRef Filename) -> Optional<llvm::sys::fs::UniqueID> {
+    if (auto Status = FileMgr.getVirtualFileSystem().status(Filename))
+      return Status->getUniqueID();
+    return None;
+  };
+
+  auto hasSameUniqueID = [getUniqueID](StringRef LHS, StringRef RHS) {
+    if (LHS == RHS)
+      return true;
+    if (auto LHSID = getUniqueID(LHS))
+      if (auto RHSID = getUniqueID(RHS))
+        return *LHSID == *RHSID;
+    return false;
+  };
+
+  // If we have a precompiled preamble, try to use it. We only allow
+  // the use of the precompiled preamble if we're if the completion
+  // point is within the main file, after the end of the precompiled
+  // preamble.
+  std::unique_ptr<llvm::MemoryBuffer> OverrideMainBuffer;
+  if (Preamble && Line > 1 && hasSameUniqueID(File, OriginalSourceFile)) {
+    OverrideMainBuffer = getMainBufferWithPrecompiledPreamble(
+        PCHContainerOps, Inv, &FileMgr.getVirtualFileSystem(), false, Line - 1);
+  }
+
+  // If the main file has been overridden due to the use of a preamble,
+  // make that override happen and introduce the preamble.
+  if (OverrideMainBuffer) {
+    assert(Preamble &&
+           "No preamble was built, but OverrideMainBuffer is not null");
+
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
+        &FileMgr.getVirtualFileSystem();
+    Preamble->AddImplicitPreamble(Clang->getInvocation(), VFS,
+                                  OverrideMainBuffer.get());
+    // FIXME: there is no way to update VFS if it was changed by
+    // AddImplicitPreamble as FileMgr is accepted as a parameter by this method.
+    // We use on-disk preambles instead and rely on FileMgr's VFS to ensure the
+    // PCH files are always readable.
+    OwnedBuffers.push_back(OverrideMainBuffer.release());
+  } else {
+    PreprocessorOpts.PrecompiledPreambleBytes.first = 0;
+    PreprocessorOpts.PrecompiledPreambleBytes.second = false;
+  }
+
+  // Disable the preprocessing record if modules are not enabled.
+  if (!Clang->getLangOpts().Modules)
+    PreprocessorOpts.DetailedRecord = false;
+
+  std::unique_ptr<SyntaxOnlyAction> Act;
+  Act.reset(new SyntaxOnlyAction);
+  if (Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0])) {
+    if (llvm::Error Err = Act->Execute()) {
+      consumeError(std::move(Err)); // FIXME this drops errors on the floor.
+    }
+    Act->EndSourceFile();
+  }
+}
+
+bool ASTUnit::Save(StringRef File) {
+  if (HadModuleLoaderFatalFailure)
+    return true;
+
+  // Write to a temporary file and later rename it to the actual file, to avoid
+  // possible race conditions.
+  SmallString<128> TempPath;
+  TempPath = File;
+  TempPath += "-%%%%%%%%";
+  // FIXME: Can we somehow regenerate the stat cache here, or do we need to
+  // unconditionally create a stat cache when we parse the file?
+
+  if (llvm::Error Err = llvm::writeFileAtomically(
+          TempPath, File, [this](llvm::raw_ostream &Out) {
+            return serialize(Out) ? llvm::make_error<llvm::StringError>(
+                                        "ASTUnit serialization failed",
+                                        llvm::inconvertibleErrorCode())
+                                  : llvm::Error::success();
+          })) {
+    consumeError(std::move(Err));
+    return true;
+  }
+  return false;
+}
+
+static bool serializeUnit(ASTWriter &Writer,
+                          SmallVectorImpl<char> &Buffer,
+                          Sema &S,
+                          bool hasErrors,
+                          raw_ostream &OS) {
+  Writer.WriteAST(S, std::string(), nullptr, "", hasErrors);
+
+  // Write the generated bitstream to "Out".
+  if (!Buffer.empty())
+    OS.write(Buffer.data(), Buffer.size());
+
+  return false;
+}
+
+bool ASTUnit::serialize(raw_ostream &OS) {
+  // For serialization we are lenient if the errors were only warn-as-error kind.
+  bool hasErrors = getDiagnostics().hasUncompilableErrorOccurred();
+
+  if (WriterData)
+    return serializeUnit(WriterData->Writer, WriterData->Buffer,
+                         getSema(), hasErrors, OS);
+
+  SmallString<128> Buffer;
+  llvm::BitstreamWriter Stream(Buffer);
+  InMemoryModuleCache ModuleCache;
+  ASTWriter Writer(Stream, Buffer, ModuleCache, {});
+  return serializeUnit(Writer, Buffer, getSema(), hasErrors, OS);
+}
+
+using SLocRemap = ContinuousRangeMap<unsigned, int, 2>;
+
+void ASTUnit::TranslateStoredDiagnostics(
+                          FileManager &FileMgr,
+                          SourceManager &SrcMgr,
+                          const SmallVectorImpl<StandaloneDiagnostic> &Diags,
+                          SmallVectorImpl<StoredDiagnostic> &Out) {
+  // Map the standalone diagnostic into the new source manager. We also need to
+  // remap all the locations to the new view. This includes the diag location,
+  // any associated source ranges, and the source ranges of associated fix-its.
+  // FIXME: There should be a cleaner way to do this.
+  SmallVector<StoredDiagnostic, 4> Result;
+  Result.reserve(Diags.size());
+
+  for (const auto &SD : Diags) {
+    // Rebuild the StoredDiagnostic.
+    if (SD.Filename.empty())
+      continue;
+    auto FE = FileMgr.getFile(SD.Filename);
+    if (!FE)
+      continue;
+    SourceLocation FileLoc;
+    auto ItFileID = PreambleSrcLocCache.find(SD.Filename);
+    if (ItFileID == PreambleSrcLocCache.end()) {
+      FileID FID = SrcMgr.translateFile(*FE);
+      FileLoc = SrcMgr.getLocForStartOfFile(FID);
+      PreambleSrcLocCache[SD.Filename] = FileLoc;
+    } else {
+      FileLoc = ItFileID->getValue();
+    }
+
+    if (FileLoc.isInvalid())
+      continue;
+    SourceLocation L = FileLoc.getLocWithOffset(SD.LocOffset);
+    FullSourceLoc Loc(L, SrcMgr);
+
+    SmallVector<CharSourceRange, 4> Ranges;
+    Ranges.reserve(SD.Ranges.size());
+    for (const auto &Range : SD.Ranges) {
+      SourceLocation BL = FileLoc.getLocWithOffset(Range.first);
+      SourceLocation EL = FileLoc.getLocWithOffset(Range.second);
+      Ranges.push_back(CharSourceRange::getCharRange(BL, EL));
+    }
+
+    SmallVector<FixItHint, 2> FixIts;
+    FixIts.reserve(SD.FixIts.size());
+    for (const auto &FixIt : SD.FixIts) {
+      FixIts.push_back(FixItHint());
+      FixItHint &FH = FixIts.back();
+      FH.CodeToInsert = FixIt.CodeToInsert;
+      SourceLocation BL = FileLoc.getLocWithOffset(FixIt.RemoveRange.first);
+      SourceLocation EL = FileLoc.getLocWithOffset(FixIt.RemoveRange.second);
+      FH.RemoveRange = CharSourceRange::getCharRange(BL, EL);
+    }
+
+    Result.push_back(StoredDiagnostic(SD.Level, SD.ID,
+                                      SD.Message, Loc, Ranges, FixIts));
+  }
+  Result.swap(Out);
+}
+
+void ASTUnit::addFileLevelDecl(Decl *D) {
+  assert(D);
+
+  // We only care about local declarations.
+  if (D->isFromASTFile())
+    return;
+
+  SourceManager &SM = *SourceMgr;
+  SourceLocation Loc = D->getLocation();
+  if (Loc.isInvalid() || !SM.isLocalSourceLocation(Loc))
+    return;
+
+  // We only keep track of the file-level declarations of each file.
+  if (!D->getLexicalDeclContext()->isFileContext())
+    return;
+
+  SourceLocation FileLoc = SM.getFileLoc(Loc);
+  assert(SM.isLocalSourceLocation(FileLoc));
+  FileID FID;
+  unsigned Offset;
+  std::tie(FID, Offset) = SM.getDecomposedLoc(FileLoc);
+  if (FID.isInvalid())
+    return;
+
+  std::unique_ptr<LocDeclsTy> &Decls = FileDecls[FID];
+  if (!Decls)
+    Decls = std::make_unique<LocDeclsTy>();
+
+  std::pair<unsigned, Decl *> LocDecl(Offset, D);
+
+  if (Decls->empty() || Decls->back().first <= Offset) {
+    Decls->push_back(LocDecl);
+    return;
+  }
+
+  LocDeclsTy::iterator I =
+      llvm::upper_bound(*Decls, LocDecl, llvm::less_first());
+
+  Decls->insert(I, LocDecl);
+}
+
+void ASTUnit::findFileRegionDecls(FileID File, unsigned Offset, unsigned Length,
+                                  SmallVectorImpl<Decl *> &Decls) {
+  if (File.isInvalid())
+    return;
+
+  if (SourceMgr->isLoadedFileID(File)) {
+    assert(Ctx->getExternalSource() && "No external source!");
+    return Ctx->getExternalSource()->FindFileRegionDecls(File, Offset, Length,
+                                                         Decls);
+  }
+
+  FileDeclsTy::iterator I = FileDecls.find(File);
+  if (I == FileDecls.end())
+    return;
+
+  LocDeclsTy &LocDecls = *I->second;
+  if (LocDecls.empty())
+    return;
+
+  LocDeclsTy::iterator BeginIt =
+      llvm::partition_point(LocDecls, [=](std::pair<unsigned, Decl *> LD) {
+        return LD.first < Offset;
+      });
+  if (BeginIt != LocDecls.begin())
+    --BeginIt;
+
+  // If we are pointing at a top-level decl inside an objc container, we need
+  // to backtrack until we find it otherwise we will fail to report that the
+  // region overlaps with an objc container.
+  while (BeginIt != LocDecls.begin() &&
+         BeginIt->second->isTopLevelDeclInObjCContainer())
+    --BeginIt;
+
+  LocDeclsTy::iterator EndIt = llvm::upper_bound(
+      LocDecls, std::make_pair(Offset + Length, (Decl *)nullptr),
+      llvm::less_first());
+  if (EndIt != LocDecls.end())
+    ++EndIt;
+
+  for (LocDeclsTy::iterator DIt = BeginIt; DIt != EndIt; ++DIt)
+    Decls.push_back(DIt->second);
+}
+
+SourceLocation ASTUnit::getLocation(const FileEntry *File,
+                                    unsigned Line, unsigned Col) const {
+  const SourceManager &SM = getSourceManager();
+  SourceLocation Loc = SM.translateFileLineCol(File, Line, Col);
+  return SM.getMacroArgExpandedLocation(Loc);
+}
+
+SourceLocation ASTUnit::getLocation(const FileEntry *File,
+                                    unsigned Offset) const {
+  const SourceManager &SM = getSourceManager();
+  SourceLocation FileLoc = SM.translateFileLineCol(File, 1, 1);
+  return SM.getMacroArgExpandedLocation(FileLoc.getLocWithOffset(Offset));
+}
+
+/// If \arg Loc is a loaded location from the preamble, returns
+/// the corresponding local location of the main file, otherwise it returns
+/// \arg Loc.
+SourceLocation ASTUnit::mapLocationFromPreamble(SourceLocation Loc) const {
+  FileID PreambleID;
+  if (SourceMgr)
+    PreambleID = SourceMgr->getPreambleFileID();
+
+  if (Loc.isInvalid() || !Preamble || PreambleID.isInvalid())
+    return Loc;
+
+  unsigned Offs;
+  if (SourceMgr->isInFileID(Loc, PreambleID, &Offs) && Offs < Preamble->getBounds().Size) {
+    SourceLocation FileLoc
+        = SourceMgr->getLocForStartOfFile(SourceMgr->getMainFileID());
+    return FileLoc.getLocWithOffset(Offs);
+  }
+
+  return Loc;
+}
+
+/// If \arg Loc is a local location of the main file but inside the
+/// preamble chunk, returns the corresponding loaded location from the
+/// preamble, otherwise it returns \arg Loc.
+SourceLocation ASTUnit::mapLocationToPreamble(SourceLocation Loc) const {
+  FileID PreambleID;
+  if (SourceMgr)
+    PreambleID = SourceMgr->getPreambleFileID();
+
+  if (Loc.isInvalid() || !Preamble || PreambleID.isInvalid())
+    return Loc;
+
+  unsigned Offs;
+  if (SourceMgr->isInFileID(Loc, SourceMgr->getMainFileID(), &Offs) &&
+      Offs < Preamble->getBounds().Size) {
+    SourceLocation FileLoc = SourceMgr->getLocForStartOfFile(PreambleID);
+    return FileLoc.getLocWithOffset(Offs);
+  }
+
+  return Loc;
+}
+
+bool ASTUnit::isInPreambleFileID(SourceLocation Loc) const {
+  FileID FID;
+  if (SourceMgr)
+    FID = SourceMgr->getPreambleFileID();
+
+  if (Loc.isInvalid() || FID.isInvalid())
+    return false;
+
+  return SourceMgr->isInFileID(Loc, FID);
+}
+
+bool ASTUnit::isInMainFileID(SourceLocation Loc) const {
+  FileID FID;
+  if (SourceMgr)
+    FID = SourceMgr->getMainFileID();
+
+  if (Loc.isInvalid() || FID.isInvalid())
+    return false;
+
+  return SourceMgr->isInFileID(Loc, FID);
+}
+
+SourceLocation ASTUnit::getEndOfPreambleFileID() const {
+  FileID FID;
+  if (SourceMgr)
+    FID = SourceMgr->getPreambleFileID();
+
+  if (FID.isInvalid())
+    return {};
+
+  return SourceMgr->getLocForEndOfFile(FID);
+}
+
+SourceLocation ASTUnit::getStartOfMainFileID() const {
+  FileID FID;
+  if (SourceMgr)
+    FID = SourceMgr->getMainFileID();
+
+  if (FID.isInvalid())
+    return {};
+
+  return SourceMgr->getLocForStartOfFile(FID);
+}
+
+llvm::iterator_range<PreprocessingRecord::iterator>
+ASTUnit::getLocalPreprocessingEntities() const {
+  if (isMainFileAST()) {
+    serialization::ModuleFile &
+      Mod = Reader->getModuleManager().getPrimaryModule();
+    return Reader->getModulePreprocessedEntities(Mod);
+  }
+
+  if (PreprocessingRecord *PPRec = PP->getPreprocessingRecord())
+    return llvm::make_range(PPRec->local_begin(), PPRec->local_end());
+
+  return llvm::make_range(PreprocessingRecord::iterator(),
+                          PreprocessingRecord::iterator());
+}
+
+bool ASTUnit::visitLocalTopLevelDecls(void *context, DeclVisitorFn Fn) {
+  if (isMainFileAST()) {
+    serialization::ModuleFile &
+      Mod = Reader->getModuleManager().getPrimaryModule();
+    for (const auto *D : Reader->getModuleFileLevelDecls(Mod)) {
+      if (!Fn(context, D))
+        return false;
+    }
+
+    return true;
+  }
+
+  for (ASTUnit::top_level_iterator TL = top_level_begin(),
+                                TLEnd = top_level_end();
+         TL != TLEnd; ++TL) {
+    if (!Fn(context, *TL))
+      return false;
+  }
+
+  return true;
+}
+
+const FileEntry *ASTUnit::getPCHFile() {
+  if (!Reader)
+    return nullptr;
+
+  serialization::ModuleFile *Mod = nullptr;
+  Reader->getModuleManager().visit([&Mod](serialization::ModuleFile &M) {
+    switch (M.Kind) {
+    case serialization::MK_ImplicitModule:
+    case serialization::MK_ExplicitModule:
+    case serialization::MK_PrebuiltModule:
+      return true; // skip dependencies.
+    case serialization::MK_PCH:
+      Mod = &M;
+      return true; // found it.
+    case serialization::MK_Preamble:
+      return false; // look in dependencies.
+    case serialization::MK_MainFile:
+      return false; // look in dependencies.
+    }
+
+    return true;
+  });
+  if (Mod)
+    return Mod->File;
+
+  return nullptr;
+}
+
+bool ASTUnit::isModuleFile() const {
+  return isMainFileAST() && getLangOpts().isCompilingModule();
+}
+
+InputKind ASTUnit::getInputKind() const {
+  auto &LangOpts = getLangOpts();
+
+  Language Lang;
+  if (LangOpts.OpenCL)
+    Lang = Language::OpenCL;
+  else if (LangOpts.CUDA)
+    Lang = Language::CUDA;
+  else if (LangOpts.RenderScript)
+    Lang = Language::RenderScript;
+  else if (LangOpts.CPlusPlus)
+    Lang = LangOpts.ObjC ? Language::ObjCXX : Language::CXX;
+  else
+    Lang = LangOpts.ObjC ? Language::ObjC : Language::C;
+
+  InputKind::Format Fmt = InputKind::Source;
+  if (LangOpts.getCompilingModule() == LangOptions::CMK_ModuleMap)
+    Fmt = InputKind::ModuleMap;
+
+  // We don't know if input was preprocessed. Assume not.
+  bool PP = false;
+
+  return InputKind(Lang, Fmt, PP);
+}
+
+#ifndef NDEBUG
+ASTUnit::ConcurrencyState::ConcurrencyState() {
+  Mutex = new std::recursive_mutex;
+}
+
+ASTUnit::ConcurrencyState::~ConcurrencyState() {
+  delete static_cast<std::recursive_mutex *>(Mutex);
+}
+
+void ASTUnit::ConcurrencyState::start() {
+  bool acquired = static_cast<std::recursive_mutex *>(Mutex)->try_lock();
+  assert(acquired && "Concurrent access to ASTUnit!");
+}
+
+void ASTUnit::ConcurrencyState::finish() {
+  static_cast<std::recursive_mutex *>(Mutex)->unlock();
+}
+
+#else // NDEBUG
+
+ASTUnit::ConcurrencyState::ConcurrencyState() { Mutex = nullptr; }
+ASTUnit::ConcurrencyState::~ConcurrencyState() {}
+void ASTUnit::ConcurrencyState::start() {}
+void ASTUnit::ConcurrencyState::finish() {}
+
+#endif // NDEBUG
diff --git a/contrib/libs/clang14/lib/Frontend/ChainedDiagnosticConsumer.cpp b/contrib/libs/clang14/lib/Frontend/ChainedDiagnosticConsumer.cpp
new file mode 100644
index 0000000000..793c5ff8a2
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ChainedDiagnosticConsumer.cpp
@@ -0,0 +1,13 @@
+//===- ChainedDiagnosticConsumer.cpp - Chain Diagnostic Clients -----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/ChainedDiagnosticConsumer.h"
+
+using namespace clang;
+
+void ChainedDiagnosticConsumer::anchor() { }
diff --git a/contrib/libs/clang14/lib/Frontend/ChainedIncludesSource.cpp b/contrib/libs/clang14/lib/Frontend/ChainedIncludesSource.cpp
new file mode 100644
index 0000000000..380eba4562
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ChainedIncludesSource.cpp
@@ -0,0 +1,219 @@
+//===- ChainedIncludesSource.cpp - Chained PCHs in Memory -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the ChainedIncludesSource class, which converts headers
+//  to chained PCHs in memory, mainly used for testing.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/Builtins.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Sema/MultiplexExternalSemaSource.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace clang;
+
+namespace {
+class ChainedIncludesSourceImpl : public ExternalSemaSource {
+public:
+  ChainedIncludesSourceImpl(std::vector<std::unique_ptr<CompilerInstance>> CIs)
+      : CIs(std::move(CIs)) {}
+
+protected:
+  //===----------------------------------------------------------------------===//
+  // ExternalASTSource interface.
+  //===----------------------------------------------------------------------===//
+
+  /// Return the amount of memory used by memory buffers, breaking down
+  /// by heap-backed versus mmap'ed memory.
+  void getMemoryBufferSizes(MemoryBufferSizes &sizes) const override {
+    for (unsigned i = 0, e = CIs.size(); i != e; ++i) {
+      if (const ExternalASTSource *eSrc =
+          CIs[i]->getASTContext().getExternalSource()) {
+        eSrc->getMemoryBufferSizes(sizes);
+      }
+    }
+  }
+
+private:
+  std::vector<std::unique_ptr<CompilerInstance>> CIs;
+};
+
+/// Members of ChainedIncludesSource, factored out so we can initialize
+/// them before we initialize the ExternalSemaSource base class.
+struct ChainedIncludesSourceMembers {
+  ChainedIncludesSourceMembers(
+      std::vector<std::unique_ptr<CompilerInstance>> CIs,
+      IntrusiveRefCntPtr<ExternalSemaSource> FinalReader)
+      : Impl(std::move(CIs)), FinalReader(std::move(FinalReader)) {}
+  ChainedIncludesSourceImpl Impl;
+  IntrusiveRefCntPtr<ExternalSemaSource> FinalReader;
+};
+
+/// Use MultiplexExternalSemaSource to dispatch all ExternalSemaSource
+/// calls to the final reader.
+class ChainedIncludesSource
+    : private ChainedIncludesSourceMembers,
+      public MultiplexExternalSemaSource {
+public:
+  ChainedIncludesSource(std::vector<std::unique_ptr<CompilerInstance>> CIs,
+                        IntrusiveRefCntPtr<ExternalSemaSource> FinalReader)
+      : ChainedIncludesSourceMembers(std::move(CIs), std::move(FinalReader)),
+        MultiplexExternalSemaSource(Impl, *this->FinalReader) {}
+};
+}
+
+static ASTReader *
+createASTReader(CompilerInstance &CI, StringRef pchFile,
+                SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> &MemBufs,
+                SmallVectorImpl<std::string> &bufNames,
+                ASTDeserializationListener *deserialListener = nullptr) {
+  Preprocessor &PP = CI.getPreprocessor();
+  std::unique_ptr<ASTReader> Reader;
+  Reader.reset(new ASTReader(
+      PP, CI.getModuleCache(), &CI.getASTContext(), CI.getPCHContainerReader(),
+      /*Extensions=*/{},
+      /*isysroot=*/"", DisableValidationForModuleKind::PCH));
+  for (unsigned ti = 0; ti < bufNames.size(); ++ti) {
+    StringRef sr(bufNames[ti]);
+    Reader->addInMemoryBuffer(sr, std::move(MemBufs[ti]));
+  }
+  Reader->setDeserializationListener(deserialListener);
+  switch (Reader->ReadAST(pchFile, serialization::MK_PCH, SourceLocation(),
+                          ASTReader::ARR_None)) {
+  case ASTReader::Success:
+    // Set the predefines buffer as suggested by the PCH reader.
+    PP.setPredefines(Reader->getSuggestedPredefines());
+    return Reader.release();
+
+  case ASTReader::Failure:
+  case ASTReader::Missing:
+  case ASTReader::OutOfDate:
+  case ASTReader::VersionMismatch:
+  case ASTReader::ConfigurationMismatch:
+  case ASTReader::HadErrors:
+    break;
+  }
+  return nullptr;
+}
+
+IntrusiveRefCntPtr<ExternalSemaSource> clang::createChainedIncludesSource(
+    CompilerInstance &CI, IntrusiveRefCntPtr<ExternalSemaSource> &Reader) {
+
+  std::vector<std::string> &includes = CI.getPreprocessorOpts().ChainedIncludes;
+  assert(!includes.empty() && "No '-chain-include' in options!");
+
+  std::vector<std::unique_ptr<CompilerInstance>> CIs;
+  InputKind IK = CI.getFrontendOpts().Inputs[0].getKind();
+
+  SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> SerialBufs;
+  SmallVector<std::string, 4> serialBufNames;
+
+  for (unsigned i = 0, e = includes.size(); i != e; ++i) {
+    bool firstInclude = (i == 0);
+    std::unique_ptr<CompilerInvocation> CInvok;
+    CInvok.reset(new CompilerInvocation(CI.getInvocation()));
+
+    CInvok->getPreprocessorOpts().ChainedIncludes.clear();
+    CInvok->getPreprocessorOpts().ImplicitPCHInclude.clear();
+    CInvok->getPreprocessorOpts().DisablePCHOrModuleValidation =
+        DisableValidationForModuleKind::PCH;
+    CInvok->getPreprocessorOpts().Includes.clear();
+    CInvok->getPreprocessorOpts().MacroIncludes.clear();
+    CInvok->getPreprocessorOpts().Macros.clear();
+
+    CInvok->getFrontendOpts().Inputs.clear();
+    FrontendInputFile InputFile(includes[i], IK);
+    CInvok->getFrontendOpts().Inputs.push_back(InputFile);
+
+    TextDiagnosticPrinter *DiagClient =
+      new TextDiagnosticPrinter(llvm::errs(), new DiagnosticOptions());
+    IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
+        new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(), DiagClient));
+
+    std::unique_ptr<CompilerInstance> Clang(
+        new CompilerInstance(CI.getPCHContainerOperations()));
+    Clang->setInvocation(std::move(CInvok));
+    Clang->setDiagnostics(Diags.get());
+    Clang->setTarget(TargetInfo::CreateTargetInfo(
+        Clang->getDiagnostics(), Clang->getInvocation().TargetOpts));
+    Clang->createFileManager();
+    Clang->createSourceManager(Clang->getFileManager());
+    Clang->createPreprocessor(TU_Prefix);
+    Clang->getDiagnosticClient().BeginSourceFile(Clang->getLangOpts(),
+                                                 &Clang->getPreprocessor());
+    Clang->createASTContext();
+
+    auto Buffer = std::make_shared<PCHBuffer>();
+    ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions;
+    auto consumer = std::make_unique<PCHGenerator>(
+        Clang->getPreprocessor(), Clang->getModuleCache(), "-", /*isysroot=*/"",
+        Buffer, Extensions, /*AllowASTWithErrors=*/true);
+    Clang->getASTContext().setASTMutationListener(
+                                            consumer->GetASTMutationListener());
+    Clang->setASTConsumer(std::move(consumer));
+    Clang->createSema(TU_Prefix, nullptr);
+
+    if (firstInclude) {
+      Preprocessor &PP = Clang->getPreprocessor();
+      PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
+                                             PP.getLangOpts());
+    } else {
+      assert(!SerialBufs.empty());
+      SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> Bufs;
+      // TODO: Pass through the existing MemoryBuffer instances instead of
+      // allocating new ones.
+      for (auto &SB : SerialBufs)
+        Bufs.push_back(llvm::MemoryBuffer::getMemBuffer(SB->getBuffer()));
+      std::string pchName = includes[i-1];
+      llvm::raw_string_ostream os(pchName);
+      os << ".pch" << i-1;
+      serialBufNames.push_back(os.str());
+
+      IntrusiveRefCntPtr<ASTReader> Reader;
+      Reader = createASTReader(
+          *Clang, pchName, Bufs, serialBufNames,
+          Clang->getASTConsumer().GetASTDeserializationListener());
+      if (!Reader)
+        return nullptr;
+      Clang->setASTReader(Reader);
+      Clang->getASTContext().setExternalSource(Reader);
+    }
+
+    if (!Clang->InitializeSourceManager(InputFile))
+      return nullptr;
+
+    ParseAST(Clang->getSema());
+    Clang->getDiagnosticClient().EndSourceFile();
+    assert(Buffer->IsComplete && "serialization did not complete");
+    auto &serialAST = Buffer->Data;
+    SerialBufs.push_back(llvm::MemoryBuffer::getMemBufferCopy(
+        StringRef(serialAST.data(), serialAST.size())));
+    serialAST.clear();
+    CIs.push_back(std::move(Clang));
+  }
+
+  assert(!SerialBufs.empty());
+  std::string pchName = includes.back() + ".pch-final";
+  serialBufNames.push_back(pchName);
+  Reader = createASTReader(CI, pchName, SerialBufs, serialBufNames);
+  if (!Reader)
+    return nullptr;
+
+  return IntrusiveRefCntPtr<ChainedIncludesSource>(
+      new ChainedIncludesSource(std::move(CIs), Reader));
+}
diff --git a/contrib/libs/clang14/lib/Frontend/CompilerInstance.cpp b/contrib/libs/clang14/lib/Frontend/CompilerInstance.cpp
new file mode 100644
index 0000000000..2465a7e245
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/CompilerInstance.cpp
@@ -0,0 +1,2285 @@
+//===--- CompilerInstance.cpp ---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/Stack.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/Version.h"
+#include "clang/Config/config.h"
+#include "clang/Frontend/ChainedDiagnosticConsumer.h"
+#include "clang/Frontend/FrontendAction.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "clang/Frontend/LogDiagnosticPrinter.h"
+#include "clang/Frontend/SerializedDiagnosticPrinter.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Frontend/VerifyDiagnosticConsumer.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Sema/CodeCompleteConsumer.h"
+#include "clang/Sema/Sema.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/GlobalModuleIndex.h"
+#include "clang/Serialization/InMemoryModuleCache.h"
+#include "llvm/ADT/ScopeExit.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/BuryPointer.h"
+#include "llvm/Support/CrashRecoveryContext.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/LockFileManager.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/TimeProfiler.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <time.h>
+#include <utility>
+
+using namespace clang;
+
+CompilerInstance::CompilerInstance(
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps,
+    InMemoryModuleCache *SharedModuleCache)
+    : ModuleLoader(/* BuildingModule = */ SharedModuleCache),
+      Invocation(new CompilerInvocation()),
+      ModuleCache(SharedModuleCache ? SharedModuleCache
+                                    : new InMemoryModuleCache),
+      ThePCHContainerOperations(std::move(PCHContainerOps)) {}
+
+CompilerInstance::~CompilerInstance() {
+  assert(OutputFiles.empty() && "Still output files in flight?");
+}
+
+void CompilerInstance::setInvocation(
+    std::shared_ptr<CompilerInvocation> Value) {
+  Invocation = std::move(Value);
+}
+
+bool CompilerInstance::shouldBuildGlobalModuleIndex() const {
+  return (BuildGlobalModuleIndex ||
+          (TheASTReader && TheASTReader->isGlobalIndexUnavailable() &&
+           getFrontendOpts().GenerateGlobalModuleIndex)) &&
+         !DisableGeneratingGlobalModuleIndex;
+}
+
+void CompilerInstance::setDiagnostics(DiagnosticsEngine *Value) {
+  Diagnostics = Value;
+}
+
+void CompilerInstance::setVerboseOutputStream(raw_ostream &Value) {
+  OwnedVerboseOutputStream.reset();
+  VerboseOutputStream = &Value;
+}
+
+void CompilerInstance::setVerboseOutputStream(std::unique_ptr<raw_ostream> Value) {
+  OwnedVerboseOutputStream.swap(Value);
+  VerboseOutputStream = OwnedVerboseOutputStream.get();
+}
+
+void CompilerInstance::setTarget(TargetInfo *Value) { Target = Value; }
+void CompilerInstance::setAuxTarget(TargetInfo *Value) { AuxTarget = Value; }
+
+bool CompilerInstance::createTarget() {
+  // Create the target instance.
+  setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(),
+                                         getInvocation().TargetOpts));
+  if (!hasTarget())
+    return false;
+
+  // Check whether AuxTarget exists, if not, then create TargetInfo for the
+  // other side of CUDA/OpenMP/SYCL compilation.
+  if (!getAuxTarget() &&
+      (getLangOpts().CUDA || getLangOpts().OpenMPIsDevice ||
+       getLangOpts().SYCLIsDevice) &&
+      !getFrontendOpts().AuxTriple.empty()) {
+    auto TO = std::make_shared<TargetOptions>();
+    TO->Triple = llvm::Triple::normalize(getFrontendOpts().AuxTriple);
+    if (getFrontendOpts().AuxTargetCPU)
+      TO->CPU = getFrontendOpts().AuxTargetCPU.getValue();
+    if (getFrontendOpts().AuxTargetFeatures)
+      TO->FeaturesAsWritten = getFrontendOpts().AuxTargetFeatures.getValue();
+    TO->HostTriple = getTarget().getTriple().str();
+    setAuxTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), TO));
+  }
+
+  if (!getTarget().hasStrictFP() && !getLangOpts().ExpStrictFP) {
+    if (getLangOpts().getFPRoundingMode() !=
+        llvm::RoundingMode::NearestTiesToEven) {
+      getDiagnostics().Report(diag::warn_fe_backend_unsupported_fp_rounding);
+      getLangOpts().setFPRoundingMode(llvm::RoundingMode::NearestTiesToEven);
+    }
+    if (getLangOpts().getFPExceptionMode() != LangOptions::FPE_Ignore) {
+      getDiagnostics().Report(diag::warn_fe_backend_unsupported_fp_exceptions);
+      getLangOpts().setFPExceptionMode(LangOptions::FPE_Ignore);
+    }
+    // FIXME: can we disable FEnvAccess?
+  }
+
+  // We should do it here because target knows nothing about
+  // language options when it's being created.
+  if (getLangOpts().OpenCL &&
+      !getTarget().validateOpenCLTarget(getLangOpts(), getDiagnostics()))
+    return false;
+
+  // Inform the target of the language options.
+  // FIXME: We shouldn't need to do this, the target should be immutable once
+  // created. This complexity should be lifted elsewhere.
+  getTarget().adjust(getDiagnostics(), getLangOpts());
+
+  // Adjust target options based on codegen options.
+  getTarget().adjustTargetOptions(getCodeGenOpts(), getTargetOpts());
+
+  if (auto *Aux = getAuxTarget())
+    getTarget().setAuxTarget(Aux);
+
+  return true;
+}
+
+llvm::vfs::FileSystem &CompilerInstance::getVirtualFileSystem() const {
+  return getFileManager().getVirtualFileSystem();
+}
+
+void CompilerInstance::setFileManager(FileManager *Value) {
+  FileMgr = Value;
+}
+
+void CompilerInstance::setSourceManager(SourceManager *Value) {
+  SourceMgr = Value;
+}
+
+void CompilerInstance::setPreprocessor(std::shared_ptr<Preprocessor> Value) {
+  PP = std::move(Value);
+}
+
+void CompilerInstance::setASTContext(ASTContext *Value) {
+  Context = Value;
+
+  if (Context && Consumer)
+    getASTConsumer().Initialize(getASTContext());
+}
+
+void CompilerInstance::setSema(Sema *S) {
+  TheSema.reset(S);
+}
+
+void CompilerInstance::setASTConsumer(std::unique_ptr<ASTConsumer> Value) {
+  Consumer = std::move(Value);
+
+  if (Context && Consumer)
+    getASTConsumer().Initialize(getASTContext());
+}
+
+void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
+  CompletionConsumer.reset(Value);
+}
+
+std::unique_ptr<Sema> CompilerInstance::takeSema() {
+  return std::move(TheSema);
+}
+
+IntrusiveRefCntPtr<ASTReader> CompilerInstance::getASTReader() const {
+  return TheASTReader;
+}
+void CompilerInstance::setASTReader(IntrusiveRefCntPtr<ASTReader> Reader) {
+  assert(ModuleCache.get() == &Reader->getModuleManager().getModuleCache() &&
+         "Expected ASTReader to use the same PCM cache");
+  TheASTReader = std::move(Reader);
+}
+
+std::shared_ptr<ModuleDependencyCollector>
+CompilerInstance::getModuleDepCollector() const {
+  return ModuleDepCollector;
+}
+
+void CompilerInstance::setModuleDepCollector(
+    std::shared_ptr<ModuleDependencyCollector> Collector) {
+  ModuleDepCollector = std::move(Collector);
+}
+
+static void collectHeaderMaps(const HeaderSearch &HS,
+                              std::shared_ptr<ModuleDependencyCollector> MDC) {
+  SmallVector<std::string, 4> HeaderMapFileNames;
+  HS.getHeaderMapFileNames(HeaderMapFileNames);
+  for (auto &Name : HeaderMapFileNames)
+    MDC->addFile(Name);
+}
+
+static void collectIncludePCH(CompilerInstance &CI,
+                              std::shared_ptr<ModuleDependencyCollector> MDC) {
+  const PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
+  if (PPOpts.ImplicitPCHInclude.empty())
+    return;
+
+  StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
+  FileManager &FileMgr = CI.getFileManager();
+  auto PCHDir = FileMgr.getDirectory(PCHInclude);
+  if (!PCHDir) {
+    MDC->addFile(PCHInclude);
+    return;
+  }
+
+  std::error_code EC;
+  SmallString<128> DirNative;
+  llvm::sys::path::native((*PCHDir)->getName(), DirNative);
+  llvm::vfs::FileSystem &FS = FileMgr.getVirtualFileSystem();
+  SimpleASTReaderListener Validator(CI.getPreprocessor());
+  for (llvm::vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
+       Dir != DirEnd && !EC; Dir.increment(EC)) {
+    // Check whether this is an AST file. ASTReader::isAcceptableASTFile is not
+    // used here since we're not interested in validating the PCH at this time,
+    // but only to check whether this is a file containing an AST.
+    if (!ASTReader::readASTFileControlBlock(
+            Dir->path(), FileMgr, CI.getPCHContainerReader(),
+            /*FindModuleFileExtensions=*/false, Validator,
+            /*ValidateDiagnosticOptions=*/false))
+      MDC->addFile(Dir->path());
+  }
+}
+
+static void collectVFSEntries(CompilerInstance &CI,
+                              std::shared_ptr<ModuleDependencyCollector> MDC) {
+  if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
+    return;
+
+  // Collect all VFS found.
+  SmallVector<llvm::vfs::YAMLVFSEntry, 16> VFSEntries;
+  for (const std::string &VFSFile : CI.getHeaderSearchOpts().VFSOverlayFiles) {
+    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
+        llvm::MemoryBuffer::getFile(VFSFile);
+    if (!Buffer)
+      return;
+    llvm::vfs::collectVFSFromYAML(std::move(Buffer.get()),
+                                  /*DiagHandler*/ nullptr, VFSFile, VFSEntries);
+  }
+
+  for (auto &E : VFSEntries)
+    MDC->addFile(E.VPath, E.RPath);
+}
+
+// Diagnostics
+static void SetUpDiagnosticLog(DiagnosticOptions *DiagOpts,
+                               const CodeGenOptions *CodeGenOpts,
+                               DiagnosticsEngine &Diags) {
+  std::error_code EC;
+  std::unique_ptr<raw_ostream> StreamOwner;
+  raw_ostream *OS = &llvm::errs();
+  if (DiagOpts->DiagnosticLogFile != "-") {
+    // Create the output stream.
+    auto FileOS = std::make_unique<llvm::raw_fd_ostream>(
+        DiagOpts->DiagnosticLogFile, EC,
+        llvm::sys::fs::OF_Append | llvm::sys::fs::OF_TextWithCRLF);
+    if (EC) {
+      Diags.Report(diag::warn_fe_cc_log_diagnostics_failure)
+          << DiagOpts->DiagnosticLogFile << EC.message();
+    } else {
+      FileOS->SetUnbuffered();
+      OS = FileOS.get();
+      StreamOwner = std::move(FileOS);
+    }
+  }
+
+  // Chain in the diagnostic client which will log the diagnostics.
+  auto Logger = std::make_unique<LogDiagnosticPrinter>(*OS, DiagOpts,
+                                                        std::move(StreamOwner));
+  if (CodeGenOpts)
+    Logger->setDwarfDebugFlags(CodeGenOpts->DwarfDebugFlags);
+  if (Diags.ownsClient()) {
+    Diags.setClient(
+        new ChainedDiagnosticConsumer(Diags.takeClient(), std::move(Logger)));
+  } else {
+    Diags.setClient(
+        new ChainedDiagnosticConsumer(Diags.getClient(), std::move(Logger)));
+  }
+}
+
+static void SetupSerializedDiagnostics(DiagnosticOptions *DiagOpts,
+                                       DiagnosticsEngine &Diags,
+                                       StringRef OutputFile) {
+  auto SerializedConsumer =
+      clang::serialized_diags::create(OutputFile, DiagOpts);
+
+  if (Diags.ownsClient()) {
+    Diags.setClient(new ChainedDiagnosticConsumer(
+        Diags.takeClient(), std::move(SerializedConsumer)));
+  } else {
+    Diags.setClient(new ChainedDiagnosticConsumer(
+        Diags.getClient(), std::move(SerializedConsumer)));
+  }
+}
+
+void CompilerInstance::createDiagnostics(DiagnosticConsumer *Client,
+                                         bool ShouldOwnClient) {
+  Diagnostics = createDiagnostics(&getDiagnosticOpts(), Client,
+                                  ShouldOwnClient, &getCodeGenOpts());
+}
+
+IntrusiveRefCntPtr<DiagnosticsEngine>
+CompilerInstance::createDiagnostics(DiagnosticOptions *Opts,
+                                    DiagnosticConsumer *Client,
+                                    bool ShouldOwnClient,
+                                    const CodeGenOptions *CodeGenOpts) {
+  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
+  IntrusiveRefCntPtr<DiagnosticsEngine>
+      Diags(new DiagnosticsEngine(DiagID, Opts));
+
+  // Create the diagnostic client for reporting errors or for
+  // implementing -verify.
+  if (Client) {
+    Diags->setClient(Client, ShouldOwnClient);
+  } else
+    Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
+
+  // Chain in -verify checker, if requested.
+  if (Opts->VerifyDiagnostics)
+    Diags->setClient(new VerifyDiagnosticConsumer(*Diags));
+
+  // Chain in -diagnostic-log-file dumper, if requested.
+  if (!Opts->DiagnosticLogFile.empty())
+    SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags);
+
+  if (!Opts->DiagnosticSerializationFile.empty())
+    SetupSerializedDiagnostics(Opts, *Diags,
+                               Opts->DiagnosticSerializationFile);
+
+  // Configure our handling of diagnostics.
+  ProcessWarningOptions(*Diags, *Opts);
+
+  return Diags;
+}
+
+// File Manager
+
+FileManager *CompilerInstance::createFileManager(
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+  if (!VFS)
+    VFS = FileMgr ? &FileMgr->getVirtualFileSystem()
+                  : createVFSFromCompilerInvocation(getInvocation(),
+                                                    getDiagnostics());
+  assert(VFS && "FileManager has no VFS?");
+  FileMgr = new FileManager(getFileSystemOpts(), std::move(VFS));
+  return FileMgr.get();
+}
+
+// Source Manager
+
+void CompilerInstance::createSourceManager(FileManager &FileMgr) {
+  SourceMgr = new SourceManager(getDiagnostics(), FileMgr);
+}
+
+// Initialize the remapping of files to alternative contents, e.g.,
+// those specified through other files.
+static void InitializeFileRemapping(DiagnosticsEngine &Diags,
+                                    SourceManager &SourceMgr,
+                                    FileManager &FileMgr,
+                                    const PreprocessorOptions &InitOpts) {
+  // Remap files in the source manager (with buffers).
+  for (const auto &RB : InitOpts.RemappedFileBuffers) {
+    // Create the file entry for the file that we're mapping from.
+    const FileEntry *FromFile =
+        FileMgr.getVirtualFile(RB.first, RB.second->getBufferSize(), 0);
+    if (!FromFile) {
+      Diags.Report(diag::err_fe_remap_missing_from_file) << RB.first;
+      if (!InitOpts.RetainRemappedFileBuffers)
+        delete RB.second;
+      continue;
+    }
+
+    // Override the contents of the "from" file with the contents of the
+    // "to" file. If the caller owns the buffers, then pass a MemoryBufferRef;
+    // otherwise, pass as a std::unique_ptr<MemoryBuffer> to transfer ownership
+    // to the SourceManager.
+    if (InitOpts.RetainRemappedFileBuffers)
+      SourceMgr.overrideFileContents(FromFile, RB.second->getMemBufferRef());
+    else
+      SourceMgr.overrideFileContents(
+          FromFile, std::unique_ptr<llvm::MemoryBuffer>(
+                        const_cast<llvm::MemoryBuffer *>(RB.second)));
+  }
+
+  // Remap files in the source manager (with other files).
+  for (const auto &RF : InitOpts.RemappedFiles) {
+    // Find the file that we're mapping to.
+    auto ToFile = FileMgr.getFile(RF.second);
+    if (!ToFile) {
+      Diags.Report(diag::err_fe_remap_missing_to_file) << RF.first << RF.second;
+      continue;
+    }
+
+    // Create the file entry for the file that we're mapping from.
+    const FileEntry *FromFile =
+        FileMgr.getVirtualFile(RF.first, (*ToFile)->getSize(), 0);
+    if (!FromFile) {
+      Diags.Report(diag::err_fe_remap_missing_from_file) << RF.first;
+      continue;
+    }
+
+    // Override the contents of the "from" file with the contents of
+    // the "to" file.
+    SourceMgr.overrideFileContents(FromFile, *ToFile);
+  }
+
+  SourceMgr.setOverridenFilesKeepOriginalName(
+      InitOpts.RemappedFilesKeepOriginalName);
+}
+
+// Preprocessor
+
+void CompilerInstance::createPreprocessor(TranslationUnitKind TUKind) {
+  const PreprocessorOptions &PPOpts = getPreprocessorOpts();
+
+  // The AST reader holds a reference to the old preprocessor (if any).
+  TheASTReader.reset();
+
+  // Create the Preprocessor.
+  HeaderSearch *HeaderInfo =
+      new HeaderSearch(getHeaderSearchOptsPtr(), getSourceManager(),
+                       getDiagnostics(), getLangOpts(), &getTarget());
+  PP = std::make_shared<Preprocessor>(Invocation->getPreprocessorOptsPtr(),
+                                      getDiagnostics(), getLangOpts(),
+                                      getSourceManager(), *HeaderInfo, *this,
+                                      /*IdentifierInfoLookup=*/nullptr,
+                                      /*OwnsHeaderSearch=*/true, TUKind);
+  getTarget().adjust(getDiagnostics(), getLangOpts());
+  PP->Initialize(getTarget(), getAuxTarget());
+
+  if (PPOpts.DetailedRecord)
+    PP->createPreprocessingRecord();
+
+  // Apply remappings to the source manager.
+  InitializeFileRemapping(PP->getDiagnostics(), PP->getSourceManager(),
+                          PP->getFileManager(), PPOpts);
+
+  // Predefine macros and configure the preprocessor.
+  InitializePreprocessor(*PP, PPOpts, getPCHContainerReader(),
+                         getFrontendOpts());
+
+  // Initialize the header search object.  In CUDA compilations, we use the aux
+  // triple (the host triple) to initialize our header search, since we need to
+  // find the host headers in order to compile the CUDA code.
+  const llvm::Triple *HeaderSearchTriple = &PP->getTargetInfo().getTriple();
+  if (PP->getTargetInfo().getTriple().getOS() == llvm::Triple::CUDA &&
+      PP->getAuxTargetInfo())
+    HeaderSearchTriple = &PP->getAuxTargetInfo()->getTriple();
+
+  ApplyHeaderSearchOptions(PP->getHeaderSearchInfo(), getHeaderSearchOpts(),
+                           PP->getLangOpts(), *HeaderSearchTriple);
+
+  PP->setPreprocessedOutput(getPreprocessorOutputOpts().ShowCPP);
+
+  if (PP->getLangOpts().Modules && PP->getLangOpts().ImplicitModules) {
+    std::string ModuleHash = getInvocation().getModuleHash();
+    PP->getHeaderSearchInfo().setModuleHash(ModuleHash);
+    PP->getHeaderSearchInfo().setModuleCachePath(
+        getSpecificModuleCachePath(ModuleHash));
+  }
+
+  // Handle generating dependencies, if requested.
+  const DependencyOutputOptions &DepOpts = getDependencyOutputOpts();
+  if (!DepOpts.OutputFile.empty())
+    addDependencyCollector(std::make_shared<DependencyFileGenerator>(DepOpts));
+  if (!DepOpts.DOTOutputFile.empty())
+    AttachDependencyGraphGen(*PP, DepOpts.DOTOutputFile,
+                             getHeaderSearchOpts().Sysroot);
+
+  // If we don't have a collector, but we are collecting module dependencies,
+  // then we're the top level compiler instance and need to create one.
+  if (!ModuleDepCollector && !DepOpts.ModuleDependencyOutputDir.empty()) {
+    ModuleDepCollector = std::make_shared<ModuleDependencyCollector>(
+        DepOpts.ModuleDependencyOutputDir);
+  }
+
+  // If there is a module dep collector, register with other dep collectors
+  // and also (a) collect header maps and (b) TODO: input vfs overlay files.
+  if (ModuleDepCollector) {
+    addDependencyCollector(ModuleDepCollector);
+    collectHeaderMaps(PP->getHeaderSearchInfo(), ModuleDepCollector);
+    collectIncludePCH(*this, ModuleDepCollector);
+    collectVFSEntries(*this, ModuleDepCollector);
+  }
+
+  for (auto &Listener : DependencyCollectors)
+    Listener->attachToPreprocessor(*PP);
+
+  // Handle generating header include information, if requested.
+  if (DepOpts.ShowHeaderIncludes)
+    AttachHeaderIncludeGen(*PP, DepOpts);
+  if (!DepOpts.HeaderIncludeOutputFile.empty()) {
+    StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
+    if (OutputPath == "-")
+      OutputPath = "";
+    AttachHeaderIncludeGen(*PP, DepOpts,
+                           /*ShowAllHeaders=*/true, OutputPath,
+                           /*ShowDepth=*/false);
+  }
+
+  if (DepOpts.ShowIncludesDest != ShowIncludesDestination::None) {
+    AttachHeaderIncludeGen(*PP, DepOpts,
+                           /*ShowAllHeaders=*/true, /*OutputPath=*/"",
+                           /*ShowDepth=*/true, /*MSStyle=*/true);
+  }
+}
+
+std::string CompilerInstance::getSpecificModuleCachePath(StringRef ModuleHash) {
+  // Set up the module path, including the hash for the module-creation options.
+  SmallString<256> SpecificModuleCache(getHeaderSearchOpts().ModuleCachePath);
+  if (!SpecificModuleCache.empty() && !getHeaderSearchOpts().DisableModuleHash)
+    llvm::sys::path::append(SpecificModuleCache, ModuleHash);
+  return std::string(SpecificModuleCache.str());
+}
+
+// ASTContext
+
+void CompilerInstance::createASTContext() {
+  Preprocessor &PP = getPreprocessor();
+  auto *Context = new ASTContext(getLangOpts(), PP.getSourceManager(),
+                                 PP.getIdentifierTable(), PP.getSelectorTable(),
+                                 PP.getBuiltinInfo(), PP.TUKind);
+  Context->InitBuiltinTypes(getTarget(), getAuxTarget());
+  setASTContext(Context);
+}
+
+// ExternalASTSource
+
+namespace {
+// Helper to recursively read the module names for all modules we're adding.
+// We mark these as known and redirect any attempt to load that module to
+// the files we were handed.
+struct ReadModuleNames : ASTReaderListener {
+  Preprocessor &PP;
+  llvm::SmallVector<std::string, 8> LoadedModules;
+
+  ReadModuleNames(Preprocessor &PP) : PP(PP) {}
+
+  void ReadModuleName(StringRef ModuleName) override {
+    // Keep the module name as a string for now. It's not safe to create a new
+    // IdentifierInfo from an ASTReader callback.
+    LoadedModules.push_back(ModuleName.str());
+  }
+
+  void registerAll() {
+    ModuleMap &MM = PP.getHeaderSearchInfo().getModuleMap();
+    for (const std::string &LoadedModule : LoadedModules)
+      MM.cacheModuleLoad(*PP.getIdentifierInfo(LoadedModule),
+                         MM.findModule(LoadedModule));
+    LoadedModules.clear();
+  }
+
+  void markAllUnavailable() {
+    for (const std::string &LoadedModule : LoadedModules) {
+      if (Module *M = PP.getHeaderSearchInfo().getModuleMap().findModule(
+              LoadedModule)) {
+        M->HasIncompatibleModuleFile = true;
+
+        // Mark module as available if the only reason it was unavailable
+        // was missing headers.
+        SmallVector<Module *, 2> Stack;
+        Stack.push_back(M);
+        while (!Stack.empty()) {
+          Module *Current = Stack.pop_back_val();
+          if (Current->IsUnimportable) continue;
+          Current->IsAvailable = true;
+          Stack.insert(Stack.end(),
+                       Current->submodule_begin(), Current->submodule_end());
+        }
+      }
+    }
+    LoadedModules.clear();
+  }
+};
+} // namespace
+
+void CompilerInstance::createPCHExternalASTSource(
+    StringRef Path, DisableValidationForModuleKind DisableValidation,
+    bool AllowPCHWithCompilerErrors, void *DeserializationListener,
+    bool OwnDeserializationListener) {
+  bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
+  TheASTReader = createPCHExternalASTSource(
+      Path, getHeaderSearchOpts().Sysroot, DisableValidation,
+      AllowPCHWithCompilerErrors, getPreprocessor(), getModuleCache(),
+      getASTContext(), getPCHContainerReader(),
+      getFrontendOpts().ModuleFileExtensions, DependencyCollectors,
+      DeserializationListener, OwnDeserializationListener, Preamble,
+      getFrontendOpts().UseGlobalModuleIndex);
+}
+
+IntrusiveRefCntPtr<ASTReader> CompilerInstance::createPCHExternalASTSource(
+    StringRef Path, StringRef Sysroot,
+    DisableValidationForModuleKind DisableValidation,
+    bool AllowPCHWithCompilerErrors, Preprocessor &PP,
+    InMemoryModuleCache &ModuleCache, ASTContext &Context,
+    const PCHContainerReader &PCHContainerRdr,
+    ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
+    ArrayRef<std::shared_ptr<DependencyCollector>> DependencyCollectors,
+    void *DeserializationListener, bool OwnDeserializationListener,
+    bool Preamble, bool UseGlobalModuleIndex) {
+  HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
+
+  IntrusiveRefCntPtr<ASTReader> Reader(new ASTReader(
+      PP, ModuleCache, &Context, PCHContainerRdr, Extensions,
+      Sysroot.empty() ? "" : Sysroot.data(), DisableValidation,
+      AllowPCHWithCompilerErrors, /*AllowConfigurationMismatch*/ false,
+      HSOpts.ModulesValidateSystemHeaders, HSOpts.ValidateASTInputFilesContent,
+      UseGlobalModuleIndex));
+
+  // We need the external source to be set up before we read the AST, because
+  // eagerly-deserialized declarations may use it.
+  Context.setExternalSource(Reader.get());
+
+  Reader->setDeserializationListener(
+      static_cast<ASTDeserializationListener *>(DeserializationListener),
+      /*TakeOwnership=*/OwnDeserializationListener);
+
+  for (auto &Listener : DependencyCollectors)
+    Listener->attachToASTReader(*Reader);
+
+  auto Listener = std::make_unique<ReadModuleNames>(PP);
+  auto &ListenerRef = *Listener;
+  ASTReader::ListenerScope ReadModuleNamesListener(*Reader,
+                                                   std::move(Listener));
+
+  switch (Reader->ReadAST(Path,
+                          Preamble ? serialization::MK_Preamble
+                                   : serialization::MK_PCH,
+                          SourceLocation(),
+                          ASTReader::ARR_None)) {
+  case ASTReader::Success:
+    // Set the predefines buffer as suggested by the PCH reader. Typically, the
+    // predefines buffer will be empty.
+    PP.setPredefines(Reader->getSuggestedPredefines());
+    ListenerRef.registerAll();
+    return Reader;
+
+  case ASTReader::Failure:
+    // Unrecoverable failure: don't even try to process the input file.
+    break;
+
+  case ASTReader::Missing:
+  case ASTReader::OutOfDate:
+  case ASTReader::VersionMismatch:
+  case ASTReader::ConfigurationMismatch:
+  case ASTReader::HadErrors:
+    // No suitable PCH file could be found. Return an error.
+    break;
+  }
+
+  ListenerRef.markAllUnavailable();
+  Context.setExternalSource(nullptr);
+  return nullptr;
+}
+
+// Code Completion
+
+static bool EnableCodeCompletion(Preprocessor &PP,
+                                 StringRef Filename,
+                                 unsigned Line,
+                                 unsigned Column) {
+  // Tell the source manager to chop off the given file at a specific
+  // line and column.
+  auto Entry = PP.getFileManager().getFile(Filename);
+  if (!Entry) {
+    PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
+      << Filename;
+    return true;
+  }
+
+  // Truncate the named file at the given line/column.
+  PP.SetCodeCompletionPoint(*Entry, Line, Column);
+  return false;
+}
+
+void CompilerInstance::createCodeCompletionConsumer() {
+  const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
+  if (!CompletionConsumer) {
+    setCodeCompletionConsumer(
+      createCodeCompletionConsumer(getPreprocessor(),
+                                   Loc.FileName, Loc.Line, Loc.Column,
+                                   getFrontendOpts().CodeCompleteOpts,
+                                   llvm::outs()));
+    if (!CompletionConsumer)
+      return;
+  } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
+                                  Loc.Line, Loc.Column)) {
+    setCodeCompletionConsumer(nullptr);
+    return;
+  }
+}
+
+void CompilerInstance::createFrontendTimer() {
+  FrontendTimerGroup.reset(
+      new llvm::TimerGroup("frontend", "Clang front-end time report"));
+  FrontendTimer.reset(
+      new llvm::Timer("frontend", "Clang front-end timer",
+                      *FrontendTimerGroup));
+}
+
+CodeCompleteConsumer *
+CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
+                                               StringRef Filename,
+                                               unsigned Line,
+                                               unsigned Column,
+                                               const CodeCompleteOptions &Opts,
+                                               raw_ostream &OS) {
+  if (EnableCodeCompletion(PP, Filename, Line, Column))
+    return nullptr;
+
+  // Set up the creation routine for code-completion.
+  return new PrintingCodeCompleteConsumer(Opts, OS);
+}
+
+void CompilerInstance::createSema(TranslationUnitKind TUKind,
+                                  CodeCompleteConsumer *CompletionConsumer) {
+  TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
+                         TUKind, CompletionConsumer));
+  // Attach the external sema source if there is any.
+  if (ExternalSemaSrc) {
+    TheSema->addExternalSource(ExternalSemaSrc.get());
+    ExternalSemaSrc->InitializeSema(*TheSema);
+  }
+}
+
+// Output Files
+
+void CompilerInstance::clearOutputFiles(bool EraseFiles) {
+  // Ignore errors that occur when trying to discard the temp file.
+  for (OutputFile &OF : OutputFiles) {
+    if (EraseFiles) {
+      if (OF.File)
+        consumeError(OF.File->discard());
+      if (!OF.Filename.empty())
+        llvm::sys::fs::remove(OF.Filename);
+      continue;
+    }
+
+    if (!OF.File)
+      continue;
+
+    if (OF.File->TmpName.empty()) {
+      consumeError(OF.File->discard());
+      continue;
+    }
+
+    // If '-working-directory' was passed, the output filename should be
+    // relative to that.
+    SmallString<128> NewOutFile(OF.Filename);
+    FileMgr->FixupRelativePath(NewOutFile);
+
+    llvm::Error E = OF.File->keep(NewOutFile);
+    if (!E)
+      continue;
+
+    getDiagnostics().Report(diag::err_unable_to_rename_temp)
+        << OF.File->TmpName << OF.Filename << std::move(E);
+
+    llvm::sys::fs::remove(OF.File->TmpName);
+  }
+  OutputFiles.clear();
+  if (DeleteBuiltModules) {
+    for (auto &Module : BuiltModules)
+      llvm::sys::fs::remove(Module.second);
+    BuiltModules.clear();
+  }
+}
+
+std::unique_ptr<raw_pwrite_stream> CompilerInstance::createDefaultOutputFile(
+    bool Binary, StringRef InFile, StringRef Extension, bool RemoveFileOnSignal,
+    bool CreateMissingDirectories, bool ForceUseTemporary) {
+  StringRef OutputPath = getFrontendOpts().OutputFile;
+  Optional<SmallString<128>> PathStorage;
+  if (OutputPath.empty()) {
+    if (InFile == "-" || Extension.empty()) {
+      OutputPath = "-";
+    } else {
+      PathStorage.emplace(InFile);
+      llvm::sys::path::replace_extension(*PathStorage, Extension);
+      OutputPath = *PathStorage;
+    }
+  }
+
+  return createOutputFile(OutputPath, Binary, RemoveFileOnSignal,
+                          getFrontendOpts().UseTemporary || ForceUseTemporary,
+                          CreateMissingDirectories);
+}
+
+std::unique_ptr<raw_pwrite_stream> CompilerInstance::createNullOutputFile() {
+  return std::make_unique<llvm::raw_null_ostream>();
+}
+
+std::unique_ptr<raw_pwrite_stream>
+CompilerInstance::createOutputFile(StringRef OutputPath, bool Binary,
+                                   bool RemoveFileOnSignal, bool UseTemporary,
+                                   bool CreateMissingDirectories) {
+  Expected<std::unique_ptr<raw_pwrite_stream>> OS =
+      createOutputFileImpl(OutputPath, Binary, RemoveFileOnSignal, UseTemporary,
+                           CreateMissingDirectories);
+  if (OS)
+    return std::move(*OS);
+  getDiagnostics().Report(diag::err_fe_unable_to_open_output)
+      << OutputPath << errorToErrorCode(OS.takeError()).message();
+  return nullptr;
+}
+
+Expected<std::unique_ptr<llvm::raw_pwrite_stream>>
+CompilerInstance::createOutputFileImpl(StringRef OutputPath, bool Binary,
+                                       bool RemoveFileOnSignal,
+                                       bool UseTemporary,
+                                       bool CreateMissingDirectories) {
+  assert((!CreateMissingDirectories || UseTemporary) &&
+         "CreateMissingDirectories is only allowed when using temporary files");
+
+  std::unique_ptr<llvm::raw_fd_ostream> OS;
+  Optional<StringRef> OSFile;
+
+  if (UseTemporary) {
+    if (OutputPath == "-")
+      UseTemporary = false;
+    else {
+      llvm::sys::fs::file_status Status;
+      llvm::sys::fs::status(OutputPath, Status);
+      if (llvm::sys::fs::exists(Status)) {
+        // Fail early if we can't write to the final destination.
+        if (!llvm::sys::fs::can_write(OutputPath))
+          return llvm::errorCodeToError(
+              make_error_code(llvm::errc::operation_not_permitted));
+
+        // Don't use a temporary if the output is a special file. This handles
+        // things like '-o /dev/null'
+        if (!llvm::sys::fs::is_regular_file(Status))
+          UseTemporary = false;
+      }
+    }
+  }
+
+  Optional<llvm::sys::fs::TempFile> Temp;
+  if (UseTemporary) {
+    // Create a temporary file.
+    // Insert -%%%%%%%% before the extension (if any), and because some tools
+    // (noticeable, clang's own GlobalModuleIndex.cpp) glob for build
+    // artifacts, also append .tmp.
+    StringRef OutputExtension = llvm::sys::path::extension(OutputPath);
+    SmallString<128> TempPath =
+        StringRef(OutputPath).drop_back(OutputExtension.size());
+    TempPath += "-%%%%%%%%";
+    TempPath += OutputExtension;
+    TempPath += ".tmp";
+    Expected<llvm::sys::fs::TempFile> ExpectedFile =
+        llvm::sys::fs::TempFile::create(
+            TempPath, llvm::sys::fs::all_read | llvm::sys::fs::all_write,
+            Binary ? llvm::sys::fs::OF_None : llvm::sys::fs::OF_Text);
+
+    llvm::Error E = handleErrors(
+        ExpectedFile.takeError(), [&](const llvm::ECError &E) -> llvm::Error {
+          std::error_code EC = E.convertToErrorCode();
+          if (CreateMissingDirectories &&
+              EC == llvm::errc::no_such_file_or_directory) {
+            StringRef Parent = llvm::sys::path::parent_path(OutputPath);
+            EC = llvm::sys::fs::create_directories(Parent);
+            if (!EC) {
+              ExpectedFile = llvm::sys::fs::TempFile::create(TempPath);
+              if (!ExpectedFile)
+                return llvm::errorCodeToError(
+                    llvm::errc::no_such_file_or_directory);
+            }
+          }
+          return llvm::errorCodeToError(EC);
+        });
+
+    if (E) {
+      consumeError(std::move(E));
+    } else {
+      Temp = std::move(ExpectedFile.get());
+      OS.reset(new llvm::raw_fd_ostream(Temp->FD, /*shouldClose=*/false));
+      OSFile = Temp->TmpName;
+    }
+    // If we failed to create the temporary, fallback to writing to the file
+    // directly. This handles the corner case where we cannot write to the
+    // directory, but can write to the file.
+  }
+
+  if (!OS) {
+    OSFile = OutputPath;
+    std::error_code EC;
+    OS.reset(new llvm::raw_fd_ostream(
+        *OSFile, EC,
+        (Binary ? llvm::sys::fs::OF_None : llvm::sys::fs::OF_TextWithCRLF)));
+    if (EC)
+      return llvm::errorCodeToError(EC);
+  }
+
+  // Add the output file -- but don't try to remove "-", since this means we are
+  // using stdin.
+  OutputFiles.emplace_back(((OutputPath != "-") ? OutputPath : "").str(),
+                           std::move(Temp));
+
+  if (!Binary || OS->supportsSeeking())
+    return std::move(OS);
+
+  return std::make_unique<llvm::buffer_unique_ostream>(std::move(OS));
+}
+
+// Initialization Utilities
+
+bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input){
+  return InitializeSourceManager(Input, getDiagnostics(), getFileManager(),
+                                 getSourceManager());
+}
+
+// static
+bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input,
+                                               DiagnosticsEngine &Diags,
+                                               FileManager &FileMgr,
+                                               SourceManager &SourceMgr) {
+  SrcMgr::CharacteristicKind Kind =
+      Input.getKind().getFormat() == InputKind::ModuleMap
+          ? Input.isSystem() ? SrcMgr::C_System_ModuleMap
+                             : SrcMgr::C_User_ModuleMap
+          : Input.isSystem() ? SrcMgr::C_System : SrcMgr::C_User;
+
+  if (Input.isBuffer()) {
+    SourceMgr.setMainFileID(SourceMgr.createFileID(Input.getBuffer(), Kind));
+    assert(SourceMgr.getMainFileID().isValid() &&
+           "Couldn't establish MainFileID!");
+    return true;
+  }
+
+  StringRef InputFile = Input.getFile();
+
+  // Figure out where to get and map in the main file.
+  auto FileOrErr = InputFile == "-"
+                       ? FileMgr.getSTDIN()
+                       : FileMgr.getFileRef(InputFile, /*OpenFile=*/true);
+  if (!FileOrErr) {
+    // FIXME: include the error in the diagnostic even when it's not stdin.
+    auto EC = llvm::errorToErrorCode(FileOrErr.takeError());
+    if (InputFile != "-")
+      Diags.Report(diag::err_fe_error_reading) << InputFile;
+    else
+      Diags.Report(diag::err_fe_error_reading_stdin) << EC.message();
+    return false;
+  }
+
+  SourceMgr.setMainFileID(
+      SourceMgr.createFileID(*FileOrErr, SourceLocation(), Kind));
+
+  assert(SourceMgr.getMainFileID().isValid() &&
+         "Couldn't establish MainFileID!");
+  return true;
+}
+
+// High-Level Operations
+
+bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
+  assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
+  assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
+  assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
+
+  // Mark this point as the bottom of the stack if we don't have somewhere
+  // better. We generally expect frontend actions to be invoked with (nearly)
+  // DesiredStackSpace available.
+  noteBottomOfStack();
+
+  auto FinishDiagnosticClient = llvm::make_scope_exit([&]() {
+    // Notify the diagnostic client that all files were processed.
+    getDiagnosticClient().finish();
+  });
+
+  raw_ostream &OS = getVerboseOutputStream();
+
+  if (!Act.PrepareToExecute(*this))
+    return false;
+
+  if (!createTarget())
+    return false;
+
+  // rewriter project will change target built-in bool type from its default.
+  if (getFrontendOpts().ProgramAction == frontend::RewriteObjC)
+    getTarget().noSignedCharForObjCBool();
+
+  // Validate/process some options.
+  if (getHeaderSearchOpts().Verbose)
+    OS << "clang -cc1 version " CLANG_VERSION_STRING
+       << " based upon " << BACKEND_PACKAGE_STRING
+       << " default target " << llvm::sys::getDefaultTargetTriple() << "\n";
+
+  if (getCodeGenOpts().TimePasses)
+    createFrontendTimer();
+
+  if (getFrontendOpts().ShowStats || !getFrontendOpts().StatsFile.empty())
+    llvm::EnableStatistics(false);
+
+  for (const FrontendInputFile &FIF : getFrontendOpts().Inputs) {
+    // Reset the ID tables if we are reusing the SourceManager and parsing
+    // regular files.
+    if (hasSourceManager() && !Act.isModelParsingAction())
+      getSourceManager().clearIDTables();
+
+    if (Act.BeginSourceFile(*this, FIF)) {
+      if (llvm::Error Err = Act.Execute()) {
+        consumeError(std::move(Err)); // FIXME this drops errors on the floor.
+      }
+      Act.EndSourceFile();
+    }
+  }
+
+  if (getDiagnosticOpts().ShowCarets) {
+    // We can have multiple diagnostics sharing one diagnostic client.
+    // Get the total number of warnings/errors from the client.
+    unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
+    unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
+
+    if (NumWarnings)
+      OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
+    if (NumWarnings && NumErrors)
+      OS << " and ";
+    if (NumErrors)
+      OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
+    if (NumWarnings || NumErrors) {
+      OS << " generated";
+      if (getLangOpts().CUDA) {
+        if (!getLangOpts().CUDAIsDevice) {
+          OS << " when compiling for host";
+        } else {
+          OS << " when compiling for " << getTargetOpts().CPU;
+        }
+      }
+      OS << ".\n";
+    }
+  }
+
+  if (getFrontendOpts().ShowStats) {
+    if (hasFileManager()) {
+      getFileManager().PrintStats();
+      OS << '\n';
+    }
+    llvm::PrintStatistics(OS);
+  }
+  StringRef StatsFile = getFrontendOpts().StatsFile;
+  if (!StatsFile.empty()) {
+    std::error_code EC;
+    auto StatS = std::make_unique<llvm::raw_fd_ostream>(
+        StatsFile, EC, llvm::sys::fs::OF_TextWithCRLF);
+    if (EC) {
+      getDiagnostics().Report(diag::warn_fe_unable_to_open_stats_file)
+          << StatsFile << EC.message();
+    } else {
+      llvm::PrintStatisticsJSON(*StatS);
+    }
+  }
+
+  return !getDiagnostics().getClient()->getNumErrors();
+}
+
+void CompilerInstance::LoadRequestedPlugins() {
+  // Load any requested plugins.
+  for (const std::string &Path : getFrontendOpts().Plugins) {
+    std::string Error;
+    if (llvm::sys::DynamicLibrary::LoadLibraryPermanently(Path.c_str(), &Error))
+      getDiagnostics().Report(diag::err_fe_unable_to_load_plugin)
+          << Path << Error;
+  }
+
+  // Check if any of the loaded plugins replaces the main AST action
+  for (const FrontendPluginRegistry::entry &Plugin :
+       FrontendPluginRegistry::entries()) {
+    std::unique_ptr<PluginASTAction> P(Plugin.instantiate());
+    if (P->getActionType() == PluginASTAction::ReplaceAction) {
+      getFrontendOpts().ProgramAction = clang::frontend::PluginAction;
+      getFrontendOpts().ActionName = Plugin.getName().str();
+      break;
+    }
+  }
+}
+
+/// Determine the appropriate source input kind based on language
+/// options.
+static Language getLanguageFromOptions(const LangOptions &LangOpts) {
+  if (LangOpts.OpenCL)
+    return Language::OpenCL;
+  if (LangOpts.CUDA)
+    return Language::CUDA;
+  if (LangOpts.ObjC)
+    return LangOpts.CPlusPlus ? Language::ObjCXX : Language::ObjC;
+  return LangOpts.CPlusPlus ? Language::CXX : Language::C;
+}
+
+/// Compile a module file for the given module, using the options
+/// provided by the importing compiler instance. Returns true if the module
+/// was built without errors.
+static bool
+compileModuleImpl(CompilerInstance &ImportingInstance, SourceLocation ImportLoc,
+                  StringRef ModuleName, FrontendInputFile Input,
+                  StringRef OriginalModuleMapFile, StringRef ModuleFileName,
+                  llvm::function_ref<void(CompilerInstance &)> PreBuildStep =
+                      [](CompilerInstance &) {},
+                  llvm::function_ref<void(CompilerInstance &)> PostBuildStep =
+                      [](CompilerInstance &) {}) {
+  llvm::TimeTraceScope TimeScope("Module Compile", ModuleName);
+
+  // Never compile a module that's already finalized - this would cause the
+  // existing module to be freed, causing crashes if it is later referenced
+  if (ImportingInstance.getModuleCache().isPCMFinal(ModuleFileName)) {
+    ImportingInstance.getDiagnostics().Report(
+        ImportLoc, diag::err_module_rebuild_finalized)
+        << ModuleName;
+    return false;
+  }
+
+  // Construct a compiler invocation for creating this module.
+  auto Invocation =
+      std::make_shared<CompilerInvocation>(ImportingInstance.getInvocation());
+
+  PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
+
+  // For any options that aren't intended to affect how a module is built,
+  // reset them to their default values.
+  Invocation->getLangOpts()->resetNonModularOptions();
+  PPOpts.resetNonModularOptions();
+
+  // Remove any macro definitions that are explicitly ignored by the module.
+  // They aren't supposed to affect how the module is built anyway.
+  HeaderSearchOptions &HSOpts = Invocation->getHeaderSearchOpts();
+  llvm::erase_if(PPOpts.Macros,
+                 [&HSOpts](const std::pair<std::string, bool> &def) {
+                   StringRef MacroDef = def.first;
+                   return HSOpts.ModulesIgnoreMacros.contains(
+                       llvm::CachedHashString(MacroDef.split('=').first));
+                 });
+
+  // If the original compiler invocation had -fmodule-name, pass it through.
+  Invocation->getLangOpts()->ModuleName =
+      ImportingInstance.getInvocation().getLangOpts()->ModuleName;
+
+  // Note the name of the module we're building.
+  Invocation->getLangOpts()->CurrentModule = std::string(ModuleName);
+
+  // Make sure that the failed-module structure has been allocated in
+  // the importing instance, and propagate the pointer to the newly-created
+  // instance.
+  PreprocessorOptions &ImportingPPOpts
+    = ImportingInstance.getInvocation().getPreprocessorOpts();
+  if (!ImportingPPOpts.FailedModules)
+    ImportingPPOpts.FailedModules =
+        std::make_shared<PreprocessorOptions::FailedModulesSet>();
+  PPOpts.FailedModules = ImportingPPOpts.FailedModules;
+
+  // If there is a module map file, build the module using the module map.
+  // Set up the inputs/outputs so that we build the module from its umbrella
+  // header.
+  FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
+  FrontendOpts.OutputFile = ModuleFileName.str();
+  FrontendOpts.DisableFree = false;
+  FrontendOpts.GenerateGlobalModuleIndex = false;
+  FrontendOpts.BuildingImplicitModule = true;
+  FrontendOpts.OriginalModuleMap = std::string(OriginalModuleMapFile);
+  // Force implicitly-built modules to hash the content of the module file.
+  HSOpts.ModulesHashContent = true;
+  FrontendOpts.Inputs = {Input};
+
+  // Don't free the remapped file buffers; they are owned by our caller.
+  PPOpts.RetainRemappedFileBuffers = true;
+
+  Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
+  assert(ImportingInstance.getInvocation().getModuleHash() ==
+         Invocation->getModuleHash() && "Module hash mismatch!");
+
+  // Construct a compiler instance that will be used to actually create the
+  // module.  Since we're sharing an in-memory module cache,
+  // CompilerInstance::CompilerInstance is responsible for finalizing the
+  // buffers to prevent use-after-frees.
+  CompilerInstance Instance(ImportingInstance.getPCHContainerOperations(),
+                            &ImportingInstance.getModuleCache());
+  auto &Inv = *Invocation;
+  Instance.setInvocation(std::move(Invocation));
+
+  Instance.createDiagnostics(new ForwardingDiagnosticConsumer(
+                                   ImportingInstance.getDiagnosticClient()),
+                             /*ShouldOwnClient=*/true);
+
+  // Note that this module is part of the module build stack, so that we
+  // can detect cycles in the module graph.
+  Instance.setFileManager(&ImportingInstance.getFileManager());
+  Instance.createSourceManager(Instance.getFileManager());
+  SourceManager &SourceMgr = Instance.getSourceManager();
+  SourceMgr.setModuleBuildStack(
+    ImportingInstance.getSourceManager().getModuleBuildStack());
+  SourceMgr.pushModuleBuildStack(ModuleName,
+    FullSourceLoc(ImportLoc, ImportingInstance.getSourceManager()));
+
+  // If we're collecting module dependencies, we need to share a collector
+  // between all of the module CompilerInstances. Other than that, we don't
+  // want to produce any dependency output from the module build.
+  Instance.setModuleDepCollector(ImportingInstance.getModuleDepCollector());
+  Inv.getDependencyOutputOpts() = DependencyOutputOptions();
+
+  ImportingInstance.getDiagnostics().Report(ImportLoc,
+                                            diag::remark_module_build)
+    << ModuleName << ModuleFileName;
+
+  PreBuildStep(Instance);
+
+  // Execute the action to actually build the module in-place. Use a separate
+  // thread so that we get a stack large enough.
+  llvm::CrashRecoveryContext CRC;
+  CRC.RunSafelyOnThread(
+      [&]() {
+        GenerateModuleFromModuleMapAction Action;
+        Instance.ExecuteAction(Action);
+      },
+      DesiredStackSize);
+
+  PostBuildStep(Instance);
+
+  ImportingInstance.getDiagnostics().Report(ImportLoc,
+                                            diag::remark_module_build_done)
+    << ModuleName;
+
+  // Delete any remaining temporary files related to Instance, in case the
+  // module generation thread crashed.
+  Instance.clearOutputFiles(/*EraseFiles=*/true);
+
+  // If \p AllowPCMWithCompilerErrors is set return 'success' even if errors
+  // occurred.
+  return !Instance.getDiagnostics().hasErrorOccurred() ||
+         Instance.getFrontendOpts().AllowPCMWithCompilerErrors;
+}
+
+static const FileEntry *getPublicModuleMap(const FileEntry *File,
+                                           FileManager &FileMgr) {
+  StringRef Filename = llvm::sys::path::filename(File->getName());
+  SmallString<128> PublicFilename(File->getDir()->getName());
+  if (Filename == "module_private.map")
+    llvm::sys::path::append(PublicFilename, "module.map");
+  else if (Filename == "module.private.modulemap")
+    llvm::sys::path::append(PublicFilename, "module.modulemap");
+  else
+    return nullptr;
+  if (auto FE = FileMgr.getFile(PublicFilename))
+    return *FE;
+  return nullptr;
+}
+
+/// Compile a module file for the given module in a separate compiler instance,
+/// using the options provided by the importing compiler instance. Returns true
+/// if the module was built without errors.
+static bool compileModule(CompilerInstance &ImportingInstance,
+                          SourceLocation ImportLoc, Module *Module,
+                          StringRef ModuleFileName) {
+  InputKind IK(getLanguageFromOptions(ImportingInstance.getLangOpts()),
+               InputKind::ModuleMap);
+
+  // Get or create the module map that we'll use to build this module.
+  ModuleMap &ModMap
+    = ImportingInstance.getPreprocessor().getHeaderSearchInfo().getModuleMap();
+  bool Result;
+  if (const FileEntry *ModuleMapFile =
+          ModMap.getContainingModuleMapFile(Module)) {
+    // Canonicalize compilation to start with the public module map. This is
+    // vital for submodules declarations in the private module maps to be
+    // correctly parsed when depending on a top level module in the public one.
+    if (const FileEntry *PublicMMFile = getPublicModuleMap(
+            ModuleMapFile, ImportingInstance.getFileManager()))
+      ModuleMapFile = PublicMMFile;
+
+    // Use the module map where this module resides.
+    Result = compileModuleImpl(
+        ImportingInstance, ImportLoc, Module->getTopLevelModuleName(),
+        FrontendInputFile(ModuleMapFile->getName(), IK, +Module->IsSystem),
+        ModMap.getModuleMapFileForUniquing(Module)->getName(),
+        ModuleFileName);
+  } else {
+    // FIXME: We only need to fake up an input file here as a way of
+    // transporting the module's directory to the module map parser. We should
+    // be able to do that more directly, and parse from a memory buffer without
+    // inventing this file.
+    SmallString<128> FakeModuleMapFile(Module->Directory->getName());
+    llvm::sys::path::append(FakeModuleMapFile, "__inferred_module.map");
+
+    std::string InferredModuleMapContent;
+    llvm::raw_string_ostream OS(InferredModuleMapContent);
+    Module->print(OS);
+    OS.flush();
+
+    Result = compileModuleImpl(
+        ImportingInstance, ImportLoc, Module->getTopLevelModuleName(),
+        FrontendInputFile(FakeModuleMapFile, IK, +Module->IsSystem),
+        ModMap.getModuleMapFileForUniquing(Module)->getName(),
+        ModuleFileName,
+        [&](CompilerInstance &Instance) {
+      std::unique_ptr<llvm::MemoryBuffer> ModuleMapBuffer =
+          llvm::MemoryBuffer::getMemBuffer(InferredModuleMapContent);
+      ModuleMapFile = Instance.getFileManager().getVirtualFile(
+          FakeModuleMapFile, InferredModuleMapContent.size(), 0);
+      Instance.getSourceManager().overrideFileContents(
+          ModuleMapFile, std::move(ModuleMapBuffer));
+    });
+  }
+
+  // We've rebuilt a module. If we're allowed to generate or update the global
+  // module index, record that fact in the importing compiler instance.
+  if (ImportingInstance.getFrontendOpts().GenerateGlobalModuleIndex) {
+    ImportingInstance.setBuildGlobalModuleIndex(true);
+  }
+
+  return Result;
+}
+
+/// Read the AST right after compiling the module.
+static bool readASTAfterCompileModule(CompilerInstance &ImportingInstance,
+                                      SourceLocation ImportLoc,
+                                      SourceLocation ModuleNameLoc,
+                                      Module *Module, StringRef ModuleFileName,
+                                      bool *OutOfDate) {
+  DiagnosticsEngine &Diags = ImportingInstance.getDiagnostics();
+
+  unsigned ModuleLoadCapabilities = ASTReader::ARR_Missing;
+  if (OutOfDate)
+    ModuleLoadCapabilities |= ASTReader::ARR_OutOfDate;
+
+  // Try to read the module file, now that we've compiled it.
+  ASTReader::ASTReadResult ReadResult =
+      ImportingInstance.getASTReader()->ReadAST(
+          ModuleFileName, serialization::MK_ImplicitModule, ImportLoc,
+          ModuleLoadCapabilities);
+  if (ReadResult == ASTReader::Success)
+    return true;
+
+  // The caller wants to handle out-of-date failures.
+  if (OutOfDate && ReadResult == ASTReader::OutOfDate) {
+    *OutOfDate = true;
+    return false;
+  }
+
+  // The ASTReader didn't diagnose the error, so conservatively report it.
+  if (ReadResult == ASTReader::Missing || !Diags.hasErrorOccurred())
+    Diags.Report(ModuleNameLoc, diag::err_module_not_built)
+      << Module->Name << SourceRange(ImportLoc, ModuleNameLoc);
+
+  return false;
+}
+
+/// Compile a module in a separate compiler instance and read the AST,
+/// returning true if the module compiles without errors.
+static bool compileModuleAndReadASTImpl(CompilerInstance &ImportingInstance,
+                                        SourceLocation ImportLoc,
+                                        SourceLocation ModuleNameLoc,
+                                        Module *Module,
+                                        StringRef ModuleFileName) {
+  if (!compileModule(ImportingInstance, ModuleNameLoc, Module,
+                     ModuleFileName)) {
+    ImportingInstance.getDiagnostics().Report(ModuleNameLoc,
+                                              diag::err_module_not_built)
+        << Module->Name << SourceRange(ImportLoc, ModuleNameLoc);
+    return false;
+  }
+
+  return readASTAfterCompileModule(ImportingInstance, ImportLoc, ModuleNameLoc,
+                                   Module, ModuleFileName,
+                                   /*OutOfDate=*/nullptr);
+}
+
+/// Compile a module in a separate compiler instance and read the AST,
+/// returning true if the module compiles without errors, using a lock manager
+/// to avoid building the same module in multiple compiler instances.
+///
+/// Uses a lock file manager and exponential backoff to reduce the chances that
+/// multiple instances will compete to create the same module.  On timeout,
+/// deletes the lock file in order to avoid deadlock from crashing processes or
+/// bugs in the lock file manager.
+static bool compileModuleAndReadASTBehindLock(
+    CompilerInstance &ImportingInstance, SourceLocation ImportLoc,
+    SourceLocation ModuleNameLoc, Module *Module, StringRef ModuleFileName) {
+  DiagnosticsEngine &Diags = ImportingInstance.getDiagnostics();
+
+  Diags.Report(ModuleNameLoc, diag::remark_module_lock)
+      << ModuleFileName << Module->Name;
+
+  // FIXME: have LockFileManager return an error_code so that we can
+  // avoid the mkdir when the directory already exists.
+  StringRef Dir = llvm::sys::path::parent_path(ModuleFileName);
+  llvm::sys::fs::create_directories(Dir);
+
+  while (true) {
+    llvm::LockFileManager Locked(ModuleFileName);
+    switch (Locked) {
+    case llvm::LockFileManager::LFS_Error:
+      // ModuleCache takes care of correctness and locks are only necessary for
+      // performance. Fallback to building the module in case of any lock
+      // related errors.
+      Diags.Report(ModuleNameLoc, diag::remark_module_lock_failure)
+          << Module->Name << Locked.getErrorMessage();
+      // Clear out any potential leftover.
+      Locked.unsafeRemoveLockFile();
+      LLVM_FALLTHROUGH;
+    case llvm::LockFileManager::LFS_Owned:
+      // We're responsible for building the module ourselves.
+      return compileModuleAndReadASTImpl(ImportingInstance, ImportLoc,
+                                         ModuleNameLoc, Module, ModuleFileName);
+
+    case llvm::LockFileManager::LFS_Shared:
+      break; // The interesting case.
+    }
+
+    // Someone else is responsible for building the module. Wait for them to
+    // finish.
+    switch (Locked.waitForUnlock()) {
+    case llvm::LockFileManager::Res_Success:
+      break; // The interesting case.
+    case llvm::LockFileManager::Res_OwnerDied:
+      continue; // try again to get the lock.
+    case llvm::LockFileManager::Res_Timeout:
+      // Since ModuleCache takes care of correctness, we try waiting for
+      // another process to complete the build so clang does not do it done
+      // twice. If case of timeout, build it ourselves.
+      Diags.Report(ModuleNameLoc, diag::remark_module_lock_timeout)
+          << Module->Name;
+      // Clear the lock file so that future invocations can make progress.
+      Locked.unsafeRemoveLockFile();
+      continue;
+    }
+
+    // Read the module that was just written by someone else.
+    bool OutOfDate = false;
+    if (readASTAfterCompileModule(ImportingInstance, ImportLoc, ModuleNameLoc,
+                                  Module, ModuleFileName, &OutOfDate))
+      return true;
+    if (!OutOfDate)
+      return false;
+
+    // The module may be out of date in the presence of file system races,
+    // or if one of its imports depends on header search paths that are not
+    // consistent with this ImportingInstance.  Try again...
+  }
+}
+
+/// Compile a module in a separate compiler instance and read the AST,
+/// returning true if the module compiles without errors, potentially using a
+/// lock manager to avoid building the same module in multiple compiler
+/// instances.
+static bool compileModuleAndReadAST(CompilerInstance &ImportingInstance,
+                                    SourceLocation ImportLoc,
+                                    SourceLocation ModuleNameLoc,
+                                    Module *Module, StringRef ModuleFileName) {
+  return ImportingInstance.getInvocation()
+                 .getFrontendOpts()
+                 .BuildingImplicitModuleUsesLock
+             ? compileModuleAndReadASTBehindLock(ImportingInstance, ImportLoc,
+                                                 ModuleNameLoc, Module,
+                                                 ModuleFileName)
+             : compileModuleAndReadASTImpl(ImportingInstance, ImportLoc,
+                                           ModuleNameLoc, Module,
+                                           ModuleFileName);
+}
+
+/// Diagnose differences between the current definition of the given
+/// configuration macro and the definition provided on the command line.
+static void checkConfigMacro(Preprocessor &PP, StringRef ConfigMacro,
+                             Module *Mod, SourceLocation ImportLoc) {
+  IdentifierInfo *Id = PP.getIdentifierInfo(ConfigMacro);
+  SourceManager &SourceMgr = PP.getSourceManager();
+
+  // If this identifier has never had a macro definition, then it could
+  // not have changed.
+  if (!Id->hadMacroDefinition())
+    return;
+  auto *LatestLocalMD = PP.getLocalMacroDirectiveHistory(Id);
+
+  // Find the macro definition from the command line.
+  MacroInfo *CmdLineDefinition = nullptr;
+  for (auto *MD = LatestLocalMD; MD; MD = MD->getPrevious()) {
+    // We only care about the predefines buffer.
+    FileID FID = SourceMgr.getFileID(MD->getLocation());
+    if (FID.isInvalid() || FID != PP.getPredefinesFileID())
+      continue;
+    if (auto *DMD = dyn_cast<DefMacroDirective>(MD))
+      CmdLineDefinition = DMD->getMacroInfo();
+    break;
+  }
+
+  auto *CurrentDefinition = PP.getMacroInfo(Id);
+  if (CurrentDefinition == CmdLineDefinition) {
+    // Macro matches. Nothing to do.
+  } else if (!CurrentDefinition) {
+    // This macro was defined on the command line, then #undef'd later.
+    // Complain.
+    PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
+      << true << ConfigMacro << Mod->getFullModuleName();
+    auto LatestDef = LatestLocalMD->getDefinition();
+    assert(LatestDef.isUndefined() &&
+           "predefined macro went away with no #undef?");
+    PP.Diag(LatestDef.getUndefLocation(), diag::note_module_def_undef_here)
+      << true;
+    return;
+  } else if (!CmdLineDefinition) {
+    // There was no definition for this macro in the predefines buffer,
+    // but there was a local definition. Complain.
+    PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
+      << false << ConfigMacro << Mod->getFullModuleName();
+    PP.Diag(CurrentDefinition->getDefinitionLoc(),
+            diag::note_module_def_undef_here)
+      << false;
+  } else if (!CurrentDefinition->isIdenticalTo(*CmdLineDefinition, PP,
+                                               /*Syntactically=*/true)) {
+    // The macro definitions differ.
+    PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
+      << false << ConfigMacro << Mod->getFullModuleName();
+    PP.Diag(CurrentDefinition->getDefinitionLoc(),
+            diag::note_module_def_undef_here)
+      << false;
+  }
+}
+
+/// Write a new timestamp file with the given path.
+static void writeTimestampFile(StringRef TimestampFile) {
+  std::error_code EC;
+  llvm::raw_fd_ostream Out(TimestampFile.str(), EC, llvm::sys::fs::OF_None);
+}
+
+/// Prune the module cache of modules that haven't been accessed in
+/// a long time.
+static void pruneModuleCache(const HeaderSearchOptions &HSOpts) {
+  llvm::sys::fs::file_status StatBuf;
+  llvm::SmallString<128> TimestampFile;
+  TimestampFile = HSOpts.ModuleCachePath;
+  assert(!TimestampFile.empty());
+  llvm::sys::path::append(TimestampFile, "modules.timestamp");
+
+  // Try to stat() the timestamp file.
+  if (std::error_code EC = llvm::sys::fs::status(TimestampFile, StatBuf)) {
+    // If the timestamp file wasn't there, create one now.
+    if (EC == std::errc::no_such_file_or_directory) {
+      writeTimestampFile(TimestampFile);
+    }
+    return;
+  }
+
+  // Check whether the time stamp is older than our pruning interval.
+  // If not, do nothing.
+  time_t TimeStampModTime =
+      llvm::sys::toTimeT(StatBuf.getLastModificationTime());
+  time_t CurrentTime = time(nullptr);
+  if (CurrentTime - TimeStampModTime <= time_t(HSOpts.ModuleCachePruneInterval))
+    return;
+
+  // Write a new timestamp file so that nobody else attempts to prune.
+  // There is a benign race condition here, if two Clang instances happen to
+  // notice at the same time that the timestamp is out-of-date.
+  writeTimestampFile(TimestampFile);
+
+  // Walk the entire module cache, looking for unused module files and module
+  // indices.
+  std::error_code EC;
+  SmallString<128> ModuleCachePathNative;
+  llvm::sys::path::native(HSOpts.ModuleCachePath, ModuleCachePathNative);
+  for (llvm::sys::fs::directory_iterator Dir(ModuleCachePathNative, EC), DirEnd;
+       Dir != DirEnd && !EC; Dir.increment(EC)) {
+    // If we don't have a directory, there's nothing to look into.
+    if (!llvm::sys::fs::is_directory(Dir->path()))
+      continue;
+
+    // Walk all of the files within this directory.
+    for (llvm::sys::fs::directory_iterator File(Dir->path(), EC), FileEnd;
+         File != FileEnd && !EC; File.increment(EC)) {
+      // We only care about module and global module index files.
+      StringRef Extension = llvm::sys::path::extension(File->path());
+      if (Extension != ".pcm" && Extension != ".timestamp" &&
+          llvm::sys::path::filename(File->path()) != "modules.idx")
+        continue;
+
+      // Look at this file. If we can't stat it, there's nothing interesting
+      // there.
+      if (llvm::sys::fs::status(File->path(), StatBuf))
+        continue;
+
+      // If the file has been used recently enough, leave it there.
+      time_t FileAccessTime = llvm::sys::toTimeT(StatBuf.getLastAccessedTime());
+      if (CurrentTime - FileAccessTime <=
+              time_t(HSOpts.ModuleCachePruneAfter)) {
+        continue;
+      }
+
+      // Remove the file.
+      llvm::sys::fs::remove(File->path());
+
+      // Remove the timestamp file.
+      std::string TimpestampFilename = File->path() + ".timestamp";
+      llvm::sys::fs::remove(TimpestampFilename);
+    }
+
+    // If we removed all of the files in the directory, remove the directory
+    // itself.
+    if (llvm::sys::fs::directory_iterator(Dir->path(), EC) ==
+            llvm::sys::fs::directory_iterator() && !EC)
+      llvm::sys::fs::remove(Dir->path());
+  }
+}
+
+void CompilerInstance::createASTReader() {
+  if (TheASTReader)
+    return;
+
+  if (!hasASTContext())
+    createASTContext();
+
+  // If we're implicitly building modules but not currently recursively
+  // building a module, check whether we need to prune the module cache.
+  if (getSourceManager().getModuleBuildStack().empty() &&
+      !getPreprocessor().getHeaderSearchInfo().getModuleCachePath().empty() &&
+      getHeaderSearchOpts().ModuleCachePruneInterval > 0 &&
+      getHeaderSearchOpts().ModuleCachePruneAfter > 0) {
+    pruneModuleCache(getHeaderSearchOpts());
+  }
+
+  HeaderSearchOptions &HSOpts = getHeaderSearchOpts();
+  std::string Sysroot = HSOpts.Sysroot;
+  const PreprocessorOptions &PPOpts = getPreprocessorOpts();
+  const FrontendOptions &FEOpts = getFrontendOpts();
+  std::unique_ptr<llvm::Timer> ReadTimer;
+
+  if (FrontendTimerGroup)
+    ReadTimer = std::make_unique<llvm::Timer>("reading_modules",
+                                                "Reading modules",
+                                                *FrontendTimerGroup);
+  TheASTReader = new ASTReader(
+      getPreprocessor(), getModuleCache(), &getASTContext(),
+      getPCHContainerReader(), getFrontendOpts().ModuleFileExtensions,
+      Sysroot.empty() ? "" : Sysroot.c_str(),
+      PPOpts.DisablePCHOrModuleValidation,
+      /*AllowASTWithCompilerErrors=*/FEOpts.AllowPCMWithCompilerErrors,
+      /*AllowConfigurationMismatch=*/false, HSOpts.ModulesValidateSystemHeaders,
+      HSOpts.ValidateASTInputFilesContent,
+      getFrontendOpts().UseGlobalModuleIndex, std::move(ReadTimer));
+  if (hasASTConsumer()) {
+    TheASTReader->setDeserializationListener(
+        getASTConsumer().GetASTDeserializationListener());
+    getASTContext().setASTMutationListener(
+      getASTConsumer().GetASTMutationListener());
+  }
+  getASTContext().setExternalSource(TheASTReader);
+  if (hasSema())
+    TheASTReader->InitializeSema(getSema());
+  if (hasASTConsumer())
+    TheASTReader->StartTranslationUnit(&getASTConsumer());
+
+  for (auto &Listener : DependencyCollectors)
+    Listener->attachToASTReader(*TheASTReader);
+}
+
+bool CompilerInstance::loadModuleFile(StringRef FileName) {
+  llvm::Timer Timer;
+  if (FrontendTimerGroup)
+    Timer.init("preloading." + FileName.str(), "Preloading " + FileName.str(),
+               *FrontendTimerGroup);
+  llvm::TimeRegion TimeLoading(FrontendTimerGroup ? &Timer : nullptr);
+
+  // If we don't already have an ASTReader, create one now.
+  if (!TheASTReader)
+    createASTReader();
+
+  // If -Wmodule-file-config-mismatch is mapped as an error or worse, allow the
+  // ASTReader to diagnose it, since it can produce better errors that we can.
+  bool ConfigMismatchIsRecoverable =
+      getDiagnostics().getDiagnosticLevel(diag::warn_module_config_mismatch,
+                                          SourceLocation())
+        <= DiagnosticsEngine::Warning;
+
+  auto Listener = std::make_unique<ReadModuleNames>(*PP);
+  auto &ListenerRef = *Listener;
+  ASTReader::ListenerScope ReadModuleNamesListener(*TheASTReader,
+                                                   std::move(Listener));
+
+  // Try to load the module file.
+  switch (TheASTReader->ReadAST(
+      FileName, serialization::MK_ExplicitModule, SourceLocation(),
+      ConfigMismatchIsRecoverable ? ASTReader::ARR_ConfigurationMismatch : 0)) {
+  case ASTReader::Success:
+    // We successfully loaded the module file; remember the set of provided
+    // modules so that we don't try to load implicit modules for them.
+    ListenerRef.registerAll();
+    return true;
+
+  case ASTReader::ConfigurationMismatch:
+    // Ignore unusable module files.
+    getDiagnostics().Report(SourceLocation(), diag::warn_module_config_mismatch)
+        << FileName;
+    // All modules provided by any files we tried and failed to load are now
+    // unavailable; includes of those modules should now be handled textually.
+    ListenerRef.markAllUnavailable();
+    return true;
+
+  default:
+    return false;
+  }
+}
+
+namespace {
+enum ModuleSource {
+  MS_ModuleNotFound,
+  MS_ModuleCache,
+  MS_PrebuiltModulePath,
+  MS_ModuleBuildPragma
+};
+} // end namespace
+
+/// Select a source for loading the named module and compute the filename to
+/// load it from.
+static ModuleSource selectModuleSource(
+    Module *M, StringRef ModuleName, std::string &ModuleFilename,
+    const std::map<std::string, std::string, std::less<>> &BuiltModules,
+    HeaderSearch &HS) {
+  assert(ModuleFilename.empty() && "Already has a module source?");
+
+  // Check to see if the module has been built as part of this compilation
+  // via a module build pragma.
+  auto BuiltModuleIt = BuiltModules.find(ModuleName);
+  if (BuiltModuleIt != BuiltModules.end()) {
+    ModuleFilename = BuiltModuleIt->second;
+    return MS_ModuleBuildPragma;
+  }
+
+  // Try to load the module from the prebuilt module path.
+  const HeaderSearchOptions &HSOpts = HS.getHeaderSearchOpts();
+  if (!HSOpts.PrebuiltModuleFiles.empty() ||
+      !HSOpts.PrebuiltModulePaths.empty()) {
+    ModuleFilename = HS.getPrebuiltModuleFileName(ModuleName);
+    if (HSOpts.EnablePrebuiltImplicitModules && ModuleFilename.empty())
+      ModuleFilename = HS.getPrebuiltImplicitModuleFileName(M);
+    if (!ModuleFilename.empty())
+      return MS_PrebuiltModulePath;
+  }
+
+  // Try to load the module from the module cache.
+  if (M) {
+    ModuleFilename = HS.getCachedModuleFileName(M);
+    return MS_ModuleCache;
+  }
+
+  return MS_ModuleNotFound;
+}
+
+ModuleLoadResult CompilerInstance::findOrCompileModuleAndReadAST(
+    StringRef ModuleName, SourceLocation ImportLoc,
+    SourceLocation ModuleNameLoc, bool IsInclusionDirective) {
+  // Search for a module with the given name.
+  HeaderSearch &HS = PP->getHeaderSearchInfo();
+  Module *M =
+      HS.lookupModule(ModuleName, ImportLoc, true, !IsInclusionDirective);
+
+  // Select the source and filename for loading the named module.
+  std::string ModuleFilename;
+  ModuleSource Source =
+      selectModuleSource(M, ModuleName, ModuleFilename, BuiltModules, HS);
+  if (Source == MS_ModuleNotFound) {
+    // We can't find a module, error out here.
+    getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_found)
+        << ModuleName << SourceRange(ImportLoc, ModuleNameLoc);
+    return nullptr;
+  }
+  if (ModuleFilename.empty()) {
+    if (M && M->HasIncompatibleModuleFile) {
+      // We tried and failed to load a module file for this module. Fall
+      // back to textual inclusion for its headers.
+      return ModuleLoadResult::ConfigMismatch;
+    }
+
+    getDiagnostics().Report(ModuleNameLoc, diag::err_module_build_disabled)
+        << ModuleName;
+    return nullptr;
+  }
+
+  // Create an ASTReader on demand.
+  if (!getASTReader())
+    createASTReader();
+
+  // Time how long it takes to load the module.
+  llvm::Timer Timer;
+  if (FrontendTimerGroup)
+    Timer.init("loading." + ModuleFilename, "Loading " + ModuleFilename,
+               *FrontendTimerGroup);
+  llvm::TimeRegion TimeLoading(FrontendTimerGroup ? &Timer : nullptr);
+  llvm::TimeTraceScope TimeScope("Module Load", ModuleName);
+
+  // Try to load the module file. If we are not trying to load from the
+  // module cache, we don't know how to rebuild modules.
+  unsigned ARRFlags = Source == MS_ModuleCache
+                          ? ASTReader::ARR_OutOfDate | ASTReader::ARR_Missing |
+                                ASTReader::ARR_TreatModuleWithErrorsAsOutOfDate
+                          : Source == MS_PrebuiltModulePath
+                                ? 0
+                                : ASTReader::ARR_ConfigurationMismatch;
+  switch (getASTReader()->ReadAST(ModuleFilename,
+                                  Source == MS_PrebuiltModulePath
+                                      ? serialization::MK_PrebuiltModule
+                                      : Source == MS_ModuleBuildPragma
+                                            ? serialization::MK_ExplicitModule
+                                            : serialization::MK_ImplicitModule,
+                                  ImportLoc, ARRFlags)) {
+  case ASTReader::Success: {
+    if (M)
+      return M;
+    assert(Source != MS_ModuleCache &&
+           "missing module, but file loaded from cache");
+
+    // A prebuilt module is indexed as a ModuleFile; the Module does not exist
+    // until the first call to ReadAST.  Look it up now.
+    M = HS.lookupModule(ModuleName, ImportLoc, true, !IsInclusionDirective);
+
+    // Check whether M refers to the file in the prebuilt module path.
+    if (M && M->getASTFile())
+      if (auto ModuleFile = FileMgr->getFile(ModuleFilename))
+        if (*ModuleFile == M->getASTFile())
+          return M;
+
+    getDiagnostics().Report(ModuleNameLoc, diag::err_module_prebuilt)
+        << ModuleName;
+    return ModuleLoadResult();
+  }
+
+  case ASTReader::OutOfDate:
+  case ASTReader::Missing:
+    // The most interesting case.
+    break;
+
+  case ASTReader::ConfigurationMismatch:
+    if (Source == MS_PrebuiltModulePath)
+      // FIXME: We shouldn't be setting HadFatalFailure below if we only
+      // produce a warning here!
+      getDiagnostics().Report(SourceLocation(),
+                              diag::warn_module_config_mismatch)
+          << ModuleFilename;
+    // Fall through to error out.
+    LLVM_FALLTHROUGH;
+  case ASTReader::VersionMismatch:
+  case ASTReader::HadErrors:
+    ModuleLoader::HadFatalFailure = true;
+    // FIXME: The ASTReader will already have complained, but can we shoehorn
+    // that diagnostic information into a more useful form?
+    return ModuleLoadResult();
+
+  case ASTReader::Failure:
+    ModuleLoader::HadFatalFailure = true;
+    return ModuleLoadResult();
+  }
+
+  // ReadAST returned Missing or OutOfDate.
+  if (Source != MS_ModuleCache) {
+    // We don't know the desired configuration for this module and don't
+    // necessarily even have a module map. Since ReadAST already produces
+    // diagnostics for these two cases, we simply error out here.
+    return ModuleLoadResult();
+  }
+
+  // The module file is missing or out-of-date. Build it.
+  assert(M && "missing module, but trying to compile for cache");
+
+  // Check whether there is a cycle in the module graph.
+  ModuleBuildStack ModPath = getSourceManager().getModuleBuildStack();
+  ModuleBuildStack::iterator Pos = ModPath.begin(), PosEnd = ModPath.end();
+  for (; Pos != PosEnd; ++Pos) {
+    if (Pos->first == ModuleName)
+      break;
+  }
+
+  if (Pos != PosEnd) {
+    SmallString<256> CyclePath;
+    for (; Pos != PosEnd; ++Pos) {
+      CyclePath += Pos->first;
+      CyclePath += " -> ";
+    }
+    CyclePath += ModuleName;
+
+    getDiagnostics().Report(ModuleNameLoc, diag::err_module_cycle)
+        << ModuleName << CyclePath;
+    return nullptr;
+  }
+
+  // Check whether we have already attempted to build this module (but
+  // failed).
+  if (getPreprocessorOpts().FailedModules &&
+      getPreprocessorOpts().FailedModules->hasAlreadyFailed(ModuleName)) {
+    getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_built)
+        << ModuleName << SourceRange(ImportLoc, ModuleNameLoc);
+    return nullptr;
+  }
+
+  // Try to compile and then read the AST.
+  if (!compileModuleAndReadAST(*this, ImportLoc, ModuleNameLoc, M,
+                               ModuleFilename)) {
+    assert(getDiagnostics().hasErrorOccurred() &&
+           "undiagnosed error in compileModuleAndReadAST");
+    if (getPreprocessorOpts().FailedModules)
+      getPreprocessorOpts().FailedModules->addFailed(ModuleName);
+    return nullptr;
+  }
+
+  // Okay, we've rebuilt and now loaded the module.
+  return M;
+}
+
+ModuleLoadResult
+CompilerInstance::loadModule(SourceLocation ImportLoc,
+                             ModuleIdPath Path,
+                             Module::NameVisibilityKind Visibility,
+                             bool IsInclusionDirective) {
+  // Determine what file we're searching from.
+  StringRef ModuleName = Path[0].first->getName();
+  SourceLocation ModuleNameLoc = Path[0].second;
+
+  // If we've already handled this import, just return the cached result.
+  // This one-element cache is important to eliminate redundant diagnostics
+  // when both the preprocessor and parser see the same import declaration.
+  if (ImportLoc.isValid() && LastModuleImportLoc == ImportLoc) {
+    // Make the named module visible.
+    if (LastModuleImportResult && ModuleName != getLangOpts().CurrentModule)
+      TheASTReader->makeModuleVisible(LastModuleImportResult, Visibility,
+                                      ImportLoc);
+    return LastModuleImportResult;
+  }
+
+  // If we don't already have information on this module, load the module now.
+  Module *Module = nullptr;
+  ModuleMap &MM = getPreprocessor().getHeaderSearchInfo().getModuleMap();
+  if (auto MaybeModule = MM.getCachedModuleLoad(*Path[0].first)) {
+    // Use the cached result, which may be nullptr.
+    Module = *MaybeModule;
+  } else if (ModuleName == getLangOpts().CurrentModule) {
+    // This is the module we're building.
+    Module = PP->getHeaderSearchInfo().lookupModule(
+        ModuleName, ImportLoc, /*AllowSearch*/ true,
+        /*AllowExtraModuleMapSearch*/ !IsInclusionDirective);
+    /// FIXME: perhaps we should (a) look for a module using the module name
+    //  to file map (PrebuiltModuleFiles) and (b) diagnose if still not found?
+    //if (Module == nullptr) {
+    //  getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_found)
+    //    << ModuleName;
+    //  DisableGeneratingGlobalModuleIndex = true;
+    //  return ModuleLoadResult();
+    //}
+    MM.cacheModuleLoad(*Path[0].first, Module);
+  } else {
+    ModuleLoadResult Result = findOrCompileModuleAndReadAST(
+        ModuleName, ImportLoc, ModuleNameLoc, IsInclusionDirective);
+    if (!Result.isNormal())
+      return Result;
+    if (!Result)
+      DisableGeneratingGlobalModuleIndex = true;
+    Module = Result;
+    MM.cacheModuleLoad(*Path[0].first, Module);
+  }
+
+  // If we never found the module, fail.  Otherwise, verify the module and link
+  // it up.
+  if (!Module)
+    return ModuleLoadResult();
+
+  // Verify that the rest of the module path actually corresponds to
+  // a submodule.
+  bool MapPrivateSubModToTopLevel = false;
+  for (unsigned I = 1, N = Path.size(); I != N; ++I) {
+    StringRef Name = Path[I].first->getName();
+    clang::Module *Sub = Module->findSubmodule(Name);
+
+    // If the user is requesting Foo.Private and it doesn't exist, try to
+    // match Foo_Private and emit a warning asking for the user to write
+    // @import Foo_Private instead. FIXME: remove this when existing clients
+    // migrate off of Foo.Private syntax.
+    if (!Sub && PP->getLangOpts().ImplicitModules && Name == "Private" &&
+        Module == Module->getTopLevelModule()) {
+      SmallString<128> PrivateModule(Module->Name);
+      PrivateModule.append("_Private");
+
+      SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> PrivPath;
+      auto &II = PP->getIdentifierTable().get(
+          PrivateModule, PP->getIdentifierInfo(Module->Name)->getTokenID());
+      PrivPath.push_back(std::make_pair(&II, Path[0].second));
+
+      if (PP->getHeaderSearchInfo().lookupModule(PrivateModule, ImportLoc, true,
+                                                 !IsInclusionDirective))
+        Sub = loadModule(ImportLoc, PrivPath, Visibility, IsInclusionDirective);
+      if (Sub) {
+        MapPrivateSubModToTopLevel = true;
+        if (!getDiagnostics().isIgnored(
+                diag::warn_no_priv_submodule_use_toplevel, ImportLoc)) {
+          getDiagnostics().Report(Path[I].second,
+                                  diag::warn_no_priv_submodule_use_toplevel)
+              << Path[I].first << Module->getFullModuleName() << PrivateModule
+              << SourceRange(Path[0].second, Path[I].second)
+              << FixItHint::CreateReplacement(SourceRange(Path[0].second),
+                                              PrivateModule);
+          getDiagnostics().Report(Sub->DefinitionLoc,
+                                  diag::note_private_top_level_defined);
+        }
+      }
+    }
+
+    if (!Sub) {
+      // Attempt to perform typo correction to find a module name that works.
+      SmallVector<StringRef, 2> Best;
+      unsigned BestEditDistance = (std::numeric_limits<unsigned>::max)();
+
+      for (class Module *SubModule : Module->submodules()) {
+        unsigned ED =
+            Name.edit_distance(SubModule->Name,
+                               /*AllowReplacements=*/true, BestEditDistance);
+        if (ED <= BestEditDistance) {
+          if (ED < BestEditDistance) {
+            Best.clear();
+            BestEditDistance = ED;
+          }
+
+          Best.push_back(SubModule->Name);
+        }
+      }
+
+      // If there was a clear winner, user it.
+      if (Best.size() == 1) {
+        getDiagnostics().Report(Path[I].second, diag::err_no_submodule_suggest)
+            << Path[I].first << Module->getFullModuleName() << Best[0]
+            << SourceRange(Path[0].second, Path[I - 1].second)
+            << FixItHint::CreateReplacement(SourceRange(Path[I].second),
+                                            Best[0]);
+
+        Sub = Module->findSubmodule(Best[0]);
+      }
+    }
+
+    if (!Sub) {
+      // No submodule by this name. Complain, and don't look for further
+      // submodules.
+      getDiagnostics().Report(Path[I].second, diag::err_no_submodule)
+          << Path[I].first << Module->getFullModuleName()
+          << SourceRange(Path[0].second, Path[I - 1].second);
+      break;
+    }
+
+    Module = Sub;
+  }
+
+  // Make the named module visible, if it's not already part of the module
+  // we are parsing.
+  if (ModuleName != getLangOpts().CurrentModule) {
+    if (!Module->IsFromModuleFile && !MapPrivateSubModToTopLevel) {
+      // We have an umbrella header or directory that doesn't actually include
+      // all of the headers within the directory it covers. Complain about
+      // this missing submodule and recover by forgetting that we ever saw
+      // this submodule.
+      // FIXME: Should we detect this at module load time? It seems fairly
+      // expensive (and rare).
+      getDiagnostics().Report(ImportLoc, diag::warn_missing_submodule)
+        << Module->getFullModuleName()
+        << SourceRange(Path.front().second, Path.back().second);
+
+      return ModuleLoadResult::MissingExpected;
+    }
+
+    // Check whether this module is available.
+    if (Preprocessor::checkModuleIsAvailable(getLangOpts(), getTarget(),
+                                             getDiagnostics(), Module)) {
+      getDiagnostics().Report(ImportLoc, diag::note_module_import_here)
+        << SourceRange(Path.front().second, Path.back().second);
+      LastModuleImportLoc = ImportLoc;
+      LastModuleImportResult = ModuleLoadResult();
+      return ModuleLoadResult();
+    }
+
+    TheASTReader->makeModuleVisible(Module, Visibility, ImportLoc);
+  }
+
+  // Check for any configuration macros that have changed.
+  clang::Module *TopModule = Module->getTopLevelModule();
+  for (unsigned I = 0, N = TopModule->ConfigMacros.size(); I != N; ++I) {
+    checkConfigMacro(getPreprocessor(), TopModule->ConfigMacros[I],
+                     Module, ImportLoc);
+  }
+
+  // Resolve any remaining module using export_as for this one.
+  getPreprocessor()
+      .getHeaderSearchInfo()
+      .getModuleMap()
+      .resolveLinkAsDependencies(TopModule);
+
+  LastModuleImportLoc = ImportLoc;
+  LastModuleImportResult = ModuleLoadResult(Module);
+  return LastModuleImportResult;
+}
+
+void CompilerInstance::createModuleFromSource(SourceLocation ImportLoc,
+                                              StringRef ModuleName,
+                                              StringRef Source) {
+  // Avoid creating filenames with special characters.
+  SmallString<128> CleanModuleName(ModuleName);
+  for (auto &C : CleanModuleName)
+    if (!isAlphanumeric(C))
+      C = '_';
+
+  // FIXME: Using a randomized filename here means that our intermediate .pcm
+  // output is nondeterministic (as .pcm files refer to each other by name).
+  // Can this affect the output in any way?
+  SmallString<128> ModuleFileName;
+  if (std::error_code EC = llvm::sys::fs::createTemporaryFile(
+          CleanModuleName, "pcm", ModuleFileName)) {
+    getDiagnostics().Report(ImportLoc, diag::err_fe_unable_to_open_output)
+        << ModuleFileName << EC.message();
+    return;
+  }
+  std::string ModuleMapFileName = (CleanModuleName + ".map").str();
+
+  FrontendInputFile Input(
+      ModuleMapFileName,
+      InputKind(getLanguageFromOptions(*Invocation->getLangOpts()),
+                InputKind::ModuleMap, /*Preprocessed*/true));
+
+  std::string NullTerminatedSource(Source.str());
+
+  auto PreBuildStep = [&](CompilerInstance &Other) {
+    // Create a virtual file containing our desired source.
+    // FIXME: We shouldn't need to do this.
+    const FileEntry *ModuleMapFile = Other.getFileManager().getVirtualFile(
+        ModuleMapFileName, NullTerminatedSource.size(), 0);
+    Other.getSourceManager().overrideFileContents(
+        ModuleMapFile, llvm::MemoryBuffer::getMemBuffer(NullTerminatedSource));
+
+    Other.BuiltModules = std::move(BuiltModules);
+    Other.DeleteBuiltModules = false;
+  };
+
+  auto PostBuildStep = [this](CompilerInstance &Other) {
+    BuiltModules = std::move(Other.BuiltModules);
+  };
+
+  // Build the module, inheriting any modules that we've built locally.
+  if (compileModuleImpl(*this, ImportLoc, ModuleName, Input, StringRef(),
+                        ModuleFileName, PreBuildStep, PostBuildStep)) {
+    BuiltModules[std::string(ModuleName)] = std::string(ModuleFileName.str());
+    llvm::sys::RemoveFileOnSignal(ModuleFileName);
+  }
+}
+
+void CompilerInstance::makeModuleVisible(Module *Mod,
+                                         Module::NameVisibilityKind Visibility,
+                                         SourceLocation ImportLoc) {
+  if (!TheASTReader)
+    createASTReader();
+  if (!TheASTReader)
+    return;
+
+  TheASTReader->makeModuleVisible(Mod, Visibility, ImportLoc);
+}
+
+GlobalModuleIndex *CompilerInstance::loadGlobalModuleIndex(
+    SourceLocation TriggerLoc) {
+  if (getPreprocessor().getHeaderSearchInfo().getModuleCachePath().empty())
+    return nullptr;
+  if (!TheASTReader)
+    createASTReader();
+  // Can't do anything if we don't have the module manager.
+  if (!TheASTReader)
+    return nullptr;
+  // Get an existing global index.  This loads it if not already
+  // loaded.
+  TheASTReader->loadGlobalIndex();
+  GlobalModuleIndex *GlobalIndex = TheASTReader->getGlobalIndex();
+  // If the global index doesn't exist, create it.
+  if (!GlobalIndex && shouldBuildGlobalModuleIndex() && hasFileManager() &&
+      hasPreprocessor()) {
+    llvm::sys::fs::create_directories(
+      getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
+    if (llvm::Error Err = GlobalModuleIndex::writeIndex(
+            getFileManager(), getPCHContainerReader(),
+            getPreprocessor().getHeaderSearchInfo().getModuleCachePath())) {
+      // FIXME this drops the error on the floor. This code is only used for
+      // typo correction and drops more than just this one source of errors
+      // (such as the directory creation failure above). It should handle the
+      // error.
+      consumeError(std::move(Err));
+      return nullptr;
+    }
+    TheASTReader->resetForReload();
+    TheASTReader->loadGlobalIndex();
+    GlobalIndex = TheASTReader->getGlobalIndex();
+  }
+  // For finding modules needing to be imported for fixit messages,
+  // we need to make the global index cover all modules, so we do that here.
+  if (!HaveFullGlobalModuleIndex && GlobalIndex && !buildingModule()) {
+    ModuleMap &MMap = getPreprocessor().getHeaderSearchInfo().getModuleMap();
+    bool RecreateIndex = false;
+    for (ModuleMap::module_iterator I = MMap.module_begin(),
+        E = MMap.module_end(); I != E; ++I) {
+      Module *TheModule = I->second;
+      const FileEntry *Entry = TheModule->getASTFile();
+      if (!Entry) {
+        SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
+        Path.push_back(std::make_pair(
+            getPreprocessor().getIdentifierInfo(TheModule->Name), TriggerLoc));
+        std::reverse(Path.begin(), Path.end());
+        // Load a module as hidden.  This also adds it to the global index.
+        loadModule(TheModule->DefinitionLoc, Path, Module::Hidden, false);
+        RecreateIndex = true;
+      }
+    }
+    if (RecreateIndex) {
+      if (llvm::Error Err = GlobalModuleIndex::writeIndex(
+              getFileManager(), getPCHContainerReader(),
+              getPreprocessor().getHeaderSearchInfo().getModuleCachePath())) {
+        // FIXME As above, this drops the error on the floor.
+        consumeError(std::move(Err));
+        return nullptr;
+      }
+      TheASTReader->resetForReload();
+      TheASTReader->loadGlobalIndex();
+      GlobalIndex = TheASTReader->getGlobalIndex();
+    }
+    HaveFullGlobalModuleIndex = true;
+  }
+  return GlobalIndex;
+}
+
+// Check global module index for missing imports.
+bool
+CompilerInstance::lookupMissingImports(StringRef Name,
+                                       SourceLocation TriggerLoc) {
+  // Look for the symbol in non-imported modules, but only if an error
+  // actually occurred.
+  if (!buildingModule()) {
+    // Load global module index, or retrieve a previously loaded one.
+    GlobalModuleIndex *GlobalIndex = loadGlobalModuleIndex(
+      TriggerLoc);
+
+    // Only if we have a global index.
+    if (GlobalIndex) {
+      GlobalModuleIndex::HitSet FoundModules;
+
+      // Find the modules that reference the identifier.
+      // Note that this only finds top-level modules.
+      // We'll let diagnoseTypo find the actual declaration module.
+      if (GlobalIndex->lookupIdentifier(Name, FoundModules))
+        return true;
+    }
+  }
+
+  return false;
+}
+void CompilerInstance::resetAndLeakSema() { llvm::BuryPointer(takeSema()); }
+
+void CompilerInstance::setExternalSemaSource(
+    IntrusiveRefCntPtr<ExternalSemaSource> ESS) {
+  ExternalSemaSrc = std::move(ESS);
+}
diff --git a/contrib/libs/clang14/lib/Frontend/CompilerInvocation.cpp b/contrib/libs/clang14/lib/Frontend/CompilerInvocation.cpp
new file mode 100644
index 0000000000..e21132ed01
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/CompilerInvocation.cpp
@@ -0,0 +1,4716 @@
+//===- CompilerInvocation.cpp ---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/CompilerInvocation.h"
+#include "TestModuleFileExtension.h"
+#include "clang/Basic/Builtins.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/CodeGenOptions.h"
+#include "clang/Basic/CommentOptions.h"
+#include "clang/Basic/DebugInfoOptions.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticDriver.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Basic/ObjCRuntime.h"
+#include "clang/Basic/Sanitizers.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/TargetOptions.h"
+#include "clang/Basic/Version.h"
+#include "clang/Basic/Visibility.h"
+#include "clang/Basic/XRayInstr.h"
+#include "clang/Config/config.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/DriverDiagnostic.h"
+#include "clang/Driver/Options.h"
+#include "clang/Frontend/CommandLineSourceLoc.h"
+#include "clang/Frontend/DependencyOutputOptions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendOptions.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "clang/Frontend/MigratorOptions.h"
+#include "clang/Frontend/PreprocessorOutputOptions.h"
+#include "clang/Frontend/TextDiagnosticBuffer.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/HeaderSearchOptions.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Sema/CodeCompleteOptions.h"
+#include "clang/Serialization/ASTBitCodes.h"
+#include "clang/Serialization/ModuleFileExtension.h"
+#include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"
+#include "llvm/ADT/APInt.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/CachedHashString.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/FloatingPointMode.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/IR/DebugInfoMetadata.h"
+#include "llvm/Linker/Linker.h"
+#include "llvm/MC/MCTargetOptions.h"
+#include "llvm/Option/Arg.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Option/OptSpecifier.h"
+#include "llvm/Option/OptTable.h"
+#include "llvm/Option/Option.h"
+#include "llvm/ProfileData/InstrProfReader.h"
+#include "llvm/Remarks/HotnessThresholdParser.h"
+#include "llvm/Support/CodeGen.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/HashBuilder.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/Regex.h"
+#include "llvm/Support/VersionTuple.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetOptions.h"
+#include <algorithm>
+#include <atomic>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+#include <memory>
+#include <string>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+using namespace clang;
+using namespace driver;
+using namespace options;
+using namespace llvm::opt;
+
+//===----------------------------------------------------------------------===//
+// Initialization.
+//===----------------------------------------------------------------------===//
+
+CompilerInvocationRefBase::CompilerInvocationRefBase()
+    : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
+      DiagnosticOpts(new DiagnosticOptions()),
+      HeaderSearchOpts(new HeaderSearchOptions()),
+      PreprocessorOpts(new PreprocessorOptions()),
+      AnalyzerOpts(new AnalyzerOptions()) {}
+
+CompilerInvocationRefBase::CompilerInvocationRefBase(
+    const CompilerInvocationRefBase &X)
+    : LangOpts(new LangOptions(*X.getLangOpts())),
+      TargetOpts(new TargetOptions(X.getTargetOpts())),
+      DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
+      HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
+      PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())),
+      AnalyzerOpts(new AnalyzerOptions(*X.getAnalyzerOpts())) {}
+
+CompilerInvocationRefBase::CompilerInvocationRefBase(
+    CompilerInvocationRefBase &&X) = default;
+
+CompilerInvocationRefBase &
+CompilerInvocationRefBase::operator=(CompilerInvocationRefBase X) {
+  LangOpts.swap(X.LangOpts);
+  TargetOpts.swap(X.TargetOpts);
+  DiagnosticOpts.swap(X.DiagnosticOpts);
+  HeaderSearchOpts.swap(X.HeaderSearchOpts);
+  PreprocessorOpts.swap(X.PreprocessorOpts);
+  AnalyzerOpts.swap(X.AnalyzerOpts);
+  return *this;
+}
+
+CompilerInvocationRefBase &
+CompilerInvocationRefBase::operator=(CompilerInvocationRefBase &&X) = default;
+
+CompilerInvocationRefBase::~CompilerInvocationRefBase() = default;
+
+//===----------------------------------------------------------------------===//
+// Normalizers
+//===----------------------------------------------------------------------===//
+
+#define SIMPLE_ENUM_VALUE_TABLE
+#include "clang/Driver/Options.inc"
+#undef SIMPLE_ENUM_VALUE_TABLE
+
+static llvm::Optional<bool> normalizeSimpleFlag(OptSpecifier Opt,
+                                                unsigned TableIndex,
+                                                const ArgList &Args,
+                                                DiagnosticsEngine &Diags) {
+  if (Args.hasArg(Opt))
+    return true;
+  return None;
+}
+
+static Optional<bool> normalizeSimpleNegativeFlag(OptSpecifier Opt, unsigned,
+                                                  const ArgList &Args,
+                                                  DiagnosticsEngine &) {
+  if (Args.hasArg(Opt))
+    return false;
+  return None;
+}
+
+/// The tblgen-erated code passes in a fifth parameter of an arbitrary type, but
+/// denormalizeSimpleFlags never looks at it. Avoid bloating compile-time with
+/// unnecessary template instantiations and just ignore it with a variadic
+/// argument.
+static void denormalizeSimpleFlag(SmallVectorImpl<const char *> &Args,
+                                  const char *Spelling,
+                                  CompilerInvocation::StringAllocator,
+                                  Option::OptionClass, unsigned, /*T*/...) {
+  Args.push_back(Spelling);
+}
+
+template <typename T> static constexpr bool is_uint64_t_convertible() {
+  return !std::is_same<T, uint64_t>::value &&
+         llvm::is_integral_or_enum<T>::value;
+}
+
+template <typename T,
+          std::enable_if_t<!is_uint64_t_convertible<T>(), bool> = false>
+static auto makeFlagToValueNormalizer(T Value) {
+  return [Value](OptSpecifier Opt, unsigned, const ArgList &Args,
+                 DiagnosticsEngine &) -> Optional<T> {
+    if (Args.hasArg(Opt))
+      return Value;
+    return None;
+  };
+}
+
+template <typename T,
+          std::enable_if_t<is_uint64_t_convertible<T>(), bool> = false>
+static auto makeFlagToValueNormalizer(T Value) {
+  return makeFlagToValueNormalizer(uint64_t(Value));
+}
+
+static auto makeBooleanOptionNormalizer(bool Value, bool OtherValue,
+                                        OptSpecifier OtherOpt) {
+  return [Value, OtherValue, OtherOpt](OptSpecifier Opt, unsigned,
+                                       const ArgList &Args,
+                                       DiagnosticsEngine &) -> Optional<bool> {
+    if (const Arg *A = Args.getLastArg(Opt, OtherOpt)) {
+      return A->getOption().matches(Opt) ? Value : OtherValue;
+    }
+    return None;
+  };
+}
+
+static auto makeBooleanOptionDenormalizer(bool Value) {
+  return [Value](SmallVectorImpl<const char *> &Args, const char *Spelling,
+                 CompilerInvocation::StringAllocator, Option::OptionClass,
+                 unsigned, bool KeyPath) {
+    if (KeyPath == Value)
+      Args.push_back(Spelling);
+  };
+}
+
+static void denormalizeStringImpl(SmallVectorImpl<const char *> &Args,
+                                  const char *Spelling,
+                                  CompilerInvocation::StringAllocator SA,
+                                  Option::OptionClass OptClass, unsigned,
+                                  const Twine &Value) {
+  switch (OptClass) {
+  case Option::SeparateClass:
+  case Option::JoinedOrSeparateClass:
+  case Option::JoinedAndSeparateClass:
+    Args.push_back(Spelling);
+    Args.push_back(SA(Value));
+    break;
+  case Option::JoinedClass:
+  case Option::CommaJoinedClass:
+    Args.push_back(SA(Twine(Spelling) + Value));
+    break;
+  default:
+    llvm_unreachable("Cannot denormalize an option with option class "
+                     "incompatible with string denormalization.");
+  }
+}
+
+template <typename T>
+static void
+denormalizeString(SmallVectorImpl<const char *> &Args, const char *Spelling,
+                  CompilerInvocation::StringAllocator SA,
+                  Option::OptionClass OptClass, unsigned TableIndex, T Value) {
+  denormalizeStringImpl(Args, Spelling, SA, OptClass, TableIndex, Twine(Value));
+}
+
+static Optional<SimpleEnumValue>
+findValueTableByName(const SimpleEnumValueTable &Table, StringRef Name) {
+  for (int I = 0, E = Table.Size; I != E; ++I)
+    if (Name == Table.Table[I].Name)
+      return Table.Table[I];
+
+  return None;
+}
+
+static Optional<SimpleEnumValue>
+findValueTableByValue(const SimpleEnumValueTable &Table, unsigned Value) {
+  for (int I = 0, E = Table.Size; I != E; ++I)
+    if (Value == Table.Table[I].Value)
+      return Table.Table[I];
+
+  return None;
+}
+
+static llvm::Optional<unsigned> normalizeSimpleEnum(OptSpecifier Opt,
+                                                    unsigned TableIndex,
+                                                    const ArgList &Args,
+                                                    DiagnosticsEngine &Diags) {
+  assert(TableIndex < SimpleEnumValueTablesSize);
+  const SimpleEnumValueTable &Table = SimpleEnumValueTables[TableIndex];
+
+  auto *Arg = Args.getLastArg(Opt);
+  if (!Arg)
+    return None;
+
+  StringRef ArgValue = Arg->getValue();
+  if (auto MaybeEnumVal = findValueTableByName(Table, ArgValue))
+    return MaybeEnumVal->Value;
+
+  Diags.Report(diag::err_drv_invalid_value)
+      << Arg->getAsString(Args) << ArgValue;
+  return None;
+}
+
+static void denormalizeSimpleEnumImpl(SmallVectorImpl<const char *> &Args,
+                                      const char *Spelling,
+                                      CompilerInvocation::StringAllocator SA,
+                                      Option::OptionClass OptClass,
+                                      unsigned TableIndex, unsigned Value) {
+  assert(TableIndex < SimpleEnumValueTablesSize);
+  const SimpleEnumValueTable &Table = SimpleEnumValueTables[TableIndex];
+  if (auto MaybeEnumVal = findValueTableByValue(Table, Value)) {
+    denormalizeString(Args, Spelling, SA, OptClass, TableIndex,
+                      MaybeEnumVal->Name);
+  } else {
+    llvm_unreachable("The simple enum value was not correctly defined in "
+                     "the tablegen option description");
+  }
+}
+
+template <typename T>
+static void denormalizeSimpleEnum(SmallVectorImpl<const char *> &Args,
+                                  const char *Spelling,
+                                  CompilerInvocation::StringAllocator SA,
+                                  Option::OptionClass OptClass,
+                                  unsigned TableIndex, T Value) {
+  return denormalizeSimpleEnumImpl(Args, Spelling, SA, OptClass, TableIndex,
+                                   static_cast<unsigned>(Value));
+}
+
+static Optional<std::string> normalizeString(OptSpecifier Opt, int TableIndex,
+                                             const ArgList &Args,
+                                             DiagnosticsEngine &Diags) {
+  auto *Arg = Args.getLastArg(Opt);
+  if (!Arg)
+    return None;
+  return std::string(Arg->getValue());
+}
+
+template <typename IntTy>
+static Optional<IntTy> normalizeStringIntegral(OptSpecifier Opt, int,
+                                               const ArgList &Args,
+                                               DiagnosticsEngine &Diags) {
+  auto *Arg = Args.getLastArg(Opt);
+  if (!Arg)
+    return None;
+  IntTy Res;
+  if (StringRef(Arg->getValue()).getAsInteger(0, Res)) {
+    Diags.Report(diag::err_drv_invalid_int_value)
+        << Arg->getAsString(Args) << Arg->getValue();
+    return None;
+  }
+  return Res;
+}
+
+static Optional<std::vector<std::string>>
+normalizeStringVector(OptSpecifier Opt, int, const ArgList &Args,
+                      DiagnosticsEngine &) {
+  return Args.getAllArgValues(Opt);
+}
+
+static void denormalizeStringVector(SmallVectorImpl<const char *> &Args,
+                                    const char *Spelling,
+                                    CompilerInvocation::StringAllocator SA,
+                                    Option::OptionClass OptClass,
+                                    unsigned TableIndex,
+                                    const std::vector<std::string> &Values) {
+  switch (OptClass) {
+  case Option::CommaJoinedClass: {
+    std::string CommaJoinedValue;
+    if (!Values.empty()) {
+      CommaJoinedValue.append(Values.front());
+      for (const std::string &Value : llvm::drop_begin(Values, 1)) {
+        CommaJoinedValue.append(",");
+        CommaJoinedValue.append(Value);
+      }
+    }
+    denormalizeString(Args, Spelling, SA, Option::OptionClass::JoinedClass,
+                      TableIndex, CommaJoinedValue);
+    break;
+  }
+  case Option::JoinedClass:
+  case Option::SeparateClass:
+  case Option::JoinedOrSeparateClass:
+    for (const std::string &Value : Values)
+      denormalizeString(Args, Spelling, SA, OptClass, TableIndex, Value);
+    break;
+  default:
+    llvm_unreachable("Cannot denormalize an option with option class "
+                     "incompatible with string vector denormalization.");
+  }
+}
+
+static Optional<std::string> normalizeTriple(OptSpecifier Opt, int TableIndex,
+                                             const ArgList &Args,
+                                             DiagnosticsEngine &Diags) {
+  auto *Arg = Args.getLastArg(Opt);
+  if (!Arg)
+    return None;
+  return llvm::Triple::normalize(Arg->getValue());
+}
+
+template <typename T, typename U>
+static T mergeForwardValue(T KeyPath, U Value) {
+  return static_cast<T>(Value);
+}
+
+template <typename T, typename U> static T mergeMaskValue(T KeyPath, U Value) {
+  return KeyPath | Value;
+}
+
+template <typename T> static T extractForwardValue(T KeyPath) {
+  return KeyPath;
+}
+
+template <typename T, typename U, U Value>
+static T extractMaskValue(T KeyPath) {
+  return ((KeyPath & Value) == Value) ? static_cast<T>(Value) : T();
+}
+
+#define PARSE_OPTION_WITH_MARSHALLING(                                         \
+    ARGS, DIAGS, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,       \
+    IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)             \
+  if ((FLAGS)&options::CC1Option) {                                            \
+    KEYPATH = MERGER(KEYPATH, DEFAULT_VALUE);                                  \
+    if (IMPLIED_CHECK)                                                         \
+      KEYPATH = MERGER(KEYPATH, IMPLIED_VALUE);                                \
+    if (SHOULD_PARSE)                                                          \
+      if (auto MaybeValue = NORMALIZER(OPT_##ID, TABLE_INDEX, ARGS, DIAGS))    \
+        KEYPATH =                                                              \
+            MERGER(KEYPATH, static_cast<decltype(KEYPATH)>(*MaybeValue));      \
+  }
+
+// Capture the extracted value as a lambda argument to avoid potential issues
+// with lifetime extension of the reference.
+#define GENERATE_OPTION_WITH_MARSHALLING(                                      \
+    ARGS, STRING_ALLOCATOR, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH,       \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR,      \
+    TABLE_INDEX)                                                               \
+  if ((FLAGS)&options::CC1Option) {                                            \
+    [&](const auto &Extracted) {                                               \
+      if (ALWAYS_EMIT ||                                                       \
+          (Extracted !=                                                        \
+           static_cast<decltype(KEYPATH)>((IMPLIED_CHECK) ? (IMPLIED_VALUE)    \
+                                                          : (DEFAULT_VALUE)))) \
+        DENORMALIZER(ARGS, SPELLING, STRING_ALLOCATOR, Option::KIND##Class,    \
+                     TABLE_INDEX, Extracted);                                  \
+    }(EXTRACTOR(KEYPATH));                                                     \
+  }
+
+static StringRef GetInputKindName(InputKind IK);
+
+static bool FixupInvocation(CompilerInvocation &Invocation,
+                            DiagnosticsEngine &Diags, const ArgList &Args,
+                            InputKind IK) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  LangOptions &LangOpts = *Invocation.getLangOpts();
+  CodeGenOptions &CodeGenOpts = Invocation.getCodeGenOpts();
+  TargetOptions &TargetOpts = Invocation.getTargetOpts();
+  FrontendOptions &FrontendOpts = Invocation.getFrontendOpts();
+  CodeGenOpts.XRayInstrumentFunctions = LangOpts.XRayInstrument;
+  CodeGenOpts.XRayAlwaysEmitCustomEvents = LangOpts.XRayAlwaysEmitCustomEvents;
+  CodeGenOpts.XRayAlwaysEmitTypedEvents = LangOpts.XRayAlwaysEmitTypedEvents;
+  CodeGenOpts.DisableFree = FrontendOpts.DisableFree;
+  FrontendOpts.GenerateGlobalModuleIndex = FrontendOpts.UseGlobalModuleIndex;
+  if (FrontendOpts.ShowStats)
+    CodeGenOpts.ClearASTBeforeBackend = false;
+  LangOpts.SanitizeCoverage = CodeGenOpts.hasSanitizeCoverage();
+  LangOpts.ForceEmitVTables = CodeGenOpts.ForceEmitVTables;
+  LangOpts.SpeculativeLoadHardening = CodeGenOpts.SpeculativeLoadHardening;
+  LangOpts.CurrentModule = LangOpts.ModuleName;
+
+  llvm::Triple T(TargetOpts.Triple);
+  llvm::Triple::ArchType Arch = T.getArch();
+
+  CodeGenOpts.CodeModel = TargetOpts.CodeModel;
+
+  if (LangOpts.getExceptionHandling() !=
+          LangOptions::ExceptionHandlingKind::None &&
+      T.isWindowsMSVCEnvironment())
+    Diags.Report(diag::err_fe_invalid_exception_model)
+        << static_cast<unsigned>(LangOpts.getExceptionHandling()) << T.str();
+
+  if (LangOpts.AppleKext && !LangOpts.CPlusPlus)
+    Diags.Report(diag::warn_c_kext);
+
+  if (Args.hasArg(OPT_fconcepts_ts))
+    Diags.Report(diag::warn_fe_concepts_ts_flag);
+
+  if (LangOpts.NewAlignOverride &&
+      !llvm::isPowerOf2_32(LangOpts.NewAlignOverride)) {
+    Arg *A = Args.getLastArg(OPT_fnew_alignment_EQ);
+    Diags.Report(diag::err_fe_invalid_alignment)
+        << A->getAsString(Args) << A->getValue();
+    LangOpts.NewAlignOverride = 0;
+  }
+
+  // Prevent the user from specifying both -fsycl-is-device and -fsycl-is-host.
+  if (LangOpts.SYCLIsDevice && LangOpts.SYCLIsHost)
+    Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fsycl-is-device"
+                                                          << "-fsycl-is-host";
+
+  if (Args.hasArg(OPT_fgnu89_inline) && LangOpts.CPlusPlus)
+    Diags.Report(diag::err_drv_argument_not_allowed_with)
+        << "-fgnu89-inline" << GetInputKindName(IK);
+
+  if (Args.hasArg(OPT_fgpu_allow_device_init) && !LangOpts.HIP)
+    Diags.Report(diag::warn_ignored_hip_only_option)
+        << Args.getLastArg(OPT_fgpu_allow_device_init)->getAsString(Args);
+
+  if (Args.hasArg(OPT_gpu_max_threads_per_block_EQ) && !LangOpts.HIP)
+    Diags.Report(diag::warn_ignored_hip_only_option)
+        << Args.getLastArg(OPT_gpu_max_threads_per_block_EQ)->getAsString(Args);
+
+  // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
+  // This option should be deprecated for CL > 1.0 because
+  // this option was added for compatibility with OpenCL 1.0.
+  if (Args.getLastArg(OPT_cl_strict_aliasing) &&
+      (LangOpts.getOpenCLCompatibleVersion() > 100))
+    Diags.Report(diag::warn_option_invalid_ocl_version)
+        << LangOpts.getOpenCLVersionString()
+        << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
+
+  if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
+    auto DefaultCC = LangOpts.getDefaultCallingConv();
+
+    bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
+                      DefaultCC == LangOptions::DCC_StdCall) &&
+                     Arch != llvm::Triple::x86;
+    emitError |= (DefaultCC == LangOptions::DCC_VectorCall ||
+                  DefaultCC == LangOptions::DCC_RegCall) &&
+                 !T.isX86();
+    if (emitError)
+      Diags.Report(diag::err_drv_argument_not_allowed_with)
+          << A->getSpelling() << T.getTriple();
+  }
+
+  if (!CodeGenOpts.ProfileRemappingFile.empty() && CodeGenOpts.LegacyPassManager)
+    Diags.Report(diag::err_drv_argument_only_allowed_with)
+        << Args.getLastArg(OPT_fprofile_remapping_file_EQ)->getAsString(Args)
+        << "-fno-legacy-pass-manager";
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+//===----------------------------------------------------------------------===//
+// Deserialization (from args)
+//===----------------------------------------------------------------------===//
+
+static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
+                                     DiagnosticsEngine &Diags) {
+  unsigned DefaultOpt = llvm::CodeGenOpt::None;
+  if ((IK.getLanguage() == Language::OpenCL ||
+       IK.getLanguage() == Language::OpenCLCXX) &&
+      !Args.hasArg(OPT_cl_opt_disable))
+    DefaultOpt = llvm::CodeGenOpt::Default;
+
+  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+    if (A->getOption().matches(options::OPT_O0))
+      return llvm::CodeGenOpt::None;
+
+    if (A->getOption().matches(options::OPT_Ofast))
+      return llvm::CodeGenOpt::Aggressive;
+
+    assert(A->getOption().matches(options::OPT_O));
+
+    StringRef S(A->getValue());
+    if (S == "s" || S == "z")
+      return llvm::CodeGenOpt::Default;
+
+    if (S == "g")
+      return llvm::CodeGenOpt::Less;
+
+    return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
+  }
+
+  return DefaultOpt;
+}
+
+static unsigned getOptimizationLevelSize(ArgList &Args) {
+  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+    if (A->getOption().matches(options::OPT_O)) {
+      switch (A->getValue()[0]) {
+      default:
+        return 0;
+      case 's':
+        return 1;
+      case 'z':
+        return 2;
+      }
+    }
+  }
+  return 0;
+}
+
+static void GenerateArg(SmallVectorImpl<const char *> &Args,
+                        llvm::opt::OptSpecifier OptSpecifier,
+                        CompilerInvocation::StringAllocator SA) {
+  Option Opt = getDriverOptTable().getOption(OptSpecifier);
+  denormalizeSimpleFlag(Args, SA(Opt.getPrefix() + Opt.getName()), SA,
+                        Option::OptionClass::FlagClass, 0);
+}
+
+static void GenerateArg(SmallVectorImpl<const char *> &Args,
+                        llvm::opt::OptSpecifier OptSpecifier,
+                        const Twine &Value,
+                        CompilerInvocation::StringAllocator SA) {
+  Option Opt = getDriverOptTable().getOption(OptSpecifier);
+  denormalizeString(Args, SA(Opt.getPrefix() + Opt.getName()), SA,
+                    Opt.getKind(), 0, Value);
+}
+
+// Parse command line arguments into CompilerInvocation.
+using ParseFn =
+    llvm::function_ref<bool(CompilerInvocation &, ArrayRef<const char *>,
+                            DiagnosticsEngine &, const char *)>;
+
+// Generate command line arguments from CompilerInvocation.
+using GenerateFn = llvm::function_ref<void(
+    CompilerInvocation &, SmallVectorImpl<const char *> &,
+    CompilerInvocation::StringAllocator)>;
+
+// May perform round-trip of command line arguments. By default, the round-trip
+// is enabled in assert builds. This can be overwritten at run-time via the
+// "-round-trip-args" and "-no-round-trip-args" command line flags.
+// During round-trip, the command line arguments are parsed into a dummy
+// instance of CompilerInvocation which is used to generate the command line
+// arguments again. The real CompilerInvocation instance is then created by
+// parsing the generated arguments, not the original ones.
+static bool RoundTrip(ParseFn Parse, GenerateFn Generate,
+                      CompilerInvocation &RealInvocation,
+                      CompilerInvocation &DummyInvocation,
+                      ArrayRef<const char *> CommandLineArgs,
+                      DiagnosticsEngine &Diags, const char *Argv0) {
+#ifndef NDEBUG
+  bool DoRoundTripDefault = true;
+#else
+  bool DoRoundTripDefault = false;
+#endif
+
+  bool DoRoundTrip = DoRoundTripDefault;
+  for (const auto *Arg : CommandLineArgs) {
+    if (Arg == StringRef("-round-trip-args"))
+      DoRoundTrip = true;
+    if (Arg == StringRef("-no-round-trip-args"))
+      DoRoundTrip = false;
+  }
+
+  // If round-trip was not requested, simply run the parser with the real
+  // invocation diagnostics.
+  if (!DoRoundTrip)
+    return Parse(RealInvocation, CommandLineArgs, Diags, Argv0);
+
+  // Serializes quoted (and potentially escaped) arguments.
+  auto SerializeArgs = [](ArrayRef<const char *> Args) {
+    std::string Buffer;
+    llvm::raw_string_ostream OS(Buffer);
+    for (const char *Arg : Args) {
+      llvm::sys::printArg(OS, Arg, /*Quote=*/true);
+      OS << ' ';
+    }
+    OS.flush();
+    return Buffer;
+  };
+
+  // Setup a dummy DiagnosticsEngine.
+  DiagnosticsEngine DummyDiags(new DiagnosticIDs(), new DiagnosticOptions());
+  DummyDiags.setClient(new TextDiagnosticBuffer());
+
+  // Run the first parse on the original arguments with the dummy invocation and
+  // diagnostics.
+  if (!Parse(DummyInvocation, CommandLineArgs, DummyDiags, Argv0) ||
+      DummyDiags.getNumWarnings() != 0) {
+    // If the first parse did not succeed, it must be user mistake (invalid
+    // command line arguments). We won't be able to generate arguments that
+    // would reproduce the same result. Let's fail again with the real
+    // invocation and diagnostics, so all side-effects of parsing are visible.
+    unsigned NumWarningsBefore = Diags.getNumWarnings();
+    auto Success = Parse(RealInvocation, CommandLineArgs, Diags, Argv0);
+    if (!Success || Diags.getNumWarnings() != NumWarningsBefore)
+      return Success;
+
+    // Parse with original options and diagnostics succeeded even though it
+    // shouldn't have. Something is off.
+    Diags.Report(diag::err_cc1_round_trip_fail_then_ok);
+    Diags.Report(diag::note_cc1_round_trip_original)
+        << SerializeArgs(CommandLineArgs);
+    return false;
+  }
+
+  // Setup string allocator.
+  llvm::BumpPtrAllocator Alloc;
+  llvm::StringSaver StringPool(Alloc);
+  auto SA = [&StringPool](const Twine &Arg) {
+    return StringPool.save(Arg).data();
+  };
+
+  // Generate arguments from the dummy invocation. If Generate is the
+  // inverse of Parse, the newly generated arguments must have the same
+  // semantics as the original.
+  SmallVector<const char *> GeneratedArgs1;
+  Generate(DummyInvocation, GeneratedArgs1, SA);
+
+  // Run the second parse, now on the generated arguments, and with the real
+  // invocation and diagnostics. The result is what we will end up using for the
+  // rest of compilation, so if Generate is not inverse of Parse, something down
+  // the line will break.
+  bool Success2 = Parse(RealInvocation, GeneratedArgs1, Diags, Argv0);
+
+  // The first parse on original arguments succeeded, but second parse of
+  // generated arguments failed. Something must be wrong with the generator.
+  if (!Success2) {
+    Diags.Report(diag::err_cc1_round_trip_ok_then_fail);
+    Diags.Report(diag::note_cc1_round_trip_generated)
+        << 1 << SerializeArgs(GeneratedArgs1);
+    return false;
+  }
+
+  // Generate arguments again, this time from the options we will end up using
+  // for the rest of the compilation.
+  SmallVector<const char *> GeneratedArgs2;
+  Generate(RealInvocation, GeneratedArgs2, SA);
+
+  // Compares two lists of generated arguments.
+  auto Equal = [](const ArrayRef<const char *> A,
+                  const ArrayRef<const char *> B) {
+    return std::equal(A.begin(), A.end(), B.begin(), B.end(),
+                      [](const char *AElem, const char *BElem) {
+                        return StringRef(AElem) == StringRef(BElem);
+                      });
+  };
+
+  // If we generated different arguments from what we assume are two
+  // semantically equivalent CompilerInvocations, the Generate function may
+  // be non-deterministic.
+  if (!Equal(GeneratedArgs1, GeneratedArgs2)) {
+    Diags.Report(diag::err_cc1_round_trip_mismatch);
+    Diags.Report(diag::note_cc1_round_trip_generated)
+        << 1 << SerializeArgs(GeneratedArgs1);
+    Diags.Report(diag::note_cc1_round_trip_generated)
+        << 2 << SerializeArgs(GeneratedArgs2);
+    return false;
+  }
+
+  Diags.Report(diag::remark_cc1_round_trip_generated)
+      << 1 << SerializeArgs(GeneratedArgs1);
+  Diags.Report(diag::remark_cc1_round_trip_generated)
+      << 2 << SerializeArgs(GeneratedArgs2);
+
+  return Success2;
+}
+
+static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
+                              OptSpecifier GroupWithValue,
+                              std::vector<std::string> &Diagnostics) {
+  for (auto *A : Args.filtered(Group)) {
+    if (A->getOption().getKind() == Option::FlagClass) {
+      // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
+      // its name (minus the "W" or "R" at the beginning) to the diagnostics.
+      Diagnostics.push_back(
+          std::string(A->getOption().getName().drop_front(1)));
+    } else if (A->getOption().matches(GroupWithValue)) {
+      // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic
+      // group. Add only the group name to the diagnostics.
+      Diagnostics.push_back(
+          std::string(A->getOption().getName().drop_front(1).rtrim("=-")));
+    } else {
+      // Otherwise, add its value (for OPT_W_Joined and similar).
+      Diagnostics.push_back(A->getValue());
+    }
+  }
+}
+
+// Parse the Static Analyzer configuration. If \p Diags is set to nullptr,
+// it won't verify the input.
+static void parseAnalyzerConfigs(AnalyzerOptions &AnOpts,
+                                 DiagnosticsEngine *Diags);
+
+static void getAllNoBuiltinFuncValues(ArgList &Args,
+                                      std::vector<std::string> &Funcs) {
+  std::vector<std::string> Values = Args.getAllArgValues(OPT_fno_builtin_);
+  auto BuiltinEnd = llvm::partition(Values, Builtin::Context::isBuiltinFunc);
+  Funcs.insert(Funcs.end(), Values.begin(), BuiltinEnd);
+}
+
+static void GenerateAnalyzerArgs(AnalyzerOptions &Opts,
+                                 SmallVectorImpl<const char *> &Args,
+                                 CompilerInvocation::StringAllocator SA) {
+  const AnalyzerOptions *AnalyzerOpts = &Opts;
+
+#define ANALYZER_OPTION_WITH_MARSHALLING(                                      \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef ANALYZER_OPTION_WITH_MARSHALLING
+
+  if (Opts.AnalysisStoreOpt != RegionStoreModel) {
+    switch (Opts.AnalysisStoreOpt) {
+#define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN)                           \
+  case NAME##Model:                                                            \
+    GenerateArg(Args, OPT_analyzer_store, CMDFLAG, SA);                        \
+    break;
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+    default:
+      llvm_unreachable("Tried to generate unknown analysis store.");
+    }
+  }
+
+  if (Opts.AnalysisConstraintsOpt != RangeConstraintsModel) {
+    switch (Opts.AnalysisConstraintsOpt) {
+#define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN)                     \
+  case NAME##Model:                                                            \
+    GenerateArg(Args, OPT_analyzer_constraints, CMDFLAG, SA);                  \
+    break;
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+    default:
+      llvm_unreachable("Tried to generate unknown analysis constraint.");
+    }
+  }
+
+  if (Opts.AnalysisDiagOpt != PD_HTML) {
+    switch (Opts.AnalysisDiagOpt) {
+#define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN)                     \
+  case PD_##NAME:                                                              \
+    GenerateArg(Args, OPT_analyzer_output, CMDFLAG, SA);                       \
+    break;
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+    default:
+      llvm_unreachable("Tried to generate unknown analysis diagnostic client.");
+    }
+  }
+
+  if (Opts.AnalysisPurgeOpt != PurgeStmt) {
+    switch (Opts.AnalysisPurgeOpt) {
+#define ANALYSIS_PURGE(NAME, CMDFLAG, DESC)                                    \
+  case NAME:                                                                   \
+    GenerateArg(Args, OPT_analyzer_purge, CMDFLAG, SA);                        \
+    break;
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+    default:
+      llvm_unreachable("Tried to generate unknown analysis purge mode.");
+    }
+  }
+
+  if (Opts.InliningMode != NoRedundancy) {
+    switch (Opts.InliningMode) {
+#define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC)                            \
+  case NAME:                                                                   \
+    GenerateArg(Args, OPT_analyzer_inlining_mode, CMDFLAG, SA);                \
+    break;
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+    default:
+      llvm_unreachable("Tried to generate unknown analysis inlining mode.");
+    }
+  }
+
+  for (const auto &CP : Opts.CheckersAndPackages) {
+    OptSpecifier Opt =
+        CP.second ? OPT_analyzer_checker : OPT_analyzer_disable_checker;
+    GenerateArg(Args, Opt, CP.first, SA);
+  }
+
+  AnalyzerOptions ConfigOpts;
+  parseAnalyzerConfigs(ConfigOpts, nullptr);
+
+  for (const auto &C : Opts.Config) {
+    // Don't generate anything that came from parseAnalyzerConfigs. It would be
+    // redundant and may not be valid on the command line.
+    auto Entry = ConfigOpts.Config.find(C.getKey());
+    if (Entry != ConfigOpts.Config.end() && Entry->getValue() == C.getValue())
+      continue;
+
+    GenerateArg(Args, OPT_analyzer_config, C.getKey() + "=" + C.getValue(), SA);
+  }
+
+  // Nothing to generate for FullCompilerInvocation.
+}
+
+static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
+                              DiagnosticsEngine &Diags) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  AnalyzerOptions *AnalyzerOpts = &Opts;
+
+#define ANALYZER_OPTION_WITH_MARSHALLING(                                      \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef ANALYZER_OPTION_WITH_MARSHALLING
+
+  if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
+    StringRef Name = A->getValue();
+    AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
+#define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
+      .Case(CMDFLAG, NAME##Model)
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+      .Default(NumStores);
+    if (Value == NumStores) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << Name;
+    } else {
+      Opts.AnalysisStoreOpt = Value;
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
+    StringRef Name = A->getValue();
+    AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
+#define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
+      .Case(CMDFLAG, NAME##Model)
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+      .Default(NumConstraints);
+    if (Value == NumConstraints) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << Name;
+    } else {
+      Opts.AnalysisConstraintsOpt = Value;
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
+    StringRef Name = A->getValue();
+    AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
+#define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
+      .Case(CMDFLAG, PD_##NAME)
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+      .Default(NUM_ANALYSIS_DIAG_CLIENTS);
+    if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << Name;
+    } else {
+      Opts.AnalysisDiagOpt = Value;
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
+    StringRef Name = A->getValue();
+    AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
+#define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
+      .Case(CMDFLAG, NAME)
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+      .Default(NumPurgeModes);
+    if (Value == NumPurgeModes) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << Name;
+    } else {
+      Opts.AnalysisPurgeOpt = Value;
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
+    StringRef Name = A->getValue();
+    AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
+#define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
+      .Case(CMDFLAG, NAME)
+#include "clang/StaticAnalyzer/Core/Analyses.def"
+      .Default(NumInliningModes);
+    if (Value == NumInliningModes) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << Name;
+    } else {
+      Opts.InliningMode = Value;
+    }
+  }
+
+  Opts.CheckersAndPackages.clear();
+  for (const Arg *A :
+       Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
+    A->claim();
+    bool IsEnabled = A->getOption().getID() == OPT_analyzer_checker;
+    // We can have a list of comma separated checker names, e.g:
+    // '-analyzer-checker=cocoa,unix'
+    StringRef CheckerAndPackageList = A->getValue();
+    SmallVector<StringRef, 16> CheckersAndPackages;
+    CheckerAndPackageList.split(CheckersAndPackages, ",");
+    for (const StringRef &CheckerOrPackage : CheckersAndPackages)
+      Opts.CheckersAndPackages.emplace_back(std::string(CheckerOrPackage),
+                                            IsEnabled);
+  }
+
+  // Go through the analyzer configuration options.
+  for (const auto *A : Args.filtered(OPT_analyzer_config)) {
+
+    // We can have a list of comma separated config names, e.g:
+    // '-analyzer-config key1=val1,key2=val2'
+    StringRef configList = A->getValue();
+    SmallVector<StringRef, 4> configVals;
+    configList.split(configVals, ",");
+    for (const auto &configVal : configVals) {
+      StringRef key, val;
+      std::tie(key, val) = configVal.split("=");
+      if (val.empty()) {
+        Diags.Report(SourceLocation(),
+                     diag::err_analyzer_config_no_value) << configVal;
+        break;
+      }
+      if (val.contains('=')) {
+        Diags.Report(SourceLocation(),
+                     diag::err_analyzer_config_multiple_values)
+          << configVal;
+        break;
+      }
+
+      // TODO: Check checker options too, possibly in CheckerRegistry.
+      // Leave unknown non-checker configs unclaimed.
+      if (!key.contains(":") && Opts.isUnknownAnalyzerConfig(key)) {
+        if (Opts.ShouldEmitErrorsOnInvalidConfigValue)
+          Diags.Report(diag::err_analyzer_config_unknown) << key;
+        continue;
+      }
+
+      A->claim();
+      Opts.Config[key] = std::string(val);
+    }
+  }
+
+  if (Opts.ShouldEmitErrorsOnInvalidConfigValue)
+    parseAnalyzerConfigs(Opts, &Diags);
+  else
+    parseAnalyzerConfigs(Opts, nullptr);
+
+  llvm::raw_string_ostream os(Opts.FullCompilerInvocation);
+  for (unsigned i = 0; i < Args.getNumInputArgStrings(); ++i) {
+    if (i != 0)
+      os << " ";
+    os << Args.getArgString(i);
+  }
+  os.flush();
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static StringRef getStringOption(AnalyzerOptions::ConfigTable &Config,
+                                 StringRef OptionName, StringRef DefaultVal) {
+  return Config.insert({OptionName, std::string(DefaultVal)}).first->second;
+}
+
+static void initOption(AnalyzerOptions::ConfigTable &Config,
+                       DiagnosticsEngine *Diags,
+                       StringRef &OptionField, StringRef Name,
+                       StringRef DefaultVal) {
+  // String options may be known to invalid (e.g. if the expected string is a
+  // file name, but the file does not exist), those will have to be checked in
+  // parseConfigs.
+  OptionField = getStringOption(Config, Name, DefaultVal);
+}
+
+static void initOption(AnalyzerOptions::ConfigTable &Config,
+                       DiagnosticsEngine *Diags,
+                       bool &OptionField, StringRef Name, bool DefaultVal) {
+  auto PossiblyInvalidVal = llvm::StringSwitch<Optional<bool>>(
+                 getStringOption(Config, Name, (DefaultVal ? "true" : "false")))
+      .Case("true", true)
+      .Case("false", false)
+      .Default(None);
+
+  if (!PossiblyInvalidVal) {
+    if (Diags)
+      Diags->Report(diag::err_analyzer_config_invalid_input)
+        << Name << "a boolean";
+    else
+      OptionField = DefaultVal;
+  } else
+    OptionField = PossiblyInvalidVal.getValue();
+}
+
+static void initOption(AnalyzerOptions::ConfigTable &Config,
+                       DiagnosticsEngine *Diags,
+                       unsigned &OptionField, StringRef Name,
+                       unsigned DefaultVal) {
+
+  OptionField = DefaultVal;
+  bool HasFailed = getStringOption(Config, Name, std::to_string(DefaultVal))
+                     .getAsInteger(0, OptionField);
+  if (Diags && HasFailed)
+    Diags->Report(diag::err_analyzer_config_invalid_input)
+      << Name << "an unsigned";
+}
+
+static void parseAnalyzerConfigs(AnalyzerOptions &AnOpts,
+                                 DiagnosticsEngine *Diags) {
+  // TODO: There's no need to store the entire configtable, it'd be plenty
+  // enough tostore checker options.
+
+#define ANALYZER_OPTION(TYPE, NAME, CMDFLAG, DESC, DEFAULT_VAL)                \
+  initOption(AnOpts.Config, Diags, AnOpts.NAME, CMDFLAG, DEFAULT_VAL);
+
+#define ANALYZER_OPTION_DEPENDS_ON_USER_MODE(TYPE, NAME, CMDFLAG, DESC,        \
+                                           SHALLOW_VAL, DEEP_VAL)              \
+  switch (AnOpts.getUserMode()) {                                              \
+  case UMK_Shallow:                                                            \
+    initOption(AnOpts.Config, Diags, AnOpts.NAME, CMDFLAG, SHALLOW_VAL);       \
+    break;                                                                     \
+  case UMK_Deep:                                                               \
+    initOption(AnOpts.Config, Diags, AnOpts.NAME, CMDFLAG, DEEP_VAL);          \
+    break;                                                                     \
+  }                                                                            \
+
+#include "clang/StaticAnalyzer/Core/AnalyzerOptions.def"
+#undef ANALYZER_OPTION
+#undef ANALYZER_OPTION_DEPENDS_ON_USER_MODE
+
+  // At this point, AnalyzerOptions is configured. Let's validate some options.
+
+  // FIXME: Here we try to validate the silenced checkers or packages are valid.
+  // The current approach only validates the registered checkers which does not
+  // contain the runtime enabled checkers and optimally we would validate both.
+  if (!AnOpts.RawSilencedCheckersAndPackages.empty()) {
+    std::vector<StringRef> Checkers =
+        AnOpts.getRegisteredCheckers(/*IncludeExperimental=*/true);
+    std::vector<StringRef> Packages =
+        AnOpts.getRegisteredPackages(/*IncludeExperimental=*/true);
+
+    SmallVector<StringRef, 16> CheckersAndPackages;
+    AnOpts.RawSilencedCheckersAndPackages.split(CheckersAndPackages, ";");
+
+    for (const StringRef &CheckerOrPackage : CheckersAndPackages) {
+      if (Diags) {
+        bool IsChecker = CheckerOrPackage.contains('.');
+        bool IsValidName = IsChecker
+                               ? llvm::is_contained(Checkers, CheckerOrPackage)
+                               : llvm::is_contained(Packages, CheckerOrPackage);
+
+        if (!IsValidName)
+          Diags->Report(diag::err_unknown_analyzer_checker_or_package)
+              << CheckerOrPackage;
+      }
+
+      AnOpts.SilencedCheckersAndPackages.emplace_back(CheckerOrPackage);
+    }
+  }
+
+  if (!Diags)
+    return;
+
+  if (AnOpts.ShouldTrackConditionsDebug && !AnOpts.ShouldTrackConditions)
+    Diags->Report(diag::err_analyzer_config_invalid_input)
+        << "track-conditions-debug" << "'track-conditions' to also be enabled";
+
+  if (!AnOpts.CTUDir.empty() && !llvm::sys::fs::is_directory(AnOpts.CTUDir))
+    Diags->Report(diag::err_analyzer_config_invalid_input) << "ctu-dir"
+                                                           << "a filename";
+
+  if (!AnOpts.ModelPath.empty() &&
+      !llvm::sys::fs::is_directory(AnOpts.ModelPath))
+    Diags->Report(diag::err_analyzer_config_invalid_input) << "model-path"
+                                                           << "a filename";
+}
+
+/// Generate a remark argument. This is an inverse of `ParseOptimizationRemark`.
+static void
+GenerateOptimizationRemark(SmallVectorImpl<const char *> &Args,
+                           CompilerInvocation::StringAllocator SA,
+                           OptSpecifier OptEQ, StringRef Name,
+                           const CodeGenOptions::OptRemark &Remark) {
+  if (Remark.hasValidPattern()) {
+    GenerateArg(Args, OptEQ, Remark.Pattern, SA);
+  } else if (Remark.Kind == CodeGenOptions::RK_Enabled) {
+    GenerateArg(Args, OPT_R_Joined, Name, SA);
+  } else if (Remark.Kind == CodeGenOptions::RK_Disabled) {
+    GenerateArg(Args, OPT_R_Joined, StringRef("no-") + Name, SA);
+  }
+}
+
+/// Parse a remark command line argument. It may be missing, disabled/enabled by
+/// '-R[no-]group' or specified with a regular expression by '-Rgroup=regexp'.
+/// On top of that, it can be disabled/enabled globally by '-R[no-]everything'.
+static CodeGenOptions::OptRemark
+ParseOptimizationRemark(DiagnosticsEngine &Diags, ArgList &Args,
+                        OptSpecifier OptEQ, StringRef Name) {
+  CodeGenOptions::OptRemark Result;
+
+  auto InitializeResultPattern = [&Diags, &Args, &Result](const Arg *A,
+                                                          StringRef Pattern) {
+    Result.Pattern = Pattern.str();
+
+    std::string RegexError;
+    Result.Regex = std::make_shared<llvm::Regex>(Result.Pattern);
+    if (!Result.Regex->isValid(RegexError)) {
+      Diags.Report(diag::err_drv_optimization_remark_pattern)
+          << RegexError << A->getAsString(Args);
+      return false;
+    }
+
+    return true;
+  };
+
+  for (Arg *A : Args) {
+    if (A->getOption().matches(OPT_R_Joined)) {
+      StringRef Value = A->getValue();
+
+      if (Value == Name)
+        Result.Kind = CodeGenOptions::RK_Enabled;
+      else if (Value == "everything")
+        Result.Kind = CodeGenOptions::RK_EnabledEverything;
+      else if (Value.split('-') == std::make_pair(StringRef("no"), Name))
+        Result.Kind = CodeGenOptions::RK_Disabled;
+      else if (Value == "no-everything")
+        Result.Kind = CodeGenOptions::RK_DisabledEverything;
+      else
+        continue;
+
+      if (Result.Kind == CodeGenOptions::RK_Disabled ||
+          Result.Kind == CodeGenOptions::RK_DisabledEverything) {
+        Result.Pattern = "";
+        Result.Regex = nullptr;
+      } else {
+        InitializeResultPattern(A, ".*");
+      }
+    } else if (A->getOption().matches(OptEQ)) {
+      Result.Kind = CodeGenOptions::RK_WithPattern;
+      if (!InitializeResultPattern(A, A->getValue()))
+        return CodeGenOptions::OptRemark();
+    }
+  }
+
+  return Result;
+}
+
+static bool parseDiagnosticLevelMask(StringRef FlagName,
+                                     const std::vector<std::string> &Levels,
+                                     DiagnosticsEngine &Diags,
+                                     DiagnosticLevelMask &M) {
+  bool Success = true;
+  for (const auto &Level : Levels) {
+    DiagnosticLevelMask const PM =
+      llvm::StringSwitch<DiagnosticLevelMask>(Level)
+        .Case("note",    DiagnosticLevelMask::Note)
+        .Case("remark",  DiagnosticLevelMask::Remark)
+        .Case("warning", DiagnosticLevelMask::Warning)
+        .Case("error",   DiagnosticLevelMask::Error)
+        .Default(DiagnosticLevelMask::None);
+    if (PM == DiagnosticLevelMask::None) {
+      Success = false;
+      Diags.Report(diag::err_drv_invalid_value) << FlagName << Level;
+    }
+    M = M | PM;
+  }
+  return Success;
+}
+
+static void parseSanitizerKinds(StringRef FlagName,
+                                const std::vector<std::string> &Sanitizers,
+                                DiagnosticsEngine &Diags, SanitizerSet &S) {
+  for (const auto &Sanitizer : Sanitizers) {
+    SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
+    if (K == SanitizerMask())
+      Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
+    else
+      S.set(K, true);
+  }
+}
+
+static SmallVector<StringRef, 4> serializeSanitizerKinds(SanitizerSet S) {
+  SmallVector<StringRef, 4> Values;
+  serializeSanitizerSet(S, Values);
+  return Values;
+}
+
+static void parseXRayInstrumentationBundle(StringRef FlagName, StringRef Bundle,
+                                           ArgList &Args, DiagnosticsEngine &D,
+                                           XRayInstrSet &S) {
+  llvm::SmallVector<StringRef, 2> BundleParts;
+  llvm::SplitString(Bundle, BundleParts, ",");
+  for (const auto &B : BundleParts) {
+    auto Mask = parseXRayInstrValue(B);
+    if (Mask == XRayInstrKind::None)
+      if (B != "none")
+        D.Report(diag::err_drv_invalid_value) << FlagName << Bundle;
+      else
+        S.Mask = Mask;
+    else if (Mask == XRayInstrKind::All)
+      S.Mask = Mask;
+    else
+      S.set(Mask, true);
+  }
+}
+
+static std::string serializeXRayInstrumentationBundle(const XRayInstrSet &S) {
+  llvm::SmallVector<StringRef, 2> BundleParts;
+  serializeXRayInstrValue(S, BundleParts);
+  std::string Buffer;
+  llvm::raw_string_ostream OS(Buffer);
+  llvm::interleave(BundleParts, OS, [&OS](StringRef Part) { OS << Part; }, ",");
+  return Buffer;
+}
+
+// Set the profile kind using fprofile-instrument-use-path.
+static void setPGOUseInstrumentor(CodeGenOptions &Opts,
+                                  const Twine &ProfileName) {
+  auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
+  // In error, return silently and let Clang PGOUse report the error message.
+  if (auto E = ReaderOrErr.takeError()) {
+    llvm::consumeError(std::move(E));
+    Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
+    return;
+  }
+  std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
+    std::move(ReaderOrErr.get());
+  if (PGOReader->isIRLevelProfile()) {
+    if (PGOReader->hasCSIRLevelProfile())
+      Opts.setProfileUse(CodeGenOptions::ProfileCSIRInstr);
+    else
+      Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
+  } else
+    Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
+}
+
+void CompilerInvocation::GenerateCodeGenArgs(
+    const CodeGenOptions &Opts, SmallVectorImpl<const char *> &Args,
+    StringAllocator SA, const llvm::Triple &T, const std::string &OutputFile,
+    const LangOptions *LangOpts) {
+  const CodeGenOptions &CodeGenOpts = Opts;
+
+  if (Opts.OptimizationLevel == 0)
+    GenerateArg(Args, OPT_O0, SA);
+  else
+    GenerateArg(Args, OPT_O, Twine(Opts.OptimizationLevel), SA);
+
+#define CODEGEN_OPTION_WITH_MARSHALLING(                                       \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef CODEGEN_OPTION_WITH_MARSHALLING
+
+  if (Opts.OptimizationLevel > 0) {
+    if (Opts.Inlining == CodeGenOptions::NormalInlining)
+      GenerateArg(Args, OPT_finline_functions, SA);
+    else if (Opts.Inlining == CodeGenOptions::OnlyHintInlining)
+      GenerateArg(Args, OPT_finline_hint_functions, SA);
+    else if (Opts.Inlining == CodeGenOptions::OnlyAlwaysInlining)
+      GenerateArg(Args, OPT_fno_inline, SA);
+  }
+
+  if (Opts.DirectAccessExternalData && LangOpts->PICLevel != 0)
+    GenerateArg(Args, OPT_fdirect_access_external_data, SA);
+  else if (!Opts.DirectAccessExternalData && LangOpts->PICLevel == 0)
+    GenerateArg(Args, OPT_fno_direct_access_external_data, SA);
+
+  Optional<StringRef> DebugInfoVal;
+  switch (Opts.DebugInfo) {
+  case codegenoptions::DebugLineTablesOnly:
+    DebugInfoVal = "line-tables-only";
+    break;
+  case codegenoptions::DebugDirectivesOnly:
+    DebugInfoVal = "line-directives-only";
+    break;
+  case codegenoptions::DebugInfoConstructor:
+    DebugInfoVal = "constructor";
+    break;
+  case codegenoptions::LimitedDebugInfo:
+    DebugInfoVal = "limited";
+    break;
+  case codegenoptions::FullDebugInfo:
+    DebugInfoVal = "standalone";
+    break;
+  case codegenoptions::UnusedTypeInfo:
+    DebugInfoVal = "unused-types";
+    break;
+  case codegenoptions::NoDebugInfo: // default value
+    DebugInfoVal = None;
+    break;
+  case codegenoptions::LocTrackingOnly: // implied value
+    DebugInfoVal = None;
+    break;
+  }
+  if (DebugInfoVal)
+    GenerateArg(Args, OPT_debug_info_kind_EQ, *DebugInfoVal, SA);
+
+  for (const auto &Prefix : Opts.DebugPrefixMap)
+    GenerateArg(Args, OPT_fdebug_prefix_map_EQ,
+                Prefix.first + "=" + Prefix.second, SA);
+
+  for (const auto &Prefix : Opts.CoveragePrefixMap)
+    GenerateArg(Args, OPT_fcoverage_prefix_map_EQ,
+                Prefix.first + "=" + Prefix.second, SA);
+
+  if (Opts.NewStructPathTBAA)
+    GenerateArg(Args, OPT_new_struct_path_tbaa, SA);
+
+  if (Opts.OptimizeSize == 1)
+    GenerateArg(Args, OPT_O, "s", SA);
+  else if (Opts.OptimizeSize == 2)
+    GenerateArg(Args, OPT_O, "z", SA);
+
+  // SimplifyLibCalls is set only in the absence of -fno-builtin and
+  // -ffreestanding. We'll consider that when generating them.
+
+  // NoBuiltinFuncs are generated by LangOptions.
+
+  if (Opts.UnrollLoops && Opts.OptimizationLevel <= 1)
+    GenerateArg(Args, OPT_funroll_loops, SA);
+  else if (!Opts.UnrollLoops && Opts.OptimizationLevel > 1)
+    GenerateArg(Args, OPT_fno_unroll_loops, SA);
+
+  if (!Opts.BinutilsVersion.empty())
+    GenerateArg(Args, OPT_fbinutils_version_EQ, Opts.BinutilsVersion, SA);
+
+  if (Opts.DebugNameTable ==
+      static_cast<unsigned>(llvm::DICompileUnit::DebugNameTableKind::GNU))
+    GenerateArg(Args, OPT_ggnu_pubnames, SA);
+  else if (Opts.DebugNameTable ==
+           static_cast<unsigned>(
+               llvm::DICompileUnit::DebugNameTableKind::Default))
+    GenerateArg(Args, OPT_gpubnames, SA);
+
+  auto TNK = Opts.getDebugSimpleTemplateNames();
+  if (TNK != codegenoptions::DebugTemplateNamesKind::Full) {
+    if (TNK == codegenoptions::DebugTemplateNamesKind::Simple)
+      GenerateArg(Args, OPT_gsimple_template_names_EQ, "simple", SA);
+    else if (TNK == codegenoptions::DebugTemplateNamesKind::Mangled)
+      GenerateArg(Args, OPT_gsimple_template_names_EQ, "mangled", SA);
+  }
+  // ProfileInstrumentUsePath is marshalled automatically, no need to generate
+  // it or PGOUseInstrumentor.
+
+  if (Opts.TimePasses) {
+    if (Opts.TimePassesPerRun)
+      GenerateArg(Args, OPT_ftime_report_EQ, "per-pass-run", SA);
+    else
+      GenerateArg(Args, OPT_ftime_report, SA);
+  }
+
+  if (Opts.PrepareForLTO && !Opts.PrepareForThinLTO)
+    GenerateArg(Args, OPT_flto_EQ, "full", SA);
+
+  if (Opts.PrepareForThinLTO)
+    GenerateArg(Args, OPT_flto_EQ, "thin", SA);
+
+  if (!Opts.ThinLTOIndexFile.empty())
+    GenerateArg(Args, OPT_fthinlto_index_EQ, Opts.ThinLTOIndexFile, SA);
+
+  if (Opts.SaveTempsFilePrefix == OutputFile)
+    GenerateArg(Args, OPT_save_temps_EQ, "obj", SA);
+
+  StringRef MemProfileBasename("memprof.profraw");
+  if (!Opts.MemoryProfileOutput.empty()) {
+    if (Opts.MemoryProfileOutput == MemProfileBasename) {
+      GenerateArg(Args, OPT_fmemory_profile, SA);
+    } else {
+      size_t ArgLength =
+          Opts.MemoryProfileOutput.size() - MemProfileBasename.size();
+      GenerateArg(Args, OPT_fmemory_profile_EQ,
+                  Opts.MemoryProfileOutput.substr(0, ArgLength), SA);
+    }
+  }
+
+  if (memcmp(Opts.CoverageVersion, "408*", 4) != 0)
+    GenerateArg(Args, OPT_coverage_version_EQ,
+                StringRef(Opts.CoverageVersion, 4), SA);
+
+  // TODO: Check if we need to generate arguments stored in CmdArgs. (Namely
+  //  '-fembed_bitcode', which does not map to any CompilerInvocation field and
+  //  won't be generated.)
+
+  if (Opts.XRayInstrumentationBundle.Mask != XRayInstrKind::All) {
+    std::string InstrBundle =
+        serializeXRayInstrumentationBundle(Opts.XRayInstrumentationBundle);
+    if (!InstrBundle.empty())
+      GenerateArg(Args, OPT_fxray_instrumentation_bundle, InstrBundle, SA);
+  }
+
+  if (Opts.CFProtectionReturn && Opts.CFProtectionBranch)
+    GenerateArg(Args, OPT_fcf_protection_EQ, "full", SA);
+  else if (Opts.CFProtectionReturn)
+    GenerateArg(Args, OPT_fcf_protection_EQ, "return", SA);
+  else if (Opts.CFProtectionBranch)
+    GenerateArg(Args, OPT_fcf_protection_EQ, "branch", SA);
+
+  for (const auto &F : Opts.LinkBitcodeFiles) {
+    bool Builtint = F.LinkFlags == llvm::Linker::Flags::LinkOnlyNeeded &&
+                    F.PropagateAttrs && F.Internalize;
+    GenerateArg(Args,
+                Builtint ? OPT_mlink_builtin_bitcode : OPT_mlink_bitcode_file,
+                F.Filename, SA);
+  }
+
+  // TODO: Consider removing marshalling annotations from f[no_]emulated_tls.
+  //  That would make it easy to generate the option only **once** if it was
+  //  explicitly set to non-default value.
+  if (Opts.ExplicitEmulatedTLS) {
+    GenerateArg(
+        Args, Opts.EmulatedTLS ? OPT_femulated_tls : OPT_fno_emulated_tls, SA);
+  }
+
+  if (Opts.FPDenormalMode != llvm::DenormalMode::getIEEE())
+    GenerateArg(Args, OPT_fdenormal_fp_math_EQ, Opts.FPDenormalMode.str(), SA);
+
+  if (Opts.FP32DenormalMode != llvm::DenormalMode::getIEEE())
+    GenerateArg(Args, OPT_fdenormal_fp_math_f32_EQ, Opts.FP32DenormalMode.str(),
+                SA);
+
+  if (Opts.StructReturnConvention == CodeGenOptions::SRCK_OnStack) {
+    OptSpecifier Opt =
+        T.isPPC32() ? OPT_maix_struct_return : OPT_fpcc_struct_return;
+    GenerateArg(Args, Opt, SA);
+  } else if (Opts.StructReturnConvention == CodeGenOptions::SRCK_InRegs) {
+    OptSpecifier Opt =
+        T.isPPC32() ? OPT_msvr4_struct_return : OPT_freg_struct_return;
+    GenerateArg(Args, Opt, SA);
+  }
+
+  if (Opts.EnableAIXExtendedAltivecABI)
+    GenerateArg(Args, OPT_mabi_EQ_vec_extabi, SA);
+
+  if (!Opts.OptRecordPasses.empty())
+    GenerateArg(Args, OPT_opt_record_passes, Opts.OptRecordPasses, SA);
+
+  if (!Opts.OptRecordFormat.empty())
+    GenerateArg(Args, OPT_opt_record_format, Opts.OptRecordFormat, SA);
+
+  GenerateOptimizationRemark(Args, SA, OPT_Rpass_EQ, "pass",
+                             Opts.OptimizationRemark);
+
+  GenerateOptimizationRemark(Args, SA, OPT_Rpass_missed_EQ, "pass-missed",
+                             Opts.OptimizationRemarkMissed);
+
+  GenerateOptimizationRemark(Args, SA, OPT_Rpass_analysis_EQ, "pass-analysis",
+                             Opts.OptimizationRemarkAnalysis);
+
+  GenerateArg(Args, OPT_fdiagnostics_hotness_threshold_EQ,
+              Opts.DiagnosticsHotnessThreshold
+                  ? Twine(*Opts.DiagnosticsHotnessThreshold)
+                  : "auto",
+              SA);
+
+  for (StringRef Sanitizer : serializeSanitizerKinds(Opts.SanitizeRecover))
+    GenerateArg(Args, OPT_fsanitize_recover_EQ, Sanitizer, SA);
+
+  for (StringRef Sanitizer : serializeSanitizerKinds(Opts.SanitizeTrap))
+    GenerateArg(Args, OPT_fsanitize_trap_EQ, Sanitizer, SA);
+
+  if (!Opts.EmitVersionIdentMetadata)
+    GenerateArg(Args, OPT_Qn, SA);
+
+  switch (Opts.FiniteLoops) {
+  case CodeGenOptions::FiniteLoopsKind::Language:
+    break;
+  case CodeGenOptions::FiniteLoopsKind::Always:
+    GenerateArg(Args, OPT_ffinite_loops, SA);
+    break;
+  case CodeGenOptions::FiniteLoopsKind::Never:
+    GenerateArg(Args, OPT_fno_finite_loops, SA);
+    break;
+  }
+}
+
+bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
+                                          InputKind IK,
+                                          DiagnosticsEngine &Diags,
+                                          const llvm::Triple &T,
+                                          const std::string &OutputFile,
+                                          const LangOptions &LangOptsRef) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
+  // TODO: This could be done in Driver
+  unsigned MaxOptLevel = 3;
+  if (OptimizationLevel > MaxOptLevel) {
+    // If the optimization level is not supported, fall back on the default
+    // optimization
+    Diags.Report(diag::warn_drv_optimization_value)
+        << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
+    OptimizationLevel = MaxOptLevel;
+  }
+  Opts.OptimizationLevel = OptimizationLevel;
+
+  // The key paths of codegen options defined in Options.td start with
+  // "CodeGenOpts.". Let's provide the expected variable name and type.
+  CodeGenOptions &CodeGenOpts = Opts;
+  // Some codegen options depend on language options. Let's provide the expected
+  // variable name and type.
+  const LangOptions *LangOpts = &LangOptsRef;
+
+#define CODEGEN_OPTION_WITH_MARSHALLING(                                       \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef CODEGEN_OPTION_WITH_MARSHALLING
+
+  // At O0 we want to fully disable inlining outside of cases marked with
+  // 'alwaysinline' that are required for correctness.
+  Opts.setInlining((Opts.OptimizationLevel == 0)
+                       ? CodeGenOptions::OnlyAlwaysInlining
+                       : CodeGenOptions::NormalInlining);
+  // Explicit inlining flags can disable some or all inlining even at
+  // optimization levels above zero.
+  if (Arg *InlineArg = Args.getLastArg(
+          options::OPT_finline_functions, options::OPT_finline_hint_functions,
+          options::OPT_fno_inline_functions, options::OPT_fno_inline)) {
+    if (Opts.OptimizationLevel > 0) {
+      const Option &InlineOpt = InlineArg->getOption();
+      if (InlineOpt.matches(options::OPT_finline_functions))
+        Opts.setInlining(CodeGenOptions::NormalInlining);
+      else if (InlineOpt.matches(options::OPT_finline_hint_functions))
+        Opts.setInlining(CodeGenOptions::OnlyHintInlining);
+      else
+        Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
+    }
+  }
+
+  // PIC defaults to -fno-direct-access-external-data while non-PIC defaults to
+  // -fdirect-access-external-data.
+  Opts.DirectAccessExternalData =
+      Args.hasArg(OPT_fdirect_access_external_data) ||
+      (!Args.hasArg(OPT_fno_direct_access_external_data) &&
+       LangOpts->PICLevel == 0);
+
+  if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
+    unsigned Val =
+        llvm::StringSwitch<unsigned>(A->getValue())
+            .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
+            .Case("line-directives-only", codegenoptions::DebugDirectivesOnly)
+            .Case("constructor", codegenoptions::DebugInfoConstructor)
+            .Case("limited", codegenoptions::LimitedDebugInfo)
+            .Case("standalone", codegenoptions::FullDebugInfo)
+            .Case("unused-types", codegenoptions::UnusedTypeInfo)
+            .Default(~0U);
+    if (Val == ~0U)
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
+                                                << A->getValue();
+    else
+      Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
+  }
+
+  // If -fuse-ctor-homing is set and limited debug info is already on, then use
+  // constructor homing, and vice versa for -fno-use-ctor-homing.
+  if (const Arg *A =
+          Args.getLastArg(OPT_fuse_ctor_homing, OPT_fno_use_ctor_homing)) {
+    if (A->getOption().matches(OPT_fuse_ctor_homing) &&
+        Opts.getDebugInfo() == codegenoptions::LimitedDebugInfo)
+      Opts.setDebugInfo(codegenoptions::DebugInfoConstructor);
+    if (A->getOption().matches(OPT_fno_use_ctor_homing) &&
+        Opts.getDebugInfo() == codegenoptions::DebugInfoConstructor)
+      Opts.setDebugInfo(codegenoptions::LimitedDebugInfo);
+  }
+
+  for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ)) {
+    auto Split = StringRef(Arg).split('=');
+    Opts.DebugPrefixMap.insert(
+        {std::string(Split.first), std::string(Split.second)});
+  }
+
+  for (const auto &Arg : Args.getAllArgValues(OPT_fcoverage_prefix_map_EQ)) {
+    auto Split = StringRef(Arg).split('=');
+    Opts.CoveragePrefixMap.insert(
+        {std::string(Split.first), std::string(Split.second)});
+  }
+
+  const llvm::Triple::ArchType DebugEntryValueArchs[] = {
+      llvm::Triple::x86, llvm::Triple::x86_64, llvm::Triple::aarch64,
+      llvm::Triple::arm, llvm::Triple::armeb, llvm::Triple::mips,
+      llvm::Triple::mipsel, llvm::Triple::mips64, llvm::Triple::mips64el};
+
+  if (Opts.OptimizationLevel > 0 && Opts.hasReducedDebugInfo() &&
+      llvm::is_contained(DebugEntryValueArchs, T.getArch()))
+    Opts.EmitCallSiteInfo = true;
+
+  if (!Opts.EnableDIPreservationVerify && Opts.DIBugsReportFilePath.size()) {
+    Diags.Report(diag::warn_ignoring_verify_debuginfo_preserve_export)
+        << Opts.DIBugsReportFilePath;
+    Opts.DIBugsReportFilePath = "";
+  }
+
+  Opts.NewStructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa) &&
+                           Args.hasArg(OPT_new_struct_path_tbaa);
+  Opts.OptimizeSize = getOptimizationLevelSize(Args);
+  Opts.SimplifyLibCalls = !LangOpts->NoBuiltin;
+  if (Opts.SimplifyLibCalls)
+    Opts.NoBuiltinFuncs = LangOpts->NoBuiltinFuncs;
+  Opts.UnrollLoops =
+      Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
+                   (Opts.OptimizationLevel > 1));
+  Opts.BinutilsVersion =
+      std::string(Args.getLastArgValue(OPT_fbinutils_version_EQ));
+
+  Opts.DebugNameTable = static_cast<unsigned>(
+      Args.hasArg(OPT_ggnu_pubnames)
+          ? llvm::DICompileUnit::DebugNameTableKind::GNU
+          : Args.hasArg(OPT_gpubnames)
+                ? llvm::DICompileUnit::DebugNameTableKind::Default
+                : llvm::DICompileUnit::DebugNameTableKind::None);
+  if (const Arg *A = Args.getLastArg(OPT_gsimple_template_names_EQ)) {
+    StringRef Value = A->getValue();
+    if (Value != "simple" && Value != "mangled")
+      Diags.Report(diag::err_drv_unsupported_option_argument)
+          << A->getOption().getName() << A->getValue();
+    Opts.setDebugSimpleTemplateNames(
+        StringRef(A->getValue()) == "simple"
+            ? codegenoptions::DebugTemplateNamesKind::Simple
+            : codegenoptions::DebugTemplateNamesKind::Mangled);
+  }
+
+  if (!Opts.ProfileInstrumentUsePath.empty())
+    setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
+
+  if (const Arg *A = Args.getLastArg(OPT_ftime_report, OPT_ftime_report_EQ)) {
+    Opts.TimePasses = true;
+
+    // -ftime-report= is only for new pass manager.
+    if (A->getOption().getID() == OPT_ftime_report_EQ) {
+      if (Opts.LegacyPassManager)
+        Diags.Report(diag::err_drv_argument_only_allowed_with)
+            << A->getAsString(Args) << "-fno-legacy-pass-manager";
+
+      StringRef Val = A->getValue();
+      if (Val == "per-pass")
+        Opts.TimePassesPerRun = false;
+      else if (Val == "per-pass-run")
+        Opts.TimePassesPerRun = true;
+      else
+        Diags.Report(diag::err_drv_invalid_value)
+            << A->getAsString(Args) << A->getValue();
+    }
+  }
+
+  Opts.PrepareForLTO = false;
+  Opts.PrepareForThinLTO = false;
+  if (Arg *A = Args.getLastArg(OPT_flto_EQ)) {
+    Opts.PrepareForLTO = true;
+    StringRef S = A->getValue();
+    if (S == "thin")
+      Opts.PrepareForThinLTO = true;
+    else if (S != "full")
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
+  }
+  if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
+    if (IK.getLanguage() != Language::LLVM_IR)
+      Diags.Report(diag::err_drv_argument_only_allowed_with)
+          << A->getAsString(Args) << "-x ir";
+    Opts.ThinLTOIndexFile =
+        std::string(Args.getLastArgValue(OPT_fthinlto_index_EQ));
+  }
+  if (Arg *A = Args.getLastArg(OPT_save_temps_EQ))
+    Opts.SaveTempsFilePrefix =
+        llvm::StringSwitch<std::string>(A->getValue())
+            .Case("obj", OutputFile)
+            .Default(llvm::sys::path::filename(OutputFile).str());
+
+  // The memory profile runtime appends the pid to make this name more unique.
+  const char *MemProfileBasename = "memprof.profraw";
+  if (Args.hasArg(OPT_fmemory_profile_EQ)) {
+    SmallString<128> Path(
+        std::string(Args.getLastArgValue(OPT_fmemory_profile_EQ)));
+    llvm::sys::path::append(Path, MemProfileBasename);
+    Opts.MemoryProfileOutput = std::string(Path);
+  } else if (Args.hasArg(OPT_fmemory_profile))
+    Opts.MemoryProfileOutput = MemProfileBasename;
+
+  memcpy(Opts.CoverageVersion, "408*", 4);
+  if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
+    if (Args.hasArg(OPT_coverage_version_EQ)) {
+      StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
+      if (CoverageVersion.size() != 4) {
+        Diags.Report(diag::err_drv_invalid_value)
+            << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
+            << CoverageVersion;
+      } else {
+        memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
+      }
+    }
+  }
+  // FIXME: For backend options that are not yet recorded as function
+  // attributes in the IR, keep track of them so we can embed them in a
+  // separate data section and use them when building the bitcode.
+  for (const auto &A : Args) {
+    // Do not encode output and input.
+    if (A->getOption().getID() == options::OPT_o ||
+        A->getOption().getID() == options::OPT_INPUT ||
+        A->getOption().getID() == options::OPT_x ||
+        A->getOption().getID() == options::OPT_fembed_bitcode ||
+        A->getOption().matches(options::OPT_W_Group))
+      continue;
+    ArgStringList ASL;
+    A->render(Args, ASL);
+    for (const auto &arg : ASL) {
+      StringRef ArgStr(arg);
+      Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
+      // using \00 to separate each commandline options.
+      Opts.CmdArgs.push_back('\0');
+    }
+  }
+
+  auto XRayInstrBundles =
+      Args.getAllArgValues(OPT_fxray_instrumentation_bundle);
+  if (XRayInstrBundles.empty())
+    Opts.XRayInstrumentationBundle.Mask = XRayInstrKind::All;
+  else
+    for (const auto &A : XRayInstrBundles)
+      parseXRayInstrumentationBundle("-fxray-instrumentation-bundle=", A, Args,
+                                     Diags, Opts.XRayInstrumentationBundle);
+
+  if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
+    StringRef Name = A->getValue();
+    if (Name == "full") {
+      Opts.CFProtectionReturn = 1;
+      Opts.CFProtectionBranch = 1;
+    } else if (Name == "return")
+      Opts.CFProtectionReturn = 1;
+    else if (Name == "branch")
+      Opts.CFProtectionBranch = 1;
+    else if (Name != "none")
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
+  }
+
+  if (Opts.PrepareForLTO && Args.hasArg(OPT_mibt_seal))
+    Opts.IBTSeal = 1;
+
+  for (auto *A :
+       Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_builtin_bitcode)) {
+    CodeGenOptions::BitcodeFileToLink F;
+    F.Filename = A->getValue();
+    if (A->getOption().matches(OPT_mlink_builtin_bitcode)) {
+      F.LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded;
+      // When linking CUDA bitcode, propagate function attributes so that
+      // e.g. libdevice gets fast-math attrs if we're building with fast-math.
+      F.PropagateAttrs = true;
+      F.Internalize = true;
+    }
+    Opts.LinkBitcodeFiles.push_back(F);
+  }
+
+  if (Args.getLastArg(OPT_femulated_tls) ||
+      Args.getLastArg(OPT_fno_emulated_tls)) {
+    Opts.ExplicitEmulatedTLS = true;
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
+    if (T.isOSAIX()) {
+      StringRef Name = A->getValue();
+      if (Name != "global-dynamic")
+        Diags.Report(diag::err_aix_unsupported_tls_model) << Name;
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
+    StringRef Val = A->getValue();
+    Opts.FPDenormalMode = llvm::parseDenormalFPAttribute(Val);
+    if (!Opts.FPDenormalMode.isValid())
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_f32_EQ)) {
+    StringRef Val = A->getValue();
+    Opts.FP32DenormalMode = llvm::parseDenormalFPAttribute(Val);
+    if (!Opts.FP32DenormalMode.isValid())
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
+  }
+
+  // X86_32 has -fppc-struct-return and -freg-struct-return.
+  // PPC32 has -maix-struct-return and -msvr4-struct-return.
+  if (Arg *A =
+          Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return,
+                          OPT_maix_struct_return, OPT_msvr4_struct_return)) {
+    // TODO: We might want to consider enabling these options on AIX in the
+    // future.
+    if (T.isOSAIX())
+      Diags.Report(diag::err_drv_unsupported_opt_for_target)
+          << A->getSpelling() << T.str();
+
+    const Option &O = A->getOption();
+    if (O.matches(OPT_fpcc_struct_return) ||
+        O.matches(OPT_maix_struct_return)) {
+      Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
+    } else {
+      assert(O.matches(OPT_freg_struct_return) ||
+             O.matches(OPT_msvr4_struct_return));
+      Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
+    }
+  }
+
+  if (Arg *A =
+          Args.getLastArg(OPT_mabi_EQ_vec_default, OPT_mabi_EQ_vec_extabi)) {
+    if (!T.isOSAIX())
+      Diags.Report(diag::err_drv_unsupported_opt_for_target)
+          << A->getSpelling() << T.str();
+
+    const Option &O = A->getOption();
+    Opts.EnableAIXExtendedAltivecABI = O.matches(OPT_mabi_EQ_vec_extabi);
+  }
+
+  bool NeedLocTracking = false;
+
+  if (!Opts.OptRecordFile.empty())
+    NeedLocTracking = true;
+
+  if (Arg *A = Args.getLastArg(OPT_opt_record_passes)) {
+    Opts.OptRecordPasses = A->getValue();
+    NeedLocTracking = true;
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_opt_record_format)) {
+    Opts.OptRecordFormat = A->getValue();
+    NeedLocTracking = true;
+  }
+
+  Opts.OptimizationRemark =
+      ParseOptimizationRemark(Diags, Args, OPT_Rpass_EQ, "pass");
+
+  Opts.OptimizationRemarkMissed =
+      ParseOptimizationRemark(Diags, Args, OPT_Rpass_missed_EQ, "pass-missed");
+
+  Opts.OptimizationRemarkAnalysis = ParseOptimizationRemark(
+      Diags, Args, OPT_Rpass_analysis_EQ, "pass-analysis");
+
+  NeedLocTracking |= Opts.OptimizationRemark.hasValidPattern() ||
+                     Opts.OptimizationRemarkMissed.hasValidPattern() ||
+                     Opts.OptimizationRemarkAnalysis.hasValidPattern();
+
+  bool UsingSampleProfile = !Opts.SampleProfileFile.empty();
+  bool UsingProfile = UsingSampleProfile ||
+      (Opts.getProfileUse() != CodeGenOptions::ProfileNone);
+
+  if (Opts.DiagnosticsWithHotness && !UsingProfile &&
+      // An IR file will contain PGO as metadata
+      IK.getLanguage() != Language::LLVM_IR)
+    Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
+        << "-fdiagnostics-show-hotness";
+
+  // Parse remarks hotness threshold. Valid value is either integer or 'auto'.
+  if (auto *arg =
+          Args.getLastArg(options::OPT_fdiagnostics_hotness_threshold_EQ)) {
+    auto ResultOrErr =
+        llvm::remarks::parseHotnessThresholdOption(arg->getValue());
+
+    if (!ResultOrErr) {
+      Diags.Report(diag::err_drv_invalid_diagnotics_hotness_threshold)
+          << "-fdiagnostics-hotness-threshold=";
+    } else {
+      Opts.DiagnosticsHotnessThreshold = *ResultOrErr;
+      if ((!Opts.DiagnosticsHotnessThreshold.hasValue() ||
+           Opts.DiagnosticsHotnessThreshold.getValue() > 0) &&
+          !UsingProfile)
+        Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
+            << "-fdiagnostics-hotness-threshold=";
+    }
+  }
+
+  // If the user requested to use a sample profile for PGO, then the
+  // backend will need to track source location information so the profile
+  // can be incorporated into the IR.
+  if (UsingSampleProfile)
+    NeedLocTracking = true;
+
+  if (!Opts.StackUsageOutput.empty())
+    NeedLocTracking = true;
+
+  // If the user requested a flag that requires source locations available in
+  // the backend, make sure that the backend tracks source location information.
+  if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
+    Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
+
+  // Parse -fsanitize-recover= arguments.
+  // FIXME: Report unrecoverable sanitizers incorrectly specified here.
+  parseSanitizerKinds("-fsanitize-recover=",
+                      Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
+                      Opts.SanitizeRecover);
+  parseSanitizerKinds("-fsanitize-trap=",
+                      Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
+                      Opts.SanitizeTrap);
+
+  Opts.EmitVersionIdentMetadata = Args.hasFlag(OPT_Qy, OPT_Qn, true);
+
+  if (Args.hasArg(options::OPT_ffinite_loops))
+    Opts.FiniteLoops = CodeGenOptions::FiniteLoopsKind::Always;
+  else if (Args.hasArg(options::OPT_fno_finite_loops))
+    Opts.FiniteLoops = CodeGenOptions::FiniteLoopsKind::Never;
+
+  Opts.EmitIEEENaNCompliantInsts =
+      Args.hasFlag(options::OPT_mamdgpu_ieee, options::OPT_mno_amdgpu_ieee);
+  if (!Opts.EmitIEEENaNCompliantInsts && !LangOptsRef.NoHonorNaNs)
+    Diags.Report(diag::err_drv_amdgpu_ieee_without_no_honor_nans);
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static void
+GenerateDependencyOutputArgs(const DependencyOutputOptions &Opts,
+                             SmallVectorImpl<const char *> &Args,
+                             CompilerInvocation::StringAllocator SA) {
+  const DependencyOutputOptions &DependencyOutputOpts = Opts;
+#define DEPENDENCY_OUTPUT_OPTION_WITH_MARSHALLING(                             \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef DEPENDENCY_OUTPUT_OPTION_WITH_MARSHALLING
+
+  if (Opts.ShowIncludesDest != ShowIncludesDestination::None)
+    GenerateArg(Args, OPT_show_includes, SA);
+
+  for (const auto &Dep : Opts.ExtraDeps) {
+    switch (Dep.second) {
+    case EDK_SanitizeIgnorelist:
+      // Sanitizer ignorelist arguments are generated from LanguageOptions.
+      continue;
+    case EDK_ModuleFile:
+      // Module file arguments are generated from FrontendOptions and
+      // HeaderSearchOptions.
+      continue;
+    case EDK_ProfileList:
+      // Profile list arguments are generated from LanguageOptions via the
+      // marshalling infrastructure.
+      continue;
+    case EDK_DepFileEntry:
+      GenerateArg(Args, OPT_fdepfile_entry, Dep.first, SA);
+      break;
+    }
+  }
+}
+
+static bool ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
+                                      ArgList &Args, DiagnosticsEngine &Diags,
+                                      frontend::ActionKind Action,
+                                      bool ShowLineMarkers) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  DependencyOutputOptions &DependencyOutputOpts = Opts;
+#define DEPENDENCY_OUTPUT_OPTION_WITH_MARSHALLING(                             \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef DEPENDENCY_OUTPUT_OPTION_WITH_MARSHALLING
+
+  if (Args.hasArg(OPT_show_includes)) {
+    // Writing both /showIncludes and preprocessor output to stdout
+    // would produce interleaved output, so use stderr for /showIncludes.
+    // This behaves the same as cl.exe, when /E, /EP or /P are passed.
+    if (Action == frontend::PrintPreprocessedInput || !ShowLineMarkers)
+      Opts.ShowIncludesDest = ShowIncludesDestination::Stderr;
+    else
+      Opts.ShowIncludesDest = ShowIncludesDestination::Stdout;
+  } else {
+    Opts.ShowIncludesDest = ShowIncludesDestination::None;
+  }
+
+  // Add sanitizer ignorelists as extra dependencies.
+  // They won't be discovered by the regular preprocessor, so
+  // we let make / ninja to know about this implicit dependency.
+  if (!Args.hasArg(OPT_fno_sanitize_ignorelist)) {
+    for (const auto *A : Args.filtered(OPT_fsanitize_ignorelist_EQ)) {
+      StringRef Val = A->getValue();
+      if (!Val.contains('='))
+        Opts.ExtraDeps.emplace_back(std::string(Val), EDK_SanitizeIgnorelist);
+    }
+    if (Opts.IncludeSystemHeaders) {
+      for (const auto *A : Args.filtered(OPT_fsanitize_system_ignorelist_EQ)) {
+        StringRef Val = A->getValue();
+        if (!Val.contains('='))
+          Opts.ExtraDeps.emplace_back(std::string(Val), EDK_SanitizeIgnorelist);
+      }
+    }
+  }
+
+  // -fprofile-list= dependencies.
+  for (const auto &Filename : Args.getAllArgValues(OPT_fprofile_list_EQ))
+    Opts.ExtraDeps.emplace_back(Filename, EDK_ProfileList);
+
+  // Propagate the extra dependencies.
+  for (const auto *A : Args.filtered(OPT_fdepfile_entry))
+    Opts.ExtraDeps.emplace_back(A->getValue(), EDK_DepFileEntry);
+
+  // Only the -fmodule-file=<file> form.
+  for (const auto *A : Args.filtered(OPT_fmodule_file)) {
+    StringRef Val = A->getValue();
+    if (!Val.contains('='))
+      Opts.ExtraDeps.emplace_back(std::string(Val), EDK_ModuleFile);
+  }
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
+  // Color diagnostics default to auto ("on" if terminal supports) in the driver
+  // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
+  // Support both clang's -f[no-]color-diagnostics and gcc's
+  // -f[no-]diagnostics-colors[=never|always|auto].
+  enum {
+    Colors_On,
+    Colors_Off,
+    Colors_Auto
+  } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
+  for (auto *A : Args) {
+    const Option &O = A->getOption();
+    if (O.matches(options::OPT_fcolor_diagnostics) ||
+        O.matches(options::OPT_fdiagnostics_color)) {
+      ShowColors = Colors_On;
+    } else if (O.matches(options::OPT_fno_color_diagnostics) ||
+               O.matches(options::OPT_fno_diagnostics_color)) {
+      ShowColors = Colors_Off;
+    } else if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
+      StringRef Value(A->getValue());
+      if (Value == "always")
+        ShowColors = Colors_On;
+      else if (Value == "never")
+        ShowColors = Colors_Off;
+      else if (Value == "auto")
+        ShowColors = Colors_Auto;
+    }
+  }
+  return ShowColors == Colors_On ||
+         (ShowColors == Colors_Auto &&
+          llvm::sys::Process::StandardErrHasColors());
+}
+
+static bool checkVerifyPrefixes(const std::vector<std::string> &VerifyPrefixes,
+                                DiagnosticsEngine &Diags) {
+  bool Success = true;
+  for (const auto &Prefix : VerifyPrefixes) {
+    // Every prefix must start with a letter and contain only alphanumeric
+    // characters, hyphens, and underscores.
+    auto BadChar = llvm::find_if(Prefix, [](char C) {
+      return !isAlphanumeric(C) && C != '-' && C != '_';
+    });
+    if (BadChar != Prefix.end() || !isLetter(Prefix[0])) {
+      Success = false;
+      Diags.Report(diag::err_drv_invalid_value) << "-verify=" << Prefix;
+      Diags.Report(diag::note_drv_verify_prefix_spelling);
+    }
+  }
+  return Success;
+}
+
+static void GenerateFileSystemArgs(const FileSystemOptions &Opts,
+                                   SmallVectorImpl<const char *> &Args,
+                                   CompilerInvocation::StringAllocator SA) {
+  const FileSystemOptions &FileSystemOpts = Opts;
+
+#define FILE_SYSTEM_OPTION_WITH_MARSHALLING(                                   \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef FILE_SYSTEM_OPTION_WITH_MARSHALLING
+}
+
+static bool ParseFileSystemArgs(FileSystemOptions &Opts, const ArgList &Args,
+                                DiagnosticsEngine &Diags) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  FileSystemOptions &FileSystemOpts = Opts;
+
+#define FILE_SYSTEM_OPTION_WITH_MARSHALLING(                                   \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef FILE_SYSTEM_OPTION_WITH_MARSHALLING
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static void GenerateMigratorArgs(const MigratorOptions &Opts,
+                                 SmallVectorImpl<const char *> &Args,
+                                 CompilerInvocation::StringAllocator SA) {
+  const MigratorOptions &MigratorOpts = Opts;
+#define MIGRATOR_OPTION_WITH_MARSHALLING(                                      \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef MIGRATOR_OPTION_WITH_MARSHALLING
+}
+
+static bool ParseMigratorArgs(MigratorOptions &Opts, const ArgList &Args,
+                              DiagnosticsEngine &Diags) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  MigratorOptions &MigratorOpts = Opts;
+
+#define MIGRATOR_OPTION_WITH_MARSHALLING(                                      \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef MIGRATOR_OPTION_WITH_MARSHALLING
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+void CompilerInvocation::GenerateDiagnosticArgs(
+    const DiagnosticOptions &Opts, SmallVectorImpl<const char *> &Args,
+    StringAllocator SA, bool DefaultDiagColor) {
+  const DiagnosticOptions *DiagnosticOpts = &Opts;
+#define DIAG_OPTION_WITH_MARSHALLING(                                          \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef DIAG_OPTION_WITH_MARSHALLING
+
+  if (!Opts.DiagnosticSerializationFile.empty())
+    GenerateArg(Args, OPT_diagnostic_serialized_file,
+                Opts.DiagnosticSerializationFile, SA);
+
+  if (Opts.ShowColors)
+    GenerateArg(Args, OPT_fcolor_diagnostics, SA);
+
+  if (Opts.VerifyDiagnostics &&
+      llvm::is_contained(Opts.VerifyPrefixes, "expected"))
+    GenerateArg(Args, OPT_verify, SA);
+
+  for (const auto &Prefix : Opts.VerifyPrefixes)
+    if (Prefix != "expected")
+      GenerateArg(Args, OPT_verify_EQ, Prefix, SA);
+
+  DiagnosticLevelMask VIU = Opts.getVerifyIgnoreUnexpected();
+  if (VIU == DiagnosticLevelMask::None) {
+    // This is the default, don't generate anything.
+  } else if (VIU == DiagnosticLevelMask::All) {
+    GenerateArg(Args, OPT_verify_ignore_unexpected, SA);
+  } else {
+    if (static_cast<unsigned>(VIU & DiagnosticLevelMask::Note) != 0)
+      GenerateArg(Args, OPT_verify_ignore_unexpected_EQ, "note", SA);
+    if (static_cast<unsigned>(VIU & DiagnosticLevelMask::Remark) != 0)
+      GenerateArg(Args, OPT_verify_ignore_unexpected_EQ, "remark", SA);
+    if (static_cast<unsigned>(VIU & DiagnosticLevelMask::Warning) != 0)
+      GenerateArg(Args, OPT_verify_ignore_unexpected_EQ, "warning", SA);
+    if (static_cast<unsigned>(VIU & DiagnosticLevelMask::Error) != 0)
+      GenerateArg(Args, OPT_verify_ignore_unexpected_EQ, "error", SA);
+  }
+
+  for (const auto &Warning : Opts.Warnings) {
+    // This option is automatically generated from UndefPrefixes.
+    if (Warning == "undef-prefix")
+      continue;
+    Args.push_back(SA(StringRef("-W") + Warning));
+  }
+
+  for (const auto &Remark : Opts.Remarks) {
+    // These arguments are generated from OptimizationRemark fields of
+    // CodeGenOptions.
+    StringRef IgnoredRemarks[] = {"pass",          "no-pass",
+                                  "pass-analysis", "no-pass-analysis",
+                                  "pass-missed",   "no-pass-missed"};
+    if (llvm::is_contained(IgnoredRemarks, Remark))
+      continue;
+
+    Args.push_back(SA(StringRef("-R") + Remark));
+  }
+}
+
+std::unique_ptr<DiagnosticOptions>
+clang::CreateAndPopulateDiagOpts(ArrayRef<const char *> Argv) {
+  auto DiagOpts = std::make_unique<DiagnosticOptions>();
+  unsigned MissingArgIndex, MissingArgCount;
+  InputArgList Args = getDriverOptTable().ParseArgs(
+      Argv.slice(1), MissingArgIndex, MissingArgCount);
+  // We ignore MissingArgCount and the return value of ParseDiagnosticArgs.
+  // Any errors that would be diagnosed here will also be diagnosed later,
+  // when the DiagnosticsEngine actually exists.
+  (void)ParseDiagnosticArgs(*DiagOpts, Args);
+  return DiagOpts;
+}
+
+bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
+                                DiagnosticsEngine *Diags,
+                                bool DefaultDiagColor) {
+  Optional<DiagnosticsEngine> IgnoringDiags;
+  if (!Diags) {
+    IgnoringDiags.emplace(new DiagnosticIDs(), new DiagnosticOptions(),
+                          new IgnoringDiagConsumer());
+    Diags = &*IgnoringDiags;
+  }
+
+  unsigned NumErrorsBefore = Diags->getNumErrors();
+
+  // The key paths of diagnostic options defined in Options.td start with
+  // "DiagnosticOpts->". Let's provide the expected variable name and type.
+  DiagnosticOptions *DiagnosticOpts = &Opts;
+
+#define DIAG_OPTION_WITH_MARSHALLING(                                          \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, *Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef DIAG_OPTION_WITH_MARSHALLING
+
+  llvm::sys::Process::UseANSIEscapeCodes(Opts.UseANSIEscapeCodes);
+
+  if (Arg *A =
+          Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
+    Opts.DiagnosticSerializationFile = A->getValue();
+  Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
+
+  Opts.VerifyDiagnostics = Args.hasArg(OPT_verify) || Args.hasArg(OPT_verify_EQ);
+  Opts.VerifyPrefixes = Args.getAllArgValues(OPT_verify_EQ);
+  if (Args.hasArg(OPT_verify))
+    Opts.VerifyPrefixes.push_back("expected");
+  // Keep VerifyPrefixes in its original order for the sake of diagnostics, and
+  // then sort it to prepare for fast lookup using std::binary_search.
+  if (!checkVerifyPrefixes(Opts.VerifyPrefixes, *Diags))
+    Opts.VerifyDiagnostics = false;
+  else
+    llvm::sort(Opts.VerifyPrefixes);
+  DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
+  parseDiagnosticLevelMask(
+      "-verify-ignore-unexpected=",
+      Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ), *Diags, DiagMask);
+  if (Args.hasArg(OPT_verify_ignore_unexpected))
+    DiagMask = DiagnosticLevelMask::All;
+  Opts.setVerifyIgnoreUnexpected(DiagMask);
+  if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
+    Opts.TabStop = DiagnosticOptions::DefaultTabStop;
+    Diags->Report(diag::warn_ignoring_ftabstop_value)
+        << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
+  }
+
+  addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
+  addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
+
+  return Diags->getNumErrors() == NumErrorsBefore;
+}
+
+/// Parse the argument to the -ftest-module-file-extension
+/// command-line argument.
+///
+/// \returns true on error, false on success.
+static bool parseTestModuleFileExtensionArg(StringRef Arg,
+                                            std::string &BlockName,
+                                            unsigned &MajorVersion,
+                                            unsigned &MinorVersion,
+                                            bool &Hashed,
+                                            std::string &UserInfo) {
+  SmallVector<StringRef, 5> Args;
+  Arg.split(Args, ':', 5);
+  if (Args.size() < 5)
+    return true;
+
+  BlockName = std::string(Args[0]);
+  if (Args[1].getAsInteger(10, MajorVersion)) return true;
+  if (Args[2].getAsInteger(10, MinorVersion)) return true;
+  if (Args[3].getAsInteger(2, Hashed)) return true;
+  if (Args.size() > 4)
+    UserInfo = std::string(Args[4]);
+  return false;
+}
+
+/// Return a table that associates command line option specifiers with the
+/// frontend action. Note: The pair {frontend::PluginAction, OPT_plugin} is
+/// intentionally missing, as this case is handled separately from other
+/// frontend options.
+static const auto &getFrontendActionTable() {
+  static const std::pair<frontend::ActionKind, unsigned> Table[] = {
+      {frontend::ASTDeclList, OPT_ast_list},
+
+      {frontend::ASTDump, OPT_ast_dump_all_EQ},
+      {frontend::ASTDump, OPT_ast_dump_all},
+      {frontend::ASTDump, OPT_ast_dump_EQ},
+      {frontend::ASTDump, OPT_ast_dump},
+      {frontend::ASTDump, OPT_ast_dump_lookups},
+      {frontend::ASTDump, OPT_ast_dump_decl_types},
+
+      {frontend::ASTPrint, OPT_ast_print},
+      {frontend::ASTView, OPT_ast_view},
+      {frontend::DumpCompilerOptions, OPT_compiler_options_dump},
+      {frontend::DumpRawTokens, OPT_dump_raw_tokens},
+      {frontend::DumpTokens, OPT_dump_tokens},
+      {frontend::EmitAssembly, OPT_S},
+      {frontend::EmitBC, OPT_emit_llvm_bc},
+      {frontend::EmitHTML, OPT_emit_html},
+      {frontend::EmitLLVM, OPT_emit_llvm},
+      {frontend::EmitLLVMOnly, OPT_emit_llvm_only},
+      {frontend::EmitCodeGenOnly, OPT_emit_codegen_only},
+      {frontend::EmitCodeGenOnly, OPT_emit_codegen_only},
+      {frontend::EmitObj, OPT_emit_obj},
+      {frontend::ExtractAPI, OPT_extract_api},
+
+      {frontend::FixIt, OPT_fixit_EQ},
+      {frontend::FixIt, OPT_fixit},
+
+      {frontend::GenerateModule, OPT_emit_module},
+      {frontend::GenerateModuleInterface, OPT_emit_module_interface},
+      {frontend::GenerateHeaderModule, OPT_emit_header_module},
+      {frontend::GeneratePCH, OPT_emit_pch},
+      {frontend::GenerateInterfaceStubs, OPT_emit_interface_stubs},
+      {frontend::InitOnly, OPT_init_only},
+      {frontend::ParseSyntaxOnly, OPT_fsyntax_only},
+      {frontend::ModuleFileInfo, OPT_module_file_info},
+      {frontend::VerifyPCH, OPT_verify_pch},
+      {frontend::PrintPreamble, OPT_print_preamble},
+      {frontend::PrintPreprocessedInput, OPT_E},
+      {frontend::TemplightDump, OPT_templight_dump},
+      {frontend::RewriteMacros, OPT_rewrite_macros},
+      {frontend::RewriteObjC, OPT_rewrite_objc},
+      {frontend::RewriteTest, OPT_rewrite_test},
+      {frontend::RunAnalysis, OPT_analyze},
+      {frontend::MigrateSource, OPT_migrate},
+      {frontend::RunPreprocessorOnly, OPT_Eonly},
+      {frontend::PrintDependencyDirectivesSourceMinimizerOutput,
+          OPT_print_dependency_directives_minimized_source},
+  };
+
+  return Table;
+}
+
+/// Maps command line option to frontend action.
+static Optional<frontend::ActionKind> getFrontendAction(OptSpecifier &Opt) {
+  for (const auto &ActionOpt : getFrontendActionTable())
+    if (ActionOpt.second == Opt.getID())
+      return ActionOpt.first;
+
+  return None;
+}
+
+/// Maps frontend action to command line option.
+static Optional<OptSpecifier>
+getProgramActionOpt(frontend::ActionKind ProgramAction) {
+  for (const auto &ActionOpt : getFrontendActionTable())
+    if (ActionOpt.first == ProgramAction)
+      return OptSpecifier(ActionOpt.second);
+
+  return None;
+}
+
+static void GenerateFrontendArgs(const FrontendOptions &Opts,
+                                 SmallVectorImpl<const char *> &Args,
+                                 CompilerInvocation::StringAllocator SA,
+                                 bool IsHeader) {
+  const FrontendOptions &FrontendOpts = Opts;
+#define FRONTEND_OPTION_WITH_MARSHALLING(                                      \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef FRONTEND_OPTION_WITH_MARSHALLING
+
+  Optional<OptSpecifier> ProgramActionOpt =
+      getProgramActionOpt(Opts.ProgramAction);
+
+  // Generating a simple flag covers most frontend actions.
+  std::function<void()> GenerateProgramAction = [&]() {
+    GenerateArg(Args, *ProgramActionOpt, SA);
+  };
+
+  if (!ProgramActionOpt) {
+    // PluginAction is the only program action handled separately.
+    assert(Opts.ProgramAction == frontend::PluginAction &&
+           "Frontend action without option.");
+    GenerateProgramAction = [&]() {
+      GenerateArg(Args, OPT_plugin, Opts.ActionName, SA);
+    };
+  }
+
+  // FIXME: Simplify the complex 'AST dump' command line.
+  if (Opts.ProgramAction == frontend::ASTDump) {
+    GenerateProgramAction = [&]() {
+      // ASTDumpLookups, ASTDumpDeclTypes and ASTDumpFilter are generated via
+      // marshalling infrastructure.
+
+      if (Opts.ASTDumpFormat != ADOF_Default) {
+        StringRef Format;
+        switch (Opts.ASTDumpFormat) {
+        case ADOF_Default:
+          llvm_unreachable("Default AST dump format.");
+        case ADOF_JSON:
+          Format = "json";
+          break;
+        }
+
+        if (Opts.ASTDumpAll)
+          GenerateArg(Args, OPT_ast_dump_all_EQ, Format, SA);
+        if (Opts.ASTDumpDecls)
+          GenerateArg(Args, OPT_ast_dump_EQ, Format, SA);
+      } else {
+        if (Opts.ASTDumpAll)
+          GenerateArg(Args, OPT_ast_dump_all, SA);
+        if (Opts.ASTDumpDecls)
+          GenerateArg(Args, OPT_ast_dump, SA);
+      }
+    };
+  }
+
+  if (Opts.ProgramAction == frontend::FixIt && !Opts.FixItSuffix.empty()) {
+    GenerateProgramAction = [&]() {
+      GenerateArg(Args, OPT_fixit_EQ, Opts.FixItSuffix, SA);
+    };
+  }
+
+  GenerateProgramAction();
+
+  for (const auto &PluginArgs : Opts.PluginArgs) {
+    Option Opt = getDriverOptTable().getOption(OPT_plugin_arg);
+    const char *Spelling =
+        SA(Opt.getPrefix() + Opt.getName() + PluginArgs.first);
+    for (const auto &PluginArg : PluginArgs.second)
+      denormalizeString(Args, Spelling, SA, Opt.getKind(), 0, PluginArg);
+  }
+
+  for (const auto &Ext : Opts.ModuleFileExtensions)
+    if (auto *TestExt = dyn_cast_or_null<TestModuleFileExtension>(Ext.get()))
+      GenerateArg(Args, OPT_ftest_module_file_extension_EQ, TestExt->str(), SA);
+
+  if (!Opts.CodeCompletionAt.FileName.empty())
+    GenerateArg(Args, OPT_code_completion_at, Opts.CodeCompletionAt.ToString(),
+                SA);
+
+  for (const auto &Plugin : Opts.Plugins)
+    GenerateArg(Args, OPT_load, Plugin, SA);
+
+  // ASTDumpDecls and ASTDumpAll already handled with ProgramAction.
+
+  for (const auto &ModuleFile : Opts.ModuleFiles)
+    GenerateArg(Args, OPT_fmodule_file, ModuleFile, SA);
+
+  if (Opts.AuxTargetCPU.hasValue())
+    GenerateArg(Args, OPT_aux_target_cpu, *Opts.AuxTargetCPU, SA);
+
+  if (Opts.AuxTargetFeatures.hasValue())
+    for (const auto &Feature : *Opts.AuxTargetFeatures)
+      GenerateArg(Args, OPT_aux_target_feature, Feature, SA);
+
+  {
+    StringRef Preprocessed = Opts.DashX.isPreprocessed() ? "-cpp-output" : "";
+    StringRef ModuleMap =
+        Opts.DashX.getFormat() == InputKind::ModuleMap ? "-module-map" : "";
+    StringRef Header = IsHeader ? "-header" : "";
+
+    StringRef Lang;
+    switch (Opts.DashX.getLanguage()) {
+    case Language::C:
+      Lang = "c";
+      break;
+    case Language::OpenCL:
+      Lang = "cl";
+      break;
+    case Language::OpenCLCXX:
+      Lang = "clcpp";
+      break;
+    case Language::CUDA:
+      Lang = "cuda";
+      break;
+    case Language::HIP:
+      Lang = "hip";
+      break;
+    case Language::CXX:
+      Lang = "c++";
+      break;
+    case Language::ObjC:
+      Lang = "objective-c";
+      break;
+    case Language::ObjCXX:
+      Lang = "objective-c++";
+      break;
+    case Language::RenderScript:
+      Lang = "renderscript";
+      break;
+    case Language::Asm:
+      Lang = "assembler-with-cpp";
+      break;
+    case Language::Unknown:
+      assert(Opts.DashX.getFormat() == InputKind::Precompiled &&
+             "Generating -x argument for unknown language (not precompiled).");
+      Lang = "ast";
+      break;
+    case Language::LLVM_IR:
+      Lang = "ir";
+      break;
+    }
+
+    GenerateArg(Args, OPT_x, Lang + Header + ModuleMap + Preprocessed, SA);
+  }
+
+  // OPT_INPUT has a unique class, generate it directly.
+  for (const auto &Input : Opts.Inputs)
+    Args.push_back(SA(Input.getFile()));
+}
+
+static bool ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
+                              DiagnosticsEngine &Diags, bool &IsHeaderFile) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  FrontendOptions &FrontendOpts = Opts;
+
+#define FRONTEND_OPTION_WITH_MARSHALLING(                                      \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef FRONTEND_OPTION_WITH_MARSHALLING
+
+  Opts.ProgramAction = frontend::ParseSyntaxOnly;
+  if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
+    OptSpecifier Opt = OptSpecifier(A->getOption().getID());
+    Optional<frontend::ActionKind> ProgramAction = getFrontendAction(Opt);
+    assert(ProgramAction && "Option specifier not in Action_Group.");
+
+    if (ProgramAction == frontend::ASTDump &&
+        (Opt == OPT_ast_dump_all_EQ || Opt == OPT_ast_dump_EQ)) {
+      unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
+                         .CaseLower("default", ADOF_Default)
+                         .CaseLower("json", ADOF_JSON)
+                         .Default(std::numeric_limits<unsigned>::max());
+
+      if (Val != std::numeric_limits<unsigned>::max())
+        Opts.ASTDumpFormat = static_cast<ASTDumpOutputFormat>(Val);
+      else {
+        Diags.Report(diag::err_drv_invalid_value)
+            << A->getAsString(Args) << A->getValue();
+        Opts.ASTDumpFormat = ADOF_Default;
+      }
+    }
+
+    if (ProgramAction == frontend::FixIt && Opt == OPT_fixit_EQ)
+      Opts.FixItSuffix = A->getValue();
+
+    if (ProgramAction == frontend::GenerateInterfaceStubs) {
+      StringRef ArgStr =
+          Args.hasArg(OPT_interface_stub_version_EQ)
+              ? Args.getLastArgValue(OPT_interface_stub_version_EQ)
+              : "ifs-v1";
+      if (ArgStr == "experimental-yaml-elf-v1" ||
+          ArgStr == "experimental-ifs-v1" || ArgStr == "experimental-ifs-v2" ||
+          ArgStr == "experimental-tapi-elf-v1") {
+        std::string ErrorMessage =
+            "Invalid interface stub format: " + ArgStr.str() +
+            " is deprecated.";
+        Diags.Report(diag::err_drv_invalid_value)
+            << "Must specify a valid interface stub format type, ie: "
+               "-interface-stub-version=ifs-v1"
+            << ErrorMessage;
+        ProgramAction = frontend::ParseSyntaxOnly;
+      } else if (!ArgStr.startswith("ifs-")) {
+        std::string ErrorMessage =
+            "Invalid interface stub format: " + ArgStr.str() + ".";
+        Diags.Report(diag::err_drv_invalid_value)
+            << "Must specify a valid interface stub format type, ie: "
+               "-interface-stub-version=ifs-v1"
+            << ErrorMessage;
+        ProgramAction = frontend::ParseSyntaxOnly;
+      }
+    }
+
+    Opts.ProgramAction = *ProgramAction;
+  }
+
+  if (const Arg* A = Args.getLastArg(OPT_plugin)) {
+    Opts.Plugins.emplace_back(A->getValue(0));
+    Opts.ProgramAction = frontend::PluginAction;
+    Opts.ActionName = A->getValue();
+  }
+  for (const auto *AA : Args.filtered(OPT_plugin_arg))
+    Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
+
+  for (const std::string &Arg :
+         Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
+    std::string BlockName;
+    unsigned MajorVersion;
+    unsigned MinorVersion;
+    bool Hashed;
+    std::string UserInfo;
+    if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
+                                        MinorVersion, Hashed, UserInfo)) {
+      Diags.Report(diag::err_test_module_file_extension_format) << Arg;
+
+      continue;
+    }
+
+    // Add the testing module file extension.
+    Opts.ModuleFileExtensions.push_back(
+        std::make_shared<TestModuleFileExtension>(
+            BlockName, MajorVersion, MinorVersion, Hashed, UserInfo));
+  }
+
+  if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
+    Opts.CodeCompletionAt =
+      ParsedSourceLocation::FromString(A->getValue());
+    if (Opts.CodeCompletionAt.FileName.empty())
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << A->getValue();
+  }
+
+  Opts.Plugins = Args.getAllArgValues(OPT_load);
+  Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump, OPT_ast_dump_EQ);
+  Opts.ASTDumpAll = Args.hasArg(OPT_ast_dump_all, OPT_ast_dump_all_EQ);
+  // Only the -fmodule-file=<file> form.
+  for (const auto *A : Args.filtered(OPT_fmodule_file)) {
+    StringRef Val = A->getValue();
+    if (!Val.contains('='))
+      Opts.ModuleFiles.push_back(std::string(Val));
+  }
+
+  if (Opts.ProgramAction != frontend::GenerateModule && Opts.IsSystemModule)
+    Diags.Report(diag::err_drv_argument_only_allowed_with) << "-fsystem-module"
+                                                           << "-emit-module";
+
+  if (Args.hasArg(OPT_aux_target_cpu))
+    Opts.AuxTargetCPU = std::string(Args.getLastArgValue(OPT_aux_target_cpu));
+  if (Args.hasArg(OPT_aux_target_feature))
+    Opts.AuxTargetFeatures = Args.getAllArgValues(OPT_aux_target_feature);
+
+  if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
+      Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
+    Diags.Report(diag::err_drv_argument_not_allowed_with)
+      << "ARC migration" << "ObjC migration";
+  }
+
+  InputKind DashX(Language::Unknown);
+  if (const Arg *A = Args.getLastArg(OPT_x)) {
+    StringRef XValue = A->getValue();
+
+    // Parse suffixes: '<lang>(-header|[-module-map][-cpp-output])'.
+    // FIXME: Supporting '<lang>-header-cpp-output' would be useful.
+    bool Preprocessed = XValue.consume_back("-cpp-output");
+    bool ModuleMap = XValue.consume_back("-module-map");
+    IsHeaderFile = !Preprocessed && !ModuleMap &&
+                   XValue != "precompiled-header" &&
+                   XValue.consume_back("-header");
+
+    // Principal languages.
+    DashX = llvm::StringSwitch<InputKind>(XValue)
+                .Case("c", Language::C)
+                .Case("cl", Language::OpenCL)
+                .Case("clcpp", Language::OpenCLCXX)
+                .Case("cuda", Language::CUDA)
+                .Case("hip", Language::HIP)
+                .Case("c++", Language::CXX)
+                .Case("objective-c", Language::ObjC)
+                .Case("objective-c++", Language::ObjCXX)
+                .Case("renderscript", Language::RenderScript)
+                .Default(Language::Unknown);
+
+    // "objc[++]-cpp-output" is an acceptable synonym for
+    // "objective-c[++]-cpp-output".
+    if (DashX.isUnknown() && Preprocessed && !IsHeaderFile && !ModuleMap)
+      DashX = llvm::StringSwitch<InputKind>(XValue)
+                  .Case("objc", Language::ObjC)
+                  .Case("objc++", Language::ObjCXX)
+                  .Default(Language::Unknown);
+
+    // Some special cases cannot be combined with suffixes.
+    if (DashX.isUnknown() && !Preprocessed && !ModuleMap && !IsHeaderFile)
+      DashX = llvm::StringSwitch<InputKind>(XValue)
+                  .Case("cpp-output", InputKind(Language::C).getPreprocessed())
+                  .Case("assembler-with-cpp", Language::Asm)
+                  .Cases("ast", "pcm", "precompiled-header",
+                         InputKind(Language::Unknown, InputKind::Precompiled))
+                  .Case("ir", Language::LLVM_IR)
+                  .Default(Language::Unknown);
+
+    if (DashX.isUnknown())
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << A->getValue();
+
+    if (Preprocessed)
+      DashX = DashX.getPreprocessed();
+    if (ModuleMap)
+      DashX = DashX.withFormat(InputKind::ModuleMap);
+  }
+
+  // '-' is the default input if none is given.
+  std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
+  Opts.Inputs.clear();
+  if (Inputs.empty())
+    Inputs.push_back("-");
+  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
+    InputKind IK = DashX;
+    if (IK.isUnknown()) {
+      IK = FrontendOptions::getInputKindForExtension(
+        StringRef(Inputs[i]).rsplit('.').second);
+      // FIXME: Warn on this?
+      if (IK.isUnknown())
+        IK = Language::C;
+      // FIXME: Remove this hack.
+      if (i == 0)
+        DashX = IK;
+    }
+
+    bool IsSystem = false;
+
+    // The -emit-module action implicitly takes a module map.
+    if (Opts.ProgramAction == frontend::GenerateModule &&
+        IK.getFormat() == InputKind::Source) {
+      IK = IK.withFormat(InputKind::ModuleMap);
+      IsSystem = Opts.IsSystemModule;
+    }
+
+    Opts.Inputs.emplace_back(std::move(Inputs[i]), IK, IsSystem);
+  }
+
+  Opts.DashX = DashX;
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
+                                                 void *MainAddr) {
+  std::string ClangExecutable =
+      llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
+  return Driver::GetResourcesPath(ClangExecutable, CLANG_RESOURCE_DIR);
+}
+
+static void GenerateHeaderSearchArgs(HeaderSearchOptions &Opts,
+                                     SmallVectorImpl<const char *> &Args,
+                                     CompilerInvocation::StringAllocator SA) {
+  const HeaderSearchOptions *HeaderSearchOpts = &Opts;
+#define HEADER_SEARCH_OPTION_WITH_MARSHALLING(                                 \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef HEADER_SEARCH_OPTION_WITH_MARSHALLING
+
+  if (Opts.UseLibcxx)
+    GenerateArg(Args, OPT_stdlib_EQ, "libc++", SA);
+
+  if (!Opts.ModuleCachePath.empty())
+    GenerateArg(Args, OPT_fmodules_cache_path, Opts.ModuleCachePath, SA);
+
+  for (const auto &File : Opts.PrebuiltModuleFiles)
+    GenerateArg(Args, OPT_fmodule_file, File.first + "=" + File.second, SA);
+
+  for (const auto &Path : Opts.PrebuiltModulePaths)
+    GenerateArg(Args, OPT_fprebuilt_module_path, Path, SA);
+
+  for (const auto &Macro : Opts.ModulesIgnoreMacros)
+    GenerateArg(Args, OPT_fmodules_ignore_macro, Macro.val(), SA);
+
+  auto Matches = [](const HeaderSearchOptions::Entry &Entry,
+                    llvm::ArrayRef<frontend::IncludeDirGroup> Groups,
+                    llvm::Optional<bool> IsFramework,
+                    llvm::Optional<bool> IgnoreSysRoot) {
+    return llvm::is_contained(Groups, Entry.Group) &&
+           (!IsFramework || (Entry.IsFramework == *IsFramework)) &&
+           (!IgnoreSysRoot || (Entry.IgnoreSysRoot == *IgnoreSysRoot));
+  };
+
+  auto It = Opts.UserEntries.begin();
+  auto End = Opts.UserEntries.end();
+
+  // Add -I..., -F..., and -index-header-map options in order.
+  for (; It < End &&
+         Matches(*It, {frontend::IndexHeaderMap, frontend::Angled}, None, true);
+       ++It) {
+    OptSpecifier Opt = [It, Matches]() {
+      if (Matches(*It, frontend::IndexHeaderMap, true, true))
+        return OPT_F;
+      if (Matches(*It, frontend::IndexHeaderMap, false, true))
+        return OPT_I;
+      if (Matches(*It, frontend::Angled, true, true))
+        return OPT_F;
+      if (Matches(*It, frontend::Angled, false, true))
+        return OPT_I;
+      llvm_unreachable("Unexpected HeaderSearchOptions::Entry.");
+    }();
+
+    if (It->Group == frontend::IndexHeaderMap)
+      GenerateArg(Args, OPT_index_header_map, SA);
+    GenerateArg(Args, Opt, It->Path, SA);
+  };
+
+  // Note: some paths that came from "[-iprefix=xx] -iwithprefixbefore=yy" may
+  // have already been generated as "-I[xx]yy". If that's the case, their
+  // position on command line was such that this has no semantic impact on
+  // include paths.
+  for (; It < End &&
+         Matches(*It, {frontend::After, frontend::Angled}, false, true);
+       ++It) {
+    OptSpecifier Opt =
+        It->Group == frontend::After ? OPT_iwithprefix : OPT_iwithprefixbefore;
+    GenerateArg(Args, Opt, It->Path, SA);
+  }
+
+  // Note: Some paths that came from "-idirafter=xxyy" may have already been
+  // generated as "-iwithprefix=xxyy". If that's the case, their position on
+  // command line was such that this has no semantic impact on include paths.
+  for (; It < End && Matches(*It, {frontend::After}, false, true); ++It)
+    GenerateArg(Args, OPT_idirafter, It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::Quoted}, false, true); ++It)
+    GenerateArg(Args, OPT_iquote, It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::System}, false, None); ++It)
+    GenerateArg(Args, It->IgnoreSysRoot ? OPT_isystem : OPT_iwithsysroot,
+                It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::System}, true, true); ++It)
+    GenerateArg(Args, OPT_iframework, It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::System}, true, false); ++It)
+    GenerateArg(Args, OPT_iframeworkwithsysroot, It->Path, SA);
+
+  // Add the paths for the various language specific isystem flags.
+  for (; It < End && Matches(*It, {frontend::CSystem}, false, true); ++It)
+    GenerateArg(Args, OPT_c_isystem, It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::CXXSystem}, false, true); ++It)
+    GenerateArg(Args, OPT_cxx_isystem, It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::ObjCSystem}, false, true); ++It)
+    GenerateArg(Args, OPT_objc_isystem, It->Path, SA);
+  for (; It < End && Matches(*It, {frontend::ObjCXXSystem}, false, true); ++It)
+    GenerateArg(Args, OPT_objcxx_isystem, It->Path, SA);
+
+  // Add the internal paths from a driver that detects standard include paths.
+  // Note: Some paths that came from "-internal-isystem" arguments may have
+  // already been generated as "-isystem". If that's the case, their position on
+  // command line was such that this has no semantic impact on include paths.
+  for (; It < End &&
+         Matches(*It, {frontend::System, frontend::ExternCSystem}, false, true);
+       ++It) {
+    OptSpecifier Opt = It->Group == frontend::System
+                           ? OPT_internal_isystem
+                           : OPT_internal_externc_isystem;
+    GenerateArg(Args, Opt, It->Path, SA);
+  }
+
+  assert(It == End && "Unhandled HeaderSearchOption::Entry.");
+
+  // Add the path prefixes which are implicitly treated as being system headers.
+  for (const auto &P : Opts.SystemHeaderPrefixes) {
+    OptSpecifier Opt = P.IsSystemHeader ? OPT_system_header_prefix
+                                        : OPT_no_system_header_prefix;
+    GenerateArg(Args, Opt, P.Prefix, SA);
+  }
+
+  for (const std::string &F : Opts.VFSOverlayFiles)
+    GenerateArg(Args, OPT_ivfsoverlay, F, SA);
+}
+
+static bool ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
+                                  DiagnosticsEngine &Diags,
+                                  const std::string &WorkingDir) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  HeaderSearchOptions *HeaderSearchOpts = &Opts;
+
+#define HEADER_SEARCH_OPTION_WITH_MARSHALLING(                                 \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef HEADER_SEARCH_OPTION_WITH_MARSHALLING
+
+  if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
+    Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
+
+  // Canonicalize -fmodules-cache-path before storing it.
+  SmallString<128> P(Args.getLastArgValue(OPT_fmodules_cache_path));
+  if (!(P.empty() || llvm::sys::path::is_absolute(P))) {
+    if (WorkingDir.empty())
+      llvm::sys::fs::make_absolute(P);
+    else
+      llvm::sys::fs::make_absolute(WorkingDir, P);
+  }
+  llvm::sys::path::remove_dots(P);
+  Opts.ModuleCachePath = std::string(P.str());
+
+  // Only the -fmodule-file=<name>=<file> form.
+  for (const auto *A : Args.filtered(OPT_fmodule_file)) {
+    StringRef Val = A->getValue();
+    if (Val.contains('=')) {
+      auto Split = Val.split('=');
+      Opts.PrebuiltModuleFiles.insert(
+          {std::string(Split.first), std::string(Split.second)});
+    }
+  }
+  for (const auto *A : Args.filtered(OPT_fprebuilt_module_path))
+    Opts.AddPrebuiltModulePath(A->getValue());
+
+  for (const auto *A : Args.filtered(OPT_fmodules_ignore_macro)) {
+    StringRef MacroDef = A->getValue();
+    Opts.ModulesIgnoreMacros.insert(
+        llvm::CachedHashString(MacroDef.split('=').first));
+  }
+
+  // Add -I..., -F..., and -index-header-map options in order.
+  bool IsIndexHeaderMap = false;
+  bool IsSysrootSpecified =
+      Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
+  for (const auto *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
+    if (A->getOption().matches(OPT_index_header_map)) {
+      // -index-header-map applies to the next -I or -F.
+      IsIndexHeaderMap = true;
+      continue;
+    }
+
+    frontend::IncludeDirGroup Group =
+        IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
+
+    bool IsFramework = A->getOption().matches(OPT_F);
+    std::string Path = A->getValue();
+
+    if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
+      SmallString<32> Buffer;
+      llvm::sys::path::append(Buffer, Opts.Sysroot,
+                              llvm::StringRef(A->getValue()).substr(1));
+      Path = std::string(Buffer.str());
+    }
+
+    Opts.AddPath(Path, Group, IsFramework,
+                 /*IgnoreSysroot*/ true);
+    IsIndexHeaderMap = false;
+  }
+
+  // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
+  StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
+  for (const auto *A :
+       Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
+    if (A->getOption().matches(OPT_iprefix))
+      Prefix = A->getValue();
+    else if (A->getOption().matches(OPT_iwithprefix))
+      Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
+    else
+      Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
+  }
+
+  for (const auto *A : Args.filtered(OPT_idirafter))
+    Opts.AddPath(A->getValue(), frontend::After, false, true);
+  for (const auto *A : Args.filtered(OPT_iquote))
+    Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
+  for (const auto *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
+    Opts.AddPath(A->getValue(), frontend::System, false,
+                 !A->getOption().matches(OPT_iwithsysroot));
+  for (const auto *A : Args.filtered(OPT_iframework))
+    Opts.AddPath(A->getValue(), frontend::System, true, true);
+  for (const auto *A : Args.filtered(OPT_iframeworkwithsysroot))
+    Opts.AddPath(A->getValue(), frontend::System, /*IsFramework=*/true,
+                 /*IgnoreSysRoot=*/false);
+
+  // Add the paths for the various language specific isystem flags.
+  for (const auto *A : Args.filtered(OPT_c_isystem))
+    Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
+  for (const auto *A : Args.filtered(OPT_cxx_isystem))
+    Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
+  for (const auto *A : Args.filtered(OPT_objc_isystem))
+    Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
+  for (const auto *A : Args.filtered(OPT_objcxx_isystem))
+    Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
+
+  // Add the internal paths from a driver that detects standard include paths.
+  for (const auto *A :
+       Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
+    frontend::IncludeDirGroup Group = frontend::System;
+    if (A->getOption().matches(OPT_internal_externc_isystem))
+      Group = frontend::ExternCSystem;
+    Opts.AddPath(A->getValue(), Group, false, true);
+  }
+
+  // Add the path prefixes which are implicitly treated as being system headers.
+  for (const auto *A :
+       Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
+    Opts.AddSystemHeaderPrefix(
+        A->getValue(), A->getOption().matches(OPT_system_header_prefix));
+
+  for (const auto *A : Args.filtered(OPT_ivfsoverlay))
+    Opts.AddVFSOverlayFile(A->getValue());
+
+  Opts.CaseInsensitive = Args.hasArg(OPT_fcase_insensitive_paths);
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
+                                         const llvm::Triple &T,
+                                         std::vector<std::string> &Includes,
+                                         LangStandard::Kind LangStd) {
+  // Set some properties which depend solely on the input kind; it would be nice
+  // to move these to the language standard, and have the driver resolve the
+  // input kind + language standard.
+  //
+  // FIXME: Perhaps a better model would be for a single source file to have
+  // multiple language standards (C / C++ std, ObjC std, OpenCL std, OpenMP std)
+  // simultaneously active?
+  if (IK.getLanguage() == Language::Asm) {
+    Opts.AsmPreprocessor = 1;
+  } else if (IK.isObjectiveC()) {
+    Opts.ObjC = 1;
+  }
+
+  if (LangStd == LangStandard::lang_unspecified) {
+    // Based on the base language, pick one.
+    switch (IK.getLanguage()) {
+    case Language::Unknown:
+    case Language::LLVM_IR:
+      llvm_unreachable("Invalid input kind!");
+    case Language::OpenCL:
+      LangStd = LangStandard::lang_opencl12;
+      break;
+    case Language::OpenCLCXX:
+      LangStd = LangStandard::lang_openclcpp10;
+      break;
+    case Language::CUDA:
+      LangStd = LangStandard::lang_cuda;
+      break;
+    case Language::Asm:
+    case Language::C:
+#if defined(CLANG_DEFAULT_STD_C)
+      LangStd = CLANG_DEFAULT_STD_C;
+#else
+      // The PS4 uses C99 as the default C standard.
+      if (T.isPS4())
+        LangStd = LangStandard::lang_gnu99;
+      else
+        LangStd = LangStandard::lang_gnu17;
+#endif
+      break;
+    case Language::ObjC:
+#if defined(CLANG_DEFAULT_STD_C)
+      LangStd = CLANG_DEFAULT_STD_C;
+#else
+      LangStd = LangStandard::lang_gnu11;
+#endif
+      break;
+    case Language::CXX:
+    case Language::ObjCXX:
+#if defined(CLANG_DEFAULT_STD_CXX)
+      LangStd = CLANG_DEFAULT_STD_CXX;
+#else
+      LangStd = LangStandard::lang_gnucxx14;
+#endif
+      break;
+    case Language::RenderScript:
+      LangStd = LangStandard::lang_c99;
+      break;
+    case Language::HIP:
+      LangStd = LangStandard::lang_hip;
+      break;
+    }
+  }
+
+  const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
+  Opts.LangStd = LangStd;
+  Opts.LineComment = Std.hasLineComments();
+  Opts.C99 = Std.isC99();
+  Opts.C11 = Std.isC11();
+  Opts.C17 = Std.isC17();
+  Opts.C2x = Std.isC2x();
+  Opts.CPlusPlus = Std.isCPlusPlus();
+  Opts.CPlusPlus11 = Std.isCPlusPlus11();
+  Opts.CPlusPlus14 = Std.isCPlusPlus14();
+  Opts.CPlusPlus17 = Std.isCPlusPlus17();
+  Opts.CPlusPlus20 = Std.isCPlusPlus20();
+  Opts.CPlusPlus2b = Std.isCPlusPlus2b();
+  Opts.GNUMode = Std.isGNUMode();
+  Opts.GNUCVersion = 0;
+  Opts.HexFloats = Std.hasHexFloats();
+  Opts.ImplicitInt = Std.hasImplicitInt();
+
+  // Set OpenCL Version.
+  Opts.OpenCL = Std.isOpenCL();
+  if (LangStd == LangStandard::lang_opencl10)
+    Opts.OpenCLVersion = 100;
+  else if (LangStd == LangStandard::lang_opencl11)
+    Opts.OpenCLVersion = 110;
+  else if (LangStd == LangStandard::lang_opencl12)
+    Opts.OpenCLVersion = 120;
+  else if (LangStd == LangStandard::lang_opencl20)
+    Opts.OpenCLVersion = 200;
+  else if (LangStd == LangStandard::lang_opencl30)
+    Opts.OpenCLVersion = 300;
+  else if (LangStd == LangStandard::lang_openclcpp10)
+    Opts.OpenCLCPlusPlusVersion = 100;
+  else if (LangStd == LangStandard::lang_openclcpp2021)
+    Opts.OpenCLCPlusPlusVersion = 202100;
+
+  // OpenCL has some additional defaults.
+  if (Opts.OpenCL) {
+    Opts.AltiVec = 0;
+    Opts.ZVector = 0;
+    Opts.setDefaultFPContractMode(LangOptions::FPM_On);
+    Opts.OpenCLCPlusPlus = Opts.CPlusPlus;
+    Opts.OpenCLPipes = Opts.getOpenCLCompatibleVersion() == 200;
+    Opts.OpenCLGenericAddressSpace = Opts.getOpenCLCompatibleVersion() == 200;
+
+    // Include default header file for OpenCL.
+    if (Opts.IncludeDefaultHeader) {
+      if (Opts.DeclareOpenCLBuiltins) {
+        // Only include base header file for builtin types and constants.
+        Includes.push_back("opencl-c-base.h");
+      } else {
+        Includes.push_back("opencl-c.h");
+      }
+    }
+  }
+
+  Opts.HIP = IK.getLanguage() == Language::HIP;
+  Opts.CUDA = IK.getLanguage() == Language::CUDA || Opts.HIP;
+  if (Opts.HIP) {
+    // HIP toolchain does not support 'Fast' FPOpFusion in backends since it
+    // fuses multiplication/addition instructions without contract flag from
+    // device library functions in LLVM bitcode, which causes accuracy loss in
+    // certain math functions, e.g. tan(-1e20) becomes -0.933 instead of 0.8446.
+    // For device library functions in bitcode to work, 'Strict' or 'Standard'
+    // FPOpFusion options in backends is needed. Therefore 'fast-honor-pragmas'
+    // FP contract option is used to allow fuse across statements in frontend
+    // whereas respecting contract flag in backend.
+    Opts.setDefaultFPContractMode(LangOptions::FPM_FastHonorPragmas);
+  } else if (Opts.CUDA) {
+    // Allow fuse across statements disregarding pragmas.
+    Opts.setDefaultFPContractMode(LangOptions::FPM_Fast);
+  }
+
+  Opts.RenderScript = IK.getLanguage() == Language::RenderScript;
+
+  // OpenCL and C++ both have bool, true, false keywords.
+  Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
+
+  // OpenCL has half keyword
+  Opts.Half = Opts.OpenCL;
+}
+
+/// Check if input file kind and language standard are compatible.
+static bool IsInputCompatibleWithStandard(InputKind IK,
+                                          const LangStandard &S) {
+  switch (IK.getLanguage()) {
+  case Language::Unknown:
+  case Language::LLVM_IR:
+    llvm_unreachable("should not parse language flags for this input");
+
+  case Language::C:
+  case Language::ObjC:
+  case Language::RenderScript:
+    return S.getLanguage() == Language::C;
+
+  case Language::OpenCL:
+    return S.getLanguage() == Language::OpenCL ||
+           S.getLanguage() == Language::OpenCLCXX;
+
+  case Language::OpenCLCXX:
+    return S.getLanguage() == Language::OpenCLCXX;
+
+  case Language::CXX:
+  case Language::ObjCXX:
+    return S.getLanguage() == Language::CXX;
+
+  case Language::CUDA:
+    // FIXME: What -std= values should be permitted for CUDA compilations?
+    return S.getLanguage() == Language::CUDA ||
+           S.getLanguage() == Language::CXX;
+
+  case Language::HIP:
+    return S.getLanguage() == Language::CXX || S.getLanguage() == Language::HIP;
+
+  case Language::Asm:
+    // Accept (and ignore) all -std= values.
+    // FIXME: The -std= value is not ignored; it affects the tokenization
+    // and preprocessing rules if we're preprocessing this asm input.
+    return true;
+  }
+
+  llvm_unreachable("unexpected input language");
+}
+
+/// Get language name for given input kind.
+static StringRef GetInputKindName(InputKind IK) {
+  switch (IK.getLanguage()) {
+  case Language::C:
+    return "C";
+  case Language::ObjC:
+    return "Objective-C";
+  case Language::CXX:
+    return "C++";
+  case Language::ObjCXX:
+    return "Objective-C++";
+  case Language::OpenCL:
+    return "OpenCL";
+  case Language::OpenCLCXX:
+    return "C++ for OpenCL";
+  case Language::CUDA:
+    return "CUDA";
+  case Language::RenderScript:
+    return "RenderScript";
+  case Language::HIP:
+    return "HIP";
+
+  case Language::Asm:
+    return "Asm";
+  case Language::LLVM_IR:
+    return "LLVM IR";
+
+  case Language::Unknown:
+    break;
+  }
+  llvm_unreachable("unknown input language");
+}
+
+void CompilerInvocation::GenerateLangArgs(const LangOptions &Opts,
+                                          SmallVectorImpl<const char *> &Args,
+                                          StringAllocator SA,
+                                          const llvm::Triple &T, InputKind IK) {
+  if (IK.getFormat() == InputKind::Precompiled ||
+      IK.getLanguage() == Language::LLVM_IR) {
+    if (Opts.ObjCAutoRefCount)
+      GenerateArg(Args, OPT_fobjc_arc, SA);
+    if (Opts.PICLevel != 0)
+      GenerateArg(Args, OPT_pic_level, Twine(Opts.PICLevel), SA);
+    if (Opts.PIE)
+      GenerateArg(Args, OPT_pic_is_pie, SA);
+    for (StringRef Sanitizer : serializeSanitizerKinds(Opts.Sanitize))
+      GenerateArg(Args, OPT_fsanitize_EQ, Sanitizer, SA);
+
+    return;
+  }
+
+  OptSpecifier StdOpt;
+  switch (Opts.LangStd) {
+  case LangStandard::lang_opencl10:
+  case LangStandard::lang_opencl11:
+  case LangStandard::lang_opencl12:
+  case LangStandard::lang_opencl20:
+  case LangStandard::lang_opencl30:
+  case LangStandard::lang_openclcpp10:
+  case LangStandard::lang_openclcpp2021:
+    StdOpt = OPT_cl_std_EQ;
+    break;
+  default:
+    StdOpt = OPT_std_EQ;
+    break;
+  }
+
+  auto LangStandard = LangStandard::getLangStandardForKind(Opts.LangStd);
+  GenerateArg(Args, StdOpt, LangStandard.getName(), SA);
+
+  if (Opts.IncludeDefaultHeader)
+    GenerateArg(Args, OPT_finclude_default_header, SA);
+  if (Opts.DeclareOpenCLBuiltins)
+    GenerateArg(Args, OPT_fdeclare_opencl_builtins, SA);
+
+  const LangOptions *LangOpts = &Opts;
+
+#define LANG_OPTION_WITH_MARSHALLING(                                          \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef LANG_OPTION_WITH_MARSHALLING
+
+  // The '-fcf-protection=' option is generated by CodeGenOpts generator.
+
+  if (Opts.ObjC) {
+    GenerateArg(Args, OPT_fobjc_runtime_EQ, Opts.ObjCRuntime.getAsString(), SA);
+
+    if (Opts.GC == LangOptions::GCOnly)
+      GenerateArg(Args, OPT_fobjc_gc_only, SA);
+    else if (Opts.GC == LangOptions::HybridGC)
+      GenerateArg(Args, OPT_fobjc_gc, SA);
+    else if (Opts.ObjCAutoRefCount == 1)
+      GenerateArg(Args, OPT_fobjc_arc, SA);
+
+    if (Opts.ObjCWeakRuntime)
+      GenerateArg(Args, OPT_fobjc_runtime_has_weak, SA);
+
+    if (Opts.ObjCWeak)
+      GenerateArg(Args, OPT_fobjc_weak, SA);
+
+    if (Opts.ObjCSubscriptingLegacyRuntime)
+      GenerateArg(Args, OPT_fobjc_subscripting_legacy_runtime, SA);
+  }
+
+  if (Opts.GNUCVersion != 0) {
+    unsigned Major = Opts.GNUCVersion / 100 / 100;
+    unsigned Minor = (Opts.GNUCVersion / 100) % 100;
+    unsigned Patch = Opts.GNUCVersion % 100;
+    GenerateArg(Args, OPT_fgnuc_version_EQ,
+                Twine(Major) + "." + Twine(Minor) + "." + Twine(Patch), SA);
+  }
+
+  if (Opts.IgnoreXCOFFVisibility)
+    GenerateArg(Args, OPT_mignore_xcoff_visibility, SA);
+
+  if (Opts.SignedOverflowBehavior == LangOptions::SOB_Trapping) {
+    GenerateArg(Args, OPT_ftrapv, SA);
+    GenerateArg(Args, OPT_ftrapv_handler, Opts.OverflowHandler, SA);
+  } else if (Opts.SignedOverflowBehavior == LangOptions::SOB_Defined) {
+    GenerateArg(Args, OPT_fwrapv, SA);
+  }
+
+  if (Opts.MSCompatibilityVersion != 0) {
+    unsigned Major = Opts.MSCompatibilityVersion / 10000000;
+    unsigned Minor = (Opts.MSCompatibilityVersion / 100000) % 100;
+    unsigned Subminor = Opts.MSCompatibilityVersion % 100000;
+    GenerateArg(Args, OPT_fms_compatibility_version,
+                Twine(Major) + "." + Twine(Minor) + "." + Twine(Subminor), SA);
+  }
+
+  if ((!Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus17) || T.isOSzOS()) {
+    if (!Opts.Trigraphs)
+      GenerateArg(Args, OPT_fno_trigraphs, SA);
+  } else {
+    if (Opts.Trigraphs)
+      GenerateArg(Args, OPT_ftrigraphs, SA);
+  }
+
+  if (Opts.Blocks && !(Opts.OpenCL && Opts.OpenCLVersion == 200))
+    GenerateArg(Args, OPT_fblocks, SA);
+
+  if (Opts.ConvergentFunctions &&
+      !(Opts.OpenCL || (Opts.CUDA && Opts.CUDAIsDevice) || Opts.SYCLIsDevice))
+    GenerateArg(Args, OPT_fconvergent_functions, SA);
+
+  if (Opts.NoBuiltin && !Opts.Freestanding)
+    GenerateArg(Args, OPT_fno_builtin, SA);
+
+  if (!Opts.NoBuiltin)
+    for (const auto &Func : Opts.NoBuiltinFuncs)
+      GenerateArg(Args, OPT_fno_builtin_, Func, SA);
+
+  if (Opts.LongDoubleSize == 128)
+    GenerateArg(Args, OPT_mlong_double_128, SA);
+  else if (Opts.LongDoubleSize == 64)
+    GenerateArg(Args, OPT_mlong_double_64, SA);
+
+  // Not generating '-mrtd', it's just an alias for '-fdefault-calling-conv='.
+
+  // OpenMP was requested via '-fopenmp', not implied by '-fopenmp-simd' or
+  // '-fopenmp-targets='.
+  if (Opts.OpenMP && !Opts.OpenMPSimd) {
+    GenerateArg(Args, OPT_fopenmp, SA);
+
+    if (Opts.OpenMP != 50)
+      GenerateArg(Args, OPT_fopenmp_version_EQ, Twine(Opts.OpenMP), SA);
+
+    if (!Opts.OpenMPUseTLS)
+      GenerateArg(Args, OPT_fnoopenmp_use_tls, SA);
+
+    if (Opts.OpenMPIsDevice)
+      GenerateArg(Args, OPT_fopenmp_is_device, SA);
+
+    if (Opts.OpenMPIRBuilder)
+      GenerateArg(Args, OPT_fopenmp_enable_irbuilder, SA);
+  }
+
+  if (Opts.OpenMPSimd) {
+    GenerateArg(Args, OPT_fopenmp_simd, SA);
+
+    if (Opts.OpenMP != 50)
+      GenerateArg(Args, OPT_fopenmp_version_EQ, Twine(Opts.OpenMP), SA);
+  }
+
+  if (Opts.OpenMPTargetNewRuntime)
+    GenerateArg(Args, OPT_fopenmp_target_new_runtime, SA);
+
+  if (Opts.OpenMPThreadSubscription)
+    GenerateArg(Args, OPT_fopenmp_assume_threads_oversubscription, SA);
+
+  if (Opts.OpenMPTeamSubscription)
+    GenerateArg(Args, OPT_fopenmp_assume_teams_oversubscription, SA);
+
+  if (Opts.OpenMPTargetDebug != 0)
+    GenerateArg(Args, OPT_fopenmp_target_debug_EQ,
+                Twine(Opts.OpenMPTargetDebug), SA);
+
+  if (Opts.OpenMPCUDANumSMs != 0)
+    GenerateArg(Args, OPT_fopenmp_cuda_number_of_sm_EQ,
+                Twine(Opts.OpenMPCUDANumSMs), SA);
+
+  if (Opts.OpenMPCUDABlocksPerSM != 0)
+    GenerateArg(Args, OPT_fopenmp_cuda_blocks_per_sm_EQ,
+                Twine(Opts.OpenMPCUDABlocksPerSM), SA);
+
+  if (Opts.OpenMPCUDAReductionBufNum != 1024)
+    GenerateArg(Args, OPT_fopenmp_cuda_teams_reduction_recs_num_EQ,
+                Twine(Opts.OpenMPCUDAReductionBufNum), SA);
+
+  if (!Opts.OMPTargetTriples.empty()) {
+    std::string Targets;
+    llvm::raw_string_ostream OS(Targets);
+    llvm::interleave(
+        Opts.OMPTargetTriples, OS,
+        [&OS](const llvm::Triple &T) { OS << T.str(); }, ",");
+    GenerateArg(Args, OPT_fopenmp_targets_EQ, OS.str(), SA);
+  }
+
+  if (!Opts.OMPHostIRFile.empty())
+    GenerateArg(Args, OPT_fopenmp_host_ir_file_path, Opts.OMPHostIRFile, SA);
+
+  if (Opts.OpenMPCUDAMode)
+    GenerateArg(Args, OPT_fopenmp_cuda_mode, SA);
+
+  if (Opts.OpenMPCUDAForceFullRuntime)
+    GenerateArg(Args, OPT_fopenmp_cuda_force_full_runtime, SA);
+
+  // The arguments used to set Optimize, OptimizeSize and NoInlineDefine are
+  // generated from CodeGenOptions.
+
+  if (Opts.DefaultFPContractMode == LangOptions::FPM_Fast)
+    GenerateArg(Args, OPT_ffp_contract, "fast", SA);
+  else if (Opts.DefaultFPContractMode == LangOptions::FPM_On)
+    GenerateArg(Args, OPT_ffp_contract, "on", SA);
+  else if (Opts.DefaultFPContractMode == LangOptions::FPM_Off)
+    GenerateArg(Args, OPT_ffp_contract, "off", SA);
+  else if (Opts.DefaultFPContractMode == LangOptions::FPM_FastHonorPragmas)
+    GenerateArg(Args, OPT_ffp_contract, "fast-honor-pragmas", SA);
+
+  for (StringRef Sanitizer : serializeSanitizerKinds(Opts.Sanitize))
+    GenerateArg(Args, OPT_fsanitize_EQ, Sanitizer, SA);
+
+  // Conflating '-fsanitize-system-ignorelist' and '-fsanitize-ignorelist'.
+  for (const std::string &F : Opts.NoSanitizeFiles)
+    GenerateArg(Args, OPT_fsanitize_ignorelist_EQ, F, SA);
+
+  if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver3_8)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "3.8", SA);
+  else if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver4)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "4.0", SA);
+  else if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver6)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "6.0", SA);
+  else if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver7)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "7.0", SA);
+  else if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver9)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "9.0", SA);
+  else if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver11)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "11.0", SA);
+  else if (Opts.getClangABICompat() == LangOptions::ClangABI::Ver12)
+    GenerateArg(Args, OPT_fclang_abi_compat_EQ, "12.0", SA);
+
+  if (Opts.getSignReturnAddressScope() ==
+      LangOptions::SignReturnAddressScopeKind::All)
+    GenerateArg(Args, OPT_msign_return_address_EQ, "all", SA);
+  else if (Opts.getSignReturnAddressScope() ==
+           LangOptions::SignReturnAddressScopeKind::NonLeaf)
+    GenerateArg(Args, OPT_msign_return_address_EQ, "non-leaf", SA);
+
+  if (Opts.getSignReturnAddressKey() ==
+      LangOptions::SignReturnAddressKeyKind::BKey)
+    GenerateArg(Args, OPT_msign_return_address_key_EQ, "b_key", SA);
+
+  if (Opts.CXXABI)
+    GenerateArg(Args, OPT_fcxx_abi_EQ, TargetCXXABI::getSpelling(*Opts.CXXABI),
+                SA);
+
+  if (Opts.RelativeCXXABIVTables)
+    GenerateArg(Args, OPT_fexperimental_relative_cxx_abi_vtables, SA);
+  else
+    GenerateArg(Args, OPT_fno_experimental_relative_cxx_abi_vtables, SA);
+
+  for (const auto &MP : Opts.MacroPrefixMap)
+    GenerateArg(Args, OPT_fmacro_prefix_map_EQ, MP.first + "=" + MP.second, SA);
+}
+
+bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,
+                                       InputKind IK, const llvm::Triple &T,
+                                       std::vector<std::string> &Includes,
+                                       DiagnosticsEngine &Diags) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  if (IK.getFormat() == InputKind::Precompiled ||
+      IK.getLanguage() == Language::LLVM_IR) {
+    // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
+    // PassManager in BackendUtil.cpp. They need to be initialized no matter
+    // what the input type is.
+    if (Args.hasArg(OPT_fobjc_arc))
+      Opts.ObjCAutoRefCount = 1;
+    // PICLevel and PIELevel are needed during code generation and this should
+    // be set regardless of the input type.
+    Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
+    Opts.PIE = Args.hasArg(OPT_pic_is_pie);
+    parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
+                        Diags, Opts.Sanitize);
+
+    return Diags.getNumErrors() == NumErrorsBefore;
+  }
+
+  // Other LangOpts are only initialized when the input is not AST or LLVM IR.
+  // FIXME: Should we really be parsing this for an Language::Asm input?
+
+  // FIXME: Cleanup per-file based stuff.
+  LangStandard::Kind LangStd = LangStandard::lang_unspecified;
+  if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
+    LangStd = LangStandard::getLangKind(A->getValue());
+    if (LangStd == LangStandard::lang_unspecified) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << A->getValue();
+      // Report supported standards with short description.
+      for (unsigned KindValue = 0;
+           KindValue != LangStandard::lang_unspecified;
+           ++KindValue) {
+        const LangStandard &Std = LangStandard::getLangStandardForKind(
+          static_cast<LangStandard::Kind>(KindValue));
+        if (IsInputCompatibleWithStandard(IK, Std)) {
+          auto Diag = Diags.Report(diag::note_drv_use_standard);
+          Diag << Std.getName() << Std.getDescription();
+          unsigned NumAliases = 0;
+#define LANGSTANDARD(id, name, lang, desc, features)
+#define LANGSTANDARD_ALIAS(id, alias) \
+          if (KindValue == LangStandard::lang_##id) ++NumAliases;
+#define LANGSTANDARD_ALIAS_DEPR(id, alias)
+#include "clang/Basic/LangStandards.def"
+          Diag << NumAliases;
+#define LANGSTANDARD(id, name, lang, desc, features)
+#define LANGSTANDARD_ALIAS(id, alias) \
+          if (KindValue == LangStandard::lang_##id) Diag << alias;
+#define LANGSTANDARD_ALIAS_DEPR(id, alias)
+#include "clang/Basic/LangStandards.def"
+        }
+      }
+    } else {
+      // Valid standard, check to make sure language and standard are
+      // compatible.
+      const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
+      if (!IsInputCompatibleWithStandard(IK, Std)) {
+        Diags.Report(diag::err_drv_argument_not_allowed_with)
+          << A->getAsString(Args) << GetInputKindName(IK);
+      }
+    }
+  }
+
+  // -cl-std only applies for OpenCL language standards.
+  // Override the -std option in this case.
+  if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
+    LangStandard::Kind OpenCLLangStd
+      = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
+        .Cases("cl", "CL", LangStandard::lang_opencl10)
+        .Cases("cl1.0", "CL1.0", LangStandard::lang_opencl10)
+        .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
+        .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
+        .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
+        .Cases("cl3.0", "CL3.0", LangStandard::lang_opencl30)
+        .Cases("clc++", "CLC++", LangStandard::lang_openclcpp10)
+        .Cases("clc++1.0", "CLC++1.0", LangStandard::lang_openclcpp10)
+        .Cases("clc++2021", "CLC++2021", LangStandard::lang_openclcpp2021)
+        .Default(LangStandard::lang_unspecified);
+
+    if (OpenCLLangStd == LangStandard::lang_unspecified) {
+      Diags.Report(diag::err_drv_invalid_value)
+        << A->getAsString(Args) << A->getValue();
+    }
+    else
+      LangStd = OpenCLLangStd;
+  }
+
+  // These need to be parsed now. They are used to set OpenCL defaults.
+  Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
+  Opts.DeclareOpenCLBuiltins = Args.hasArg(OPT_fdeclare_opencl_builtins);
+
+  CompilerInvocation::setLangDefaults(Opts, IK, T, Includes, LangStd);
+
+  // The key paths of codegen options defined in Options.td start with
+  // "LangOpts->". Let's provide the expected variable name and type.
+  LangOptions *LangOpts = &Opts;
+
+#define LANG_OPTION_WITH_MARSHALLING(                                          \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef LANG_OPTION_WITH_MARSHALLING
+
+  if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
+    StringRef Name = A->getValue();
+    if (Name == "full" || Name == "branch") {
+      Opts.CFProtectionBranch = 1;
+    }
+  }
+
+  if ((Args.hasArg(OPT_fsycl_is_device) || Args.hasArg(OPT_fsycl_is_host)) &&
+      !Args.hasArg(OPT_sycl_std_EQ)) {
+    // If the user supplied -fsycl-is-device or -fsycl-is-host, but failed to
+    // provide -sycl-std=, we want to default it to whatever the default SYCL
+    // version is. I could not find a way to express this with the options
+    // tablegen because we still want this value to be SYCL_None when the user
+    // is not in device or host mode.
+    Opts.setSYCLVersion(LangOptions::SYCL_Default);
+  }
+
+  if (Opts.ObjC) {
+    if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
+      StringRef value = arg->getValue();
+      if (Opts.ObjCRuntime.tryParse(value))
+        Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
+    }
+
+    if (Args.hasArg(OPT_fobjc_gc_only))
+      Opts.setGC(LangOptions::GCOnly);
+    else if (Args.hasArg(OPT_fobjc_gc))
+      Opts.setGC(LangOptions::HybridGC);
+    else if (Args.hasArg(OPT_fobjc_arc)) {
+      Opts.ObjCAutoRefCount = 1;
+      if (!Opts.ObjCRuntime.allowsARC())
+        Diags.Report(diag::err_arc_unsupported_on_runtime);
+    }
+
+    // ObjCWeakRuntime tracks whether the runtime supports __weak, not
+    // whether the feature is actually enabled.  This is predominantly
+    // determined by -fobjc-runtime, but we allow it to be overridden
+    // from the command line for testing purposes.
+    if (Args.hasArg(OPT_fobjc_runtime_has_weak))
+      Opts.ObjCWeakRuntime = 1;
+    else
+      Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
+
+    // ObjCWeak determines whether __weak is actually enabled.
+    // Note that we allow -fno-objc-weak to disable this even in ARC mode.
+    if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
+      if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
+        assert(!Opts.ObjCWeak);
+      } else if (Opts.getGC() != LangOptions::NonGC) {
+        Diags.Report(diag::err_objc_weak_with_gc);
+      } else if (!Opts.ObjCWeakRuntime) {
+        Diags.Report(diag::err_objc_weak_unsupported);
+      } else {
+        Opts.ObjCWeak = 1;
+      }
+    } else if (Opts.ObjCAutoRefCount) {
+      Opts.ObjCWeak = Opts.ObjCWeakRuntime;
+    }
+
+    if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
+      Opts.ObjCSubscriptingLegacyRuntime =
+        (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fgnuc_version_EQ)) {
+    // Check that the version has 1 to 3 components and the minor and patch
+    // versions fit in two decimal digits.
+    VersionTuple GNUCVer;
+    bool Invalid = GNUCVer.tryParse(A->getValue());
+    unsigned Major = GNUCVer.getMajor();
+    unsigned Minor = GNUCVer.getMinor().getValueOr(0);
+    unsigned Patch = GNUCVer.getSubminor().getValueOr(0);
+    if (Invalid || GNUCVer.getBuild() || Minor >= 100 || Patch >= 100) {
+      Diags.Report(diag::err_drv_invalid_value)
+          << A->getAsString(Args) << A->getValue();
+    }
+    Opts.GNUCVersion = Major * 100 * 100 + Minor * 100 + Patch;
+  }
+
+  // In AIX OS, the -mignore-xcoff-visibility is enable by default if there is
+  // no -fvisibility=* option.
+  // This is the reason why '-fvisibility' needs to be always generated:
+  // its absence implies '-mignore-xcoff-visibility'.
+  //
+  // Suppose the original cc1 command line does contain '-fvisibility default':
+  // '-mignore-xcoff-visibility' should not be implied.
+  // * If '-fvisibility' is not generated (as most options with default values
+  //   don't), its absence would imply '-mignore-xcoff-visibility'. This changes
+  //   the command line semantics.
+  // * If '-fvisibility' is generated regardless of its presence and value,
+  //   '-mignore-xcoff-visibility' won't be implied and the command line
+  //   semantics are kept intact.
+  //
+  // When the original cc1 command line does **not** contain '-fvisibility',
+  // '-mignore-xcoff-visibility' is implied. The generated command line will
+  // contain both '-fvisibility default' and '-mignore-xcoff-visibility' and
+  // subsequent calls to `CreateFromArgs`/`generateCC1CommandLine` will always
+  // produce the same arguments.
+
+  if (T.isOSAIX() && (Args.hasArg(OPT_mignore_xcoff_visibility) ||
+                      !Args.hasArg(OPT_fvisibility)))
+    Opts.IgnoreXCOFFVisibility = 1;
+
+  if (Args.hasArg(OPT_ftrapv)) {
+    Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
+    // Set the handler, if one is specified.
+    Opts.OverflowHandler =
+        std::string(Args.getLastArgValue(OPT_ftrapv_handler));
+  }
+  else if (Args.hasArg(OPT_fwrapv))
+    Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
+
+  Opts.CaseInsensitive = Args.hasArg(OPT_fcase_insensitive_paths);
+
+  Opts.MSCompatibilityVersion = 0;
+  if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
+    VersionTuple VT;
+    if (VT.tryParse(A->getValue()))
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
+                                                << A->getValue();
+    Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
+                                  VT.getMinor().getValueOr(0) * 100000 +
+                                  VT.getSubminor().getValueOr(0);
+  }
+
+  // Mimicking gcc's behavior, trigraphs are only enabled if -trigraphs
+  // is specified, or -std is set to a conforming mode.
+  // Trigraphs are disabled by default in c++1z onwards.
+  // For z/OS, trigraphs are enabled by default (without regard to the above).
+  Opts.Trigraphs =
+      (!Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus17) || T.isOSzOS();
+  Opts.Trigraphs =
+      Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
+
+  Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
+    && Opts.OpenCLVersion == 200);
+
+  Opts.ConvergentFunctions = Opts.OpenCL || (Opts.CUDA && Opts.CUDAIsDevice) ||
+                             Opts.SYCLIsDevice ||
+                             Args.hasArg(OPT_fconvergent_functions);
+
+  Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
+  if (!Opts.NoBuiltin)
+    getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
+  Opts.LongDoubleSize = Args.hasArg(OPT_mlong_double_128)
+                            ? 128
+                            : Args.hasArg(OPT_mlong_double_64) ? 64 : 0;
+  if (Opts.FastRelaxedMath)
+    Opts.setDefaultFPContractMode(LangOptions::FPM_Fast);
+  llvm::sort(Opts.ModuleFeatures);
+
+  // -mrtd option
+  if (Arg *A = Args.getLastArg(OPT_mrtd)) {
+    if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
+      Diags.Report(diag::err_drv_argument_not_allowed_with)
+          << A->getSpelling() << "-fdefault-calling-conv";
+    else {
+      if (T.getArch() != llvm::Triple::x86)
+        Diags.Report(diag::err_drv_argument_not_allowed_with)
+            << A->getSpelling() << T.getTriple();
+      else
+        Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
+    }
+  }
+
+  // Check if -fopenmp is specified and set default version to 5.0.
+  Opts.OpenMP = Args.hasArg(OPT_fopenmp) ? 50 : 0;
+  // Check if -fopenmp-simd is specified.
+  bool IsSimdSpecified =
+      Args.hasFlag(options::OPT_fopenmp_simd, options::OPT_fno_openmp_simd,
+                   /*Default=*/false);
+  Opts.OpenMPSimd = !Opts.OpenMP && IsSimdSpecified;
+  Opts.OpenMPUseTLS =
+      Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
+  Opts.OpenMPIsDevice =
+      Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
+  Opts.OpenMPIRBuilder =
+      Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_enable_irbuilder);
+  bool IsTargetSpecified =
+      Opts.OpenMPIsDevice || Args.hasArg(options::OPT_fopenmp_targets_EQ);
+  Opts.OpenMPTargetNewRuntime =
+      Opts.OpenMPIsDevice &&
+      Args.hasArg(options::OPT_fopenmp_target_new_runtime);
+
+  Opts.ConvergentFunctions = Opts.ConvergentFunctions || Opts.OpenMPIsDevice;
+
+  if (Opts.OpenMP || Opts.OpenMPSimd) {
+    if (int Version = getLastArgIntValue(
+            Args, OPT_fopenmp_version_EQ,
+            (IsSimdSpecified || IsTargetSpecified) ? 50 : Opts.OpenMP, Diags))
+      Opts.OpenMP = Version;
+    // Provide diagnostic when a given target is not expected to be an OpenMP
+    // device or host.
+    if (!Opts.OpenMPIsDevice) {
+      switch (T.getArch()) {
+      default:
+        break;
+      // Add unsupported host targets here:
+      case llvm::Triple::nvptx:
+      case llvm::Triple::nvptx64:
+        Diags.Report(diag::err_drv_omp_host_target_not_supported) << T.str();
+        break;
+      }
+    }
+  }
+
+  // Set the flag to prevent the implementation from emitting device exception
+  // handling code for those requiring so.
+  if ((Opts.OpenMPIsDevice && (T.isNVPTX() || T.isAMDGCN())) ||
+      Opts.OpenCLCPlusPlus) {
+
+    Opts.Exceptions = 0;
+    Opts.CXXExceptions = 0;
+  }
+  if (Opts.OpenMPIsDevice && T.isNVPTX()) {
+    Opts.OpenMPCUDANumSMs =
+        getLastArgIntValue(Args, options::OPT_fopenmp_cuda_number_of_sm_EQ,
+                           Opts.OpenMPCUDANumSMs, Diags);
+    Opts.OpenMPCUDABlocksPerSM =
+        getLastArgIntValue(Args, options::OPT_fopenmp_cuda_blocks_per_sm_EQ,
+                           Opts.OpenMPCUDABlocksPerSM, Diags);
+    Opts.OpenMPCUDAReductionBufNum = getLastArgIntValue(
+        Args, options::OPT_fopenmp_cuda_teams_reduction_recs_num_EQ,
+        Opts.OpenMPCUDAReductionBufNum, Diags);
+  }
+
+  // Set the value of the debugging flag used in the new offloading device RTL.
+  // Set either by a specific value or to a default if not specified.
+  if (Opts.OpenMPIsDevice && (Args.hasArg(OPT_fopenmp_target_debug) ||
+                              Args.hasArg(OPT_fopenmp_target_debug_EQ))) {
+    if (Opts.OpenMPTargetNewRuntime) {
+      Opts.OpenMPTargetDebug = getLastArgIntValue(
+          Args, OPT_fopenmp_target_debug_EQ, Opts.OpenMPTargetDebug, Diags);
+      if (!Opts.OpenMPTargetDebug && Args.hasArg(OPT_fopenmp_target_debug))
+        Opts.OpenMPTargetDebug = 1;
+    } else {
+      Diags.Report(diag::err_drv_debug_no_new_runtime);
+    }
+  }
+
+  if (Opts.OpenMPIsDevice && Opts.OpenMPTargetNewRuntime) {
+    if (Args.hasArg(OPT_fopenmp_assume_teams_oversubscription))
+      Opts.OpenMPTeamSubscription = true;
+    if (Args.hasArg(OPT_fopenmp_assume_threads_oversubscription))
+      Opts.OpenMPThreadSubscription = true;
+  }
+
+  // Get the OpenMP target triples if any.
+  if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
+    enum ArchPtrSize { Arch16Bit, Arch32Bit, Arch64Bit };
+    auto getArchPtrSize = [](const llvm::Triple &T) {
+      if (T.isArch16Bit())
+        return Arch16Bit;
+      if (T.isArch32Bit())
+        return Arch32Bit;
+      assert(T.isArch64Bit() && "Expected 64-bit architecture");
+      return Arch64Bit;
+    };
+
+    for (unsigned i = 0; i < A->getNumValues(); ++i) {
+      llvm::Triple TT(A->getValue(i));
+
+      if (TT.getArch() == llvm::Triple::UnknownArch ||
+          !(TT.getArch() == llvm::Triple::aarch64 || TT.isPPC() ||
+            TT.getArch() == llvm::Triple::nvptx ||
+            TT.getArch() == llvm::Triple::nvptx64 ||
+            TT.getArch() == llvm::Triple::amdgcn ||
+            TT.getArch() == llvm::Triple::x86 ||
+            TT.getArch() == llvm::Triple::x86_64))
+        Diags.Report(diag::err_drv_invalid_omp_target) << A->getValue(i);
+      else if (getArchPtrSize(T) != getArchPtrSize(TT))
+        Diags.Report(diag::err_drv_incompatible_omp_arch)
+            << A->getValue(i) << T.str();
+      else
+        Opts.OMPTargetTriples.push_back(TT);
+    }
+  }
+
+  // Get OpenMP host file path if any and report if a non existent file is
+  // found
+  if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
+    Opts.OMPHostIRFile = A->getValue();
+    if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
+      Diags.Report(diag::err_drv_omp_host_ir_file_not_found)
+          << Opts.OMPHostIRFile;
+  }
+
+  // Set CUDA mode for OpenMP target NVPTX/AMDGCN if specified in options
+  Opts.OpenMPCUDAMode = Opts.OpenMPIsDevice && (T.isNVPTX() || T.isAMDGCN()) &&
+                        Args.hasArg(options::OPT_fopenmp_cuda_mode);
+
+  // Set CUDA mode for OpenMP target NVPTX/AMDGCN if specified in options
+  Opts.OpenMPCUDAForceFullRuntime =
+      Opts.OpenMPIsDevice && (T.isNVPTX() || T.isAMDGCN()) &&
+      Args.hasArg(options::OPT_fopenmp_cuda_force_full_runtime);
+
+  // FIXME: Eliminate this dependency.
+  unsigned Opt = getOptimizationLevel(Args, IK, Diags),
+       OptSize = getOptimizationLevelSize(Args);
+  Opts.Optimize = Opt != 0;
+  Opts.OptimizeSize = OptSize != 0;
+
+  // This is the __NO_INLINE__ define, which just depends on things like the
+  // optimization level and -fno-inline, not actually whether the backend has
+  // inlining enabled.
+  Opts.NoInlineDefine = !Opts.Optimize;
+  if (Arg *InlineArg = Args.getLastArg(
+          options::OPT_finline_functions, options::OPT_finline_hint_functions,
+          options::OPT_fno_inline_functions, options::OPT_fno_inline))
+    if (InlineArg->getOption().matches(options::OPT_fno_inline))
+      Opts.NoInlineDefine = true;
+
+  if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
+    StringRef Val = A->getValue();
+    if (Val == "fast")
+      Opts.setDefaultFPContractMode(LangOptions::FPM_Fast);
+    else if (Val == "on")
+      Opts.setDefaultFPContractMode(LangOptions::FPM_On);
+    else if (Val == "off")
+      Opts.setDefaultFPContractMode(LangOptions::FPM_Off);
+    else if (Val == "fast-honor-pragmas")
+      Opts.setDefaultFPContractMode(LangOptions::FPM_FastHonorPragmas);
+    else
+      Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
+  }
+
+  // Parse -fsanitize= arguments.
+  parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
+                      Diags, Opts.Sanitize);
+  Opts.NoSanitizeFiles = Args.getAllArgValues(OPT_fsanitize_ignorelist_EQ);
+  std::vector<std::string> systemIgnorelists =
+      Args.getAllArgValues(OPT_fsanitize_system_ignorelist_EQ);
+  Opts.NoSanitizeFiles.insert(Opts.NoSanitizeFiles.end(),
+                              systemIgnorelists.begin(),
+                              systemIgnorelists.end());
+
+  if (Arg *A = Args.getLastArg(OPT_fclang_abi_compat_EQ)) {
+    Opts.setClangABICompat(LangOptions::ClangABI::Latest);
+
+    StringRef Ver = A->getValue();
+    std::pair<StringRef, StringRef> VerParts = Ver.split('.');
+    unsigned Major, Minor = 0;
+
+    // Check the version number is valid: either 3.x (0 <= x <= 9) or
+    // y or y.0 (4 <= y <= current version).
+    if (!VerParts.first.startswith("0") &&
+        !VerParts.first.getAsInteger(10, Major) &&
+        3 <= Major && Major <= CLANG_VERSION_MAJOR &&
+        (Major == 3 ? VerParts.second.size() == 1 &&
+                      !VerParts.second.getAsInteger(10, Minor)
+                    : VerParts.first.size() == Ver.size() ||
+                      VerParts.second == "0")) {
+      // Got a valid version number.
+      if (Major == 3 && Minor <= 8)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver3_8);
+      else if (Major <= 4)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver4);
+      else if (Major <= 6)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver6);
+      else if (Major <= 7)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver7);
+      else if (Major <= 9)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver9);
+      else if (Major <= 11)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver11);
+      else if (Major <= 12)
+        Opts.setClangABICompat(LangOptions::ClangABI::Ver12);
+    } else if (Ver != "latest") {
+      Diags.Report(diag::err_drv_invalid_value)
+          << A->getAsString(Args) << A->getValue();
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(OPT_msign_return_address_EQ)) {
+    StringRef SignScope = A->getValue();
+
+    if (SignScope.equals_insensitive("none"))
+      Opts.setSignReturnAddressScope(
+          LangOptions::SignReturnAddressScopeKind::None);
+    else if (SignScope.equals_insensitive("all"))
+      Opts.setSignReturnAddressScope(
+          LangOptions::SignReturnAddressScopeKind::All);
+    else if (SignScope.equals_insensitive("non-leaf"))
+      Opts.setSignReturnAddressScope(
+          LangOptions::SignReturnAddressScopeKind::NonLeaf);
+    else
+      Diags.Report(diag::err_drv_invalid_value)
+          << A->getAsString(Args) << SignScope;
+
+    if (Arg *A = Args.getLastArg(OPT_msign_return_address_key_EQ)) {
+      StringRef SignKey = A->getValue();
+      if (!SignScope.empty() && !SignKey.empty()) {
+        if (SignKey.equals_insensitive("a_key"))
+          Opts.setSignReturnAddressKey(
+              LangOptions::SignReturnAddressKeyKind::AKey);
+        else if (SignKey.equals_insensitive("b_key"))
+          Opts.setSignReturnAddressKey(
+              LangOptions::SignReturnAddressKeyKind::BKey);
+        else
+          Diags.Report(diag::err_drv_invalid_value)
+              << A->getAsString(Args) << SignKey;
+      }
+    }
+  }
+
+  // The value can be empty, which indicates the system default should be used.
+  StringRef CXXABI = Args.getLastArgValue(OPT_fcxx_abi_EQ);
+  if (!CXXABI.empty()) {
+    if (!TargetCXXABI::isABI(CXXABI)) {
+      Diags.Report(diag::err_invalid_cxx_abi) << CXXABI;
+    } else {
+      auto Kind = TargetCXXABI::getKind(CXXABI);
+      if (!TargetCXXABI::isSupportedCXXABI(T, Kind))
+        Diags.Report(diag::err_unsupported_cxx_abi) << CXXABI << T.str();
+      else
+        Opts.CXXABI = Kind;
+    }
+  }
+
+  Opts.RelativeCXXABIVTables =
+      Args.hasFlag(options::OPT_fexperimental_relative_cxx_abi_vtables,
+                   options::OPT_fno_experimental_relative_cxx_abi_vtables,
+                   TargetCXXABI::usesRelativeVTables(T));
+
+  for (const auto &A : Args.getAllArgValues(OPT_fmacro_prefix_map_EQ)) {
+    auto Split = StringRef(A).split('=');
+    Opts.MacroPrefixMap.insert(
+        {std::string(Split.first), std::string(Split.second)});
+  }
+
+  // Error if -mvscale-min is unbounded.
+  if (Arg *A = Args.getLastArg(options::OPT_mvscale_min_EQ)) {
+    unsigned VScaleMin;
+    if (StringRef(A->getValue()).getAsInteger(10, VScaleMin) || VScaleMin == 0)
+      Diags.Report(diag::err_cc1_unbounded_vscale_min);
+  }
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static bool isStrictlyPreprocessorAction(frontend::ActionKind Action) {
+  switch (Action) {
+  case frontend::ASTDeclList:
+  case frontend::ASTDump:
+  case frontend::ASTPrint:
+  case frontend::ASTView:
+  case frontend::EmitAssembly:
+  case frontend::EmitBC:
+  case frontend::EmitHTML:
+  case frontend::EmitLLVM:
+  case frontend::EmitLLVMOnly:
+  case frontend::EmitCodeGenOnly:
+  case frontend::EmitObj:
+  case frontend::ExtractAPI:
+  case frontend::FixIt:
+  case frontend::GenerateModule:
+  case frontend::GenerateModuleInterface:
+  case frontend::GenerateHeaderModule:
+  case frontend::GeneratePCH:
+  case frontend::GenerateInterfaceStubs:
+  case frontend::ParseSyntaxOnly:
+  case frontend::ModuleFileInfo:
+  case frontend::VerifyPCH:
+  case frontend::PluginAction:
+  case frontend::RewriteObjC:
+  case frontend::RewriteTest:
+  case frontend::RunAnalysis:
+  case frontend::TemplightDump:
+  case frontend::MigrateSource:
+    return false;
+
+  case frontend::DumpCompilerOptions:
+  case frontend::DumpRawTokens:
+  case frontend::DumpTokens:
+  case frontend::InitOnly:
+  case frontend::PrintPreamble:
+  case frontend::PrintPreprocessedInput:
+  case frontend::RewriteMacros:
+  case frontend::RunPreprocessorOnly:
+  case frontend::PrintDependencyDirectivesSourceMinimizerOutput:
+    return true;
+  }
+  llvm_unreachable("invalid frontend action");
+}
+
+static void GeneratePreprocessorArgs(PreprocessorOptions &Opts,
+                                     SmallVectorImpl<const char *> &Args,
+                                     CompilerInvocation::StringAllocator SA,
+                                     const LangOptions &LangOpts,
+                                     const FrontendOptions &FrontendOpts,
+                                     const CodeGenOptions &CodeGenOpts) {
+  PreprocessorOptions *PreprocessorOpts = &Opts;
+
+#define PREPROCESSOR_OPTION_WITH_MARSHALLING(                                  \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef PREPROCESSOR_OPTION_WITH_MARSHALLING
+
+  if (Opts.PCHWithHdrStop && !Opts.PCHWithHdrStopCreate)
+    GenerateArg(Args, OPT_pch_through_hdrstop_use, SA);
+
+  for (const auto &D : Opts.DeserializedPCHDeclsToErrorOn)
+    GenerateArg(Args, OPT_error_on_deserialized_pch_decl, D, SA);
+
+  if (Opts.PrecompiledPreambleBytes != std::make_pair(0u, false))
+    GenerateArg(Args, OPT_preamble_bytes_EQ,
+                Twine(Opts.PrecompiledPreambleBytes.first) + "," +
+                    (Opts.PrecompiledPreambleBytes.second ? "1" : "0"),
+                SA);
+
+  for (const auto &M : Opts.Macros) {
+    // Don't generate __CET__ macro definitions. They are implied by the
+    // -fcf-protection option that is generated elsewhere.
+    if (M.first == "__CET__=1" && !M.second &&
+        !CodeGenOpts.CFProtectionReturn && CodeGenOpts.CFProtectionBranch)
+      continue;
+    if (M.first == "__CET__=2" && !M.second && CodeGenOpts.CFProtectionReturn &&
+        !CodeGenOpts.CFProtectionBranch)
+      continue;
+    if (M.first == "__CET__=3" && !M.second && CodeGenOpts.CFProtectionReturn &&
+        CodeGenOpts.CFProtectionBranch)
+      continue;
+
+    GenerateArg(Args, M.second ? OPT_U : OPT_D, M.first, SA);
+  }
+
+  for (const auto &I : Opts.Includes) {
+    // Don't generate OpenCL includes. They are implied by other flags that are
+    // generated elsewhere.
+    if (LangOpts.OpenCL && LangOpts.IncludeDefaultHeader &&
+        ((LangOpts.DeclareOpenCLBuiltins && I == "opencl-c-base.h") ||
+         I == "opencl-c.h"))
+      continue;
+
+    GenerateArg(Args, OPT_include, I, SA);
+  }
+
+  for (const auto &CI : Opts.ChainedIncludes)
+    GenerateArg(Args, OPT_chain_include, CI, SA);
+
+  for (const auto &RF : Opts.RemappedFiles)
+    GenerateArg(Args, OPT_remap_file, RF.first + ";" + RF.second, SA);
+
+  // Don't handle LexEditorPlaceholders. It is implied by the action that is
+  // generated elsewhere.
+}
+
+static bool ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
+                                  DiagnosticsEngine &Diags,
+                                  frontend::ActionKind Action,
+                                  const FrontendOptions &FrontendOpts) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  PreprocessorOptions *PreprocessorOpts = &Opts;
+
+#define PREPROCESSOR_OPTION_WITH_MARSHALLING(                                  \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef PREPROCESSOR_OPTION_WITH_MARSHALLING
+
+  Opts.PCHWithHdrStop = Args.hasArg(OPT_pch_through_hdrstop_create) ||
+                        Args.hasArg(OPT_pch_through_hdrstop_use);
+
+  for (const auto *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
+    Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
+
+  if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
+    StringRef Value(A->getValue());
+    size_t Comma = Value.find(',');
+    unsigned Bytes = 0;
+    unsigned EndOfLine = 0;
+
+    if (Comma == StringRef::npos ||
+        Value.substr(0, Comma).getAsInteger(10, Bytes) ||
+        Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
+      Diags.Report(diag::err_drv_preamble_format);
+    else {
+      Opts.PrecompiledPreambleBytes.first = Bytes;
+      Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
+    }
+  }
+
+  // Add the __CET__ macro if a CFProtection option is set.
+  if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
+    StringRef Name = A->getValue();
+    if (Name == "branch")
+      Opts.addMacroDef("__CET__=1");
+    else if (Name == "return")
+      Opts.addMacroDef("__CET__=2");
+    else if (Name == "full")
+      Opts.addMacroDef("__CET__=3");
+  }
+
+  // Add macros from the command line.
+  for (const auto *A : Args.filtered(OPT_D, OPT_U)) {
+    if (A->getOption().matches(OPT_D))
+      Opts.addMacroDef(A->getValue());
+    else
+      Opts.addMacroUndef(A->getValue());
+  }
+
+  // Add the ordered list of -includes.
+  for (const auto *A : Args.filtered(OPT_include))
+    Opts.Includes.emplace_back(A->getValue());
+
+  for (const auto *A : Args.filtered(OPT_chain_include))
+    Opts.ChainedIncludes.emplace_back(A->getValue());
+
+  for (const auto *A : Args.filtered(OPT_remap_file)) {
+    std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
+
+    if (Split.second.empty()) {
+      Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
+      continue;
+    }
+
+    Opts.addRemappedFile(Split.first, Split.second);
+  }
+
+  // Always avoid lexing editor placeholders when we're just running the
+  // preprocessor as we never want to emit the
+  // "editor placeholder in source file" error in PP only mode.
+  if (isStrictlyPreprocessorAction(Action))
+    Opts.LexEditorPlaceholders = false;
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static void GeneratePreprocessorOutputArgs(
+    const PreprocessorOutputOptions &Opts, SmallVectorImpl<const char *> &Args,
+    CompilerInvocation::StringAllocator SA, frontend::ActionKind Action) {
+  const PreprocessorOutputOptions &PreprocessorOutputOpts = Opts;
+
+#define PREPROCESSOR_OUTPUT_OPTION_WITH_MARSHALLING(                           \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef PREPROCESSOR_OUTPUT_OPTION_WITH_MARSHALLING
+
+  bool Generate_dM = isStrictlyPreprocessorAction(Action) && !Opts.ShowCPP;
+  if (Generate_dM)
+    GenerateArg(Args, OPT_dM, SA);
+  if (!Generate_dM && Opts.ShowMacros)
+    GenerateArg(Args, OPT_dD, SA);
+}
+
+static bool ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
+                                        ArgList &Args, DiagnosticsEngine &Diags,
+                                        frontend::ActionKind Action) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  PreprocessorOutputOptions &PreprocessorOutputOpts = Opts;
+
+#define PREPROCESSOR_OUTPUT_OPTION_WITH_MARSHALLING(                           \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef PREPROCESSOR_OUTPUT_OPTION_WITH_MARSHALLING
+
+  Opts.ShowCPP = isStrictlyPreprocessorAction(Action) && !Args.hasArg(OPT_dM);
+  Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+static void GenerateTargetArgs(const TargetOptions &Opts,
+                               SmallVectorImpl<const char *> &Args,
+                               CompilerInvocation::StringAllocator SA) {
+  const TargetOptions *TargetOpts = &Opts;
+#define TARGET_OPTION_WITH_MARSHALLING(                                        \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  GENERATE_OPTION_WITH_MARSHALLING(                                            \
+      Args, SA, KIND, FLAGS, SPELLING, ALWAYS_EMIT, KEYPATH, DEFAULT_VALUE,    \
+      IMPLIED_CHECK, IMPLIED_VALUE, DENORMALIZER, EXTRACTOR, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef TARGET_OPTION_WITH_MARSHALLING
+
+  if (!Opts.SDKVersion.empty())
+    GenerateArg(Args, OPT_target_sdk_version_EQ, Opts.SDKVersion.getAsString(),
+                SA);
+}
+
+static bool ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
+                            DiagnosticsEngine &Diags) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  TargetOptions *TargetOpts = &Opts;
+
+#define TARGET_OPTION_WITH_MARSHALLING(                                        \
+    PREFIX_TYPE, NAME, ID, KIND, GROUP, ALIAS, ALIASARGS, FLAGS, PARAM,        \
+    HELPTEXT, METAVAR, VALUES, SPELLING, SHOULD_PARSE, ALWAYS_EMIT, KEYPATH,   \
+    DEFAULT_VALUE, IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, DENORMALIZER,     \
+    MERGER, EXTRACTOR, TABLE_INDEX)                                            \
+  PARSE_OPTION_WITH_MARSHALLING(                                               \
+      Args, Diags, ID, FLAGS, PARAM, SHOULD_PARSE, KEYPATH, DEFAULT_VALUE,     \
+      IMPLIED_CHECK, IMPLIED_VALUE, NORMALIZER, MERGER, TABLE_INDEX)
+#include "clang/Driver/Options.inc"
+#undef TARGET_OPTION_WITH_MARSHALLING
+
+  if (Arg *A = Args.getLastArg(options::OPT_target_sdk_version_EQ)) {
+    llvm::VersionTuple Version;
+    if (Version.tryParse(A->getValue()))
+      Diags.Report(diag::err_drv_invalid_value)
+          << A->getAsString(Args) << A->getValue();
+    else
+      Opts.SDKVersion = Version;
+  }
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+bool CompilerInvocation::CreateFromArgsImpl(
+    CompilerInvocation &Res, ArrayRef<const char *> CommandLineArgs,
+    DiagnosticsEngine &Diags, const char *Argv0) {
+  unsigned NumErrorsBefore = Diags.getNumErrors();
+
+  // Parse the arguments.
+  const OptTable &Opts = getDriverOptTable();
+  const unsigned IncludedFlagsBitmask = options::CC1Option;
+  unsigned MissingArgIndex, MissingArgCount;
+  InputArgList Args = Opts.ParseArgs(CommandLineArgs, MissingArgIndex,
+                                     MissingArgCount, IncludedFlagsBitmask);
+  LangOptions &LangOpts = *Res.getLangOpts();
+
+  // Check for missing argument error.
+  if (MissingArgCount)
+    Diags.Report(diag::err_drv_missing_argument)
+        << Args.getArgString(MissingArgIndex) << MissingArgCount;
+
+  // Issue errors on unknown arguments.
+  for (const auto *A : Args.filtered(OPT_UNKNOWN)) {
+    auto ArgString = A->getAsString(Args);
+    std::string Nearest;
+    if (Opts.findNearest(ArgString, Nearest, IncludedFlagsBitmask) > 1)
+      Diags.Report(diag::err_drv_unknown_argument) << ArgString;
+    else
+      Diags.Report(diag::err_drv_unknown_argument_with_suggestion)
+          << ArgString << Nearest;
+  }
+
+  ParseFileSystemArgs(Res.getFileSystemOpts(), Args, Diags);
+  ParseMigratorArgs(Res.getMigratorOpts(), Args, Diags);
+  ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
+  ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
+                      /*DefaultDiagColor=*/false);
+  ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags, LangOpts.IsHeaderFile);
+  // FIXME: We shouldn't have to pass the DashX option around here
+  InputKind DashX = Res.getFrontendOpts().DashX;
+  ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
+  llvm::Triple T(Res.getTargetOpts().Triple);
+  ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args, Diags,
+                        Res.getFileSystemOpts().WorkingDir);
+
+  ParseLangArgs(LangOpts, Args, DashX, T, Res.getPreprocessorOpts().Includes,
+                Diags);
+  if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
+    LangOpts.ObjCExceptions = 1;
+
+  if (LangOpts.CUDA) {
+    // During CUDA device-side compilation, the aux triple is the
+    // triple used for host compilation.
+    if (LangOpts.CUDAIsDevice)
+      Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
+  }
+
+  // Set the triple of the host for OpenMP device compile.
+  if (LangOpts.OpenMPIsDevice)
+    Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
+
+  ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags, T,
+                   Res.getFrontendOpts().OutputFile, LangOpts);
+
+  // FIXME: Override value name discarding when asan or msan is used because the
+  // backend passes depend on the name of the alloca in order to print out
+  // names.
+  Res.getCodeGenOpts().DiscardValueNames &=
+      !LangOpts.Sanitize.has(SanitizerKind::Address) &&
+      !LangOpts.Sanitize.has(SanitizerKind::KernelAddress) &&
+      !LangOpts.Sanitize.has(SanitizerKind::Memory) &&
+      !LangOpts.Sanitize.has(SanitizerKind::KernelMemory);
+
+  ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, Diags,
+                        Res.getFrontendOpts().ProgramAction,
+                        Res.getFrontendOpts());
+  ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args, Diags,
+                              Res.getFrontendOpts().ProgramAction);
+
+  ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args, Diags,
+                            Res.getFrontendOpts().ProgramAction,
+                            Res.getPreprocessorOutputOpts().ShowLineMarkers);
+  if (!Res.getDependencyOutputOpts().OutputFile.empty() &&
+      Res.getDependencyOutputOpts().Targets.empty())
+    Diags.Report(diag::err_fe_dependency_file_requires_MT);
+
+  // If sanitizer is enabled, disable OPT_ffine_grained_bitfield_accesses.
+  if (Res.getCodeGenOpts().FineGrainedBitfieldAccesses &&
+      !Res.getLangOpts()->Sanitize.empty()) {
+    Res.getCodeGenOpts().FineGrainedBitfieldAccesses = false;
+    Diags.Report(diag::warn_drv_fine_grained_bitfield_accesses_ignored);
+  }
+
+  // Store the command-line for using in the CodeView backend.
+  Res.getCodeGenOpts().Argv0 = Argv0;
+  append_range(Res.getCodeGenOpts().CommandLineArgs, CommandLineArgs);
+
+  FixupInvocation(Res, Diags, Args, DashX);
+
+  return Diags.getNumErrors() == NumErrorsBefore;
+}
+
+bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Invocation,
+                                        ArrayRef<const char *> CommandLineArgs,
+                                        DiagnosticsEngine &Diags,
+                                        const char *Argv0) {
+  CompilerInvocation DummyInvocation;
+
+  return RoundTrip(
+      [](CompilerInvocation &Invocation, ArrayRef<const char *> CommandLineArgs,
+         DiagnosticsEngine &Diags, const char *Argv0) {
+        return CreateFromArgsImpl(Invocation, CommandLineArgs, Diags, Argv0);
+      },
+      [](CompilerInvocation &Invocation, SmallVectorImpl<const char *> &Args,
+         StringAllocator SA) { Invocation.generateCC1CommandLine(Args, SA); },
+      Invocation, DummyInvocation, CommandLineArgs, Diags, Argv0);
+}
+
+std::string CompilerInvocation::getModuleHash() const {
+  // FIXME: Consider using SHA1 instead of MD5.
+  llvm::HashBuilder<llvm::MD5, llvm::support::endianness::native> HBuilder;
+
+  // Note: For QoI reasons, the things we use as a hash here should all be
+  // dumped via the -module-info flag.
+
+  // Start the signature with the compiler version.
+  HBuilder.add(getClangFullRepositoryVersion());
+
+  // Also include the serialization version, in case LLVM_APPEND_VC_REV is off
+  // and getClangFullRepositoryVersion() doesn't include git revision.
+  HBuilder.add(serialization::VERSION_MAJOR, serialization::VERSION_MINOR);
+
+  // Extend the signature with the language options
+#define LANGOPT(Name, Bits, Default, Description) HBuilder.add(LangOpts->Name);
+#define ENUM_LANGOPT(Name, Type, Bits, Default, Description)                   \
+  HBuilder.add(static_cast<unsigned>(LangOpts->get##Name()));
+#define BENIGN_LANGOPT(Name, Bits, Default, Description)
+#define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
+#include "clang/Basic/LangOptions.def"
+
+  HBuilder.addRange(LangOpts->ModuleFeatures);
+
+  HBuilder.add(LangOpts->ObjCRuntime);
+  HBuilder.addRange(LangOpts->CommentOpts.BlockCommandNames);
+
+  // Extend the signature with the target options.
+  HBuilder.add(TargetOpts->Triple, TargetOpts->CPU, TargetOpts->TuneCPU,
+               TargetOpts->ABI);
+  HBuilder.addRange(TargetOpts->FeaturesAsWritten);
+
+  // Extend the signature with preprocessor options.
+  const PreprocessorOptions &ppOpts = getPreprocessorOpts();
+  HBuilder.add(ppOpts.UsePredefines, ppOpts.DetailedRecord);
+
+  const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
+  for (const auto &Macro : getPreprocessorOpts().Macros) {
+    // If we're supposed to ignore this macro for the purposes of modules,
+    // don't put it into the hash.
+    if (!hsOpts.ModulesIgnoreMacros.empty()) {
+      // Check whether we're ignoring this macro.
+      StringRef MacroDef = Macro.first;
+      if (hsOpts.ModulesIgnoreMacros.count(
+              llvm::CachedHashString(MacroDef.split('=').first)))
+        continue;
+    }
+
+    HBuilder.add(Macro);
+  }
+
+  // Extend the signature with the sysroot and other header search options.
+  HBuilder.add(hsOpts.Sysroot, hsOpts.ModuleFormat, hsOpts.UseDebugInfo,
+               hsOpts.UseBuiltinIncludes, hsOpts.UseStandardSystemIncludes,
+               hsOpts.UseStandardCXXIncludes, hsOpts.UseLibcxx,
+               hsOpts.ModulesValidateDiagnosticOptions);
+  HBuilder.add(hsOpts.ResourceDir);
+
+  if (hsOpts.ModulesStrictContextHash) {
+    HBuilder.addRange(hsOpts.SystemHeaderPrefixes);
+    HBuilder.addRange(hsOpts.UserEntries);
+
+    const DiagnosticOptions &diagOpts = getDiagnosticOpts();
+#define DIAGOPT(Name, Bits, Default) HBuilder.add(diagOpts.Name);
+#define ENUM_DIAGOPT(Name, Type, Bits, Default)                                \
+  HBuilder.add(diagOpts.get##Name());
+#include "clang/Basic/DiagnosticOptions.def"
+#undef DIAGOPT
+#undef ENUM_DIAGOPT
+  }
+
+  // Extend the signature with the user build path.
+  HBuilder.add(hsOpts.ModuleUserBuildPath);
+
+  // Extend the signature with the module file extensions.
+  for (const auto &ext : getFrontendOpts().ModuleFileExtensions)
+    ext->hashExtension(HBuilder);
+
+  // When compiling with -gmodules, also hash -fdebug-prefix-map as it
+  // affects the debug info in the PCM.
+  if (getCodeGenOpts().DebugTypeExtRefs)
+    HBuilder.addRange(getCodeGenOpts().DebugPrefixMap);
+
+  // Extend the signature with the enabled sanitizers, if at least one is
+  // enabled. Sanitizers which cannot affect AST generation aren't hashed.
+  SanitizerSet SanHash = LangOpts->Sanitize;
+  SanHash.clear(getPPTransparentSanitizers());
+  if (!SanHash.empty())
+    HBuilder.add(SanHash.Mask);
+
+  llvm::MD5::MD5Result Result;
+  HBuilder.getHasher().final(Result);
+  uint64_t Hash = Result.high() ^ Result.low();
+  return toString(llvm::APInt(64, Hash), 36, /*Signed=*/false);
+}
+
+void CompilerInvocation::generateCC1CommandLine(
+    SmallVectorImpl<const char *> &Args, StringAllocator SA) const {
+  llvm::Triple T(TargetOpts->Triple);
+
+  GenerateFileSystemArgs(FileSystemOpts, Args, SA);
+  GenerateMigratorArgs(MigratorOpts, Args, SA);
+  GenerateAnalyzerArgs(*AnalyzerOpts, Args, SA);
+  GenerateDiagnosticArgs(*DiagnosticOpts, Args, SA, false);
+  GenerateFrontendArgs(FrontendOpts, Args, SA, LangOpts->IsHeaderFile);
+  GenerateTargetArgs(*TargetOpts, Args, SA);
+  GenerateHeaderSearchArgs(*HeaderSearchOpts, Args, SA);
+  GenerateLangArgs(*LangOpts, Args, SA, T, FrontendOpts.DashX);
+  GenerateCodeGenArgs(CodeGenOpts, Args, SA, T, FrontendOpts.OutputFile,
+                      &*LangOpts);
+  GeneratePreprocessorArgs(*PreprocessorOpts, Args, SA, *LangOpts, FrontendOpts,
+                           CodeGenOpts);
+  GeneratePreprocessorOutputArgs(PreprocessorOutputOpts, Args, SA,
+                                 FrontendOpts.ProgramAction);
+  GenerateDependencyOutputArgs(DependencyOutputOpts, Args, SA);
+}
+
+IntrusiveRefCntPtr<llvm::vfs::FileSystem>
+clang::createVFSFromCompilerInvocationOrig(const CompilerInvocation &CI,
+                                       DiagnosticsEngine &Diags) {
+  return createVFSFromCompilerInvocation(CI, Diags,
+                                         llvm::vfs::getRealFileSystem());
+}
+
+IntrusiveRefCntPtr<llvm::vfs::FileSystem>
+clang::createVFSFromCompilerInvocation(
+    const CompilerInvocation &CI, DiagnosticsEngine &Diags,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> BaseFS) {
+  if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
+    return BaseFS;
+
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> Result = BaseFS;
+  // earlier vfs files are on the bottom
+  for (const auto &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
+    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
+        Result->getBufferForFile(File);
+    if (!Buffer) {
+      Diags.Report(diag::err_missing_vfs_overlay_file) << File;
+      continue;
+    }
+
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS = llvm::vfs::getVFSFromYAML(
+        std::move(Buffer.get()), /*DiagHandler*/ nullptr, File,
+        /*DiagContext*/ nullptr, Result);
+    if (!FS) {
+      Diags.Report(diag::err_invalid_vfs_overlay) << File;
+      continue;
+    }
+
+    Result = FS;
+  }
+  return Result;
+}
+
+IntrusiveRefCntPtr<llvm::vfs::FileSystem>
+clang::createVFSFromCompilerInvocation(const CompilerInvocation &CI,
+                                DiagnosticsEngine &Diags) {
+  IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS = clang::createVFSFromCompilerInvocationOrig(CI, Diags);
+  if (!CI.getHeaderSearchOpts().CaseInsensitive) {
+    return FS;
+  } else {
+    return new llvm::vfs::CaseInsensitiveFileSystem(FS);
+  }
+}
diff --git a/contrib/libs/clang14/lib/Frontend/CreateInvocationFromCommandLine.cpp b/contrib/libs/clang14/lib/Frontend/CreateInvocationFromCommandLine.cpp
new file mode 100644
index 0000000000..c5627d13a7
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/CreateInvocationFromCommandLine.cpp
@@ -0,0 +1,108 @@
+//===--- CreateInvocationFromCommandLine.cpp - CompilerInvocation from Args ==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Construct a compiler invocation object for command line driver arguments
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Driver/Action.h"
+#include "clang/Driver/Compilation.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Options.h"
+#include "clang/Driver/Tool.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/Utils.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Support/Host.h"
+using namespace clang;
+using namespace llvm::opt;
+
+std::unique_ptr<CompilerInvocation> clang::createInvocationFromCommandLine(
+    ArrayRef<const char *> ArgList, IntrusiveRefCntPtr<DiagnosticsEngine> Diags,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS, bool ShouldRecoverOnErorrs,
+    std::vector<std::string> *CC1Args) {
+  assert(!ArgList.empty());
+  if (!Diags.get()) {
+    // No diagnostics engine was provided, so create our own diagnostics object
+    // with the default options.
+    Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions);
+  }
+
+  SmallVector<const char *, 16> Args(ArgList.begin(), ArgList.end());
+
+  // FIXME: Find a cleaner way to force the driver into restricted modes.
+  Args.insert(
+      llvm::find_if(
+          Args, [](const char *Elem) { return llvm::StringRef(Elem) == "--"; }),
+      "-fsyntax-only");
+
+  // FIXME: We shouldn't have to pass in the path info.
+  driver::Driver TheDriver(Args[0], llvm::sys::getDefaultTargetTriple(), *Diags,
+                           "clang LLVM compiler", VFS);
+
+  // Don't check that inputs exist, they may have been remapped.
+  TheDriver.setCheckInputsExist(false);
+
+  std::unique_ptr<driver::Compilation> C(TheDriver.BuildCompilation(Args));
+  if (!C)
+    return nullptr;
+
+  // Just print the cc1 options if -### was present.
+  if (C->getArgs().hasArg(driver::options::OPT__HASH_HASH_HASH)) {
+    C->getJobs().Print(llvm::errs(), "\n", true);
+    return nullptr;
+  }
+
+  // We expect to get back exactly one command job, if we didn't something
+  // failed. Offload compilation is an exception as it creates multiple jobs. If
+  // that's the case, we proceed with the first job. If caller needs a
+  // particular job, it should be controlled via options (e.g.
+  // --cuda-{host|device}-only for CUDA) passed to the driver.
+  const driver::JobList &Jobs = C->getJobs();
+  bool OffloadCompilation = false;
+  if (Jobs.size() > 1) {
+    for (auto &A : C->getActions()){
+      // On MacOSX real actions may end up being wrapped in BindArchAction
+      if (isa<driver::BindArchAction>(A))
+        A = *A->input_begin();
+      if (isa<driver::OffloadAction>(A)) {
+        OffloadCompilation = true;
+        break;
+      }
+    }
+  }
+
+  bool PickFirstOfMany = OffloadCompilation || ShouldRecoverOnErorrs;
+  if (Jobs.size() == 0 || (Jobs.size() > 1 && !PickFirstOfMany)) {
+    SmallString<256> Msg;
+    llvm::raw_svector_ostream OS(Msg);
+    Jobs.Print(OS, "; ", true);
+    Diags->Report(diag::err_fe_expected_compiler_job) << OS.str();
+    return nullptr;
+  }
+  auto Cmd = llvm::find_if(Jobs, [](const driver::Command &Cmd) {
+    return StringRef(Cmd.getCreator().getName()) == "clang";
+  });
+  if (Cmd == Jobs.end()) {
+    Diags->Report(diag::err_fe_expected_clang_command);
+    return nullptr;
+  }
+
+  const ArgStringList &CCArgs = Cmd->getArguments();
+  if (CC1Args)
+    *CC1Args = {CCArgs.begin(), CCArgs.end()};
+  auto CI = std::make_unique<CompilerInvocation>();
+  if (!CompilerInvocation::CreateFromArgs(*CI, CCArgs, *Diags, Args[0]) &&
+      !ShouldRecoverOnErorrs)
+    return nullptr;
+  return CI;
+}
diff --git a/contrib/libs/clang14/lib/Frontend/DependencyFile.cpp b/contrib/libs/clang14/lib/Frontend/DependencyFile.cpp
new file mode 100644
index 0000000000..2888273741
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/DependencyFile.cpp
@@ -0,0 +1,385 @@
+//===--- DependencyFile.cpp - Generate dependency file --------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This code generates dependency files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/Utils.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/DependencyOutputOptions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Lex/DirectoryLookup.h"
+#include "clang/Lex/ModuleMap.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Serialization/ASTReader.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+
+namespace {
+struct DepCollectorPPCallbacks : public PPCallbacks {
+  DependencyCollector &DepCollector;
+  SourceManager &SM;
+  DiagnosticsEngine &Diags;
+  DepCollectorPPCallbacks(DependencyCollector &L, SourceManager &SM,
+                          DiagnosticsEngine &Diags)
+      : DepCollector(L), SM(SM), Diags(Diags) {}
+
+  void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                   SrcMgr::CharacteristicKind FileType,
+                   FileID PrevFID) override {
+    if (Reason != PPCallbacks::EnterFile)
+      return;
+
+    // Dependency generation really does want to go all the way to the
+    // file entry for a source location to find out what is depended on.
+    // We do not want #line markers to affect dependency generation!
+    if (Optional<StringRef> Filename = SM.getNonBuiltinFilenameForID(
+            SM.getFileID(SM.getExpansionLoc(Loc))))
+      DepCollector.maybeAddDependency(
+          llvm::sys::path::remove_leading_dotslash(*Filename),
+          /*FromModule*/ false, isSystem(FileType), /*IsModuleFile*/ false,
+          /*IsMissing*/ false);
+  }
+
+  void FileSkipped(const FileEntryRef &SkippedFile, const Token &FilenameTok,
+                   SrcMgr::CharacteristicKind FileType) override {
+    StringRef Filename =
+        llvm::sys::path::remove_leading_dotslash(SkippedFile.getName());
+    DepCollector.maybeAddDependency(Filename, /*FromModule=*/false,
+                                    /*IsSystem=*/isSystem(FileType),
+                                    /*IsModuleFile=*/false,
+                                    /*IsMissing=*/false);
+  }
+
+  void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
+                          StringRef FileName, bool IsAngled,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          StringRef SearchPath, StringRef RelativePath,
+                          const Module *Imported,
+                          SrcMgr::CharacteristicKind FileType) override {
+    if (!File)
+      DepCollector.maybeAddDependency(FileName, /*FromModule*/false,
+                                     /*IsSystem*/false, /*IsModuleFile*/false,
+                                     /*IsMissing*/true);
+    // Files that actually exist are handled by FileChanged.
+  }
+
+  void HasInclude(SourceLocation Loc, StringRef SpelledFilename, bool IsAngled,
+                  Optional<FileEntryRef> File,
+                  SrcMgr::CharacteristicKind FileType) override {
+    if (!File)
+      return;
+    StringRef Filename =
+        llvm::sys::path::remove_leading_dotslash(File->getName());
+    DepCollector.maybeAddDependency(Filename, /*FromModule=*/false,
+                                    /*IsSystem=*/isSystem(FileType),
+                                    /*IsModuleFile=*/false,
+                                    /*IsMissing=*/false);
+  }
+
+  void EndOfMainFile() override { DepCollector.finishedMainFile(Diags); }
+};
+
+struct DepCollectorMMCallbacks : public ModuleMapCallbacks {
+  DependencyCollector &DepCollector;
+  DepCollectorMMCallbacks(DependencyCollector &DC) : DepCollector(DC) {}
+
+  void moduleMapFileRead(SourceLocation Loc, const FileEntry &Entry,
+                         bool IsSystem) override {
+    StringRef Filename = Entry.getName();
+    DepCollector.maybeAddDependency(Filename, /*FromModule*/false,
+                                    /*IsSystem*/IsSystem,
+                                    /*IsModuleFile*/false,
+                                    /*IsMissing*/false);
+  }
+};
+
+struct DepCollectorASTListener : public ASTReaderListener {
+  DependencyCollector &DepCollector;
+  DepCollectorASTListener(DependencyCollector &L) : DepCollector(L) { }
+  bool needsInputFileVisitation() override { return true; }
+  bool needsSystemInputFileVisitation() override {
+    return DepCollector.needSystemDependencies();
+  }
+  void visitModuleFile(StringRef Filename,
+                       serialization::ModuleKind Kind) override {
+    DepCollector.maybeAddDependency(Filename, /*FromModule*/true,
+                                   /*IsSystem*/false, /*IsModuleFile*/true,
+                                   /*IsMissing*/false);
+  }
+  bool visitInputFile(StringRef Filename, bool IsSystem,
+                      bool IsOverridden, bool IsExplicitModule) override {
+    if (IsOverridden || IsExplicitModule)
+      return true;
+
+    DepCollector.maybeAddDependency(Filename, /*FromModule*/true, IsSystem,
+                                   /*IsModuleFile*/false, /*IsMissing*/false);
+    return true;
+  }
+};
+} // end anonymous namespace
+
+void DependencyCollector::maybeAddDependency(StringRef Filename,
+                                             bool FromModule, bool IsSystem,
+                                             bool IsModuleFile,
+                                             bool IsMissing) {
+  if (sawDependency(Filename, FromModule, IsSystem, IsModuleFile, IsMissing))
+    addDependency(Filename);
+}
+
+bool DependencyCollector::addDependency(StringRef Filename) {
+  StringRef SearchPath;
+#ifdef _WIN32
+  // Make the search insensitive to case and separators.
+  llvm::SmallString<256> TmpPath = Filename;
+  llvm::sys::path::native(TmpPath);
+  std::transform(TmpPath.begin(), TmpPath.end(), TmpPath.begin(), ::tolower);
+  SearchPath = TmpPath.str();
+#else
+  SearchPath = Filename;
+#endif
+
+  if (Seen.insert(SearchPath).second) {
+    Dependencies.push_back(std::string(Filename));
+    return true;
+  }
+  return false;
+}
+
+static bool isSpecialFilename(StringRef Filename) {
+  return llvm::StringSwitch<bool>(Filename)
+      .Case("<built-in>", true)
+      .Case("<stdin>", true)
+      .Default(false);
+}
+
+bool DependencyCollector::sawDependency(StringRef Filename, bool FromModule,
+                                        bool IsSystem, bool IsModuleFile,
+                                        bool IsMissing) {
+  return !isSpecialFilename(Filename) &&
+         (needSystemDependencies() || !IsSystem);
+}
+
+DependencyCollector::~DependencyCollector() { }
+void DependencyCollector::attachToPreprocessor(Preprocessor &PP) {
+  PP.addPPCallbacks(std::make_unique<DepCollectorPPCallbacks>(
+      *this, PP.getSourceManager(), PP.getDiagnostics()));
+  PP.getHeaderSearchInfo().getModuleMap().addModuleMapCallbacks(
+      std::make_unique<DepCollectorMMCallbacks>(*this));
+}
+void DependencyCollector::attachToASTReader(ASTReader &R) {
+  R.addListener(std::make_unique<DepCollectorASTListener>(*this));
+}
+
+DependencyFileGenerator::DependencyFileGenerator(
+    const DependencyOutputOptions &Opts)
+    : OutputFile(Opts.OutputFile), Targets(Opts.Targets),
+      IncludeSystemHeaders(Opts.IncludeSystemHeaders),
+      PhonyTarget(Opts.UsePhonyTargets),
+      AddMissingHeaderDeps(Opts.AddMissingHeaderDeps), SeenMissingHeader(false),
+      IncludeModuleFiles(Opts.IncludeModuleFiles),
+      OutputFormat(Opts.OutputFormat), InputFileIndex(0) {
+  for (const auto &ExtraDep : Opts.ExtraDeps) {
+    if (addDependency(ExtraDep.first))
+      ++InputFileIndex;
+  }
+}
+
+void DependencyFileGenerator::attachToPreprocessor(Preprocessor &PP) {
+  // Disable the "file not found" diagnostic if the -MG option was given.
+  if (AddMissingHeaderDeps)
+    PP.SetSuppressIncludeNotFoundError(true);
+
+  DependencyCollector::attachToPreprocessor(PP);
+}
+
+bool DependencyFileGenerator::sawDependency(StringRef Filename, bool FromModule,
+                                            bool IsSystem, bool IsModuleFile,
+                                            bool IsMissing) {
+  if (IsMissing) {
+    // Handle the case of missing file from an inclusion directive.
+    if (AddMissingHeaderDeps)
+      return true;
+    SeenMissingHeader = true;
+    return false;
+  }
+  if (IsModuleFile && !IncludeModuleFiles)
+    return false;
+
+  if (isSpecialFilename(Filename))
+    return false;
+
+  if (IncludeSystemHeaders)
+    return true;
+
+  return !IsSystem;
+}
+
+void DependencyFileGenerator::finishedMainFile(DiagnosticsEngine &Diags) {
+  outputDependencyFile(Diags);
+}
+
+/// Print the filename, with escaping or quoting that accommodates the three
+/// most likely tools that use dependency files: GNU Make, BSD Make, and
+/// NMake/Jom.
+///
+/// BSD Make is the simplest case: It does no escaping at all.  This means
+/// characters that are normally delimiters, i.e. space and # (the comment
+/// character) simply aren't supported in filenames.
+///
+/// GNU Make does allow space and # in filenames, but to avoid being treated
+/// as a delimiter or comment, these must be escaped with a backslash. Because
+/// backslash is itself the escape character, if a backslash appears in a
+/// filename, it should be escaped as well.  (As a special case, $ is escaped
+/// as $$, which is the normal Make way to handle the $ character.)
+/// For compatibility with BSD Make and historical practice, if GNU Make
+/// un-escapes characters in a filename but doesn't find a match, it will
+/// retry with the unmodified original string.
+///
+/// GCC tries to accommodate both Make formats by escaping any space or #
+/// characters in the original filename, but not escaping backslashes.  The
+/// apparent intent is so that filenames with backslashes will be handled
+/// correctly by BSD Make, and by GNU Make in its fallback mode of using the
+/// unmodified original string; filenames with # or space characters aren't
+/// supported by BSD Make at all, but will be handled correctly by GNU Make
+/// due to the escaping.
+///
+/// A corner case that GCC gets only partly right is when the original filename
+/// has a backslash immediately followed by space or #.  GNU Make would expect
+/// this backslash to be escaped; however GCC escapes the original backslash
+/// only when followed by space, not #.  It will therefore take a dependency
+/// from a directive such as
+///     #include "a\ b\#c.h"
+/// and emit it as
+///     a\\\ b\\#c.h
+/// which GNU Make will interpret as
+///     a\ b\
+/// followed by a comment. Failing to find this file, it will fall back to the
+/// original string, which probably doesn't exist either; in any case it won't
+/// find
+///     a\ b\#c.h
+/// which is the actual filename specified by the include directive.
+///
+/// Clang does what GCC does, rather than what GNU Make expects.
+///
+/// NMake/Jom has a different set of scary characters, but wraps filespecs in
+/// double-quotes to avoid misinterpreting them; see
+/// https://msdn.microsoft.com/en-us/library/dd9y37ha.aspx for NMake info,
+/// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
+/// for Windows file-naming info.
+static void PrintFilename(raw_ostream &OS, StringRef Filename,
+                          DependencyOutputFormat OutputFormat) {
+  // Convert filename to platform native path
+  llvm::SmallString<256> NativePath;
+  llvm::sys::path::native(Filename.str(), NativePath);
+
+  if (OutputFormat == DependencyOutputFormat::NMake) {
+    // Add quotes if needed. These are the characters listed as "special" to
+    // NMake, that are legal in a Windows filespec, and that could cause
+    // misinterpretation of the dependency string.
+    if (NativePath.find_first_of(" #${}^!") != StringRef::npos)
+      OS << '\"' << NativePath << '\"';
+    else
+      OS << NativePath;
+    return;
+  }
+  assert(OutputFormat == DependencyOutputFormat::Make);
+  for (unsigned i = 0, e = NativePath.size(); i != e; ++i) {
+    if (NativePath[i] == '#') // Handle '#' the broken gcc way.
+      OS << '\\';
+    else if (NativePath[i] == ' ') { // Handle space correctly.
+      OS << '\\';
+      unsigned j = i;
+      while (j > 0 && NativePath[--j] == '\\')
+        OS << '\\';
+    } else if (NativePath[i] == '$') // $ is escaped by $$.
+      OS << '$';
+    OS << NativePath[i];
+  }
+}
+
+void DependencyFileGenerator::outputDependencyFile(DiagnosticsEngine &Diags) {
+  if (SeenMissingHeader) {
+    llvm::sys::fs::remove(OutputFile);
+    return;
+  }
+
+  std::error_code EC;
+  llvm::raw_fd_ostream OS(OutputFile, EC, llvm::sys::fs::OF_TextWithCRLF);
+  if (EC) {
+    Diags.Report(diag::err_fe_error_opening) << OutputFile << EC.message();
+    return;
+  }
+
+  outputDependencyFile(OS);
+}
+
+void DependencyFileGenerator::outputDependencyFile(llvm::raw_ostream &OS) {
+  // Write out the dependency targets, trying to avoid overly long
+  // lines when possible. We try our best to emit exactly the same
+  // dependency file as GCC (4.2), assuming the included files are the
+  // same.
+  const unsigned MaxColumns = 75;
+  unsigned Columns = 0;
+
+  for (StringRef Target : Targets) {
+    unsigned N = Target.size();
+    if (Columns == 0) {
+      Columns += N;
+    } else if (Columns + N + 2 > MaxColumns) {
+      Columns = N + 2;
+      OS << " \\\n  ";
+    } else {
+      Columns += N + 1;
+      OS << ' ';
+    }
+    // Targets already quoted as needed.
+    OS << Target;
+  }
+
+  OS << ':';
+  Columns += 1;
+
+  // Now add each dependency in the order it was seen, but avoiding
+  // duplicates.
+  ArrayRef<std::string> Files = getDependencies();
+  for (StringRef File : Files) {
+    // Start a new line if this would exceed the column limit. Make
+    // sure to leave space for a trailing " \" in case we need to
+    // break the line on the next iteration.
+    unsigned N = File.size();
+    if (Columns + (N + 1) + 2 > MaxColumns) {
+      OS << " \\\n ";
+      Columns = 2;
+    }
+    OS << ' ';
+    PrintFilename(OS, File, OutputFormat);
+    Columns += N + 1;
+  }
+  OS << '\n';
+
+  // Create phony targets if requested.
+  if (PhonyTarget && !Files.empty()) {
+    unsigned Index = 0;
+    for (auto I = Files.begin(), E = Files.end(); I != E; ++I) {
+      if (Index++ == InputFileIndex)
+        continue;
+      OS << '\n';
+      PrintFilename(OS, *I, OutputFormat);
+      OS << ":\n";
+    }
+  }
+}
diff --git a/contrib/libs/clang14/lib/Frontend/DependencyGraph.cpp b/contrib/libs/clang14/lib/Frontend/DependencyGraph.cpp
new file mode 100644
index 0000000000..4bed4e2d44
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/DependencyGraph.cpp
@@ -0,0 +1,139 @@
+//===--- DependencyGraph.cpp - Generate dependency file -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This code generates a header dependency graph in DOT format, for use
+// with, e.g., GraphViz.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/Utils.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/Support/GraphWriter.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+namespace DOT = llvm::DOT;
+
+namespace {
+class DependencyGraphCallback : public PPCallbacks {
+  const Preprocessor *PP;
+  std::string OutputFile;
+  std::string SysRoot;
+  llvm::SetVector<const FileEntry *> AllFiles;
+  typedef llvm::DenseMap<const FileEntry *,
+                         SmallVector<const FileEntry *, 2> > DependencyMap;
+
+  DependencyMap Dependencies;
+
+private:
+  raw_ostream &writeNodeReference(raw_ostream &OS,
+                                  const FileEntry *Node);
+  void OutputGraphFile();
+
+public:
+  DependencyGraphCallback(const Preprocessor *_PP, StringRef OutputFile,
+                          StringRef SysRoot)
+    : PP(_PP), OutputFile(OutputFile.str()), SysRoot(SysRoot.str()) { }
+
+  void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
+                          StringRef FileName, bool IsAngled,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          StringRef SearchPath, StringRef RelativePath,
+                          const Module *Imported,
+                          SrcMgr::CharacteristicKind FileType) override;
+
+  void EndOfMainFile() override {
+    OutputGraphFile();
+  }
+
+};
+}
+
+void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
+                                     StringRef SysRoot) {
+  PP.addPPCallbacks(std::make_unique<DependencyGraphCallback>(&PP, OutputFile,
+                                                               SysRoot));
+}
+
+void DependencyGraphCallback::InclusionDirective(
+    SourceLocation HashLoc,
+    const Token &IncludeTok,
+    StringRef FileName,
+    bool IsAngled,
+    CharSourceRange FilenameRange,
+    const FileEntry *File,
+    StringRef SearchPath,
+    StringRef RelativePath,
+    const Module *Imported,
+    SrcMgr::CharacteristicKind FileType) {
+  if (!File)
+    return;
+
+  SourceManager &SM = PP->getSourceManager();
+  const FileEntry *FromFile
+    = SM.getFileEntryForID(SM.getFileID(SM.getExpansionLoc(HashLoc)));
+  if (!FromFile)
+    return;
+
+  Dependencies[FromFile].push_back(File);
+
+  AllFiles.insert(File);
+  AllFiles.insert(FromFile);
+}
+
+raw_ostream &
+DependencyGraphCallback::writeNodeReference(raw_ostream &OS,
+                                            const FileEntry *Node) {
+  OS << "header_" << Node->getUID();
+  return OS;
+}
+
+void DependencyGraphCallback::OutputGraphFile() {
+  std::error_code EC;
+  llvm::raw_fd_ostream OS(OutputFile, EC, llvm::sys::fs::OF_TextWithCRLF);
+  if (EC) {
+    PP->getDiagnostics().Report(diag::err_fe_error_opening) << OutputFile
+                                                            << EC.message();
+    return;
+  }
+
+  OS << "digraph \"dependencies\" {\n";
+
+  // Write the nodes
+  for (unsigned I = 0, N = AllFiles.size(); I != N; ++I) {
+    // Write the node itself.
+    OS.indent(2);
+    writeNodeReference(OS, AllFiles[I]);
+    OS << " [ shape=\"box\", label=\"";
+    StringRef FileName = AllFiles[I]->getName();
+    if (FileName.startswith(SysRoot))
+      FileName = FileName.substr(SysRoot.size());
+
+    OS << DOT::EscapeString(std::string(FileName)) << "\"];\n";
+  }
+
+  // Write the edges
+  for (DependencyMap::iterator F = Dependencies.begin(),
+                            FEnd = Dependencies.end();
+       F != FEnd; ++F) {
+    for (unsigned I = 0, N = F->second.size(); I != N; ++I) {
+      OS.indent(2);
+      writeNodeReference(OS, F->first);
+      OS << " -> ";
+      writeNodeReference(OS, F->second[I]);
+      OS << ";\n";
+    }
+  }
+  OS << "}\n";
+}
+
diff --git a/contrib/libs/clang14/lib/Frontend/DiagnosticRenderer.cpp b/contrib/libs/clang14/lib/Frontend/DiagnosticRenderer.cpp
new file mode 100644
index 0000000000..0afc8f3b1d
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/DiagnosticRenderer.cpp
@@ -0,0 +1,635 @@
+//===- DiagnosticRenderer.cpp - Diagnostic Pretty-Printing ----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/DiagnosticRenderer.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Edit/Commit.h"
+#include "clang/Edit/EditedSource.h"
+#include "clang/Edit/EditsReceiver.h"
+#include "clang/Lex/Lexer.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <iterator>
+#include <utility>
+
+using namespace clang;
+
+DiagnosticRenderer::DiagnosticRenderer(const LangOptions &LangOpts,
+                                       DiagnosticOptions *DiagOpts)
+    : LangOpts(LangOpts), DiagOpts(DiagOpts), LastLevel() {}
+
+DiagnosticRenderer::~DiagnosticRenderer() = default;
+
+namespace {
+
+class FixitReceiver : public edit::EditsReceiver {
+  SmallVectorImpl<FixItHint> &MergedFixits;
+
+public:
+  FixitReceiver(SmallVectorImpl<FixItHint> &MergedFixits)
+      : MergedFixits(MergedFixits) {}
+
+  void insert(SourceLocation loc, StringRef text) override {
+    MergedFixits.push_back(FixItHint::CreateInsertion(loc, text));
+  }
+
+  void replace(CharSourceRange range, StringRef text) override {
+    MergedFixits.push_back(FixItHint::CreateReplacement(range, text));
+  }
+};
+
+} // namespace
+
+static void mergeFixits(ArrayRef<FixItHint> FixItHints,
+                        const SourceManager &SM, const LangOptions &LangOpts,
+                        SmallVectorImpl<FixItHint> &MergedFixits) {
+  edit::Commit commit(SM, LangOpts);
+  for (const auto &Hint : FixItHints)
+    if (Hint.CodeToInsert.empty()) {
+      if (Hint.InsertFromRange.isValid())
+        commit.insertFromRange(Hint.RemoveRange.getBegin(),
+                           Hint.InsertFromRange, /*afterToken=*/false,
+                           Hint.BeforePreviousInsertions);
+      else
+        commit.remove(Hint.RemoveRange);
+    } else {
+      if (Hint.RemoveRange.isTokenRange() ||
+          Hint.RemoveRange.getBegin() != Hint.RemoveRange.getEnd())
+        commit.replace(Hint.RemoveRange, Hint.CodeToInsert);
+      else
+        commit.insert(Hint.RemoveRange.getBegin(), Hint.CodeToInsert,
+                    /*afterToken=*/false, Hint.BeforePreviousInsertions);
+    }
+
+  edit::EditedSource Editor(SM, LangOpts);
+  if (Editor.commit(commit)) {
+    FixitReceiver Rec(MergedFixits);
+    Editor.applyRewrites(Rec);
+  }
+}
+
+void DiagnosticRenderer::emitDiagnostic(FullSourceLoc Loc,
+                                        DiagnosticsEngine::Level Level,
+                                        StringRef Message,
+                                        ArrayRef<CharSourceRange> Ranges,
+                                        ArrayRef<FixItHint> FixItHints,
+                                        DiagOrStoredDiag D) {
+  assert(Loc.hasManager() || Loc.isInvalid());
+
+  beginDiagnostic(D, Level);
+
+  if (!Loc.isValid())
+    // If we have no source location, just emit the diagnostic message.
+    emitDiagnosticMessage(Loc, PresumedLoc(), Level, Message, Ranges, D);
+  else {
+    // Get the ranges into a local array we can hack on.
+    SmallVector<CharSourceRange, 20> MutableRanges(Ranges.begin(),
+                                                   Ranges.end());
+
+    SmallVector<FixItHint, 8> MergedFixits;
+    if (!FixItHints.empty()) {
+      mergeFixits(FixItHints, Loc.getManager(), LangOpts, MergedFixits);
+      FixItHints = MergedFixits;
+    }
+
+    for (const auto &Hint : FixItHints)
+      if (Hint.RemoveRange.isValid())
+        MutableRanges.push_back(Hint.RemoveRange);
+
+    FullSourceLoc UnexpandedLoc = Loc;
+
+    // Find the ultimate expansion location for the diagnostic.
+    Loc = Loc.getFileLoc();
+
+    PresumedLoc PLoc = Loc.getPresumedLoc(DiagOpts->ShowPresumedLoc);
+
+    // First, if this diagnostic is not in the main file, print out the
+    // "included from" lines.
+    emitIncludeStack(Loc, PLoc, Level);
+
+    // Next, emit the actual diagnostic message and caret.
+    emitDiagnosticMessage(Loc, PLoc, Level, Message, Ranges, D);
+    emitCaret(Loc, Level, MutableRanges, FixItHints);
+
+    // If this location is within a macro, walk from UnexpandedLoc up to Loc
+    // and produce a macro backtrace.
+    if (UnexpandedLoc.isValid() && UnexpandedLoc.isMacroID()) {
+      emitMacroExpansions(UnexpandedLoc, Level, MutableRanges, FixItHints);
+    }
+  }
+
+  LastLoc = Loc;
+  LastLevel = Level;
+
+  endDiagnostic(D, Level);
+}
+
+void DiagnosticRenderer::emitStoredDiagnostic(StoredDiagnostic &Diag) {
+  emitDiagnostic(Diag.getLocation(), Diag.getLevel(), Diag.getMessage(),
+                 Diag.getRanges(), Diag.getFixIts(),
+                 &Diag);
+}
+
+void DiagnosticRenderer::emitBasicNote(StringRef Message) {
+  emitDiagnosticMessage(FullSourceLoc(), PresumedLoc(), DiagnosticsEngine::Note,
+                        Message, None, DiagOrStoredDiag());
+}
+
+/// Prints an include stack when appropriate for a particular
+/// diagnostic level and location.
+///
+/// This routine handles all the logic of suppressing particular include
+/// stacks (such as those for notes) and duplicate include stacks when
+/// repeated warnings occur within the same file. It also handles the logic
+/// of customizing the formatting and display of the include stack.
+///
+/// \param Loc   The diagnostic location.
+/// \param PLoc  The presumed location of the diagnostic location.
+/// \param Level The diagnostic level of the message this stack pertains to.
+void DiagnosticRenderer::emitIncludeStack(FullSourceLoc Loc, PresumedLoc PLoc,
+                                          DiagnosticsEngine::Level Level) {
+  FullSourceLoc IncludeLoc =
+      PLoc.isInvalid() ? FullSourceLoc()
+                       : FullSourceLoc(PLoc.getIncludeLoc(), Loc.getManager());
+
+  // Skip redundant include stacks altogether.
+  if (LastIncludeLoc == IncludeLoc)
+    return;
+
+  LastIncludeLoc = IncludeLoc;
+
+  if (!DiagOpts->ShowNoteIncludeStack && Level == DiagnosticsEngine::Note)
+    return;
+
+  if (IncludeLoc.isValid())
+    emitIncludeStackRecursively(IncludeLoc);
+  else {
+    emitModuleBuildStack(Loc.getManager());
+    emitImportStack(Loc);
+  }
+}
+
+/// Helper to recursively walk up the include stack and print each layer
+/// on the way back down.
+void DiagnosticRenderer::emitIncludeStackRecursively(FullSourceLoc Loc) {
+  if (Loc.isInvalid()) {
+    emitModuleBuildStack(Loc.getManager());
+    return;
+  }
+
+  PresumedLoc PLoc = Loc.getPresumedLoc(DiagOpts->ShowPresumedLoc);
+  if (PLoc.isInvalid())
+    return;
+
+  // If this source location was imported from a module, print the module
+  // import stack rather than the
+  // FIXME: We want submodule granularity here.
+  std::pair<FullSourceLoc, StringRef> Imported = Loc.getModuleImportLoc();
+  if (!Imported.second.empty()) {
+    // This location was imported by a module. Emit the module import stack.
+    emitImportStackRecursively(Imported.first, Imported.second);
+    return;
+  }
+
+  // Emit the other include frames first.
+  emitIncludeStackRecursively(
+      FullSourceLoc(PLoc.getIncludeLoc(), Loc.getManager()));
+
+  // Emit the inclusion text/note.
+  emitIncludeLocation(Loc, PLoc);
+}
+
+/// Emit the module import stack associated with the current location.
+void DiagnosticRenderer::emitImportStack(FullSourceLoc Loc) {
+  if (Loc.isInvalid()) {
+    emitModuleBuildStack(Loc.getManager());
+    return;
+  }
+
+  std::pair<FullSourceLoc, StringRef> NextImportLoc = Loc.getModuleImportLoc();
+  emitImportStackRecursively(NextImportLoc.first, NextImportLoc.second);
+}
+
+/// Helper to recursively walk up the import stack and print each layer
+/// on the way back down.
+void DiagnosticRenderer::emitImportStackRecursively(FullSourceLoc Loc,
+                                                    StringRef ModuleName) {
+  if (ModuleName.empty()) {
+    return;
+  }
+
+  PresumedLoc PLoc = Loc.getPresumedLoc(DiagOpts->ShowPresumedLoc);
+
+  // Emit the other import frames first.
+  std::pair<FullSourceLoc, StringRef> NextImportLoc = Loc.getModuleImportLoc();
+  emitImportStackRecursively(NextImportLoc.first, NextImportLoc.second);
+
+  // Emit the inclusion text/note.
+  emitImportLocation(Loc, PLoc, ModuleName);
+}
+
+/// Emit the module build stack, for cases where a module is (re-)built
+/// on demand.
+void DiagnosticRenderer::emitModuleBuildStack(const SourceManager &SM) {
+  ModuleBuildStack Stack = SM.getModuleBuildStack();
+  for (const auto &I : Stack) {
+    emitBuildingModuleLocation(I.second, I.second.getPresumedLoc(
+                                              DiagOpts->ShowPresumedLoc),
+                               I.first);
+  }
+}
+
+/// A recursive function to trace all possible backtrace locations
+/// to match the \p CaretLocFileID.
+static SourceLocation
+retrieveMacroLocation(SourceLocation Loc, FileID MacroFileID,
+                      FileID CaretFileID,
+                      const SmallVectorImpl<FileID> &CommonArgExpansions,
+                      bool IsBegin, const SourceManager *SM,
+                      bool &IsTokenRange) {
+  assert(SM->getFileID(Loc) == MacroFileID);
+  if (MacroFileID == CaretFileID)
+    return Loc;
+  if (!Loc.isMacroID())
+    return {};
+
+  CharSourceRange MacroRange, MacroArgRange;
+
+  if (SM->isMacroArgExpansion(Loc)) {
+    // Only look at the immediate spelling location of this macro argument if
+    // the other location in the source range is also present in that expansion.
+    if (std::binary_search(CommonArgExpansions.begin(),
+                           CommonArgExpansions.end(), MacroFileID))
+      MacroRange =
+          CharSourceRange(SM->getImmediateSpellingLoc(Loc), IsTokenRange);
+    MacroArgRange = SM->getImmediateExpansionRange(Loc);
+  } else {
+    MacroRange = SM->getImmediateExpansionRange(Loc);
+    MacroArgRange =
+        CharSourceRange(SM->getImmediateSpellingLoc(Loc), IsTokenRange);
+  }
+
+  SourceLocation MacroLocation =
+      IsBegin ? MacroRange.getBegin() : MacroRange.getEnd();
+  if (MacroLocation.isValid()) {
+    MacroFileID = SM->getFileID(MacroLocation);
+    bool TokenRange = IsBegin ? IsTokenRange : MacroRange.isTokenRange();
+    MacroLocation =
+        retrieveMacroLocation(MacroLocation, MacroFileID, CaretFileID,
+                              CommonArgExpansions, IsBegin, SM, TokenRange);
+    if (MacroLocation.isValid()) {
+      IsTokenRange = TokenRange;
+      return MacroLocation;
+    }
+  }
+
+  // If we moved the end of the range to an expansion location, we now have
+  // a range of the same kind as the expansion range.
+  if (!IsBegin)
+    IsTokenRange = MacroArgRange.isTokenRange();
+
+  SourceLocation MacroArgLocation =
+      IsBegin ? MacroArgRange.getBegin() : MacroArgRange.getEnd();
+  MacroFileID = SM->getFileID(MacroArgLocation);
+  return retrieveMacroLocation(MacroArgLocation, MacroFileID, CaretFileID,
+                               CommonArgExpansions, IsBegin, SM, IsTokenRange);
+}
+
+/// Walk up the chain of macro expansions and collect the FileIDs identifying the
+/// expansions.
+static void getMacroArgExpansionFileIDs(SourceLocation Loc,
+                                        SmallVectorImpl<FileID> &IDs,
+                                        bool IsBegin, const SourceManager *SM) {
+  while (Loc.isMacroID()) {
+    if (SM->isMacroArgExpansion(Loc)) {
+      IDs.push_back(SM->getFileID(Loc));
+      Loc = SM->getImmediateSpellingLoc(Loc);
+    } else {
+      auto ExpRange = SM->getImmediateExpansionRange(Loc);
+      Loc = IsBegin ? ExpRange.getBegin() : ExpRange.getEnd();
+    }
+  }
+}
+
+/// Collect the expansions of the begin and end locations and compute the set
+/// intersection. Produces a sorted vector of FileIDs in CommonArgExpansions.
+static void computeCommonMacroArgExpansionFileIDs(
+    SourceLocation Begin, SourceLocation End, const SourceManager *SM,
+    SmallVectorImpl<FileID> &CommonArgExpansions) {
+  SmallVector<FileID, 4> BeginArgExpansions;
+  SmallVector<FileID, 4> EndArgExpansions;
+  getMacroArgExpansionFileIDs(Begin, BeginArgExpansions, /*IsBegin=*/true, SM);
+  getMacroArgExpansionFileIDs(End, EndArgExpansions, /*IsBegin=*/false, SM);
+  llvm::sort(BeginArgExpansions);
+  llvm::sort(EndArgExpansions);
+  std::set_intersection(BeginArgExpansions.begin(), BeginArgExpansions.end(),
+                        EndArgExpansions.begin(), EndArgExpansions.end(),
+                        std::back_inserter(CommonArgExpansions));
+}
+
+// Helper function to fix up source ranges.  It takes in an array of ranges,
+// and outputs an array of ranges where we want to draw the range highlighting
+// around the location specified by CaretLoc.
+//
+// To find locations which correspond to the caret, we crawl the macro caller
+// chain for the beginning and end of each range.  If the caret location
+// is in a macro expansion, we search each chain for a location
+// in the same expansion as the caret; otherwise, we crawl to the top of
+// each chain. Two locations are part of the same macro expansion
+// iff the FileID is the same.
+static void
+mapDiagnosticRanges(FullSourceLoc CaretLoc, ArrayRef<CharSourceRange> Ranges,
+                    SmallVectorImpl<CharSourceRange> &SpellingRanges) {
+  FileID CaretLocFileID = CaretLoc.getFileID();
+
+  const SourceManager *SM = &CaretLoc.getManager();
+
+  for (const auto &Range : Ranges) {
+    if (Range.isInvalid())
+      continue;
+
+    SourceLocation Begin = Range.getBegin(), End = Range.getEnd();
+    bool IsTokenRange = Range.isTokenRange();
+
+    FileID BeginFileID = SM->getFileID(Begin);
+    FileID EndFileID = SM->getFileID(End);
+
+    // Find the common parent for the beginning and end of the range.
+
+    // First, crawl the expansion chain for the beginning of the range.
+    llvm::SmallDenseMap<FileID, SourceLocation> BeginLocsMap;
+    while (Begin.isMacroID() && BeginFileID != EndFileID) {
+      BeginLocsMap[BeginFileID] = Begin;
+      Begin = SM->getImmediateExpansionRange(Begin).getBegin();
+      BeginFileID = SM->getFileID(Begin);
+    }
+
+    // Then, crawl the expansion chain for the end of the range.
+    if (BeginFileID != EndFileID) {
+      while (End.isMacroID() && !BeginLocsMap.count(EndFileID)) {
+        auto Exp = SM->getImmediateExpansionRange(End);
+        IsTokenRange = Exp.isTokenRange();
+        End = Exp.getEnd();
+        EndFileID = SM->getFileID(End);
+      }
+      if (End.isMacroID()) {
+        Begin = BeginLocsMap[EndFileID];
+        BeginFileID = EndFileID;
+      }
+    }
+
+    // There is a chance that begin or end is invalid here, for example if
+    // specific compile error is reported.
+    // It is possible that the FileID's do not match, if one comes from an
+    // included file. In this case we can not produce a meaningful source range.
+    if (Begin.isInvalid() || End.isInvalid() || BeginFileID != EndFileID)
+      continue;
+
+    // Do the backtracking.
+    SmallVector<FileID, 4> CommonArgExpansions;
+    computeCommonMacroArgExpansionFileIDs(Begin, End, SM, CommonArgExpansions);
+    Begin = retrieveMacroLocation(Begin, BeginFileID, CaretLocFileID,
+                                  CommonArgExpansions, /*IsBegin=*/true, SM,
+                                  IsTokenRange);
+    End = retrieveMacroLocation(End, BeginFileID, CaretLocFileID,
+                                CommonArgExpansions, /*IsBegin=*/false, SM,
+                                IsTokenRange);
+    if (Begin.isInvalid() || End.isInvalid()) continue;
+
+    // Return the spelling location of the beginning and end of the range.
+    Begin = SM->getSpellingLoc(Begin);
+    End = SM->getSpellingLoc(End);
+
+    SpellingRanges.push_back(CharSourceRange(SourceRange(Begin, End),
+                                             IsTokenRange));
+  }
+}
+
+void DiagnosticRenderer::emitCaret(FullSourceLoc Loc,
+                                   DiagnosticsEngine::Level Level,
+                                   ArrayRef<CharSourceRange> Ranges,
+                                   ArrayRef<FixItHint> Hints) {
+  SmallVector<CharSourceRange, 4> SpellingRanges;
+  mapDiagnosticRanges(Loc, Ranges, SpellingRanges);
+  emitCodeContext(Loc, Level, SpellingRanges, Hints);
+}
+
+/// A helper function for emitMacroExpansion to print the
+/// macro expansion message
+void DiagnosticRenderer::emitSingleMacroExpansion(
+    FullSourceLoc Loc, DiagnosticsEngine::Level Level,
+    ArrayRef<CharSourceRange> Ranges) {
+  // Find the spelling location for the macro definition. We must use the
+  // spelling location here to avoid emitting a macro backtrace for the note.
+  FullSourceLoc SpellingLoc = Loc.getSpellingLoc();
+
+  // Map the ranges into the FileID of the diagnostic location.
+  SmallVector<CharSourceRange, 4> SpellingRanges;
+  mapDiagnosticRanges(Loc, Ranges, SpellingRanges);
+
+  SmallString<100> MessageStorage;
+  llvm::raw_svector_ostream Message(MessageStorage);
+  StringRef MacroName = Lexer::getImmediateMacroNameForDiagnostics(
+      Loc, Loc.getManager(), LangOpts);
+  if (MacroName.empty())
+    Message << "expanded from here";
+  else
+    Message << "expanded from macro '" << MacroName << "'";
+
+  emitDiagnostic(SpellingLoc, DiagnosticsEngine::Note, Message.str(),
+                 SpellingRanges, None);
+}
+
+/// Check that the macro argument location of Loc starts with ArgumentLoc.
+/// The starting location of the macro expansions is used to differeniate
+/// different macro expansions.
+static bool checkLocForMacroArgExpansion(SourceLocation Loc,
+                                         const SourceManager &SM,
+                                         SourceLocation ArgumentLoc) {
+  SourceLocation MacroLoc;
+  if (SM.isMacroArgExpansion(Loc, &MacroLoc)) {
+    if (ArgumentLoc == MacroLoc) return true;
+  }
+
+  return false;
+}
+
+/// Check if all the locations in the range have the same macro argument
+/// expansion, and that the expansion starts with ArgumentLoc.
+static bool checkRangeForMacroArgExpansion(CharSourceRange Range,
+                                           const SourceManager &SM,
+                                           SourceLocation ArgumentLoc) {
+  SourceLocation BegLoc = Range.getBegin(), EndLoc = Range.getEnd();
+  while (BegLoc != EndLoc) {
+    if (!checkLocForMacroArgExpansion(BegLoc, SM, ArgumentLoc))
+      return false;
+    BegLoc.getLocWithOffset(1);
+  }
+
+  return checkLocForMacroArgExpansion(BegLoc, SM, ArgumentLoc);
+}
+
+/// A helper function to check if the current ranges are all inside the same
+/// macro argument expansion as Loc.
+static bool checkRangesForMacroArgExpansion(FullSourceLoc Loc,
+                                            ArrayRef<CharSourceRange> Ranges) {
+  assert(Loc.isMacroID() && "Must be a macro expansion!");
+
+  SmallVector<CharSourceRange, 4> SpellingRanges;
+  mapDiagnosticRanges(Loc, Ranges, SpellingRanges);
+
+  /// Count all valid ranges.
+  unsigned ValidCount = 0;
+  for (const auto &Range : Ranges)
+    if (Range.isValid())
+      ValidCount++;
+
+  if (ValidCount > SpellingRanges.size())
+    return false;
+
+  /// To store the source location of the argument location.
+  FullSourceLoc ArgumentLoc;
+
+  /// Set the ArgumentLoc to the beginning location of the expansion of Loc
+  /// so to check if the ranges expands to the same beginning location.
+  if (!Loc.isMacroArgExpansion(&ArgumentLoc))
+    return false;
+
+  for (const auto &Range : SpellingRanges)
+    if (!checkRangeForMacroArgExpansion(Range, Loc.getManager(), ArgumentLoc))
+      return false;
+
+  return true;
+}
+
+/// Recursively emit notes for each macro expansion and caret
+/// diagnostics where appropriate.
+///
+/// Walks up the macro expansion stack printing expansion notes, the code
+/// snippet, caret, underlines and FixItHint display as appropriate at each
+/// level.
+///
+/// \param Loc The location for this caret.
+/// \param Level The diagnostic level currently being emitted.
+/// \param Ranges The underlined ranges for this code snippet.
+/// \param Hints The FixIt hints active for this diagnostic.
+void DiagnosticRenderer::emitMacroExpansions(FullSourceLoc Loc,
+                                             DiagnosticsEngine::Level Level,
+                                             ArrayRef<CharSourceRange> Ranges,
+                                             ArrayRef<FixItHint> Hints) {
+  assert(Loc.isValid() && "must have a valid source location here");
+  const SourceManager &SM = Loc.getManager();
+  SourceLocation L = Loc;
+
+  // Produce a stack of macro backtraces.
+  SmallVector<SourceLocation, 8> LocationStack;
+  unsigned IgnoredEnd = 0;
+  while (L.isMacroID()) {
+    // If this is the expansion of a macro argument, point the caret at the
+    // use of the argument in the definition of the macro, not the expansion.
+    if (SM.isMacroArgExpansion(L))
+      LocationStack.push_back(SM.getImmediateExpansionRange(L).getBegin());
+    else
+      LocationStack.push_back(L);
+
+    if (checkRangesForMacroArgExpansion(FullSourceLoc(L, SM), Ranges))
+      IgnoredEnd = LocationStack.size();
+
+    L = SM.getImmediateMacroCallerLoc(L);
+
+    // Once the location no longer points into a macro, try stepping through
+    // the last found location.  This sometimes produces additional useful
+    // backtraces.
+    if (L.isFileID())
+      L = SM.getImmediateMacroCallerLoc(LocationStack.back());
+    assert(L.isValid() && "must have a valid source location here");
+  }
+
+  LocationStack.erase(LocationStack.begin(),
+                      LocationStack.begin() + IgnoredEnd);
+
+  unsigned MacroDepth = LocationStack.size();
+  unsigned MacroLimit = DiagOpts->MacroBacktraceLimit;
+  if (MacroDepth <= MacroLimit || MacroLimit == 0) {
+    for (auto I = LocationStack.rbegin(), E = LocationStack.rend();
+         I != E; ++I)
+      emitSingleMacroExpansion(FullSourceLoc(*I, SM), Level, Ranges);
+    return;
+  }
+
+  unsigned MacroStartMessages = MacroLimit / 2;
+  unsigned MacroEndMessages = MacroLimit / 2 + MacroLimit % 2;
+
+  for (auto I = LocationStack.rbegin(),
+            E = LocationStack.rbegin() + MacroStartMessages;
+       I != E; ++I)
+    emitSingleMacroExpansion(FullSourceLoc(*I, SM), Level, Ranges);
+
+  SmallString<200> MessageStorage;
+  llvm::raw_svector_ostream Message(MessageStorage);
+  Message << "(skipping " << (MacroDepth - MacroLimit)
+          << " expansions in backtrace; use -fmacro-backtrace-limit=0 to "
+             "see all)";
+  emitBasicNote(Message.str());
+
+  for (auto I = LocationStack.rend() - MacroEndMessages,
+            E = LocationStack.rend();
+       I != E; ++I)
+    emitSingleMacroExpansion(FullSourceLoc(*I, SM), Level, Ranges);
+}
+
+DiagnosticNoteRenderer::~DiagnosticNoteRenderer() = default;
+
+void DiagnosticNoteRenderer::emitIncludeLocation(FullSourceLoc Loc,
+                                                 PresumedLoc PLoc) {
+  // Generate a note indicating the include location.
+  SmallString<200> MessageStorage;
+  llvm::raw_svector_ostream Message(MessageStorage);
+  Message << "in file included from " << PLoc.getFilename() << ':'
+          << PLoc.getLine() << ":";
+  emitNote(Loc, Message.str());
+}
+
+void DiagnosticNoteRenderer::emitImportLocation(FullSourceLoc Loc,
+                                                PresumedLoc PLoc,
+                                                StringRef ModuleName) {
+  // Generate a note indicating the include location.
+  SmallString<200> MessageStorage;
+  llvm::raw_svector_ostream Message(MessageStorage);
+  Message << "in module '" << ModuleName;
+  if (PLoc.isValid())
+    Message << "' imported from " << PLoc.getFilename() << ':'
+            << PLoc.getLine();
+  Message << ":";
+  emitNote(Loc, Message.str());
+}
+
+void DiagnosticNoteRenderer::emitBuildingModuleLocation(FullSourceLoc Loc,
+                                                        PresumedLoc PLoc,
+                                                        StringRef ModuleName) {
+  // Generate a note indicating the include location.
+  SmallString<200> MessageStorage;
+  llvm::raw_svector_ostream Message(MessageStorage);
+  if (PLoc.isValid())
+    Message << "while building module '" << ModuleName << "' imported from "
+            << PLoc.getFilename() << ':' << PLoc.getLine() << ":";
+  else
+    Message << "while building module '" << ModuleName << "':";
+  emitNote(Loc, Message.str());
+}
diff --git a/contrib/libs/clang14/lib/Frontend/ExtractAPIConsumer.cpp b/contrib/libs/clang14/lib/Frontend/ExtractAPIConsumer.cpp
new file mode 100644
index 0000000000..cdf67f3c32
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ExtractAPIConsumer.cpp
@@ -0,0 +1,32 @@
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Frontend/ASTConsumers.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+
+using namespace clang;
+
+namespace {
+class ExtractAPIVisitor : public RecursiveASTVisitor<ExtractAPIVisitor> {
+public:
+  bool VisitNamedDecl(NamedDecl *Decl) {
+    llvm::outs() << Decl->getName() << "\n";
+    return true;
+  }
+};
+
+class ExtractAPIConsumer : public ASTConsumer {
+public:
+  void HandleTranslationUnit(ASTContext &Context) override {
+    Visitor.TraverseDecl(Context.getTranslationUnitDecl());
+  }
+
+private:
+  ExtractAPIVisitor Visitor;
+};
+} // namespace
+
+std::unique_ptr<ASTConsumer>
+ExtractAPIAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return std::make_unique<ExtractAPIConsumer>();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/FrontendAction.cpp b/contrib/libs/clang14/lib/Frontend/FrontendAction.cpp
new file mode 100644
index 0000000000..089f40b360
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/FrontendAction.cpp
@@ -0,0 +1,1138 @@
+//===--- FrontendAction.cpp -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/FrontendAction.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/DeclGroup.h"
+#include "clang/Basic/Builtins.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendPluginRegistry.h"
+#include "clang/Frontend/LayoutOverrideSource.h"
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/LiteralSupport.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Serialization/ASTDeserializationListener.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/GlobalModuleIndex.h"
+#include "llvm/ADT/ScopeExit.h"
+#include "llvm/Support/BuryPointer.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <system_error>
+using namespace clang;
+
+LLVM_INSTANTIATE_REGISTRY(FrontendPluginRegistry)
+
+namespace {
+
+class DelegatingDeserializationListener : public ASTDeserializationListener {
+  ASTDeserializationListener *Previous;
+  bool DeletePrevious;
+
+public:
+  explicit DelegatingDeserializationListener(
+      ASTDeserializationListener *Previous, bool DeletePrevious)
+      : Previous(Previous), DeletePrevious(DeletePrevious) {}
+  ~DelegatingDeserializationListener() override {
+    if (DeletePrevious)
+      delete Previous;
+  }
+
+  void ReaderInitialized(ASTReader *Reader) override {
+    if (Previous)
+      Previous->ReaderInitialized(Reader);
+  }
+  void IdentifierRead(serialization::IdentID ID,
+                      IdentifierInfo *II) override {
+    if (Previous)
+      Previous->IdentifierRead(ID, II);
+  }
+  void TypeRead(serialization::TypeIdx Idx, QualType T) override {
+    if (Previous)
+      Previous->TypeRead(Idx, T);
+  }
+  void DeclRead(serialization::DeclID ID, const Decl *D) override {
+    if (Previous)
+      Previous->DeclRead(ID, D);
+  }
+  void SelectorRead(serialization::SelectorID ID, Selector Sel) override {
+    if (Previous)
+      Previous->SelectorRead(ID, Sel);
+  }
+  void MacroDefinitionRead(serialization::PreprocessedEntityID PPID,
+                           MacroDefinitionRecord *MD) override {
+    if (Previous)
+      Previous->MacroDefinitionRead(PPID, MD);
+  }
+};
+
+/// Dumps deserialized declarations.
+class DeserializedDeclsDumper : public DelegatingDeserializationListener {
+public:
+  explicit DeserializedDeclsDumper(ASTDeserializationListener *Previous,
+                                   bool DeletePrevious)
+      : DelegatingDeserializationListener(Previous, DeletePrevious) {}
+
+  void DeclRead(serialization::DeclID ID, const Decl *D) override {
+    llvm::outs() << "PCH DECL: " << D->getDeclKindName();
+    if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) {
+      llvm::outs() << " - ";
+      ND->printQualifiedName(llvm::outs());
+    }
+    llvm::outs() << "\n";
+
+    DelegatingDeserializationListener::DeclRead(ID, D);
+  }
+};
+
+/// Checks deserialized declarations and emits error if a name
+/// matches one given in command-line using -error-on-deserialized-decl.
+class DeserializedDeclsChecker : public DelegatingDeserializationListener {
+  ASTContext &Ctx;
+  std::set<std::string> NamesToCheck;
+
+public:
+  DeserializedDeclsChecker(ASTContext &Ctx,
+                           const std::set<std::string> &NamesToCheck,
+                           ASTDeserializationListener *Previous,
+                           bool DeletePrevious)
+      : DelegatingDeserializationListener(Previous, DeletePrevious), Ctx(Ctx),
+        NamesToCheck(NamesToCheck) {}
+
+  void DeclRead(serialization::DeclID ID, const Decl *D) override {
+    if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
+      if (NamesToCheck.find(ND->getNameAsString()) != NamesToCheck.end()) {
+        unsigned DiagID
+          = Ctx.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Error,
+                                                 "%0 was deserialized");
+        Ctx.getDiagnostics().Report(Ctx.getFullLoc(D->getLocation()), DiagID)
+            << ND;
+      }
+
+    DelegatingDeserializationListener::DeclRead(ID, D);
+  }
+};
+
+} // end anonymous namespace
+
+FrontendAction::FrontendAction() : Instance(nullptr) {}
+
+FrontendAction::~FrontendAction() {}
+
+void FrontendAction::setCurrentInput(const FrontendInputFile &CurrentInput,
+                                     std::unique_ptr<ASTUnit> AST) {
+  this->CurrentInput = CurrentInput;
+  CurrentASTUnit = std::move(AST);
+}
+
+Module *FrontendAction::getCurrentModule() const {
+  CompilerInstance &CI = getCompilerInstance();
+  return CI.getPreprocessor().getHeaderSearchInfo().lookupModule(
+      CI.getLangOpts().CurrentModule, SourceLocation(), /*AllowSearch*/false);
+}
+
+std::unique_ptr<ASTConsumer>
+FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI,
+                                         StringRef InFile) {
+  std::unique_ptr<ASTConsumer> Consumer = CreateASTConsumer(CI, InFile);
+  if (!Consumer)
+    return nullptr;
+
+  // Validate -add-plugin args.
+  bool FoundAllPlugins = true;
+  for (const std::string &Arg : CI.getFrontendOpts().AddPluginActions) {
+    bool Found = false;
+    for (const FrontendPluginRegistry::entry &Plugin :
+         FrontendPluginRegistry::entries()) {
+      if (Plugin.getName() == Arg)
+        Found = true;
+    }
+    if (!Found) {
+      CI.getDiagnostics().Report(diag::err_fe_invalid_plugin_name) << Arg;
+      FoundAllPlugins = false;
+    }
+  }
+  if (!FoundAllPlugins)
+    return nullptr;
+
+  // If there are no registered plugins we don't need to wrap the consumer
+  if (FrontendPluginRegistry::begin() == FrontendPluginRegistry::end())
+    return Consumer;
+
+  // If this is a code completion run, avoid invoking the plugin consumers
+  if (CI.hasCodeCompletionConsumer())
+    return Consumer;
+
+  // Collect the list of plugins that go before the main action (in Consumers)
+  // or after it (in AfterConsumers)
+  std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+  std::vector<std::unique_ptr<ASTConsumer>> AfterConsumers;
+  for (const FrontendPluginRegistry::entry &Plugin :
+       FrontendPluginRegistry::entries()) {
+    std::unique_ptr<PluginASTAction> P = Plugin.instantiate();
+    PluginASTAction::ActionType ActionType = P->getActionType();
+    if (ActionType == PluginASTAction::CmdlineAfterMainAction ||
+        ActionType == PluginASTAction::CmdlineBeforeMainAction) {
+      // This is O(|plugins| * |add_plugins|), but since both numbers are
+      // way below 50 in practice, that's ok.
+      if (llvm::any_of(CI.getFrontendOpts().AddPluginActions,
+                       [&](const std::string &PluginAction) {
+                         return PluginAction == Plugin.getName();
+                       })) {
+        if (ActionType == PluginASTAction::CmdlineBeforeMainAction)
+          ActionType = PluginASTAction::AddBeforeMainAction;
+        else
+          ActionType = PluginASTAction::AddAfterMainAction;
+      }
+    }
+    if ((ActionType == PluginASTAction::AddBeforeMainAction ||
+         ActionType == PluginASTAction::AddAfterMainAction) &&
+        P->ParseArgs(
+            CI,
+            CI.getFrontendOpts().PluginArgs[std::string(Plugin.getName())])) {
+      std::unique_ptr<ASTConsumer> PluginConsumer = P->CreateASTConsumer(CI, InFile);
+      if (ActionType == PluginASTAction::AddBeforeMainAction) {
+        Consumers.push_back(std::move(PluginConsumer));
+      } else {
+        AfterConsumers.push_back(std::move(PluginConsumer));
+      }
+    }
+  }
+
+  // Add to Consumers the main consumer, then all the plugins that go after it
+  Consumers.push_back(std::move(Consumer));
+  if (!AfterConsumers.empty()) {
+    // If we have plugins after the main consumer, which may be the codegen
+    // action, they likely will need the ASTContext, so don't clear it in the
+    // codegen action.
+    CI.getCodeGenOpts().ClearASTBeforeBackend = false;
+    for (auto &C : AfterConsumers)
+      Consumers.push_back(std::move(C));
+  }
+
+  return std::make_unique<MultiplexConsumer>(std::move(Consumers));
+}
+
+/// For preprocessed files, if the first line is the linemarker and specifies
+/// the original source file name, use that name as the input file name.
+/// Returns the location of the first token after the line marker directive.
+///
+/// \param CI The compiler instance.
+/// \param InputFile Populated with the filename from the line marker.
+/// \param IsModuleMap If \c true, add a line note corresponding to this line
+///        directive. (We need to do this because the directive will not be
+///        visited by the preprocessor.)
+static SourceLocation ReadOriginalFileName(CompilerInstance &CI,
+                                           std::string &InputFile,
+                                           bool IsModuleMap = false) {
+  auto &SourceMgr = CI.getSourceManager();
+  auto MainFileID = SourceMgr.getMainFileID();
+
+  auto MainFileBuf = SourceMgr.getBufferOrNone(MainFileID);
+  if (!MainFileBuf)
+    return SourceLocation();
+
+  std::unique_ptr<Lexer> RawLexer(
+      new Lexer(MainFileID, *MainFileBuf, SourceMgr, CI.getLangOpts()));
+
+  // If the first line has the syntax of
+  //
+  // # NUM "FILENAME"
+  //
+  // we use FILENAME as the input file name.
+  Token T;
+  if (RawLexer->LexFromRawLexer(T) || T.getKind() != tok::hash)
+    return SourceLocation();
+  if (RawLexer->LexFromRawLexer(T) || T.isAtStartOfLine() ||
+      T.getKind() != tok::numeric_constant)
+    return SourceLocation();
+
+  unsigned LineNo;
+  SourceLocation LineNoLoc = T.getLocation();
+  if (IsModuleMap) {
+    llvm::SmallString<16> Buffer;
+    if (Lexer::getSpelling(LineNoLoc, Buffer, SourceMgr, CI.getLangOpts())
+            .getAsInteger(10, LineNo))
+      return SourceLocation();
+  }
+
+  RawLexer->LexFromRawLexer(T);
+  if (T.isAtStartOfLine() || T.getKind() != tok::string_literal)
+    return SourceLocation();
+
+  StringLiteralParser Literal(T, CI.getPreprocessor());
+  if (Literal.hadError)
+    return SourceLocation();
+  RawLexer->LexFromRawLexer(T);
+  if (T.isNot(tok::eof) && !T.isAtStartOfLine())
+    return SourceLocation();
+  InputFile = Literal.GetString().str();
+
+  if (IsModuleMap)
+    CI.getSourceManager().AddLineNote(
+        LineNoLoc, LineNo, SourceMgr.getLineTableFilenameID(InputFile), false,
+        false, SrcMgr::C_User_ModuleMap);
+
+  return T.getLocation();
+}
+
+static SmallVectorImpl<char> &
+operator+=(SmallVectorImpl<char> &Includes, StringRef RHS) {
+  Includes.append(RHS.begin(), RHS.end());
+  return Includes;
+}
+
+static void addHeaderInclude(StringRef HeaderName,
+                             SmallVectorImpl<char> &Includes,
+                             const LangOptions &LangOpts,
+                             bool IsExternC) {
+  if (IsExternC && LangOpts.CPlusPlus)
+    Includes += "extern \"C\" {\n";
+  if (LangOpts.ObjC)
+    Includes += "#import \"";
+  else
+    Includes += "#include \"";
+
+  Includes += HeaderName;
+
+  Includes += "\"\n";
+  if (IsExternC && LangOpts.CPlusPlus)
+    Includes += "}\n";
+}
+
+/// Collect the set of header includes needed to construct the given
+/// module and update the TopHeaders file set of the module.
+///
+/// \param Module The module we're collecting includes from.
+///
+/// \param Includes Will be augmented with the set of \#includes or \#imports
+/// needed to load all of the named headers.
+static std::error_code collectModuleHeaderIncludes(
+    const LangOptions &LangOpts, FileManager &FileMgr, DiagnosticsEngine &Diag,
+    ModuleMap &ModMap, clang::Module *Module, SmallVectorImpl<char> &Includes) {
+  // Don't collect any headers for unavailable modules.
+  if (!Module->isAvailable())
+    return std::error_code();
+
+  // Resolve all lazy header directives to header files.
+  ModMap.resolveHeaderDirectives(Module);
+
+  // If any headers are missing, we can't build this module. In most cases,
+  // diagnostics for this should have already been produced; we only get here
+  // if explicit stat information was provided.
+  // FIXME: If the name resolves to a file with different stat information,
+  // produce a better diagnostic.
+  if (!Module->MissingHeaders.empty()) {
+    auto &MissingHeader = Module->MissingHeaders.front();
+    Diag.Report(MissingHeader.FileNameLoc, diag::err_module_header_missing)
+      << MissingHeader.IsUmbrella << MissingHeader.FileName;
+    return std::error_code();
+  }
+
+  // Add includes for each of these headers.
+  for (auto HK : {Module::HK_Normal, Module::HK_Private}) {
+    for (Module::Header &H : Module->Headers[HK]) {
+      Module->addTopHeader(H.Entry);
+      // Use the path as specified in the module map file. We'll look for this
+      // file relative to the module build directory (the directory containing
+      // the module map file) so this will find the same file that we found
+      // while parsing the module map.
+      addHeaderInclude(H.PathRelativeToRootModuleDirectory, Includes, LangOpts,
+                       Module->IsExternC);
+    }
+  }
+  // Note that Module->PrivateHeaders will not be a TopHeader.
+
+  if (Module::Header UmbrellaHeader = Module->getUmbrellaHeader()) {
+    Module->addTopHeader(UmbrellaHeader.Entry);
+    if (Module->Parent)
+      // Include the umbrella header for submodules.
+      addHeaderInclude(UmbrellaHeader.PathRelativeToRootModuleDirectory,
+                       Includes, LangOpts, Module->IsExternC);
+  } else if (Module::DirectoryName UmbrellaDir = Module->getUmbrellaDir()) {
+    // Add all of the headers we find in this subdirectory.
+    std::error_code EC;
+    SmallString<128> DirNative;
+    llvm::sys::path::native(UmbrellaDir.Entry->getName(), DirNative);
+
+    llvm::vfs::FileSystem &FS = FileMgr.getVirtualFileSystem();
+    SmallVector<std::pair<std::string, const FileEntry *>, 8> Headers;
+    for (llvm::vfs::recursive_directory_iterator Dir(FS, DirNative, EC), End;
+         Dir != End && !EC; Dir.increment(EC)) {
+      // Check whether this entry has an extension typically associated with
+      // headers.
+      if (!llvm::StringSwitch<bool>(llvm::sys::path::extension(Dir->path()))
+               .Cases(".h", ".H", ".hh", ".hpp", true)
+               .Default(false))
+        continue;
+
+      auto Header = FileMgr.getFile(Dir->path());
+      // FIXME: This shouldn't happen unless there is a file system race. Is
+      // that worth diagnosing?
+      if (!Header)
+        continue;
+
+      // If this header is marked 'unavailable' in this module, don't include
+      // it.
+      if (ModMap.isHeaderUnavailableInModule(*Header, Module))
+        continue;
+
+      // Compute the relative path from the directory to this file.
+      SmallVector<StringRef, 16> Components;
+      auto PathIt = llvm::sys::path::rbegin(Dir->path());
+      for (int I = 0; I != Dir.level() + 1; ++I, ++PathIt)
+        Components.push_back(*PathIt);
+      SmallString<128> RelativeHeader(
+          UmbrellaDir.PathRelativeToRootModuleDirectory);
+      for (auto It = Components.rbegin(), End = Components.rend(); It != End;
+           ++It)
+        llvm::sys::path::append(RelativeHeader, *It);
+
+      std::string RelName = RelativeHeader.c_str();
+      Headers.push_back(std::make_pair(RelName, *Header));
+    }
+
+    if (EC)
+      return EC;
+
+    // Sort header paths and make the header inclusion order deterministic
+    // across different OSs and filesystems.
+    llvm::sort(Headers.begin(), Headers.end(), [](
+      const std::pair<std::string, const FileEntry *> &LHS,
+      const std::pair<std::string, const FileEntry *> &RHS) {
+        return LHS.first < RHS.first;
+    });
+    for (auto &H : Headers) {
+      // Include this header as part of the umbrella directory.
+      Module->addTopHeader(H.second);
+      addHeaderInclude(H.first, Includes, LangOpts, Module->IsExternC);
+    }
+  }
+
+  // Recurse into submodules.
+  for (clang::Module::submodule_iterator Sub = Module->submodule_begin(),
+                                      SubEnd = Module->submodule_end();
+       Sub != SubEnd; ++Sub)
+    if (std::error_code Err = collectModuleHeaderIncludes(
+            LangOpts, FileMgr, Diag, ModMap, *Sub, Includes))
+      return Err;
+
+  return std::error_code();
+}
+
+static bool loadModuleMapForModuleBuild(CompilerInstance &CI, bool IsSystem,
+                                        bool IsPreprocessed,
+                                        std::string &PresumedModuleMapFile,
+                                        unsigned &Offset) {
+  auto &SrcMgr = CI.getSourceManager();
+  HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
+
+  // Map the current input to a file.
+  FileID ModuleMapID = SrcMgr.getMainFileID();
+  const FileEntry *ModuleMap = SrcMgr.getFileEntryForID(ModuleMapID);
+
+  // If the module map is preprocessed, handle the initial line marker;
+  // line directives are not part of the module map syntax in general.
+  Offset = 0;
+  if (IsPreprocessed) {
+    SourceLocation EndOfLineMarker =
+        ReadOriginalFileName(CI, PresumedModuleMapFile, /*IsModuleMap*/ true);
+    if (EndOfLineMarker.isValid())
+      Offset = CI.getSourceManager().getDecomposedLoc(EndOfLineMarker).second;
+  }
+
+  // Load the module map file.
+  if (HS.loadModuleMapFile(ModuleMap, IsSystem, ModuleMapID, &Offset,
+                           PresumedModuleMapFile))
+    return true;
+
+  if (SrcMgr.getBufferOrFake(ModuleMapID).getBufferSize() == Offset)
+    Offset = 0;
+
+  return false;
+}
+
+static Module *prepareToBuildModule(CompilerInstance &CI,
+                                    StringRef ModuleMapFilename) {
+  if (CI.getLangOpts().CurrentModule.empty()) {
+    CI.getDiagnostics().Report(diag::err_missing_module_name);
+
+    // FIXME: Eventually, we could consider asking whether there was just
+    // a single module described in the module map, and use that as a
+    // default. Then it would be fairly trivial to just "compile" a module
+    // map with a single module (the common case).
+    return nullptr;
+  }
+
+  // Dig out the module definition.
+  HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
+  Module *M = HS.lookupModule(CI.getLangOpts().CurrentModule, SourceLocation(),
+                              /*AllowSearch=*/true);
+  if (!M) {
+    CI.getDiagnostics().Report(diag::err_missing_module)
+      << CI.getLangOpts().CurrentModule << ModuleMapFilename;
+
+    return nullptr;
+  }
+
+  // Check whether we can build this module at all.
+  if (Preprocessor::checkModuleIsAvailable(CI.getLangOpts(), CI.getTarget(),
+                                           CI.getDiagnostics(), M))
+    return nullptr;
+
+  // Inform the preprocessor that includes from within the input buffer should
+  // be resolved relative to the build directory of the module map file.
+  CI.getPreprocessor().setMainFileDir(M->Directory);
+
+  // If the module was inferred from a different module map (via an expanded
+  // umbrella module definition), track that fact.
+  // FIXME: It would be preferable to fill this in as part of processing
+  // the module map, rather than adding it after the fact.
+  StringRef OriginalModuleMapName = CI.getFrontendOpts().OriginalModuleMap;
+  if (!OriginalModuleMapName.empty()) {
+    auto OriginalModuleMap =
+        CI.getFileManager().getFile(OriginalModuleMapName,
+                                    /*openFile*/ true);
+    if (!OriginalModuleMap) {
+      CI.getDiagnostics().Report(diag::err_module_map_not_found)
+        << OriginalModuleMapName;
+      return nullptr;
+    }
+    if (*OriginalModuleMap != CI.getSourceManager().getFileEntryForID(
+                                 CI.getSourceManager().getMainFileID())) {
+      M->IsInferred = true;
+      CI.getPreprocessor().getHeaderSearchInfo().getModuleMap()
+        .setInferredModuleAllowedBy(M, *OriginalModuleMap);
+    }
+  }
+
+  // If we're being run from the command-line, the module build stack will not
+  // have been filled in yet, so complete it now in order to allow us to detect
+  // module cycles.
+  SourceManager &SourceMgr = CI.getSourceManager();
+  if (SourceMgr.getModuleBuildStack().empty())
+    SourceMgr.pushModuleBuildStack(CI.getLangOpts().CurrentModule,
+                                   FullSourceLoc(SourceLocation(), SourceMgr));
+  return M;
+}
+
+/// Compute the input buffer that should be used to build the specified module.
+static std::unique_ptr<llvm::MemoryBuffer>
+getInputBufferForModule(CompilerInstance &CI, Module *M) {
+  FileManager &FileMgr = CI.getFileManager();
+
+  // Collect the set of #includes we need to build the module.
+  SmallString<256> HeaderContents;
+  std::error_code Err = std::error_code();
+  if (Module::Header UmbrellaHeader = M->getUmbrellaHeader())
+    addHeaderInclude(UmbrellaHeader.PathRelativeToRootModuleDirectory,
+                     HeaderContents, CI.getLangOpts(), M->IsExternC);
+  Err = collectModuleHeaderIncludes(
+      CI.getLangOpts(), FileMgr, CI.getDiagnostics(),
+      CI.getPreprocessor().getHeaderSearchInfo().getModuleMap(), M,
+      HeaderContents);
+
+  if (Err) {
+    CI.getDiagnostics().Report(diag::err_module_cannot_create_includes)
+      << M->getFullModuleName() << Err.message();
+    return nullptr;
+  }
+
+  return llvm::MemoryBuffer::getMemBufferCopy(
+      HeaderContents, Module::getModuleInputBufferName());
+}
+
+bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
+                                     const FrontendInputFile &RealInput) {
+  FrontendInputFile Input(RealInput);
+  assert(!Instance && "Already processing a source file!");
+  assert(!Input.isEmpty() && "Unexpected empty filename!");
+  setCurrentInput(Input);
+  setCompilerInstance(&CI);
+
+  bool HasBegunSourceFile = false;
+  bool ReplayASTFile = Input.getKind().getFormat() == InputKind::Precompiled &&
+                       usesPreprocessorOnly();
+
+  // If we fail, reset state since the client will not end up calling the
+  // matching EndSourceFile(). All paths that return true should release this.
+  auto FailureCleanup = llvm::make_scope_exit([&]() {
+    if (HasBegunSourceFile)
+      CI.getDiagnosticClient().EndSourceFile();
+    CI.clearOutputFiles(/*EraseFiles=*/true);
+    CI.getLangOpts().setCompilingModule(LangOptions::CMK_None);
+    setCurrentInput(FrontendInputFile());
+    setCompilerInstance(nullptr);
+  });
+
+  if (!BeginInvocation(CI))
+    return false;
+
+  // If we're replaying the build of an AST file, import it and set up
+  // the initial state from its build.
+  if (ReplayASTFile) {
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());
+
+    // The AST unit populates its own diagnostics engine rather than ours.
+    IntrusiveRefCntPtr<DiagnosticsEngine> ASTDiags(
+        new DiagnosticsEngine(Diags->getDiagnosticIDs(),
+                              &Diags->getDiagnosticOptions()));
+    ASTDiags->setClient(Diags->getClient(), /*OwnsClient*/false);
+
+    // FIXME: What if the input is a memory buffer?
+    StringRef InputFile = Input.getFile();
+
+    std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromASTFile(
+        std::string(InputFile), CI.getPCHContainerReader(),
+        ASTUnit::LoadPreprocessorOnly, ASTDiags, CI.getFileSystemOpts(),
+        CI.getCodeGenOpts().DebugTypeExtRefs);
+    if (!AST)
+      return false;
+
+    // Options relating to how we treat the input (but not what we do with it)
+    // are inherited from the AST unit.
+    CI.getHeaderSearchOpts() = AST->getHeaderSearchOpts();
+    CI.getPreprocessorOpts() = AST->getPreprocessorOpts();
+    CI.getLangOpts() = AST->getLangOpts();
+
+    // Set the shared objects, these are reset when we finish processing the
+    // file, otherwise the CompilerInstance will happily destroy them.
+    CI.setFileManager(&AST->getFileManager());
+    CI.createSourceManager(CI.getFileManager());
+    CI.getSourceManager().initializeForReplay(AST->getSourceManager());
+
+    // Preload all the module files loaded transitively by the AST unit. Also
+    // load all module map files that were parsed as part of building the AST
+    // unit.
+    if (auto ASTReader = AST->getASTReader()) {
+      auto &MM = ASTReader->getModuleManager();
+      auto &PrimaryModule = MM.getPrimaryModule();
+
+      for (serialization::ModuleFile &MF : MM)
+        if (&MF != &PrimaryModule)
+          CI.getFrontendOpts().ModuleFiles.push_back(MF.FileName);
+
+      ASTReader->visitTopLevelModuleMaps(
+          PrimaryModule, [&](const FileEntry *FE) {
+            CI.getFrontendOpts().ModuleMapFiles.push_back(
+                std::string(FE->getName()));
+          });
+    }
+
+    // Set up the input file for replay purposes.
+    auto Kind = AST->getInputKind();
+    if (Kind.getFormat() == InputKind::ModuleMap) {
+      Module *ASTModule =
+          AST->getPreprocessor().getHeaderSearchInfo().lookupModule(
+              AST->getLangOpts().CurrentModule, SourceLocation(),
+              /*AllowSearch*/ false);
+      assert(ASTModule && "module file does not define its own module");
+      Input = FrontendInputFile(ASTModule->PresumedModuleMapFile, Kind);
+    } else {
+      auto &OldSM = AST->getSourceManager();
+      FileID ID = OldSM.getMainFileID();
+      if (auto *File = OldSM.getFileEntryForID(ID))
+        Input = FrontendInputFile(File->getName(), Kind);
+      else
+        Input = FrontendInputFile(OldSM.getBufferOrFake(ID), Kind);
+    }
+    setCurrentInput(Input, std::move(AST));
+  }
+
+  // AST files follow a very different path, since they share objects via the
+  // AST unit.
+  if (Input.getKind().getFormat() == InputKind::Precompiled) {
+    assert(!usesPreprocessorOnly() && "this case was handled above");
+    assert(hasASTFileSupport() &&
+           "This action does not have AST file support!");
+
+    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());
+
+    // FIXME: What if the input is a memory buffer?
+    StringRef InputFile = Input.getFile();
+
+    std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromASTFile(
+        std::string(InputFile), CI.getPCHContainerReader(),
+        ASTUnit::LoadEverything, Diags, CI.getFileSystemOpts(),
+        CI.getCodeGenOpts().DebugTypeExtRefs);
+
+    if (!AST)
+      return false;
+
+    // Inform the diagnostic client we are processing a source file.
+    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
+    HasBegunSourceFile = true;
+
+    // Set the shared objects, these are reset when we finish processing the
+    // file, otherwise the CompilerInstance will happily destroy them.
+    CI.setFileManager(&AST->getFileManager());
+    CI.setSourceManager(&AST->getSourceManager());
+    CI.setPreprocessor(AST->getPreprocessorPtr());
+    Preprocessor &PP = CI.getPreprocessor();
+    PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
+                                           PP.getLangOpts());
+    CI.setASTContext(&AST->getASTContext());
+
+    setCurrentInput(Input, std::move(AST));
+
+    // Initialize the action.
+    if (!BeginSourceFileAction(CI))
+      return false;
+
+    // Create the AST consumer.
+    CI.setASTConsumer(CreateWrappedASTConsumer(CI, InputFile));
+    if (!CI.hasASTConsumer())
+      return false;
+
+    FailureCleanup.release();
+    return true;
+  }
+
+  // Set up the file and source managers, if needed.
+  if (!CI.hasFileManager()) {
+    if (!CI.createFileManager()) {
+      return false;
+    }
+  }
+  if (!CI.hasSourceManager())
+    CI.createSourceManager(CI.getFileManager());
+
+  // Set up embedding for any specified files. Do this before we load any
+  // source files, including the primary module map for the compilation.
+  for (const auto &F : CI.getFrontendOpts().ModulesEmbedFiles) {
+    if (auto FE = CI.getFileManager().getFile(F, /*openFile*/true))
+      CI.getSourceManager().setFileIsTransient(*FE);
+    else
+      CI.getDiagnostics().Report(diag::err_modules_embed_file_not_found) << F;
+  }
+  if (CI.getFrontendOpts().ModulesEmbedAllFiles)
+    CI.getSourceManager().setAllFilesAreTransient(true);
+
+  // IR files bypass the rest of initialization.
+  if (Input.getKind().getLanguage() == Language::LLVM_IR) {
+    assert(hasIRSupport() &&
+           "This action does not have IR file support!");
+
+    // Inform the diagnostic client we are processing a source file.
+    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
+    HasBegunSourceFile = true;
+
+    // Initialize the action.
+    if (!BeginSourceFileAction(CI))
+      return false;
+
+    // Initialize the main file entry.
+    if (!CI.InitializeSourceManager(CurrentInput))
+      return false;
+
+    FailureCleanup.release();
+    return true;
+  }
+
+  // If the implicit PCH include is actually a directory, rather than
+  // a single file, search for a suitable PCH file in that directory.
+  if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
+    FileManager &FileMgr = CI.getFileManager();
+    PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
+    StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
+    std::string SpecificModuleCachePath = CI.getSpecificModuleCachePath();
+    if (auto PCHDir = FileMgr.getDirectory(PCHInclude)) {
+      std::error_code EC;
+      SmallString<128> DirNative;
+      llvm::sys::path::native((*PCHDir)->getName(), DirNative);
+      bool Found = false;
+      llvm::vfs::FileSystem &FS = FileMgr.getVirtualFileSystem();
+      for (llvm::vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC),
+                                         DirEnd;
+           Dir != DirEnd && !EC; Dir.increment(EC)) {
+        // Check whether this is an acceptable AST file.
+        if (ASTReader::isAcceptableASTFile(
+                Dir->path(), FileMgr, CI.getPCHContainerReader(),
+                CI.getLangOpts(), CI.getTargetOpts(), CI.getPreprocessorOpts(),
+                SpecificModuleCachePath)) {
+          PPOpts.ImplicitPCHInclude = std::string(Dir->path());
+          Found = true;
+          break;
+        }
+      }
+
+      if (!Found) {
+        CI.getDiagnostics().Report(diag::err_fe_no_pch_in_dir) << PCHInclude;
+        return false;
+      }
+    }
+  }
+
+  // Set up the preprocessor if needed. When parsing model files the
+  // preprocessor of the original source is reused.
+  if (!isModelParsingAction())
+    CI.createPreprocessor(getTranslationUnitKind());
+
+  // Inform the diagnostic client we are processing a source file.
+  CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
+                                           &CI.getPreprocessor());
+  HasBegunSourceFile = true;
+
+  // Initialize the main file entry.
+  if (!CI.InitializeSourceManager(Input))
+    return false;
+
+  // For module map files, we first parse the module map and synthesize a
+  // "<module-includes>" buffer before more conventional processing.
+  if (Input.getKind().getFormat() == InputKind::ModuleMap) {
+    CI.getLangOpts().setCompilingModule(LangOptions::CMK_ModuleMap);
+
+    std::string PresumedModuleMapFile;
+    unsigned OffsetToContents;
+    if (loadModuleMapForModuleBuild(CI, Input.isSystem(),
+                                    Input.isPreprocessed(),
+                                    PresumedModuleMapFile, OffsetToContents))
+      return false;
+
+    auto *CurrentModule = prepareToBuildModule(CI, Input.getFile());
+    if (!CurrentModule)
+      return false;
+
+    CurrentModule->PresumedModuleMapFile = PresumedModuleMapFile;
+
+    if (OffsetToContents)
+      // If the module contents are in the same file, skip to them.
+      CI.getPreprocessor().setSkipMainFilePreamble(OffsetToContents, true);
+    else {
+      // Otherwise, convert the module description to a suitable input buffer.
+      auto Buffer = getInputBufferForModule(CI, CurrentModule);
+      if (!Buffer)
+        return false;
+
+      // Reinitialize the main file entry to refer to the new input.
+      auto Kind = CurrentModule->IsSystem ? SrcMgr::C_System : SrcMgr::C_User;
+      auto &SourceMgr = CI.getSourceManager();
+      auto BufferID = SourceMgr.createFileID(std::move(Buffer), Kind);
+      assert(BufferID.isValid() && "couldn't create module buffer ID");
+      SourceMgr.setMainFileID(BufferID);
+    }
+  }
+
+  // Initialize the action.
+  if (!BeginSourceFileAction(CI))
+    return false;
+
+  // If we were asked to load any module map files, do so now.
+  for (const auto &Filename : CI.getFrontendOpts().ModuleMapFiles) {
+    if (auto File = CI.getFileManager().getFile(Filename))
+      CI.getPreprocessor().getHeaderSearchInfo().loadModuleMapFile(
+          *File, /*IsSystem*/false);
+    else
+      CI.getDiagnostics().Report(diag::err_module_map_not_found) << Filename;
+  }
+
+  // Add a module declaration scope so that modules from -fmodule-map-file
+  // arguments may shadow modules found implicitly in search paths.
+  CI.getPreprocessor()
+      .getHeaderSearchInfo()
+      .getModuleMap()
+      .finishModuleDeclarationScope();
+
+  // Create the AST context and consumer unless this is a preprocessor only
+  // action.
+  if (!usesPreprocessorOnly()) {
+    // Parsing a model file should reuse the existing ASTContext.
+    if (!isModelParsingAction())
+      CI.createASTContext();
+
+    // For preprocessed files, check if the first line specifies the original
+    // source file name with a linemarker.
+    std::string PresumedInputFile = std::string(getCurrentFileOrBufferName());
+    if (Input.isPreprocessed())
+      ReadOriginalFileName(CI, PresumedInputFile);
+
+    std::unique_ptr<ASTConsumer> Consumer =
+        CreateWrappedASTConsumer(CI, PresumedInputFile);
+    if (!Consumer)
+      return false;
+
+    // FIXME: should not overwrite ASTMutationListener when parsing model files?
+    if (!isModelParsingAction())
+      CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());
+
+    if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) {
+      // Convert headers to PCH and chain them.
+      IntrusiveRefCntPtr<ExternalSemaSource> source, FinalReader;
+      source = createChainedIncludesSource(CI, FinalReader);
+      if (!source)
+        return false;
+      CI.setASTReader(static_cast<ASTReader *>(FinalReader.get()));
+      CI.getASTContext().setExternalSource(source);
+    } else if (CI.getLangOpts().Modules ||
+               !CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
+      // Use PCM or PCH.
+      assert(hasPCHSupport() && "This action does not have PCH support!");
+      ASTDeserializationListener *DeserialListener =
+          Consumer->GetASTDeserializationListener();
+      bool DeleteDeserialListener = false;
+      if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls) {
+        DeserialListener = new DeserializedDeclsDumper(DeserialListener,
+                                                       DeleteDeserialListener);
+        DeleteDeserialListener = true;
+      }
+      if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty()) {
+        DeserialListener = new DeserializedDeclsChecker(
+            CI.getASTContext(),
+            CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
+            DeserialListener, DeleteDeserialListener);
+        DeleteDeserialListener = true;
+      }
+      if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
+        CI.createPCHExternalASTSource(
+            CI.getPreprocessorOpts().ImplicitPCHInclude,
+            CI.getPreprocessorOpts().DisablePCHOrModuleValidation,
+            CI.getPreprocessorOpts().AllowPCHWithCompilerErrors,
+            DeserialListener, DeleteDeserialListener);
+        if (!CI.getASTContext().getExternalSource())
+          return false;
+      }
+      // If modules are enabled, create the AST reader before creating
+      // any builtins, so that all declarations know that they might be
+      // extended by an external source.
+      if (CI.getLangOpts().Modules || !CI.hasASTContext() ||
+          !CI.getASTContext().getExternalSource()) {
+        CI.createASTReader();
+        CI.getASTReader()->setDeserializationListener(DeserialListener,
+                                                      DeleteDeserialListener);
+      }
+    }
+
+    CI.setASTConsumer(std::move(Consumer));
+    if (!CI.hasASTConsumer())
+      return false;
+  }
+
+  // Initialize built-in info as long as we aren't using an external AST
+  // source.
+  if (CI.getLangOpts().Modules || !CI.hasASTContext() ||
+      !CI.getASTContext().getExternalSource()) {
+    Preprocessor &PP = CI.getPreprocessor();
+    PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
+                                           PP.getLangOpts());
+  } else {
+    // FIXME: If this is a problem, recover from it by creating a multiplex
+    // source.
+    assert((!CI.getLangOpts().Modules || CI.getASTReader()) &&
+           "modules enabled but created an external source that "
+           "doesn't support modules");
+  }
+
+  // If we were asked to load any module files, do so now.
+  for (const auto &ModuleFile : CI.getFrontendOpts().ModuleFiles)
+    if (!CI.loadModuleFile(ModuleFile))
+      return false;
+
+  // If there is a layout overrides file, attach an external AST source that
+  // provides the layouts from that file.
+  if (!CI.getFrontendOpts().OverrideRecordLayoutsFile.empty() &&
+      CI.hasASTContext() && !CI.getASTContext().getExternalSource()) {
+    IntrusiveRefCntPtr<ExternalASTSource>
+      Override(new LayoutOverrideSource(
+                     CI.getFrontendOpts().OverrideRecordLayoutsFile));
+    CI.getASTContext().setExternalSource(Override);
+  }
+
+  FailureCleanup.release();
+  return true;
+}
+
+llvm::Error FrontendAction::Execute() {
+  CompilerInstance &CI = getCompilerInstance();
+
+  if (CI.hasFrontendTimer()) {
+    llvm::TimeRegion Timer(CI.getFrontendTimer());
+    ExecuteAction();
+  }
+  else ExecuteAction();
+
+  // If we are supposed to rebuild the global module index, do so now unless
+  // there were any module-build failures.
+  if (CI.shouldBuildGlobalModuleIndex() && CI.hasFileManager() &&
+      CI.hasPreprocessor()) {
+    StringRef Cache =
+        CI.getPreprocessor().getHeaderSearchInfo().getModuleCachePath();
+    if (!Cache.empty()) {
+      if (llvm::Error Err = GlobalModuleIndex::writeIndex(
+              CI.getFileManager(), CI.getPCHContainerReader(), Cache)) {
+        // FIXME this drops the error on the floor, but
+        // Index/pch-from-libclang.c seems to rely on dropping at least some of
+        // the error conditions!
+        consumeError(std::move(Err));
+      }
+    }
+  }
+
+  return llvm::Error::success();
+}
+
+void FrontendAction::EndSourceFile() {
+  CompilerInstance &CI = getCompilerInstance();
+
+  // Inform the diagnostic client we are done with this source file.
+  CI.getDiagnosticClient().EndSourceFile();
+
+  // Inform the preprocessor we are done.
+  if (CI.hasPreprocessor())
+    CI.getPreprocessor().EndSourceFile();
+
+  // Finalize the action.
+  EndSourceFileAction();
+
+  // Sema references the ast consumer, so reset sema first.
+  //
+  // FIXME: There is more per-file stuff we could just drop here?
+  bool DisableFree = CI.getFrontendOpts().DisableFree;
+  if (DisableFree) {
+    CI.resetAndLeakSema();
+    CI.resetAndLeakASTContext();
+    llvm::BuryPointer(CI.takeASTConsumer().get());
+  } else {
+    CI.setSema(nullptr);
+    CI.setASTContext(nullptr);
+    CI.setASTConsumer(nullptr);
+  }
+
+  if (CI.getFrontendOpts().ShowStats) {
+    llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n";
+    CI.getPreprocessor().PrintStats();
+    CI.getPreprocessor().getIdentifierTable().PrintStats();
+    CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
+    CI.getSourceManager().PrintStats();
+    llvm::errs() << "\n";
+  }
+
+  // Cleanup the output streams, and erase the output files if instructed by the
+  // FrontendAction.
+  CI.clearOutputFiles(/*EraseFiles=*/shouldEraseOutputFiles());
+
+  if (isCurrentFileAST()) {
+    if (DisableFree) {
+      CI.resetAndLeakPreprocessor();
+      CI.resetAndLeakSourceManager();
+      CI.resetAndLeakFileManager();
+      llvm::BuryPointer(std::move(CurrentASTUnit));
+    } else {
+      CI.setPreprocessor(nullptr);
+      CI.setSourceManager(nullptr);
+      CI.setFileManager(nullptr);
+    }
+  }
+
+  setCompilerInstance(nullptr);
+  setCurrentInput(FrontendInputFile());
+  CI.getLangOpts().setCompilingModule(LangOptions::CMK_None);
+}
+
+bool FrontendAction::shouldEraseOutputFiles() {
+  return getCompilerInstance().getDiagnostics().hasErrorOccurred();
+}
+
+//===----------------------------------------------------------------------===//
+// Utility Actions
+//===----------------------------------------------------------------------===//
+
+void ASTFrontendAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  if (!CI.hasPreprocessor())
+    return;
+
+  // FIXME: Move the truncation aspect of this into Sema, we delayed this till
+  // here so the source manager would be initialized.
+  if (hasCodeCompletionSupport() &&
+      !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
+    CI.createCodeCompletionConsumer();
+
+  // Use a code completion consumer?
+  CodeCompleteConsumer *CompletionConsumer = nullptr;
+  if (CI.hasCodeCompletionConsumer())
+    CompletionConsumer = &CI.getCodeCompletionConsumer();
+
+  if (!CI.hasSema())
+    CI.createSema(getTranslationUnitKind(), CompletionConsumer);
+
+  ParseAST(CI.getSema(), CI.getFrontendOpts().ShowStats,
+           CI.getFrontendOpts().SkipFunctionBodies);
+}
+
+void PluginASTAction::anchor() { }
+
+std::unique_ptr<ASTConsumer>
+PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
+                                              StringRef InFile) {
+  llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
+}
+
+bool WrapperFrontendAction::PrepareToExecuteAction(CompilerInstance &CI) {
+  return WrappedAction->PrepareToExecuteAction(CI);
+}
+std::unique_ptr<ASTConsumer>
+WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
+                                         StringRef InFile) {
+  return WrappedAction->CreateASTConsumer(CI, InFile);
+}
+bool WrapperFrontendAction::BeginInvocation(CompilerInstance &CI) {
+  return WrappedAction->BeginInvocation(CI);
+}
+bool WrapperFrontendAction::BeginSourceFileAction(CompilerInstance &CI) {
+  WrappedAction->setCurrentInput(getCurrentInput());
+  WrappedAction->setCompilerInstance(&CI);
+  auto Ret = WrappedAction->BeginSourceFileAction(CI);
+  // BeginSourceFileAction may change CurrentInput, e.g. during module builds.
+  setCurrentInput(WrappedAction->getCurrentInput());
+  return Ret;
+}
+void WrapperFrontendAction::ExecuteAction() {
+  WrappedAction->ExecuteAction();
+}
+void WrapperFrontendAction::EndSourceFile() { WrappedAction->EndSourceFile(); }
+void WrapperFrontendAction::EndSourceFileAction() {
+  WrappedAction->EndSourceFileAction();
+}
+bool WrapperFrontendAction::shouldEraseOutputFiles() {
+  return WrappedAction->shouldEraseOutputFiles();
+}
+
+bool WrapperFrontendAction::usesPreprocessorOnly() const {
+  return WrappedAction->usesPreprocessorOnly();
+}
+TranslationUnitKind WrapperFrontendAction::getTranslationUnitKind() {
+  return WrappedAction->getTranslationUnitKind();
+}
+bool WrapperFrontendAction::hasPCHSupport() const {
+  return WrappedAction->hasPCHSupport();
+}
+bool WrapperFrontendAction::hasASTFileSupport() const {
+  return WrappedAction->hasASTFileSupport();
+}
+bool WrapperFrontendAction::hasIRSupport() const {
+  return WrappedAction->hasIRSupport();
+}
+bool WrapperFrontendAction::hasCodeCompletionSupport() const {
+  return WrappedAction->hasCodeCompletionSupport();
+}
+
+WrapperFrontendAction::WrapperFrontendAction(
+    std::unique_ptr<FrontendAction> WrappedAction)
+  : WrappedAction(std::move(WrappedAction)) {}
+
diff --git a/contrib/libs/clang14/lib/Frontend/FrontendActions.cpp b/contrib/libs/clang14/lib/Frontend/FrontendActions.cpp
new file mode 100644
index 0000000000..ad2e603947
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/FrontendActions.cpp
@@ -0,0 +1,1077 @@
+//===--- FrontendActions.cpp ----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/Decl.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Frontend/ASTConsumers.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/DependencyDirectivesSourceMinimizer.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Sema/TemplateInstCallback.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "llvm/Support/raw_ostream.h"
+#include <memory>
+#include <system_error>
+
+using namespace clang;
+
+namespace {
+CodeCompleteConsumer *GetCodeCompletionConsumer(CompilerInstance &CI) {
+  return CI.hasCodeCompletionConsumer() ? &CI.getCodeCompletionConsumer()
+                                        : nullptr;
+}
+
+void EnsureSemaIsCreated(CompilerInstance &CI, FrontendAction &Action) {
+  if (Action.hasCodeCompletionSupport() &&
+      !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
+    CI.createCodeCompletionConsumer();
+
+  if (!CI.hasSema())
+    CI.createSema(Action.getTranslationUnitKind(),
+                  GetCodeCompletionConsumer(CI));
+}
+} // namespace
+
+//===----------------------------------------------------------------------===//
+// Custom Actions
+//===----------------------------------------------------------------------===//
+
+std::unique_ptr<ASTConsumer>
+InitOnlyAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+void InitOnlyAction::ExecuteAction() {
+}
+
+// Basically PreprocessOnlyAction::ExecuteAction.
+void ReadPCHAndPreprocessAction::ExecuteAction() {
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
+
+  // Ignore unknown pragmas.
+  PP.IgnorePragmas();
+
+  Token Tok;
+  // Start parsing the specified input file.
+  PP.EnterMainSourceFile();
+  do {
+    PP.Lex(Tok);
+  } while (Tok.isNot(tok::eof));
+}
+
+std::unique_ptr<ASTConsumer>
+ReadPCHAndPreprocessAction::CreateASTConsumer(CompilerInstance &CI,
+                                              StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+//===----------------------------------------------------------------------===//
+// AST Consumer Actions
+//===----------------------------------------------------------------------===//
+
+std::unique_ptr<ASTConsumer>
+ASTPrintAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  if (std::unique_ptr<raw_ostream> OS =
+          CI.createDefaultOutputFile(false, InFile))
+    return CreateASTPrinter(std::move(OS), CI.getFrontendOpts().ASTDumpFilter);
+  return nullptr;
+}
+
+std::unique_ptr<ASTConsumer>
+ASTDumpAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  const FrontendOptions &Opts = CI.getFrontendOpts();
+  return CreateASTDumper(nullptr /*Dump to stdout.*/, Opts.ASTDumpFilter,
+                         Opts.ASTDumpDecls, Opts.ASTDumpAll,
+                         Opts.ASTDumpLookups, Opts.ASTDumpDeclTypes,
+                         Opts.ASTDumpFormat);
+}
+
+std::unique_ptr<ASTConsumer>
+ASTDeclListAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return CreateASTDeclNodeLister();
+}
+
+std::unique_ptr<ASTConsumer>
+ASTViewAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return CreateASTViewer();
+}
+
+std::unique_ptr<ASTConsumer>
+GeneratePCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  std::string Sysroot;
+  if (!ComputeASTConsumerArguments(CI, /*ref*/ Sysroot))
+    return nullptr;
+
+  std::string OutputFile;
+  std::unique_ptr<raw_pwrite_stream> OS =
+      CreateOutputFile(CI, InFile, /*ref*/ OutputFile);
+  if (!OS)
+    return nullptr;
+
+  if (!CI.getFrontendOpts().RelocatablePCH)
+    Sysroot.clear();
+
+  const auto &FrontendOpts = CI.getFrontendOpts();
+  auto Buffer = std::make_shared<PCHBuffer>();
+  std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+  Consumers.push_back(std::make_unique<PCHGenerator>(
+      CI.getPreprocessor(), CI.getModuleCache(), OutputFile, Sysroot, Buffer,
+      FrontendOpts.ModuleFileExtensions,
+      CI.getPreprocessorOpts().AllowPCHWithCompilerErrors,
+      FrontendOpts.IncludeTimestamps, +CI.getLangOpts().CacheGeneratedPCH));
+  Consumers.push_back(CI.getPCHContainerWriter().CreatePCHContainerGenerator(
+      CI, std::string(InFile), OutputFile, std::move(OS), Buffer));
+
+  return std::make_unique<MultiplexConsumer>(std::move(Consumers));
+}
+
+bool GeneratePCHAction::ComputeASTConsumerArguments(CompilerInstance &CI,
+                                                    std::string &Sysroot) {
+  Sysroot = CI.getHeaderSearchOpts().Sysroot;
+  if (CI.getFrontendOpts().RelocatablePCH && Sysroot.empty()) {
+    CI.getDiagnostics().Report(diag::err_relocatable_without_isysroot);
+    return false;
+  }
+
+  return true;
+}
+
+std::unique_ptr<llvm::raw_pwrite_stream>
+GeneratePCHAction::CreateOutputFile(CompilerInstance &CI, StringRef InFile,
+                                    std::string &OutputFile) {
+  // Because this is exposed via libclang we must disable RemoveFileOnSignal.
+  std::unique_ptr<raw_pwrite_stream> OS = CI.createDefaultOutputFile(
+      /*Binary=*/true, InFile, /*Extension=*/"", /*RemoveFileOnSignal=*/false);
+  if (!OS)
+    return nullptr;
+
+  OutputFile = CI.getFrontendOpts().OutputFile;
+  return OS;
+}
+
+bool GeneratePCHAction::shouldEraseOutputFiles() {
+  if (getCompilerInstance().getPreprocessorOpts().AllowPCHWithCompilerErrors)
+    return false;
+  return ASTFrontendAction::shouldEraseOutputFiles();
+}
+
+bool GeneratePCHAction::BeginSourceFileAction(CompilerInstance &CI) {
+  CI.getLangOpts().CompilingPCH = true;
+  return true;
+}
+
+std::unique_ptr<ASTConsumer>
+GenerateModuleAction::CreateASTConsumer(CompilerInstance &CI,
+                                        StringRef InFile) {
+  std::unique_ptr<raw_pwrite_stream> OS = CreateOutputFile(CI, InFile);
+  if (!OS)
+    return nullptr;
+
+  std::string OutputFile = CI.getFrontendOpts().OutputFile;
+  std::string Sysroot;
+
+  auto Buffer = std::make_shared<PCHBuffer>();
+  std::vector<std::unique_ptr<ASTConsumer>> Consumers;
+
+  Consumers.push_back(std::make_unique<PCHGenerator>(
+      CI.getPreprocessor(), CI.getModuleCache(), OutputFile, Sysroot, Buffer,
+      CI.getFrontendOpts().ModuleFileExtensions,
+      /*AllowASTWithErrors=*/
+      +CI.getFrontendOpts().AllowPCMWithCompilerErrors,
+      /*IncludeTimestamps=*/
+      +CI.getFrontendOpts().BuildingImplicitModule,
+      /*ShouldCacheASTInMemory=*/
+      +CI.getFrontendOpts().BuildingImplicitModule));
+  Consumers.push_back(CI.getPCHContainerWriter().CreatePCHContainerGenerator(
+      CI, std::string(InFile), OutputFile, std::move(OS), Buffer));
+  return std::make_unique<MultiplexConsumer>(std::move(Consumers));
+}
+
+bool GenerateModuleAction::shouldEraseOutputFiles() {
+  return !getCompilerInstance().getFrontendOpts().AllowPCMWithCompilerErrors &&
+         ASTFrontendAction::shouldEraseOutputFiles();
+}
+
+bool GenerateModuleFromModuleMapAction::BeginSourceFileAction(
+    CompilerInstance &CI) {
+  if (!CI.getLangOpts().Modules) {
+    CI.getDiagnostics().Report(diag::err_module_build_requires_fmodules);
+    return false;
+  }
+
+  return GenerateModuleAction::BeginSourceFileAction(CI);
+}
+
+std::unique_ptr<raw_pwrite_stream>
+GenerateModuleFromModuleMapAction::CreateOutputFile(CompilerInstance &CI,
+                                                    StringRef InFile) {
+  // If no output file was provided, figure out where this module would go
+  // in the module cache.
+  if (CI.getFrontendOpts().OutputFile.empty()) {
+    StringRef ModuleMapFile = CI.getFrontendOpts().OriginalModuleMap;
+    if (ModuleMapFile.empty())
+      ModuleMapFile = InFile;
+
+    HeaderSearch &HS = CI.getPreprocessor().getHeaderSearchInfo();
+    CI.getFrontendOpts().OutputFile =
+        HS.getCachedModuleFileName(CI.getLangOpts().CurrentModule,
+                                   ModuleMapFile);
+  }
+
+  // Because this is exposed via libclang we must disable RemoveFileOnSignal.
+  return CI.createDefaultOutputFile(/*Binary=*/true, InFile, /*Extension=*/"",
+                                    /*RemoveFileOnSignal=*/false,
+                                    /*CreateMissingDirectories=*/true,
+                                    /*ForceUseTemporary=*/true);
+}
+
+bool GenerateModuleInterfaceAction::BeginSourceFileAction(
+    CompilerInstance &CI) {
+  if (!CI.getLangOpts().ModulesTS && !CI.getLangOpts().CPlusPlusModules) {
+    CI.getDiagnostics().Report(diag::err_module_interface_requires_cpp_modules);
+    return false;
+  }
+
+  CI.getLangOpts().setCompilingModule(LangOptions::CMK_ModuleInterface);
+
+  return GenerateModuleAction::BeginSourceFileAction(CI);
+}
+
+std::unique_ptr<raw_pwrite_stream>
+GenerateModuleInterfaceAction::CreateOutputFile(CompilerInstance &CI,
+                                                StringRef InFile) {
+  return CI.createDefaultOutputFile(/*Binary=*/true, InFile, "pcm");
+}
+
+bool GenerateHeaderModuleAction::PrepareToExecuteAction(
+    CompilerInstance &CI) {
+  if (!CI.getLangOpts().Modules) {
+    CI.getDiagnostics().Report(diag::err_header_module_requires_modules);
+    return false;
+  }
+
+  auto &Inputs = CI.getFrontendOpts().Inputs;
+  if (Inputs.empty())
+    return GenerateModuleAction::BeginInvocation(CI);
+
+  auto Kind = Inputs[0].getKind();
+
+  // Convert the header file inputs into a single module input buffer.
+  SmallString<256> HeaderContents;
+  ModuleHeaders.reserve(Inputs.size());
+  for (const FrontendInputFile &FIF : Inputs) {
+    // FIXME: We should support re-compiling from an AST file.
+    if (FIF.getKind().getFormat() != InputKind::Source || !FIF.isFile()) {
+      CI.getDiagnostics().Report(diag::err_module_header_file_not_found)
+          << (FIF.isFile() ? FIF.getFile()
+                           : FIF.getBuffer().getBufferIdentifier());
+      return true;
+    }
+
+    HeaderContents += "#include \"";
+    HeaderContents += FIF.getFile();
+    HeaderContents += "\"\n";
+    ModuleHeaders.push_back(std::string(FIF.getFile()));
+  }
+  Buffer = llvm::MemoryBuffer::getMemBufferCopy(
+      HeaderContents, Module::getModuleInputBufferName());
+
+  // Set that buffer up as our "real" input.
+  Inputs.clear();
+  Inputs.push_back(
+      FrontendInputFile(Buffer->getMemBufferRef(), Kind, /*IsSystem*/ false));
+
+  return GenerateModuleAction::PrepareToExecuteAction(CI);
+}
+
+bool GenerateHeaderModuleAction::BeginSourceFileAction(
+    CompilerInstance &CI) {
+  CI.getLangOpts().setCompilingModule(LangOptions::CMK_HeaderModule);
+
+  // Synthesize a Module object for the given headers.
+  auto &HS = CI.getPreprocessor().getHeaderSearchInfo();
+  SmallVector<Module::Header, 16> Headers;
+  for (StringRef Name : ModuleHeaders) {
+    Optional<FileEntryRef> FE = HS.LookupFile(
+        Name, SourceLocation(), /*Angled*/ false, nullptr, nullptr, None,
+        nullptr, nullptr, nullptr, nullptr, nullptr, nullptr);
+    if (!FE) {
+      CI.getDiagnostics().Report(diag::err_module_header_file_not_found)
+        << Name;
+      continue;
+    }
+    Headers.push_back(
+        {std::string(Name), std::string(Name), &FE->getFileEntry()});
+  }
+  HS.getModuleMap().createHeaderModule(CI.getLangOpts().CurrentModule, Headers);
+
+  return GenerateModuleAction::BeginSourceFileAction(CI);
+}
+
+std::unique_ptr<raw_pwrite_stream>
+GenerateHeaderModuleAction::CreateOutputFile(CompilerInstance &CI,
+                                             StringRef InFile) {
+  return CI.createDefaultOutputFile(/*Binary=*/true, InFile, "pcm");
+}
+
+SyntaxOnlyAction::~SyntaxOnlyAction() {
+}
+
+std::unique_ptr<ASTConsumer>
+SyntaxOnlyAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+std::unique_ptr<ASTConsumer>
+DumpModuleInfoAction::CreateASTConsumer(CompilerInstance &CI,
+                                        StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+std::unique_ptr<ASTConsumer>
+VerifyPCHAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+void VerifyPCHAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  bool Preamble = CI.getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
+  const std::string &Sysroot = CI.getHeaderSearchOpts().Sysroot;
+  std::unique_ptr<ASTReader> Reader(new ASTReader(
+      CI.getPreprocessor(), CI.getModuleCache(), &CI.getASTContext(),
+      CI.getPCHContainerReader(), CI.getFrontendOpts().ModuleFileExtensions,
+      Sysroot.empty() ? "" : Sysroot.c_str(),
+      DisableValidationForModuleKind::None,
+      /*AllowASTWithCompilerErrors*/ false,
+      /*AllowConfigurationMismatch*/ true,
+      /*ValidateSystemInputs*/ true));
+
+  Reader->ReadAST(getCurrentFile(),
+                  Preamble ? serialization::MK_Preamble
+                           : serialization::MK_PCH,
+                  SourceLocation(),
+                  ASTReader::ARR_ConfigurationMismatch);
+}
+
+namespace {
+struct TemplightEntry {
+  std::string Name;
+  std::string Kind;
+  std::string Event;
+  std::string DefinitionLocation;
+  std::string PointOfInstantiation;
+};
+} // namespace
+
+namespace llvm {
+namespace yaml {
+template <> struct MappingTraits<TemplightEntry> {
+  static void mapping(IO &io, TemplightEntry &fields) {
+    io.mapRequired("name", fields.Name);
+    io.mapRequired("kind", fields.Kind);
+    io.mapRequired("event", fields.Event);
+    io.mapRequired("orig", fields.DefinitionLocation);
+    io.mapRequired("poi", fields.PointOfInstantiation);
+  }
+};
+} // namespace yaml
+} // namespace llvm
+
+namespace {
+class DefaultTemplateInstCallback : public TemplateInstantiationCallback {
+  using CodeSynthesisContext = Sema::CodeSynthesisContext;
+
+public:
+  void initialize(const Sema &) override {}
+
+  void finalize(const Sema &) override {}
+
+  void atTemplateBegin(const Sema &TheSema,
+                       const CodeSynthesisContext &Inst) override {
+    displayTemplightEntry<true>(llvm::outs(), TheSema, Inst);
+  }
+
+  void atTemplateEnd(const Sema &TheSema,
+                     const CodeSynthesisContext &Inst) override {
+    displayTemplightEntry<false>(llvm::outs(), TheSema, Inst);
+  }
+
+private:
+  static std::string toString(CodeSynthesisContext::SynthesisKind Kind) {
+    switch (Kind) {
+    case CodeSynthesisContext::TemplateInstantiation:
+      return "TemplateInstantiation";
+    case CodeSynthesisContext::DefaultTemplateArgumentInstantiation:
+      return "DefaultTemplateArgumentInstantiation";
+    case CodeSynthesisContext::DefaultFunctionArgumentInstantiation:
+      return "DefaultFunctionArgumentInstantiation";
+    case CodeSynthesisContext::ExplicitTemplateArgumentSubstitution:
+      return "ExplicitTemplateArgumentSubstitution";
+    case CodeSynthesisContext::DeducedTemplateArgumentSubstitution:
+      return "DeducedTemplateArgumentSubstitution";
+    case CodeSynthesisContext::PriorTemplateArgumentSubstitution:
+      return "PriorTemplateArgumentSubstitution";
+    case CodeSynthesisContext::DefaultTemplateArgumentChecking:
+      return "DefaultTemplateArgumentChecking";
+    case CodeSynthesisContext::ExceptionSpecEvaluation:
+      return "ExceptionSpecEvaluation";
+    case CodeSynthesisContext::ExceptionSpecInstantiation:
+      return "ExceptionSpecInstantiation";
+    case CodeSynthesisContext::DeclaringSpecialMember:
+      return "DeclaringSpecialMember";
+    case CodeSynthesisContext::DeclaringImplicitEqualityComparison:
+      return "DeclaringImplicitEqualityComparison";
+    case CodeSynthesisContext::DefiningSynthesizedFunction:
+      return "DefiningSynthesizedFunction";
+    case CodeSynthesisContext::RewritingOperatorAsSpaceship:
+      return "RewritingOperatorAsSpaceship";
+    case CodeSynthesisContext::Memoization:
+      return "Memoization";
+    case CodeSynthesisContext::ConstraintsCheck:
+      return "ConstraintsCheck";
+    case CodeSynthesisContext::ConstraintSubstitution:
+      return "ConstraintSubstitution";
+    case CodeSynthesisContext::ConstraintNormalization:
+      return "ConstraintNormalization";
+    case CodeSynthesisContext::ParameterMappingSubstitution:
+      return "ParameterMappingSubstitution";
+    case CodeSynthesisContext::RequirementInstantiation:
+      return "RequirementInstantiation";
+    case CodeSynthesisContext::NestedRequirementConstraintsCheck:
+      return "NestedRequirementConstraintsCheck";
+    case CodeSynthesisContext::InitializingStructuredBinding:
+      return "InitializingStructuredBinding";
+    case CodeSynthesisContext::MarkingClassDllexported:
+      return "MarkingClassDllexported";
+    }
+    return "";
+  }
+
+  template <bool BeginInstantiation>
+  static void displayTemplightEntry(llvm::raw_ostream &Out, const Sema &TheSema,
+                                    const CodeSynthesisContext &Inst) {
+    std::string YAML;
+    {
+      llvm::raw_string_ostream OS(YAML);
+      llvm::yaml::Output YO(OS);
+      TemplightEntry Entry =
+          getTemplightEntry<BeginInstantiation>(TheSema, Inst);
+      llvm::yaml::EmptyContext Context;
+      llvm::yaml::yamlize(YO, Entry, true, Context);
+    }
+    Out << "---" << YAML << "\n";
+  }
+
+  static void printEntryName(const Sema &TheSema, const Decl *Entity,
+                             llvm::raw_string_ostream &OS) {
+    auto *NamedTemplate = cast<NamedDecl>(Entity);
+
+    PrintingPolicy Policy = TheSema.Context.getPrintingPolicy();
+    // FIXME: Also ask for FullyQualifiedNames?
+    Policy.SuppressDefaultTemplateArgs = false;
+    NamedTemplate->getNameForDiagnostic(OS, Policy, true);
+
+    if (!OS.str().empty())
+      return;
+
+    Decl *Ctx = Decl::castFromDeclContext(NamedTemplate->getDeclContext());
+    NamedDecl *NamedCtx = dyn_cast_or_null<NamedDecl>(Ctx);
+
+    if (const auto *Decl = dyn_cast<TagDecl>(NamedTemplate)) {
+      if (const auto *R = dyn_cast<RecordDecl>(Decl)) {
+        if (R->isLambda()) {
+          OS << "lambda at ";
+          Decl->getLocation().print(OS, TheSema.getSourceManager());
+          return;
+        }
+      }
+      OS << "unnamed " << Decl->getKindName();
+      return;
+    }
+
+    if (const auto *Decl = dyn_cast<ParmVarDecl>(NamedTemplate)) {
+      OS << "unnamed function parameter " << Decl->getFunctionScopeIndex()
+         << " ";
+      if (Decl->getFunctionScopeDepth() > 0)
+        OS << "(at depth " << Decl->getFunctionScopeDepth() << ") ";
+      OS << "of ";
+      NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
+      return;
+    }
+
+    if (const auto *Decl = dyn_cast<TemplateTypeParmDecl>(NamedTemplate)) {
+      if (const Type *Ty = Decl->getTypeForDecl()) {
+        if (const auto *TTPT = dyn_cast_or_null<TemplateTypeParmType>(Ty)) {
+          OS << "unnamed template type parameter " << TTPT->getIndex() << " ";
+          if (TTPT->getDepth() > 0)
+            OS << "(at depth " << TTPT->getDepth() << ") ";
+          OS << "of ";
+          NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
+          return;
+        }
+      }
+    }
+
+    if (const auto *Decl = dyn_cast<NonTypeTemplateParmDecl>(NamedTemplate)) {
+      OS << "unnamed template non-type parameter " << Decl->getIndex() << " ";
+      if (Decl->getDepth() > 0)
+        OS << "(at depth " << Decl->getDepth() << ") ";
+      OS << "of ";
+      NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
+      return;
+    }
+
+    if (const auto *Decl = dyn_cast<TemplateTemplateParmDecl>(NamedTemplate)) {
+      OS << "unnamed template template parameter " << Decl->getIndex() << " ";
+      if (Decl->getDepth() > 0)
+        OS << "(at depth " << Decl->getDepth() << ") ";
+      OS << "of ";
+      NamedCtx->getNameForDiagnostic(OS, TheSema.getLangOpts(), true);
+      return;
+    }
+
+    llvm_unreachable("Failed to retrieve a name for this entry!");
+    OS << "unnamed identifier";
+  }
+
+  template <bool BeginInstantiation>
+  static TemplightEntry getTemplightEntry(const Sema &TheSema,
+                                          const CodeSynthesisContext &Inst) {
+    TemplightEntry Entry;
+    Entry.Kind = toString(Inst.Kind);
+    Entry.Event = BeginInstantiation ? "Begin" : "End";
+    llvm::raw_string_ostream OS(Entry.Name);
+    printEntryName(TheSema, Inst.Entity, OS);
+    const PresumedLoc DefLoc =
+        TheSema.getSourceManager().getPresumedLoc(Inst.Entity->getLocation());
+    if (!DefLoc.isInvalid())
+      Entry.DefinitionLocation = std::string(DefLoc.getFilename()) + ":" +
+                                 std::to_string(DefLoc.getLine()) + ":" +
+                                 std::to_string(DefLoc.getColumn());
+    const PresumedLoc PoiLoc =
+        TheSema.getSourceManager().getPresumedLoc(Inst.PointOfInstantiation);
+    if (!PoiLoc.isInvalid()) {
+      Entry.PointOfInstantiation = std::string(PoiLoc.getFilename()) + ":" +
+                                   std::to_string(PoiLoc.getLine()) + ":" +
+                                   std::to_string(PoiLoc.getColumn());
+    }
+    return Entry;
+  }
+};
+} // namespace
+
+std::unique_ptr<ASTConsumer>
+TemplightDumpAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+void TemplightDumpAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+
+  // This part is normally done by ASTFrontEndAction, but needs to happen
+  // before Templight observers can be created
+  // FIXME: Move the truncation aspect of this into Sema, we delayed this till
+  // here so the source manager would be initialized.
+  EnsureSemaIsCreated(CI, *this);
+
+  CI.getSema().TemplateInstCallbacks.push_back(
+      std::make_unique<DefaultTemplateInstCallback>());
+  ASTFrontendAction::ExecuteAction();
+}
+
+namespace {
+  /// AST reader listener that dumps module information for a module
+  /// file.
+  class DumpModuleInfoListener : public ASTReaderListener {
+    llvm::raw_ostream &Out;
+
+  public:
+    DumpModuleInfoListener(llvm::raw_ostream &Out) : Out(Out) { }
+
+#define DUMP_BOOLEAN(Value, Text)                       \
+    Out.indent(4) << Text << ": " << (Value? "Yes" : "No") << "\n"
+
+    bool ReadFullVersionInformation(StringRef FullVersion) override {
+      Out.indent(2)
+        << "Generated by "
+        << (FullVersion == getClangFullRepositoryVersion()? "this"
+                                                          : "a different")
+        << " Clang: " << FullVersion << "\n";
+      return ASTReaderListener::ReadFullVersionInformation(FullVersion);
+    }
+
+    void ReadModuleName(StringRef ModuleName) override {
+      Out.indent(2) << "Module name: " << ModuleName << "\n";
+    }
+    void ReadModuleMapFile(StringRef ModuleMapPath) override {
+      Out.indent(2) << "Module map file: " << ModuleMapPath << "\n";
+    }
+
+    bool ReadLanguageOptions(const LangOptions &LangOpts, bool Complain,
+                             bool AllowCompatibleDifferences) override {
+      Out.indent(2) << "Language options:\n";
+#define LANGOPT(Name, Bits, Default, Description) \
+      DUMP_BOOLEAN(LangOpts.Name, Description);
+#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
+      Out.indent(4) << Description << ": "                   \
+                    << static_cast<unsigned>(LangOpts.get##Name()) << "\n";
+#define VALUE_LANGOPT(Name, Bits, Default, Description) \
+      Out.indent(4) << Description << ": " << LangOpts.Name << "\n";
+#define BENIGN_LANGOPT(Name, Bits, Default, Description)
+#define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
+#include "clang/Basic/LangOptions.def"
+
+      if (!LangOpts.ModuleFeatures.empty()) {
+        Out.indent(4) << "Module features:\n";
+        for (StringRef Feature : LangOpts.ModuleFeatures)
+          Out.indent(6) << Feature << "\n";
+      }
+
+      return false;
+    }
+
+    bool ReadTargetOptions(const TargetOptions &TargetOpts, bool Complain,
+                           bool AllowCompatibleDifferences) override {
+      Out.indent(2) << "Target options:\n";
+      Out.indent(4) << "  Triple: " << TargetOpts.Triple << "\n";
+      Out.indent(4) << "  CPU: " << TargetOpts.CPU << "\n";
+      Out.indent(4) << "  TuneCPU: " << TargetOpts.TuneCPU << "\n";
+      Out.indent(4) << "  ABI: " << TargetOpts.ABI << "\n";
+
+      if (!TargetOpts.FeaturesAsWritten.empty()) {
+        Out.indent(4) << "Target features:\n";
+        for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size();
+             I != N; ++I) {
+          Out.indent(6) << TargetOpts.FeaturesAsWritten[I] << "\n";
+        }
+      }
+
+      return false;
+    }
+
+    bool ReadDiagnosticOptions(IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts,
+                               bool Complain) override {
+      Out.indent(2) << "Diagnostic options:\n";
+#define DIAGOPT(Name, Bits, Default) DUMP_BOOLEAN(DiagOpts->Name, #Name);
+#define ENUM_DIAGOPT(Name, Type, Bits, Default) \
+      Out.indent(4) << #Name << ": " << DiagOpts->get##Name() << "\n";
+#define VALUE_DIAGOPT(Name, Bits, Default) \
+      Out.indent(4) << #Name << ": " << DiagOpts->Name << "\n";
+#include "clang/Basic/DiagnosticOptions.def"
+
+      Out.indent(4) << "Diagnostic flags:\n";
+      for (const std::string &Warning : DiagOpts->Warnings)
+        Out.indent(6) << "-W" << Warning << "\n";
+      for (const std::string &Remark : DiagOpts->Remarks)
+        Out.indent(6) << "-R" << Remark << "\n";
+
+      return false;
+    }
+
+    bool ReadHeaderSearchOptions(const HeaderSearchOptions &HSOpts,
+                                 StringRef SpecificModuleCachePath,
+                                 bool Complain) override {
+      Out.indent(2) << "Header search options:\n";
+      Out.indent(4) << "System root [-isysroot=]: '" << HSOpts.Sysroot << "'\n";
+      Out.indent(4) << "Resource dir [ -resource-dir=]: '" << HSOpts.ResourceDir << "'\n";
+      Out.indent(4) << "Module Cache: '" << SpecificModuleCachePath << "'\n";
+      DUMP_BOOLEAN(HSOpts.UseBuiltinIncludes,
+                   "Use builtin include directories [-nobuiltininc]");
+      DUMP_BOOLEAN(HSOpts.UseStandardSystemIncludes,
+                   "Use standard system include directories [-nostdinc]");
+      DUMP_BOOLEAN(HSOpts.UseStandardCXXIncludes,
+                   "Use standard C++ include directories [-nostdinc++]");
+      DUMP_BOOLEAN(HSOpts.UseLibcxx,
+                   "Use libc++ (rather than libstdc++) [-stdlib=]");
+      return false;
+    }
+
+    bool ReadPreprocessorOptions(const PreprocessorOptions &PPOpts,
+                                 bool Complain,
+                                 std::string &SuggestedPredefines) override {
+      Out.indent(2) << "Preprocessor options:\n";
+      DUMP_BOOLEAN(PPOpts.UsePredefines,
+                   "Uses compiler/target-specific predefines [-undef]");
+      DUMP_BOOLEAN(PPOpts.DetailedRecord,
+                   "Uses detailed preprocessing record (for indexing)");
+
+      if (!PPOpts.Macros.empty()) {
+        Out.indent(4) << "Predefined macros:\n";
+      }
+
+      for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
+             I = PPOpts.Macros.begin(), IEnd = PPOpts.Macros.end();
+           I != IEnd; ++I) {
+        Out.indent(6);
+        if (I->second)
+          Out << "-U";
+        else
+          Out << "-D";
+        Out << I->first << "\n";
+      }
+      return false;
+    }
+
+    /// Indicates that a particular module file extension has been read.
+    void readModuleFileExtension(
+           const ModuleFileExtensionMetadata &Metadata) override {
+      Out.indent(2) << "Module file extension '"
+                    << Metadata.BlockName << "' " << Metadata.MajorVersion
+                    << "." << Metadata.MinorVersion;
+      if (!Metadata.UserInfo.empty()) {
+        Out << ": ";
+        Out.write_escaped(Metadata.UserInfo);
+      }
+
+      Out << "\n";
+    }
+
+    /// Tells the \c ASTReaderListener that we want to receive the
+    /// input files of the AST file via \c visitInputFile.
+    bool needsInputFileVisitation() override { return true; }
+
+    /// Tells the \c ASTReaderListener that we want to receive the
+    /// input files of the AST file via \c visitInputFile.
+    bool needsSystemInputFileVisitation() override { return true; }
+
+    /// Indicates that the AST file contains particular input file.
+    ///
+    /// \returns true to continue receiving the next input file, false to stop.
+    bool visitInputFile(StringRef Filename, bool isSystem,
+                        bool isOverridden, bool isExplicitModule) override {
+
+      Out.indent(2) << "Input file: " << Filename;
+
+      if (isSystem || isOverridden || isExplicitModule) {
+        Out << " [";
+        if (isSystem) {
+          Out << "System";
+          if (isOverridden || isExplicitModule)
+            Out << ", ";
+        }
+        if (isOverridden) {
+          Out << "Overridden";
+          if (isExplicitModule)
+            Out << ", ";
+        }
+        if (isExplicitModule)
+          Out << "ExplicitModule";
+
+        Out << "]";
+      }
+
+      Out << "\n";
+
+      return true;
+    }
+
+    /// Returns true if this \c ASTReaderListener wants to receive the
+    /// imports of the AST file via \c visitImport, false otherwise.
+    bool needsImportVisitation() const override { return true; }
+
+    /// If needsImportVisitation returns \c true, this is called for each
+    /// AST file imported by this AST file.
+    void visitImport(StringRef ModuleName, StringRef Filename) override {
+      Out.indent(2) << "Imports module '" << ModuleName
+                    << "': " << Filename.str() << "\n";
+    }
+#undef DUMP_BOOLEAN
+  };
+}
+
+bool DumpModuleInfoAction::BeginInvocation(CompilerInstance &CI) {
+  // The Object file reader also supports raw ast files and there is no point in
+  // being strict about the module file format in -module-file-info mode.
+  CI.getHeaderSearchOpts().ModuleFormat = "obj";
+  return true;
+}
+
+void DumpModuleInfoAction::ExecuteAction() {
+  // Set up the output file.
+  std::unique_ptr<llvm::raw_fd_ostream> OutFile;
+  StringRef OutputFileName = getCompilerInstance().getFrontendOpts().OutputFile;
+  if (!OutputFileName.empty() && OutputFileName != "-") {
+    std::error_code EC;
+    OutFile.reset(new llvm::raw_fd_ostream(OutputFileName.str(), EC,
+                                           llvm::sys::fs::OF_TextWithCRLF));
+  }
+  llvm::raw_ostream &Out = OutFile.get()? *OutFile.get() : llvm::outs();
+
+  Out << "Information for module file '" << getCurrentFile() << "':\n";
+  auto &FileMgr = getCompilerInstance().getFileManager();
+  auto Buffer = FileMgr.getBufferForFile(getCurrentFile());
+  StringRef Magic = (*Buffer)->getMemBufferRef().getBuffer();
+  bool IsRaw = (Magic.size() >= 4 && Magic[0] == 'C' && Magic[1] == 'P' &&
+                Magic[2] == 'C' && Magic[3] == 'H');
+  Out << "  Module format: " << (IsRaw ? "raw" : "obj") << "\n";
+
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
+  DumpModuleInfoListener Listener(Out);
+  HeaderSearchOptions &HSOpts =
+      PP.getHeaderSearchInfo().getHeaderSearchOpts();
+  ASTReader::readASTFileControlBlock(
+      getCurrentFile(), FileMgr, getCompilerInstance().getPCHContainerReader(),
+      /*FindModuleFileExtensions=*/true, Listener,
+      HSOpts.ModulesValidateDiagnosticOptions);
+}
+
+//===----------------------------------------------------------------------===//
+// Preprocessor Actions
+//===----------------------------------------------------------------------===//
+
+void DumpRawTokensAction::ExecuteAction() {
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
+  SourceManager &SM = PP.getSourceManager();
+
+  // Start lexing the specified input file.
+  llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
+  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOpts());
+  RawLex.SetKeepWhitespaceMode(true);
+
+  Token RawTok;
+  RawLex.LexFromRawLexer(RawTok);
+  while (RawTok.isNot(tok::eof)) {
+    PP.DumpToken(RawTok, true);
+    llvm::errs() << "\n";
+    RawLex.LexFromRawLexer(RawTok);
+  }
+}
+
+void DumpTokensAction::ExecuteAction() {
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
+  // Start preprocessing the specified input file.
+  Token Tok;
+  PP.EnterMainSourceFile();
+  do {
+    PP.Lex(Tok);
+    PP.DumpToken(Tok, true);
+    llvm::errs() << "\n";
+  } while (Tok.isNot(tok::eof));
+}
+
+void PreprocessOnlyAction::ExecuteAction() {
+  Preprocessor &PP = getCompilerInstance().getPreprocessor();
+
+  // Ignore unknown pragmas.
+  PP.IgnorePragmas();
+
+  Token Tok;
+  // Start parsing the specified input file.
+  PP.EnterMainSourceFile();
+  do {
+    PP.Lex(Tok);
+  } while (Tok.isNot(tok::eof));
+}
+
+void PrintPreprocessedAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  // Output file may need to be set to 'Binary', to avoid converting Unix style
+  // line feeds (<LF>) to Microsoft style line feeds (<CR><LF>) on Windows.
+  //
+  // Look to see what type of line endings the file uses. If there's a
+  // CRLF, then we won't open the file up in binary mode. If there is
+  // just an LF or CR, then we will open the file up in binary mode.
+  // In this fashion, the output format should match the input format, unless
+  // the input format has inconsistent line endings.
+  //
+  // This should be a relatively fast operation since most files won't have
+  // all of their source code on a single line. However, that is still a
+  // concern, so if we scan for too long, we'll just assume the file should
+  // be opened in binary mode.
+
+  bool BinaryMode = false;
+  if (llvm::Triple(LLVM_HOST_TRIPLE).isOSWindows()) {
+    BinaryMode = true;
+    const SourceManager &SM = CI.getSourceManager();
+    if (llvm::Optional<llvm::MemoryBufferRef> Buffer =
+            SM.getBufferOrNone(SM.getMainFileID())) {
+      const char *cur = Buffer->getBufferStart();
+      const char *end = Buffer->getBufferEnd();
+      const char *next = (cur != end) ? cur + 1 : end;
+
+      // Limit ourselves to only scanning 256 characters into the source
+      // file.  This is mostly a check in case the file has no
+      // newlines whatsoever.
+      if (end - cur > 256)
+        end = cur + 256;
+
+      while (next < end) {
+        if (*cur == 0x0D) {  // CR
+          if (*next == 0x0A) // CRLF
+            BinaryMode = false;
+
+          break;
+        } else if (*cur == 0x0A) // LF
+          break;
+
+        ++cur;
+        ++next;
+      }
+    }
+  }
+
+  std::unique_ptr<raw_ostream> OS =
+      CI.createDefaultOutputFile(BinaryMode, getCurrentFileOrBufferName());
+  if (!OS) return;
+
+  // If we're preprocessing a module map, start by dumping the contents of the
+  // module itself before switching to the input buffer.
+  auto &Input = getCurrentInput();
+  if (Input.getKind().getFormat() == InputKind::ModuleMap) {
+    if (Input.isFile()) {
+      (*OS) << "# 1 \"";
+      OS->write_escaped(Input.getFile());
+      (*OS) << "\"\n";
+    }
+    getCurrentModule()->print(*OS);
+    (*OS) << "#pragma clang module contents\n";
+  }
+
+  DoPrintPreprocessedInput(CI.getPreprocessor(), OS.get(),
+                           CI.getPreprocessorOutputOpts());
+}
+
+void PrintPreambleAction::ExecuteAction() {
+  switch (getCurrentFileKind().getLanguage()) {
+  case Language::C:
+  case Language::CXX:
+  case Language::ObjC:
+  case Language::ObjCXX:
+  case Language::OpenCL:
+  case Language::OpenCLCXX:
+  case Language::CUDA:
+  case Language::HIP:
+    break;
+
+  case Language::Unknown:
+  case Language::Asm:
+  case Language::LLVM_IR:
+  case Language::RenderScript:
+    // We can't do anything with these.
+    return;
+  }
+
+  // We don't expect to find any #include directives in a preprocessed input.
+  if (getCurrentFileKind().isPreprocessed())
+    return;
+
+  CompilerInstance &CI = getCompilerInstance();
+  auto Buffer = CI.getFileManager().getBufferForFile(getCurrentFile());
+  if (Buffer) {
+    unsigned Preamble =
+        Lexer::ComputePreamble((*Buffer)->getBuffer(), CI.getLangOpts()).Size;
+    llvm::outs().write((*Buffer)->getBufferStart(), Preamble);
+  }
+}
+
+void DumpCompilerOptionsAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  std::unique_ptr<raw_ostream> OSP =
+      CI.createDefaultOutputFile(false, getCurrentFile());
+  if (!OSP)
+    return;
+
+  raw_ostream &OS = *OSP;
+  const Preprocessor &PP = CI.getPreprocessor();
+  const LangOptions &LangOpts = PP.getLangOpts();
+
+  // FIXME: Rather than manually format the JSON (which is awkward due to
+  // needing to remove trailing commas), this should make use of a JSON library.
+  // FIXME: Instead of printing enums as an integral value and specifying the
+  // type as a separate field, use introspection to print the enumerator.
+
+  OS << "{\n";
+  OS << "\n\"features\" : [\n";
+  {
+    llvm::SmallString<128> Str;
+#define FEATURE(Name, Predicate)                                               \
+  ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
+      .toVector(Str);
+#include "clang/Basic/Features.def"
+#undef FEATURE
+    // Remove the newline and comma from the last entry to ensure this remains
+    // valid JSON.
+    OS << Str.substr(0, Str.size() - 2);
+  }
+  OS << "\n],\n";
+
+  OS << "\n\"extensions\" : [\n";
+  {
+    llvm::SmallString<128> Str;
+#define EXTENSION(Name, Predicate)                                             \
+  ("\t{\"" #Name "\" : " + llvm::Twine(Predicate ? "true" : "false") + "},\n") \
+      .toVector(Str);
+#include "clang/Basic/Features.def"
+#undef EXTENSION
+    // Remove the newline and comma from the last entry to ensure this remains
+    // valid JSON.
+    OS << Str.substr(0, Str.size() - 2);
+  }
+  OS << "\n]\n";
+
+  OS << "}";
+}
+
+void PrintDependencyDirectivesSourceMinimizerAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  SourceManager &SM = CI.getPreprocessor().getSourceManager();
+  llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
+
+  llvm::SmallString<1024> Output;
+  llvm::SmallVector<minimize_source_to_dependency_directives::Token, 32> Toks;
+  if (minimizeSourceToDependencyDirectives(
+          FromFile.getBuffer(), Output, Toks, &CI.getDiagnostics(),
+          SM.getLocForStartOfFile(SM.getMainFileID()))) {
+    assert(CI.getDiagnostics().hasErrorOccurred() &&
+           "no errors reported for failure");
+
+    // Preprocess the source when verifying the diagnostics to capture the
+    // 'expected' comments.
+    if (CI.getDiagnosticOpts().VerifyDiagnostics) {
+      // Make sure we don't emit new diagnostics!
+      CI.getDiagnostics().setSuppressAllDiagnostics(true);
+      Preprocessor &PP = getCompilerInstance().getPreprocessor();
+      PP.EnterMainSourceFile();
+      Token Tok;
+      do {
+        PP.Lex(Tok);
+      } while (Tok.isNot(tok::eof));
+    }
+    return;
+  }
+  llvm::outs() << Output;
+}
+
+void GetDependenciesByModuleNameAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  Preprocessor &PP = CI.getPreprocessor();
+  SourceManager &SM = PP.getSourceManager();
+  FileID MainFileID = SM.getMainFileID();
+  SourceLocation FileStart = SM.getLocForStartOfFile(MainFileID);
+  SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
+  IdentifierInfo *ModuleID = PP.getIdentifierInfo(ModuleName);
+  Path.push_back(std::make_pair(ModuleID, FileStart));
+  auto ModResult = CI.loadModule(FileStart, Path, Module::Hidden, false);
+  PPCallbacks *CB = PP.getPPCallbacks();
+  CB->moduleImport(SourceLocation(), Path, ModResult);
+}
diff --git a/contrib/libs/clang14/lib/Frontend/FrontendOptions.cpp b/contrib/libs/clang14/lib/Frontend/FrontendOptions.cpp
new file mode 100644
index 0000000000..37ac428a80
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/FrontendOptions.cpp
@@ -0,0 +1,37 @@
+//===- FrontendOptions.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/FrontendOptions.h"
+#include "clang/Basic/LangStandard.h"
+#include "llvm/ADT/StringSwitch.h"
+
+using namespace clang;
+
+InputKind FrontendOptions::getInputKindForExtension(StringRef Extension) {
+  return llvm::StringSwitch<InputKind>(Extension)
+      .Cases("ast", "pcm", InputKind(Language::Unknown, InputKind::Precompiled))
+      .Case("c", Language::C)
+      .Cases("S", "s", Language::Asm)
+      .Case("i", InputKind(Language::C).getPreprocessed())
+      .Case("ii", InputKind(Language::CXX).getPreprocessed())
+      .Case("cui", InputKind(Language::CUDA).getPreprocessed())
+      .Case("m", Language::ObjC)
+      .Case("mi", InputKind(Language::ObjC).getPreprocessed())
+      .Cases("mm", "M", Language::ObjCXX)
+      .Case("mii", InputKind(Language::ObjCXX).getPreprocessed())
+      .Cases("C", "cc", "cp", Language::CXX)
+      .Cases("cpp", "CPP", "c++", "cxx", "hpp", "hxx", Language::CXX)
+      .Case("cppm", Language::CXX)
+      .Case("iim", InputKind(Language::CXX).getPreprocessed())
+      .Case("cl", Language::OpenCL)
+      .Case("clcpp", Language::OpenCLCXX)
+      .Cases("cu", "cuh", Language::CUDA)
+      .Case("hip", Language::HIP)
+      .Cases("ll", "bc", Language::LLVM_IR)
+      .Default(Language::Unknown);
+}
diff --git a/contrib/libs/clang14/lib/Frontend/HeaderIncludeGen.cpp b/contrib/libs/clang14/lib/Frontend/HeaderIncludeGen.cpp
new file mode 100644
index 0000000000..5db8792bf4
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/HeaderIncludeGen.cpp
@@ -0,0 +1,199 @@
+//===-- HeaderIncludeGen.cpp - Generate Header Includes -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/DependencyOutputOptions.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Lex/Preprocessor.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+namespace {
+class HeaderIncludesCallback : public PPCallbacks {
+  SourceManager &SM;
+  raw_ostream *OutputFile;
+  const DependencyOutputOptions &DepOpts;
+  unsigned CurrentIncludeDepth;
+  bool HasProcessedPredefines;
+  bool OwnsOutputFile;
+  bool ShowAllHeaders;
+  bool ShowDepth;
+  bool MSStyle;
+
+public:
+  HeaderIncludesCallback(const Preprocessor *PP, bool ShowAllHeaders_,
+                         raw_ostream *OutputFile_,
+                         const DependencyOutputOptions &DepOpts,
+                         bool OwnsOutputFile_, bool ShowDepth_, bool MSStyle_)
+      : SM(PP->getSourceManager()), OutputFile(OutputFile_), DepOpts(DepOpts),
+        CurrentIncludeDepth(0), HasProcessedPredefines(false),
+        OwnsOutputFile(OwnsOutputFile_), ShowAllHeaders(ShowAllHeaders_),
+        ShowDepth(ShowDepth_), MSStyle(MSStyle_) {}
+
+  ~HeaderIncludesCallback() override {
+    if (OwnsOutputFile)
+      delete OutputFile;
+  }
+
+  void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                   SrcMgr::CharacteristicKind FileType,
+                   FileID PrevFID) override;
+
+  void FileSkipped(const FileEntryRef &SkippedFile, const Token &FilenameTok,
+                   SrcMgr::CharacteristicKind FileType) override;
+};
+}
+
+static void PrintHeaderInfo(raw_ostream *OutputFile, StringRef Filename,
+                            bool ShowDepth, unsigned CurrentIncludeDepth,
+                            bool MSStyle) {
+  // Write to a temporary string to avoid unnecessary flushing on errs().
+  SmallString<512> Pathname(Filename);
+  if (!MSStyle)
+    Lexer::Stringify(Pathname);
+
+  SmallString<256> Msg;
+  if (MSStyle)
+    Msg += "Note: including file:";
+
+  if (ShowDepth) {
+    // The main source file is at depth 1, so skip one dot.
+    for (unsigned i = 1; i != CurrentIncludeDepth; ++i)
+      Msg += MSStyle ? ' ' : '.';
+
+    if (!MSStyle)
+      Msg += ' ';
+  }
+  Msg += Pathname;
+  Msg += '\n';
+
+  *OutputFile << Msg;
+  OutputFile->flush();
+}
+
+void clang::AttachHeaderIncludeGen(Preprocessor &PP,
+                                   const DependencyOutputOptions &DepOpts,
+                                   bool ShowAllHeaders, StringRef OutputPath,
+                                   bool ShowDepth, bool MSStyle) {
+  raw_ostream *OutputFile = &llvm::errs();
+  bool OwnsOutputFile = false;
+
+  // Choose output stream, when printing in cl.exe /showIncludes style.
+  if (MSStyle) {
+    switch (DepOpts.ShowIncludesDest) {
+    default:
+      llvm_unreachable("Invalid destination for /showIncludes output!");
+    case ShowIncludesDestination::Stderr:
+      OutputFile = &llvm::errs();
+      break;
+    case ShowIncludesDestination::Stdout:
+      OutputFile = &llvm::outs();
+      break;
+    }
+  }
+
+  // Open the output file, if used.
+  if (!OutputPath.empty()) {
+    std::error_code EC;
+    llvm::raw_fd_ostream *OS = new llvm::raw_fd_ostream(
+        OutputPath.str(), EC,
+        llvm::sys::fs::OF_Append | llvm::sys::fs::OF_TextWithCRLF);
+    if (EC) {
+      PP.getDiagnostics().Report(clang::diag::warn_fe_cc_print_header_failure)
+          << EC.message();
+      delete OS;
+    } else {
+      OS->SetUnbuffered();
+      OutputFile = OS;
+      OwnsOutputFile = true;
+    }
+  }
+
+  // Print header info for extra headers, pretending they were discovered by
+  // the regular preprocessor. The primary use case is to support proper
+  // generation of Make / Ninja file dependencies for implicit includes, such
+  // as sanitizer ignorelists. It's only important for cl.exe compatibility,
+  // the GNU way to generate rules is -M / -MM / -MD / -MMD.
+  for (const auto &Header : DepOpts.ExtraDeps)
+    PrintHeaderInfo(OutputFile, Header.first, ShowDepth, 2, MSStyle);
+  PP.addPPCallbacks(std::make_unique<HeaderIncludesCallback>(
+      &PP, ShowAllHeaders, OutputFile, DepOpts, OwnsOutputFile, ShowDepth,
+      MSStyle));
+}
+
+void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
+                                         FileChangeReason Reason,
+                                         SrcMgr::CharacteristicKind NewFileType,
+                                         FileID PrevFID) {
+  // Unless we are exiting a #include, make sure to skip ahead to the line the
+  // #include directive was at.
+  PresumedLoc UserLoc = SM.getPresumedLoc(Loc);
+  if (UserLoc.isInvalid())
+    return;
+
+  // Adjust the current include depth.
+  if (Reason == PPCallbacks::EnterFile) {
+    ++CurrentIncludeDepth;
+  } else if (Reason == PPCallbacks::ExitFile) {
+    if (CurrentIncludeDepth)
+      --CurrentIncludeDepth;
+
+    // We track when we are done with the predefines by watching for the first
+    // place where we drop back to a nesting depth of 1.
+    if (CurrentIncludeDepth == 1 && !HasProcessedPredefines) {
+      if (!DepOpts.ShowIncludesPretendHeader.empty()) {
+        PrintHeaderInfo(OutputFile, DepOpts.ShowIncludesPretendHeader,
+                        ShowDepth, 2, MSStyle);
+      }
+      HasProcessedPredefines = true;
+    }
+
+    return;
+  } else
+    return;
+
+  // Show the header if we are (a) past the predefines, or (b) showing all
+  // headers and in the predefines at a depth past the initial file and command
+  // line buffers.
+  bool ShowHeader = (HasProcessedPredefines ||
+                     (ShowAllHeaders && CurrentIncludeDepth > 2));
+  unsigned IncludeDepth = CurrentIncludeDepth;
+  if (!HasProcessedPredefines)
+    --IncludeDepth; // Ignore indent from <built-in>.
+  else if (!DepOpts.ShowIncludesPretendHeader.empty())
+    ++IncludeDepth; // Pretend inclusion by ShowIncludesPretendHeader.
+
+  if (!DepOpts.IncludeSystemHeaders && isSystem(NewFileType))
+    ShowHeader = false;
+
+  // Dump the header include information we are past the predefines buffer or
+  // are showing all headers and this isn't the magic implicit <command line>
+  // header.
+  // FIXME: Identify headers in a more robust way than comparing their name to
+  // "<command line>" and "<built-in>" in a bunch of places.
+  if (ShowHeader && Reason == PPCallbacks::EnterFile &&
+      UserLoc.getFilename() != StringRef("<command line>")) {
+    PrintHeaderInfo(OutputFile, UserLoc.getFilename(), ShowDepth, IncludeDepth,
+                    MSStyle);
+  }
+}
+
+void HeaderIncludesCallback::FileSkipped(const FileEntryRef &SkippedFile, const
+                                         Token &FilenameTok,
+                                         SrcMgr::CharacteristicKind FileType) {
+  if (!DepOpts.ShowSkippedHeaderIncludes)
+    return;
+
+  if (!DepOpts.IncludeSystemHeaders && isSystem(FileType))
+    return;
+
+  PrintHeaderInfo(OutputFile, SkippedFile.getName(), ShowDepth,
+                  CurrentIncludeDepth + 1, MSStyle);
+}
diff --git a/contrib/libs/clang14/lib/Frontend/InitPreprocessor.cpp b/contrib/libs/clang14/lib/Frontend/InitPreprocessor.cpp
new file mode 100644
index 0000000000..e259ab47c5
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/InitPreprocessor.cpp
@@ -0,0 +1,1347 @@
+//===--- InitPreprocessor.cpp - PP initialization code. ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the clang::InitializePreprocessor function.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/MacroBuilder.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/SyncScope.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/Version.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/FrontendOptions.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Serialization/ASTReader.h"
+#include "llvm/ADT/APFloat.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+using namespace clang;
+
+static bool MacroBodyEndsInBackslash(StringRef MacroBody) {
+  while (!MacroBody.empty() && isWhitespace(MacroBody.back()))
+    MacroBody = MacroBody.drop_back();
+  return !MacroBody.empty() && MacroBody.back() == '\\';
+}
+
+// Append a #define line to Buf for Macro.  Macro should be of the form XXX,
+// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit
+// "#define XXX Y z W".  To get a #define with no value, use "XXX=".
+static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro,
+                               DiagnosticsEngine &Diags) {
+  std::pair<StringRef, StringRef> MacroPair = Macro.split('=');
+  StringRef MacroName = MacroPair.first;
+  StringRef MacroBody = MacroPair.second;
+  if (MacroName.size() != Macro.size()) {
+    // Per GCC -D semantics, the macro ends at \n if it exists.
+    StringRef::size_type End = MacroBody.find_first_of("\n\r");
+    if (End != StringRef::npos)
+      Diags.Report(diag::warn_fe_macro_contains_embedded_newline)
+        << MacroName;
+    MacroBody = MacroBody.substr(0, End);
+    // We handle macro bodies which end in a backslash by appending an extra
+    // backslash+newline.  This makes sure we don't accidentally treat the
+    // backslash as a line continuation marker.
+    if (MacroBodyEndsInBackslash(MacroBody))
+      Builder.defineMacro(MacroName, Twine(MacroBody) + "\\\n");
+    else
+      Builder.defineMacro(MacroName, MacroBody);
+  } else {
+    // Push "macroname 1".
+    Builder.defineMacro(Macro);
+  }
+}
+
+/// AddImplicitInclude - Add an implicit \#include of the specified file to the
+/// predefines buffer.
+/// As these includes are generated by -include arguments the header search
+/// logic is going to search relatively to the current working directory.
+static void AddImplicitInclude(MacroBuilder &Builder, StringRef File) {
+  Builder.append(Twine("#include \"") + File + "\"");
+}
+
+static void AddImplicitIncludeMacros(MacroBuilder &Builder, StringRef File) {
+  Builder.append(Twine("#__include_macros \"") + File + "\"");
+  // Marker token to stop the __include_macros fetch loop.
+  Builder.append("##"); // ##?
+}
+
+/// Add an implicit \#include using the original file used to generate
+/// a PCH file.
+static void AddImplicitIncludePCH(MacroBuilder &Builder, Preprocessor &PP,
+                                  const PCHContainerReader &PCHContainerRdr,
+                                  StringRef ImplicitIncludePCH) {
+  std::string OriginalFile = ASTReader::getOriginalSourceFile(
+      std::string(ImplicitIncludePCH), PP.getFileManager(), PCHContainerRdr,
+      PP.getDiagnostics());
+  if (OriginalFile.empty())
+    return;
+
+  AddImplicitInclude(Builder, OriginalFile);
+}
+
+/// PickFP - This is used to pick a value based on the FP semantics of the
+/// specified FP model.
+template <typename T>
+static T PickFP(const llvm::fltSemantics *Sem, T IEEEHalfVal, T IEEESingleVal,
+                T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal,
+                T IEEEQuadVal) {
+  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEhalf())
+    return IEEEHalfVal;
+  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle())
+    return IEEESingleVal;
+  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble())
+    return IEEEDoubleVal;
+  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended())
+    return X87DoubleExtendedVal;
+  if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble())
+    return PPCDoubleDoubleVal;
+  assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad());
+  return IEEEQuadVal;
+}
+
+static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix,
+                              const llvm::fltSemantics *Sem, StringRef Ext) {
+  const char *DenormMin, *Epsilon, *Max, *Min;
+  DenormMin = PickFP(Sem, "5.9604644775390625e-8", "1.40129846e-45",
+                     "4.9406564584124654e-324", "3.64519953188247460253e-4951",
+                     "4.94065645841246544176568792868221e-324",
+                     "6.47517511943802511092443895822764655e-4966");
+  int Digits = PickFP(Sem, 3, 6, 15, 18, 31, 33);
+  int DecimalDigits = PickFP(Sem, 5, 9, 17, 21, 33, 36);
+  Epsilon = PickFP(Sem, "9.765625e-4", "1.19209290e-7",
+                   "2.2204460492503131e-16", "1.08420217248550443401e-19",
+                   "4.94065645841246544176568792868221e-324",
+                   "1.92592994438723585305597794258492732e-34");
+  int MantissaDigits = PickFP(Sem, 11, 24, 53, 64, 106, 113);
+  int Min10Exp = PickFP(Sem, -4, -37, -307, -4931, -291, -4931);
+  int Max10Exp = PickFP(Sem, 4, 38, 308, 4932, 308, 4932);
+  int MinExp = PickFP(Sem, -13, -125, -1021, -16381, -968, -16381);
+  int MaxExp = PickFP(Sem, 16, 128, 1024, 16384, 1024, 16384);
+  Min = PickFP(Sem, "6.103515625e-5", "1.17549435e-38", "2.2250738585072014e-308",
+               "3.36210314311209350626e-4932",
+               "2.00416836000897277799610805135016e-292",
+               "3.36210314311209350626267781732175260e-4932");
+  Max = PickFP(Sem, "6.5504e+4", "3.40282347e+38", "1.7976931348623157e+308",
+               "1.18973149535723176502e+4932",
+               "1.79769313486231580793728971405301e+308",
+               "1.18973149535723176508575932662800702e+4932");
+
+  SmallString<32> DefPrefix;
+  DefPrefix = "__";
+  DefPrefix += Prefix;
+  DefPrefix += "_";
+
+  Builder.defineMacro(DefPrefix + "DENORM_MIN__", Twine(DenormMin)+Ext);
+  Builder.defineMacro(DefPrefix + "HAS_DENORM__");
+  Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits));
+  Builder.defineMacro(DefPrefix + "DECIMAL_DIG__", Twine(DecimalDigits));
+  Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)+Ext);
+  Builder.defineMacro(DefPrefix + "HAS_INFINITY__");
+  Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__");
+  Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits));
+
+  Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp));
+  Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp));
+  Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)+Ext);
+
+  Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")");
+  Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")");
+  Builder.defineMacro(DefPrefix + "MIN__", Twine(Min)+Ext);
+}
+
+
+/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro
+/// named MacroName with the max value for a type with width 'TypeWidth' a
+/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL).
+static void DefineTypeSize(const Twine &MacroName, unsigned TypeWidth,
+                           StringRef ValSuffix, bool isSigned,
+                           MacroBuilder &Builder) {
+  llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth)
+                                : llvm::APInt::getMaxValue(TypeWidth);
+  Builder.defineMacro(MacroName, toString(MaxVal, 10, isSigned) + ValSuffix);
+}
+
+/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine
+/// the width, suffix, and signedness of the given type
+static void DefineTypeSize(const Twine &MacroName, TargetInfo::IntType Ty,
+                           const TargetInfo &TI, MacroBuilder &Builder) {
+  DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty),
+                 TI.isTypeSigned(Ty), Builder);
+}
+
+static void DefineFmt(const Twine &Prefix, TargetInfo::IntType Ty,
+                      const TargetInfo &TI, MacroBuilder &Builder) {
+  bool IsSigned = TI.isTypeSigned(Ty);
+  StringRef FmtModifier = TI.getTypeFormatModifier(Ty);
+  for (const char *Fmt = IsSigned ? "di" : "ouxX"; *Fmt; ++Fmt) {
+    Builder.defineMacro(Prefix + "_FMT" + Twine(*Fmt) + "__",
+                        Twine("\"") + FmtModifier + Twine(*Fmt) + "\"");
+  }
+}
+
+static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty,
+                       MacroBuilder &Builder) {
+  Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty));
+}
+
+static void DefineTypeWidth(const Twine &MacroName, TargetInfo::IntType Ty,
+                            const TargetInfo &TI, MacroBuilder &Builder) {
+  Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty)));
+}
+
+static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth,
+                             const TargetInfo &TI, MacroBuilder &Builder) {
+  Builder.defineMacro(MacroName,
+                      Twine(BitWidth / TI.getCharWidth()));
+}
+
+// This will generate a macro based on the prefix with `_MAX__` as the suffix
+// for the max value representable for the type, and a macro with a `_WIDTH__`
+// suffix for the width of the type.
+static void DefineTypeSizeAndWidth(const Twine &Prefix, TargetInfo::IntType Ty,
+                                   const TargetInfo &TI,
+                                   MacroBuilder &Builder) {
+  DefineTypeSize(Prefix + "_MAX__", Ty, TI, Builder);
+  DefineTypeWidth(Prefix + "_WIDTH__", Ty, TI, Builder);
+}
+
+static void DefineExactWidthIntType(TargetInfo::IntType Ty,
+                                    const TargetInfo &TI,
+                                    MacroBuilder &Builder) {
+  int TypeWidth = TI.getTypeWidth(Ty);
+  bool IsSigned = TI.isTypeSigned(Ty);
+
+  // Use the target specified int64 type, when appropriate, so that [u]int64_t
+  // ends up being defined in terms of the correct type.
+  if (TypeWidth == 64)
+    Ty = IsSigned ? TI.getInt64Type() : TI.getUInt64Type();
+
+  // Use the target specified int16 type when appropriate. Some MCU targets
+  // (such as AVR) have definition of [u]int16_t to [un]signed int.
+  if (TypeWidth == 16)
+    Ty = IsSigned ? TI.getInt16Type() : TI.getUInt16Type();
+
+  const char *Prefix = IsSigned ? "__INT" : "__UINT";
+
+  DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
+  DefineFmt(Prefix + Twine(TypeWidth), Ty, TI, Builder);
+
+  StringRef ConstSuffix(TI.getTypeConstantSuffix(Ty));
+  Builder.defineMacro(Prefix + Twine(TypeWidth) + "_C_SUFFIX__", ConstSuffix);
+}
+
+static void DefineExactWidthIntTypeSize(TargetInfo::IntType Ty,
+                                        const TargetInfo &TI,
+                                        MacroBuilder &Builder) {
+  int TypeWidth = TI.getTypeWidth(Ty);
+  bool IsSigned = TI.isTypeSigned(Ty);
+
+  // Use the target specified int64 type, when appropriate, so that [u]int64_t
+  // ends up being defined in terms of the correct type.
+  if (TypeWidth == 64)
+    Ty = IsSigned ? TI.getInt64Type() : TI.getUInt64Type();
+
+  // We don't need to define a _WIDTH macro for the exact-width types because
+  // we already know the width.
+  const char *Prefix = IsSigned ? "__INT" : "__UINT";
+  DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
+}
+
+static void DefineLeastWidthIntType(unsigned TypeWidth, bool IsSigned,
+                                    const TargetInfo &TI,
+                                    MacroBuilder &Builder) {
+  TargetInfo::IntType Ty = TI.getLeastIntTypeByWidth(TypeWidth, IsSigned);
+  if (Ty == TargetInfo::NoInt)
+    return;
+
+  const char *Prefix = IsSigned ? "__INT_LEAST" : "__UINT_LEAST";
+  DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
+  // We only want the *_WIDTH macro for the signed types to avoid too many
+  // predefined macros (the unsigned width and the signed width are identical.)
+  if (IsSigned)
+    DefineTypeSizeAndWidth(Prefix + Twine(TypeWidth), Ty, TI, Builder);
+  else
+    DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
+  DefineFmt(Prefix + Twine(TypeWidth), Ty, TI, Builder);
+}
+
+static void DefineFastIntType(unsigned TypeWidth, bool IsSigned,
+                              const TargetInfo &TI, MacroBuilder &Builder) {
+  // stdint.h currently defines the fast int types as equivalent to the least
+  // types.
+  TargetInfo::IntType Ty = TI.getLeastIntTypeByWidth(TypeWidth, IsSigned);
+  if (Ty == TargetInfo::NoInt)
+    return;
+
+  const char *Prefix = IsSigned ? "__INT_FAST" : "__UINT_FAST";
+  DefineType(Prefix + Twine(TypeWidth) + "_TYPE__", Ty, Builder);
+  // We only want the *_WIDTH macro for the signed types to avoid too many
+  // predefined macros (the unsigned width and the signed width are identical.)
+  if (IsSigned)
+    DefineTypeSizeAndWidth(Prefix + Twine(TypeWidth), Ty, TI, Builder);
+  else
+    DefineTypeSize(Prefix + Twine(TypeWidth) + "_MAX__", Ty, TI, Builder);
+  DefineFmt(Prefix + Twine(TypeWidth), Ty, TI, Builder);
+}
+
+
+/// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with
+/// the specified properties.
+static const char *getLockFreeValue(unsigned TypeWidth, unsigned TypeAlign,
+                                    unsigned InlineWidth) {
+  // Fully-aligned, power-of-2 sizes no larger than the inline
+  // width will be inlined as lock-free operations.
+  if (TypeWidth == TypeAlign && (TypeWidth & (TypeWidth - 1)) == 0 &&
+      TypeWidth <= InlineWidth)
+    return "2"; // "always lock free"
+  // We cannot be certain what operations the lib calls might be
+  // able to implement as lock-free on future processors.
+  return "1"; // "sometimes lock free"
+}
+
+/// Add definitions required for a smooth interaction between
+/// Objective-C++ automated reference counting and libstdc++ (4.2).
+static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts,
+                                         MacroBuilder &Builder) {
+  Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR");
+
+  std::string Result;
+  {
+    // Provide specializations for the __is_scalar type trait so that
+    // lifetime-qualified objects are not considered "scalar" types, which
+    // libstdc++ uses as an indicator of the presence of trivial copy, assign,
+    // default-construct, and destruct semantics (none of which hold for
+    // lifetime-qualified objects in ARC).
+    llvm::raw_string_ostream Out(Result);
+
+    Out << "namespace std {\n"
+        << "\n"
+        << "struct __true_type;\n"
+        << "struct __false_type;\n"
+        << "\n";
+
+    Out << "template<typename _Tp> struct __is_scalar;\n"
+        << "\n";
+
+    if (LangOpts.ObjCAutoRefCount) {
+      Out << "template<typename _Tp>\n"
+          << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n"
+          << "  enum { __value = 0 };\n"
+          << "  typedef __false_type __type;\n"
+          << "};\n"
+          << "\n";
+    }
+
+    if (LangOpts.ObjCWeak) {
+      Out << "template<typename _Tp>\n"
+          << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n"
+          << "  enum { __value = 0 };\n"
+          << "  typedef __false_type __type;\n"
+          << "};\n"
+          << "\n";
+    }
+
+    if (LangOpts.ObjCAutoRefCount) {
+      Out << "template<typename _Tp>\n"
+          << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))"
+          << " _Tp> {\n"
+          << "  enum { __value = 0 };\n"
+          << "  typedef __false_type __type;\n"
+          << "};\n"
+          << "\n";
+    }
+
+    Out << "}\n";
+  }
+  Builder.append(Result);
+}
+
+static void InitializeStandardPredefinedMacros(const TargetInfo &TI,
+                                               const LangOptions &LangOpts,
+                                               const FrontendOptions &FEOpts,
+                                               MacroBuilder &Builder) {
+  // C++ [cpp.predefined]p1:
+  //   The following macro names shall be defined by the implementation:
+
+  //   -- __STDC__
+  //      [C++] Whether __STDC__ is predefined and if so, what its value is,
+  //      are implementation-defined.
+  // (Removed in C++20.)
+  if (!LangOpts.MSVCCompat && !LangOpts.TraditionalCPP)
+    Builder.defineMacro("__STDC__");
+  //   -- __STDC_HOSTED__
+  //      The integer literal 1 if the implementation is a hosted
+  //      implementation or the integer literal 0 if it is not.
+  if (LangOpts.Freestanding)
+    Builder.defineMacro("__STDC_HOSTED__", "0");
+  else
+    Builder.defineMacro("__STDC_HOSTED__");
+
+  //   -- __STDC_VERSION__
+  //      [C++] Whether __STDC_VERSION__ is predefined and if so, what its
+  //      value is, are implementation-defined.
+  // (Removed in C++20.)
+  if (!LangOpts.CPlusPlus) {
+    // FIXME: Use correct value for C23.
+    if (LangOpts.C2x)
+      Builder.defineMacro("__STDC_VERSION__", "202000L");
+    else if (LangOpts.C17)
+      Builder.defineMacro("__STDC_VERSION__", "201710L");
+    else if (LangOpts.C11)
+      Builder.defineMacro("__STDC_VERSION__", "201112L");
+    else if (LangOpts.C99)
+      Builder.defineMacro("__STDC_VERSION__", "199901L");
+    else if (!LangOpts.GNUMode && LangOpts.Digraphs)
+      Builder.defineMacro("__STDC_VERSION__", "199409L");
+  } else {
+    //   -- __cplusplus
+    // FIXME: Use correct value for C++23.
+    if (LangOpts.CPlusPlus2b)
+      Builder.defineMacro("__cplusplus", "202101L");
+    //      [C++20] The integer literal 202002L.
+    else if (LangOpts.CPlusPlus20)
+      Builder.defineMacro("__cplusplus", "202002L");
+    //      [C++17] The integer literal 201703L.
+    else if (LangOpts.CPlusPlus17)
+      Builder.defineMacro("__cplusplus", "201703L");
+    //      [C++14] The name __cplusplus is defined to the value 201402L when
+    //      compiling a C++ translation unit.
+    else if (LangOpts.CPlusPlus14)
+      Builder.defineMacro("__cplusplus", "201402L");
+    //      [C++11] The name __cplusplus is defined to the value 201103L when
+    //      compiling a C++ translation unit.
+    else if (LangOpts.CPlusPlus11)
+      Builder.defineMacro("__cplusplus", "201103L");
+    //      [C++03] The name __cplusplus is defined to the value 199711L when
+    //      compiling a C++ translation unit.
+    else
+      Builder.defineMacro("__cplusplus", "199711L");
+
+    //   -- __STDCPP_DEFAULT_NEW_ALIGNMENT__
+    //      [C++17] An integer literal of type std::size_t whose value is the
+    //      alignment guaranteed by a call to operator new(std::size_t)
+    //
+    // We provide this in all language modes, since it seems generally useful.
+    Builder.defineMacro("__STDCPP_DEFAULT_NEW_ALIGNMENT__",
+                        Twine(TI.getNewAlign() / TI.getCharWidth()) +
+                            TI.getTypeConstantSuffix(TI.getSizeType()));
+
+    //   -- __STDCPP_­THREADS__
+    //      Defined, and has the value integer literal 1, if and only if a
+    //      program can have more than one thread of execution.
+    if (LangOpts.getThreadModel() == LangOptions::ThreadModelKind::POSIX)
+      Builder.defineMacro("__STDCPP_THREADS__", "1");
+  }
+
+  // In C11 these are environment macros. In C++11 they are only defined
+  // as part of <cuchar>. To prevent breakage when mixing C and C++
+  // code, define these macros unconditionally. We can define them
+  // unconditionally, as Clang always uses UTF-16 and UTF-32 for 16-bit
+  // and 32-bit character literals.
+  Builder.defineMacro("__STDC_UTF_16__", "1");
+  Builder.defineMacro("__STDC_UTF_32__", "1");
+
+  if (LangOpts.ObjC)
+    Builder.defineMacro("__OBJC__");
+
+  // OpenCL v1.0/1.1 s6.9, v1.2/2.0 s6.10: Preprocessor Directives and Macros.
+  if (LangOpts.OpenCL) {
+    if (LangOpts.CPlusPlus) {
+      switch (LangOpts.OpenCLCPlusPlusVersion) {
+      case 100:
+        Builder.defineMacro("__OPENCL_CPP_VERSION__", "100");
+        break;
+      case 202100:
+        Builder.defineMacro("__OPENCL_CPP_VERSION__", "202100");
+        break;
+      default:
+        llvm_unreachable("Unsupported C++ version for OpenCL");
+      }
+      Builder.defineMacro("__CL_CPP_VERSION_1_0__", "100");
+      Builder.defineMacro("__CL_CPP_VERSION_2021__", "202100");
+    } else {
+      // OpenCL v1.0 and v1.1 do not have a predefined macro to indicate the
+      // language standard with which the program is compiled. __OPENCL_VERSION__
+      // is for the OpenCL version supported by the OpenCL device, which is not
+      // necessarily the language standard with which the program is compiled.
+      // A shared OpenCL header file requires a macro to indicate the language
+      // standard. As a workaround, __OPENCL_C_VERSION__ is defined for
+      // OpenCL v1.0 and v1.1.
+      switch (LangOpts.OpenCLVersion) {
+      case 100:
+        Builder.defineMacro("__OPENCL_C_VERSION__", "100");
+        break;
+      case 110:
+        Builder.defineMacro("__OPENCL_C_VERSION__", "110");
+        break;
+      case 120:
+        Builder.defineMacro("__OPENCL_C_VERSION__", "120");
+        break;
+      case 200:
+        Builder.defineMacro("__OPENCL_C_VERSION__", "200");
+        break;
+      case 300:
+        Builder.defineMacro("__OPENCL_C_VERSION__", "300");
+        break;
+      default:
+        llvm_unreachable("Unsupported OpenCL version");
+      }
+    }
+    Builder.defineMacro("CL_VERSION_1_0", "100");
+    Builder.defineMacro("CL_VERSION_1_1", "110");
+    Builder.defineMacro("CL_VERSION_1_2", "120");
+    Builder.defineMacro("CL_VERSION_2_0", "200");
+    Builder.defineMacro("CL_VERSION_3_0", "300");
+
+    if (TI.isLittleEndian())
+      Builder.defineMacro("__ENDIAN_LITTLE__");
+
+    if (LangOpts.FastRelaxedMath)
+      Builder.defineMacro("__FAST_RELAXED_MATH__");
+  }
+
+  if (LangOpts.SYCLIsDevice || LangOpts.SYCLIsHost) {
+    // SYCL Version is set to a value when building SYCL applications
+    if (LangOpts.getSYCLVersion() == LangOptions::SYCL_2017)
+      Builder.defineMacro("CL_SYCL_LANGUAGE_VERSION", "121");
+    else if (LangOpts.getSYCLVersion() == LangOptions::SYCL_2020)
+      Builder.defineMacro("SYCL_LANGUAGE_VERSION", "202001");
+  }
+
+  // Not "standard" per se, but available even with the -undef flag.
+  if (LangOpts.AsmPreprocessor)
+    Builder.defineMacro("__ASSEMBLER__");
+  if (LangOpts.CUDA) {
+    if (LangOpts.GPURelocatableDeviceCode)
+      Builder.defineMacro("__CLANG_RDC__");
+    if (!LangOpts.HIP)
+      Builder.defineMacro("__CUDA__");
+  }
+  if (LangOpts.HIP) {
+    Builder.defineMacro("__HIP__");
+    Builder.defineMacro("__HIPCC__");
+    Builder.defineMacro("__HIP_MEMORY_SCOPE_SINGLETHREAD", "1");
+    Builder.defineMacro("__HIP_MEMORY_SCOPE_WAVEFRONT", "2");
+    Builder.defineMacro("__HIP_MEMORY_SCOPE_WORKGROUP", "3");
+    Builder.defineMacro("__HIP_MEMORY_SCOPE_AGENT", "4");
+    Builder.defineMacro("__HIP_MEMORY_SCOPE_SYSTEM", "5");
+    if (LangOpts.CUDAIsDevice)
+      Builder.defineMacro("__HIP_DEVICE_COMPILE__");
+  }
+}
+
+/// Initialize the predefined C++ language feature test macros defined in
+/// ISO/IEC JTC1/SC22/WG21 (C++) SD-6: "SG10 Feature Test Recommendations".
+static void InitializeCPlusPlusFeatureTestMacros(const LangOptions &LangOpts,
+                                                 MacroBuilder &Builder) {
+  // C++98 features.
+  if (LangOpts.RTTI)
+    Builder.defineMacro("__cpp_rtti", "199711L");
+  if (LangOpts.CXXExceptions)
+    Builder.defineMacro("__cpp_exceptions", "199711L");
+
+  // C++11 features.
+  if (LangOpts.CPlusPlus11) {
+    Builder.defineMacro("__cpp_unicode_characters", "200704L");
+    Builder.defineMacro("__cpp_raw_strings", "200710L");
+    Builder.defineMacro("__cpp_unicode_literals", "200710L");
+    Builder.defineMacro("__cpp_user_defined_literals", "200809L");
+    Builder.defineMacro("__cpp_lambdas", "200907L");
+    Builder.defineMacro("__cpp_constexpr",
+                        LangOpts.CPlusPlus20 ? "201907L" :
+                        LangOpts.CPlusPlus17 ? "201603L" :
+                        LangOpts.CPlusPlus14 ? "201304L" : "200704");
+    Builder.defineMacro("__cpp_constexpr_in_decltype", "201711L");
+    Builder.defineMacro("__cpp_range_based_for",
+                        LangOpts.CPlusPlus17 ? "201603L" : "200907");
+    Builder.defineMacro("__cpp_static_assert",
+                        LangOpts.CPlusPlus17 ? "201411L" : "200410");
+    Builder.defineMacro("__cpp_decltype", "200707L");
+    Builder.defineMacro("__cpp_attributes", "200809L");
+    Builder.defineMacro("__cpp_rvalue_references", "200610L");
+    Builder.defineMacro("__cpp_variadic_templates", "200704L");
+    Builder.defineMacro("__cpp_initializer_lists", "200806L");
+    Builder.defineMacro("__cpp_delegating_constructors", "200604L");
+    Builder.defineMacro("__cpp_nsdmi", "200809L");
+    Builder.defineMacro("__cpp_inheriting_constructors", "201511L");
+    Builder.defineMacro("__cpp_ref_qualifiers", "200710L");
+    Builder.defineMacro("__cpp_alias_templates", "200704L");
+  }
+  if (LangOpts.ThreadsafeStatics)
+    Builder.defineMacro("__cpp_threadsafe_static_init", "200806L");
+
+  // C++14 features.
+  if (LangOpts.CPlusPlus14) {
+    Builder.defineMacro("__cpp_binary_literals", "201304L");
+    Builder.defineMacro("__cpp_digit_separators", "201309L");
+    Builder.defineMacro("__cpp_init_captures",
+                        LangOpts.CPlusPlus20 ? "201803L" : "201304L");
+    Builder.defineMacro("__cpp_generic_lambdas",
+                        LangOpts.CPlusPlus20 ? "201707L" : "201304L");
+    Builder.defineMacro("__cpp_decltype_auto", "201304L");
+    Builder.defineMacro("__cpp_return_type_deduction", "201304L");
+    Builder.defineMacro("__cpp_aggregate_nsdmi", "201304L");
+    Builder.defineMacro("__cpp_variable_templates", "201304L");
+  }
+  if (LangOpts.SizedDeallocation)
+    Builder.defineMacro("__cpp_sized_deallocation", "201309L");
+
+  // C++17 features.
+  if (LangOpts.CPlusPlus17) {
+    Builder.defineMacro("__cpp_hex_float", "201603L");
+    Builder.defineMacro("__cpp_inline_variables", "201606L");
+    Builder.defineMacro("__cpp_noexcept_function_type", "201510L");
+    Builder.defineMacro("__cpp_capture_star_this", "201603L");
+    Builder.defineMacro("__cpp_if_constexpr", "201606L");
+    Builder.defineMacro("__cpp_deduction_guides", "201703L"); // (not latest)
+    Builder.defineMacro("__cpp_template_auto", "201606L"); // (old name)
+    Builder.defineMacro("__cpp_namespace_attributes", "201411L");
+    Builder.defineMacro("__cpp_enumerator_attributes", "201411L");
+    Builder.defineMacro("__cpp_nested_namespace_definitions", "201411L");
+    Builder.defineMacro("__cpp_variadic_using", "201611L");
+    Builder.defineMacro("__cpp_aggregate_bases", "201603L");
+    Builder.defineMacro("__cpp_structured_bindings", "201606L");
+    Builder.defineMacro("__cpp_nontype_template_args",
+                        "201411L"); // (not latest)
+    Builder.defineMacro("__cpp_fold_expressions", "201603L");
+    Builder.defineMacro("__cpp_guaranteed_copy_elision", "201606L");
+    Builder.defineMacro("__cpp_nontype_template_parameter_auto", "201606L");
+  }
+  if (LangOpts.AlignedAllocation && !LangOpts.AlignedAllocationUnavailable)
+    Builder.defineMacro("__cpp_aligned_new", "201606L");
+  if (LangOpts.RelaxedTemplateTemplateArgs)
+    Builder.defineMacro("__cpp_template_template_args", "201611L");
+
+  // C++20 features.
+  if (LangOpts.CPlusPlus20) {
+    //Builder.defineMacro("__cpp_aggregate_paren_init", "201902L");
+    Builder.defineMacro("__cpp_concepts", "201907L");
+    Builder.defineMacro("__cpp_conditional_explicit", "201806L");
+    //Builder.defineMacro("__cpp_consteval", "201811L");
+    Builder.defineMacro("__cpp_constexpr_dynamic_alloc", "201907L");
+    Builder.defineMacro("__cpp_constinit", "201907L");
+    Builder.defineMacro("__cpp_impl_coroutine", "201902L");
+    Builder.defineMacro("__cpp_designated_initializers", "201707L");
+    Builder.defineMacro("__cpp_impl_three_way_comparison", "201907L");
+    //Builder.defineMacro("__cpp_modules", "201907L");
+    Builder.defineMacro("__cpp_using_enum", "201907L");
+  }
+  // C++2b features.
+  if (LangOpts.CPlusPlus2b) {
+    Builder.defineMacro("__cpp_implicit_move", "202011L");
+    Builder.defineMacro("__cpp_size_t_suffix", "202011L");
+    Builder.defineMacro("__cpp_if_consteval", "202106L");
+  }
+  if (LangOpts.Char8)
+    Builder.defineMacro("__cpp_char8_t", "201811L");
+  Builder.defineMacro("__cpp_impl_destroying_delete", "201806L");
+
+  // TS features.
+  if (LangOpts.Coroutines)
+    Builder.defineMacro("__cpp_coroutines", "201703L");
+}
+
+/// InitializeOpenCLFeatureTestMacros - Define OpenCL macros based on target
+/// settings and language version
+void InitializeOpenCLFeatureTestMacros(const TargetInfo &TI,
+                                       const LangOptions &Opts,
+                                       MacroBuilder &Builder) {
+  const llvm::StringMap<bool> &OpenCLFeaturesMap = TI.getSupportedOpenCLOpts();
+  // FIXME: OpenCL options which affect language semantics/syntax
+  // should be moved into LangOptions.
+  auto defineOpenCLExtMacro = [&](llvm::StringRef Name, auto... OptArgs) {
+    // Check if extension is supported by target and is available in this
+    // OpenCL version
+    if (TI.hasFeatureEnabled(OpenCLFeaturesMap, Name) &&
+        OpenCLOptions::isOpenCLOptionAvailableIn(Opts, OptArgs...))
+      Builder.defineMacro(Name);
+  };
+#define OPENCL_GENERIC_EXTENSION(Ext, ...)                                     \
+  defineOpenCLExtMacro(#Ext, __VA_ARGS__);
+#include "clang/Basic/OpenCLExtensions.def"
+
+  // Assume compiling for FULL profile
+  Builder.defineMacro("__opencl_c_int64");
+}
+
+static void InitializePredefinedMacros(const TargetInfo &TI,
+                                       const LangOptions &LangOpts,
+                                       const FrontendOptions &FEOpts,
+                                       const PreprocessorOptions &PPOpts,
+                                       MacroBuilder &Builder) {
+  // Compiler version introspection macros.
+  Builder.defineMacro("__llvm__");  // LLVM Backend
+  Builder.defineMacro("__clang__"); // Clang Frontend
+#define TOSTR2(X) #X
+#define TOSTR(X) TOSTR2(X)
+  Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR));
+  Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR));
+  Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL));
+#undef TOSTR
+#undef TOSTR2
+  Builder.defineMacro("__clang_version__",
+                      "\"" CLANG_VERSION_STRING " "
+                      + getClangFullRepositoryVersion() + "\"");
+
+  if (LangOpts.GNUCVersion != 0) {
+    // Major, minor, patch, are given two decimal places each, so 4.2.1 becomes
+    // 40201.
+    unsigned GNUCMajor = LangOpts.GNUCVersion / 100 / 100;
+    unsigned GNUCMinor = LangOpts.GNUCVersion / 100 % 100;
+    unsigned GNUCPatch = LangOpts.GNUCVersion % 100;
+    Builder.defineMacro("__GNUC__", Twine(GNUCMajor));
+    Builder.defineMacro("__GNUC_MINOR__", Twine(GNUCMinor));
+    Builder.defineMacro("__GNUC_PATCHLEVEL__", Twine(GNUCPatch));
+    Builder.defineMacro("__GXX_ABI_VERSION", "1002");
+
+    if (LangOpts.CPlusPlus) {
+      Builder.defineMacro("__GNUG__", Twine(GNUCMajor));
+      Builder.defineMacro("__GXX_WEAK__");
+    }
+  }
+
+  // Define macros for the C11 / C++11 memory orderings
+  Builder.defineMacro("__ATOMIC_RELAXED", "0");
+  Builder.defineMacro("__ATOMIC_CONSUME", "1");
+  Builder.defineMacro("__ATOMIC_ACQUIRE", "2");
+  Builder.defineMacro("__ATOMIC_RELEASE", "3");
+  Builder.defineMacro("__ATOMIC_ACQ_REL", "4");
+  Builder.defineMacro("__ATOMIC_SEQ_CST", "5");
+
+  // Define macros for the OpenCL memory scope.
+  // The values should match AtomicScopeOpenCLModel::ID enum.
+  static_assert(
+      static_cast<unsigned>(AtomicScopeOpenCLModel::WorkGroup) == 1 &&
+          static_cast<unsigned>(AtomicScopeOpenCLModel::Device) == 2 &&
+          static_cast<unsigned>(AtomicScopeOpenCLModel::AllSVMDevices) == 3 &&
+          static_cast<unsigned>(AtomicScopeOpenCLModel::SubGroup) == 4,
+      "Invalid OpenCL memory scope enum definition");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_WORK_ITEM", "0");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_WORK_GROUP", "1");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_DEVICE", "2");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES", "3");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_SUB_GROUP", "4");
+
+  // Support for #pragma redefine_extname (Sun compatibility)
+  Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1");
+
+  // Previously this macro was set to a string aiming to achieve compatibility
+  // with GCC 4.2.1. Now, just return the full Clang version
+  Builder.defineMacro("__VERSION__", "\"" +
+                      Twine(getClangFullCPPVersion()) + "\"");
+
+  // Initialize language-specific preprocessor defines.
+
+  // Standard conforming mode?
+  if (!LangOpts.GNUMode && !LangOpts.MSVCCompat)
+    Builder.defineMacro("__STRICT_ANSI__");
+
+  if (LangOpts.GNUCVersion && LangOpts.CPlusPlus11)
+    Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__");
+
+  if (LangOpts.ObjC) {
+    if (LangOpts.ObjCRuntime.isNonFragile()) {
+      Builder.defineMacro("__OBJC2__");
+
+      if (LangOpts.ObjCExceptions)
+        Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS");
+    }
+
+    if (LangOpts.getGC() != LangOptions::NonGC)
+      Builder.defineMacro("__OBJC_GC__");
+
+    if (LangOpts.ObjCRuntime.isNeXTFamily())
+      Builder.defineMacro("__NEXT_RUNTIME__");
+
+    if (LangOpts.ObjCRuntime.getKind() == ObjCRuntime::GNUstep) {
+      auto version = LangOpts.ObjCRuntime.getVersion();
+      std::string versionString = "1";
+      // Don't rely on the tuple argument, because we can be asked to target
+      // later ABIs than we actually support, so clamp these values to those
+      // currently supported
+      if (version >= VersionTuple(2, 0))
+        Builder.defineMacro("__OBJC_GNUSTEP_RUNTIME_ABI__", "20");
+      else
+        Builder.defineMacro("__OBJC_GNUSTEP_RUNTIME_ABI__",
+            "1" + Twine(std::min(8U, version.getMinor().getValueOr(0))));
+    }
+
+    if (LangOpts.ObjCRuntime.getKind() == ObjCRuntime::ObjFW) {
+      VersionTuple tuple = LangOpts.ObjCRuntime.getVersion();
+
+      unsigned minor = 0;
+      if (tuple.getMinor().hasValue())
+        minor = tuple.getMinor().getValue();
+
+      unsigned subminor = 0;
+      if (tuple.getSubminor().hasValue())
+        subminor = tuple.getSubminor().getValue();
+
+      Builder.defineMacro("__OBJFW_RUNTIME_ABI__",
+                          Twine(tuple.getMajor() * 10000 + minor * 100 +
+                                subminor));
+    }
+
+    Builder.defineMacro("IBOutlet", "__attribute__((iboutlet))");
+    Builder.defineMacro("IBOutletCollection(ClassName)",
+                        "__attribute__((iboutletcollection(ClassName)))");
+    Builder.defineMacro("IBAction", "void)__attribute__((ibaction)");
+    Builder.defineMacro("IBInspectable", "");
+    Builder.defineMacro("IB_DESIGNABLE", "");
+  }
+
+  // Define a macro that describes the Objective-C boolean type even for C
+  // and C++ since BOOL can be used from non Objective-C code.
+  Builder.defineMacro("__OBJC_BOOL_IS_BOOL",
+                      Twine(TI.useSignedCharForObjCBool() ? "0" : "1"));
+
+  if (LangOpts.CPlusPlus)
+    InitializeCPlusPlusFeatureTestMacros(LangOpts, Builder);
+
+  // darwin_constant_cfstrings controls this. This is also dependent
+  // on other things like the runtime I believe.  This is set even for C code.
+  if (!LangOpts.NoConstantCFStrings)
+      Builder.defineMacro("__CONSTANT_CFSTRINGS__");
+
+  if (LangOpts.ObjC)
+    Builder.defineMacro("OBJC_NEW_PROPERTIES");
+
+  if (LangOpts.PascalStrings)
+    Builder.defineMacro("__PASCAL_STRINGS__");
+
+  if (LangOpts.Blocks) {
+    Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))");
+    Builder.defineMacro("__BLOCKS__");
+  }
+
+  if (!LangOpts.MSVCCompat && LangOpts.Exceptions)
+    Builder.defineMacro("__EXCEPTIONS");
+  if (LangOpts.GNUCVersion && LangOpts.RTTI)
+    Builder.defineMacro("__GXX_RTTI");
+
+  if (LangOpts.hasSjLjExceptions())
+    Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__");
+  else if (LangOpts.hasSEHExceptions())
+    Builder.defineMacro("__SEH__");
+  else if (LangOpts.hasDWARFExceptions() &&
+           (TI.getTriple().isThumb() || TI.getTriple().isARM()))
+    Builder.defineMacro("__ARM_DWARF_EH__");
+
+  if (LangOpts.Deprecated)
+    Builder.defineMacro("__DEPRECATED");
+
+  if (!LangOpts.MSVCCompat && LangOpts.CPlusPlus)
+    Builder.defineMacro("__private_extern__", "extern");
+
+  if (LangOpts.MicrosoftExt) {
+    if (LangOpts.WChar) {
+      // wchar_t supported as a keyword.
+      Builder.defineMacro("_WCHAR_T_DEFINED");
+      Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED");
+    }
+  }
+
+  // Macros to help identify the narrow and wide character sets
+  // FIXME: clang currently ignores -fexec-charset=. If this changes,
+  // then this may need to be updated.
+  Builder.defineMacro("__clang_literal_encoding__", "\"UTF-8\"");
+  if (TI.getTypeWidth(TI.getWCharType()) >= 32) {
+    // FIXME: 32-bit wchar_t signals UTF-32. This may change
+    // if -fwide-exec-charset= is ever supported.
+    Builder.defineMacro("__clang_wide_literal_encoding__", "\"UTF-32\"");
+  } else {
+    // FIXME: Less-than 32-bit wchar_t generally means UTF-16
+    // (e.g., Windows, 32-bit IBM). This may need to be
+    // updated if -fwide-exec-charset= is ever supported.
+    Builder.defineMacro("__clang_wide_literal_encoding__", "\"UTF-16\"");
+  }
+
+  if (LangOpts.Optimize)
+    Builder.defineMacro("__OPTIMIZE__");
+  if (LangOpts.OptimizeSize)
+    Builder.defineMacro("__OPTIMIZE_SIZE__");
+
+  if (LangOpts.FastMath)
+    Builder.defineMacro("__FAST_MATH__");
+
+  // Initialize target-specific preprocessor defines.
+
+  // __BYTE_ORDER__ was added in GCC 4.6. It's analogous
+  // to the macro __BYTE_ORDER (no trailing underscores)
+  // from glibc's <endian.h> header.
+  // We don't support the PDP-11 as a target, but include
+  // the define so it can still be compared against.
+  Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234");
+  Builder.defineMacro("__ORDER_BIG_ENDIAN__",    "4321");
+  Builder.defineMacro("__ORDER_PDP_ENDIAN__",    "3412");
+  if (TI.isBigEndian()) {
+    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__");
+    Builder.defineMacro("__BIG_ENDIAN__");
+  } else {
+    Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__");
+    Builder.defineMacro("__LITTLE_ENDIAN__");
+  }
+
+  if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64
+      && TI.getIntWidth() == 32) {
+    Builder.defineMacro("_LP64");
+    Builder.defineMacro("__LP64__");
+  }
+
+  if (TI.getPointerWidth(0) == 32 && TI.getLongWidth() == 32
+      && TI.getIntWidth() == 32) {
+    Builder.defineMacro("_ILP32");
+    Builder.defineMacro("__ILP32__");
+  }
+
+  // Define type sizing macros based on the target properties.
+  assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far");
+  Builder.defineMacro("__CHAR_BIT__", Twine(TI.getCharWidth()));
+
+  Builder.defineMacro("__BOOL_WIDTH__", Twine(TI.getBoolWidth()));
+  Builder.defineMacro("__SHRT_WIDTH__", Twine(TI.getShortWidth()));
+  Builder.defineMacro("__INT_WIDTH__", Twine(TI.getIntWidth()));
+  Builder.defineMacro("__LONG_WIDTH__", Twine(TI.getLongWidth()));
+  Builder.defineMacro("__LLONG_WIDTH__", Twine(TI.getLongLongWidth()));
+
+  size_t BitIntMaxWidth = TI.getMaxBitIntWidth();
+  assert(BitIntMaxWidth <= llvm::IntegerType::MAX_INT_BITS &&
+         "Target defined a max bit width larger than LLVM can support!");
+  assert(BitIntMaxWidth >= TI.getLongLongWidth() &&
+         "Target defined a max bit width smaller than the C standard allows!");
+  Builder.defineMacro("__BITINT_MAXWIDTH__", Twine(BitIntMaxWidth));
+
+  DefineTypeSize("__SCHAR_MAX__", TargetInfo::SignedChar, TI, Builder);
+  DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder);
+  DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder);
+  DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder);
+  DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder);
+  DefineTypeSizeAndWidth("__WCHAR", TI.getWCharType(), TI, Builder);
+  DefineTypeSizeAndWidth("__WINT", TI.getWIntType(), TI, Builder);
+  DefineTypeSizeAndWidth("__INTMAX", TI.getIntMaxType(), TI, Builder);
+  DefineTypeSizeAndWidth("__SIZE", TI.getSizeType(), TI, Builder);
+
+  DefineTypeSizeAndWidth("__UINTMAX", TI.getUIntMaxType(), TI, Builder);
+  DefineTypeSizeAndWidth("__PTRDIFF", TI.getPtrDiffType(0), TI, Builder);
+  DefineTypeSizeAndWidth("__INTPTR", TI.getIntPtrType(), TI, Builder);
+  DefineTypeSizeAndWidth("__UINTPTR", TI.getUIntPtrType(), TI, Builder);
+
+  DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder);
+  DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_PTRDIFF_T__",
+                   TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_SIZE_T__",
+                   TI.getTypeWidth(TI.getSizeType()), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_WCHAR_T__",
+                   TI.getTypeWidth(TI.getWCharType()), TI, Builder);
+  DefineTypeSizeof("__SIZEOF_WINT_T__",
+                   TI.getTypeWidth(TI.getWIntType()), TI, Builder);
+  if (TI.hasInt128Type())
+    DefineTypeSizeof("__SIZEOF_INT128__", 128, TI, Builder);
+
+  DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder);
+  DefineFmt("__INTMAX", TI.getIntMaxType(), TI, Builder);
+  Builder.defineMacro("__INTMAX_C_SUFFIX__",
+                      TI.getTypeConstantSuffix(TI.getIntMaxType()));
+  DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder);
+  DefineFmt("__UINTMAX", TI.getUIntMaxType(), TI, Builder);
+  Builder.defineMacro("__UINTMAX_C_SUFFIX__",
+                      TI.getTypeConstantSuffix(TI.getUIntMaxType()));
+  DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder);
+  DefineFmt("__PTRDIFF", TI.getPtrDiffType(0), TI, Builder);
+  DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder);
+  DefineFmt("__INTPTR", TI.getIntPtrType(), TI, Builder);
+  DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder);
+  DefineFmt("__SIZE", TI.getSizeType(), TI, Builder);
+  DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder);
+  DefineType("__WINT_TYPE__", TI.getWIntType(), Builder);
+  DefineTypeSizeAndWidth("__SIG_ATOMIC", TI.getSigAtomicType(), TI, Builder);
+  DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder);
+  DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder);
+
+  DefineType("__UINTPTR_TYPE__", TI.getUIntPtrType(), Builder);
+  DefineFmt("__UINTPTR", TI.getUIntPtrType(), TI, Builder);
+
+  // The C standard requires the width of uintptr_t and intptr_t to be the same,
+  // per 7.20.2.4p1. Same for intmax_t and uintmax_t, per 7.20.2.5p1.
+  assert(TI.getTypeWidth(TI.getUIntPtrType()) ==
+             TI.getTypeWidth(TI.getIntPtrType()) &&
+         "uintptr_t and intptr_t have different widths?");
+  assert(TI.getTypeWidth(TI.getUIntMaxType()) ==
+             TI.getTypeWidth(TI.getIntMaxType()) &&
+         "uintmax_t and intmax_t have different widths?");
+
+  if (TI.hasFloat16Type())
+    DefineFloatMacros(Builder, "FLT16", &TI.getHalfFormat(), "F16");
+  DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat(), "F");
+  DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat(), "");
+  DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat(), "L");
+
+  // Define a __POINTER_WIDTH__ macro for stdint.h.
+  Builder.defineMacro("__POINTER_WIDTH__",
+                      Twine((int)TI.getPointerWidth(0)));
+
+  // Define __BIGGEST_ALIGNMENT__ to be compatible with gcc.
+  Builder.defineMacro("__BIGGEST_ALIGNMENT__",
+                      Twine(TI.getSuitableAlign() / TI.getCharWidth()) );
+
+  if (!LangOpts.CharIsSigned)
+    Builder.defineMacro("__CHAR_UNSIGNED__");
+
+  if (!TargetInfo::isTypeSigned(TI.getWCharType()))
+    Builder.defineMacro("__WCHAR_UNSIGNED__");
+
+  if (!TargetInfo::isTypeSigned(TI.getWIntType()))
+    Builder.defineMacro("__WINT_UNSIGNED__");
+
+  // Define exact-width integer types for stdint.h
+  DefineExactWidthIntType(TargetInfo::SignedChar, TI, Builder);
+
+  if (TI.getShortWidth() > TI.getCharWidth())
+    DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder);
+
+  if (TI.getIntWidth() > TI.getShortWidth())
+    DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder);
+
+  if (TI.getLongWidth() > TI.getIntWidth())
+    DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder);
+
+  if (TI.getLongLongWidth() > TI.getLongWidth())
+    DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder);
+
+  DefineExactWidthIntType(TargetInfo::UnsignedChar, TI, Builder);
+  DefineExactWidthIntTypeSize(TargetInfo::UnsignedChar, TI, Builder);
+  DefineExactWidthIntTypeSize(TargetInfo::SignedChar, TI, Builder);
+
+  if (TI.getShortWidth() > TI.getCharWidth()) {
+    DefineExactWidthIntType(TargetInfo::UnsignedShort, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::UnsignedShort, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::SignedShort, TI, Builder);
+  }
+
+  if (TI.getIntWidth() > TI.getShortWidth()) {
+    DefineExactWidthIntType(TargetInfo::UnsignedInt, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::UnsignedInt, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::SignedInt, TI, Builder);
+  }
+
+  if (TI.getLongWidth() > TI.getIntWidth()) {
+    DefineExactWidthIntType(TargetInfo::UnsignedLong, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::UnsignedLong, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::SignedLong, TI, Builder);
+  }
+
+  if (TI.getLongLongWidth() > TI.getLongWidth()) {
+    DefineExactWidthIntType(TargetInfo::UnsignedLongLong, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::UnsignedLongLong, TI, Builder);
+    DefineExactWidthIntTypeSize(TargetInfo::SignedLongLong, TI, Builder);
+  }
+
+  DefineLeastWidthIntType(8, true, TI, Builder);
+  DefineLeastWidthIntType(8, false, TI, Builder);
+  DefineLeastWidthIntType(16, true, TI, Builder);
+  DefineLeastWidthIntType(16, false, TI, Builder);
+  DefineLeastWidthIntType(32, true, TI, Builder);
+  DefineLeastWidthIntType(32, false, TI, Builder);
+  DefineLeastWidthIntType(64, true, TI, Builder);
+  DefineLeastWidthIntType(64, false, TI, Builder);
+
+  DefineFastIntType(8, true, TI, Builder);
+  DefineFastIntType(8, false, TI, Builder);
+  DefineFastIntType(16, true, TI, Builder);
+  DefineFastIntType(16, false, TI, Builder);
+  DefineFastIntType(32, true, TI, Builder);
+  DefineFastIntType(32, false, TI, Builder);
+  DefineFastIntType(64, true, TI, Builder);
+  DefineFastIntType(64, false, TI, Builder);
+
+  Builder.defineMacro("__USER_LABEL_PREFIX__", TI.getUserLabelPrefix());
+
+  if (!LangOpts.MathErrno)
+    Builder.defineMacro("__NO_MATH_ERRNO__");
+
+  if (LangOpts.FastMath || LangOpts.FiniteMathOnly)
+    Builder.defineMacro("__FINITE_MATH_ONLY__", "1");
+  else
+    Builder.defineMacro("__FINITE_MATH_ONLY__", "0");
+
+  if (LangOpts.GNUCVersion) {
+    if (LangOpts.GNUInline || LangOpts.CPlusPlus)
+      Builder.defineMacro("__GNUC_GNU_INLINE__");
+    else
+      Builder.defineMacro("__GNUC_STDC_INLINE__");
+
+    // The value written by __atomic_test_and_set.
+    // FIXME: This is target-dependent.
+    Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1");
+  }
+
+  auto addLockFreeMacros = [&](const llvm::Twine &Prefix) {
+    // Used by libc++ and libstdc++ to implement ATOMIC_<foo>_LOCK_FREE.
+    unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth();
+#define DEFINE_LOCK_FREE_MACRO(TYPE, Type)                                     \
+  Builder.defineMacro(Prefix + #TYPE "_LOCK_FREE",                             \
+                      getLockFreeValue(TI.get##Type##Width(),                  \
+                                       TI.get##Type##Align(),                  \
+                                       InlineWidthBits));
+    DEFINE_LOCK_FREE_MACRO(BOOL, Bool);
+    DEFINE_LOCK_FREE_MACRO(CHAR, Char);
+    if (LangOpts.Char8)
+      DEFINE_LOCK_FREE_MACRO(CHAR8_T, Char); // Treat char8_t like char.
+    DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16);
+    DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32);
+    DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar);
+    DEFINE_LOCK_FREE_MACRO(SHORT, Short);
+    DEFINE_LOCK_FREE_MACRO(INT, Int);
+    DEFINE_LOCK_FREE_MACRO(LONG, Long);
+    DEFINE_LOCK_FREE_MACRO(LLONG, LongLong);
+    Builder.defineMacro(Prefix + "POINTER_LOCK_FREE",
+                        getLockFreeValue(TI.getPointerWidth(0),
+                                         TI.getPointerAlign(0),
+                                         InlineWidthBits));
+#undef DEFINE_LOCK_FREE_MACRO
+  };
+  addLockFreeMacros("__CLANG_ATOMIC_");
+  if (LangOpts.GNUCVersion)
+    addLockFreeMacros("__GCC_ATOMIC_");
+
+  if (LangOpts.NoInlineDefine)
+    Builder.defineMacro("__NO_INLINE__");
+
+  if (unsigned PICLevel = LangOpts.PICLevel) {
+    Builder.defineMacro("__PIC__", Twine(PICLevel));
+    Builder.defineMacro("__pic__", Twine(PICLevel));
+    if (LangOpts.PIE) {
+      Builder.defineMacro("__PIE__", Twine(PICLevel));
+      Builder.defineMacro("__pie__", Twine(PICLevel));
+    }
+  }
+
+  // Macros to control C99 numerics and <float.h>
+  Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod()));
+  Builder.defineMacro("__FLT_RADIX__", "2");
+  Builder.defineMacro("__DECIMAL_DIG__", "__LDBL_DECIMAL_DIG__");
+
+  if (LangOpts.getStackProtector() == LangOptions::SSPOn)
+    Builder.defineMacro("__SSP__");
+  else if (LangOpts.getStackProtector() == LangOptions::SSPStrong)
+    Builder.defineMacro("__SSP_STRONG__", "2");
+  else if (LangOpts.getStackProtector() == LangOptions::SSPReq)
+    Builder.defineMacro("__SSP_ALL__", "3");
+
+  if (PPOpts.SetUpStaticAnalyzer)
+    Builder.defineMacro("__clang_analyzer__");
+
+  if (LangOpts.FastRelaxedMath)
+    Builder.defineMacro("__FAST_RELAXED_MATH__");
+
+  if (FEOpts.ProgramAction == frontend::RewriteObjC ||
+      LangOpts.getGC() != LangOptions::NonGC) {
+    Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))");
+    Builder.defineMacro("__strong", "__attribute__((objc_gc(strong)))");
+    Builder.defineMacro("__autoreleasing", "");
+    Builder.defineMacro("__unsafe_unretained", "");
+  } else if (LangOpts.ObjC) {
+    Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))");
+    Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))");
+    Builder.defineMacro("__autoreleasing",
+                        "__attribute__((objc_ownership(autoreleasing)))");
+    Builder.defineMacro("__unsafe_unretained",
+                        "__attribute__((objc_ownership(none)))");
+  }
+
+  // On Darwin, there are __double_underscored variants of the type
+  // nullability qualifiers.
+  if (TI.getTriple().isOSDarwin()) {
+    Builder.defineMacro("__nonnull", "_Nonnull");
+    Builder.defineMacro("__null_unspecified", "_Null_unspecified");
+    Builder.defineMacro("__nullable", "_Nullable");
+  }
+
+  // Add a macro to differentiate between regular iOS/tvOS/watchOS targets and
+  // the corresponding simulator targets.
+  if (TI.getTriple().isOSDarwin() && TI.getTriple().isSimulatorEnvironment())
+    Builder.defineMacro("__APPLE_EMBEDDED_SIMULATOR__", "1");
+
+  // OpenMP definition
+  // OpenMP 2.2:
+  //   In implementations that support a preprocessor, the _OPENMP
+  //   macro name is defined to have the decimal value yyyymm where
+  //   yyyy and mm are the year and the month designations of the
+  //   version of the OpenMP API that the implementation support.
+  if (!LangOpts.OpenMPSimd) {
+    switch (LangOpts.OpenMP) {
+    case 0:
+      break;
+    case 31:
+      Builder.defineMacro("_OPENMP", "201107");
+      break;
+    case 40:
+      Builder.defineMacro("_OPENMP", "201307");
+      break;
+    case 45:
+      Builder.defineMacro("_OPENMP", "201511");
+      break;
+    case 51:
+      Builder.defineMacro("_OPENMP", "202011");
+      break;
+    case 52:
+      Builder.defineMacro("_OPENMP", "202111");
+      break;
+    default:
+      // Default version is OpenMP 5.0
+      Builder.defineMacro("_OPENMP", "201811");
+      break;
+    }
+  }
+
+  // CUDA device path compilaton
+  if (LangOpts.CUDAIsDevice && !LangOpts.HIP) {
+    // The CUDA_ARCH value is set for the GPU target specified in the NVPTX
+    // backend's target defines.
+    Builder.defineMacro("__CUDA_ARCH__");
+  }
+
+  // We need to communicate this to our CUDA header wrapper, which in turn
+  // informs the proper CUDA headers of this choice.
+  if (LangOpts.CUDADeviceApproxTranscendentals || LangOpts.FastMath) {
+    Builder.defineMacro("__CLANG_CUDA_APPROX_TRANSCENDENTALS__");
+  }
+
+  // Define a macro indicating that the source file is being compiled with a
+  // SYCL device compiler which doesn't produce host binary.
+  if (LangOpts.SYCLIsDevice) {
+    Builder.defineMacro("__SYCL_DEVICE_ONLY__", "1");
+  }
+
+  // OpenCL definitions.
+  if (LangOpts.OpenCL) {
+    InitializeOpenCLFeatureTestMacros(TI, LangOpts, Builder);
+
+    if (TI.getTriple().isSPIR() || TI.getTriple().isSPIRV())
+      Builder.defineMacro("__IMAGE_SUPPORT__");
+  }
+
+  if (TI.hasInt128Type() && LangOpts.CPlusPlus && LangOpts.GNUMode) {
+    // For each extended integer type, g++ defines a macro mapping the
+    // index of the type (0 in this case) in some list of extended types
+    // to the type.
+    Builder.defineMacro("__GLIBCXX_TYPE_INT_N_0", "__int128");
+    Builder.defineMacro("__GLIBCXX_BITSIZE_INT_N_0", "128");
+  }
+
+  // Get other target #defines.
+  TI.getTargetDefines(LangOpts, Builder);
+}
+
+/// InitializePreprocessor - Initialize the preprocessor getting it and the
+/// environment ready to process a single file. This returns true on error.
+///
+void clang::InitializePreprocessor(
+    Preprocessor &PP, const PreprocessorOptions &InitOpts,
+    const PCHContainerReader &PCHContainerRdr,
+    const FrontendOptions &FEOpts) {
+  const LangOptions &LangOpts = PP.getLangOpts();
+  std::string PredefineBuffer;
+  PredefineBuffer.reserve(4080);
+  llvm::raw_string_ostream Predefines(PredefineBuffer);
+  MacroBuilder Builder(Predefines);
+
+  // Emit line markers for various builtin sections of the file.  We don't do
+  // this in asm preprocessor mode, because "# 4" is not a line marker directive
+  // in this mode.
+  if (!PP.getLangOpts().AsmPreprocessor)
+    Builder.append("# 1 \"<built-in>\" 3");
+
+  // Install things like __POWERPC__, __GNUC__, etc into the macro table.
+  if (InitOpts.UsePredefines) {
+    // FIXME: This will create multiple definitions for most of the predefined
+    // macros. This is not the right way to handle this.
+    if ((LangOpts.CUDA || LangOpts.OpenMPIsDevice || LangOpts.SYCLIsDevice) &&
+        PP.getAuxTargetInfo())
+      InitializePredefinedMacros(*PP.getAuxTargetInfo(), LangOpts, FEOpts,
+                                 PP.getPreprocessorOpts(), Builder);
+
+    InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts,
+                               PP.getPreprocessorOpts(), Builder);
+
+    // Install definitions to make Objective-C++ ARC work well with various
+    // C++ Standard Library implementations.
+    if (LangOpts.ObjC && LangOpts.CPlusPlus &&
+        (LangOpts.ObjCAutoRefCount || LangOpts.ObjCWeak)) {
+      switch (InitOpts.ObjCXXARCStandardLibrary) {
+      case ARCXX_nolib:
+      case ARCXX_libcxx:
+        break;
+
+      case ARCXX_libstdcxx:
+        AddObjCXXARCLibstdcxxDefines(LangOpts, Builder);
+        break;
+      }
+    }
+  }
+
+  // Even with predefines off, some macros are still predefined.
+  // These should all be defined in the preprocessor according to the
+  // current language configuration.
+  InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(),
+                                     FEOpts, Builder);
+
+  // Add on the predefines from the driver.  Wrap in a #line directive to report
+  // that they come from the command line.
+  if (!PP.getLangOpts().AsmPreprocessor)
+    Builder.append("# 1 \"<command line>\" 1");
+
+  // Process #define's and #undef's in the order they are given.
+  for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) {
+    if (InitOpts.Macros[i].second)  // isUndef
+      Builder.undefineMacro(InitOpts.Macros[i].first);
+    else
+      DefineBuiltinMacro(Builder, InitOpts.Macros[i].first,
+                         PP.getDiagnostics());
+  }
+
+  // Exit the command line and go back to <built-in> (2 is LC_LEAVE).
+  if (!PP.getLangOpts().AsmPreprocessor)
+    Builder.append("# 1 \"<built-in>\" 2");
+
+  // If -imacros are specified, include them now.  These are processed before
+  // any -include directives.
+  for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i)
+    AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i]);
+
+  // Process -include-pch/-include-pth directives.
+  if (!InitOpts.ImplicitPCHInclude.empty())
+    AddImplicitIncludePCH(Builder, PP, PCHContainerRdr,
+                          InitOpts.ImplicitPCHInclude);
+
+  // Process -include directives.
+  for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) {
+    const std::string &Path = InitOpts.Includes[i];
+    AddImplicitInclude(Builder, Path);
+  }
+
+  // Instruct the preprocessor to skip the preamble.
+  PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first,
+                             InitOpts.PrecompiledPreambleBytes.second);
+
+  // Copy PredefinedBuffer into the Preprocessor.
+  PP.setPredefines(Predefines.str());
+}
diff --git a/contrib/libs/clang14/lib/Frontend/InterfaceStubFunctionsConsumer.cpp b/contrib/libs/clang14/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
new file mode 100644
index 0000000000..d58f5bb091
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/InterfaceStubFunctionsConsumer.cpp
@@ -0,0 +1,340 @@
+//===--- InterfaceStubFunctionsConsumer.cpp -------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/Mangle.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Sema/TemplateInstCallback.h"
+#include "llvm/BinaryFormat/ELF.h"
+
+using namespace clang;
+
+namespace {
+class InterfaceStubFunctionsConsumer : public ASTConsumer {
+  CompilerInstance &Instance;
+  StringRef InFile;
+  StringRef Format;
+  std::set<std::string> ParsedTemplates;
+
+  enum RootDeclOrigin { TopLevel = 0, FromTU = 1, IsLate = 2 };
+  struct MangledSymbol {
+    std::string ParentName;
+    uint8_t Type;
+    uint8_t Binding;
+    std::vector<std::string> Names;
+    MangledSymbol() = delete;
+
+    MangledSymbol(const std::string &ParentName, uint8_t Type, uint8_t Binding,
+                  std::vector<std::string> Names)
+        : ParentName(ParentName), Type(Type), Binding(Binding), Names(Names) {}
+  };
+  using MangledSymbols = std::map<const NamedDecl *, MangledSymbol>;
+
+  bool WriteNamedDecl(const NamedDecl *ND, MangledSymbols &Symbols, int RDO) {
+    // Here we filter out anything that's not set to DefaultVisibility.
+    // DefaultVisibility is set on a decl when -fvisibility is not specified on
+    // the command line (or specified as default) and the decl does not have
+    // __attribute__((visibility("hidden"))) set or when the command line
+    // argument is set to hidden but the decl explicitly has
+    // __attribute__((visibility ("default"))) set. We do this so that the user
+    // can have fine grain control of what they want to expose in the stub.
+    auto isVisible = [](const NamedDecl *ND) -> bool {
+      return ND->getVisibility() == DefaultVisibility;
+    };
+
+    auto ignoreDecl = [this, isVisible](const NamedDecl *ND) -> bool {
+      if (!isVisible(ND))
+        return true;
+
+      if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
+        if (const auto *Parent = VD->getParentFunctionOrMethod())
+          if (isa<BlockDecl>(Parent) || isa<CXXMethodDecl>(Parent))
+            return true;
+
+        if ((VD->getStorageClass() == StorageClass::SC_Extern) ||
+            (VD->getStorageClass() == StorageClass::SC_Static &&
+             VD->getParentFunctionOrMethod() == nullptr))
+          return true;
+      }
+
+      if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
+        if (FD->isInlined() && !isa<CXXMethodDecl>(FD) &&
+            !Instance.getLangOpts().GNUInline)
+          return true;
+        if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
+          if (const auto *RC = dyn_cast<CXXRecordDecl>(MD->getParent()))
+            if (isa<ClassTemplateDecl>(RC->getParent()) || !isVisible(RC))
+              return true;
+          if (MD->isDependentContext() || !MD->hasBody())
+            return true;
+        }
+        if (FD->getStorageClass() == StorageClass::SC_Static)
+          return true;
+      }
+      return false;
+    };
+
+    auto getParentFunctionDecl = [](const NamedDecl *ND) -> const NamedDecl * {
+      if (const VarDecl *VD = dyn_cast<VarDecl>(ND))
+        if (const auto *FD =
+                dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod()))
+          return FD;
+      return nullptr;
+    };
+
+    auto getMangledNames = [](const NamedDecl *ND) -> std::vector<std::string> {
+      if (!ND)
+        return {""};
+      ASTNameGenerator NameGen(ND->getASTContext());
+      std::vector<std::string> MangledNames = NameGen.getAllManglings(ND);
+      if (isa<CXXConstructorDecl>(ND) || isa<CXXDestructorDecl>(ND))
+        return MangledNames;
+#ifdef EXPENSIVE_CHECKS
+      assert(MangledNames.size() <= 1 && "Expected only one name mangling.");
+#endif
+      return {NameGen.getName(ND)};
+    };
+
+    if (!(RDO & FromTU))
+      return true;
+    if (Symbols.find(ND) != Symbols.end())
+      return true;
+    // - Currently have not figured out how to produce the names for FieldDecls.
+    // - Do not want to produce symbols for function paremeters.
+    if (isa<FieldDecl>(ND) || isa<ParmVarDecl>(ND))
+      return true;
+
+    const NamedDecl *ParentDecl = getParentFunctionDecl(ND);
+    if ((ParentDecl && ignoreDecl(ParentDecl)) || ignoreDecl(ND))
+      return true;
+
+    if (RDO & IsLate) {
+      Instance.getDiagnostics().Report(diag::err_asm_invalid_type_in_input)
+          << "Generating Interface Stubs is not supported with "
+             "delayed template parsing.";
+    } else {
+      if (const auto *FD = dyn_cast<FunctionDecl>(ND))
+        if (FD->isDependentContext())
+          return true;
+
+      const bool IsWeak = (ND->hasAttr<WeakAttr>() ||
+                           ND->hasAttr<WeakRefAttr>() || ND->isWeakImported());
+
+      Symbols.insert(std::make_pair(
+          ND,
+          MangledSymbol(getMangledNames(ParentDecl).front(),
+                        // Type:
+                        isa<VarDecl>(ND) ? llvm::ELF::STT_OBJECT
+                                         : llvm::ELF::STT_FUNC,
+                        // Binding:
+                        IsWeak ? llvm::ELF::STB_WEAK : llvm::ELF::STB_GLOBAL,
+                        getMangledNames(ND))));
+    }
+    return true;
+  }
+
+  void
+  HandleDecls(const llvm::iterator_range<DeclContext::decl_iterator> &Decls,
+              MangledSymbols &Symbols, int RDO) {
+    for (const auto *D : Decls)
+      HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
+  }
+
+  void HandleTemplateSpecializations(const FunctionTemplateDecl &FTD,
+                                     MangledSymbols &Symbols, int RDO) {
+    for (const auto *D : FTD.specializations())
+      HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
+  }
+
+  void HandleTemplateSpecializations(const ClassTemplateDecl &CTD,
+                                     MangledSymbols &Symbols, int RDO) {
+    for (const auto *D : CTD.specializations())
+      HandleNamedDecl(dyn_cast<NamedDecl>(D), Symbols, RDO);
+  }
+
+  bool HandleNamedDecl(const NamedDecl *ND, MangledSymbols &Symbols, int RDO) {
+    if (!ND)
+      return false;
+
+    switch (ND->getKind()) {
+    default:
+      break;
+    case Decl::Kind::Namespace:
+      HandleDecls(cast<NamespaceDecl>(ND)->decls(), Symbols, RDO);
+      return true;
+    case Decl::Kind::CXXRecord:
+      HandleDecls(cast<CXXRecordDecl>(ND)->decls(), Symbols, RDO);
+      return true;
+    case Decl::Kind::ClassTemplateSpecialization:
+      HandleDecls(cast<ClassTemplateSpecializationDecl>(ND)->decls(), Symbols,
+                  RDO);
+      return true;
+    case Decl::Kind::ClassTemplate:
+      HandleTemplateSpecializations(*cast<ClassTemplateDecl>(ND), Symbols, RDO);
+      return true;
+    case Decl::Kind::FunctionTemplate:
+      HandleTemplateSpecializations(*cast<FunctionTemplateDecl>(ND), Symbols,
+                                    RDO);
+      return true;
+    case Decl::Kind::Record:
+    case Decl::Kind::Typedef:
+    case Decl::Kind::Enum:
+    case Decl::Kind::EnumConstant:
+    case Decl::Kind::TemplateTypeParm:
+    case Decl::Kind::NonTypeTemplateParm:
+    case Decl::Kind::CXXConversion:
+    case Decl::Kind::UnresolvedUsingValue:
+    case Decl::Kind::Using:
+    case Decl::Kind::UsingShadow:
+    case Decl::Kind::TypeAliasTemplate:
+    case Decl::Kind::TypeAlias:
+    case Decl::Kind::VarTemplate:
+    case Decl::Kind::VarTemplateSpecialization:
+    case Decl::Kind::UsingDirective:
+    case Decl::Kind::TemplateTemplateParm:
+    case Decl::Kind::ClassTemplatePartialSpecialization:
+    case Decl::Kind::IndirectField:
+    case Decl::Kind::ConstructorUsingShadow:
+    case Decl::Kind::CXXDeductionGuide:
+    case Decl::Kind::NamespaceAlias:
+    case Decl::Kind::UnresolvedUsingTypename:
+      return true;
+    case Decl::Kind::Var: {
+      // Bail on any VarDecl that either has no named symbol.
+      if (!ND->getIdentifier())
+        return true;
+      const auto *VD = cast<VarDecl>(ND);
+      // Bail on any VarDecl that is a dependent or templated type.
+      if (VD->isTemplated() || VD->getType()->isDependentType())
+        return true;
+      if (WriteNamedDecl(ND, Symbols, RDO))
+        return true;
+      break;
+    }
+    case Decl::Kind::ParmVar:
+    case Decl::Kind::CXXMethod:
+    case Decl::Kind::CXXConstructor:
+    case Decl::Kind::CXXDestructor:
+    case Decl::Kind::Function:
+    case Decl::Kind::Field:
+      if (WriteNamedDecl(ND, Symbols, RDO))
+        return true;
+    }
+
+    // While interface stubs are in the development stage, it's probably best to
+    // catch anything that's not a VarDecl or Template/FunctionDecl.
+    Instance.getDiagnostics().Report(diag::err_asm_invalid_type_in_input)
+        << "Expected a function or function template decl.";
+    return false;
+  }
+
+public:
+  InterfaceStubFunctionsConsumer(CompilerInstance &Instance, StringRef InFile,
+                                 StringRef Format)
+      : Instance(Instance), InFile(InFile), Format(Format) {}
+
+  void HandleTranslationUnit(ASTContext &context) override {
+    struct Visitor : public RecursiveASTVisitor<Visitor> {
+      bool VisitNamedDecl(NamedDecl *ND) {
+        if (const auto *FD = dyn_cast<FunctionDecl>(ND))
+          if (FD->isLateTemplateParsed()) {
+            LateParsedDecls.insert(FD);
+            return true;
+          }
+
+        if (const auto *VD = dyn_cast<ValueDecl>(ND)) {
+          ValueDecls.insert(VD);
+          return true;
+        }
+
+        NamedDecls.insert(ND);
+        return true;
+      }
+
+      std::set<const NamedDecl *> LateParsedDecls;
+      std::set<NamedDecl *> NamedDecls;
+      std::set<const ValueDecl *> ValueDecls;
+    } v;
+
+    v.TraverseDecl(context.getTranslationUnitDecl());
+
+    MangledSymbols Symbols;
+    auto OS = Instance.createDefaultOutputFile(/*Binary=*/false, InFile, "ifs");
+    if (!OS)
+      return;
+
+    if (Instance.getLangOpts().DelayedTemplateParsing) {
+      clang::Sema &S = Instance.getSema();
+      for (const auto *FD : v.LateParsedDecls) {
+        clang::LateParsedTemplate &LPT =
+            *S.LateParsedTemplateMap.find(cast<FunctionDecl>(FD))->second;
+        S.LateTemplateParser(S.OpaqueParser, LPT);
+        HandleNamedDecl(FD, Symbols, (FromTU | IsLate));
+      }
+    }
+
+    for (const NamedDecl *ND : v.ValueDecls)
+      HandleNamedDecl(ND, Symbols, FromTU);
+    for (const NamedDecl *ND : v.NamedDecls)
+      HandleNamedDecl(ND, Symbols, FromTU);
+
+    auto writeIfsV1 = [this](const llvm::Triple &T,
+                             const MangledSymbols &Symbols,
+                             const ASTContext &context, StringRef Format,
+                             raw_ostream &OS) -> void {
+      OS << "--- !" << Format << "\n";
+      OS << "IfsVersion: 3.0\n";
+      OS << "Target: " << T.str() << "\n";
+      OS << "Symbols:\n";
+      for (const auto &E : Symbols) {
+        const MangledSymbol &Symbol = E.second;
+        for (auto Name : Symbol.Names) {
+          OS << "  - { Name: \""
+             << (Symbol.ParentName.empty() || Instance.getLangOpts().CPlusPlus
+                     ? ""
+                     : (Symbol.ParentName + "."))
+             << Name << "\", Type: ";
+          switch (Symbol.Type) {
+          default:
+            llvm_unreachable(
+                "clang -emit-interface-stubs: Unexpected symbol type.");
+          case llvm::ELF::STT_NOTYPE:
+            OS << "NoType";
+            break;
+          case llvm::ELF::STT_OBJECT: {
+            auto VD = cast<ValueDecl>(E.first)->getType();
+            OS << "Object, Size: "
+               << context.getTypeSizeInChars(VD).getQuantity();
+            break;
+          }
+          case llvm::ELF::STT_FUNC:
+            OS << "Func";
+            break;
+          }
+          if (Symbol.Binding == llvm::ELF::STB_WEAK)
+            OS << ", Weak: true";
+          OS << " }\n";
+        }
+      }
+      OS << "...\n";
+      OS.flush();
+    };
+
+    assert(Format == "ifs-v1" && "Unexpected IFS Format.");
+    writeIfsV1(Instance.getTarget().getTriple(), Symbols, context, Format, *OS);
+  }
+};
+} // namespace
+
+std::unique_ptr<ASTConsumer>
+GenerateInterfaceStubsAction::CreateASTConsumer(CompilerInstance &CI,
+                                                StringRef InFile) {
+  return std::make_unique<InterfaceStubFunctionsConsumer>(CI, InFile, "ifs-v1");
+}
diff --git a/contrib/libs/clang14/lib/Frontend/LayoutOverrideSource.cpp b/contrib/libs/clang14/lib/Frontend/LayoutOverrideSource.cpp
new file mode 100644
index 0000000000..0d288db063
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/LayoutOverrideSource.cpp
@@ -0,0 +1,207 @@
+//===--- LayoutOverrideSource.cpp --Override Record Layouts ---------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "clang/Frontend/LayoutOverrideSource.h"
+#include "clang/AST/Decl.h"
+#include "clang/Basic/CharInfo.h"
+#include "llvm/Support/raw_ostream.h"
+#include <fstream>
+#include <string>
+
+using namespace clang;
+
+/// Parse a simple identifier.
+static std::string parseName(StringRef S) {
+  if (S.empty() || !isAsciiIdentifierStart(S[0]))
+    return "";
+
+  unsigned Offset = 1;
+  while (Offset < S.size() && isAsciiIdentifierContinue(S[Offset]))
+    ++Offset;
+
+  return S.substr(0, Offset).str();
+}
+
+LayoutOverrideSource::LayoutOverrideSource(StringRef Filename) {
+  std::ifstream Input(Filename.str().c_str());
+  if (!Input.is_open())
+    return;
+
+  // Parse the output of -fdump-record-layouts.
+  std::string CurrentType;
+  Layout CurrentLayout;
+  bool ExpectingType = false;
+
+  while (Input.good()) {
+    std::string Line;
+    getline(Input, Line);
+
+    StringRef LineStr(Line);
+
+    // Determine whether the following line will start a
+    if (LineStr.contains("*** Dumping AST Record Layout")) {
+      // Flush the last type/layout, if there is one.
+      if (!CurrentType.empty())
+        Layouts[CurrentType] = CurrentLayout;
+      CurrentLayout = Layout();
+
+      ExpectingType = true;
+      continue;
+    }
+
+    // If we're expecting a type, grab it.
+    if (ExpectingType) {
+      ExpectingType = false;
+
+      StringRef::size_type Pos;
+      if ((Pos = LineStr.find("struct ")) != StringRef::npos)
+        LineStr = LineStr.substr(Pos + strlen("struct "));
+      else if ((Pos = LineStr.find("class ")) != StringRef::npos)
+        LineStr = LineStr.substr(Pos + strlen("class "));
+      else if ((Pos = LineStr.find("union ")) != StringRef::npos)
+        LineStr = LineStr.substr(Pos + strlen("union "));
+      else
+        continue;
+
+      // Find the name of the type.
+      CurrentType = parseName(LineStr);
+      CurrentLayout = Layout();
+      continue;
+    }
+
+    // Check for the size of the type.
+    StringRef::size_type Pos = LineStr.find(" Size:");
+    if (Pos != StringRef::npos) {
+      // Skip past the " Size:" prefix.
+      LineStr = LineStr.substr(Pos + strlen(" Size:"));
+
+      unsigned long long Size = 0;
+      (void)LineStr.getAsInteger(10, Size);
+      CurrentLayout.Size = Size;
+      continue;
+    }
+
+    // Check for the alignment of the type.
+    Pos = LineStr.find("Alignment:");
+    if (Pos != StringRef::npos) {
+      // Skip past the "Alignment:" prefix.
+      LineStr = LineStr.substr(Pos + strlen("Alignment:"));
+
+      unsigned long long Alignment = 0;
+      (void)LineStr.getAsInteger(10, Alignment);
+      CurrentLayout.Align = Alignment;
+      continue;
+    }
+
+    // Check for the size/alignment of the type.
+    Pos = LineStr.find("sizeof=");
+    if (Pos != StringRef::npos) {
+      /* Skip past the sizeof= prefix. */
+      LineStr = LineStr.substr(Pos + strlen("sizeof="));
+
+      // Parse size.
+      unsigned long long Size = 0;
+      (void)LineStr.getAsInteger(10, Size);
+      CurrentLayout.Size = Size;
+
+      Pos = LineStr.find("align=");
+      if (Pos != StringRef::npos) {
+        /* Skip past the align= prefix. */
+        LineStr = LineStr.substr(Pos + strlen("align="));
+
+        // Parse alignment.
+        unsigned long long Alignment = 0;
+        (void)LineStr.getAsInteger(10, Alignment);
+        CurrentLayout.Align = Alignment;
+      }
+
+      continue;
+    }
+
+    // Check for the field offsets of the type.
+    Pos = LineStr.find("FieldOffsets: [");
+    if (Pos == StringRef::npos)
+      continue;
+
+    LineStr = LineStr.substr(Pos + strlen("FieldOffsets: ["));
+    while (!LineStr.empty() && isDigit(LineStr[0])) {
+      // Parse this offset.
+      unsigned Idx = 1;
+      while (Idx < LineStr.size() && isDigit(LineStr[Idx]))
+        ++Idx;
+
+      unsigned long long Offset = 0;
+      (void)LineStr.substr(0, Idx).getAsInteger(10, Offset);
+
+      CurrentLayout.FieldOffsets.push_back(Offset);
+
+      // Skip over this offset, the following comma, and any spaces.
+      LineStr = LineStr.substr(Idx + 1);
+      while (!LineStr.empty() && isWhitespace(LineStr[0]))
+        LineStr = LineStr.substr(1);
+    }
+  }
+
+  // Flush the last type/layout, if there is one.
+  if (!CurrentType.empty())
+    Layouts[CurrentType] = CurrentLayout;
+}
+
+bool
+LayoutOverrideSource::layoutRecordType(const RecordDecl *Record,
+  uint64_t &Size, uint64_t &Alignment,
+  llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
+  llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
+  llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets)
+{
+  // We can't override unnamed declarations.
+  if (!Record->getIdentifier())
+    return false;
+
+  // Check whether we have a layout for this record.
+  llvm::StringMap<Layout>::iterator Known = Layouts.find(Record->getName());
+  if (Known == Layouts.end())
+    return false;
+
+  // Provide field layouts.
+  unsigned NumFields = 0;
+  for (RecordDecl::field_iterator F = Record->field_begin(),
+                               FEnd = Record->field_end();
+       F != FEnd; ++F, ++NumFields) {
+    if (NumFields >= Known->second.FieldOffsets.size())
+      continue;
+
+    FieldOffsets[*F] = Known->second.FieldOffsets[NumFields];
+  }
+
+  // Wrong number of fields.
+  if (NumFields != Known->second.FieldOffsets.size())
+    return false;
+
+  Size = Known->second.Size;
+  Alignment = Known->second.Align;
+  return true;
+}
+
+LLVM_DUMP_METHOD void LayoutOverrideSource::dump() {
+  raw_ostream &OS = llvm::errs();
+  for (llvm::StringMap<Layout>::iterator L = Layouts.begin(),
+                                      LEnd = Layouts.end();
+       L != LEnd; ++L) {
+    OS << "Type: blah " << L->first() << '\n';
+    OS << "  Size:" << L->second.Size << '\n';
+    OS << "  Alignment:" << L->second.Align << '\n';
+    OS << "  FieldOffsets: [";
+    for (unsigned I = 0, N = L->second.FieldOffsets.size(); I != N; ++I) {
+      if (I)
+        OS << ", ";
+      OS << L->second.FieldOffsets[I];
+    }
+    OS << "]\n";
+  }
+}
+
diff --git a/contrib/libs/clang14/lib/Frontend/LogDiagnosticPrinter.cpp b/contrib/libs/clang14/lib/Frontend/LogDiagnosticPrinter.cpp
new file mode 100644
index 0000000000..df8b23691a
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/LogDiagnosticPrinter.cpp
@@ -0,0 +1,165 @@
+//===--- LogDiagnosticPrinter.cpp - Log Diagnostic Printer ----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/LogDiagnosticPrinter.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/PlistSupport.h"
+#include "clang/Basic/SourceManager.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+using namespace markup;
+
+LogDiagnosticPrinter::LogDiagnosticPrinter(
+    raw_ostream &os, DiagnosticOptions *diags,
+    std::unique_ptr<raw_ostream> StreamOwner)
+    : OS(os), StreamOwner(std::move(StreamOwner)), LangOpts(nullptr),
+      DiagOpts(diags) {}
+
+static StringRef getLevelName(DiagnosticsEngine::Level Level) {
+  switch (Level) {
+  case DiagnosticsEngine::Ignored: return "ignored";
+  case DiagnosticsEngine::Remark:  return "remark";
+  case DiagnosticsEngine::Note:    return "note";
+  case DiagnosticsEngine::Warning: return "warning";
+  case DiagnosticsEngine::Error:   return "error";
+  case DiagnosticsEngine::Fatal:   return "fatal error";
+  }
+  llvm_unreachable("Invalid DiagnosticsEngine level!");
+}
+
+void
+LogDiagnosticPrinter::EmitDiagEntry(llvm::raw_ostream &OS,
+                                    const LogDiagnosticPrinter::DiagEntry &DE) {
+  OS << "    <dict>\n";
+  OS << "      <key>level</key>\n"
+     << "      ";
+  EmitString(OS, getLevelName(DE.DiagnosticLevel)) << '\n';
+  if (!DE.Filename.empty()) {
+    OS << "      <key>filename</key>\n"
+       << "      ";
+    EmitString(OS, DE.Filename) << '\n';
+  }
+  if (DE.Line != 0) {
+    OS << "      <key>line</key>\n"
+       << "      ";
+    EmitInteger(OS, DE.Line) << '\n';
+  }
+  if (DE.Column != 0) {
+    OS << "      <key>column</key>\n"
+       << "      ";
+    EmitInteger(OS, DE.Column) << '\n';
+  }
+  if (!DE.Message.empty()) {
+    OS << "      <key>message</key>\n"
+       << "      ";
+    EmitString(OS, DE.Message) << '\n';
+  }
+  OS << "      <key>ID</key>\n"
+     << "      ";
+  EmitInteger(OS, DE.DiagnosticID) << '\n';
+  if (!DE.WarningOption.empty()) {
+    OS << "      <key>WarningOption</key>\n"
+       << "      ";
+    EmitString(OS, DE.WarningOption) << '\n';
+  }
+  OS << "    </dict>\n";
+}
+
+void LogDiagnosticPrinter::EndSourceFile() {
+  // We emit all the diagnostics in EndSourceFile. However, we don't emit any
+  // entry if no diagnostics were present.
+  //
+  // Note that DiagnosticConsumer has no "end-of-compilation" callback, so we
+  // will miss any diagnostics which are emitted after and outside the
+  // translation unit processing.
+  if (Entries.empty())
+    return;
+
+  // Write to a temporary string to ensure atomic write of diagnostic object.
+  SmallString<512> Msg;
+  llvm::raw_svector_ostream OS(Msg);
+
+  OS << "<dict>\n";
+  if (!MainFilename.empty()) {
+    OS << "  <key>main-file</key>\n"
+       << "  ";
+    EmitString(OS, MainFilename) << '\n';
+  }
+  if (!DwarfDebugFlags.empty()) {
+    OS << "  <key>dwarf-debug-flags</key>\n"
+       << "  ";
+    EmitString(OS, DwarfDebugFlags) << '\n';
+  }
+  OS << "  <key>diagnostics</key>\n";
+  OS << "  <array>\n";
+  for (auto &DE : Entries)
+    EmitDiagEntry(OS, DE);
+  OS << "  </array>\n";
+  OS << "</dict>\n";
+
+  this->OS << OS.str();
+}
+
+void LogDiagnosticPrinter::HandleDiagnostic(DiagnosticsEngine::Level Level,
+                                            const Diagnostic &Info) {
+  // Default implementation (Warnings/errors count).
+  DiagnosticConsumer::HandleDiagnostic(Level, Info);
+
+  // Initialize the main file name, if we haven't already fetched it.
+  if (MainFilename.empty() && Info.hasSourceManager()) {
+    const SourceManager &SM = Info.getSourceManager();
+    FileID FID = SM.getMainFileID();
+    if (FID.isValid()) {
+      const FileEntry *FE = SM.getFileEntryForID(FID);
+      if (FE && FE->isValid())
+        MainFilename = std::string(FE->getName());
+    }
+  }
+
+  // Create the diag entry.
+  DiagEntry DE;
+  DE.DiagnosticID = Info.getID();
+  DE.DiagnosticLevel = Level;
+
+  DE.WarningOption =
+      std::string(DiagnosticIDs::getWarningOptionForDiag(DE.DiagnosticID));
+
+  // Format the message.
+  SmallString<100> MessageStr;
+  Info.FormatDiagnostic(MessageStr);
+  DE.Message = std::string(MessageStr.str());
+
+  // Set the location information.
+  DE.Filename = "";
+  DE.Line = DE.Column = 0;
+  if (Info.getLocation().isValid() && Info.hasSourceManager()) {
+    const SourceManager &SM = Info.getSourceManager();
+    PresumedLoc PLoc = SM.getPresumedLoc(Info.getLocation());
+
+    if (PLoc.isInvalid()) {
+      // At least print the file name if available:
+      FileID FID = SM.getFileID(Info.getLocation());
+      if (FID.isValid()) {
+        const FileEntry *FE = SM.getFileEntryForID(FID);
+        if (FE && FE->isValid())
+          DE.Filename = std::string(FE->getName());
+      }
+    } else {
+      DE.Filename = PLoc.getFilename();
+      DE.Line = PLoc.getLine();
+      DE.Column = PLoc.getColumn();
+    }
+  }
+
+  // Record the diagnostic entry.
+  Entries.push_back(DE);
+}
+
diff --git a/contrib/libs/clang14/lib/Frontend/ModuleDependencyCollector.cpp b/contrib/libs/clang14/lib/Frontend/ModuleDependencyCollector.cpp
new file mode 100644
index 0000000000..4301e49f1d
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ModuleDependencyCollector.cpp
@@ -0,0 +1,200 @@
+//===--- ModuleDependencyCollector.cpp - Collect module dependencies ------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Collect the dependencies of a set of modules.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Basic/CharInfo.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Serialization/ASTReader.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+
+namespace {
+/// Private implementations for ModuleDependencyCollector
+class ModuleDependencyListener : public ASTReaderListener {
+  ModuleDependencyCollector &Collector;
+public:
+  ModuleDependencyListener(ModuleDependencyCollector &Collector)
+      : Collector(Collector) {}
+  bool needsInputFileVisitation() override { return true; }
+  bool needsSystemInputFileVisitation() override { return true; }
+  bool visitInputFile(StringRef Filename, bool IsSystem, bool IsOverridden,
+                      bool IsExplicitModule) override {
+    Collector.addFile(Filename);
+    return true;
+  }
+};
+
+struct ModuleDependencyPPCallbacks : public PPCallbacks {
+  ModuleDependencyCollector &Collector;
+  SourceManager &SM;
+  ModuleDependencyPPCallbacks(ModuleDependencyCollector &Collector,
+                              SourceManager &SM)
+      : Collector(Collector), SM(SM) {}
+
+  void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
+                          StringRef FileName, bool IsAngled,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          StringRef SearchPath, StringRef RelativePath,
+                          const Module *Imported,
+                          SrcMgr::CharacteristicKind FileType) override {
+    if (!File)
+      return;
+    Collector.addFile(File->getName());
+  }
+};
+
+struct ModuleDependencyMMCallbacks : public ModuleMapCallbacks {
+  ModuleDependencyCollector &Collector;
+  ModuleDependencyMMCallbacks(ModuleDependencyCollector &Collector)
+      : Collector(Collector) {}
+
+  void moduleMapAddHeader(StringRef HeaderPath) override {
+    if (llvm::sys::path::is_absolute(HeaderPath))
+      Collector.addFile(HeaderPath);
+  }
+  void moduleMapAddUmbrellaHeader(FileManager *FileMgr,
+                                  const FileEntry *Header) override {
+    StringRef HeaderFilename = Header->getName();
+    moduleMapAddHeader(HeaderFilename);
+    // The FileManager can find and cache the symbolic link for a framework
+    // header before its real path, this means a module can have some of its
+    // headers to use other paths. Although this is usually not a problem, it's
+    // inconsistent, and not collecting the original path header leads to
+    // umbrella clashes while rebuilding modules in the crash reproducer. For
+    // example:
+    //    ApplicationServices.framework/Frameworks/ImageIO.framework/ImageIO.h
+    // instead of:
+    //    ImageIO.framework/ImageIO.h
+    //
+    // FIXME: this shouldn't be necessary once we have FileName instances
+    // around instead of FileEntry ones. For now, make sure we collect all
+    // that we need for the reproducer to work correctly.
+    StringRef UmbreallDirFromHeader =
+        llvm::sys::path::parent_path(HeaderFilename);
+    StringRef UmbrellaDir = Header->getDir()->getName();
+    if (!UmbrellaDir.equals(UmbreallDirFromHeader)) {
+      SmallString<128> AltHeaderFilename;
+      llvm::sys::path::append(AltHeaderFilename, UmbrellaDir,
+                              llvm::sys::path::filename(HeaderFilename));
+      if (FileMgr->getFile(AltHeaderFilename))
+        moduleMapAddHeader(AltHeaderFilename);
+    }
+  }
+};
+
+}
+
+void ModuleDependencyCollector::attachToASTReader(ASTReader &R) {
+  R.addListener(std::make_unique<ModuleDependencyListener>(*this));
+}
+
+void ModuleDependencyCollector::attachToPreprocessor(Preprocessor &PP) {
+  PP.addPPCallbacks(std::make_unique<ModuleDependencyPPCallbacks>(
+      *this, PP.getSourceManager()));
+  PP.getHeaderSearchInfo().getModuleMap().addModuleMapCallbacks(
+      std::make_unique<ModuleDependencyMMCallbacks>(*this));
+}
+
+static bool isCaseSensitivePath(StringRef Path) {
+  SmallString<256> TmpDest = Path, UpperDest, RealDest;
+  // Remove component traversals, links, etc.
+  if (llvm::sys::fs::real_path(Path, TmpDest))
+    return true; // Current default value in vfs.yaml
+  Path = TmpDest;
+
+  // Change path to all upper case and ask for its real path, if the latter
+  // exists and is equal to Path, it's not case sensitive. Default to case
+  // sensitive in the absence of realpath, since this is what the VFSWriter
+  // already expects when sensitivity isn't setup.
+  for (auto &C : Path)
+    UpperDest.push_back(toUppercase(C));
+  if (!llvm::sys::fs::real_path(UpperDest, RealDest) && Path.equals(RealDest))
+    return false;
+  return true;
+}
+
+void ModuleDependencyCollector::writeFileMap() {
+  if (Seen.empty())
+    return;
+
+  StringRef VFSDir = getDest();
+
+  // Default to use relative overlay directories in the VFS yaml file. This
+  // allows crash reproducer scripts to work across machines.
+  VFSWriter.setOverlayDir(VFSDir);
+
+  // Explicitly set case sensitivity for the YAML writer. For that, find out
+  // the sensitivity at the path where the headers all collected to.
+  VFSWriter.setCaseSensitivity(isCaseSensitivePath(VFSDir));
+
+  // Do not rely on real path names when executing the crash reproducer scripts
+  // since we only want to actually use the files we have on the VFS cache.
+  VFSWriter.setUseExternalNames(false);
+
+  std::error_code EC;
+  SmallString<256> YAMLPath = VFSDir;
+  llvm::sys::path::append(YAMLPath, "vfs.yaml");
+  llvm::raw_fd_ostream OS(YAMLPath, EC, llvm::sys::fs::OF_TextWithCRLF);
+  if (EC) {
+    HasErrors = true;
+    return;
+  }
+  VFSWriter.write(OS);
+}
+
+std::error_code ModuleDependencyCollector::copyToRoot(StringRef Src,
+                                                      StringRef Dst) {
+  using namespace llvm::sys;
+  llvm::FileCollector::PathCanonicalizer::PathStorage Paths =
+      Canonicalizer.canonicalize(Src);
+
+  SmallString<256> CacheDst = getDest();
+
+  if (Dst.empty()) {
+    // The common case is to map the virtual path to the same path inside the
+    // cache.
+    path::append(CacheDst, path::relative_path(Paths.CopyFrom));
+  } else {
+    // When collecting entries from input vfsoverlays, copy the external
+    // contents into the cache but still map from the source.
+    if (!fs::exists(Dst))
+      return std::error_code();
+    path::append(CacheDst, Dst);
+    Paths.CopyFrom = Dst;
+  }
+
+  // Copy the file into place.
+  if (std::error_code EC = fs::create_directories(path::parent_path(CacheDst),
+                                                  /*IgnoreExisting=*/true))
+    return EC;
+  if (std::error_code EC = fs::copy_file(Paths.CopyFrom, CacheDst))
+    return EC;
+
+  // Always map a canonical src path to its real path into the YAML, by doing
+  // this we map different virtual src paths to the same entry in the VFS
+  // overlay, which is a way to emulate symlink inside the VFS; this is also
+  // needed for correctness, not doing that can lead to module redefinition
+  // errors.
+  addFileMapping(Paths.VirtualPath, CacheDst);
+  return std::error_code();
+}
+
+void ModuleDependencyCollector::addFile(StringRef Filename, StringRef FileDst) {
+  if (insertSeen(Filename))
+    if (copyToRoot(Filename, FileDst))
+      HasErrors = true;
+}
diff --git a/contrib/libs/clang14/lib/Frontend/MultiplexConsumer.cpp b/contrib/libs/clang14/lib/Frontend/MultiplexConsumer.cpp
new file mode 100644
index 0000000000..34bbc365e6
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/MultiplexConsumer.cpp
@@ -0,0 +1,370 @@
+//===- MultiplexConsumer.cpp - AST Consumer for PCH Generation --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the MultiplexConsumer class. It also declares and defines
+//  MultiplexASTDeserializationListener and  MultiplexASTMutationListener, which
+//  are implementation details of MultiplexConsumer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/MultiplexConsumer.h"
+#include "clang/AST/ASTMutationListener.h"
+#include "clang/AST/DeclGroup.h"
+
+using namespace clang;
+
+namespace clang {
+
+MultiplexASTDeserializationListener::MultiplexASTDeserializationListener(
+      const std::vector<ASTDeserializationListener*>& L)
+    : Listeners(L) {
+}
+
+void MultiplexASTDeserializationListener::ReaderInitialized(
+    ASTReader *Reader) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->ReaderInitialized(Reader);
+}
+
+void MultiplexASTDeserializationListener::IdentifierRead(
+    serialization::IdentID ID, IdentifierInfo *II) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->IdentifierRead(ID, II);
+}
+
+void MultiplexASTDeserializationListener::MacroRead(
+    serialization::MacroID ID, MacroInfo *MI) {
+  for (auto &Listener : Listeners)
+    Listener->MacroRead(ID, MI);
+}
+
+void MultiplexASTDeserializationListener::TypeRead(
+    serialization::TypeIdx Idx, QualType T) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->TypeRead(Idx, T);
+}
+
+void MultiplexASTDeserializationListener::DeclRead(
+    serialization::DeclID ID, const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeclRead(ID, D);
+}
+
+void MultiplexASTDeserializationListener::SelectorRead(
+    serialization::SelectorID ID, Selector Sel) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->SelectorRead(ID, Sel);
+}
+
+void MultiplexASTDeserializationListener::MacroDefinitionRead(
+    serialization::PreprocessedEntityID ID, MacroDefinitionRecord *MD) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->MacroDefinitionRead(ID, MD);
+}
+
+void MultiplexASTDeserializationListener::ModuleRead(
+    serialization::SubmoduleID ID, Module *Mod) {
+  for (auto &Listener : Listeners)
+    Listener->ModuleRead(ID, Mod);
+}
+
+// This ASTMutationListener forwards its notifications to a set of
+// child listeners.
+class MultiplexASTMutationListener : public ASTMutationListener {
+public:
+  // Does NOT take ownership of the elements in L.
+  MultiplexASTMutationListener(ArrayRef<ASTMutationListener*> L);
+  void CompletedTagDefinition(const TagDecl *D) override;
+  void AddedVisibleDecl(const DeclContext *DC, const Decl *D) override;
+  void AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) override;
+  void AddedCXXTemplateSpecialization(const ClassTemplateDecl *TD,
+                            const ClassTemplateSpecializationDecl *D) override;
+  void AddedCXXTemplateSpecialization(const VarTemplateDecl *TD,
+                               const VarTemplateSpecializationDecl *D) override;
+  void AddedCXXTemplateSpecialization(const FunctionTemplateDecl *TD,
+                                      const FunctionDecl *D) override;
+  void ResolvedExceptionSpec(const FunctionDecl *FD) override;
+  void DeducedReturnType(const FunctionDecl *FD, QualType ReturnType) override;
+  void ResolvedOperatorDelete(const CXXDestructorDecl *DD,
+                              const FunctionDecl *Delete,
+                              Expr *ThisArg) override;
+  void CompletedImplicitDefinition(const FunctionDecl *D) override;
+  void InstantiationRequested(const ValueDecl *D) override;
+  void VariableDefinitionInstantiated(const VarDecl *D) override;
+  void FunctionDefinitionInstantiated(const FunctionDecl *D) override;
+  void DefaultArgumentInstantiated(const ParmVarDecl *D) override;
+  void DefaultMemberInitializerInstantiated(const FieldDecl *D) override;
+  void AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
+                                    const ObjCInterfaceDecl *IFD) override;
+  void DeclarationMarkedUsed(const Decl *D) override;
+  void DeclarationMarkedOpenMPThreadPrivate(const Decl *D) override;
+  void DeclarationMarkedOpenMPAllocate(const Decl *D, const Attr *A) override;
+  void DeclarationMarkedOpenMPDeclareTarget(const Decl *D,
+                                            const Attr *Attr) override;
+  void RedefinedHiddenDefinition(const NamedDecl *D, Module *M) override;
+  void AddedAttributeToRecord(const Attr *Attr,
+                              const RecordDecl *Record) override;
+
+private:
+  std::vector<ASTMutationListener*> Listeners;
+};
+
+MultiplexASTMutationListener::MultiplexASTMutationListener(
+    ArrayRef<ASTMutationListener*> L)
+    : Listeners(L.begin(), L.end()) {
+}
+
+void MultiplexASTMutationListener::CompletedTagDefinition(const TagDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->CompletedTagDefinition(D);
+}
+
+void MultiplexASTMutationListener::AddedVisibleDecl(
+    const DeclContext *DC, const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedVisibleDecl(DC, D);
+}
+
+void MultiplexASTMutationListener::AddedCXXImplicitMember(
+    const CXXRecordDecl *RD, const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXImplicitMember(RD, D);
+}
+void MultiplexASTMutationListener::AddedCXXTemplateSpecialization(
+    const ClassTemplateDecl *TD, const ClassTemplateSpecializationDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXTemplateSpecialization(TD, D);
+}
+void MultiplexASTMutationListener::AddedCXXTemplateSpecialization(
+    const VarTemplateDecl *TD, const VarTemplateSpecializationDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXTemplateSpecialization(TD, D);
+}
+void MultiplexASTMutationListener::AddedCXXTemplateSpecialization(
+    const FunctionTemplateDecl *TD, const FunctionDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedCXXTemplateSpecialization(TD, D);
+}
+void MultiplexASTMutationListener::ResolvedExceptionSpec(
+    const FunctionDecl *FD) {
+  for (auto &Listener : Listeners)
+    Listener->ResolvedExceptionSpec(FD);
+}
+void MultiplexASTMutationListener::DeducedReturnType(const FunctionDecl *FD,
+                                                     QualType ReturnType) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeducedReturnType(FD, ReturnType);
+}
+void MultiplexASTMutationListener::ResolvedOperatorDelete(
+    const CXXDestructorDecl *DD, const FunctionDecl *Delete, Expr *ThisArg) {
+  for (auto *L : Listeners)
+    L->ResolvedOperatorDelete(DD, Delete, ThisArg);
+}
+void MultiplexASTMutationListener::CompletedImplicitDefinition(
+                                                        const FunctionDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->CompletedImplicitDefinition(D);
+}
+void MultiplexASTMutationListener::InstantiationRequested(const ValueDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->InstantiationRequested(D);
+}
+void MultiplexASTMutationListener::VariableDefinitionInstantiated(
+    const VarDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->VariableDefinitionInstantiated(D);
+}
+void MultiplexASTMutationListener::FunctionDefinitionInstantiated(
+    const FunctionDecl *D) {
+  for (auto &Listener : Listeners)
+    Listener->FunctionDefinitionInstantiated(D);
+}
+void MultiplexASTMutationListener::DefaultArgumentInstantiated(
+                                                         const ParmVarDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DefaultArgumentInstantiated(D);
+}
+void MultiplexASTMutationListener::DefaultMemberInitializerInstantiated(
+                                                           const FieldDecl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DefaultMemberInitializerInstantiated(D);
+}
+void MultiplexASTMutationListener::AddedObjCCategoryToInterface(
+                                                 const ObjCCategoryDecl *CatD,
+                                                 const ObjCInterfaceDecl *IFD) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->AddedObjCCategoryToInterface(CatD, IFD);
+}
+void MultiplexASTMutationListener::DeclarationMarkedUsed(const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeclarationMarkedUsed(D);
+}
+void MultiplexASTMutationListener::DeclarationMarkedOpenMPThreadPrivate(
+    const Decl *D) {
+  for (size_t i = 0, e = Listeners.size(); i != e; ++i)
+    Listeners[i]->DeclarationMarkedOpenMPThreadPrivate(D);
+}
+void MultiplexASTMutationListener::DeclarationMarkedOpenMPAllocate(
+    const Decl *D, const Attr *A) {
+  for (ASTMutationListener *L : Listeners)
+    L->DeclarationMarkedOpenMPAllocate(D, A);
+}
+void MultiplexASTMutationListener::DeclarationMarkedOpenMPDeclareTarget(
+    const Decl *D, const Attr *Attr) {
+  for (auto *L : Listeners)
+    L->DeclarationMarkedOpenMPDeclareTarget(D, Attr);
+}
+void MultiplexASTMutationListener::RedefinedHiddenDefinition(const NamedDecl *D,
+                                                             Module *M) {
+  for (auto *L : Listeners)
+    L->RedefinedHiddenDefinition(D, M);
+}
+
+void MultiplexASTMutationListener::AddedAttributeToRecord(
+                                                    const Attr *Attr,
+                                                    const RecordDecl *Record) {
+  for (auto *L : Listeners)
+    L->AddedAttributeToRecord(Attr, Record);
+}
+
+}  // end namespace clang
+
+MultiplexConsumer::MultiplexConsumer(
+    std::vector<std::unique_ptr<ASTConsumer>> C)
+    : Consumers(std::move(C)) {
+  // Collect the mutation listeners and deserialization listeners of all
+  // children, and create a multiplex listener each if so.
+  std::vector<ASTMutationListener *> mutationListeners;
+  std::vector<ASTDeserializationListener*> serializationListeners;
+  for (auto &Consumer : Consumers) {
+    if (auto *mutationListener = Consumer->GetASTMutationListener())
+      mutationListeners.push_back(mutationListener);
+    if (auto *serializationListener = Consumer->GetASTDeserializationListener())
+      serializationListeners.push_back(serializationListener);
+  }
+  if (!mutationListeners.empty()) {
+    MutationListener =
+        std::make_unique<MultiplexASTMutationListener>(mutationListeners);
+  }
+  if (!serializationListeners.empty()) {
+    DeserializationListener =
+        std::make_unique<MultiplexASTDeserializationListener>(
+            serializationListeners);
+  }
+}
+
+MultiplexConsumer::~MultiplexConsumer() {}
+
+void MultiplexConsumer::Initialize(ASTContext &Context) {
+  for (auto &Consumer : Consumers)
+    Consumer->Initialize(Context);
+}
+
+bool MultiplexConsumer::HandleTopLevelDecl(DeclGroupRef D) {
+  bool Continue = true;
+  for (auto &Consumer : Consumers)
+    Continue = Continue && Consumer->HandleTopLevelDecl(D);
+  return Continue;
+}
+
+void MultiplexConsumer::HandleInlineFunctionDefinition(FunctionDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleInlineFunctionDefinition(D);
+}
+
+void MultiplexConsumer::HandleCXXStaticMemberVarInstantiation(VarDecl *VD) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleCXXStaticMemberVarInstantiation(VD);
+}
+
+void MultiplexConsumer::HandleInterestingDecl(DeclGroupRef D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleInterestingDecl(D);
+}
+
+void MultiplexConsumer::HandleTranslationUnit(ASTContext &Ctx) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTranslationUnit(Ctx);
+}
+
+void MultiplexConsumer::HandleTagDeclDefinition(TagDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTagDeclDefinition(D);
+}
+
+void MultiplexConsumer::HandleTagDeclRequiredDefinition(const TagDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTagDeclRequiredDefinition(D);
+}
+
+void MultiplexConsumer::HandleCXXImplicitFunctionInstantiation(FunctionDecl *D){
+  for (auto &Consumer : Consumers)
+    Consumer->HandleCXXImplicitFunctionInstantiation(D);
+}
+
+void MultiplexConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleTopLevelDeclInObjCContainer(D);
+}
+
+void MultiplexConsumer::HandleImplicitImportDecl(ImportDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleImplicitImportDecl(D);
+}
+
+void MultiplexConsumer::CompleteTentativeDefinition(VarDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->CompleteTentativeDefinition(D);
+}
+
+void MultiplexConsumer::CompleteExternalDeclaration(VarDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->CompleteExternalDeclaration(D);
+}
+
+void MultiplexConsumer::AssignInheritanceModel(CXXRecordDecl *RD) {
+  for (auto &Consumer : Consumers)
+    Consumer->AssignInheritanceModel(RD);
+}
+
+void MultiplexConsumer::HandleVTable(CXXRecordDecl *RD) {
+  for (auto &Consumer : Consumers)
+    Consumer->HandleVTable(RD);
+}
+
+ASTMutationListener *MultiplexConsumer::GetASTMutationListener() {
+  return MutationListener.get();
+}
+
+ASTDeserializationListener *MultiplexConsumer::GetASTDeserializationListener() {
+  return DeserializationListener.get();
+}
+
+void MultiplexConsumer::PrintStats() {
+  for (auto &Consumer : Consumers)
+    Consumer->PrintStats();
+}
+
+bool MultiplexConsumer::shouldSkipFunctionBody(Decl *D) {
+  bool Skip = true;
+  for (auto &Consumer : Consumers)
+    Skip = Skip && Consumer->shouldSkipFunctionBody(D);
+  return Skip;
+}
+
+void MultiplexConsumer::InitializeSema(Sema &S) {
+  for (auto &Consumer : Consumers)
+    if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Consumer.get()))
+      SC->InitializeSema(S);
+}
+
+void MultiplexConsumer::ForgetSema() {
+  for (auto &Consumer : Consumers)
+    if (SemaConsumer *SC = dyn_cast<SemaConsumer>(Consumer.get()))
+      SC->ForgetSema();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/PrecompiledPreamble.cpp b/contrib/libs/clang14/lib/Frontend/PrecompiledPreamble.cpp
new file mode 100644
index 0000000000..8aa80a4c96
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/PrecompiledPreamble.cpp
@@ -0,0 +1,885 @@
+//===--- PrecompiledPreamble.cpp - Build precompiled preambles --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Helper class to build precompiled preamble.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/PrecompiledPreamble.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/CompilerInvocation.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/FrontendOptions.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Serialization/ASTWriter.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Support/CrashRecoveryContext.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include <limits>
+#include <mutex>
+#include <utility>
+
+using namespace clang;
+
+namespace {
+
+StringRef getInMemoryPreamblePath() {
+#if defined(LLVM_ON_UNIX)
+  return "/__clang_tmp/___clang_inmemory_preamble___";
+#elif defined(_WIN32)
+  return "C:\\__clang_tmp\\___clang_inmemory_preamble___";
+#else
+#warning "Unknown platform. Defaulting to UNIX-style paths for in-memory PCHs"
+  return "/__clang_tmp/___clang_inmemory_preamble___";
+#endif
+}
+
+IntrusiveRefCntPtr<llvm::vfs::FileSystem>
+createVFSOverlayForPreamblePCH(StringRef PCHFilename,
+                               std::unique_ptr<llvm::MemoryBuffer> PCHBuffer,
+                               IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
+  // We want only the PCH file from the real filesystem to be available,
+  // so we create an in-memory VFS with just that and overlay it on top.
+  IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> PCHFS(
+      new llvm::vfs::InMemoryFileSystem());
+  PCHFS->addFile(PCHFilename, 0, std::move(PCHBuffer));
+  IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> Overlay(
+      new llvm::vfs::OverlayFileSystem(VFS));
+  Overlay->pushOverlay(PCHFS);
+  return Overlay;
+}
+
+class PreambleDependencyCollector : public DependencyCollector {
+public:
+  // We want to collect all dependencies for correctness. Avoiding the real
+  // system dependencies (e.g. stl from /usr/lib) would probably be a good idea,
+  // but there is no way to distinguish between those and the ones that can be
+  // spuriously added by '-isystem' (e.g. to suppress warnings from those
+  // headers).
+  bool needSystemDependencies() override { return true; }
+};
+
+// Collects files whose existence would invalidate the preamble.
+// Collecting *all* of these would make validating it too slow though, so we
+// just find all the candidates for 'file not found' diagnostics.
+//
+// A caveat that may be significant for generated files: we'll omit files under
+// search path entries whose roots don't exist when the preamble is built.
+// These are pruned by InitHeaderSearch and so we don't see the search path.
+// It would be nice to include them but we don't want to duplicate all the rest
+// of the InitHeaderSearch logic to reconstruct them.
+class MissingFileCollector : public PPCallbacks {
+  llvm::StringSet<> &Out;
+  const HeaderSearch &Search;
+  const SourceManager &SM;
+
+public:
+  MissingFileCollector(llvm::StringSet<> &Out, const HeaderSearch &Search,
+                       const SourceManager &SM)
+      : Out(Out), Search(Search), SM(SM) {}
+
+  void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
+                          StringRef FileName, bool IsAngled,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          StringRef SearchPath, StringRef RelativePath,
+                          const Module *Imported,
+                          SrcMgr::CharacteristicKind FileType) override {
+    // File is null if it wasn't found.
+    // (We have some false negatives if PP recovered e.g. <foo> -> "foo")
+    if (File != nullptr)
+      return;
+
+    // If it's a rare absolute include, we know the full path already.
+    if (llvm::sys::path::is_absolute(FileName)) {
+      Out.insert(FileName);
+      return;
+    }
+
+    // Reconstruct the filenames that would satisfy this directive...
+    llvm::SmallString<256> Buf;
+    auto NotFoundRelativeTo = [&](const DirectoryEntry *DE) {
+      Buf = DE->getName();
+      llvm::sys::path::append(Buf, FileName);
+      llvm::sys::path::remove_dots(Buf, /*remove_dot_dot=*/true);
+      Out.insert(Buf);
+    };
+    // ...relative to the including file.
+    if (!IsAngled) {
+      if (const FileEntry *IncludingFile =
+              SM.getFileEntryForID(SM.getFileID(IncludeTok.getLocation())))
+        if (IncludingFile->getDir())
+          NotFoundRelativeTo(IncludingFile->getDir());
+    }
+    // ...relative to the search paths.
+    for (const auto &Dir : llvm::make_range(
+             IsAngled ? Search.angled_dir_begin() : Search.search_dir_begin(),
+             Search.search_dir_end())) {
+      // No support for frameworks or header maps yet.
+      if (Dir.isNormalDir())
+        NotFoundRelativeTo(Dir.getDir());
+    }
+  }
+};
+
+/// Keeps a track of files to be deleted in destructor.
+class TemporaryFiles {
+public:
+  // A static instance to be used by all clients.
+  static TemporaryFiles &getInstance();
+
+private:
+  // Disallow constructing the class directly.
+  TemporaryFiles() = default;
+  // Disallow copy.
+  TemporaryFiles(const TemporaryFiles &) = delete;
+
+public:
+  ~TemporaryFiles();
+
+  /// Adds \p File to a set of tracked files.
+  void addFile(StringRef File);
+
+  /// Remove \p File from disk and from the set of tracked files.
+  void removeFile(StringRef File);
+
+private:
+  std::mutex Mutex;
+  llvm::StringSet<> Files;
+};
+
+TemporaryFiles &TemporaryFiles::getInstance() {
+  static TemporaryFiles Instance;
+  return Instance;
+}
+
+TemporaryFiles::~TemporaryFiles() {
+  std::lock_guard<std::mutex> Guard(Mutex);
+  for (const auto &File : Files)
+    llvm::sys::fs::remove(File.getKey());
+}
+
+void TemporaryFiles::addFile(StringRef File) {
+  std::lock_guard<std::mutex> Guard(Mutex);
+  auto IsInserted = Files.insert(File).second;
+  (void)IsInserted;
+  assert(IsInserted && "File has already been added");
+}
+
+void TemporaryFiles::removeFile(StringRef File) {
+  std::lock_guard<std::mutex> Guard(Mutex);
+  auto WasPresent = Files.erase(File);
+  (void)WasPresent;
+  assert(WasPresent && "File was not tracked");
+  llvm::sys::fs::remove(File);
+}
+
+class PrecompilePreambleAction : public ASTFrontendAction {
+public:
+  PrecompilePreambleAction(std::string *InMemStorage,
+                           PreambleCallbacks &Callbacks)
+      : InMemStorage(InMemStorage), Callbacks(Callbacks) {}
+
+  std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
+                                                 StringRef InFile) override;
+
+  bool hasEmittedPreamblePCH() const { return HasEmittedPreamblePCH; }
+
+  void setEmittedPreamblePCH(ASTWriter &Writer) {
+    this->HasEmittedPreamblePCH = true;
+    Callbacks.AfterPCHEmitted(Writer);
+  }
+
+  bool BeginSourceFileAction(CompilerInstance &CI) override {
+    assert(CI.getLangOpts().CompilingPCH);
+    return ASTFrontendAction::BeginSourceFileAction(CI);
+  }
+
+  bool shouldEraseOutputFiles() override { return !hasEmittedPreamblePCH(); }
+  bool hasCodeCompletionSupport() const override { return false; }
+  bool hasASTFileSupport() const override { return false; }
+  TranslationUnitKind getTranslationUnitKind() override { return TU_Prefix; }
+
+private:
+  friend class PrecompilePreambleConsumer;
+
+  bool HasEmittedPreamblePCH = false;
+  std::string *InMemStorage;
+  PreambleCallbacks &Callbacks;
+};
+
+class PrecompilePreambleConsumer : public PCHGenerator {
+public:
+  PrecompilePreambleConsumer(PrecompilePreambleAction &Action,
+                             const Preprocessor &PP,
+                             InMemoryModuleCache &ModuleCache,
+                             StringRef isysroot,
+                             std::unique_ptr<raw_ostream> Out)
+      : PCHGenerator(PP, ModuleCache, "", isysroot,
+                     std::make_shared<PCHBuffer>(),
+                     ArrayRef<std::shared_ptr<ModuleFileExtension>>(),
+                     /*AllowASTWithErrors=*/true),
+        Action(Action), Out(std::move(Out)) {}
+
+  bool HandleTopLevelDecl(DeclGroupRef DG) override {
+    Action.Callbacks.HandleTopLevelDecl(DG);
+    return true;
+  }
+
+  void HandleTranslationUnit(ASTContext &Ctx) override {
+    PCHGenerator::HandleTranslationUnit(Ctx);
+    if (!hasEmittedPCH())
+      return;
+
+    // Write the generated bitstream to "Out".
+    *Out << getPCH();
+    // Make sure it hits disk now.
+    Out->flush();
+    // Free the buffer.
+    llvm::SmallVector<char, 0> Empty;
+    getPCH() = std::move(Empty);
+
+    Action.setEmittedPreamblePCH(getWriter());
+  }
+
+  bool shouldSkipFunctionBody(Decl *D) override {
+    return Action.Callbacks.shouldSkipFunctionBody(D);
+  }
+
+private:
+  PrecompilePreambleAction &Action;
+  std::unique_ptr<raw_ostream> Out;
+};
+
+std::unique_ptr<ASTConsumer>
+PrecompilePreambleAction::CreateASTConsumer(CompilerInstance &CI,
+                                            StringRef InFile) {
+  std::string Sysroot;
+  if (!GeneratePCHAction::ComputeASTConsumerArguments(CI, Sysroot))
+    return nullptr;
+
+  std::unique_ptr<llvm::raw_ostream> OS;
+  if (InMemStorage) {
+    OS = std::make_unique<llvm::raw_string_ostream>(*InMemStorage);
+  } else {
+    std::string OutputFile;
+    OS = GeneratePCHAction::CreateOutputFile(CI, InFile, OutputFile);
+  }
+  if (!OS)
+    return nullptr;
+
+  if (!CI.getFrontendOpts().RelocatablePCH)
+    Sysroot.clear();
+
+  return std::make_unique<PrecompilePreambleConsumer>(
+      *this, CI.getPreprocessor(), CI.getModuleCache(), Sysroot, std::move(OS));
+}
+
+template <class T> bool moveOnNoError(llvm::ErrorOr<T> Val, T &Output) {
+  if (!Val)
+    return false;
+  Output = std::move(*Val);
+  return true;
+}
+
+} // namespace
+
+PreambleBounds clang::ComputePreambleBounds(const LangOptions &LangOpts,
+                                            const llvm::MemoryBufferRef &Buffer,
+                                            unsigned MaxLines) {
+  return Lexer::ComputePreamble(Buffer.getBuffer(), LangOpts, MaxLines);
+}
+
+llvm::ErrorOr<PrecompiledPreamble> PrecompiledPreamble::Build(
+    const CompilerInvocation &Invocation,
+    const llvm::MemoryBuffer *MainFileBuffer, PreambleBounds Bounds,
+    DiagnosticsEngine &Diagnostics,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS,
+    std::shared_ptr<PCHContainerOperations> PCHContainerOps, bool StoreInMemory,
+    PreambleCallbacks &Callbacks) {
+  assert(VFS && "VFS is null");
+
+  auto PreambleInvocation = std::make_shared<CompilerInvocation>(Invocation);
+  FrontendOptions &FrontendOpts = PreambleInvocation->getFrontendOpts();
+  PreprocessorOptions &PreprocessorOpts =
+      PreambleInvocation->getPreprocessorOpts();
+
+  llvm::Optional<TempPCHFile> TempFile;
+  if (!StoreInMemory) {
+    // Create a temporary file for the precompiled preamble. In rare
+    // circumstances, this can fail.
+    llvm::ErrorOr<PrecompiledPreamble::TempPCHFile> PreamblePCHFile =
+        PrecompiledPreamble::TempPCHFile::CreateNewPreamblePCHFile();
+    if (!PreamblePCHFile)
+      return BuildPreambleError::CouldntCreateTempFile;
+    TempFile = std::move(*PreamblePCHFile);
+  }
+
+  PCHStorage Storage = StoreInMemory ? PCHStorage(InMemoryPreamble())
+                                     : PCHStorage(std::move(*TempFile));
+
+  // Save the preamble text for later; we'll need to compare against it for
+  // subsequent reparses.
+  std::vector<char> PreambleBytes(MainFileBuffer->getBufferStart(),
+                                  MainFileBuffer->getBufferStart() +
+                                      Bounds.Size);
+  bool PreambleEndsAtStartOfLine = Bounds.PreambleEndsAtStartOfLine;
+
+  // Tell the compiler invocation to generate a temporary precompiled header.
+  FrontendOpts.ProgramAction = frontend::GeneratePCH;
+  FrontendOpts.OutputFile =
+      std::string(StoreInMemory ? getInMemoryPreamblePath()
+                                : Storage.asFile().getFilePath());
+  PreprocessorOpts.PrecompiledPreambleBytes.first = 0;
+  PreprocessorOpts.PrecompiledPreambleBytes.second = false;
+  // Inform preprocessor to record conditional stack when building the preamble.
+  PreprocessorOpts.GeneratePreamble = true;
+
+  // Create the compiler instance to use for building the precompiled preamble.
+  std::unique_ptr<CompilerInstance> Clang(
+      new CompilerInstance(std::move(PCHContainerOps)));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInstance> CICleanup(
+      Clang.get());
+
+  Clang->setInvocation(std::move(PreambleInvocation));
+  Clang->setDiagnostics(&Diagnostics);
+
+  // Create the target instance.
+  if (!Clang->createTarget())
+    return BuildPreambleError::CouldntCreateTargetInfo;
+
+  if (Clang->getFrontendOpts().Inputs.size() != 1 ||
+      Clang->getFrontendOpts().Inputs[0].getKind().getFormat() !=
+          InputKind::Source ||
+      Clang->getFrontendOpts().Inputs[0].getKind().getLanguage() ==
+          Language::LLVM_IR) {
+    return BuildPreambleError::BadInputs;
+  }
+
+  // Clear out old caches and data.
+  Diagnostics.Reset();
+  ProcessWarningOptions(Diagnostics, Clang->getDiagnosticOpts());
+
+  VFS =
+      createVFSFromCompilerInvocation(Clang->getInvocation(), Diagnostics, VFS);
+
+  // Create a file manager object to provide access to and cache the filesystem.
+  Clang->setFileManager(new FileManager(Clang->getFileSystemOpts(), VFS));
+
+  // Create the source manager.
+  Clang->setSourceManager(
+      new SourceManager(Diagnostics, Clang->getFileManager()));
+
+  auto PreambleDepCollector = std::make_shared<PreambleDependencyCollector>();
+  Clang->addDependencyCollector(PreambleDepCollector);
+
+  Clang->getLangOpts().CompilingPCH = true;
+
+  // Remap the main source file to the preamble buffer.
+  StringRef MainFilePath = FrontendOpts.Inputs[0].getFile();
+  auto PreambleInputBuffer = llvm::MemoryBuffer::getMemBufferCopy(
+      MainFileBuffer->getBuffer().slice(0, Bounds.Size), MainFilePath);
+  if (PreprocessorOpts.RetainRemappedFileBuffers) {
+    // MainFileBuffer will be deleted by unique_ptr after leaving the method.
+    PreprocessorOpts.addRemappedFile(MainFilePath, PreambleInputBuffer.get());
+  } else {
+    // In that case, remapped buffer will be deleted by CompilerInstance on
+    // BeginSourceFile, so we call release() to avoid double deletion.
+    PreprocessorOpts.addRemappedFile(MainFilePath,
+                                     PreambleInputBuffer.release());
+  }
+
+  std::unique_ptr<PrecompilePreambleAction> Act;
+  Act.reset(new PrecompilePreambleAction(
+      StoreInMemory ? &Storage.asMemory().Data : nullptr, Callbacks));
+  if (!Act->BeginSourceFile(*Clang.get(), Clang->getFrontendOpts().Inputs[0]))
+    return BuildPreambleError::BeginSourceFileFailed;
+
+  // Performed after BeginSourceFile to ensure Clang->Preprocessor can be
+  // referenced in the callback.
+  Callbacks.BeforeExecute(*Clang);
+
+  std::unique_ptr<PPCallbacks> DelegatedPPCallbacks =
+      Callbacks.createPPCallbacks();
+  if (DelegatedPPCallbacks)
+    Clang->getPreprocessor().addPPCallbacks(std::move(DelegatedPPCallbacks));
+  if (auto CommentHandler = Callbacks.getCommentHandler())
+    Clang->getPreprocessor().addCommentHandler(CommentHandler);
+  llvm::StringSet<> MissingFiles;
+  Clang->getPreprocessor().addPPCallbacks(
+      std::make_unique<MissingFileCollector>(
+          MissingFiles, Clang->getPreprocessor().getHeaderSearchInfo(),
+          Clang->getSourceManager()));
+
+  if (llvm::Error Err = Act->Execute())
+    return errorToErrorCode(std::move(Err));
+
+  // Run the callbacks.
+  Callbacks.AfterExecute(*Clang);
+
+  Act->EndSourceFile();
+
+  if (!Act->hasEmittedPreamblePCH())
+    return BuildPreambleError::CouldntEmitPCH;
+
+  // Keep track of all of the files that the source manager knows about,
+  // so we can verify whether they have changed or not.
+  llvm::StringMap<PrecompiledPreamble::PreambleFileHash> FilesInPreamble;
+
+  SourceManager &SourceMgr = Clang->getSourceManager();
+  for (auto &Filename : PreambleDepCollector->getDependencies()) {
+    auto FileOrErr = Clang->getFileManager().getFile(Filename);
+    if (!FileOrErr ||
+        *FileOrErr == SourceMgr.getFileEntryForID(SourceMgr.getMainFileID()))
+      continue;
+    auto File = *FileOrErr;
+    if (time_t ModTime = File->getModificationTime()) {
+      FilesInPreamble[File->getName()] =
+          PrecompiledPreamble::PreambleFileHash::createForFile(File->getSize(),
+                                                               ModTime);
+    } else {
+      llvm::MemoryBufferRef Buffer =
+          SourceMgr.getMemoryBufferForFileOrFake(File);
+      FilesInPreamble[File->getName()] =
+          PrecompiledPreamble::PreambleFileHash::createForMemoryBuffer(Buffer);
+    }
+  }
+
+  return PrecompiledPreamble(
+      std::move(Storage), std::move(PreambleBytes), PreambleEndsAtStartOfLine,
+      std::move(FilesInPreamble), std::move(MissingFiles));
+}
+
+PreambleBounds PrecompiledPreamble::getBounds() const {
+  return PreambleBounds(PreambleBytes.size(), PreambleEndsAtStartOfLine);
+}
+
+std::size_t PrecompiledPreamble::getSize() const {
+  switch (Storage.getKind()) {
+  case PCHStorage::Kind::Empty:
+    assert(false && "Calling getSize() on invalid PrecompiledPreamble. "
+                    "Was it std::moved?");
+    return 0;
+  case PCHStorage::Kind::InMemory:
+    return Storage.asMemory().Data.size();
+  case PCHStorage::Kind::TempFile: {
+    uint64_t Result;
+    if (llvm::sys::fs::file_size(Storage.asFile().getFilePath(), Result))
+      return 0;
+
+    assert(Result <= std::numeric_limits<std::size_t>::max() &&
+           "file size did not fit into size_t");
+    return Result;
+  }
+  }
+  llvm_unreachable("Unhandled storage kind");
+}
+
+bool PrecompiledPreamble::CanReuse(const CompilerInvocation &Invocation,
+                                   const llvm::MemoryBufferRef &MainFileBuffer,
+                                   PreambleBounds Bounds,
+                                   llvm::vfs::FileSystem &VFS) const {
+
+  assert(
+      Bounds.Size <= MainFileBuffer.getBufferSize() &&
+      "Buffer is too large. Bounds were calculated from a different buffer?");
+
+  auto PreambleInvocation = std::make_shared<CompilerInvocation>(Invocation);
+  PreprocessorOptions &PreprocessorOpts =
+      PreambleInvocation->getPreprocessorOpts();
+
+  // We've previously computed a preamble. Check whether we have the same
+  // preamble now that we did before, and that there's enough space in
+  // the main-file buffer within the precompiled preamble to fit the
+  // new main file.
+  if (PreambleBytes.size() != Bounds.Size ||
+      PreambleEndsAtStartOfLine != Bounds.PreambleEndsAtStartOfLine ||
+      !std::equal(PreambleBytes.begin(), PreambleBytes.end(),
+                  MainFileBuffer.getBuffer().begin()))
+    return false;
+  // The preamble has not changed. We may be able to re-use the precompiled
+  // preamble.
+
+  // Check that none of the files used by the preamble have changed.
+  // First, make a record of those files that have been overridden via
+  // remapping or unsaved_files.
+  std::map<llvm::sys::fs::UniqueID, PreambleFileHash> OverriddenFiles;
+  llvm::StringSet<> OverriddenAbsPaths; // Either by buffers or files.
+  for (const auto &R : PreprocessorOpts.RemappedFiles) {
+    llvm::vfs::Status Status;
+    if (!moveOnNoError(VFS.status(R.second), Status)) {
+      // If we can't stat the file we're remapping to, assume that something
+      // horrible happened.
+      return false;
+    }
+    // If a mapped file was previously missing, then it has changed.
+    llvm::SmallString<128> MappedPath(R.first);
+    if (!VFS.makeAbsolute(MappedPath))
+      OverriddenAbsPaths.insert(MappedPath);
+
+    OverriddenFiles[Status.getUniqueID()] = PreambleFileHash::createForFile(
+        Status.getSize(), llvm::sys::toTimeT(Status.getLastModificationTime()));
+  }
+
+  // OverridenFileBuffers tracks only the files not found in VFS.
+  llvm::StringMap<PreambleFileHash> OverridenFileBuffers;
+  for (const auto &RB : PreprocessorOpts.RemappedFileBuffers) {
+    const PrecompiledPreamble::PreambleFileHash PreambleHash =
+        PreambleFileHash::createForMemoryBuffer(RB.second->getMemBufferRef());
+    llvm::vfs::Status Status;
+    if (moveOnNoError(VFS.status(RB.first), Status))
+      OverriddenFiles[Status.getUniqueID()] = PreambleHash;
+    else
+      OverridenFileBuffers[RB.first] = PreambleHash;
+
+    llvm::SmallString<128> MappedPath(RB.first);
+    if (!VFS.makeAbsolute(MappedPath))
+      OverriddenAbsPaths.insert(MappedPath);
+  }
+
+  // Check whether anything has changed.
+  for (const auto &F : FilesInPreamble) {
+    auto OverridenFileBuffer = OverridenFileBuffers.find(F.first());
+    if (OverridenFileBuffer != OverridenFileBuffers.end()) {
+      // The file's buffer was remapped and the file was not found in VFS.
+      // Check whether it matches up with the previous mapping.
+      if (OverridenFileBuffer->second != F.second)
+        return false;
+      continue;
+    }
+
+    llvm::vfs::Status Status;
+    if (!moveOnNoError(VFS.status(F.first()), Status)) {
+      // If the file's buffer is not remapped and we can't stat it,
+      // assume that something horrible happened.
+      return false;
+    }
+
+    std::map<llvm::sys::fs::UniqueID, PreambleFileHash>::iterator Overridden =
+        OverriddenFiles.find(Status.getUniqueID());
+    if (Overridden != OverriddenFiles.end()) {
+      // This file was remapped; check whether the newly-mapped file
+      // matches up with the previous mapping.
+      if (Overridden->second != F.second)
+        return false;
+      continue;
+    }
+
+    // Neither the file's buffer nor the file itself was remapped;
+    // check whether it has changed on disk.
+    if (Status.getSize() != uint64_t(F.second.Size) ||
+        llvm::sys::toTimeT(Status.getLastModificationTime()) !=
+            F.second.ModTime)
+      return false;
+  }
+  for (const auto &F : MissingFiles) {
+    // A missing file may be "provided" by an override buffer or file.
+    if (OverriddenAbsPaths.count(F.getKey()))
+      return false;
+    // If a file previously recorded as missing exists as a regular file, then
+    // consider the preamble out-of-date.
+    if (auto Status = VFS.status(F.getKey())) {
+      if (Status->isRegularFile())
+        return false;
+    }
+  }
+  return true;
+}
+
+void PrecompiledPreamble::AddImplicitPreamble(
+    CompilerInvocation &CI, IntrusiveRefCntPtr<llvm::vfs::FileSystem> &VFS,
+    llvm::MemoryBuffer *MainFileBuffer) const {
+  PreambleBounds Bounds(PreambleBytes.size(), PreambleEndsAtStartOfLine);
+  configurePreamble(Bounds, CI, VFS, MainFileBuffer);
+}
+
+void PrecompiledPreamble::OverridePreamble(
+    CompilerInvocation &CI, IntrusiveRefCntPtr<llvm::vfs::FileSystem> &VFS,
+    llvm::MemoryBuffer *MainFileBuffer) const {
+  auto Bounds = ComputePreambleBounds(*CI.getLangOpts(), *MainFileBuffer, 0);
+  configurePreamble(Bounds, CI, VFS, MainFileBuffer);
+}
+
+PrecompiledPreamble::PrecompiledPreamble(
+    PCHStorage Storage, std::vector<char> PreambleBytes,
+    bool PreambleEndsAtStartOfLine,
+    llvm::StringMap<PreambleFileHash> FilesInPreamble,
+    llvm::StringSet<> MissingFiles)
+    : Storage(std::move(Storage)), FilesInPreamble(std::move(FilesInPreamble)),
+      MissingFiles(std::move(MissingFiles)),
+      PreambleBytes(std::move(PreambleBytes)),
+      PreambleEndsAtStartOfLine(PreambleEndsAtStartOfLine) {
+  assert(this->Storage.getKind() != PCHStorage::Kind::Empty);
+}
+
+llvm::ErrorOr<PrecompiledPreamble::TempPCHFile>
+PrecompiledPreamble::TempPCHFile::CreateNewPreamblePCHFile() {
+  // FIXME: This is a hack so that we can override the preamble file during
+  // crash-recovery testing, which is the only case where the preamble files
+  // are not necessarily cleaned up.
+  if (const char *TmpFile = ::getenv("CINDEXTEST_PREAMBLE_FILE"))
+    return TempPCHFile(TmpFile);
+
+  llvm::SmallString<64> File;
+  // Using a version of createTemporaryFile with a file descriptor guarantees
+  // that we would never get a race condition in a multi-threaded setting
+  // (i.e., multiple threads getting the same temporary path).
+  int FD;
+  auto EC = llvm::sys::fs::createTemporaryFile("preamble", "pch", FD, File);
+  if (EC)
+    return EC;
+  // We only needed to make sure the file exists, close the file right away.
+  llvm::sys::Process::SafelyCloseFileDescriptor(FD);
+  return TempPCHFile(std::string(std::move(File).str()));
+}
+
+PrecompiledPreamble::TempPCHFile::TempPCHFile(std::string FilePath)
+    : FilePath(std::move(FilePath)) {
+  TemporaryFiles::getInstance().addFile(*this->FilePath);
+}
+
+PrecompiledPreamble::TempPCHFile::TempPCHFile(TempPCHFile &&Other) {
+  FilePath = std::move(Other.FilePath);
+  Other.FilePath = None;
+}
+
+PrecompiledPreamble::TempPCHFile &PrecompiledPreamble::TempPCHFile::
+operator=(TempPCHFile &&Other) {
+  RemoveFileIfPresent();
+
+  FilePath = std::move(Other.FilePath);
+  Other.FilePath = None;
+  return *this;
+}
+
+PrecompiledPreamble::TempPCHFile::~TempPCHFile() { RemoveFileIfPresent(); }
+
+void PrecompiledPreamble::TempPCHFile::RemoveFileIfPresent() {
+  if (FilePath) {
+    TemporaryFiles::getInstance().removeFile(*FilePath);
+    FilePath = None;
+  }
+}
+
+llvm::StringRef PrecompiledPreamble::TempPCHFile::getFilePath() const {
+  assert(FilePath && "TempPCHFile doesn't have a FilePath. Had it been moved?");
+  return *FilePath;
+}
+
+PrecompiledPreamble::PCHStorage::PCHStorage(TempPCHFile File)
+    : StorageKind(Kind::TempFile) {
+  new (&asFile()) TempPCHFile(std::move(File));
+}
+
+PrecompiledPreamble::PCHStorage::PCHStorage(InMemoryPreamble Memory)
+    : StorageKind(Kind::InMemory) {
+  new (&asMemory()) InMemoryPreamble(std::move(Memory));
+}
+
+PrecompiledPreamble::PCHStorage::PCHStorage(PCHStorage &&Other) : PCHStorage() {
+  *this = std::move(Other);
+}
+
+PrecompiledPreamble::PCHStorage &PrecompiledPreamble::PCHStorage::
+operator=(PCHStorage &&Other) {
+  destroy();
+
+  StorageKind = Other.StorageKind;
+  switch (StorageKind) {
+  case Kind::Empty:
+    // do nothing;
+    break;
+  case Kind::TempFile:
+    new (&asFile()) TempPCHFile(std::move(Other.asFile()));
+    break;
+  case Kind::InMemory:
+    new (&asMemory()) InMemoryPreamble(std::move(Other.asMemory()));
+    break;
+  }
+
+  Other.setEmpty();
+  return *this;
+}
+
+PrecompiledPreamble::PCHStorage::~PCHStorage() { destroy(); }
+
+PrecompiledPreamble::PCHStorage::Kind
+PrecompiledPreamble::PCHStorage::getKind() const {
+  return StorageKind;
+}
+
+PrecompiledPreamble::TempPCHFile &PrecompiledPreamble::PCHStorage::asFile() {
+  assert(getKind() == Kind::TempFile);
+  return *reinterpret_cast<TempPCHFile *>(&Storage);
+}
+
+const PrecompiledPreamble::TempPCHFile &
+PrecompiledPreamble::PCHStorage::asFile() const {
+  return const_cast<PCHStorage *>(this)->asFile();
+}
+
+PrecompiledPreamble::InMemoryPreamble &
+PrecompiledPreamble::PCHStorage::asMemory() {
+  assert(getKind() == Kind::InMemory);
+  return *reinterpret_cast<InMemoryPreamble *>(&Storage);
+}
+
+const PrecompiledPreamble::InMemoryPreamble &
+PrecompiledPreamble::PCHStorage::asMemory() const {
+  return const_cast<PCHStorage *>(this)->asMemory();
+}
+
+void PrecompiledPreamble::PCHStorage::destroy() {
+  switch (StorageKind) {
+  case Kind::Empty:
+    return;
+  case Kind::TempFile:
+    asFile().~TempPCHFile();
+    return;
+  case Kind::InMemory:
+    asMemory().~InMemoryPreamble();
+    return;
+  }
+}
+
+void PrecompiledPreamble::PCHStorage::setEmpty() {
+  destroy();
+  StorageKind = Kind::Empty;
+}
+
+PrecompiledPreamble::PreambleFileHash
+PrecompiledPreamble::PreambleFileHash::createForFile(off_t Size,
+                                                     time_t ModTime) {
+  PreambleFileHash Result;
+  Result.Size = Size;
+  Result.ModTime = ModTime;
+  Result.MD5 = {};
+  return Result;
+}
+
+PrecompiledPreamble::PreambleFileHash
+PrecompiledPreamble::PreambleFileHash::createForMemoryBuffer(
+    const llvm::MemoryBufferRef &Buffer) {
+  PreambleFileHash Result;
+  Result.Size = Buffer.getBufferSize();
+  Result.ModTime = 0;
+
+  llvm::MD5 MD5Ctx;
+  MD5Ctx.update(Buffer.getBuffer().data());
+  MD5Ctx.final(Result.MD5);
+
+  return Result;
+}
+
+void PrecompiledPreamble::configurePreamble(
+    PreambleBounds Bounds, CompilerInvocation &CI,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> &VFS,
+    llvm::MemoryBuffer *MainFileBuffer) const {
+  assert(VFS);
+
+  auto &PreprocessorOpts = CI.getPreprocessorOpts();
+
+  // Remap main file to point to MainFileBuffer.
+  auto MainFilePath = CI.getFrontendOpts().Inputs[0].getFile();
+  PreprocessorOpts.addRemappedFile(MainFilePath, MainFileBuffer);
+
+  // Configure ImpicitPCHInclude.
+  PreprocessorOpts.PrecompiledPreambleBytes.first = Bounds.Size;
+  PreprocessorOpts.PrecompiledPreambleBytes.second =
+      Bounds.PreambleEndsAtStartOfLine;
+  PreprocessorOpts.DisablePCHOrModuleValidation =
+      DisableValidationForModuleKind::PCH;
+
+  setupPreambleStorage(Storage, PreprocessorOpts, VFS);
+}
+
+void PrecompiledPreamble::setupPreambleStorage(
+    const PCHStorage &Storage, PreprocessorOptions &PreprocessorOpts,
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> &VFS) {
+  if (Storage.getKind() == PCHStorage::Kind::TempFile) {
+    const TempPCHFile &PCHFile = Storage.asFile();
+    PreprocessorOpts.ImplicitPCHInclude = std::string(PCHFile.getFilePath());
+
+    // Make sure we can access the PCH file even if we're using a VFS
+    IntrusiveRefCntPtr<llvm::vfs::FileSystem> RealFS =
+        llvm::vfs::getRealFileSystem();
+    auto PCHPath = PCHFile.getFilePath();
+    if (VFS == RealFS || VFS->exists(PCHPath))
+      return;
+    auto Buf = RealFS->getBufferForFile(PCHPath);
+    if (!Buf) {
+      // We can't read the file even from RealFS, this is clearly an error,
+      // but we'll just leave the current VFS as is and let clang's code
+      // figure out what to do with missing PCH.
+      return;
+    }
+
+    // We have a slight inconsistency here -- we're using the VFS to
+    // read files, but the PCH was generated in the real file system.
+    VFS = createVFSOverlayForPreamblePCH(PCHPath, std::move(*Buf), VFS);
+  } else {
+    assert(Storage.getKind() == PCHStorage::Kind::InMemory);
+    // For in-memory preamble, we have to provide a VFS overlay that makes it
+    // accessible.
+    StringRef PCHPath = getInMemoryPreamblePath();
+    PreprocessorOpts.ImplicitPCHInclude = std::string(PCHPath);
+
+    auto Buf = llvm::MemoryBuffer::getMemBuffer(Storage.asMemory().Data);
+    VFS = createVFSOverlayForPreamblePCH(PCHPath, std::move(Buf), VFS);
+  }
+}
+
+void PreambleCallbacks::BeforeExecute(CompilerInstance &CI) {}
+void PreambleCallbacks::AfterExecute(CompilerInstance &CI) {}
+void PreambleCallbacks::AfterPCHEmitted(ASTWriter &Writer) {}
+void PreambleCallbacks::HandleTopLevelDecl(DeclGroupRef DG) {}
+std::unique_ptr<PPCallbacks> PreambleCallbacks::createPPCallbacks() {
+  return nullptr;
+}
+CommentHandler *PreambleCallbacks::getCommentHandler() { return nullptr; }
+
+static llvm::ManagedStatic<BuildPreambleErrorCategory> BuildPreambleErrCategory;
+
+std::error_code clang::make_error_code(BuildPreambleError Error) {
+  return std::error_code(static_cast<int>(Error), *BuildPreambleErrCategory);
+}
+
+const char *BuildPreambleErrorCategory::name() const noexcept {
+  return "build-preamble.error";
+}
+
+std::string BuildPreambleErrorCategory::message(int condition) const {
+  switch (static_cast<BuildPreambleError>(condition)) {
+  case BuildPreambleError::CouldntCreateTempFile:
+    return "Could not create temporary file for PCH";
+  case BuildPreambleError::CouldntCreateTargetInfo:
+    return "CreateTargetInfo() return null";
+  case BuildPreambleError::BeginSourceFileFailed:
+    return "BeginSourceFile() return an error";
+  case BuildPreambleError::CouldntEmitPCH:
+    return "Could not emit PCH";
+  case BuildPreambleError::BadInputs:
+    return "Command line arguments must contain exactly one source file";
+  }
+  llvm_unreachable("unexpected BuildPreambleError");
+}
diff --git a/contrib/libs/clang14/lib/Frontend/PrintPreprocessedOutput.cpp b/contrib/libs/clang14/lib/Frontend/PrintPreprocessedOutput.cpp
new file mode 100644
index 0000000000..1d0022bda4
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -0,0 +1,1026 @@
+//===--- PrintPreprocessedOutput.cpp - Implement the -E mode --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This code simply runs the preprocessor on the input file and prints out the
+// result.  This is the traditional behavior of the -E option.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/Utils.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/PreprocessorOutputOptions.h"
+#include "clang/Lex/MacroInfo.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Pragma.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/TokenConcatenation.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdio>
+using namespace clang;
+
+/// PrintMacroDefinition - Print a macro definition in a form that will be
+/// properly accepted back as a definition.
+static void PrintMacroDefinition(const IdentifierInfo &II, const MacroInfo &MI,
+                                 Preprocessor &PP, raw_ostream &OS) {
+  OS << "#define " << II.getName();
+
+  if (MI.isFunctionLike()) {
+    OS << '(';
+    if (!MI.param_empty()) {
+      MacroInfo::param_iterator AI = MI.param_begin(), E = MI.param_end();
+      for (; AI+1 != E; ++AI) {
+        OS << (*AI)->getName();
+        OS << ',';
+      }
+
+      // Last argument.
+      if ((*AI)->getName() == "__VA_ARGS__")
+        OS << "...";
+      else
+        OS << (*AI)->getName();
+    }
+
+    if (MI.isGNUVarargs())
+      OS << "...";  // #define foo(x...)
+
+    OS << ')';
+  }
+
+  // GCC always emits a space, even if the macro body is empty.  However, do not
+  // want to emit two spaces if the first token has a leading space.
+  if (MI.tokens_empty() || !MI.tokens_begin()->hasLeadingSpace())
+    OS << ' ';
+
+  SmallString<128> SpellingBuffer;
+  for (const auto &T : MI.tokens()) {
+    if (T.hasLeadingSpace())
+      OS << ' ';
+
+    OS << PP.getSpelling(T, SpellingBuffer);
+  }
+}
+
+//===----------------------------------------------------------------------===//
+// Preprocessed token printer
+//===----------------------------------------------------------------------===//
+
+namespace {
+class PrintPPOutputPPCallbacks : public PPCallbacks {
+  Preprocessor &PP;
+  SourceManager &SM;
+  TokenConcatenation ConcatInfo;
+public:
+  raw_ostream &OS;
+private:
+  unsigned CurLine;
+
+  bool EmittedTokensOnThisLine;
+  bool EmittedDirectiveOnThisLine;
+  SrcMgr::CharacteristicKind FileType;
+  SmallString<512> CurFilename;
+  bool Initialized;
+  bool DisableLineMarkers;
+  bool DumpDefines;
+  bool DumpIncludeDirectives;
+  bool UseLineDirectives;
+  bool IsFirstFileEntered;
+  bool MinimizeWhitespace;
+
+  Token PrevTok;
+  Token PrevPrevTok;
+
+public:
+  PrintPPOutputPPCallbacks(Preprocessor &pp, raw_ostream &os, bool lineMarkers,
+                           bool defines, bool DumpIncludeDirectives,
+                           bool UseLineDirectives, bool MinimizeWhitespace)
+      : PP(pp), SM(PP.getSourceManager()), ConcatInfo(PP), OS(os),
+        DisableLineMarkers(lineMarkers), DumpDefines(defines),
+        DumpIncludeDirectives(DumpIncludeDirectives),
+        UseLineDirectives(UseLineDirectives),
+        MinimizeWhitespace(MinimizeWhitespace) {
+    CurLine = 0;
+    CurFilename += "<uninit>";
+    EmittedTokensOnThisLine = false;
+    EmittedDirectiveOnThisLine = false;
+    FileType = SrcMgr::C_User;
+    Initialized = false;
+    IsFirstFileEntered = false;
+
+    PrevTok.startToken();
+    PrevPrevTok.startToken();
+  }
+
+  bool isMinimizeWhitespace() const { return MinimizeWhitespace; }
+
+  void setEmittedTokensOnThisLine() { EmittedTokensOnThisLine = true; }
+  bool hasEmittedTokensOnThisLine() const { return EmittedTokensOnThisLine; }
+
+  void setEmittedDirectiveOnThisLine() { EmittedDirectiveOnThisLine = true; }
+  bool hasEmittedDirectiveOnThisLine() const {
+    return EmittedDirectiveOnThisLine;
+  }
+
+  /// Ensure that the output stream position is at the beginning of a new line
+  /// and inserts one if it does not. It is intended to ensure that directives
+  /// inserted by the directives not from the input source (such as #line) are
+  /// in the first column. To insert newlines that represent the input, use
+  /// MoveToLine(/*...*/, /*RequireStartOfLine=*/true).
+  void startNewLineIfNeeded();
+
+  void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                   SrcMgr::CharacteristicKind FileType,
+                   FileID PrevFID) override;
+  void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
+                          StringRef FileName, bool IsAngled,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          StringRef SearchPath, StringRef RelativePath,
+                          const Module *Imported,
+                          SrcMgr::CharacteristicKind FileType) override;
+  void Ident(SourceLocation Loc, StringRef str) override;
+  void PragmaMessage(SourceLocation Loc, StringRef Namespace,
+                     PragmaMessageKind Kind, StringRef Str) override;
+  void PragmaDebug(SourceLocation Loc, StringRef DebugType) override;
+  void PragmaDiagnosticPush(SourceLocation Loc, StringRef Namespace) override;
+  void PragmaDiagnosticPop(SourceLocation Loc, StringRef Namespace) override;
+  void PragmaDiagnostic(SourceLocation Loc, StringRef Namespace,
+                        diag::Severity Map, StringRef Str) override;
+  void PragmaWarning(SourceLocation Loc, PragmaWarningSpecifier WarningSpec,
+                     ArrayRef<int> Ids) override;
+  void PragmaWarningPush(SourceLocation Loc, int Level) override;
+  void PragmaWarningPop(SourceLocation Loc) override;
+  void PragmaExecCharsetPush(SourceLocation Loc, StringRef Str) override;
+  void PragmaExecCharsetPop(SourceLocation Loc) override;
+  void PragmaAssumeNonNullBegin(SourceLocation Loc) override;
+  void PragmaAssumeNonNullEnd(SourceLocation Loc) override;
+
+  /// Insert whitespace before emitting the next token.
+  ///
+  /// @param Tok             Next token to be emitted.
+  /// @param RequireSpace    Ensure at least one whitespace is emitted. Useful
+  ///                        if non-tokens have been emitted to the stream.
+  /// @param RequireSameLine Never emit newlines. Useful when semantics depend
+  ///                        on being on the same line, such as directives.
+  void HandleWhitespaceBeforeTok(const Token &Tok, bool RequireSpace,
+                                 bool RequireSameLine);
+
+  /// Move to the line of the provided source location. This will
+  /// return true if a newline was inserted or if
+  /// the requested location is the first token on the first line.
+  /// In these cases the next output will be the first column on the line and
+  /// make it possible to insert indention. The newline was inserted
+  /// implicitly when at the beginning of the file.
+  ///
+  /// @param Tok                 Token where to move to.
+  /// @param RequireStartOfLine  Whether the next line depends on being in the
+  ///                            first column, such as a directive.
+  ///
+  /// @return Whether column adjustments are necessary.
+  bool MoveToLine(const Token &Tok, bool RequireStartOfLine) {
+    PresumedLoc PLoc = SM.getPresumedLoc(Tok.getLocation());
+    unsigned TargetLine = PLoc.isValid() ? PLoc.getLine() : CurLine;
+    bool IsFirstInFile = Tok.isAtStartOfLine() && PLoc.getLine() == 1;
+    return MoveToLine(TargetLine, RequireStartOfLine) || IsFirstInFile;
+  }
+
+  /// Move to the line of the provided source location. Returns true if a new
+  /// line was inserted.
+  bool MoveToLine(SourceLocation Loc, bool RequireStartOfLine) {
+    PresumedLoc PLoc = SM.getPresumedLoc(Loc);
+    unsigned TargetLine = PLoc.isValid() ? PLoc.getLine() : CurLine;
+    return MoveToLine(TargetLine, RequireStartOfLine);
+  }
+  bool MoveToLine(unsigned LineNo, bool RequireStartOfLine);
+
+  bool AvoidConcat(const Token &PrevPrevTok, const Token &PrevTok,
+                   const Token &Tok) {
+    return ConcatInfo.AvoidConcat(PrevPrevTok, PrevTok, Tok);
+  }
+  void WriteLineInfo(unsigned LineNo, const char *Extra=nullptr,
+                     unsigned ExtraLen=0);
+  bool LineMarkersAreDisabled() const { return DisableLineMarkers; }
+  void HandleNewlinesInToken(const char *TokStr, unsigned Len);
+
+  /// MacroDefined - This hook is called whenever a macro definition is seen.
+  void MacroDefined(const Token &MacroNameTok,
+                    const MacroDirective *MD) override;
+
+  /// MacroUndefined - This hook is called whenever a macro #undef is seen.
+  void MacroUndefined(const Token &MacroNameTok,
+                      const MacroDefinition &MD,
+                      const MacroDirective *Undef) override;
+
+  void BeginModule(const Module *M);
+  void EndModule(const Module *M);
+};
+}  // end anonymous namespace
+
+void PrintPPOutputPPCallbacks::WriteLineInfo(unsigned LineNo,
+                                             const char *Extra,
+                                             unsigned ExtraLen) {
+  startNewLineIfNeeded();
+
+  // Emit #line directives or GNU line markers depending on what mode we're in.
+  if (UseLineDirectives) {
+    OS << "#line" << ' ' << LineNo << ' ' << '"';
+    OS.write_escaped(CurFilename);
+    OS << '"';
+  } else {
+    OS << '#' << ' ' << LineNo << ' ' << '"';
+    OS.write_escaped(CurFilename);
+    OS << '"';
+
+    if (ExtraLen)
+      OS.write(Extra, ExtraLen);
+
+    if (FileType == SrcMgr::C_System)
+      OS.write(" 3", 2);
+    else if (FileType == SrcMgr::C_ExternCSystem)
+      OS.write(" 3 4", 4);
+  }
+  OS << '\n';
+}
+
+/// MoveToLine - Move the output to the source line specified by the location
+/// object.  We can do this by emitting some number of \n's, or be emitting a
+/// #line directive.  This returns false if already at the specified line, true
+/// if some newlines were emitted.
+bool PrintPPOutputPPCallbacks::MoveToLine(unsigned LineNo,
+                                          bool RequireStartOfLine) {
+  // If it is required to start a new line or finish the current, insert
+  // vertical whitespace now and take it into account when moving to the
+  // expected line.
+  bool StartedNewLine = false;
+  if ((RequireStartOfLine && EmittedTokensOnThisLine) ||
+      EmittedDirectiveOnThisLine) {
+    OS << '\n';
+    StartedNewLine = true;
+    CurLine += 1;
+    EmittedTokensOnThisLine = false;
+    EmittedDirectiveOnThisLine = false;
+  }
+
+  // If this line is "close enough" to the original line, just print newlines,
+  // otherwise print a #line directive.
+  if (CurLine == LineNo) {
+    // Nothing to do if we are already on the correct line.
+  } else if (MinimizeWhitespace && DisableLineMarkers) {
+    // With -E -P -fminimize-whitespace, don't emit anything if not necessary.
+  } else if (!StartedNewLine && LineNo - CurLine == 1) {
+    // Printing a single line has priority over printing a #line directive, even
+    // when minimizing whitespace which otherwise would print #line directives
+    // for every single line.
+    OS << '\n';
+    StartedNewLine = true;
+  } else if (!DisableLineMarkers) {
+    if (LineNo - CurLine <= 8) {
+      const char *NewLines = "\n\n\n\n\n\n\n\n";
+      OS.write(NewLines, LineNo - CurLine);
+    } else {
+      // Emit a #line or line marker.
+      WriteLineInfo(LineNo, nullptr, 0);
+    }
+    StartedNewLine = true;
+  } else if (EmittedTokensOnThisLine) {
+    // If we are not on the correct line and don't need to be line-correct,
+    // at least ensure we start on a new line.
+    OS << '\n';
+    StartedNewLine = true;
+  }
+
+  if (StartedNewLine) {
+    EmittedTokensOnThisLine = false;
+    EmittedDirectiveOnThisLine = false;
+  }
+
+  CurLine = LineNo;
+  return StartedNewLine;
+}
+
+void PrintPPOutputPPCallbacks::startNewLineIfNeeded() {
+  if (EmittedTokensOnThisLine || EmittedDirectiveOnThisLine) {
+    OS << '\n';
+    EmittedTokensOnThisLine = false;
+    EmittedDirectiveOnThisLine = false;
+  }
+}
+
+/// FileChanged - Whenever the preprocessor enters or exits a #include file
+/// it invokes this handler.  Update our conception of the current source
+/// position.
+void PrintPPOutputPPCallbacks::FileChanged(SourceLocation Loc,
+                                           FileChangeReason Reason,
+                                       SrcMgr::CharacteristicKind NewFileType,
+                                       FileID PrevFID) {
+  // Unless we are exiting a #include, make sure to skip ahead to the line the
+  // #include directive was at.
+  SourceManager &SourceMgr = SM;
+
+  PresumedLoc UserLoc = SourceMgr.getPresumedLoc(Loc);
+  if (UserLoc.isInvalid())
+    return;
+
+  unsigned NewLine = UserLoc.getLine();
+
+  if (Reason == PPCallbacks::EnterFile) {
+    SourceLocation IncludeLoc = UserLoc.getIncludeLoc();
+    if (IncludeLoc.isValid())
+      MoveToLine(IncludeLoc, /*RequireStartOfLine=*/false);
+  } else if (Reason == PPCallbacks::SystemHeaderPragma) {
+    // GCC emits the # directive for this directive on the line AFTER the
+    // directive and emits a bunch of spaces that aren't needed. This is because
+    // otherwise we will emit a line marker for THIS line, which requires an
+    // extra blank line after the directive to avoid making all following lines
+    // off by one. We can do better by simply incrementing NewLine here.
+    NewLine += 1;
+  }
+
+  CurLine = NewLine;
+
+  CurFilename.clear();
+  CurFilename += UserLoc.getFilename();
+  FileType = NewFileType;
+
+  if (DisableLineMarkers) {
+    if (!MinimizeWhitespace)
+      startNewLineIfNeeded();
+    return;
+  }
+
+  if (!Initialized) {
+    WriteLineInfo(CurLine);
+    Initialized = true;
+  }
+
+  // Do not emit an enter marker for the main file (which we expect is the first
+  // entered file). This matches gcc, and improves compatibility with some tools
+  // which track the # line markers as a way to determine when the preprocessed
+  // output is in the context of the main file.
+  if (Reason == PPCallbacks::EnterFile && !IsFirstFileEntered) {
+    IsFirstFileEntered = true;
+    return;
+  }
+
+  switch (Reason) {
+  case PPCallbacks::EnterFile:
+    WriteLineInfo(CurLine, " 1", 2);
+    break;
+  case PPCallbacks::ExitFile:
+    WriteLineInfo(CurLine, " 2", 2);
+    break;
+  case PPCallbacks::SystemHeaderPragma:
+  case PPCallbacks::RenameFile:
+    WriteLineInfo(CurLine);
+    break;
+  }
+}
+
+void PrintPPOutputPPCallbacks::InclusionDirective(
+    SourceLocation HashLoc,
+    const Token &IncludeTok,
+    StringRef FileName,
+    bool IsAngled,
+    CharSourceRange FilenameRange,
+    const FileEntry *File,
+    StringRef SearchPath,
+    StringRef RelativePath,
+    const Module *Imported,
+    SrcMgr::CharacteristicKind FileType) {
+  // In -dI mode, dump #include directives prior to dumping their content or
+  // interpretation.
+  if (DumpIncludeDirectives) {
+    MoveToLine(HashLoc, /*RequireStartOfLine=*/true);
+    const std::string TokenText = PP.getSpelling(IncludeTok);
+    assert(!TokenText.empty());
+    OS << "#" << TokenText << " "
+       << (IsAngled ? '<' : '"') << FileName << (IsAngled ? '>' : '"')
+       << " /* clang -E -dI */";
+    setEmittedDirectiveOnThisLine();
+  }
+
+  // When preprocessing, turn implicit imports into module import pragmas.
+  if (Imported) {
+    switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) {
+    case tok::pp_include:
+    case tok::pp_import:
+    case tok::pp_include_next:
+      MoveToLine(HashLoc, /*RequireStartOfLine=*/true);
+      OS << "#pragma clang module import " << Imported->getFullModuleName(true)
+         << " /* clang -E: implicit import for "
+         << "#" << PP.getSpelling(IncludeTok) << " "
+         << (IsAngled ? '<' : '"') << FileName << (IsAngled ? '>' : '"')
+         << " */";
+      setEmittedDirectiveOnThisLine();
+      break;
+
+    case tok::pp___include_macros:
+      // #__include_macros has no effect on a user of a preprocessed source
+      // file; the only effect is on preprocessing.
+      //
+      // FIXME: That's not *quite* true: it causes the module in question to
+      // be loaded, which can affect downstream diagnostics.
+      break;
+
+    default:
+      llvm_unreachable("unknown include directive kind");
+      break;
+    }
+  }
+}
+
+/// Handle entering the scope of a module during a module compilation.
+void PrintPPOutputPPCallbacks::BeginModule(const Module *M) {
+  startNewLineIfNeeded();
+  OS << "#pragma clang module begin " << M->getFullModuleName(true);
+  setEmittedDirectiveOnThisLine();
+}
+
+/// Handle leaving the scope of a module during a module compilation.
+void PrintPPOutputPPCallbacks::EndModule(const Module *M) {
+  startNewLineIfNeeded();
+  OS << "#pragma clang module end /*" << M->getFullModuleName(true) << "*/";
+  setEmittedDirectiveOnThisLine();
+}
+
+/// Ident - Handle #ident directives when read by the preprocessor.
+///
+void PrintPPOutputPPCallbacks::Ident(SourceLocation Loc, StringRef S) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+
+  OS.write("#ident ", strlen("#ident "));
+  OS.write(S.begin(), S.size());
+  setEmittedTokensOnThisLine();
+}
+
+/// MacroDefined - This hook is called whenever a macro definition is seen.
+void PrintPPOutputPPCallbacks::MacroDefined(const Token &MacroNameTok,
+                                            const MacroDirective *MD) {
+  const MacroInfo *MI = MD->getMacroInfo();
+  // Only print out macro definitions in -dD mode.
+  if (!DumpDefines ||
+      // Ignore __FILE__ etc.
+      MI->isBuiltinMacro()) return;
+
+  MoveToLine(MI->getDefinitionLoc(), /*RequireStartOfLine=*/true);
+  PrintMacroDefinition(*MacroNameTok.getIdentifierInfo(), *MI, PP, OS);
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::MacroUndefined(const Token &MacroNameTok,
+                                              const MacroDefinition &MD,
+                                              const MacroDirective *Undef) {
+  // Only print out macro definitions in -dD mode.
+  if (!DumpDefines) return;
+
+  MoveToLine(MacroNameTok.getLocation(), /*RequireStartOfLine=*/true);
+  OS << "#undef " << MacroNameTok.getIdentifierInfo()->getName();
+  setEmittedDirectiveOnThisLine();
+}
+
+static void outputPrintable(raw_ostream &OS, StringRef Str) {
+  for (unsigned char Char : Str) {
+    if (isPrintable(Char) && Char != '\\' && Char != '"')
+      OS << (char)Char;
+    else // Output anything hard as an octal escape.
+      OS << '\\'
+         << (char)('0' + ((Char >> 6) & 7))
+         << (char)('0' + ((Char >> 3) & 7))
+         << (char)('0' + ((Char >> 0) & 7));
+  }
+}
+
+void PrintPPOutputPPCallbacks::PragmaMessage(SourceLocation Loc,
+                                             StringRef Namespace,
+                                             PragmaMessageKind Kind,
+                                             StringRef Str) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma ";
+  if (!Namespace.empty())
+    OS << Namespace << ' ';
+  switch (Kind) {
+    case PMK_Message:
+      OS << "message(\"";
+      break;
+    case PMK_Warning:
+      OS << "warning \"";
+      break;
+    case PMK_Error:
+      OS << "error \"";
+      break;
+  }
+
+  outputPrintable(OS, Str);
+  OS << '"';
+  if (Kind == PMK_Message)
+    OS << ')';
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaDebug(SourceLocation Loc,
+                                           StringRef DebugType) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+
+  OS << "#pragma clang __debug ";
+  OS << DebugType;
+
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::
+PragmaDiagnosticPush(SourceLocation Loc, StringRef Namespace) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma " << Namespace << " diagnostic push";
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::
+PragmaDiagnosticPop(SourceLocation Loc, StringRef Namespace) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma " << Namespace << " diagnostic pop";
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaDiagnostic(SourceLocation Loc,
+                                                StringRef Namespace,
+                                                diag::Severity Map,
+                                                StringRef Str) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma " << Namespace << " diagnostic ";
+  switch (Map) {
+  case diag::Severity::Remark:
+    OS << "remark";
+    break;
+  case diag::Severity::Warning:
+    OS << "warning";
+    break;
+  case diag::Severity::Error:
+    OS << "error";
+    break;
+  case diag::Severity::Ignored:
+    OS << "ignored";
+    break;
+  case diag::Severity::Fatal:
+    OS << "fatal";
+    break;
+  }
+  OS << " \"" << Str << '"';
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaWarning(SourceLocation Loc,
+                                             PragmaWarningSpecifier WarningSpec,
+                                             ArrayRef<int> Ids) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+
+  OS << "#pragma warning(";
+  switch(WarningSpec) {
+    case PWS_Default:  OS << "default"; break;
+    case PWS_Disable:  OS << "disable"; break;
+    case PWS_Error:    OS << "error"; break;
+    case PWS_Once:     OS << "once"; break;
+    case PWS_Suppress: OS << "suppress"; break;
+    case PWS_Level1:   OS << '1'; break;
+    case PWS_Level2:   OS << '2'; break;
+    case PWS_Level3:   OS << '3'; break;
+    case PWS_Level4:   OS << '4'; break;
+  }
+  OS << ':';
+
+  for (ArrayRef<int>::iterator I = Ids.begin(), E = Ids.end(); I != E; ++I)
+    OS << ' ' << *I;
+  OS << ')';
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaWarningPush(SourceLocation Loc,
+                                                 int Level) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma warning(push";
+  if (Level >= 0)
+    OS << ", " << Level;
+  OS << ')';
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaWarningPop(SourceLocation Loc) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma warning(pop)";
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaExecCharsetPush(SourceLocation Loc,
+                                                     StringRef Str) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma character_execution_set(push";
+  if (!Str.empty())
+    OS << ", " << Str;
+  OS << ')';
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::PragmaExecCharsetPop(SourceLocation Loc) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma character_execution_set(pop)";
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::
+PragmaAssumeNonNullBegin(SourceLocation Loc) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma clang assume_nonnull begin";
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::
+PragmaAssumeNonNullEnd(SourceLocation Loc) {
+  MoveToLine(Loc, /*RequireStartOfLine=*/true);
+  OS << "#pragma clang assume_nonnull end";
+  setEmittedDirectiveOnThisLine();
+}
+
+void PrintPPOutputPPCallbacks::HandleWhitespaceBeforeTok(const Token &Tok,
+                                                         bool RequireSpace,
+                                                         bool RequireSameLine) {
+  // These tokens are not expanded to anything and don't need whitespace before
+  // them.
+  if (Tok.is(tok::eof) ||
+      (Tok.isAnnotation() && !Tok.is(tok::annot_header_unit) &&
+       !Tok.is(tok::annot_module_begin) && !Tok.is(tok::annot_module_end)))
+    return;
+
+  // EmittedDirectiveOnThisLine takes priority over RequireSameLine.
+  if ((!RequireSameLine || EmittedDirectiveOnThisLine) &&
+      MoveToLine(Tok, /*RequireStartOfLine=*/EmittedDirectiveOnThisLine)) {
+    if (MinimizeWhitespace) {
+      // Avoid interpreting hash as a directive under -fpreprocessed.
+      if (Tok.is(tok::hash))
+        OS << ' ';
+    } else {
+      // Print out space characters so that the first token on a line is
+      // indented for easy reading.
+      unsigned ColNo = SM.getExpansionColumnNumber(Tok.getLocation());
+
+      // The first token on a line can have a column number of 1, yet still
+      // expect leading white space, if a macro expansion in column 1 starts
+      // with an empty macro argument, or an empty nested macro expansion. In
+      // this case, move the token to column 2.
+      if (ColNo == 1 && Tok.hasLeadingSpace())
+        ColNo = 2;
+
+      // This hack prevents stuff like:
+      // #define HASH #
+      // HASH define foo bar
+      // From having the # character end up at column 1, which makes it so it
+      // is not handled as a #define next time through the preprocessor if in
+      // -fpreprocessed mode.
+      if (ColNo <= 1 && Tok.is(tok::hash))
+        OS << ' ';
+
+      // Otherwise, indent the appropriate number of spaces.
+      for (; ColNo > 1; --ColNo)
+        OS << ' ';
+    }
+  } else {
+    // Insert whitespace between the previous and next token if either
+    // - The caller requires it
+    // - The input had whitespace between them and we are not in
+    //   whitespace-minimization mode
+    // - The whitespace is necessary to keep the tokens apart and there is not
+    //   already a newline between them
+    if (RequireSpace || (!MinimizeWhitespace && Tok.hasLeadingSpace()) ||
+        ((EmittedTokensOnThisLine || EmittedDirectiveOnThisLine) &&
+         AvoidConcat(PrevPrevTok, PrevTok, Tok)))
+      OS << ' ';
+  }
+
+  PrevPrevTok = PrevTok;
+  PrevTok = Tok;
+}
+
+void PrintPPOutputPPCallbacks::HandleNewlinesInToken(const char *TokStr,
+                                                     unsigned Len) {
+  unsigned NumNewlines = 0;
+  for (; Len; --Len, ++TokStr) {
+    if (*TokStr != '\n' &&
+        *TokStr != '\r')
+      continue;
+
+    ++NumNewlines;
+
+    // If we have \n\r or \r\n, skip both and count as one line.
+    if (Len != 1 &&
+        (TokStr[1] == '\n' || TokStr[1] == '\r') &&
+        TokStr[0] != TokStr[1]) {
+      ++TokStr;
+      --Len;
+    }
+  }
+
+  if (NumNewlines == 0) return;
+
+  CurLine += NumNewlines;
+}
+
+
+namespace {
+struct UnknownPragmaHandler : public PragmaHandler {
+  const char *Prefix;
+  PrintPPOutputPPCallbacks *Callbacks;
+
+  // Set to true if tokens should be expanded
+  bool ShouldExpandTokens;
+
+  UnknownPragmaHandler(const char *prefix, PrintPPOutputPPCallbacks *callbacks,
+                       bool RequireTokenExpansion)
+      : Prefix(prefix), Callbacks(callbacks),
+        ShouldExpandTokens(RequireTokenExpansion) {}
+  void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
+                    Token &PragmaTok) override {
+    // Figure out what line we went to and insert the appropriate number of
+    // newline characters.
+    Callbacks->MoveToLine(PragmaTok.getLocation(), /*RequireStartOfLine=*/true);
+    Callbacks->OS.write(Prefix, strlen(Prefix));
+    Callbacks->setEmittedTokensOnThisLine();
+
+    if (ShouldExpandTokens) {
+      // The first token does not have expanded macros. Expand them, if
+      // required.
+      auto Toks = std::make_unique<Token[]>(1);
+      Toks[0] = PragmaTok;
+      PP.EnterTokenStream(std::move(Toks), /*NumToks=*/1,
+                          /*DisableMacroExpansion=*/false,
+                          /*IsReinject=*/false);
+      PP.Lex(PragmaTok);
+    }
+
+    // Read and print all of the pragma tokens.
+    bool IsFirst = true;
+    while (PragmaTok.isNot(tok::eod)) {
+      Callbacks->HandleWhitespaceBeforeTok(PragmaTok, /*RequireSpace=*/IsFirst,
+                                           /*RequireSameLine=*/true);
+      IsFirst = false;
+      std::string TokSpell = PP.getSpelling(PragmaTok);
+      Callbacks->OS.write(&TokSpell[0], TokSpell.size());
+      Callbacks->setEmittedTokensOnThisLine();
+
+      if (ShouldExpandTokens)
+        PP.Lex(PragmaTok);
+      else
+        PP.LexUnexpandedToken(PragmaTok);
+    }
+    Callbacks->setEmittedDirectiveOnThisLine();
+  }
+};
+} // end anonymous namespace
+
+
+static void PrintPreprocessedTokens(Preprocessor &PP, Token &Tok,
+                                    PrintPPOutputPPCallbacks *Callbacks,
+                                    raw_ostream &OS) {
+  bool DropComments = PP.getLangOpts().TraditionalCPP &&
+                      !PP.getCommentRetentionState();
+
+  bool IsStartOfLine = false;
+  char Buffer[256];
+  while (true) {
+    // Two lines joined with line continuation ('\' as last character on the
+    // line) must be emitted as one line even though Tok.getLine() returns two
+    // different values. In this situation Tok.isAtStartOfLine() is false even
+    // though it may be the first token on the lexical line. When
+    // dropping/skipping a token that is at the start of a line, propagate the
+    // start-of-line-ness to the next token to not append it to the previous
+    // line.
+    IsStartOfLine = IsStartOfLine || Tok.isAtStartOfLine();
+
+    Callbacks->HandleWhitespaceBeforeTok(Tok, /*RequireSpace=*/false,
+                                         /*RequireSameLine=*/!IsStartOfLine);
+
+    if (DropComments && Tok.is(tok::comment)) {
+      // Skip comments. Normally the preprocessor does not generate
+      // tok::comment nodes at all when not keeping comments, but under
+      // -traditional-cpp the lexer keeps /all/ whitespace, including comments.
+      PP.Lex(Tok);
+      continue;
+    } else if (Tok.is(tok::eod)) {
+      // Don't print end of directive tokens, since they are typically newlines
+      // that mess up our line tracking. These come from unknown pre-processor
+      // directives or hash-prefixed comments in standalone assembly files.
+      PP.Lex(Tok);
+      // FIXME: The token on the next line after #include should have
+      // Tok.isAtStartOfLine() set.
+      IsStartOfLine = true;
+      continue;
+    } else if (Tok.is(tok::annot_module_include)) {
+      // PrintPPOutputPPCallbacks::InclusionDirective handles producing
+      // appropriate output here. Ignore this token entirely.
+      PP.Lex(Tok);
+      IsStartOfLine = true;
+      continue;
+    } else if (Tok.is(tok::annot_module_begin)) {
+      // FIXME: We retrieve this token after the FileChanged callback, and
+      // retrieve the module_end token before the FileChanged callback, so
+      // we render this within the file and render the module end outside the
+      // file, but this is backwards from the token locations: the module_begin
+      // token is at the include location (outside the file) and the module_end
+      // token is at the EOF location (within the file).
+      Callbacks->BeginModule(
+          reinterpret_cast<Module *>(Tok.getAnnotationValue()));
+      PP.Lex(Tok);
+      IsStartOfLine = true;
+      continue;
+    } else if (Tok.is(tok::annot_module_end)) {
+      Callbacks->EndModule(
+          reinterpret_cast<Module *>(Tok.getAnnotationValue()));
+      PP.Lex(Tok);
+      IsStartOfLine = true;
+      continue;
+    } else if (Tok.is(tok::annot_header_unit)) {
+      // This is a header-name that has been (effectively) converted into a
+      // module-name.
+      // FIXME: The module name could contain non-identifier module name
+      // components. We don't have a good way to round-trip those.
+      Module *M = reinterpret_cast<Module *>(Tok.getAnnotationValue());
+      std::string Name = M->getFullModuleName();
+      OS.write(Name.data(), Name.size());
+      Callbacks->HandleNewlinesInToken(Name.data(), Name.size());
+    } else if (Tok.isAnnotation()) {
+      // Ignore annotation tokens created by pragmas - the pragmas themselves
+      // will be reproduced in the preprocessed output.
+      PP.Lex(Tok);
+      continue;
+    } else if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
+      OS << II->getName();
+    } else if (Tok.isLiteral() && !Tok.needsCleaning() &&
+               Tok.getLiteralData()) {
+      OS.write(Tok.getLiteralData(), Tok.getLength());
+    } else if (Tok.getLength() < llvm::array_lengthof(Buffer)) {
+      const char *TokPtr = Buffer;
+      unsigned Len = PP.getSpelling(Tok, TokPtr);
+      OS.write(TokPtr, Len);
+
+      // Tokens that can contain embedded newlines need to adjust our current
+      // line number.
+      // FIXME: The token may end with a newline in which case
+      // setEmittedDirectiveOnThisLine/setEmittedTokensOnThisLine afterwards is
+      // wrong.
+      if (Tok.getKind() == tok::comment || Tok.getKind() == tok::unknown)
+        Callbacks->HandleNewlinesInToken(TokPtr, Len);
+      if (Tok.is(tok::comment) && Len >= 2 && TokPtr[0] == '/' &&
+          TokPtr[1] == '/') {
+        // It's a line comment;
+        // Ensure that we don't concatenate anything behind it.
+        Callbacks->setEmittedDirectiveOnThisLine();
+      }
+    } else {
+      std::string S = PP.getSpelling(Tok);
+      OS.write(S.data(), S.size());
+
+      // Tokens that can contain embedded newlines need to adjust our current
+      // line number.
+      if (Tok.getKind() == tok::comment || Tok.getKind() == tok::unknown)
+        Callbacks->HandleNewlinesInToken(S.data(), S.size());
+      if (Tok.is(tok::comment) && S.size() >= 2 && S[0] == '/' && S[1] == '/') {
+        // It's a line comment;
+        // Ensure that we don't concatenate anything behind it.
+        Callbacks->setEmittedDirectiveOnThisLine();
+      }
+    }
+    Callbacks->setEmittedTokensOnThisLine();
+    IsStartOfLine = false;
+
+    if (Tok.is(tok::eof)) break;
+
+    PP.Lex(Tok);
+  }
+}
+
+typedef std::pair<const IdentifierInfo *, MacroInfo *> id_macro_pair;
+static int MacroIDCompare(const id_macro_pair *LHS, const id_macro_pair *RHS) {
+  return LHS->first->getName().compare(RHS->first->getName());
+}
+
+static void DoPrintMacros(Preprocessor &PP, raw_ostream *OS) {
+  // Ignore unknown pragmas.
+  PP.IgnorePragmas();
+
+  // -dM mode just scans and ignores all tokens in the files, then dumps out
+  // the macro table at the end.
+  PP.EnterMainSourceFile();
+
+  Token Tok;
+  do PP.Lex(Tok);
+  while (Tok.isNot(tok::eof));
+
+  SmallVector<id_macro_pair, 128> MacrosByID;
+  for (Preprocessor::macro_iterator I = PP.macro_begin(), E = PP.macro_end();
+       I != E; ++I) {
+    auto *MD = I->second.getLatest();
+    if (MD && MD->isDefined())
+      MacrosByID.push_back(id_macro_pair(I->first, MD->getMacroInfo()));
+  }
+  llvm::array_pod_sort(MacrosByID.begin(), MacrosByID.end(), MacroIDCompare);
+
+  for (unsigned i = 0, e = MacrosByID.size(); i != e; ++i) {
+    MacroInfo &MI = *MacrosByID[i].second;
+    // Ignore computed macros like __LINE__ and friends.
+    if (MI.isBuiltinMacro()) continue;
+
+    PrintMacroDefinition(*MacrosByID[i].first, MI, PP, *OS);
+    *OS << '\n';
+  }
+}
+
+/// DoPrintPreprocessedInput - This implements -E mode.
+///
+void clang::DoPrintPreprocessedInput(Preprocessor &PP, raw_ostream *OS,
+                                     const PreprocessorOutputOptions &Opts) {
+  // Show macros with no output is handled specially.
+  if (!Opts.ShowCPP) {
+    assert(Opts.ShowMacros && "Not yet implemented!");
+    DoPrintMacros(PP, OS);
+    return;
+  }
+
+  // Inform the preprocessor whether we want it to retain comments or not, due
+  // to -C or -CC.
+  PP.SetCommentRetentionState(Opts.ShowComments, Opts.ShowMacroComments);
+
+  PrintPPOutputPPCallbacks *Callbacks = new PrintPPOutputPPCallbacks(
+      PP, *OS, !Opts.ShowLineMarkers, Opts.ShowMacros,
+      Opts.ShowIncludeDirectives, Opts.UseLineDirectives,
+      Opts.MinimizeWhitespace);
+
+  // Expand macros in pragmas with -fms-extensions.  The assumption is that
+  // the majority of pragmas in such a file will be Microsoft pragmas.
+  // Remember the handlers we will add so that we can remove them later.
+  std::unique_ptr<UnknownPragmaHandler> MicrosoftExtHandler(
+      new UnknownPragmaHandler(
+          "#pragma", Callbacks,
+          /*RequireTokenExpansion=*/PP.getLangOpts().MicrosoftExt));
+
+  std::unique_ptr<UnknownPragmaHandler> GCCHandler(new UnknownPragmaHandler(
+      "#pragma GCC", Callbacks,
+      /*RequireTokenExpansion=*/PP.getLangOpts().MicrosoftExt));
+
+  std::unique_ptr<UnknownPragmaHandler> ClangHandler(new UnknownPragmaHandler(
+      "#pragma clang", Callbacks,
+      /*RequireTokenExpansion=*/PP.getLangOpts().MicrosoftExt));
+
+  PP.AddPragmaHandler(MicrosoftExtHandler.get());
+  PP.AddPragmaHandler("GCC", GCCHandler.get());
+  PP.AddPragmaHandler("clang", ClangHandler.get());
+
+  // The tokens after pragma omp need to be expanded.
+  //
+  //  OpenMP [2.1, Directive format]
+  //  Preprocessing tokens following the #pragma omp are subject to macro
+  //  replacement.
+  std::unique_ptr<UnknownPragmaHandler> OpenMPHandler(
+      new UnknownPragmaHandler("#pragma omp", Callbacks,
+                               /*RequireTokenExpansion=*/true));
+  PP.AddPragmaHandler("omp", OpenMPHandler.get());
+
+  PP.addPPCallbacks(std::unique_ptr<PPCallbacks>(Callbacks));
+
+  // After we have configured the preprocessor, enter the main file.
+  PP.EnterMainSourceFile();
+
+  // Consume all of the tokens that come from the predefines buffer.  Those
+  // should not be emitted into the output and are guaranteed to be at the
+  // start.
+  const SourceManager &SourceMgr = PP.getSourceManager();
+  Token Tok;
+  do {
+    PP.Lex(Tok);
+    if (Tok.is(tok::eof) || !Tok.getLocation().isFileID())
+      break;
+
+    PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
+    if (PLoc.isInvalid())
+      break;
+
+    if (strcmp(PLoc.getFilename(), "<built-in>"))
+      break;
+  } while (true);
+
+  // Read all the preprocessed tokens, printing them out to the stream.
+  PrintPreprocessedTokens(PP, Tok, Callbacks, *OS);
+  *OS << '\n';
+
+  // Remove the handlers we just added to leave the preprocessor in a sane state
+  // so that it can be reused (for example by a clang::Parser instance).
+  PP.RemovePragmaHandler(MicrosoftExtHandler.get());
+  PP.RemovePragmaHandler("GCC", GCCHandler.get());
+  PP.RemovePragmaHandler("clang", ClangHandler.get());
+  PP.RemovePragmaHandler("omp", OpenMPHandler.get());
+}
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/FixItRewriter.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/FixItRewriter.cpp
new file mode 100644
index 0000000000..4fe64b96cb
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/FixItRewriter.cpp
@@ -0,0 +1,209 @@
+//===- FixItRewriter.cpp - Fix-It Rewriter Diagnostic Client --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a diagnostic client adaptor that performs rewrites as
+// suggested by code modification hints attached to diagnostics. It
+// then forwards any diagnostics to the adapted diagnostic client.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Frontend/FixItRewriter.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Edit/Commit.h"
+#include "clang/Edit/EditsReceiver.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Rewrite/Core/RewriteBuffer.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdio>
+#include <memory>
+#include <string>
+#include <system_error>
+#include <utility>
+
+using namespace clang;
+
+FixItRewriter::FixItRewriter(DiagnosticsEngine &Diags, SourceManager &SourceMgr,
+                             const LangOptions &LangOpts,
+                             FixItOptions *FixItOpts)
+    : Diags(Diags), Editor(SourceMgr, LangOpts), Rewrite(SourceMgr, LangOpts),
+      FixItOpts(FixItOpts) {
+  Owner = Diags.takeClient();
+  Client = Diags.getClient();
+  Diags.setClient(this, false);
+}
+
+FixItRewriter::~FixItRewriter() {
+  Diags.setClient(Client, Owner.release() != nullptr);
+}
+
+bool FixItRewriter::WriteFixedFile(FileID ID, raw_ostream &OS) {
+  const RewriteBuffer *RewriteBuf = Rewrite.getRewriteBufferFor(ID);
+  if (!RewriteBuf) return true;
+  RewriteBuf->write(OS);
+  OS.flush();
+  return false;
+}
+
+namespace {
+
+class RewritesReceiver : public edit::EditsReceiver {
+  Rewriter &Rewrite;
+
+public:
+  RewritesReceiver(Rewriter &Rewrite) : Rewrite(Rewrite) {}
+
+  void insert(SourceLocation loc, StringRef text) override {
+    Rewrite.InsertText(loc, text);
+  }
+
+  void replace(CharSourceRange range, StringRef text) override {
+    Rewrite.ReplaceText(range.getBegin(), Rewrite.getRangeSize(range), text);
+  }
+};
+
+} // namespace
+
+bool FixItRewriter::WriteFixedFiles(
+             std::vector<std::pair<std::string, std::string>> *RewrittenFiles) {
+  if (NumFailures > 0 && !FixItOpts->FixWhatYouCan) {
+    Diag(FullSourceLoc(), diag::warn_fixit_no_changes);
+    return true;
+  }
+
+  RewritesReceiver Rec(Rewrite);
+  Editor.applyRewrites(Rec);
+
+  if (FixItOpts->InPlace) {
+    // Overwriting open files on Windows is tricky, but the rewriter can do it
+    // for us.
+    Rewrite.overwriteChangedFiles();
+    return false;
+  }
+
+  for (iterator I = buffer_begin(), E = buffer_end(); I != E; ++I) {
+    const FileEntry *Entry = Rewrite.getSourceMgr().getFileEntryForID(I->first);
+    int fd;
+    std::string Filename =
+        FixItOpts->RewriteFilename(std::string(Entry->getName()), fd);
+    std::error_code EC;
+    std::unique_ptr<llvm::raw_fd_ostream> OS;
+    if (fd != -1) {
+      OS.reset(new llvm::raw_fd_ostream(fd, /*shouldClose=*/true));
+    } else {
+      OS.reset(new llvm::raw_fd_ostream(Filename, EC, llvm::sys::fs::OF_None));
+    }
+    if (EC) {
+      Diags.Report(clang::diag::err_fe_unable_to_open_output) << Filename
+                                                              << EC.message();
+      continue;
+    }
+    RewriteBuffer &RewriteBuf = I->second;
+    RewriteBuf.write(*OS);
+    OS->flush();
+
+    if (RewrittenFiles)
+      RewrittenFiles->push_back(
+          std::make_pair(std::string(Entry->getName()), Filename));
+  }
+
+  return false;
+}
+
+bool FixItRewriter::IncludeInDiagnosticCounts() const {
+  return Client ? Client->IncludeInDiagnosticCounts() : true;
+}
+
+void FixItRewriter::HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
+                                     const Diagnostic &Info) {
+  // Default implementation (Warnings/errors count).
+  DiagnosticConsumer::HandleDiagnostic(DiagLevel, Info);
+
+  if (!FixItOpts->Silent ||
+      DiagLevel >= DiagnosticsEngine::Error ||
+      (DiagLevel == DiagnosticsEngine::Note && !PrevDiagSilenced) ||
+      (DiagLevel > DiagnosticsEngine::Note && Info.getNumFixItHints())) {
+    Client->HandleDiagnostic(DiagLevel, Info);
+    PrevDiagSilenced = false;
+  } else {
+    PrevDiagSilenced = true;
+  }
+
+  // Skip over any diagnostics that are ignored or notes.
+  if (DiagLevel <= DiagnosticsEngine::Note)
+    return;
+  // Skip over errors if we are only fixing warnings.
+  if (DiagLevel >= DiagnosticsEngine::Error && FixItOpts->FixOnlyWarnings) {
+    ++NumFailures;
+    return;
+  }
+
+  // Make sure that we can perform all of the modifications we
+  // in this diagnostic.
+  edit::Commit commit(Editor);
+  for (unsigned Idx = 0, Last = Info.getNumFixItHints();
+       Idx < Last; ++Idx) {
+    const FixItHint &Hint = Info.getFixItHint(Idx);
+
+    if (Hint.CodeToInsert.empty()) {
+      if (Hint.InsertFromRange.isValid())
+        commit.insertFromRange(Hint.RemoveRange.getBegin(),
+                           Hint.InsertFromRange, /*afterToken=*/false,
+                           Hint.BeforePreviousInsertions);
+      else
+        commit.remove(Hint.RemoveRange);
+    } else {
+      if (Hint.RemoveRange.isTokenRange() ||
+          Hint.RemoveRange.getBegin() != Hint.RemoveRange.getEnd())
+        commit.replace(Hint.RemoveRange, Hint.CodeToInsert);
+      else
+        commit.insert(Hint.RemoveRange.getBegin(), Hint.CodeToInsert,
+                    /*afterToken=*/false, Hint.BeforePreviousInsertions);
+    }
+  }
+  bool CanRewrite = Info.getNumFixItHints() > 0 && commit.isCommitable();
+
+  if (!CanRewrite) {
+    if (Info.getNumFixItHints() > 0)
+      Diag(Info.getLocation(), diag::note_fixit_in_macro);
+
+    // If this was an error, refuse to perform any rewriting.
+    if (DiagLevel >= DiagnosticsEngine::Error) {
+      if (++NumFailures == 1)
+        Diag(Info.getLocation(), diag::note_fixit_unfixed_error);
+    }
+    return;
+  }
+
+  if (!Editor.commit(commit)) {
+    ++NumFailures;
+    Diag(Info.getLocation(), diag::note_fixit_failed);
+    return;
+  }
+
+  Diag(Info.getLocation(), diag::note_fixit_applied);
+}
+
+/// Emit a diagnostic via the adapted diagnostic client.
+void FixItRewriter::Diag(SourceLocation Loc, unsigned DiagID) {
+  // When producing this diagnostic, we temporarily bypass ourselves,
+  // clear out any current diagnostic, and let the downstream client
+  // format the diagnostic.
+  Diags.setClient(Client, false);
+  Diags.Clear();
+  Diags.Report(Loc, DiagID);
+  Diags.setClient(this, false);
+}
+
+FixItOptions::~FixItOptions() = default;
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/FrontendActions.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/FrontendActions.cpp
new file mode 100644
index 0000000000..6685109f8d
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/FrontendActions.cpp
@@ -0,0 +1,323 @@
+//===--- FrontendActions.cpp ----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Frontend/FrontendActions.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/LangStandard.h"
+#include "clang/Config/config.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PreprocessorOptions.h"
+#include "clang/Rewrite/Frontend/ASTConsumers.h"
+#include "clang/Rewrite/Frontend/FixItRewriter.h"
+#include "clang/Rewrite/Frontend/Rewriters.h"
+#include "clang/Serialization/ASTReader.h"
+#include "clang/Serialization/ModuleFile.h"
+#include "clang/Serialization/ModuleManager.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/Support/CrashRecoveryContext.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+#include <memory>
+#include <utility>
+
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// AST Consumer Actions
+//===----------------------------------------------------------------------===//
+
+std::unique_ptr<ASTConsumer>
+HTMLPrintAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  if (std::unique_ptr<raw_ostream> OS =
+          CI.createDefaultOutputFile(false, InFile))
+    return CreateHTMLPrinter(std::move(OS), CI.getPreprocessor());
+  return nullptr;
+}
+
+FixItAction::FixItAction() {}
+FixItAction::~FixItAction() {}
+
+std::unique_ptr<ASTConsumer>
+FixItAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  return std::make_unique<ASTConsumer>();
+}
+
+namespace {
+class FixItRewriteInPlace : public FixItOptions {
+public:
+  FixItRewriteInPlace() { InPlace = true; }
+
+  std::string RewriteFilename(const std::string &Filename, int &fd) override {
+    llvm_unreachable("don't call RewriteFilename for inplace rewrites");
+  }
+};
+
+class FixItActionSuffixInserter : public FixItOptions {
+  std::string NewSuffix;
+
+public:
+  FixItActionSuffixInserter(std::string NewSuffix, bool FixWhatYouCan)
+      : NewSuffix(std::move(NewSuffix)) {
+    this->FixWhatYouCan = FixWhatYouCan;
+  }
+
+  std::string RewriteFilename(const std::string &Filename, int &fd) override {
+    fd = -1;
+    SmallString<128> Path(Filename);
+    llvm::sys::path::replace_extension(Path,
+      NewSuffix + llvm::sys::path::extension(Path));
+    return std::string(Path.str());
+  }
+};
+
+class FixItRewriteToTemp : public FixItOptions {
+public:
+  std::string RewriteFilename(const std::string &Filename, int &fd) override {
+    SmallString<128> Path;
+    llvm::sys::fs::createTemporaryFile(llvm::sys::path::filename(Filename),
+                                       llvm::sys::path::extension(Filename).drop_front(), fd,
+                                       Path);
+    return std::string(Path.str());
+  }
+};
+} // end anonymous namespace
+
+bool FixItAction::BeginSourceFileAction(CompilerInstance &CI) {
+  const FrontendOptions &FEOpts = getCompilerInstance().getFrontendOpts();
+  if (!FEOpts.FixItSuffix.empty()) {
+    FixItOpts.reset(new FixItActionSuffixInserter(FEOpts.FixItSuffix,
+                                                  FEOpts.FixWhatYouCan));
+  } else {
+    FixItOpts.reset(new FixItRewriteInPlace);
+    FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
+  }
+  Rewriter.reset(new FixItRewriter(CI.getDiagnostics(), CI.getSourceManager(),
+                                   CI.getLangOpts(), FixItOpts.get()));
+  return true;
+}
+
+void FixItAction::EndSourceFileAction() {
+  // Otherwise rewrite all files.
+  Rewriter->WriteFixedFiles();
+}
+
+bool FixItRecompile::BeginInvocation(CompilerInstance &CI) {
+
+  std::vector<std::pair<std::string, std::string> > RewrittenFiles;
+  bool err = false;
+  {
+    const FrontendOptions &FEOpts = CI.getFrontendOpts();
+    std::unique_ptr<FrontendAction> FixAction(new SyntaxOnlyAction());
+    if (FixAction->BeginSourceFile(CI, FEOpts.Inputs[0])) {
+      std::unique_ptr<FixItOptions> FixItOpts;
+      if (FEOpts.FixToTemporaries)
+        FixItOpts.reset(new FixItRewriteToTemp());
+      else
+        FixItOpts.reset(new FixItRewriteInPlace());
+      FixItOpts->Silent = true;
+      FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
+      FixItOpts->FixOnlyWarnings = FEOpts.FixOnlyWarnings;
+      FixItRewriter Rewriter(CI.getDiagnostics(), CI.getSourceManager(),
+                             CI.getLangOpts(), FixItOpts.get());
+      if (llvm::Error Err = FixAction->Execute()) {
+        // FIXME this drops the error on the floor.
+        consumeError(std::move(Err));
+        return false;
+      }
+
+      err = Rewriter.WriteFixedFiles(&RewrittenFiles);
+
+      FixAction->EndSourceFile();
+      CI.setSourceManager(nullptr);
+      CI.setFileManager(nullptr);
+    } else {
+      err = true;
+    }
+  }
+  if (err)
+    return false;
+  CI.getDiagnosticClient().clear();
+  CI.getDiagnostics().Reset();
+
+  PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
+  PPOpts.RemappedFiles.insert(PPOpts.RemappedFiles.end(),
+                              RewrittenFiles.begin(), RewrittenFiles.end());
+  PPOpts.RemappedFilesKeepOriginalName = false;
+
+  return true;
+}
+
+#if CLANG_ENABLE_OBJC_REWRITER
+
+std::unique_ptr<ASTConsumer>
+RewriteObjCAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
+  if (std::unique_ptr<raw_ostream> OS =
+          CI.createDefaultOutputFile(false, InFile, "cpp")) {
+    if (CI.getLangOpts().ObjCRuntime.isNonFragile())
+      return CreateModernObjCRewriter(
+          std::string(InFile), std::move(OS), CI.getDiagnostics(),
+          CI.getLangOpts(), CI.getDiagnosticOpts().NoRewriteMacros,
+          (CI.getCodeGenOpts().getDebugInfo() != codegenoptions::NoDebugInfo));
+    return CreateObjCRewriter(std::string(InFile), std::move(OS),
+                              CI.getDiagnostics(), CI.getLangOpts(),
+                              CI.getDiagnosticOpts().NoRewriteMacros);
+  }
+  return nullptr;
+}
+
+#endif
+
+//===----------------------------------------------------------------------===//
+// Preprocessor Actions
+//===----------------------------------------------------------------------===//
+
+void RewriteMacrosAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  std::unique_ptr<raw_ostream> OS =
+      CI.createDefaultOutputFile(/*Binary=*/true, getCurrentFileOrBufferName());
+  if (!OS) return;
+
+  RewriteMacrosInInput(CI.getPreprocessor(), OS.get());
+}
+
+void RewriteTestAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+  std::unique_ptr<raw_ostream> OS =
+      CI.createDefaultOutputFile(/*Binary=*/false, getCurrentFileOrBufferName());
+  if (!OS) return;
+
+  DoRewriteTest(CI.getPreprocessor(), OS.get());
+}
+
+class RewriteIncludesAction::RewriteImportsListener : public ASTReaderListener {
+  CompilerInstance &CI;
+  std::weak_ptr<raw_ostream> Out;
+
+  llvm::DenseSet<const FileEntry*> Rewritten;
+
+public:
+  RewriteImportsListener(CompilerInstance &CI, std::shared_ptr<raw_ostream> Out)
+      : CI(CI), Out(Out) {}
+
+  void visitModuleFile(StringRef Filename,
+                       serialization::ModuleKind Kind) override {
+    auto File = CI.getFileManager().getFile(Filename);
+    assert(File && "missing file for loaded module?");
+
+    // Only rewrite each module file once.
+    if (!Rewritten.insert(*File).second)
+      return;
+
+    serialization::ModuleFile *MF =
+        CI.getASTReader()->getModuleManager().lookup(*File);
+    assert(MF && "missing module file for loaded module?");
+
+    // Not interested in PCH / preambles.
+    if (!MF->isModule())
+      return;
+
+    auto OS = Out.lock();
+    assert(OS && "loaded module file after finishing rewrite action?");
+
+    (*OS) << "#pragma clang module build ";
+    if (isValidAsciiIdentifier(MF->ModuleName))
+      (*OS) << MF->ModuleName;
+    else {
+      (*OS) << '"';
+      OS->write_escaped(MF->ModuleName);
+      (*OS) << '"';
+    }
+    (*OS) << '\n';
+
+    // Rewrite the contents of the module in a separate compiler instance.
+    CompilerInstance Instance(CI.getPCHContainerOperations(),
+                              &CI.getModuleCache());
+    Instance.setInvocation(
+        std::make_shared<CompilerInvocation>(CI.getInvocation()));
+    Instance.createDiagnostics(
+        new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
+        /*ShouldOwnClient=*/true);
+    Instance.getFrontendOpts().DisableFree = false;
+    Instance.getFrontendOpts().Inputs.clear();
+    Instance.getFrontendOpts().Inputs.emplace_back(
+        Filename, InputKind(Language::Unknown, InputKind::Precompiled));
+    Instance.getFrontendOpts().ModuleFiles.clear();
+    Instance.getFrontendOpts().ModuleMapFiles.clear();
+    // Don't recursively rewrite imports. We handle them all at the top level.
+    Instance.getPreprocessorOutputOpts().RewriteImports = false;
+
+    llvm::CrashRecoveryContext().RunSafelyOnThread([&]() {
+      RewriteIncludesAction Action;
+      Action.OutputStream = OS;
+      Instance.ExecuteAction(Action);
+    });
+
+    (*OS) << "#pragma clang module endbuild /*" << MF->ModuleName << "*/\n";
+  }
+};
+
+bool RewriteIncludesAction::BeginSourceFileAction(CompilerInstance &CI) {
+  if (!OutputStream) {
+    OutputStream =
+        CI.createDefaultOutputFile(/*Binary=*/true, getCurrentFileOrBufferName());
+    if (!OutputStream)
+      return false;
+  }
+
+  auto &OS = *OutputStream;
+
+  // If we're preprocessing a module map, start by dumping the contents of the
+  // module itself before switching to the input buffer.
+  auto &Input = getCurrentInput();
+  if (Input.getKind().getFormat() == InputKind::ModuleMap) {
+    if (Input.isFile()) {
+      OS << "# 1 \"";
+      OS.write_escaped(Input.getFile());
+      OS << "\"\n";
+    }
+    getCurrentModule()->print(OS);
+    OS << "#pragma clang module contents\n";
+  }
+
+  // If we're rewriting imports, set up a listener to track when we import
+  // module files.
+  if (CI.getPreprocessorOutputOpts().RewriteImports) {
+    CI.createASTReader();
+    CI.getASTReader()->addListener(
+        std::make_unique<RewriteImportsListener>(CI, OutputStream));
+  }
+
+  return true;
+}
+
+void RewriteIncludesAction::ExecuteAction() {
+  CompilerInstance &CI = getCompilerInstance();
+
+  // If we're rewriting imports, emit the module build output first rather
+  // than switching back and forth (potentially in the middle of a line).
+  if (CI.getPreprocessorOutputOpts().RewriteImports) {
+    std::string Buffer;
+    llvm::raw_string_ostream OS(Buffer);
+
+    RewriteIncludesInInput(CI.getPreprocessor(), &OS,
+                           CI.getPreprocessorOutputOpts());
+
+    (*OutputStream) << OS.str();
+  } else {
+    RewriteIncludesInInput(CI.getPreprocessor(), OutputStream.get(),
+                           CI.getPreprocessorOutputOpts());
+  }
+
+  OutputStream.reset();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/HTMLPrint.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/HTMLPrint.cpp
new file mode 100644
index 0000000000..1388c2e1fa
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/HTMLPrint.cpp
@@ -0,0 +1,91 @@
+//===--- HTMLPrint.cpp - Source code -> HTML pretty-printing --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Pretty-printing of source code to HTML.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Rewrite/Core/HTMLRewrite.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "clang/Rewrite/Frontend/ASTConsumers.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace clang;
+
+//===----------------------------------------------------------------------===//
+// Functional HTML pretty-printing.
+//===----------------------------------------------------------------------===//
+
+namespace {
+  class HTMLPrinter : public ASTConsumer {
+    Rewriter R;
+    std::unique_ptr<raw_ostream> Out;
+    Preprocessor &PP;
+    bool SyntaxHighlight, HighlightMacros;
+
+  public:
+    HTMLPrinter(std::unique_ptr<raw_ostream> OS, Preprocessor &pp,
+                bool _SyntaxHighlight, bool _HighlightMacros)
+      : Out(std::move(OS)), PP(pp), SyntaxHighlight(_SyntaxHighlight),
+        HighlightMacros(_HighlightMacros) {}
+
+    void Initialize(ASTContext &context) override;
+    void HandleTranslationUnit(ASTContext &Ctx) override;
+  };
+}
+
+std::unique_ptr<ASTConsumer>
+clang::CreateHTMLPrinter(std::unique_ptr<raw_ostream> OS, Preprocessor &PP,
+                         bool SyntaxHighlight, bool HighlightMacros) {
+  return std::make_unique<HTMLPrinter>(std::move(OS), PP, SyntaxHighlight,
+                                        HighlightMacros);
+}
+
+void HTMLPrinter::Initialize(ASTContext &context) {
+  R.setSourceMgr(context.getSourceManager(), context.getLangOpts());
+}
+
+void HTMLPrinter::HandleTranslationUnit(ASTContext &Ctx) {
+  if (PP.getDiagnostics().hasErrorOccurred())
+    return;
+
+  // Format the file.
+  FileID FID = R.getSourceMgr().getMainFileID();
+  const FileEntry* Entry = R.getSourceMgr().getFileEntryForID(FID);
+  StringRef Name;
+  // In some cases, in particular the case where the input is from stdin,
+  // there is no entry.  Fall back to the memory buffer for a name in those
+  // cases.
+  if (Entry)
+    Name = Entry->getName();
+  else
+    Name = R.getSourceMgr().getBufferOrFake(FID).getBufferIdentifier();
+
+  html::AddLineNumbers(R, FID);
+  html::AddHeaderFooterInternalBuiltinCSS(R, FID, Name);
+
+  // If we have a preprocessor, relex the file and syntax highlight.
+  // We might not have a preprocessor if we come from a deserialized AST file,
+  // for example.
+
+  if (SyntaxHighlight) html::SyntaxHighlight(R, FID, PP);
+  if (HighlightMacros) html::HighlightMacros(R, FID, PP);
+  html::EscapeText(R, FID, false, true);
+
+  // Emit the HTML.
+  const RewriteBuffer &RewriteBuf = R.getEditBuffer(FID);
+  std::unique_ptr<char[]> Buffer(new char[RewriteBuf.size()]);
+  std::copy(RewriteBuf.begin(), RewriteBuf.end(), Buffer.get());
+  Out->write(Buffer.get(), RewriteBuf.size());
+}
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/InclusionRewriter.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/InclusionRewriter.cpp
new file mode 100644
index 0000000000..3e8d582f90
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/InclusionRewriter.cpp
@@ -0,0 +1,543 @@
+//===--- InclusionRewriter.cpp - Rewrite includes into their expansions ---===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This code rewrites include invocations into their expansions.  This gives you
+// a file with all included files merged into it.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Frontend/Rewriters.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/PreprocessorOutputOptions.h"
+#include "clang/Lex/Pragma.h"
+#include "clang/Lex/Preprocessor.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace clang;
+using namespace llvm;
+
+namespace {
+
+class InclusionRewriter : public PPCallbacks {
+  /// Information about which #includes were actually performed,
+  /// created by preprocessor callbacks.
+  struct IncludedFile {
+    FileID Id;
+    SrcMgr::CharacteristicKind FileType;
+    IncludedFile(FileID Id, SrcMgr::CharacteristicKind FileType)
+        : Id(Id), FileType(FileType) {}
+  };
+  Preprocessor &PP; ///< Used to find inclusion directives.
+  SourceManager &SM; ///< Used to read and manage source files.
+  raw_ostream &OS; ///< The destination stream for rewritten contents.
+  StringRef MainEOL; ///< The line ending marker to use.
+  llvm::MemoryBufferRef PredefinesBuffer; ///< The preprocessor predefines.
+  bool ShowLineMarkers; ///< Show #line markers.
+  bool UseLineDirectives; ///< Use of line directives or line markers.
+  /// Tracks where inclusions that change the file are found.
+  std::map<SourceLocation, IncludedFile> FileIncludes;
+  /// Tracks where inclusions that import modules are found.
+  std::map<SourceLocation, const Module *> ModuleIncludes;
+  /// Tracks where inclusions that enter modules (in a module build) are found.
+  std::map<SourceLocation, const Module *> ModuleEntryIncludes;
+  /// Tracks where #if and #elif directives get evaluated and whether to true.
+  std::map<SourceLocation, bool> IfConditions;
+  /// Used transitively for building up the FileIncludes mapping over the
+  /// various \c PPCallbacks callbacks.
+  SourceLocation LastInclusionLocation;
+public:
+  InclusionRewriter(Preprocessor &PP, raw_ostream &OS, bool ShowLineMarkers,
+                    bool UseLineDirectives);
+  void Process(FileID FileId, SrcMgr::CharacteristicKind FileType);
+  void setPredefinesBuffer(const llvm::MemoryBufferRef &Buf) {
+    PredefinesBuffer = Buf;
+  }
+  void detectMainFileEOL();
+  void handleModuleBegin(Token &Tok) {
+    assert(Tok.getKind() == tok::annot_module_begin);
+    ModuleEntryIncludes.insert(
+        {Tok.getLocation(), (Module *)Tok.getAnnotationValue()});
+  }
+private:
+  void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                   SrcMgr::CharacteristicKind FileType,
+                   FileID PrevFID) override;
+  void FileSkipped(const FileEntryRef &SkippedFile, const Token &FilenameTok,
+                   SrcMgr::CharacteristicKind FileType) override;
+  void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
+                          StringRef FileName, bool IsAngled,
+                          CharSourceRange FilenameRange, const FileEntry *File,
+                          StringRef SearchPath, StringRef RelativePath,
+                          const Module *Imported,
+                          SrcMgr::CharacteristicKind FileType) override;
+  void If(SourceLocation Loc, SourceRange ConditionRange,
+          ConditionValueKind ConditionValue) override;
+  void Elif(SourceLocation Loc, SourceRange ConditionRange,
+            ConditionValueKind ConditionValue, SourceLocation IfLoc) override;
+  void WriteLineInfo(StringRef Filename, int Line,
+                     SrcMgr::CharacteristicKind FileType,
+                     StringRef Extra = StringRef());
+  void WriteImplicitModuleImport(const Module *Mod);
+  void OutputContentUpTo(const MemoryBufferRef &FromFile, unsigned &WriteFrom,
+                         unsigned WriteTo, StringRef EOL, int &lines,
+                         bool EnsureNewline);
+  void CommentOutDirective(Lexer &DirectivesLex, const Token &StartToken,
+                           const MemoryBufferRef &FromFile, StringRef EOL,
+                           unsigned &NextToWrite, int &Lines);
+  const IncludedFile *FindIncludeAtLocation(SourceLocation Loc) const;
+  const Module *FindModuleAtLocation(SourceLocation Loc) const;
+  const Module *FindEnteredModule(SourceLocation Loc) const;
+  bool IsIfAtLocationTrue(SourceLocation Loc) const;
+  StringRef NextIdentifierName(Lexer &RawLex, Token &RawToken);
+};
+
+}  // end anonymous namespace
+
+/// Initializes an InclusionRewriter with a \p PP source and \p OS destination.
+InclusionRewriter::InclusionRewriter(Preprocessor &PP, raw_ostream &OS,
+                                     bool ShowLineMarkers,
+                                     bool UseLineDirectives)
+    : PP(PP), SM(PP.getSourceManager()), OS(OS), MainEOL("\n"),
+      ShowLineMarkers(ShowLineMarkers), UseLineDirectives(UseLineDirectives),
+      LastInclusionLocation(SourceLocation()) {}
+
+/// Write appropriate line information as either #line directives or GNU line
+/// markers depending on what mode we're in, including the \p Filename and
+/// \p Line we are located at, using the specified \p EOL line separator, and
+/// any \p Extra context specifiers in GNU line directives.
+void InclusionRewriter::WriteLineInfo(StringRef Filename, int Line,
+                                      SrcMgr::CharacteristicKind FileType,
+                                      StringRef Extra) {
+  if (!ShowLineMarkers)
+    return;
+  if (UseLineDirectives) {
+    OS << "#line" << ' ' << Line << ' ' << '"';
+    OS.write_escaped(Filename);
+    OS << '"';
+  } else {
+    // Use GNU linemarkers as described here:
+    // http://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html
+    OS << '#' << ' ' << Line << ' ' << '"';
+    OS.write_escaped(Filename);
+    OS << '"';
+    if (!Extra.empty())
+      OS << Extra;
+    if (FileType == SrcMgr::C_System)
+      // "`3' This indicates that the following text comes from a system header
+      // file, so certain warnings should be suppressed."
+      OS << " 3";
+    else if (FileType == SrcMgr::C_ExternCSystem)
+      // as above for `3', plus "`4' This indicates that the following text
+      // should be treated as being wrapped in an implicit extern "C" block."
+      OS << " 3 4";
+  }
+  OS << MainEOL;
+}
+
+void InclusionRewriter::WriteImplicitModuleImport(const Module *Mod) {
+  OS << "#pragma clang module import " << Mod->getFullModuleName(true)
+     << " /* clang -frewrite-includes: implicit import */" << MainEOL;
+}
+
+/// FileChanged - Whenever the preprocessor enters or exits a #include file
+/// it invokes this handler.
+void InclusionRewriter::FileChanged(SourceLocation Loc,
+                                    FileChangeReason Reason,
+                                    SrcMgr::CharacteristicKind NewFileType,
+                                    FileID) {
+  if (Reason != EnterFile)
+    return;
+  if (LastInclusionLocation.isInvalid())
+    // we didn't reach this file (eg: the main file) via an inclusion directive
+    return;
+  FileID Id = FullSourceLoc(Loc, SM).getFileID();
+  auto P = FileIncludes.insert(
+      std::make_pair(LastInclusionLocation, IncludedFile(Id, NewFileType)));
+  (void)P;
+  assert(P.second && "Unexpected revisitation of the same include directive");
+  LastInclusionLocation = SourceLocation();
+}
+
+/// Called whenever an inclusion is skipped due to canonical header protection
+/// macros.
+void InclusionRewriter::FileSkipped(const FileEntryRef & /*SkippedFile*/,
+                                    const Token & /*FilenameTok*/,
+                                    SrcMgr::CharacteristicKind /*FileType*/) {
+  assert(LastInclusionLocation.isValid() &&
+         "A file, that wasn't found via an inclusion directive, was skipped");
+  LastInclusionLocation = SourceLocation();
+}
+
+/// This should be called whenever the preprocessor encounters include
+/// directives. It does not say whether the file has been included, but it
+/// provides more information about the directive (hash location instead
+/// of location inside the included file). It is assumed that the matching
+/// FileChanged() or FileSkipped() is called after this (or neither is
+/// called if this #include results in an error or does not textually include
+/// anything).
+void InclusionRewriter::InclusionDirective(SourceLocation HashLoc,
+                                           const Token &/*IncludeTok*/,
+                                           StringRef /*FileName*/,
+                                           bool /*IsAngled*/,
+                                           CharSourceRange /*FilenameRange*/,
+                                           const FileEntry * /*File*/,
+                                           StringRef /*SearchPath*/,
+                                           StringRef /*RelativePath*/,
+                                           const Module *Imported,
+                                           SrcMgr::CharacteristicKind FileType){
+  if (Imported) {
+    auto P = ModuleIncludes.insert(std::make_pair(HashLoc, Imported));
+    (void)P;
+    assert(P.second && "Unexpected revisitation of the same include directive");
+  } else
+    LastInclusionLocation = HashLoc;
+}
+
+void InclusionRewriter::If(SourceLocation Loc, SourceRange ConditionRange,
+                           ConditionValueKind ConditionValue) {
+  auto P = IfConditions.insert(std::make_pair(Loc, ConditionValue == CVK_True));
+  (void)P;
+  assert(P.second && "Unexpected revisitation of the same if directive");
+}
+
+void InclusionRewriter::Elif(SourceLocation Loc, SourceRange ConditionRange,
+                             ConditionValueKind ConditionValue,
+                             SourceLocation IfLoc) {
+  auto P = IfConditions.insert(std::make_pair(Loc, ConditionValue == CVK_True));
+  (void)P;
+  assert(P.second && "Unexpected revisitation of the same elif directive");
+}
+
+/// Simple lookup for a SourceLocation (specifically one denoting the hash in
+/// an inclusion directive) in the map of inclusion information, FileChanges.
+const InclusionRewriter::IncludedFile *
+InclusionRewriter::FindIncludeAtLocation(SourceLocation Loc) const {
+  const auto I = FileIncludes.find(Loc);
+  if (I != FileIncludes.end())
+    return &I->second;
+  return nullptr;
+}
+
+/// Simple lookup for a SourceLocation (specifically one denoting the hash in
+/// an inclusion directive) in the map of module inclusion information.
+const Module *
+InclusionRewriter::FindModuleAtLocation(SourceLocation Loc) const {
+  const auto I = ModuleIncludes.find(Loc);
+  if (I != ModuleIncludes.end())
+    return I->second;
+  return nullptr;
+}
+
+/// Simple lookup for a SourceLocation (specifically one denoting the hash in
+/// an inclusion directive) in the map of module entry information.
+const Module *
+InclusionRewriter::FindEnteredModule(SourceLocation Loc) const {
+  const auto I = ModuleEntryIncludes.find(Loc);
+  if (I != ModuleEntryIncludes.end())
+    return I->second;
+  return nullptr;
+}
+
+bool InclusionRewriter::IsIfAtLocationTrue(SourceLocation Loc) const {
+  const auto I = IfConditions.find(Loc);
+  if (I != IfConditions.end())
+    return I->second;
+  return false;
+}
+
+void InclusionRewriter::detectMainFileEOL() {
+  Optional<MemoryBufferRef> FromFile = *SM.getBufferOrNone(SM.getMainFileID());
+  assert(FromFile);
+  if (!FromFile)
+    return; // Should never happen, but whatever.
+  MainEOL = FromFile->getBuffer().detectEOL();
+}
+
+/// Writes out bytes from \p FromFile, starting at \p NextToWrite and ending at
+/// \p WriteTo - 1.
+void InclusionRewriter::OutputContentUpTo(const MemoryBufferRef &FromFile,
+                                          unsigned &WriteFrom, unsigned WriteTo,
+                                          StringRef LocalEOL, int &Line,
+                                          bool EnsureNewline) {
+  if (WriteTo <= WriteFrom)
+    return;
+  if (FromFile == PredefinesBuffer) {
+    // Ignore the #defines of the predefines buffer.
+    WriteFrom = WriteTo;
+    return;
+  }
+
+  // If we would output half of a line ending, advance one character to output
+  // the whole line ending.  All buffers are null terminated, so looking ahead
+  // one byte is safe.
+  if (LocalEOL.size() == 2 &&
+      LocalEOL[0] == (FromFile.getBufferStart() + WriteTo)[-1] &&
+      LocalEOL[1] == (FromFile.getBufferStart() + WriteTo)[0])
+    WriteTo++;
+
+  StringRef TextToWrite(FromFile.getBufferStart() + WriteFrom,
+                        WriteTo - WriteFrom);
+
+  if (MainEOL == LocalEOL) {
+    OS << TextToWrite;
+    // count lines manually, it's faster than getPresumedLoc()
+    Line += TextToWrite.count(LocalEOL);
+    if (EnsureNewline && !TextToWrite.endswith(LocalEOL))
+      OS << MainEOL;
+  } else {
+    // Output the file one line at a time, rewriting the line endings as we go.
+    StringRef Rest = TextToWrite;
+    while (!Rest.empty()) {
+      StringRef LineText;
+      std::tie(LineText, Rest) = Rest.split(LocalEOL);
+      OS << LineText;
+      Line++;
+      if (!Rest.empty())
+        OS << MainEOL;
+    }
+    if (TextToWrite.endswith(LocalEOL) || EnsureNewline)
+      OS << MainEOL;
+  }
+  WriteFrom = WriteTo;
+}
+
+/// Print characters from \p FromFile starting at \p NextToWrite up until the
+/// inclusion directive at \p StartToken, then print out the inclusion
+/// inclusion directive disabled by a #if directive, updating \p NextToWrite
+/// and \p Line to track the number of source lines visited and the progress
+/// through the \p FromFile buffer.
+void InclusionRewriter::CommentOutDirective(Lexer &DirectiveLex,
+                                            const Token &StartToken,
+                                            const MemoryBufferRef &FromFile,
+                                            StringRef LocalEOL,
+                                            unsigned &NextToWrite, int &Line) {
+  OutputContentUpTo(FromFile, NextToWrite,
+                    SM.getFileOffset(StartToken.getLocation()), LocalEOL, Line,
+                    false);
+  Token DirectiveToken;
+  do {
+    DirectiveLex.LexFromRawLexer(DirectiveToken);
+  } while (!DirectiveToken.is(tok::eod) && DirectiveToken.isNot(tok::eof));
+  if (FromFile == PredefinesBuffer) {
+    // OutputContentUpTo() would not output anything anyway.
+    return;
+  }
+  OS << "#if 0 /* expanded by -frewrite-includes */" << MainEOL;
+  OutputContentUpTo(FromFile, NextToWrite,
+                    SM.getFileOffset(DirectiveToken.getLocation()) +
+                        DirectiveToken.getLength(),
+                    LocalEOL, Line, true);
+  OS << "#endif /* expanded by -frewrite-includes */" << MainEOL;
+}
+
+/// Find the next identifier in the pragma directive specified by \p RawToken.
+StringRef InclusionRewriter::NextIdentifierName(Lexer &RawLex,
+                                                Token &RawToken) {
+  RawLex.LexFromRawLexer(RawToken);
+  if (RawToken.is(tok::raw_identifier))
+    PP.LookUpIdentifierInfo(RawToken);
+  if (RawToken.is(tok::identifier))
+    return RawToken.getIdentifierInfo()->getName();
+  return StringRef();
+}
+
+/// Use a raw lexer to analyze \p FileId, incrementally copying parts of it
+/// and including content of included files recursively.
+void InclusionRewriter::Process(FileID FileId,
+                                SrcMgr::CharacteristicKind FileType) {
+  MemoryBufferRef FromFile;
+  {
+    auto B = SM.getBufferOrNone(FileId);
+    assert(B && "Attempting to process invalid inclusion");
+    if (B)
+      FromFile = *B;
+  }
+  StringRef FileName = FromFile.getBufferIdentifier();
+  Lexer RawLex(FileId, FromFile, PP.getSourceManager(), PP.getLangOpts());
+  RawLex.SetCommentRetentionState(false);
+
+  StringRef LocalEOL = FromFile.getBuffer().detectEOL();
+
+  // Per the GNU docs: "1" indicates entering a new file.
+  if (FileId == SM.getMainFileID() || FileId == PP.getPredefinesFileID())
+    WriteLineInfo(FileName, 1, FileType, "");
+  else
+    WriteLineInfo(FileName, 1, FileType, " 1");
+
+  if (SM.getFileIDSize(FileId) == 0)
+    return;
+
+  // The next byte to be copied from the source file, which may be non-zero if
+  // the lexer handled a BOM.
+  unsigned NextToWrite = SM.getFileOffset(RawLex.getSourceLocation());
+  assert(SM.getLineNumber(FileId, NextToWrite) == 1);
+  int Line = 1; // The current input file line number.
+
+  Token RawToken;
+  RawLex.LexFromRawLexer(RawToken);
+
+  // TODO: Consider adding a switch that strips possibly unimportant content,
+  // such as comments, to reduce the size of repro files.
+  while (RawToken.isNot(tok::eof)) {
+    if (RawToken.is(tok::hash) && RawToken.isAtStartOfLine()) {
+      RawLex.setParsingPreprocessorDirective(true);
+      Token HashToken = RawToken;
+      RawLex.LexFromRawLexer(RawToken);
+      if (RawToken.is(tok::raw_identifier))
+        PP.LookUpIdentifierInfo(RawToken);
+      if (RawToken.getIdentifierInfo() != nullptr) {
+        switch (RawToken.getIdentifierInfo()->getPPKeywordID()) {
+          case tok::pp_include:
+          case tok::pp_include_next:
+          case tok::pp_import: {
+            CommentOutDirective(RawLex, HashToken, FromFile, LocalEOL, NextToWrite,
+              Line);
+            if (FileId != PP.getPredefinesFileID())
+              WriteLineInfo(FileName, Line - 1, FileType, "");
+            StringRef LineInfoExtra;
+            SourceLocation Loc = HashToken.getLocation();
+            if (const Module *Mod = FindModuleAtLocation(Loc))
+              WriteImplicitModuleImport(Mod);
+            else if (const IncludedFile *Inc = FindIncludeAtLocation(Loc)) {
+              const Module *Mod = FindEnteredModule(Loc);
+              if (Mod)
+                OS << "#pragma clang module begin "
+                   << Mod->getFullModuleName(true) << "\n";
+
+              // Include and recursively process the file.
+              Process(Inc->Id, Inc->FileType);
+
+              if (Mod)
+                OS << "#pragma clang module end /*"
+                   << Mod->getFullModuleName(true) << "*/\n";
+
+              // Add line marker to indicate we're returning from an included
+              // file.
+              LineInfoExtra = " 2";
+            }
+            // fix up lineinfo (since commented out directive changed line
+            // numbers) for inclusions that were skipped due to header guards
+            WriteLineInfo(FileName, Line, FileType, LineInfoExtra);
+            break;
+          }
+          case tok::pp_pragma: {
+            StringRef Identifier = NextIdentifierName(RawLex, RawToken);
+            if (Identifier == "clang" || Identifier == "GCC") {
+              if (NextIdentifierName(RawLex, RawToken) == "system_header") {
+                // keep the directive in, commented out
+                CommentOutDirective(RawLex, HashToken, FromFile, LocalEOL,
+                  NextToWrite, Line);
+                // update our own type
+                FileType = SM.getFileCharacteristic(RawToken.getLocation());
+                WriteLineInfo(FileName, Line, FileType);
+              }
+            } else if (Identifier == "once") {
+              // keep the directive in, commented out
+              CommentOutDirective(RawLex, HashToken, FromFile, LocalEOL,
+                NextToWrite, Line);
+              WriteLineInfo(FileName, Line, FileType);
+            }
+            break;
+          }
+          case tok::pp_if:
+          case tok::pp_elif: {
+            bool elif = (RawToken.getIdentifierInfo()->getPPKeywordID() ==
+                         tok::pp_elif);
+            bool isTrue = IsIfAtLocationTrue(RawToken.getLocation());
+            OutputContentUpTo(FromFile, NextToWrite,
+                              SM.getFileOffset(HashToken.getLocation()),
+                              LocalEOL, Line, /*EnsureNewline=*/true);
+            do {
+              RawLex.LexFromRawLexer(RawToken);
+            } while (!RawToken.is(tok::eod) && RawToken.isNot(tok::eof));
+            // We need to disable the old condition, but that is tricky.
+            // Trying to comment it out can easily lead to comment nesting.
+            // So instead make the condition harmless by making it enclose
+            // and empty block. Moreover, put it itself inside an #if 0 block
+            // to disable it from getting evaluated (e.g. __has_include_next
+            // warns if used from the primary source file).
+            OS << "#if 0 /* disabled by -frewrite-includes */" << MainEOL;
+            if (elif) {
+              OS << "#if 0" << MainEOL;
+            }
+            OutputContentUpTo(FromFile, NextToWrite,
+                              SM.getFileOffset(RawToken.getLocation()) +
+                                  RawToken.getLength(),
+                              LocalEOL, Line, /*EnsureNewline=*/true);
+            // Close the empty block and the disabling block.
+            OS << "#endif" << MainEOL;
+            OS << "#endif /* disabled by -frewrite-includes */" << MainEOL;
+            OS << (elif ? "#elif " : "#if ") << (isTrue ? "1" : "0")
+               << " /* evaluated by -frewrite-includes */" << MainEOL;
+            WriteLineInfo(FileName, Line, FileType);
+            break;
+          }
+          case tok::pp_endif:
+          case tok::pp_else: {
+            // We surround every #include by #if 0 to comment it out, but that
+            // changes line numbers. These are fixed up right after that, but
+            // the whole #include could be inside a preprocessor conditional
+            // that is not processed. So it is necessary to fix the line
+            // numbers one the next line after each #else/#endif as well.
+            RawLex.SetKeepWhitespaceMode(true);
+            do {
+              RawLex.LexFromRawLexer(RawToken);
+            } while (RawToken.isNot(tok::eod) && RawToken.isNot(tok::eof));
+            OutputContentUpTo(FromFile, NextToWrite,
+                              SM.getFileOffset(RawToken.getLocation()) +
+                                  RawToken.getLength(),
+                              LocalEOL, Line, /*EnsureNewline=*/ true);
+            WriteLineInfo(FileName, Line, FileType);
+            RawLex.SetKeepWhitespaceMode(false);
+            break;
+          }
+          default:
+            break;
+        }
+      }
+      RawLex.setParsingPreprocessorDirective(false);
+    }
+    RawLex.LexFromRawLexer(RawToken);
+  }
+  OutputContentUpTo(FromFile, NextToWrite,
+                    SM.getFileOffset(SM.getLocForEndOfFile(FileId)), LocalEOL,
+                    Line, /*EnsureNewline=*/true);
+}
+
+/// InclusionRewriterInInput - Implement -frewrite-includes mode.
+void clang::RewriteIncludesInInput(Preprocessor &PP, raw_ostream *OS,
+                                   const PreprocessorOutputOptions &Opts) {
+  SourceManager &SM = PP.getSourceManager();
+  InclusionRewriter *Rewrite = new InclusionRewriter(
+      PP, *OS, Opts.ShowLineMarkers, Opts.UseLineDirectives);
+  Rewrite->detectMainFileEOL();
+
+  PP.addPPCallbacks(std::unique_ptr<PPCallbacks>(Rewrite));
+  PP.IgnorePragmas();
+
+  // First let the preprocessor process the entire file and call callbacks.
+  // Callbacks will record which #include's were actually performed.
+  PP.EnterMainSourceFile();
+  Token Tok;
+  // Only preprocessor directives matter here, so disable macro expansion
+  // everywhere else as an optimization.
+  // TODO: It would be even faster if the preprocessor could be switched
+  // to a mode where it would parse only preprocessor directives and comments,
+  // nothing else matters for parsing or processing.
+  PP.SetMacroExpansionOnlyInDirectives();
+  do {
+    PP.Lex(Tok);
+    if (Tok.is(tok::annot_module_begin))
+      Rewrite->handleModuleBegin(Tok);
+  } while (Tok.isNot(tok::eof));
+  Rewrite->setPredefinesBuffer(SM.getBufferOrFake(PP.getPredefinesFileID()));
+  Rewrite->Process(PP.getPredefinesFileID(), SrcMgr::C_User);
+  Rewrite->Process(SM.getMainFileID(), SrcMgr::C_User);
+  OS->flush();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteMacros.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteMacros.cpp
new file mode 100644
index 0000000000..5701b271af
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteMacros.cpp
@@ -0,0 +1,216 @@
+//===--- RewriteMacros.cpp - Rewrite macros into their expansions ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This code rewrites macro invocations into their expansions.  This gives you
+// a macro expanded file that retains comments and #includes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Frontend/Rewriters.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdio>
+#include <memory>
+
+using namespace clang;
+
+/// isSameToken - Return true if the two specified tokens start have the same
+/// content.
+static bool isSameToken(Token &RawTok, Token &PPTok) {
+  // If two tokens have the same kind and the same identifier info, they are
+  // obviously the same.
+  if (PPTok.getKind() == RawTok.getKind() &&
+      PPTok.getIdentifierInfo() == RawTok.getIdentifierInfo())
+    return true;
+
+  // Otherwise, if they are different but have the same identifier info, they
+  // are also considered to be the same.  This allows keywords and raw lexed
+  // identifiers with the same name to be treated the same.
+  if (PPTok.getIdentifierInfo() &&
+      PPTok.getIdentifierInfo() == RawTok.getIdentifierInfo())
+    return true;
+
+  return false;
+}
+
+
+/// GetNextRawTok - Return the next raw token in the stream, skipping over
+/// comments if ReturnComment is false.
+static const Token &GetNextRawTok(const std::vector<Token> &RawTokens,
+                                  unsigned &CurTok, bool ReturnComment) {
+  assert(CurTok < RawTokens.size() && "Overran eof!");
+
+  // If the client doesn't want comments and we have one, skip it.
+  if (!ReturnComment && RawTokens[CurTok].is(tok::comment))
+    ++CurTok;
+
+  return RawTokens[CurTok++];
+}
+
+
+/// LexRawTokensFromMainFile - Lets all the raw tokens from the main file into
+/// the specified vector.
+static void LexRawTokensFromMainFile(Preprocessor &PP,
+                                     std::vector<Token> &RawTokens) {
+  SourceManager &SM = PP.getSourceManager();
+
+  // Create a lexer to lex all the tokens of the main file in raw mode.  Even
+  // though it is in raw mode, it will not return comments.
+  llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(SM.getMainFileID());
+  Lexer RawLex(SM.getMainFileID(), FromFile, SM, PP.getLangOpts());
+
+  // Switch on comment lexing because we really do want them.
+  RawLex.SetCommentRetentionState(true);
+
+  Token RawTok;
+  do {
+    RawLex.LexFromRawLexer(RawTok);
+
+    // If we have an identifier with no identifier info for our raw token, look
+    // up the identifier info.  This is important for equality comparison of
+    // identifier tokens.
+    if (RawTok.is(tok::raw_identifier))
+      PP.LookUpIdentifierInfo(RawTok);
+
+    RawTokens.push_back(RawTok);
+  } while (RawTok.isNot(tok::eof));
+}
+
+
+/// RewriteMacrosInInput - Implement -rewrite-macros mode.
+void clang::RewriteMacrosInInput(Preprocessor &PP, raw_ostream *OS) {
+  SourceManager &SM = PP.getSourceManager();
+
+  Rewriter Rewrite;
+  Rewrite.setSourceMgr(SM, PP.getLangOpts());
+  RewriteBuffer &RB = Rewrite.getEditBuffer(SM.getMainFileID());
+
+  std::vector<Token> RawTokens;
+  LexRawTokensFromMainFile(PP, RawTokens);
+  unsigned CurRawTok = 0;
+  Token RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+
+
+  // Get the first preprocessing token.
+  PP.EnterMainSourceFile();
+  Token PPTok;
+  PP.Lex(PPTok);
+
+  // Preprocess the input file in parallel with raw lexing the main file. Ignore
+  // all tokens that are preprocessed from a file other than the main file (e.g.
+  // a header).  If we see tokens that are in the preprocessed file but not the
+  // lexed file, we have a macro expansion.  If we see tokens in the lexed file
+  // that aren't in the preprocessed view, we have macros that expand to no
+  // tokens, or macro arguments etc.
+  while (RawTok.isNot(tok::eof) || PPTok.isNot(tok::eof)) {
+    SourceLocation PPLoc = SM.getExpansionLoc(PPTok.getLocation());
+
+    // If PPTok is from a different source file, ignore it.
+    if (!SM.isWrittenInMainFile(PPLoc)) {
+      PP.Lex(PPTok);
+      continue;
+    }
+
+    // If the raw file hits a preprocessor directive, they will be extra tokens
+    // in the raw file that don't exist in the preprocsesed file.  However, we
+    // choose to preserve them in the output file and otherwise handle them
+    // specially.
+    if (RawTok.is(tok::hash) && RawTok.isAtStartOfLine()) {
+      // If this is a #warning directive or #pragma mark (GNU extensions),
+      // comment the line out.
+      if (RawTokens[CurRawTok].is(tok::identifier)) {
+        const IdentifierInfo *II = RawTokens[CurRawTok].getIdentifierInfo();
+        if (II->getName() == "warning") {
+          // Comment out #warning.
+          RB.InsertTextAfter(SM.getFileOffset(RawTok.getLocation()), "//");
+        } else if (II->getName() == "pragma" &&
+                   RawTokens[CurRawTok+1].is(tok::identifier) &&
+                   (RawTokens[CurRawTok+1].getIdentifierInfo()->getName() ==
+                    "mark")) {
+          // Comment out #pragma mark.
+          RB.InsertTextAfter(SM.getFileOffset(RawTok.getLocation()), "//");
+        }
+      }
+
+      // Otherwise, if this is a #include or some other directive, just leave it
+      // in the file by skipping over the line.
+      RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+      while (!RawTok.isAtStartOfLine() && RawTok.isNot(tok::eof))
+        RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+      continue;
+    }
+
+    // Okay, both tokens are from the same file.  Get their offsets from the
+    // start of the file.
+    unsigned PPOffs = SM.getFileOffset(PPLoc);
+    unsigned RawOffs = SM.getFileOffset(RawTok.getLocation());
+
+    // If the offsets are the same and the token kind is the same, ignore them.
+    if (PPOffs == RawOffs && isSameToken(RawTok, PPTok)) {
+      RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+      PP.Lex(PPTok);
+      continue;
+    }
+
+    // If the PP token is farther along than the raw token, something was
+    // deleted.  Comment out the raw token.
+    if (RawOffs <= PPOffs) {
+      // Comment out a whole run of tokens instead of bracketing each one with
+      // comments.  Add a leading space if RawTok didn't have one.
+      bool HasSpace = RawTok.hasLeadingSpace();
+      RB.InsertTextAfter(RawOffs, &" /*"[HasSpace]);
+      unsigned EndPos;
+
+      do {
+        EndPos = RawOffs+RawTok.getLength();
+
+        RawTok = GetNextRawTok(RawTokens, CurRawTok, true);
+        RawOffs = SM.getFileOffset(RawTok.getLocation());
+
+        if (RawTok.is(tok::comment)) {
+          // Skip past the comment.
+          RawTok = GetNextRawTok(RawTokens, CurRawTok, false);
+          break;
+        }
+
+      } while (RawOffs <= PPOffs && !RawTok.isAtStartOfLine() &&
+               (PPOffs != RawOffs || !isSameToken(RawTok, PPTok)));
+
+      RB.InsertTextBefore(EndPos, "*/");
+      continue;
+    }
+
+    // Otherwise, there was a replacement an expansion.  Insert the new token
+    // in the output buffer.  Insert the whole run of new tokens at once to get
+    // them in the right order.
+    unsigned InsertPos = PPOffs;
+    std::string Expansion;
+    while (PPOffs < RawOffs) {
+      Expansion += ' ' + PP.getSpelling(PPTok);
+      PP.Lex(PPTok);
+      PPLoc = SM.getExpansionLoc(PPTok.getLocation());
+      PPOffs = SM.getFileOffset(PPLoc);
+    }
+    Expansion += ' ';
+    RB.InsertTextBefore(InsertPos, Expansion);
+  }
+
+  // Get the buffer corresponding to MainFileID.  If we haven't changed it, then
+  // we are done.
+  if (const RewriteBuffer *RewriteBuf =
+      Rewrite.getRewriteBufferFor(SM.getMainFileID())) {
+    //printf("Changed:\n");
+    *OS << std::string(RewriteBuf->begin(), RewriteBuf->end());
+  } else {
+    fprintf(stderr, "No changes\n");
+  }
+  OS->flush();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteModernObjC.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteModernObjC.cpp
new file mode 100644
index 0000000000..b4487f0047
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteModernObjC.cpp
@@ -0,0 +1,7569 @@
+//===-- RewriteModernObjC.cpp - Playground for the code rewriter ----------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Hacks and fun related to the code rewriter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Frontend/ASTConsumers.h"
+#include "clang/AST/AST.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/Attr.h"
+#include "clang/AST/ParentMap.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Config/config.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <memory>
+
+#if CLANG_ENABLE_OBJC_REWRITER
+
+using namespace clang;
+using llvm::utostr;
+
+namespace {
+  class RewriteModernObjC : public ASTConsumer {
+  protected:
+
+    enum {
+      BLOCK_FIELD_IS_OBJECT   =  3,  /* id, NSObject, __attribute__((NSObject)),
+                                        block, ... */
+      BLOCK_FIELD_IS_BLOCK    =  7,  /* a block variable */
+      BLOCK_FIELD_IS_BYREF    =  8,  /* the on stack structure holding the
+                                        __block variable */
+      BLOCK_FIELD_IS_WEAK     = 16,  /* declared __weak, only used in byref copy
+                                        helpers */
+      BLOCK_BYREF_CALLER      = 128, /* called from __block (byref) copy/dispose
+                                        support routines */
+      BLOCK_BYREF_CURRENT_MAX = 256
+    };
+
+    enum {
+      BLOCK_NEEDS_FREE =        (1 << 24),
+      BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
+      BLOCK_HAS_CXX_OBJ =       (1 << 26),
+      BLOCK_IS_GC =             (1 << 27),
+      BLOCK_IS_GLOBAL =         (1 << 28),
+      BLOCK_HAS_DESCRIPTOR =    (1 << 29)
+    };
+
+    Rewriter Rewrite;
+    DiagnosticsEngine &Diags;
+    const LangOptions &LangOpts;
+    ASTContext *Context;
+    SourceManager *SM;
+    TranslationUnitDecl *TUDecl;
+    FileID MainFileID;
+    const char *MainFileStart, *MainFileEnd;
+    Stmt *CurrentBody;
+    ParentMap *PropParentMap; // created lazily.
+    std::string InFileName;
+    std::unique_ptr<raw_ostream> OutFile;
+    std::string Preamble;
+
+    TypeDecl *ProtocolTypeDecl;
+    VarDecl *GlobalVarDecl;
+    Expr *GlobalConstructionExp;
+    unsigned RewriteFailedDiag;
+    unsigned GlobalBlockRewriteFailedDiag;
+    // ObjC string constant support.
+    unsigned NumObjCStringLiterals;
+    VarDecl *ConstantStringClassReference;
+    RecordDecl *NSStringRecord;
+
+    // ObjC foreach break/continue generation support.
+    int BcLabelCount;
+
+    unsigned TryFinallyContainsReturnDiag;
+    // Needed for super.
+    ObjCMethodDecl *CurMethodDef;
+    RecordDecl *SuperStructDecl;
+    RecordDecl *ConstantStringDecl;
+
+    FunctionDecl *MsgSendFunctionDecl;
+    FunctionDecl *MsgSendSuperFunctionDecl;
+    FunctionDecl *MsgSendStretFunctionDecl;
+    FunctionDecl *MsgSendSuperStretFunctionDecl;
+    FunctionDecl *MsgSendFpretFunctionDecl;
+    FunctionDecl *GetClassFunctionDecl;
+    FunctionDecl *GetMetaClassFunctionDecl;
+    FunctionDecl *GetSuperClassFunctionDecl;
+    FunctionDecl *SelGetUidFunctionDecl;
+    FunctionDecl *CFStringFunctionDecl;
+    FunctionDecl *SuperConstructorFunctionDecl;
+    FunctionDecl *CurFunctionDef;
+
+    /* Misc. containers needed for meta-data rewrite. */
+    SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
+    SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
+    llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
+    llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
+    llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCWrittenInterfaces;
+    llvm::SmallPtrSet<TagDecl*, 32> GlobalDefinedTags;
+    SmallVector<ObjCInterfaceDecl*, 32> ObjCInterfacesSeen;
+    /// DefinedNonLazyClasses - List of defined "non-lazy" classes.
+    SmallVector<ObjCInterfaceDecl*, 8> DefinedNonLazyClasses;
+
+    /// DefinedNonLazyCategories - List of defined "non-lazy" categories.
+    SmallVector<ObjCCategoryDecl *, 8> DefinedNonLazyCategories;
+
+    SmallVector<Stmt *, 32> Stmts;
+    SmallVector<int, 8> ObjCBcLabelNo;
+    // Remember all the @protocol(<expr>) expressions.
+    llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
+
+    llvm::DenseSet<uint64_t> CopyDestroyCache;
+
+    // Block expressions.
+    SmallVector<BlockExpr *, 32> Blocks;
+    SmallVector<int, 32> InnerDeclRefsCount;
+    SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
+
+    SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
+
+    // Block related declarations.
+    SmallVector<ValueDecl *, 8> BlockByCopyDecls;
+    llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
+    SmallVector<ValueDecl *, 8> BlockByRefDecls;
+    llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
+    llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
+    llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
+    llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
+
+    llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
+    llvm::DenseMap<ObjCInterfaceDecl *,
+                    llvm::SmallSetVector<ObjCIvarDecl *, 8> > ReferencedIvars;
+
+    // ivar bitfield grouping containers
+    llvm::DenseSet<const ObjCInterfaceDecl *> ObjCInterefaceHasBitfieldGroups;
+    llvm::DenseMap<const ObjCIvarDecl* , unsigned> IvarGroupNumber;
+    // This container maps an <class, group number for ivar> tuple to the type
+    // of the struct where the bitfield belongs.
+    llvm::DenseMap<std::pair<const ObjCInterfaceDecl*, unsigned>, QualType> GroupRecordType;
+    SmallVector<FunctionDecl*, 32> FunctionDefinitionsSeen;
+
+    // This maps an original source AST to it's rewritten form. This allows
+    // us to avoid rewriting the same node twice (which is very uncommon).
+    // This is needed to support some of the exotic property rewriting.
+    llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
+
+    // Needed for header files being rewritten
+    bool IsHeader;
+    bool SilenceRewriteMacroWarning;
+    bool GenerateLineInfo;
+    bool objc_impl_method;
+
+    bool DisableReplaceStmt;
+    class DisableReplaceStmtScope {
+      RewriteModernObjC &R;
+      bool SavedValue;
+
+    public:
+      DisableReplaceStmtScope(RewriteModernObjC &R)
+        : R(R), SavedValue(R.DisableReplaceStmt) {
+        R.DisableReplaceStmt = true;
+      }
+      ~DisableReplaceStmtScope() {
+        R.DisableReplaceStmt = SavedValue;
+      }
+    };
+    void InitializeCommon(ASTContext &context);
+
+  public:
+    llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
+
+    // Top Level Driver code.
+    bool HandleTopLevelDecl(DeclGroupRef D) override {
+      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
+        if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(*I)) {
+          if (!Class->isThisDeclarationADefinition()) {
+            RewriteForwardClassDecl(D);
+            break;
+          } else {
+            // Keep track of all interface declarations seen.
+            ObjCInterfacesSeen.push_back(Class);
+            break;
+          }
+        }
+
+        if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>(*I)) {
+          if (!Proto->isThisDeclarationADefinition()) {
+            RewriteForwardProtocolDecl(D);
+            break;
+          }
+        }
+
+        if (FunctionDecl *FDecl = dyn_cast<FunctionDecl>(*I)) {
+          // Under modern abi, we cannot translate body of the function
+          // yet until all class extensions and its implementation is seen.
+          // This is because they may introduce new bitfields which must go
+          // into their grouping struct.
+          if (FDecl->isThisDeclarationADefinition() &&
+              // Not c functions defined inside an objc container.
+              !FDecl->isTopLevelDeclInObjCContainer()) {
+            FunctionDefinitionsSeen.push_back(FDecl);
+            break;
+          }
+        }
+        HandleTopLevelSingleDecl(*I);
+      }
+      return true;
+    }
+
+    void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
+      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
+        if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(*I)) {
+          if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+            RewriteBlockPointerDecl(TD);
+          else if (TD->getUnderlyingType()->isFunctionPointerType())
+            CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+          else
+            RewriteObjCQualifiedInterfaceTypes(TD);
+        }
+      }
+    }
+
+    void HandleTopLevelSingleDecl(Decl *D);
+    void HandleDeclInMainFile(Decl *D);
+    RewriteModernObjC(std::string inFile, std::unique_ptr<raw_ostream> OS,
+                      DiagnosticsEngine &D, const LangOptions &LOpts,
+                      bool silenceMacroWarn, bool LineInfo);
+
+    ~RewriteModernObjC() override {}
+
+    void HandleTranslationUnit(ASTContext &C) override;
+
+    void ReplaceStmt(Stmt *Old, Stmt *New) {
+      ReplaceStmtWithRange(Old, New, Old->getSourceRange());
+    }
+
+    void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
+      assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
+
+      Stmt *ReplacingStmt = ReplacedNodes[Old];
+      if (ReplacingStmt)
+        return; // We can't rewrite the same node twice.
+
+      if (DisableReplaceStmt)
+        return;
+
+      // Measure the old text.
+      int Size = Rewrite.getRangeSize(SrcRange);
+      if (Size == -1) {
+        Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
+            << Old->getSourceRange();
+        return;
+      }
+      // Get the new text.
+      std::string SStr;
+      llvm::raw_string_ostream S(SStr);
+      New->printPretty(S, nullptr, PrintingPolicy(LangOpts));
+      const std::string &Str = S.str();
+
+      // If replacement succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
+        ReplacedNodes[Old] = New;
+        return;
+      }
+      if (SilenceRewriteMacroWarning)
+        return;
+      Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
+          << Old->getSourceRange();
+    }
+
+    void InsertText(SourceLocation Loc, StringRef Str,
+                    bool InsertAfter = true) {
+      // If insertion succeeded or warning disabled return with no warning.
+      if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
+          SilenceRewriteMacroWarning)
+        return;
+
+      Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
+    }
+
+    void ReplaceText(SourceLocation Start, unsigned OrigLength,
+                     StringRef Str) {
+      // If removal succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceText(Start, OrigLength, Str) ||
+          SilenceRewriteMacroWarning)
+        return;
+
+      Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
+    }
+
+    // Syntactic Rewriting.
+    void RewriteRecordBody(RecordDecl *RD);
+    void RewriteInclude();
+    void RewriteLineDirective(const Decl *D);
+    void ConvertSourceLocationToLineDirective(SourceLocation Loc,
+                                              std::string &LineString);
+    void RewriteForwardClassDecl(DeclGroupRef D);
+    void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
+    void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
+                                     const std::string &typedefString);
+    void RewriteImplementations();
+    void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
+                                 ObjCImplementationDecl *IMD,
+                                 ObjCCategoryImplDecl *CID);
+    void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
+    void RewriteImplementationDecl(Decl *Dcl);
+    void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
+                               ObjCMethodDecl *MDecl, std::string &ResultStr);
+    void RewriteTypeIntoString(QualType T, std::string &ResultStr,
+                               const FunctionType *&FPRetType);
+    void RewriteByRefString(std::string &ResultStr, const std::string &Name,
+                            ValueDecl *VD, bool def=false);
+    void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
+    void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
+    void RewriteForwardProtocolDecl(DeclGroupRef D);
+    void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
+    void RewriteMethodDeclaration(ObjCMethodDecl *Method);
+    void RewriteProperty(ObjCPropertyDecl *prop);
+    void RewriteFunctionDecl(FunctionDecl *FD);
+    void RewriteBlockPointerType(std::string& Str, QualType Type);
+    void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
+    void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
+    void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
+    void RewriteTypeOfDecl(VarDecl *VD);
+    void RewriteObjCQualifiedInterfaceTypes(Expr *E);
+
+    std::string getIvarAccessString(ObjCIvarDecl *D);
+
+    // Expression Rewriting.
+    Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
+    Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
+    Stmt *RewritePropertyOrImplicitGetter(PseudoObjectExpr *Pseudo);
+    Stmt *RewritePropertyOrImplicitSetter(PseudoObjectExpr *Pseudo);
+    Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
+    Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
+    Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
+    Stmt *RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp);
+    Stmt *RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp);
+    Stmt *RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp);
+    Stmt *RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp);
+    Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
+    Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
+    Stmt *RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt  *S);
+    Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
+    Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
+    Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
+                                       SourceLocation OrigEnd);
+    Stmt *RewriteBreakStmt(BreakStmt *S);
+    Stmt *RewriteContinueStmt(ContinueStmt *S);
+    void RewriteCastExpr(CStyleCastExpr *CE);
+    void RewriteImplicitCastObjCExpr(CastExpr *IE);
+
+    // Computes ivar bitfield group no.
+    unsigned ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV);
+    // Names field decl. for ivar bitfield group.
+    void ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV, std::string &Result);
+    // Names struct type for ivar bitfield group.
+    void ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV, std::string &Result);
+    // Names symbol for ivar bitfield group field offset.
+    void ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV, std::string &Result);
+    // Given an ivar bitfield, it builds (or finds) its group record type.
+    QualType GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV);
+    QualType SynthesizeBitfieldGroupStructType(
+                                    ObjCIvarDecl *IV,
+                                    SmallVectorImpl<ObjCIvarDecl *> &IVars);
+
+    // Block rewriting.
+    void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
+
+    // Block specific rewrite rules.
+    void RewriteBlockPointerDecl(NamedDecl *VD);
+    void RewriteByRefVar(VarDecl *VD, bool firstDecl, bool lastDecl);
+    Stmt *RewriteBlockDeclRefExpr(DeclRefExpr *VD);
+    Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
+    void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
+
+    void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
+                                      std::string &Result);
+
+    void RewriteObjCFieldDecl(FieldDecl *fieldDecl, std::string &Result);
+    bool IsTagDefinedInsideClass(ObjCContainerDecl *IDecl, TagDecl *Tag,
+                                 bool &IsNamedDefinition);
+    void RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
+                                              std::string &Result);
+
+    bool RewriteObjCFieldDeclType(QualType &Type, std::string &Result);
+
+    void RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
+                                  std::string &Result);
+
+    void Initialize(ASTContext &context) override;
+
+    // Misc. AST transformation routines. Sometimes they end up calling
+    // rewriting routines on the new ASTs.
+    CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
+                                           ArrayRef<Expr *> Args,
+                                           SourceLocation StartLoc=SourceLocation(),
+                                           SourceLocation EndLoc=SourceLocation());
+
+    Expr *SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
+                                        QualType returnType,
+                                        SmallVectorImpl<QualType> &ArgTypes,
+                                        SmallVectorImpl<Expr*> &MsgExprs,
+                                        ObjCMethodDecl *Method);
+
+    Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
+                           SourceLocation StartLoc=SourceLocation(),
+                           SourceLocation EndLoc=SourceLocation());
+
+    void SynthCountByEnumWithState(std::string &buf);
+    void SynthMsgSendFunctionDecl();
+    void SynthMsgSendSuperFunctionDecl();
+    void SynthMsgSendStretFunctionDecl();
+    void SynthMsgSendFpretFunctionDecl();
+    void SynthMsgSendSuperStretFunctionDecl();
+    void SynthGetClassFunctionDecl();
+    void SynthGetMetaClassFunctionDecl();
+    void SynthGetSuperClassFunctionDecl();
+    void SynthSelGetUidFunctionDecl();
+    void SynthSuperConstructorFunctionDecl();
+
+    // Rewriting metadata
+    template<typename MethodIterator>
+    void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
+                                    MethodIterator MethodEnd,
+                                    bool IsInstanceMethod,
+                                    StringRef prefix,
+                                    StringRef ClassName,
+                                    std::string &Result);
+    void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
+                                     std::string &Result);
+    void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                          std::string &Result);
+    void RewriteClassSetupInitHook(std::string &Result);
+
+    void RewriteMetaDataIntoBuffer(std::string &Result);
+    void WriteImageInfo(std::string &Result);
+    void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
+                                             std::string &Result);
+    void RewriteCategorySetupInitHook(std::string &Result);
+
+    // Rewriting ivar
+    void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                              std::string &Result);
+    Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV);
+
+
+    std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
+    std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
+                                      StringRef funcName, std::string Tag);
+    std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
+                                      StringRef funcName, std::string Tag);
+    std::string SynthesizeBlockImpl(BlockExpr *CE,
+                                    std::string Tag, std::string Desc);
+    std::string SynthesizeBlockDescriptor(std::string DescTag,
+                                          std::string ImplTag,
+                                          int i, StringRef funcName,
+                                          unsigned hasCopy);
+    Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
+    void SynthesizeBlockLiterals(SourceLocation FunLocStart,
+                                 StringRef FunName);
+    FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
+    Stmt *SynthBlockInitExpr(BlockExpr *Exp,
+                      const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
+
+    // Misc. helper routines.
+    QualType getProtocolType();
+    void WarnAboutReturnGotoStmts(Stmt *S);
+    void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
+    void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
+    void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
+
+    bool IsDeclStmtInForeachHeader(DeclStmt *DS);
+    void CollectBlockDeclRefInfo(BlockExpr *Exp);
+    void GetBlockDeclRefExprs(Stmt *S);
+    void GetInnerBlockDeclRefExprs(Stmt *S,
+                SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
+                llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts);
+
+    // We avoid calling Type::isBlockPointerType(), since it operates on the
+    // canonical type. We only care if the top-level type is a closure pointer.
+    bool isTopLevelBlockPointerType(QualType T) {
+      return isa<BlockPointerType>(T);
+    }
+
+    /// convertBlockPointerToFunctionPointer - Converts a block-pointer type
+    /// to a function pointer type and upon success, returns true; false
+    /// otherwise.
+    bool convertBlockPointerToFunctionPointer(QualType &T) {
+      if (isTopLevelBlockPointerType(T)) {
+        const auto *BPT = T->castAs<BlockPointerType>();
+        T = Context->getPointerType(BPT->getPointeeType());
+        return true;
+      }
+      return false;
+    }
+
+    bool convertObjCTypeToCStyleType(QualType &T);
+
+    bool needToScanForQualifiers(QualType T);
+    QualType getSuperStructType();
+    QualType getConstantStringStructType();
+    QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
+
+    void convertToUnqualifiedObjCType(QualType &T) {
+      if (T->isObjCQualifiedIdType()) {
+        bool isConst = T.isConstQualified();
+        T = isConst ? Context->getObjCIdType().withConst()
+                    : Context->getObjCIdType();
+      }
+      else if (T->isObjCQualifiedClassType())
+        T = Context->getObjCClassType();
+      else if (T->isObjCObjectPointerType() &&
+               T->getPointeeType()->isObjCQualifiedInterfaceType()) {
+        if (const ObjCObjectPointerType * OBJPT =
+              T->getAsObjCInterfacePointerType()) {
+          const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
+          T = QualType(IFaceT, 0);
+          T = Context->getPointerType(T);
+        }
+     }
+    }
+
+    // FIXME: This predicate seems like it would be useful to add to ASTContext.
+    bool isObjCType(QualType T) {
+      if (!LangOpts.ObjC)
+        return false;
+
+      QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
+
+      if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
+          OCT == Context->getCanonicalType(Context->getObjCClassType()))
+        return true;
+
+      if (const PointerType *PT = OCT->getAs<PointerType>()) {
+        if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
+            PT->getPointeeType()->isObjCQualifiedIdType())
+          return true;
+      }
+      return false;
+    }
+
+    bool PointerTypeTakesAnyBlockArguments(QualType QT);
+    bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
+    void GetExtentOfArgList(const char *Name, const char *&LParen,
+                            const char *&RParen);
+
+    void QuoteDoublequotes(std::string &From, std::string &To) {
+      for (unsigned i = 0; i < From.length(); i++) {
+        if (From[i] == '"')
+          To += "\\\"";
+        else
+          To += From[i];
+      }
+    }
+
+    QualType getSimpleFunctionType(QualType result,
+                                   ArrayRef<QualType> args,
+                                   bool variadic = false) {
+      if (result == Context->getObjCInstanceType())
+        result =  Context->getObjCIdType();
+      FunctionProtoType::ExtProtoInfo fpi;
+      fpi.Variadic = variadic;
+      return Context->getFunctionType(result, args, fpi);
+    }
+
+    // Helper function: create a CStyleCastExpr with trivial type source info.
+    CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
+                                             CastKind Kind, Expr *E) {
+      TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(Ty, SourceLocation());
+      return CStyleCastExpr::Create(*Ctx, Ty, VK_PRValue, Kind, E, nullptr,
+                                    FPOptionsOverride(), TInfo,
+                                    SourceLocation(), SourceLocation());
+    }
+
+    bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
+      IdentifierInfo* II = &Context->Idents.get("load");
+      Selector LoadSel = Context->Selectors.getSelector(0, &II);
+      return OD->getClassMethod(LoadSel) != nullptr;
+    }
+
+    StringLiteral *getStringLiteral(StringRef Str) {
+      QualType StrType = Context->getConstantArrayType(
+          Context->CharTy, llvm::APInt(32, Str.size() + 1), nullptr,
+          ArrayType::Normal, 0);
+      return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
+                                   /*Pascal=*/false, StrType, SourceLocation());
+    }
+  };
+} // end anonymous namespace
+
+void RewriteModernObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
+                                                   NamedDecl *D) {
+  if (const FunctionProtoType *fproto
+      = dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
+    for (const auto &I : fproto->param_types())
+      if (isTopLevelBlockPointerType(I)) {
+        // All the args are checked/rewritten. Don't call twice!
+        RewriteBlockPointerDecl(D);
+        break;
+      }
+  }
+}
+
+void RewriteModernObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
+  const PointerType *PT = funcType->getAs<PointerType>();
+  if (PT && PointerTypeTakesAnyBlockArguments(funcType))
+    RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
+}
+
+static bool IsHeaderFile(const std::string &Filename) {
+  std::string::size_type DotPos = Filename.rfind('.');
+
+  if (DotPos == std::string::npos) {
+    // no file extension
+    return false;
+  }
+
+  std::string Ext = Filename.substr(DotPos + 1);
+  // C header: .h
+  // C++ header: .hh or .H;
+  return Ext == "h" || Ext == "hh" || Ext == "H";
+}
+
+RewriteModernObjC::RewriteModernObjC(std::string inFile,
+                                     std::unique_ptr<raw_ostream> OS,
+                                     DiagnosticsEngine &D,
+                                     const LangOptions &LOpts,
+                                     bool silenceMacroWarn, bool LineInfo)
+    : Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(std::move(OS)),
+      SilenceRewriteMacroWarning(silenceMacroWarn), GenerateLineInfo(LineInfo) {
+  IsHeader = IsHeaderFile(inFile);
+  RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
+               "rewriting sub-expression within a macro (may not be correct)");
+  // FIXME. This should be an error. But if block is not called, it is OK. And it
+  // may break including some headers.
+  GlobalBlockRewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
+    "rewriting block literal declared in global scope is not implemented");
+
+  TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
+               DiagnosticsEngine::Warning,
+               "rewriter doesn't support user-specified control flow semantics "
+               "for @try/@finally (code may not execute properly)");
+}
+
+std::unique_ptr<ASTConsumer> clang::CreateModernObjCRewriter(
+    const std::string &InFile, std::unique_ptr<raw_ostream> OS,
+    DiagnosticsEngine &Diags, const LangOptions &LOpts,
+    bool SilenceRewriteMacroWarning, bool LineInfo) {
+  return std::make_unique<RewriteModernObjC>(InFile, std::move(OS), Diags,
+                                              LOpts, SilenceRewriteMacroWarning,
+                                              LineInfo);
+}
+
+void RewriteModernObjC::InitializeCommon(ASTContext &context) {
+  Context = &context;
+  SM = &Context->getSourceManager();
+  TUDecl = Context->getTranslationUnitDecl();
+  MsgSendFunctionDecl = nullptr;
+  MsgSendSuperFunctionDecl = nullptr;
+  MsgSendStretFunctionDecl = nullptr;
+  MsgSendSuperStretFunctionDecl = nullptr;
+  MsgSendFpretFunctionDecl = nullptr;
+  GetClassFunctionDecl = nullptr;
+  GetMetaClassFunctionDecl = nullptr;
+  GetSuperClassFunctionDecl = nullptr;
+  SelGetUidFunctionDecl = nullptr;
+  CFStringFunctionDecl = nullptr;
+  ConstantStringClassReference = nullptr;
+  NSStringRecord = nullptr;
+  CurMethodDef = nullptr;
+  CurFunctionDef = nullptr;
+  GlobalVarDecl = nullptr;
+  GlobalConstructionExp = nullptr;
+  SuperStructDecl = nullptr;
+  ProtocolTypeDecl = nullptr;
+  ConstantStringDecl = nullptr;
+  BcLabelCount = 0;
+  SuperConstructorFunctionDecl = nullptr;
+  NumObjCStringLiterals = 0;
+  PropParentMap = nullptr;
+  CurrentBody = nullptr;
+  DisableReplaceStmt = false;
+  objc_impl_method = false;
+
+  // Get the ID and start/end of the main file.
+  MainFileID = SM->getMainFileID();
+  llvm::MemoryBufferRef MainBuf = SM->getBufferOrFake(MainFileID);
+  MainFileStart = MainBuf.getBufferStart();
+  MainFileEnd = MainBuf.getBufferEnd();
+
+  Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
+}
+
+//===----------------------------------------------------------------------===//
+// Top Level Driver Code
+//===----------------------------------------------------------------------===//
+
+void RewriteModernObjC::HandleTopLevelSingleDecl(Decl *D) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+  // Two cases: either the decl could be in the main file, or it could be in a
+  // #included file.  If the former, rewrite it now.  If the later, check to see
+  // if we rewrote the #include/#import.
+  SourceLocation Loc = D->getLocation();
+  Loc = SM->getExpansionLoc(Loc);
+
+  // If this is for a builtin, ignore it.
+  if (Loc.isInvalid()) return;
+
+  // Look for built-in declarations that we need to refer during the rewrite.
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+    RewriteFunctionDecl(FD);
+  } else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
+    // declared in <Foundation/NSString.h>
+    if (FVD->getName() == "_NSConstantStringClassReference") {
+      ConstantStringClassReference = FVD;
+      return;
+    }
+  } else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
+    RewriteCategoryDecl(CD);
+  } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
+    if (PD->isThisDeclarationADefinition())
+      RewriteProtocolDecl(PD);
+  } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
+    // Recurse into linkage specifications
+    for (DeclContext::decl_iterator DI = LSD->decls_begin(),
+                                 DIEnd = LSD->decls_end();
+         DI != DIEnd; ) {
+      if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>((*DI))) {
+        if (!IFace->isThisDeclarationADefinition()) {
+          SmallVector<Decl *, 8> DG;
+          SourceLocation StartLoc = IFace->getBeginLoc();
+          do {
+            if (isa<ObjCInterfaceDecl>(*DI) &&
+                !cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
+                StartLoc == (*DI)->getBeginLoc())
+              DG.push_back(*DI);
+            else
+              break;
+
+            ++DI;
+          } while (DI != DIEnd);
+          RewriteForwardClassDecl(DG);
+          continue;
+        }
+        else {
+          // Keep track of all interface declarations seen.
+          ObjCInterfacesSeen.push_back(IFace);
+          ++DI;
+          continue;
+        }
+      }
+
+      if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>((*DI))) {
+        if (!Proto->isThisDeclarationADefinition()) {
+          SmallVector<Decl *, 8> DG;
+          SourceLocation StartLoc = Proto->getBeginLoc();
+          do {
+            if (isa<ObjCProtocolDecl>(*DI) &&
+                !cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
+                StartLoc == (*DI)->getBeginLoc())
+              DG.push_back(*DI);
+            else
+              break;
+
+            ++DI;
+          } while (DI != DIEnd);
+          RewriteForwardProtocolDecl(DG);
+          continue;
+        }
+      }
+
+      HandleTopLevelSingleDecl(*DI);
+      ++DI;
+    }
+  }
+  // If we have a decl in the main file, see if we should rewrite it.
+  if (SM->isWrittenInMainFile(Loc))
+    return HandleDeclInMainFile(D);
+}
+
+//===----------------------------------------------------------------------===//
+// Syntactic (non-AST) Rewriting Code
+//===----------------------------------------------------------------------===//
+
+void RewriteModernObjC::RewriteInclude() {
+  SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
+  StringRef MainBuf = SM->getBufferData(MainFileID);
+  const char *MainBufStart = MainBuf.begin();
+  const char *MainBufEnd = MainBuf.end();
+  size_t ImportLen = strlen("import");
+
+  // Loop over the whole file, looking for includes.
+  for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
+    if (*BufPtr == '#') {
+      if (++BufPtr == MainBufEnd)
+        return;
+      while (*BufPtr == ' ' || *BufPtr == '\t')
+        if (++BufPtr == MainBufEnd)
+          return;
+      if (!strncmp(BufPtr, "import", ImportLen)) {
+        // replace import with include
+        SourceLocation ImportLoc =
+          LocStart.getLocWithOffset(BufPtr-MainBufStart);
+        ReplaceText(ImportLoc, ImportLen, "include");
+        BufPtr += ImportLen;
+      }
+    }
+  }
+}
+
+static void WriteInternalIvarName(const ObjCInterfaceDecl *IDecl,
+                                  ObjCIvarDecl *IvarDecl, std::string &Result) {
+  Result += "OBJC_IVAR_$_";
+  Result += IDecl->getName();
+  Result += "$";
+  Result += IvarDecl->getName();
+}
+
+std::string
+RewriteModernObjC::getIvarAccessString(ObjCIvarDecl *D) {
+  const ObjCInterfaceDecl *ClassDecl = D->getContainingInterface();
+
+  // Build name of symbol holding ivar offset.
+  std::string IvarOffsetName;
+  if (D->isBitField())
+    ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
+  else
+    WriteInternalIvarName(ClassDecl, D, IvarOffsetName);
+
+  std::string S = "(*(";
+  QualType IvarT = D->getType();
+  if (D->isBitField())
+    IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
+
+  if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
+    RecordDecl *RD = IvarT->castAs<RecordType>()->getDecl();
+    RD = RD->getDefinition();
+    if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
+      // decltype(((Foo_IMPL*)0)->bar) *
+      auto *CDecl = cast<ObjCContainerDecl>(D->getDeclContext());
+      // ivar in class extensions requires special treatment.
+      if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
+        CDecl = CatDecl->getClassInterface();
+      std::string RecName = std::string(CDecl->getName());
+      RecName += "_IMPL";
+      RecordDecl *RD =
+          RecordDecl::Create(*Context, TTK_Struct, TUDecl, SourceLocation(),
+                             SourceLocation(), &Context->Idents.get(RecName));
+      QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
+      unsigned UnsignedIntSize =
+      static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
+      Expr *Zero = IntegerLiteral::Create(*Context,
+                                          llvm::APInt(UnsignedIntSize, 0),
+                                          Context->UnsignedIntTy, SourceLocation());
+      Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
+      ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                              Zero);
+      FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                        SourceLocation(),
+                                        &Context->Idents.get(D->getNameAsString()),
+                                        IvarT, nullptr,
+                                        /*BitWidth=*/nullptr, /*Mutable=*/true,
+                                        ICIS_NoInit);
+      MemberExpr *ME = MemberExpr::CreateImplicit(
+          *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
+      IvarT = Context->getDecltypeType(ME, ME->getType());
+    }
+  }
+  convertObjCTypeToCStyleType(IvarT);
+  QualType castT = Context->getPointerType(IvarT);
+  std::string TypeString(castT.getAsString(Context->getPrintingPolicy()));
+  S += TypeString;
+  S += ")";
+
+  // ((char *)self + IVAR_OFFSET_SYMBOL_NAME)
+  S += "((char *)self + ";
+  S += IvarOffsetName;
+  S += "))";
+  if (D->isBitField()) {
+    S += ".";
+    S += D->getNameAsString();
+  }
+  ReferencedIvars[const_cast<ObjCInterfaceDecl *>(ClassDecl)].insert(D);
+  return S;
+}
+
+/// mustSynthesizeSetterGetterMethod - returns true if setter or getter has not
+/// been found in the class implementation. In this case, it must be synthesized.
+static bool mustSynthesizeSetterGetterMethod(ObjCImplementationDecl *IMP,
+                                             ObjCPropertyDecl *PD,
+                                             bool getter) {
+  auto *OMD = IMP->getInstanceMethod(getter ? PD->getGetterName()
+                                            : PD->getSetterName());
+  return !OMD || OMD->isSynthesizedAccessorStub();
+}
+
+void RewriteModernObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
+                                          ObjCImplementationDecl *IMD,
+                                          ObjCCategoryImplDecl *CID) {
+  static bool objcGetPropertyDefined = false;
+  static bool objcSetPropertyDefined = false;
+  SourceLocation startGetterSetterLoc;
+
+  if (PID->getBeginLoc().isValid()) {
+    SourceLocation startLoc = PID->getBeginLoc();
+    InsertText(startLoc, "// ");
+    const char *startBuf = SM->getCharacterData(startLoc);
+    assert((*startBuf == '@') && "bogus @synthesize location");
+    const char *semiBuf = strchr(startBuf, ';');
+    assert((*semiBuf == ';') && "@synthesize: can't find ';'");
+    startGetterSetterLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
+  } else
+    startGetterSetterLoc = IMD ? IMD->getEndLoc() : CID->getEndLoc();
+
+  if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+    return; // FIXME: is this correct?
+
+  // Generate the 'getter' function.
+  ObjCPropertyDecl *PD = PID->getPropertyDecl();
+  ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
+  assert(IMD && OID && "Synthesized ivars must be attached to @implementation");
+
+  unsigned Attributes = PD->getPropertyAttributes();
+  if (mustSynthesizeSetterGetterMethod(IMD, PD, true /*getter*/)) {
+    bool GenGetProperty =
+        !(Attributes & ObjCPropertyAttribute::kind_nonatomic) &&
+        (Attributes & (ObjCPropertyAttribute::kind_retain |
+                       ObjCPropertyAttribute::kind_copy));
+    std::string Getr;
+    if (GenGetProperty && !objcGetPropertyDefined) {
+      objcGetPropertyDefined = true;
+      // FIXME. Is this attribute correct in all cases?
+      Getr = "\nextern \"C\" __declspec(dllimport) "
+            "id objc_getProperty(id, SEL, long, bool);\n";
+    }
+    RewriteObjCMethodDecl(OID->getContainingInterface(),
+                          PID->getGetterMethodDecl(), Getr);
+    Getr += "{ ";
+    // Synthesize an explicit cast to gain access to the ivar.
+    // See objc-act.c:objc_synthesize_new_getter() for details.
+    if (GenGetProperty) {
+      // return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
+      Getr += "typedef ";
+      const FunctionType *FPRetType = nullptr;
+      RewriteTypeIntoString(PID->getGetterMethodDecl()->getReturnType(), Getr,
+                            FPRetType);
+      Getr += " _TYPE";
+      if (FPRetType) {
+        Getr += ")"; // close the precedence "scope" for "*".
+
+        // Now, emit the argument types (if any).
+        if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
+          Getr += "(";
+          for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
+            if (i) Getr += ", ";
+            std::string ParamStr =
+                FT->getParamType(i).getAsString(Context->getPrintingPolicy());
+            Getr += ParamStr;
+          }
+          if (FT->isVariadic()) {
+            if (FT->getNumParams())
+              Getr += ", ";
+            Getr += "...";
+          }
+          Getr += ")";
+        } else
+          Getr += "()";
+      }
+      Getr += ";\n";
+      Getr += "return (_TYPE)";
+      Getr += "objc_getProperty(self, _cmd, ";
+      RewriteIvarOffsetComputation(OID, Getr);
+      Getr += ", 1)";
+    }
+    else
+      Getr += "return " + getIvarAccessString(OID);
+    Getr += "; }";
+    InsertText(startGetterSetterLoc, Getr);
+  }
+
+  if (PD->isReadOnly() ||
+      !mustSynthesizeSetterGetterMethod(IMD, PD, false /*setter*/))
+    return;
+
+  // Generate the 'setter' function.
+  std::string Setr;
+  bool GenSetProperty = Attributes & (ObjCPropertyAttribute::kind_retain |
+                                      ObjCPropertyAttribute::kind_copy);
+  if (GenSetProperty && !objcSetPropertyDefined) {
+    objcSetPropertyDefined = true;
+    // FIXME. Is this attribute correct in all cases?
+    Setr = "\nextern \"C\" __declspec(dllimport) "
+    "void objc_setProperty (id, SEL, long, id, bool, bool);\n";
+  }
+
+  RewriteObjCMethodDecl(OID->getContainingInterface(),
+                        PID->getSetterMethodDecl(), Setr);
+  Setr += "{ ";
+  // Synthesize an explicit cast to initialize the ivar.
+  // See objc-act.c:objc_synthesize_new_setter() for details.
+  if (GenSetProperty) {
+    Setr += "objc_setProperty (self, _cmd, ";
+    RewriteIvarOffsetComputation(OID, Setr);
+    Setr += ", (id)";
+    Setr += PD->getName();
+    Setr += ", ";
+    if (Attributes & ObjCPropertyAttribute::kind_nonatomic)
+      Setr += "0, ";
+    else
+      Setr += "1, ";
+    if (Attributes & ObjCPropertyAttribute::kind_copy)
+      Setr += "1)";
+    else
+      Setr += "0)";
+  }
+  else {
+    Setr += getIvarAccessString(OID) + " = ";
+    Setr += PD->getName();
+  }
+  Setr += "; }\n";
+  InsertText(startGetterSetterLoc, Setr);
+}
+
+static void RewriteOneForwardClassDecl(ObjCInterfaceDecl *ForwardDecl,
+                                       std::string &typedefString) {
+  typedefString += "\n#ifndef _REWRITER_typedef_";
+  typedefString += ForwardDecl->getNameAsString();
+  typedefString += "\n";
+  typedefString += "#define _REWRITER_typedef_";
+  typedefString += ForwardDecl->getNameAsString();
+  typedefString += "\n";
+  typedefString += "typedef struct objc_object ";
+  typedefString += ForwardDecl->getNameAsString();
+  // typedef struct { } _objc_exc_Classname;
+  typedefString += ";\ntypedef struct {} _objc_exc_";
+  typedefString += ForwardDecl->getNameAsString();
+  typedefString += ";\n#endif\n";
+}
+
+void RewriteModernObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
+                                              const std::string &typedefString) {
+  SourceLocation startLoc = ClassDecl->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+  const char *semiPtr = strchr(startBuf, ';');
+  // Replace the @class with typedefs corresponding to the classes.
+  ReplaceText(startLoc, semiPtr-startBuf+1, typedefString);
+}
+
+void RewriteModernObjC::RewriteForwardClassDecl(DeclGroupRef D) {
+  std::string typedefString;
+  for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
+    if (ObjCInterfaceDecl *ForwardDecl = dyn_cast<ObjCInterfaceDecl>(*I)) {
+      if (I == D.begin()) {
+        // Translate to typedef's that forward reference structs with the same name
+        // as the class. As a convenience, we include the original declaration
+        // as a comment.
+        typedefString += "// @class ";
+        typedefString += ForwardDecl->getNameAsString();
+        typedefString += ";";
+      }
+      RewriteOneForwardClassDecl(ForwardDecl, typedefString);
+    }
+    else
+      HandleTopLevelSingleDecl(*I);
+  }
+  DeclGroupRef::iterator I = D.begin();
+  RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(*I), typedefString);
+}
+
+void RewriteModernObjC::RewriteForwardClassDecl(
+                                const SmallVectorImpl<Decl *> &D) {
+  std::string typedefString;
+  for (unsigned i = 0; i < D.size(); i++) {
+    ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(D[i]);
+    if (i == 0) {
+      typedefString += "// @class ";
+      typedefString += ForwardDecl->getNameAsString();
+      typedefString += ";";
+    }
+    RewriteOneForwardClassDecl(ForwardDecl, typedefString);
+  }
+  RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(D[0]), typedefString);
+}
+
+void RewriteModernObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
+  // When method is a synthesized one, such as a getter/setter there is
+  // nothing to rewrite.
+  if (Method->isImplicit())
+    return;
+  SourceLocation LocStart = Method->getBeginLoc();
+  SourceLocation LocEnd = Method->getEndLoc();
+
+  if (SM->getExpansionLineNumber(LocEnd) >
+      SM->getExpansionLineNumber(LocStart)) {
+    InsertText(LocStart, "#if 0\n");
+    ReplaceText(LocEnd, 1, ";\n#endif\n");
+  } else {
+    InsertText(LocStart, "// ");
+  }
+}
+
+void RewriteModernObjC::RewriteProperty(ObjCPropertyDecl *prop) {
+  SourceLocation Loc = prop->getAtLoc();
+
+  ReplaceText(Loc, 0, "// ");
+  // FIXME: handle properties that are declared across multiple lines.
+}
+
+void RewriteModernObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
+  SourceLocation LocStart = CatDecl->getBeginLoc();
+
+  // FIXME: handle category headers that are declared across multiple lines.
+  if (CatDecl->getIvarRBraceLoc().isValid()) {
+    ReplaceText(LocStart, 1, "/** ");
+    ReplaceText(CatDecl->getIvarRBraceLoc(), 1, "**/ ");
+  }
+  else {
+    ReplaceText(LocStart, 0, "// ");
+  }
+
+  for (auto *I : CatDecl->instance_properties())
+    RewriteProperty(I);
+
+  for (auto *I : CatDecl->instance_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : CatDecl->class_methods())
+    RewriteMethodDeclaration(I);
+
+  // Lastly, comment out the @end.
+  ReplaceText(CatDecl->getAtEndRange().getBegin(),
+              strlen("@end"), "/* @end */\n");
+}
+
+void RewriteModernObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
+  SourceLocation LocStart = PDecl->getBeginLoc();
+  assert(PDecl->isThisDeclarationADefinition());
+
+  // FIXME: handle protocol headers that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+
+  for (auto *I : PDecl->instance_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : PDecl->class_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : PDecl->instance_properties())
+    RewriteProperty(I);
+
+  // Lastly, comment out the @end.
+  SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
+  ReplaceText(LocEnd, strlen("@end"), "/* @end */\n");
+
+  // Must comment out @optional/@required
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+  for (const char *p = startBuf; p < endBuf; p++) {
+    if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
+      SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
+      ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
+
+    }
+    else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
+      SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
+      ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
+
+    }
+  }
+}
+
+void RewriteModernObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
+  SourceLocation LocStart = (*D.begin())->getBeginLoc();
+  if (LocStart.isInvalid())
+    llvm_unreachable("Invalid SourceLocation");
+  // FIXME: handle forward protocol that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+}
+
+void
+RewriteModernObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
+  SourceLocation LocStart = DG[0]->getBeginLoc();
+  if (LocStart.isInvalid())
+    llvm_unreachable("Invalid SourceLocation");
+  // FIXME: handle forward protocol that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+}
+
+void RewriteModernObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
+                                        const FunctionType *&FPRetType) {
+  if (T->isObjCQualifiedIdType())
+    ResultStr += "id";
+  else if (T->isFunctionPointerType() ||
+           T->isBlockPointerType()) {
+    // needs special handling, since pointer-to-functions have special
+    // syntax (where a decaration models use).
+    QualType retType = T;
+    QualType PointeeTy;
+    if (const PointerType* PT = retType->getAs<PointerType>())
+      PointeeTy = PT->getPointeeType();
+    else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
+      PointeeTy = BPT->getPointeeType();
+    if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
+      ResultStr +=
+          FPRetType->getReturnType().getAsString(Context->getPrintingPolicy());
+      ResultStr += "(*";
+    }
+  } else
+    ResultStr += T.getAsString(Context->getPrintingPolicy());
+}
+
+void RewriteModernObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
+                                        ObjCMethodDecl *OMD,
+                                        std::string &ResultStr) {
+  //fprintf(stderr,"In RewriteObjCMethodDecl\n");
+  const FunctionType *FPRetType = nullptr;
+  ResultStr += "\nstatic ";
+  RewriteTypeIntoString(OMD->getReturnType(), ResultStr, FPRetType);
+  ResultStr += " ";
+
+  // Unique method name
+  std::string NameStr;
+
+  if (OMD->isInstanceMethod())
+    NameStr += "_I_";
+  else
+    NameStr += "_C_";
+
+  NameStr += IDecl->getNameAsString();
+  NameStr += "_";
+
+  if (ObjCCategoryImplDecl *CID =
+      dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
+    NameStr += CID->getNameAsString();
+    NameStr += "_";
+  }
+  // Append selector names, replacing ':' with '_'
+  {
+    std::string selString = OMD->getSelector().getAsString();
+    int len = selString.size();
+    for (int i = 0; i < len; i++)
+      if (selString[i] == ':')
+        selString[i] = '_';
+    NameStr += selString;
+  }
+  // Remember this name for metadata emission
+  MethodInternalNames[OMD] = NameStr;
+  ResultStr += NameStr;
+
+  // Rewrite arguments
+  ResultStr += "(";
+
+  // invisible arguments
+  if (OMD->isInstanceMethod()) {
+    QualType selfTy = Context->getObjCInterfaceType(IDecl);
+    selfTy = Context->getPointerType(selfTy);
+    if (!LangOpts.MicrosoftExt) {
+      if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
+        ResultStr += "struct ";
+    }
+    // When rewriting for Microsoft, explicitly omit the structure name.
+    ResultStr += IDecl->getNameAsString();
+    ResultStr += " *";
+  }
+  else
+    ResultStr += Context->getObjCClassType().getAsString(
+      Context->getPrintingPolicy());
+
+  ResultStr += " self, ";
+  ResultStr += Context->getObjCSelType().getAsString(Context->getPrintingPolicy());
+  ResultStr += " _cmd";
+
+  // Method arguments.
+  for (const auto *PDecl : OMD->parameters()) {
+    ResultStr += ", ";
+    if (PDecl->getType()->isObjCQualifiedIdType()) {
+      ResultStr += "id ";
+      ResultStr += PDecl->getNameAsString();
+    } else {
+      std::string Name = PDecl->getNameAsString();
+      QualType QT = PDecl->getType();
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(QT);
+      QT.getAsStringInternal(Name, Context->getPrintingPolicy());
+      ResultStr += Name;
+    }
+  }
+  if (OMD->isVariadic())
+    ResultStr += ", ...";
+  ResultStr += ") ";
+
+  if (FPRetType) {
+    ResultStr += ")"; // close the precedence "scope" for "*".
+
+    // Now, emit the argument types (if any).
+    if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
+      ResultStr += "(";
+      for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
+        if (i) ResultStr += ", ";
+        std::string ParamStr =
+            FT->getParamType(i).getAsString(Context->getPrintingPolicy());
+        ResultStr += ParamStr;
+      }
+      if (FT->isVariadic()) {
+        if (FT->getNumParams())
+          ResultStr += ", ";
+        ResultStr += "...";
+      }
+      ResultStr += ")";
+    } else {
+      ResultStr += "()";
+    }
+  }
+}
+
+void RewriteModernObjC::RewriteImplementationDecl(Decl *OID) {
+  ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
+  ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
+  assert((IMD || CID) && "Unknown implementation type");
+
+  if (IMD) {
+    if (IMD->getIvarRBraceLoc().isValid()) {
+      ReplaceText(IMD->getBeginLoc(), 1, "/** ");
+      ReplaceText(IMD->getIvarRBraceLoc(), 1, "**/ ");
+    }
+    else {
+      InsertText(IMD->getBeginLoc(), "// ");
+    }
+  }
+  else
+    InsertText(CID->getBeginLoc(), "// ");
+
+  for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
+    if (!OMD->getBody())
+      continue;
+    std::string ResultStr;
+    RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
+    SourceLocation LocStart = OMD->getBeginLoc();
+    SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
+
+    const char *startBuf = SM->getCharacterData(LocStart);
+    const char *endBuf = SM->getCharacterData(LocEnd);
+    ReplaceText(LocStart, endBuf-startBuf, ResultStr);
+  }
+
+  for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
+    if (!OMD->getBody())
+      continue;
+    std::string ResultStr;
+    RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
+    SourceLocation LocStart = OMD->getBeginLoc();
+    SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
+
+    const char *startBuf = SM->getCharacterData(LocStart);
+    const char *endBuf = SM->getCharacterData(LocEnd);
+    ReplaceText(LocStart, endBuf-startBuf, ResultStr);
+  }
+  for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
+    RewritePropertyImplDecl(I, IMD, CID);
+
+  InsertText(IMD ? IMD->getEndLoc() : CID->getEndLoc(), "// ");
+}
+
+void RewriteModernObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
+  // Do not synthesize more than once.
+  if (ObjCSynthesizedStructs.count(ClassDecl))
+    return;
+  // Make sure super class's are written before current class is written.
+  ObjCInterfaceDecl *SuperClass = ClassDecl->getSuperClass();
+  while (SuperClass) {
+    RewriteInterfaceDecl(SuperClass);
+    SuperClass = SuperClass->getSuperClass();
+  }
+  std::string ResultStr;
+  if (!ObjCWrittenInterfaces.count(ClassDecl->getCanonicalDecl())) {
+    // we haven't seen a forward decl - generate a typedef.
+    RewriteOneForwardClassDecl(ClassDecl, ResultStr);
+    RewriteIvarOffsetSymbols(ClassDecl, ResultStr);
+
+    RewriteObjCInternalStruct(ClassDecl, ResultStr);
+    // Mark this typedef as having been written into its c++ equivalent.
+    ObjCWrittenInterfaces.insert(ClassDecl->getCanonicalDecl());
+
+    for (auto *I : ClassDecl->instance_properties())
+      RewriteProperty(I);
+    for (auto *I : ClassDecl->instance_methods())
+      RewriteMethodDeclaration(I);
+    for (auto *I : ClassDecl->class_methods())
+      RewriteMethodDeclaration(I);
+
+    // Lastly, comment out the @end.
+    ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
+                "/* @end */\n");
+  }
+}
+
+Stmt *RewriteModernObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
+  SourceRange OldRange = PseudoOp->getSourceRange();
+
+  // We just magically know some things about the structure of this
+  // expression.
+  ObjCMessageExpr *OldMsg =
+    cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
+                            PseudoOp->getNumSemanticExprs() - 1));
+
+  // Because the rewriter doesn't allow us to rewrite rewritten code,
+  // we need to suppress rewriting the sub-statements.
+  Expr *Base;
+  SmallVector<Expr*, 2> Args;
+  {
+    DisableReplaceStmtScope S(*this);
+
+    // Rebuild the base expression if we have one.
+    Base = nullptr;
+    if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
+      Base = OldMsg->getInstanceReceiver();
+      Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
+      Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
+    }
+
+    unsigned numArgs = OldMsg->getNumArgs();
+    for (unsigned i = 0; i < numArgs; i++) {
+      Expr *Arg = OldMsg->getArg(i);
+      if (isa<OpaqueValueExpr>(Arg))
+        Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
+      Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
+      Args.push_back(Arg);
+    }
+  }
+
+  // TODO: avoid this copy.
+  SmallVector<SourceLocation, 1> SelLocs;
+  OldMsg->getSelectorLocs(SelLocs);
+
+  ObjCMessageExpr *NewMsg = nullptr;
+  switch (OldMsg->getReceiverKind()) {
+  case ObjCMessageExpr::Class:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getClassReceiverTypeInfo(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::Instance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     Base,
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::SuperClass:
+  case ObjCMessageExpr::SuperInstance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getSuperLoc(),
+                 OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
+                                     OldMsg->getSuperType(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+  }
+
+  Stmt *Replacement = SynthMessageExpr(NewMsg);
+  ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
+  return Replacement;
+}
+
+Stmt *RewriteModernObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
+  SourceRange OldRange = PseudoOp->getSourceRange();
+
+  // We just magically know some things about the structure of this
+  // expression.
+  ObjCMessageExpr *OldMsg =
+    cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
+
+  // Because the rewriter doesn't allow us to rewrite rewritten code,
+  // we need to suppress rewriting the sub-statements.
+  Expr *Base = nullptr;
+  SmallVector<Expr*, 1> Args;
+  {
+    DisableReplaceStmtScope S(*this);
+    // Rebuild the base expression if we have one.
+    if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
+      Base = OldMsg->getInstanceReceiver();
+      Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
+      Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
+    }
+    unsigned numArgs = OldMsg->getNumArgs();
+    for (unsigned i = 0; i < numArgs; i++) {
+      Expr *Arg = OldMsg->getArg(i);
+      if (isa<OpaqueValueExpr>(Arg))
+        Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
+      Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
+      Args.push_back(Arg);
+    }
+  }
+
+  // Intentionally empty.
+  SmallVector<SourceLocation, 1> SelLocs;
+
+  ObjCMessageExpr *NewMsg = nullptr;
+  switch (OldMsg->getReceiverKind()) {
+  case ObjCMessageExpr::Class:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getClassReceiverTypeInfo(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::Instance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     Base,
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::SuperClass:
+  case ObjCMessageExpr::SuperInstance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getSuperLoc(),
+                 OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
+                                     OldMsg->getSuperType(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+  }
+
+  Stmt *Replacement = SynthMessageExpr(NewMsg);
+  ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
+  return Replacement;
+}
+
+/// SynthCountByEnumWithState - To print:
+/// ((NSUInteger (*)
+///  (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
+///  (void *)objc_msgSend)((id)l_collection,
+///                        sel_registerName(
+///                          "countByEnumeratingWithState:objects:count:"),
+///                        &enumState,
+///                        (id *)__rw_items, (NSUInteger)16)
+///
+void RewriteModernObjC::SynthCountByEnumWithState(std::string &buf) {
+  buf += "((_WIN_NSUInteger (*) (id, SEL, struct __objcFastEnumerationState *, "
+  "id *, _WIN_NSUInteger))(void *)objc_msgSend)";
+  buf += "\n\t\t";
+  buf += "((id)l_collection,\n\t\t";
+  buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
+  buf += "\n\t\t";
+  buf += "&enumState, "
+         "(id *)__rw_items, (_WIN_NSUInteger)16)";
+}
+
+/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
+/// statement to exit to its outer synthesized loop.
+///
+Stmt *RewriteModernObjC::RewriteBreakStmt(BreakStmt *S) {
+  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
+    return S;
+  // replace break with goto __break_label
+  std::string buf;
+
+  SourceLocation startLoc = S->getBeginLoc();
+  buf = "goto __break_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  ReplaceText(startLoc, strlen("break"), buf);
+
+  return nullptr;
+}
+
+void RewriteModernObjC::ConvertSourceLocationToLineDirective(
+                                          SourceLocation Loc,
+                                          std::string &LineString) {
+  if (Loc.isFileID() && GenerateLineInfo) {
+    LineString += "\n#line ";
+    PresumedLoc PLoc = SM->getPresumedLoc(Loc);
+    LineString += utostr(PLoc.getLine());
+    LineString += " \"";
+    LineString += Lexer::Stringify(PLoc.getFilename());
+    LineString += "\"\n";
+  }
+}
+
+/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
+/// statement to continue with its inner synthesized loop.
+///
+Stmt *RewriteModernObjC::RewriteContinueStmt(ContinueStmt *S) {
+  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
+    return S;
+  // replace continue with goto __continue_label
+  std::string buf;
+
+  SourceLocation startLoc = S->getBeginLoc();
+  buf = "goto __continue_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  ReplaceText(startLoc, strlen("continue"), buf);
+
+  return nullptr;
+}
+
+/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
+///  It rewrites:
+/// for ( type elem in collection) { stmts; }
+
+/// Into:
+/// {
+///   type elem;
+///   struct __objcFastEnumerationState enumState = { 0 };
+///   id __rw_items[16];
+///   id l_collection = (id)collection;
+///   NSUInteger limit = [l_collection countByEnumeratingWithState:&enumState
+///                                       objects:__rw_items count:16];
+/// if (limit) {
+///   unsigned long startMutations = *enumState.mutationsPtr;
+///   do {
+///        unsigned long counter = 0;
+///        do {
+///             if (startMutations != *enumState.mutationsPtr)
+///               objc_enumerationMutation(l_collection);
+///             elem = (type)enumState.itemsPtr[counter++];
+///             stmts;
+///             __continue_label: ;
+///        } while (counter < limit);
+///   } while ((limit = [l_collection countByEnumeratingWithState:&enumState
+///                                  objects:__rw_items count:16]));
+///   elem = nil;
+///   __break_label: ;
+///  }
+///  else
+///       elem = nil;
+///  }
+///
+Stmt *RewriteModernObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
+                                                SourceLocation OrigEnd) {
+  assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
+  assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
+         "ObjCForCollectionStmt Statement stack mismatch");
+  assert(!ObjCBcLabelNo.empty() &&
+         "ObjCForCollectionStmt - Label No stack empty");
+
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+  StringRef elementName;
+  std::string elementTypeAsString;
+  std::string buf;
+  // line directive first.
+  SourceLocation ForEachLoc = S->getForLoc();
+  ConvertSourceLocationToLineDirective(ForEachLoc, buf);
+  buf += "{\n\t";
+  if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
+    // type elem;
+    NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
+    QualType ElementType = cast<ValueDecl>(D)->getType();
+    if (ElementType->isObjCQualifiedIdType() ||
+        ElementType->isObjCQualifiedInterfaceType())
+      // Simply use 'id' for all qualified types.
+      elementTypeAsString = "id";
+    else
+      elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
+    buf += elementTypeAsString;
+    buf += " ";
+    elementName = D->getName();
+    buf += elementName;
+    buf += ";\n\t";
+  }
+  else {
+    DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
+    elementName = DR->getDecl()->getName();
+    ValueDecl *VD = DR->getDecl();
+    if (VD->getType()->isObjCQualifiedIdType() ||
+        VD->getType()->isObjCQualifiedInterfaceType())
+      // Simply use 'id' for all qualified types.
+      elementTypeAsString = "id";
+    else
+      elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
+  }
+
+  // struct __objcFastEnumerationState enumState = { 0 };
+  buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
+  // id __rw_items[16];
+  buf += "id __rw_items[16];\n\t";
+  // id l_collection = (id)
+  buf += "id l_collection = (id)";
+  // Find start location of 'collection' the hard way!
+  const char *startCollectionBuf = startBuf;
+  startCollectionBuf += 3;  // skip 'for'
+  startCollectionBuf = strchr(startCollectionBuf, '(');
+  startCollectionBuf++; // skip '('
+  // find 'in' and skip it.
+  while (*startCollectionBuf != ' ' ||
+         *(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
+         (*(startCollectionBuf+3) != ' ' &&
+          *(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
+    startCollectionBuf++;
+  startCollectionBuf += 3;
+
+  // Replace: "for (type element in" with string constructed thus far.
+  ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
+  // Replace ')' in for '(' type elem in collection ')' with ';'
+  SourceLocation rightParenLoc = S->getRParenLoc();
+  const char *rparenBuf = SM->getCharacterData(rightParenLoc);
+  SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
+  buf = ";\n\t";
+
+  // unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
+  //                                   objects:__rw_items count:16];
+  // which is synthesized into:
+  // NSUInteger limit =
+  // ((NSUInteger (*)
+  //  (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
+  //  (void *)objc_msgSend)((id)l_collection,
+  //                        sel_registerName(
+  //                          "countByEnumeratingWithState:objects:count:"),
+  //                        (struct __objcFastEnumerationState *)&state,
+  //                        (id *)__rw_items, (NSUInteger)16);
+  buf += "_WIN_NSUInteger limit =\n\t\t";
+  SynthCountByEnumWithState(buf);
+  buf += ";\n\t";
+  /// if (limit) {
+  ///   unsigned long startMutations = *enumState.mutationsPtr;
+  ///   do {
+  ///        unsigned long counter = 0;
+  ///        do {
+  ///             if (startMutations != *enumState.mutationsPtr)
+  ///               objc_enumerationMutation(l_collection);
+  ///             elem = (type)enumState.itemsPtr[counter++];
+  buf += "if (limit) {\n\t";
+  buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
+  buf += "do {\n\t\t";
+  buf += "unsigned long counter = 0;\n\t\t";
+  buf += "do {\n\t\t\t";
+  buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
+  buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
+  buf += elementName;
+  buf += " = (";
+  buf += elementTypeAsString;
+  buf += ")enumState.itemsPtr[counter++];";
+  // Replace ')' in for '(' type elem in collection ')' with all of these.
+  ReplaceText(lparenLoc, 1, buf);
+
+  ///            __continue_label: ;
+  ///        } while (counter < limit);
+  ///   } while ((limit = [l_collection countByEnumeratingWithState:&enumState
+  ///                                  objects:__rw_items count:16]));
+  ///   elem = nil;
+  ///   __break_label: ;
+  ///  }
+  ///  else
+  ///       elem = nil;
+  ///  }
+  ///
+  buf = ";\n\t";
+  buf += "__continue_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  buf += ": ;";
+  buf += "\n\t\t";
+  buf += "} while (counter < limit);\n\t";
+  buf += "} while ((limit = ";
+  SynthCountByEnumWithState(buf);
+  buf += "));\n\t";
+  buf += elementName;
+  buf += " = ((";
+  buf += elementTypeAsString;
+  buf += ")0);\n\t";
+  buf += "__break_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  buf += ": ;\n\t";
+  buf += "}\n\t";
+  buf += "else\n\t\t";
+  buf += elementName;
+  buf += " = ((";
+  buf += elementTypeAsString;
+  buf += ")0);\n\t";
+  buf += "}\n";
+
+  // Insert all these *after* the statement body.
+  // FIXME: If this should support Obj-C++, support CXXTryStmt
+  if (isa<CompoundStmt>(S->getBody())) {
+    SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
+    InsertText(endBodyLoc, buf);
+  } else {
+    /* Need to treat single statements specially. For example:
+     *
+     *     for (A *a in b) if (stuff()) break;
+     *     for (A *a in b) xxxyy;
+     *
+     * The following code simply scans ahead to the semi to find the actual end.
+     */
+    const char *stmtBuf = SM->getCharacterData(OrigEnd);
+    const char *semiBuf = strchr(stmtBuf, ';');
+    assert(semiBuf && "Can't find ';'");
+    SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
+    InsertText(endBodyLoc, buf);
+  }
+  Stmts.pop_back();
+  ObjCBcLabelNo.pop_back();
+  return nullptr;
+}
+
+static void Write_RethrowObject(std::string &buf) {
+  buf += "{ struct _FIN { _FIN(id reth) : rethrow(reth) {}\n";
+  buf += "\t~_FIN() { if (rethrow) objc_exception_throw(rethrow); }\n";
+  buf += "\tid rethrow;\n";
+  buf += "\t} _fin_force_rethow(_rethrow);";
+}
+
+/// RewriteObjCSynchronizedStmt -
+/// This routine rewrites @synchronized(expr) stmt;
+/// into:
+/// objc_sync_enter(expr);
+/// @try stmt @finally { objc_sync_exit(expr); }
+///
+Stmt *RewriteModernObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @synchronized location");
+
+  std::string buf;
+  SourceLocation SynchLoc = S->getAtSynchronizedLoc();
+  ConvertSourceLocationToLineDirective(SynchLoc, buf);
+  buf += "{ id _rethrow = 0; id _sync_obj = (id)";
+
+  const char *lparenBuf = startBuf;
+  while (*lparenBuf != '(') lparenBuf++;
+  ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
+
+  buf = "; objc_sync_enter(_sync_obj);\n";
+  buf += "try {\n\tstruct _SYNC_EXIT { _SYNC_EXIT(id arg) : sync_exit(arg) {}";
+  buf += "\n\t~_SYNC_EXIT() {objc_sync_exit(sync_exit);}";
+  buf += "\n\tid sync_exit;";
+  buf += "\n\t} _sync_exit(_sync_obj);\n";
+
+  // We can't use S->getSynchExpr()->getEndLoc() to find the end location, since
+  // the sync expression is typically a message expression that's already
+  // been rewritten! (which implies the SourceLocation's are invalid).
+  SourceLocation RParenExprLoc = S->getSynchBody()->getBeginLoc();
+  const char *RParenExprLocBuf = SM->getCharacterData(RParenExprLoc);
+  while (*RParenExprLocBuf != ')') RParenExprLocBuf--;
+  RParenExprLoc = startLoc.getLocWithOffset(RParenExprLocBuf-startBuf);
+
+  SourceLocation LBranceLoc = S->getSynchBody()->getBeginLoc();
+  const char *LBraceLocBuf = SM->getCharacterData(LBranceLoc);
+  assert (*LBraceLocBuf == '{');
+  ReplaceText(RParenExprLoc, (LBraceLocBuf - SM->getCharacterData(RParenExprLoc) + 1), buf);
+
+  SourceLocation startRBraceLoc = S->getSynchBody()->getEndLoc();
+  assert((*SM->getCharacterData(startRBraceLoc) == '}') &&
+         "bogus @synchronized block");
+
+  buf = "} catch (id e) {_rethrow = e;}\n";
+  Write_RethrowObject(buf);
+  buf += "}\n";
+  buf += "}\n";
+
+  ReplaceText(startRBraceLoc, 1, buf);
+
+  return nullptr;
+}
+
+void RewriteModernObjC::WarnAboutReturnGotoStmts(Stmt *S)
+{
+  // Perform a bottom up traversal of all children.
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt)
+      WarnAboutReturnGotoStmts(SubStmt);
+
+  if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
+    Diags.Report(Context->getFullLoc(S->getBeginLoc()),
+                 TryFinallyContainsReturnDiag);
+  }
+}
+
+Stmt *RewriteModernObjC::RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt  *S) {
+  SourceLocation startLoc = S->getAtLoc();
+  ReplaceText(startLoc, strlen("@autoreleasepool"), "/* @autoreleasepool */");
+  ReplaceText(S->getSubStmt()->getBeginLoc(), 1,
+              "{ __AtAutoreleasePool __autoreleasepool; ");
+
+  return nullptr;
+}
+
+Stmt *RewriteModernObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
+  ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt();
+  bool noCatch = S->getNumCatchStmts() == 0;
+  std::string buf;
+  SourceLocation TryLocation = S->getAtTryLoc();
+  ConvertSourceLocationToLineDirective(TryLocation, buf);
+
+  if (finalStmt) {
+    if (noCatch)
+      buf += "{ id volatile _rethrow = 0;\n";
+    else {
+      buf += "{ id volatile _rethrow = 0;\ntry {\n";
+    }
+  }
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @try location");
+  if (finalStmt)
+    ReplaceText(startLoc, 1, buf);
+  else
+    // @try -> try
+    ReplaceText(startLoc, 1, "");
+
+  for (ObjCAtCatchStmt *Catch : S->catch_stmts()) {
+    VarDecl *catchDecl = Catch->getCatchParamDecl();
+
+    startLoc = Catch->getBeginLoc();
+    bool AtRemoved = false;
+    if (catchDecl) {
+      QualType t = catchDecl->getType();
+      if (const ObjCObjectPointerType *Ptr =
+              t->getAs<ObjCObjectPointerType>()) {
+        // Should be a pointer to a class.
+        ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
+        if (IDecl) {
+          std::string Result;
+          ConvertSourceLocationToLineDirective(Catch->getBeginLoc(), Result);
+
+          startBuf = SM->getCharacterData(startLoc);
+          assert((*startBuf == '@') && "bogus @catch location");
+          SourceLocation rParenLoc = Catch->getRParenLoc();
+          const char *rParenBuf = SM->getCharacterData(rParenLoc);
+
+          // _objc_exc_Foo *_e as argument to catch.
+          Result += "catch (_objc_exc_"; Result += IDecl->getNameAsString();
+          Result += " *_"; Result += catchDecl->getNameAsString();
+          Result += ")";
+          ReplaceText(startLoc, rParenBuf-startBuf+1, Result);
+          // Foo *e = (Foo *)_e;
+          Result.clear();
+          Result = "{ ";
+          Result += IDecl->getNameAsString();
+          Result += " *"; Result += catchDecl->getNameAsString();
+          Result += " = ("; Result += IDecl->getNameAsString(); Result += "*)";
+          Result += "_"; Result += catchDecl->getNameAsString();
+
+          Result += "; ";
+          SourceLocation lBraceLoc = Catch->getCatchBody()->getBeginLoc();
+          ReplaceText(lBraceLoc, 1, Result);
+          AtRemoved = true;
+        }
+      }
+    }
+    if (!AtRemoved)
+      // @catch -> catch
+      ReplaceText(startLoc, 1, "");
+
+  }
+  if (finalStmt) {
+    buf.clear();
+    SourceLocation FinallyLoc = finalStmt->getBeginLoc();
+
+    if (noCatch) {
+      ConvertSourceLocationToLineDirective(FinallyLoc, buf);
+      buf += "catch (id e) {_rethrow = e;}\n";
+    }
+    else {
+      buf += "}\n";
+      ConvertSourceLocationToLineDirective(FinallyLoc, buf);
+      buf += "catch (id e) {_rethrow = e;}\n";
+    }
+
+    SourceLocation startFinalLoc = finalStmt->getBeginLoc();
+    ReplaceText(startFinalLoc, 8, buf);
+    Stmt *body = finalStmt->getFinallyBody();
+    SourceLocation startFinalBodyLoc = body->getBeginLoc();
+    buf.clear();
+    Write_RethrowObject(buf);
+    ReplaceText(startFinalBodyLoc, 1, buf);
+
+    SourceLocation endFinalBodyLoc = body->getEndLoc();
+    ReplaceText(endFinalBodyLoc, 1, "}\n}");
+    // Now check for any return/continue/go statements within the @try.
+    WarnAboutReturnGotoStmts(S->getTryBody());
+  }
+
+  return nullptr;
+}
+
+// This can't be done with ReplaceStmt(S, ThrowExpr), since
+// the throw expression is typically a message expression that's already
+// been rewritten! (which implies the SourceLocation's are invalid).
+Stmt *RewriteModernObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @throw location");
+
+  std::string buf;
+  /* void objc_exception_throw(id) __attribute__((noreturn)); */
+  if (S->getThrowExpr())
+    buf = "objc_exception_throw(";
+  else
+    buf = "throw";
+
+  // handle "@  throw" correctly.
+  const char *wBuf = strchr(startBuf, 'w');
+  assert((*wBuf == 'w') && "@throw: can't find 'w'");
+  ReplaceText(startLoc, wBuf-startBuf+1, buf);
+
+  SourceLocation endLoc = S->getEndLoc();
+  const char *endBuf = SM->getCharacterData(endLoc);
+  const char *semiBuf = strchr(endBuf, ';');
+  assert((*semiBuf == ';') && "@throw: can't find ';'");
+  SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
+  if (S->getThrowExpr())
+    ReplaceText(semiLoc, 1, ");");
+  return nullptr;
+}
+
+Stmt *RewriteModernObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
+  // Create a new string expression.
+  std::string StrEncoding;
+  Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
+  Expr *Replacement = getStringLiteral(StrEncoding);
+  ReplaceStmt(Exp, Replacement);
+
+  // Replace this subexpr in the parent.
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return Replacement;
+}
+
+Stmt *RewriteModernObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
+  // Create a call to sel_registerName("selName").
+  SmallVector<Expr*, 8> SelExprs;
+  SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs);
+  ReplaceStmt(Exp, SelExp);
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return SelExp;
+}
+
+CallExpr *
+RewriteModernObjC::SynthesizeCallToFunctionDecl(FunctionDecl *FD,
+                                                ArrayRef<Expr *> Args,
+                                                SourceLocation StartLoc,
+                                                SourceLocation EndLoc) {
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = FD->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(*Context, FD, false, msgSendType,
+                                               VK_LValue, SourceLocation());
+
+  // Now, we cast the reference to a pointer to the objc_msgSend type.
+  QualType pToFunc = Context->getPointerType(msgSendType);
+  ImplicitCastExpr *ICE =
+      ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
+                               DRE, nullptr, VK_PRValue, FPOptionsOverride());
+
+  const auto *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *Exp =
+      CallExpr::Create(*Context, ICE, Args, FT->getCallResultType(*Context),
+                       VK_PRValue, EndLoc, FPOptionsOverride());
+  return Exp;
+}
+
+static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
+                                const char *&startRef, const char *&endRef) {
+  while (startBuf < endBuf) {
+    if (*startBuf == '<')
+      startRef = startBuf; // mark the start.
+    if (*startBuf == '>') {
+      if (startRef && *startRef == '<') {
+        endRef = startBuf; // mark the end.
+        return true;
+      }
+      return false;
+    }
+    startBuf++;
+  }
+  return false;
+}
+
+static void scanToNextArgument(const char *&argRef) {
+  int angle = 0;
+  while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
+    if (*argRef == '<')
+      angle++;
+    else if (*argRef == '>')
+      angle--;
+    argRef++;
+  }
+  assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
+}
+
+bool RewriteModernObjC::needToScanForQualifiers(QualType T) {
+  if (T->isObjCQualifiedIdType())
+    return true;
+  if (const PointerType *PT = T->getAs<PointerType>()) {
+    if (PT->getPointeeType()->isObjCQualifiedIdType())
+      return true;
+  }
+  if (T->isObjCObjectPointerType()) {
+    T = T->getPointeeType();
+    return T->isObjCQualifiedInterfaceType();
+  }
+  if (T->isArrayType()) {
+    QualType ElemTy = Context->getBaseElementType(T);
+    return needToScanForQualifiers(ElemTy);
+  }
+  return false;
+}
+
+void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
+  QualType Type = E->getType();
+  if (needToScanForQualifiers(Type)) {
+    SourceLocation Loc, EndLoc;
+
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
+      Loc = ECE->getLParenLoc();
+      EndLoc = ECE->getRParenLoc();
+    } else {
+      Loc = E->getBeginLoc();
+      EndLoc = E->getEndLoc();
+    }
+    // This will defend against trying to rewrite synthesized expressions.
+    if (Loc.isInvalid() || EndLoc.isInvalid())
+      return;
+
+    const char *startBuf = SM->getCharacterData(Loc);
+    const char *endBuf = SM->getCharacterData(EndLoc);
+    const char *startRef = nullptr, *endRef = nullptr;
+    if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+      // Get the locations of the startRef, endRef.
+      SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
+      SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
+      // Comment out the protocol references.
+      InsertText(LessLoc, "/*");
+      InsertText(GreaterLoc, "*/");
+    }
+  }
+}
+
+void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
+  SourceLocation Loc;
+  QualType Type;
+  const FunctionProtoType *proto = nullptr;
+  if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
+    Loc = VD->getLocation();
+    Type = VD->getType();
+  }
+  else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
+    Loc = FD->getLocation();
+    // Check for ObjC 'id' and class types that have been adorned with protocol
+    // information (id<p>, C<p>*). The protocol references need to be rewritten!
+    const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
+    assert(funcType && "missing function type");
+    proto = dyn_cast<FunctionProtoType>(funcType);
+    if (!proto)
+      return;
+    Type = proto->getReturnType();
+  }
+  else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
+    Loc = FD->getLocation();
+    Type = FD->getType();
+  }
+  else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Dcl)) {
+    Loc = TD->getLocation();
+    Type = TD->getUnderlyingType();
+  }
+  else
+    return;
+
+  if (needToScanForQualifiers(Type)) {
+    // Since types are unique, we need to scan the buffer.
+
+    const char *endBuf = SM->getCharacterData(Loc);
+    const char *startBuf = endBuf;
+    while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
+      startBuf--; // scan backward (from the decl location) for return type.
+    const char *startRef = nullptr, *endRef = nullptr;
+    if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+      // Get the locations of the startRef, endRef.
+      SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
+      SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
+      // Comment out the protocol references.
+      InsertText(LessLoc, "/*");
+      InsertText(GreaterLoc, "*/");
+    }
+  }
+  if (!proto)
+      return; // most likely, was a variable
+  // Now check arguments.
+  const char *startBuf = SM->getCharacterData(Loc);
+  const char *startFuncBuf = startBuf;
+  for (unsigned i = 0; i < proto->getNumParams(); i++) {
+    if (needToScanForQualifiers(proto->getParamType(i))) {
+      // Since types are unique, we need to scan the buffer.
+
+      const char *endBuf = startBuf;
+      // scan forward (from the decl location) for argument types.
+      scanToNextArgument(endBuf);
+      const char *startRef = nullptr, *endRef = nullptr;
+      if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+        // Get the locations of the startRef, endRef.
+        SourceLocation LessLoc =
+          Loc.getLocWithOffset(startRef-startFuncBuf);
+        SourceLocation GreaterLoc =
+          Loc.getLocWithOffset(endRef-startFuncBuf+1);
+        // Comment out the protocol references.
+        InsertText(LessLoc, "/*");
+        InsertText(GreaterLoc, "*/");
+      }
+      startBuf = ++endBuf;
+    }
+    else {
+      // If the function name is derived from a macro expansion, then the
+      // argument buffer will not follow the name. Need to speak with Chris.
+      while (*startBuf && *startBuf != ')' && *startBuf != ',')
+        startBuf++; // scan forward (from the decl location) for argument types.
+      startBuf++;
+    }
+  }
+}
+
+void RewriteModernObjC::RewriteTypeOfDecl(VarDecl *ND) {
+  QualType QT = ND->getType();
+  const Type* TypePtr = QT->getAs<Type>();
+  if (!isa<TypeOfExprType>(TypePtr))
+    return;
+  while (isa<TypeOfExprType>(TypePtr)) {
+    const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
+    QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
+    TypePtr = QT->getAs<Type>();
+  }
+  // FIXME. This will not work for multiple declarators; as in:
+  // __typeof__(a) b,c,d;
+  std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
+  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  if (ND->getInit()) {
+    std::string Name(ND->getNameAsString());
+    TypeAsString += " " + Name + " = ";
+    Expr *E = ND->getInit();
+    SourceLocation startLoc;
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
+      startLoc = ECE->getLParenLoc();
+    else
+      startLoc = E->getBeginLoc();
+    startLoc = SM->getExpansionLoc(startLoc);
+    const char *endBuf = SM->getCharacterData(startLoc);
+    ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
+  }
+  else {
+    SourceLocation X = ND->getEndLoc();
+    X = SM->getExpansionLoc(X);
+    const char *endBuf = SM->getCharacterData(X);
+    ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
+  }
+}
+
+// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
+void RewriteModernObjC::SynthSelGetUidFunctionDecl() {
+  IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getFuncType =
+    getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
+  SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                               SourceLocation(),
+                                               SourceLocation(),
+                                               SelGetUidIdent, getFuncType,
+                                               nullptr, SC_Extern);
+}
+
+void RewriteModernObjC::RewriteFunctionDecl(FunctionDecl *FD) {
+  // declared in <objc/objc.h>
+  if (FD->getIdentifier() &&
+      FD->getName() == "sel_registerName") {
+    SelGetUidFunctionDecl = FD;
+    return;
+  }
+  RewriteObjCQualifiedInterfaceTypes(FD);
+}
+
+void RewriteModernObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
+  std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
+  const char *argPtr = TypeString.c_str();
+  if (!strchr(argPtr, '^')) {
+    Str += TypeString;
+    return;
+  }
+  while (*argPtr) {
+    Str += (*argPtr == '^' ? '*' : *argPtr);
+    argPtr++;
+  }
+}
+
+// FIXME. Consolidate this routine with RewriteBlockPointerType.
+void RewriteModernObjC::RewriteBlockPointerTypeVariable(std::string& Str,
+                                                  ValueDecl *VD) {
+  QualType Type = VD->getType();
+  std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
+  const char *argPtr = TypeString.c_str();
+  int paren = 0;
+  while (*argPtr) {
+    switch (*argPtr) {
+      case '(':
+        Str += *argPtr;
+        paren++;
+        break;
+      case ')':
+        Str += *argPtr;
+        paren--;
+        break;
+      case '^':
+        Str += '*';
+        if (paren == 1)
+          Str += VD->getNameAsString();
+        break;
+      default:
+        Str += *argPtr;
+        break;
+    }
+    argPtr++;
+  }
+}
+
+void RewriteModernObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
+  SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
+  const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
+  const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
+  if (!proto)
+    return;
+  QualType Type = proto->getReturnType();
+  std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
+  FdStr += " ";
+  FdStr += FD->getName();
+  FdStr +=  "(";
+  unsigned numArgs = proto->getNumParams();
+  for (unsigned i = 0; i < numArgs; i++) {
+    QualType ArgType = proto->getParamType(i);
+  RewriteBlockPointerType(FdStr, ArgType);
+  if (i+1 < numArgs)
+    FdStr += ", ";
+  }
+  if (FD->isVariadic()) {
+    FdStr +=  (numArgs > 0) ? ", ...);\n" : "...);\n";
+  }
+  else
+    FdStr +=  ");\n";
+  InsertText(FunLocStart, FdStr);
+}
+
+// SynthSuperConstructorFunctionDecl - id __rw_objc_super(id obj, id super);
+void RewriteModernObjC::SynthSuperConstructorFunctionDecl() {
+  if (SuperConstructorFunctionDecl)
+    return;
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys);
+  SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                     SourceLocation(),
+                                                     SourceLocation(),
+                                                     msgSendIdent, msgSendType,
+                                                     nullptr, SC_Extern);
+}
+
+// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
+void RewriteModernObjC::SynthMsgSendFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                             SourceLocation(),
+                                             SourceLocation(),
+                                             msgSendIdent, msgSendType, nullptr,
+                                             SC_Extern);
+}
+
+// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(void);
+void RewriteModernObjC::SynthMsgSendSuperFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
+  SmallVector<QualType, 2> ArgTys;
+  ArgTys.push_back(Context->VoidTy);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  msgSendIdent, msgSendType,
+                                                  nullptr, SC_Extern);
+}
+
+// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
+void RewriteModernObjC::SynthMsgSendStretFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  msgSendIdent, msgSendType,
+                                                  nullptr, SC_Extern);
+}
+
+// SynthMsgSendSuperStretFunctionDecl -
+// id objc_msgSendSuper_stret(void);
+void RewriteModernObjC::SynthMsgSendSuperStretFunctionDecl() {
+  IdentifierInfo *msgSendIdent =
+    &Context->Idents.get("objc_msgSendSuper_stret");
+  SmallVector<QualType, 2> ArgTys;
+  ArgTys.push_back(Context->VoidTy);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                       SourceLocation(),
+                                                       SourceLocation(),
+                                                       msgSendIdent,
+                                                       msgSendType, nullptr,
+                                                       SC_Extern);
+}
+
+// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
+void RewriteModernObjC::SynthMsgSendFpretFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
+                                               ArgTys, /*variadic=*/true);
+  MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  msgSendIdent, msgSendType,
+                                                  nullptr, SC_Extern);
+}
+
+// SynthGetClassFunctionDecl - Class objc_getClass(const char *name);
+void RewriteModernObjC::SynthGetClassFunctionDecl() {
+  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
+                                                ArgTys);
+  GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                              SourceLocation(),
+                                              SourceLocation(),
+                                              getClassIdent, getClassType,
+                                              nullptr, SC_Extern);
+}
+
+// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
+void RewriteModernObjC::SynthGetSuperClassFunctionDecl() {
+  IdentifierInfo *getSuperClassIdent =
+    &Context->Idents.get("class_getSuperclass");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getObjCClassType());
+  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
+                                                ArgTys);
+  GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                   SourceLocation(),
+                                                   SourceLocation(),
+                                                   getSuperClassIdent,
+                                                   getClassType, nullptr,
+                                                   SC_Extern);
+}
+
+// SynthGetMetaClassFunctionDecl - Class objc_getMetaClass(const char *name);
+void RewriteModernObjC::SynthGetMetaClassFunctionDecl() {
+  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
+                                                ArgTys);
+  GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  getClassIdent, getClassType,
+                                                  nullptr, SC_Extern);
+}
+
+Stmt *RewriteModernObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
+  assert (Exp != nullptr && "Expected non-null ObjCStringLiteral");
+  QualType strType = getConstantStringStructType();
+
+  std::string S = "__NSConstantStringImpl_";
+
+  std::string tmpName = InFileName;
+  unsigned i;
+  for (i=0; i < tmpName.length(); i++) {
+    char c = tmpName.at(i);
+    // replace any non-alphanumeric characters with '_'.
+    if (!isAlphanumeric(c))
+      tmpName[i] = '_';
+  }
+  S += tmpName;
+  S += "_";
+  S += utostr(NumObjCStringLiterals++);
+
+  Preamble += "static __NSConstantStringImpl " + S;
+  Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
+  Preamble += "0x000007c8,"; // utf8_str
+  // The pretty printer for StringLiteral handles escape characters properly.
+  std::string prettyBufS;
+  llvm::raw_string_ostream prettyBuf(prettyBufS);
+  Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
+  Preamble += prettyBuf.str();
+  Preamble += ",";
+  Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
+
+  VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                   SourceLocation(), &Context->Idents.get(S),
+                                   strType, nullptr, SC_Static);
+  DeclRefExpr *DRE = new (Context)
+      DeclRefExpr(*Context, NewVD, false, strType, VK_LValue, SourceLocation());
+  Expr *Unop = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), DRE, UO_AddrOf,
+      Context->getPointerType(DRE->getType()), VK_PRValue, OK_Ordinary,
+      SourceLocation(), false, FPOptionsOverride());
+  // cast to NSConstantString *
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
+                                            CK_CPointerToObjCPointerCast, Unop);
+  ReplaceStmt(Exp, cast);
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return cast;
+}
+
+Stmt *RewriteModernObjC::RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp) {
+  unsigned IntSize =
+    static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+
+  Expr *FlagExp = IntegerLiteral::Create(*Context,
+                                         llvm::APInt(IntSize, Exp->getValue()),
+                                         Context->IntTy, Exp->getLocation());
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Context->ObjCBuiltinBoolTy,
+                                            CK_BitCast, FlagExp);
+  ParenExpr *PE = new (Context) ParenExpr(Exp->getLocation(), Exp->getExprLoc(),
+                                          cast);
+  ReplaceStmt(Exp, PE);
+  return PE;
+}
+
+Stmt *RewriteModernObjC::RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp) {
+  // synthesize declaration of helper functions needed in this routine.
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  // use objc_msgSend() for all.
+  if (!MsgSendFunctionDecl)
+    SynthMsgSendFunctionDecl();
+  if (!GetClassFunctionDecl)
+    SynthGetClassFunctionDecl();
+
+  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
+  SourceLocation StartLoc = Exp->getBeginLoc();
+  SourceLocation EndLoc = Exp->getEndLoc();
+
+  // Synthesize a call to objc_msgSend().
+  SmallVector<Expr*, 4> MsgExprs;
+  SmallVector<Expr*, 4> ClsExprs;
+
+  // Create a call to objc_getClass("<BoxingClass>"). It will be the 1st argument.
+  ObjCMethodDecl *BoxingMethod = Exp->getBoxingMethod();
+  ObjCInterfaceDecl *BoxingClass = BoxingMethod->getClassInterface();
+
+  IdentifierInfo *clsName = BoxingClass->getIdentifier();
+  ClsExprs.push_back(getStringLiteral(clsName->getName()));
+  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                               StartLoc, EndLoc);
+  MsgExprs.push_back(Cls);
+
+  // Create a call to sel_registerName("<BoxingMethod>:"), etc.
+  // it will be the 2nd argument.
+  SmallVector<Expr*, 4> SelExprs;
+  SelExprs.push_back(
+      getStringLiteral(BoxingMethod->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs, StartLoc, EndLoc);
+  MsgExprs.push_back(SelExp);
+
+  // User provided sub-expression is the 3rd, and last, argument.
+  Expr *subExpr  = Exp->getSubExpr();
+  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(subExpr)) {
+    QualType type = ICE->getType();
+    const Expr *SubExpr = ICE->IgnoreParenImpCasts();
+    CastKind CK = CK_BitCast;
+    if (SubExpr->getType()->isIntegralType(*Context) && type->isBooleanType())
+      CK = CK_IntegralToBoolean;
+    subExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, subExpr);
+  }
+  MsgExprs.push_back(subExpr);
+
+  SmallVector<QualType, 4> ArgTypes;
+  ArgTypes.push_back(Context->getObjCClassType());
+  ArgTypes.push_back(Context->getObjCSelType());
+  for (const auto PI : BoxingMethod->parameters())
+    ArgTypes.push_back(PI->getType());
+
+  QualType returnType = Exp->getType();
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = MsgSendFlavor->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
+
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(
+      Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
+
+  // Now do the "normal" pointer to function cast.
+  QualType castType =
+    getSimpleFunctionType(returnType, ArgTypes, BoxingMethod->isVariadic());
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                  cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
+
+  auto *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
+                                  VK_PRValue, EndLoc, FPOptionsOverride());
+  ReplaceStmt(Exp, CE);
+  return CE;
+}
+
+Stmt *RewriteModernObjC::RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp) {
+  // synthesize declaration of helper functions needed in this routine.
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  // use objc_msgSend() for all.
+  if (!MsgSendFunctionDecl)
+    SynthMsgSendFunctionDecl();
+  if (!GetClassFunctionDecl)
+    SynthGetClassFunctionDecl();
+
+  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
+  SourceLocation StartLoc = Exp->getBeginLoc();
+  SourceLocation EndLoc = Exp->getEndLoc();
+
+  // Build the expression: __NSContainer_literal(int, ...).arr
+  QualType IntQT = Context->IntTy;
+  QualType NSArrayFType =
+    getSimpleFunctionType(Context->VoidTy, IntQT, true);
+  std::string NSArrayFName("__NSContainer_literal");
+  FunctionDecl *NSArrayFD = SynthBlockInitFunctionDecl(NSArrayFName);
+  DeclRefExpr *NSArrayDRE = new (Context) DeclRefExpr(
+      *Context, NSArrayFD, false, NSArrayFType, VK_PRValue, SourceLocation());
+
+  SmallVector<Expr*, 16> InitExprs;
+  unsigned NumElements = Exp->getNumElements();
+  unsigned UnsignedIntSize =
+    static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
+  Expr *count = IntegerLiteral::Create(*Context,
+                                       llvm::APInt(UnsignedIntSize, NumElements),
+                                       Context->UnsignedIntTy, SourceLocation());
+  InitExprs.push_back(count);
+  for (unsigned i = 0; i < NumElements; i++)
+    InitExprs.push_back(Exp->getElement(i));
+  Expr *NSArrayCallExpr =
+      CallExpr::Create(*Context, NSArrayDRE, InitExprs, NSArrayFType, VK_LValue,
+                       SourceLocation(), FPOptionsOverride());
+
+  FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("arr"),
+                                    Context->getPointerType(Context->VoidPtrTy),
+                                    nullptr, /*BitWidth=*/nullptr,
+                                    /*Mutable=*/true, ICIS_NoInit);
+  MemberExpr *ArrayLiteralME =
+      MemberExpr::CreateImplicit(*Context, NSArrayCallExpr, false, ARRFD,
+                                 ARRFD->getType(), VK_LValue, OK_Ordinary);
+  QualType ConstIdT = Context->getObjCIdType().withConst();
+  CStyleCastExpr * ArrayLiteralObjects =
+    NoTypeInfoCStyleCastExpr(Context,
+                             Context->getPointerType(ConstIdT),
+                             CK_BitCast,
+                             ArrayLiteralME);
+
+  // Synthesize a call to objc_msgSend().
+  SmallVector<Expr*, 32> MsgExprs;
+  SmallVector<Expr*, 4> ClsExprs;
+  QualType expType = Exp->getType();
+
+  // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
+  ObjCInterfaceDecl *Class =
+    expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
+
+  IdentifierInfo *clsName = Class->getIdentifier();
+  ClsExprs.push_back(getStringLiteral(clsName->getName()));
+  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                               StartLoc, EndLoc);
+  MsgExprs.push_back(Cls);
+
+  // Create a call to sel_registerName("arrayWithObjects:count:").
+  // it will be the 2nd argument.
+  SmallVector<Expr*, 4> SelExprs;
+  ObjCMethodDecl *ArrayMethod = Exp->getArrayWithObjectsMethod();
+  SelExprs.push_back(
+      getStringLiteral(ArrayMethod->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs, StartLoc, EndLoc);
+  MsgExprs.push_back(SelExp);
+
+  // (const id [])objects
+  MsgExprs.push_back(ArrayLiteralObjects);
+
+  // (NSUInteger)cnt
+  Expr *cnt = IntegerLiteral::Create(*Context,
+                                     llvm::APInt(UnsignedIntSize, NumElements),
+                                     Context->UnsignedIntTy, SourceLocation());
+  MsgExprs.push_back(cnt);
+
+  SmallVector<QualType, 4> ArgTypes;
+  ArgTypes.push_back(Context->getObjCClassType());
+  ArgTypes.push_back(Context->getObjCSelType());
+  for (const auto *PI : ArrayMethod->parameters())
+    ArgTypes.push_back(PI->getType());
+
+  QualType returnType = Exp->getType();
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = MsgSendFlavor->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
+
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(
+      Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
+
+  // Now do the "normal" pointer to function cast.
+  QualType castType =
+  getSimpleFunctionType(returnType, ArgTypes, ArrayMethod->isVariadic());
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                  cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
+
+  const FunctionType *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
+                                  VK_PRValue, EndLoc, FPOptionsOverride());
+  ReplaceStmt(Exp, CE);
+  return CE;
+}
+
+Stmt *RewriteModernObjC::RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp) {
+  // synthesize declaration of helper functions needed in this routine.
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  // use objc_msgSend() for all.
+  if (!MsgSendFunctionDecl)
+    SynthMsgSendFunctionDecl();
+  if (!GetClassFunctionDecl)
+    SynthGetClassFunctionDecl();
+
+  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
+  SourceLocation StartLoc = Exp->getBeginLoc();
+  SourceLocation EndLoc = Exp->getEndLoc();
+
+  // Build the expression: __NSContainer_literal(int, ...).arr
+  QualType IntQT = Context->IntTy;
+  QualType NSDictFType =
+    getSimpleFunctionType(Context->VoidTy, IntQT, true);
+  std::string NSDictFName("__NSContainer_literal");
+  FunctionDecl *NSDictFD = SynthBlockInitFunctionDecl(NSDictFName);
+  DeclRefExpr *NSDictDRE = new (Context) DeclRefExpr(
+      *Context, NSDictFD, false, NSDictFType, VK_PRValue, SourceLocation());
+
+  SmallVector<Expr*, 16> KeyExprs;
+  SmallVector<Expr*, 16> ValueExprs;
+
+  unsigned NumElements = Exp->getNumElements();
+  unsigned UnsignedIntSize =
+    static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
+  Expr *count = IntegerLiteral::Create(*Context,
+                                       llvm::APInt(UnsignedIntSize, NumElements),
+                                       Context->UnsignedIntTy, SourceLocation());
+  KeyExprs.push_back(count);
+  ValueExprs.push_back(count);
+  for (unsigned i = 0; i < NumElements; i++) {
+    ObjCDictionaryElement Element = Exp->getKeyValueElement(i);
+    KeyExprs.push_back(Element.Key);
+    ValueExprs.push_back(Element.Value);
+  }
+
+  // (const id [])objects
+  Expr *NSValueCallExpr =
+      CallExpr::Create(*Context, NSDictDRE, ValueExprs, NSDictFType, VK_LValue,
+                       SourceLocation(), FPOptionsOverride());
+
+  FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                       SourceLocation(),
+                                       &Context->Idents.get("arr"),
+                                       Context->getPointerType(Context->VoidPtrTy),
+                                       nullptr, /*BitWidth=*/nullptr,
+                                       /*Mutable=*/true, ICIS_NoInit);
+  MemberExpr *DictLiteralValueME =
+      MemberExpr::CreateImplicit(*Context, NSValueCallExpr, false, ARRFD,
+                                 ARRFD->getType(), VK_LValue, OK_Ordinary);
+  QualType ConstIdT = Context->getObjCIdType().withConst();
+  CStyleCastExpr * DictValueObjects =
+    NoTypeInfoCStyleCastExpr(Context,
+                             Context->getPointerType(ConstIdT),
+                             CK_BitCast,
+                             DictLiteralValueME);
+  // (const id <NSCopying> [])keys
+  Expr *NSKeyCallExpr =
+      CallExpr::Create(*Context, NSDictDRE, KeyExprs, NSDictFType, VK_LValue,
+                       SourceLocation(), FPOptionsOverride());
+
+  MemberExpr *DictLiteralKeyME =
+      MemberExpr::CreateImplicit(*Context, NSKeyCallExpr, false, ARRFD,
+                                 ARRFD->getType(), VK_LValue, OK_Ordinary);
+
+  CStyleCastExpr * DictKeyObjects =
+    NoTypeInfoCStyleCastExpr(Context,
+                             Context->getPointerType(ConstIdT),
+                             CK_BitCast,
+                             DictLiteralKeyME);
+
+  // Synthesize a call to objc_msgSend().
+  SmallVector<Expr*, 32> MsgExprs;
+  SmallVector<Expr*, 4> ClsExprs;
+  QualType expType = Exp->getType();
+
+  // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
+  ObjCInterfaceDecl *Class =
+  expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
+
+  IdentifierInfo *clsName = Class->getIdentifier();
+  ClsExprs.push_back(getStringLiteral(clsName->getName()));
+  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                               StartLoc, EndLoc);
+  MsgExprs.push_back(Cls);
+
+  // Create a call to sel_registerName("arrayWithObjects:count:").
+  // it will be the 2nd argument.
+  SmallVector<Expr*, 4> SelExprs;
+  ObjCMethodDecl *DictMethod = Exp->getDictWithObjectsMethod();
+  SelExprs.push_back(getStringLiteral(DictMethod->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs, StartLoc, EndLoc);
+  MsgExprs.push_back(SelExp);
+
+  // (const id [])objects
+  MsgExprs.push_back(DictValueObjects);
+
+  // (const id <NSCopying> [])keys
+  MsgExprs.push_back(DictKeyObjects);
+
+  // (NSUInteger)cnt
+  Expr *cnt = IntegerLiteral::Create(*Context,
+                                     llvm::APInt(UnsignedIntSize, NumElements),
+                                     Context->UnsignedIntTy, SourceLocation());
+  MsgExprs.push_back(cnt);
+
+  SmallVector<QualType, 8> ArgTypes;
+  ArgTypes.push_back(Context->getObjCClassType());
+  ArgTypes.push_back(Context->getObjCSelType());
+  for (const auto *PI : DictMethod->parameters()) {
+    QualType T = PI->getType();
+    if (const PointerType* PT = T->getAs<PointerType>()) {
+      QualType PointeeTy = PT->getPointeeType();
+      convertToUnqualifiedObjCType(PointeeTy);
+      T = Context->getPointerType(PointeeTy);
+    }
+    ArgTypes.push_back(T);
+  }
+
+  QualType returnType = Exp->getType();
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = MsgSendFlavor->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
+
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(
+      Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
+
+  // Now do the "normal" pointer to function cast.
+  QualType castType =
+  getSimpleFunctionType(returnType, ArgTypes, DictMethod->isVariadic());
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                  cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
+
+  const FunctionType *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
+                                  VK_PRValue, EndLoc, FPOptionsOverride());
+  ReplaceStmt(Exp, CE);
+  return CE;
+}
+
+// struct __rw_objc_super {
+//   struct objc_object *object; struct objc_object *superClass;
+// };
+QualType RewriteModernObjC::getSuperStructType() {
+  if (!SuperStructDecl) {
+    SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                         SourceLocation(), SourceLocation(),
+                                         &Context->Idents.get("__rw_objc_super"));
+    QualType FieldTypes[2];
+
+    // struct objc_object *object;
+    FieldTypes[0] = Context->getObjCIdType();
+    // struct objc_object *superClass;
+    FieldTypes[1] = Context->getObjCIdType();
+
+    // Create fields
+    for (unsigned i = 0; i < 2; ++i) {
+      SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
+                                                 SourceLocation(),
+                                                 SourceLocation(), nullptr,
+                                                 FieldTypes[i], nullptr,
+                                                 /*BitWidth=*/nullptr,
+                                                 /*Mutable=*/false,
+                                                 ICIS_NoInit));
+    }
+
+    SuperStructDecl->completeDefinition();
+  }
+  return Context->getTagDeclType(SuperStructDecl);
+}
+
+QualType RewriteModernObjC::getConstantStringStructType() {
+  if (!ConstantStringDecl) {
+    ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                            SourceLocation(), SourceLocation(),
+                         &Context->Idents.get("__NSConstantStringImpl"));
+    QualType FieldTypes[4];
+
+    // struct objc_object *receiver;
+    FieldTypes[0] = Context->getObjCIdType();
+    // int flags;
+    FieldTypes[1] = Context->IntTy;
+    // char *str;
+    FieldTypes[2] = Context->getPointerType(Context->CharTy);
+    // long length;
+    FieldTypes[3] = Context->LongTy;
+
+    // Create fields
+    for (unsigned i = 0; i < 4; ++i) {
+      ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
+                                                    ConstantStringDecl,
+                                                    SourceLocation(),
+                                                    SourceLocation(), nullptr,
+                                                    FieldTypes[i], nullptr,
+                                                    /*BitWidth=*/nullptr,
+                                                    /*Mutable=*/true,
+                                                    ICIS_NoInit));
+    }
+
+    ConstantStringDecl->completeDefinition();
+  }
+  return Context->getTagDeclType(ConstantStringDecl);
+}
+
+/// getFunctionSourceLocation - returns start location of a function
+/// definition. Complication arises when function has declared as
+/// extern "C" or extern "C" {...}
+static SourceLocation getFunctionSourceLocation (RewriteModernObjC &R,
+                                                 FunctionDecl *FD) {
+  if (FD->isExternC()  && !FD->isMain()) {
+    const DeclContext *DC = FD->getDeclContext();
+    if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
+      // if it is extern "C" {...}, return function decl's own location.
+      if (!LSD->getRBraceLoc().isValid())
+        return LSD->getExternLoc();
+  }
+  if (FD->getStorageClass() != SC_None)
+    R.RewriteBlockLiteralFunctionDecl(FD);
+  return FD->getTypeSpecStartLoc();
+}
+
+void RewriteModernObjC::RewriteLineDirective(const Decl *D) {
+
+  SourceLocation Location = D->getLocation();
+
+  if (Location.isFileID() && GenerateLineInfo) {
+    std::string LineString("\n#line ");
+    PresumedLoc PLoc = SM->getPresumedLoc(Location);
+    LineString += utostr(PLoc.getLine());
+    LineString += " \"";
+    LineString += Lexer::Stringify(PLoc.getFilename());
+    if (isa<ObjCMethodDecl>(D))
+      LineString += "\"";
+    else LineString += "\"\n";
+
+    Location = D->getBeginLoc();
+    if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+      if (FD->isExternC()  && !FD->isMain()) {
+        const DeclContext *DC = FD->getDeclContext();
+        if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
+          // if it is extern "C" {...}, return function decl's own location.
+          if (!LSD->getRBraceLoc().isValid())
+            Location = LSD->getExternLoc();
+      }
+    }
+    InsertText(Location, LineString);
+  }
+}
+
+/// SynthMsgSendStretCallExpr - This routine translates message expression
+/// into a call to objc_msgSend_stret() entry point. Tricky part is that
+/// nil check on receiver must be performed before calling objc_msgSend_stret.
+/// MsgSendStretFlavor - function declaration objc_msgSend_stret(...)
+/// msgSendType - function type of objc_msgSend_stret(...)
+/// returnType - Result type of the method being synthesized.
+/// ArgTypes - type of the arguments passed to objc_msgSend_stret, starting with receiver type.
+/// MsgExprs - list of argument expressions being passed to objc_msgSend_stret,
+/// starting with receiver.
+/// Method - Method being rewritten.
+Expr *RewriteModernObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
+                                                 QualType returnType,
+                                                 SmallVectorImpl<QualType> &ArgTypes,
+                                                 SmallVectorImpl<Expr*> &MsgExprs,
+                                                 ObjCMethodDecl *Method) {
+  // Now do the "normal" pointer to function cast.
+  QualType FuncType = getSimpleFunctionType(
+      returnType, ArgTypes, Method ? Method->isVariadic() : false);
+  QualType castType = Context->getPointerType(FuncType);
+
+  // build type for containing the objc_msgSend_stret object.
+  static unsigned stretCount=0;
+  std::string name = "__Stret"; name += utostr(stretCount);
+  std::string str =
+    "extern \"C\" void * __cdecl memset(void *_Dst, int _Val, size_t _Size);\n";
+  str += "namespace {\n";
+  str += "struct "; str += name;
+  str += " {\n\t";
+  str += name;
+  str += "(id receiver, SEL sel";
+  for (unsigned i = 2; i < ArgTypes.size(); i++) {
+    std::string ArgName = "arg"; ArgName += utostr(i);
+    ArgTypes[i].getAsStringInternal(ArgName, Context->getPrintingPolicy());
+    str += ", "; str += ArgName;
+  }
+  // could be vararg.
+  for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
+    std::string ArgName = "arg"; ArgName += utostr(i);
+    MsgExprs[i]->getType().getAsStringInternal(ArgName,
+                                               Context->getPrintingPolicy());
+    str += ", "; str += ArgName;
+  }
+
+  str += ") {\n";
+  str += "\t  unsigned size = sizeof(";
+  str += returnType.getAsString(Context->getPrintingPolicy()); str += ");\n";
+
+  str += "\t  if (size == 1 || size == 2 || size == 4 || size == 8)\n";
+
+  str += "\t    s = (("; str += castType.getAsString(Context->getPrintingPolicy());
+  str += ")(void *)objc_msgSend)(receiver, sel";
+  for (unsigned i = 2; i < ArgTypes.size(); i++) {
+    str += ", arg"; str += utostr(i);
+  }
+  // could be vararg.
+  for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
+    str += ", arg"; str += utostr(i);
+  }
+  str+= ");\n";
+
+  str += "\t  else if (receiver == 0)\n";
+  str += "\t    memset((void*)&s, 0, sizeof(s));\n";
+  str += "\t  else\n";
+
+  str += "\t    s = (("; str += castType.getAsString(Context->getPrintingPolicy());
+  str += ")(void *)objc_msgSend_stret)(receiver, sel";
+  for (unsigned i = 2; i < ArgTypes.size(); i++) {
+    str += ", arg"; str += utostr(i);
+  }
+  // could be vararg.
+  for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
+    str += ", arg"; str += utostr(i);
+  }
+  str += ");\n";
+
+  str += "\t}\n";
+  str += "\t"; str += returnType.getAsString(Context->getPrintingPolicy());
+  str += " s;\n";
+  str += "};\n};\n\n";
+  SourceLocation FunLocStart;
+  if (CurFunctionDef)
+    FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
+  else {
+    assert(CurMethodDef && "SynthMsgSendStretCallExpr - CurMethodDef is null");
+    FunLocStart = CurMethodDef->getBeginLoc();
+  }
+
+  InsertText(FunLocStart, str);
+  ++stretCount;
+
+  // AST for __Stretn(receiver, args).s;
+  IdentifierInfo *ID = &Context->Idents.get(name);
+  FunctionDecl *FD =
+      FunctionDecl::Create(*Context, TUDecl, SourceLocation(), SourceLocation(),
+                           ID, FuncType, nullptr, SC_Extern, false, false);
+  DeclRefExpr *DRE = new (Context)
+      DeclRefExpr(*Context, FD, false, castType, VK_PRValue, SourceLocation());
+  CallExpr *STCE =
+      CallExpr::Create(*Context, DRE, MsgExprs, castType, VK_LValue,
+                       SourceLocation(), FPOptionsOverride());
+
+  FieldDecl *FieldD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("s"),
+                                    returnType, nullptr,
+                                    /*BitWidth=*/nullptr,
+                                    /*Mutable=*/true, ICIS_NoInit);
+  MemberExpr *ME = MemberExpr::CreateImplicit(
+      *Context, STCE, false, FieldD, FieldD->getType(), VK_LValue, OK_Ordinary);
+
+  return ME;
+}
+
+Stmt *RewriteModernObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
+                                    SourceLocation StartLoc,
+                                    SourceLocation EndLoc) {
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  if (!MsgSendFunctionDecl)
+    SynthMsgSendFunctionDecl();
+  if (!MsgSendSuperFunctionDecl)
+    SynthMsgSendSuperFunctionDecl();
+  if (!MsgSendStretFunctionDecl)
+    SynthMsgSendStretFunctionDecl();
+  if (!MsgSendSuperStretFunctionDecl)
+    SynthMsgSendSuperStretFunctionDecl();
+  if (!MsgSendFpretFunctionDecl)
+    SynthMsgSendFpretFunctionDecl();
+  if (!GetClassFunctionDecl)
+    SynthGetClassFunctionDecl();
+  if (!GetSuperClassFunctionDecl)
+    SynthGetSuperClassFunctionDecl();
+  if (!GetMetaClassFunctionDecl)
+    SynthGetMetaClassFunctionDecl();
+
+  // default to objc_msgSend().
+  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
+  // May need to use objc_msgSend_stret() as well.
+  FunctionDecl *MsgSendStretFlavor = nullptr;
+  if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
+    QualType resultType = mDecl->getReturnType();
+    if (resultType->isRecordType())
+      MsgSendStretFlavor = MsgSendStretFunctionDecl;
+    else if (resultType->isRealFloatingType())
+      MsgSendFlavor = MsgSendFpretFunctionDecl;
+  }
+
+  // Synthesize a call to objc_msgSend().
+  SmallVector<Expr*, 8> MsgExprs;
+  switch (Exp->getReceiverKind()) {
+  case ObjCMessageExpr::SuperClass: {
+    MsgSendFlavor = MsgSendSuperFunctionDecl;
+    if (MsgSendStretFlavor)
+      MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
+    assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
+
+    ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
+
+    SmallVector<Expr*, 4> InitExprs;
+
+    // set the receiver to self, the first argument to all methods.
+    InitExprs.push_back(NoTypeInfoCStyleCastExpr(
+        Context, Context->getObjCIdType(), CK_BitCast,
+        new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
+                                  Context->getObjCIdType(), VK_PRValue,
+                                  SourceLocation()))); // set the 'receiver'.
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    SmallVector<Expr*, 8> ClsExprs;
+    ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
+    // (Class)objc_getClass("CurrentClass")
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
+                                                 ClsExprs, StartLoc, EndLoc);
+    ClsExprs.clear();
+    ClsExprs.push_back(Cls);
+    Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
+                                       StartLoc, EndLoc);
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    // To turn off a warning, type-cast to 'id'
+    InitExprs.push_back( // set 'super class', using class_getSuperclass().
+                        NoTypeInfoCStyleCastExpr(Context,
+                                                 Context->getObjCIdType(),
+                                                 CK_BitCast, Cls));
+    // struct __rw_objc_super
+    QualType superType = getSuperStructType();
+    Expr *SuperRep;
+
+    if (LangOpts.MicrosoftExt) {
+      SynthSuperConstructorFunctionDecl();
+      // Simulate a constructor call...
+      DeclRefExpr *DRE = new (Context)
+          DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
+                      VK_LValue, SourceLocation());
+      SuperRep =
+          CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
+                           SourceLocation(), FPOptionsOverride());
+      // The code for super is a little tricky to prevent collision with
+      // the structure definition in the header. The rewriter has it's own
+      // internal definition (__rw_objc_super) that is uses. This is why
+      // we need the cast below. For example:
+      // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
+      //
+      SuperRep = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
+          Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
+          SourceLocation(), false, FPOptionsOverride());
+      SuperRep = NoTypeInfoCStyleCastExpr(Context,
+                                          Context->getPointerType(superType),
+                                          CK_BitCast, SuperRep);
+    } else {
+      // (struct __rw_objc_super) { <exprs from above> }
+      InitListExpr *ILE =
+        new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
+                                   SourceLocation());
+      TypeSourceInfo *superTInfo
+        = Context->getTrivialTypeSourceInfo(superType);
+      SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
+                                                   superType, VK_LValue,
+                                                   ILE, false);
+      // struct __rw_objc_super *
+      SuperRep = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
+          Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
+          SourceLocation(), false, FPOptionsOverride());
+    }
+    MsgExprs.push_back(SuperRep);
+    break;
+  }
+
+  case ObjCMessageExpr::Class: {
+    SmallVector<Expr*, 8> ClsExprs;
+    ObjCInterfaceDecl *Class
+      = Exp->getClassReceiver()->castAs<ObjCObjectType>()->getInterface();
+    IdentifierInfo *clsName = Class->getIdentifier();
+    ClsExprs.push_back(getStringLiteral(clsName->getName()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                                 StartLoc, EndLoc);
+    CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
+                                                 Context->getObjCIdType(),
+                                                 CK_BitCast, Cls);
+    MsgExprs.push_back(ArgExpr);
+    break;
+  }
+
+  case ObjCMessageExpr::SuperInstance:{
+    MsgSendFlavor = MsgSendSuperFunctionDecl;
+    if (MsgSendStretFlavor)
+      MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
+    assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
+    ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
+    SmallVector<Expr*, 4> InitExprs;
+
+    InitExprs.push_back(NoTypeInfoCStyleCastExpr(
+        Context, Context->getObjCIdType(), CK_BitCast,
+        new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
+                                  Context->getObjCIdType(), VK_PRValue,
+                                  SourceLocation()))); // set the 'receiver'.
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    SmallVector<Expr*, 8> ClsExprs;
+    ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
+    // (Class)objc_getClass("CurrentClass")
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                                 StartLoc, EndLoc);
+    ClsExprs.clear();
+    ClsExprs.push_back(Cls);
+    Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
+                                       StartLoc, EndLoc);
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    // To turn off a warning, type-cast to 'id'
+    InitExprs.push_back(
+      // set 'super class', using class_getSuperclass().
+      NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                               CK_BitCast, Cls));
+    // struct __rw_objc_super
+    QualType superType = getSuperStructType();
+    Expr *SuperRep;
+
+    if (LangOpts.MicrosoftExt) {
+      SynthSuperConstructorFunctionDecl();
+      // Simulate a constructor call...
+      DeclRefExpr *DRE = new (Context)
+          DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
+                      VK_LValue, SourceLocation());
+      SuperRep =
+          CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
+                           SourceLocation(), FPOptionsOverride());
+      // The code for super is a little tricky to prevent collision with
+      // the structure definition in the header. The rewriter has it's own
+      // internal definition (__rw_objc_super) that is uses. This is why
+      // we need the cast below. For example:
+      // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
+      //
+      SuperRep = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
+          Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
+          SourceLocation(), false, FPOptionsOverride());
+      SuperRep = NoTypeInfoCStyleCastExpr(Context,
+                               Context->getPointerType(superType),
+                               CK_BitCast, SuperRep);
+    } else {
+      // (struct __rw_objc_super) { <exprs from above> }
+      InitListExpr *ILE =
+        new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
+                                   SourceLocation());
+      TypeSourceInfo *superTInfo
+        = Context->getTrivialTypeSourceInfo(superType);
+      SuperRep = new (Context) CompoundLiteralExpr(
+          SourceLocation(), superTInfo, superType, VK_PRValue, ILE, false);
+    }
+    MsgExprs.push_back(SuperRep);
+    break;
+  }
+
+  case ObjCMessageExpr::Instance: {
+    // Remove all type-casts because it may contain objc-style types; e.g.
+    // Foo<Proto> *.
+    Expr *recExpr = Exp->getInstanceReceiver();
+    while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
+      recExpr = CE->getSubExpr();
+    CastKind CK = recExpr->getType()->isObjCObjectPointerType()
+                    ? CK_BitCast : recExpr->getType()->isBlockPointerType()
+                                     ? CK_BlockPointerToObjCPointerCast
+                                     : CK_CPointerToObjCPointerCast;
+
+    recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                       CK, recExpr);
+    MsgExprs.push_back(recExpr);
+    break;
+  }
+  }
+
+  // Create a call to sel_registerName("selName"), it will be the 2nd argument.
+  SmallVector<Expr*, 8> SelExprs;
+  SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs, StartLoc, EndLoc);
+  MsgExprs.push_back(SelExp);
+
+  // Now push any user supplied arguments.
+  for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
+    Expr *userExpr = Exp->getArg(i);
+    // Make all implicit casts explicit...ICE comes in handy:-)
+    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
+      // Reuse the ICE type, it is exactly what the doctor ordered.
+      QualType type = ICE->getType();
+      if (needToScanForQualifiers(type))
+        type = Context->getObjCIdType();
+      // Make sure we convert "type (^)(...)" to "type (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(type);
+      const Expr *SubExpr = ICE->IgnoreParenImpCasts();
+      CastKind CK;
+      if (SubExpr->getType()->isIntegralType(*Context) &&
+          type->isBooleanType()) {
+        CK = CK_IntegralToBoolean;
+      } else if (type->isObjCObjectPointerType()) {
+        if (SubExpr->getType()->isBlockPointerType()) {
+          CK = CK_BlockPointerToObjCPointerCast;
+        } else if (SubExpr->getType()->isPointerType()) {
+          CK = CK_CPointerToObjCPointerCast;
+        } else {
+          CK = CK_BitCast;
+        }
+      } else {
+        CK = CK_BitCast;
+      }
+
+      userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, userExpr);
+    }
+    // Make id<P...> cast into an 'id' cast.
+    else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
+      if (CE->getType()->isObjCQualifiedIdType()) {
+        while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
+          userExpr = CE->getSubExpr();
+        CastKind CK;
+        if (userExpr->getType()->isIntegralType(*Context)) {
+          CK = CK_IntegralToPointer;
+        } else if (userExpr->getType()->isBlockPointerType()) {
+          CK = CK_BlockPointerToObjCPointerCast;
+        } else if (userExpr->getType()->isPointerType()) {
+          CK = CK_CPointerToObjCPointerCast;
+        } else {
+          CK = CK_BitCast;
+        }
+        userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                            CK, userExpr);
+      }
+    }
+    MsgExprs.push_back(userExpr);
+    // We've transferred the ownership to MsgExprs. For now, we *don't* null
+    // out the argument in the original expression (since we aren't deleting
+    // the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
+    //Exp->setArg(i, 0);
+  }
+  // Generate the funky cast.
+  CastExpr *cast;
+  SmallVector<QualType, 8> ArgTypes;
+  QualType returnType;
+
+  // Push 'id' and 'SEL', the 2 implicit arguments.
+  if (MsgSendFlavor == MsgSendSuperFunctionDecl)
+    ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
+  else
+    ArgTypes.push_back(Context->getObjCIdType());
+  ArgTypes.push_back(Context->getObjCSelType());
+  if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
+    // Push any user argument types.
+    for (const auto *PI : OMD->parameters()) {
+      QualType t = PI->getType()->isObjCQualifiedIdType()
+                     ? Context->getObjCIdType()
+                     : PI->getType();
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(t);
+      ArgTypes.push_back(t);
+    }
+    returnType = Exp->getType();
+    convertToUnqualifiedObjCType(returnType);
+    (void)convertBlockPointerToFunctionPointer(returnType);
+  } else {
+    returnType = Context->getObjCIdType();
+  }
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = MsgSendFlavor->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
+
+  // Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
+  // If we don't do this cast, we get the following bizarre warning/note:
+  // xx.m:13: warning: function called through a non-compatible type
+  // xx.m:13: note: if this code is reached, the program will abort
+  cast = NoTypeInfoCStyleCastExpr(Context,
+                                  Context->getPointerType(Context->VoidTy),
+                                  CK_BitCast, DRE);
+
+  // Now do the "normal" pointer to function cast.
+  // If we don't have a method decl, force a variadic cast.
+  const ObjCMethodDecl *MD = Exp->getMethodDecl();
+  QualType castType =
+    getSimpleFunctionType(returnType, ArgTypes, MD ? MD->isVariadic() : true);
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                  cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
+
+  const FunctionType *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
+                                  VK_PRValue, EndLoc, FPOptionsOverride());
+  Stmt *ReplacingStmt = CE;
+  if (MsgSendStretFlavor) {
+    // We have the method which returns a struct/union. Must also generate
+    // call to objc_msgSend_stret and hang both varieties on a conditional
+    // expression which dictate which one to envoke depending on size of
+    // method's return type.
+
+    Expr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
+                                           returnType,
+                                           ArgTypes, MsgExprs,
+                                           Exp->getMethodDecl());
+    ReplacingStmt = STCE;
+  }
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return ReplacingStmt;
+}
+
+Stmt *RewriteModernObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
+  Stmt *ReplacingStmt =
+      SynthMessageExpr(Exp, Exp->getBeginLoc(), Exp->getEndLoc());
+
+  // Now do the actual rewrite.
+  ReplaceStmt(Exp, ReplacingStmt);
+
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return ReplacingStmt;
+}
+
+// typedef struct objc_object Protocol;
+QualType RewriteModernObjC::getProtocolType() {
+  if (!ProtocolTypeDecl) {
+    TypeSourceInfo *TInfo
+      = Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
+    ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
+                                           SourceLocation(), SourceLocation(),
+                                           &Context->Idents.get("Protocol"),
+                                           TInfo);
+  }
+  return Context->getTypeDeclType(ProtocolTypeDecl);
+}
+
+/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
+/// a synthesized/forward data reference (to the protocol's metadata).
+/// The forward references (and metadata) are generated in
+/// RewriteModernObjC::HandleTranslationUnit().
+Stmt *RewriteModernObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
+  std::string Name = "_OBJC_PROTOCOL_REFERENCE_$_" +
+                      Exp->getProtocol()->getNameAsString();
+  IdentifierInfo *ID = &Context->Idents.get(Name);
+  VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                SourceLocation(), ID, getProtocolType(),
+                                nullptr, SC_Extern);
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, VD, false, getProtocolType(), VK_LValue, SourceLocation());
+  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(
+      Context, Context->getPointerType(DRE->getType()), CK_BitCast, DRE);
+  ReplaceStmt(Exp, castExpr);
+  ProtocolExprDecls.insert(Exp->getProtocol()->getCanonicalDecl());
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return castExpr;
+}
+
+/// IsTagDefinedInsideClass - This routine checks that a named tagged type
+/// is defined inside an objective-c class. If so, it returns true.
+bool RewriteModernObjC::IsTagDefinedInsideClass(ObjCContainerDecl *IDecl,
+                                                TagDecl *Tag,
+                                                bool &IsNamedDefinition) {
+  if (!IDecl)
+    return false;
+  SourceLocation TagLocation;
+  if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) {
+    RD = RD->getDefinition();
+    if (!RD || !RD->getDeclName().getAsIdentifierInfo())
+      return false;
+    IsNamedDefinition = true;
+    TagLocation = RD->getLocation();
+    return Context->getSourceManager().isBeforeInTranslationUnit(
+                                          IDecl->getLocation(), TagLocation);
+  }
+  if (EnumDecl *ED = dyn_cast<EnumDecl>(Tag)) {
+    if (!ED || !ED->getDeclName().getAsIdentifierInfo())
+      return false;
+    IsNamedDefinition = true;
+    TagLocation = ED->getLocation();
+    return Context->getSourceManager().isBeforeInTranslationUnit(
+                                          IDecl->getLocation(), TagLocation);
+  }
+  return false;
+}
+
+/// RewriteObjCFieldDeclType - This routine rewrites a type into the buffer.
+/// It handles elaborated types, as well as enum types in the process.
+bool RewriteModernObjC::RewriteObjCFieldDeclType(QualType &Type,
+                                                 std::string &Result) {
+  if (isa<TypedefType>(Type)) {
+    Result += "\t";
+    return false;
+  }
+
+  if (Type->isArrayType()) {
+    QualType ElemTy = Context->getBaseElementType(Type);
+    return RewriteObjCFieldDeclType(ElemTy, Result);
+  }
+  else if (Type->isRecordType()) {
+    RecordDecl *RD = Type->castAs<RecordType>()->getDecl();
+    if (RD->isCompleteDefinition()) {
+      if (RD->isStruct())
+        Result += "\n\tstruct ";
+      else if (RD->isUnion())
+        Result += "\n\tunion ";
+      else
+        assert(false && "class not allowed as an ivar type");
+
+      Result += RD->getName();
+      if (GlobalDefinedTags.count(RD)) {
+        // struct/union is defined globally, use it.
+        Result += " ";
+        return true;
+      }
+      Result += " {\n";
+      for (auto *FD : RD->fields())
+        RewriteObjCFieldDecl(FD, Result);
+      Result += "\t} ";
+      return true;
+    }
+  }
+  else if (Type->isEnumeralType()) {
+    EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
+    if (ED->isCompleteDefinition()) {
+      Result += "\n\tenum ";
+      Result += ED->getName();
+      if (GlobalDefinedTags.count(ED)) {
+        // Enum is globall defined, use it.
+        Result += " ";
+        return true;
+      }
+
+      Result += " {\n";
+      for (const auto *EC : ED->enumerators()) {
+        Result += "\t"; Result += EC->getName(); Result += " = ";
+        Result += toString(EC->getInitVal(), 10);
+        Result += ",\n";
+      }
+      Result += "\t} ";
+      return true;
+    }
+  }
+
+  Result += "\t";
+  convertObjCTypeToCStyleType(Type);
+  return false;
+}
+
+
+/// RewriteObjCFieldDecl - This routine rewrites a field into the buffer.
+/// It handles elaborated types, as well as enum types in the process.
+void RewriteModernObjC::RewriteObjCFieldDecl(FieldDecl *fieldDecl,
+                                             std::string &Result) {
+  QualType Type = fieldDecl->getType();
+  std::string Name = fieldDecl->getNameAsString();
+
+  bool EleboratedType = RewriteObjCFieldDeclType(Type, Result);
+  if (!EleboratedType)
+    Type.getAsStringInternal(Name, Context->getPrintingPolicy());
+  Result += Name;
+  if (fieldDecl->isBitField()) {
+    Result += " : "; Result += utostr(fieldDecl->getBitWidthValue(*Context));
+  }
+  else if (EleboratedType && Type->isArrayType()) {
+    const ArrayType *AT = Context->getAsArrayType(Type);
+    do {
+      if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
+        Result += "[";
+        llvm::APInt Dim = CAT->getSize();
+        Result += utostr(Dim.getZExtValue());
+        Result += "]";
+      }
+      AT = Context->getAsArrayType(AT->getElementType());
+    } while (AT);
+  }
+
+  Result += ";\n";
+}
+
+/// RewriteLocallyDefinedNamedAggregates - This routine rewrites locally defined
+/// named aggregate types into the input buffer.
+void RewriteModernObjC::RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
+                                             std::string &Result) {
+  QualType Type = fieldDecl->getType();
+  if (isa<TypedefType>(Type))
+    return;
+  if (Type->isArrayType())
+    Type = Context->getBaseElementType(Type);
+
+  auto *IDecl = dyn_cast<ObjCContainerDecl>(fieldDecl->getDeclContext());
+
+  TagDecl *TD = nullptr;
+  if (Type->isRecordType()) {
+    TD = Type->castAs<RecordType>()->getDecl();
+  }
+  else if (Type->isEnumeralType()) {
+    TD = Type->castAs<EnumType>()->getDecl();
+  }
+
+  if (TD) {
+    if (GlobalDefinedTags.count(TD))
+      return;
+
+    bool IsNamedDefinition = false;
+    if (IsTagDefinedInsideClass(IDecl, TD, IsNamedDefinition)) {
+      RewriteObjCFieldDeclType(Type, Result);
+      Result += ";";
+    }
+    if (IsNamedDefinition)
+      GlobalDefinedTags.insert(TD);
+  }
+}
+
+unsigned RewriteModernObjC::ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV) {
+  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
+  if (ObjCInterefaceHasBitfieldGroups.count(CDecl)) {
+    return IvarGroupNumber[IV];
+  }
+  unsigned GroupNo = 0;
+  SmallVector<const ObjCIvarDecl *, 8> IVars;
+  for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
+       IVD; IVD = IVD->getNextIvar())
+    IVars.push_back(IVD);
+
+  for (unsigned i = 0, e = IVars.size(); i < e; i++)
+    if (IVars[i]->isBitField()) {
+      IvarGroupNumber[IVars[i++]] = ++GroupNo;
+      while (i < e && IVars[i]->isBitField())
+        IvarGroupNumber[IVars[i++]] = GroupNo;
+      if (i < e)
+        --i;
+    }
+
+  ObjCInterefaceHasBitfieldGroups.insert(CDecl);
+  return IvarGroupNumber[IV];
+}
+
+QualType RewriteModernObjC::SynthesizeBitfieldGroupStructType(
+                              ObjCIvarDecl *IV,
+                              SmallVectorImpl<ObjCIvarDecl *> &IVars) {
+  std::string StructTagName;
+  ObjCIvarBitfieldGroupType(IV, StructTagName);
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct,
+                                      Context->getTranslationUnitDecl(),
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get(StructTagName));
+  for (unsigned i=0, e = IVars.size(); i < e; i++) {
+    ObjCIvarDecl *Ivar = IVars[i];
+    RD->addDecl(FieldDecl::Create(*Context, RD, SourceLocation(), SourceLocation(),
+                                  &Context->Idents.get(Ivar->getName()),
+                                  Ivar->getType(),
+                                  nullptr, /*Expr *BW */Ivar->getBitWidth(),
+                                  false, ICIS_NoInit));
+  }
+  RD->completeDefinition();
+  return Context->getTagDeclType(RD);
+}
+
+QualType RewriteModernObjC::GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV) {
+  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
+  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
+  std::pair<const ObjCInterfaceDecl*, unsigned> tuple = std::make_pair(CDecl, GroupNo);
+  if (GroupRecordType.count(tuple))
+    return GroupRecordType[tuple];
+
+  SmallVector<ObjCIvarDecl *, 8> IVars;
+  for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
+       IVD; IVD = IVD->getNextIvar()) {
+    if (IVD->isBitField())
+      IVars.push_back(const_cast<ObjCIvarDecl *>(IVD));
+    else {
+      if (!IVars.empty()) {
+        unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
+        // Generate the struct type for this group of bitfield ivars.
+        GroupRecordType[std::make_pair(CDecl, GroupNo)] =
+          SynthesizeBitfieldGroupStructType(IVars[0], IVars);
+        IVars.clear();
+      }
+    }
+  }
+  if (!IVars.empty()) {
+    // Do the last one.
+    unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
+    GroupRecordType[std::make_pair(CDecl, GroupNo)] =
+      SynthesizeBitfieldGroupStructType(IVars[0], IVars);
+  }
+  QualType RetQT = GroupRecordType[tuple];
+  assert(!RetQT.isNull() && "GetGroupRecordTypeForObjCIvarBitfield struct type is NULL");
+
+  return RetQT;
+}
+
+/// ObjCIvarBitfieldGroupDecl - Names field decl. for ivar bitfield group.
+/// Name would be: classname__GRBF_n where n is the group number for this ivar.
+void RewriteModernObjC::ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV,
+                                                  std::string &Result) {
+  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
+  Result += CDecl->getName();
+  Result += "__GRBF_";
+  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
+  Result += utostr(GroupNo);
+}
+
+/// ObjCIvarBitfieldGroupType - Names struct type for ivar bitfield group.
+/// Name of the struct would be: classname__T_n where n is the group number for
+/// this ivar.
+void RewriteModernObjC::ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV,
+                                                  std::string &Result) {
+  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
+  Result += CDecl->getName();
+  Result += "__T_";
+  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
+  Result += utostr(GroupNo);
+}
+
+/// ObjCIvarBitfieldGroupOffset - Names symbol for ivar bitfield group field offset.
+/// Name would be: OBJC_IVAR_$_classname__GRBF_n where n is the group number for
+/// this ivar.
+void RewriteModernObjC::ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV,
+                                                    std::string &Result) {
+  Result += "OBJC_IVAR_$_";
+  ObjCIvarBitfieldGroupDecl(IV, Result);
+}
+
+#define SKIP_BITFIELDS(IX, ENDIX, VEC) { \
+      while ((IX < ENDIX) && VEC[IX]->isBitField()) \
+        ++IX; \
+      if (IX < ENDIX) \
+        --IX; \
+}
+
+/// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
+/// an objective-c class with ivars.
+void RewriteModernObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
+                                               std::string &Result) {
+  assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
+  assert(CDecl->getName() != "" &&
+         "Name missing in SynthesizeObjCInternalStruct");
+  ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
+  SmallVector<ObjCIvarDecl *, 8> IVars;
+  for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
+       IVD; IVD = IVD->getNextIvar())
+    IVars.push_back(IVD);
+
+  SourceLocation LocStart = CDecl->getBeginLoc();
+  SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
+
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+
+  // If no ivars and no root or if its root, directly or indirectly,
+  // have no ivars (thus not synthesized) then no need to synthesize this class.
+  if ((!CDecl->isThisDeclarationADefinition() || IVars.size() == 0) &&
+      (!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
+    endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
+    ReplaceText(LocStart, endBuf-startBuf, Result);
+    return;
+  }
+
+  // Insert named struct/union definitions inside class to
+  // outer scope. This follows semantics of locally defined
+  // struct/unions in objective-c classes.
+  for (unsigned i = 0, e = IVars.size(); i < e; i++)
+    RewriteLocallyDefinedNamedAggregates(IVars[i], Result);
+
+  // Insert named structs which are syntheized to group ivar bitfields
+  // to outer scope as well.
+  for (unsigned i = 0, e = IVars.size(); i < e; i++)
+    if (IVars[i]->isBitField()) {
+      ObjCIvarDecl *IV = IVars[i];
+      QualType QT = GetGroupRecordTypeForObjCIvarBitfield(IV);
+      RewriteObjCFieldDeclType(QT, Result);
+      Result += ";";
+      // skip over ivar bitfields in this group.
+      SKIP_BITFIELDS(i , e, IVars);
+    }
+
+  Result += "\nstruct ";
+  Result += CDecl->getNameAsString();
+  Result += "_IMPL {\n";
+
+  if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
+    Result += "\tstruct "; Result += RCDecl->getNameAsString();
+    Result += "_IMPL "; Result += RCDecl->getNameAsString();
+    Result += "_IVARS;\n";
+  }
+
+  for (unsigned i = 0, e = IVars.size(); i < e; i++) {
+    if (IVars[i]->isBitField()) {
+      ObjCIvarDecl *IV = IVars[i];
+      Result += "\tstruct ";
+      ObjCIvarBitfieldGroupType(IV, Result); Result += " ";
+      ObjCIvarBitfieldGroupDecl(IV, Result); Result += ";\n";
+      // skip over ivar bitfields in this group.
+      SKIP_BITFIELDS(i , e, IVars);
+    }
+    else
+      RewriteObjCFieldDecl(IVars[i], Result);
+  }
+
+  Result += "};\n";
+  endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
+  ReplaceText(LocStart, endBuf-startBuf, Result);
+  // Mark this struct as having been generated.
+  if (!ObjCSynthesizedStructs.insert(CDecl).second)
+    llvm_unreachable("struct already synthesize- RewriteObjCInternalStruct");
+}
+
+/// RewriteIvarOffsetSymbols - Rewrite ivar offset symbols of those ivars which
+/// have been referenced in an ivar access expression.
+void RewriteModernObjC::RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
+                                                  std::string &Result) {
+  // write out ivar offset symbols which have been referenced in an ivar
+  // access expression.
+  llvm::SmallSetVector<ObjCIvarDecl *, 8> Ivars = ReferencedIvars[CDecl];
+
+  if (Ivars.empty())
+    return;
+
+  llvm::DenseSet<std::pair<const ObjCInterfaceDecl*, unsigned> > GroupSymbolOutput;
+  for (ObjCIvarDecl *IvarDecl : Ivars) {
+    const ObjCInterfaceDecl *IDecl = IvarDecl->getContainingInterface();
+    unsigned GroupNo = 0;
+    if (IvarDecl->isBitField()) {
+      GroupNo = ObjCIvarBitfieldGroupNo(IvarDecl);
+      if (GroupSymbolOutput.count(std::make_pair(IDecl, GroupNo)))
+        continue;
+    }
+    Result += "\n";
+    if (LangOpts.MicrosoftExt)
+      Result += "__declspec(allocate(\".objc_ivar$B\")) ";
+    Result += "extern \"C\" ";
+    if (LangOpts.MicrosoftExt &&
+        IvarDecl->getAccessControl() != ObjCIvarDecl::Private &&
+        IvarDecl->getAccessControl() != ObjCIvarDecl::Package)
+        Result += "__declspec(dllimport) ";
+
+    Result += "unsigned long ";
+    if (IvarDecl->isBitField()) {
+      ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
+      GroupSymbolOutput.insert(std::make_pair(IDecl, GroupNo));
+    }
+    else
+      WriteInternalIvarName(CDecl, IvarDecl, Result);
+    Result += ";";
+  }
+}
+
+//===----------------------------------------------------------------------===//
+// Meta Data Emission
+//===----------------------------------------------------------------------===//
+
+/// RewriteImplementations - This routine rewrites all method implementations
+/// and emits meta-data.
+
+void RewriteModernObjC::RewriteImplementations() {
+  int ClsDefCount = ClassImplementation.size();
+  int CatDefCount = CategoryImplementation.size();
+
+  // Rewrite implemented methods
+  for (int i = 0; i < ClsDefCount; i++) {
+    ObjCImplementationDecl *OIMP = ClassImplementation[i];
+    ObjCInterfaceDecl *CDecl = OIMP->getClassInterface();
+    if (CDecl->isImplicitInterfaceDecl())
+      assert(false &&
+             "Legacy implicit interface rewriting not supported in moder abi");
+    RewriteImplementationDecl(OIMP);
+  }
+
+  for (int i = 0; i < CatDefCount; i++) {
+    ObjCCategoryImplDecl *CIMP = CategoryImplementation[i];
+    ObjCInterfaceDecl *CDecl = CIMP->getClassInterface();
+    if (CDecl->isImplicitInterfaceDecl())
+      assert(false &&
+             "Legacy implicit interface rewriting not supported in moder abi");
+    RewriteImplementationDecl(CIMP);
+  }
+}
+
+void RewriteModernObjC::RewriteByRefString(std::string &ResultStr,
+                                     const std::string &Name,
+                                     ValueDecl *VD, bool def) {
+  assert(BlockByRefDeclNo.count(VD) &&
+         "RewriteByRefString: ByRef decl missing");
+  if (def)
+    ResultStr += "struct ";
+  ResultStr += "__Block_byref_" + Name +
+    "_" + utostr(BlockByRefDeclNo[VD]) ;
+}
+
+static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
+  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
+    return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
+  return false;
+}
+
+std::string RewriteModernObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
+                                                   StringRef funcName,
+                                                   std::string Tag) {
+  const FunctionType *AFT = CE->getFunctionType();
+  QualType RT = AFT->getReturnType();
+  std::string StructRef = "struct " + Tag;
+  SourceLocation BlockLoc = CE->getExprLoc();
+  std::string S;
+  ConvertSourceLocationToLineDirective(BlockLoc, S);
+
+  S += "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
+         funcName.str() + "_block_func_" + utostr(i);
+
+  BlockDecl *BD = CE->getBlockDecl();
+
+  if (isa<FunctionNoProtoType>(AFT)) {
+    // No user-supplied arguments. Still need to pass in a pointer to the
+    // block (to reference imported block decl refs).
+    S += "(" + StructRef + " *__cself)";
+  } else if (BD->param_empty()) {
+    S += "(" + StructRef + " *__cself)";
+  } else {
+    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
+    assert(FT && "SynthesizeBlockFunc: No function proto");
+    S += '(';
+    // first add the implicit argument.
+    S += StructRef + " *__cself, ";
+    std::string ParamStr;
+    for (BlockDecl::param_iterator AI = BD->param_begin(),
+         E = BD->param_end(); AI != E; ++AI) {
+      if (AI != BD->param_begin()) S += ", ";
+      ParamStr = (*AI)->getNameAsString();
+      QualType QT = (*AI)->getType();
+      (void)convertBlockPointerToFunctionPointer(QT);
+      QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
+      S += ParamStr;
+    }
+    if (FT->isVariadic()) {
+      if (!BD->param_empty()) S += ", ";
+      S += "...";
+    }
+    S += ')';
+  }
+  S += " {\n";
+
+  // Create local declarations to avoid rewriting all closure decl ref exprs.
+  // First, emit a declaration for all "by ref" decls.
+  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+       E = BlockByRefDecls.end(); I != E; ++I) {
+    S += "  ";
+    std::string Name = (*I)->getNameAsString();
+    std::string TypeString;
+    RewriteByRefString(TypeString, Name, (*I));
+    TypeString += " *";
+    Name = TypeString + Name;
+    S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
+  }
+  // Next, emit a declaration for all "by copy" declarations.
+  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+       E = BlockByCopyDecls.end(); I != E; ++I) {
+    S += "  ";
+    // Handle nested closure invocation. For example:
+    //
+    //   void (^myImportedClosure)(void);
+    //   myImportedClosure  = ^(void) { setGlobalInt(x + y); };
+    //
+    //   void (^anotherClosure)(void);
+    //   anotherClosure = ^(void) {
+    //     myImportedClosure(); // import and invoke the closure
+    //   };
+    //
+    if (isTopLevelBlockPointerType((*I)->getType())) {
+      RewriteBlockPointerTypeVariable(S, (*I));
+      S += " = (";
+      RewriteBlockPointerType(S, (*I)->getType());
+      S += ")";
+      S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
+    }
+    else {
+      std::string Name = (*I)->getNameAsString();
+      QualType QT = (*I)->getType();
+      if (HasLocalVariableExternalStorage(*I))
+        QT = Context->getPointerType(QT);
+      QT.getAsStringInternal(Name, Context->getPrintingPolicy());
+      S += Name + " = __cself->" +
+                              (*I)->getNameAsString() + "; // bound by copy\n";
+    }
+  }
+  std::string RewrittenStr = RewrittenBlockExprs[CE];
+  const char *cstr = RewrittenStr.c_str();
+  while (*cstr++ != '{') ;
+  S += cstr;
+  S += "\n";
+  return S;
+}
+
+std::string RewriteModernObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
+                                                   StringRef funcName,
+                                                   std::string Tag) {
+  std::string StructRef = "struct " + Tag;
+  std::string S = "static void __";
+
+  S += funcName;
+  S += "_block_copy_" + utostr(i);
+  S += "(" + StructRef;
+  S += "*dst, " + StructRef;
+  S += "*src) {";
+  for (ValueDecl *VD : ImportedBlockDecls) {
+    S += "_Block_object_assign((void*)&dst->";
+    S += VD->getNameAsString();
+    S += ", (void*)src->";
+    S += VD->getNameAsString();
+    if (BlockByRefDeclsPtrSet.count(VD))
+      S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
+    else if (VD->getType()->isBlockPointerType())
+      S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
+    else
+      S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
+  }
+  S += "}\n";
+
+  S += "\nstatic void __";
+  S += funcName;
+  S += "_block_dispose_" + utostr(i);
+  S += "(" + StructRef;
+  S += "*src) {";
+  for (ValueDecl *VD : ImportedBlockDecls) {
+    S += "_Block_object_dispose((void*)src->";
+    S += VD->getNameAsString();
+    if (BlockByRefDeclsPtrSet.count(VD))
+      S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
+    else if (VD->getType()->isBlockPointerType())
+      S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
+    else
+      S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
+  }
+  S += "}\n";
+  return S;
+}
+
+std::string RewriteModernObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
+                                             std::string Desc) {
+  std::string S = "\nstruct " + Tag;
+  std::string Constructor = "  " + Tag;
+
+  S += " {\n  struct __block_impl impl;\n";
+  S += "  struct " + Desc;
+  S += "* Desc;\n";
+
+  Constructor += "(void *fp, "; // Invoke function pointer.
+  Constructor += "struct " + Desc; // Descriptor pointer.
+  Constructor += " *desc";
+
+  if (BlockDeclRefs.size()) {
+    // Output all "by copy" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      S += "  ";
+      std::string FieldName = (*I)->getNameAsString();
+      std::string ArgName = "_" + FieldName;
+      // Handle nested closure invocation. For example:
+      //
+      //   void (^myImportedBlock)(void);
+      //   myImportedBlock  = ^(void) { setGlobalInt(x + y); };
+      //
+      //   void (^anotherBlock)(void);
+      //   anotherBlock = ^(void) {
+      //     myImportedBlock(); // import and invoke the closure
+      //   };
+      //
+      if (isTopLevelBlockPointerType((*I)->getType())) {
+        S += "struct __block_impl *";
+        Constructor += ", void *" + ArgName;
+      } else {
+        QualType QT = (*I)->getType();
+        if (HasLocalVariableExternalStorage(*I))
+          QT = Context->getPointerType(QT);
+        QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
+        QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
+        Constructor += ", " + ArgName;
+      }
+      S += FieldName + ";\n";
+    }
+    // Output all "by ref" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      S += "  ";
+      std::string FieldName = (*I)->getNameAsString();
+      std::string ArgName = "_" + FieldName;
+      {
+        std::string TypeString;
+        RewriteByRefString(TypeString, FieldName, (*I));
+        TypeString += " *";
+        FieldName = TypeString + FieldName;
+        ArgName = TypeString + ArgName;
+        Constructor += ", " + ArgName;
+      }
+      S += FieldName + "; // by ref\n";
+    }
+    // Finish writing the constructor.
+    Constructor += ", int flags=0)";
+    // Initialize all "by copy" arguments.
+    bool firsTime = true;
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      std::string Name = (*I)->getNameAsString();
+        if (firsTime) {
+          Constructor += " : ";
+          firsTime = false;
+        }
+        else
+          Constructor += ", ";
+        if (isTopLevelBlockPointerType((*I)->getType()))
+          Constructor += Name + "((struct __block_impl *)_" + Name + ")";
+        else
+          Constructor += Name + "(_" + Name + ")";
+    }
+    // Initialize all "by ref" arguments.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      std::string Name = (*I)->getNameAsString();
+      if (firsTime) {
+        Constructor += " : ";
+        firsTime = false;
+      }
+      else
+        Constructor += ", ";
+      Constructor += Name + "(_" + Name + "->__forwarding)";
+    }
+
+    Constructor += " {\n";
+    if (GlobalVarDecl)
+      Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
+    else
+      Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
+    Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
+
+    Constructor += "    Desc = desc;\n";
+  } else {
+    // Finish writing the constructor.
+    Constructor += ", int flags=0) {\n";
+    if (GlobalVarDecl)
+      Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
+    else
+      Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
+    Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
+    Constructor += "    Desc = desc;\n";
+  }
+  Constructor += "  ";
+  Constructor += "}\n";
+  S += Constructor;
+  S += "};\n";
+  return S;
+}
+
+std::string RewriteModernObjC::SynthesizeBlockDescriptor(std::string DescTag,
+                                                   std::string ImplTag, int i,
+                                                   StringRef FunName,
+                                                   unsigned hasCopy) {
+  std::string S = "\nstatic struct " + DescTag;
+
+  S += " {\n  size_t reserved;\n";
+  S += "  size_t Block_size;\n";
+  if (hasCopy) {
+    S += "  void (*copy)(struct ";
+    S += ImplTag; S += "*, struct ";
+    S += ImplTag; S += "*);\n";
+
+    S += "  void (*dispose)(struct ";
+    S += ImplTag; S += "*);\n";
+  }
+  S += "} ";
+
+  S += DescTag + "_DATA = { 0, sizeof(struct ";
+  S += ImplTag + ")";
+  if (hasCopy) {
+    S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
+    S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
+  }
+  S += "};\n";
+  return S;
+}
+
+void RewriteModernObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
+                                          StringRef FunName) {
+  bool RewriteSC = (GlobalVarDecl &&
+                    !Blocks.empty() &&
+                    GlobalVarDecl->getStorageClass() == SC_Static &&
+                    GlobalVarDecl->getType().getCVRQualifiers());
+  if (RewriteSC) {
+    std::string SC(" void __");
+    SC += GlobalVarDecl->getNameAsString();
+    SC += "() {}";
+    InsertText(FunLocStart, SC);
+  }
+
+  // Insert closures that were part of the function.
+  for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
+    CollectBlockDeclRefInfo(Blocks[i]);
+    // Need to copy-in the inner copied-in variables not actually used in this
+    // block.
+    for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
+      DeclRefExpr *Exp = InnerDeclRefs[count++];
+      ValueDecl *VD = Exp->getDecl();
+      BlockDeclRefs.push_back(Exp);
+      if (!VD->hasAttr<BlocksAttr>()) {
+        if (!BlockByCopyDeclsPtrSet.count(VD)) {
+          BlockByCopyDeclsPtrSet.insert(VD);
+          BlockByCopyDecls.push_back(VD);
+        }
+        continue;
+      }
+
+      if (!BlockByRefDeclsPtrSet.count(VD)) {
+        BlockByRefDeclsPtrSet.insert(VD);
+        BlockByRefDecls.push_back(VD);
+      }
+
+      // imported objects in the inner blocks not used in the outer
+      // blocks must be copied/disposed in the outer block as well.
+      if (VD->getType()->isObjCObjectPointerType() ||
+          VD->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(VD);
+    }
+
+    std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
+    std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
+
+    std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
+
+    InsertText(FunLocStart, CI);
+
+    std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
+
+    InsertText(FunLocStart, CF);
+
+    if (ImportedBlockDecls.size()) {
+      std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
+      InsertText(FunLocStart, HF);
+    }
+    std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
+                                               ImportedBlockDecls.size() > 0);
+    InsertText(FunLocStart, BD);
+
+    BlockDeclRefs.clear();
+    BlockByRefDecls.clear();
+    BlockByRefDeclsPtrSet.clear();
+    BlockByCopyDecls.clear();
+    BlockByCopyDeclsPtrSet.clear();
+    ImportedBlockDecls.clear();
+  }
+  if (RewriteSC) {
+    // Must insert any 'const/volatile/static here. Since it has been
+    // removed as result of rewriting of block literals.
+    std::string SC;
+    if (GlobalVarDecl->getStorageClass() == SC_Static)
+      SC = "static ";
+    if (GlobalVarDecl->getType().isConstQualified())
+      SC += "const ";
+    if (GlobalVarDecl->getType().isVolatileQualified())
+      SC += "volatile ";
+    if (GlobalVarDecl->getType().isRestrictQualified())
+      SC += "restrict ";
+    InsertText(FunLocStart, SC);
+  }
+  if (GlobalConstructionExp) {
+    // extra fancy dance for global literal expression.
+
+    // Always the latest block expression on the block stack.
+    std::string Tag = "__";
+    Tag += FunName;
+    Tag += "_block_impl_";
+    Tag += utostr(Blocks.size()-1);
+    std::string globalBuf = "static ";
+    globalBuf += Tag; globalBuf += " ";
+    std::string SStr;
+
+    llvm::raw_string_ostream constructorExprBuf(SStr);
+    GlobalConstructionExp->printPretty(constructorExprBuf, nullptr,
+                                       PrintingPolicy(LangOpts));
+    globalBuf += constructorExprBuf.str();
+    globalBuf += ";\n";
+    InsertText(FunLocStart, globalBuf);
+    GlobalConstructionExp = nullptr;
+  }
+
+  Blocks.clear();
+  InnerDeclRefsCount.clear();
+  InnerDeclRefs.clear();
+  RewrittenBlockExprs.clear();
+}
+
+void RewriteModernObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
+  SourceLocation FunLocStart =
+    (!Blocks.empty()) ? getFunctionSourceLocation(*this, FD)
+                      : FD->getTypeSpecStartLoc();
+  StringRef FuncName = FD->getName();
+
+  SynthesizeBlockLiterals(FunLocStart, FuncName);
+}
+
+static void BuildUniqueMethodName(std::string &Name,
+                                  ObjCMethodDecl *MD) {
+  ObjCInterfaceDecl *IFace = MD->getClassInterface();
+  Name = std::string(IFace->getName());
+  Name += "__" + MD->getSelector().getAsString();
+  // Convert colons to underscores.
+  std::string::size_type loc = 0;
+  while ((loc = Name.find(':', loc)) != std::string::npos)
+    Name.replace(loc, 1, "_");
+}
+
+void RewriteModernObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
+  // fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
+  // SourceLocation FunLocStart = MD->getBeginLoc();
+  SourceLocation FunLocStart = MD->getBeginLoc();
+  std::string FuncName;
+  BuildUniqueMethodName(FuncName, MD);
+  SynthesizeBlockLiterals(FunLocStart, FuncName);
+}
+
+void RewriteModernObjC::GetBlockDeclRefExprs(Stmt *S) {
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt) {
+      if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt))
+        GetBlockDeclRefExprs(CBE->getBody());
+      else
+        GetBlockDeclRefExprs(SubStmt);
+    }
+  // Handle specific things.
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
+    if (DRE->refersToEnclosingVariableOrCapture() ||
+        HasLocalVariableExternalStorage(DRE->getDecl()))
+      // FIXME: Handle enums.
+      BlockDeclRefs.push_back(DRE);
+}
+
+void RewriteModernObjC::GetInnerBlockDeclRefExprs(Stmt *S,
+                SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
+                llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt) {
+      if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt)) {
+        InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
+        GetInnerBlockDeclRefExprs(CBE->getBody(),
+                                  InnerBlockDeclRefs,
+                                  InnerContexts);
+      }
+      else
+        GetInnerBlockDeclRefExprs(SubStmt, InnerBlockDeclRefs, InnerContexts);
+    }
+  // Handle specific things.
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
+    if (DRE->refersToEnclosingVariableOrCapture() ||
+        HasLocalVariableExternalStorage(DRE->getDecl())) {
+      if (!InnerContexts.count(DRE->getDecl()->getDeclContext()))
+        InnerBlockDeclRefs.push_back(DRE);
+      if (VarDecl *Var = cast<VarDecl>(DRE->getDecl()))
+        if (Var->isFunctionOrMethodVarDecl())
+          ImportedLocalExternalDecls.insert(Var);
+    }
+  }
+}
+
+/// convertObjCTypeToCStyleType - This routine converts such objc types
+/// as qualified objects, and blocks to their closest c/c++ types that
+/// it can. It returns true if input type was modified.
+bool RewriteModernObjC::convertObjCTypeToCStyleType(QualType &T) {
+  QualType oldT = T;
+  convertBlockPointerToFunctionPointer(T);
+  if (T->isFunctionPointerType()) {
+    QualType PointeeTy;
+    if (const PointerType* PT = T->getAs<PointerType>()) {
+      PointeeTy = PT->getPointeeType();
+      if (const FunctionType *FT = PointeeTy->getAs<FunctionType>()) {
+        T = convertFunctionTypeOfBlocks(FT);
+        T = Context->getPointerType(T);
+      }
+    }
+  }
+
+  convertToUnqualifiedObjCType(T);
+  return T != oldT;
+}
+
+/// convertFunctionTypeOfBlocks - This routine converts a function type
+/// whose result type may be a block pointer or whose argument type(s)
+/// might be block pointers to an equivalent function type replacing
+/// all block pointers to function pointers.
+QualType RewriteModernObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
+  // FTP will be null for closures that don't take arguments.
+  // Generate a funky cast.
+  SmallVector<QualType, 8> ArgTypes;
+  QualType Res = FT->getReturnType();
+  bool modified = convertObjCTypeToCStyleType(Res);
+
+  if (FTP) {
+    for (auto &I : FTP->param_types()) {
+      QualType t = I;
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (convertObjCTypeToCStyleType(t))
+        modified = true;
+      ArgTypes.push_back(t);
+    }
+  }
+  QualType FuncType;
+  if (modified)
+    FuncType = getSimpleFunctionType(Res, ArgTypes);
+  else FuncType = QualType(FT, 0);
+  return FuncType;
+}
+
+Stmt *RewriteModernObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
+  // Navigate to relevant type information.
+  const BlockPointerType *CPT = nullptr;
+
+  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
+    CPT = DRE->getType()->getAs<BlockPointerType>();
+  } else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
+    CPT = MExpr->getType()->getAs<BlockPointerType>();
+  }
+  else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
+    return SynthesizeBlockCall(Exp, PRE->getSubExpr());
+  }
+  else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
+    CPT = IEXPR->getType()->getAs<BlockPointerType>();
+  else if (const ConditionalOperator *CEXPR =
+            dyn_cast<ConditionalOperator>(BlockExp)) {
+    Expr *LHSExp = CEXPR->getLHS();
+    Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
+    Expr *RHSExp = CEXPR->getRHS();
+    Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
+    Expr *CONDExp = CEXPR->getCond();
+    ConditionalOperator *CondExpr = new (Context) ConditionalOperator(
+        CONDExp, SourceLocation(), cast<Expr>(LHSStmt), SourceLocation(),
+        cast<Expr>(RHSStmt), Exp->getType(), VK_PRValue, OK_Ordinary);
+    return CondExpr;
+  } else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
+    CPT = IRE->getType()->getAs<BlockPointerType>();
+  } else if (const PseudoObjectExpr *POE
+               = dyn_cast<PseudoObjectExpr>(BlockExp)) {
+    CPT = POE->getType()->castAs<BlockPointerType>();
+  } else {
+    assert(false && "RewriteBlockClass: Bad type");
+  }
+  assert(CPT && "RewriteBlockClass: Bad type");
+  const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
+  assert(FT && "RewriteBlockClass: Bad type");
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
+  // FTP will be null for closures that don't take arguments.
+
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("__block_impl"));
+  QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
+
+  // Generate a funky cast.
+  SmallVector<QualType, 8> ArgTypes;
+
+  // Push the block argument type.
+  ArgTypes.push_back(PtrBlock);
+  if (FTP) {
+    for (auto &I : FTP->param_types()) {
+      QualType t = I;
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (!convertBlockPointerToFunctionPointer(t))
+        convertToUnqualifiedObjCType(t);
+      ArgTypes.push_back(t);
+    }
+  }
+  // Now do the pointer to function cast.
+  QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
+
+  PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
+
+  CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
+                                               CK_BitCast,
+                                               const_cast<Expr*>(BlockExp));
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                          BlkCast);
+  //PE->dump();
+
+  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("FuncPtr"),
+                                    Context->VoidPtrTy, nullptr,
+                                    /*BitWidth=*/nullptr, /*Mutable=*/true,
+                                    ICIS_NoInit);
+  MemberExpr *ME = MemberExpr::CreateImplicit(
+      *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
+
+  CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
+                                                CK_BitCast, ME);
+  PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
+
+  SmallVector<Expr*, 8> BlkExprs;
+  // Add the implicit argument.
+  BlkExprs.push_back(BlkCast);
+  // Add the user arguments.
+  for (CallExpr::arg_iterator I = Exp->arg_begin(),
+       E = Exp->arg_end(); I != E; ++I) {
+    BlkExprs.push_back(*I);
+  }
+  CallExpr *CE =
+      CallExpr::Create(*Context, PE, BlkExprs, Exp->getType(), VK_PRValue,
+                       SourceLocation(), FPOptionsOverride());
+  return CE;
+}
+
+// We need to return the rewritten expression to handle cases where the
+// DeclRefExpr is embedded in another expression being rewritten.
+// For example:
+//
+// int main() {
+//    __block Foo *f;
+//    __block int i;
+//
+//    void (^myblock)() = ^() {
+//        [f test]; // f is a DeclRefExpr embedded in a message (which is being rewritten).
+//        i = 77;
+//    };
+//}
+Stmt *RewriteModernObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
+  // Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
+  // for each DeclRefExp where BYREFVAR is name of the variable.
+  ValueDecl *VD = DeclRefExp->getDecl();
+  bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() ||
+                 HasLocalVariableExternalStorage(DeclRefExp->getDecl());
+
+  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("__forwarding"),
+                                    Context->VoidPtrTy, nullptr,
+                                    /*BitWidth=*/nullptr, /*Mutable=*/true,
+                                    ICIS_NoInit);
+  MemberExpr *ME = MemberExpr::CreateImplicit(
+      *Context, DeclRefExp, isArrow, FD, FD->getType(), VK_LValue, OK_Ordinary);
+
+  StringRef Name = VD->getName();
+  FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
+                         &Context->Idents.get(Name),
+                         Context->VoidPtrTy, nullptr,
+                         /*BitWidth=*/nullptr, /*Mutable=*/true,
+                         ICIS_NoInit);
+  ME = MemberExpr::CreateImplicit(*Context, ME, true, FD, DeclRefExp->getType(),
+                                  VK_LValue, OK_Ordinary);
+
+  // Need parens to enforce precedence.
+  ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
+                                          DeclRefExp->getExprLoc(),
+                                          ME);
+  ReplaceStmt(DeclRefExp, PE);
+  return PE;
+}
+
+// Rewrites the imported local variable V with external storage
+// (static, extern, etc.) as *V
+//
+Stmt *RewriteModernObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
+  ValueDecl *VD = DRE->getDecl();
+  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
+    if (!ImportedLocalExternalDecls.count(Var))
+      return DRE;
+  Expr *Exp = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), DRE, UO_Deref, DRE->getType(),
+      VK_LValue, OK_Ordinary, DRE->getLocation(), false, FPOptionsOverride());
+  // Need parens to enforce precedence.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                          Exp);
+  ReplaceStmt(DRE, PE);
+  return PE;
+}
+
+void RewriteModernObjC::RewriteCastExpr(CStyleCastExpr *CE) {
+  SourceLocation LocStart = CE->getLParenLoc();
+  SourceLocation LocEnd = CE->getRParenLoc();
+
+  // Need to avoid trying to rewrite synthesized casts.
+  if (LocStart.isInvalid())
+    return;
+  // Need to avoid trying to rewrite casts contained in macros.
+  if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
+    return;
+
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+  QualType QT = CE->getType();
+  const Type* TypePtr = QT->getAs<Type>();
+  if (isa<TypeOfExprType>(TypePtr)) {
+    const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
+    QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
+    std::string TypeAsString = "(";
+    RewriteBlockPointerType(TypeAsString, QT);
+    TypeAsString += ")";
+    ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
+    return;
+  }
+  // advance the location to startArgList.
+  const char *argPtr = startBuf;
+
+  while (*argPtr++ && (argPtr < endBuf)) {
+    switch (*argPtr) {
+    case '^':
+      // Replace the '^' with '*'.
+      LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
+      ReplaceText(LocStart, 1, "*");
+      break;
+    }
+  }
+}
+
+void RewriteModernObjC::RewriteImplicitCastObjCExpr(CastExpr *IC) {
+  CastKind CastKind = IC->getCastKind();
+  if (CastKind != CK_BlockPointerToObjCPointerCast &&
+      CastKind != CK_AnyPointerToBlockPointerCast)
+    return;
+
+  QualType QT = IC->getType();
+  (void)convertBlockPointerToFunctionPointer(QT);
+  std::string TypeString(QT.getAsString(Context->getPrintingPolicy()));
+  std::string Str = "(";
+  Str += TypeString;
+  Str += ")";
+  InsertText(IC->getSubExpr()->getBeginLoc(), Str);
+}
+
+void RewriteModernObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
+  SourceLocation DeclLoc = FD->getLocation();
+  unsigned parenCount = 0;
+
+  // We have 1 or more arguments that have closure pointers.
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  const char *startArgList = strchr(startBuf, '(');
+
+  assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
+
+  parenCount++;
+  // advance the location to startArgList.
+  DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
+  assert((DeclLoc.isValid()) && "Invalid DeclLoc");
+
+  const char *argPtr = startArgList;
+
+  while (*argPtr++ && parenCount) {
+    switch (*argPtr) {
+    case '^':
+      // Replace the '^' with '*'.
+      DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
+      ReplaceText(DeclLoc, 1, "*");
+      break;
+    case '(':
+      parenCount++;
+      break;
+    case ')':
+      parenCount--;
+      break;
+    }
+  }
+}
+
+bool RewriteModernObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
+  const FunctionProtoType *FTP;
+  const PointerType *PT = QT->getAs<PointerType>();
+  if (PT) {
+    FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
+  } else {
+    const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
+    assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
+    FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
+  }
+  if (FTP) {
+    for (const auto &I : FTP->param_types())
+      if (isTopLevelBlockPointerType(I))
+        return true;
+  }
+  return false;
+}
+
+bool RewriteModernObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
+  const FunctionProtoType *FTP;
+  const PointerType *PT = QT->getAs<PointerType>();
+  if (PT) {
+    FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
+  } else {
+    const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
+    assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
+    FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
+  }
+  if (FTP) {
+    for (const auto &I : FTP->param_types()) {
+      if (I->isObjCQualifiedIdType())
+        return true;
+      if (I->isObjCObjectPointerType() &&
+          I->getPointeeType()->isObjCQualifiedInterfaceType())
+        return true;
+    }
+
+  }
+  return false;
+}
+
+void RewriteModernObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
+                                     const char *&RParen) {
+  const char *argPtr = strchr(Name, '(');
+  assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
+
+  LParen = argPtr; // output the start.
+  argPtr++; // skip past the left paren.
+  unsigned parenCount = 1;
+
+  while (*argPtr && parenCount) {
+    switch (*argPtr) {
+    case '(': parenCount++; break;
+    case ')': parenCount--; break;
+    default: break;
+    }
+    if (parenCount) argPtr++;
+  }
+  assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
+  RParen = argPtr; // output the end
+}
+
+void RewriteModernObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
+    RewriteBlockPointerFunctionArgs(FD);
+    return;
+  }
+  // Handle Variables and Typedefs.
+  SourceLocation DeclLoc = ND->getLocation();
+  QualType DeclT;
+  if (VarDecl *VD = dyn_cast<VarDecl>(ND))
+    DeclT = VD->getType();
+  else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
+    DeclT = TDD->getUnderlyingType();
+  else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
+    DeclT = FD->getType();
+  else
+    llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
+
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  const char *endBuf = startBuf;
+  // scan backward (from the decl location) for the end of the previous decl.
+  while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
+    startBuf--;
+  SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
+  std::string buf;
+  unsigned OrigLength=0;
+  // *startBuf != '^' if we are dealing with a pointer to function that
+  // may take block argument types (which will be handled below).
+  if (*startBuf == '^') {
+    // Replace the '^' with '*', computing a negative offset.
+    buf = '*';
+    startBuf++;
+    OrigLength++;
+  }
+  while (*startBuf != ')') {
+    buf += *startBuf;
+    startBuf++;
+    OrigLength++;
+  }
+  buf += ')';
+  OrigLength++;
+
+  if (PointerTypeTakesAnyBlockArguments(DeclT) ||
+      PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
+    // Replace the '^' with '*' for arguments.
+    // Replace id<P> with id/*<>*/
+    DeclLoc = ND->getLocation();
+    startBuf = SM->getCharacterData(DeclLoc);
+    const char *argListBegin, *argListEnd;
+    GetExtentOfArgList(startBuf, argListBegin, argListEnd);
+    while (argListBegin < argListEnd) {
+      if (*argListBegin == '^')
+        buf += '*';
+      else if (*argListBegin ==  '<') {
+        buf += "/*";
+        buf += *argListBegin++;
+        OrigLength++;
+        while (*argListBegin != '>') {
+          buf += *argListBegin++;
+          OrigLength++;
+        }
+        buf += *argListBegin;
+        buf += "*/";
+      }
+      else
+        buf += *argListBegin;
+      argListBegin++;
+      OrigLength++;
+    }
+    buf += ')';
+    OrigLength++;
+  }
+  ReplaceText(Start, OrigLength, buf);
+}
+
+/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
+/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
+///                    struct Block_byref_id_object *src) {
+///  _Block_object_assign (&_dest->object, _src->object,
+///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
+///                        [|BLOCK_FIELD_IS_WEAK]) // object
+///  _Block_object_assign(&_dest->object, _src->object,
+///                       BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
+///                       [|BLOCK_FIELD_IS_WEAK]) // block
+/// }
+/// And:
+/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
+///  _Block_object_dispose(_src->object,
+///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
+///                        [|BLOCK_FIELD_IS_WEAK]) // object
+///  _Block_object_dispose(_src->object,
+///                         BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
+///                         [|BLOCK_FIELD_IS_WEAK]) // block
+/// }
+
+std::string RewriteModernObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
+                                                          int flag) {
+  std::string S;
+  if (CopyDestroyCache.count(flag))
+    return S;
+  CopyDestroyCache.insert(flag);
+  S = "static void __Block_byref_id_object_copy_";
+  S += utostr(flag);
+  S += "(void *dst, void *src) {\n";
+
+  // offset into the object pointer is computed as:
+  // void * + void* + int + int + void* + void *
+  unsigned IntSize =
+  static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+  unsigned VoidPtrSize =
+  static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
+
+  unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
+  S += " _Block_object_assign((char*)dst + ";
+  S += utostr(offset);
+  S += ", *(void * *) ((char*)src + ";
+  S += utostr(offset);
+  S += "), ";
+  S += utostr(flag);
+  S += ");\n}\n";
+
+  S += "static void __Block_byref_id_object_dispose_";
+  S += utostr(flag);
+  S += "(void *src) {\n";
+  S += " _Block_object_dispose(*(void * *) ((char*)src + ";
+  S += utostr(offset);
+  S += "), ";
+  S += utostr(flag);
+  S += ");\n}\n";
+  return S;
+}
+
+/// RewriteByRefVar - For each __block typex ND variable this routine transforms
+/// the declaration into:
+/// struct __Block_byref_ND {
+/// void *__isa;                  // NULL for everything except __weak pointers
+/// struct __Block_byref_ND *__forwarding;
+/// int32_t __flags;
+/// int32_t __size;
+/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
+/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
+/// typex ND;
+/// };
+///
+/// It then replaces declaration of ND variable with:
+/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
+///                               __size=sizeof(struct __Block_byref_ND),
+///                               ND=initializer-if-any};
+///
+///
+void RewriteModernObjC::RewriteByRefVar(VarDecl *ND, bool firstDecl,
+                                        bool lastDecl) {
+  int flag = 0;
+  int isa = 0;
+  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
+  if (DeclLoc.isInvalid())
+    // If type location is missing, it is because of missing type (a warning).
+    // Use variable's location which is good for this case.
+    DeclLoc = ND->getLocation();
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  SourceLocation X = ND->getEndLoc();
+  X = SM->getExpansionLoc(X);
+  const char *endBuf = SM->getCharacterData(X);
+  std::string Name(ND->getNameAsString());
+  std::string ByrefType;
+  RewriteByRefString(ByrefType, Name, ND, true);
+  ByrefType += " {\n";
+  ByrefType += "  void *__isa;\n";
+  RewriteByRefString(ByrefType, Name, ND);
+  ByrefType += " *__forwarding;\n";
+  ByrefType += " int __flags;\n";
+  ByrefType += " int __size;\n";
+  // Add void *__Block_byref_id_object_copy;
+  // void *__Block_byref_id_object_dispose; if needed.
+  QualType Ty = ND->getType();
+  bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
+  if (HasCopyAndDispose) {
+    ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
+    ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
+  }
+
+  QualType T = Ty;
+  (void)convertBlockPointerToFunctionPointer(T);
+  T.getAsStringInternal(Name, Context->getPrintingPolicy());
+
+  ByrefType += " " + Name + ";\n";
+  ByrefType += "};\n";
+  // Insert this type in global scope. It is needed by helper function.
+  SourceLocation FunLocStart;
+  if (CurFunctionDef)
+     FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
+  else {
+    assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
+    FunLocStart = CurMethodDef->getBeginLoc();
+  }
+  InsertText(FunLocStart, ByrefType);
+
+  if (Ty.isObjCGCWeak()) {
+    flag |= BLOCK_FIELD_IS_WEAK;
+    isa = 1;
+  }
+  if (HasCopyAndDispose) {
+    flag = BLOCK_BYREF_CALLER;
+    QualType Ty = ND->getType();
+    // FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
+    if (Ty->isBlockPointerType())
+      flag |= BLOCK_FIELD_IS_BLOCK;
+    else
+      flag |= BLOCK_FIELD_IS_OBJECT;
+    std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
+    if (!HF.empty())
+      Preamble += HF;
+  }
+
+  // struct __Block_byref_ND ND =
+  // {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
+  //  initializer-if-any};
+  bool hasInit = (ND->getInit() != nullptr);
+  // FIXME. rewriter does not support __block c++ objects which
+  // require construction.
+  if (hasInit)
+    if (CXXConstructExpr *CExp = dyn_cast<CXXConstructExpr>(ND->getInit())) {
+      CXXConstructorDecl *CXXDecl = CExp->getConstructor();
+      if (CXXDecl && CXXDecl->isDefaultConstructor())
+        hasInit = false;
+    }
+
+  unsigned flags = 0;
+  if (HasCopyAndDispose)
+    flags |= BLOCK_HAS_COPY_DISPOSE;
+  Name = ND->getNameAsString();
+  ByrefType.clear();
+  RewriteByRefString(ByrefType, Name, ND);
+  std::string ForwardingCastType("(");
+  ForwardingCastType += ByrefType + " *)";
+  ByrefType += " " + Name + " = {(void*)";
+  ByrefType += utostr(isa);
+  ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
+  ByrefType += utostr(flags);
+  ByrefType += ", ";
+  ByrefType += "sizeof(";
+  RewriteByRefString(ByrefType, Name, ND);
+  ByrefType += ")";
+  if (HasCopyAndDispose) {
+    ByrefType += ", __Block_byref_id_object_copy_";
+    ByrefType += utostr(flag);
+    ByrefType += ", __Block_byref_id_object_dispose_";
+    ByrefType += utostr(flag);
+  }
+
+  if (!firstDecl) {
+    // In multiple __block declarations, and for all but 1st declaration,
+    // find location of the separating comma. This would be start location
+    // where new text is to be inserted.
+    DeclLoc = ND->getLocation();
+    const char *startDeclBuf = SM->getCharacterData(DeclLoc);
+    const char *commaBuf = startDeclBuf;
+    while (*commaBuf != ',')
+      commaBuf--;
+    assert((*commaBuf == ',') && "RewriteByRefVar: can't find ','");
+    DeclLoc = DeclLoc.getLocWithOffset(commaBuf - startDeclBuf);
+    startBuf = commaBuf;
+  }
+
+  if (!hasInit) {
+    ByrefType += "};\n";
+    unsigned nameSize = Name.size();
+    // for block or function pointer declaration. Name is already
+    // part of the declaration.
+    if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
+      nameSize = 1;
+    ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
+  }
+  else {
+    ByrefType += ", ";
+    SourceLocation startLoc;
+    Expr *E = ND->getInit();
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
+      startLoc = ECE->getLParenLoc();
+    else
+      startLoc = E->getBeginLoc();
+    startLoc = SM->getExpansionLoc(startLoc);
+    endBuf = SM->getCharacterData(startLoc);
+    ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
+
+    const char separator = lastDecl ? ';' : ',';
+    const char *startInitializerBuf = SM->getCharacterData(startLoc);
+    const char *separatorBuf = strchr(startInitializerBuf, separator);
+    assert((*separatorBuf == separator) &&
+           "RewriteByRefVar: can't find ';' or ','");
+    SourceLocation separatorLoc =
+      startLoc.getLocWithOffset(separatorBuf-startInitializerBuf);
+
+    InsertText(separatorLoc, lastDecl ? "}" : "};\n");
+  }
+}
+
+void RewriteModernObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
+  // Add initializers for any closure decl refs.
+  GetBlockDeclRefExprs(Exp->getBody());
+  if (BlockDeclRefs.size()) {
+    // Unique all "by copy" declarations.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
+        if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
+          BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
+          BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
+        }
+      }
+    // Unique all "by ref" declarations.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
+        if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
+          BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
+          BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
+        }
+      }
+    // Find any imported blocks...they will need special attention.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
+          BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
+          BlockDeclRefs[i]->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
+  }
+}
+
+FunctionDecl *RewriteModernObjC::SynthBlockInitFunctionDecl(StringRef name) {
+  IdentifierInfo *ID = &Context->Idents.get(name);
+  QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
+  return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
+                              SourceLocation(), ID, FType, nullptr, SC_Extern,
+                              false, false);
+}
+
+Stmt *RewriteModernObjC::SynthBlockInitExpr(BlockExpr *Exp,
+                     const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
+  const BlockDecl *block = Exp->getBlockDecl();
+
+  Blocks.push_back(Exp);
+
+  CollectBlockDeclRefInfo(Exp);
+
+  // Add inner imported variables now used in current block.
+  int countOfInnerDecls = 0;
+  if (!InnerBlockDeclRefs.empty()) {
+    for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
+      DeclRefExpr *Exp = InnerBlockDeclRefs[i];
+      ValueDecl *VD = Exp->getDecl();
+      if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
+      // We need to save the copied-in variables in nested
+      // blocks because it is needed at the end for some of the API generations.
+      // See SynthesizeBlockLiterals routine.
+        InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
+        BlockDeclRefs.push_back(Exp);
+        BlockByCopyDeclsPtrSet.insert(VD);
+        BlockByCopyDecls.push_back(VD);
+      }
+      if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
+        InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
+        BlockDeclRefs.push_back(Exp);
+        BlockByRefDeclsPtrSet.insert(VD);
+        BlockByRefDecls.push_back(VD);
+      }
+    }
+    // Find any imported blocks...they will need special attention.
+    for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
+      if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
+          InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
+          InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
+  }
+  InnerDeclRefsCount.push_back(countOfInnerDecls);
+
+  std::string FuncName;
+
+  if (CurFunctionDef)
+    FuncName = CurFunctionDef->getNameAsString();
+  else if (CurMethodDef)
+    BuildUniqueMethodName(FuncName, CurMethodDef);
+  else if (GlobalVarDecl)
+    FuncName = std::string(GlobalVarDecl->getNameAsString());
+
+  bool GlobalBlockExpr =
+    block->getDeclContext()->getRedeclContext()->isFileContext();
+
+  if (GlobalBlockExpr && !GlobalVarDecl) {
+    Diags.Report(block->getLocation(), GlobalBlockRewriteFailedDiag);
+    GlobalBlockExpr = false;
+  }
+
+  std::string BlockNumber = utostr(Blocks.size()-1);
+
+  std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
+
+  // Get a pointer to the function type so we can cast appropriately.
+  QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
+  QualType FType = Context->getPointerType(BFT);
+
+  FunctionDecl *FD;
+  Expr *NewRep;
+
+  // Simulate a constructor call...
+  std::string Tag;
+
+  if (GlobalBlockExpr)
+    Tag = "__global_";
+  else
+    Tag = "__";
+  Tag += FuncName + "_block_impl_" + BlockNumber;
+
+  FD = SynthBlockInitFunctionDecl(Tag);
+  DeclRefExpr *DRE = new (Context)
+      DeclRefExpr(*Context, FD, false, FType, VK_PRValue, SourceLocation());
+
+  SmallVector<Expr*, 4> InitExprs;
+
+  // Initialize the block function.
+  FD = SynthBlockInitFunctionDecl(Func);
+  DeclRefExpr *Arg = new (Context) DeclRefExpr(
+      *Context, FD, false, FD->getType(), VK_LValue, SourceLocation());
+  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
+                                                CK_BitCast, Arg);
+  InitExprs.push_back(castExpr);
+
+  // Initialize the block descriptor.
+  std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
+
+  VarDecl *NewVD = VarDecl::Create(
+      *Context, TUDecl, SourceLocation(), SourceLocation(),
+      &Context->Idents.get(DescData), Context->VoidPtrTy, nullptr, SC_Static);
+  UnaryOperator *DescRefExpr = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context),
+      new (Context) DeclRefExpr(*Context, NewVD, false, Context->VoidPtrTy,
+                                VK_LValue, SourceLocation()),
+      UO_AddrOf, Context->getPointerType(Context->VoidPtrTy), VK_PRValue,
+      OK_Ordinary, SourceLocation(), false, FPOptionsOverride());
+  InitExprs.push_back(DescRefExpr);
+
+  // Add initializers for any closure decl refs.
+  if (BlockDeclRefs.size()) {
+    Expr *Exp;
+    // Output all "by copy" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      if (isObjCType((*I)->getType())) {
+        // FIXME: Conform to ABI ([[obj retain] autorelease]).
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                        VK_LValue, SourceLocation());
+        if (HasLocalVariableExternalStorage(*I)) {
+          QualType QT = (*I)->getType();
+          QT = Context->getPointerType(QT);
+          Exp = UnaryOperator::Create(const_cast<ASTContext &>(*Context), Exp,
+                                      UO_AddrOf, QT, VK_PRValue, OK_Ordinary,
+                                      SourceLocation(), false,
+                                      FPOptionsOverride());
+        }
+      } else if (isTopLevelBlockPointerType((*I)->getType())) {
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Arg = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                        VK_LValue, SourceLocation());
+        Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
+                                       CK_BitCast, Arg);
+      } else {
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                        VK_LValue, SourceLocation());
+        if (HasLocalVariableExternalStorage(*I)) {
+          QualType QT = (*I)->getType();
+          QT = Context->getPointerType(QT);
+          Exp = UnaryOperator::Create(const_cast<ASTContext &>(*Context), Exp,
+                                      UO_AddrOf, QT, VK_PRValue, OK_Ordinary,
+                                      SourceLocation(), false,
+                                      FPOptionsOverride());
+        }
+
+      }
+      InitExprs.push_back(Exp);
+    }
+    // Output all "by ref" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      ValueDecl *ND = (*I);
+      std::string Name(ND->getNameAsString());
+      std::string RecName;
+      RewriteByRefString(RecName, Name, ND, true);
+      IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
+                                                + sizeof("struct"));
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+
+      FD = SynthBlockInitFunctionDecl((*I)->getName());
+      Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                      VK_LValue, SourceLocation());
+      bool isNestedCapturedVar = false;
+      if (block)
+        for (const auto &CI : block->captures()) {
+          const VarDecl *variable = CI.getVariable();
+          if (variable == ND && CI.isNested()) {
+            assert (CI.isByRef() &&
+                    "SynthBlockInitExpr - captured block variable is not byref");
+            isNestedCapturedVar = true;
+            break;
+          }
+        }
+      // captured nested byref variable has its address passed. Do not take
+      // its address again.
+      if (!isNestedCapturedVar)
+        Exp = UnaryOperator::Create(
+            const_cast<ASTContext &>(*Context), Exp, UO_AddrOf,
+            Context->getPointerType(Exp->getType()), VK_PRValue, OK_Ordinary,
+            SourceLocation(), false, FPOptionsOverride());
+      Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
+      InitExprs.push_back(Exp);
+    }
+  }
+  if (ImportedBlockDecls.size()) {
+    // generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
+    int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
+    unsigned IntSize =
+      static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+    Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
+                                           Context->IntTy, SourceLocation());
+    InitExprs.push_back(FlagExp);
+  }
+  NewRep = CallExpr::Create(*Context, DRE, InitExprs, FType, VK_LValue,
+                            SourceLocation(), FPOptionsOverride());
+
+  if (GlobalBlockExpr) {
+    assert (!GlobalConstructionExp &&
+            "SynthBlockInitExpr - GlobalConstructionExp must be null");
+    GlobalConstructionExp = NewRep;
+    NewRep = DRE;
+  }
+
+  NewRep = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), NewRep, UO_AddrOf,
+      Context->getPointerType(NewRep->getType()), VK_PRValue, OK_Ordinary,
+      SourceLocation(), false, FPOptionsOverride());
+  NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
+                                    NewRep);
+  // Put Paren around the call.
+  NewRep = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                   NewRep);
+
+  BlockDeclRefs.clear();
+  BlockByRefDecls.clear();
+  BlockByRefDeclsPtrSet.clear();
+  BlockByCopyDecls.clear();
+  BlockByCopyDeclsPtrSet.clear();
+  ImportedBlockDecls.clear();
+  return NewRep;
+}
+
+bool RewriteModernObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
+  if (const ObjCForCollectionStmt * CS =
+      dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
+        return CS->getElement() == DS;
+  return false;
+}
+
+//===----------------------------------------------------------------------===//
+// Function Body / Expression rewriting
+//===----------------------------------------------------------------------===//
+
+Stmt *RewriteModernObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
+  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
+      isa<DoStmt>(S) || isa<ForStmt>(S))
+    Stmts.push_back(S);
+  else if (isa<ObjCForCollectionStmt>(S)) {
+    Stmts.push_back(S);
+    ObjCBcLabelNo.push_back(++BcLabelCount);
+  }
+
+  // Pseudo-object operations and ivar references need special
+  // treatment because we're going to recursively rewrite them.
+  if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
+    if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
+      return RewritePropertyOrImplicitSetter(PseudoOp);
+    } else {
+      return RewritePropertyOrImplicitGetter(PseudoOp);
+    }
+  } else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
+    return RewriteObjCIvarRefExpr(IvarRefExpr);
+  }
+  else if (isa<OpaqueValueExpr>(S))
+    S = cast<OpaqueValueExpr>(S)->getSourceExpr();
+
+  SourceRange OrigStmtRange = S->getSourceRange();
+
+  // Perform a bottom up rewrite of all children.
+  for (Stmt *&childStmt : S->children())
+    if (childStmt) {
+      Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
+      if (newStmt) {
+        childStmt = newStmt;
+      }
+    }
+
+  if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
+    SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
+    llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
+    InnerContexts.insert(BE->getBlockDecl());
+    ImportedLocalExternalDecls.clear();
+    GetInnerBlockDeclRefExprs(BE->getBody(),
+                              InnerBlockDeclRefs, InnerContexts);
+    // Rewrite the block body in place.
+    Stmt *SaveCurrentBody = CurrentBody;
+    CurrentBody = BE->getBody();
+    PropParentMap = nullptr;
+    // block literal on rhs of a property-dot-sytax assignment
+    // must be replaced by its synthesize ast so getRewrittenText
+    // works as expected. In this case, what actually ends up on RHS
+    // is the blockTranscribed which is the helper function for the
+    // block literal; as in: self.c = ^() {[ace ARR];};
+    bool saveDisableReplaceStmt = DisableReplaceStmt;
+    DisableReplaceStmt = false;
+    RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
+    DisableReplaceStmt = saveDisableReplaceStmt;
+    CurrentBody = SaveCurrentBody;
+    PropParentMap = nullptr;
+    ImportedLocalExternalDecls.clear();
+    // Now we snarf the rewritten text and stash it away for later use.
+    std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
+    RewrittenBlockExprs[BE] = Str;
+
+    Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
+
+    //blockTranscribed->dump();
+    ReplaceStmt(S, blockTranscribed);
+    return blockTranscribed;
+  }
+  // Handle specific things.
+  if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
+    return RewriteAtEncode(AtEncode);
+
+  if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
+    return RewriteAtSelector(AtSelector);
+
+  if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
+    return RewriteObjCStringLiteral(AtString);
+
+  if (ObjCBoolLiteralExpr *BoolLitExpr = dyn_cast<ObjCBoolLiteralExpr>(S))
+    return RewriteObjCBoolLiteralExpr(BoolLitExpr);
+
+  if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(S))
+    return RewriteObjCBoxedExpr(BoxedExpr);
+
+  if (ObjCArrayLiteral *ArrayLitExpr = dyn_cast<ObjCArrayLiteral>(S))
+    return RewriteObjCArrayLiteralExpr(ArrayLitExpr);
+
+  if (ObjCDictionaryLiteral *DictionaryLitExpr =
+        dyn_cast<ObjCDictionaryLiteral>(S))
+    return RewriteObjCDictionaryLiteralExpr(DictionaryLitExpr);
+
+  if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
+#if 0
+    // Before we rewrite it, put the original message expression in a comment.
+    SourceLocation startLoc = MessExpr->getBeginLoc();
+    SourceLocation endLoc = MessExpr->getEndLoc();
+
+    const char *startBuf = SM->getCharacterData(startLoc);
+    const char *endBuf = SM->getCharacterData(endLoc);
+
+    std::string messString;
+    messString += "// ";
+    messString.append(startBuf, endBuf-startBuf+1);
+    messString += "\n";
+
+    // FIXME: Missing definition of
+    // InsertText(clang::SourceLocation, char const*, unsigned int).
+    // InsertText(startLoc, messString);
+    // Tried this, but it didn't work either...
+    // ReplaceText(startLoc, 0, messString.c_str(), messString.size());
+#endif
+    return RewriteMessageExpr(MessExpr);
+  }
+
+  if (ObjCAutoreleasePoolStmt *StmtAutoRelease =
+        dyn_cast<ObjCAutoreleasePoolStmt>(S)) {
+    return RewriteObjCAutoreleasePoolStmt(StmtAutoRelease);
+  }
+
+  if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
+    return RewriteObjCTryStmt(StmtTry);
+
+  if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
+    return RewriteObjCSynchronizedStmt(StmtTry);
+
+  if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
+    return RewriteObjCThrowStmt(StmtThrow);
+
+  if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
+    return RewriteObjCProtocolExpr(ProtocolExp);
+
+  if (ObjCForCollectionStmt *StmtForCollection =
+        dyn_cast<ObjCForCollectionStmt>(S))
+    return RewriteObjCForCollectionStmt(StmtForCollection,
+                                        OrigStmtRange.getEnd());
+  if (BreakStmt *StmtBreakStmt =
+      dyn_cast<BreakStmt>(S))
+    return RewriteBreakStmt(StmtBreakStmt);
+  if (ContinueStmt *StmtContinueStmt =
+      dyn_cast<ContinueStmt>(S))
+    return RewriteContinueStmt(StmtContinueStmt);
+
+  // Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
+  // and cast exprs.
+  if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
+    // FIXME: What we're doing here is modifying the type-specifier that
+    // precedes the first Decl.  In the future the DeclGroup should have
+    // a separate type-specifier that we can rewrite.
+    // NOTE: We need to avoid rewriting the DeclStmt if it is within
+    // the context of an ObjCForCollectionStmt. For example:
+    //   NSArray *someArray;
+    //   for (id <FooProtocol> index in someArray) ;
+    // This is because RewriteObjCForCollectionStmt() does textual rewriting
+    // and it depends on the original text locations/positions.
+    if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
+      RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
+
+    // Blocks rewrite rules.
+    for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
+         DI != DE; ++DI) {
+      Decl *SD = *DI;
+      if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
+        if (isTopLevelBlockPointerType(ND->getType()))
+          RewriteBlockPointerDecl(ND);
+        else if (ND->getType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(ND->getType(), ND);
+        if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
+          if (VD->hasAttr<BlocksAttr>()) {
+            static unsigned uniqueByrefDeclCount = 0;
+            assert(!BlockByRefDeclNo.count(ND) &&
+              "RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
+            BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
+            RewriteByRefVar(VD, (DI == DS->decl_begin()), ((DI+1) == DE));
+          }
+          else
+            RewriteTypeOfDecl(VD);
+        }
+      }
+      if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
+        if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+          RewriteBlockPointerDecl(TD);
+        else if (TD->getUnderlyingType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+      }
+    }
+  }
+
+  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
+    RewriteObjCQualifiedInterfaceTypes(CE);
+
+  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
+      isa<DoStmt>(S) || isa<ForStmt>(S)) {
+    assert(!Stmts.empty() && "Statement stack is empty");
+    assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
+             isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
+            && "Statement stack mismatch");
+    Stmts.pop_back();
+  }
+  // Handle blocks rewriting.
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
+    ValueDecl *VD = DRE->getDecl();
+    if (VD->hasAttr<BlocksAttr>())
+      return RewriteBlockDeclRefExpr(DRE);
+    if (HasLocalVariableExternalStorage(VD))
+      return RewriteLocalVariableExternalStorage(DRE);
+  }
+
+  if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
+    if (CE->getCallee()->getType()->isBlockPointerType()) {
+      Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
+      ReplaceStmt(S, BlockCall);
+      return BlockCall;
+    }
+  }
+  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
+    RewriteCastExpr(CE);
+  }
+  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
+    RewriteImplicitCastObjCExpr(ICE);
+  }
+#if 0
+
+  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
+    CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
+                                                   ICE->getSubExpr(),
+                                                   SourceLocation());
+    // Get the new text.
+    std::string SStr;
+    llvm::raw_string_ostream Buf(SStr);
+    Replacement->printPretty(Buf);
+    const std::string &Str = Buf.str();
+
+    printf("CAST = %s\n", &Str[0]);
+    InsertText(ICE->getSubExpr()->getBeginLoc(), Str);
+    delete S;
+    return Replacement;
+  }
+#endif
+  // Return this stmt unmodified.
+  return S;
+}
+
+void RewriteModernObjC::RewriteRecordBody(RecordDecl *RD) {
+  for (auto *FD : RD->fields()) {
+    if (isTopLevelBlockPointerType(FD->getType()))
+      RewriteBlockPointerDecl(FD);
+    if (FD->getType()->isObjCQualifiedIdType() ||
+        FD->getType()->isObjCQualifiedInterfaceType())
+      RewriteObjCQualifiedInterfaceTypes(FD);
+  }
+}
+
+/// HandleDeclInMainFile - This is called for each top-level decl defined in the
+/// main file of the input.
+void RewriteModernObjC::HandleDeclInMainFile(Decl *D) {
+  switch (D->getKind()) {
+    case Decl::Function: {
+      FunctionDecl *FD = cast<FunctionDecl>(D);
+      if (FD->isOverloadedOperator())
+        return;
+
+      // Since function prototypes don't have ParmDecl's, we check the function
+      // prototype. This enables us to rewrite function declarations and
+      // definitions using the same code.
+      RewriteBlocksInFunctionProtoType(FD->getType(), FD);
+
+      if (!FD->isThisDeclarationADefinition())
+        break;
+
+      // FIXME: If this should support Obj-C++, support CXXTryStmt
+      if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
+        CurFunctionDef = FD;
+        CurrentBody = Body;
+        Body =
+        cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
+        FD->setBody(Body);
+        CurrentBody = nullptr;
+        if (PropParentMap) {
+          delete PropParentMap;
+          PropParentMap = nullptr;
+        }
+        // This synthesizes and inserts the block "impl" struct, invoke function,
+        // and any copy/dispose helper functions.
+        InsertBlockLiteralsWithinFunction(FD);
+        RewriteLineDirective(D);
+        CurFunctionDef = nullptr;
+      }
+      break;
+    }
+    case Decl::ObjCMethod: {
+      ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
+      if (CompoundStmt *Body = MD->getCompoundBody()) {
+        CurMethodDef = MD;
+        CurrentBody = Body;
+        Body =
+          cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
+        MD->setBody(Body);
+        CurrentBody = nullptr;
+        if (PropParentMap) {
+          delete PropParentMap;
+          PropParentMap = nullptr;
+        }
+        InsertBlockLiteralsWithinMethod(MD);
+        RewriteLineDirective(D);
+        CurMethodDef = nullptr;
+      }
+      break;
+    }
+    case Decl::ObjCImplementation: {
+      ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(D);
+      ClassImplementation.push_back(CI);
+      break;
+    }
+    case Decl::ObjCCategoryImpl: {
+      ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(D);
+      CategoryImplementation.push_back(CI);
+      break;
+    }
+    case Decl::Var: {
+      VarDecl *VD = cast<VarDecl>(D);
+      RewriteObjCQualifiedInterfaceTypes(VD);
+      if (isTopLevelBlockPointerType(VD->getType()))
+        RewriteBlockPointerDecl(VD);
+      else if (VD->getType()->isFunctionPointerType()) {
+        CheckFunctionPointerDecl(VD->getType(), VD);
+        if (VD->getInit()) {
+          if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
+            RewriteCastExpr(CE);
+          }
+        }
+      } else if (VD->getType()->isRecordType()) {
+        RecordDecl *RD = VD->getType()->castAs<RecordType>()->getDecl();
+        if (RD->isCompleteDefinition())
+          RewriteRecordBody(RD);
+      }
+      if (VD->getInit()) {
+        GlobalVarDecl = VD;
+        CurrentBody = VD->getInit();
+        RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
+        CurrentBody = nullptr;
+        if (PropParentMap) {
+          delete PropParentMap;
+          PropParentMap = nullptr;
+        }
+        SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(), VD->getName());
+        GlobalVarDecl = nullptr;
+
+        // This is needed for blocks.
+        if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
+            RewriteCastExpr(CE);
+        }
+      }
+      break;
+    }
+    case Decl::TypeAlias:
+    case Decl::Typedef: {
+      if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
+        if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+          RewriteBlockPointerDecl(TD);
+        else if (TD->getUnderlyingType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+        else
+          RewriteObjCQualifiedInterfaceTypes(TD);
+      }
+      break;
+    }
+    case Decl::CXXRecord:
+    case Decl::Record: {
+      RecordDecl *RD = cast<RecordDecl>(D);
+      if (RD->isCompleteDefinition())
+        RewriteRecordBody(RD);
+      break;
+    }
+    default:
+      break;
+  }
+  // Nothing yet.
+}
+
+/// Write_ProtocolExprReferencedMetadata - This routine writer out the
+/// protocol reference symbols in the for of:
+/// struct _protocol_t *PROTOCOL_REF = &PROTOCOL_METADATA.
+static void Write_ProtocolExprReferencedMetadata(ASTContext *Context,
+                                                 ObjCProtocolDecl *PDecl,
+                                                 std::string &Result) {
+  // Also output .objc_protorefs$B section and its meta-data.
+  if (Context->getLangOpts().MicrosoftExt)
+    Result += "static ";
+  Result += "struct _protocol_t *";
+  Result += "_OBJC_PROTOCOL_REFERENCE_$_";
+  Result += PDecl->getNameAsString();
+  Result += " = &";
+  Result += "_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
+  Result += ";\n";
+}
+
+void RewriteModernObjC::HandleTranslationUnit(ASTContext &C) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+  RewriteInclude();
+
+  for (unsigned i = 0, e = FunctionDefinitionsSeen.size(); i < e; i++) {
+    // translation of function bodies were postponed until all class and
+    // their extensions and implementations are seen. This is because, we
+    // cannot build grouping structs for bitfields until they are all seen.
+    FunctionDecl *FDecl = FunctionDefinitionsSeen[i];
+    HandleTopLevelSingleDecl(FDecl);
+  }
+
+  // Here's a great place to add any extra declarations that may be needed.
+  // Write out meta data for each @protocol(<expr>).
+  for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls) {
+    RewriteObjCProtocolMetaData(ProtDecl, Preamble);
+    Write_ProtocolExprReferencedMetadata(Context, ProtDecl, Preamble);
+  }
+
+  InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
+
+  if (ClassImplementation.size() || CategoryImplementation.size())
+    RewriteImplementations();
+
+  for (unsigned i = 0, e = ObjCInterfacesSeen.size(); i < e; i++) {
+    ObjCInterfaceDecl *CDecl = ObjCInterfacesSeen[i];
+    // Write struct declaration for the class matching its ivar declarations.
+    // Note that for modern abi, this is postponed until the end of TU
+    // because class extensions and the implementation might declare their own
+    // private ivars.
+    RewriteInterfaceDecl(CDecl);
+  }
+
+  // Get the buffer corresponding to MainFileID.  If we haven't changed it, then
+  // we are done.
+  if (const RewriteBuffer *RewriteBuf =
+      Rewrite.getRewriteBufferFor(MainFileID)) {
+    //printf("Changed:\n");
+    *OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
+  } else {
+    llvm::errs() << "No changes\n";
+  }
+
+  if (ClassImplementation.size() || CategoryImplementation.size() ||
+      ProtocolExprDecls.size()) {
+    // Rewrite Objective-c meta data*
+    std::string ResultStr;
+    RewriteMetaDataIntoBuffer(ResultStr);
+    // Emit metadata.
+    *OutFile << ResultStr;
+  }
+  // Emit ImageInfo;
+  {
+    std::string ResultStr;
+    WriteImageInfo(ResultStr);
+    *OutFile << ResultStr;
+  }
+  OutFile->flush();
+}
+
+void RewriteModernObjC::Initialize(ASTContext &context) {
+  InitializeCommon(context);
+
+  Preamble += "#ifndef __OBJC2__\n";
+  Preamble += "#define __OBJC2__\n";
+  Preamble += "#endif\n";
+
+  // declaring objc_selector outside the parameter list removes a silly
+  // scope related warning...
+  if (IsHeader)
+    Preamble = "#pragma once\n";
+  Preamble += "struct objc_selector; struct objc_class;\n";
+  Preamble += "struct __rw_objc_super { \n\tstruct objc_object *object; ";
+  Preamble += "\n\tstruct objc_object *superClass; ";
+  // Add a constructor for creating temporary objects.
+  Preamble += "\n\t__rw_objc_super(struct objc_object *o, struct objc_object *s) ";
+  Preamble += ": object(o), superClass(s) {} ";
+  Preamble += "\n};\n";
+
+  if (LangOpts.MicrosoftExt) {
+    // Define all sections using syntax that makes sense.
+    // These are currently generated.
+    Preamble += "\n#pragma section(\".objc_classlist$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_catlist$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_imageinfo$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_nlclslist$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_nlcatlist$B\", long, read, write)\n";
+    // These are generated but not necessary for functionality.
+    Preamble += "#pragma section(\".cat_cls_meth$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".inst_meth$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".cls_meth$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_ivar$B\", long, read, write)\n";
+
+    // These need be generated for performance. Currently they are not,
+    // using API calls instead.
+    Preamble += "#pragma section(\".objc_selrefs$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_classrefs$B\", long, read, write)\n";
+    Preamble += "#pragma section(\".objc_superrefs$B\", long, read, write)\n";
+
+  }
+  Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
+  Preamble += "typedef struct objc_object Protocol;\n";
+  Preamble += "#define _REWRITER_typedef_Protocol\n";
+  Preamble += "#endif\n";
+  if (LangOpts.MicrosoftExt) {
+    Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
+    Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
+  }
+  else
+    Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
+
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend(void);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper(void);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_stret(void);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper_stret(void);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_fpret(void);\n";
+
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getClass";
+  Preamble += "(const char *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
+  Preamble += "(struct objc_class *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getMetaClass";
+  Preamble += "(const char *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw( struct objc_object *);\n";
+  // @synchronized hooks.
+  Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter( struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit( struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
+  Preamble += "#ifdef _WIN64\n";
+  Preamble += "typedef unsigned long long  _WIN_NSUInteger;\n";
+  Preamble += "#else\n";
+  Preamble += "typedef unsigned int _WIN_NSUInteger;\n";
+  Preamble += "#endif\n";
+  Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
+  Preamble += "struct __objcFastEnumerationState {\n\t";
+  Preamble += "unsigned long state;\n\t";
+  Preamble += "void **itemsPtr;\n\t";
+  Preamble += "unsigned long *mutationsPtr;\n\t";
+  Preamble += "unsigned long extra[5];\n};\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
+  Preamble += "#define __FASTENUMERATIONSTATE\n";
+  Preamble += "#endif\n";
+  Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
+  Preamble += "struct __NSConstantStringImpl {\n";
+  Preamble += "  int *isa;\n";
+  Preamble += "  int flags;\n";
+  Preamble += "  char *str;\n";
+  Preamble += "#if _WIN64\n";
+  Preamble += "  long long length;\n";
+  Preamble += "#else\n";
+  Preamble += "  long length;\n";
+  Preamble += "#endif\n";
+  Preamble += "};\n";
+  Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
+  Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
+  Preamble += "#else\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
+  Preamble += "#endif\n";
+  Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
+  Preamble += "#endif\n";
+  // Blocks preamble.
+  Preamble += "#ifndef BLOCK_IMPL\n";
+  Preamble += "#define BLOCK_IMPL\n";
+  Preamble += "struct __block_impl {\n";
+  Preamble += "  void *isa;\n";
+  Preamble += "  int Flags;\n";
+  Preamble += "  int Reserved;\n";
+  Preamble += "  void *FuncPtr;\n";
+  Preamble += "};\n";
+  Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
+  Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
+  Preamble += "extern \"C\" __declspec(dllexport) "
+  "void _Block_object_assign(void *, const void *, const int);\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
+  Preamble += "#else\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
+  Preamble += "#endif\n";
+  Preamble += "#endif\n";
+  if (LangOpts.MicrosoftExt) {
+    Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
+    Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
+    Preamble += "#ifndef KEEP_ATTRIBUTES\n";  // We use this for clang tests.
+    Preamble += "#define __attribute__(X)\n";
+    Preamble += "#endif\n";
+    Preamble += "#ifndef __weak\n";
+    Preamble += "#define __weak\n";
+    Preamble += "#endif\n";
+    Preamble += "#ifndef __block\n";
+    Preamble += "#define __block\n";
+    Preamble += "#endif\n";
+  }
+  else {
+    Preamble += "#define __block\n";
+    Preamble += "#define __weak\n";
+  }
+
+  // Declarations required for modern objective-c array and dictionary literals.
+  Preamble += "\n#include <stdarg.h>\n";
+  Preamble += "struct __NSContainer_literal {\n";
+  Preamble += "  void * *arr;\n";
+  Preamble += "  __NSContainer_literal (unsigned int count, ...) {\n";
+  Preamble += "\tva_list marker;\n";
+  Preamble += "\tva_start(marker, count);\n";
+  Preamble += "\tarr = new void *[count];\n";
+  Preamble += "\tfor (unsigned i = 0; i < count; i++)\n";
+  Preamble += "\t  arr[i] = va_arg(marker, void *);\n";
+  Preamble += "\tva_end( marker );\n";
+  Preamble += "  };\n";
+  Preamble += "  ~__NSContainer_literal() {\n";
+  Preamble += "\tdelete[] arr;\n";
+  Preamble += "  }\n";
+  Preamble += "};\n";
+
+  // Declaration required for implementation of @autoreleasepool statement.
+  Preamble += "extern \"C\" __declspec(dllimport) void * objc_autoreleasePoolPush(void);\n";
+  Preamble += "extern \"C\" __declspec(dllimport) void objc_autoreleasePoolPop(void *);\n\n";
+  Preamble += "struct __AtAutoreleasePool {\n";
+  Preamble += "  __AtAutoreleasePool() {atautoreleasepoolobj = objc_autoreleasePoolPush();}\n";
+  Preamble += "  ~__AtAutoreleasePool() {objc_autoreleasePoolPop(atautoreleasepoolobj);}\n";
+  Preamble += "  void * atautoreleasepoolobj;\n";
+  Preamble += "};\n";
+
+  // NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
+  // as this avoids warning in any 64bit/32bit compilation model.
+  Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
+}
+
+/// RewriteIvarOffsetComputation - This routine synthesizes computation of
+/// ivar offset.
+void RewriteModernObjC::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                                         std::string &Result) {
+  Result += "__OFFSETOFIVAR__(struct ";
+  Result += ivar->getContainingInterface()->getNameAsString();
+  if (LangOpts.MicrosoftExt)
+    Result += "_IMPL";
+  Result += ", ";
+  if (ivar->isBitField())
+    ObjCIvarBitfieldGroupDecl(ivar, Result);
+  else
+    Result += ivar->getNameAsString();
+  Result += ")";
+}
+
+/// WriteModernMetadataDeclarations - Writes out metadata declarations for modern ABI.
+/// struct _prop_t {
+///   const char *name;
+///   char *attributes;
+/// }
+
+/// struct _prop_list_t {
+///   uint32_t entsize;      // sizeof(struct _prop_t)
+///   uint32_t count_of_properties;
+///   struct _prop_t prop_list[count_of_properties];
+/// }
+
+/// struct _protocol_t;
+
+/// struct _protocol_list_t {
+///   long protocol_count;   // Note, this is 32/64 bit
+///   struct _protocol_t * protocol_list[protocol_count];
+/// }
+
+/// struct _objc_method {
+///   SEL _cmd;
+///   const char *method_type;
+///   char *_imp;
+/// }
+
+/// struct _method_list_t {
+///   uint32_t entsize;  // sizeof(struct _objc_method)
+///   uint32_t method_count;
+///   struct _objc_method method_list[method_count];
+/// }
+
+/// struct _protocol_t {
+///   id isa;  // NULL
+///   const char *protocol_name;
+///   const struct _protocol_list_t * protocol_list; // super protocols
+///   const struct method_list_t *instance_methods;
+///   const struct method_list_t *class_methods;
+///   const struct method_list_t *optionalInstanceMethods;
+///   const struct method_list_t *optionalClassMethods;
+///   const struct _prop_list_t * properties;
+///   const uint32_t size;  // sizeof(struct _protocol_t)
+///   const uint32_t flags;  // = 0
+///   const char ** extendedMethodTypes;
+/// }
+
+/// struct _ivar_t {
+///   unsigned long int *offset;  // pointer to ivar offset location
+///   const char *name;
+///   const char *type;
+///   uint32_t alignment;
+///   uint32_t size;
+/// }
+
+/// struct _ivar_list_t {
+///   uint32 entsize;  // sizeof(struct _ivar_t)
+///   uint32 count;
+///   struct _ivar_t list[count];
+/// }
+
+/// struct _class_ro_t {
+///   uint32_t flags;
+///   uint32_t instanceStart;
+///   uint32_t instanceSize;
+///   uint32_t reserved;  // only when building for 64bit targets
+///   const uint8_t *ivarLayout;
+///   const char *name;
+///   const struct _method_list_t *baseMethods;
+///   const struct _protocol_list_t *baseProtocols;
+///   const struct _ivar_list_t *ivars;
+///   const uint8_t *weakIvarLayout;
+///   const struct _prop_list_t *properties;
+/// }
+
+/// struct _class_t {
+///   struct _class_t *isa;
+///   struct _class_t *superclass;
+///   void *cache;
+///   IMP *vtable;
+///   struct _class_ro_t *ro;
+/// }
+
+/// struct _category_t {
+///   const char *name;
+///   struct _class_t *cls;
+///   const struct _method_list_t *instance_methods;
+///   const struct _method_list_t *class_methods;
+///   const struct _protocol_list_t *protocols;
+///   const struct _prop_list_t *properties;
+/// }
+
+/// MessageRefTy - LLVM for:
+/// struct _message_ref_t {
+///   IMP messenger;
+///   SEL name;
+/// };
+
+/// SuperMessageRefTy - LLVM for:
+/// struct _super_message_ref_t {
+///   SUPER_IMP messenger;
+///   SEL name;
+/// };
+
+static void WriteModernMetadataDeclarations(ASTContext *Context, std::string &Result) {
+  static bool meta_data_declared = false;
+  if (meta_data_declared)
+    return;
+
+  Result += "\nstruct _prop_t {\n";
+  Result += "\tconst char *name;\n";
+  Result += "\tconst char *attributes;\n";
+  Result += "};\n";
+
+  Result += "\nstruct _protocol_t;\n";
+
+  Result += "\nstruct _objc_method {\n";
+  Result += "\tstruct objc_selector * _cmd;\n";
+  Result += "\tconst char *method_type;\n";
+  Result += "\tvoid  *_imp;\n";
+  Result += "};\n";
+
+  Result += "\nstruct _protocol_t {\n";
+  Result += "\tvoid * isa;  // NULL\n";
+  Result += "\tconst char *protocol_name;\n";
+  Result += "\tconst struct _protocol_list_t * protocol_list; // super protocols\n";
+  Result += "\tconst struct method_list_t *instance_methods;\n";
+  Result += "\tconst struct method_list_t *class_methods;\n";
+  Result += "\tconst struct method_list_t *optionalInstanceMethods;\n";
+  Result += "\tconst struct method_list_t *optionalClassMethods;\n";
+  Result += "\tconst struct _prop_list_t * properties;\n";
+  Result += "\tconst unsigned int size;  // sizeof(struct _protocol_t)\n";
+  Result += "\tconst unsigned int flags;  // = 0\n";
+  Result += "\tconst char ** extendedMethodTypes;\n";
+  Result += "};\n";
+
+  Result += "\nstruct _ivar_t {\n";
+  Result += "\tunsigned long int *offset;  // pointer to ivar offset location\n";
+  Result += "\tconst char *name;\n";
+  Result += "\tconst char *type;\n";
+  Result += "\tunsigned int alignment;\n";
+  Result += "\tunsigned int  size;\n";
+  Result += "};\n";
+
+  Result += "\nstruct _class_ro_t {\n";
+  Result += "\tunsigned int flags;\n";
+  Result += "\tunsigned int instanceStart;\n";
+  Result += "\tunsigned int instanceSize;\n";
+  const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
+  if (Triple.getArch() == llvm::Triple::x86_64)
+    Result += "\tunsigned int reserved;\n";
+  Result += "\tconst unsigned char *ivarLayout;\n";
+  Result += "\tconst char *name;\n";
+  Result += "\tconst struct _method_list_t *baseMethods;\n";
+  Result += "\tconst struct _objc_protocol_list *baseProtocols;\n";
+  Result += "\tconst struct _ivar_list_t *ivars;\n";
+  Result += "\tconst unsigned char *weakIvarLayout;\n";
+  Result += "\tconst struct _prop_list_t *properties;\n";
+  Result += "};\n";
+
+  Result += "\nstruct _class_t {\n";
+  Result += "\tstruct _class_t *isa;\n";
+  Result += "\tstruct _class_t *superclass;\n";
+  Result += "\tvoid *cache;\n";
+  Result += "\tvoid *vtable;\n";
+  Result += "\tstruct _class_ro_t *ro;\n";
+  Result += "};\n";
+
+  Result += "\nstruct _category_t {\n";
+  Result += "\tconst char *name;\n";
+  Result += "\tstruct _class_t *cls;\n";
+  Result += "\tconst struct _method_list_t *instance_methods;\n";
+  Result += "\tconst struct _method_list_t *class_methods;\n";
+  Result += "\tconst struct _protocol_list_t *protocols;\n";
+  Result += "\tconst struct _prop_list_t *properties;\n";
+  Result += "};\n";
+
+  Result += "extern \"C\" __declspec(dllimport) struct objc_cache _objc_empty_cache;\n";
+  Result += "#pragma warning(disable:4273)\n";
+  meta_data_declared = true;
+}
+
+static void Write_protocol_list_t_TypeDecl(std::string &Result,
+                                           long super_protocol_count) {
+  Result += "struct /*_protocol_list_t*/"; Result += " {\n";
+  Result += "\tlong protocol_count;  // Note, this is 32/64 bit\n";
+  Result += "\tstruct _protocol_t *super_protocols[";
+  Result += utostr(super_protocol_count); Result += "];\n";
+  Result += "}";
+}
+
+static void Write_method_list_t_TypeDecl(std::string &Result,
+                                         unsigned int method_count) {
+  Result += "struct /*_method_list_t*/"; Result += " {\n";
+  Result += "\tunsigned int entsize;  // sizeof(struct _objc_method)\n";
+  Result += "\tunsigned int method_count;\n";
+  Result += "\tstruct _objc_method method_list[";
+  Result += utostr(method_count); Result += "];\n";
+  Result += "}";
+}
+
+static void Write__prop_list_t_TypeDecl(std::string &Result,
+                                        unsigned int property_count) {
+  Result += "struct /*_prop_list_t*/"; Result += " {\n";
+  Result += "\tunsigned int entsize;  // sizeof(struct _prop_t)\n";
+  Result += "\tunsigned int count_of_properties;\n";
+  Result += "\tstruct _prop_t prop_list[";
+  Result += utostr(property_count); Result += "];\n";
+  Result += "}";
+}
+
+static void Write__ivar_list_t_TypeDecl(std::string &Result,
+                                        unsigned int ivar_count) {
+  Result += "struct /*_ivar_list_t*/"; Result += " {\n";
+  Result += "\tunsigned int entsize;  // sizeof(struct _prop_t)\n";
+  Result += "\tunsigned int count;\n";
+  Result += "\tstruct _ivar_t ivar_list[";
+  Result += utostr(ivar_count); Result += "];\n";
+  Result += "}";
+}
+
+static void Write_protocol_list_initializer(ASTContext *Context, std::string &Result,
+                                            ArrayRef<ObjCProtocolDecl *> SuperProtocols,
+                                            StringRef VarName,
+                                            StringRef ProtocolName) {
+  if (SuperProtocols.size() > 0) {
+    Result += "\nstatic ";
+    Write_protocol_list_t_TypeDecl(Result, SuperProtocols.size());
+    Result += " "; Result += VarName;
+    Result += ProtocolName;
+    Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
+    Result += "\t"; Result += utostr(SuperProtocols.size()); Result += ",\n";
+    for (unsigned i = 0, e = SuperProtocols.size(); i < e; i++) {
+      ObjCProtocolDecl *SuperPD = SuperProtocols[i];
+      Result += "\t&"; Result += "_OBJC_PROTOCOL_";
+      Result += SuperPD->getNameAsString();
+      if (i == e-1)
+        Result += "\n};\n";
+      else
+        Result += ",\n";
+    }
+  }
+}
+
+static void Write_method_list_t_initializer(RewriteModernObjC &RewriteObj,
+                                            ASTContext *Context, std::string &Result,
+                                            ArrayRef<ObjCMethodDecl *> Methods,
+                                            StringRef VarName,
+                                            StringRef TopLevelDeclName,
+                                            bool MethodImpl) {
+  if (Methods.size() > 0) {
+    Result += "\nstatic ";
+    Write_method_list_t_TypeDecl(Result, Methods.size());
+    Result += " "; Result += VarName;
+    Result += TopLevelDeclName;
+    Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
+    Result += "\t"; Result += "sizeof(_objc_method)"; Result += ",\n";
+    Result += "\t"; Result += utostr(Methods.size()); Result += ",\n";
+    for (unsigned i = 0, e = Methods.size(); i < e; i++) {
+      ObjCMethodDecl *MD = Methods[i];
+      if (i == 0)
+        Result += "\t{{(struct objc_selector *)\"";
+      else
+        Result += "\t{(struct objc_selector *)\"";
+      Result += (MD)->getSelector().getAsString(); Result += "\"";
+      Result += ", ";
+      std::string MethodTypeString = Context->getObjCEncodingForMethodDecl(MD);
+      Result += "\""; Result += MethodTypeString; Result += "\"";
+      Result += ", ";
+      if (!MethodImpl)
+        Result += "0";
+      else {
+        Result += "(void *)";
+        Result += RewriteObj.MethodInternalNames[MD];
+      }
+      if (i  == e-1)
+        Result += "}}\n";
+      else
+        Result += "},\n";
+    }
+    Result += "};\n";
+  }
+}
+
+static void Write_prop_list_t_initializer(RewriteModernObjC &RewriteObj,
+                                           ASTContext *Context, std::string &Result,
+                                           ArrayRef<ObjCPropertyDecl *> Properties,
+                                           const Decl *Container,
+                                           StringRef VarName,
+                                           StringRef ProtocolName) {
+  if (Properties.size() > 0) {
+    Result += "\nstatic ";
+    Write__prop_list_t_TypeDecl(Result, Properties.size());
+    Result += " "; Result += VarName;
+    Result += ProtocolName;
+    Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
+    Result += "\t"; Result += "sizeof(_prop_t)"; Result += ",\n";
+    Result += "\t"; Result += utostr(Properties.size()); Result += ",\n";
+    for (unsigned i = 0, e = Properties.size(); i < e; i++) {
+      ObjCPropertyDecl *PropDecl = Properties[i];
+      if (i == 0)
+        Result += "\t{{\"";
+      else
+        Result += "\t{\"";
+      Result += PropDecl->getName(); Result += "\",";
+      std::string PropertyTypeString =
+        Context->getObjCEncodingForPropertyDecl(PropDecl, Container);
+      std::string QuotePropertyTypeString;
+      RewriteObj.QuoteDoublequotes(PropertyTypeString, QuotePropertyTypeString);
+      Result += "\""; Result += QuotePropertyTypeString; Result += "\"";
+      if (i  == e-1)
+        Result += "}}\n";
+      else
+        Result += "},\n";
+    }
+    Result += "};\n";
+  }
+}
+
+// Metadata flags
+enum MetaDataDlags {
+  CLS = 0x0,
+  CLS_META = 0x1,
+  CLS_ROOT = 0x2,
+  OBJC2_CLS_HIDDEN = 0x10,
+  CLS_EXCEPTION = 0x20,
+
+  /// (Obsolete) ARC-specific: this class has a .release_ivars method
+  CLS_HAS_IVAR_RELEASER = 0x40,
+  /// class was compiled with -fobjc-arr
+  CLS_COMPILED_BY_ARC = 0x80  // (1<<7)
+};
+
+static void Write__class_ro_t_initializer(ASTContext *Context, std::string &Result,
+                                          unsigned int flags,
+                                          const std::string &InstanceStart,
+                                          const std::string &InstanceSize,
+                                          ArrayRef<ObjCMethodDecl *>baseMethods,
+                                          ArrayRef<ObjCProtocolDecl *>baseProtocols,
+                                          ArrayRef<ObjCIvarDecl *>ivars,
+                                          ArrayRef<ObjCPropertyDecl *>Properties,
+                                          StringRef VarName,
+                                          StringRef ClassName) {
+  Result += "\nstatic struct _class_ro_t ";
+  Result += VarName; Result += ClassName;
+  Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
+  Result += "\t";
+  Result += llvm::utostr(flags); Result += ", ";
+  Result += InstanceStart; Result += ", ";
+  Result += InstanceSize; Result += ", \n";
+  Result += "\t";
+  const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
+  if (Triple.getArch() == llvm::Triple::x86_64)
+    // uint32_t const reserved; // only when building for 64bit targets
+    Result += "(unsigned int)0, \n\t";
+  // const uint8_t * const ivarLayout;
+  Result += "0, \n\t";
+  Result += "\""; Result += ClassName; Result += "\",\n\t";
+  bool metaclass = ((flags & CLS_META) != 0);
+  if (baseMethods.size() > 0) {
+    Result += "(const struct _method_list_t *)&";
+    if (metaclass)
+      Result += "_OBJC_$_CLASS_METHODS_";
+    else
+      Result += "_OBJC_$_INSTANCE_METHODS_";
+    Result += ClassName;
+    Result += ",\n\t";
+  }
+  else
+    Result += "0, \n\t";
+
+  if (!metaclass && baseProtocols.size() > 0) {
+    Result += "(const struct _objc_protocol_list *)&";
+    Result += "_OBJC_CLASS_PROTOCOLS_$_"; Result += ClassName;
+    Result += ",\n\t";
+  }
+  else
+    Result += "0, \n\t";
+
+  if (!metaclass && ivars.size() > 0) {
+    Result += "(const struct _ivar_list_t *)&";
+    Result += "_OBJC_$_INSTANCE_VARIABLES_"; Result += ClassName;
+    Result += ",\n\t";
+  }
+  else
+    Result += "0, \n\t";
+
+  // weakIvarLayout
+  Result += "0, \n\t";
+  if (!metaclass && Properties.size() > 0) {
+    Result += "(const struct _prop_list_t *)&";
+    Result += "_OBJC_$_PROP_LIST_"; Result += ClassName;
+    Result += ",\n";
+  }
+  else
+    Result += "0, \n";
+
+  Result += "};\n";
+}
+
+static void Write_class_t(ASTContext *Context, std::string &Result,
+                          StringRef VarName,
+                          const ObjCInterfaceDecl *CDecl, bool metaclass) {
+  bool rootClass = (!CDecl->getSuperClass());
+  const ObjCInterfaceDecl *RootClass = CDecl;
+
+  if (!rootClass) {
+    // Find the Root class
+    RootClass = CDecl->getSuperClass();
+    while (RootClass->getSuperClass()) {
+      RootClass = RootClass->getSuperClass();
+    }
+  }
+
+  if (metaclass && rootClass) {
+    // Need to handle a case of use of forward declaration.
+    Result += "\n";
+    Result += "extern \"C\" ";
+    if (CDecl->getImplementation())
+      Result += "__declspec(dllexport) ";
+    else
+      Result += "__declspec(dllimport) ";
+
+    Result += "struct _class_t OBJC_CLASS_$_";
+    Result += CDecl->getNameAsString();
+    Result += ";\n";
+  }
+  // Also, for possibility of 'super' metadata class not having been defined yet.
+  if (!rootClass) {
+    ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
+    Result += "\n";
+    Result += "extern \"C\" ";
+    if (SuperClass->getImplementation())
+      Result += "__declspec(dllexport) ";
+    else
+      Result += "__declspec(dllimport) ";
+
+    Result += "struct _class_t ";
+    Result += VarName;
+    Result += SuperClass->getNameAsString();
+    Result += ";\n";
+
+    if (metaclass && RootClass != SuperClass) {
+      Result += "extern \"C\" ";
+      if (RootClass->getImplementation())
+        Result += "__declspec(dllexport) ";
+      else
+        Result += "__declspec(dllimport) ";
+
+      Result += "struct _class_t ";
+      Result += VarName;
+      Result += RootClass->getNameAsString();
+      Result += ";\n";
+    }
+  }
+
+  Result += "\nextern \"C\" __declspec(dllexport) struct _class_t ";
+  Result += VarName; Result += CDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__DATA,__objc_data\"))) = {\n";
+  Result += "\t";
+  if (metaclass) {
+    if (!rootClass) {
+      Result += "0, // &"; Result += VarName;
+      Result += RootClass->getNameAsString();
+      Result += ",\n\t";
+      Result += "0, // &"; Result += VarName;
+      Result += CDecl->getSuperClass()->getNameAsString();
+      Result += ",\n\t";
+    }
+    else {
+      Result += "0, // &"; Result += VarName;
+      Result += CDecl->getNameAsString();
+      Result += ",\n\t";
+      Result += "0, // &OBJC_CLASS_$_"; Result += CDecl->getNameAsString();
+      Result += ",\n\t";
+    }
+  }
+  else {
+    Result += "0, // &OBJC_METACLASS_$_";
+    Result += CDecl->getNameAsString();
+    Result += ",\n\t";
+    if (!rootClass) {
+      Result += "0, // &"; Result += VarName;
+      Result += CDecl->getSuperClass()->getNameAsString();
+      Result += ",\n\t";
+    }
+    else
+      Result += "0,\n\t";
+  }
+  Result += "0, // (void *)&_objc_empty_cache,\n\t";
+  Result += "0, // unused, was (void *)&_objc_empty_vtable,\n\t";
+  if (metaclass)
+    Result += "&_OBJC_METACLASS_RO_$_";
+  else
+    Result += "&_OBJC_CLASS_RO_$_";
+  Result += CDecl->getNameAsString();
+  Result += ",\n};\n";
+
+  // Add static function to initialize some of the meta-data fields.
+  // avoid doing it twice.
+  if (metaclass)
+    return;
+
+  const ObjCInterfaceDecl *SuperClass =
+    rootClass ? CDecl : CDecl->getSuperClass();
+
+  Result += "static void OBJC_CLASS_SETUP_$_";
+  Result += CDecl->getNameAsString();
+  Result += "(void ) {\n";
+  Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
+  Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
+  Result += RootClass->getNameAsString(); Result += ";\n";
+
+  Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
+  Result += ".superclass = ";
+  if (rootClass)
+    Result += "&OBJC_CLASS_$_";
+  else
+     Result += "&OBJC_METACLASS_$_";
+
+  Result += SuperClass->getNameAsString(); Result += ";\n";
+
+  Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
+  Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
+
+  Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
+  Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
+  Result += CDecl->getNameAsString(); Result += ";\n";
+
+  if (!rootClass) {
+    Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
+    Result += ".superclass = "; Result += "&OBJC_CLASS_$_";
+    Result += SuperClass->getNameAsString(); Result += ";\n";
+  }
+
+  Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
+  Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
+  Result += "}\n";
+}
+
+static void Write_category_t(RewriteModernObjC &RewriteObj, ASTContext *Context,
+                             std::string &Result,
+                             ObjCCategoryDecl *CatDecl,
+                             ObjCInterfaceDecl *ClassDecl,
+                             ArrayRef<ObjCMethodDecl *> InstanceMethods,
+                             ArrayRef<ObjCMethodDecl *> ClassMethods,
+                             ArrayRef<ObjCProtocolDecl *> RefedProtocols,
+                             ArrayRef<ObjCPropertyDecl *> ClassProperties) {
+  StringRef CatName = CatDecl->getName();
+  StringRef ClassName = ClassDecl->getName();
+  // must declare an extern class object in case this class is not implemented
+  // in this TU.
+  Result += "\n";
+  Result += "extern \"C\" ";
+  if (ClassDecl->getImplementation())
+    Result += "__declspec(dllexport) ";
+  else
+    Result += "__declspec(dllimport) ";
+
+  Result += "struct _class_t ";
+  Result += "OBJC_CLASS_$_"; Result += ClassName;
+  Result += ";\n";
+
+  Result += "\nstatic struct _category_t ";
+  Result += "_OBJC_$_CATEGORY_";
+  Result += ClassName; Result += "_$_"; Result += CatName;
+  Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
+  Result += "{\n";
+  Result += "\t\""; Result += ClassName; Result += "\",\n";
+  Result += "\t0, // &"; Result += "OBJC_CLASS_$_"; Result += ClassName;
+  Result += ",\n";
+  if (InstanceMethods.size() > 0) {
+    Result += "\t(const struct _method_list_t *)&";
+    Result += "_OBJC_$_CATEGORY_INSTANCE_METHODS_";
+    Result += ClassName; Result += "_$_"; Result += CatName;
+    Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (ClassMethods.size() > 0) {
+    Result += "\t(const struct _method_list_t *)&";
+    Result += "_OBJC_$_CATEGORY_CLASS_METHODS_";
+    Result += ClassName; Result += "_$_"; Result += CatName;
+    Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (RefedProtocols.size() > 0) {
+    Result += "\t(const struct _protocol_list_t *)&";
+    Result += "_OBJC_CATEGORY_PROTOCOLS_$_";
+    Result += ClassName; Result += "_$_"; Result += CatName;
+    Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (ClassProperties.size() > 0) {
+    Result += "\t(const struct _prop_list_t *)&";  Result += "_OBJC_$_PROP_LIST_";
+    Result += ClassName; Result += "_$_"; Result += CatName;
+    Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  Result += "};\n";
+
+  // Add static function to initialize the class pointer in the category structure.
+  Result += "static void OBJC_CATEGORY_SETUP_$_";
+  Result += ClassDecl->getNameAsString();
+  Result += "_$_";
+  Result += CatName;
+  Result += "(void ) {\n";
+  Result += "\t_OBJC_$_CATEGORY_";
+  Result += ClassDecl->getNameAsString();
+  Result += "_$_";
+  Result += CatName;
+  Result += ".cls = "; Result += "&OBJC_CLASS_$_"; Result += ClassName;
+  Result += ";\n}\n";
+}
+
+static void Write__extendedMethodTypes_initializer(RewriteModernObjC &RewriteObj,
+                                           ASTContext *Context, std::string &Result,
+                                           ArrayRef<ObjCMethodDecl *> Methods,
+                                           StringRef VarName,
+                                           StringRef ProtocolName) {
+  if (Methods.size() == 0)
+    return;
+
+  Result += "\nstatic const char *";
+  Result += VarName; Result += ProtocolName;
+  Result += " [] __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
+  Result += "{\n";
+  for (unsigned i = 0, e = Methods.size(); i < e; i++) {
+    ObjCMethodDecl *MD = Methods[i];
+    std::string MethodTypeString =
+      Context->getObjCEncodingForMethodDecl(MD, true);
+    std::string QuoteMethodTypeString;
+    RewriteObj.QuoteDoublequotes(MethodTypeString, QuoteMethodTypeString);
+    Result += "\t\""; Result += QuoteMethodTypeString; Result += "\"";
+    if (i == e-1)
+      Result += "\n};\n";
+    else {
+      Result += ",\n";
+    }
+  }
+}
+
+static void Write_IvarOffsetVar(RewriteModernObjC &RewriteObj,
+                                ASTContext *Context,
+                                std::string &Result,
+                                ArrayRef<ObjCIvarDecl *> Ivars,
+                                ObjCInterfaceDecl *CDecl) {
+  // FIXME. visibilty of offset symbols may have to be set; for Darwin
+  // this is what happens:
+  /**
+   if (Ivar->getAccessControl() == ObjCIvarDecl::Private ||
+       Ivar->getAccessControl() == ObjCIvarDecl::Package ||
+       Class->getVisibility() == HiddenVisibility)
+     Visibility should be: HiddenVisibility;
+   else
+     Visibility should be: DefaultVisibility;
+  */
+
+  Result += "\n";
+  for (unsigned i =0, e = Ivars.size(); i < e; i++) {
+    ObjCIvarDecl *IvarDecl = Ivars[i];
+    if (Context->getLangOpts().MicrosoftExt)
+      Result += "__declspec(allocate(\".objc_ivar$B\")) ";
+
+    if (!Context->getLangOpts().MicrosoftExt ||
+        IvarDecl->getAccessControl() == ObjCIvarDecl::Private ||
+        IvarDecl->getAccessControl() == ObjCIvarDecl::Package)
+      Result += "extern \"C\" unsigned long int ";
+    else
+      Result += "extern \"C\" __declspec(dllexport) unsigned long int ";
+    if (Ivars[i]->isBitField())
+      RewriteObj.ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
+    else
+      WriteInternalIvarName(CDecl, IvarDecl, Result);
+    Result += " __attribute__ ((used, section (\"__DATA,__objc_ivar\")))";
+    Result += " = ";
+    RewriteObj.RewriteIvarOffsetComputation(IvarDecl, Result);
+    Result += ";\n";
+    if (Ivars[i]->isBitField()) {
+      // skip over rest of the ivar bitfields.
+      SKIP_BITFIELDS(i , e, Ivars);
+    }
+  }
+}
+
+static void Write__ivar_list_t_initializer(RewriteModernObjC &RewriteObj,
+                                           ASTContext *Context, std::string &Result,
+                                           ArrayRef<ObjCIvarDecl *> OriginalIvars,
+                                           StringRef VarName,
+                                           ObjCInterfaceDecl *CDecl) {
+  if (OriginalIvars.size() > 0) {
+    Write_IvarOffsetVar(RewriteObj, Context, Result, OriginalIvars, CDecl);
+    SmallVector<ObjCIvarDecl *, 8> Ivars;
+    // strip off all but the first ivar bitfield from each group of ivars.
+    // Such ivars in the ivar list table will be replaced by their grouping struct
+    // 'ivar'.
+    for (unsigned i = 0, e = OriginalIvars.size(); i < e; i++) {
+      if (OriginalIvars[i]->isBitField()) {
+        Ivars.push_back(OriginalIvars[i]);
+        // skip over rest of the ivar bitfields.
+        SKIP_BITFIELDS(i , e, OriginalIvars);
+      }
+      else
+        Ivars.push_back(OriginalIvars[i]);
+    }
+
+    Result += "\nstatic ";
+    Write__ivar_list_t_TypeDecl(Result, Ivars.size());
+    Result += " "; Result += VarName;
+    Result += CDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
+    Result += "\t"; Result += "sizeof(_ivar_t)"; Result += ",\n";
+    Result += "\t"; Result += utostr(Ivars.size()); Result += ",\n";
+    for (unsigned i =0, e = Ivars.size(); i < e; i++) {
+      ObjCIvarDecl *IvarDecl = Ivars[i];
+      if (i == 0)
+        Result += "\t{{";
+      else
+        Result += "\t {";
+      Result += "(unsigned long int *)&";
+      if (Ivars[i]->isBitField())
+        RewriteObj.ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
+      else
+        WriteInternalIvarName(CDecl, IvarDecl, Result);
+      Result += ", ";
+
+      Result += "\"";
+      if (Ivars[i]->isBitField())
+        RewriteObj.ObjCIvarBitfieldGroupDecl(Ivars[i], Result);
+      else
+        Result += IvarDecl->getName();
+      Result += "\", ";
+
+      QualType IVQT = IvarDecl->getType();
+      if (IvarDecl->isBitField())
+        IVQT = RewriteObj.GetGroupRecordTypeForObjCIvarBitfield(IvarDecl);
+
+      std::string IvarTypeString, QuoteIvarTypeString;
+      Context->getObjCEncodingForType(IVQT, IvarTypeString,
+                                      IvarDecl);
+      RewriteObj.QuoteDoublequotes(IvarTypeString, QuoteIvarTypeString);
+      Result += "\""; Result += QuoteIvarTypeString; Result += "\", ";
+
+      // FIXME. this alignment represents the host alignment and need be changed to
+      // represent the target alignment.
+      unsigned Align = Context->getTypeAlign(IVQT)/8;
+      Align = llvm::Log2_32(Align);
+      Result += llvm::utostr(Align); Result += ", ";
+      CharUnits Size = Context->getTypeSizeInChars(IVQT);
+      Result += llvm::utostr(Size.getQuantity());
+      if (i  == e-1)
+        Result += "}}\n";
+      else
+        Result += "},\n";
+    }
+    Result += "};\n";
+  }
+}
+
+/// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
+void RewriteModernObjC::RewriteObjCProtocolMetaData(ObjCProtocolDecl *PDecl,
+                                                    std::string &Result) {
+
+  // Do not synthesize the protocol more than once.
+  if (ObjCSynthesizedProtocols.count(PDecl->getCanonicalDecl()))
+    return;
+  WriteModernMetadataDeclarations(Context, Result);
+
+  if (ObjCProtocolDecl *Def = PDecl->getDefinition())
+    PDecl = Def;
+  // Must write out all protocol definitions in current qualifier list,
+  // and in their nested qualifiers before writing out current definition.
+  for (auto *I : PDecl->protocols())
+    RewriteObjCProtocolMetaData(I, Result);
+
+  // Construct method lists.
+  std::vector<ObjCMethodDecl *> InstanceMethods, ClassMethods;
+  std::vector<ObjCMethodDecl *> OptInstanceMethods, OptClassMethods;
+  for (auto *MD : PDecl->instance_methods()) {
+    if (MD->getImplementationControl() == ObjCMethodDecl::Optional) {
+      OptInstanceMethods.push_back(MD);
+    } else {
+      InstanceMethods.push_back(MD);
+    }
+  }
+
+  for (auto *MD : PDecl->class_methods()) {
+    if (MD->getImplementationControl() == ObjCMethodDecl::Optional) {
+      OptClassMethods.push_back(MD);
+    } else {
+      ClassMethods.push_back(MD);
+    }
+  }
+  std::vector<ObjCMethodDecl *> AllMethods;
+  for (unsigned i = 0, e = InstanceMethods.size(); i < e; i++)
+    AllMethods.push_back(InstanceMethods[i]);
+  for (unsigned i = 0, e = ClassMethods.size(); i < e; i++)
+    AllMethods.push_back(ClassMethods[i]);
+  for (unsigned i = 0, e = OptInstanceMethods.size(); i < e; i++)
+    AllMethods.push_back(OptInstanceMethods[i]);
+  for (unsigned i = 0, e = OptClassMethods.size(); i < e; i++)
+    AllMethods.push_back(OptClassMethods[i]);
+
+  Write__extendedMethodTypes_initializer(*this, Context, Result,
+                                         AllMethods,
+                                         "_OBJC_PROTOCOL_METHOD_TYPES_",
+                                         PDecl->getNameAsString());
+  // Protocol's super protocol list
+  SmallVector<ObjCProtocolDecl *, 8> SuperProtocols(PDecl->protocols());
+  Write_protocol_list_initializer(Context, Result, SuperProtocols,
+                                  "_OBJC_PROTOCOL_REFS_",
+                                  PDecl->getNameAsString());
+
+  Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
+                                  "_OBJC_PROTOCOL_INSTANCE_METHODS_",
+                                  PDecl->getNameAsString(), false);
+
+  Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
+                                  "_OBJC_PROTOCOL_CLASS_METHODS_",
+                                  PDecl->getNameAsString(), false);
+
+  Write_method_list_t_initializer(*this, Context, Result, OptInstanceMethods,
+                                  "_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_",
+                                  PDecl->getNameAsString(), false);
+
+  Write_method_list_t_initializer(*this, Context, Result, OptClassMethods,
+                                  "_OBJC_PROTOCOL_OPT_CLASS_METHODS_",
+                                  PDecl->getNameAsString(), false);
+
+  // Protocol's property metadata.
+  SmallVector<ObjCPropertyDecl *, 8> ProtocolProperties(
+      PDecl->instance_properties());
+  Write_prop_list_t_initializer(*this, Context, Result, ProtocolProperties,
+                                 /* Container */nullptr,
+                                 "_OBJC_PROTOCOL_PROPERTIES_",
+                                 PDecl->getNameAsString());
+
+  // Writer out root metadata for current protocol: struct _protocol_t
+  Result += "\n";
+  if (LangOpts.MicrosoftExt)
+    Result += "static ";
+  Result += "struct _protocol_t _OBJC_PROTOCOL_";
+  Result += PDecl->getNameAsString();
+  Result += " __attribute__ ((used)) = {\n";
+  Result += "\t0,\n"; // id is; is null
+  Result += "\t\""; Result += PDecl->getNameAsString(); Result += "\",\n";
+  if (SuperProtocols.size() > 0) {
+    Result += "\t(const struct _protocol_list_t *)&"; Result += "_OBJC_PROTOCOL_REFS_";
+    Result += PDecl->getNameAsString(); Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+  if (InstanceMethods.size() > 0) {
+    Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
+    Result += PDecl->getNameAsString(); Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (ClassMethods.size() > 0) {
+    Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_CLASS_METHODS_";
+    Result += PDecl->getNameAsString(); Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (OptInstanceMethods.size() > 0) {
+    Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_";
+    Result += PDecl->getNameAsString(); Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (OptClassMethods.size() > 0) {
+    Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_CLASS_METHODS_";
+    Result += PDecl->getNameAsString(); Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  if (ProtocolProperties.size() > 0) {
+    Result += "\t(const struct _prop_list_t *)&_OBJC_PROTOCOL_PROPERTIES_";
+    Result += PDecl->getNameAsString(); Result += ",\n";
+  }
+  else
+    Result += "\t0,\n";
+
+  Result += "\t"; Result += "sizeof(_protocol_t)"; Result += ",\n";
+  Result += "\t0,\n";
+
+  if (AllMethods.size() > 0) {
+    Result += "\t(const char **)&"; Result += "_OBJC_PROTOCOL_METHOD_TYPES_";
+    Result += PDecl->getNameAsString();
+    Result += "\n};\n";
+  }
+  else
+    Result += "\t0\n};\n";
+
+  if (LangOpts.MicrosoftExt)
+    Result += "static ";
+  Result += "struct _protocol_t *";
+  Result += "_OBJC_LABEL_PROTOCOL_$_"; Result += PDecl->getNameAsString();
+  Result += " = &_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
+  Result += ";\n";
+
+  // Mark this protocol as having been generated.
+  if (!ObjCSynthesizedProtocols.insert(PDecl->getCanonicalDecl()).second)
+    llvm_unreachable("protocol already synthesized");
+}
+
+/// hasObjCExceptionAttribute - Return true if this class or any super
+/// class has the __objc_exception__ attribute.
+/// FIXME. Move this to ASTContext.cpp as it is also used for IRGen.
+static bool hasObjCExceptionAttribute(ASTContext &Context,
+                                      const ObjCInterfaceDecl *OID) {
+  if (OID->hasAttr<ObjCExceptionAttr>())
+    return true;
+  if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
+    return hasObjCExceptionAttribute(Context, Super);
+  return false;
+}
+
+void RewriteModernObjC::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                           std::string &Result) {
+  ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
+
+  // Explicitly declared @interface's are already synthesized.
+  if (CDecl->isImplicitInterfaceDecl())
+    assert(false &&
+           "Legacy implicit interface rewriting not supported in moder abi");
+
+  WriteModernMetadataDeclarations(Context, Result);
+  SmallVector<ObjCIvarDecl *, 8> IVars;
+
+  for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
+      IVD; IVD = IVD->getNextIvar()) {
+    // Ignore unnamed bit-fields.
+    if (!IVD->getDeclName())
+      continue;
+    IVars.push_back(IVD);
+  }
+
+  Write__ivar_list_t_initializer(*this, Context, Result, IVars,
+                                 "_OBJC_$_INSTANCE_VARIABLES_",
+                                 CDecl);
+
+  // Build _objc_method_list for class's instance methods if needed
+  SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
+
+  // If any of our property implementations have associated getters or
+  // setters, produce metadata for them as well.
+  for (const auto *Prop : IDecl->property_impls()) {
+    if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      continue;
+    if (!Prop->getPropertyIvarDecl())
+      continue;
+    ObjCPropertyDecl *PD = Prop->getPropertyDecl();
+    if (!PD)
+      continue;
+    if (ObjCMethodDecl *Getter = Prop->getGetterMethodDecl())
+      if (mustSynthesizeSetterGetterMethod(IDecl, PD, true /*getter*/))
+        InstanceMethods.push_back(Getter);
+    if (PD->isReadOnly())
+      continue;
+    if (ObjCMethodDecl *Setter = Prop->getSetterMethodDecl())
+      if (mustSynthesizeSetterGetterMethod(IDecl, PD, false /*setter*/))
+        InstanceMethods.push_back(Setter);
+  }
+
+  Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
+                                  "_OBJC_$_INSTANCE_METHODS_",
+                                  IDecl->getNameAsString(), true);
+
+  SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
+
+  Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
+                                  "_OBJC_$_CLASS_METHODS_",
+                                  IDecl->getNameAsString(), true);
+
+  // Protocols referenced in class declaration?
+  // Protocol's super protocol list
+  std::vector<ObjCProtocolDecl *> RefedProtocols;
+  const ObjCList<ObjCProtocolDecl> &Protocols = CDecl->getReferencedProtocols();
+  for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
+       E = Protocols.end();
+       I != E; ++I) {
+    RefedProtocols.push_back(*I);
+    // Must write out all protocol definitions in current qualifier list,
+    // and in their nested qualifiers before writing out current definition.
+    RewriteObjCProtocolMetaData(*I, Result);
+  }
+
+  Write_protocol_list_initializer(Context, Result,
+                                  RefedProtocols,
+                                  "_OBJC_CLASS_PROTOCOLS_$_",
+                                  IDecl->getNameAsString());
+
+  // Protocol's property metadata.
+  SmallVector<ObjCPropertyDecl *, 8> ClassProperties(
+      CDecl->instance_properties());
+  Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
+                                 /* Container */IDecl,
+                                 "_OBJC_$_PROP_LIST_",
+                                 CDecl->getNameAsString());
+
+  // Data for initializing _class_ro_t  metaclass meta-data
+  uint32_t flags = CLS_META;
+  std::string InstanceSize;
+  std::string InstanceStart;
+
+  bool classIsHidden = CDecl->getVisibility() == HiddenVisibility;
+  if (classIsHidden)
+    flags |= OBJC2_CLS_HIDDEN;
+
+  if (!CDecl->getSuperClass())
+    // class is root
+    flags |= CLS_ROOT;
+  InstanceSize = "sizeof(struct _class_t)";
+  InstanceStart = InstanceSize;
+  Write__class_ro_t_initializer(Context, Result, flags,
+                                InstanceStart, InstanceSize,
+                                ClassMethods,
+                                nullptr,
+                                nullptr,
+                                nullptr,
+                                "_OBJC_METACLASS_RO_$_",
+                                CDecl->getNameAsString());
+
+  // Data for initializing _class_ro_t meta-data
+  flags = CLS;
+  if (classIsHidden)
+    flags |= OBJC2_CLS_HIDDEN;
+
+  if (hasObjCExceptionAttribute(*Context, CDecl))
+    flags |= CLS_EXCEPTION;
+
+  if (!CDecl->getSuperClass())
+    // class is root
+    flags |= CLS_ROOT;
+
+  InstanceSize.clear();
+  InstanceStart.clear();
+  if (!ObjCSynthesizedStructs.count(CDecl)) {
+    InstanceSize = "0";
+    InstanceStart = "0";
+  }
+  else {
+    InstanceSize = "sizeof(struct ";
+    InstanceSize += CDecl->getNameAsString();
+    InstanceSize += "_IMPL)";
+
+    ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
+    if (IVD) {
+      RewriteIvarOffsetComputation(IVD, InstanceStart);
+    }
+    else
+      InstanceStart = InstanceSize;
+  }
+  Write__class_ro_t_initializer(Context, Result, flags,
+                                InstanceStart, InstanceSize,
+                                InstanceMethods,
+                                RefedProtocols,
+                                IVars,
+                                ClassProperties,
+                                "_OBJC_CLASS_RO_$_",
+                                CDecl->getNameAsString());
+
+  Write_class_t(Context, Result,
+                "OBJC_METACLASS_$_",
+                CDecl, /*metaclass*/true);
+
+  Write_class_t(Context, Result,
+                "OBJC_CLASS_$_",
+                CDecl, /*metaclass*/false);
+
+  if (ImplementationIsNonLazy(IDecl))
+    DefinedNonLazyClasses.push_back(CDecl);
+}
+
+void RewriteModernObjC::RewriteClassSetupInitHook(std::string &Result) {
+  int ClsDefCount = ClassImplementation.size();
+  if (!ClsDefCount)
+    return;
+  Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
+  Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
+  Result += "static void *OBJC_CLASS_SETUP[] = {\n";
+  for (int i = 0; i < ClsDefCount; i++) {
+    ObjCImplementationDecl *IDecl = ClassImplementation[i];
+    ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
+    Result += "\t(void *)&OBJC_CLASS_SETUP_$_";
+    Result  += CDecl->getName(); Result += ",\n";
+  }
+  Result += "};\n";
+}
+
+void RewriteModernObjC::RewriteMetaDataIntoBuffer(std::string &Result) {
+  int ClsDefCount = ClassImplementation.size();
+  int CatDefCount = CategoryImplementation.size();
+
+  // For each implemented class, write out all its meta data.
+  for (int i = 0; i < ClsDefCount; i++)
+    RewriteObjCClassMetaData(ClassImplementation[i], Result);
+
+  RewriteClassSetupInitHook(Result);
+
+  // For each implemented category, write out all its meta data.
+  for (int i = 0; i < CatDefCount; i++)
+    RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
+
+  RewriteCategorySetupInitHook(Result);
+
+  if (ClsDefCount > 0) {
+    if (LangOpts.MicrosoftExt)
+      Result += "__declspec(allocate(\".objc_classlist$B\")) ";
+    Result += "static struct _class_t *L_OBJC_LABEL_CLASS_$ [";
+    Result += llvm::utostr(ClsDefCount); Result += "]";
+    Result +=
+      " __attribute__((used, section (\"__DATA, __objc_classlist,"
+      "regular,no_dead_strip\")))= {\n";
+    for (int i = 0; i < ClsDefCount; i++) {
+      Result += "\t&OBJC_CLASS_$_";
+      Result += ClassImplementation[i]->getNameAsString();
+      Result += ",\n";
+    }
+    Result += "};\n";
+
+    if (!DefinedNonLazyClasses.empty()) {
+      if (LangOpts.MicrosoftExt)
+        Result += "__declspec(allocate(\".objc_nlclslist$B\")) \n";
+      Result += "static struct _class_t *_OBJC_LABEL_NONLAZY_CLASS_$[] = {\n\t";
+      for (unsigned i = 0, e = DefinedNonLazyClasses.size(); i < e; i++) {
+        Result += "\t&OBJC_CLASS_$_"; Result += DefinedNonLazyClasses[i]->getNameAsString();
+        Result += ",\n";
+      }
+      Result += "};\n";
+    }
+  }
+
+  if (CatDefCount > 0) {
+    if (LangOpts.MicrosoftExt)
+      Result += "__declspec(allocate(\".objc_catlist$B\")) ";
+    Result += "static struct _category_t *L_OBJC_LABEL_CATEGORY_$ [";
+    Result += llvm::utostr(CatDefCount); Result += "]";
+    Result +=
+    " __attribute__((used, section (\"__DATA, __objc_catlist,"
+    "regular,no_dead_strip\")))= {\n";
+    for (int i = 0; i < CatDefCount; i++) {
+      Result += "\t&_OBJC_$_CATEGORY_";
+      Result +=
+        CategoryImplementation[i]->getClassInterface()->getNameAsString();
+      Result += "_$_";
+      Result += CategoryImplementation[i]->getNameAsString();
+      Result += ",\n";
+    }
+    Result += "};\n";
+  }
+
+  if (!DefinedNonLazyCategories.empty()) {
+    if (LangOpts.MicrosoftExt)
+      Result += "__declspec(allocate(\".objc_nlcatlist$B\")) \n";
+    Result += "static struct _category_t *_OBJC_LABEL_NONLAZY_CATEGORY_$[] = {\n\t";
+    for (unsigned i = 0, e = DefinedNonLazyCategories.size(); i < e; i++) {
+      Result += "\t&_OBJC_$_CATEGORY_";
+      Result +=
+        DefinedNonLazyCategories[i]->getClassInterface()->getNameAsString();
+      Result += "_$_";
+      Result += DefinedNonLazyCategories[i]->getNameAsString();
+      Result += ",\n";
+    }
+    Result += "};\n";
+  }
+}
+
+void RewriteModernObjC::WriteImageInfo(std::string &Result) {
+  if (LangOpts.MicrosoftExt)
+    Result += "__declspec(allocate(\".objc_imageinfo$B\")) \n";
+
+  Result += "static struct IMAGE_INFO { unsigned version; unsigned flag; } ";
+  // version 0, ObjCABI is 2
+  Result += "_OBJC_IMAGE_INFO = { 0, 2 };\n";
+}
+
+/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
+/// implementation.
+void RewriteModernObjC::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
+                                              std::string &Result) {
+  WriteModernMetadataDeclarations(Context, Result);
+  ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
+  // Find category declaration for this implementation.
+  ObjCCategoryDecl *CDecl
+    = ClassDecl->FindCategoryDeclaration(IDecl->getIdentifier());
+
+  std::string FullCategoryName = ClassDecl->getNameAsString();
+  FullCategoryName += "_$_";
+  FullCategoryName += CDecl->getNameAsString();
+
+  // Build _objc_method_list for class's instance methods if needed
+  SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
+
+  // If any of our property implementations have associated getters or
+  // setters, produce metadata for them as well.
+  for (const auto *Prop : IDecl->property_impls()) {
+    if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      continue;
+    if (!Prop->getPropertyIvarDecl())
+      continue;
+    ObjCPropertyDecl *PD = Prop->getPropertyDecl();
+    if (!PD)
+      continue;
+    if (ObjCMethodDecl *Getter = Prop->getGetterMethodDecl())
+      InstanceMethods.push_back(Getter);
+    if (PD->isReadOnly())
+      continue;
+    if (ObjCMethodDecl *Setter = Prop->getSetterMethodDecl())
+      InstanceMethods.push_back(Setter);
+  }
+
+  Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
+                                  "_OBJC_$_CATEGORY_INSTANCE_METHODS_",
+                                  FullCategoryName, true);
+
+  SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
+
+  Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
+                                  "_OBJC_$_CATEGORY_CLASS_METHODS_",
+                                  FullCategoryName, true);
+
+  // Protocols referenced in class declaration?
+  // Protocol's super protocol list
+  SmallVector<ObjCProtocolDecl *, 8> RefedProtocols(CDecl->protocols());
+  for (auto *I : CDecl->protocols())
+    // Must write out all protocol definitions in current qualifier list,
+    // and in their nested qualifiers before writing out current definition.
+    RewriteObjCProtocolMetaData(I, Result);
+
+  Write_protocol_list_initializer(Context, Result,
+                                  RefedProtocols,
+                                  "_OBJC_CATEGORY_PROTOCOLS_$_",
+                                  FullCategoryName);
+
+  // Protocol's property metadata.
+  SmallVector<ObjCPropertyDecl *, 8> ClassProperties(
+      CDecl->instance_properties());
+  Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
+                                /* Container */IDecl,
+                                "_OBJC_$_PROP_LIST_",
+                                FullCategoryName);
+
+  Write_category_t(*this, Context, Result,
+                   CDecl,
+                   ClassDecl,
+                   InstanceMethods,
+                   ClassMethods,
+                   RefedProtocols,
+                   ClassProperties);
+
+  // Determine if this category is also "non-lazy".
+  if (ImplementationIsNonLazy(IDecl))
+    DefinedNonLazyCategories.push_back(CDecl);
+}
+
+void RewriteModernObjC::RewriteCategorySetupInitHook(std::string &Result) {
+  int CatDefCount = CategoryImplementation.size();
+  if (!CatDefCount)
+    return;
+  Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
+  Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
+  Result += "static void *OBJC_CATEGORY_SETUP[] = {\n";
+  for (int i = 0; i < CatDefCount; i++) {
+    ObjCCategoryImplDecl *IDecl = CategoryImplementation[i];
+    ObjCCategoryDecl *CatDecl= IDecl->getCategoryDecl();
+    ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
+    Result += "\t(void *)&OBJC_CATEGORY_SETUP_$_";
+    Result += ClassDecl->getName();
+    Result += "_$_";
+    Result += CatDecl->getName();
+    Result += ",\n";
+  }
+  Result += "};\n";
+}
+
+// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
+/// class methods.
+template<typename MethodIterator>
+void RewriteModernObjC::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
+                                             MethodIterator MethodEnd,
+                                             bool IsInstanceMethod,
+                                             StringRef prefix,
+                                             StringRef ClassName,
+                                             std::string &Result) {
+  if (MethodBegin == MethodEnd) return;
+
+  if (!objc_impl_method) {
+    /* struct _objc_method {
+     SEL _cmd;
+     char *method_types;
+     void *_imp;
+     }
+     */
+    Result += "\nstruct _objc_method {\n";
+    Result += "\tSEL _cmd;\n";
+    Result += "\tchar *method_types;\n";
+    Result += "\tvoid *_imp;\n";
+    Result += "};\n";
+
+    objc_impl_method = true;
+  }
+
+  // Build _objc_method_list for class's methods if needed
+
+  /* struct  {
+   struct _objc_method_list *next_method;
+   int method_count;
+   struct _objc_method method_list[];
+   }
+   */
+  unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
+  Result += "\n";
+  if (LangOpts.MicrosoftExt) {
+    if (IsInstanceMethod)
+      Result += "__declspec(allocate(\".inst_meth$B\")) ";
+    else
+      Result += "__declspec(allocate(\".cls_meth$B\")) ";
+  }
+  Result += "static struct {\n";
+  Result += "\tstruct _objc_method_list *next_method;\n";
+  Result += "\tint method_count;\n";
+  Result += "\tstruct _objc_method method_list[";
+  Result += utostr(NumMethods);
+  Result += "];\n} _OBJC_";
+  Result += prefix;
+  Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
+  Result += "_METHODS_";
+  Result += ClassName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __";
+  Result += IsInstanceMethod ? "inst" : "cls";
+  Result += "_meth\")))= ";
+  Result += "{\n\t0, " + utostr(NumMethods) + "\n";
+
+  Result += "\t,{{(SEL)\"";
+  Result += (*MethodBegin)->getSelector().getAsString().c_str();
+  std::string MethodTypeString;
+  Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
+  Result += "\", \"";
+  Result += MethodTypeString;
+  Result += "\", (void *)";
+  Result += MethodInternalNames[*MethodBegin];
+  Result += "}\n";
+  for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
+    Result += "\t  ,{(SEL)\"";
+    Result += (*MethodBegin)->getSelector().getAsString().c_str();
+    std::string MethodTypeString;
+    Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
+    Result += "\", \"";
+    Result += MethodTypeString;
+    Result += "\", (void *)";
+    Result += MethodInternalNames[*MethodBegin];
+    Result += "}\n";
+  }
+  Result += "\t }\n};\n";
+}
+
+Stmt *RewriteModernObjC::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) {
+  SourceRange OldRange = IV->getSourceRange();
+  Expr *BaseExpr = IV->getBase();
+
+  // Rewrite the base, but without actually doing replaces.
+  {
+    DisableReplaceStmtScope S(*this);
+    BaseExpr = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(BaseExpr));
+    IV->setBase(BaseExpr);
+  }
+
+  ObjCIvarDecl *D = IV->getDecl();
+
+  Expr *Replacement = IV;
+
+    if (BaseExpr->getType()->isObjCObjectPointerType()) {
+      const ObjCInterfaceType *iFaceDecl =
+        dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
+      assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
+      // lookup which class implements the instance variable.
+      ObjCInterfaceDecl *clsDeclared = nullptr;
+      iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
+                                                   clsDeclared);
+      assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
+
+      // Build name of symbol holding ivar offset.
+      std::string IvarOffsetName;
+      if (D->isBitField())
+        ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
+      else
+        WriteInternalIvarName(clsDeclared, D, IvarOffsetName);
+
+      ReferencedIvars[clsDeclared].insert(D);
+
+      // cast offset to "char *".
+      CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context,
+                                                    Context->getPointerType(Context->CharTy),
+                                                    CK_BitCast,
+                                                    BaseExpr);
+      VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                       SourceLocation(), &Context->Idents.get(IvarOffsetName),
+                                       Context->UnsignedLongTy, nullptr,
+                                       SC_Extern);
+      DeclRefExpr *DRE = new (Context)
+          DeclRefExpr(*Context, NewVD, false, Context->UnsignedLongTy,
+                      VK_LValue, SourceLocation());
+      BinaryOperator *addExpr = BinaryOperator::Create(
+          *Context, castExpr, DRE, BO_Add,
+          Context->getPointerType(Context->CharTy), VK_PRValue, OK_Ordinary,
+          SourceLocation(), FPOptionsOverride());
+      // Don't forget the parens to enforce the proper binding.
+      ParenExpr *PE = new (Context) ParenExpr(SourceLocation(),
+                                              SourceLocation(),
+                                              addExpr);
+      QualType IvarT = D->getType();
+      if (D->isBitField())
+        IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
+
+      if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
+        RecordDecl *RD = IvarT->castAs<RecordType>()->getDecl();
+        RD = RD->getDefinition();
+        if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
+          // decltype(((Foo_IMPL*)0)->bar) *
+          auto *CDecl = cast<ObjCContainerDecl>(D->getDeclContext());
+          // ivar in class extensions requires special treatment.
+          if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
+            CDecl = CatDecl->getClassInterface();
+          std::string RecName = std::string(CDecl->getName());
+          RecName += "_IMPL";
+          RecordDecl *RD = RecordDecl::Create(
+              *Context, TTK_Struct, TUDecl, SourceLocation(), SourceLocation(),
+              &Context->Idents.get(RecName));
+          QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
+          unsigned UnsignedIntSize =
+            static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
+          Expr *Zero = IntegerLiteral::Create(*Context,
+                                              llvm::APInt(UnsignedIntSize, 0),
+                                              Context->UnsignedIntTy, SourceLocation());
+          Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
+          ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                                  Zero);
+          FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                            SourceLocation(),
+                                            &Context->Idents.get(D->getNameAsString()),
+                                            IvarT, nullptr,
+                                            /*BitWidth=*/nullptr,
+                                            /*Mutable=*/true, ICIS_NoInit);
+          MemberExpr *ME = MemberExpr::CreateImplicit(
+              *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
+          IvarT = Context->getDecltypeType(ME, ME->getType());
+        }
+      }
+      convertObjCTypeToCStyleType(IvarT);
+      QualType castT = Context->getPointerType(IvarT);
+
+      castExpr = NoTypeInfoCStyleCastExpr(Context,
+                                          castT,
+                                          CK_BitCast,
+                                          PE);
+
+      Expr *Exp = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), castExpr, UO_Deref, IvarT,
+          VK_LValue, OK_Ordinary, SourceLocation(), false, FPOptionsOverride());
+      PE = new (Context) ParenExpr(OldRange.getBegin(),
+                                   OldRange.getEnd(),
+                                   Exp);
+
+      if (D->isBitField()) {
+        FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                          SourceLocation(),
+                                          &Context->Idents.get(D->getNameAsString()),
+                                          D->getType(), nullptr,
+                                          /*BitWidth=*/D->getBitWidth(),
+                                          /*Mutable=*/true, ICIS_NoInit);
+        MemberExpr *ME =
+            MemberExpr::CreateImplicit(*Context, PE, /*isArrow*/ false, FD,
+                                       FD->getType(), VK_LValue, OK_Ordinary);
+        Replacement = ME;
+
+      }
+      else
+        Replacement = PE;
+    }
+
+    ReplaceStmtWithRange(IV, Replacement, OldRange);
+    return Replacement;
+}
+
+#endif // CLANG_ENABLE_OBJC_REWRITER
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteObjC.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteObjC.cpp
new file mode 100644
index 0000000000..b2ecb42c43
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteObjC.cpp
@@ -0,0 +1,5887 @@
+//===--- RewriteObjC.cpp - Playground for the code rewriter ---------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Hacks and fun related to the code rewriter.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Rewrite/Frontend/ASTConsumers.h"
+#include "clang/AST/AST.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/Attr.h"
+#include "clang/AST/ParentMap.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Config/config.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Rewrite/Core/Rewriter.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <memory>
+
+#if CLANG_ENABLE_OBJC_REWRITER
+
+using namespace clang;
+using llvm::utostr;
+
+namespace {
+  class RewriteObjC : public ASTConsumer {
+  protected:
+    enum {
+      BLOCK_FIELD_IS_OBJECT   =  3,  /* id, NSObject, __attribute__((NSObject)),
+                                        block, ... */
+      BLOCK_FIELD_IS_BLOCK    =  7,  /* a block variable */
+      BLOCK_FIELD_IS_BYREF    =  8,  /* the on stack structure holding the
+                                        __block variable */
+      BLOCK_FIELD_IS_WEAK     = 16,  /* declared __weak, only used in byref copy
+                                        helpers */
+      BLOCK_BYREF_CALLER      = 128, /* called from __block (byref) copy/dispose
+                                        support routines */
+      BLOCK_BYREF_CURRENT_MAX = 256
+    };
+
+    enum {
+      BLOCK_NEEDS_FREE =        (1 << 24),
+      BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
+      BLOCK_HAS_CXX_OBJ =       (1 << 26),
+      BLOCK_IS_GC =             (1 << 27),
+      BLOCK_IS_GLOBAL =         (1 << 28),
+      BLOCK_HAS_DESCRIPTOR =    (1 << 29)
+    };
+    static const int OBJC_ABI_VERSION = 7;
+
+    Rewriter Rewrite;
+    DiagnosticsEngine &Diags;
+    const LangOptions &LangOpts;
+    ASTContext *Context;
+    SourceManager *SM;
+    TranslationUnitDecl *TUDecl;
+    FileID MainFileID;
+    const char *MainFileStart, *MainFileEnd;
+    Stmt *CurrentBody;
+    ParentMap *PropParentMap; // created lazily.
+    std::string InFileName;
+    std::unique_ptr<raw_ostream> OutFile;
+    std::string Preamble;
+
+    TypeDecl *ProtocolTypeDecl;
+    VarDecl *GlobalVarDecl;
+    unsigned RewriteFailedDiag;
+    // ObjC string constant support.
+    unsigned NumObjCStringLiterals;
+    VarDecl *ConstantStringClassReference;
+    RecordDecl *NSStringRecord;
+
+    // ObjC foreach break/continue generation support.
+    int BcLabelCount;
+
+    unsigned TryFinallyContainsReturnDiag;
+    // Needed for super.
+    ObjCMethodDecl *CurMethodDef;
+    RecordDecl *SuperStructDecl;
+    RecordDecl *ConstantStringDecl;
+
+    FunctionDecl *MsgSendFunctionDecl;
+    FunctionDecl *MsgSendSuperFunctionDecl;
+    FunctionDecl *MsgSendStretFunctionDecl;
+    FunctionDecl *MsgSendSuperStretFunctionDecl;
+    FunctionDecl *MsgSendFpretFunctionDecl;
+    FunctionDecl *GetClassFunctionDecl;
+    FunctionDecl *GetMetaClassFunctionDecl;
+    FunctionDecl *GetSuperClassFunctionDecl;
+    FunctionDecl *SelGetUidFunctionDecl;
+    FunctionDecl *CFStringFunctionDecl;
+    FunctionDecl *SuperConstructorFunctionDecl;
+    FunctionDecl *CurFunctionDef;
+    FunctionDecl *CurFunctionDeclToDeclareForBlock;
+
+    /* Misc. containers needed for meta-data rewrite. */
+    SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
+    SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
+    llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
+    llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
+    llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCForwardDecls;
+    llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
+    SmallVector<Stmt *, 32> Stmts;
+    SmallVector<int, 8> ObjCBcLabelNo;
+    // Remember all the @protocol(<expr>) expressions.
+    llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
+
+    llvm::DenseSet<uint64_t> CopyDestroyCache;
+
+    // Block expressions.
+    SmallVector<BlockExpr *, 32> Blocks;
+    SmallVector<int, 32> InnerDeclRefsCount;
+    SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
+
+    SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
+
+    // Block related declarations.
+    SmallVector<ValueDecl *, 8> BlockByCopyDecls;
+    llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
+    SmallVector<ValueDecl *, 8> BlockByRefDecls;
+    llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
+    llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
+    llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
+    llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
+
+    llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
+
+    // This maps an original source AST to it's rewritten form. This allows
+    // us to avoid rewriting the same node twice (which is very uncommon).
+    // This is needed to support some of the exotic property rewriting.
+    llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
+
+    // Needed for header files being rewritten
+    bool IsHeader;
+    bool SilenceRewriteMacroWarning;
+    bool objc_impl_method;
+
+    bool DisableReplaceStmt;
+    class DisableReplaceStmtScope {
+      RewriteObjC &R;
+      bool SavedValue;
+
+    public:
+      DisableReplaceStmtScope(RewriteObjC &R)
+        : R(R), SavedValue(R.DisableReplaceStmt) {
+        R.DisableReplaceStmt = true;
+      }
+
+      ~DisableReplaceStmtScope() {
+        R.DisableReplaceStmt = SavedValue;
+      }
+    };
+
+    void InitializeCommon(ASTContext &context);
+
+  public:
+    // Top Level Driver code.
+    bool HandleTopLevelDecl(DeclGroupRef D) override {
+      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
+        if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(*I)) {
+          if (!Class->isThisDeclarationADefinition()) {
+            RewriteForwardClassDecl(D);
+            break;
+          }
+        }
+
+        if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>(*I)) {
+          if (!Proto->isThisDeclarationADefinition()) {
+            RewriteForwardProtocolDecl(D);
+            break;
+          }
+        }
+
+        HandleTopLevelSingleDecl(*I);
+      }
+      return true;
+    }
+
+    void HandleTopLevelSingleDecl(Decl *D);
+    void HandleDeclInMainFile(Decl *D);
+    RewriteObjC(std::string inFile, std::unique_ptr<raw_ostream> OS,
+                DiagnosticsEngine &D, const LangOptions &LOpts,
+                bool silenceMacroWarn);
+
+    ~RewriteObjC() override {}
+
+    void HandleTranslationUnit(ASTContext &C) override;
+
+    void ReplaceStmt(Stmt *Old, Stmt *New) {
+      ReplaceStmtWithRange(Old, New, Old->getSourceRange());
+    }
+
+    void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
+      assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
+
+      Stmt *ReplacingStmt = ReplacedNodes[Old];
+      if (ReplacingStmt)
+        return; // We can't rewrite the same node twice.
+
+      if (DisableReplaceStmt)
+        return;
+
+      // Measure the old text.
+      int Size = Rewrite.getRangeSize(SrcRange);
+      if (Size == -1) {
+        Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
+            << Old->getSourceRange();
+        return;
+      }
+      // Get the new text.
+      std::string SStr;
+      llvm::raw_string_ostream S(SStr);
+      New->printPretty(S, nullptr, PrintingPolicy(LangOpts));
+      const std::string &Str = S.str();
+
+      // If replacement succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
+        ReplacedNodes[Old] = New;
+        return;
+      }
+      if (SilenceRewriteMacroWarning)
+        return;
+      Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
+          << Old->getSourceRange();
+    }
+
+    void InsertText(SourceLocation Loc, StringRef Str,
+                    bool InsertAfter = true) {
+      // If insertion succeeded or warning disabled return with no warning.
+      if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
+          SilenceRewriteMacroWarning)
+        return;
+
+      Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
+    }
+
+    void ReplaceText(SourceLocation Start, unsigned OrigLength,
+                     StringRef Str) {
+      // If removal succeeded or warning disabled return with no warning.
+      if (!Rewrite.ReplaceText(Start, OrigLength, Str) ||
+          SilenceRewriteMacroWarning)
+        return;
+
+      Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
+    }
+
+    // Syntactic Rewriting.
+    void RewriteRecordBody(RecordDecl *RD);
+    void RewriteInclude();
+    void RewriteForwardClassDecl(DeclGroupRef D);
+    void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
+    void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
+                                     const std::string &typedefString);
+    void RewriteImplementations();
+    void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
+                                 ObjCImplementationDecl *IMD,
+                                 ObjCCategoryImplDecl *CID);
+    void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
+    void RewriteImplementationDecl(Decl *Dcl);
+    void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
+                               ObjCMethodDecl *MDecl, std::string &ResultStr);
+    void RewriteTypeIntoString(QualType T, std::string &ResultStr,
+                               const FunctionType *&FPRetType);
+    void RewriteByRefString(std::string &ResultStr, const std::string &Name,
+                            ValueDecl *VD, bool def=false);
+    void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
+    void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
+    void RewriteForwardProtocolDecl(DeclGroupRef D);
+    void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
+    void RewriteMethodDeclaration(ObjCMethodDecl *Method);
+    void RewriteProperty(ObjCPropertyDecl *prop);
+    void RewriteFunctionDecl(FunctionDecl *FD);
+    void RewriteBlockPointerType(std::string& Str, QualType Type);
+    void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
+    void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
+    void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
+    void RewriteTypeOfDecl(VarDecl *VD);
+    void RewriteObjCQualifiedInterfaceTypes(Expr *E);
+
+    // Expression Rewriting.
+    Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
+    Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
+    Stmt *RewritePropertyOrImplicitGetter(PseudoObjectExpr *Pseudo);
+    Stmt *RewritePropertyOrImplicitSetter(PseudoObjectExpr *Pseudo);
+    Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
+    Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
+    Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
+    Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
+    void RewriteTryReturnStmts(Stmt *S);
+    void RewriteSyncReturnStmts(Stmt *S, std::string buf);
+    Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
+    Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
+    Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
+    Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
+                                       SourceLocation OrigEnd);
+    Stmt *RewriteBreakStmt(BreakStmt *S);
+    Stmt *RewriteContinueStmt(ContinueStmt *S);
+    void RewriteCastExpr(CStyleCastExpr *CE);
+
+    // Block rewriting.
+    void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
+
+    // Block specific rewrite rules.
+    void RewriteBlockPointerDecl(NamedDecl *VD);
+    void RewriteByRefVar(VarDecl *VD);
+    Stmt *RewriteBlockDeclRefExpr(DeclRefExpr *VD);
+    Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
+    void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
+
+    void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
+                                      std::string &Result);
+
+    void Initialize(ASTContext &context) override = 0;
+
+    // Metadata Rewriting.
+    virtual void RewriteMetaDataIntoBuffer(std::string &Result) = 0;
+    virtual void RewriteObjCProtocolListMetaData(const ObjCList<ObjCProtocolDecl> &Prots,
+                                                 StringRef prefix,
+                                                 StringRef ClassName,
+                                                 std::string &Result) = 0;
+    virtual void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
+                                             std::string &Result) = 0;
+    virtual void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
+                                     StringRef prefix,
+                                     StringRef ClassName,
+                                     std::string &Result) = 0;
+    virtual void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                          std::string &Result) = 0;
+
+    // Rewriting ivar access
+    virtual Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) = 0;
+    virtual void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                         std::string &Result) = 0;
+
+    // Misc. AST transformation routines. Sometimes they end up calling
+    // rewriting routines on the new ASTs.
+    CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
+                                           ArrayRef<Expr *> Args,
+                                           SourceLocation StartLoc=SourceLocation(),
+                                           SourceLocation EndLoc=SourceLocation());
+    CallExpr *SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
+                                        QualType msgSendType,
+                                        QualType returnType,
+                                        SmallVectorImpl<QualType> &ArgTypes,
+                                        SmallVectorImpl<Expr*> &MsgExprs,
+                                        ObjCMethodDecl *Method);
+    Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
+                           SourceLocation StartLoc=SourceLocation(),
+                           SourceLocation EndLoc=SourceLocation());
+
+    void SynthCountByEnumWithState(std::string &buf);
+    void SynthMsgSendFunctionDecl();
+    void SynthMsgSendSuperFunctionDecl();
+    void SynthMsgSendStretFunctionDecl();
+    void SynthMsgSendFpretFunctionDecl();
+    void SynthMsgSendSuperStretFunctionDecl();
+    void SynthGetClassFunctionDecl();
+    void SynthGetMetaClassFunctionDecl();
+    void SynthGetSuperClassFunctionDecl();
+    void SynthSelGetUidFunctionDecl();
+    void SynthSuperConstructorFunctionDecl();
+
+    std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
+    std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
+                                      StringRef funcName, std::string Tag);
+    std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
+                                      StringRef funcName, std::string Tag);
+    std::string SynthesizeBlockImpl(BlockExpr *CE,
+                                    std::string Tag, std::string Desc);
+    std::string SynthesizeBlockDescriptor(std::string DescTag,
+                                          std::string ImplTag,
+                                          int i, StringRef funcName,
+                                          unsigned hasCopy);
+    Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
+    void SynthesizeBlockLiterals(SourceLocation FunLocStart,
+                                 StringRef FunName);
+    FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
+    Stmt *SynthBlockInitExpr(BlockExpr *Exp,
+            const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
+
+    // Misc. helper routines.
+    QualType getProtocolType();
+    void WarnAboutReturnGotoStmts(Stmt *S);
+    void HasReturnStmts(Stmt *S, bool &hasReturns);
+    void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
+    void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
+    void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
+
+    bool IsDeclStmtInForeachHeader(DeclStmt *DS);
+    void CollectBlockDeclRefInfo(BlockExpr *Exp);
+    void GetBlockDeclRefExprs(Stmt *S);
+    void GetInnerBlockDeclRefExprs(Stmt *S,
+                SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
+                llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts);
+
+    // We avoid calling Type::isBlockPointerType(), since it operates on the
+    // canonical type. We only care if the top-level type is a closure pointer.
+    bool isTopLevelBlockPointerType(QualType T) {
+      return isa<BlockPointerType>(T);
+    }
+
+    /// convertBlockPointerToFunctionPointer - Converts a block-pointer type
+    /// to a function pointer type and upon success, returns true; false
+    /// otherwise.
+    bool convertBlockPointerToFunctionPointer(QualType &T) {
+      if (isTopLevelBlockPointerType(T)) {
+        const auto *BPT = T->castAs<BlockPointerType>();
+        T = Context->getPointerType(BPT->getPointeeType());
+        return true;
+      }
+      return false;
+    }
+
+    bool needToScanForQualifiers(QualType T);
+    QualType getSuperStructType();
+    QualType getConstantStringStructType();
+    QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
+    bool BufferContainsPPDirectives(const char *startBuf, const char *endBuf);
+
+    void convertToUnqualifiedObjCType(QualType &T) {
+      if (T->isObjCQualifiedIdType())
+        T = Context->getObjCIdType();
+      else if (T->isObjCQualifiedClassType())
+        T = Context->getObjCClassType();
+      else if (T->isObjCObjectPointerType() &&
+               T->getPointeeType()->isObjCQualifiedInterfaceType()) {
+        if (const ObjCObjectPointerType * OBJPT =
+              T->getAsObjCInterfacePointerType()) {
+          const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
+          T = QualType(IFaceT, 0);
+          T = Context->getPointerType(T);
+        }
+     }
+    }
+
+    // FIXME: This predicate seems like it would be useful to add to ASTContext.
+    bool isObjCType(QualType T) {
+      if (!LangOpts.ObjC)
+        return false;
+
+      QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
+
+      if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
+          OCT == Context->getCanonicalType(Context->getObjCClassType()))
+        return true;
+
+      if (const PointerType *PT = OCT->getAs<PointerType>()) {
+        if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
+            PT->getPointeeType()->isObjCQualifiedIdType())
+          return true;
+      }
+      return false;
+    }
+    bool PointerTypeTakesAnyBlockArguments(QualType QT);
+    bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
+    void GetExtentOfArgList(const char *Name, const char *&LParen,
+                            const char *&RParen);
+
+    void QuoteDoublequotes(std::string &From, std::string &To) {
+      for (unsigned i = 0; i < From.length(); i++) {
+        if (From[i] == '"')
+          To += "\\\"";
+        else
+          To += From[i];
+      }
+    }
+
+    QualType getSimpleFunctionType(QualType result,
+                                   ArrayRef<QualType> args,
+                                   bool variadic = false) {
+      if (result == Context->getObjCInstanceType())
+        result =  Context->getObjCIdType();
+      FunctionProtoType::ExtProtoInfo fpi;
+      fpi.Variadic = variadic;
+      return Context->getFunctionType(result, args, fpi);
+    }
+
+    // Helper function: create a CStyleCastExpr with trivial type source info.
+    CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
+                                             CastKind Kind, Expr *E) {
+      TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(Ty, SourceLocation());
+      return CStyleCastExpr::Create(*Ctx, Ty, VK_PRValue, Kind, E, nullptr,
+                                    FPOptionsOverride(), TInfo,
+                                    SourceLocation(), SourceLocation());
+    }
+
+    StringLiteral *getStringLiteral(StringRef Str) {
+      QualType StrType = Context->getConstantArrayType(
+          Context->CharTy, llvm::APInt(32, Str.size() + 1), nullptr,
+          ArrayType::Normal, 0);
+      return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
+                                   /*Pascal=*/false, StrType, SourceLocation());
+    }
+  };
+
+  class RewriteObjCFragileABI : public RewriteObjC {
+  public:
+    RewriteObjCFragileABI(std::string inFile, std::unique_ptr<raw_ostream> OS,
+                          DiagnosticsEngine &D, const LangOptions &LOpts,
+                          bool silenceMacroWarn)
+        : RewriteObjC(inFile, std::move(OS), D, LOpts, silenceMacroWarn) {}
+
+    ~RewriteObjCFragileABI() override {}
+    void Initialize(ASTContext &context) override;
+
+    // Rewriting metadata
+    template<typename MethodIterator>
+    void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
+                                    MethodIterator MethodEnd,
+                                    bool IsInstanceMethod,
+                                    StringRef prefix,
+                                    StringRef ClassName,
+                                    std::string &Result);
+    void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
+                                     StringRef prefix, StringRef ClassName,
+                                     std::string &Result) override;
+    void RewriteObjCProtocolListMetaData(
+          const ObjCList<ObjCProtocolDecl> &Prots,
+          StringRef prefix, StringRef ClassName, std::string &Result) override;
+    void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                  std::string &Result) override;
+    void RewriteMetaDataIntoBuffer(std::string &Result) override;
+    void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
+                                     std::string &Result) override;
+
+    // Rewriting ivar
+    void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                      std::string &Result) override;
+    Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) override;
+  };
+} // end anonymous namespace
+
+void RewriteObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
+                                                   NamedDecl *D) {
+  if (const FunctionProtoType *fproto
+      = dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
+    for (const auto &I : fproto->param_types())
+      if (isTopLevelBlockPointerType(I)) {
+        // All the args are checked/rewritten. Don't call twice!
+        RewriteBlockPointerDecl(D);
+        break;
+      }
+  }
+}
+
+void RewriteObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
+  const PointerType *PT = funcType->getAs<PointerType>();
+  if (PT && PointerTypeTakesAnyBlockArguments(funcType))
+    RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
+}
+
+static bool IsHeaderFile(const std::string &Filename) {
+  std::string::size_type DotPos = Filename.rfind('.');
+
+  if (DotPos == std::string::npos) {
+    // no file extension
+    return false;
+  }
+
+  std::string Ext = Filename.substr(DotPos + 1);
+  // C header: .h
+  // C++ header: .hh or .H;
+  return Ext == "h" || Ext == "hh" || Ext == "H";
+}
+
+RewriteObjC::RewriteObjC(std::string inFile, std::unique_ptr<raw_ostream> OS,
+                         DiagnosticsEngine &D, const LangOptions &LOpts,
+                         bool silenceMacroWarn)
+    : Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(std::move(OS)),
+      SilenceRewriteMacroWarning(silenceMacroWarn) {
+  IsHeader = IsHeaderFile(inFile);
+  RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
+               "rewriting sub-expression within a macro (may not be correct)");
+  TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
+               DiagnosticsEngine::Warning,
+               "rewriter doesn't support user-specified control flow semantics "
+               "for @try/@finally (code may not execute properly)");
+}
+
+std::unique_ptr<ASTConsumer>
+clang::CreateObjCRewriter(const std::string &InFile,
+                          std::unique_ptr<raw_ostream> OS,
+                          DiagnosticsEngine &Diags, const LangOptions &LOpts,
+                          bool SilenceRewriteMacroWarning) {
+  return std::make_unique<RewriteObjCFragileABI>(
+      InFile, std::move(OS), Diags, LOpts, SilenceRewriteMacroWarning);
+}
+
+void RewriteObjC::InitializeCommon(ASTContext &context) {
+  Context = &context;
+  SM = &Context->getSourceManager();
+  TUDecl = Context->getTranslationUnitDecl();
+  MsgSendFunctionDecl = nullptr;
+  MsgSendSuperFunctionDecl = nullptr;
+  MsgSendStretFunctionDecl = nullptr;
+  MsgSendSuperStretFunctionDecl = nullptr;
+  MsgSendFpretFunctionDecl = nullptr;
+  GetClassFunctionDecl = nullptr;
+  GetMetaClassFunctionDecl = nullptr;
+  GetSuperClassFunctionDecl = nullptr;
+  SelGetUidFunctionDecl = nullptr;
+  CFStringFunctionDecl = nullptr;
+  ConstantStringClassReference = nullptr;
+  NSStringRecord = nullptr;
+  CurMethodDef = nullptr;
+  CurFunctionDef = nullptr;
+  CurFunctionDeclToDeclareForBlock = nullptr;
+  GlobalVarDecl = nullptr;
+  SuperStructDecl = nullptr;
+  ProtocolTypeDecl = nullptr;
+  ConstantStringDecl = nullptr;
+  BcLabelCount = 0;
+  SuperConstructorFunctionDecl = nullptr;
+  NumObjCStringLiterals = 0;
+  PropParentMap = nullptr;
+  CurrentBody = nullptr;
+  DisableReplaceStmt = false;
+  objc_impl_method = false;
+
+  // Get the ID and start/end of the main file.
+  MainFileID = SM->getMainFileID();
+  llvm::MemoryBufferRef MainBuf = SM->getBufferOrFake(MainFileID);
+  MainFileStart = MainBuf.getBufferStart();
+  MainFileEnd = MainBuf.getBufferEnd();
+
+  Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
+}
+
+//===----------------------------------------------------------------------===//
+// Top Level Driver Code
+//===----------------------------------------------------------------------===//
+
+void RewriteObjC::HandleTopLevelSingleDecl(Decl *D) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+  // Two cases: either the decl could be in the main file, or it could be in a
+  // #included file.  If the former, rewrite it now.  If the later, check to see
+  // if we rewrote the #include/#import.
+  SourceLocation Loc = D->getLocation();
+  Loc = SM->getExpansionLoc(Loc);
+
+  // If this is for a builtin, ignore it.
+  if (Loc.isInvalid()) return;
+
+  // Look for built-in declarations that we need to refer during the rewrite.
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+    RewriteFunctionDecl(FD);
+  } else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
+    // declared in <Foundation/NSString.h>
+    if (FVD->getName() == "_NSConstantStringClassReference") {
+      ConstantStringClassReference = FVD;
+      return;
+    }
+  } else if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
+    if (ID->isThisDeclarationADefinition())
+      RewriteInterfaceDecl(ID);
+  } else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
+    RewriteCategoryDecl(CD);
+  } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
+    if (PD->isThisDeclarationADefinition())
+      RewriteProtocolDecl(PD);
+  } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
+    // Recurse into linkage specifications
+    for (DeclContext::decl_iterator DI = LSD->decls_begin(),
+                                 DIEnd = LSD->decls_end();
+         DI != DIEnd; ) {
+      if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>((*DI))) {
+        if (!IFace->isThisDeclarationADefinition()) {
+          SmallVector<Decl *, 8> DG;
+          SourceLocation StartLoc = IFace->getBeginLoc();
+          do {
+            if (isa<ObjCInterfaceDecl>(*DI) &&
+                !cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
+                StartLoc == (*DI)->getBeginLoc())
+              DG.push_back(*DI);
+            else
+              break;
+
+            ++DI;
+          } while (DI != DIEnd);
+          RewriteForwardClassDecl(DG);
+          continue;
+        }
+      }
+
+      if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>((*DI))) {
+        if (!Proto->isThisDeclarationADefinition()) {
+          SmallVector<Decl *, 8> DG;
+          SourceLocation StartLoc = Proto->getBeginLoc();
+          do {
+            if (isa<ObjCProtocolDecl>(*DI) &&
+                !cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
+                StartLoc == (*DI)->getBeginLoc())
+              DG.push_back(*DI);
+            else
+              break;
+
+            ++DI;
+          } while (DI != DIEnd);
+          RewriteForwardProtocolDecl(DG);
+          continue;
+        }
+      }
+
+      HandleTopLevelSingleDecl(*DI);
+      ++DI;
+    }
+  }
+  // If we have a decl in the main file, see if we should rewrite it.
+  if (SM->isWrittenInMainFile(Loc))
+    return HandleDeclInMainFile(D);
+}
+
+//===----------------------------------------------------------------------===//
+// Syntactic (non-AST) Rewriting Code
+//===----------------------------------------------------------------------===//
+
+void RewriteObjC::RewriteInclude() {
+  SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
+  StringRef MainBuf = SM->getBufferData(MainFileID);
+  const char *MainBufStart = MainBuf.begin();
+  const char *MainBufEnd = MainBuf.end();
+  size_t ImportLen = strlen("import");
+
+  // Loop over the whole file, looking for includes.
+  for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
+    if (*BufPtr == '#') {
+      if (++BufPtr == MainBufEnd)
+        return;
+      while (*BufPtr == ' ' || *BufPtr == '\t')
+        if (++BufPtr == MainBufEnd)
+          return;
+      if (!strncmp(BufPtr, "import", ImportLen)) {
+        // replace import with include
+        SourceLocation ImportLoc =
+          LocStart.getLocWithOffset(BufPtr-MainBufStart);
+        ReplaceText(ImportLoc, ImportLen, "include");
+        BufPtr += ImportLen;
+      }
+    }
+  }
+}
+
+static std::string getIvarAccessString(ObjCIvarDecl *OID) {
+  const ObjCInterfaceDecl *ClassDecl = OID->getContainingInterface();
+  std::string S;
+  S = "((struct ";
+  S += ClassDecl->getIdentifier()->getName();
+  S += "_IMPL *)self)->";
+  S += OID->getName();
+  return S;
+}
+
+void RewriteObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
+                                          ObjCImplementationDecl *IMD,
+                                          ObjCCategoryImplDecl *CID) {
+  static bool objcGetPropertyDefined = false;
+  static bool objcSetPropertyDefined = false;
+  SourceLocation startLoc = PID->getBeginLoc();
+  InsertText(startLoc, "// ");
+  const char *startBuf = SM->getCharacterData(startLoc);
+  assert((*startBuf == '@') && "bogus @synthesize location");
+  const char *semiBuf = strchr(startBuf, ';');
+  assert((*semiBuf == ';') && "@synthesize: can't find ';'");
+  SourceLocation onePastSemiLoc =
+    startLoc.getLocWithOffset(semiBuf-startBuf+1);
+
+  if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+    return; // FIXME: is this correct?
+
+  // Generate the 'getter' function.
+  ObjCPropertyDecl *PD = PID->getPropertyDecl();
+  ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
+
+  if (!OID)
+    return;
+
+  unsigned Attributes = PD->getPropertyAttributes();
+  if (PID->getGetterMethodDecl() && !PID->getGetterMethodDecl()->isDefined()) {
+    bool GenGetProperty =
+        !(Attributes & ObjCPropertyAttribute::kind_nonatomic) &&
+        (Attributes & (ObjCPropertyAttribute::kind_retain |
+                       ObjCPropertyAttribute::kind_copy));
+    std::string Getr;
+    if (GenGetProperty && !objcGetPropertyDefined) {
+      objcGetPropertyDefined = true;
+      // FIXME. Is this attribute correct in all cases?
+      Getr = "\nextern \"C\" __declspec(dllimport) "
+            "id objc_getProperty(id, SEL, long, bool);\n";
+    }
+    RewriteObjCMethodDecl(OID->getContainingInterface(),
+                          PID->getGetterMethodDecl(), Getr);
+    Getr += "{ ";
+    // Synthesize an explicit cast to gain access to the ivar.
+    // See objc-act.c:objc_synthesize_new_getter() for details.
+    if (GenGetProperty) {
+      // return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
+      Getr += "typedef ";
+      const FunctionType *FPRetType = nullptr;
+      RewriteTypeIntoString(PID->getGetterMethodDecl()->getReturnType(), Getr,
+                            FPRetType);
+      Getr += " _TYPE";
+      if (FPRetType) {
+        Getr += ")"; // close the precedence "scope" for "*".
+
+        // Now, emit the argument types (if any).
+        if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
+          Getr += "(";
+          for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
+            if (i) Getr += ", ";
+            std::string ParamStr =
+                FT->getParamType(i).getAsString(Context->getPrintingPolicy());
+            Getr += ParamStr;
+          }
+          if (FT->isVariadic()) {
+            if (FT->getNumParams())
+              Getr += ", ";
+            Getr += "...";
+          }
+          Getr += ")";
+        } else
+          Getr += "()";
+      }
+      Getr += ";\n";
+      Getr += "return (_TYPE)";
+      Getr += "objc_getProperty(self, _cmd, ";
+      RewriteIvarOffsetComputation(OID, Getr);
+      Getr += ", 1)";
+    }
+    else
+      Getr += "return " + getIvarAccessString(OID);
+    Getr += "; }";
+    InsertText(onePastSemiLoc, Getr);
+  }
+
+  if (PD->isReadOnly() || !PID->getSetterMethodDecl() ||
+      PID->getSetterMethodDecl()->isDefined())
+    return;
+
+  // Generate the 'setter' function.
+  std::string Setr;
+  bool GenSetProperty = Attributes & (ObjCPropertyAttribute::kind_retain |
+                                      ObjCPropertyAttribute::kind_copy);
+  if (GenSetProperty && !objcSetPropertyDefined) {
+    objcSetPropertyDefined = true;
+    // FIXME. Is this attribute correct in all cases?
+    Setr = "\nextern \"C\" __declspec(dllimport) "
+    "void objc_setProperty (id, SEL, long, id, bool, bool);\n";
+  }
+
+  RewriteObjCMethodDecl(OID->getContainingInterface(),
+                        PID->getSetterMethodDecl(), Setr);
+  Setr += "{ ";
+  // Synthesize an explicit cast to initialize the ivar.
+  // See objc-act.c:objc_synthesize_new_setter() for details.
+  if (GenSetProperty) {
+    Setr += "objc_setProperty (self, _cmd, ";
+    RewriteIvarOffsetComputation(OID, Setr);
+    Setr += ", (id)";
+    Setr += PD->getName();
+    Setr += ", ";
+    if (Attributes & ObjCPropertyAttribute::kind_nonatomic)
+      Setr += "0, ";
+    else
+      Setr += "1, ";
+    if (Attributes & ObjCPropertyAttribute::kind_copy)
+      Setr += "1)";
+    else
+      Setr += "0)";
+  }
+  else {
+    Setr += getIvarAccessString(OID) + " = ";
+    Setr += PD->getName();
+  }
+  Setr += "; }";
+  InsertText(onePastSemiLoc, Setr);
+}
+
+static void RewriteOneForwardClassDecl(ObjCInterfaceDecl *ForwardDecl,
+                                       std::string &typedefString) {
+  typedefString += "#ifndef _REWRITER_typedef_";
+  typedefString += ForwardDecl->getNameAsString();
+  typedefString += "\n";
+  typedefString += "#define _REWRITER_typedef_";
+  typedefString += ForwardDecl->getNameAsString();
+  typedefString += "\n";
+  typedefString += "typedef struct objc_object ";
+  typedefString += ForwardDecl->getNameAsString();
+  typedefString += ";\n#endif\n";
+}
+
+void RewriteObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
+                                              const std::string &typedefString) {
+  SourceLocation startLoc = ClassDecl->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+  const char *semiPtr = strchr(startBuf, ';');
+  // Replace the @class with typedefs corresponding to the classes.
+  ReplaceText(startLoc, semiPtr - startBuf + 1, typedefString);
+}
+
+void RewriteObjC::RewriteForwardClassDecl(DeclGroupRef D) {
+  std::string typedefString;
+  for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
+    ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(*I);
+    if (I == D.begin()) {
+      // Translate to typedef's that forward reference structs with the same name
+      // as the class. As a convenience, we include the original declaration
+      // as a comment.
+      typedefString += "// @class ";
+      typedefString += ForwardDecl->getNameAsString();
+      typedefString += ";\n";
+    }
+    RewriteOneForwardClassDecl(ForwardDecl, typedefString);
+  }
+  DeclGroupRef::iterator I = D.begin();
+  RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(*I), typedefString);
+}
+
+void RewriteObjC::RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &D) {
+  std::string typedefString;
+  for (unsigned i = 0; i < D.size(); i++) {
+    ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(D[i]);
+    if (i == 0) {
+      typedefString += "// @class ";
+      typedefString += ForwardDecl->getNameAsString();
+      typedefString += ";\n";
+    }
+    RewriteOneForwardClassDecl(ForwardDecl, typedefString);
+  }
+  RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(D[0]), typedefString);
+}
+
+void RewriteObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
+  // When method is a synthesized one, such as a getter/setter there is
+  // nothing to rewrite.
+  if (Method->isImplicit())
+    return;
+  SourceLocation LocStart = Method->getBeginLoc();
+  SourceLocation LocEnd = Method->getEndLoc();
+
+  if (SM->getExpansionLineNumber(LocEnd) >
+      SM->getExpansionLineNumber(LocStart)) {
+    InsertText(LocStart, "#if 0\n");
+    ReplaceText(LocEnd, 1, ";\n#endif\n");
+  } else {
+    InsertText(LocStart, "// ");
+  }
+}
+
+void RewriteObjC::RewriteProperty(ObjCPropertyDecl *prop) {
+  SourceLocation Loc = prop->getAtLoc();
+
+  ReplaceText(Loc, 0, "// ");
+  // FIXME: handle properties that are declared across multiple lines.
+}
+
+void RewriteObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
+  SourceLocation LocStart = CatDecl->getBeginLoc();
+
+  // FIXME: handle category headers that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+
+  for (auto *I : CatDecl->instance_properties())
+    RewriteProperty(I);
+  for (auto *I : CatDecl->instance_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : CatDecl->class_methods())
+    RewriteMethodDeclaration(I);
+
+  // Lastly, comment out the @end.
+  ReplaceText(CatDecl->getAtEndRange().getBegin(),
+              strlen("@end"), "/* @end */");
+}
+
+void RewriteObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
+  SourceLocation LocStart = PDecl->getBeginLoc();
+  assert(PDecl->isThisDeclarationADefinition());
+
+  // FIXME: handle protocol headers that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+
+  for (auto *I : PDecl->instance_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : PDecl->class_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : PDecl->instance_properties())
+    RewriteProperty(I);
+
+  // Lastly, comment out the @end.
+  SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
+  ReplaceText(LocEnd, strlen("@end"), "/* @end */");
+
+  // Must comment out @optional/@required
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+  for (const char *p = startBuf; p < endBuf; p++) {
+    if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
+      SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
+      ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
+
+    }
+    else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
+      SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
+      ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
+
+    }
+  }
+}
+
+void RewriteObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
+  SourceLocation LocStart = (*D.begin())->getBeginLoc();
+  if (LocStart.isInvalid())
+    llvm_unreachable("Invalid SourceLocation");
+  // FIXME: handle forward protocol that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+}
+
+void
+RewriteObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
+  SourceLocation LocStart = DG[0]->getBeginLoc();
+  if (LocStart.isInvalid())
+    llvm_unreachable("Invalid SourceLocation");
+  // FIXME: handle forward protocol that are declared across multiple lines.
+  ReplaceText(LocStart, 0, "// ");
+}
+
+void RewriteObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
+                                        const FunctionType *&FPRetType) {
+  if (T->isObjCQualifiedIdType())
+    ResultStr += "id";
+  else if (T->isFunctionPointerType() ||
+           T->isBlockPointerType()) {
+    // needs special handling, since pointer-to-functions have special
+    // syntax (where a decaration models use).
+    QualType retType = T;
+    QualType PointeeTy;
+    if (const PointerType* PT = retType->getAs<PointerType>())
+      PointeeTy = PT->getPointeeType();
+    else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
+      PointeeTy = BPT->getPointeeType();
+    if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
+      ResultStr +=
+          FPRetType->getReturnType().getAsString(Context->getPrintingPolicy());
+      ResultStr += "(*";
+    }
+  } else
+    ResultStr += T.getAsString(Context->getPrintingPolicy());
+}
+
+void RewriteObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
+                                        ObjCMethodDecl *OMD,
+                                        std::string &ResultStr) {
+  //fprintf(stderr,"In RewriteObjCMethodDecl\n");
+  const FunctionType *FPRetType = nullptr;
+  ResultStr += "\nstatic ";
+  RewriteTypeIntoString(OMD->getReturnType(), ResultStr, FPRetType);
+  ResultStr += " ";
+
+  // Unique method name
+  std::string NameStr;
+
+  if (OMD->isInstanceMethod())
+    NameStr += "_I_";
+  else
+    NameStr += "_C_";
+
+  NameStr += IDecl->getNameAsString();
+  NameStr += "_";
+
+  if (ObjCCategoryImplDecl *CID =
+      dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
+    NameStr += CID->getNameAsString();
+    NameStr += "_";
+  }
+  // Append selector names, replacing ':' with '_'
+  {
+    std::string selString = OMD->getSelector().getAsString();
+    int len = selString.size();
+    for (int i = 0; i < len; i++)
+      if (selString[i] == ':')
+        selString[i] = '_';
+    NameStr += selString;
+  }
+  // Remember this name for metadata emission
+  MethodInternalNames[OMD] = NameStr;
+  ResultStr += NameStr;
+
+  // Rewrite arguments
+  ResultStr += "(";
+
+  // invisible arguments
+  if (OMD->isInstanceMethod()) {
+    QualType selfTy = Context->getObjCInterfaceType(IDecl);
+    selfTy = Context->getPointerType(selfTy);
+    if (!LangOpts.MicrosoftExt) {
+      if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
+        ResultStr += "struct ";
+    }
+    // When rewriting for Microsoft, explicitly omit the structure name.
+    ResultStr += IDecl->getNameAsString();
+    ResultStr += " *";
+  }
+  else
+    ResultStr += Context->getObjCClassType().getAsString(
+      Context->getPrintingPolicy());
+
+  ResultStr += " self, ";
+  ResultStr += Context->getObjCSelType().getAsString(Context->getPrintingPolicy());
+  ResultStr += " _cmd";
+
+  // Method arguments.
+  for (const auto *PDecl : OMD->parameters()) {
+    ResultStr += ", ";
+    if (PDecl->getType()->isObjCQualifiedIdType()) {
+      ResultStr += "id ";
+      ResultStr += PDecl->getNameAsString();
+    } else {
+      std::string Name = PDecl->getNameAsString();
+      QualType QT = PDecl->getType();
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(QT);
+      QT.getAsStringInternal(Name, Context->getPrintingPolicy());
+      ResultStr += Name;
+    }
+  }
+  if (OMD->isVariadic())
+    ResultStr += ", ...";
+  ResultStr += ") ";
+
+  if (FPRetType) {
+    ResultStr += ")"; // close the precedence "scope" for "*".
+
+    // Now, emit the argument types (if any).
+    if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
+      ResultStr += "(";
+      for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
+        if (i) ResultStr += ", ";
+        std::string ParamStr =
+            FT->getParamType(i).getAsString(Context->getPrintingPolicy());
+        ResultStr += ParamStr;
+      }
+      if (FT->isVariadic()) {
+        if (FT->getNumParams())
+          ResultStr += ", ";
+        ResultStr += "...";
+      }
+      ResultStr += ")";
+    } else {
+      ResultStr += "()";
+    }
+  }
+}
+
+void RewriteObjC::RewriteImplementationDecl(Decl *OID) {
+  ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
+  ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
+  assert((IMD || CID) && "Unknown ImplementationDecl");
+
+  InsertText(IMD ? IMD->getBeginLoc() : CID->getBeginLoc(), "// ");
+
+  for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
+    if (!OMD->getBody())
+      continue;
+    std::string ResultStr;
+    RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
+    SourceLocation LocStart = OMD->getBeginLoc();
+    SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
+
+    const char *startBuf = SM->getCharacterData(LocStart);
+    const char *endBuf = SM->getCharacterData(LocEnd);
+    ReplaceText(LocStart, endBuf-startBuf, ResultStr);
+  }
+
+  for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
+    if (!OMD->getBody())
+      continue;
+    std::string ResultStr;
+    RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
+    SourceLocation LocStart = OMD->getBeginLoc();
+    SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
+
+    const char *startBuf = SM->getCharacterData(LocStart);
+    const char *endBuf = SM->getCharacterData(LocEnd);
+    ReplaceText(LocStart, endBuf-startBuf, ResultStr);
+  }
+  for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
+    RewritePropertyImplDecl(I, IMD, CID);
+
+  InsertText(IMD ? IMD->getEndLoc() : CID->getEndLoc(), "// ");
+}
+
+void RewriteObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
+  std::string ResultStr;
+  if (!ObjCForwardDecls.count(ClassDecl->getCanonicalDecl())) {
+    // we haven't seen a forward decl - generate a typedef.
+    ResultStr = "#ifndef _REWRITER_typedef_";
+    ResultStr += ClassDecl->getNameAsString();
+    ResultStr += "\n";
+    ResultStr += "#define _REWRITER_typedef_";
+    ResultStr += ClassDecl->getNameAsString();
+    ResultStr += "\n";
+    ResultStr += "typedef struct objc_object ";
+    ResultStr += ClassDecl->getNameAsString();
+    ResultStr += ";\n#endif\n";
+    // Mark this typedef as having been generated.
+    ObjCForwardDecls.insert(ClassDecl->getCanonicalDecl());
+  }
+  RewriteObjCInternalStruct(ClassDecl, ResultStr);
+
+  for (auto *I : ClassDecl->instance_properties())
+    RewriteProperty(I);
+  for (auto *I : ClassDecl->instance_methods())
+    RewriteMethodDeclaration(I);
+  for (auto *I : ClassDecl->class_methods())
+    RewriteMethodDeclaration(I);
+
+  // Lastly, comment out the @end.
+  ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
+              "/* @end */");
+}
+
+Stmt *RewriteObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
+  SourceRange OldRange = PseudoOp->getSourceRange();
+
+  // We just magically know some things about the structure of this
+  // expression.
+  ObjCMessageExpr *OldMsg =
+    cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
+                            PseudoOp->getNumSemanticExprs() - 1));
+
+  // Because the rewriter doesn't allow us to rewrite rewritten code,
+  // we need to suppress rewriting the sub-statements.
+  Expr *Base, *RHS;
+  {
+    DisableReplaceStmtScope S(*this);
+
+    // Rebuild the base expression if we have one.
+    Base = nullptr;
+    if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
+      Base = OldMsg->getInstanceReceiver();
+      Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
+      Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
+    }
+
+    // Rebuild the RHS.
+    RHS = cast<BinaryOperator>(PseudoOp->getSyntacticForm())->getRHS();
+    RHS = cast<OpaqueValueExpr>(RHS)->getSourceExpr();
+    RHS = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(RHS));
+  }
+
+  // TODO: avoid this copy.
+  SmallVector<SourceLocation, 1> SelLocs;
+  OldMsg->getSelectorLocs(SelLocs);
+
+  ObjCMessageExpr *NewMsg = nullptr;
+  switch (OldMsg->getReceiverKind()) {
+  case ObjCMessageExpr::Class:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getClassReceiverTypeInfo(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     RHS,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::Instance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     Base,
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     RHS,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::SuperClass:
+  case ObjCMessageExpr::SuperInstance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getSuperLoc(),
+                 OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
+                                     OldMsg->getSuperType(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     RHS,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+  }
+
+  Stmt *Replacement = SynthMessageExpr(NewMsg);
+  ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
+  return Replacement;
+}
+
+Stmt *RewriteObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
+  SourceRange OldRange = PseudoOp->getSourceRange();
+
+  // We just magically know some things about the structure of this
+  // expression.
+  ObjCMessageExpr *OldMsg =
+    cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
+
+  // Because the rewriter doesn't allow us to rewrite rewritten code,
+  // we need to suppress rewriting the sub-statements.
+  Expr *Base = nullptr;
+  {
+    DisableReplaceStmtScope S(*this);
+
+    // Rebuild the base expression if we have one.
+    if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
+      Base = OldMsg->getInstanceReceiver();
+      Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
+      Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
+    }
+  }
+
+  // Intentionally empty.
+  SmallVector<SourceLocation, 1> SelLocs;
+  SmallVector<Expr*, 1> Args;
+
+  ObjCMessageExpr *NewMsg = nullptr;
+  switch (OldMsg->getReceiverKind()) {
+  case ObjCMessageExpr::Class:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getClassReceiverTypeInfo(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::Instance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     Base,
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+
+  case ObjCMessageExpr::SuperClass:
+  case ObjCMessageExpr::SuperInstance:
+    NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
+                                     OldMsg->getValueKind(),
+                                     OldMsg->getLeftLoc(),
+                                     OldMsg->getSuperLoc(),
+                 OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
+                                     OldMsg->getSuperType(),
+                                     OldMsg->getSelector(),
+                                     SelLocs,
+                                     OldMsg->getMethodDecl(),
+                                     Args,
+                                     OldMsg->getRightLoc(),
+                                     OldMsg->isImplicit());
+    break;
+  }
+
+  Stmt *Replacement = SynthMessageExpr(NewMsg);
+  ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
+  return Replacement;
+}
+
+/// SynthCountByEnumWithState - To print:
+/// ((unsigned int (*)
+///  (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
+///  (void *)objc_msgSend)((id)l_collection,
+///                        sel_registerName(
+///                          "countByEnumeratingWithState:objects:count:"),
+///                        &enumState,
+///                        (id *)__rw_items, (unsigned int)16)
+///
+void RewriteObjC::SynthCountByEnumWithState(std::string &buf) {
+  buf += "((unsigned int (*) (id, SEL, struct __objcFastEnumerationState *, "
+  "id *, unsigned int))(void *)objc_msgSend)";
+  buf += "\n\t\t";
+  buf += "((id)l_collection,\n\t\t";
+  buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
+  buf += "\n\t\t";
+  buf += "&enumState, "
+         "(id *)__rw_items, (unsigned int)16)";
+}
+
+/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
+/// statement to exit to its outer synthesized loop.
+///
+Stmt *RewriteObjC::RewriteBreakStmt(BreakStmt *S) {
+  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
+    return S;
+  // replace break with goto __break_label
+  std::string buf;
+
+  SourceLocation startLoc = S->getBeginLoc();
+  buf = "goto __break_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  ReplaceText(startLoc, strlen("break"), buf);
+
+  return nullptr;
+}
+
+/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
+/// statement to continue with its inner synthesized loop.
+///
+Stmt *RewriteObjC::RewriteContinueStmt(ContinueStmt *S) {
+  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
+    return S;
+  // replace continue with goto __continue_label
+  std::string buf;
+
+  SourceLocation startLoc = S->getBeginLoc();
+  buf = "goto __continue_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  ReplaceText(startLoc, strlen("continue"), buf);
+
+  return nullptr;
+}
+
+/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
+///  It rewrites:
+/// for ( type elem in collection) { stmts; }
+
+/// Into:
+/// {
+///   type elem;
+///   struct __objcFastEnumerationState enumState = { 0 };
+///   id __rw_items[16];
+///   id l_collection = (id)collection;
+///   unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
+///                                       objects:__rw_items count:16];
+/// if (limit) {
+///   unsigned long startMutations = *enumState.mutationsPtr;
+///   do {
+///        unsigned long counter = 0;
+///        do {
+///             if (startMutations != *enumState.mutationsPtr)
+///               objc_enumerationMutation(l_collection);
+///             elem = (type)enumState.itemsPtr[counter++];
+///             stmts;
+///             __continue_label: ;
+///        } while (counter < limit);
+///   } while (limit = [l_collection countByEnumeratingWithState:&enumState
+///                                  objects:__rw_items count:16]);
+///   elem = nil;
+///   __break_label: ;
+///  }
+///  else
+///       elem = nil;
+///  }
+///
+Stmt *RewriteObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
+                                                SourceLocation OrigEnd) {
+  assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
+  assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
+         "ObjCForCollectionStmt Statement stack mismatch");
+  assert(!ObjCBcLabelNo.empty() &&
+         "ObjCForCollectionStmt - Label No stack empty");
+
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+  StringRef elementName;
+  std::string elementTypeAsString;
+  std::string buf;
+  buf = "\n{\n\t";
+  if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
+    // type elem;
+    NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
+    QualType ElementType = cast<ValueDecl>(D)->getType();
+    if (ElementType->isObjCQualifiedIdType() ||
+        ElementType->isObjCQualifiedInterfaceType())
+      // Simply use 'id' for all qualified types.
+      elementTypeAsString = "id";
+    else
+      elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
+    buf += elementTypeAsString;
+    buf += " ";
+    elementName = D->getName();
+    buf += elementName;
+    buf += ";\n\t";
+  }
+  else {
+    DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
+    elementName = DR->getDecl()->getName();
+    ValueDecl *VD = DR->getDecl();
+    if (VD->getType()->isObjCQualifiedIdType() ||
+        VD->getType()->isObjCQualifiedInterfaceType())
+      // Simply use 'id' for all qualified types.
+      elementTypeAsString = "id";
+    else
+      elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
+  }
+
+  // struct __objcFastEnumerationState enumState = { 0 };
+  buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
+  // id __rw_items[16];
+  buf += "id __rw_items[16];\n\t";
+  // id l_collection = (id)
+  buf += "id l_collection = (id)";
+  // Find start location of 'collection' the hard way!
+  const char *startCollectionBuf = startBuf;
+  startCollectionBuf += 3;  // skip 'for'
+  startCollectionBuf = strchr(startCollectionBuf, '(');
+  startCollectionBuf++; // skip '('
+  // find 'in' and skip it.
+  while (*startCollectionBuf != ' ' ||
+         *(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
+         (*(startCollectionBuf+3) != ' ' &&
+          *(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
+    startCollectionBuf++;
+  startCollectionBuf += 3;
+
+  // Replace: "for (type element in" with string constructed thus far.
+  ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
+  // Replace ')' in for '(' type elem in collection ')' with ';'
+  SourceLocation rightParenLoc = S->getRParenLoc();
+  const char *rparenBuf = SM->getCharacterData(rightParenLoc);
+  SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
+  buf = ";\n\t";
+
+  // unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
+  //                                   objects:__rw_items count:16];
+  // which is synthesized into:
+  // unsigned int limit =
+  // ((unsigned int (*)
+  //  (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
+  //  (void *)objc_msgSend)((id)l_collection,
+  //                        sel_registerName(
+  //                          "countByEnumeratingWithState:objects:count:"),
+  //                        (struct __objcFastEnumerationState *)&state,
+  //                        (id *)__rw_items, (unsigned int)16);
+  buf += "unsigned long limit =\n\t\t";
+  SynthCountByEnumWithState(buf);
+  buf += ";\n\t";
+  /// if (limit) {
+  ///   unsigned long startMutations = *enumState.mutationsPtr;
+  ///   do {
+  ///        unsigned long counter = 0;
+  ///        do {
+  ///             if (startMutations != *enumState.mutationsPtr)
+  ///               objc_enumerationMutation(l_collection);
+  ///             elem = (type)enumState.itemsPtr[counter++];
+  buf += "if (limit) {\n\t";
+  buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
+  buf += "do {\n\t\t";
+  buf += "unsigned long counter = 0;\n\t\t";
+  buf += "do {\n\t\t\t";
+  buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
+  buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
+  buf += elementName;
+  buf += " = (";
+  buf += elementTypeAsString;
+  buf += ")enumState.itemsPtr[counter++];";
+  // Replace ')' in for '(' type elem in collection ')' with all of these.
+  ReplaceText(lparenLoc, 1, buf);
+
+  ///            __continue_label: ;
+  ///        } while (counter < limit);
+  ///   } while (limit = [l_collection countByEnumeratingWithState:&enumState
+  ///                                  objects:__rw_items count:16]);
+  ///   elem = nil;
+  ///   __break_label: ;
+  ///  }
+  ///  else
+  ///       elem = nil;
+  ///  }
+  ///
+  buf = ";\n\t";
+  buf += "__continue_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  buf += ": ;";
+  buf += "\n\t\t";
+  buf += "} while (counter < limit);\n\t";
+  buf += "} while (limit = ";
+  SynthCountByEnumWithState(buf);
+  buf += ");\n\t";
+  buf += elementName;
+  buf += " = ((";
+  buf += elementTypeAsString;
+  buf += ")0);\n\t";
+  buf += "__break_label_";
+  buf += utostr(ObjCBcLabelNo.back());
+  buf += ": ;\n\t";
+  buf += "}\n\t";
+  buf += "else\n\t\t";
+  buf += elementName;
+  buf += " = ((";
+  buf += elementTypeAsString;
+  buf += ")0);\n\t";
+  buf += "}\n";
+
+  // Insert all these *after* the statement body.
+  // FIXME: If this should support Obj-C++, support CXXTryStmt
+  if (isa<CompoundStmt>(S->getBody())) {
+    SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
+    InsertText(endBodyLoc, buf);
+  } else {
+    /* Need to treat single statements specially. For example:
+     *
+     *     for (A *a in b) if (stuff()) break;
+     *     for (A *a in b) xxxyy;
+     *
+     * The following code simply scans ahead to the semi to find the actual end.
+     */
+    const char *stmtBuf = SM->getCharacterData(OrigEnd);
+    const char *semiBuf = strchr(stmtBuf, ';');
+    assert(semiBuf && "Can't find ';'");
+    SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
+    InsertText(endBodyLoc, buf);
+  }
+  Stmts.pop_back();
+  ObjCBcLabelNo.pop_back();
+  return nullptr;
+}
+
+/// RewriteObjCSynchronizedStmt -
+/// This routine rewrites @synchronized(expr) stmt;
+/// into:
+/// objc_sync_enter(expr);
+/// @try stmt @finally { objc_sync_exit(expr); }
+///
+Stmt *RewriteObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @synchronized location");
+
+  std::string buf;
+  buf = "objc_sync_enter((id)";
+  const char *lparenBuf = startBuf;
+  while (*lparenBuf != '(') lparenBuf++;
+  ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
+  // We can't use S->getSynchExpr()->getEndLoc() to find the end location, since
+  // the sync expression is typically a message expression that's already
+  // been rewritten! (which implies the SourceLocation's are invalid).
+  SourceLocation endLoc = S->getSynchBody()->getBeginLoc();
+  const char *endBuf = SM->getCharacterData(endLoc);
+  while (*endBuf != ')') endBuf--;
+  SourceLocation rparenLoc = startLoc.getLocWithOffset(endBuf-startBuf);
+  buf = ");\n";
+  // declare a new scope with two variables, _stack and _rethrow.
+  buf += "/* @try scope begin */ \n{ struct _objc_exception_data {\n";
+  buf += "int buf[18/*32-bit i386*/];\n";
+  buf += "char *pointers[4];} _stack;\n";
+  buf += "id volatile _rethrow = 0;\n";
+  buf += "objc_exception_try_enter(&_stack);\n";
+  buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
+  ReplaceText(rparenLoc, 1, buf);
+  startLoc = S->getSynchBody()->getEndLoc();
+  startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '}') && "bogus @synchronized block");
+  SourceLocation lastCurlyLoc = startLoc;
+  buf = "}\nelse {\n";
+  buf += "  _rethrow = objc_exception_extract(&_stack);\n";
+  buf += "}\n";
+  buf += "{ /* implicit finally clause */\n";
+  buf += "  if (!_rethrow) objc_exception_try_exit(&_stack);\n";
+
+  std::string syncBuf;
+  syncBuf += " objc_sync_exit(";
+
+  Expr *syncExpr = S->getSynchExpr();
+  CastKind CK = syncExpr->getType()->isObjCObjectPointerType()
+                  ? CK_BitCast :
+                syncExpr->getType()->isBlockPointerType()
+                  ? CK_BlockPointerToObjCPointerCast
+                  : CK_CPointerToObjCPointerCast;
+  syncExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                      CK, syncExpr);
+  std::string syncExprBufS;
+  llvm::raw_string_ostream syncExprBuf(syncExprBufS);
+  assert(syncExpr != nullptr && "Expected non-null Expr");
+  syncExpr->printPretty(syncExprBuf, nullptr, PrintingPolicy(LangOpts));
+  syncBuf += syncExprBuf.str();
+  syncBuf += ");";
+
+  buf += syncBuf;
+  buf += "\n  if (_rethrow) objc_exception_throw(_rethrow);\n";
+  buf += "}\n";
+  buf += "}";
+
+  ReplaceText(lastCurlyLoc, 1, buf);
+
+  bool hasReturns = false;
+  HasReturnStmts(S->getSynchBody(), hasReturns);
+  if (hasReturns)
+    RewriteSyncReturnStmts(S->getSynchBody(), syncBuf);
+
+  return nullptr;
+}
+
+void RewriteObjC::WarnAboutReturnGotoStmts(Stmt *S)
+{
+  // Perform a bottom up traversal of all children.
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt)
+      WarnAboutReturnGotoStmts(SubStmt);
+
+  if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
+    Diags.Report(Context->getFullLoc(S->getBeginLoc()),
+                 TryFinallyContainsReturnDiag);
+  }
+}
+
+void RewriteObjC::HasReturnStmts(Stmt *S, bool &hasReturns)
+{
+  // Perform a bottom up traversal of all children.
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt)
+      HasReturnStmts(SubStmt, hasReturns);
+
+  if (isa<ReturnStmt>(S))
+    hasReturns = true;
+}
+
+void RewriteObjC::RewriteTryReturnStmts(Stmt *S) {
+  // Perform a bottom up traversal of all children.
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt) {
+      RewriteTryReturnStmts(SubStmt);
+    }
+  if (isa<ReturnStmt>(S)) {
+    SourceLocation startLoc = S->getBeginLoc();
+    const char *startBuf = SM->getCharacterData(startLoc);
+    const char *semiBuf = strchr(startBuf, ';');
+    assert((*semiBuf == ';') && "RewriteTryReturnStmts: can't find ';'");
+    SourceLocation onePastSemiLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
+
+    std::string buf;
+    buf = "{ objc_exception_try_exit(&_stack); return";
+
+    ReplaceText(startLoc, 6, buf);
+    InsertText(onePastSemiLoc, "}");
+  }
+}
+
+void RewriteObjC::RewriteSyncReturnStmts(Stmt *S, std::string syncExitBuf) {
+  // Perform a bottom up traversal of all children.
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt) {
+      RewriteSyncReturnStmts(SubStmt, syncExitBuf);
+    }
+  if (isa<ReturnStmt>(S)) {
+    SourceLocation startLoc = S->getBeginLoc();
+    const char *startBuf = SM->getCharacterData(startLoc);
+
+    const char *semiBuf = strchr(startBuf, ';');
+    assert((*semiBuf == ';') && "RewriteSyncReturnStmts: can't find ';'");
+    SourceLocation onePastSemiLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
+
+    std::string buf;
+    buf = "{ objc_exception_try_exit(&_stack);";
+    buf += syncExitBuf;
+    buf += " return";
+
+    ReplaceText(startLoc, 6, buf);
+    InsertText(onePastSemiLoc, "}");
+  }
+}
+
+Stmt *RewriteObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @try location");
+
+  std::string buf;
+  // declare a new scope with two variables, _stack and _rethrow.
+  buf = "/* @try scope begin */ { struct _objc_exception_data {\n";
+  buf += "int buf[18/*32-bit i386*/];\n";
+  buf += "char *pointers[4];} _stack;\n";
+  buf += "id volatile _rethrow = 0;\n";
+  buf += "objc_exception_try_enter(&_stack);\n";
+  buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
+
+  ReplaceText(startLoc, 4, buf);
+
+  startLoc = S->getTryBody()->getEndLoc();
+  startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '}') && "bogus @try block");
+
+  SourceLocation lastCurlyLoc = startLoc;
+  if (S->getNumCatchStmts()) {
+    startLoc = startLoc.getLocWithOffset(1);
+    buf = " /* @catch begin */ else {\n";
+    buf += " id _caught = objc_exception_extract(&_stack);\n";
+    buf += " objc_exception_try_enter (&_stack);\n";
+    buf += " if (_setjmp(_stack.buf))\n";
+    buf += "   _rethrow = objc_exception_extract(&_stack);\n";
+    buf += " else { /* @catch continue */";
+
+    InsertText(startLoc, buf);
+  } else { /* no catch list */
+    buf = "}\nelse {\n";
+    buf += "  _rethrow = objc_exception_extract(&_stack);\n";
+    buf += "}";
+    ReplaceText(lastCurlyLoc, 1, buf);
+  }
+  Stmt *lastCatchBody = nullptr;
+  for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
+    ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
+    VarDecl *catchDecl = Catch->getCatchParamDecl();
+
+    if (I == 0)
+      buf = "if ("; // we are generating code for the first catch clause
+    else
+      buf = "else if (";
+    startLoc = Catch->getBeginLoc();
+    startBuf = SM->getCharacterData(startLoc);
+
+    assert((*startBuf == '@') && "bogus @catch location");
+
+    const char *lParenLoc = strchr(startBuf, '(');
+
+    if (Catch->hasEllipsis()) {
+      // Now rewrite the body...
+      lastCatchBody = Catch->getCatchBody();
+      SourceLocation bodyLoc = lastCatchBody->getBeginLoc();
+      const char *bodyBuf = SM->getCharacterData(bodyLoc);
+      assert(*SM->getCharacterData(Catch->getRParenLoc()) == ')' &&
+             "bogus @catch paren location");
+      assert((*bodyBuf == '{') && "bogus @catch body location");
+
+      buf += "1) { id _tmp = _caught;";
+      Rewrite.ReplaceText(startLoc, bodyBuf-startBuf+1, buf);
+    } else if (catchDecl) {
+      QualType t = catchDecl->getType();
+      if (t == Context->getObjCIdType()) {
+        buf += "1) { ";
+        ReplaceText(startLoc, lParenLoc-startBuf+1, buf);
+      } else if (const ObjCObjectPointerType *Ptr =
+                   t->getAs<ObjCObjectPointerType>()) {
+        // Should be a pointer to a class.
+        ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
+        if (IDecl) {
+          buf += "objc_exception_match((struct objc_class *)objc_getClass(\"";
+          buf += IDecl->getNameAsString();
+          buf += "\"), (struct objc_object *)_caught)) { ";
+          ReplaceText(startLoc, lParenLoc-startBuf+1, buf);
+        }
+      }
+      // Now rewrite the body...
+      lastCatchBody = Catch->getCatchBody();
+      SourceLocation rParenLoc = Catch->getRParenLoc();
+      SourceLocation bodyLoc = lastCatchBody->getBeginLoc();
+      const char *bodyBuf = SM->getCharacterData(bodyLoc);
+      const char *rParenBuf = SM->getCharacterData(rParenLoc);
+      assert((*rParenBuf == ')') && "bogus @catch paren location");
+      assert((*bodyBuf == '{') && "bogus @catch body location");
+
+      // Here we replace ") {" with "= _caught;" (which initializes and
+      // declares the @catch parameter).
+      ReplaceText(rParenLoc, bodyBuf-rParenBuf+1, " = _caught;");
+    } else {
+      llvm_unreachable("@catch rewrite bug");
+    }
+  }
+  // Complete the catch list...
+  if (lastCatchBody) {
+    SourceLocation bodyLoc = lastCatchBody->getEndLoc();
+    assert(*SM->getCharacterData(bodyLoc) == '}' &&
+           "bogus @catch body location");
+
+    // Insert the last (implicit) else clause *before* the right curly brace.
+    bodyLoc = bodyLoc.getLocWithOffset(-1);
+    buf = "} /* last catch end */\n";
+    buf += "else {\n";
+    buf += " _rethrow = _caught;\n";
+    buf += " objc_exception_try_exit(&_stack);\n";
+    buf += "} } /* @catch end */\n";
+    if (!S->getFinallyStmt())
+      buf += "}\n";
+    InsertText(bodyLoc, buf);
+
+    // Set lastCurlyLoc
+    lastCurlyLoc = lastCatchBody->getEndLoc();
+  }
+  if (ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt()) {
+    startLoc = finalStmt->getBeginLoc();
+    startBuf = SM->getCharacterData(startLoc);
+    assert((*startBuf == '@') && "bogus @finally start");
+
+    ReplaceText(startLoc, 8, "/* @finally */");
+
+    Stmt *body = finalStmt->getFinallyBody();
+    SourceLocation startLoc = body->getBeginLoc();
+    SourceLocation endLoc = body->getEndLoc();
+    assert(*SM->getCharacterData(startLoc) == '{' &&
+           "bogus @finally body location");
+    assert(*SM->getCharacterData(endLoc) == '}' &&
+           "bogus @finally body location");
+
+    startLoc = startLoc.getLocWithOffset(1);
+    InsertText(startLoc, " if (!_rethrow) objc_exception_try_exit(&_stack);\n");
+    endLoc = endLoc.getLocWithOffset(-1);
+    InsertText(endLoc, " if (_rethrow) objc_exception_throw(_rethrow);\n");
+
+    // Set lastCurlyLoc
+    lastCurlyLoc = body->getEndLoc();
+
+    // Now check for any return/continue/go statements within the @try.
+    WarnAboutReturnGotoStmts(S->getTryBody());
+  } else { /* no finally clause - make sure we synthesize an implicit one */
+    buf = "{ /* implicit finally clause */\n";
+    buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
+    buf += " if (_rethrow) objc_exception_throw(_rethrow);\n";
+    buf += "}";
+    ReplaceText(lastCurlyLoc, 1, buf);
+
+    // Now check for any return/continue/go statements within the @try.
+    // The implicit finally clause won't called if the @try contains any
+    // jump statements.
+    bool hasReturns = false;
+    HasReturnStmts(S->getTryBody(), hasReturns);
+    if (hasReturns)
+      RewriteTryReturnStmts(S->getTryBody());
+  }
+  // Now emit the final closing curly brace...
+  lastCurlyLoc = lastCurlyLoc.getLocWithOffset(1);
+  InsertText(lastCurlyLoc, " } /* @try scope end */\n");
+  return nullptr;
+}
+
+// This can't be done with ReplaceStmt(S, ThrowExpr), since
+// the throw expression is typically a message expression that's already
+// been rewritten! (which implies the SourceLocation's are invalid).
+Stmt *RewriteObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
+  // Get the start location and compute the semi location.
+  SourceLocation startLoc = S->getBeginLoc();
+  const char *startBuf = SM->getCharacterData(startLoc);
+
+  assert((*startBuf == '@') && "bogus @throw location");
+
+  std::string buf;
+  /* void objc_exception_throw(id) __attribute__((noreturn)); */
+  if (S->getThrowExpr())
+    buf = "objc_exception_throw(";
+  else // add an implicit argument
+    buf = "objc_exception_throw(_caught";
+
+  // handle "@  throw" correctly.
+  const char *wBuf = strchr(startBuf, 'w');
+  assert((*wBuf == 'w') && "@throw: can't find 'w'");
+  ReplaceText(startLoc, wBuf-startBuf+1, buf);
+
+  const char *semiBuf = strchr(startBuf, ';');
+  assert((*semiBuf == ';') && "@throw: can't find ';'");
+  SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
+  ReplaceText(semiLoc, 1, ");");
+  return nullptr;
+}
+
+Stmt *RewriteObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
+  // Create a new string expression.
+  std::string StrEncoding;
+  Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
+  Expr *Replacement = getStringLiteral(StrEncoding);
+  ReplaceStmt(Exp, Replacement);
+
+  // Replace this subexpr in the parent.
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return Replacement;
+}
+
+Stmt *RewriteObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
+  // Create a call to sel_registerName("selName").
+  SmallVector<Expr*, 8> SelExprs;
+  SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs);
+  ReplaceStmt(Exp, SelExp);
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return SelExp;
+}
+
+CallExpr *
+RewriteObjC::SynthesizeCallToFunctionDecl(FunctionDecl *FD,
+                                          ArrayRef<Expr *> Args,
+                                          SourceLocation StartLoc,
+                                          SourceLocation EndLoc) {
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = FD->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(*Context, FD, false, msgSendType,
+                                               VK_LValue, SourceLocation());
+
+  // Now, we cast the reference to a pointer to the objc_msgSend type.
+  QualType pToFunc = Context->getPointerType(msgSendType);
+  ImplicitCastExpr *ICE =
+      ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
+                               DRE, nullptr, VK_PRValue, FPOptionsOverride());
+
+  const auto *FT = msgSendType->castAs<FunctionType>();
+
+  CallExpr *Exp =
+      CallExpr::Create(*Context, ICE, Args, FT->getCallResultType(*Context),
+                       VK_PRValue, EndLoc, FPOptionsOverride());
+  return Exp;
+}
+
+static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
+                                const char *&startRef, const char *&endRef) {
+  while (startBuf < endBuf) {
+    if (*startBuf == '<')
+      startRef = startBuf; // mark the start.
+    if (*startBuf == '>') {
+      if (startRef && *startRef == '<') {
+        endRef = startBuf; // mark the end.
+        return true;
+      }
+      return false;
+    }
+    startBuf++;
+  }
+  return false;
+}
+
+static void scanToNextArgument(const char *&argRef) {
+  int angle = 0;
+  while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
+    if (*argRef == '<')
+      angle++;
+    else if (*argRef == '>')
+      angle--;
+    argRef++;
+  }
+  assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
+}
+
+bool RewriteObjC::needToScanForQualifiers(QualType T) {
+  if (T->isObjCQualifiedIdType())
+    return true;
+  if (const PointerType *PT = T->getAs<PointerType>()) {
+    if (PT->getPointeeType()->isObjCQualifiedIdType())
+      return true;
+  }
+  if (T->isObjCObjectPointerType()) {
+    T = T->getPointeeType();
+    return T->isObjCQualifiedInterfaceType();
+  }
+  if (T->isArrayType()) {
+    QualType ElemTy = Context->getBaseElementType(T);
+    return needToScanForQualifiers(ElemTy);
+  }
+  return false;
+}
+
+void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
+  QualType Type = E->getType();
+  if (needToScanForQualifiers(Type)) {
+    SourceLocation Loc, EndLoc;
+
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
+      Loc = ECE->getLParenLoc();
+      EndLoc = ECE->getRParenLoc();
+    } else {
+      Loc = E->getBeginLoc();
+      EndLoc = E->getEndLoc();
+    }
+    // This will defend against trying to rewrite synthesized expressions.
+    if (Loc.isInvalid() || EndLoc.isInvalid())
+      return;
+
+    const char *startBuf = SM->getCharacterData(Loc);
+    const char *endBuf = SM->getCharacterData(EndLoc);
+    const char *startRef = nullptr, *endRef = nullptr;
+    if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+      // Get the locations of the startRef, endRef.
+      SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
+      SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
+      // Comment out the protocol references.
+      InsertText(LessLoc, "/*");
+      InsertText(GreaterLoc, "*/");
+    }
+  }
+}
+
+void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
+  SourceLocation Loc;
+  QualType Type;
+  const FunctionProtoType *proto = nullptr;
+  if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
+    Loc = VD->getLocation();
+    Type = VD->getType();
+  }
+  else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
+    Loc = FD->getLocation();
+    // Check for ObjC 'id' and class types that have been adorned with protocol
+    // information (id<p>, C<p>*). The protocol references need to be rewritten!
+    const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
+    assert(funcType && "missing function type");
+    proto = dyn_cast<FunctionProtoType>(funcType);
+    if (!proto)
+      return;
+    Type = proto->getReturnType();
+  }
+  else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
+    Loc = FD->getLocation();
+    Type = FD->getType();
+  }
+  else
+    return;
+
+  if (needToScanForQualifiers(Type)) {
+    // Since types are unique, we need to scan the buffer.
+
+    const char *endBuf = SM->getCharacterData(Loc);
+    const char *startBuf = endBuf;
+    while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
+      startBuf--; // scan backward (from the decl location) for return type.
+    const char *startRef = nullptr, *endRef = nullptr;
+    if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+      // Get the locations of the startRef, endRef.
+      SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
+      SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
+      // Comment out the protocol references.
+      InsertText(LessLoc, "/*");
+      InsertText(GreaterLoc, "*/");
+    }
+  }
+  if (!proto)
+      return; // most likely, was a variable
+  // Now check arguments.
+  const char *startBuf = SM->getCharacterData(Loc);
+  const char *startFuncBuf = startBuf;
+  for (unsigned i = 0; i < proto->getNumParams(); i++) {
+    if (needToScanForQualifiers(proto->getParamType(i))) {
+      // Since types are unique, we need to scan the buffer.
+
+      const char *endBuf = startBuf;
+      // scan forward (from the decl location) for argument types.
+      scanToNextArgument(endBuf);
+      const char *startRef = nullptr, *endRef = nullptr;
+      if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
+        // Get the locations of the startRef, endRef.
+        SourceLocation LessLoc =
+          Loc.getLocWithOffset(startRef-startFuncBuf);
+        SourceLocation GreaterLoc =
+          Loc.getLocWithOffset(endRef-startFuncBuf+1);
+        // Comment out the protocol references.
+        InsertText(LessLoc, "/*");
+        InsertText(GreaterLoc, "*/");
+      }
+      startBuf = ++endBuf;
+    }
+    else {
+      // If the function name is derived from a macro expansion, then the
+      // argument buffer will not follow the name. Need to speak with Chris.
+      while (*startBuf && *startBuf != ')' && *startBuf != ',')
+        startBuf++; // scan forward (from the decl location) for argument types.
+      startBuf++;
+    }
+  }
+}
+
+void RewriteObjC::RewriteTypeOfDecl(VarDecl *ND) {
+  QualType QT = ND->getType();
+  const Type* TypePtr = QT->getAs<Type>();
+  if (!isa<TypeOfExprType>(TypePtr))
+    return;
+  while (isa<TypeOfExprType>(TypePtr)) {
+    const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
+    QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
+    TypePtr = QT->getAs<Type>();
+  }
+  // FIXME. This will not work for multiple declarators; as in:
+  // __typeof__(a) b,c,d;
+  std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
+  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  if (ND->getInit()) {
+    std::string Name(ND->getNameAsString());
+    TypeAsString += " " + Name + " = ";
+    Expr *E = ND->getInit();
+    SourceLocation startLoc;
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
+      startLoc = ECE->getLParenLoc();
+    else
+      startLoc = E->getBeginLoc();
+    startLoc = SM->getExpansionLoc(startLoc);
+    const char *endBuf = SM->getCharacterData(startLoc);
+    ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
+  }
+  else {
+    SourceLocation X = ND->getEndLoc();
+    X = SM->getExpansionLoc(X);
+    const char *endBuf = SM->getCharacterData(X);
+    ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
+  }
+}
+
+// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
+void RewriteObjC::SynthSelGetUidFunctionDecl() {
+  IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getFuncType =
+    getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
+  SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                               SourceLocation(),
+                                               SourceLocation(),
+                                               SelGetUidIdent, getFuncType,
+                                               nullptr, SC_Extern);
+}
+
+void RewriteObjC::RewriteFunctionDecl(FunctionDecl *FD) {
+  // declared in <objc/objc.h>
+  if (FD->getIdentifier() &&
+      FD->getName() == "sel_registerName") {
+    SelGetUidFunctionDecl = FD;
+    return;
+  }
+  RewriteObjCQualifiedInterfaceTypes(FD);
+}
+
+void RewriteObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
+  std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
+  const char *argPtr = TypeString.c_str();
+  if (!strchr(argPtr, '^')) {
+    Str += TypeString;
+    return;
+  }
+  while (*argPtr) {
+    Str += (*argPtr == '^' ? '*' : *argPtr);
+    argPtr++;
+  }
+}
+
+// FIXME. Consolidate this routine with RewriteBlockPointerType.
+void RewriteObjC::RewriteBlockPointerTypeVariable(std::string& Str,
+                                                  ValueDecl *VD) {
+  QualType Type = VD->getType();
+  std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
+  const char *argPtr = TypeString.c_str();
+  int paren = 0;
+  while (*argPtr) {
+    switch (*argPtr) {
+      case '(':
+        Str += *argPtr;
+        paren++;
+        break;
+      case ')':
+        Str += *argPtr;
+        paren--;
+        break;
+      case '^':
+        Str += '*';
+        if (paren == 1)
+          Str += VD->getNameAsString();
+        break;
+      default:
+        Str += *argPtr;
+        break;
+    }
+    argPtr++;
+  }
+}
+
+void RewriteObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
+  SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
+  const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
+  const FunctionProtoType *proto = dyn_cast_or_null<FunctionProtoType>(funcType);
+  if (!proto)
+    return;
+  QualType Type = proto->getReturnType();
+  std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
+  FdStr += " ";
+  FdStr += FD->getName();
+  FdStr +=  "(";
+  unsigned numArgs = proto->getNumParams();
+  for (unsigned i = 0; i < numArgs; i++) {
+    QualType ArgType = proto->getParamType(i);
+    RewriteBlockPointerType(FdStr, ArgType);
+    if (i+1 < numArgs)
+      FdStr += ", ";
+  }
+  FdStr +=  ");\n";
+  InsertText(FunLocStart, FdStr);
+  CurFunctionDeclToDeclareForBlock = nullptr;
+}
+
+// SynthSuperConstructorFunctionDecl - id objc_super(id obj, id super);
+void RewriteObjC::SynthSuperConstructorFunctionDecl() {
+  if (SuperConstructorFunctionDecl)
+    return;
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys);
+  SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                     SourceLocation(),
+                                                     SourceLocation(),
+                                                     msgSendIdent, msgSendType,
+                                                     nullptr, SC_Extern);
+}
+
+// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
+void RewriteObjC::SynthMsgSendFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                             SourceLocation(),
+                                             SourceLocation(),
+                                             msgSendIdent, msgSendType,
+                                             nullptr, SC_Extern);
+}
+
+// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(struct objc_super *, SEL op, ...);
+void RewriteObjC::SynthMsgSendSuperFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
+  SmallVector<QualType, 16> ArgTys;
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("objc_super"));
+  QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
+  assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  msgSendIdent, msgSendType,
+                                                  nullptr, SC_Extern);
+}
+
+// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
+void RewriteObjC::SynthMsgSendStretFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  msgSendIdent, msgSendType,
+                                                  nullptr, SC_Extern);
+}
+
+// SynthMsgSendSuperStretFunctionDecl -
+// id objc_msgSendSuper_stret(struct objc_super *, SEL op, ...);
+void RewriteObjC::SynthMsgSendSuperStretFunctionDecl() {
+  IdentifierInfo *msgSendIdent =
+    &Context->Idents.get("objc_msgSendSuper_stret");
+  SmallVector<QualType, 16> ArgTys;
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("objc_super"));
+  QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
+  assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
+                                               ArgTys, /*variadic=*/true);
+  MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                       SourceLocation(),
+                                                       SourceLocation(),
+                                                       msgSendIdent,
+                                                       msgSendType, nullptr,
+                                                       SC_Extern);
+}
+
+// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
+void RewriteObjC::SynthMsgSendFpretFunctionDecl() {
+  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
+  SmallVector<QualType, 16> ArgTys;
+  QualType argT = Context->getObjCIdType();
+  assert(!argT.isNull() && "Can't find 'id' type");
+  ArgTys.push_back(argT);
+  argT = Context->getObjCSelType();
+  assert(!argT.isNull() && "Can't find 'SEL' type");
+  ArgTys.push_back(argT);
+  QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
+                                               ArgTys, /*variadic=*/true);
+  MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  msgSendIdent, msgSendType,
+                                                  nullptr, SC_Extern);
+}
+
+// SynthGetClassFunctionDecl - id objc_getClass(const char *name);
+void RewriteObjC::SynthGetClassFunctionDecl() {
+  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getClassType = getSimpleFunctionType(Context->getObjCIdType(),
+                                                ArgTys);
+  GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                              SourceLocation(),
+                                              SourceLocation(),
+                                              getClassIdent, getClassType,
+                                              nullptr, SC_Extern);
+}
+
+// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
+void RewriteObjC::SynthGetSuperClassFunctionDecl() {
+  IdentifierInfo *getSuperClassIdent =
+    &Context->Idents.get("class_getSuperclass");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getObjCClassType());
+  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
+                                                ArgTys);
+  GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                   SourceLocation(),
+                                                   SourceLocation(),
+                                                   getSuperClassIdent,
+                                                   getClassType, nullptr,
+                                                   SC_Extern);
+}
+
+// SynthGetMetaClassFunctionDecl - id objc_getMetaClass(const char *name);
+void RewriteObjC::SynthGetMetaClassFunctionDecl() {
+  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
+  SmallVector<QualType, 16> ArgTys;
+  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
+  QualType getClassType = getSimpleFunctionType(Context->getObjCIdType(),
+                                                ArgTys);
+  GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
+                                                  SourceLocation(),
+                                                  SourceLocation(),
+                                                  getClassIdent, getClassType,
+                                                  nullptr, SC_Extern);
+}
+
+Stmt *RewriteObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
+  assert(Exp != nullptr && "Expected non-null ObjCStringLiteral");
+  QualType strType = getConstantStringStructType();
+
+  std::string S = "__NSConstantStringImpl_";
+
+  std::string tmpName = InFileName;
+  unsigned i;
+  for (i=0; i < tmpName.length(); i++) {
+    char c = tmpName.at(i);
+    // replace any non-alphanumeric characters with '_'.
+    if (!isAlphanumeric(c))
+      tmpName[i] = '_';
+  }
+  S += tmpName;
+  S += "_";
+  S += utostr(NumObjCStringLiterals++);
+
+  Preamble += "static __NSConstantStringImpl " + S;
+  Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
+  Preamble += "0x000007c8,"; // utf8_str
+  // The pretty printer for StringLiteral handles escape characters properly.
+  std::string prettyBufS;
+  llvm::raw_string_ostream prettyBuf(prettyBufS);
+  Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
+  Preamble += prettyBuf.str();
+  Preamble += ",";
+  Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
+
+  VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                   SourceLocation(), &Context->Idents.get(S),
+                                   strType, nullptr, SC_Static);
+  DeclRefExpr *DRE = new (Context)
+      DeclRefExpr(*Context, NewVD, false, strType, VK_LValue, SourceLocation());
+  Expr *Unop = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), DRE, UO_AddrOf,
+      Context->getPointerType(DRE->getType()), VK_PRValue, OK_Ordinary,
+      SourceLocation(), false, FPOptionsOverride());
+  // cast to NSConstantString *
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
+                                            CK_CPointerToObjCPointerCast, Unop);
+  ReplaceStmt(Exp, cast);
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return cast;
+}
+
+// struct objc_super { struct objc_object *receiver; struct objc_class *super; };
+QualType RewriteObjC::getSuperStructType() {
+  if (!SuperStructDecl) {
+    SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                         SourceLocation(), SourceLocation(),
+                                         &Context->Idents.get("objc_super"));
+    QualType FieldTypes[2];
+
+    // struct objc_object *receiver;
+    FieldTypes[0] = Context->getObjCIdType();
+    // struct objc_class *super;
+    FieldTypes[1] = Context->getObjCClassType();
+
+    // Create fields
+    for (unsigned i = 0; i < 2; ++i) {
+      SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
+                                                 SourceLocation(),
+                                                 SourceLocation(), nullptr,
+                                                 FieldTypes[i], nullptr,
+                                                 /*BitWidth=*/nullptr,
+                                                 /*Mutable=*/false,
+                                                 ICIS_NoInit));
+    }
+
+    SuperStructDecl->completeDefinition();
+  }
+  return Context->getTagDeclType(SuperStructDecl);
+}
+
+QualType RewriteObjC::getConstantStringStructType() {
+  if (!ConstantStringDecl) {
+    ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                            SourceLocation(), SourceLocation(),
+                         &Context->Idents.get("__NSConstantStringImpl"));
+    QualType FieldTypes[4];
+
+    // struct objc_object *receiver;
+    FieldTypes[0] = Context->getObjCIdType();
+    // int flags;
+    FieldTypes[1] = Context->IntTy;
+    // char *str;
+    FieldTypes[2] = Context->getPointerType(Context->CharTy);
+    // long length;
+    FieldTypes[3] = Context->LongTy;
+
+    // Create fields
+    for (unsigned i = 0; i < 4; ++i) {
+      ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
+                                                    ConstantStringDecl,
+                                                    SourceLocation(),
+                                                    SourceLocation(), nullptr,
+                                                    FieldTypes[i], nullptr,
+                                                    /*BitWidth=*/nullptr,
+                                                    /*Mutable=*/true,
+                                                    ICIS_NoInit));
+    }
+
+    ConstantStringDecl->completeDefinition();
+  }
+  return Context->getTagDeclType(ConstantStringDecl);
+}
+
+CallExpr *RewriteObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
+                                                QualType msgSendType,
+                                                QualType returnType,
+                                                SmallVectorImpl<QualType> &ArgTypes,
+                                                SmallVectorImpl<Expr*> &MsgExprs,
+                                                ObjCMethodDecl *Method) {
+  // Create a reference to the objc_msgSend_stret() declaration.
+  DeclRefExpr *STDRE =
+      new (Context) DeclRefExpr(*Context, MsgSendStretFlavor, false,
+                                msgSendType, VK_LValue, SourceLocation());
+  // Need to cast objc_msgSend_stret to "void *" (see above comment).
+  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context,
+                                  Context->getPointerType(Context->VoidTy),
+                                  CK_BitCast, STDRE);
+  // Now do the "normal" pointer to function cast.
+  QualType castType = getSimpleFunctionType(returnType, ArgTypes,
+                                            Method ? Method->isVariadic()
+                                                   : false);
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                            cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), cast);
+
+  const auto *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *STCE =
+      CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(), VK_PRValue,
+                       SourceLocation(), FPOptionsOverride());
+  return STCE;
+}
+
+Stmt *RewriteObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
+                                    SourceLocation StartLoc,
+                                    SourceLocation EndLoc) {
+  if (!SelGetUidFunctionDecl)
+    SynthSelGetUidFunctionDecl();
+  if (!MsgSendFunctionDecl)
+    SynthMsgSendFunctionDecl();
+  if (!MsgSendSuperFunctionDecl)
+    SynthMsgSendSuperFunctionDecl();
+  if (!MsgSendStretFunctionDecl)
+    SynthMsgSendStretFunctionDecl();
+  if (!MsgSendSuperStretFunctionDecl)
+    SynthMsgSendSuperStretFunctionDecl();
+  if (!MsgSendFpretFunctionDecl)
+    SynthMsgSendFpretFunctionDecl();
+  if (!GetClassFunctionDecl)
+    SynthGetClassFunctionDecl();
+  if (!GetSuperClassFunctionDecl)
+    SynthGetSuperClassFunctionDecl();
+  if (!GetMetaClassFunctionDecl)
+    SynthGetMetaClassFunctionDecl();
+
+  // default to objc_msgSend().
+  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
+  // May need to use objc_msgSend_stret() as well.
+  FunctionDecl *MsgSendStretFlavor = nullptr;
+  if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
+    QualType resultType = mDecl->getReturnType();
+    if (resultType->isRecordType())
+      MsgSendStretFlavor = MsgSendStretFunctionDecl;
+    else if (resultType->isRealFloatingType())
+      MsgSendFlavor = MsgSendFpretFunctionDecl;
+  }
+
+  // Synthesize a call to objc_msgSend().
+  SmallVector<Expr*, 8> MsgExprs;
+  switch (Exp->getReceiverKind()) {
+  case ObjCMessageExpr::SuperClass: {
+    MsgSendFlavor = MsgSendSuperFunctionDecl;
+    if (MsgSendStretFlavor)
+      MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
+    assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
+
+    ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
+
+    SmallVector<Expr*, 4> InitExprs;
+
+    // set the receiver to self, the first argument to all methods.
+    InitExprs.push_back(NoTypeInfoCStyleCastExpr(
+        Context, Context->getObjCIdType(), CK_BitCast,
+        new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
+                                  Context->getObjCIdType(), VK_PRValue,
+                                  SourceLocation()))); // set the 'receiver'.
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    SmallVector<Expr*, 8> ClsExprs;
+    ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
+                                                 ClsExprs, StartLoc, EndLoc);
+    // (Class)objc_getClass("CurrentClass")
+    CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
+                                             Context->getObjCClassType(),
+                                             CK_BitCast, Cls);
+    ClsExprs.clear();
+    ClsExprs.push_back(ArgExpr);
+    Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
+                                       StartLoc, EndLoc);
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    // To turn off a warning, type-cast to 'id'
+    InitExprs.push_back( // set 'super class', using class_getSuperclass().
+                        NoTypeInfoCStyleCastExpr(Context,
+                                                 Context->getObjCIdType(),
+                                                 CK_BitCast, Cls));
+    // struct objc_super
+    QualType superType = getSuperStructType();
+    Expr *SuperRep;
+
+    if (LangOpts.MicrosoftExt) {
+      SynthSuperConstructorFunctionDecl();
+      // Simulate a constructor call...
+      DeclRefExpr *DRE = new (Context)
+          DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
+                      VK_LValue, SourceLocation());
+      SuperRep =
+          CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
+                           SourceLocation(), FPOptionsOverride());
+      // The code for super is a little tricky to prevent collision with
+      // the structure definition in the header. The rewriter has it's own
+      // internal definition (__rw_objc_super) that is uses. This is why
+      // we need the cast below. For example:
+      // (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
+      //
+      SuperRep = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
+          Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
+          SourceLocation(), false, FPOptionsOverride());
+      SuperRep = NoTypeInfoCStyleCastExpr(Context,
+                                          Context->getPointerType(superType),
+                                          CK_BitCast, SuperRep);
+    } else {
+      // (struct objc_super) { <exprs from above> }
+      InitListExpr *ILE =
+        new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
+                                   SourceLocation());
+      TypeSourceInfo *superTInfo
+        = Context->getTrivialTypeSourceInfo(superType);
+      SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
+                                                   superType, VK_LValue,
+                                                   ILE, false);
+      // struct objc_super *
+      SuperRep = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
+          Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
+          SourceLocation(), false, FPOptionsOverride());
+    }
+    MsgExprs.push_back(SuperRep);
+    break;
+  }
+
+  case ObjCMessageExpr::Class: {
+    SmallVector<Expr*, 8> ClsExprs;
+    auto *Class =
+        Exp->getClassReceiver()->castAs<ObjCObjectType>()->getInterface();
+    IdentifierInfo *clsName = Class->getIdentifier();
+    ClsExprs.push_back(getStringLiteral(clsName->getName()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                                 StartLoc, EndLoc);
+    MsgExprs.push_back(Cls);
+    break;
+  }
+
+  case ObjCMessageExpr::SuperInstance:{
+    MsgSendFlavor = MsgSendSuperFunctionDecl;
+    if (MsgSendStretFlavor)
+      MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
+    assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
+    ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
+    SmallVector<Expr*, 4> InitExprs;
+
+    InitExprs.push_back(NoTypeInfoCStyleCastExpr(
+        Context, Context->getObjCIdType(), CK_BitCast,
+        new (Context) DeclRefExpr(*Context, CurMethodDef->getSelfDecl(), false,
+                                  Context->getObjCIdType(), VK_PRValue,
+                                  SourceLocation()))); // set the 'receiver'.
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    SmallVector<Expr*, 8> ClsExprs;
+    ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
+    CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
+                                                 StartLoc, EndLoc);
+    // (Class)objc_getClass("CurrentClass")
+    CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
+                                                 Context->getObjCClassType(),
+                                                 CK_BitCast, Cls);
+    ClsExprs.clear();
+    ClsExprs.push_back(ArgExpr);
+    Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
+                                       StartLoc, EndLoc);
+
+    // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
+    // To turn off a warning, type-cast to 'id'
+    InitExprs.push_back(
+      // set 'super class', using class_getSuperclass().
+      NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                               CK_BitCast, Cls));
+    // struct objc_super
+    QualType superType = getSuperStructType();
+    Expr *SuperRep;
+
+    if (LangOpts.MicrosoftExt) {
+      SynthSuperConstructorFunctionDecl();
+      // Simulate a constructor call...
+      DeclRefExpr *DRE = new (Context)
+          DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
+                      VK_LValue, SourceLocation());
+      SuperRep =
+          CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
+                           SourceLocation(), FPOptionsOverride());
+      // The code for super is a little tricky to prevent collision with
+      // the structure definition in the header. The rewriter has it's own
+      // internal definition (__rw_objc_super) that is uses. This is why
+      // we need the cast below. For example:
+      // (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
+      //
+      SuperRep = UnaryOperator::Create(
+          const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
+          Context->getPointerType(SuperRep->getType()), VK_PRValue, OK_Ordinary,
+          SourceLocation(), false, FPOptionsOverride());
+      SuperRep = NoTypeInfoCStyleCastExpr(Context,
+                               Context->getPointerType(superType),
+                               CK_BitCast, SuperRep);
+    } else {
+      // (struct objc_super) { <exprs from above> }
+      InitListExpr *ILE =
+        new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
+                                   SourceLocation());
+      TypeSourceInfo *superTInfo
+        = Context->getTrivialTypeSourceInfo(superType);
+      SuperRep = new (Context) CompoundLiteralExpr(
+          SourceLocation(), superTInfo, superType, VK_PRValue, ILE, false);
+    }
+    MsgExprs.push_back(SuperRep);
+    break;
+  }
+
+  case ObjCMessageExpr::Instance: {
+    // Remove all type-casts because it may contain objc-style types; e.g.
+    // Foo<Proto> *.
+    Expr *recExpr = Exp->getInstanceReceiver();
+    while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
+      recExpr = CE->getSubExpr();
+    CastKind CK = recExpr->getType()->isObjCObjectPointerType()
+                    ? CK_BitCast : recExpr->getType()->isBlockPointerType()
+                                     ? CK_BlockPointerToObjCPointerCast
+                                     : CK_CPointerToObjCPointerCast;
+
+    recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                       CK, recExpr);
+    MsgExprs.push_back(recExpr);
+    break;
+  }
+  }
+
+  // Create a call to sel_registerName("selName"), it will be the 2nd argument.
+  SmallVector<Expr*, 8> SelExprs;
+  SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
+  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
+                                                  SelExprs, StartLoc, EndLoc);
+  MsgExprs.push_back(SelExp);
+
+  // Now push any user supplied arguments.
+  for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
+    Expr *userExpr = Exp->getArg(i);
+    // Make all implicit casts explicit...ICE comes in handy:-)
+    if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
+      // Reuse the ICE type, it is exactly what the doctor ordered.
+      QualType type = ICE->getType();
+      if (needToScanForQualifiers(type))
+        type = Context->getObjCIdType();
+      // Make sure we convert "type (^)(...)" to "type (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(type);
+      const Expr *SubExpr = ICE->IgnoreParenImpCasts();
+      CastKind CK;
+      if (SubExpr->getType()->isIntegralType(*Context) &&
+          type->isBooleanType()) {
+        CK = CK_IntegralToBoolean;
+      } else if (type->isObjCObjectPointerType()) {
+        if (SubExpr->getType()->isBlockPointerType()) {
+          CK = CK_BlockPointerToObjCPointerCast;
+        } else if (SubExpr->getType()->isPointerType()) {
+          CK = CK_CPointerToObjCPointerCast;
+        } else {
+          CK = CK_BitCast;
+        }
+      } else {
+        CK = CK_BitCast;
+      }
+
+      userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, userExpr);
+    }
+    // Make id<P...> cast into an 'id' cast.
+    else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
+      if (CE->getType()->isObjCQualifiedIdType()) {
+        while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
+          userExpr = CE->getSubExpr();
+        CastKind CK;
+        if (userExpr->getType()->isIntegralType(*Context)) {
+          CK = CK_IntegralToPointer;
+        } else if (userExpr->getType()->isBlockPointerType()) {
+          CK = CK_BlockPointerToObjCPointerCast;
+        } else if (userExpr->getType()->isPointerType()) {
+          CK = CK_CPointerToObjCPointerCast;
+        } else {
+          CK = CK_BitCast;
+        }
+        userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
+                                            CK, userExpr);
+      }
+    }
+    MsgExprs.push_back(userExpr);
+    // We've transferred the ownership to MsgExprs. For now, we *don't* null
+    // out the argument in the original expression (since we aren't deleting
+    // the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
+    //Exp->setArg(i, 0);
+  }
+  // Generate the funky cast.
+  CastExpr *cast;
+  SmallVector<QualType, 8> ArgTypes;
+  QualType returnType;
+
+  // Push 'id' and 'SEL', the 2 implicit arguments.
+  if (MsgSendFlavor == MsgSendSuperFunctionDecl)
+    ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
+  else
+    ArgTypes.push_back(Context->getObjCIdType());
+  ArgTypes.push_back(Context->getObjCSelType());
+  if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
+    // Push any user argument types.
+    for (const auto *PI : OMD->parameters()) {
+      QualType t = PI->getType()->isObjCQualifiedIdType()
+                     ? Context->getObjCIdType()
+                     : PI->getType();
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      (void)convertBlockPointerToFunctionPointer(t);
+      ArgTypes.push_back(t);
+    }
+    returnType = Exp->getType();
+    convertToUnqualifiedObjCType(returnType);
+    (void)convertBlockPointerToFunctionPointer(returnType);
+  } else {
+    returnType = Context->getObjCIdType();
+  }
+  // Get the type, we will need to reference it in a couple spots.
+  QualType msgSendType = MsgSendFlavor->getType();
+
+  // Create a reference to the objc_msgSend() declaration.
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
+
+  // Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
+  // If we don't do this cast, we get the following bizarre warning/note:
+  // xx.m:13: warning: function called through a non-compatible type
+  // xx.m:13: note: if this code is reached, the program will abort
+  cast = NoTypeInfoCStyleCastExpr(Context,
+                                  Context->getPointerType(Context->VoidTy),
+                                  CK_BitCast, DRE);
+
+  // Now do the "normal" pointer to function cast.
+  // If we don't have a method decl, force a variadic cast.
+  const ObjCMethodDecl *MD = Exp->getMethodDecl();
+  QualType castType =
+    getSimpleFunctionType(returnType, ArgTypes, MD ? MD->isVariadic() : true);
+  castType = Context->getPointerType(castType);
+  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
+                                  cast);
+
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
+
+  const auto *FT = msgSendType->castAs<FunctionType>();
+  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
+                                  VK_PRValue, EndLoc, FPOptionsOverride());
+  Stmt *ReplacingStmt = CE;
+  if (MsgSendStretFlavor) {
+    // We have the method which returns a struct/union. Must also generate
+    // call to objc_msgSend_stret and hang both varieties on a conditional
+    // expression which dictate which one to envoke depending on size of
+    // method's return type.
+
+    CallExpr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
+                                               msgSendType, returnType,
+                                               ArgTypes, MsgExprs,
+                                               Exp->getMethodDecl());
+
+    // Build sizeof(returnType)
+    UnaryExprOrTypeTraitExpr *sizeofExpr =
+       new (Context) UnaryExprOrTypeTraitExpr(UETT_SizeOf,
+                                 Context->getTrivialTypeSourceInfo(returnType),
+                                 Context->getSizeType(), SourceLocation(),
+                                 SourceLocation());
+    // (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
+    // FIXME: Value of 8 is base on ppc32/x86 ABI for the most common cases.
+    // For X86 it is more complicated and some kind of target specific routine
+    // is needed to decide what to do.
+    unsigned IntSize =
+      static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+    IntegerLiteral *limit = IntegerLiteral::Create(*Context,
+                                                   llvm::APInt(IntSize, 8),
+                                                   Context->IntTy,
+                                                   SourceLocation());
+    BinaryOperator *lessThanExpr = BinaryOperator::Create(
+        *Context, sizeofExpr, limit, BO_LE, Context->IntTy, VK_PRValue,
+        OK_Ordinary, SourceLocation(), FPOptionsOverride());
+    // (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
+    ConditionalOperator *CondExpr = new (Context) ConditionalOperator(
+        lessThanExpr, SourceLocation(), CE, SourceLocation(), STCE, returnType,
+        VK_PRValue, OK_Ordinary);
+    ReplacingStmt = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                            CondExpr);
+  }
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return ReplacingStmt;
+}
+
+Stmt *RewriteObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
+  Stmt *ReplacingStmt =
+      SynthMessageExpr(Exp, Exp->getBeginLoc(), Exp->getEndLoc());
+
+  // Now do the actual rewrite.
+  ReplaceStmt(Exp, ReplacingStmt);
+
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return ReplacingStmt;
+}
+
+// typedef struct objc_object Protocol;
+QualType RewriteObjC::getProtocolType() {
+  if (!ProtocolTypeDecl) {
+    TypeSourceInfo *TInfo
+      = Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
+    ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
+                                           SourceLocation(), SourceLocation(),
+                                           &Context->Idents.get("Protocol"),
+                                           TInfo);
+  }
+  return Context->getTypeDeclType(ProtocolTypeDecl);
+}
+
+/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
+/// a synthesized/forward data reference (to the protocol's metadata).
+/// The forward references (and metadata) are generated in
+/// RewriteObjC::HandleTranslationUnit().
+Stmt *RewriteObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
+  std::string Name = "_OBJC_PROTOCOL_" + Exp->getProtocol()->getNameAsString();
+  IdentifierInfo *ID = &Context->Idents.get(Name);
+  VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
+                                SourceLocation(), ID, getProtocolType(),
+                                nullptr, SC_Extern);
+  DeclRefExpr *DRE = new (Context) DeclRefExpr(
+      *Context, VD, false, getProtocolType(), VK_LValue, SourceLocation());
+  Expr *DerefExpr = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), DRE, UO_AddrOf,
+      Context->getPointerType(DRE->getType()), VK_PRValue, OK_Ordinary,
+      SourceLocation(), false, FPOptionsOverride());
+  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, DerefExpr->getType(),
+                                                CK_BitCast,
+                                                DerefExpr);
+  ReplaceStmt(Exp, castExpr);
+  ProtocolExprDecls.insert(Exp->getProtocol()->getCanonicalDecl());
+  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
+  return castExpr;
+}
+
+bool RewriteObjC::BufferContainsPPDirectives(const char *startBuf,
+                                             const char *endBuf) {
+  while (startBuf < endBuf) {
+    if (*startBuf == '#') {
+      // Skip whitespace.
+      for (++startBuf; startBuf[0] == ' ' || startBuf[0] == '\t'; ++startBuf)
+        ;
+      if (!strncmp(startBuf, "if", strlen("if")) ||
+          !strncmp(startBuf, "ifdef", strlen("ifdef")) ||
+          !strncmp(startBuf, "ifndef", strlen("ifndef")) ||
+          !strncmp(startBuf, "define", strlen("define")) ||
+          !strncmp(startBuf, "undef", strlen("undef")) ||
+          !strncmp(startBuf, "else", strlen("else")) ||
+          !strncmp(startBuf, "elif", strlen("elif")) ||
+          !strncmp(startBuf, "endif", strlen("endif")) ||
+          !strncmp(startBuf, "pragma", strlen("pragma")) ||
+          !strncmp(startBuf, "include", strlen("include")) ||
+          !strncmp(startBuf, "import", strlen("import")) ||
+          !strncmp(startBuf, "include_next", strlen("include_next")))
+        return true;
+    }
+    startBuf++;
+  }
+  return false;
+}
+
+/// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
+/// an objective-c class with ivars.
+void RewriteObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
+                                               std::string &Result) {
+  assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
+  assert(CDecl->getName() != "" &&
+         "Name missing in SynthesizeObjCInternalStruct");
+  // Do not synthesize more than once.
+  if (ObjCSynthesizedStructs.count(CDecl))
+    return;
+  ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
+  int NumIvars = CDecl->ivar_size();
+  SourceLocation LocStart = CDecl->getBeginLoc();
+  SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
+
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+
+  // If no ivars and no root or if its root, directly or indirectly,
+  // have no ivars (thus not synthesized) then no need to synthesize this class.
+  if ((!CDecl->isThisDeclarationADefinition() || NumIvars == 0) &&
+      (!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
+    endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
+    ReplaceText(LocStart, endBuf-startBuf, Result);
+    return;
+  }
+
+  // FIXME: This has potential of causing problem. If
+  // SynthesizeObjCInternalStruct is ever called recursively.
+  Result += "\nstruct ";
+  Result += CDecl->getNameAsString();
+  if (LangOpts.MicrosoftExt)
+    Result += "_IMPL";
+
+  if (NumIvars > 0) {
+    const char *cursor = strchr(startBuf, '{');
+    assert((cursor && endBuf)
+           && "SynthesizeObjCInternalStruct - malformed @interface");
+    // If the buffer contains preprocessor directives, we do more fine-grained
+    // rewrites. This is intended to fix code that looks like (which occurs in
+    // NSURL.h, for example):
+    //
+    // #ifdef XYZ
+    // @interface Foo : NSObject
+    // #else
+    // @interface FooBar : NSObject
+    // #endif
+    // {
+    //    int i;
+    // }
+    // @end
+    //
+    // This clause is segregated to avoid breaking the common case.
+    if (BufferContainsPPDirectives(startBuf, cursor)) {
+      SourceLocation L = RCDecl ? CDecl->getSuperClassLoc() :
+                                  CDecl->getAtStartLoc();
+      const char *endHeader = SM->getCharacterData(L);
+      endHeader += Lexer::MeasureTokenLength(L, *SM, LangOpts);
+
+      if (CDecl->protocol_begin() != CDecl->protocol_end()) {
+        // advance to the end of the referenced protocols.
+        while (endHeader < cursor && *endHeader != '>') endHeader++;
+        endHeader++;
+      }
+      // rewrite the original header
+      ReplaceText(LocStart, endHeader-startBuf, Result);
+    } else {
+      // rewrite the original header *without* disturbing the '{'
+      ReplaceText(LocStart, cursor-startBuf, Result);
+    }
+    if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
+      Result = "\n    struct ";
+      Result += RCDecl->getNameAsString();
+      Result += "_IMPL ";
+      Result += RCDecl->getNameAsString();
+      Result += "_IVARS;\n";
+
+      // insert the super class structure definition.
+      SourceLocation OnePastCurly =
+        LocStart.getLocWithOffset(cursor-startBuf+1);
+      InsertText(OnePastCurly, Result);
+    }
+    cursor++; // past '{'
+
+    // Now comment out any visibility specifiers.
+    while (cursor < endBuf) {
+      if (*cursor == '@') {
+        SourceLocation atLoc = LocStart.getLocWithOffset(cursor-startBuf);
+        // Skip whitespace.
+        for (++cursor; cursor[0] == ' ' || cursor[0] == '\t'; ++cursor)
+          /*scan*/;
+
+        // FIXME: presence of @public, etc. inside comment results in
+        // this transformation as well, which is still correct c-code.
+        if (!strncmp(cursor, "public", strlen("public")) ||
+            !strncmp(cursor, "private", strlen("private")) ||
+            !strncmp(cursor, "package", strlen("package")) ||
+            !strncmp(cursor, "protected", strlen("protected")))
+          InsertText(atLoc, "// ");
+      }
+      // FIXME: If there are cases where '<' is used in ivar declaration part
+      // of user code, then scan the ivar list and use needToScanForQualifiers
+      // for type checking.
+      else if (*cursor == '<') {
+        SourceLocation atLoc = LocStart.getLocWithOffset(cursor-startBuf);
+        InsertText(atLoc, "/* ");
+        cursor = strchr(cursor, '>');
+        cursor++;
+        atLoc = LocStart.getLocWithOffset(cursor-startBuf);
+        InsertText(atLoc, " */");
+      } else if (*cursor == '^') { // rewrite block specifier.
+        SourceLocation caretLoc = LocStart.getLocWithOffset(cursor-startBuf);
+        ReplaceText(caretLoc, 1, "*");
+      }
+      cursor++;
+    }
+    // Don't forget to add a ';'!!
+    InsertText(LocEnd.getLocWithOffset(1), ";");
+  } else { // we don't have any instance variables - insert super struct.
+    endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
+    Result += " {\n    struct ";
+    Result += RCDecl->getNameAsString();
+    Result += "_IMPL ";
+    Result += RCDecl->getNameAsString();
+    Result += "_IVARS;\n};\n";
+    ReplaceText(LocStart, endBuf-startBuf, Result);
+  }
+  // Mark this struct as having been generated.
+  if (!ObjCSynthesizedStructs.insert(CDecl).second)
+    llvm_unreachable("struct already synthesize- SynthesizeObjCInternalStruct");
+}
+
+//===----------------------------------------------------------------------===//
+// Meta Data Emission
+//===----------------------------------------------------------------------===//
+
+/// RewriteImplementations - This routine rewrites all method implementations
+/// and emits meta-data.
+
+void RewriteObjC::RewriteImplementations() {
+  int ClsDefCount = ClassImplementation.size();
+  int CatDefCount = CategoryImplementation.size();
+
+  // Rewrite implemented methods
+  for (int i = 0; i < ClsDefCount; i++)
+    RewriteImplementationDecl(ClassImplementation[i]);
+
+  for (int i = 0; i < CatDefCount; i++)
+    RewriteImplementationDecl(CategoryImplementation[i]);
+}
+
+void RewriteObjC::RewriteByRefString(std::string &ResultStr,
+                                     const std::string &Name,
+                                     ValueDecl *VD, bool def) {
+  assert(BlockByRefDeclNo.count(VD) &&
+         "RewriteByRefString: ByRef decl missing");
+  if (def)
+    ResultStr += "struct ";
+  ResultStr += "__Block_byref_" + Name +
+    "_" + utostr(BlockByRefDeclNo[VD]) ;
+}
+
+static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
+  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
+    return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
+  return false;
+}
+
+std::string RewriteObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
+                                                   StringRef funcName,
+                                                   std::string Tag) {
+  const FunctionType *AFT = CE->getFunctionType();
+  QualType RT = AFT->getReturnType();
+  std::string StructRef = "struct " + Tag;
+  std::string S = "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
+                  funcName.str() + "_" + "block_func_" + utostr(i);
+
+  BlockDecl *BD = CE->getBlockDecl();
+
+  if (isa<FunctionNoProtoType>(AFT)) {
+    // No user-supplied arguments. Still need to pass in a pointer to the
+    // block (to reference imported block decl refs).
+    S += "(" + StructRef + " *__cself)";
+  } else if (BD->param_empty()) {
+    S += "(" + StructRef + " *__cself)";
+  } else {
+    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
+    assert(FT && "SynthesizeBlockFunc: No function proto");
+    S += '(';
+    // first add the implicit argument.
+    S += StructRef + " *__cself, ";
+    std::string ParamStr;
+    for (BlockDecl::param_iterator AI = BD->param_begin(),
+         E = BD->param_end(); AI != E; ++AI) {
+      if (AI != BD->param_begin()) S += ", ";
+      ParamStr = (*AI)->getNameAsString();
+      QualType QT = (*AI)->getType();
+      (void)convertBlockPointerToFunctionPointer(QT);
+      QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
+      S += ParamStr;
+    }
+    if (FT->isVariadic()) {
+      if (!BD->param_empty()) S += ", ";
+      S += "...";
+    }
+    S += ')';
+  }
+  S += " {\n";
+
+  // Create local declarations to avoid rewriting all closure decl ref exprs.
+  // First, emit a declaration for all "by ref" decls.
+  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+       E = BlockByRefDecls.end(); I != E; ++I) {
+    S += "  ";
+    std::string Name = (*I)->getNameAsString();
+    std::string TypeString;
+    RewriteByRefString(TypeString, Name, (*I));
+    TypeString += " *";
+    Name = TypeString + Name;
+    S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
+  }
+  // Next, emit a declaration for all "by copy" declarations.
+  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+       E = BlockByCopyDecls.end(); I != E; ++I) {
+    S += "  ";
+    // Handle nested closure invocation. For example:
+    //
+    //   void (^myImportedClosure)(void);
+    //   myImportedClosure  = ^(void) { setGlobalInt(x + y); };
+    //
+    //   void (^anotherClosure)(void);
+    //   anotherClosure = ^(void) {
+    //     myImportedClosure(); // import and invoke the closure
+    //   };
+    //
+    if (isTopLevelBlockPointerType((*I)->getType())) {
+      RewriteBlockPointerTypeVariable(S, (*I));
+      S += " = (";
+      RewriteBlockPointerType(S, (*I)->getType());
+      S += ")";
+      S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
+    }
+    else {
+      std::string Name = (*I)->getNameAsString();
+      QualType QT = (*I)->getType();
+      if (HasLocalVariableExternalStorage(*I))
+        QT = Context->getPointerType(QT);
+      QT.getAsStringInternal(Name, Context->getPrintingPolicy());
+      S += Name + " = __cself->" +
+                              (*I)->getNameAsString() + "; // bound by copy\n";
+    }
+  }
+  std::string RewrittenStr = RewrittenBlockExprs[CE];
+  const char *cstr = RewrittenStr.c_str();
+  while (*cstr++ != '{') ;
+  S += cstr;
+  S += "\n";
+  return S;
+}
+
+std::string RewriteObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
+                                                   StringRef funcName,
+                                                   std::string Tag) {
+  std::string StructRef = "struct " + Tag;
+  std::string S = "static void __";
+
+  S += funcName;
+  S += "_block_copy_" + utostr(i);
+  S += "(" + StructRef;
+  S += "*dst, " + StructRef;
+  S += "*src) {";
+  for (ValueDecl *VD : ImportedBlockDecls) {
+    S += "_Block_object_assign((void*)&dst->";
+    S += VD->getNameAsString();
+    S += ", (void*)src->";
+    S += VD->getNameAsString();
+    if (BlockByRefDeclsPtrSet.count(VD))
+      S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
+    else if (VD->getType()->isBlockPointerType())
+      S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
+    else
+      S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
+  }
+  S += "}\n";
+
+  S += "\nstatic void __";
+  S += funcName;
+  S += "_block_dispose_" + utostr(i);
+  S += "(" + StructRef;
+  S += "*src) {";
+  for (ValueDecl *VD : ImportedBlockDecls) {
+    S += "_Block_object_dispose((void*)src->";
+    S += VD->getNameAsString();
+    if (BlockByRefDeclsPtrSet.count(VD))
+      S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
+    else if (VD->getType()->isBlockPointerType())
+      S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
+    else
+      S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
+  }
+  S += "}\n";
+  return S;
+}
+
+std::string RewriteObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
+                                             std::string Desc) {
+  std::string S = "\nstruct " + Tag;
+  std::string Constructor = "  " + Tag;
+
+  S += " {\n  struct __block_impl impl;\n";
+  S += "  struct " + Desc;
+  S += "* Desc;\n";
+
+  Constructor += "(void *fp, "; // Invoke function pointer.
+  Constructor += "struct " + Desc; // Descriptor pointer.
+  Constructor += " *desc";
+
+  if (BlockDeclRefs.size()) {
+    // Output all "by copy" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      S += "  ";
+      std::string FieldName = (*I)->getNameAsString();
+      std::string ArgName = "_" + FieldName;
+      // Handle nested closure invocation. For example:
+      //
+      //   void (^myImportedBlock)(void);
+      //   myImportedBlock  = ^(void) { setGlobalInt(x + y); };
+      //
+      //   void (^anotherBlock)(void);
+      //   anotherBlock = ^(void) {
+      //     myImportedBlock(); // import and invoke the closure
+      //   };
+      //
+      if (isTopLevelBlockPointerType((*I)->getType())) {
+        S += "struct __block_impl *";
+        Constructor += ", void *" + ArgName;
+      } else {
+        QualType QT = (*I)->getType();
+        if (HasLocalVariableExternalStorage(*I))
+          QT = Context->getPointerType(QT);
+        QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
+        QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
+        Constructor += ", " + ArgName;
+      }
+      S += FieldName + ";\n";
+    }
+    // Output all "by ref" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      S += "  ";
+      std::string FieldName = (*I)->getNameAsString();
+      std::string ArgName = "_" + FieldName;
+      {
+        std::string TypeString;
+        RewriteByRefString(TypeString, FieldName, (*I));
+        TypeString += " *";
+        FieldName = TypeString + FieldName;
+        ArgName = TypeString + ArgName;
+        Constructor += ", " + ArgName;
+      }
+      S += FieldName + "; // by ref\n";
+    }
+    // Finish writing the constructor.
+    Constructor += ", int flags=0)";
+    // Initialize all "by copy" arguments.
+    bool firsTime = true;
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      std::string Name = (*I)->getNameAsString();
+        if (firsTime) {
+          Constructor += " : ";
+          firsTime = false;
+        }
+        else
+          Constructor += ", ";
+        if (isTopLevelBlockPointerType((*I)->getType()))
+          Constructor += Name + "((struct __block_impl *)_" + Name + ")";
+        else
+          Constructor += Name + "(_" + Name + ")";
+    }
+    // Initialize all "by ref" arguments.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      std::string Name = (*I)->getNameAsString();
+      if (firsTime) {
+        Constructor += " : ";
+        firsTime = false;
+      }
+      else
+        Constructor += ", ";
+      Constructor += Name + "(_" + Name + "->__forwarding)";
+    }
+
+    Constructor += " {\n";
+    if (GlobalVarDecl)
+      Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
+    else
+      Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
+    Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
+
+    Constructor += "    Desc = desc;\n";
+  } else {
+    // Finish writing the constructor.
+    Constructor += ", int flags=0) {\n";
+    if (GlobalVarDecl)
+      Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
+    else
+      Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
+    Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
+    Constructor += "    Desc = desc;\n";
+  }
+  Constructor += "  ";
+  Constructor += "}\n";
+  S += Constructor;
+  S += "};\n";
+  return S;
+}
+
+std::string RewriteObjC::SynthesizeBlockDescriptor(std::string DescTag,
+                                                   std::string ImplTag, int i,
+                                                   StringRef FunName,
+                                                   unsigned hasCopy) {
+  std::string S = "\nstatic struct " + DescTag;
+
+  S += " {\n  unsigned long reserved;\n";
+  S += "  unsigned long Block_size;\n";
+  if (hasCopy) {
+    S += "  void (*copy)(struct ";
+    S += ImplTag; S += "*, struct ";
+    S += ImplTag; S += "*);\n";
+
+    S += "  void (*dispose)(struct ";
+    S += ImplTag; S += "*);\n";
+  }
+  S += "} ";
+
+  S += DescTag + "_DATA = { 0, sizeof(struct ";
+  S += ImplTag + ")";
+  if (hasCopy) {
+    S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
+    S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
+  }
+  S += "};\n";
+  return S;
+}
+
+void RewriteObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
+                                          StringRef FunName) {
+  // Insert declaration for the function in which block literal is used.
+  if (CurFunctionDeclToDeclareForBlock && !Blocks.empty())
+    RewriteBlockLiteralFunctionDecl(CurFunctionDeclToDeclareForBlock);
+  bool RewriteSC = (GlobalVarDecl &&
+                    !Blocks.empty() &&
+                    GlobalVarDecl->getStorageClass() == SC_Static &&
+                    GlobalVarDecl->getType().getCVRQualifiers());
+  if (RewriteSC) {
+    std::string SC(" void __");
+    SC += GlobalVarDecl->getNameAsString();
+    SC += "() {}";
+    InsertText(FunLocStart, SC);
+  }
+
+  // Insert closures that were part of the function.
+  for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
+    CollectBlockDeclRefInfo(Blocks[i]);
+    // Need to copy-in the inner copied-in variables not actually used in this
+    // block.
+    for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
+      DeclRefExpr *Exp = InnerDeclRefs[count++];
+      ValueDecl *VD = Exp->getDecl();
+      BlockDeclRefs.push_back(Exp);
+      if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
+        BlockByCopyDeclsPtrSet.insert(VD);
+        BlockByCopyDecls.push_back(VD);
+      }
+      if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
+        BlockByRefDeclsPtrSet.insert(VD);
+        BlockByRefDecls.push_back(VD);
+      }
+      // imported objects in the inner blocks not used in the outer
+      // blocks must be copied/disposed in the outer block as well.
+      if (VD->hasAttr<BlocksAttr>() ||
+          VD->getType()->isObjCObjectPointerType() ||
+          VD->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(VD);
+    }
+
+    std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
+    std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
+
+    std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
+
+    InsertText(FunLocStart, CI);
+
+    std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
+
+    InsertText(FunLocStart, CF);
+
+    if (ImportedBlockDecls.size()) {
+      std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
+      InsertText(FunLocStart, HF);
+    }
+    std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
+                                               ImportedBlockDecls.size() > 0);
+    InsertText(FunLocStart, BD);
+
+    BlockDeclRefs.clear();
+    BlockByRefDecls.clear();
+    BlockByRefDeclsPtrSet.clear();
+    BlockByCopyDecls.clear();
+    BlockByCopyDeclsPtrSet.clear();
+    ImportedBlockDecls.clear();
+  }
+  if (RewriteSC) {
+    // Must insert any 'const/volatile/static here. Since it has been
+    // removed as result of rewriting of block literals.
+    std::string SC;
+    if (GlobalVarDecl->getStorageClass() == SC_Static)
+      SC = "static ";
+    if (GlobalVarDecl->getType().isConstQualified())
+      SC += "const ";
+    if (GlobalVarDecl->getType().isVolatileQualified())
+      SC += "volatile ";
+    if (GlobalVarDecl->getType().isRestrictQualified())
+      SC += "restrict ";
+    InsertText(FunLocStart, SC);
+  }
+
+  Blocks.clear();
+  InnerDeclRefsCount.clear();
+  InnerDeclRefs.clear();
+  RewrittenBlockExprs.clear();
+}
+
+void RewriteObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
+  SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
+  StringRef FuncName = FD->getName();
+
+  SynthesizeBlockLiterals(FunLocStart, FuncName);
+}
+
+static void BuildUniqueMethodName(std::string &Name,
+                                  ObjCMethodDecl *MD) {
+  ObjCInterfaceDecl *IFace = MD->getClassInterface();
+  Name = std::string(IFace->getName());
+  Name += "__" + MD->getSelector().getAsString();
+  // Convert colons to underscores.
+  std::string::size_type loc = 0;
+  while ((loc = Name.find(':', loc)) != std::string::npos)
+    Name.replace(loc, 1, "_");
+}
+
+void RewriteObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
+  // fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
+  // SourceLocation FunLocStart = MD->getBeginLoc();
+  SourceLocation FunLocStart = MD->getBeginLoc();
+  std::string FuncName;
+  BuildUniqueMethodName(FuncName, MD);
+  SynthesizeBlockLiterals(FunLocStart, FuncName);
+}
+
+void RewriteObjC::GetBlockDeclRefExprs(Stmt *S) {
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt) {
+      if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt))
+        GetBlockDeclRefExprs(CBE->getBody());
+      else
+        GetBlockDeclRefExprs(SubStmt);
+    }
+  // Handle specific things.
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
+    if (DRE->refersToEnclosingVariableOrCapture() ||
+        HasLocalVariableExternalStorage(DRE->getDecl()))
+      // FIXME: Handle enums.
+      BlockDeclRefs.push_back(DRE);
+}
+
+void RewriteObjC::GetInnerBlockDeclRefExprs(Stmt *S,
+                SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
+                llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
+  for (Stmt *SubStmt : S->children())
+    if (SubStmt) {
+      if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt)) {
+        InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
+        GetInnerBlockDeclRefExprs(CBE->getBody(),
+                                  InnerBlockDeclRefs,
+                                  InnerContexts);
+      }
+      else
+        GetInnerBlockDeclRefExprs(SubStmt, InnerBlockDeclRefs, InnerContexts);
+    }
+  // Handle specific things.
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
+    if (DRE->refersToEnclosingVariableOrCapture() ||
+        HasLocalVariableExternalStorage(DRE->getDecl())) {
+      if (!InnerContexts.count(DRE->getDecl()->getDeclContext()))
+        InnerBlockDeclRefs.push_back(DRE);
+      if (VarDecl *Var = cast<VarDecl>(DRE->getDecl()))
+        if (Var->isFunctionOrMethodVarDecl())
+          ImportedLocalExternalDecls.insert(Var);
+    }
+  }
+}
+
+/// convertFunctionTypeOfBlocks - This routine converts a function type
+/// whose result type may be a block pointer or whose argument type(s)
+/// might be block pointers to an equivalent function type replacing
+/// all block pointers to function pointers.
+QualType RewriteObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
+  // FTP will be null for closures that don't take arguments.
+  // Generate a funky cast.
+  SmallVector<QualType, 8> ArgTypes;
+  QualType Res = FT->getReturnType();
+  bool HasBlockType = convertBlockPointerToFunctionPointer(Res);
+
+  if (FTP) {
+    for (auto &I : FTP->param_types()) {
+      QualType t = I;
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (convertBlockPointerToFunctionPointer(t))
+        HasBlockType = true;
+      ArgTypes.push_back(t);
+    }
+  }
+  QualType FuncType;
+  // FIXME. Does this work if block takes no argument but has a return type
+  // which is of block type?
+  if (HasBlockType)
+    FuncType = getSimpleFunctionType(Res, ArgTypes);
+  else FuncType = QualType(FT, 0);
+  return FuncType;
+}
+
+Stmt *RewriteObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
+  // Navigate to relevant type information.
+  const BlockPointerType *CPT = nullptr;
+
+  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
+    CPT = DRE->getType()->getAs<BlockPointerType>();
+  } else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
+    CPT = MExpr->getType()->getAs<BlockPointerType>();
+  }
+  else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
+    return SynthesizeBlockCall(Exp, PRE->getSubExpr());
+  }
+  else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
+    CPT = IEXPR->getType()->getAs<BlockPointerType>();
+  else if (const ConditionalOperator *CEXPR =
+            dyn_cast<ConditionalOperator>(BlockExp)) {
+    Expr *LHSExp = CEXPR->getLHS();
+    Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
+    Expr *RHSExp = CEXPR->getRHS();
+    Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
+    Expr *CONDExp = CEXPR->getCond();
+    ConditionalOperator *CondExpr = new (Context) ConditionalOperator(
+        CONDExp, SourceLocation(), cast<Expr>(LHSStmt), SourceLocation(),
+        cast<Expr>(RHSStmt), Exp->getType(), VK_PRValue, OK_Ordinary);
+    return CondExpr;
+  } else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
+    CPT = IRE->getType()->getAs<BlockPointerType>();
+  } else if (const PseudoObjectExpr *POE
+               = dyn_cast<PseudoObjectExpr>(BlockExp)) {
+    CPT = POE->getType()->castAs<BlockPointerType>();
+  } else {
+    assert(false && "RewriteBlockClass: Bad type");
+  }
+  assert(CPT && "RewriteBlockClass: Bad type");
+  const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
+  assert(FT && "RewriteBlockClass: Bad type");
+  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
+  // FTP will be null for closures that don't take arguments.
+
+  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                      SourceLocation(), SourceLocation(),
+                                      &Context->Idents.get("__block_impl"));
+  QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
+
+  // Generate a funky cast.
+  SmallVector<QualType, 8> ArgTypes;
+
+  // Push the block argument type.
+  ArgTypes.push_back(PtrBlock);
+  if (FTP) {
+    for (auto &I : FTP->param_types()) {
+      QualType t = I;
+      // Make sure we convert "t (^)(...)" to "t (*)(...)".
+      if (!convertBlockPointerToFunctionPointer(t))
+        convertToUnqualifiedObjCType(t);
+      ArgTypes.push_back(t);
+    }
+  }
+  // Now do the pointer to function cast.
+  QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
+
+  PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
+
+  CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
+                                               CK_BitCast,
+                                               const_cast<Expr*>(BlockExp));
+  // Don't forget the parens to enforce the proper binding.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                          BlkCast);
+  //PE->dump();
+
+  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("FuncPtr"),
+                                    Context->VoidPtrTy, nullptr,
+                                    /*BitWidth=*/nullptr, /*Mutable=*/true,
+                                    ICIS_NoInit);
+  MemberExpr *ME = MemberExpr::CreateImplicit(
+      *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
+
+  CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
+                                                CK_BitCast, ME);
+  PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
+
+  SmallVector<Expr*, 8> BlkExprs;
+  // Add the implicit argument.
+  BlkExprs.push_back(BlkCast);
+  // Add the user arguments.
+  for (CallExpr::arg_iterator I = Exp->arg_begin(),
+       E = Exp->arg_end(); I != E; ++I) {
+    BlkExprs.push_back(*I);
+  }
+  CallExpr *CE =
+      CallExpr::Create(*Context, PE, BlkExprs, Exp->getType(), VK_PRValue,
+                       SourceLocation(), FPOptionsOverride());
+  return CE;
+}
+
+// We need to return the rewritten expression to handle cases where the
+// BlockDeclRefExpr is embedded in another expression being rewritten.
+// For example:
+//
+// int main() {
+//    __block Foo *f;
+//    __block int i;
+//
+//    void (^myblock)() = ^() {
+//        [f test]; // f is a BlockDeclRefExpr embedded in a message (which is being rewritten).
+//        i = 77;
+//    };
+//}
+Stmt *RewriteObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
+  // Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
+  // for each DeclRefExp where BYREFVAR is name of the variable.
+  ValueDecl *VD = DeclRefExp->getDecl();
+  bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() ||
+                 HasLocalVariableExternalStorage(DeclRefExp->getDecl());
+
+  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
+                                    SourceLocation(),
+                                    &Context->Idents.get("__forwarding"),
+                                    Context->VoidPtrTy, nullptr,
+                                    /*BitWidth=*/nullptr, /*Mutable=*/true,
+                                    ICIS_NoInit);
+  MemberExpr *ME =
+      MemberExpr::CreateImplicit(*Context, DeclRefExp, isArrow, FD,
+                                 FD->getType(), VK_LValue, OK_Ordinary);
+
+  StringRef Name = VD->getName();
+  FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
+                         &Context->Idents.get(Name),
+                         Context->VoidPtrTy, nullptr,
+                         /*BitWidth=*/nullptr, /*Mutable=*/true,
+                         ICIS_NoInit);
+  ME = MemberExpr::CreateImplicit(*Context, ME, true, FD, DeclRefExp->getType(),
+                                  VK_LValue, OK_Ordinary);
+
+  // Need parens to enforce precedence.
+  ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
+                                          DeclRefExp->getExprLoc(),
+                                          ME);
+  ReplaceStmt(DeclRefExp, PE);
+  return PE;
+}
+
+// Rewrites the imported local variable V with external storage
+// (static, extern, etc.) as *V
+//
+Stmt *RewriteObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
+  ValueDecl *VD = DRE->getDecl();
+  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
+    if (!ImportedLocalExternalDecls.count(Var))
+      return DRE;
+  Expr *Exp = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), DRE, UO_Deref, DRE->getType(),
+      VK_LValue, OK_Ordinary, DRE->getLocation(), false, FPOptionsOverride());
+  // Need parens to enforce precedence.
+  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
+                                          Exp);
+  ReplaceStmt(DRE, PE);
+  return PE;
+}
+
+void RewriteObjC::RewriteCastExpr(CStyleCastExpr *CE) {
+  SourceLocation LocStart = CE->getLParenLoc();
+  SourceLocation LocEnd = CE->getRParenLoc();
+
+  // Need to avoid trying to rewrite synthesized casts.
+  if (LocStart.isInvalid())
+    return;
+  // Need to avoid trying to rewrite casts contained in macros.
+  if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
+    return;
+
+  const char *startBuf = SM->getCharacterData(LocStart);
+  const char *endBuf = SM->getCharacterData(LocEnd);
+  QualType QT = CE->getType();
+  const Type* TypePtr = QT->getAs<Type>();
+  if (isa<TypeOfExprType>(TypePtr)) {
+    const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
+    QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
+    std::string TypeAsString = "(";
+    RewriteBlockPointerType(TypeAsString, QT);
+    TypeAsString += ")";
+    ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
+    return;
+  }
+  // advance the location to startArgList.
+  const char *argPtr = startBuf;
+
+  while (*argPtr++ && (argPtr < endBuf)) {
+    switch (*argPtr) {
+    case '^':
+      // Replace the '^' with '*'.
+      LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
+      ReplaceText(LocStart, 1, "*");
+      break;
+    }
+  }
+}
+
+void RewriteObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
+  SourceLocation DeclLoc = FD->getLocation();
+  unsigned parenCount = 0;
+
+  // We have 1 or more arguments that have closure pointers.
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  const char *startArgList = strchr(startBuf, '(');
+
+  assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
+
+  parenCount++;
+  // advance the location to startArgList.
+  DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
+  assert((DeclLoc.isValid()) && "Invalid DeclLoc");
+
+  const char *argPtr = startArgList;
+
+  while (*argPtr++ && parenCount) {
+    switch (*argPtr) {
+    case '^':
+      // Replace the '^' with '*'.
+      DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
+      ReplaceText(DeclLoc, 1, "*");
+      break;
+    case '(':
+      parenCount++;
+      break;
+    case ')':
+      parenCount--;
+      break;
+    }
+  }
+}
+
+bool RewriteObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
+  const FunctionProtoType *FTP;
+  const PointerType *PT = QT->getAs<PointerType>();
+  if (PT) {
+    FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
+  } else {
+    const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
+    assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
+    FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
+  }
+  if (FTP) {
+    for (const auto &I : FTP->param_types())
+      if (isTopLevelBlockPointerType(I))
+        return true;
+  }
+  return false;
+}
+
+bool RewriteObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
+  const FunctionProtoType *FTP;
+  const PointerType *PT = QT->getAs<PointerType>();
+  if (PT) {
+    FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
+  } else {
+    const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
+    assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
+    FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
+  }
+  if (FTP) {
+    for (const auto &I : FTP->param_types()) {
+      if (I->isObjCQualifiedIdType())
+        return true;
+      if (I->isObjCObjectPointerType() &&
+          I->getPointeeType()->isObjCQualifiedInterfaceType())
+        return true;
+    }
+
+  }
+  return false;
+}
+
+void RewriteObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
+                                     const char *&RParen) {
+  const char *argPtr = strchr(Name, '(');
+  assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
+
+  LParen = argPtr; // output the start.
+  argPtr++; // skip past the left paren.
+  unsigned parenCount = 1;
+
+  while (*argPtr && parenCount) {
+    switch (*argPtr) {
+    case '(': parenCount++; break;
+    case ')': parenCount--; break;
+    default: break;
+    }
+    if (parenCount) argPtr++;
+  }
+  assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
+  RParen = argPtr; // output the end
+}
+
+void RewriteObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
+  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
+    RewriteBlockPointerFunctionArgs(FD);
+    return;
+  }
+  // Handle Variables and Typedefs.
+  SourceLocation DeclLoc = ND->getLocation();
+  QualType DeclT;
+  if (VarDecl *VD = dyn_cast<VarDecl>(ND))
+    DeclT = VD->getType();
+  else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
+    DeclT = TDD->getUnderlyingType();
+  else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
+    DeclT = FD->getType();
+  else
+    llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
+
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  const char *endBuf = startBuf;
+  // scan backward (from the decl location) for the end of the previous decl.
+  while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
+    startBuf--;
+  SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
+  std::string buf;
+  unsigned OrigLength=0;
+  // *startBuf != '^' if we are dealing with a pointer to function that
+  // may take block argument types (which will be handled below).
+  if (*startBuf == '^') {
+    // Replace the '^' with '*', computing a negative offset.
+    buf = '*';
+    startBuf++;
+    OrigLength++;
+  }
+  while (*startBuf != ')') {
+    buf += *startBuf;
+    startBuf++;
+    OrigLength++;
+  }
+  buf += ')';
+  OrigLength++;
+
+  if (PointerTypeTakesAnyBlockArguments(DeclT) ||
+      PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
+    // Replace the '^' with '*' for arguments.
+    // Replace id<P> with id/*<>*/
+    DeclLoc = ND->getLocation();
+    startBuf = SM->getCharacterData(DeclLoc);
+    const char *argListBegin, *argListEnd;
+    GetExtentOfArgList(startBuf, argListBegin, argListEnd);
+    while (argListBegin < argListEnd) {
+      if (*argListBegin == '^')
+        buf += '*';
+      else if (*argListBegin ==  '<') {
+        buf += "/*";
+        buf += *argListBegin++;
+        OrigLength++;
+        while (*argListBegin != '>') {
+          buf += *argListBegin++;
+          OrigLength++;
+        }
+        buf += *argListBegin;
+        buf += "*/";
+      }
+      else
+        buf += *argListBegin;
+      argListBegin++;
+      OrigLength++;
+    }
+    buf += ')';
+    OrigLength++;
+  }
+  ReplaceText(Start, OrigLength, buf);
+}
+
+/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
+/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
+///                    struct Block_byref_id_object *src) {
+///  _Block_object_assign (&_dest->object, _src->object,
+///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
+///                        [|BLOCK_FIELD_IS_WEAK]) // object
+///  _Block_object_assign(&_dest->object, _src->object,
+///                       BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
+///                       [|BLOCK_FIELD_IS_WEAK]) // block
+/// }
+/// And:
+/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
+///  _Block_object_dispose(_src->object,
+///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
+///                        [|BLOCK_FIELD_IS_WEAK]) // object
+///  _Block_object_dispose(_src->object,
+///                         BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
+///                         [|BLOCK_FIELD_IS_WEAK]) // block
+/// }
+
+std::string RewriteObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
+                                                          int flag) {
+  std::string S;
+  if (CopyDestroyCache.count(flag))
+    return S;
+  CopyDestroyCache.insert(flag);
+  S = "static void __Block_byref_id_object_copy_";
+  S += utostr(flag);
+  S += "(void *dst, void *src) {\n";
+
+  // offset into the object pointer is computed as:
+  // void * + void* + int + int + void* + void *
+  unsigned IntSize =
+  static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+  unsigned VoidPtrSize =
+  static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
+
+  unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
+  S += " _Block_object_assign((char*)dst + ";
+  S += utostr(offset);
+  S += ", *(void * *) ((char*)src + ";
+  S += utostr(offset);
+  S += "), ";
+  S += utostr(flag);
+  S += ");\n}\n";
+
+  S += "static void __Block_byref_id_object_dispose_";
+  S += utostr(flag);
+  S += "(void *src) {\n";
+  S += " _Block_object_dispose(*(void * *) ((char*)src + ";
+  S += utostr(offset);
+  S += "), ";
+  S += utostr(flag);
+  S += ");\n}\n";
+  return S;
+}
+
+/// RewriteByRefVar - For each __block typex ND variable this routine transforms
+/// the declaration into:
+/// struct __Block_byref_ND {
+/// void *__isa;                  // NULL for everything except __weak pointers
+/// struct __Block_byref_ND *__forwarding;
+/// int32_t __flags;
+/// int32_t __size;
+/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
+/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
+/// typex ND;
+/// };
+///
+/// It then replaces declaration of ND variable with:
+/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
+///                               __size=sizeof(struct __Block_byref_ND),
+///                               ND=initializer-if-any};
+///
+///
+void RewriteObjC::RewriteByRefVar(VarDecl *ND) {
+  // Insert declaration for the function in which block literal is
+  // used.
+  if (CurFunctionDeclToDeclareForBlock)
+    RewriteBlockLiteralFunctionDecl(CurFunctionDeclToDeclareForBlock);
+  int flag = 0;
+  int isa = 0;
+  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
+  if (DeclLoc.isInvalid())
+    // If type location is missing, it is because of missing type (a warning).
+    // Use variable's location which is good for this case.
+    DeclLoc = ND->getLocation();
+  const char *startBuf = SM->getCharacterData(DeclLoc);
+  SourceLocation X = ND->getEndLoc();
+  X = SM->getExpansionLoc(X);
+  const char *endBuf = SM->getCharacterData(X);
+  std::string Name(ND->getNameAsString());
+  std::string ByrefType;
+  RewriteByRefString(ByrefType, Name, ND, true);
+  ByrefType += " {\n";
+  ByrefType += "  void *__isa;\n";
+  RewriteByRefString(ByrefType, Name, ND);
+  ByrefType += " *__forwarding;\n";
+  ByrefType += " int __flags;\n";
+  ByrefType += " int __size;\n";
+  // Add void *__Block_byref_id_object_copy;
+  // void *__Block_byref_id_object_dispose; if needed.
+  QualType Ty = ND->getType();
+  bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
+  if (HasCopyAndDispose) {
+    ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
+    ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
+  }
+
+  QualType T = Ty;
+  (void)convertBlockPointerToFunctionPointer(T);
+  T.getAsStringInternal(Name, Context->getPrintingPolicy());
+
+  ByrefType += " " + Name + ";\n";
+  ByrefType += "};\n";
+  // Insert this type in global scope. It is needed by helper function.
+  SourceLocation FunLocStart;
+  if (CurFunctionDef)
+     FunLocStart = CurFunctionDef->getTypeSpecStartLoc();
+  else {
+    assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
+    FunLocStart = CurMethodDef->getBeginLoc();
+  }
+  InsertText(FunLocStart, ByrefType);
+  if (Ty.isObjCGCWeak()) {
+    flag |= BLOCK_FIELD_IS_WEAK;
+    isa = 1;
+  }
+
+  if (HasCopyAndDispose) {
+    flag = BLOCK_BYREF_CALLER;
+    QualType Ty = ND->getType();
+    // FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
+    if (Ty->isBlockPointerType())
+      flag |= BLOCK_FIELD_IS_BLOCK;
+    else
+      flag |= BLOCK_FIELD_IS_OBJECT;
+    std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
+    if (!HF.empty())
+      InsertText(FunLocStart, HF);
+  }
+
+  // struct __Block_byref_ND ND =
+  // {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
+  //  initializer-if-any};
+  bool hasInit = (ND->getInit() != nullptr);
+  unsigned flags = 0;
+  if (HasCopyAndDispose)
+    flags |= BLOCK_HAS_COPY_DISPOSE;
+  Name = ND->getNameAsString();
+  ByrefType.clear();
+  RewriteByRefString(ByrefType, Name, ND);
+  std::string ForwardingCastType("(");
+  ForwardingCastType += ByrefType + " *)";
+  if (!hasInit) {
+    ByrefType += " " + Name + " = {(void*)";
+    ByrefType += utostr(isa);
+    ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
+    ByrefType += utostr(flags);
+    ByrefType += ", ";
+    ByrefType += "sizeof(";
+    RewriteByRefString(ByrefType, Name, ND);
+    ByrefType += ")";
+    if (HasCopyAndDispose) {
+      ByrefType += ", __Block_byref_id_object_copy_";
+      ByrefType += utostr(flag);
+      ByrefType += ", __Block_byref_id_object_dispose_";
+      ByrefType += utostr(flag);
+    }
+    ByrefType += "};\n";
+    unsigned nameSize = Name.size();
+    // for block or function pointer declaration. Name is already
+    // part of the declaration.
+    if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
+      nameSize = 1;
+    ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
+  }
+  else {
+    SourceLocation startLoc;
+    Expr *E = ND->getInit();
+    if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
+      startLoc = ECE->getLParenLoc();
+    else
+      startLoc = E->getBeginLoc();
+    startLoc = SM->getExpansionLoc(startLoc);
+    endBuf = SM->getCharacterData(startLoc);
+    ByrefType += " " + Name;
+    ByrefType += " = {(void*)";
+    ByrefType += utostr(isa);
+    ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
+    ByrefType += utostr(flags);
+    ByrefType += ", ";
+    ByrefType += "sizeof(";
+    RewriteByRefString(ByrefType, Name, ND);
+    ByrefType += "), ";
+    if (HasCopyAndDispose) {
+      ByrefType += "__Block_byref_id_object_copy_";
+      ByrefType += utostr(flag);
+      ByrefType += ", __Block_byref_id_object_dispose_";
+      ByrefType += utostr(flag);
+      ByrefType += ", ";
+    }
+    ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
+
+    // Complete the newly synthesized compound expression by inserting a right
+    // curly brace before the end of the declaration.
+    // FIXME: This approach avoids rewriting the initializer expression. It
+    // also assumes there is only one declarator. For example, the following
+    // isn't currently supported by this routine (in general):
+    //
+    // double __block BYREFVAR = 1.34, BYREFVAR2 = 1.37;
+    //
+    const char *startInitializerBuf = SM->getCharacterData(startLoc);
+    const char *semiBuf = strchr(startInitializerBuf, ';');
+    assert((*semiBuf == ';') && "RewriteByRefVar: can't find ';'");
+    SourceLocation semiLoc =
+      startLoc.getLocWithOffset(semiBuf-startInitializerBuf);
+
+    InsertText(semiLoc, "}");
+  }
+}
+
+void RewriteObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
+  // Add initializers for any closure decl refs.
+  GetBlockDeclRefExprs(Exp->getBody());
+  if (BlockDeclRefs.size()) {
+    // Unique all "by copy" declarations.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
+        if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
+          BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
+          BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
+        }
+      }
+    // Unique all "by ref" declarations.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
+        if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
+          BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
+          BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
+        }
+      }
+    // Find any imported blocks...they will need special attention.
+    for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
+      if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
+          BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
+          BlockDeclRefs[i]->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
+  }
+}
+
+FunctionDecl *RewriteObjC::SynthBlockInitFunctionDecl(StringRef name) {
+  IdentifierInfo *ID = &Context->Idents.get(name);
+  QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
+  return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
+                              SourceLocation(), ID, FType, nullptr, SC_Extern,
+                              false, false);
+}
+
+Stmt *RewriteObjC::SynthBlockInitExpr(BlockExpr *Exp,
+                     const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
+  const BlockDecl *block = Exp->getBlockDecl();
+  Blocks.push_back(Exp);
+
+  CollectBlockDeclRefInfo(Exp);
+
+  // Add inner imported variables now used in current block.
+ int countOfInnerDecls = 0;
+  if (!InnerBlockDeclRefs.empty()) {
+    for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
+      DeclRefExpr *Exp = InnerBlockDeclRefs[i];
+      ValueDecl *VD = Exp->getDecl();
+      if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
+      // We need to save the copied-in variables in nested
+      // blocks because it is needed at the end for some of the API generations.
+      // See SynthesizeBlockLiterals routine.
+        InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
+        BlockDeclRefs.push_back(Exp);
+        BlockByCopyDeclsPtrSet.insert(VD);
+        BlockByCopyDecls.push_back(VD);
+      }
+      if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
+        InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
+        BlockDeclRefs.push_back(Exp);
+        BlockByRefDeclsPtrSet.insert(VD);
+        BlockByRefDecls.push_back(VD);
+      }
+    }
+    // Find any imported blocks...they will need special attention.
+    for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
+      if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
+          InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
+          InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
+        ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
+  }
+  InnerDeclRefsCount.push_back(countOfInnerDecls);
+
+  std::string FuncName;
+
+  if (CurFunctionDef)
+    FuncName = CurFunctionDef->getNameAsString();
+  else if (CurMethodDef)
+    BuildUniqueMethodName(FuncName, CurMethodDef);
+  else if (GlobalVarDecl)
+    FuncName = std::string(GlobalVarDecl->getNameAsString());
+
+  std::string BlockNumber = utostr(Blocks.size()-1);
+
+  std::string Tag = "__" + FuncName + "_block_impl_" + BlockNumber;
+  std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
+
+  // Get a pointer to the function type so we can cast appropriately.
+  QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
+  QualType FType = Context->getPointerType(BFT);
+
+  FunctionDecl *FD;
+  Expr *NewRep;
+
+  // Simulate a constructor call...
+  FD = SynthBlockInitFunctionDecl(Tag);
+  DeclRefExpr *DRE = new (Context)
+      DeclRefExpr(*Context, FD, false, FType, VK_PRValue, SourceLocation());
+
+  SmallVector<Expr*, 4> InitExprs;
+
+  // Initialize the block function.
+  FD = SynthBlockInitFunctionDecl(Func);
+  DeclRefExpr *Arg = new (Context) DeclRefExpr(
+      *Context, FD, false, FD->getType(), VK_LValue, SourceLocation());
+  CastExpr *castExpr =
+      NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy, CK_BitCast, Arg);
+  InitExprs.push_back(castExpr);
+
+  // Initialize the block descriptor.
+  std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
+
+  VarDecl *NewVD = VarDecl::Create(
+      *Context, TUDecl, SourceLocation(), SourceLocation(),
+      &Context->Idents.get(DescData), Context->VoidPtrTy, nullptr, SC_Static);
+  UnaryOperator *DescRefExpr = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context),
+      new (Context) DeclRefExpr(*Context, NewVD, false, Context->VoidPtrTy,
+                                VK_LValue, SourceLocation()),
+      UO_AddrOf, Context->getPointerType(Context->VoidPtrTy), VK_PRValue,
+      OK_Ordinary, SourceLocation(), false, FPOptionsOverride());
+  InitExprs.push_back(DescRefExpr);
+
+  // Add initializers for any closure decl refs.
+  if (BlockDeclRefs.size()) {
+    Expr *Exp;
+    // Output all "by copy" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
+         E = BlockByCopyDecls.end(); I != E; ++I) {
+      if (isObjCType((*I)->getType())) {
+        // FIXME: Conform to ABI ([[obj retain] autorelease]).
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                        VK_LValue, SourceLocation());
+        if (HasLocalVariableExternalStorage(*I)) {
+          QualType QT = (*I)->getType();
+          QT = Context->getPointerType(QT);
+          Exp = UnaryOperator::Create(const_cast<ASTContext &>(*Context), Exp,
+                                      UO_AddrOf, QT, VK_PRValue, OK_Ordinary,
+                                      SourceLocation(), false,
+                                      FPOptionsOverride());
+        }
+      } else if (isTopLevelBlockPointerType((*I)->getType())) {
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Arg = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                        VK_LValue, SourceLocation());
+        Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy, CK_BitCast,
+                                       Arg);
+      } else {
+        FD = SynthBlockInitFunctionDecl((*I)->getName());
+        Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                        VK_LValue, SourceLocation());
+        if (HasLocalVariableExternalStorage(*I)) {
+          QualType QT = (*I)->getType();
+          QT = Context->getPointerType(QT);
+          Exp = UnaryOperator::Create(const_cast<ASTContext &>(*Context), Exp,
+                                      UO_AddrOf, QT, VK_PRValue, OK_Ordinary,
+                                      SourceLocation(), false,
+                                      FPOptionsOverride());
+        }
+      }
+      InitExprs.push_back(Exp);
+    }
+    // Output all "by ref" declarations.
+    for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
+         E = BlockByRefDecls.end(); I != E; ++I) {
+      ValueDecl *ND = (*I);
+      std::string Name(ND->getNameAsString());
+      std::string RecName;
+      RewriteByRefString(RecName, Name, ND, true);
+      IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
+                                                + sizeof("struct"));
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+
+      FD = SynthBlockInitFunctionDecl((*I)->getName());
+      Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
+                                      VK_LValue, SourceLocation());
+      bool isNestedCapturedVar = false;
+      if (block)
+        for (const auto &CI : block->captures()) {
+          const VarDecl *variable = CI.getVariable();
+          if (variable == ND && CI.isNested()) {
+            assert (CI.isByRef() &&
+                    "SynthBlockInitExpr - captured block variable is not byref");
+            isNestedCapturedVar = true;
+            break;
+          }
+        }
+      // captured nested byref variable has its address passed. Do not take
+      // its address again.
+      if (!isNestedCapturedVar)
+        Exp = UnaryOperator::Create(
+            const_cast<ASTContext &>(*Context), Exp, UO_AddrOf,
+            Context->getPointerType(Exp->getType()), VK_PRValue, OK_Ordinary,
+            SourceLocation(), false, FPOptionsOverride());
+      Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
+      InitExprs.push_back(Exp);
+    }
+  }
+  if (ImportedBlockDecls.size()) {
+    // generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
+    int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
+    unsigned IntSize =
+      static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
+    Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
+                                           Context->IntTy, SourceLocation());
+    InitExprs.push_back(FlagExp);
+  }
+  NewRep = CallExpr::Create(*Context, DRE, InitExprs, FType, VK_LValue,
+                            SourceLocation(), FPOptionsOverride());
+  NewRep = UnaryOperator::Create(
+      const_cast<ASTContext &>(*Context), NewRep, UO_AddrOf,
+      Context->getPointerType(NewRep->getType()), VK_PRValue, OK_Ordinary,
+      SourceLocation(), false, FPOptionsOverride());
+  NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
+                                    NewRep);
+  BlockDeclRefs.clear();
+  BlockByRefDecls.clear();
+  BlockByRefDeclsPtrSet.clear();
+  BlockByCopyDecls.clear();
+  BlockByCopyDeclsPtrSet.clear();
+  ImportedBlockDecls.clear();
+  return NewRep;
+}
+
+bool RewriteObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
+  if (const ObjCForCollectionStmt * CS =
+      dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
+        return CS->getElement() == DS;
+  return false;
+}
+
+//===----------------------------------------------------------------------===//
+// Function Body / Expression rewriting
+//===----------------------------------------------------------------------===//
+
+Stmt *RewriteObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
+  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
+      isa<DoStmt>(S) || isa<ForStmt>(S))
+    Stmts.push_back(S);
+  else if (isa<ObjCForCollectionStmt>(S)) {
+    Stmts.push_back(S);
+    ObjCBcLabelNo.push_back(++BcLabelCount);
+  }
+
+  // Pseudo-object operations and ivar references need special
+  // treatment because we're going to recursively rewrite them.
+  if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
+    if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
+      return RewritePropertyOrImplicitSetter(PseudoOp);
+    } else {
+      return RewritePropertyOrImplicitGetter(PseudoOp);
+    }
+  } else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
+    return RewriteObjCIvarRefExpr(IvarRefExpr);
+  }
+
+  SourceRange OrigStmtRange = S->getSourceRange();
+
+  // Perform a bottom up rewrite of all children.
+  for (Stmt *&childStmt : S->children())
+    if (childStmt) {
+      Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
+      if (newStmt) {
+        childStmt = newStmt;
+      }
+    }
+
+  if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
+    SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
+    llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
+    InnerContexts.insert(BE->getBlockDecl());
+    ImportedLocalExternalDecls.clear();
+    GetInnerBlockDeclRefExprs(BE->getBody(),
+                              InnerBlockDeclRefs, InnerContexts);
+    // Rewrite the block body in place.
+    Stmt *SaveCurrentBody = CurrentBody;
+    CurrentBody = BE->getBody();
+    PropParentMap = nullptr;
+    // block literal on rhs of a property-dot-sytax assignment
+    // must be replaced by its synthesize ast so getRewrittenText
+    // works as expected. In this case, what actually ends up on RHS
+    // is the blockTranscribed which is the helper function for the
+    // block literal; as in: self.c = ^() {[ace ARR];};
+    bool saveDisableReplaceStmt = DisableReplaceStmt;
+    DisableReplaceStmt = false;
+    RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
+    DisableReplaceStmt = saveDisableReplaceStmt;
+    CurrentBody = SaveCurrentBody;
+    PropParentMap = nullptr;
+    ImportedLocalExternalDecls.clear();
+    // Now we snarf the rewritten text and stash it away for later use.
+    std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
+    RewrittenBlockExprs[BE] = Str;
+
+    Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
+
+    //blockTranscribed->dump();
+    ReplaceStmt(S, blockTranscribed);
+    return blockTranscribed;
+  }
+  // Handle specific things.
+  if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
+    return RewriteAtEncode(AtEncode);
+
+  if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
+    return RewriteAtSelector(AtSelector);
+
+  if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
+    return RewriteObjCStringLiteral(AtString);
+
+  if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
+#if 0
+    // Before we rewrite it, put the original message expression in a comment.
+    SourceLocation startLoc = MessExpr->getBeginLoc();
+    SourceLocation endLoc = MessExpr->getEndLoc();
+
+    const char *startBuf = SM->getCharacterData(startLoc);
+    const char *endBuf = SM->getCharacterData(endLoc);
+
+    std::string messString;
+    messString += "// ";
+    messString.append(startBuf, endBuf-startBuf+1);
+    messString += "\n";
+
+    // FIXME: Missing definition of
+    // InsertText(clang::SourceLocation, char const*, unsigned int).
+    // InsertText(startLoc, messString);
+    // Tried this, but it didn't work either...
+    // ReplaceText(startLoc, 0, messString.c_str(), messString.size());
+#endif
+    return RewriteMessageExpr(MessExpr);
+  }
+
+  if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
+    return RewriteObjCTryStmt(StmtTry);
+
+  if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
+    return RewriteObjCSynchronizedStmt(StmtTry);
+
+  if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
+    return RewriteObjCThrowStmt(StmtThrow);
+
+  if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
+    return RewriteObjCProtocolExpr(ProtocolExp);
+
+  if (ObjCForCollectionStmt *StmtForCollection =
+        dyn_cast<ObjCForCollectionStmt>(S))
+    return RewriteObjCForCollectionStmt(StmtForCollection,
+                                        OrigStmtRange.getEnd());
+  if (BreakStmt *StmtBreakStmt =
+      dyn_cast<BreakStmt>(S))
+    return RewriteBreakStmt(StmtBreakStmt);
+  if (ContinueStmt *StmtContinueStmt =
+      dyn_cast<ContinueStmt>(S))
+    return RewriteContinueStmt(StmtContinueStmt);
+
+  // Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
+  // and cast exprs.
+  if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
+    // FIXME: What we're doing here is modifying the type-specifier that
+    // precedes the first Decl.  In the future the DeclGroup should have
+    // a separate type-specifier that we can rewrite.
+    // NOTE: We need to avoid rewriting the DeclStmt if it is within
+    // the context of an ObjCForCollectionStmt. For example:
+    //   NSArray *someArray;
+    //   for (id <FooProtocol> index in someArray) ;
+    // This is because RewriteObjCForCollectionStmt() does textual rewriting
+    // and it depends on the original text locations/positions.
+    if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
+      RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
+
+    // Blocks rewrite rules.
+    for (auto *SD : DS->decls()) {
+      if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
+        if (isTopLevelBlockPointerType(ND->getType()))
+          RewriteBlockPointerDecl(ND);
+        else if (ND->getType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(ND->getType(), ND);
+        if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
+          if (VD->hasAttr<BlocksAttr>()) {
+            static unsigned uniqueByrefDeclCount = 0;
+            assert(!BlockByRefDeclNo.count(ND) &&
+              "RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
+            BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
+            RewriteByRefVar(VD);
+          }
+          else
+            RewriteTypeOfDecl(VD);
+        }
+      }
+      if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
+        if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+          RewriteBlockPointerDecl(TD);
+        else if (TD->getUnderlyingType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+      }
+    }
+  }
+
+  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
+    RewriteObjCQualifiedInterfaceTypes(CE);
+
+  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
+      isa<DoStmt>(S) || isa<ForStmt>(S)) {
+    assert(!Stmts.empty() && "Statement stack is empty");
+    assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
+             isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
+            && "Statement stack mismatch");
+    Stmts.pop_back();
+  }
+  // Handle blocks rewriting.
+  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
+    ValueDecl *VD = DRE->getDecl();
+    if (VD->hasAttr<BlocksAttr>())
+      return RewriteBlockDeclRefExpr(DRE);
+    if (HasLocalVariableExternalStorage(VD))
+      return RewriteLocalVariableExternalStorage(DRE);
+  }
+
+  if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
+    if (CE->getCallee()->getType()->isBlockPointerType()) {
+      Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
+      ReplaceStmt(S, BlockCall);
+      return BlockCall;
+    }
+  }
+  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
+    RewriteCastExpr(CE);
+  }
+#if 0
+  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
+    CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
+                                                   ICE->getSubExpr(),
+                                                   SourceLocation());
+    // Get the new text.
+    std::string SStr;
+    llvm::raw_string_ostream Buf(SStr);
+    Replacement->printPretty(Buf);
+    const std::string &Str = Buf.str();
+
+    printf("CAST = %s\n", &Str[0]);
+    InsertText(ICE->getSubExpr()->getBeginLoc(), Str);
+    delete S;
+    return Replacement;
+  }
+#endif
+  // Return this stmt unmodified.
+  return S;
+}
+
+void RewriteObjC::RewriteRecordBody(RecordDecl *RD) {
+  for (auto *FD : RD->fields()) {
+    if (isTopLevelBlockPointerType(FD->getType()))
+      RewriteBlockPointerDecl(FD);
+    if (FD->getType()->isObjCQualifiedIdType() ||
+        FD->getType()->isObjCQualifiedInterfaceType())
+      RewriteObjCQualifiedInterfaceTypes(FD);
+  }
+}
+
+/// HandleDeclInMainFile - This is called for each top-level decl defined in the
+/// main file of the input.
+void RewriteObjC::HandleDeclInMainFile(Decl *D) {
+  switch (D->getKind()) {
+    case Decl::Function: {
+      FunctionDecl *FD = cast<FunctionDecl>(D);
+      if (FD->isOverloadedOperator())
+        return;
+
+      // Since function prototypes don't have ParmDecl's, we check the function
+      // prototype. This enables us to rewrite function declarations and
+      // definitions using the same code.
+      RewriteBlocksInFunctionProtoType(FD->getType(), FD);
+
+      if (!FD->isThisDeclarationADefinition())
+        break;
+
+      // FIXME: If this should support Obj-C++, support CXXTryStmt
+      if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
+        CurFunctionDef = FD;
+        CurFunctionDeclToDeclareForBlock = FD;
+        CurrentBody = Body;
+        Body =
+        cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
+        FD->setBody(Body);
+        CurrentBody = nullptr;
+        if (PropParentMap) {
+          delete PropParentMap;
+          PropParentMap = nullptr;
+        }
+        // This synthesizes and inserts the block "impl" struct, invoke function,
+        // and any copy/dispose helper functions.
+        InsertBlockLiteralsWithinFunction(FD);
+        CurFunctionDef = nullptr;
+        CurFunctionDeclToDeclareForBlock = nullptr;
+      }
+      break;
+    }
+    case Decl::ObjCMethod: {
+      ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
+      if (CompoundStmt *Body = MD->getCompoundBody()) {
+        CurMethodDef = MD;
+        CurrentBody = Body;
+        Body =
+          cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
+        MD->setBody(Body);
+        CurrentBody = nullptr;
+        if (PropParentMap) {
+          delete PropParentMap;
+          PropParentMap = nullptr;
+        }
+        InsertBlockLiteralsWithinMethod(MD);
+        CurMethodDef = nullptr;
+      }
+      break;
+    }
+    case Decl::ObjCImplementation: {
+      ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(D);
+      ClassImplementation.push_back(CI);
+      break;
+    }
+    case Decl::ObjCCategoryImpl: {
+      ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(D);
+      CategoryImplementation.push_back(CI);
+      break;
+    }
+    case Decl::Var: {
+      VarDecl *VD = cast<VarDecl>(D);
+      RewriteObjCQualifiedInterfaceTypes(VD);
+      if (isTopLevelBlockPointerType(VD->getType()))
+        RewriteBlockPointerDecl(VD);
+      else if (VD->getType()->isFunctionPointerType()) {
+        CheckFunctionPointerDecl(VD->getType(), VD);
+        if (VD->getInit()) {
+          if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
+            RewriteCastExpr(CE);
+          }
+        }
+      } else if (VD->getType()->isRecordType()) {
+        RecordDecl *RD = VD->getType()->castAs<RecordType>()->getDecl();
+        if (RD->isCompleteDefinition())
+          RewriteRecordBody(RD);
+      }
+      if (VD->getInit()) {
+        GlobalVarDecl = VD;
+        CurrentBody = VD->getInit();
+        RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
+        CurrentBody = nullptr;
+        if (PropParentMap) {
+          delete PropParentMap;
+          PropParentMap = nullptr;
+        }
+        SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(), VD->getName());
+        GlobalVarDecl = nullptr;
+
+        // This is needed for blocks.
+        if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
+            RewriteCastExpr(CE);
+        }
+      }
+      break;
+    }
+    case Decl::TypeAlias:
+    case Decl::Typedef: {
+      if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
+        if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
+          RewriteBlockPointerDecl(TD);
+        else if (TD->getUnderlyingType()->isFunctionPointerType())
+          CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
+      }
+      break;
+    }
+    case Decl::CXXRecord:
+    case Decl::Record: {
+      RecordDecl *RD = cast<RecordDecl>(D);
+      if (RD->isCompleteDefinition())
+        RewriteRecordBody(RD);
+      break;
+    }
+    default:
+      break;
+  }
+  // Nothing yet.
+}
+
+void RewriteObjC::HandleTranslationUnit(ASTContext &C) {
+  if (Diags.hasErrorOccurred())
+    return;
+
+  RewriteInclude();
+
+  // Here's a great place to add any extra declarations that may be needed.
+  // Write out meta data for each @protocol(<expr>).
+  for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls)
+    RewriteObjCProtocolMetaData(ProtDecl, "", "", Preamble);
+
+  InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
+  if (ClassImplementation.size() || CategoryImplementation.size())
+    RewriteImplementations();
+
+  // Get the buffer corresponding to MainFileID.  If we haven't changed it, then
+  // we are done.
+  if (const RewriteBuffer *RewriteBuf =
+      Rewrite.getRewriteBufferFor(MainFileID)) {
+    //printf("Changed:\n");
+    *OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
+  } else {
+    llvm::errs() << "No changes\n";
+  }
+
+  if (ClassImplementation.size() || CategoryImplementation.size() ||
+      ProtocolExprDecls.size()) {
+    // Rewrite Objective-c meta data*
+    std::string ResultStr;
+    RewriteMetaDataIntoBuffer(ResultStr);
+    // Emit metadata.
+    *OutFile << ResultStr;
+  }
+  OutFile->flush();
+}
+
+void RewriteObjCFragileABI::Initialize(ASTContext &context) {
+  InitializeCommon(context);
+
+  // declaring objc_selector outside the parameter list removes a silly
+  // scope related warning...
+  if (IsHeader)
+    Preamble = "#pragma once\n";
+  Preamble += "struct objc_selector; struct objc_class;\n";
+  Preamble += "struct __rw_objc_super { struct objc_object *object; ";
+  Preamble += "struct objc_object *superClass; ";
+  if (LangOpts.MicrosoftExt) {
+    // Add a constructor for creating temporary objects.
+    Preamble += "__rw_objc_super(struct objc_object *o, struct objc_object *s) "
+    ": ";
+    Preamble += "object(o), superClass(s) {} ";
+  }
+  Preamble += "};\n";
+  Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
+  Preamble += "typedef struct objc_object Protocol;\n";
+  Preamble += "#define _REWRITER_typedef_Protocol\n";
+  Preamble += "#endif\n";
+  if (LangOpts.MicrosoftExt) {
+    Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
+    Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
+  } else
+    Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSend";
+  Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSendSuper";
+  Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object* objc_msgSend_stret";
+  Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object* objc_msgSendSuper_stret";
+  Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT double objc_msgSend_fpret";
+  Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getClass";
+  Preamble += "(const char *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
+  Preamble += "(struct objc_class *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getMetaClass";
+  Preamble += "(const char *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw(struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_enter(void *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_exit(void *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_exception_extract(void *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int objc_exception_match";
+  Preamble += "(struct objc_class *, struct objc_object *);\n";
+  // @synchronized hooks.
+  Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter(struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit(struct objc_object *);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
+  Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
+  Preamble += "struct __objcFastEnumerationState {\n\t";
+  Preamble += "unsigned long state;\n\t";
+  Preamble += "void **itemsPtr;\n\t";
+  Preamble += "unsigned long *mutationsPtr;\n\t";
+  Preamble += "unsigned long extra[5];\n};\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
+  Preamble += "#define __FASTENUMERATIONSTATE\n";
+  Preamble += "#endif\n";
+  Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
+  Preamble += "struct __NSConstantStringImpl {\n";
+  Preamble += "  int *isa;\n";
+  Preamble += "  int flags;\n";
+  Preamble += "  char *str;\n";
+  Preamble += "  long length;\n";
+  Preamble += "};\n";
+  Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
+  Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
+  Preamble += "#else\n";
+  Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
+  Preamble += "#endif\n";
+  Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
+  Preamble += "#endif\n";
+  // Blocks preamble.
+  Preamble += "#ifndef BLOCK_IMPL\n";
+  Preamble += "#define BLOCK_IMPL\n";
+  Preamble += "struct __block_impl {\n";
+  Preamble += "  void *isa;\n";
+  Preamble += "  int Flags;\n";
+  Preamble += "  int Reserved;\n";
+  Preamble += "  void *FuncPtr;\n";
+  Preamble += "};\n";
+  Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
+  Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
+  Preamble += "extern \"C\" __declspec(dllexport) "
+  "void _Block_object_assign(void *, const void *, const int);\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
+  Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
+  Preamble += "#else\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
+  Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
+  Preamble += "#endif\n";
+  Preamble += "#endif\n";
+  if (LangOpts.MicrosoftExt) {
+    Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
+    Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
+    Preamble += "#ifndef KEEP_ATTRIBUTES\n";  // We use this for clang tests.
+    Preamble += "#define __attribute__(X)\n";
+    Preamble += "#endif\n";
+    Preamble += "#define __weak\n";
+  }
+  else {
+    Preamble += "#define __block\n";
+    Preamble += "#define __weak\n";
+  }
+  // NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
+  // as this avoids warning in any 64bit/32bit compilation model.
+  Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
+}
+
+/// RewriteIvarOffsetComputation - This routine synthesizes computation of
+/// ivar offset.
+void RewriteObjCFragileABI::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
+                                                         std::string &Result) {
+  if (ivar->isBitField()) {
+    // FIXME: The hack below doesn't work for bitfields. For now, we simply
+    // place all bitfields at offset 0.
+    Result += "0";
+  } else {
+    Result += "__OFFSETOFIVAR__(struct ";
+    Result += ivar->getContainingInterface()->getNameAsString();
+    if (LangOpts.MicrosoftExt)
+      Result += "_IMPL";
+    Result += ", ";
+    Result += ivar->getNameAsString();
+    Result += ")";
+  }
+}
+
+/// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
+void RewriteObjCFragileABI::RewriteObjCProtocolMetaData(
+                            ObjCProtocolDecl *PDecl, StringRef prefix,
+                            StringRef ClassName, std::string &Result) {
+  static bool objc_protocol_methods = false;
+
+  // Output struct protocol_methods holder of method selector and type.
+  if (!objc_protocol_methods && PDecl->hasDefinition()) {
+    /* struct protocol_methods {
+     SEL _cmd;
+     char *method_types;
+     }
+     */
+    Result += "\nstruct _protocol_methods {\n";
+    Result += "\tstruct objc_selector *_cmd;\n";
+    Result += "\tchar *method_types;\n";
+    Result += "};\n";
+
+    objc_protocol_methods = true;
+  }
+  // Do not synthesize the protocol more than once.
+  if (ObjCSynthesizedProtocols.count(PDecl->getCanonicalDecl()))
+    return;
+
+  if (ObjCProtocolDecl *Def = PDecl->getDefinition())
+    PDecl = Def;
+
+  if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
+    unsigned NumMethods = std::distance(PDecl->instmeth_begin(),
+                                        PDecl->instmeth_end());
+    /* struct _objc_protocol_method_list {
+     int protocol_method_count;
+     struct protocol_methods protocols[];
+     }
+     */
+    Result += "\nstatic struct {\n";
+    Result += "\tint protocol_method_count;\n";
+    Result += "\tstruct _protocol_methods protocol_methods[";
+    Result += utostr(NumMethods);
+    Result += "];\n} _OBJC_PROTOCOL_INSTANCE_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__OBJC, __cat_inst_meth\")))= "
+    "{\n\t" + utostr(NumMethods) + "\n";
+
+    // Output instance methods declared in this protocol.
+    for (ObjCProtocolDecl::instmeth_iterator
+         I = PDecl->instmeth_begin(), E = PDecl->instmeth_end();
+         I != E; ++I) {
+      if (I == PDecl->instmeth_begin())
+        Result += "\t  ,{{(struct objc_selector *)\"";
+      else
+        Result += "\t  ,{(struct objc_selector *)\"";
+      Result += (*I)->getSelector().getAsString();
+      std::string MethodTypeString = Context->getObjCEncodingForMethodDecl(*I);
+      Result += "\", \"";
+      Result += MethodTypeString;
+      Result += "\"}\n";
+    }
+    Result += "\t }\n};\n";
+  }
+
+  // Output class methods declared in this protocol.
+  unsigned NumMethods = std::distance(PDecl->classmeth_begin(),
+                                      PDecl->classmeth_end());
+  if (NumMethods > 0) {
+    /* struct _objc_protocol_method_list {
+     int protocol_method_count;
+     struct protocol_methods protocols[];
+     }
+     */
+    Result += "\nstatic struct {\n";
+    Result += "\tint protocol_method_count;\n";
+    Result += "\tstruct _protocol_methods protocol_methods[";
+    Result += utostr(NumMethods);
+    Result += "];\n} _OBJC_PROTOCOL_CLASS_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
+    "{\n\t";
+    Result += utostr(NumMethods);
+    Result += "\n";
+
+    // Output instance methods declared in this protocol.
+    for (ObjCProtocolDecl::classmeth_iterator
+         I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
+         I != E; ++I) {
+      if (I == PDecl->classmeth_begin())
+        Result += "\t  ,{{(struct objc_selector *)\"";
+      else
+        Result += "\t  ,{(struct objc_selector *)\"";
+      Result += (*I)->getSelector().getAsString();
+      std::string MethodTypeString = Context->getObjCEncodingForMethodDecl(*I);
+      Result += "\", \"";
+      Result += MethodTypeString;
+      Result += "\"}\n";
+    }
+    Result += "\t }\n};\n";
+  }
+
+  // Output:
+  /* struct _objc_protocol {
+   // Objective-C 1.0 extensions
+   struct _objc_protocol_extension *isa;
+   char *protocol_name;
+   struct _objc_protocol **protocol_list;
+   struct _objc_protocol_method_list *instance_methods;
+   struct _objc_protocol_method_list *class_methods;
+   };
+   */
+  static bool objc_protocol = false;
+  if (!objc_protocol) {
+    Result += "\nstruct _objc_protocol {\n";
+    Result += "\tstruct _objc_protocol_extension *isa;\n";
+    Result += "\tchar *protocol_name;\n";
+    Result += "\tstruct _objc_protocol **protocol_list;\n";
+    Result += "\tstruct _objc_protocol_method_list *instance_methods;\n";
+    Result += "\tstruct _objc_protocol_method_list *class_methods;\n";
+    Result += "};\n";
+
+    objc_protocol = true;
+  }
+
+  Result += "\nstatic struct _objc_protocol _OBJC_PROTOCOL_";
+  Result += PDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__OBJC, __protocol\")))= "
+  "{\n\t0, \"";
+  Result += PDecl->getNameAsString();
+  Result += "\", 0, ";
+  if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
+    Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += ", ";
+  }
+  else
+    Result += "0, ";
+  if (PDecl->classmeth_begin() != PDecl->classmeth_end()) {
+    Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_CLASS_METHODS_";
+    Result += PDecl->getNameAsString();
+    Result += "\n";
+  }
+  else
+    Result += "0\n";
+  Result += "};\n";
+
+  // Mark this protocol as having been generated.
+  if (!ObjCSynthesizedProtocols.insert(PDecl->getCanonicalDecl()).second)
+    llvm_unreachable("protocol already synthesized");
+}
+
+void RewriteObjCFragileABI::RewriteObjCProtocolListMetaData(
+                                const ObjCList<ObjCProtocolDecl> &Protocols,
+                                StringRef prefix, StringRef ClassName,
+                                std::string &Result) {
+  if (Protocols.empty()) return;
+
+  for (unsigned i = 0; i != Protocols.size(); i++)
+    RewriteObjCProtocolMetaData(Protocols[i], prefix, ClassName, Result);
+
+  // Output the top lovel protocol meta-data for the class.
+  /* struct _objc_protocol_list {
+   struct _objc_protocol_list *next;
+   int    protocol_count;
+   struct _objc_protocol *class_protocols[];
+   }
+   */
+  Result += "\nstatic struct {\n";
+  Result += "\tstruct _objc_protocol_list *next;\n";
+  Result += "\tint    protocol_count;\n";
+  Result += "\tstruct _objc_protocol *class_protocols[";
+  Result += utostr(Protocols.size());
+  Result += "];\n} _OBJC_";
+  Result += prefix;
+  Result += "_PROTOCOLS_";
+  Result += ClassName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
+  "{\n\t0, ";
+  Result += utostr(Protocols.size());
+  Result += "\n";
+
+  Result += "\t,{&_OBJC_PROTOCOL_";
+  Result += Protocols[0]->getNameAsString();
+  Result += " \n";
+
+  for (unsigned i = 1; i != Protocols.size(); i++) {
+    Result += "\t ,&_OBJC_PROTOCOL_";
+    Result += Protocols[i]->getNameAsString();
+    Result += "\n";
+  }
+  Result += "\t }\n};\n";
+}
+
+void RewriteObjCFragileABI::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
+                                           std::string &Result) {
+  ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
+
+  // Explicitly declared @interface's are already synthesized.
+  if (CDecl->isImplicitInterfaceDecl()) {
+    // FIXME: Implementation of a class with no @interface (legacy) does not
+    // produce correct synthesis as yet.
+    RewriteObjCInternalStruct(CDecl, Result);
+  }
+
+  // Build _objc_ivar_list metadata for classes ivars if needed
+  unsigned NumIvars =
+      !IDecl->ivar_empty() ? IDecl->ivar_size() : CDecl->ivar_size();
+  if (NumIvars > 0) {
+    static bool objc_ivar = false;
+    if (!objc_ivar) {
+      /* struct _objc_ivar {
+       char *ivar_name;
+       char *ivar_type;
+       int ivar_offset;
+       };
+       */
+      Result += "\nstruct _objc_ivar {\n";
+      Result += "\tchar *ivar_name;\n";
+      Result += "\tchar *ivar_type;\n";
+      Result += "\tint ivar_offset;\n";
+      Result += "};\n";
+
+      objc_ivar = true;
+    }
+
+    /* struct {
+     int ivar_count;
+     struct _objc_ivar ivar_list[nIvars];
+     };
+     */
+    Result += "\nstatic struct {\n";
+    Result += "\tint ivar_count;\n";
+    Result += "\tstruct _objc_ivar ivar_list[";
+    Result += utostr(NumIvars);
+    Result += "];\n} _OBJC_INSTANCE_VARIABLES_";
+    Result += IDecl->getNameAsString();
+    Result += " __attribute__ ((used, section (\"__OBJC, __instance_vars\")))= "
+    "{\n\t";
+    Result += utostr(NumIvars);
+    Result += "\n";
+
+    ObjCInterfaceDecl::ivar_iterator IVI, IVE;
+    SmallVector<ObjCIvarDecl *, 8> IVars;
+    if (!IDecl->ivar_empty()) {
+      for (auto *IV : IDecl->ivars())
+        IVars.push_back(IV);
+      IVI = IDecl->ivar_begin();
+      IVE = IDecl->ivar_end();
+    } else {
+      IVI = CDecl->ivar_begin();
+      IVE = CDecl->ivar_end();
+    }
+    Result += "\t,{{\"";
+    Result += IVI->getNameAsString();
+    Result += "\", \"";
+    std::string TmpString, StrEncoding;
+    Context->getObjCEncodingForType(IVI->getType(), TmpString, *IVI);
+    QuoteDoublequotes(TmpString, StrEncoding);
+    Result += StrEncoding;
+    Result += "\", ";
+    RewriteIvarOffsetComputation(*IVI, Result);
+    Result += "}\n";
+    for (++IVI; IVI != IVE; ++IVI) {
+      Result += "\t  ,{\"";
+      Result += IVI->getNameAsString();
+      Result += "\", \"";
+      std::string TmpString, StrEncoding;
+      Context->getObjCEncodingForType(IVI->getType(), TmpString, *IVI);
+      QuoteDoublequotes(TmpString, StrEncoding);
+      Result += StrEncoding;
+      Result += "\", ";
+      RewriteIvarOffsetComputation(*IVI, Result);
+      Result += "}\n";
+    }
+
+    Result += "\t }\n};\n";
+  }
+
+  // Build _objc_method_list for class's instance methods if needed
+  SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
+
+  // If any of our property implementations have associated getters or
+  // setters, produce metadata for them as well.
+  for (const auto *Prop : IDecl->property_impls()) {
+    if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      continue;
+    if (!Prop->getPropertyIvarDecl())
+      continue;
+    ObjCPropertyDecl *PD = Prop->getPropertyDecl();
+    if (!PD)
+      continue;
+    if (ObjCMethodDecl *Getter = Prop->getGetterMethodDecl())
+      if (!Getter->isDefined())
+        InstanceMethods.push_back(Getter);
+    if (PD->isReadOnly())
+      continue;
+    if (ObjCMethodDecl *Setter = Prop->getSetterMethodDecl())
+      if (!Setter->isDefined())
+        InstanceMethods.push_back(Setter);
+  }
+  RewriteObjCMethodsMetaData(InstanceMethods.begin(), InstanceMethods.end(),
+                             true, "", IDecl->getName(), Result);
+
+  // Build _objc_method_list for class's class methods if needed
+  RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
+                             false, "", IDecl->getName(), Result);
+
+  // Protocols referenced in class declaration?
+  RewriteObjCProtocolListMetaData(CDecl->getReferencedProtocols(),
+                                  "CLASS", CDecl->getName(), Result);
+
+  // Declaration of class/meta-class metadata
+  /* struct _objc_class {
+   struct _objc_class *isa; // or const char *root_class_name when metadata
+   const char *super_class_name;
+   char *name;
+   long version;
+   long info;
+   long instance_size;
+   struct _objc_ivar_list *ivars;
+   struct _objc_method_list *methods;
+   struct objc_cache *cache;
+   struct objc_protocol_list *protocols;
+   const char *ivar_layout;
+   struct _objc_class_ext  *ext;
+   };
+   */
+  static bool objc_class = false;
+  if (!objc_class) {
+    Result += "\nstruct _objc_class {\n";
+    Result += "\tstruct _objc_class *isa;\n";
+    Result += "\tconst char *super_class_name;\n";
+    Result += "\tchar *name;\n";
+    Result += "\tlong version;\n";
+    Result += "\tlong info;\n";
+    Result += "\tlong instance_size;\n";
+    Result += "\tstruct _objc_ivar_list *ivars;\n";
+    Result += "\tstruct _objc_method_list *methods;\n";
+    Result += "\tstruct objc_cache *cache;\n";
+    Result += "\tstruct _objc_protocol_list *protocols;\n";
+    Result += "\tconst char *ivar_layout;\n";
+    Result += "\tstruct _objc_class_ext  *ext;\n";
+    Result += "};\n";
+    objc_class = true;
+  }
+
+  // Meta-class metadata generation.
+  ObjCInterfaceDecl *RootClass = nullptr;
+  ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
+  while (SuperClass) {
+    RootClass = SuperClass;
+    SuperClass = SuperClass->getSuperClass();
+  }
+  SuperClass = CDecl->getSuperClass();
+
+  Result += "\nstatic struct _objc_class _OBJC_METACLASS_";
+  Result += CDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__OBJC, __meta_class\")))= "
+  "{\n\t(struct _objc_class *)\"";
+  Result += (RootClass ? RootClass->getNameAsString() : CDecl->getNameAsString());
+  Result += "\"";
+
+  if (SuperClass) {
+    Result += ", \"";
+    Result += SuperClass->getNameAsString();
+    Result += "\", \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  else {
+    Result += ", 0, \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  // Set 'ivars' field for root class to 0. ObjC1 runtime does not use it.
+  // 'info' field is initialized to CLS_META(2) for metaclass
+  Result += ", 0,2, sizeof(struct _objc_class), 0";
+  if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
+    Result += "\n\t, (struct _objc_method_list *)&_OBJC_CLASS_METHODS_";
+    Result += IDecl->getNameAsString();
+    Result += "\n";
+  }
+  else
+    Result += ", 0\n";
+  if (CDecl->protocol_begin() != CDecl->protocol_end()) {
+    Result += "\t,0, (struct _objc_protocol_list *)&_OBJC_CLASS_PROTOCOLS_";
+    Result += CDecl->getNameAsString();
+    Result += ",0,0\n";
+  }
+  else
+    Result += "\t,0,0,0,0\n";
+  Result += "};\n";
+
+  // class metadata generation.
+  Result += "\nstatic struct _objc_class _OBJC_CLASS_";
+  Result += CDecl->getNameAsString();
+  Result += " __attribute__ ((used, section (\"__OBJC, __class\")))= "
+  "{\n\t&_OBJC_METACLASS_";
+  Result += CDecl->getNameAsString();
+  if (SuperClass) {
+    Result += ", \"";
+    Result += SuperClass->getNameAsString();
+    Result += "\", \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  else {
+    Result += ", 0, \"";
+    Result += CDecl->getNameAsString();
+    Result += "\"";
+  }
+  // 'info' field is initialized to CLS_CLASS(1) for class
+  Result += ", 0,1";
+  if (!ObjCSynthesizedStructs.count(CDecl))
+    Result += ",0";
+  else {
+    // class has size. Must synthesize its size.
+    Result += ",sizeof(struct ";
+    Result += CDecl->getNameAsString();
+    if (LangOpts.MicrosoftExt)
+      Result += "_IMPL";
+    Result += ")";
+  }
+  if (NumIvars > 0) {
+    Result += ", (struct _objc_ivar_list *)&_OBJC_INSTANCE_VARIABLES_";
+    Result += CDecl->getNameAsString();
+    Result += "\n\t";
+  }
+  else
+    Result += ",0";
+  if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
+    Result += ", (struct _objc_method_list *)&_OBJC_INSTANCE_METHODS_";
+    Result += CDecl->getNameAsString();
+    Result += ", 0\n\t";
+  }
+  else
+    Result += ",0,0";
+  if (CDecl->protocol_begin() != CDecl->protocol_end()) {
+    Result += ", (struct _objc_protocol_list*)&_OBJC_CLASS_PROTOCOLS_";
+    Result += CDecl->getNameAsString();
+    Result += ", 0,0\n";
+  }
+  else
+    Result += ",0,0,0\n";
+  Result += "};\n";
+}
+
+void RewriteObjCFragileABI::RewriteMetaDataIntoBuffer(std::string &Result) {
+  int ClsDefCount = ClassImplementation.size();
+  int CatDefCount = CategoryImplementation.size();
+
+  // For each implemented class, write out all its meta data.
+  for (int i = 0; i < ClsDefCount; i++)
+    RewriteObjCClassMetaData(ClassImplementation[i], Result);
+
+  // For each implemented category, write out all its meta data.
+  for (int i = 0; i < CatDefCount; i++)
+    RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
+
+  // Write objc_symtab metadata
+  /*
+   struct _objc_symtab
+   {
+   long sel_ref_cnt;
+   SEL *refs;
+   short cls_def_cnt;
+   short cat_def_cnt;
+   void *defs[cls_def_cnt + cat_def_cnt];
+   };
+   */
+
+  Result += "\nstruct _objc_symtab {\n";
+  Result += "\tlong sel_ref_cnt;\n";
+  Result += "\tSEL *refs;\n";
+  Result += "\tshort cls_def_cnt;\n";
+  Result += "\tshort cat_def_cnt;\n";
+  Result += "\tvoid *defs[" + utostr(ClsDefCount + CatDefCount)+ "];\n";
+  Result += "};\n\n";
+
+  Result += "static struct _objc_symtab "
+  "_OBJC_SYMBOLS __attribute__((used, section (\"__OBJC, __symbols\")))= {\n";
+  Result += "\t0, 0, " + utostr(ClsDefCount)
+  + ", " + utostr(CatDefCount) + "\n";
+  for (int i = 0; i < ClsDefCount; i++) {
+    Result += "\t,&_OBJC_CLASS_";
+    Result += ClassImplementation[i]->getNameAsString();
+    Result += "\n";
+  }
+
+  for (int i = 0; i < CatDefCount; i++) {
+    Result += "\t,&_OBJC_CATEGORY_";
+    Result += CategoryImplementation[i]->getClassInterface()->getNameAsString();
+    Result += "_";
+    Result += CategoryImplementation[i]->getNameAsString();
+    Result += "\n";
+  }
+
+  Result += "};\n\n";
+
+  // Write objc_module metadata
+
+  /*
+   struct _objc_module {
+   long version;
+   long size;
+   const char *name;
+   struct _objc_symtab *symtab;
+   }
+   */
+
+  Result += "\nstruct _objc_module {\n";
+  Result += "\tlong version;\n";
+  Result += "\tlong size;\n";
+  Result += "\tconst char *name;\n";
+  Result += "\tstruct _objc_symtab *symtab;\n";
+  Result += "};\n\n";
+  Result += "static struct _objc_module "
+  "_OBJC_MODULES __attribute__ ((used, section (\"__OBJC, __module_info\")))= {\n";
+  Result += "\t" + utostr(OBJC_ABI_VERSION) +
+  ", sizeof(struct _objc_module), \"\", &_OBJC_SYMBOLS\n";
+  Result += "};\n\n";
+
+  if (LangOpts.MicrosoftExt) {
+    if (ProtocolExprDecls.size()) {
+      Result += "#pragma section(\".objc_protocol$B\",long,read,write)\n";
+      Result += "#pragma data_seg(push, \".objc_protocol$B\")\n";
+      for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls) {
+        Result += "static struct _objc_protocol *_POINTER_OBJC_PROTOCOL_";
+        Result += ProtDecl->getNameAsString();
+        Result += " = &_OBJC_PROTOCOL_";
+        Result += ProtDecl->getNameAsString();
+        Result += ";\n";
+      }
+      Result += "#pragma data_seg(pop)\n\n";
+    }
+    Result += "#pragma section(\".objc_module_info$B\",long,read,write)\n";
+    Result += "#pragma data_seg(push, \".objc_module_info$B\")\n";
+    Result += "static struct _objc_module *_POINTER_OBJC_MODULES = ";
+    Result += "&_OBJC_MODULES;\n";
+    Result += "#pragma data_seg(pop)\n\n";
+  }
+}
+
+/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
+/// implementation.
+void RewriteObjCFragileABI::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
+                                              std::string &Result) {
+  ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
+  // Find category declaration for this implementation.
+  ObjCCategoryDecl *CDecl
+    = ClassDecl->FindCategoryDeclaration(IDecl->getIdentifier());
+
+  std::string FullCategoryName = ClassDecl->getNameAsString();
+  FullCategoryName += '_';
+  FullCategoryName += IDecl->getNameAsString();
+
+  // Build _objc_method_list for class's instance methods if needed
+  SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
+
+  // If any of our property implementations have associated getters or
+  // setters, produce metadata for them as well.
+  for (const auto *Prop : IDecl->property_impls()) {
+    if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
+      continue;
+    if (!Prop->getPropertyIvarDecl())
+      continue;
+    ObjCPropertyDecl *PD = Prop->getPropertyDecl();
+    if (!PD)
+      continue;
+    if (ObjCMethodDecl *Getter = Prop->getGetterMethodDecl())
+      InstanceMethods.push_back(Getter);
+    if (PD->isReadOnly())
+      continue;
+    if (ObjCMethodDecl *Setter = Prop->getSetterMethodDecl())
+      InstanceMethods.push_back(Setter);
+  }
+  RewriteObjCMethodsMetaData(InstanceMethods.begin(), InstanceMethods.end(),
+                             true, "CATEGORY_", FullCategoryName, Result);
+
+  // Build _objc_method_list for class's class methods if needed
+  RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
+                             false, "CATEGORY_", FullCategoryName, Result);
+
+  // Protocols referenced in class declaration?
+  // Null CDecl is case of a category implementation with no category interface
+  if (CDecl)
+    RewriteObjCProtocolListMetaData(CDecl->getReferencedProtocols(), "CATEGORY",
+                                    FullCategoryName, Result);
+  /* struct _objc_category {
+   char *category_name;
+   char *class_name;
+   struct _objc_method_list *instance_methods;
+   struct _objc_method_list *class_methods;
+   struct _objc_protocol_list *protocols;
+   // Objective-C 1.0 extensions
+   uint32_t size;     // sizeof (struct _objc_category)
+   struct _objc_property_list *instance_properties;  // category's own
+   // @property decl.
+   };
+   */
+
+  static bool objc_category = false;
+  if (!objc_category) {
+    Result += "\nstruct _objc_category {\n";
+    Result += "\tchar *category_name;\n";
+    Result += "\tchar *class_name;\n";
+    Result += "\tstruct _objc_method_list *instance_methods;\n";
+    Result += "\tstruct _objc_method_list *class_methods;\n";
+    Result += "\tstruct _objc_protocol_list *protocols;\n";
+    Result += "\tunsigned int size;\n";
+    Result += "\tstruct _objc_property_list *instance_properties;\n";
+    Result += "};\n";
+    objc_category = true;
+  }
+  Result += "\nstatic struct _objc_category _OBJC_CATEGORY_";
+  Result += FullCategoryName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __category\")))= {\n\t\"";
+  Result += IDecl->getNameAsString();
+  Result += "\"\n\t, \"";
+  Result += ClassDecl->getNameAsString();
+  Result += "\"\n";
+
+  if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
+    Result += "\t, (struct _objc_method_list *)"
+    "&_OBJC_CATEGORY_INSTANCE_METHODS_";
+    Result += FullCategoryName;
+    Result += "\n";
+  }
+  else
+    Result += "\t, 0\n";
+  if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
+    Result += "\t, (struct _objc_method_list *)"
+    "&_OBJC_CATEGORY_CLASS_METHODS_";
+    Result += FullCategoryName;
+    Result += "\n";
+  }
+  else
+    Result += "\t, 0\n";
+
+  if (CDecl && CDecl->protocol_begin() != CDecl->protocol_end()) {
+    Result += "\t, (struct _objc_protocol_list *)&_OBJC_CATEGORY_PROTOCOLS_";
+    Result += FullCategoryName;
+    Result += "\n";
+  }
+  else
+    Result += "\t, 0\n";
+  Result += "\t, sizeof(struct _objc_category), 0\n};\n";
+}
+
+// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
+/// class methods.
+template<typename MethodIterator>
+void RewriteObjCFragileABI::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
+                                             MethodIterator MethodEnd,
+                                             bool IsInstanceMethod,
+                                             StringRef prefix,
+                                             StringRef ClassName,
+                                             std::string &Result) {
+  if (MethodBegin == MethodEnd) return;
+
+  if (!objc_impl_method) {
+    /* struct _objc_method {
+     SEL _cmd;
+     char *method_types;
+     void *_imp;
+     }
+     */
+    Result += "\nstruct _objc_method {\n";
+    Result += "\tSEL _cmd;\n";
+    Result += "\tchar *method_types;\n";
+    Result += "\tvoid *_imp;\n";
+    Result += "};\n";
+
+    objc_impl_method = true;
+  }
+
+  // Build _objc_method_list for class's methods if needed
+
+  /* struct  {
+   struct _objc_method_list *next_method;
+   int method_count;
+   struct _objc_method method_list[];
+   }
+   */
+  unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
+  Result += "\nstatic struct {\n";
+  Result += "\tstruct _objc_method_list *next_method;\n";
+  Result += "\tint method_count;\n";
+  Result += "\tstruct _objc_method method_list[";
+  Result += utostr(NumMethods);
+  Result += "];\n} _OBJC_";
+  Result += prefix;
+  Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
+  Result += "_METHODS_";
+  Result += ClassName;
+  Result += " __attribute__ ((used, section (\"__OBJC, __";
+  Result += IsInstanceMethod ? "inst" : "cls";
+  Result += "_meth\")))= ";
+  Result += "{\n\t0, " + utostr(NumMethods) + "\n";
+
+  Result += "\t,{{(SEL)\"";
+  Result += (*MethodBegin)->getSelector().getAsString();
+  std::string MethodTypeString =
+    Context->getObjCEncodingForMethodDecl(*MethodBegin);
+  Result += "\", \"";
+  Result += MethodTypeString;
+  Result += "\", (void *)";
+  Result += MethodInternalNames[*MethodBegin];
+  Result += "}\n";
+  for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
+    Result += "\t  ,{(SEL)\"";
+    Result += (*MethodBegin)->getSelector().getAsString();
+    std::string MethodTypeString =
+      Context->getObjCEncodingForMethodDecl(*MethodBegin);
+    Result += "\", \"";
+    Result += MethodTypeString;
+    Result += "\", (void *)";
+    Result += MethodInternalNames[*MethodBegin];
+    Result += "}\n";
+  }
+  Result += "\t }\n};\n";
+}
+
+Stmt *RewriteObjCFragileABI::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) {
+  SourceRange OldRange = IV->getSourceRange();
+  Expr *BaseExpr = IV->getBase();
+
+  // Rewrite the base, but without actually doing replaces.
+  {
+    DisableReplaceStmtScope S(*this);
+    BaseExpr = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(BaseExpr));
+    IV->setBase(BaseExpr);
+  }
+
+  ObjCIvarDecl *D = IV->getDecl();
+
+  Expr *Replacement = IV;
+  if (CurMethodDef) {
+    if (BaseExpr->getType()->isObjCObjectPointerType()) {
+      const ObjCInterfaceType *iFaceDecl =
+      dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
+      assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
+      // lookup which class implements the instance variable.
+      ObjCInterfaceDecl *clsDeclared = nullptr;
+      iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
+                                                   clsDeclared);
+      assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
+
+      // Synthesize an explicit cast to gain access to the ivar.
+      std::string RecName =
+          std::string(clsDeclared->getIdentifier()->getName());
+      RecName += "_IMPL";
+      IdentifierInfo *II = &Context->Idents.get(RecName);
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+      CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, castT,
+                                                    CK_BitCast,
+                                                    IV->getBase());
+      // Don't forget the parens to enforce the proper binding.
+      ParenExpr *PE = new (Context) ParenExpr(OldRange.getBegin(),
+                                              OldRange.getEnd(),
+                                              castExpr);
+      if (IV->isFreeIvar() &&
+          declaresSameEntity(CurMethodDef->getClassInterface(),
+                             iFaceDecl->getDecl())) {
+        MemberExpr *ME = MemberExpr::CreateImplicit(
+            *Context, PE, true, D, D->getType(), VK_LValue, OK_Ordinary);
+        Replacement = ME;
+      } else {
+        IV->setBase(PE);
+      }
+    }
+  } else { // we are outside a method.
+    assert(!IV->isFreeIvar() && "Cannot have a free standing ivar outside a method");
+
+    // Explicit ivar refs need to have a cast inserted.
+    // FIXME: consider sharing some of this code with the code above.
+    if (BaseExpr->getType()->isObjCObjectPointerType()) {
+      const ObjCInterfaceType *iFaceDecl =
+      dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
+      // lookup which class implements the instance variable.
+      ObjCInterfaceDecl *clsDeclared = nullptr;
+      iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
+                                                   clsDeclared);
+      assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
+
+      // Synthesize an explicit cast to gain access to the ivar.
+      std::string RecName =
+          std::string(clsDeclared->getIdentifier()->getName());
+      RecName += "_IMPL";
+      IdentifierInfo *II = &Context->Idents.get(RecName);
+      RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
+                                          SourceLocation(), SourceLocation(),
+                                          II);
+      assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+      CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, castT,
+                                                    CK_BitCast,
+                                                    IV->getBase());
+      // Don't forget the parens to enforce the proper binding.
+      ParenExpr *PE = new (Context) ParenExpr(
+          IV->getBase()->getBeginLoc(), IV->getBase()->getEndLoc(), castExpr);
+      // Cannot delete IV->getBase(), since PE points to it.
+      // Replace the old base with the cast. This is important when doing
+      // embedded rewrites. For example, [newInv->_container addObject:0].
+      IV->setBase(PE);
+    }
+  }
+
+  ReplaceStmtWithRange(IV, Replacement, OldRange);
+  return Replacement;
+}
+
+#endif // CLANG_ENABLE_OBJC_REWRITER
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteTest.cpp b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteTest.cpp
new file mode 100644
index 0000000000..fa8232c8c3
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/RewriteTest.cpp
@@ -0,0 +1,38 @@
+//===--- RewriteTest.cpp - Rewriter playground ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a testbed.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Rewrite/Core/TokenRewriter.h"
+#include "clang/Rewrite/Frontend/Rewriters.h"
+#include "llvm/Support/raw_ostream.h"
+
+void clang::DoRewriteTest(Preprocessor &PP, raw_ostream *OS) {
+  SourceManager &SM = PP.getSourceManager();
+  const LangOptions &LangOpts = PP.getLangOpts();
+
+  TokenRewriter Rewriter(SM.getMainFileID(), SM, LangOpts);
+
+  // Throw <i> </i> tags around comments.
+  for (TokenRewriter::token_iterator I = Rewriter.token_begin(),
+       E = Rewriter.token_end(); I != E; ++I) {
+    if (I->isNot(tok::comment)) continue;
+
+    Rewriter.AddTokenBefore(I, "<i>");
+    Rewriter.AddTokenAfter(I, "</i>");
+  }
+
+
+  // Print out the output.
+  for (TokenRewriter::token_iterator I = Rewriter.token_begin(),
+       E = Rewriter.token_end(); I != E; ++I)
+    *OS << PP.getSpelling(*I);
+}
diff --git a/contrib/libs/clang14/lib/Frontend/Rewrite/ya.make b/contrib/libs/clang14/lib/Frontend/Rewrite/ya.make
new file mode 100644
index 0000000000..4b70265e96
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/Rewrite/ya.make
@@ -0,0 +1,42 @@
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
+LICENSE(Apache-2.0 WITH LLVM-exception)
+
+LICENSE_TEXTS(.yandex_meta/licenses.list.txt)
+
+PEERDIR(
+    contrib/libs/clang14
+    contrib/libs/clang14/include
+    contrib/libs/clang14/lib/AST
+    contrib/libs/clang14/lib/Basic
+    contrib/libs/clang14/lib/Edit
+    contrib/libs/clang14/lib/Frontend
+    contrib/libs/clang14/lib/Lex
+    contrib/libs/clang14/lib/Rewrite
+    contrib/libs/clang14/lib/Serialization
+    contrib/libs/llvm14
+    contrib/libs/llvm14/lib/Support
+)
+
+ADDINCL(
+    contrib/libs/clang14/lib/Frontend/Rewrite
+)
+
+NO_COMPILER_WARNINGS()
+
+NO_UTIL()
+
+SRCS(
+    FixItRewriter.cpp
+    FrontendActions.cpp
+    HTMLPrint.cpp
+    InclusionRewriter.cpp
+    RewriteMacros.cpp
+    RewriteModernObjC.cpp
+    RewriteObjC.cpp
+    RewriteTest.cpp
+)
+
+END()
diff --git a/contrib/libs/clang14/lib/Frontend/SerializedDiagnosticPrinter.cpp b/contrib/libs/clang14/lib/Frontend/SerializedDiagnosticPrinter.cpp
new file mode 100644
index 0000000000..fc8fce4b42
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/SerializedDiagnosticPrinter.cpp
@@ -0,0 +1,884 @@
+//===--- SerializedDiagnosticPrinter.cpp - Serializer for diagnostics -----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/SerializedDiagnosticPrinter.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/DiagnosticRenderer.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/SerializedDiagnosticReader.h"
+#include "clang/Frontend/SerializedDiagnostics.h"
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Lex/Lexer.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Bitstream/BitCodes.h"
+#include "llvm/Bitstream/BitstreamReader.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/raw_ostream.h"
+#include <utility>
+
+using namespace clang;
+using namespace clang::serialized_diags;
+
+namespace {
+
+class AbbreviationMap {
+  llvm::DenseMap<unsigned, unsigned> Abbrevs;
+public:
+  AbbreviationMap() {}
+
+  void set(unsigned recordID, unsigned abbrevID) {
+    assert(Abbrevs.find(recordID) == Abbrevs.end()
+           && "Abbreviation already set.");
+    Abbrevs[recordID] = abbrevID;
+  }
+
+  unsigned get(unsigned recordID) {
+    assert(Abbrevs.find(recordID) != Abbrevs.end() &&
+           "Abbreviation not set.");
+    return Abbrevs[recordID];
+  }
+};
+
+typedef SmallVector<uint64_t, 64> RecordData;
+typedef SmallVectorImpl<uint64_t> RecordDataImpl;
+typedef ArrayRef<uint64_t> RecordDataRef;
+
+class SDiagsWriter;
+
+class SDiagsRenderer : public DiagnosticNoteRenderer {
+  SDiagsWriter &Writer;
+public:
+  SDiagsRenderer(SDiagsWriter &Writer, const LangOptions &LangOpts,
+                 DiagnosticOptions *DiagOpts)
+    : DiagnosticNoteRenderer(LangOpts, DiagOpts), Writer(Writer) {}
+
+  ~SDiagsRenderer() override {}
+
+protected:
+  void emitDiagnosticMessage(FullSourceLoc Loc, PresumedLoc PLoc,
+                             DiagnosticsEngine::Level Level, StringRef Message,
+                             ArrayRef<CharSourceRange> Ranges,
+                             DiagOrStoredDiag D) override;
+
+  void emitDiagnosticLoc(FullSourceLoc Loc, PresumedLoc PLoc,
+                         DiagnosticsEngine::Level Level,
+                         ArrayRef<CharSourceRange> Ranges) override {}
+
+  void emitNote(FullSourceLoc Loc, StringRef Message) override;
+
+  void emitCodeContext(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
+                       SmallVectorImpl<CharSourceRange> &Ranges,
+                       ArrayRef<FixItHint> Hints) override;
+
+  void beginDiagnostic(DiagOrStoredDiag D,
+                       DiagnosticsEngine::Level Level) override;
+  void endDiagnostic(DiagOrStoredDiag D,
+                     DiagnosticsEngine::Level Level) override;
+};
+
+typedef llvm::DenseMap<unsigned, unsigned> AbbrevLookup;
+
+class SDiagsMerger : SerializedDiagnosticReader {
+  SDiagsWriter &Writer;
+  AbbrevLookup FileLookup;
+  AbbrevLookup CategoryLookup;
+  AbbrevLookup DiagFlagLookup;
+
+public:
+  SDiagsMerger(SDiagsWriter &Writer) : Writer(Writer) {}
+
+  std::error_code mergeRecordsFromFile(const char *File) {
+    return readDiagnostics(File);
+  }
+
+protected:
+  std::error_code visitStartOfDiagnostic() override;
+  std::error_code visitEndOfDiagnostic() override;
+  std::error_code visitCategoryRecord(unsigned ID, StringRef Name) override;
+  std::error_code visitDiagFlagRecord(unsigned ID, StringRef Name) override;
+  std::error_code visitDiagnosticRecord(
+      unsigned Severity, const serialized_diags::Location &Location,
+      unsigned Category, unsigned Flag, StringRef Message) override;
+  std::error_code visitFilenameRecord(unsigned ID, unsigned Size,
+                                      unsigned Timestamp,
+                                      StringRef Name) override;
+  std::error_code visitFixitRecord(const serialized_diags::Location &Start,
+                                   const serialized_diags::Location &End,
+                                   StringRef CodeToInsert) override;
+  std::error_code
+  visitSourceRangeRecord(const serialized_diags::Location &Start,
+                         const serialized_diags::Location &End) override;
+
+private:
+  std::error_code adjustSourceLocFilename(RecordData &Record,
+                                          unsigned int offset);
+
+  void adjustAbbrevID(RecordData &Record, AbbrevLookup &Lookup,
+                      unsigned NewAbbrev);
+
+  void writeRecordWithAbbrev(unsigned ID, RecordData &Record);
+
+  void writeRecordWithBlob(unsigned ID, RecordData &Record, StringRef Blob);
+};
+
+class SDiagsWriter : public DiagnosticConsumer {
+  friend class SDiagsRenderer;
+  friend class SDiagsMerger;
+
+  struct SharedState;
+
+  explicit SDiagsWriter(std::shared_ptr<SharedState> State)
+      : LangOpts(nullptr), OriginalInstance(false), MergeChildRecords(false),
+        State(std::move(State)) {}
+
+public:
+  SDiagsWriter(StringRef File, DiagnosticOptions *Diags, bool MergeChildRecords)
+      : LangOpts(nullptr), OriginalInstance(true),
+        MergeChildRecords(MergeChildRecords),
+        State(std::make_shared<SharedState>(File, Diags)) {
+    if (MergeChildRecords)
+      RemoveOldDiagnostics();
+    EmitPreamble();
+  }
+
+  ~SDiagsWriter() override {}
+
+  void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
+                        const Diagnostic &Info) override;
+
+  void BeginSourceFile(const LangOptions &LO, const Preprocessor *PP) override {
+    LangOpts = &LO;
+  }
+
+  void finish() override;
+
+private:
+  /// Build a DiagnosticsEngine to emit diagnostics about the diagnostics
+  DiagnosticsEngine *getMetaDiags();
+
+  /// Remove old copies of the serialized diagnostics. This is necessary
+  /// so that we can detect when subprocesses write diagnostics that we should
+  /// merge into our own.
+  void RemoveOldDiagnostics();
+
+  /// Emit the preamble for the serialized diagnostics.
+  void EmitPreamble();
+
+  /// Emit the BLOCKINFO block.
+  void EmitBlockInfoBlock();
+
+  /// Emit the META data block.
+  void EmitMetaBlock();
+
+  /// Start a DIAG block.
+  void EnterDiagBlock();
+
+  /// End a DIAG block.
+  void ExitDiagBlock();
+
+  /// Emit a DIAG record.
+  void EmitDiagnosticMessage(FullSourceLoc Loc, PresumedLoc PLoc,
+                             DiagnosticsEngine::Level Level, StringRef Message,
+                             DiagOrStoredDiag D);
+
+  /// Emit FIXIT and SOURCE_RANGE records for a diagnostic.
+  void EmitCodeContext(SmallVectorImpl<CharSourceRange> &Ranges,
+                       ArrayRef<FixItHint> Hints,
+                       const SourceManager &SM);
+
+  /// Emit a record for a CharSourceRange.
+  void EmitCharSourceRange(CharSourceRange R, const SourceManager &SM);
+
+  /// Emit the string information for the category.
+  unsigned getEmitCategory(unsigned category = 0);
+
+  /// Emit the string information for diagnostic flags.
+  unsigned getEmitDiagnosticFlag(DiagnosticsEngine::Level DiagLevel,
+                                 unsigned DiagID = 0);
+
+  unsigned getEmitDiagnosticFlag(StringRef DiagName);
+
+  /// Emit (lazily) the file string and retrieved the file identifier.
+  unsigned getEmitFile(const char *Filename);
+
+  /// Add SourceLocation information the specified record.
+  void AddLocToRecord(FullSourceLoc Loc, PresumedLoc PLoc,
+                      RecordDataImpl &Record, unsigned TokSize = 0);
+
+  /// Add SourceLocation information the specified record.
+  void AddLocToRecord(FullSourceLoc Loc, RecordDataImpl &Record,
+                      unsigned TokSize = 0) {
+    AddLocToRecord(Loc, Loc.hasManager() ? Loc.getPresumedLoc() : PresumedLoc(),
+                   Record, TokSize);
+  }
+
+  /// Add CharSourceRange information the specified record.
+  void AddCharSourceRangeToRecord(CharSourceRange R, RecordDataImpl &Record,
+                                  const SourceManager &SM);
+
+  /// Language options, which can differ from one clone of this client
+  /// to another.
+  const LangOptions *LangOpts;
+
+  /// Whether this is the original instance (rather than one of its
+  /// clones), responsible for writing the file at the end.
+  bool OriginalInstance;
+
+  /// Whether this instance should aggregate diagnostics that are
+  /// generated from child processes.
+  bool MergeChildRecords;
+
+  /// Whether we've started finishing and tearing down this instance.
+  bool IsFinishing = false;
+
+  /// State that is shared among the various clones of this diagnostic
+  /// consumer.
+  struct SharedState {
+    SharedState(StringRef File, DiagnosticOptions *Diags)
+        : DiagOpts(Diags), Stream(Buffer), OutputFile(File.str()),
+          EmittedAnyDiagBlocks(false) {}
+
+    /// Diagnostic options.
+    IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
+
+    /// The byte buffer for the serialized content.
+    SmallString<1024> Buffer;
+
+    /// The BitStreamWriter for the serialized diagnostics.
+    llvm::BitstreamWriter Stream;
+
+    /// The name of the diagnostics file.
+    std::string OutputFile;
+
+    /// The set of constructed record abbreviations.
+    AbbreviationMap Abbrevs;
+
+    /// A utility buffer for constructing record content.
+    RecordData Record;
+
+    /// A text buffer for rendering diagnostic text.
+    SmallString<256> diagBuf;
+
+    /// The collection of diagnostic categories used.
+    llvm::DenseSet<unsigned> Categories;
+
+    /// The collection of files used.
+    llvm::DenseMap<const char *, unsigned> Files;
+
+    typedef llvm::DenseMap<const void *, std::pair<unsigned, StringRef> >
+    DiagFlagsTy;
+
+    /// Map for uniquing strings.
+    DiagFlagsTy DiagFlags;
+
+    /// Whether we have already started emission of any DIAG blocks. Once
+    /// this becomes \c true, we never close a DIAG block until we know that we're
+    /// starting another one or we're done.
+    bool EmittedAnyDiagBlocks;
+
+    /// Engine for emitting diagnostics about the diagnostics.
+    std::unique_ptr<DiagnosticsEngine> MetaDiagnostics;
+  };
+
+  /// State shared among the various clones of this diagnostic consumer.
+  std::shared_ptr<SharedState> State;
+};
+} // end anonymous namespace
+
+namespace clang {
+namespace serialized_diags {
+std::unique_ptr<DiagnosticConsumer>
+create(StringRef OutputFile, DiagnosticOptions *Diags, bool MergeChildRecords) {
+  return std::make_unique<SDiagsWriter>(OutputFile, Diags, MergeChildRecords);
+}
+
+} // end namespace serialized_diags
+} // end namespace clang
+
+//===----------------------------------------------------------------------===//
+// Serialization methods.
+//===----------------------------------------------------------------------===//
+
+/// Emits a block ID in the BLOCKINFO block.
+static void EmitBlockID(unsigned ID, const char *Name,
+                        llvm::BitstreamWriter &Stream,
+                        RecordDataImpl &Record) {
+  Record.clear();
+  Record.push_back(ID);
+  Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, Record);
+
+  // Emit the block name if present.
+  if (!Name || Name[0] == 0)
+    return;
+
+  Record.clear();
+
+  while (*Name)
+    Record.push_back(*Name++);
+
+  Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Record);
+}
+
+/// Emits a record ID in the BLOCKINFO block.
+static void EmitRecordID(unsigned ID, const char *Name,
+                         llvm::BitstreamWriter &Stream,
+                         RecordDataImpl &Record){
+  Record.clear();
+  Record.push_back(ID);
+
+  while (*Name)
+    Record.push_back(*Name++);
+
+  Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Record);
+}
+
+void SDiagsWriter::AddLocToRecord(FullSourceLoc Loc, PresumedLoc PLoc,
+                                  RecordDataImpl &Record, unsigned TokSize) {
+  if (PLoc.isInvalid()) {
+    // Emit a "sentinel" location.
+    Record.push_back((unsigned)0); // File.
+    Record.push_back((unsigned)0); // Line.
+    Record.push_back((unsigned)0); // Column.
+    Record.push_back((unsigned)0); // Offset.
+    return;
+  }
+
+  Record.push_back(getEmitFile(PLoc.getFilename()));
+  Record.push_back(PLoc.getLine());
+  Record.push_back(PLoc.getColumn()+TokSize);
+  Record.push_back(Loc.getFileOffset());
+}
+
+void SDiagsWriter::AddCharSourceRangeToRecord(CharSourceRange Range,
+                                              RecordDataImpl &Record,
+                                              const SourceManager &SM) {
+  AddLocToRecord(FullSourceLoc(Range.getBegin(), SM), Record);
+  unsigned TokSize = 0;
+  if (Range.isTokenRange())
+    TokSize = Lexer::MeasureTokenLength(Range.getEnd(),
+                                        SM, *LangOpts);
+
+  AddLocToRecord(FullSourceLoc(Range.getEnd(), SM), Record, TokSize);
+}
+
+unsigned SDiagsWriter::getEmitFile(const char *FileName){
+  if (!FileName)
+    return 0;
+
+  unsigned &entry = State->Files[FileName];
+  if (entry)
+    return entry;
+
+  // Lazily generate the record for the file.
+  entry = State->Files.size();
+  StringRef Name(FileName);
+  RecordData::value_type Record[] = {RECORD_FILENAME, entry, 0 /* For legacy */,
+                                     0 /* For legacy */, Name.size()};
+  State->Stream.EmitRecordWithBlob(State->Abbrevs.get(RECORD_FILENAME), Record,
+                                   Name);
+
+  return entry;
+}
+
+void SDiagsWriter::EmitCharSourceRange(CharSourceRange R,
+                                       const SourceManager &SM) {
+  State->Record.clear();
+  State->Record.push_back(RECORD_SOURCE_RANGE);
+  AddCharSourceRangeToRecord(R, State->Record, SM);
+  State->Stream.EmitRecordWithAbbrev(State->Abbrevs.get(RECORD_SOURCE_RANGE),
+                                     State->Record);
+}
+
+/// Emits the preamble of the diagnostics file.
+void SDiagsWriter::EmitPreamble() {
+  // Emit the file header.
+  State->Stream.Emit((unsigned)'D', 8);
+  State->Stream.Emit((unsigned)'I', 8);
+  State->Stream.Emit((unsigned)'A', 8);
+  State->Stream.Emit((unsigned)'G', 8);
+
+  EmitBlockInfoBlock();
+  EmitMetaBlock();
+}
+
+static void AddSourceLocationAbbrev(llvm::BitCodeAbbrev &Abbrev) {
+  using namespace llvm;
+  Abbrev.Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 10)); // File ID.
+  Abbrev.Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Line.
+  Abbrev.Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Column.
+  Abbrev.Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Offset;
+}
+
+static void AddRangeLocationAbbrev(llvm::BitCodeAbbrev &Abbrev) {
+  AddSourceLocationAbbrev(Abbrev);
+  AddSourceLocationAbbrev(Abbrev);
+}
+
+void SDiagsWriter::EmitBlockInfoBlock() {
+  State->Stream.EnterBlockInfoBlock();
+
+  using namespace llvm;
+  llvm::BitstreamWriter &Stream = State->Stream;
+  RecordData &Record = State->Record;
+  AbbreviationMap &Abbrevs = State->Abbrevs;
+
+  // ==---------------------------------------------------------------------==//
+  // The subsequent records and Abbrevs are for the "Meta" block.
+  // ==---------------------------------------------------------------------==//
+
+  EmitBlockID(BLOCK_META, "Meta", Stream, Record);
+  EmitRecordID(RECORD_VERSION, "Version", Stream, Record);
+  auto Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_VERSION));
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
+  Abbrevs.set(RECORD_VERSION, Stream.EmitBlockInfoAbbrev(BLOCK_META, Abbrev));
+
+  // ==---------------------------------------------------------------------==//
+  // The subsequent records and Abbrevs are for the "Diagnostic" block.
+  // ==---------------------------------------------------------------------==//
+
+  EmitBlockID(BLOCK_DIAG, "Diag", Stream, Record);
+  EmitRecordID(RECORD_DIAG, "DiagInfo", Stream, Record);
+  EmitRecordID(RECORD_SOURCE_RANGE, "SrcRange", Stream, Record);
+  EmitRecordID(RECORD_CATEGORY, "CatName", Stream, Record);
+  EmitRecordID(RECORD_DIAG_FLAG, "DiagFlag", Stream, Record);
+  EmitRecordID(RECORD_FILENAME, "FileName", Stream, Record);
+  EmitRecordID(RECORD_FIXIT, "FixIt", Stream, Record);
+
+  // Emit abbreviation for RECORD_DIAG.
+  Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_DIAG));
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3));  // Diag level.
+  AddSourceLocationAbbrev(*Abbrev);
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 10)); // Category.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 10)); // Mapped Diag ID.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // Text size.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Diagnostc text.
+  Abbrevs.set(RECORD_DIAG, Stream.EmitBlockInfoAbbrev(BLOCK_DIAG, Abbrev));
+
+  // Emit abbreviation for RECORD_CATEGORY.
+  Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_CATEGORY));
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Category ID.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));  // Text size.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));      // Category text.
+  Abbrevs.set(RECORD_CATEGORY, Stream.EmitBlockInfoAbbrev(BLOCK_DIAG, Abbrev));
+
+  // Emit abbreviation for RECORD_SOURCE_RANGE.
+  Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_SOURCE_RANGE));
+  AddRangeLocationAbbrev(*Abbrev);
+  Abbrevs.set(RECORD_SOURCE_RANGE,
+              Stream.EmitBlockInfoAbbrev(BLOCK_DIAG, Abbrev));
+
+  // Emit the abbreviation for RECORD_DIAG_FLAG.
+  Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_DIAG_FLAG));
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 10)); // Mapped Diag ID.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Text size.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Flag name text.
+  Abbrevs.set(RECORD_DIAG_FLAG, Stream.EmitBlockInfoAbbrev(BLOCK_DIAG,
+                                                           Abbrev));
+
+  // Emit the abbreviation for RECORD_FILENAME.
+  Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_FILENAME));
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 10)); // Mapped file ID.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Size.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Modification time.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Text size.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name text.
+  Abbrevs.set(RECORD_FILENAME, Stream.EmitBlockInfoAbbrev(BLOCK_DIAG,
+                                                          Abbrev));
+
+  // Emit the abbreviation for RECORD_FIXIT.
+  Abbrev = std::make_shared<BitCodeAbbrev>();
+  Abbrev->Add(BitCodeAbbrevOp(RECORD_FIXIT));
+  AddRangeLocationAbbrev(*Abbrev);
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Text size.
+  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));      // FixIt text.
+  Abbrevs.set(RECORD_FIXIT, Stream.EmitBlockInfoAbbrev(BLOCK_DIAG,
+                                                       Abbrev));
+
+  Stream.ExitBlock();
+}
+
+void SDiagsWriter::EmitMetaBlock() {
+  llvm::BitstreamWriter &Stream = State->Stream;
+  AbbreviationMap &Abbrevs = State->Abbrevs;
+
+  Stream.EnterSubblock(BLOCK_META, 3);
+  RecordData::value_type Record[] = {RECORD_VERSION, VersionNumber};
+  Stream.EmitRecordWithAbbrev(Abbrevs.get(RECORD_VERSION), Record);
+  Stream.ExitBlock();
+}
+
+unsigned SDiagsWriter::getEmitCategory(unsigned int category) {
+  if (!State->Categories.insert(category).second)
+    return category;
+
+  // We use a local version of 'Record' so that we can be generating
+  // another record when we lazily generate one for the category entry.
+  StringRef catName = DiagnosticIDs::getCategoryNameFromID(category);
+  RecordData::value_type Record[] = {RECORD_CATEGORY, category, catName.size()};
+  State->Stream.EmitRecordWithBlob(State->Abbrevs.get(RECORD_CATEGORY), Record,
+                                   catName);
+
+  return category;
+}
+
+unsigned SDiagsWriter::getEmitDiagnosticFlag(DiagnosticsEngine::Level DiagLevel,
+                                             unsigned DiagID) {
+  if (DiagLevel == DiagnosticsEngine::Note)
+    return 0; // No flag for notes.
+
+  StringRef FlagName = DiagnosticIDs::getWarningOptionForDiag(DiagID);
+  return getEmitDiagnosticFlag(FlagName);
+}
+
+unsigned SDiagsWriter::getEmitDiagnosticFlag(StringRef FlagName) {
+  if (FlagName.empty())
+    return 0;
+
+  // Here we assume that FlagName points to static data whose pointer
+  // value is fixed.  This allows us to unique by diagnostic groups.
+  const void *data = FlagName.data();
+  std::pair<unsigned, StringRef> &entry = State->DiagFlags[data];
+  if (entry.first == 0) {
+    entry.first = State->DiagFlags.size();
+    entry.second = FlagName;
+
+    // Lazily emit the string in a separate record.
+    RecordData::value_type Record[] = {RECORD_DIAG_FLAG, entry.first,
+                                       FlagName.size()};
+    State->Stream.EmitRecordWithBlob(State->Abbrevs.get(RECORD_DIAG_FLAG),
+                                     Record, FlagName);
+  }
+
+  return entry.first;
+}
+
+void SDiagsWriter::HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
+                                    const Diagnostic &Info) {
+  assert(!IsFinishing &&
+         "Received a diagnostic after we've already started teardown.");
+  if (IsFinishing) {
+    SmallString<256> diagnostic;
+    Info.FormatDiagnostic(diagnostic);
+    getMetaDiags()->Report(
+        diag::warn_fe_serialized_diag_failure_during_finalisation)
+        << diagnostic;
+    return;
+  }
+
+  // Enter the block for a non-note diagnostic immediately, rather than waiting
+  // for beginDiagnostic, in case associated notes are emitted before we get
+  // there.
+  if (DiagLevel != DiagnosticsEngine::Note) {
+    if (State->EmittedAnyDiagBlocks)
+      ExitDiagBlock();
+
+    EnterDiagBlock();
+    State->EmittedAnyDiagBlocks = true;
+  }
+
+  // Compute the diagnostic text.
+  State->diagBuf.clear();
+  Info.FormatDiagnostic(State->diagBuf);
+
+  if (Info.getLocation().isInvalid()) {
+    // Special-case diagnostics with no location. We may not have entered a
+    // source file in this case, so we can't use the normal DiagnosticsRenderer
+    // machinery.
+
+    // Make sure we bracket all notes as "sub-diagnostics".  This matches
+    // the behavior in SDiagsRenderer::emitDiagnostic().
+    if (DiagLevel == DiagnosticsEngine::Note)
+      EnterDiagBlock();
+
+    EmitDiagnosticMessage(FullSourceLoc(), PresumedLoc(), DiagLevel,
+                          State->diagBuf, &Info);
+
+    if (DiagLevel == DiagnosticsEngine::Note)
+      ExitDiagBlock();
+
+    return;
+  }
+
+  assert(Info.hasSourceManager() && LangOpts &&
+         "Unexpected diagnostic with valid location outside of a source file");
+  SDiagsRenderer Renderer(*this, *LangOpts, &*State->DiagOpts);
+  Renderer.emitDiagnostic(
+      FullSourceLoc(Info.getLocation(), Info.getSourceManager()), DiagLevel,
+      State->diagBuf, Info.getRanges(), Info.getFixItHints(), &Info);
+}
+
+static serialized_diags::Level getStableLevel(DiagnosticsEngine::Level Level) {
+  switch (Level) {
+#define CASE(X) case DiagnosticsEngine::X: return serialized_diags::X;
+  CASE(Ignored)
+  CASE(Note)
+  CASE(Remark)
+  CASE(Warning)
+  CASE(Error)
+  CASE(Fatal)
+#undef CASE
+  }
+
+  llvm_unreachable("invalid diagnostic level");
+}
+
+void SDiagsWriter::EmitDiagnosticMessage(FullSourceLoc Loc, PresumedLoc PLoc,
+                                         DiagnosticsEngine::Level Level,
+                                         StringRef Message,
+                                         DiagOrStoredDiag D) {
+  llvm::BitstreamWriter &Stream = State->Stream;
+  RecordData &Record = State->Record;
+  AbbreviationMap &Abbrevs = State->Abbrevs;
+
+  // Emit the RECORD_DIAG record.
+  Record.clear();
+  Record.push_back(RECORD_DIAG);
+  Record.push_back(getStableLevel(Level));
+  AddLocToRecord(Loc, PLoc, Record);
+
+  if (const Diagnostic *Info = D.dyn_cast<const Diagnostic*>()) {
+    // Emit the category string lazily and get the category ID.
+    unsigned DiagID = DiagnosticIDs::getCategoryNumberForDiag(Info->getID());
+    Record.push_back(getEmitCategory(DiagID));
+    // Emit the diagnostic flag string lazily and get the mapped ID.
+    Record.push_back(getEmitDiagnosticFlag(Level, Info->getID()));
+  } else {
+    Record.push_back(getEmitCategory());
+    Record.push_back(getEmitDiagnosticFlag(Level));
+  }
+
+  Record.push_back(Message.size());
+  Stream.EmitRecordWithBlob(Abbrevs.get(RECORD_DIAG), Record, Message);
+}
+
+void SDiagsRenderer::emitDiagnosticMessage(
+    FullSourceLoc Loc, PresumedLoc PLoc, DiagnosticsEngine::Level Level,
+    StringRef Message, ArrayRef<clang::CharSourceRange> Ranges,
+    DiagOrStoredDiag D) {
+  Writer.EmitDiagnosticMessage(Loc, PLoc, Level, Message, D);
+}
+
+void SDiagsWriter::EnterDiagBlock() {
+  State->Stream.EnterSubblock(BLOCK_DIAG, 4);
+}
+
+void SDiagsWriter::ExitDiagBlock() {
+  State->Stream.ExitBlock();
+}
+
+void SDiagsRenderer::beginDiagnostic(DiagOrStoredDiag D,
+                                     DiagnosticsEngine::Level Level) {
+  if (Level == DiagnosticsEngine::Note)
+    Writer.EnterDiagBlock();
+}
+
+void SDiagsRenderer::endDiagnostic(DiagOrStoredDiag D,
+                                   DiagnosticsEngine::Level Level) {
+  // Only end note diagnostics here, because we can't be sure when we've seen
+  // the last note associated with a non-note diagnostic.
+  if (Level == DiagnosticsEngine::Note)
+    Writer.ExitDiagBlock();
+}
+
+void SDiagsWriter::EmitCodeContext(SmallVectorImpl<CharSourceRange> &Ranges,
+                                   ArrayRef<FixItHint> Hints,
+                                   const SourceManager &SM) {
+  llvm::BitstreamWriter &Stream = State->Stream;
+  RecordData &Record = State->Record;
+  AbbreviationMap &Abbrevs = State->Abbrevs;
+
+  // Emit Source Ranges.
+  for (ArrayRef<CharSourceRange>::iterator I = Ranges.begin(), E = Ranges.end();
+       I != E; ++I)
+    if (I->isValid())
+      EmitCharSourceRange(*I, SM);
+
+  // Emit FixIts.
+  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
+       I != E; ++I) {
+    const FixItHint &Fix = *I;
+    if (Fix.isNull())
+      continue;
+    Record.clear();
+    Record.push_back(RECORD_FIXIT);
+    AddCharSourceRangeToRecord(Fix.RemoveRange, Record, SM);
+    Record.push_back(Fix.CodeToInsert.size());
+    Stream.EmitRecordWithBlob(Abbrevs.get(RECORD_FIXIT), Record,
+                              Fix.CodeToInsert);
+  }
+}
+
+void SDiagsRenderer::emitCodeContext(FullSourceLoc Loc,
+                                     DiagnosticsEngine::Level Level,
+                                     SmallVectorImpl<CharSourceRange> &Ranges,
+                                     ArrayRef<FixItHint> Hints) {
+  Writer.EmitCodeContext(Ranges, Hints, Loc.getManager());
+}
+
+void SDiagsRenderer::emitNote(FullSourceLoc Loc, StringRef Message) {
+  Writer.EnterDiagBlock();
+  PresumedLoc PLoc = Loc.hasManager() ? Loc.getPresumedLoc() : PresumedLoc();
+  Writer.EmitDiagnosticMessage(Loc, PLoc, DiagnosticsEngine::Note, Message,
+                               DiagOrStoredDiag());
+  Writer.ExitDiagBlock();
+}
+
+DiagnosticsEngine *SDiagsWriter::getMetaDiags() {
+  // FIXME: It's slightly absurd to create a new diagnostics engine here, but
+  // the other options that are available today are worse:
+  //
+  // 1. Teach DiagnosticsConsumers to emit diagnostics to the engine they are a
+  //    part of. The DiagnosticsEngine would need to know not to send
+  //    diagnostics back to the consumer that failed. This would require us to
+  //    rework ChainedDiagnosticsConsumer and teach the engine about multiple
+  //    consumers, which is difficult today because most APIs interface with
+  //    consumers rather than the engine itself.
+  //
+  // 2. Pass a DiagnosticsEngine to SDiagsWriter on creation - this would need
+  //    to be distinct from the engine the writer was being added to and would
+  //    normally not be used.
+  if (!State->MetaDiagnostics) {
+    IntrusiveRefCntPtr<DiagnosticIDs> IDs(new DiagnosticIDs());
+    auto Client =
+        new TextDiagnosticPrinter(llvm::errs(), State->DiagOpts.get());
+    State->MetaDiagnostics = std::make_unique<DiagnosticsEngine>(
+        IDs, State->DiagOpts.get(), Client);
+  }
+  return State->MetaDiagnostics.get();
+}
+
+void SDiagsWriter::RemoveOldDiagnostics() {
+  if (!llvm::sys::fs::remove(State->OutputFile))
+    return;
+
+  getMetaDiags()->Report(diag::warn_fe_serialized_diag_merge_failure);
+  // Disable merging child records, as whatever is in this file may be
+  // misleading.
+  MergeChildRecords = false;
+}
+
+void SDiagsWriter::finish() {
+  assert(!IsFinishing);
+  IsFinishing = true;
+
+  // The original instance is responsible for writing the file.
+  if (!OriginalInstance)
+    return;
+
+  // Finish off any diagnostic we were in the process of emitting.
+  if (State->EmittedAnyDiagBlocks)
+    ExitDiagBlock();
+
+  if (MergeChildRecords) {
+    if (!State->EmittedAnyDiagBlocks)
+      // We have no diagnostics of our own, so we can just leave the child
+      // process' output alone
+      return;
+
+    if (llvm::sys::fs::exists(State->OutputFile))
+      if (SDiagsMerger(*this).mergeRecordsFromFile(State->OutputFile.c_str()))
+        getMetaDiags()->Report(diag::warn_fe_serialized_diag_merge_failure);
+  }
+
+  std::error_code EC;
+  auto OS = std::make_unique<llvm::raw_fd_ostream>(State->OutputFile.c_str(),
+                                                    EC, llvm::sys::fs::OF_None);
+  if (EC) {
+    getMetaDiags()->Report(diag::warn_fe_serialized_diag_failure)
+        << State->OutputFile << EC.message();
+    OS->clear_error();
+    return;
+  }
+
+  // Write the generated bitstream to "Out".
+  OS->write((char *)&State->Buffer.front(), State->Buffer.size());
+  OS->flush();
+
+  assert(!OS->has_error());
+  if (OS->has_error()) {
+    getMetaDiags()->Report(diag::warn_fe_serialized_diag_failure)
+        << State->OutputFile << OS->error().message();
+    OS->clear_error();
+  }
+}
+
+std::error_code SDiagsMerger::visitStartOfDiagnostic() {
+  Writer.EnterDiagBlock();
+  return std::error_code();
+}
+
+std::error_code SDiagsMerger::visitEndOfDiagnostic() {
+  Writer.ExitDiagBlock();
+  return std::error_code();
+}
+
+std::error_code
+SDiagsMerger::visitSourceRangeRecord(const serialized_diags::Location &Start,
+                                     const serialized_diags::Location &End) {
+  RecordData::value_type Record[] = {
+      RECORD_SOURCE_RANGE, FileLookup[Start.FileID], Start.Line, Start.Col,
+      Start.Offset, FileLookup[End.FileID], End.Line, End.Col, End.Offset};
+  Writer.State->Stream.EmitRecordWithAbbrev(
+      Writer.State->Abbrevs.get(RECORD_SOURCE_RANGE), Record);
+  return std::error_code();
+}
+
+std::error_code SDiagsMerger::visitDiagnosticRecord(
+    unsigned Severity, const serialized_diags::Location &Location,
+    unsigned Category, unsigned Flag, StringRef Message) {
+  RecordData::value_type Record[] = {
+      RECORD_DIAG, Severity, FileLookup[Location.FileID], Location.Line,
+      Location.Col, Location.Offset, CategoryLookup[Category],
+      Flag ? DiagFlagLookup[Flag] : 0, Message.size()};
+
+  Writer.State->Stream.EmitRecordWithBlob(
+      Writer.State->Abbrevs.get(RECORD_DIAG), Record, Message);
+  return std::error_code();
+}
+
+std::error_code
+SDiagsMerger::visitFixitRecord(const serialized_diags::Location &Start,
+                               const serialized_diags::Location &End,
+                               StringRef Text) {
+  RecordData::value_type Record[] = {RECORD_FIXIT, FileLookup[Start.FileID],
+                                     Start.Line, Start.Col, Start.Offset,
+                                     FileLookup[End.FileID], End.Line, End.Col,
+                                     End.Offset, Text.size()};
+
+  Writer.State->Stream.EmitRecordWithBlob(
+      Writer.State->Abbrevs.get(RECORD_FIXIT), Record, Text);
+  return std::error_code();
+}
+
+std::error_code SDiagsMerger::visitFilenameRecord(unsigned ID, unsigned Size,
+                                                  unsigned Timestamp,
+                                                  StringRef Name) {
+  FileLookup[ID] = Writer.getEmitFile(Name.str().c_str());
+  return std::error_code();
+}
+
+std::error_code SDiagsMerger::visitCategoryRecord(unsigned ID, StringRef Name) {
+  CategoryLookup[ID] = Writer.getEmitCategory(ID);
+  return std::error_code();
+}
+
+std::error_code SDiagsMerger::visitDiagFlagRecord(unsigned ID, StringRef Name) {
+  DiagFlagLookup[ID] = Writer.getEmitDiagnosticFlag(Name);
+  return std::error_code();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/SerializedDiagnosticReader.cpp b/contrib/libs/clang14/lib/Frontend/SerializedDiagnosticReader.cpp
new file mode 100644
index 0000000000..eca6f5ee18
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/SerializedDiagnosticReader.cpp
@@ -0,0 +1,371 @@
+//===- SerializedDiagnosticReader.cpp - Reads diagnostics -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/SerializedDiagnosticReader.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/FileSystemOptions.h"
+#include "clang/Frontend/SerializedDiagnostics.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Bitstream/BitCodes.h"
+#include "llvm/Bitstream/BitstreamReader.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/ManagedStatic.h"
+#include <cstdint>
+#include <system_error>
+
+using namespace clang;
+using namespace serialized_diags;
+
+std::error_code SerializedDiagnosticReader::readDiagnostics(StringRef File) {
+  // Open the diagnostics file.
+  FileSystemOptions FO;
+  FileManager FileMgr(FO);
+
+  auto Buffer = FileMgr.getBufferForFile(File);
+  if (!Buffer)
+    return SDError::CouldNotLoad;
+
+  llvm::BitstreamCursor Stream(**Buffer);
+  Optional<llvm::BitstreamBlockInfo> BlockInfo;
+
+  if (Stream.AtEndOfStream())
+    return SDError::InvalidSignature;
+
+  // Sniff for the signature.
+  for (unsigned char C : {'D', 'I', 'A', 'G'}) {
+    if (Expected<llvm::SimpleBitstreamCursor::word_t> Res = Stream.Read(8)) {
+      if (Res.get() == C)
+        continue;
+    } else {
+      // FIXME this drops the error on the floor.
+      consumeError(Res.takeError());
+    }
+    return SDError::InvalidSignature;
+  }
+
+  // Read the top level blocks.
+  while (!Stream.AtEndOfStream()) {
+    if (Expected<unsigned> Res = Stream.ReadCode()) {
+      if (Res.get() != llvm::bitc::ENTER_SUBBLOCK)
+        return SDError::InvalidDiagnostics;
+    } else {
+      // FIXME this drops the error on the floor.
+      consumeError(Res.takeError());
+      return SDError::InvalidDiagnostics;
+    }
+
+    std::error_code EC;
+    Expected<unsigned> MaybeSubBlockID = Stream.ReadSubBlockID();
+    if (!MaybeSubBlockID) {
+      // FIXME this drops the error on the floor.
+      consumeError(MaybeSubBlockID.takeError());
+      return SDError::InvalidDiagnostics;
+    }
+
+    switch (MaybeSubBlockID.get()) {
+    case llvm::bitc::BLOCKINFO_BLOCK_ID: {
+      Expected<Optional<llvm::BitstreamBlockInfo>> MaybeBlockInfo =
+          Stream.ReadBlockInfoBlock();
+      if (!MaybeBlockInfo) {
+        // FIXME this drops the error on the floor.
+        consumeError(MaybeBlockInfo.takeError());
+        return SDError::InvalidDiagnostics;
+      }
+      BlockInfo = std::move(MaybeBlockInfo.get());
+    }
+      if (!BlockInfo)
+        return SDError::MalformedBlockInfoBlock;
+      Stream.setBlockInfo(&*BlockInfo);
+      continue;
+    case BLOCK_META:
+      if ((EC = readMetaBlock(Stream)))
+        return EC;
+      continue;
+    case BLOCK_DIAG:
+      if ((EC = readDiagnosticBlock(Stream)))
+        return EC;
+      continue;
+    default:
+      if (llvm::Error Err = Stream.SkipBlock()) {
+        // FIXME this drops the error on the floor.
+        consumeError(std::move(Err));
+        return SDError::MalformedTopLevelBlock;
+      }
+      continue;
+    }
+  }
+  return {};
+}
+
+enum class SerializedDiagnosticReader::Cursor {
+  Record = 1,
+  BlockEnd,
+  BlockBegin
+};
+
+llvm::ErrorOr<SerializedDiagnosticReader::Cursor>
+SerializedDiagnosticReader::skipUntilRecordOrBlock(
+    llvm::BitstreamCursor &Stream, unsigned &BlockOrRecordID) {
+  BlockOrRecordID = 0;
+
+  while (!Stream.AtEndOfStream()) {
+    unsigned Code;
+    if (Expected<unsigned> Res = Stream.ReadCode())
+      Code = Res.get();
+    else
+      return llvm::errorToErrorCode(Res.takeError());
+
+    if (Code >= static_cast<unsigned>(llvm::bitc::FIRST_APPLICATION_ABBREV)) {
+      // We found a record.
+      BlockOrRecordID = Code;
+      return Cursor::Record;
+    }
+    switch (static_cast<llvm::bitc::FixedAbbrevIDs>(Code)) {
+    case llvm::bitc::ENTER_SUBBLOCK:
+      if (Expected<unsigned> Res = Stream.ReadSubBlockID())
+        BlockOrRecordID = Res.get();
+      else
+        return llvm::errorToErrorCode(Res.takeError());
+      return Cursor::BlockBegin;
+
+    case llvm::bitc::END_BLOCK:
+      if (Stream.ReadBlockEnd())
+        return SDError::InvalidDiagnostics;
+      return Cursor::BlockEnd;
+
+    case llvm::bitc::DEFINE_ABBREV:
+      if (llvm::Error Err = Stream.ReadAbbrevRecord())
+        return llvm::errorToErrorCode(std::move(Err));
+      continue;
+
+    case llvm::bitc::UNABBREV_RECORD:
+      return SDError::UnsupportedConstruct;
+
+    case llvm::bitc::FIRST_APPLICATION_ABBREV:
+      llvm_unreachable("Unexpected abbrev id.");
+    }
+  }
+
+  return SDError::InvalidDiagnostics;
+}
+
+std::error_code
+SerializedDiagnosticReader::readMetaBlock(llvm::BitstreamCursor &Stream) {
+  if (llvm::Error Err =
+          Stream.EnterSubBlock(clang::serialized_diags::BLOCK_META)) {
+    // FIXME this drops the error on the floor.
+    consumeError(std::move(Err));
+    return SDError::MalformedMetadataBlock;
+  }
+
+  bool VersionChecked = false;
+
+  while (true) {
+    unsigned BlockOrCode = 0;
+    llvm::ErrorOr<Cursor> Res = skipUntilRecordOrBlock(Stream, BlockOrCode);
+    if (!Res)
+      Res.getError();
+
+    switch (Res.get()) {
+    case Cursor::Record:
+      break;
+    case Cursor::BlockBegin:
+      if (llvm::Error Err = Stream.SkipBlock()) {
+        // FIXME this drops the error on the floor.
+        consumeError(std::move(Err));
+        return SDError::MalformedMetadataBlock;
+      }
+      LLVM_FALLTHROUGH;
+    case Cursor::BlockEnd:
+      if (!VersionChecked)
+        return SDError::MissingVersion;
+      return {};
+    }
+
+    SmallVector<uint64_t, 1> Record;
+    Expected<unsigned> MaybeRecordID = Stream.readRecord(BlockOrCode, Record);
+    if (!MaybeRecordID)
+      return errorToErrorCode(MaybeRecordID.takeError());
+    unsigned RecordID = MaybeRecordID.get();
+
+    if (RecordID == RECORD_VERSION) {
+      if (Record.size() < 1)
+        return SDError::MissingVersion;
+      if (Record[0] > VersionNumber)
+        return SDError::VersionMismatch;
+      VersionChecked = true;
+    }
+  }
+}
+
+std::error_code
+SerializedDiagnosticReader::readDiagnosticBlock(llvm::BitstreamCursor &Stream) {
+  if (llvm::Error Err =
+          Stream.EnterSubBlock(clang::serialized_diags::BLOCK_DIAG)) {
+    // FIXME this drops the error on the floor.
+    consumeError(std::move(Err));
+    return SDError::MalformedDiagnosticBlock;
+  }
+
+  std::error_code EC;
+  if ((EC = visitStartOfDiagnostic()))
+    return EC;
+
+  SmallVector<uint64_t, 16> Record;
+  while (true) {
+    unsigned BlockOrCode = 0;
+    llvm::ErrorOr<Cursor> Res = skipUntilRecordOrBlock(Stream, BlockOrCode);
+    if (!Res)
+      Res.getError();
+
+    switch (Res.get()) {
+    case Cursor::BlockBegin:
+      // The only blocks we care about are subdiagnostics.
+      if (BlockOrCode == serialized_diags::BLOCK_DIAG) {
+        if ((EC = readDiagnosticBlock(Stream)))
+          return EC;
+      } else if (llvm::Error Err = Stream.SkipBlock()) {
+        // FIXME this drops the error on the floor.
+        consumeError(std::move(Err));
+        return SDError::MalformedSubBlock;
+      }
+      continue;
+    case Cursor::BlockEnd:
+      if ((EC = visitEndOfDiagnostic()))
+        return EC;
+      return {};
+    case Cursor::Record:
+      break;
+    }
+
+    // Read the record.
+    Record.clear();
+    StringRef Blob;
+    Expected<unsigned> MaybeRecID =
+        Stream.readRecord(BlockOrCode, Record, &Blob);
+    if (!MaybeRecID)
+      return errorToErrorCode(MaybeRecID.takeError());
+    unsigned RecID = MaybeRecID.get();
+
+    if (RecID < serialized_diags::RECORD_FIRST ||
+        RecID > serialized_diags::RECORD_LAST)
+      continue;
+
+    switch ((RecordIDs)RecID) {
+    case RECORD_CATEGORY:
+      // A category has ID and name size.
+      if (Record.size() != 2)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitCategoryRecord(Record[0], Blob)))
+        return EC;
+      continue;
+    case RECORD_DIAG:
+      // A diagnostic has severity, location (4), category, flag, and message
+      // size.
+      if (Record.size() != 8)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitDiagnosticRecord(
+               Record[0], Location(Record[1], Record[2], Record[3], Record[4]),
+               Record[5], Record[6], Blob)))
+        return EC;
+      continue;
+    case RECORD_DIAG_FLAG:
+      // A diagnostic flag has ID and name size.
+      if (Record.size() != 2)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitDiagFlagRecord(Record[0], Blob)))
+        return EC;
+      continue;
+    case RECORD_FILENAME:
+      // A filename has ID, size, timestamp, and name size. The size and
+      // timestamp are legacy fields that are always zero these days.
+      if (Record.size() != 4)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitFilenameRecord(Record[0], Record[1], Record[2], Blob)))
+        return EC;
+      continue;
+    case RECORD_FIXIT:
+      // A fixit has two locations (4 each) and message size.
+      if (Record.size() != 9)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitFixitRecord(
+               Location(Record[0], Record[1], Record[2], Record[3]),
+               Location(Record[4], Record[5], Record[6], Record[7]), Blob)))
+        return EC;
+      continue;
+    case RECORD_SOURCE_RANGE:
+      // A source range is two locations (4 each).
+      if (Record.size() != 8)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitSourceRangeRecord(
+               Location(Record[0], Record[1], Record[2], Record[3]),
+               Location(Record[4], Record[5], Record[6], Record[7]))))
+        return EC;
+      continue;
+    case RECORD_VERSION:
+      // A version is just a number.
+      if (Record.size() != 1)
+        return SDError::MalformedDiagnosticRecord;
+      if ((EC = visitVersionRecord(Record[0])))
+        return EC;
+      continue;
+    }
+  }
+}
+
+namespace {
+
+class SDErrorCategoryType final : public std::error_category {
+  const char *name() const noexcept override {
+    return "clang.serialized_diags";
+  }
+
+  std::string message(int IE) const override {
+    auto E = static_cast<SDError>(IE);
+    switch (E) {
+    case SDError::CouldNotLoad:
+      return "Failed to open diagnostics file";
+    case SDError::InvalidSignature:
+      return "Invalid diagnostics signature";
+    case SDError::InvalidDiagnostics:
+      return "Parse error reading diagnostics";
+    case SDError::MalformedTopLevelBlock:
+      return "Malformed block at top-level of diagnostics";
+    case SDError::MalformedSubBlock:
+      return "Malformed sub-block in a diagnostic";
+    case SDError::MalformedBlockInfoBlock:
+      return "Malformed BlockInfo block";
+    case SDError::MalformedMetadataBlock:
+      return "Malformed Metadata block";
+    case SDError::MalformedDiagnosticBlock:
+      return "Malformed Diagnostic block";
+    case SDError::MalformedDiagnosticRecord:
+      return "Malformed Diagnostic record";
+    case SDError::MissingVersion:
+      return "No version provided in diagnostics";
+    case SDError::VersionMismatch:
+      return "Unsupported diagnostics version";
+    case SDError::UnsupportedConstruct:
+      return "Bitcode constructs that are not supported in diagnostics appear";
+    case SDError::HandlerFailed:
+      return "Generic error occurred while handling a record";
+    }
+    llvm_unreachable("Unknown error type!");
+  }
+};
+
+} // namespace
+
+static llvm::ManagedStatic<SDErrorCategoryType> ErrorCategory;
+const std::error_category &clang::serialized_diags::SDErrorCategory() {
+  return *ErrorCategory;
+}
diff --git a/contrib/libs/clang14/lib/Frontend/TestModuleFileExtension.cpp b/contrib/libs/clang14/lib/Frontend/TestModuleFileExtension.cpp
new file mode 100644
index 0000000000..2d5145d0c5
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/TestModuleFileExtension.cpp
@@ -0,0 +1,137 @@
+//===-- TestModuleFileExtension.cpp - Module Extension Tester -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "TestModuleFileExtension.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Serialization/ASTReader.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cstdio>
+using namespace clang;
+using namespace clang::serialization;
+
+char TestModuleFileExtension::ID = 0;
+
+TestModuleFileExtension::Writer::~Writer() { }
+
+void TestModuleFileExtension::Writer::writeExtensionContents(
+       Sema &SemaRef,
+       llvm::BitstreamWriter &Stream) {
+  using namespace llvm;
+
+  // Write an abbreviation for this record.
+  auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
+  Abv->Add(BitCodeAbbrevOp(FIRST_EXTENSION_RECORD_ID));
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of characters
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));   // message
+  auto Abbrev = Stream.EmitAbbrev(std::move(Abv));
+
+  // Write a message into the extension block.
+  SmallString<64> Message;
+  {
+    auto Ext = static_cast<TestModuleFileExtension *>(getExtension());
+    raw_svector_ostream OS(Message);
+    OS << "Hello from " << Ext->BlockName << " v" << Ext->MajorVersion << "."
+       << Ext->MinorVersion;
+  }
+  uint64_t Record[] = {FIRST_EXTENSION_RECORD_ID, Message.size()};
+  Stream.EmitRecordWithBlob(Abbrev, Record, Message);
+}
+
+TestModuleFileExtension::Reader::Reader(ModuleFileExtension *Ext,
+                                        const llvm::BitstreamCursor &InStream)
+  : ModuleFileExtensionReader(Ext), Stream(InStream)
+{
+  // Read the extension block.
+  SmallVector<uint64_t, 4> Record;
+  while (true) {
+    llvm::Expected<llvm::BitstreamEntry> MaybeEntry =
+        Stream.advanceSkippingSubblocks();
+    if (!MaybeEntry)
+      (void)MaybeEntry.takeError();
+    llvm::BitstreamEntry Entry = MaybeEntry.get();
+
+    switch (Entry.Kind) {
+    case llvm::BitstreamEntry::SubBlock:
+    case llvm::BitstreamEntry::EndBlock:
+    case llvm::BitstreamEntry::Error:
+      return;
+
+    case llvm::BitstreamEntry::Record:
+      break;
+    }
+
+    Record.clear();
+    StringRef Blob;
+    Expected<unsigned> MaybeRecCode =
+        Stream.readRecord(Entry.ID, Record, &Blob);
+    if (!MaybeRecCode)
+      fprintf(stderr, "Failed reading rec code: %s\n",
+              toString(MaybeRecCode.takeError()).c_str());
+    switch (MaybeRecCode.get()) {
+    case FIRST_EXTENSION_RECORD_ID: {
+      StringRef Message = Blob.substr(0, Record[0]);
+      fprintf(stderr, "Read extension block message: %s\n",
+              Message.str().c_str());
+      break;
+    }
+    }
+  }
+}
+
+TestModuleFileExtension::Reader::~Reader() { }
+
+TestModuleFileExtension::~TestModuleFileExtension() { }
+
+ModuleFileExtensionMetadata
+TestModuleFileExtension::getExtensionMetadata() const {
+  return { BlockName, MajorVersion, MinorVersion, UserInfo };
+}
+
+void TestModuleFileExtension::hashExtension(
+    ExtensionHashBuilder &HBuilder) const {
+  if (Hashed) {
+    HBuilder.add(BlockName);
+    HBuilder.add(MajorVersion);
+    HBuilder.add(MinorVersion);
+    HBuilder.add(UserInfo);
+  }
+}
+
+std::unique_ptr<ModuleFileExtensionWriter>
+TestModuleFileExtension::createExtensionWriter(ASTWriter &) {
+  return std::unique_ptr<ModuleFileExtensionWriter>(new Writer(this));
+}
+
+std::unique_ptr<ModuleFileExtensionReader>
+TestModuleFileExtension::createExtensionReader(
+  const ModuleFileExtensionMetadata &Metadata,
+  ASTReader &Reader, serialization::ModuleFile &Mod,
+  const llvm::BitstreamCursor &Stream)
+{
+  assert(Metadata.BlockName == BlockName && "Wrong block name");
+  if (std::make_pair(Metadata.MajorVersion, Metadata.MinorVersion) !=
+        std::make_pair(MajorVersion, MinorVersion)) {
+    Reader.getDiags().Report(Mod.ImportLoc,
+                             diag::err_test_module_file_extension_version)
+      << BlockName << Metadata.MajorVersion << Metadata.MinorVersion
+      << MajorVersion << MinorVersion;
+    return nullptr;
+  }
+
+  return std::unique_ptr<ModuleFileExtensionReader>(
+                                                    new TestModuleFileExtension::Reader(this, Stream));
+}
+
+std::string TestModuleFileExtension::str() const {
+  std::string Buffer;
+  llvm::raw_string_ostream OS(Buffer);
+  OS << BlockName << ":" << MajorVersion << ":" << MinorVersion << ":" << Hashed
+     << ":" << UserInfo;
+  return Buffer;
+}
diff --git a/contrib/libs/clang14/lib/Frontend/TestModuleFileExtension.h b/contrib/libs/clang14/lib/Frontend/TestModuleFileExtension.h
new file mode 100644
index 0000000000..e22c87ed2d
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/TestModuleFileExtension.h
@@ -0,0 +1,73 @@
+//===-- TestModuleFileExtension.h - Module Extension Tester -----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_FRONTEND_TESTMODULEFILEEXTENSION_H
+#define LLVM_CLANG_FRONTEND_TESTMODULEFILEEXTENSION_H
+
+#include "clang/Serialization/ModuleFileExtension.h"
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Bitstream/BitstreamReader.h"
+#include <string>
+
+namespace clang {
+
+/// A module file extension used for testing purposes.
+class TestModuleFileExtension
+    : public llvm::RTTIExtends<TestModuleFileExtension, ModuleFileExtension> {
+  std::string BlockName;
+  unsigned MajorVersion;
+  unsigned MinorVersion;
+  bool Hashed;
+  std::string UserInfo;
+
+  class Writer : public ModuleFileExtensionWriter {
+  public:
+    Writer(ModuleFileExtension *Ext) : ModuleFileExtensionWriter(Ext) { }
+    ~Writer() override;
+
+    void writeExtensionContents(Sema &SemaRef,
+                                llvm::BitstreamWriter &Stream) override;
+  };
+
+  class Reader : public ModuleFileExtensionReader {
+    llvm::BitstreamCursor Stream;
+
+  public:
+    ~Reader() override;
+
+    Reader(ModuleFileExtension *Ext, const llvm::BitstreamCursor &InStream);
+  };
+
+public:
+  static char ID;
+
+  TestModuleFileExtension(StringRef BlockName, unsigned MajorVersion,
+                          unsigned MinorVersion, bool Hashed,
+                          StringRef UserInfo)
+      : BlockName(BlockName), MajorVersion(MajorVersion),
+        MinorVersion(MinorVersion), Hashed(Hashed), UserInfo(UserInfo) {}
+  ~TestModuleFileExtension() override;
+
+  ModuleFileExtensionMetadata getExtensionMetadata() const override;
+
+  void hashExtension(ExtensionHashBuilder &HBuilder) const override;
+
+  std::unique_ptr<ModuleFileExtensionWriter>
+  createExtensionWriter(ASTWriter &Writer) override;
+
+  std::unique_ptr<ModuleFileExtensionReader>
+  createExtensionReader(const ModuleFileExtensionMetadata &Metadata,
+                        ASTReader &Reader, serialization::ModuleFile &Mod,
+                        const llvm::BitstreamCursor &Stream) override;
+
+  std::string str() const;
+};
+
+} // end namespace clang
+
+#endif // LLVM_CLANG_FRONTEND_TESTMODULEFILEEXTENSION_H
diff --git a/contrib/libs/clang14/lib/Frontend/TextDiagnostic.cpp b/contrib/libs/clang14/lib/Frontend/TextDiagnostic.cpp
new file mode 100644
index 0000000000..1c4a76e689
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/TextDiagnostic.cpp
@@ -0,0 +1,1355 @@
+//===--- TextDiagnostic.cpp - Text Diagnostic Pretty-Printing -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/TextDiagnostic.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Lex/Lexer.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/ConvertUTF.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Locale.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+
+using namespace clang;
+
+static const enum raw_ostream::Colors noteColor =
+  raw_ostream::BLACK;
+static const enum raw_ostream::Colors remarkColor =
+  raw_ostream::BLUE;
+static const enum raw_ostream::Colors fixitColor =
+  raw_ostream::GREEN;
+static const enum raw_ostream::Colors caretColor =
+  raw_ostream::GREEN;
+static const enum raw_ostream::Colors warningColor =
+  raw_ostream::MAGENTA;
+static const enum raw_ostream::Colors templateColor =
+  raw_ostream::CYAN;
+static const enum raw_ostream::Colors errorColor = raw_ostream::RED;
+static const enum raw_ostream::Colors fatalColor = raw_ostream::RED;
+// Used for changing only the bold attribute.
+static const enum raw_ostream::Colors savedColor =
+  raw_ostream::SAVEDCOLOR;
+
+/// Add highlights to differences in template strings.
+static void applyTemplateHighlighting(raw_ostream &OS, StringRef Str,
+                                      bool &Normal, bool Bold) {
+  while (true) {
+    size_t Pos = Str.find(ToggleHighlight);
+    OS << Str.slice(0, Pos);
+    if (Pos == StringRef::npos)
+      break;
+
+    Str = Str.substr(Pos + 1);
+    if (Normal)
+      OS.changeColor(templateColor, true);
+    else {
+      OS.resetColor();
+      if (Bold)
+        OS.changeColor(savedColor, true);
+    }
+    Normal = !Normal;
+  }
+}
+
+/// Number of spaces to indent when word-wrapping.
+const unsigned WordWrapIndentation = 6;
+
+static int bytesSincePreviousTabOrLineBegin(StringRef SourceLine, size_t i) {
+  int bytes = 0;
+  while (0<i) {
+    if (SourceLine[--i]=='\t')
+      break;
+    ++bytes;
+  }
+  return bytes;
+}
+
+/// returns a printable representation of first item from input range
+///
+/// This function returns a printable representation of the next item in a line
+///  of source. If the next byte begins a valid and printable character, that
+///  character is returned along with 'true'.
+///
+/// Otherwise, if the next byte begins a valid, but unprintable character, a
+///  printable, escaped representation of the character is returned, along with
+///  'false'. Otherwise a printable, escaped representation of the next byte
+///  is returned along with 'false'.
+///
+/// \note The index is updated to be used with a subsequent call to
+///        printableTextForNextCharacter.
+///
+/// \param SourceLine The line of source
+/// \param i Pointer to byte index,
+/// \param TabStop used to expand tabs
+/// \return pair(printable text, 'true' iff original text was printable)
+///
+static std::pair<SmallString<16>, bool>
+printableTextForNextCharacter(StringRef SourceLine, size_t *i,
+                              unsigned TabStop) {
+  assert(i && "i must not be null");
+  assert(*i<SourceLine.size() && "must point to a valid index");
+
+  if (SourceLine[*i]=='\t') {
+    assert(0 < TabStop && TabStop <= DiagnosticOptions::MaxTabStop &&
+           "Invalid -ftabstop value");
+    unsigned col = bytesSincePreviousTabOrLineBegin(SourceLine, *i);
+    unsigned NumSpaces = TabStop - col%TabStop;
+    assert(0 < NumSpaces && NumSpaces <= TabStop
+           && "Invalid computation of space amt");
+    ++(*i);
+
+    SmallString<16> expandedTab;
+    expandedTab.assign(NumSpaces, ' ');
+    return std::make_pair(expandedTab, true);
+  }
+
+  unsigned char const *begin, *end;
+  begin = reinterpret_cast<unsigned char const *>(&*(SourceLine.begin() + *i));
+  end = begin + (SourceLine.size() - *i);
+
+  if (llvm::isLegalUTF8Sequence(begin, end)) {
+    llvm::UTF32 c;
+    llvm::UTF32 *cptr = &c;
+    unsigned char const *original_begin = begin;
+    unsigned char const *cp_end =
+        begin + llvm::getNumBytesForUTF8(SourceLine[*i]);
+
+    llvm::ConversionResult res = llvm::ConvertUTF8toUTF32(
+        &begin, cp_end, &cptr, cptr + 1, llvm::strictConversion);
+    (void)res;
+    assert(llvm::conversionOK == res);
+    assert(0 < begin-original_begin
+           && "we must be further along in the string now");
+    *i += begin-original_begin;
+
+    if (!llvm::sys::locale::isPrint(c)) {
+      // If next character is valid UTF-8, but not printable
+      SmallString<16> expandedCP("<U+>");
+      while (c) {
+        expandedCP.insert(expandedCP.begin()+3, llvm::hexdigit(c%16));
+        c/=16;
+      }
+      while (expandedCP.size() < 8)
+        expandedCP.insert(expandedCP.begin()+3, llvm::hexdigit(0));
+      return std::make_pair(expandedCP, false);
+    }
+
+    // If next character is valid UTF-8, and printable
+    return std::make_pair(SmallString<16>(original_begin, cp_end), true);
+
+  }
+
+  // If next byte is not valid UTF-8 (and therefore not printable)
+  SmallString<16> expandedByte("<XX>");
+  unsigned char byte = SourceLine[*i];
+  expandedByte[1] = llvm::hexdigit(byte / 16);
+  expandedByte[2] = llvm::hexdigit(byte % 16);
+  ++(*i);
+  return std::make_pair(expandedByte, false);
+}
+
+static void expandTabs(std::string &SourceLine, unsigned TabStop) {
+  size_t i = SourceLine.size();
+  while (i>0) {
+    i--;
+    if (SourceLine[i]!='\t')
+      continue;
+    size_t tmp_i = i;
+    std::pair<SmallString<16>,bool> res
+      = printableTextForNextCharacter(SourceLine, &tmp_i, TabStop);
+    SourceLine.replace(i, 1, res.first.c_str());
+  }
+}
+
+/// This function takes a raw source line and produces a mapping from the bytes
+///  of the printable representation of the line to the columns those printable
+///  characters will appear at (numbering the first column as 0).
+///
+/// If a byte 'i' corresponds to multiple columns (e.g. the byte contains a tab
+///  character) then the array will map that byte to the first column the
+///  tab appears at and the next value in the map will have been incremented
+///  more than once.
+///
+/// If a byte is the first in a sequence of bytes that together map to a single
+///  entity in the output, then the array will map that byte to the appropriate
+///  column while the subsequent bytes will be -1.
+///
+/// The last element in the array does not correspond to any byte in the input
+///  and instead is the number of columns needed to display the source
+///
+/// example: (given a tabstop of 8)
+///
+///    "a \t \u3042" -> {0,1,2,8,9,-1,-1,11}
+///
+///  (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
+///   display)
+static void byteToColumn(StringRef SourceLine, unsigned TabStop,
+                         SmallVectorImpl<int> &out) {
+  out.clear();
+
+  if (SourceLine.empty()) {
+    out.resize(1u,0);
+    return;
+  }
+
+  out.resize(SourceLine.size()+1, -1);
+
+  int columns = 0;
+  size_t i = 0;
+  while (i<SourceLine.size()) {
+    out[i] = columns;
+    std::pair<SmallString<16>,bool> res
+      = printableTextForNextCharacter(SourceLine, &i, TabStop);
+    columns += llvm::sys::locale::columnWidth(res.first);
+  }
+  out.back() = columns;
+}
+
+/// This function takes a raw source line and produces a mapping from columns
+///  to the byte of the source line that produced the character displaying at
+///  that column. This is the inverse of the mapping produced by byteToColumn()
+///
+/// The last element in the array is the number of bytes in the source string
+///
+/// example: (given a tabstop of 8)
+///
+///    "a \t \u3042" -> {0,1,2,-1,-1,-1,-1,-1,3,4,-1,7}
+///
+///  (\\u3042 is represented in UTF-8 by three bytes and takes two columns to
+///   display)
+static void columnToByte(StringRef SourceLine, unsigned TabStop,
+                         SmallVectorImpl<int> &out) {
+  out.clear();
+
+  if (SourceLine.empty()) {
+    out.resize(1u, 0);
+    return;
+  }
+
+  int columns = 0;
+  size_t i = 0;
+  while (i<SourceLine.size()) {
+    out.resize(columns+1, -1);
+    out.back() = i;
+    std::pair<SmallString<16>,bool> res
+      = printableTextForNextCharacter(SourceLine, &i, TabStop);
+    columns += llvm::sys::locale::columnWidth(res.first);
+  }
+  out.resize(columns+1, -1);
+  out.back() = i;
+}
+
+namespace {
+struct SourceColumnMap {
+  SourceColumnMap(StringRef SourceLine, unsigned TabStop)
+  : m_SourceLine(SourceLine) {
+
+    ::byteToColumn(SourceLine, TabStop, m_byteToColumn);
+    ::columnToByte(SourceLine, TabStop, m_columnToByte);
+
+    assert(m_byteToColumn.size()==SourceLine.size()+1);
+    assert(0 < m_byteToColumn.size() && 0 < m_columnToByte.size());
+    assert(m_byteToColumn.size()
+           == static_cast<unsigned>(m_columnToByte.back()+1));
+    assert(static_cast<unsigned>(m_byteToColumn.back()+1)
+           == m_columnToByte.size());
+  }
+  int columns() const { return m_byteToColumn.back(); }
+  int bytes() const { return m_columnToByte.back(); }
+
+  /// Map a byte to the column which it is at the start of, or return -1
+  /// if it is not at the start of a column (for a UTF-8 trailing byte).
+  int byteToColumn(int n) const {
+    assert(0<=n && n<static_cast<int>(m_byteToColumn.size()));
+    return m_byteToColumn[n];
+  }
+
+  /// Map a byte to the first column which contains it.
+  int byteToContainingColumn(int N) const {
+    assert(0 <= N && N < static_cast<int>(m_byteToColumn.size()));
+    while (m_byteToColumn[N] == -1)
+      --N;
+    return m_byteToColumn[N];
+  }
+
+  /// Map a column to the byte which starts the column, or return -1 if
+  /// the column the second or subsequent column of an expanded tab or similar
+  /// multi-column entity.
+  int columnToByte(int n) const {
+    assert(0<=n && n<static_cast<int>(m_columnToByte.size()));
+    return m_columnToByte[n];
+  }
+
+  /// Map from a byte index to the next byte which starts a column.
+  int startOfNextColumn(int N) const {
+    assert(0 <= N && N < static_cast<int>(m_byteToColumn.size() - 1));
+    while (byteToColumn(++N) == -1) {}
+    return N;
+  }
+
+  /// Map from a byte index to the previous byte which starts a column.
+  int startOfPreviousColumn(int N) const {
+    assert(0 < N && N < static_cast<int>(m_byteToColumn.size()));
+    while (byteToColumn(--N) == -1) {}
+    return N;
+  }
+
+  StringRef getSourceLine() const {
+    return m_SourceLine;
+  }
+
+private:
+  const std::string m_SourceLine;
+  SmallVector<int,200> m_byteToColumn;
+  SmallVector<int,200> m_columnToByte;
+};
+} // end anonymous namespace
+
+/// When the source code line we want to print is too long for
+/// the terminal, select the "interesting" region.
+static void selectInterestingSourceRegion(std::string &SourceLine,
+                                          std::string &CaretLine,
+                                          std::string &FixItInsertionLine,
+                                          unsigned Columns,
+                                          const SourceColumnMap &map) {
+  unsigned CaretColumns = CaretLine.size();
+  unsigned FixItColumns = llvm::sys::locale::columnWidth(FixItInsertionLine);
+  unsigned MaxColumns = std::max(static_cast<unsigned>(map.columns()),
+                                 std::max(CaretColumns, FixItColumns));
+  // if the number of columns is less than the desired number we're done
+  if (MaxColumns <= Columns)
+    return;
+
+  // No special characters are allowed in CaretLine.
+  assert(CaretLine.end() ==
+         llvm::find_if(CaretLine, [](char c) { return c < ' ' || '~' < c; }));
+
+  // Find the slice that we need to display the full caret line
+  // correctly.
+  unsigned CaretStart = 0, CaretEnd = CaretLine.size();
+  for (; CaretStart != CaretEnd; ++CaretStart)
+    if (!isWhitespace(CaretLine[CaretStart]))
+      break;
+
+  for (; CaretEnd != CaretStart; --CaretEnd)
+    if (!isWhitespace(CaretLine[CaretEnd - 1]))
+      break;
+
+  // caret has already been inserted into CaretLine so the above whitespace
+  // check is guaranteed to include the caret
+
+  // If we have a fix-it line, make sure the slice includes all of the
+  // fix-it information.
+  if (!FixItInsertionLine.empty()) {
+    unsigned FixItStart = 0, FixItEnd = FixItInsertionLine.size();
+    for (; FixItStart != FixItEnd; ++FixItStart)
+      if (!isWhitespace(FixItInsertionLine[FixItStart]))
+        break;
+
+    for (; FixItEnd != FixItStart; --FixItEnd)
+      if (!isWhitespace(FixItInsertionLine[FixItEnd - 1]))
+        break;
+
+    // We can safely use the byte offset FixItStart as the column offset
+    // because the characters up until FixItStart are all ASCII whitespace
+    // characters.
+    unsigned FixItStartCol = FixItStart;
+    unsigned FixItEndCol
+      = llvm::sys::locale::columnWidth(FixItInsertionLine.substr(0, FixItEnd));
+
+    CaretStart = std::min(FixItStartCol, CaretStart);
+    CaretEnd = std::max(FixItEndCol, CaretEnd);
+  }
+
+  // CaretEnd may have been set at the middle of a character
+  // If it's not at a character's first column then advance it past the current
+  //   character.
+  while (static_cast<int>(CaretEnd) < map.columns() &&
+         -1 == map.columnToByte(CaretEnd))
+    ++CaretEnd;
+
+  assert((static_cast<int>(CaretStart) > map.columns() ||
+          -1!=map.columnToByte(CaretStart)) &&
+         "CaretStart must not point to a column in the middle of a source"
+         " line character");
+  assert((static_cast<int>(CaretEnd) > map.columns() ||
+          -1!=map.columnToByte(CaretEnd)) &&
+         "CaretEnd must not point to a column in the middle of a source line"
+         " character");
+
+  // CaretLine[CaretStart, CaretEnd) contains all of the interesting
+  // parts of the caret line. While this slice is smaller than the
+  // number of columns we have, try to grow the slice to encompass
+  // more context.
+
+  unsigned SourceStart = map.columnToByte(std::min<unsigned>(CaretStart,
+                                                             map.columns()));
+  unsigned SourceEnd = map.columnToByte(std::min<unsigned>(CaretEnd,
+                                                           map.columns()));
+
+  unsigned CaretColumnsOutsideSource = CaretEnd-CaretStart
+    - (map.byteToColumn(SourceEnd)-map.byteToColumn(SourceStart));
+
+  char const *front_ellipse = "  ...";
+  char const *front_space   = "     ";
+  char const *back_ellipse = "...";
+  unsigned ellipses_space = strlen(front_ellipse) + strlen(back_ellipse);
+
+  unsigned TargetColumns = Columns;
+  // Give us extra room for the ellipses
+  //  and any of the caret line that extends past the source
+  if (TargetColumns > ellipses_space+CaretColumnsOutsideSource)
+    TargetColumns -= ellipses_space+CaretColumnsOutsideSource;
+
+  while (SourceStart>0 || SourceEnd<SourceLine.size()) {
+    bool ExpandedRegion = false;
+
+    if (SourceStart>0) {
+      unsigned NewStart = map.startOfPreviousColumn(SourceStart);
+
+      // Skip over any whitespace we see here; we're looking for
+      // another bit of interesting text.
+      // FIXME: Detect non-ASCII whitespace characters too.
+      while (NewStart && isWhitespace(SourceLine[NewStart]))
+        NewStart = map.startOfPreviousColumn(NewStart);
+
+      // Skip over this bit of "interesting" text.
+      while (NewStart) {
+        unsigned Prev = map.startOfPreviousColumn(NewStart);
+        if (isWhitespace(SourceLine[Prev]))
+          break;
+        NewStart = Prev;
+      }
+
+      assert(map.byteToColumn(NewStart) != -1);
+      unsigned NewColumns = map.byteToColumn(SourceEnd) -
+                              map.byteToColumn(NewStart);
+      if (NewColumns <= TargetColumns) {
+        SourceStart = NewStart;
+        ExpandedRegion = true;
+      }
+    }
+
+    if (SourceEnd<SourceLine.size()) {
+      unsigned NewEnd = map.startOfNextColumn(SourceEnd);
+
+      // Skip over any whitespace we see here; we're looking for
+      // another bit of interesting text.
+      // FIXME: Detect non-ASCII whitespace characters too.
+      while (NewEnd < SourceLine.size() && isWhitespace(SourceLine[NewEnd]))
+        NewEnd = map.startOfNextColumn(NewEnd);
+
+      // Skip over this bit of "interesting" text.
+      while (NewEnd < SourceLine.size() && isWhitespace(SourceLine[NewEnd]))
+        NewEnd = map.startOfNextColumn(NewEnd);
+
+      assert(map.byteToColumn(NewEnd) != -1);
+      unsigned NewColumns = map.byteToColumn(NewEnd) -
+                              map.byteToColumn(SourceStart);
+      if (NewColumns <= TargetColumns) {
+        SourceEnd = NewEnd;
+        ExpandedRegion = true;
+      }
+    }
+
+    if (!ExpandedRegion)
+      break;
+  }
+
+  CaretStart = map.byteToColumn(SourceStart);
+  CaretEnd = map.byteToColumn(SourceEnd) + CaretColumnsOutsideSource;
+
+  // [CaretStart, CaretEnd) is the slice we want. Update the various
+  // output lines to show only this slice, with two-space padding
+  // before the lines so that it looks nicer.
+
+  assert(CaretStart!=(unsigned)-1 && CaretEnd!=(unsigned)-1 &&
+         SourceStart!=(unsigned)-1 && SourceEnd!=(unsigned)-1);
+  assert(SourceStart <= SourceEnd);
+  assert(CaretStart <= CaretEnd);
+
+  unsigned BackColumnsRemoved
+    = map.byteToColumn(SourceLine.size())-map.byteToColumn(SourceEnd);
+  unsigned FrontColumnsRemoved = CaretStart;
+  unsigned ColumnsKept = CaretEnd-CaretStart;
+
+  // We checked up front that the line needed truncation
+  assert(FrontColumnsRemoved+ColumnsKept+BackColumnsRemoved > Columns);
+
+  // The line needs some truncation, and we'd prefer to keep the front
+  //  if possible, so remove the back
+  if (BackColumnsRemoved > strlen(back_ellipse))
+    SourceLine.replace(SourceEnd, std::string::npos, back_ellipse);
+
+  // If that's enough then we're done
+  if (FrontColumnsRemoved+ColumnsKept <= Columns)
+    return;
+
+  // Otherwise remove the front as well
+  if (FrontColumnsRemoved > strlen(front_ellipse)) {
+    SourceLine.replace(0, SourceStart, front_ellipse);
+    CaretLine.replace(0, CaretStart, front_space);
+    if (!FixItInsertionLine.empty())
+      FixItInsertionLine.replace(0, CaretStart, front_space);
+  }
+}
+
+/// Skip over whitespace in the string, starting at the given
+/// index.
+///
+/// \returns The index of the first non-whitespace character that is
+/// greater than or equal to Idx or, if no such character exists,
+/// returns the end of the string.
+static unsigned skipWhitespace(unsigned Idx, StringRef Str, unsigned Length) {
+  while (Idx < Length && isWhitespace(Str[Idx]))
+    ++Idx;
+  return Idx;
+}
+
+/// If the given character is the start of some kind of
+/// balanced punctuation (e.g., quotes or parentheses), return the
+/// character that will terminate the punctuation.
+///
+/// \returns The ending punctuation character, if any, or the NULL
+/// character if the input character does not start any punctuation.
+static inline char findMatchingPunctuation(char c) {
+  switch (c) {
+  case '\'': return '\'';
+  case '`': return '\'';
+  case '"':  return '"';
+  case '(':  return ')';
+  case '[': return ']';
+  case '{': return '}';
+  default: break;
+  }
+
+  return 0;
+}
+
+/// Find the end of the word starting at the given offset
+/// within a string.
+///
+/// \returns the index pointing one character past the end of the
+/// word.
+static unsigned findEndOfWord(unsigned Start, StringRef Str,
+                              unsigned Length, unsigned Column,
+                              unsigned Columns) {
+  assert(Start < Str.size() && "Invalid start position!");
+  unsigned End = Start + 1;
+
+  // If we are already at the end of the string, take that as the word.
+  if (End == Str.size())
+    return End;
+
+  // Determine if the start of the string is actually opening
+  // punctuation, e.g., a quote or parentheses.
+  char EndPunct = findMatchingPunctuation(Str[Start]);
+  if (!EndPunct) {
+    // This is a normal word. Just find the first space character.
+    while (End < Length && !isWhitespace(Str[End]))
+      ++End;
+    return End;
+  }
+
+  // We have the start of a balanced punctuation sequence (quotes,
+  // parentheses, etc.). Determine the full sequence is.
+  SmallString<16> PunctuationEndStack;
+  PunctuationEndStack.push_back(EndPunct);
+  while (End < Length && !PunctuationEndStack.empty()) {
+    if (Str[End] == PunctuationEndStack.back())
+      PunctuationEndStack.pop_back();
+    else if (char SubEndPunct = findMatchingPunctuation(Str[End]))
+      PunctuationEndStack.push_back(SubEndPunct);
+
+    ++End;
+  }
+
+  // Find the first space character after the punctuation ended.
+  while (End < Length && !isWhitespace(Str[End]))
+    ++End;
+
+  unsigned PunctWordLength = End - Start;
+  if (// If the word fits on this line
+      Column + PunctWordLength <= Columns ||
+      // ... or the word is "short enough" to take up the next line
+      // without too much ugly white space
+      PunctWordLength < Columns/3)
+    return End; // Take the whole thing as a single "word".
+
+  // The whole quoted/parenthesized string is too long to print as a
+  // single "word". Instead, find the "word" that starts just after
+  // the punctuation and use that end-point instead. This will recurse
+  // until it finds something small enough to consider a word.
+  return findEndOfWord(Start + 1, Str, Length, Column + 1, Columns);
+}
+
+/// Print the given string to a stream, word-wrapping it to
+/// some number of columns in the process.
+///
+/// \param OS the stream to which the word-wrapping string will be
+/// emitted.
+/// \param Str the string to word-wrap and output.
+/// \param Columns the number of columns to word-wrap to.
+/// \param Column the column number at which the first character of \p
+/// Str will be printed. This will be non-zero when part of the first
+/// line has already been printed.
+/// \param Bold if the current text should be bold
+/// \param Indentation the number of spaces to indent any lines beyond
+/// the first line.
+/// \returns true if word-wrapping was required, or false if the
+/// string fit on the first line.
+static bool printWordWrapped(raw_ostream &OS, StringRef Str,
+                             unsigned Columns,
+                             unsigned Column = 0,
+                             bool Bold = false,
+                             unsigned Indentation = WordWrapIndentation) {
+  const unsigned Length = std::min(Str.find('\n'), Str.size());
+  bool TextNormal = true;
+
+  // The string used to indent each line.
+  SmallString<16> IndentStr;
+  IndentStr.assign(Indentation, ' ');
+  bool Wrapped = false;
+  for (unsigned WordStart = 0, WordEnd; WordStart < Length;
+       WordStart = WordEnd) {
+    // Find the beginning of the next word.
+    WordStart = skipWhitespace(WordStart, Str, Length);
+    if (WordStart == Length)
+      break;
+
+    // Find the end of this word.
+    WordEnd = findEndOfWord(WordStart, Str, Length, Column, Columns);
+
+    // Does this word fit on the current line?
+    unsigned WordLength = WordEnd - WordStart;
+    if (Column + WordLength < Columns) {
+      // This word fits on the current line; print it there.
+      if (WordStart) {
+        OS << ' ';
+        Column += 1;
+      }
+      applyTemplateHighlighting(OS, Str.substr(WordStart, WordLength),
+                                TextNormal, Bold);
+      Column += WordLength;
+      continue;
+    }
+
+    // This word does not fit on the current line, so wrap to the next
+    // line.
+    OS << '\n';
+    OS.write(&IndentStr[0], Indentation);
+    applyTemplateHighlighting(OS, Str.substr(WordStart, WordLength),
+                              TextNormal, Bold);
+    Column = Indentation + WordLength;
+    Wrapped = true;
+  }
+
+  // Append any remaning text from the message with its existing formatting.
+  applyTemplateHighlighting(OS, Str.substr(Length), TextNormal, Bold);
+
+  assert(TextNormal && "Text highlighted at end of diagnostic message.");
+
+  return Wrapped;
+}
+
+TextDiagnostic::TextDiagnostic(raw_ostream &OS,
+                               const LangOptions &LangOpts,
+                               DiagnosticOptions *DiagOpts)
+  : DiagnosticRenderer(LangOpts, DiagOpts), OS(OS) {}
+
+TextDiagnostic::~TextDiagnostic() {}
+
+void TextDiagnostic::emitDiagnosticMessage(
+    FullSourceLoc Loc, PresumedLoc PLoc, DiagnosticsEngine::Level Level,
+    StringRef Message, ArrayRef<clang::CharSourceRange> Ranges,
+    DiagOrStoredDiag D) {
+  uint64_t StartOfLocationInfo = OS.tell();
+
+  // Emit the location of this particular diagnostic.
+  if (Loc.isValid())
+    emitDiagnosticLoc(Loc, PLoc, Level, Ranges);
+
+  if (DiagOpts->ShowColors)
+    OS.resetColor();
+
+  if (DiagOpts->ShowLevel)
+    printDiagnosticLevel(OS, Level, DiagOpts->ShowColors);
+  printDiagnosticMessage(OS,
+                         /*IsSupplemental*/ Level == DiagnosticsEngine::Note,
+                         Message, OS.tell() - StartOfLocationInfo,
+                         DiagOpts->MessageLength, DiagOpts->ShowColors);
+}
+
+/*static*/ void
+TextDiagnostic::printDiagnosticLevel(raw_ostream &OS,
+                                     DiagnosticsEngine::Level Level,
+                                     bool ShowColors) {
+  if (ShowColors) {
+    // Print diagnostic category in bold and color
+    switch (Level) {
+    case DiagnosticsEngine::Ignored:
+      llvm_unreachable("Invalid diagnostic type");
+    case DiagnosticsEngine::Note:    OS.changeColor(noteColor, true); break;
+    case DiagnosticsEngine::Remark:  OS.changeColor(remarkColor, true); break;
+    case DiagnosticsEngine::Warning: OS.changeColor(warningColor, true); break;
+    case DiagnosticsEngine::Error:   OS.changeColor(errorColor, true); break;
+    case DiagnosticsEngine::Fatal:   OS.changeColor(fatalColor, true); break;
+    }
+  }
+
+  switch (Level) {
+  case DiagnosticsEngine::Ignored:
+    llvm_unreachable("Invalid diagnostic type");
+  case DiagnosticsEngine::Note:    OS << "note: "; break;
+  case DiagnosticsEngine::Remark:  OS << "remark: "; break;
+  case DiagnosticsEngine::Warning: OS << "warning: "; break;
+  case DiagnosticsEngine::Error:   OS << "error: "; break;
+  case DiagnosticsEngine::Fatal:   OS << "fatal error: "; break;
+  }
+
+  if (ShowColors)
+    OS.resetColor();
+}
+
+/*static*/
+void TextDiagnostic::printDiagnosticMessage(raw_ostream &OS,
+                                            bool IsSupplemental,
+                                            StringRef Message,
+                                            unsigned CurrentColumn,
+                                            unsigned Columns, bool ShowColors) {
+  bool Bold = false;
+  if (ShowColors && !IsSupplemental) {
+    // Print primary diagnostic messages in bold and without color, to visually
+    // indicate the transition from continuation notes and other output.
+    OS.changeColor(savedColor, true);
+    Bold = true;
+  }
+
+  if (Columns)
+    printWordWrapped(OS, Message, Columns, CurrentColumn, Bold);
+  else {
+    bool Normal = true;
+    applyTemplateHighlighting(OS, Message, Normal, Bold);
+    assert(Normal && "Formatting should have returned to normal");
+  }
+
+  if (ShowColors)
+    OS.resetColor();
+  OS << '\n';
+}
+
+void TextDiagnostic::emitFilename(StringRef Filename, const SourceManager &SM) {
+#ifdef _WIN32
+  SmallString<4096> TmpFilename;
+#endif
+  if (DiagOpts->AbsolutePath) {
+    auto File = SM.getFileManager().getFile(Filename);
+    if (File) {
+      // We want to print a simplified absolute path, i. e. without "dots".
+      //
+      // The hardest part here are the paths like "<part1>/<link>/../<part2>".
+      // On Unix-like systems, we cannot just collapse "<link>/..", because
+      // paths are resolved sequentially, and, thereby, the path
+      // "<part1>/<part2>" may point to a different location. That is why
+      // we use FileManager::getCanonicalName(), which expands all indirections
+      // with llvm::sys::fs::real_path() and caches the result.
+      //
+      // On the other hand, it would be better to preserve as much of the
+      // original path as possible, because that helps a user to recognize it.
+      // real_path() expands all links, which sometimes too much. Luckily,
+      // on Windows we can just use llvm::sys::path::remove_dots(), because,
+      // on that system, both aforementioned paths point to the same place.
+#ifdef _WIN32
+      TmpFilename = (*File)->getName();
+      llvm::sys::fs::make_absolute(TmpFilename);
+      llvm::sys::path::native(TmpFilename);
+      llvm::sys::path::remove_dots(TmpFilename, /* remove_dot_dot */ true);
+      Filename = StringRef(TmpFilename.data(), TmpFilename.size());
+#else
+      Filename = SM.getFileManager().getCanonicalName(*File);
+#endif
+    }
+  }
+
+  OS << Filename;
+}
+
+/// Print out the file/line/column information and include trace.
+///
+/// This method handlen the emission of the diagnostic location information.
+/// This includes extracting as much location information as is present for
+/// the diagnostic and printing it, as well as any include stack or source
+/// ranges necessary.
+void TextDiagnostic::emitDiagnosticLoc(FullSourceLoc Loc, PresumedLoc PLoc,
+                                       DiagnosticsEngine::Level Level,
+                                       ArrayRef<CharSourceRange> Ranges) {
+  if (PLoc.isInvalid()) {
+    // At least print the file name if available:
+    FileID FID = Loc.getFileID();
+    if (FID.isValid()) {
+      const FileEntry *FE = Loc.getFileEntry();
+      if (FE && FE->isValid()) {
+        emitFilename(FE->getName(), Loc.getManager());
+        OS << ": ";
+      }
+    }
+    return;
+  }
+  unsigned LineNo = PLoc.getLine();
+
+  if (!DiagOpts->ShowLocation)
+    return;
+
+  if (DiagOpts->ShowColors)
+    OS.changeColor(savedColor, true);
+
+  emitFilename(PLoc.getFilename(), Loc.getManager());
+  switch (DiagOpts->getFormat()) {
+  case DiagnosticOptions::Clang:
+    if (DiagOpts->ShowLine)
+      OS << ':' << LineNo;
+    break;
+  case DiagnosticOptions::MSVC:  OS << '('  << LineNo; break;
+  case DiagnosticOptions::Vi:    OS << " +" << LineNo; break;
+  }
+
+  if (DiagOpts->ShowColumn)
+    // Compute the column number.
+    if (unsigned ColNo = PLoc.getColumn()) {
+      if (DiagOpts->getFormat() == DiagnosticOptions::MSVC) {
+        OS << ',';
+        // Visual Studio 2010 or earlier expects column number to be off by one
+        if (LangOpts.MSCompatibilityVersion &&
+            !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2012))
+          ColNo--;
+      } else
+        OS << ':';
+      OS << ColNo;
+    }
+  switch (DiagOpts->getFormat()) {
+  case DiagnosticOptions::Clang:
+  case DiagnosticOptions::Vi:    OS << ':';    break;
+  case DiagnosticOptions::MSVC:
+    // MSVC2013 and before print 'file(4) : error'. MSVC2015 gets rid of the
+    // space and prints 'file(4): error'.
+    OS << ')';
+    if (LangOpts.MSCompatibilityVersion &&
+        !LangOpts.isCompatibleWithMSVC(LangOptions::MSVC2015))
+      OS << ' ';
+    OS << ':';
+    break;
+  }
+
+  if (DiagOpts->ShowSourceRanges && !Ranges.empty()) {
+    FileID CaretFileID = Loc.getExpansionLoc().getFileID();
+    bool PrintedRange = false;
+
+    for (ArrayRef<CharSourceRange>::const_iterator RI = Ranges.begin(),
+         RE = Ranges.end();
+         RI != RE; ++RI) {
+      // Ignore invalid ranges.
+      if (!RI->isValid()) continue;
+
+      auto &SM = Loc.getManager();
+      SourceLocation B = SM.getExpansionLoc(RI->getBegin());
+      CharSourceRange ERange = SM.getExpansionRange(RI->getEnd());
+      SourceLocation E = ERange.getEnd();
+      bool IsTokenRange = ERange.isTokenRange();
+
+      std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(B);
+      std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(E);
+
+      // If the start or end of the range is in another file, just discard
+      // it.
+      if (BInfo.first != CaretFileID || EInfo.first != CaretFileID)
+        continue;
+
+      // Add in the length of the token, so that we cover multi-char
+      // tokens.
+      unsigned TokSize = 0;
+      if (IsTokenRange)
+        TokSize = Lexer::MeasureTokenLength(E, SM, LangOpts);
+
+      FullSourceLoc BF(B, SM), EF(E, SM);
+      OS << '{'
+         << BF.getLineNumber() << ':' << BF.getColumnNumber() << '-'
+         << EF.getLineNumber() << ':' << (EF.getColumnNumber() + TokSize)
+         << '}';
+      PrintedRange = true;
+    }
+
+    if (PrintedRange)
+      OS << ':';
+  }
+  OS << ' ';
+}
+
+void TextDiagnostic::emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) {
+  if (DiagOpts->ShowLocation && PLoc.isValid())
+    OS << "In file included from " << PLoc.getFilename() << ':'
+       << PLoc.getLine() << ":\n";
+  else
+    OS << "In included file:\n";
+}
+
+void TextDiagnostic::emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
+                                        StringRef ModuleName) {
+  if (DiagOpts->ShowLocation && PLoc.isValid())
+    OS << "In module '" << ModuleName << "' imported from "
+       << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
+  else
+    OS << "In module '" << ModuleName << "':\n";
+}
+
+void TextDiagnostic::emitBuildingModuleLocation(FullSourceLoc Loc,
+                                                PresumedLoc PLoc,
+                                                StringRef ModuleName) {
+  if (DiagOpts->ShowLocation && PLoc.isValid())
+    OS << "While building module '" << ModuleName << "' imported from "
+      << PLoc.getFilename() << ':' << PLoc.getLine() << ":\n";
+  else
+    OS << "While building module '" << ModuleName << "':\n";
+}
+
+/// Find the suitable set of lines to show to include a set of ranges.
+static llvm::Optional<std::pair<unsigned, unsigned>>
+findLinesForRange(const CharSourceRange &R, FileID FID,
+                  const SourceManager &SM) {
+  if (!R.isValid()) return None;
+
+  SourceLocation Begin = R.getBegin();
+  SourceLocation End = R.getEnd();
+  if (SM.getFileID(Begin) != FID || SM.getFileID(End) != FID)
+    return None;
+
+  return std::make_pair(SM.getExpansionLineNumber(Begin),
+                        SM.getExpansionLineNumber(End));
+}
+
+/// Add as much of range B into range A as possible without exceeding a maximum
+/// size of MaxRange. Ranges are inclusive.
+static std::pair<unsigned, unsigned>
+maybeAddRange(std::pair<unsigned, unsigned> A, std::pair<unsigned, unsigned> B,
+              unsigned MaxRange) {
+  // If A is already the maximum size, we're done.
+  unsigned Slack = MaxRange - (A.second - A.first + 1);
+  if (Slack == 0)
+    return A;
+
+  // Easy case: merge succeeds within MaxRange.
+  unsigned Min = std::min(A.first, B.first);
+  unsigned Max = std::max(A.second, B.second);
+  if (Max - Min + 1 <= MaxRange)
+    return {Min, Max};
+
+  // If we can't reach B from A within MaxRange, there's nothing to do.
+  // Don't add lines to the range that contain nothing interesting.
+  if ((B.first > A.first && B.first - A.first + 1 > MaxRange) ||
+      (B.second < A.second && A.second - B.second + 1 > MaxRange))
+    return A;
+
+  // Otherwise, expand A towards B to produce a range of size MaxRange. We
+  // attempt to expand by the same amount in both directions if B strictly
+  // contains A.
+
+  // Expand downwards by up to half the available amount, then upwards as
+  // much as possible, then downwards as much as possible.
+  A.second = std::min(A.second + (Slack + 1) / 2, Max);
+  Slack = MaxRange - (A.second - A.first + 1);
+  A.first = std::max(Min + Slack, A.first) - Slack;
+  A.second = std::min(A.first + MaxRange - 1, Max);
+  return A;
+}
+
+/// Highlight a SourceRange (with ~'s) for any characters on LineNo.
+static void highlightRange(const CharSourceRange &R,
+                           unsigned LineNo, FileID FID,
+                           const SourceColumnMap &map,
+                           std::string &CaretLine,
+                           const SourceManager &SM,
+                           const LangOptions &LangOpts) {
+  if (!R.isValid()) return;
+
+  SourceLocation Begin = R.getBegin();
+  SourceLocation End = R.getEnd();
+
+  unsigned StartLineNo = SM.getExpansionLineNumber(Begin);
+  if (StartLineNo > LineNo || SM.getFileID(Begin) != FID)
+    return;  // No intersection.
+
+  unsigned EndLineNo = SM.getExpansionLineNumber(End);
+  if (EndLineNo < LineNo || SM.getFileID(End) != FID)
+    return;  // No intersection.
+
+  // Compute the column number of the start.
+  unsigned StartColNo = 0;
+  if (StartLineNo == LineNo) {
+    StartColNo = SM.getExpansionColumnNumber(Begin);
+    if (StartColNo) --StartColNo;  // Zero base the col #.
+  }
+
+  // Compute the column number of the end.
+  unsigned EndColNo = map.getSourceLine().size();
+  if (EndLineNo == LineNo) {
+    EndColNo = SM.getExpansionColumnNumber(End);
+    if (EndColNo) {
+      --EndColNo;  // Zero base the col #.
+
+      // Add in the length of the token, so that we cover multi-char tokens if
+      // this is a token range.
+      if (R.isTokenRange())
+        EndColNo += Lexer::MeasureTokenLength(End, SM, LangOpts);
+    } else {
+      EndColNo = CaretLine.size();
+    }
+  }
+
+  assert(StartColNo <= EndColNo && "Invalid range!");
+
+  // Check that a token range does not highlight only whitespace.
+  if (R.isTokenRange()) {
+    // Pick the first non-whitespace column.
+    while (StartColNo < map.getSourceLine().size() &&
+           (map.getSourceLine()[StartColNo] == ' ' ||
+            map.getSourceLine()[StartColNo] == '\t'))
+      StartColNo = map.startOfNextColumn(StartColNo);
+
+    // Pick the last non-whitespace column.
+    if (EndColNo > map.getSourceLine().size())
+      EndColNo = map.getSourceLine().size();
+    while (EndColNo &&
+           (map.getSourceLine()[EndColNo-1] == ' ' ||
+            map.getSourceLine()[EndColNo-1] == '\t'))
+      EndColNo = map.startOfPreviousColumn(EndColNo);
+
+    // If the start/end passed each other, then we are trying to highlight a
+    // range that just exists in whitespace. That most likely means we have
+    // a multi-line highlighting range that covers a blank line.
+    if (StartColNo > EndColNo) {
+      assert(StartLineNo != EndLineNo && "trying to highlight whitespace");
+      StartColNo = EndColNo;
+    }
+  }
+
+  assert(StartColNo <= map.getSourceLine().size() && "Invalid range!");
+  assert(EndColNo <= map.getSourceLine().size() && "Invalid range!");
+
+  // Fill the range with ~'s.
+  StartColNo = map.byteToContainingColumn(StartColNo);
+  EndColNo = map.byteToContainingColumn(EndColNo);
+
+  assert(StartColNo <= EndColNo && "Invalid range!");
+  if (CaretLine.size() < EndColNo)
+    CaretLine.resize(EndColNo,' ');
+  std::fill(CaretLine.begin()+StartColNo,CaretLine.begin()+EndColNo,'~');
+}
+
+static std::string buildFixItInsertionLine(FileID FID,
+                                           unsigned LineNo,
+                                           const SourceColumnMap &map,
+                                           ArrayRef<FixItHint> Hints,
+                                           const SourceManager &SM,
+                                           const DiagnosticOptions *DiagOpts) {
+  std::string FixItInsertionLine;
+  if (Hints.empty() || !DiagOpts->ShowFixits)
+    return FixItInsertionLine;
+  unsigned PrevHintEndCol = 0;
+
+  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
+       I != E; ++I) {
+    if (!I->CodeToInsert.empty()) {
+      // We have an insertion hint. Determine whether the inserted
+      // code contains no newlines and is on the same line as the caret.
+      std::pair<FileID, unsigned> HintLocInfo
+        = SM.getDecomposedExpansionLoc(I->RemoveRange.getBegin());
+      if (FID == HintLocInfo.first &&
+          LineNo == SM.getLineNumber(HintLocInfo.first, HintLocInfo.second) &&
+          StringRef(I->CodeToInsert).find_first_of("\n\r") == StringRef::npos) {
+        // Insert the new code into the line just below the code
+        // that the user wrote.
+        // Note: When modifying this function, be very careful about what is a
+        // "column" (printed width, platform-dependent) and what is a
+        // "byte offset" (SourceManager "column").
+        unsigned HintByteOffset
+          = SM.getColumnNumber(HintLocInfo.first, HintLocInfo.second) - 1;
+
+        // The hint must start inside the source or right at the end
+        assert(HintByteOffset < static_cast<unsigned>(map.bytes())+1);
+        unsigned HintCol = map.byteToContainingColumn(HintByteOffset);
+
+        // If we inserted a long previous hint, push this one forwards, and add
+        // an extra space to show that this is not part of the previous
+        // completion. This is sort of the best we can do when two hints appear
+        // to overlap.
+        //
+        // Note that if this hint is located immediately after the previous
+        // hint, no space will be added, since the location is more important.
+        if (HintCol < PrevHintEndCol)
+          HintCol = PrevHintEndCol + 1;
+
+        // This should NOT use HintByteOffset, because the source might have
+        // Unicode characters in earlier columns.
+        unsigned NewFixItLineSize = FixItInsertionLine.size() +
+          (HintCol - PrevHintEndCol) + I->CodeToInsert.size();
+        if (NewFixItLineSize > FixItInsertionLine.size())
+          FixItInsertionLine.resize(NewFixItLineSize, ' ');
+
+        std::copy(I->CodeToInsert.begin(), I->CodeToInsert.end(),
+                  FixItInsertionLine.end() - I->CodeToInsert.size());
+
+        PrevHintEndCol =
+          HintCol + llvm::sys::locale::columnWidth(I->CodeToInsert);
+      }
+    }
+  }
+
+  expandTabs(FixItInsertionLine, DiagOpts->TabStop);
+
+  return FixItInsertionLine;
+}
+
+/// Emit a code snippet and caret line.
+///
+/// This routine emits a single line's code snippet and caret line..
+///
+/// \param Loc The location for the caret.
+/// \param Ranges The underlined ranges for this code snippet.
+/// \param Hints The FixIt hints active for this diagnostic.
+void TextDiagnostic::emitSnippetAndCaret(
+    FullSourceLoc Loc, DiagnosticsEngine::Level Level,
+    SmallVectorImpl<CharSourceRange> &Ranges, ArrayRef<FixItHint> Hints) {
+  assert(Loc.isValid() && "must have a valid source location here");
+  assert(Loc.isFileID() && "must have a file location here");
+
+  // If caret diagnostics are enabled and we have location, we want to
+  // emit the caret.  However, we only do this if the location moved
+  // from the last diagnostic, if the last diagnostic was a note that
+  // was part of a different warning or error diagnostic, or if the
+  // diagnostic has ranges.  We don't want to emit the same caret
+  // multiple times if one loc has multiple diagnostics.
+  if (!DiagOpts->ShowCarets)
+    return;
+  if (Loc == LastLoc && Ranges.empty() && Hints.empty() &&
+      (LastLevel != DiagnosticsEngine::Note || Level == LastLevel))
+    return;
+
+  // Decompose the location into a FID/Offset pair.
+  std::pair<FileID, unsigned> LocInfo = Loc.getDecomposedLoc();
+  FileID FID = LocInfo.first;
+  const SourceManager &SM = Loc.getManager();
+
+  // Get information about the buffer it points into.
+  bool Invalid = false;
+  StringRef BufData = Loc.getBufferData(&Invalid);
+  if (Invalid)
+    return;
+
+  unsigned CaretLineNo = Loc.getLineNumber();
+  unsigned CaretColNo = Loc.getColumnNumber();
+
+  // Arbitrarily stop showing snippets when the line is too long.
+  static const size_t MaxLineLengthToPrint = 4096;
+  if (CaretColNo > MaxLineLengthToPrint)
+    return;
+
+  // Find the set of lines to include.
+  const unsigned MaxLines = DiagOpts->SnippetLineLimit;
+  std::pair<unsigned, unsigned> Lines = {CaretLineNo, CaretLineNo};
+  for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
+                                                  E = Ranges.end();
+       I != E; ++I)
+    if (auto OptionalRange = findLinesForRange(*I, FID, SM))
+      Lines = maybeAddRange(Lines, *OptionalRange, MaxLines);
+
+  for (unsigned LineNo = Lines.first; LineNo != Lines.second + 1; ++LineNo) {
+    const char *BufStart = BufData.data();
+    const char *BufEnd = BufStart + BufData.size();
+
+    // Rewind from the current position to the start of the line.
+    const char *LineStart =
+        BufStart +
+        SM.getDecomposedLoc(SM.translateLineCol(FID, LineNo, 1)).second;
+    if (LineStart == BufEnd)
+      break;
+
+    // Compute the line end.
+    const char *LineEnd = LineStart;
+    while (*LineEnd != '\n' && *LineEnd != '\r' && LineEnd != BufEnd)
+      ++LineEnd;
+
+    // Arbitrarily stop showing snippets when the line is too long.
+    // FIXME: Don't print any lines in this case.
+    if (size_t(LineEnd - LineStart) > MaxLineLengthToPrint)
+      return;
+
+    // Trim trailing null-bytes.
+    StringRef Line(LineStart, LineEnd - LineStart);
+    while (!Line.empty() && Line.back() == '\0' &&
+           (LineNo != CaretLineNo || Line.size() > CaretColNo))
+      Line = Line.drop_back();
+
+    // Copy the line of code into an std::string for ease of manipulation.
+    std::string SourceLine(Line.begin(), Line.end());
+
+    // Build the byte to column map.
+    const SourceColumnMap sourceColMap(SourceLine, DiagOpts->TabStop);
+
+    // Create a line for the caret that is filled with spaces that is the same
+    // number of columns as the line of source code.
+    std::string CaretLine(sourceColMap.columns(), ' ');
+
+    // Highlight all of the characters covered by Ranges with ~ characters.
+    for (SmallVectorImpl<CharSourceRange>::iterator I = Ranges.begin(),
+                                                    E = Ranges.end();
+         I != E; ++I)
+      highlightRange(*I, LineNo, FID, sourceColMap, CaretLine, SM, LangOpts);
+
+    // Next, insert the caret itself.
+    if (CaretLineNo == LineNo) {
+      CaretColNo = sourceColMap.byteToContainingColumn(CaretColNo - 1);
+      if (CaretLine.size() < CaretColNo + 1)
+        CaretLine.resize(CaretColNo + 1, ' ');
+      CaretLine[CaretColNo] = '^';
+    }
+
+    std::string FixItInsertionLine = buildFixItInsertionLine(
+        FID, LineNo, sourceColMap, Hints, SM, DiagOpts.get());
+
+    // If the source line is too long for our terminal, select only the
+    // "interesting" source region within that line.
+    unsigned Columns = DiagOpts->MessageLength;
+    if (Columns)
+      selectInterestingSourceRegion(SourceLine, CaretLine, FixItInsertionLine,
+                                    Columns, sourceColMap);
+
+    // If we are in -fdiagnostics-print-source-range-info mode, we are trying
+    // to produce easily machine parsable output.  Add a space before the
+    // source line and the caret to make it trivial to tell the main diagnostic
+    // line from what the user is intended to see.
+    if (DiagOpts->ShowSourceRanges) {
+      SourceLine = ' ' + SourceLine;
+      CaretLine = ' ' + CaretLine;
+    }
+
+    // Finally, remove any blank spaces from the end of CaretLine.
+    while (!CaretLine.empty() && CaretLine[CaretLine.size() - 1] == ' ')
+      CaretLine.erase(CaretLine.end() - 1);
+
+    // Emit what we have computed.
+    emitSnippet(SourceLine);
+
+    if (!CaretLine.empty()) {
+      if (DiagOpts->ShowColors)
+        OS.changeColor(caretColor, true);
+      OS << CaretLine << '\n';
+      if (DiagOpts->ShowColors)
+        OS.resetColor();
+    }
+
+    if (!FixItInsertionLine.empty()) {
+      if (DiagOpts->ShowColors)
+        // Print fixit line in color
+        OS.changeColor(fixitColor, false);
+      if (DiagOpts->ShowSourceRanges)
+        OS << ' ';
+      OS << FixItInsertionLine << '\n';
+      if (DiagOpts->ShowColors)
+        OS.resetColor();
+    }
+  }
+
+  // Print out any parseable fixit information requested by the options.
+  emitParseableFixits(Hints, SM);
+}
+
+void TextDiagnostic::emitSnippet(StringRef line) {
+  if (line.empty())
+    return;
+
+  size_t i = 0;
+
+  std::string to_print;
+  bool print_reversed = false;
+
+  while (i<line.size()) {
+    std::pair<SmallString<16>,bool> res
+        = printableTextForNextCharacter(line, &i, DiagOpts->TabStop);
+    bool was_printable = res.second;
+
+    if (DiagOpts->ShowColors && was_printable == print_reversed) {
+      if (print_reversed)
+        OS.reverseColor();
+      OS << to_print;
+      to_print.clear();
+      if (DiagOpts->ShowColors)
+        OS.resetColor();
+    }
+
+    print_reversed = !was_printable;
+    to_print += res.first.str();
+  }
+
+  if (print_reversed && DiagOpts->ShowColors)
+    OS.reverseColor();
+  OS << to_print;
+  if (print_reversed && DiagOpts->ShowColors)
+    OS.resetColor();
+
+  OS << '\n';
+}
+
+void TextDiagnostic::emitParseableFixits(ArrayRef<FixItHint> Hints,
+                                         const SourceManager &SM) {
+  if (!DiagOpts->ShowParseableFixits)
+    return;
+
+  // We follow FixItRewriter's example in not (yet) handling
+  // fix-its in macros.
+  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
+       I != E; ++I) {
+    if (I->RemoveRange.isInvalid() ||
+        I->RemoveRange.getBegin().isMacroID() ||
+        I->RemoveRange.getEnd().isMacroID())
+      return;
+  }
+
+  for (ArrayRef<FixItHint>::iterator I = Hints.begin(), E = Hints.end();
+       I != E; ++I) {
+    SourceLocation BLoc = I->RemoveRange.getBegin();
+    SourceLocation ELoc = I->RemoveRange.getEnd();
+
+    std::pair<FileID, unsigned> BInfo = SM.getDecomposedLoc(BLoc);
+    std::pair<FileID, unsigned> EInfo = SM.getDecomposedLoc(ELoc);
+
+    // Adjust for token ranges.
+    if (I->RemoveRange.isTokenRange())
+      EInfo.second += Lexer::MeasureTokenLength(ELoc, SM, LangOpts);
+
+    // We specifically do not do word-wrapping or tab-expansion here,
+    // because this is supposed to be easy to parse.
+    PresumedLoc PLoc = SM.getPresumedLoc(BLoc);
+    if (PLoc.isInvalid())
+      break;
+
+    OS << "fix-it:\"";
+    OS.write_escaped(PLoc.getFilename());
+    OS << "\":{" << SM.getLineNumber(BInfo.first, BInfo.second)
+      << ':' << SM.getColumnNumber(BInfo.first, BInfo.second)
+      << '-' << SM.getLineNumber(EInfo.first, EInfo.second)
+      << ':' << SM.getColumnNumber(EInfo.first, EInfo.second)
+      << "}:\"";
+    OS.write_escaped(I->CodeToInsert);
+    OS << "\"\n";
+  }
+}
diff --git a/contrib/libs/clang14/lib/Frontend/TextDiagnosticBuffer.cpp b/contrib/libs/clang14/lib/Frontend/TextDiagnosticBuffer.cpp
new file mode 100644
index 0000000000..90f273e65f
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/TextDiagnosticBuffer.cpp
@@ -0,0 +1,74 @@
+//===- TextDiagnosticBuffer.cpp - Buffer Text Diagnostics -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a concrete diagnostic client, which buffers the diagnostic messages.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/TextDiagnosticBuffer.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace clang;
+
+/// HandleDiagnostic - Store the errors, warnings, and notes that are
+/// reported.
+void TextDiagnosticBuffer::HandleDiagnostic(DiagnosticsEngine::Level Level,
+                                            const Diagnostic &Info) {
+  // Default implementation (Warnings/errors count).
+  DiagnosticConsumer::HandleDiagnostic(Level, Info);
+
+  SmallString<100> Buf;
+  Info.FormatDiagnostic(Buf);
+  switch (Level) {
+  default: llvm_unreachable(
+                         "Diagnostic not handled during diagnostic buffering!");
+  case DiagnosticsEngine::Note:
+    All.emplace_back(Level, Notes.size());
+    Notes.emplace_back(Info.getLocation(), std::string(Buf.str()));
+    break;
+  case DiagnosticsEngine::Warning:
+    All.emplace_back(Level, Warnings.size());
+    Warnings.emplace_back(Info.getLocation(), std::string(Buf.str()));
+    break;
+  case DiagnosticsEngine::Remark:
+    All.emplace_back(Level, Remarks.size());
+    Remarks.emplace_back(Info.getLocation(), std::string(Buf.str()));
+    break;
+  case DiagnosticsEngine::Error:
+  case DiagnosticsEngine::Fatal:
+    All.emplace_back(Level, Errors.size());
+    Errors.emplace_back(Info.getLocation(), std::string(Buf.str()));
+    break;
+  }
+}
+
+void TextDiagnosticBuffer::FlushDiagnostics(DiagnosticsEngine &Diags) const {
+  for (const auto &I : All) {
+    auto Diag = Diags.Report(Diags.getCustomDiagID(I.first, "%0"));
+    switch (I.first) {
+    default: llvm_unreachable(
+                           "Diagnostic not handled during diagnostic flushing!");
+    case DiagnosticsEngine::Note:
+      Diag << Notes[I.second].second;
+      break;
+    case DiagnosticsEngine::Warning:
+      Diag << Warnings[I.second].second;
+      break;
+    case DiagnosticsEngine::Remark:
+      Diag << Remarks[I.second].second;
+      break;
+    case DiagnosticsEngine::Error:
+    case DiagnosticsEngine::Fatal:
+      Diag << Errors[I.second].second;
+      break;
+    }
+  }
+}
diff --git a/contrib/libs/clang14/lib/Frontend/TextDiagnosticPrinter.cpp b/contrib/libs/clang14/lib/Frontend/TextDiagnosticPrinter.cpp
new file mode 100644
index 0000000000..0ff5376098
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/TextDiagnosticPrinter.cpp
@@ -0,0 +1,156 @@
+//===--- TextDiagnosticPrinter.cpp - Diagnostic Printer -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This diagnostic client prints out their diagnostic messages.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/TextDiagnosticPrinter.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/TextDiagnostic.h"
+#include "clang/Lex/Lexer.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+using namespace clang;
+
+TextDiagnosticPrinter::TextDiagnosticPrinter(raw_ostream &os,
+                                             DiagnosticOptions *diags,
+                                             bool _OwnsOutputStream)
+  : OS(os), DiagOpts(diags),
+    OwnsOutputStream(_OwnsOutputStream) {
+}
+
+TextDiagnosticPrinter::~TextDiagnosticPrinter() {
+  if (OwnsOutputStream)
+    delete &OS;
+}
+
+void TextDiagnosticPrinter::BeginSourceFile(const LangOptions &LO,
+                                            const Preprocessor *PP) {
+  // Build the TextDiagnostic utility.
+  TextDiag.reset(new TextDiagnostic(OS, LO, &*DiagOpts));
+}
+
+void TextDiagnosticPrinter::EndSourceFile() {
+  TextDiag.reset();
+}
+
+/// Print any diagnostic option information to a raw_ostream.
+///
+/// This implements all of the logic for adding diagnostic options to a message
+/// (via OS). Each relevant option is comma separated and all are enclosed in
+/// the standard bracketing: " [...]".
+static void printDiagnosticOptions(raw_ostream &OS,
+                                   DiagnosticsEngine::Level Level,
+                                   const Diagnostic &Info,
+                                   const DiagnosticOptions &DiagOpts) {
+  bool Started = false;
+  if (DiagOpts.ShowOptionNames) {
+    // Handle special cases for non-warnings early.
+    if (Info.getID() == diag::fatal_too_many_errors) {
+      OS << " [-ferror-limit=]";
+      return;
+    }
+
+    // The code below is somewhat fragile because we are essentially trying to
+    // report to the user what happened by inferring what the diagnostic engine
+    // did. Eventually it might make more sense to have the diagnostic engine
+    // include some "why" information in the diagnostic.
+
+    // If this is a warning which has been mapped to an error by the user (as
+    // inferred by checking whether the default mapping is to an error) then
+    // flag it as such. Note that diagnostics could also have been mapped by a
+    // pragma, but we don't currently have a way to distinguish this.
+    if (Level == DiagnosticsEngine::Error &&
+        DiagnosticIDs::isBuiltinWarningOrExtension(Info.getID()) &&
+        !DiagnosticIDs::isDefaultMappingAsError(Info.getID())) {
+      OS << " [-Werror";
+      Started = true;
+    }
+
+    StringRef Opt = DiagnosticIDs::getWarningOptionForDiag(Info.getID());
+    if (!Opt.empty()) {
+      OS << (Started ? "," : " [")
+         << (Level == DiagnosticsEngine::Remark ? "-R" : "-W") << Opt;
+      StringRef OptValue = Info.getDiags()->getFlagValue();
+      if (!OptValue.empty())
+        OS << "=" << OptValue;
+      Started = true;
+    }
+  }
+
+  // If the user wants to see category information, include it too.
+  if (DiagOpts.ShowCategories) {
+    unsigned DiagCategory =
+      DiagnosticIDs::getCategoryNumberForDiag(Info.getID());
+    if (DiagCategory) {
+      OS << (Started ? "," : " [");
+      Started = true;
+      if (DiagOpts.ShowCategories == 1)
+        OS << DiagCategory;
+      else {
+        assert(DiagOpts.ShowCategories == 2 && "Invalid ShowCategories value");
+        OS << DiagnosticIDs::getCategoryNameFromID(DiagCategory);
+      }
+    }
+  }
+  if (Started)
+    OS << ']';
+}
+
+void TextDiagnosticPrinter::HandleDiagnostic(DiagnosticsEngine::Level Level,
+                                             const Diagnostic &Info) {
+  // Default implementation (Warnings/errors count).
+  DiagnosticConsumer::HandleDiagnostic(Level, Info);
+
+  // Render the diagnostic message into a temporary buffer eagerly. We'll use
+  // this later as we print out the diagnostic to the terminal.
+  SmallString<100> OutStr;
+  Info.FormatDiagnostic(OutStr);
+
+  llvm::raw_svector_ostream DiagMessageStream(OutStr);
+  printDiagnosticOptions(DiagMessageStream, Level, Info, *DiagOpts);
+
+  // Keeps track of the starting position of the location
+  // information (e.g., "foo.c:10:4:") that precedes the error
+  // message. We use this information to determine how long the
+  // file+line+column number prefix is.
+  uint64_t StartOfLocationInfo = OS.tell();
+
+  if (!Prefix.empty())
+    OS << Prefix << ": ";
+
+  // Use a dedicated, simpler path for diagnostics without a valid location.
+  // This is important as if the location is missing, we may be emitting
+  // diagnostics in a context that lacks language options, a source manager, or
+  // other infrastructure necessary when emitting more rich diagnostics.
+  if (!Info.getLocation().isValid()) {
+    TextDiagnostic::printDiagnosticLevel(OS, Level, DiagOpts->ShowColors);
+    TextDiagnostic::printDiagnosticMessage(
+        OS, /*IsSupplemental=*/Level == DiagnosticsEngine::Note,
+        DiagMessageStream.str(), OS.tell() - StartOfLocationInfo,
+        DiagOpts->MessageLength, DiagOpts->ShowColors);
+    OS.flush();
+    return;
+  }
+
+  // Assert that the rest of our infrastructure is setup properly.
+  assert(DiagOpts && "Unexpected diagnostic without options set");
+  assert(Info.hasSourceManager() &&
+         "Unexpected diagnostic with no source manager");
+  assert(TextDiag && "Unexpected diagnostic outside source file processing");
+
+  TextDiag->emitDiagnostic(
+      FullSourceLoc(Info.getLocation(), Info.getSourceManager()), Level,
+      DiagMessageStream.str(), Info.getRanges(), Info.getFixItHints());
+
+  OS.flush();
+}
diff --git a/contrib/libs/clang14/lib/Frontend/VerifyDiagnosticConsumer.cpp b/contrib/libs/clang14/lib/Frontend/VerifyDiagnosticConsumer.cpp
new file mode 100644
index 0000000000..f67dceea91
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/VerifyDiagnosticConsumer.cpp
@@ -0,0 +1,1166 @@
+//===- VerifyDiagnosticConsumer.cpp - Verifying Diagnostic Client ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a concrete diagnostic client, which buffers the diagnostic messages.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/VerifyDiagnosticConsumer.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/Diagnostic.h"
+#include "clang/Basic/DiagnosticOptions.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Basic/TokenKinds.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Frontend/TextDiagnosticBuffer.h"
+#include "clang/Lex/HeaderSearch.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/Token.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Regex.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+#include <iterator>
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+using namespace clang;
+
+using Directive = VerifyDiagnosticConsumer::Directive;
+using DirectiveList = VerifyDiagnosticConsumer::DirectiveList;
+using ExpectedData = VerifyDiagnosticConsumer::ExpectedData;
+
+#ifndef NDEBUG
+
+namespace {
+
+class VerifyFileTracker : public PPCallbacks {
+  VerifyDiagnosticConsumer &Verify;
+  SourceManager &SM;
+
+public:
+  VerifyFileTracker(VerifyDiagnosticConsumer &Verify, SourceManager &SM)
+      : Verify(Verify), SM(SM) {}
+
+  /// Hook into the preprocessor and update the list of parsed
+  /// files when the preprocessor indicates a new file is entered.
+  void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                   SrcMgr::CharacteristicKind FileType,
+                   FileID PrevFID) override {
+    Verify.UpdateParsedFileStatus(SM, SM.getFileID(Loc),
+                                  VerifyDiagnosticConsumer::IsParsed);
+  }
+};
+
+} // namespace
+
+#endif
+
+//===----------------------------------------------------------------------===//
+// Checking diagnostics implementation.
+//===----------------------------------------------------------------------===//
+
+using DiagList = TextDiagnosticBuffer::DiagList;
+using const_diag_iterator = TextDiagnosticBuffer::const_iterator;
+
+namespace {
+
+/// StandardDirective - Directive with string matching.
+class StandardDirective : public Directive {
+public:
+  StandardDirective(SourceLocation DirectiveLoc, SourceLocation DiagnosticLoc,
+                    bool MatchAnyFileAndLine, bool MatchAnyLine, StringRef Text,
+                    unsigned Min, unsigned Max)
+      : Directive(DirectiveLoc, DiagnosticLoc, MatchAnyFileAndLine,
+                  MatchAnyLine, Text, Min, Max) {}
+
+  bool isValid(std::string &Error) override {
+    // all strings are considered valid; even empty ones
+    return true;
+  }
+
+  bool match(StringRef S) override { return S.contains(Text); }
+};
+
+/// RegexDirective - Directive with regular-expression matching.
+class RegexDirective : public Directive {
+public:
+  RegexDirective(SourceLocation DirectiveLoc, SourceLocation DiagnosticLoc,
+                 bool MatchAnyFileAndLine, bool MatchAnyLine, StringRef Text,
+                 unsigned Min, unsigned Max, StringRef RegexStr)
+      : Directive(DirectiveLoc, DiagnosticLoc, MatchAnyFileAndLine,
+                  MatchAnyLine, Text, Min, Max),
+        Regex(RegexStr) {}
+
+  bool isValid(std::string &Error) override {
+    return Regex.isValid(Error);
+  }
+
+  bool match(StringRef S) override {
+    return Regex.match(S);
+  }
+
+private:
+  llvm::Regex Regex;
+};
+
+class ParseHelper
+{
+public:
+  ParseHelper(StringRef S)
+      : Begin(S.begin()), End(S.end()), C(Begin), P(Begin) {}
+
+  // Return true if string literal is next.
+  bool Next(StringRef S) {
+    P = C;
+    PEnd = C + S.size();
+    if (PEnd > End)
+      return false;
+    return memcmp(P, S.data(), S.size()) == 0;
+  }
+
+  // Return true if number is next.
+  // Output N only if number is next.
+  bool Next(unsigned &N) {
+    unsigned TMP = 0;
+    P = C;
+    PEnd = P;
+    for (; PEnd < End && *PEnd >= '0' && *PEnd <= '9'; ++PEnd) {
+      TMP *= 10;
+      TMP += *PEnd - '0';
+    }
+    if (PEnd == C)
+      return false;
+    N = TMP;
+    return true;
+  }
+
+  // Return true if a marker is next.
+  // A marker is the longest match for /#[A-Za-z0-9_-]+/.
+  bool NextMarker() {
+    P = C;
+    if (P == End || *P != '#')
+      return false;
+    PEnd = P;
+    ++PEnd;
+    while ((isAlphanumeric(*PEnd) || *PEnd == '-' || *PEnd == '_') &&
+           PEnd < End)
+      ++PEnd;
+    return PEnd > P + 1;
+  }
+
+  // Return true if string literal S is matched in content.
+  // When true, P marks begin-position of the match, and calling Advance sets C
+  // to end-position of the match.
+  // If S is the empty string, then search for any letter instead (makes sense
+  // with FinishDirectiveToken=true).
+  // If EnsureStartOfWord, then skip matches that don't start a new word.
+  // If FinishDirectiveToken, then assume the match is the start of a comment
+  // directive for -verify, and extend the match to include the entire first
+  // token of that directive.
+  bool Search(StringRef S, bool EnsureStartOfWord = false,
+              bool FinishDirectiveToken = false) {
+    do {
+      if (!S.empty()) {
+        P = std::search(C, End, S.begin(), S.end());
+        PEnd = P + S.size();
+      }
+      else {
+        P = C;
+        while (P != End && !isLetter(*P))
+          ++P;
+        PEnd = P + 1;
+      }
+      if (P == End)
+        break;
+      // If not start of word but required, skip and search again.
+      if (EnsureStartOfWord
+               // Check if string literal starts a new word.
+          && !(P == Begin || isWhitespace(P[-1])
+               // Or it could be preceded by the start of a comment.
+               || (P > (Begin + 1) && (P[-1] == '/' || P[-1] == '*')
+                                   &&  P[-2] == '/')))
+        continue;
+      if (FinishDirectiveToken) {
+        while (PEnd != End && (isAlphanumeric(*PEnd)
+                               || *PEnd == '-' || *PEnd == '_'))
+          ++PEnd;
+        // Put back trailing digits and hyphens to be parsed later as a count
+        // or count range.  Because -verify prefixes must start with letters,
+        // we know the actual directive we found starts with a letter, so
+        // we won't put back the entire directive word and thus record an empty
+        // string.
+        assert(isLetter(*P) && "-verify prefix must start with a letter");
+        while (isDigit(PEnd[-1]) || PEnd[-1] == '-')
+          --PEnd;
+      }
+      return true;
+    } while (Advance());
+    return false;
+  }
+
+  // Return true if a CloseBrace that closes the OpenBrace at the current nest
+  // level is found. When true, P marks begin-position of CloseBrace.
+  bool SearchClosingBrace(StringRef OpenBrace, StringRef CloseBrace) {
+    unsigned Depth = 1;
+    P = C;
+    while (P < End) {
+      StringRef S(P, End - P);
+      if (S.startswith(OpenBrace)) {
+        ++Depth;
+        P += OpenBrace.size();
+      } else if (S.startswith(CloseBrace)) {
+        --Depth;
+        if (Depth == 0) {
+          PEnd = P + CloseBrace.size();
+          return true;
+        }
+        P += CloseBrace.size();
+      } else {
+        ++P;
+      }
+    }
+    return false;
+  }
+
+  // Advance 1-past previous next/search.
+  // Behavior is undefined if previous next/search failed.
+  bool Advance() {
+    C = PEnd;
+    return C < End;
+  }
+
+  // Return the text matched by the previous next/search.
+  // Behavior is undefined if previous next/search failed.
+  StringRef Match() { return StringRef(P, PEnd - P); }
+
+  // Skip zero or more whitespace.
+  void SkipWhitespace() {
+    for (; C < End && isWhitespace(*C); ++C)
+      ;
+  }
+
+  // Return true if EOF reached.
+  bool Done() {
+    return !(C < End);
+  }
+
+  // Beginning of expected content.
+  const char * const Begin;
+
+  // End of expected content (1-past).
+  const char * const End;
+
+  // Position of next char in content.
+  const char *C;
+
+  // Previous next/search subject start.
+  const char *P;
+
+private:
+  // Previous next/search subject end (1-past).
+  const char *PEnd = nullptr;
+};
+
+// The information necessary to create a directive.
+struct UnattachedDirective {
+  DirectiveList *DL = nullptr;
+  bool RegexKind = false;
+  SourceLocation DirectivePos, ContentBegin;
+  std::string Text;
+  unsigned Min = 1, Max = 1;
+};
+
+// Attach the specified directive to the line of code indicated by
+// \p ExpectedLoc.
+void attachDirective(DiagnosticsEngine &Diags, const UnattachedDirective &UD,
+                     SourceLocation ExpectedLoc,
+                     bool MatchAnyFileAndLine = false,
+                     bool MatchAnyLine = false) {
+  // Construct new directive.
+  std::unique_ptr<Directive> D = Directive::create(
+      UD.RegexKind, UD.DirectivePos, ExpectedLoc, MatchAnyFileAndLine,
+      MatchAnyLine, UD.Text, UD.Min, UD.Max);
+
+  std::string Error;
+  if (!D->isValid(Error)) {
+    Diags.Report(UD.ContentBegin, diag::err_verify_invalid_content)
+      << (UD.RegexKind ? "regex" : "string") << Error;
+  }
+
+  UD.DL->push_back(std::move(D));
+}
+
+} // anonymous
+
+// Tracker for markers in the input files. A marker is a comment of the form
+//
+//   n = 123; // #123
+//
+// ... that can be referred to by a later expected-* directive:
+//
+//   // expected-error@#123 {{undeclared identifier 'n'}}
+//
+// Marker declarations must be at the start of a comment or preceded by
+// whitespace to distinguish them from uses of markers in directives.
+class VerifyDiagnosticConsumer::MarkerTracker {
+  DiagnosticsEngine &Diags;
+
+  struct Marker {
+    SourceLocation DefLoc;
+    SourceLocation RedefLoc;
+    SourceLocation UseLoc;
+  };
+  llvm::StringMap<Marker> Markers;
+
+  // Directives that couldn't be created yet because they name an unknown
+  // marker.
+  llvm::StringMap<llvm::SmallVector<UnattachedDirective, 2>> DeferredDirectives;
+
+public:
+  MarkerTracker(DiagnosticsEngine &Diags) : Diags(Diags) {}
+
+  // Register a marker.
+  void addMarker(StringRef MarkerName, SourceLocation Pos) {
+    auto InsertResult = Markers.insert(
+        {MarkerName, Marker{Pos, SourceLocation(), SourceLocation()}});
+
+    Marker &M = InsertResult.first->second;
+    if (!InsertResult.second) {
+      // Marker was redefined.
+      M.RedefLoc = Pos;
+    } else {
+      // First definition: build any deferred directives.
+      auto Deferred = DeferredDirectives.find(MarkerName);
+      if (Deferred != DeferredDirectives.end()) {
+        for (auto &UD : Deferred->second) {
+          if (M.UseLoc.isInvalid())
+            M.UseLoc = UD.DirectivePos;
+          attachDirective(Diags, UD, Pos);
+        }
+        DeferredDirectives.erase(Deferred);
+      }
+    }
+  }
+
+  // Register a directive at the specified marker.
+  void addDirective(StringRef MarkerName, const UnattachedDirective &UD) {
+    auto MarkerIt = Markers.find(MarkerName);
+    if (MarkerIt != Markers.end()) {
+      Marker &M = MarkerIt->second;
+      if (M.UseLoc.isInvalid())
+        M.UseLoc = UD.DirectivePos;
+      return attachDirective(Diags, UD, M.DefLoc);
+    }
+    DeferredDirectives[MarkerName].push_back(UD);
+  }
+
+  // Ensure we have no remaining deferred directives, and no
+  // multiply-defined-and-used markers.
+  void finalize() {
+    for (auto &MarkerInfo : Markers) {
+      StringRef Name = MarkerInfo.first();
+      Marker &M = MarkerInfo.second;
+      if (M.RedefLoc.isValid() && M.UseLoc.isValid()) {
+        Diags.Report(M.UseLoc, diag::err_verify_ambiguous_marker) << Name;
+        Diags.Report(M.DefLoc, diag::note_verify_ambiguous_marker) << Name;
+        Diags.Report(M.RedefLoc, diag::note_verify_ambiguous_marker) << Name;
+      }
+    }
+
+    for (auto &DeferredPair : DeferredDirectives) {
+      Diags.Report(DeferredPair.second.front().DirectivePos,
+                   diag::err_verify_no_such_marker)
+          << DeferredPair.first();
+    }
+  }
+};
+
+/// ParseDirective - Go through the comment and see if it indicates expected
+/// diagnostics. If so, then put them in the appropriate directive list.
+///
+/// Returns true if any valid directives were found.
+static bool ParseDirective(StringRef S, ExpectedData *ED, SourceManager &SM,
+                           Preprocessor *PP, SourceLocation Pos,
+                           VerifyDiagnosticConsumer::DirectiveStatus &Status,
+                           VerifyDiagnosticConsumer::MarkerTracker &Markers) {
+  DiagnosticsEngine &Diags = PP ? PP->getDiagnostics() : SM.getDiagnostics();
+
+  // First, scan the comment looking for markers.
+  for (ParseHelper PH(S); !PH.Done();) {
+    if (!PH.Search("#", true))
+      break;
+    PH.C = PH.P;
+    if (!PH.NextMarker()) {
+      PH.Next("#");
+      PH.Advance();
+      continue;
+    }
+    PH.Advance();
+    Markers.addMarker(PH.Match(), Pos);
+  }
+
+  // A single comment may contain multiple directives.
+  bool FoundDirective = false;
+  for (ParseHelper PH(S); !PH.Done();) {
+    // Search for the initial directive token.
+    // If one prefix, save time by searching only for its directives.
+    // Otherwise, search for any potential directive token and check it later.
+    const auto &Prefixes = Diags.getDiagnosticOptions().VerifyPrefixes;
+    if (!(Prefixes.size() == 1 ? PH.Search(*Prefixes.begin(), true, true)
+                               : PH.Search("", true, true)))
+      break;
+
+    StringRef DToken = PH.Match();
+    PH.Advance();
+
+    // Default directive kind.
+    UnattachedDirective D;
+    const char *KindStr = "string";
+
+    // Parse the initial directive token in reverse so we can easily determine
+    // its exact actual prefix.  If we were to parse it from the front instead,
+    // it would be harder to determine where the prefix ends because there
+    // might be multiple matching -verify prefixes because some might prefix
+    // others.
+
+    // Regex in initial directive token: -re
+    if (DToken.endswith("-re")) {
+      D.RegexKind = true;
+      KindStr = "regex";
+      DToken = DToken.substr(0, DToken.size()-3);
+    }
+
+    // Type in initial directive token: -{error|warning|note|no-diagnostics}
+    bool NoDiag = false;
+    StringRef DType;
+    if (DToken.endswith(DType="-error"))
+      D.DL = ED ? &ED->Errors : nullptr;
+    else if (DToken.endswith(DType="-warning"))
+      D.DL = ED ? &ED->Warnings : nullptr;
+    else if (DToken.endswith(DType="-remark"))
+      D.DL = ED ? &ED->Remarks : nullptr;
+    else if (DToken.endswith(DType="-note"))
+      D.DL = ED ? &ED->Notes : nullptr;
+    else if (DToken.endswith(DType="-no-diagnostics")) {
+      NoDiag = true;
+      if (D.RegexKind)
+        continue;
+    }
+    else
+      continue;
+    DToken = DToken.substr(0, DToken.size()-DType.size());
+
+    // What's left in DToken is the actual prefix.  That might not be a -verify
+    // prefix even if there is only one -verify prefix (for example, the full
+    // DToken is foo-bar-warning, but foo is the only -verify prefix).
+    if (!std::binary_search(Prefixes.begin(), Prefixes.end(), DToken))
+      continue;
+
+    if (NoDiag) {
+      if (Status == VerifyDiagnosticConsumer::HasOtherExpectedDirectives)
+        Diags.Report(Pos, diag::err_verify_invalid_no_diags)
+          << /*IsExpectedNoDiagnostics=*/true;
+      else
+        Status = VerifyDiagnosticConsumer::HasExpectedNoDiagnostics;
+      continue;
+    }
+    if (Status == VerifyDiagnosticConsumer::HasExpectedNoDiagnostics) {
+      Diags.Report(Pos, diag::err_verify_invalid_no_diags)
+        << /*IsExpectedNoDiagnostics=*/false;
+      continue;
+    }
+    Status = VerifyDiagnosticConsumer::HasOtherExpectedDirectives;
+
+    // If a directive has been found but we're not interested
+    // in storing the directive information, return now.
+    if (!D.DL)
+      return true;
+
+    // Next optional token: @
+    SourceLocation ExpectedLoc;
+    StringRef Marker;
+    bool MatchAnyFileAndLine = false;
+    bool MatchAnyLine = false;
+    if (!PH.Next("@")) {
+      ExpectedLoc = Pos;
+    } else {
+      PH.Advance();
+      unsigned Line = 0;
+      bool FoundPlus = PH.Next("+");
+      if (FoundPlus || PH.Next("-")) {
+        // Relative to current line.
+        PH.Advance();
+        bool Invalid = false;
+        unsigned ExpectedLine = SM.getSpellingLineNumber(Pos, &Invalid);
+        if (!Invalid && PH.Next(Line) && (FoundPlus || Line < ExpectedLine)) {
+          if (FoundPlus) ExpectedLine += Line;
+          else ExpectedLine -= Line;
+          ExpectedLoc = SM.translateLineCol(SM.getFileID(Pos), ExpectedLine, 1);
+        }
+      } else if (PH.Next(Line)) {
+        // Absolute line number.
+        if (Line > 0)
+          ExpectedLoc = SM.translateLineCol(SM.getFileID(Pos), Line, 1);
+      } else if (PH.NextMarker()) {
+        Marker = PH.Match();
+      } else if (PP && PH.Search(":")) {
+        // Specific source file.
+        StringRef Filename(PH.C, PH.P-PH.C);
+        PH.Advance();
+
+        if (Filename == "*") {
+          MatchAnyFileAndLine = true;
+          if (!PH.Next("*")) {
+            Diags.Report(Pos.getLocWithOffset(PH.C - PH.Begin),
+                         diag::err_verify_missing_line)
+                << "'*'";
+            continue;
+          }
+          MatchAnyLine = true;
+          ExpectedLoc = SourceLocation();
+        } else {
+          // Lookup file via Preprocessor, like a #include.
+          Optional<FileEntryRef> File =
+              PP->LookupFile(Pos, Filename, false, nullptr, nullptr, nullptr,
+                             nullptr, nullptr, nullptr, nullptr, nullptr);
+          if (!File) {
+            Diags.Report(Pos.getLocWithOffset(PH.C - PH.Begin),
+                         diag::err_verify_missing_file)
+                << Filename << KindStr;
+            continue;
+          }
+
+          FileID FID = SM.translateFile(*File);
+          if (FID.isInvalid())
+            FID = SM.createFileID(*File, Pos, SrcMgr::C_User);
+
+          if (PH.Next(Line) && Line > 0)
+            ExpectedLoc = SM.translateLineCol(FID, Line, 1);
+          else if (PH.Next("*")) {
+            MatchAnyLine = true;
+            ExpectedLoc = SM.translateLineCol(FID, 1, 1);
+          }
+        }
+      } else if (PH.Next("*")) {
+        MatchAnyLine = true;
+        ExpectedLoc = SourceLocation();
+      }
+
+      if (ExpectedLoc.isInvalid() && !MatchAnyLine && Marker.empty()) {
+        Diags.Report(Pos.getLocWithOffset(PH.C-PH.Begin),
+                     diag::err_verify_missing_line) << KindStr;
+        continue;
+      }
+      PH.Advance();
+    }
+
+    // Skip optional whitespace.
+    PH.SkipWhitespace();
+
+    // Next optional token: positive integer or a '+'.
+    if (PH.Next(D.Min)) {
+      PH.Advance();
+      // A positive integer can be followed by a '+' meaning min
+      // or more, or by a '-' meaning a range from min to max.
+      if (PH.Next("+")) {
+        D.Max = Directive::MaxCount;
+        PH.Advance();
+      } else if (PH.Next("-")) {
+        PH.Advance();
+        if (!PH.Next(D.Max) || D.Max < D.Min) {
+          Diags.Report(Pos.getLocWithOffset(PH.C-PH.Begin),
+                       diag::err_verify_invalid_range) << KindStr;
+          continue;
+        }
+        PH.Advance();
+      } else {
+        D.Max = D.Min;
+      }
+    } else if (PH.Next("+")) {
+      // '+' on its own means "1 or more".
+      D.Max = Directive::MaxCount;
+      PH.Advance();
+    }
+
+    // Skip optional whitespace.
+    PH.SkipWhitespace();
+
+    // Next token: {{
+    if (!PH.Next("{{")) {
+      Diags.Report(Pos.getLocWithOffset(PH.C-PH.Begin),
+                   diag::err_verify_missing_start) << KindStr;
+      continue;
+    }
+    PH.Advance();
+    const char* const ContentBegin = PH.C; // mark content begin
+    // Search for token: }}
+    if (!PH.SearchClosingBrace("{{", "}}")) {
+      Diags.Report(Pos.getLocWithOffset(PH.C-PH.Begin),
+                   diag::err_verify_missing_end) << KindStr;
+      continue;
+    }
+    const char* const ContentEnd = PH.P; // mark content end
+    PH.Advance();
+
+    D.DirectivePos = Pos;
+    D.ContentBegin = Pos.getLocWithOffset(ContentBegin - PH.Begin);
+
+    // Build directive text; convert \n to newlines.
+    StringRef NewlineStr = "\\n";
+    StringRef Content(ContentBegin, ContentEnd-ContentBegin);
+    size_t CPos = 0;
+    size_t FPos;
+    while ((FPos = Content.find(NewlineStr, CPos)) != StringRef::npos) {
+      D.Text += Content.substr(CPos, FPos-CPos);
+      D.Text += '\n';
+      CPos = FPos + NewlineStr.size();
+    }
+    if (D.Text.empty())
+      D.Text.assign(ContentBegin, ContentEnd);
+
+    // Check that regex directives contain at least one regex.
+    if (D.RegexKind && D.Text.find("{{") == StringRef::npos) {
+      Diags.Report(D.ContentBegin, diag::err_verify_missing_regex) << D.Text;
+      return false;
+    }
+
+    if (Marker.empty())
+      attachDirective(Diags, D, ExpectedLoc, MatchAnyFileAndLine, MatchAnyLine);
+    else
+      Markers.addDirective(Marker, D);
+    FoundDirective = true;
+  }
+
+  return FoundDirective;
+}
+
+VerifyDiagnosticConsumer::VerifyDiagnosticConsumer(DiagnosticsEngine &Diags_)
+    : Diags(Diags_), PrimaryClient(Diags.getClient()),
+      PrimaryClientOwner(Diags.takeClient()),
+      Buffer(new TextDiagnosticBuffer()), Markers(new MarkerTracker(Diags)),
+      Status(HasNoDirectives) {
+  if (Diags.hasSourceManager())
+    setSourceManager(Diags.getSourceManager());
+}
+
+VerifyDiagnosticConsumer::~VerifyDiagnosticConsumer() {
+  assert(!ActiveSourceFiles && "Incomplete parsing of source files!");
+  assert(!CurrentPreprocessor && "CurrentPreprocessor should be invalid!");
+  SrcManager = nullptr;
+  CheckDiagnostics();
+  assert(!Diags.ownsClient() &&
+         "The VerifyDiagnosticConsumer takes over ownership of the client!");
+}
+
+// DiagnosticConsumer interface.
+
+void VerifyDiagnosticConsumer::BeginSourceFile(const LangOptions &LangOpts,
+                                               const Preprocessor *PP) {
+  // Attach comment handler on first invocation.
+  if (++ActiveSourceFiles == 1) {
+    if (PP) {
+      CurrentPreprocessor = PP;
+      this->LangOpts = &LangOpts;
+      setSourceManager(PP->getSourceManager());
+      const_cast<Preprocessor *>(PP)->addCommentHandler(this);
+#ifndef NDEBUG
+      // Debug build tracks parsed files.
+      const_cast<Preprocessor *>(PP)->addPPCallbacks(
+                      std::make_unique<VerifyFileTracker>(*this, *SrcManager));
+#endif
+    }
+  }
+
+  assert((!PP || CurrentPreprocessor == PP) && "Preprocessor changed!");
+  PrimaryClient->BeginSourceFile(LangOpts, PP);
+}
+
+void VerifyDiagnosticConsumer::EndSourceFile() {
+  assert(ActiveSourceFiles && "No active source files!");
+  PrimaryClient->EndSourceFile();
+
+  // Detach comment handler once last active source file completed.
+  if (--ActiveSourceFiles == 0) {
+    if (CurrentPreprocessor)
+      const_cast<Preprocessor *>(CurrentPreprocessor)->
+          removeCommentHandler(this);
+
+    // Diagnose any used-but-not-defined markers.
+    Markers->finalize();
+
+    // Check diagnostics once last file completed.
+    CheckDiagnostics();
+    CurrentPreprocessor = nullptr;
+    LangOpts = nullptr;
+  }
+}
+
+void VerifyDiagnosticConsumer::HandleDiagnostic(
+      DiagnosticsEngine::Level DiagLevel, const Diagnostic &Info) {
+  if (Info.hasSourceManager()) {
+    // If this diagnostic is for a different source manager, ignore it.
+    if (SrcManager && &Info.getSourceManager() != SrcManager)
+      return;
+
+    setSourceManager(Info.getSourceManager());
+  }
+
+#ifndef NDEBUG
+  // Debug build tracks unparsed files for possible
+  // unparsed expected-* directives.
+  if (SrcManager) {
+    SourceLocation Loc = Info.getLocation();
+    if (Loc.isValid()) {
+      ParsedStatus PS = IsUnparsed;
+
+      Loc = SrcManager->getExpansionLoc(Loc);
+      FileID FID = SrcManager->getFileID(Loc);
+
+      const FileEntry *FE = SrcManager->getFileEntryForID(FID);
+      if (FE && CurrentPreprocessor && SrcManager->isLoadedFileID(FID)) {
+        // If the file is a modules header file it shall not be parsed
+        // for expected-* directives.
+        HeaderSearch &HS = CurrentPreprocessor->getHeaderSearchInfo();
+        if (HS.findModuleForHeader(FE))
+          PS = IsUnparsedNoDirectives;
+      }
+
+      UpdateParsedFileStatus(*SrcManager, FID, PS);
+    }
+  }
+#endif
+
+  // Send the diagnostic to the buffer, we will check it once we reach the end
+  // of the source file (or are destructed).
+  Buffer->HandleDiagnostic(DiagLevel, Info);
+}
+
+/// HandleComment - Hook into the preprocessor and extract comments containing
+///  expected errors and warnings.
+bool VerifyDiagnosticConsumer::HandleComment(Preprocessor &PP,
+                                             SourceRange Comment) {
+  SourceManager &SM = PP.getSourceManager();
+
+  // If this comment is for a different source manager, ignore it.
+  if (SrcManager && &SM != SrcManager)
+    return false;
+
+  SourceLocation CommentBegin = Comment.getBegin();
+
+  const char *CommentRaw = SM.getCharacterData(CommentBegin);
+  StringRef C(CommentRaw, SM.getCharacterData(Comment.getEnd()) - CommentRaw);
+
+  if (C.empty())
+    return false;
+
+  // Fold any "\<EOL>" sequences
+  size_t loc = C.find('\\');
+  if (loc == StringRef::npos) {
+    ParseDirective(C, &ED, SM, &PP, CommentBegin, Status, *Markers);
+    return false;
+  }
+
+  std::string C2;
+  C2.reserve(C.size());
+
+  for (size_t last = 0;; loc = C.find('\\', last)) {
+    if (loc == StringRef::npos || loc == C.size()) {
+      C2 += C.substr(last);
+      break;
+    }
+    C2 += C.substr(last, loc-last);
+    last = loc + 1;
+
+    if (C[last] == '\n' || C[last] == '\r') {
+      ++last;
+
+      // Escape \r\n  or \n\r, but not \n\n.
+      if (last < C.size())
+        if (C[last] == '\n' || C[last] == '\r')
+          if (C[last] != C[last-1])
+            ++last;
+    } else {
+      // This was just a normal backslash.
+      C2 += '\\';
+    }
+  }
+
+  if (!C2.empty())
+    ParseDirective(C2, &ED, SM, &PP, CommentBegin, Status, *Markers);
+  return false;
+}
+
+#ifndef NDEBUG
+/// Lex the specified source file to determine whether it contains
+/// any expected-* directives.  As a Lexer is used rather than a full-blown
+/// Preprocessor, directives inside skipped #if blocks will still be found.
+///
+/// \return true if any directives were found.
+static bool findDirectives(SourceManager &SM, FileID FID,
+                           const LangOptions &LangOpts) {
+  // Create a raw lexer to pull all the comments out of FID.
+  if (FID.isInvalid())
+    return false;
+
+  // Create a lexer to lex all the tokens of the main file in raw mode.
+  llvm::MemoryBufferRef FromFile = SM.getBufferOrFake(FID);
+  Lexer RawLex(FID, FromFile, SM, LangOpts);
+
+  // Return comments as tokens, this is how we find expected diagnostics.
+  RawLex.SetCommentRetentionState(true);
+
+  Token Tok;
+  Tok.setKind(tok::comment);
+  VerifyDiagnosticConsumer::DirectiveStatus Status =
+    VerifyDiagnosticConsumer::HasNoDirectives;
+  while (Tok.isNot(tok::eof)) {
+    RawLex.LexFromRawLexer(Tok);
+    if (!Tok.is(tok::comment)) continue;
+
+    std::string Comment = RawLex.getSpelling(Tok, SM, LangOpts);
+    if (Comment.empty()) continue;
+
+    // We don't care about tracking markers for this phase.
+    VerifyDiagnosticConsumer::MarkerTracker Markers(SM.getDiagnostics());
+
+    // Find first directive.
+    if (ParseDirective(Comment, nullptr, SM, nullptr, Tok.getLocation(),
+                       Status, Markers))
+      return true;
+  }
+  return false;
+}
+#endif // !NDEBUG
+
+/// Takes a list of diagnostics that have been generated but not matched
+/// by an expected-* directive and produces a diagnostic to the user from this.
+static unsigned PrintUnexpected(DiagnosticsEngine &Diags, SourceManager *SourceMgr,
+                                const_diag_iterator diag_begin,
+                                const_diag_iterator diag_end,
+                                const char *Kind) {
+  if (diag_begin == diag_end) return 0;
+
+  SmallString<256> Fmt;
+  llvm::raw_svector_ostream OS(Fmt);
+  for (const_diag_iterator I = diag_begin, E = diag_end; I != E; ++I) {
+    if (I->first.isInvalid() || !SourceMgr)
+      OS << "\n  (frontend)";
+    else {
+      OS << "\n ";
+      if (const FileEntry *File = SourceMgr->getFileEntryForID(
+                                                SourceMgr->getFileID(I->first)))
+        OS << " File " << File->getName();
+      OS << " Line " << SourceMgr->getPresumedLineNumber(I->first);
+    }
+    OS << ": " << I->second;
+  }
+
+  Diags.Report(diag::err_verify_inconsistent_diags).setForceEmit()
+    << Kind << /*Unexpected=*/true << OS.str();
+  return std::distance(diag_begin, diag_end);
+}
+
+/// Takes a list of diagnostics that were expected to have been generated
+/// but were not and produces a diagnostic to the user from this.
+static unsigned PrintExpected(DiagnosticsEngine &Diags,
+                              SourceManager &SourceMgr,
+                              std::vector<Directive *> &DL, const char *Kind) {
+  if (DL.empty())
+    return 0;
+
+  SmallString<256> Fmt;
+  llvm::raw_svector_ostream OS(Fmt);
+  for (const auto *D : DL) {
+    if (D->DiagnosticLoc.isInvalid() || D->MatchAnyFileAndLine)
+      OS << "\n  File *";
+    else
+      OS << "\n  File " << SourceMgr.getFilename(D->DiagnosticLoc);
+    if (D->MatchAnyLine)
+      OS << " Line *";
+    else
+      OS << " Line " << SourceMgr.getPresumedLineNumber(D->DiagnosticLoc);
+    if (D->DirectiveLoc != D->DiagnosticLoc)
+      OS << " (directive at "
+         << SourceMgr.getFilename(D->DirectiveLoc) << ':'
+         << SourceMgr.getPresumedLineNumber(D->DirectiveLoc) << ')';
+    OS << ": " << D->Text;
+  }
+
+  Diags.Report(diag::err_verify_inconsistent_diags).setForceEmit()
+    << Kind << /*Unexpected=*/false << OS.str();
+  return DL.size();
+}
+
+/// Determine whether two source locations come from the same file.
+static bool IsFromSameFile(SourceManager &SM, SourceLocation DirectiveLoc,
+                           SourceLocation DiagnosticLoc) {
+  while (DiagnosticLoc.isMacroID())
+    DiagnosticLoc = SM.getImmediateMacroCallerLoc(DiagnosticLoc);
+
+  if (SM.isWrittenInSameFile(DirectiveLoc, DiagnosticLoc))
+    return true;
+
+  const FileEntry *DiagFile = SM.getFileEntryForID(SM.getFileID(DiagnosticLoc));
+  if (!DiagFile && SM.isWrittenInMainFile(DirectiveLoc))
+    return true;
+
+  return (DiagFile == SM.getFileEntryForID(SM.getFileID(DirectiveLoc)));
+}
+
+/// CheckLists - Compare expected to seen diagnostic lists and return the
+/// the difference between them.
+static unsigned CheckLists(DiagnosticsEngine &Diags, SourceManager &SourceMgr,
+                           const char *Label,
+                           DirectiveList &Left,
+                           const_diag_iterator d2_begin,
+                           const_diag_iterator d2_end,
+                           bool IgnoreUnexpected) {
+  std::vector<Directive *> LeftOnly;
+  DiagList Right(d2_begin, d2_end);
+
+  for (auto &Owner : Left) {
+    Directive &D = *Owner;
+    unsigned LineNo1 = SourceMgr.getPresumedLineNumber(D.DiagnosticLoc);
+
+    for (unsigned i = 0; i < D.Max; ++i) {
+      DiagList::iterator II, IE;
+      for (II = Right.begin(), IE = Right.end(); II != IE; ++II) {
+        if (!D.MatchAnyLine) {
+          unsigned LineNo2 = SourceMgr.getPresumedLineNumber(II->first);
+          if (LineNo1 != LineNo2)
+            continue;
+        }
+
+        if (!D.DiagnosticLoc.isInvalid() && !D.MatchAnyFileAndLine &&
+            !IsFromSameFile(SourceMgr, D.DiagnosticLoc, II->first))
+          continue;
+
+        const std::string &RightText = II->second;
+        if (D.match(RightText))
+          break;
+      }
+      if (II == IE) {
+        // Not found.
+        if (i >= D.Min) break;
+        LeftOnly.push_back(&D);
+      } else {
+        // Found. The same cannot be found twice.
+        Right.erase(II);
+      }
+    }
+  }
+  // Now all that's left in Right are those that were not matched.
+  unsigned num = PrintExpected(Diags, SourceMgr, LeftOnly, Label);
+  if (!IgnoreUnexpected)
+    num += PrintUnexpected(Diags, &SourceMgr, Right.begin(), Right.end(), Label);
+  return num;
+}
+
+/// CheckResults - This compares the expected results to those that
+/// were actually reported. It emits any discrepencies. Return "true" if there
+/// were problems. Return "false" otherwise.
+static unsigned CheckResults(DiagnosticsEngine &Diags, SourceManager &SourceMgr,
+                             const TextDiagnosticBuffer &Buffer,
+                             ExpectedData &ED) {
+  // We want to capture the delta between what was expected and what was
+  // seen.
+  //
+  //   Expected \ Seen - set expected but not seen
+  //   Seen \ Expected - set seen but not expected
+  unsigned NumProblems = 0;
+
+  const DiagnosticLevelMask DiagMask =
+    Diags.getDiagnosticOptions().getVerifyIgnoreUnexpected();
+
+  // See if there are error mismatches.
+  NumProblems += CheckLists(Diags, SourceMgr, "error", ED.Errors,
+                            Buffer.err_begin(), Buffer.err_end(),
+                            bool(DiagnosticLevelMask::Error & DiagMask));
+
+  // See if there are warning mismatches.
+  NumProblems += CheckLists(Diags, SourceMgr, "warning", ED.Warnings,
+                            Buffer.warn_begin(), Buffer.warn_end(),
+                            bool(DiagnosticLevelMask::Warning & DiagMask));
+
+  // See if there are remark mismatches.
+  NumProblems += CheckLists(Diags, SourceMgr, "remark", ED.Remarks,
+                            Buffer.remark_begin(), Buffer.remark_end(),
+                            bool(DiagnosticLevelMask::Remark & DiagMask));
+
+  // See if there are note mismatches.
+  NumProblems += CheckLists(Diags, SourceMgr, "note", ED.Notes,
+                            Buffer.note_begin(), Buffer.note_end(),
+                            bool(DiagnosticLevelMask::Note & DiagMask));
+
+  return NumProblems;
+}
+
+void VerifyDiagnosticConsumer::UpdateParsedFileStatus(SourceManager &SM,
+                                                      FileID FID,
+                                                      ParsedStatus PS) {
+  // Check SourceManager hasn't changed.
+  setSourceManager(SM);
+
+#ifndef NDEBUG
+  if (FID.isInvalid())
+    return;
+
+  const FileEntry *FE = SM.getFileEntryForID(FID);
+
+  if (PS == IsParsed) {
+    // Move the FileID from the unparsed set to the parsed set.
+    UnparsedFiles.erase(FID);
+    ParsedFiles.insert(std::make_pair(FID, FE));
+  } else if (!ParsedFiles.count(FID) && !UnparsedFiles.count(FID)) {
+    // Add the FileID to the unparsed set if we haven't seen it before.
+
+    // Check for directives.
+    bool FoundDirectives;
+    if (PS == IsUnparsedNoDirectives)
+      FoundDirectives = false;
+    else
+      FoundDirectives = !LangOpts || findDirectives(SM, FID, *LangOpts);
+
+    // Add the FileID to the unparsed set.
+    UnparsedFiles.insert(std::make_pair(FID,
+                                      UnparsedFileStatus(FE, FoundDirectives)));
+  }
+#endif
+}
+
+void VerifyDiagnosticConsumer::CheckDiagnostics() {
+  // Ensure any diagnostics go to the primary client.
+  DiagnosticConsumer *CurClient = Diags.getClient();
+  std::unique_ptr<DiagnosticConsumer> Owner = Diags.takeClient();
+  Diags.setClient(PrimaryClient, false);
+
+#ifndef NDEBUG
+  // In a debug build, scan through any files that may have been missed
+  // during parsing and issue a fatal error if directives are contained
+  // within these files.  If a fatal error occurs, this suggests that
+  // this file is being parsed separately from the main file, in which
+  // case consider moving the directives to the correct place, if this
+  // is applicable.
+  if (!UnparsedFiles.empty()) {
+    // Generate a cache of parsed FileEntry pointers for alias lookups.
+    llvm::SmallPtrSet<const FileEntry *, 8> ParsedFileCache;
+    for (const auto &I : ParsedFiles)
+      if (const FileEntry *FE = I.second)
+        ParsedFileCache.insert(FE);
+
+    // Iterate through list of unparsed files.
+    for (const auto &I : UnparsedFiles) {
+      const UnparsedFileStatus &Status = I.second;
+      const FileEntry *FE = Status.getFile();
+
+      // Skip files that have been parsed via an alias.
+      if (FE && ParsedFileCache.count(FE))
+        continue;
+
+      // Report a fatal error if this file contained directives.
+      if (Status.foundDirectives()) {
+        llvm::report_fatal_error(Twine("-verify directives found after rather"
+                                       " than during normal parsing of ",
+                                 StringRef(FE ? FE->getName() : "(unknown)")));
+      }
+    }
+
+    // UnparsedFiles has been processed now, so clear it.
+    UnparsedFiles.clear();
+  }
+#endif // !NDEBUG
+
+  if (SrcManager) {
+    // Produce an error if no expected-* directives could be found in the
+    // source file(s) processed.
+    if (Status == HasNoDirectives) {
+      Diags.Report(diag::err_verify_no_directives).setForceEmit();
+      ++NumErrors;
+      Status = HasNoDirectivesReported;
+    }
+
+    // Check that the expected diagnostics occurred.
+    NumErrors += CheckResults(Diags, *SrcManager, *Buffer, ED);
+  } else {
+    const DiagnosticLevelMask DiagMask =
+        ~Diags.getDiagnosticOptions().getVerifyIgnoreUnexpected();
+    if (bool(DiagnosticLevelMask::Error & DiagMask))
+      NumErrors += PrintUnexpected(Diags, nullptr, Buffer->err_begin(),
+                                   Buffer->err_end(), "error");
+    if (bool(DiagnosticLevelMask::Warning & DiagMask))
+      NumErrors += PrintUnexpected(Diags, nullptr, Buffer->warn_begin(),
+                                   Buffer->warn_end(), "warn");
+    if (bool(DiagnosticLevelMask::Remark & DiagMask))
+      NumErrors += PrintUnexpected(Diags, nullptr, Buffer->remark_begin(),
+                                   Buffer->remark_end(), "remark");
+    if (bool(DiagnosticLevelMask::Note & DiagMask))
+      NumErrors += PrintUnexpected(Diags, nullptr, Buffer->note_begin(),
+                                   Buffer->note_end(), "note");
+  }
+
+  Diags.setClient(CurClient, Owner.release() != nullptr);
+
+  // Reset the buffer, we have processed all the diagnostics in it.
+  Buffer.reset(new TextDiagnosticBuffer());
+  ED.Reset();
+}
+
+std::unique_ptr<Directive> Directive::create(bool RegexKind,
+                                             SourceLocation DirectiveLoc,
+                                             SourceLocation DiagnosticLoc,
+                                             bool MatchAnyFileAndLine,
+                                             bool MatchAnyLine, StringRef Text,
+                                             unsigned Min, unsigned Max) {
+  if (!RegexKind)
+    return std::make_unique<StandardDirective>(DirectiveLoc, DiagnosticLoc,
+                                               MatchAnyFileAndLine,
+                                               MatchAnyLine, Text, Min, Max);
+
+  // Parse the directive into a regular expression.
+  std::string RegexStr;
+  StringRef S = Text;
+  while (!S.empty()) {
+    if (S.startswith("{{")) {
+      S = S.drop_front(2);
+      size_t RegexMatchLength = S.find("}}");
+      assert(RegexMatchLength != StringRef::npos);
+      // Append the regex, enclosed in parentheses.
+      RegexStr += "(";
+      RegexStr.append(S.data(), RegexMatchLength);
+      RegexStr += ")";
+      S = S.drop_front(RegexMatchLength + 2);
+    } else {
+      size_t VerbatimMatchLength = S.find("{{");
+      if (VerbatimMatchLength == StringRef::npos)
+        VerbatimMatchLength = S.size();
+      // Escape and append the fixed string.
+      RegexStr += llvm::Regex::escape(S.substr(0, VerbatimMatchLength));
+      S = S.drop_front(VerbatimMatchLength);
+    }
+  }
+
+  return std::make_unique<RegexDirective>(DirectiveLoc, DiagnosticLoc,
+                                          MatchAnyFileAndLine, MatchAnyLine,
+                                          Text, Min, Max, RegexStr);
+}
diff --git a/contrib/libs/clang14/lib/Frontend/ya.make b/contrib/libs/clang14/lib/Frontend/ya.make
new file mode 100644
index 0000000000..34b9d30175
--- /dev/null
+++ b/contrib/libs/clang14/lib/Frontend/ya.make
@@ -0,0 +1,69 @@
+# Generated by devtools/yamaker.
+
+LIBRARY()
+
+LICENSE(Apache-2.0 WITH LLVM-exception)
+
+LICENSE_TEXTS(.yandex_meta/licenses.list.txt)
+
+PEERDIR(
+    contrib/libs/clang14
+    contrib/libs/clang14/include
+    contrib/libs/clang14/lib/AST
+    contrib/libs/clang14/lib/Basic
+    contrib/libs/clang14/lib/Driver
+    contrib/libs/clang14/lib/Edit
+    contrib/libs/clang14/lib/Lex
+    contrib/libs/clang14/lib/Parse
+    contrib/libs/clang14/lib/Sema
+    contrib/libs/clang14/lib/Serialization
+    contrib/libs/llvm14
+    contrib/libs/llvm14/lib/Bitstream/Reader
+    contrib/libs/llvm14/lib/Option
+    contrib/libs/llvm14/lib/ProfileData
+    contrib/libs/llvm14/lib/Support
+)
+
+ADDINCL(
+    contrib/libs/clang14/lib/Frontend
+)
+
+NO_COMPILER_WARNINGS()
+
+NO_UTIL()
+
+SRCS(
+    ASTConsumers.cpp
+    ASTMerge.cpp
+    ASTUnit.cpp
+    ChainedDiagnosticConsumer.cpp
+    ChainedIncludesSource.cpp
+    CompilerInstance.cpp
+    CompilerInvocation.cpp
+    CreateInvocationFromCommandLine.cpp
+    DependencyFile.cpp
+    DependencyGraph.cpp
+    DiagnosticRenderer.cpp
+    ExtractAPIConsumer.cpp
+    FrontendAction.cpp
+    FrontendActions.cpp
+    FrontendOptions.cpp
+    HeaderIncludeGen.cpp
+    InitPreprocessor.cpp
+    InterfaceStubFunctionsConsumer.cpp
+    LayoutOverrideSource.cpp
+    LogDiagnosticPrinter.cpp
+    ModuleDependencyCollector.cpp
+    MultiplexConsumer.cpp
+    PrecompiledPreamble.cpp
+    PrintPreprocessedOutput.cpp
+    SerializedDiagnosticPrinter.cpp
+    SerializedDiagnosticReader.cpp
+    TestModuleFileExtension.cpp
+    TextDiagnostic.cpp
+    TextDiagnosticBuffer.cpp
+    TextDiagnosticPrinter.cpp
+    VerifyDiagnosticConsumer.cpp
+)
+
+END()