tools/llvm-mc/AsmLexer.h

   1 //===- AsmLexer.h - Lexer for Assembly Files --------------------*- 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 // This class declares the lexer for assembly files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ASMLEXER_H
  15 #define ASMLEXER_H
  16
  17 #include "llvm/ADT/StringRef.h"
  18 #include "llvm/MC/MCAsmLexer.h"
  19 #include "llvm/MC/MCAsmInfo.h"
  20 #include "llvm/Support/DataTypes.h"
  21 #include <string>
  22 #include <cassert>
  23
  24 namespace llvm {
  25 class MemoryBuffer;
  26 class SourceMgr;
  27 class SMLoc;
  28 class MCAsmInfo;
  29
  30 /// AsmLexer - Lexer class for assembly files.
  31 class AsmLexer : public MCAsmLexer {
  32   SourceMgr &SrcMgr;
  33   const MCAsmInfo MAI;
  34
  35   const char *CurPtr;
  36   const MemoryBuffer *CurBuf;
  37
  38   const char *TokStart;
  39
  40   /// This is the current buffer index we're lexing from as managed by the
  41   /// SourceMgr object.
  42   int CurBuffer;
  43
  44   void operator=(const AsmLexer&); // DO NOT IMPLEMENT
  45   AsmLexer(const AsmLexer&);       // DO NOT IMPLEMENT
  46
  47 protected:
  48   /// LexToken - Read the next token and return its code.
  49   virtual AsmToken LexToken();
  50
  51 public:
  52   AsmLexer(SourceMgr &SrcMgr, const MCAsmInfo &MAI);
  53   ~AsmLexer();
  54
  55   SMLoc getLoc() const;
  56
  57   StringRef LexUntilEndOfStatement();
  58
  59
  60   /// EnterIncludeFile - Enter the specified file. This returns true on failure.
  61   bool EnterIncludeFile(const std::string &Filename);
  62
  63   void PrintMessage(SMLoc Loc, const std::string &Msg, const char *Type) const;
  64
  65 private:
  66   int getNextChar();
  67   AsmToken ReturnError(const char *Loc, const std::string &Msg);
  68
  69   AsmToken LexIdentifier();
  70   AsmToken LexSlash();
  71   AsmToken LexLineComment();
  72   AsmToken LexDigit();
  73   AsmToken LexQuote();
  74 };
  75
  76 } // end namespace llvm
  77
  78 #endif