Coverage Report

Created: 2018-12-04 06:45

/Users/buildslave/jenkins/workspace/clang-stage2-coverage-R/llvm/tools/clang/include/clang/Lex/PTHManager.h
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//===- PTHManager.h - Manager object for PTH processing ---------*- C++ -*-===//
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//
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//                     The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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//  This file defines the PTHManager interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LEX_PTHMANAGER_H
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#define LLVM_CLANG_LEX_PTHMANAGER_H
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#include "clang/Basic/IdentifierTable.h"
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#include "clang/Basic/SourceLocation.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/OnDiskHashTable.h"
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#include <memory>
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namespace llvm {
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class MemoryBuffer;
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} // namespace llvm
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namespace clang {
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class DiagnosticsEngine;
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class FileSystemStatCache;
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class Preprocessor;
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class PTHLexer;
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class PTHManager : public IdentifierInfoLookup {
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  friend class PTHLexer;
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  friend class PTHStatCache;
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  class PTHFileLookupTrait;
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  class PTHStringLookupTrait;
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  using PTHStringIdLookup = llvm::OnDiskChainedHashTable<PTHStringLookupTrait>;
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  using PTHFileLookup = llvm::OnDiskChainedHashTable<PTHFileLookupTrait>;
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  /// The memory mapped PTH file.
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  std::unique_ptr<const llvm::MemoryBuffer> Buf;
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  /// Alloc - Allocator used for IdentifierInfo objects.
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  llvm::BumpPtrAllocator Alloc;
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  /// IdMap - A lazily generated cache mapping from persistent identifiers to
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  ///  IdentifierInfo*.
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  std::unique_ptr<IdentifierInfo *[], llvm::FreeDeleter> PerIDCache;
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  /// FileLookup - Abstract data structure used for mapping between files
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  ///  and token data in the PTH file.
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  std::unique_ptr<PTHFileLookup> FileLookup;
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  /// IdDataTable - Array representing the mapping from persistent IDs to the
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  ///  data offset within the PTH file containing the information to
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  ///  reconsitute an IdentifierInfo.
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  const unsigned char* const IdDataTable;
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  /// SortedIdTable - Abstract data structure mapping from strings to
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  ///  persistent IDs.  This is used by get().
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  std::unique_ptr<PTHStringIdLookup> StringIdLookup;
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  /// NumIds - The number of identifiers in the PTH file.
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  const unsigned NumIds;
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  /// PP - The Preprocessor object that will use this PTHManager to create
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  ///  PTHLexer objects.
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  Preprocessor* PP = nullptr;
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  /// SpellingBase - The base offset within the PTH memory buffer that
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  ///  contains the cached spellings for literals.
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  const unsigned char* const SpellingBase;
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  /// OriginalSourceFile - A null-terminated C-string that specifies the name
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  ///  if the file (if any) that was to used to generate the PTH cache.
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  const char* OriginalSourceFile;
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  /// This constructor is intended to only be called by the static 'Create'
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  /// method.
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  PTHManager(std::unique_ptr<const llvm::MemoryBuffer> buf,
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             std::unique_ptr<PTHFileLookup> fileLookup,
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             const unsigned char *idDataTable,
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             std::unique_ptr<IdentifierInfo *[], llvm::FreeDeleter> perIDCache,
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             std::unique_ptr<PTHStringIdLookup> stringIdLookup, unsigned numIds,
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             const unsigned char *spellingBase, const char *originalSourceFile);
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  /// getSpellingAtPTHOffset - Used by PTHLexer classes to get the cached
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  ///  spelling for a token.
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  unsigned getSpellingAtPTHOffset(unsigned PTHOffset, const char*& Buffer);
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  /// GetIdentifierInfo - Used to reconstruct IdentifierInfo objects from the
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  ///  PTH file.
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  IdentifierInfo *GetIdentifierInfo(unsigned PersistentID) {
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    // Check if the IdentifierInfo has already been resolved.
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    if (IdentifierInfo* II = PerIDCache[PersistentID])
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      return II;
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    return LazilyCreateIdentifierInfo(PersistentID);
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  }
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  IdentifierInfo* LazilyCreateIdentifierInfo(unsigned PersistentID);
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public:
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  // The current PTH version.
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  enum { Version = 10 };
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  PTHManager(const PTHManager &) = delete;
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  PTHManager &operator=(const PTHManager &) = delete;
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  ~PTHManager() override;
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  /// getOriginalSourceFile - Return the full path to the original header
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  ///  file name that was used to generate the PTH cache.
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  const char* getOriginalSourceFile() const {
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    return OriginalSourceFile;
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  }
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  /// get - Return the identifier token info for the specified named identifier.
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  ///  Unlike the version in IdentifierTable, this returns a pointer instead
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  ///  of a reference.  If the pointer is nullptr then the IdentifierInfo cannot
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  ///  be found.
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  IdentifierInfo *get(StringRef Name) override;
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  /// Create - This method creates PTHManager objects.  The 'file' argument
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  ///  is the name of the PTH file.  This method returns nullptr upon failure.
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  static PTHManager *Create(StringRef file, DiagnosticsEngine &Diags);
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  void setPreprocessor(Preprocessor *pp) { PP = pp; }
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  /// CreateLexer - Return a PTHLexer that "lexes" the cached tokens for the
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  ///  specified file.  This method returns nullptr if no cached tokens exist.
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  ///  It is the responsibility of the caller to 'delete' the returned object.
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  PTHLexer *CreateLexer(FileID FID);
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  /// createStatCache - Returns a FileSystemStatCache object for use with
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  ///  FileManager objects.  These objects use the PTH data to speed up
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  ///  calls to stat by memoizing their results from when the PTH file
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  ///  was generated.
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  std::unique_ptr<FileSystemStatCache> createStatCache();
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};
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} // namespace clang
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#endif // LLVM_CLANG_LEX_PTHMANAGER_H