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//===-- llvm/MC/MCAsmParser.h - Abstract Asm Parser 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_MCASMPARSER_H
#define LLVM_MC_MCASMPARSER_H
#include "llvm/System/DataTypes.h"
namespace llvm {
class AsmToken;
class MCAsmLexer;
class MCContext;
class MCExpr;
class MCStreamer;
class MCValue;
class SMLoc;
class Twine;
/// MCAsmParser - Generic assembler parser interface, for use by target specific
/// assembly parsers.
class MCAsmParser {
MCAsmParser(const MCAsmParser &); // DO NOT IMPLEMENT
void operator=(const MCAsmParser &); // DO NOT IMPLEMENT
protected: // Can only create subclasses.
MCAsmParser();
public:
virtual ~MCAsmParser();
virtual MCAsmLexer &getLexer() = 0;
virtual MCContext &getContext() = 0;
/// getSteamer - Return the output streamer for the assembler.
virtual MCStreamer &getStreamer() = 0;
/// Warning - Emit a warning at the location \arg L, with the message \arg
/// Msg.
virtual void Warning(SMLoc L, const Twine &Msg) = 0;
/// Warning - Emit an error at the location \arg L, with the message \arg
/// Msg.
///
/// \return The return value is always true, as an idiomatic convenience to
/// clients.
virtual bool Error(SMLoc L, const Twine &Msg) = 0;
/// Lex - Get the next AsmToken in the stream, possibly handling file
/// inclusion first.
virtual const AsmToken &Lex() = 0;
/// getTok - Get the current AsmToken from the stream.
const AsmToken &getTok();
/// ParseExpression - Parse an arbitrary expression.
///
/// @param Res - The value of the expression. The result is undefined
/// on error.
/// @result - False on success.
virtual bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
bool ParseExpression(const MCExpr *&Res);
/// ParseParenExpression - Parse an arbitrary expression, assuming that an
/// initial '(' has already been consumed.
///
/// @param Res - The value of the expression. The result is undefined
/// on error.
/// @result - False on success.
virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
/// ParseAbsoluteExpression - Parse an expression which must evaluate to an
/// absolute value.
///
/// @param Res - The value of the absolute expression. The result is undefined
/// on error.
/// @result - False on success.
virtual bool ParseAbsoluteExpression(int64_t &Res) = 0;
};
} // End llvm namespace
#endif
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