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103 lines
2.4 KiB
C++
103 lines
2.4 KiB
C++
//===- AsmLexer.h - Lexer for Assembly Files --------------------*- 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 class declares the lexer for assembly files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef ASMLEXER_H
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#define ASMLEXER_H
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#include "llvm/Support/DataTypes.h"
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#include <string>
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#include <cassert>
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namespace llvm {
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class MemoryBuffer;
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class SourceMgr;
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class SMLoc;
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namespace asmtok {
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enum TokKind {
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// Markers
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Eof, Error,
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Identifier,
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Register,
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IntVal,
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EndOfStatement,
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Colon,
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Plus,
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Minus,
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Slash, // '/'
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LParen, RParen,
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Star, Comma, Dollar
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};
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}
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/// AsmLexer - Lexer class for assembly files.
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class AsmLexer {
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SourceMgr &SrcMgr;
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const char *CurPtr;
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const MemoryBuffer *CurBuf;
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// Information about the current token.
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const char *TokStart;
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asmtok::TokKind CurKind;
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std::string CurStrVal; // This is valid for Identifier.
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int64_t CurIntVal;
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/// CurBuffer - This is the current buffer index we're lexing from as managed
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/// by the SourceMgr object.
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int CurBuffer;
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public:
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AsmLexer(SourceMgr &SrcMgr);
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~AsmLexer() {}
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asmtok::TokKind Lex() {
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return CurKind = LexToken();
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}
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asmtok::TokKind getKind() const { return CurKind; }
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const std::string &getCurStrVal() const {
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assert((CurKind == asmtok::Identifier || CurKind == asmtok::Register) &&
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"This token doesn't have a string value");
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return CurStrVal;
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}
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int64_t getCurIntVal() const {
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assert(CurKind == asmtok::IntVal && "This token isn't an integer");
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return CurIntVal;
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}
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SMLoc getLoc() const;
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void PrintError(const char *Loc, const std::string &Msg) const;
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void PrintError(SMLoc Loc, const std::string &Msg) const;
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private:
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int getNextChar();
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asmtok::TokKind ReturnError(const char *Loc, const std::string &Msg);
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/// LexToken - Read the next token and return its code.
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asmtok::TokKind LexToken();
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asmtok::TokKind LexIdentifier();
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asmtok::TokKind LexPercent();
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asmtok::TokKind LexSlash();
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asmtok::TokKind LexHash();
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asmtok::TokKind LexDigit();
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};
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} // end namespace llvm
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#endif
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