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//===-- llvm/MC/MCAsmLexer.h - Abstract Asm Lexer Interface -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCASMLEXER_H
#define LLVM_MC_MCASMLEXER_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/SMLoc.h"
namespace llvm {
/// AsmToken - Target independent representation for an assembler token.
class AsmToken {
public:
enum TokenKind {
// Markers
Eof, Error,
// String values.
Identifier,
String,
// Integer values.
Integer,
// Real values.
Real,
// Register values (stored in IntVal). Only used by MCTargetAsmLexer.
Register,
// No-value.
EndOfStatement,
Colon,
Plus, Minus, Tilde,
Slash, // '/'
BackSlash, // '\'
LParen, RParen, LBrac, RBrac, LCurly, RCurly,
Star, Dot, Comma, Dollar, Equal, EqualEqual,
Pipe, PipePipe, Caret,
Amp, AmpAmp, Exclaim, ExclaimEqual, Percent, Hash,
Less, LessEqual, LessLess, LessGreater,
Greater, GreaterEqual, GreaterGreater, At
};
private:
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, 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;
SMLoc getEndLoc() const;
/// getStringContents - Get the contents of a string token (without quotes).
StringRef getStringContents() const {
assert(Kind == String && "This token isn't a string!");
return Str.slice(1, Str.size() - 1);
}
/// getIdentifier - Get the identifier string for the current token, which
/// should be an identifier or a string. This gets the portion of the string
/// which should be used as the identifier, e.g., it does not include the
/// quotes on strings.
StringRef getIdentifier() const {
if (Kind == Identifier)
return getString();
return getStringContents();
}
/// 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;
}
/// getRegVal - Get the register number for the current token, which should
/// be a register.
unsigned getRegVal() const {
assert(Kind == Register && "This token isn't a register!");
return static_cast<unsigned>(IntVal);
}
};
/// MCAsmLexer - Generic assembler lexer interface, for use by target specific
/// assembly lexers.
class MCAsmLexer {
/// The current token, stored in the base class for faster access.
AsmToken CurTok;
/// The location and description of the current error
SMLoc ErrLoc;
std::string Err;
MCAsmLexer(const MCAsmLexer &); // DO NOT IMPLEMENT
void operator=(const MCAsmLexer &); // DO NOT IMPLEMENT
protected: // Can only create subclasses.
const char *TokStart;
MCAsmLexer();
virtual AsmToken LexToken() = 0;
void SetError(const SMLoc &errLoc, const std::string &err) {
ErrLoc = errLoc;
Err = err;
}
public:
virtual ~MCAsmLexer();
/// Lex - Consume the next token from the input stream and return it.
///
/// The lexer will continuosly return the end-of-file token once the end of
/// the main input file has been reached.
const AsmToken &Lex() {
return CurTok = LexToken();
}
virtual StringRef LexUntilEndOfStatement() = 0;
/// getLoc - Get the current source location.
SMLoc getLoc() const;
/// getTok - Get the current (last) lexed token.
const AsmToken &getTok() {
return CurTok;
}
/// getErrLoc - Get the current error location
const SMLoc &getErrLoc() {
return ErrLoc;
}
/// getErr - Get the current error string
const std::string &getErr() {
return Err;
}
/// getKind - Get the kind of current token.
AsmToken::TokenKind getKind() const { return CurTok.getKind(); }
/// is - Check if the current token has kind \arg K.
bool is(AsmToken::TokenKind K) const { return CurTok.is(K); }
/// isNot - Check if the current token has kind \arg K.
bool isNot(AsmToken::TokenKind K) const { return CurTok.isNot(K); }
};
} // End llvm namespace
#endif
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