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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 PTHLexer : public PreprocessorLexer {
/// 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;
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 LastFetched;
Token EofToken;
bool NeedsFetching;
public:
/// Create a PTHLexer for the specified token stream.
PTHLexer(Preprocessor& pp, SourceLocation fileloc, const char* D,
PTHManager& PM);
~PTHLexer() {}
/// Lex - Return the next token.
void Lex(Token &Tok);
void setEOF(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() {
return AtLastToken() ? 2 : GetToken().is(tok::l_paren);
}
/// IndirectLex - An indirect call to 'Lex' that can be invoked via
/// the PreprocessorLexer interface.
void IndirectLex(Token &Result) { Lex(Result); }
/// getSourceLocation - Return a source location for the token in
/// the current file.
SourceLocation getSourceLocation() { return GetToken().getLocation(); }
private:
/// SkipToToken - Skip to the token at the specified offset in TokBuf.
void SkipToToken(unsigned offset) {
const char* NewPtr = TokBuf + offset;
assert(NewPtr > CurPtr && "SkipToToken should not go backwards!");
NeedsFetching = true;
CurPtr = NewPtr;
}
/// AtLastToken - Returns true if the PTHLexer is at the last token.
bool AtLastToken() {
Token T = GetToken();
return T.is(tok::eof) ? EofToken = T, true : false;
}
/// GetToken - Returns the next token. This method does not advance the
/// PTHLexer to the next token.
Token GetToken();
/// AdvanceToken - Advances the PTHLexer to the next token.
void AdvanceToken() { NeedsFetching = true; }
bool LexEndOfFile(Token &Result);
};
} // end namespace clang
#endif
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