lib/AsmParser/LLLexer.h

   1 //===- LLLexer.h - Lexer for LLVM 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 represents the Lexer for .ll files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LIB_ASMPARSER_LLLEXER_H
  15 #define LIB_ASMPARSER_LLLEXER_H
  16
  17 #include "LLToken.h"
  18 #include "llvm/ADT/APSInt.h"
  19 #include "llvm/ADT/APFloat.h"
  20 #include <string>
  21
  22 namespace llvm {
  23   class MemoryBuffer;
  24   class Type;
  25   class ParseError;
  26
  27   class LLLexer {
  28     const char *CurPtr;
  29     MemoryBuffer *CurBuf;
  30     ParseError &ErrorInfo;
  31
  32     // Information about the current token.
  33     const char *TokStart;
  34     lltok::Kind CurKind;
  35     std::string StrVal;
  36     unsigned UIntVal;
  37     const Type *TyVal;
  38     APFloat APFloatVal;
  39     APSInt  APSIntVal;
  40
  41     std::string TheError;
  42   public:
  43     explicit LLLexer(MemoryBuffer *StartBuf, ParseError &);
  44     ~LLLexer() {}
  45
  46     lltok::Kind Lex() {
  47       return CurKind = LexToken();
  48     }
  49
  50     typedef const char* LocTy;
  51     LocTy getLoc() const { return TokStart; }
  52     lltok::Kind getKind() const { return CurKind; }
  53     const std::string getStrVal() const { return StrVal; }
  54     const Type *getTyVal() const { return TyVal; }
  55     unsigned getUIntVal() const { return UIntVal; }
  56     const APSInt &getAPSIntVal() const { return APSIntVal; }
  57     const APFloat &getAPFloatVal() const { return APFloatVal; }
  58
  59
  60     bool Error(LocTy L, const std::string &Msg) const;
  61     bool Error(const std::string &Msg) const { return Error(CurPtr, Msg); }
  62     std::string getFilename() const;
  63
  64   private:
  65     lltok::Kind LexToken();
  66
  67     int getNextChar();
  68     void SkipLineComment();
  69     lltok::Kind LexIdentifier();
  70     lltok::Kind LexDigitOrNegative();
  71     lltok::Kind LexPositive();
  72     lltok::Kind LexAt();
  73     lltok::Kind LexPercent();
  74     lltok::Kind LexQuote();
  75     lltok::Kind Lex0x();
  76
  77     uint64_t atoull(const char *Buffer, const char *End);
  78     uint64_t HexIntToVal(const char *Buffer, const char *End);
  79     void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);
  80     void FP80HexToIntPair(const char *Buff, const char *End, uint64_t Pair[2]);
  81   };
  82 } // end namespace llvm
  83
  84 #endif