YDB Import 588

1384556be6811c00a4098d426b8eda9be6d2a541

1 files changed, 0 insertions, 1467 deletions

diff --git a/contrib/libs/clang14/lib/Lex/Preprocessor.cpp b/contrib/libs/clang14/lib/Lex/Preprocessor.cpp
deleted file mode 100644
index 3c338a2b812..00000000000
--- a/contrib/libs/clang14/lib/Lex/Preprocessor.cpp
+++ /dev/null
@@ -1,1467 +0,0 @@
-//===- Preprocessor.cpp - C Language Family Preprocessor Implementation ---===//
-//
-// 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 Preprocessor interface.
-//
-//===----------------------------------------------------------------------===//
-//
-// Options to support:
-//   -H       - Print the name of each header file used.
-//   -d[DNI] - Dump various things.
-//   -fworking-directory - #line's with preprocessor's working dir.
-//   -fpreprocessed
-//   -dependency-file,-M,-MM,-MF,-MG,-MP,-MT,-MQ,-MD,-MMD
-//   -W*
-//   -w
-//
-// Messages to emit:
-//   "Multiple include guards may be useful for:\n"
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/Lex/Preprocessor.h"
-#include "clang/Basic/Builtins.h"
-#include "clang/Basic/FileManager.h"
-#include "clang/Basic/FileSystemStatCache.h"
-#include "clang/Basic/IdentifierTable.h"
-#include "clang/Basic/LLVM.h"
-#include "clang/Basic/LangOptions.h"
-#include "clang/Basic/Module.h"
-#include "clang/Basic/SourceLocation.h"
-#include "clang/Basic/SourceManager.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Lex/CodeCompletionHandler.h"
-#include "clang/Lex/ExternalPreprocessorSource.h"
-#include "clang/Lex/HeaderSearch.h"
-#include "clang/Lex/LexDiagnostic.h"
-#include "clang/Lex/Lexer.h"
-#include "clang/Lex/LiteralSupport.h"
-#include "clang/Lex/MacroArgs.h"
-#include "clang/Lex/MacroInfo.h"
-#include "clang/Lex/ModuleLoader.h"
-#include "clang/Lex/Pragma.h"
-#include "clang/Lex/PreprocessingRecord.h"
-#include "clang/Lex/PreprocessorLexer.h"
-#include "clang/Lex/PreprocessorOptions.h"
-#include "clang/Lex/ScratchBuffer.h"
-#include "clang/Lex/Token.h"
-#include "clang/Lex/TokenLexer.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseMap.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/Support/Capacity.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-using namespace clang;
-
-LLVM_INSTANTIATE_REGISTRY(PragmaHandlerRegistry)
-
-ExternalPreprocessorSource::~ExternalPreprocessorSource() = default;
-
-Preprocessor::Preprocessor(std::shared_ptr<PreprocessorOptions> PPOpts,
-                           DiagnosticsEngine &diags, LangOptions &opts,
-                           SourceManager &SM, HeaderSearch &Headers,
-                           ModuleLoader &TheModuleLoader,
-                           IdentifierInfoLookup *IILookup, bool OwnsHeaders,
-                           TranslationUnitKind TUKind)
-    : PPOpts(std::move(PPOpts)), Diags(&diags), LangOpts(opts),
-      FileMgr(Headers.getFileMgr()), SourceMgr(SM),
-      ScratchBuf(new ScratchBuffer(SourceMgr)), HeaderInfo(Headers),
-      TheModuleLoader(TheModuleLoader), ExternalSource(nullptr),
-      // As the language options may have not been loaded yet (when
-      // deserializing an ASTUnit), adding keywords to the identifier table is
-      // deferred to Preprocessor::Initialize().
-      Identifiers(IILookup), PragmaHandlers(new PragmaNamespace(StringRef())),
-      TUKind(TUKind), SkipMainFilePreamble(0, true),
-      CurSubmoduleState(&NullSubmoduleState) {
-  OwnsHeaderSearch = OwnsHeaders;
-
-  // Default to discarding comments.
-  KeepComments = false;
-  KeepMacroComments = false;
-  SuppressIncludeNotFoundError = false;
-
-  // Macro expansion is enabled.
-  DisableMacroExpansion = false;
-  MacroExpansionInDirectivesOverride = false;
-  InMacroArgs = false;
-  ArgMacro = nullptr;
-  InMacroArgPreExpansion = false;
-  NumCachedTokenLexers = 0;
-  PragmasEnabled = true;
-  ParsingIfOrElifDirective = false;
-  PreprocessedOutput = false;
-
-  // We haven't read anything from the external source.
-  ReadMacrosFromExternalSource = false;
-
-  BuiltinInfo = std::make_unique<Builtin::Context>();
-
-  // "Poison" __VA_ARGS__, __VA_OPT__ which can only appear in the expansion of
-  // a macro. They get unpoisoned where it is allowed.
-  (Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned();
-  SetPoisonReason(Ident__VA_ARGS__,diag::ext_pp_bad_vaargs_use);
-  (Ident__VA_OPT__ = getIdentifierInfo("__VA_OPT__"))->setIsPoisoned();
-  SetPoisonReason(Ident__VA_OPT__,diag::ext_pp_bad_vaopt_use);
-
-  // Initialize the pragma handlers.
-  RegisterBuiltinPragmas();
-
-  // Initialize builtin macros like __LINE__ and friends.
-  RegisterBuiltinMacros();
-
-  if(LangOpts.Borland) {
-    Ident__exception_info        = getIdentifierInfo("_exception_info");
-    Ident___exception_info       = getIdentifierInfo("__exception_info");
-    Ident_GetExceptionInfo       = getIdentifierInfo("GetExceptionInformation");
-    Ident__exception_code        = getIdentifierInfo("_exception_code");
-    Ident___exception_code       = getIdentifierInfo("__exception_code");
-    Ident_GetExceptionCode       = getIdentifierInfo("GetExceptionCode");
-    Ident__abnormal_termination  = getIdentifierInfo("_abnormal_termination");
-    Ident___abnormal_termination = getIdentifierInfo("__abnormal_termination");
-    Ident_AbnormalTermination    = getIdentifierInfo("AbnormalTermination");
-  } else {
-    Ident__exception_info = Ident__exception_code = nullptr;
-    Ident__abnormal_termination = Ident___exception_info = nullptr;
-    Ident___exception_code = Ident___abnormal_termination = nullptr;
-    Ident_GetExceptionInfo = Ident_GetExceptionCode = nullptr;
-    Ident_AbnormalTermination = nullptr;
-  }
-
-  // If using a PCH where a #pragma hdrstop is expected, start skipping tokens.
-  if (usingPCHWithPragmaHdrStop())
-    SkippingUntilPragmaHdrStop = true;
-
-  // If using a PCH with a through header, start skipping tokens.
-  if (!this->PPOpts->PCHThroughHeader.empty() &&
-      !this->PPOpts->ImplicitPCHInclude.empty())
-    SkippingUntilPCHThroughHeader = true;
-
-  if (this->PPOpts->GeneratePreamble)
-    PreambleConditionalStack.startRecording();
-
-  ExcludedConditionalDirectiveSkipMappings =
-      this->PPOpts->ExcludedConditionalDirectiveSkipMappings;
-  if (ExcludedConditionalDirectiveSkipMappings)
-    ExcludedConditionalDirectiveSkipMappings->clear();
-
-  MaxTokens = LangOpts.MaxTokens;
-}
-
-Preprocessor::~Preprocessor() {
-  assert(BacktrackPositions.empty() && "EnableBacktrack/Backtrack imbalance!");
-
-  IncludeMacroStack.clear();
-
-  // Destroy any macro definitions.
-  while (MacroInfoChain *I = MIChainHead) {
-    MIChainHead = I->Next;
-    I->~MacroInfoChain();
-  }
-
-  // Free any cached macro expanders.
-  // This populates MacroArgCache, so all TokenLexers need to be destroyed
-  // before the code below that frees up the MacroArgCache list.
-  std::fill(TokenLexerCache, TokenLexerCache + NumCachedTokenLexers, nullptr);
-  CurTokenLexer.reset();
-
-  // Free any cached MacroArgs.
-  for (MacroArgs *ArgList = MacroArgCache; ArgList;)
-    ArgList = ArgList->deallocate();
-
-  // Delete the header search info, if we own it.
-  if (OwnsHeaderSearch)
-    delete &HeaderInfo;
-}
-
-void Preprocessor::Initialize(const TargetInfo &Target,
-                              const TargetInfo *AuxTarget) {
-  assert((!this->Target || this->Target == &Target) &&
-         "Invalid override of target information");
-  this->Target = &Target;
-
-  assert((!this->AuxTarget || this->AuxTarget == AuxTarget) &&
-         "Invalid override of aux target information.");
-  this->AuxTarget = AuxTarget;
-
-  // Initialize information about built-ins.
-  BuiltinInfo->InitializeTarget(Target, AuxTarget);
-  HeaderInfo.setTarget(Target);
-
-  // Populate the identifier table with info about keywords for the current language.
-  Identifiers.AddKeywords(LangOpts);
-}
-
-void Preprocessor::InitializeForModelFile() {
-  NumEnteredSourceFiles = 0;
-
-  // Reset pragmas
-  PragmaHandlersBackup = std::move(PragmaHandlers);
-  PragmaHandlers = std::make_unique<PragmaNamespace>(StringRef());
-  RegisterBuiltinPragmas();
-
-  // Reset PredefinesFileID
-  PredefinesFileID = FileID();
-}
-
-void Preprocessor::FinalizeForModelFile() {
-  NumEnteredSourceFiles = 1;
-
-  PragmaHandlers = std::move(PragmaHandlersBackup);
-}
-
-void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const {
-  llvm::errs() << tok::getTokenName(Tok.getKind()) << " '"
-               << getSpelling(Tok) << "'";
-
-  if (!DumpFlags) return;
-
-  llvm::errs() << "\t";
-  if (Tok.isAtStartOfLine())
-    llvm::errs() << " [StartOfLine]";
-  if (Tok.hasLeadingSpace())
-    llvm::errs() << " [LeadingSpace]";
-  if (Tok.isExpandDisabled())
-    llvm::errs() << " [ExpandDisabled]";
-  if (Tok.needsCleaning()) {
-    const char *Start = SourceMgr.getCharacterData(Tok.getLocation());
-    llvm::errs() << " [UnClean='" << StringRef(Start, Tok.getLength())
-                 << "']";
-  }
-
-  llvm::errs() << "\tLoc=<";
-  DumpLocation(Tok.getLocation());
-  llvm::errs() << ">";
-}
-
-void Preprocessor::DumpLocation(SourceLocation Loc) const {
-  Loc.print(llvm::errs(), SourceMgr);
-}
-
-void Preprocessor::DumpMacro(const MacroInfo &MI) const {
-  llvm::errs() << "MACRO: ";
-  for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) {
-    DumpToken(MI.getReplacementToken(i));
-    llvm::errs() << "  ";
-  }
-  llvm::errs() << "\n";
-}
-
-void Preprocessor::PrintStats() {
-  llvm::errs() << "\n*** Preprocessor Stats:\n";
-  llvm::errs() << NumDirectives << " directives found:\n";
-  llvm::errs() << "  " << NumDefined << " #define.\n";
-  llvm::errs() << "  " << NumUndefined << " #undef.\n";
-  llvm::errs() << "  #include/#include_next/#import:\n";
-  llvm::errs() << "    " << NumEnteredSourceFiles << " source files entered.\n";
-  llvm::errs() << "    " << MaxIncludeStackDepth << " max include stack depth\n";
-  llvm::errs() << "  " << NumIf << " #if/#ifndef/#ifdef.\n";
-  llvm::errs() << "  " << NumElse << " #else/#elif/#elifdef/#elifndef.\n";
-  llvm::errs() << "  " << NumEndif << " #endif.\n";
-  llvm::errs() << "  " << NumPragma << " #pragma.\n";
-  llvm::errs() << NumSkipped << " #if/#ifndef#ifdef regions skipped\n";
-
-  llvm::errs() << NumMacroExpanded << "/" << NumFnMacroExpanded << "/"
-             << NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, "
-             << NumFastMacroExpanded << " on the fast path.\n";
-  llvm::errs() << (NumFastTokenPaste+NumTokenPaste)
-             << " token paste (##) operations performed, "
-             << NumFastTokenPaste << " on the fast path.\n";
-
-  llvm::errs() << "\nPreprocessor Memory: " << getTotalMemory() << "B total";
-
-  llvm::errs() << "\n  BumpPtr: " << BP.getTotalMemory();
-  llvm::errs() << "\n  Macro Expanded Tokens: "
-               << llvm::capacity_in_bytes(MacroExpandedTokens);
-  llvm::errs() << "\n  Predefines Buffer: " << Predefines.capacity();
-  // FIXME: List information for all submodules.
-  llvm::errs() << "\n  Macros: "
-               << llvm::capacity_in_bytes(CurSubmoduleState->Macros);
-  llvm::errs() << "\n  #pragma push_macro Info: "
-               << llvm::capacity_in_bytes(PragmaPushMacroInfo);
-  llvm::errs() << "\n  Poison Reasons: "
-               << llvm::capacity_in_bytes(PoisonReasons);
-  llvm::errs() << "\n  Comment Handlers: "
-               << llvm::capacity_in_bytes(CommentHandlers) << "\n";
-}
-
-Preprocessor::macro_iterator
-Preprocessor::macro_begin(bool IncludeExternalMacros) const {
-  if (IncludeExternalMacros && ExternalSource &&
-      !ReadMacrosFromExternalSource) {
-    ReadMacrosFromExternalSource = true;
-    ExternalSource->ReadDefinedMacros();
-  }
-
-  // Make sure we cover all macros in visible modules.
-  for (const ModuleMacro &Macro : ModuleMacros)
-    CurSubmoduleState->Macros.insert(std::make_pair(Macro.II, MacroState()));
-
-  return CurSubmoduleState->Macros.begin();
-}
-
-size_t Preprocessor::getTotalMemory() const {
-  return BP.getTotalMemory()
-    + llvm::capacity_in_bytes(MacroExpandedTokens)
-    + Predefines.capacity() /* Predefines buffer. */
-    // FIXME: Include sizes from all submodules, and include MacroInfo sizes,
-    // and ModuleMacros.
-    + llvm::capacity_in_bytes(CurSubmoduleState->Macros)
-    + llvm::capacity_in_bytes(PragmaPushMacroInfo)
-    + llvm::capacity_in_bytes(PoisonReasons)
-    + llvm::capacity_in_bytes(CommentHandlers);
-}
-
-Preprocessor::macro_iterator
-Preprocessor::macro_end(bool IncludeExternalMacros) const {
-  if (IncludeExternalMacros && ExternalSource &&
-      !ReadMacrosFromExternalSource) {
-    ReadMacrosFromExternalSource = true;
-    ExternalSource->ReadDefinedMacros();
-  }
-
-  return CurSubmoduleState->Macros.end();
-}
-
-/// Compares macro tokens with a specified token value sequence.
-static bool MacroDefinitionEquals(const MacroInfo *MI,
-                                  ArrayRef<TokenValue> Tokens) {
-  return Tokens.size() == MI->getNumTokens() &&
-      std::equal(Tokens.begin(), Tokens.end(), MI->tokens_begin());
-}
-
-StringRef Preprocessor::getLastMacroWithSpelling(
-                                    SourceLocation Loc,
-                                    ArrayRef<TokenValue> Tokens) const {
-  SourceLocation BestLocation;
-  StringRef BestSpelling;
-  for (Preprocessor::macro_iterator I = macro_begin(), E = macro_end();
-       I != E; ++I) {
-    const MacroDirective::DefInfo
-      Def = I->second.findDirectiveAtLoc(Loc, SourceMgr);
-    if (!Def || !Def.getMacroInfo())
-      continue;
-    if (!Def.getMacroInfo()->isObjectLike())
-      continue;
-    if (!MacroDefinitionEquals(Def.getMacroInfo(), Tokens))
-      continue;
-    SourceLocation Location = Def.getLocation();
-    // Choose the macro defined latest.
-    if (BestLocation.isInvalid() ||
-        (Location.isValid() &&
-         SourceMgr.isBeforeInTranslationUnit(BestLocation, Location))) {
-      BestLocation = Location;
-      BestSpelling = I->first->getName();
-    }
-  }
-  return BestSpelling;
-}
-
-void Preprocessor::recomputeCurLexerKind() {
-  if (CurLexer)
-    CurLexerKind = CLK_Lexer;
-  else if (CurTokenLexer)
-    CurLexerKind = CLK_TokenLexer;
-  else
-    CurLexerKind = CLK_CachingLexer;
-}
-
-bool Preprocessor::SetCodeCompletionPoint(const FileEntry *File,
-                                          unsigned CompleteLine,
-                                          unsigned CompleteColumn) {
-  assert(File);
-  assert(CompleteLine && CompleteColumn && "Starts from 1:1");
-  assert(!CodeCompletionFile && "Already set");
-
-  // Load the actual file's contents.
-  Optional<llvm::MemoryBufferRef> Buffer =
-      SourceMgr.getMemoryBufferForFileOrNone(File);
-  if (!Buffer)
-    return true;
-
-  // Find the byte position of the truncation point.
-  const char *Position = Buffer->getBufferStart();
-  for (unsigned Line = 1; Line < CompleteLine; ++Line) {
-    for (; *Position; ++Position) {
-      if (*Position != '\r' && *Position != '\n')
-        continue;
-
-      // Eat \r\n or \n\r as a single line.
-      if ((Position[1] == '\r' || Position[1] == '\n') &&
-          Position[0] != Position[1])
-        ++Position;
-      ++Position;
-      break;
-    }
-  }
-
-  Position += CompleteColumn - 1;
-
-  // If pointing inside the preamble, adjust the position at the beginning of
-  // the file after the preamble.
-  if (SkipMainFilePreamble.first &&
-      SourceMgr.getFileEntryForID(SourceMgr.getMainFileID()) == File) {
-    if (Position - Buffer->getBufferStart() < SkipMainFilePreamble.first)
-      Position = Buffer->getBufferStart() + SkipMainFilePreamble.first;
-  }
-
-  if (Position > Buffer->getBufferEnd())
-    Position = Buffer->getBufferEnd();
-
-  CodeCompletionFile = File;
-  CodeCompletionOffset = Position - Buffer->getBufferStart();
-
-  auto NewBuffer = llvm::WritableMemoryBuffer::getNewUninitMemBuffer(
-      Buffer->getBufferSize() + 1, Buffer->getBufferIdentifier());
-  char *NewBuf = NewBuffer->getBufferStart();
-  char *NewPos = std::copy(Buffer->getBufferStart(), Position, NewBuf);
-  *NewPos = '\0';
-  std::copy(Position, Buffer->getBufferEnd(), NewPos+1);
-  SourceMgr.overrideFileContents(File, std::move(NewBuffer));
-
-  return false;
-}
-
-void Preprocessor::CodeCompleteIncludedFile(llvm::StringRef Dir,
-                                            bool IsAngled) {
-  setCodeCompletionReached();
-  if (CodeComplete)
-    CodeComplete->CodeCompleteIncludedFile(Dir, IsAngled);
-}
-
-void Preprocessor::CodeCompleteNaturalLanguage() {
-  setCodeCompletionReached();
-  if (CodeComplete)
-    CodeComplete->CodeCompleteNaturalLanguage();
-}
-
-/// getSpelling - This method is used to get the spelling of a token into a
-/// SmallVector. Note that the returned StringRef may not point to the
-/// supplied buffer if a copy can be avoided.
-StringRef Preprocessor::getSpelling(const Token &Tok,
-                                          SmallVectorImpl<char> &Buffer,
-                                          bool *Invalid) const {
-  // NOTE: this has to be checked *before* testing for an IdentifierInfo.
-  if (Tok.isNot(tok::raw_identifier) && !Tok.hasUCN()) {
-    // Try the fast path.
-    if (const IdentifierInfo *II = Tok.getIdentifierInfo())
-      return II->getName();
-  }
-
-  // Resize the buffer if we need to copy into it.
-  if (Tok.needsCleaning())
-    Buffer.resize(Tok.getLength());
-
-  const char *Ptr = Buffer.data();
-  unsigned Len = getSpelling(Tok, Ptr, Invalid);
-  return StringRef(Ptr, Len);
-}
-
-/// CreateString - Plop the specified string into a scratch buffer and return a
-/// location for it.  If specified, the source location provides a source
-/// location for the token.
-void Preprocessor::CreateString(StringRef Str, Token &Tok,
-                                SourceLocation ExpansionLocStart,
-                                SourceLocation ExpansionLocEnd) {
-  Tok.setLength(Str.size());
-
-  const char *DestPtr;
-  SourceLocation Loc = ScratchBuf->getToken(Str.data(), Str.size(), DestPtr);
-
-  if (ExpansionLocStart.isValid())
-    Loc = SourceMgr.createExpansionLoc(Loc, ExpansionLocStart,
-                                       ExpansionLocEnd, Str.size());
-  Tok.setLocation(Loc);
-
-  // If this is a raw identifier or a literal token, set the pointer data.
-  if (Tok.is(tok::raw_identifier))
-    Tok.setRawIdentifierData(DestPtr);
-  else if (Tok.isLiteral())
-    Tok.setLiteralData(DestPtr);
-}
-
-SourceLocation Preprocessor::SplitToken(SourceLocation Loc, unsigned Length) {
-  auto &SM = getSourceManager();
-  SourceLocation SpellingLoc = SM.getSpellingLoc(Loc);
-  std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(SpellingLoc);
-  bool Invalid = false;
-  StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid);
-  if (Invalid)
-    return SourceLocation();
-
-  // FIXME: We could consider re-using spelling for tokens we see repeatedly.
-  const char *DestPtr;
-  SourceLocation Spelling =
-      ScratchBuf->getToken(Buffer.data() + LocInfo.second, Length, DestPtr);
-  return SM.createTokenSplitLoc(Spelling, Loc, Loc.getLocWithOffset(Length));
-}
-
-Module *Preprocessor::getCurrentModule() {
-  if (!getLangOpts().isCompilingModule())
-    return nullptr;
-
-  return getHeaderSearchInfo().lookupModule(getLangOpts().CurrentModule);
-}
-
-//===----------------------------------------------------------------------===//
-// Preprocessor Initialization Methods
-//===----------------------------------------------------------------------===//
-
-/// EnterMainSourceFile - Enter the specified FileID as the main source file,
-/// which implicitly adds the builtin defines etc.
-void Preprocessor::EnterMainSourceFile() {
-  // We do not allow the preprocessor to reenter the main file.  Doing so will
-  // cause FileID's to accumulate information from both runs (e.g. #line
-  // information) and predefined macros aren't guaranteed to be set properly.
-  assert(NumEnteredSourceFiles == 0 && "Cannot reenter the main file!");
-  FileID MainFileID = SourceMgr.getMainFileID();
-
-  // If MainFileID is loaded it means we loaded an AST file, no need to enter
-  // a main file.
-  if (!SourceMgr.isLoadedFileID(MainFileID)) {
-    // Enter the main file source buffer.
-    EnterSourceFile(MainFileID, nullptr, SourceLocation());
-
-    // If we've been asked to skip bytes in the main file (e.g., as part of a
-    // precompiled preamble), do so now.
-    if (SkipMainFilePreamble.first > 0)
-      CurLexer->SetByteOffset(SkipMainFilePreamble.first,
-                              SkipMainFilePreamble.second);
-
-    // Tell the header info that the main file was entered.  If the file is later
-    // #imported, it won't be re-entered.
-    if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID))
-      markIncluded(FE);
-  }
-
-  // Preprocess Predefines to populate the initial preprocessor state.
-  std::unique_ptr<llvm::MemoryBuffer> SB =
-    llvm::MemoryBuffer::getMemBufferCopy(Predefines, "<built-in>");
-  assert(SB && "Cannot create predefined source buffer");
-  FileID FID = SourceMgr.createFileID(std::move(SB));
-  assert(FID.isValid() && "Could not create FileID for predefines?");
-  setPredefinesFileID(FID);
-
-  // Start parsing the predefines.
-  EnterSourceFile(FID, nullptr, SourceLocation());
-
-  if (!PPOpts->PCHThroughHeader.empty()) {
-    // Lookup and save the FileID for the through header. If it isn't found
-    // in the search path, it's a fatal error.
-    Optional<FileEntryRef> File = LookupFile(
-        SourceLocation(), PPOpts->PCHThroughHeader,
-        /*isAngled=*/false, /*FromDir=*/nullptr, /*FromFile=*/nullptr,
-        /*CurDir=*/nullptr, /*SearchPath=*/nullptr, /*RelativePath=*/nullptr,
-        /*SuggestedModule=*/nullptr, /*IsMapped=*/nullptr,
-        /*IsFrameworkFound=*/nullptr);
-    if (!File) {
-      Diag(SourceLocation(), diag::err_pp_through_header_not_found)
-          << PPOpts->PCHThroughHeader;
-      return;
-    }
-    setPCHThroughHeaderFileID(
-        SourceMgr.createFileID(*File, SourceLocation(), SrcMgr::C_User));
-  }
-
-  // Skip tokens from the Predefines and if needed the main file.
-  if ((usingPCHWithThroughHeader() && SkippingUntilPCHThroughHeader) ||
-      (usingPCHWithPragmaHdrStop() && SkippingUntilPragmaHdrStop))
-    SkipTokensWhileUsingPCH();
-}
-
-void Preprocessor::setPCHThroughHeaderFileID(FileID FID) {
-  assert(PCHThroughHeaderFileID.isInvalid() &&
-         "PCHThroughHeaderFileID already set!");
-  PCHThroughHeaderFileID = FID;
-}
-
-bool Preprocessor::isPCHThroughHeader(const FileEntry *FE) {
-  assert(PCHThroughHeaderFileID.isValid() &&
-         "Invalid PCH through header FileID");
-  return FE == SourceMgr.getFileEntryForID(PCHThroughHeaderFileID);
-}
-
-bool Preprocessor::creatingPCHWithThroughHeader() {
-  return TUKind == TU_Prefix && !PPOpts->PCHThroughHeader.empty() &&
-         PCHThroughHeaderFileID.isValid();
-}
-
-bool Preprocessor::usingPCHWithThroughHeader() {
-  return TUKind != TU_Prefix && !PPOpts->PCHThroughHeader.empty() &&
-         PCHThroughHeaderFileID.isValid();
-}
-
-bool Preprocessor::creatingPCHWithPragmaHdrStop() {
-  return TUKind == TU_Prefix && PPOpts->PCHWithHdrStop;
-}
-
-bool Preprocessor::usingPCHWithPragmaHdrStop() {
-  return TUKind != TU_Prefix && PPOpts->PCHWithHdrStop;
-}
-
-/// Skip tokens until after the #include of the through header or
-/// until after a #pragma hdrstop is seen. Tokens in the predefines file
-/// and the main file may be skipped. If the end of the predefines file
-/// is reached, skipping continues into the main file. If the end of the
-/// main file is reached, it's a fatal error.
-void Preprocessor::SkipTokensWhileUsingPCH() {
-  bool ReachedMainFileEOF = false;
-  bool UsingPCHThroughHeader = SkippingUntilPCHThroughHeader;
-  bool UsingPragmaHdrStop = SkippingUntilPragmaHdrStop;
-  Token Tok;
-  while (true) {
-    bool InPredefines =
-        (CurLexer && CurLexer->getFileID() == getPredefinesFileID());
-    switch (CurLexerKind) {
-    case CLK_Lexer:
-      CurLexer->Lex(Tok);
-     break;
-    case CLK_TokenLexer:
-      CurTokenLexer->Lex(Tok);
-      break;
-    case CLK_CachingLexer:
-      CachingLex(Tok);
-      break;
-    case CLK_LexAfterModuleImport:
-      LexAfterModuleImport(Tok);
-      break;
-    }
-    if (Tok.is(tok::eof) && !InPredefines) {
-      ReachedMainFileEOF = true;
-      break;
-    }
-    if (UsingPCHThroughHeader && !SkippingUntilPCHThroughHeader)
-      break;
-    if (UsingPragmaHdrStop && !SkippingUntilPragmaHdrStop)
-      break;
-  }
-  if (ReachedMainFileEOF) {
-    if (UsingPCHThroughHeader)
-      Diag(SourceLocation(), diag::err_pp_through_header_not_seen)
-          << PPOpts->PCHThroughHeader << 1;
-    else if (!PPOpts->PCHWithHdrStopCreate)
-      Diag(SourceLocation(), diag::err_pp_pragma_hdrstop_not_seen);
-  }
-}
-
-void Preprocessor::replayPreambleConditionalStack() {
-  // Restore the conditional stack from the preamble, if there is one.
-  if (PreambleConditionalStack.isReplaying()) {
-    assert(CurPPLexer &&
-           "CurPPLexer is null when calling replayPreambleConditionalStack.");
-    CurPPLexer->setConditionalLevels(PreambleConditionalStack.getStack());
-    PreambleConditionalStack.doneReplaying();
-    if (PreambleConditionalStack.reachedEOFWhileSkipping())
-      SkipExcludedConditionalBlock(
-          PreambleConditionalStack.SkipInfo->HashTokenLoc,
-          PreambleConditionalStack.SkipInfo->IfTokenLoc,
-          PreambleConditionalStack.SkipInfo->FoundNonSkipPortion,
-          PreambleConditionalStack.SkipInfo->FoundElse,
-          PreambleConditionalStack.SkipInfo->ElseLoc);
-  }
-}
-
-void Preprocessor::EndSourceFile() {
-  // Notify the client that we reached the end of the source file.
-  if (Callbacks)
-    Callbacks->EndOfMainFile();
-}
-
-//===----------------------------------------------------------------------===//
-// Lexer Event Handling.
-//===----------------------------------------------------------------------===//
-
-/// LookUpIdentifierInfo - Given a tok::raw_identifier token, look up the
-/// identifier information for the token and install it into the token,
-/// updating the token kind accordingly.
-IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier) const {
-  assert(!Identifier.getRawIdentifier().empty() && "No raw identifier data!");
-
-  // Look up this token, see if it is a macro, or if it is a language keyword.
-  IdentifierInfo *II;
-  if (!Identifier.needsCleaning() && !Identifier.hasUCN()) {
-    // No cleaning needed, just use the characters from the lexed buffer.
-    II = getIdentifierInfo(Identifier.getRawIdentifier());
-  } else {
-    // Cleaning needed, alloca a buffer, clean into it, then use the buffer.
-    SmallString<64> IdentifierBuffer;
-    StringRef CleanedStr = getSpelling(Identifier, IdentifierBuffer);
-
-    if (Identifier.hasUCN()) {
-      SmallString<64> UCNIdentifierBuffer;
-      expandUCNs(UCNIdentifierBuffer, CleanedStr);
-      II = getIdentifierInfo(UCNIdentifierBuffer);
-    } else {
-      II = getIdentifierInfo(CleanedStr);
-    }
-  }
-
-  // Update the token info (identifier info and appropriate token kind).
-  // FIXME: the raw_identifier may contain leading whitespace which is removed
-  // from the cleaned identifier token. The SourceLocation should be updated to
-  // refer to the non-whitespace character. For instance, the text "\\\nB" (a
-  // line continuation before 'B') is parsed as a single tok::raw_identifier and
-  // is cleaned to tok::identifier "B". After cleaning the token's length is
-  // still 3 and the SourceLocation refers to the location of the backslash.
-  Identifier.setIdentifierInfo(II);
-  Identifier.setKind(II->getTokenID());
-
-  return II;
-}
-
-void Preprocessor::SetPoisonReason(IdentifierInfo *II, unsigned DiagID) {
-  PoisonReasons[II] = DiagID;
-}
-
-void Preprocessor::PoisonSEHIdentifiers(bool Poison) {
-  assert(Ident__exception_code && Ident__exception_info);
-  assert(Ident___exception_code && Ident___exception_info);
-  Ident__exception_code->setIsPoisoned(Poison);
-  Ident___exception_code->setIsPoisoned(Poison);
-  Ident_GetExceptionCode->setIsPoisoned(Poison);
-  Ident__exception_info->setIsPoisoned(Poison);
-  Ident___exception_info->setIsPoisoned(Poison);
-  Ident_GetExceptionInfo->setIsPoisoned(Poison);
-  Ident__abnormal_termination->setIsPoisoned(Poison);
-  Ident___abnormal_termination->setIsPoisoned(Poison);
-  Ident_AbnormalTermination->setIsPoisoned(Poison);
-}
-
-void Preprocessor::HandlePoisonedIdentifier(Token & Identifier) {
-  assert(Identifier.getIdentifierInfo() &&
-         "Can't handle identifiers without identifier info!");
-  llvm::DenseMap<IdentifierInfo*,unsigned>::const_iterator it =
-    PoisonReasons.find(Identifier.getIdentifierInfo());
-  if(it == PoisonReasons.end())
-    Diag(Identifier, diag::err_pp_used_poisoned_id);
-  else
-    Diag(Identifier,it->second) << Identifier.getIdentifierInfo();
-}
-
-/// Returns a diagnostic message kind for reporting a future keyword as
-/// appropriate for the identifier and specified language.
-static diag::kind getFutureCompatDiagKind(const IdentifierInfo &II,
-                                          const LangOptions &LangOpts) {
-  assert(II.isFutureCompatKeyword() && "diagnostic should not be needed");
-
-  if (LangOpts.CPlusPlus)
-    return llvm::StringSwitch<diag::kind>(II.getName())
-#define CXX11_KEYWORD(NAME, FLAGS)                                             \
-        .Case(#NAME, diag::warn_cxx11_keyword)
-#define CXX20_KEYWORD(NAME, FLAGS)                                             \
-        .Case(#NAME, diag::warn_cxx20_keyword)
-#include "clang/Basic/TokenKinds.def"
-        // char8_t is not modeled as a CXX20_KEYWORD because it's not
-        // unconditionally enabled in C++20 mode. (It can be disabled
-        // by -fno-char8_t.)
-        .Case("char8_t", diag::warn_cxx20_keyword)
-        ;
-
-  llvm_unreachable(
-      "Keyword not known to come from a newer Standard or proposed Standard");
-}
-
-void Preprocessor::updateOutOfDateIdentifier(IdentifierInfo &II) const {
-  assert(II.isOutOfDate() && "not out of date");
-  getExternalSource()->updateOutOfDateIdentifier(II);
-}
-
-/// HandleIdentifier - This callback is invoked when the lexer reads an
-/// identifier.  This callback looks up the identifier in the map and/or
-/// potentially macro expands it or turns it into a named token (like 'for').
-///
-/// Note that callers of this method are guarded by checking the
-/// IdentifierInfo's 'isHandleIdentifierCase' bit.  If this method changes, the
-/// IdentifierInfo methods that compute these properties will need to change to
-/// match.
-bool Preprocessor::HandleIdentifier(Token &Identifier) {
-  assert(Identifier.getIdentifierInfo() &&
-         "Can't handle identifiers without identifier info!");
-
-  IdentifierInfo &II = *Identifier.getIdentifierInfo();
-
-  // If the information about this identifier is out of date, update it from
-  // the external source.
-  // We have to treat __VA_ARGS__ in a special way, since it gets
-  // serialized with isPoisoned = true, but our preprocessor may have
-  // unpoisoned it if we're defining a C99 macro.
-  if (II.isOutOfDate()) {
-    bool CurrentIsPoisoned = false;
-    const bool IsSpecialVariadicMacro =
-        &II == Ident__VA_ARGS__ || &II == Ident__VA_OPT__;
-    if (IsSpecialVariadicMacro)
-      CurrentIsPoisoned = II.isPoisoned();
-
-    updateOutOfDateIdentifier(II);
-    Identifier.setKind(II.getTokenID());
-
-    if (IsSpecialVariadicMacro)
-      II.setIsPoisoned(CurrentIsPoisoned);
-  }
-
-  // If this identifier was poisoned, and if it was not produced from a macro
-  // expansion, emit an error.
-  if (II.isPoisoned() && CurPPLexer) {
-    HandlePoisonedIdentifier(Identifier);
-  }
-
-  // If this is a macro to be expanded, do it.
-  if (MacroDefinition MD = getMacroDefinition(&II)) {
-    auto *MI = MD.getMacroInfo();
-    assert(MI && "macro definition with no macro info?");
-    if (!DisableMacroExpansion) {
-      if (!Identifier.isExpandDisabled() && MI->isEnabled()) {
-        // C99 6.10.3p10: If the preprocessing token immediately after the
-        // macro name isn't a '(', this macro should not be expanded.
-        if (!MI->isFunctionLike() || isNextPPTokenLParen())
-          return HandleMacroExpandedIdentifier(Identifier, MD);
-      } else {
-        // C99 6.10.3.4p2 says that a disabled macro may never again be
-        // expanded, even if it's in a context where it could be expanded in the
-        // future.
-        Identifier.setFlag(Token::DisableExpand);
-        if (MI->isObjectLike() || isNextPPTokenLParen())
-          Diag(Identifier, diag::pp_disabled_macro_expansion);
-      }
-    }
-  }
-
-  // If this identifier is a keyword in a newer Standard or proposed Standard,
-  // produce a warning. Don't warn if we're not considering macro expansion,
-  // since this identifier might be the name of a macro.
-  // FIXME: This warning is disabled in cases where it shouldn't be, like
-  //   "#define constexpr constexpr", "int constexpr;"
-  if (II.isFutureCompatKeyword() && !DisableMacroExpansion) {
-    Diag(Identifier, getFutureCompatDiagKind(II, getLangOpts()))
-        << II.getName();
-    // Don't diagnose this keyword again in this translation unit.
-    II.setIsFutureCompatKeyword(false);
-  }
-
-  // If this is an extension token, diagnose its use.
-  // We avoid diagnosing tokens that originate from macro definitions.
-  // FIXME: This warning is disabled in cases where it shouldn't be,
-  // like "#define TY typeof", "TY(1) x".
-  if (II.isExtensionToken() && !DisableMacroExpansion)
-    Diag(Identifier, diag::ext_token_used);
-
-  // If this is the 'import' contextual keyword following an '@', note
-  // that the next token indicates a module name.
-  //
-  // Note that we do not treat 'import' as a contextual
-  // keyword when we're in a caching lexer, because caching lexers only get
-  // used in contexts where import declarations are disallowed.
-  //
-  // Likewise if this is the C++ Modules TS import keyword.
-  if (((LastTokenWasAt && II.isModulesImport()) ||
-       Identifier.is(tok::kw_import)) &&
-      !InMacroArgs && !DisableMacroExpansion &&
-      (getLangOpts().Modules || getLangOpts().DebuggerSupport) &&
-      CurLexerKind != CLK_CachingLexer) {
-    ModuleImportLoc = Identifier.getLocation();
-    ModuleImportPath.clear();
-    ModuleImportExpectsIdentifier = true;
-    CurLexerKind = CLK_LexAfterModuleImport;
-  }
-  return true;
-}
-
-void Preprocessor::Lex(Token &Result) {
-  ++LexLevel;
-
-  // We loop here until a lex function returns a token; this avoids recursion.
-  bool ReturnedToken;
-  do {
-    switch (CurLexerKind) {
-    case CLK_Lexer:
-      ReturnedToken = CurLexer->Lex(Result);
-      break;
-    case CLK_TokenLexer:
-      ReturnedToken = CurTokenLexer->Lex(Result);
-      break;
-    case CLK_CachingLexer:
-      CachingLex(Result);
-      ReturnedToken = true;
-      break;
-    case CLK_LexAfterModuleImport:
-      ReturnedToken = LexAfterModuleImport(Result);
-      break;
-    }
-  } while (!ReturnedToken);
-
-  if (Result.is(tok::unknown) && TheModuleLoader.HadFatalFailure)
-    return;
-
-  if (Result.is(tok::code_completion) && Result.getIdentifierInfo()) {
-    // Remember the identifier before code completion token.
-    setCodeCompletionIdentifierInfo(Result.getIdentifierInfo());
-    setCodeCompletionTokenRange(Result.getLocation(), Result.getEndLoc());
-    // Set IdenfitierInfo to null to avoid confusing code that handles both
-    // identifiers and completion tokens.
-    Result.setIdentifierInfo(nullptr);
-  }
-
-  // Update ImportSeqState to track our position within a C++20 import-seq
-  // if this token is being produced as a result of phase 4 of translation.
-  if (getLangOpts().CPlusPlusModules && LexLevel == 1 &&
-      !Result.getFlag(Token::IsReinjected)) {
-    switch (Result.getKind()) {
-    case tok::l_paren: case tok::l_square: case tok::l_brace:
-      ImportSeqState.handleOpenBracket();
-      break;
-    case tok::r_paren: case tok::r_square:
-      ImportSeqState.handleCloseBracket();
-      break;
-    case tok::r_brace:
-      ImportSeqState.handleCloseBrace();
-      break;
-    case tok::semi:
-      ImportSeqState.handleSemi();
-      break;
-    case tok::header_name:
-    case tok::annot_header_unit:
-      ImportSeqState.handleHeaderName();
-      break;
-    case tok::kw_export:
-      ImportSeqState.handleExport();
-      break;
-    case tok::identifier:
-      if (Result.getIdentifierInfo()->isModulesImport()) {
-        ImportSeqState.handleImport();
-        if (ImportSeqState.afterImportSeq()) {
-          ModuleImportLoc = Result.getLocation();
-          ModuleImportPath.clear();
-          ModuleImportExpectsIdentifier = true;
-          CurLexerKind = CLK_LexAfterModuleImport;
-        }
-        break;
-      }
-      LLVM_FALLTHROUGH;
-    default:
-      ImportSeqState.handleMisc();
-      break;
-    }
-  }
-
-  LastTokenWasAt = Result.is(tok::at);
-  --LexLevel;
-
-  if ((LexLevel == 0 || PreprocessToken) &&
-      !Result.getFlag(Token::IsReinjected)) {
-    if (LexLevel == 0)
-      ++TokenCount;
-    if (OnToken)
-      OnToken(Result);
-  }
-}
-
-/// Lex a header-name token (including one formed from header-name-tokens if
-/// \p AllowConcatenation is \c true).
-///
-/// \param FilenameTok Filled in with the next token. On success, this will
-///        be either a header_name token. On failure, it will be whatever other
-///        token was found instead.
-/// \param AllowMacroExpansion If \c true, allow the header name to be formed
-///        by macro expansion (concatenating tokens as necessary if the first
-///        token is a '<').
-/// \return \c true if we reached EOD or EOF while looking for a > token in
-///         a concatenated header name and diagnosed it. \c false otherwise.
-bool Preprocessor::LexHeaderName(Token &FilenameTok, bool AllowMacroExpansion) {
-  // Lex using header-name tokenization rules if tokens are being lexed from
-  // a file. Just grab a token normally if we're in a macro expansion.
-  if (CurPPLexer)
-    CurPPLexer->LexIncludeFilename(FilenameTok);
-  else
-    Lex(FilenameTok);
-
-  // This could be a <foo/bar.h> file coming from a macro expansion.  In this
-  // case, glue the tokens together into an angle_string_literal token.
-  SmallString<128> FilenameBuffer;
-  if (FilenameTok.is(tok::less) && AllowMacroExpansion) {
-    bool StartOfLine = FilenameTok.isAtStartOfLine();
-    bool LeadingSpace = FilenameTok.hasLeadingSpace();
-    bool LeadingEmptyMacro = FilenameTok.hasLeadingEmptyMacro();
-
-    SourceLocation Start = FilenameTok.getLocation();
-    SourceLocation End;
-    FilenameBuffer.push_back('<');
-
-    // Consume tokens until we find a '>'.
-    // FIXME: A header-name could be formed starting or ending with an
-    // alternative token. It's not clear whether that's ill-formed in all
-    // cases.
-    while (FilenameTok.isNot(tok::greater)) {
-      Lex(FilenameTok);
-      if (FilenameTok.isOneOf(tok::eod, tok::eof)) {
-        Diag(FilenameTok.getLocation(), diag::err_expected) << tok::greater;
-        Diag(Start, diag::note_matching) << tok::less;
-        return true;
-      }
-
-      End = FilenameTok.getLocation();
-
-      // FIXME: Provide code completion for #includes.
-      if (FilenameTok.is(tok::code_completion)) {
-        setCodeCompletionReached();
-        Lex(FilenameTok);
-        continue;
-      }
-
-      // Append the spelling of this token to the buffer. If there was a space
-      // before it, add it now.
-      if (FilenameTok.hasLeadingSpace())
-        FilenameBuffer.push_back(' ');
-
-      // Get the spelling of the token, directly into FilenameBuffer if
-      // possible.
-      size_t PreAppendSize = FilenameBuffer.size();
-      FilenameBuffer.resize(PreAppendSize + FilenameTok.getLength());
-
-      const char *BufPtr = &FilenameBuffer[PreAppendSize];
-      unsigned ActualLen = getSpelling(FilenameTok, BufPtr);
-
-      // If the token was spelled somewhere else, copy it into FilenameBuffer.
-      if (BufPtr != &FilenameBuffer[PreAppendSize])
-        memcpy(&FilenameBuffer[PreAppendSize], BufPtr, ActualLen);
-
-      // Resize FilenameBuffer to the correct size.
-      if (FilenameTok.getLength() != ActualLen)
-        FilenameBuffer.resize(PreAppendSize + ActualLen);
-    }
-
-    FilenameTok.startToken();
-    FilenameTok.setKind(tok::header_name);
-    FilenameTok.setFlagValue(Token::StartOfLine, StartOfLine);
-    FilenameTok.setFlagValue(Token::LeadingSpace, LeadingSpace);
-    FilenameTok.setFlagValue(Token::LeadingEmptyMacro, LeadingEmptyMacro);
-    CreateString(FilenameBuffer, FilenameTok, Start, End);
-  } else if (FilenameTok.is(tok::string_literal) && AllowMacroExpansion) {
-    // Convert a string-literal token of the form " h-char-sequence "
-    // (produced by macro expansion) into a header-name token.
-    //
-    // The rules for header-names don't quite match the rules for
-    // string-literals, but all the places where they differ result in
-    // undefined behavior, so we can and do treat them the same.
-    //
-    // A string-literal with a prefix or suffix is not translated into a
-    // header-name. This could theoretically be observable via the C++20
-    // context-sensitive header-name formation rules.
-    StringRef Str = getSpelling(FilenameTok, FilenameBuffer);
-    if (Str.size() >= 2 && Str.front() == '"' && Str.back() == '"')
-      FilenameTok.setKind(tok::header_name);
-  }
-
-  return false;
-}
-
-/// Collect the tokens of a C++20 pp-import-suffix.
-void Preprocessor::CollectPpImportSuffix(SmallVectorImpl<Token> &Toks) {
-  // FIXME: For error recovery, consider recognizing attribute syntax here
-  // and terminating / diagnosing a missing semicolon if we find anything
-  // else? (Can we leave that to the parser?)
-  unsigned BracketDepth = 0;
-  while (true) {
-    Toks.emplace_back();
-    Lex(Toks.back());
-
-    switch (Toks.back().getKind()) {
-    case tok::l_paren: case tok::l_square: case tok::l_brace:
-      ++BracketDepth;
-      break;
-
-    case tok::r_paren: case tok::r_square: case tok::r_brace:
-      if (BracketDepth == 0)
-        return;
-      --BracketDepth;
-      break;
-
-    case tok::semi:
-      if (BracketDepth == 0)
-        return;
-    break;
-
-    case tok::eof:
-      return;
-
-    default:
-      break;
-    }
-  }
-}
-
-
-/// Lex a token following the 'import' contextual keyword.
-///
-///     pp-import: [C++20]
-///           import header-name pp-import-suffix[opt] ;
-///           import header-name-tokens pp-import-suffix[opt] ;
-/// [ObjC]    @ import module-name ;
-/// [Clang]   import module-name ;
-///
-///     header-name-tokens:
-///           string-literal
-///           < [any sequence of preprocessing-tokens other than >] >
-///
-///     module-name:
-///           module-name-qualifier[opt] identifier
-///
-///     module-name-qualifier
-///           module-name-qualifier[opt] identifier .
-///
-/// We respond to a pp-import by importing macros from the named module.
-bool Preprocessor::LexAfterModuleImport(Token &Result) {
-  // Figure out what kind of lexer we actually have.
-  recomputeCurLexerKind();
-
-  // Lex the next token. The header-name lexing rules are used at the start of
-  // a pp-import.
-  //
-  // For now, we only support header-name imports in C++20 mode.
-  // FIXME: Should we allow this in all language modes that support an import
-  // declaration as an extension?
-  if (ModuleImportPath.empty() && getLangOpts().CPlusPlusModules) {
-    if (LexHeaderName(Result))
-      return true;
-  } else {
-    Lex(Result);
-  }
-
-  // Allocate a holding buffer for a sequence of tokens and introduce it into
-  // the token stream.
-  auto EnterTokens = [this](ArrayRef<Token> Toks) {
-    auto ToksCopy = std::make_unique<Token[]>(Toks.size());
-    std::copy(Toks.begin(), Toks.end(), ToksCopy.get());
-    EnterTokenStream(std::move(ToksCopy), Toks.size(),
-                     /*DisableMacroExpansion*/ true, /*IsReinject*/ false);
-  };
-
-  // Check for a header-name.
-  SmallVector<Token, 32> Suffix;
-  if (Result.is(tok::header_name)) {
-    // Enter the header-name token into the token stream; a Lex action cannot
-    // both return a token and cache tokens (doing so would corrupt the token
-    // cache if the call to Lex comes from CachingLex / PeekAhead).
-    Suffix.push_back(Result);
-
-    // Consume the pp-import-suffix and expand any macros in it now. We'll add
-    // it back into the token stream later.
-    CollectPpImportSuffix(Suffix);
-    if (Suffix.back().isNot(tok::semi)) {
-      // This is not a pp-import after all.
-      EnterTokens(Suffix);
-      return false;
-    }
-
-    // C++2a [cpp.module]p1:
-    //   The ';' preprocessing-token terminating a pp-import shall not have
-    //   been produced by macro replacement.
-    SourceLocation SemiLoc = Suffix.back().getLocation();
-    if (SemiLoc.isMacroID())
-      Diag(SemiLoc, diag::err_header_import_semi_in_macro);
-
-    // Reconstitute the import token.
-    Token ImportTok;
-    ImportTok.startToken();
-    ImportTok.setKind(tok::kw_import);
-    ImportTok.setLocation(ModuleImportLoc);
-    ImportTok.setIdentifierInfo(getIdentifierInfo("import"));
-    ImportTok.setLength(6);
-
-    auto Action = HandleHeaderIncludeOrImport(
-        /*HashLoc*/ SourceLocation(), ImportTok, Suffix.front(), SemiLoc);
-    switch (Action.Kind) {
-    case ImportAction::None:
-      break;
-
-    case ImportAction::ModuleBegin:
-      // Let the parser know we're textually entering the module.
-      Suffix.emplace_back();
-      Suffix.back().startToken();
-      Suffix.back().setKind(tok::annot_module_begin);
-      Suffix.back().setLocation(SemiLoc);
-      Suffix.back().setAnnotationEndLoc(SemiLoc);
-      Suffix.back().setAnnotationValue(Action.ModuleForHeader);
-      LLVM_FALLTHROUGH;
-
-    case ImportAction::ModuleImport:
-    case ImportAction::SkippedModuleImport:
-      // We chose to import (or textually enter) the file. Convert the
-      // header-name token into a header unit annotation token.
-      Suffix[0].setKind(tok::annot_header_unit);
-      Suffix[0].setAnnotationEndLoc(Suffix[0].getLocation());
-      Suffix[0].setAnnotationValue(Action.ModuleForHeader);
-      // FIXME: Call the moduleImport callback?
-      break;
-    case ImportAction::Failure:
-      assert(TheModuleLoader.HadFatalFailure &&
-             "This should be an early exit only to a fatal error");
-      Result.setKind(tok::eof);
-      CurLexer->cutOffLexing();
-      EnterTokens(Suffix);
-      return true;
-    }
-
-    EnterTokens(Suffix);
-    return false;
-  }
-
-  // The token sequence
-  //
-  //   import identifier (. identifier)*
-  //
-  // indicates a module import directive. We already saw the 'import'
-  // contextual keyword, so now we're looking for the identifiers.
-  if (ModuleImportExpectsIdentifier && Result.getKind() == tok::identifier) {
-    // We expected to see an identifier here, and we did; continue handling
-    // identifiers.
-    ModuleImportPath.push_back(std::make_pair(Result.getIdentifierInfo(),
-                                              Result.getLocation()));
-    ModuleImportExpectsIdentifier = false;
-    CurLexerKind = CLK_LexAfterModuleImport;
-    return true;
-  }
-
-  // If we're expecting a '.' or a ';', and we got a '.', then wait until we
-  // see the next identifier. (We can also see a '[[' that begins an
-  // attribute-specifier-seq here under the C++ Modules TS.)
-  if (!ModuleImportExpectsIdentifier && Result.getKind() == tok::period) {
-    ModuleImportExpectsIdentifier = true;
-    CurLexerKind = CLK_LexAfterModuleImport;
-    return true;
-  }
-
-  // If we didn't recognize a module name at all, this is not a (valid) import.
-  if (ModuleImportPath.empty() || Result.is(tok::eof))
-    return true;
-
-  // Consume the pp-import-suffix and expand any macros in it now, if we're not
-  // at the semicolon already.
-  SourceLocation SemiLoc = Result.getLocation();
-  if (Result.isNot(tok::semi)) {
-    Suffix.push_back(Result);
-    CollectPpImportSuffix(Suffix);
-    if (Suffix.back().isNot(tok::semi)) {
-      // This is not an import after all.
-      EnterTokens(Suffix);
-      return false;
-    }
-    SemiLoc = Suffix.back().getLocation();
-  }
-
-  // Under the Modules TS, the dot is just part of the module name, and not
-  // a real hierarchy separator. Flatten such module names now.
-  //
-  // FIXME: Is this the right level to be performing this transformation?
-  std::string FlatModuleName;
-  if (getLangOpts().ModulesTS || getLangOpts().CPlusPlusModules) {
-    for (auto &Piece : ModuleImportPath) {
-      if (!FlatModuleName.empty())
-        FlatModuleName += ".";
-      FlatModuleName += Piece.first->getName();
-    }
-    SourceLocation FirstPathLoc = ModuleImportPath[0].second;
-    ModuleImportPath.clear();
-    ModuleImportPath.push_back(
-        std::make_pair(getIdentifierInfo(FlatModuleName), FirstPathLoc));
-  }
-
-  Module *Imported = nullptr;
-  if (getLangOpts().Modules) {
-    Imported = TheModuleLoader.loadModule(ModuleImportLoc,
-                                          ModuleImportPath,
-                                          Module::Hidden,
-                                          /*IsInclusionDirective=*/false);
-    if (Imported)
-      makeModuleVisible(Imported, SemiLoc);
-  }
-  if (Callbacks)
-    Callbacks->moduleImport(ModuleImportLoc, ModuleImportPath, Imported);
-
-  if (!Suffix.empty()) {
-    EnterTokens(Suffix);
-    return false;
-  }
-  return true;
-}
-
-void Preprocessor::makeModuleVisible(Module *M, SourceLocation Loc) {
-  CurSubmoduleState->VisibleModules.setVisible(
-      M, Loc, [](Module *) {},
-      [&](ArrayRef<Module *> Path, Module *Conflict, StringRef Message) {
-        // FIXME: Include the path in the diagnostic.
-        // FIXME: Include the import location for the conflicting module.
-        Diag(ModuleImportLoc, diag::warn_module_conflict)
-            << Path[0]->getFullModuleName()
-            << Conflict->getFullModuleName()
-            << Message;
-      });
-
-  // Add this module to the imports list of the currently-built submodule.
-  if (!BuildingSubmoduleStack.empty() && M != BuildingSubmoduleStack.back().M)
-    BuildingSubmoduleStack.back().M->Imports.insert(M);
-}
-
-bool Preprocessor::FinishLexStringLiteral(Token &Result, std::string &String,
-                                          const char *DiagnosticTag,
-                                          bool AllowMacroExpansion) {
-  // We need at least one string literal.
-  if (Result.isNot(tok::string_literal)) {
-    Diag(Result, diag::err_expected_string_literal)
-      << /*Source='in...'*/0 << DiagnosticTag;
-    return false;
-  }
-
-  // Lex string literal tokens, optionally with macro expansion.
-  SmallVector<Token, 4> StrToks;
-  do {
-    StrToks.push_back(Result);
-
-    if (Result.hasUDSuffix())
-      Diag(Result, diag::err_invalid_string_udl);
-
-    if (AllowMacroExpansion)
-      Lex(Result);
-    else
-      LexUnexpandedToken(Result);
-  } while (Result.is(tok::string_literal));
-
-  // Concatenate and parse the strings.
-  StringLiteralParser Literal(StrToks, *this);
-  assert(Literal.isAscii() && "Didn't allow wide strings in");
-
-  if (Literal.hadError)
-    return false;
-
-  if (Literal.Pascal) {
-    Diag(StrToks[0].getLocation(), diag::err_expected_string_literal)
-      << /*Source='in...'*/0 << DiagnosticTag;
-    return false;
-  }
-
-  String = std::string(Literal.GetString());
-  return true;
-}
-
-bool Preprocessor::parseSimpleIntegerLiteral(Token &Tok, uint64_t &Value) {
-  assert(Tok.is(tok::numeric_constant));
-  SmallString<8> IntegerBuffer;
-  bool NumberInvalid = false;
-  StringRef Spelling = getSpelling(Tok, IntegerBuffer, &NumberInvalid);
-  if (NumberInvalid)
-    return false;
-  NumericLiteralParser Literal(Spelling, Tok.getLocation(), getSourceManager(),
-                               getLangOpts(), getTargetInfo(),
-                               getDiagnostics());
-  if (Literal.hadError || !Literal.isIntegerLiteral() || Literal.hasUDSuffix())
-    return false;
-  llvm::APInt APVal(64, 0);
-  if (Literal.GetIntegerValue(APVal))
-    return false;
-  Lex(Tok);
-  Value = APVal.getLimitedValue();
-  return true;
-}
-
-void Preprocessor::addCommentHandler(CommentHandler *Handler) {
-  assert(Handler && "NULL comment handler");
-  assert(!llvm::is_contained(CommentHandlers, Handler) &&
-         "Comment handler already registered");
-  CommentHandlers.push_back(Handler);
-}
-
-void Preprocessor::removeCommentHandler(CommentHandler *Handler) {
-  std::vector<CommentHandler *>::iterator Pos =
-      llvm::find(CommentHandlers, Handler);
-  assert(Pos != CommentHandlers.end() && "Comment handler not registered");
-  CommentHandlers.erase(Pos);
-}
-
-bool Preprocessor::HandleComment(Token &result, SourceRange Comment) {
-  bool AnyPendingTokens = false;
-  for (std::vector<CommentHandler *>::iterator H = CommentHandlers.begin(),
-       HEnd = CommentHandlers.end();
-       H != HEnd; ++H) {
-    if ((*H)->HandleComment(*this, Comment))
-      AnyPendingTokens = true;
-  }
-  if (!AnyPendingTokens || getCommentRetentionState())
-    return false;
-  Lex(result);
-  return true;
-}
-
-void Preprocessor::emitMacroDeprecationWarning(const Token &Identifier) const {
-  const MacroAnnotations &A =
-      getMacroAnnotations(Identifier.getIdentifierInfo());
-  assert(A.DeprecationInfo &&
-         "Macro deprecation warning without recorded annotation!");
-  const MacroAnnotationInfo &Info = *A.DeprecationInfo;
-  if (Info.Message.empty())
-    Diag(Identifier, diag::warn_pragma_deprecated_macro_use)
-        << Identifier.getIdentifierInfo() << 0;
-  else
-    Diag(Identifier, diag::warn_pragma_deprecated_macro_use)
-        << Identifier.getIdentifierInfo() << 1 << Info.Message;
-  Diag(Info.Location, diag::note_pp_macro_annotation) << 0;
-}
-
-void Preprocessor::emitRestrictExpansionWarning(const Token &Identifier) const {
-  const MacroAnnotations &A =
-      getMacroAnnotations(Identifier.getIdentifierInfo());
-  assert(A.RestrictExpansionInfo &&
-         "Macro restricted expansion warning without recorded annotation!");
-  const MacroAnnotationInfo &Info = *A.RestrictExpansionInfo;
-  if (Info.Message.empty())
-    Diag(Identifier, diag::warn_pragma_restrict_expansion_macro_use)
-        << Identifier.getIdentifierInfo() << 0;
-  else
-    Diag(Identifier, diag::warn_pragma_restrict_expansion_macro_use)
-        << Identifier.getIdentifierInfo() << 1 << Info.Message;
-  Diag(Info.Location, diag::note_pp_macro_annotation) << 1;
-}
-
-void Preprocessor::emitFinalMacroWarning(const Token &Identifier,
-                                         bool IsUndef) const {
-  const MacroAnnotations &A =
-      getMacroAnnotations(Identifier.getIdentifierInfo());
-  assert(A.FinalAnnotationLoc &&
-         "Final macro warning without recorded annotation!");
-
-  Diag(Identifier, diag::warn_pragma_final_macro)
-      << Identifier.getIdentifierInfo() << (IsUndef ? 0 : 1);
-  Diag(*A.FinalAnnotationLoc, diag::note_pp_macro_annotation) << 2;
-}
-
-ModuleLoader::~ModuleLoader() = default;
-
-CommentHandler::~CommentHandler() = default;
-
-EmptylineHandler::~EmptylineHandler() = default;
-
-CodeCompletionHandler::~CodeCompletionHandler() = default;
-
-void Preprocessor::createPreprocessingRecord() {
-  if (Record)
-    return;
-
-  Record = new PreprocessingRecord(getSourceManager());
-  addPPCallbacks(std::unique_ptr<PPCallbacks>(Record));
-}