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//===--- PTHLexer.h - Lexer based on Pre-tokenized input --------*- 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 PTHLexer interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_PTHLEXER_H
#define LLVM_CLANG_PTHLEXER_H
#include "clang/Lex/PreprocessorLexer.h"
#include <vector>
namespace clang {
class PTHManager;
class PTHSpellingSearch;
class PTHLexer : public PreprocessorLexer {
private:
/// FileID - The SourceManager FileID for the original source file.
unsigned FileID;
/// TokBuf - Buffer from PTH file containing raw token data.
const char* TokBuf;
/// CurPtr - Pointer into current offset of the token buffer where
/// the next token will be read.
const char* CurPtr;
/// LastHashTokPtr - Pointer into TokBuf of the last processed '#'
/// token that appears at the start of a line.
const char* LastHashTokPtr;
/// PPCond - Pointer to a side table in the PTH file that provides a
/// a consise summary of the preproccessor conditional block structure.
/// This is used to perform quick skipping of conditional blocks.
const char* PPCond;
/// CurPPCondPtr - Pointer inside PPCond that refers to the next entry
/// to process when doing quick skipping of preprocessor blocks.
const char* CurPPCondPtr;
/// MySpellingMgr - Reference to the spelling manager used to get spellings
/// for the source file indicated by \c FileID.
PTHSpellingSearch& MySpellingSrch;
PTHLexer(const PTHLexer&); // DO NOT IMPLEMENT
void operator=(const PTHLexer&); // DO NOT IMPLEMENT
/// ReadToken - Used by PTHLexer to read tokens TokBuf.
void ReadToken(Token& T);
/// PTHMgr - The PTHManager object that created this PTHLexer.
PTHManager& PTHMgr;
Token EofToken;
protected:
friend class PTHManager;
/// Create a PTHLexer for the specified token stream.
PTHLexer(Preprocessor& pp, SourceLocation fileloc, const char* D,
const char* ppcond,
PTHSpellingSearch& mySpellingSrch,
PTHManager& PM);
public:
~PTHLexer() {}
/// Lex - Return the next token.
void Lex(Token &Tok);
void getEOF(Token &Tok);
/// DiscardToEndOfLine - Read the rest of the current preprocessor line as an
/// uninterpreted string. This switches the lexer out of directive mode.
void DiscardToEndOfLine();
/// isNextPPTokenLParen - Return 1 if the next unexpanded token will return a
/// tok::l_paren token, 0 if it is something else and 2 if there are no more
/// tokens controlled by this lexer.
unsigned isNextPPTokenLParen() {
// isNextPPTokenLParen is not on the hot path, and all we care about is
// whether or not we are at a token with kind tok::eof or tok::l_paren.
// Just read the first byte from the current token pointer to determine
// its kind.
tok::TokenKind x = (tok::TokenKind) (unsigned char) *CurPtr;
return x == tok::eof ? 2 : x == tok::l_paren;
}
/// IndirectLex - An indirect call to 'Lex' that can be invoked via
/// the PreprocessorLexer interface.
void IndirectLex(Token &Result) { Lex(Result); }
/// Returns the cached spelling of a token.
/// \param[in] sloc The SourceLocation of the token.
/// \param[out] Buffer If a token's spelling is found in the PTH file then
/// upon exit from this method \c Buffer will be set to the address of
/// the character array representing that spelling. No characters
/// are copied.
/// \returns The number of characters for the spelling of the token. This
/// value is 0 if the spelling could not be found in the PTH file.
unsigned getSpelling(SourceLocation sloc, const char *&Buffer);
/// getSourceLocation - Return a source location for the token in
/// the current file.
SourceLocation getSourceLocation();
/// SkipBlock - Used by Preprocessor to skip the current conditional block.
bool SkipBlock();
};
} // end namespace clang
#endif
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