105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
//===--- PTHLexer.h - Lexer based on Pre-tokenized input --------*- 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 PTHLexer interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LEX_PTHLEXER_H
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#define LLVM_CLANG_LEX_PTHLEXER_H
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#include "clang/Lex/PreprocessorLexer.h"
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namespace clang {
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class PTHManager;
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class PTHSpellingSearch;
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class PTHLexer : public PreprocessorLexer {
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SourceLocation FileStartLoc;
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/// TokBuf - Buffer from PTH file containing raw token data.
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const unsigned char* TokBuf;
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/// CurPtr - Pointer into current offset of the token buffer where
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/// the next token will be read.
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const unsigned char* CurPtr;
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/// LastHashTokPtr - Pointer into TokBuf of the last processed '#'
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/// token that appears at the start of a line.
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const unsigned char* LastHashTokPtr;
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/// PPCond - Pointer to a side table in the PTH file that provides a
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/// a consise summary of the preproccessor conditional block structure.
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/// This is used to perform quick skipping of conditional blocks.
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const unsigned char* PPCond;
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/// CurPPCondPtr - Pointer inside PPCond that refers to the next entry
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/// to process when doing quick skipping of preprocessor blocks.
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const unsigned char* CurPPCondPtr;
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PTHLexer(const PTHLexer &) = delete;
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void operator=(const PTHLexer &) = delete;
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/// ReadToken - Used by PTHLexer to read tokens TokBuf.
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void ReadToken(Token& T);
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bool LexEndOfFile(Token &Result);
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/// PTHMgr - The PTHManager object that created this PTHLexer.
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PTHManager& PTHMgr;
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Token EofToken;
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protected:
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friend class PTHManager;
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/// Create a PTHLexer for the specified token stream.
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PTHLexer(Preprocessor& pp, FileID FID, const unsigned char *D,
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const unsigned char* ppcond, PTHManager &PM);
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public:
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~PTHLexer() override {}
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/// Lex - Return the next token.
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bool Lex(Token &Tok);
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void getEOF(Token &Tok);
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/// DiscardToEndOfLine - Read the rest of the current preprocessor line as an
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/// uninterpreted string. This switches the lexer out of directive mode.
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void DiscardToEndOfLine();
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/// isNextPPTokenLParen - Return 1 if the next unexpanded token will return a
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/// tok::l_paren token, 0 if it is something else and 2 if there are no more
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/// tokens controlled by this lexer.
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unsigned isNextPPTokenLParen() {
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// isNextPPTokenLParen is not on the hot path, and all we care about is
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// whether or not we are at a token with kind tok::eof or tok::l_paren.
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// Just read the first byte from the current token pointer to determine
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// its kind.
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tok::TokenKind x = (tok::TokenKind)*CurPtr;
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return x == tok::eof ? 2 : x == tok::l_paren;
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}
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/// IndirectLex - An indirect call to 'Lex' that can be invoked via
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/// the PreprocessorLexer interface.
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void IndirectLex(Token &Result) override { Lex(Result); }
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/// getSourceLocation - Return a source location for the token in
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/// the current file.
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SourceLocation getSourceLocation() override;
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/// SkipBlock - Used by Preprocessor to skip the current conditional block.
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bool SkipBlock();
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};
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} // end namespace clang
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#endif
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