include/llvm/MC/MCParser/MCAsmParser.h

   1 //===-- llvm/MC/MCAsmParser.h - Abstract Asm Parser Interface ---*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef LLVM_MC_MCASMPARSER_H
  11 #define LLVM_MC_MCASMPARSER_H
  12
  13 #include "llvm/System/DataTypes.h"
  14
  15 namespace llvm {
  16 class AsmToken;
  17 class MCAsmLexer;
  18 class MCAsmParserExtension;
  19 class MCContext;
  20 class MCExpr;
  21 class MCStreamer;
  22 class SMLoc;
  23 class SourceMgr;
  24 class StringRef;
  25 class Twine;
  26
  27 /// MCAsmParser - Generic assembler parser interface, for use by target specific
  28 /// assembly parsers.
  29 class MCAsmParser {
  30 public:
  31   typedef bool (MCAsmParserExtension::*DirectiveHandler)(StringRef, SMLoc);
  32
  33 private:
  34   MCAsmParser(const MCAsmParser &);   // DO NOT IMPLEMENT
  35   void operator=(const MCAsmParser &);  // DO NOT IMPLEMENT
  36 protected: // Can only create subclasses.
  37   MCAsmParser();
  38
  39 public:
  40   virtual ~MCAsmParser();
  41
  42   virtual void AddDirectiveHandler(MCAsmParserExtension *Object,
  43                                    StringRef Directive,
  44                                    DirectiveHandler Handler) = 0;
  45
  46   virtual SourceMgr &getSourceManager() = 0;
  47
  48   virtual MCAsmLexer &getLexer() = 0;
  49
  50   virtual MCContext &getContext() = 0;
  51
  52   /// getStreamer - Return the output streamer for the assembler.
  53   virtual MCStreamer &getStreamer() = 0;
  54
  55   /// Warning - Emit a warning at the location \arg L, with the message \arg
  56   /// Msg.
  57   virtual void Warning(SMLoc L, const Twine &Msg) = 0;
  58
  59   /// Error - Emit an error at the location \arg L, with the message \arg
  60   /// Msg.
  61   ///
  62   /// \return The return value is always true, as an idiomatic convenience to
  63   /// clients.
  64   virtual bool Error(SMLoc L, const Twine &Msg) = 0;
  65
  66   /// Lex - Get the next AsmToken in the stream, possibly handling file
  67   /// inclusion first.
  68   virtual const AsmToken &Lex() = 0;
  69
  70   /// getTok - Get the current AsmToken from the stream.
  71   const AsmToken &getTok();
  72
  73   /// \brief Report an error at the current lexer location.
  74   bool TokError(const char *Msg);
  75
  76   /// ParseExpression - Parse an arbitrary expression.
  77   ///
  78   /// @param Res - The value of the expression. The result is undefined
  79   /// on error.
  80   /// @result - False on success.
  81   virtual bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
  82   bool ParseExpression(const MCExpr *&Res);
  83
  84   /// ParseParenExpression - Parse an arbitrary expression, assuming that an
  85   /// initial '(' has already been consumed.
  86   ///
  87   /// @param Res - The value of the expression. The result is undefined
  88   /// on error.
  89   /// @result - False on success.
  90   virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
  91
  92   /// ParseAbsoluteExpression - Parse an expression which must evaluate to an
  93   /// absolute value.
  94   ///
  95   /// @param Res - The value of the absolute expression. The result is undefined
  96   /// on error.
  97   /// @result - False on success.
  98   virtual bool ParseAbsoluteExpression(int64_t &Res) = 0;
  99 };
 100
 101 } // End llvm namespace
 102
 103 #endif