Update prebuilt Clang to r353983e.HEADq10.0

clang 9.0.5 (based on r353983e) from build 5696680.

Bug: http://b/135931688
Bug: http://b/136008926
Test: N/A
Change-Id: I922d17410047d2e2df4625615352c588ee71b203

1 files changed, 327 insertions, 0 deletions

diff --git a/clang-r353983e/include/clang/Serialization/ModuleManager.h b/clang-r353983e/include/clang/Serialization/ModuleManager.h
new file mode 100644
index 00000000..7bd7dc29
--- /dev/null
+++ b/clang-r353983e/include/clang/Serialization/ModuleManager.h
@@ -0,0 +1,327 @@
+//===- ModuleManager.cpp - Module Manager -----------------------*- 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 ModuleManager class, which manages a set of loaded
+//  modules for the ASTReader.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SERIALIZATION_MODULEMANAGER_H
+#define LLVM_CLANG_SERIALIZATION_MODULEMANAGER_H
+
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/Module.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Serialization/Module.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator.h"
+#include "llvm/ADT/iterator_range.h"
+#include <cstdint>
+#include <ctime>
+#include <memory>
+#include <string>
+#include <utility>
+
+namespace clang {
+
+class FileEntry;
+class FileManager;
+class GlobalModuleIndex;
+class HeaderSearch;
+class MemoryBufferCache;
+class ModuleMap;
+class PCHContainerReader;
+
+namespace serialization {
+
+/// Manages the set of modules loaded by an AST reader.
+class ModuleManager {
+  /// The chain of AST files, in the order in which we started to load
+  /// them (this order isn't really useful for anything).
+  SmallVector<std::unique_ptr<ModuleFile>, 2> Chain;
+
+  /// The chain of non-module PCH files. The first entry is the one named
+  /// by the user, the last one is the one that doesn't depend on anything
+  /// further.
+  SmallVector<ModuleFile *, 2> PCHChain;
+
+  // The roots of the dependency DAG of AST files. This is used
+  // to implement short-circuiting logic when running DFS over the dependencies.
+  SmallVector<ModuleFile *, 2> Roots;
+
+  /// All loaded modules, indexed by name.
+  llvm::DenseMap<const FileEntry *, ModuleFile *> Modules;
+
+  /// FileManager that handles translating between filenames and
+  /// FileEntry *.
+  FileManager &FileMgr;
+
+  /// Cache of PCM files.
+  IntrusiveRefCntPtr<MemoryBufferCache> PCMCache;
+
+  /// Knows how to unwrap module containers.
+  const PCHContainerReader &PCHContainerRdr;
+
+  /// Preprocessor's HeaderSearchInfo containing the module map.
+  const HeaderSearch &HeaderSearchInfo;
+
+  /// A lookup of in-memory (virtual file) buffers
+  llvm::DenseMap<const FileEntry *, std::unique_ptr<llvm::MemoryBuffer>>
+      InMemoryBuffers;
+
+  /// The visitation order.
+  SmallVector<ModuleFile *, 4> VisitOrder;
+
+  /// The list of module files that both we and the global module index
+  /// know about.
+  ///
+  /// Either the global index or the module manager may have modules that the
+  /// other does not know about, because the global index can be out-of-date
+  /// (in which case the module manager could have modules it does not) and
+  /// this particular translation unit might not have loaded all of the modules
+  /// known to the global index.
+  SmallVector<ModuleFile *, 4> ModulesInCommonWithGlobalIndex;
+
+  /// The global module index, if one is attached.
+  ///
+  /// The global module index will actually be owned by the ASTReader; this is
+  /// just an non-owning pointer.
+  GlobalModuleIndex *GlobalIndex = nullptr;
+
+  /// State used by the "visit" operation to avoid malloc traffic in
+  /// calls to visit().
+  struct VisitState {
+    explicit VisitState(unsigned N) : VisitNumber(N, 0) {
+      Stack.reserve(N);
+    }
+
+    ~VisitState() {
+      delete NextState;
+    }
+
+    /// The stack used when marking the imports of a particular module
+    /// as not-to-be-visited.
+    SmallVector<ModuleFile *, 4> Stack;
+
+    /// The visit number of each module file, which indicates when
+    /// this module file was last visited.
+    SmallVector<unsigned, 4> VisitNumber;
+
+    /// The next visit number to use to mark visited module files.
+    unsigned NextVisitNumber = 1;
+
+    /// The next visit state.
+    VisitState *NextState = nullptr;
+  };
+
+  /// The first visit() state in the chain.
+  VisitState *FirstVisitState = nullptr;
+
+  VisitState *allocateVisitState();
+  void returnVisitState(VisitState *State);
+
+public:
+  using ModuleIterator = llvm::pointee_iterator<
+      SmallVectorImpl<std::unique_ptr<ModuleFile>>::iterator>;
+  using ModuleConstIterator = llvm::pointee_iterator<
+      SmallVectorImpl<std::unique_ptr<ModuleFile>>::const_iterator>;
+  using ModuleReverseIterator = llvm::pointee_iterator<
+      SmallVectorImpl<std::unique_ptr<ModuleFile>>::reverse_iterator>;
+  using ModuleOffset = std::pair<uint32_t, StringRef>;
+
+  explicit ModuleManager(FileManager &FileMgr, MemoryBufferCache &PCMCache,
+                         const PCHContainerReader &PCHContainerRdr,
+                         const HeaderSearch &HeaderSearchInfo);
+  ~ModuleManager();
+
+  /// Forward iterator to traverse all loaded modules.
+  ModuleIterator begin() { return Chain.begin(); }
+
+  /// Forward iterator end-point to traverse all loaded modules
+  ModuleIterator end() { return Chain.end(); }
+
+  /// Const forward iterator to traverse all loaded modules.
+  ModuleConstIterator begin() const { return Chain.begin(); }
+
+  /// Const forward iterator end-point to traverse all loaded modules
+  ModuleConstIterator end() const { return Chain.end(); }
+
+  /// Reverse iterator to traverse all loaded modules.
+  ModuleReverseIterator rbegin() { return Chain.rbegin(); }
+
+  /// Reverse iterator end-point to traverse all loaded modules.
+  ModuleReverseIterator rend() { return Chain.rend(); }
+
+  /// A range covering the PCH and preamble module files loaded.
+  llvm::iterator_range<SmallVectorImpl<ModuleFile *>::const_iterator>
+  pch_modules() const {
+    return llvm::make_range(PCHChain.begin(), PCHChain.end());
+  }
+
+  /// Returns the primary module associated with the manager, that is,
+  /// the first module loaded
+  ModuleFile &getPrimaryModule() { return *Chain[0]; }
+
+  /// Returns the primary module associated with the manager, that is,
+  /// the first module loaded.
+  ModuleFile &getPrimaryModule() const { return *Chain[0]; }
+
+  /// Returns the module associated with the given index
+  ModuleFile &operator[](unsigned Index) const { return *Chain[Index]; }
+
+  /// Returns the module associated with the given file name.
+  ModuleFile *lookupByFileName(StringRef FileName) const;
+
+  /// Returns the module associated with the given module name.
+  ModuleFile *lookupByModuleName(StringRef ModName) const;
+
+  /// Returns the module associated with the given module file.
+  ModuleFile *lookup(const FileEntry *File) const;
+
+  /// Returns the in-memory (virtual file) buffer with the given name
+  std::unique_ptr<llvm::MemoryBuffer> lookupBuffer(StringRef Name);
+
+  /// Number of modules loaded
+  unsigned size() const { return Chain.size(); }
+
+  /// The result of attempting to add a new module.
+  enum AddModuleResult {
+    /// The module file had already been loaded.
+    AlreadyLoaded,
+
+    /// The module file was just loaded in response to this call.
+    NewlyLoaded,
+
+    /// The module file is missing.
+    Missing,
+
+    /// The module file is out-of-date.
+    OutOfDate
+  };
+
+  using ASTFileSignatureReader = ASTFileSignature (*)(StringRef);
+
+  /// Attempts to create a new module and add it to the list of known
+  /// modules.
+  ///
+  /// \param FileName The file name of the module to be loaded.
+  ///
+  /// \param Type The kind of module being loaded.
+  ///
+  /// \param ImportLoc The location at which the module is imported.
+  ///
+  /// \param ImportedBy The module that is importing this module, or NULL if
+  /// this module is imported directly by the user.
+  ///
+  /// \param Generation The generation in which this module was loaded.
+  ///
+  /// \param ExpectedSize The expected size of the module file, used for
+  /// validation. This will be zero if unknown.
+  ///
+  /// \param ExpectedModTime The expected modification time of the module
+  /// file, used for validation. This will be zero if unknown.
+  ///
+  /// \param ExpectedSignature The expected signature of the module file, used
+  /// for validation. This will be zero if unknown.
+  ///
+  /// \param ReadSignature Reads the signature from an AST file without actually
+  /// loading it.
+  ///
+  /// \param Module A pointer to the module file if the module was successfully
+  /// loaded.
+  ///
+  /// \param ErrorStr Will be set to a non-empty string if any errors occurred
+  /// while trying to load the module.
+  ///
+  /// \return A pointer to the module that corresponds to this file name,
+  /// and a value indicating whether the module was loaded.
+  AddModuleResult 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);
+
+  /// Remove the modules starting from First (to the end).
+  void removeModules(ModuleIterator First,
+                     llvm::SmallPtrSetImpl<ModuleFile *> &LoadedSuccessfully,
+                     ModuleMap *modMap);
+
+  /// Add an in-memory buffer the list of known buffers
+  void addInMemoryBuffer(StringRef FileName,
+                         std::unique_ptr<llvm::MemoryBuffer> Buffer);
+
+  /// Set the global module index.
+  void setGlobalIndex(GlobalModuleIndex *Index);
+
+  /// Notification from the AST reader that the given module file
+  /// has been "accepted", and will not (can not) be unloaded.
+  void moduleFileAccepted(ModuleFile *MF);
+
+  /// Visit each of the modules.
+  ///
+  /// This routine visits each of the modules, starting with the
+  /// "root" modules that no other loaded modules depend on, and
+  /// proceeding to the leaf modules, visiting each module only once
+  /// during the traversal.
+  ///
+  /// This traversal is intended to support various "lookup"
+  /// operations that can find data in any of the loaded modules.
+  ///
+  /// \param Visitor A visitor function that will be invoked with each
+  /// module. The return value must be convertible to bool; when false, the
+  /// visitation continues to modules that the current module depends on. When
+  /// true, the visitation skips any modules that the current module depends on.
+  ///
+  /// \param ModuleFilesHit If non-NULL, contains the set of module files
+  /// that we know we need to visit because the global module index told us to.
+  /// Any module that is known to both the global module index and the module
+  /// manager that is *not* in this set can be skipped.
+  void visit(llvm::function_ref<bool(ModuleFile &M)> Visitor,
+             llvm::SmallPtrSetImpl<ModuleFile *> *ModuleFilesHit = nullptr);
+
+  /// Attempt to resolve the given module file name to a file entry.
+  ///
+  /// \param FileName The name of the module file.
+  ///
+  /// \param ExpectedSize The size that the module file is expected to have.
+  /// If the actual size differs, the resolver should return \c true.
+  ///
+  /// \param ExpectedModTime The modification time that the module file is
+  /// expected to have. If the actual modification time differs, the resolver
+  /// should return \c true.
+  ///
+  /// \param File Will be set to the file if there is one, or null
+  /// otherwise.
+  ///
+  /// \returns True if a file exists but does not meet the size/
+  /// modification time criteria, false if the file is either available and
+  /// suitable, or is missing.
+  bool lookupModuleFile(StringRef FileName,
+                        off_t ExpectedSize,
+                        time_t ExpectedModTime,
+                        const FileEntry *&File);
+
+  /// View the graphviz representation of the module graph.
+  void viewGraph();
+
+  MemoryBufferCache &getPCMCache() const { return *PCMCache; }
+};
+
+} // namespace serialization
+
+} // namespace clang
+
+#endif // LLVM_CLANG_SERIALIZATION_MODULEMANAGER_H