Added PTHManager, a utility class that will be used by Preprocessor to lazily create PTHLexer objects for pre-tokenized files.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60436 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 87 insertions, 0 deletions

diff --git a/include/clang/Lex/PTHManager.h b/include/clang/Lex/PTHManager.h
new file mode 100644
index 0000000000..fc37a8a151
--- /dev/null
+++ b/include/clang/Lex/PTHManager.h
@@ -0,0 +1,87 @@
+//===--- PTHManager.h - Manager object for PTH processing -------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the PTHManager interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_PTHMANAGER_H
+#define LLVM_CLANG_PTHMANAGER_H
+
+#include "clang/Lex/PTHLexer.h"
+#include "clang/Basic/LangOptions.h"
+#include <string>
+
+namespace llvm {
+  class MemoryBuffer;
+}
+
+namespace clang {
+
+class FileEntry;
+class IdentifierInfo;
+class IdentifierTable;
+  
+class PTHManager {
+  /// The memory mapped PTH file.
+  const llvm::MemoryBuffer* Buf;
+  
+  /// IdMap - A lazily generated cache mapping from persistent identifiers to
+  ///  IdentifierInfo*.
+  void* PersistentIDCache;
+  
+  /// FileLookup - Abstract data structure used for mapping between files
+  ///  and token data in the PTH file.
+  void* FileLookup;
+  
+  /// IdDataTable - Array representing the mapping from persistent IDs to the
+  ///  data offset within the PTH file containing the information to
+  ///  reconsitute an IdentifierInfo.
+  const char* IdDataTable;
+  
+  /// ITable - The IdentifierTable used for the translation unit being lexed.
+  IdentifierTable& ITable;
+
+  /// PP - The Preprocessor object that will use this PTHManager to create
+  ///  PTHLexer objects.
+  Preprocessor& PP;
+  
+  /// This constructor is intended to only be called by the static 'Create'
+  /// method.
+  PTHManager(const llvm::MemoryBuffer* buf, void* fileLookup,
+             const char* idDataTable, Preprocessor& pp);
+
+  // Do not implement.
+  PTHManager();
+  void operator=(const PTHManager&);
+  
+  /// ReadIdentifierInfo - Used by PTHManager to reconstruct IdentifierInfo
+  ///  objects from the PTH file.
+  IdentifierInfo* ReadIdentifierInfo(const char*& D);
+  
+  /// ReadToken - Used by PTHManager to read tokens from the PTH file.
+  void ReadToken(const char*& D, unsigned FileID, Token& T);
+
+public:
+  
+  ~PTHManager();
+  
+  /// Create - This method creates PTHManager objects.  The 'file' argument
+  ///  is the name of the PTH file.  This method returns NULL upon failure.
+  static PTHManager* Create(const std::string& file, Preprocessor& PP);
+  
+  /// CreateLexer - Return a PTHLexer that "lexes" the cached tokens for the
+  ///  specified file.  This method returns NULL if no cached tokens exist.
+  ///  It is the responsibility of the caller to 'delete' the returned object.
+  PTHLexer* CreateLexer(unsigned FileID, const FileEntry* FE);  
+};
+  
+}  // end namespace clang
+
+#endif