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//===- AsmLexer.h - Lexer for Assembly Files --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class declares the lexer for assembly files.
//
//===----------------------------------------------------------------------===//
#ifndef ASMLEXER_H
#define ASMLEXER_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCAsmLexer.h"
#include "llvm/Support/DataTypes.h"
#include <string>
#include <cassert>
namespace llvm {
class MemoryBuffer;
class SourceMgr;
class SMLoc;
/// AsmToken - Target independent representation for an assembler token.
struct AsmToken {
enum TokenKind {
// Markers
Eof, Error,
// String values.
Identifier,
Register,
String,
// Integer values.
Integer,
// No-value.
EndOfStatement,
Colon,
Plus, Minus, Tilde,
Slash, // '/'
LParen, RParen,
Star, Comma, Dollar, Equal, EqualEqual,
Pipe, PipePipe, Caret,
Amp, AmpAmp, Exclaim, ExclaimEqual, Percent,
Less, LessEqual, LessLess, LessGreater,
Greater, GreaterEqual, GreaterGreater
};
TokenKind Kind;
/// A reference to the entire token contents; this is always a pointer into
/// a memory buffer owned by the source manager.
StringRef Str;
int64_t IntVal;
public:
AsmToken() {}
AsmToken(TokenKind _Kind, const StringRef &_Str, int64_t _IntVal = 0)
: Kind(_Kind), Str(_Str), IntVal(_IntVal) {}
TokenKind getKind() const { return Kind; }
bool is(TokenKind K) const { return Kind == K; }
bool isNot(TokenKind K) const { return Kind != K; }
SMLoc getLoc() const;
/// getString - Get the string for the current token, this includes all
/// characters (for example, the quotes on strings) in the token.
///
/// The returned StringRef points into the source manager's memory buffer, and
/// is safe to store across calls to Lex().
StringRef getString() const { return Str; }
// FIXME: Don't compute this in advance, it makes every token larger, and is
// also not generally what we want (it is nicer for recovery etc. to lex 123br
// as a single token, then diagnose as an invalid number).
int64_t getIntVal() const {
assert(Kind == Integer && "This token isn't an integer");
return IntVal;
}
};
/// AsmLexer - Lexer class for assembly files.
class AsmLexer : public MCAsmLexer {
SourceMgr &SrcMgr;
const char *CurPtr;
const MemoryBuffer *CurBuf;
const char *TokStart;
/// The current token.
AsmToken CurTok;
/// This is the current buffer index we're lexing from as managed by the
/// SourceMgr object.
int CurBuffer;
void operator=(const AsmLexer&); // DO NOT IMPLEMENT
AsmLexer(const AsmLexer&); // DO NOT IMPLEMENT
public:
AsmLexer(SourceMgr &SrcMgr);
~AsmLexer();
AsmToken::TokenKind Lex() {
return CurTok = LexToken(), getKind();
}
AsmToken::TokenKind getKind() const { return CurTok.getKind(); }
bool is(AsmToken::TokenKind K) const { return CurTok.is(K); }
bool isNot(AsmToken::TokenKind K) const { return CurTok.isNot(K); }
SMLoc getLoc() const;
/// getTok - Return a reference to the current (last) lexed token.
const AsmToken &getTok() const { return CurTok; }
/// EnterIncludeFile - Enter the specified file. This returns true on failure.
bool EnterIncludeFile(const std::string &Filename);
void PrintMessage(SMLoc Loc, const std::string &Msg, const char *Type) const;
private:
int getNextChar();
AsmToken ReturnError(const char *Loc, const std::string &Msg);
/// LexToken - Read the next token and return its code.
AsmToken LexToken();
AsmToken LexIdentifier();
AsmToken LexPercent();
AsmToken LexSlash();
AsmToken LexLineComment();
AsmToken LexDigit();
AsmToken LexQuote();
};
} // end namespace llvm
#endif
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