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//===--- 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 "llvm/ADT/DenseMap.h"
#include <string>
namespace llvm {
class MemoryBuffer;
}
namespace clang {
class FileEntry;
class IdentifierInfo;
class IdentifierTable;
class PTHLexer;
class PTHManager;
class PTHSpellingSearch {
PTHManager& PTHMgr;
const char* const TableBeg;
const char* const TableEnd;
const unsigned NumSpellings;
const char* LinearItr;
public:
enum { SpellingEntrySize = 4*2 };
unsigned getSpellingBinarySearch(unsigned fpos, const char *&Buffer);
unsigned getSpellingLinearSearch(unsigned fpos, const char *&Buffer);
PTHSpellingSearch(PTHManager& pm, unsigned numSpellings, const char* tableBeg)
: PTHMgr(pm),
TableBeg(tableBeg),
TableEnd(tableBeg + numSpellings*SpellingEntrySize),
NumSpellings(numSpellings),
LinearItr(tableBeg) {}
};
class PTHManager {
friend class PTHLexer;
friend class PTHSpellingSearch;
/// The memory mapped PTH file.
const llvm::MemoryBuffer* Buf;
/// A map from FileIDs to SpellingSearch objects.
llvm::DenseMap<unsigned,PTHSpellingSearch*> SpellingMap;
/// IdMap - A lazily generated cache mapping from persistent identifiers to
/// IdentifierInfo*.
IdentifierInfo** PerIDCache;
/// 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, IdentifierInfo** perIDCache,
Preprocessor& pp);
// Do not implement.
PTHManager();
void operator=(const PTHManager&);
/// GetIdentifierInfo - Used by PTHManager to reconstruct IdentifierInfo
/// objects from the PTH file.
IdentifierInfo* GetIdentifierInfo(unsigned);
/// getSpellingAtPTHOffset - Used by PTHLexer classes to get the cached
/// spelling for a token.
unsigned getSpellingAtPTHOffset(unsigned PTHOffset, const char*& Buffer);
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);
unsigned getSpelling(unsigned FileID, unsigned fpos, const char *& Buffer);
};
} // end namespace clang
#endif
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