YDB Import 588

1384556be6811c00a4098d426b8eda9be6d2a541

1 files changed, 0 insertions, 523 deletions

diff --git a/contrib/libs/clang14/lib/Serialization/ModuleManager.cpp b/contrib/libs/clang14/lib/Serialization/ModuleManager.cpp
deleted file mode 100644
index 4fd217cf7a6..00000000000
--- a/contrib/libs/clang14/lib/Serialization/ModuleManager.cpp
+++ /dev/null
@@ -1,523 +0,0 @@
-//===- ModuleManager.cpp - Module Manager ---------------------------------===//
-//
-// 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 ModuleManager class, which manages a set of loaded
-//  modules for the ASTReader.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/Serialization/ModuleManager.h"
-#include "clang/Basic/FileManager.h"
-#include "clang/Basic/LLVM.h"
-#include "clang/Lex/HeaderSearch.h"
-#include "clang/Lex/ModuleMap.h"
-#include "clang/Serialization/GlobalModuleIndex.h"
-#include "clang/Serialization/InMemoryModuleCache.h"
-#include "clang/Serialization/ModuleFile.h"
-#include "clang/Serialization/PCHContainerOperations.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SetVector.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/iterator.h"
-#include "llvm/Support/Chrono.h"
-#include "llvm/Support/DOTGraphTraits.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/GraphWriter.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/VirtualFileSystem.h"
-#include <algorithm>
-#include <cassert>
-#include <memory>
-#include <string>
-#include <system_error>
-
-using namespace clang;
-using namespace serialization;
-
-ModuleFile *ModuleManager::lookupByFileName(StringRef Name) const {
-  auto Entry = FileMgr.getFile(Name, /*OpenFile=*/false,
-                               /*CacheFailure=*/false);
-  if (Entry)
-    return lookup(*Entry);
-
-  return nullptr;
-}
-
-ModuleFile *ModuleManager::lookupByModuleName(StringRef Name) const {
-  if (const Module *Mod = HeaderSearchInfo.getModuleMap().findModule(Name))
-    if (const FileEntry *File = Mod->getASTFile())
-      return lookup(File);
-
-  return nullptr;
-}
-
-ModuleFile *ModuleManager::lookup(const FileEntry *File) const {
-  auto Known = Modules.find(File);
-  if (Known == Modules.end())
-    return nullptr;
-
-  return Known->second;
-}
-
-std::unique_ptr<llvm::MemoryBuffer>
-ModuleManager::lookupBuffer(StringRef Name) {
-  auto Entry = FileMgr.getFile(Name, /*OpenFile=*/false,
-                               /*CacheFailure=*/false);
-  if (!Entry)
-    return nullptr;
-  return std::move(InMemoryBuffers[*Entry]);
-}
-
-static bool checkSignature(ASTFileSignature Signature,
-                           ASTFileSignature ExpectedSignature,
-                           std::string &ErrorStr) {
-  if (!ExpectedSignature || Signature == ExpectedSignature)
-    return false;
-
-  ErrorStr =
-      Signature ? "signature mismatch" : "could not read module signature";
-  return true;
-}
-
-static void updateModuleImports(ModuleFile &MF, ModuleFile *ImportedBy,
-                                SourceLocation ImportLoc) {
-  if (ImportedBy) {
-    MF.ImportedBy.insert(ImportedBy);
-    ImportedBy->Imports.insert(&MF);
-  } else {
-    if (!MF.DirectlyImported)
-      MF.ImportLoc = ImportLoc;
-
-    MF.DirectlyImported = true;
-  }
-}
-
-ModuleManager::AddModuleResult
-ModuleManager::addModule(StringRef FileName, ModuleKind Type,
-                         SourceLocation ImportLoc, ModuleFile *ImportedBy,
-                         unsigned Generation,
-                         off_t ExpectedSize, time_t ExpectedModTime,
-                         ASTFileSignature ExpectedSignature,
-                         ASTFileSignatureReader ReadSignature,
-                         ModuleFile *&Module,
-                         std::string &ErrorStr) {
-  Module = nullptr;
-
-  // Look for the file entry. This only fails if the expected size or
-  // modification time differ.
-  OptionalFileEntryRefDegradesToFileEntryPtr Entry;
-  if (Type == MK_ExplicitModule || Type == MK_PrebuiltModule) {
-    // If we're not expecting to pull this file out of the module cache, it
-    // might have a different mtime due to being moved across filesystems in
-    // a distributed build. The size must still match, though. (As must the
-    // contents, but we can't check that.)
-    ExpectedModTime = 0;
-  }
-  // Note: ExpectedSize and ExpectedModTime will be 0 for MK_ImplicitModule
-  // when using an ASTFileSignature.
-  if (lookupModuleFile(FileName, ExpectedSize, ExpectedModTime, Entry)) {
-    ErrorStr = "module file out of date";
-    return OutOfDate;
-  }
-
-  if (!Entry && FileName != "-") {
-    ErrorStr = "module file not found";
-    return Missing;
-  }
-
-  // The ModuleManager's use of FileEntry nodes as the keys for its map of
-  // loaded modules is less than ideal. Uniqueness for FileEntry nodes is
-  // maintained by FileManager, which in turn uses inode numbers on hosts
-  // that support that. When coupled with the module cache's proclivity for
-  // turning over and deleting stale PCMs, this means entries for different
-  // module files can wind up reusing the same underlying inode. When this
-  // happens, subsequent accesses to the Modules map will disagree on the
-  // ModuleFile associated with a given file. In general, it is not sufficient
-  // to resolve this conundrum with a type like FileEntryRef that stores the
-  // name of the FileEntry node on first access because of path canonicalization
-  // issues. However, the paths constructed for implicit module builds are
-  // fully under Clang's control. We *can*, therefore, rely on their structure
-  // being consistent across operating systems and across subsequent accesses
-  // to the Modules map.
-  auto implicitModuleNamesMatch = [](ModuleKind Kind, const ModuleFile *MF,
-                                     const FileEntry *Entry) -> bool {
-    if (Kind != MK_ImplicitModule)
-      return true;
-    return Entry->getName() == MF->FileName;
-  };
-
-  // Check whether we already loaded this module, before
-  if (ModuleFile *ModuleEntry = Modules.lookup(Entry)) {
-    if (implicitModuleNamesMatch(Type, ModuleEntry, Entry)) {
-      // Check the stored signature.
-      if (checkSignature(ModuleEntry->Signature, ExpectedSignature, ErrorStr))
-        return OutOfDate;
-
-      Module = ModuleEntry;
-      updateModuleImports(*ModuleEntry, ImportedBy, ImportLoc);
-      return AlreadyLoaded;
-    }
-  }
-
-  // Allocate a new module.
-  auto NewModule = std::make_unique<ModuleFile>(Type, Generation);
-  NewModule->Index = Chain.size();
-  NewModule->FileName = FileName.str();
-  NewModule->File = Entry;
-  NewModule->ImportLoc = ImportLoc;
-  NewModule->InputFilesValidationTimestamp = 0;
-
-  if (NewModule->Kind == MK_ImplicitModule) {
-    std::string TimestampFilename = NewModule->getTimestampFilename();
-    llvm::vfs::Status Status;
-    // A cached stat value would be fine as well.
-    if (!FileMgr.getNoncachedStatValue(TimestampFilename, Status))
-      NewModule->InputFilesValidationTimestamp =
-          llvm::sys::toTimeT(Status.getLastModificationTime());
-  }
-
-  // Load the contents of the module
-  if (std::unique_ptr<llvm::MemoryBuffer> Buffer = lookupBuffer(FileName)) {
-    // The buffer was already provided for us.
-    NewModule->Buffer = &ModuleCache->addBuiltPCM(FileName, std::move(Buffer));
-    // Since the cached buffer is reused, it is safe to close the file
-    // descriptor that was opened while stat()ing the PCM in
-    // lookupModuleFile() above, it won't be needed any longer.
-    Entry->closeFile();
-  } else if (llvm::MemoryBuffer *Buffer =
-                 getModuleCache().lookupPCM(FileName)) {
-    NewModule->Buffer = Buffer;
-    // As above, the file descriptor is no longer needed.
-    Entry->closeFile();
-  } else if (getModuleCache().shouldBuildPCM(FileName)) {
-    // Report that the module is out of date, since we tried (and failed) to
-    // import it earlier.
-    Entry->closeFile();
-    return OutOfDate;
-  } else {
-    // Open the AST file.
-    llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buf((std::error_code()));
-    if (FileName == "-") {
-      Buf = llvm::MemoryBuffer::getSTDIN();
-    } else {
-      // Get a buffer of the file and close the file descriptor when done.
-      // The file is volatile because in a parallel build we expect multiple
-      // compiler processes to use the same module file rebuilding it if needed.
-      //
-      // RequiresNullTerminator is false because module files don't need it, and
-      // this allows the file to still be mmapped.
-      Buf = FileMgr.getBufferForFile(NewModule->File,
-                                     /*IsVolatile=*/true,
-                                     /*RequiresNullTerminator=*/false);
-    }
-
-    if (!Buf) {
-      ErrorStr = Buf.getError().message();
-      return Missing;
-    }
-
-    NewModule->Buffer = &getModuleCache().addPCM(FileName, std::move(*Buf));
-  }
-
-  // Initialize the stream.
-  NewModule->Data = PCHContainerRdr.ExtractPCH(*NewModule->Buffer);
-
-  // Read the signature eagerly now so that we can check it.  Avoid calling
-  // ReadSignature unless there's something to check though.
-  if (ExpectedSignature && checkSignature(ReadSignature(NewModule->Data),
-                                          ExpectedSignature, ErrorStr))
-    return OutOfDate;
-
-  // We're keeping this module.  Store it everywhere.
-  Module = Modules[Entry] = NewModule.get();
-
-  updateModuleImports(*NewModule, ImportedBy, ImportLoc);
-
-  if (!NewModule->isModule())
-    PCHChain.push_back(NewModule.get());
-  if (!ImportedBy)
-    Roots.push_back(NewModule.get());
-
-  Chain.push_back(std::move(NewModule));
-  return NewlyLoaded;
-}
-
-void ModuleManager::removeModules(ModuleIterator First, ModuleMap *modMap) {
-  auto Last = end();
-  if (First == Last)
-    return;
-
-  // Explicitly clear VisitOrder since we might not notice it is stale.
-  VisitOrder.clear();
-
-  // Collect the set of module file pointers that we'll be removing.
-  llvm::SmallPtrSet<ModuleFile *, 4> victimSet(
-      (llvm::pointer_iterator<ModuleIterator>(First)),
-      (llvm::pointer_iterator<ModuleIterator>(Last)));
-
-  auto IsVictim = [&](ModuleFile *MF) {
-    return victimSet.count(MF);
-  };
-  // Remove any references to the now-destroyed modules.
-  for (auto I = begin(); I != First; ++I) {
-    I->Imports.remove_if(IsVictim);
-    I->ImportedBy.remove_if(IsVictim);
-  }
-  llvm::erase_if(Roots, IsVictim);
-
-  // Remove the modules from the PCH chain.
-  for (auto I = First; I != Last; ++I) {
-    if (!I->isModule()) {
-      PCHChain.erase(llvm::find(PCHChain, &*I), PCHChain.end());
-      break;
-    }
-  }
-
-  // Delete the modules and erase them from the various structures.
-  for (ModuleIterator victim = First; victim != Last; ++victim) {
-    Modules.erase(victim->File);
-
-    if (modMap) {
-      StringRef ModuleName = victim->ModuleName;
-      if (Module *mod = modMap->findModule(ModuleName)) {
-        mod->setASTFile(None);
-      }
-    }
-  }
-
-  // Delete the modules.
-  Chain.erase(Chain.begin() + (First - begin()), Chain.end());
-}
-
-void
-ModuleManager::addInMemoryBuffer(StringRef FileName,
-                                 std::unique_ptr<llvm::MemoryBuffer> Buffer) {
-  const FileEntry *Entry =
-      FileMgr.getVirtualFile(FileName, Buffer->getBufferSize(), 0);
-  InMemoryBuffers[Entry] = std::move(Buffer);
-}
-
-std::unique_ptr<ModuleManager::VisitState> ModuleManager::allocateVisitState() {
-  // Fast path: if we have a cached state, use it.
-  if (FirstVisitState) {
-    auto Result = std::move(FirstVisitState);
-    FirstVisitState = std::move(Result->NextState);
-    return Result;
-  }
-
-  // Allocate and return a new state.
-  return std::make_unique<VisitState>(size());
-}
-
-void ModuleManager::returnVisitState(std::unique_ptr<VisitState> State) {
-  assert(State->NextState == nullptr && "Visited state is in list?");
-  State->NextState = std::move(FirstVisitState);
-  FirstVisitState = std::move(State);
-}
-
-void ModuleManager::setGlobalIndex(GlobalModuleIndex *Index) {
-  GlobalIndex = Index;
-  if (!GlobalIndex) {
-    ModulesInCommonWithGlobalIndex.clear();
-    return;
-  }
-
-  // Notify the global module index about all of the modules we've already
-  // loaded.
-  for (ModuleFile &M : *this)
-    if (!GlobalIndex->loadedModuleFile(&M))
-      ModulesInCommonWithGlobalIndex.push_back(&M);
-}
-
-void ModuleManager::moduleFileAccepted(ModuleFile *MF) {
-  if (!GlobalIndex || GlobalIndex->loadedModuleFile(MF))
-    return;
-
-  ModulesInCommonWithGlobalIndex.push_back(MF);
-}
-
-ModuleManager::ModuleManager(FileManager &FileMgr,
-                             InMemoryModuleCache &ModuleCache,
-                             const PCHContainerReader &PCHContainerRdr,
-                             const HeaderSearch &HeaderSearchInfo)
-    : FileMgr(FileMgr), ModuleCache(&ModuleCache),
-      PCHContainerRdr(PCHContainerRdr), HeaderSearchInfo(HeaderSearchInfo) {}
-
-void ModuleManager::visit(llvm::function_ref<bool(ModuleFile &M)> Visitor,
-                          llvm::SmallPtrSetImpl<ModuleFile *> *ModuleFilesHit) {
-  // If the visitation order vector is the wrong size, recompute the order.
-  if (VisitOrder.size() != Chain.size()) {
-    unsigned N = size();
-    VisitOrder.clear();
-    VisitOrder.reserve(N);
-
-    // Record the number of incoming edges for each module. When we
-    // encounter a module with no incoming edges, push it into the queue
-    // to seed the queue.
-    SmallVector<ModuleFile *, 4> Queue;
-    Queue.reserve(N);
-    llvm::SmallVector<unsigned, 4> UnusedIncomingEdges;
-    UnusedIncomingEdges.resize(size());
-    for (ModuleFile &M : llvm::reverse(*this)) {
-      unsigned Size = M.ImportedBy.size();
-      UnusedIncomingEdges[M.Index] = Size;
-      if (!Size)
-        Queue.push_back(&M);
-    }
-
-    // Traverse the graph, making sure to visit a module before visiting any
-    // of its dependencies.
-    while (!Queue.empty()) {
-      ModuleFile *CurrentModule = Queue.pop_back_val();
-      VisitOrder.push_back(CurrentModule);
-
-      // For any module that this module depends on, push it on the
-      // stack (if it hasn't already been marked as visited).
-      for (ModuleFile *M : llvm::reverse(CurrentModule->Imports)) {
-        // Remove our current module as an impediment to visiting the
-        // module we depend on. If we were the last unvisited module
-        // that depends on this particular module, push it into the
-        // queue to be visited.
-        unsigned &NumUnusedEdges = UnusedIncomingEdges[M->Index];
-        if (NumUnusedEdges && (--NumUnusedEdges == 0))
-          Queue.push_back(M);
-      }
-    }
-
-    assert(VisitOrder.size() == N && "Visitation order is wrong?");
-
-    FirstVisitState = nullptr;
-  }
-
-  auto State = allocateVisitState();
-  unsigned VisitNumber = State->NextVisitNumber++;
-
-  // If the caller has provided us with a hit-set that came from the global
-  // module index, mark every module file in common with the global module
-  // index that is *not* in that set as 'visited'.
-  if (ModuleFilesHit && !ModulesInCommonWithGlobalIndex.empty()) {
-    for (unsigned I = 0, N = ModulesInCommonWithGlobalIndex.size(); I != N; ++I)
-    {
-      ModuleFile *M = ModulesInCommonWithGlobalIndex[I];
-      if (!ModuleFilesHit->count(M))
-        State->VisitNumber[M->Index] = VisitNumber;
-    }
-  }
-
-  for (unsigned I = 0, N = VisitOrder.size(); I != N; ++I) {
-    ModuleFile *CurrentModule = VisitOrder[I];
-    // Should we skip this module file?
-    if (State->VisitNumber[CurrentModule->Index] == VisitNumber)
-      continue;
-
-    // Visit the module.
-    assert(State->VisitNumber[CurrentModule->Index] == VisitNumber - 1);
-    State->VisitNumber[CurrentModule->Index] = VisitNumber;
-    if (!Visitor(*CurrentModule))
-      continue;
-
-    // The visitor has requested that cut off visitation of any
-    // module that the current module depends on. To indicate this
-    // behavior, we mark all of the reachable modules as having been visited.
-    ModuleFile *NextModule = CurrentModule;
-    do {
-      // For any module that this module depends on, push it on the
-      // stack (if it hasn't already been marked as visited).
-      for (llvm::SetVector<ModuleFile *>::iterator
-             M = NextModule->Imports.begin(),
-             MEnd = NextModule->Imports.end();
-           M != MEnd; ++M) {
-        if (State->VisitNumber[(*M)->Index] != VisitNumber) {
-          State->Stack.push_back(*M);
-          State->VisitNumber[(*M)->Index] = VisitNumber;
-        }
-      }
-
-      if (State->Stack.empty())
-        break;
-
-      // Pop the next module off the stack.
-      NextModule = State->Stack.pop_back_val();
-    } while (true);
-  }
-
-  returnVisitState(std::move(State));
-}
-
-bool ModuleManager::lookupModuleFile(StringRef FileName, off_t ExpectedSize,
-                                     time_t ExpectedModTime,
-                                     Optional<FileEntryRef> &File) {
-  File = None;
-  if (FileName == "-")
-    return false;
-
-  // Open the file immediately to ensure there is no race between stat'ing and
-  // opening the file.
-  Optional<FileEntryRef> FileOrErr =
-      expectedToOptional(FileMgr.getFileRef(FileName, /*OpenFile=*/true,
-                                            /*CacheFailure=*/false));
-  if (!FileOrErr)
-    return false;
-
-  File = *FileOrErr;
-
-  if ((ExpectedSize && ExpectedSize != File->getSize()) ||
-      (ExpectedModTime && ExpectedModTime != File->getModificationTime()))
-    // Do not destroy File, as it may be referenced. If we need to rebuild it,
-    // it will be destroyed by removeModules.
-    return true;
-
-  return false;
-}
-
-#ifndef NDEBUG
-namespace llvm {
-
-  template<>
-  struct GraphTraits<ModuleManager> {
-    using NodeRef = ModuleFile *;
-    using ChildIteratorType = llvm::SetVector<ModuleFile *>::const_iterator;
-    using nodes_iterator = pointer_iterator<ModuleManager::ModuleConstIterator>;
-
-    static ChildIteratorType child_begin(NodeRef Node) {
-      return Node->Imports.begin();
-    }
-
-    static ChildIteratorType child_end(NodeRef Node) {
-      return Node->Imports.end();
-    }
-
-    static nodes_iterator nodes_begin(const ModuleManager &Manager) {
-      return nodes_iterator(Manager.begin());
-    }
-
-    static nodes_iterator nodes_end(const ModuleManager &Manager) {
-      return nodes_iterator(Manager.end());
-    }
-  };
-
-  template<>
-  struct DOTGraphTraits<ModuleManager> : public DefaultDOTGraphTraits {
-    explicit DOTGraphTraits(bool IsSimple = false)
-        : DefaultDOTGraphTraits(IsSimple) {}
-
-    static bool renderGraphFromBottomUp() { return true; }
-
-    std::string getNodeLabel(ModuleFile *M, const ModuleManager&) {
-      return M->ModuleName;
-    }
-  };
-
-} // namespace llvm
-
-void ModuleManager::viewGraph() {
-  llvm::ViewGraph(*this, "Modules");
-}
-#endif