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 "llvm/Support/SourceMgr.h"
  21 #include <string>
  22
  23 namespace llvm {
  24   class MemoryBuffer;
  25   class Type;
  26   class SMDiagnostic;
  27   class LLVMContext;
  28
  29   class LLLexer {
  30     const char *CurPtr;
  31     MemoryBuffer *CurBuf;
  32     SMDiagnostic &ErrorInfo;
  33     SourceMgr &SM;
  34     LLVMContext &Context;
  35
  36     // Information about the current token.
  37     const char *TokStart;
  38     lltok::Kind CurKind;
  39     std::string StrVal;
  40     unsigned UIntVal;
  41     Type *TyVal;
  42     APFloat APFloatVal;
  43     APSInt  APSIntVal;
  44
  45     std::string TheError;
  46   public:
  47     explicit LLLexer(MemoryBuffer *StartBuf, SourceMgr &SM, SMDiagnostic &,
  48                      LLVMContext &C);
  49     ~LLLexer() {}
  50
  51     lltok::Kind Lex() {
  52       return CurKind = LexToken();
  53     }
  54
  55     typedef SMLoc LocTy;
  56     LocTy getLoc() const { return SMLoc::getFromPointer(TokStart); }
  57     lltok::Kind getKind() const { return CurKind; }
  58     const std::string &getStrVal() const { return StrVal; }
  59     Type *getTyVal() const { return TyVal; }
  60     unsigned getUIntVal() const { return UIntVal; }
  61     const APSInt &getAPSIntVal() const { return APSIntVal; }
  62     const APFloat &getAPFloatVal() const { return APFloatVal; }
  63
  64
  65     bool Error(LocTy L, const Twine &Msg) const;
  66     bool Error(const Twine &Msg) const { return Error(getLoc(), Msg); }
  67     std::string getFilename() const;
  68
  69   private:
  70     lltok::Kind LexToken();
  71
  72     int getNextChar();
  73     void SkipLineComment();
  74     lltok::Kind ReadString(lltok::Kind kind);
  75     bool ReadVarName();
  76
  77     lltok::Kind LexIdentifier();
  78     lltok::Kind LexDigitOrNegative();
  79     lltok::Kind LexPositive();
  80     lltok::Kind LexAt();
  81     lltok::Kind LexExclaim();
  82     lltok::Kind LexPercent();
  83     lltok::Kind LexQuote();
  84     lltok::Kind Lex0x();
  85
  86     uint64_t atoull(const char *Buffer, const char *End);
  87     uint64_t HexIntToVal(const char *Buffer, const char *End);
  88     void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);
  89     void FP80HexToIntPair(const char *Buff, const char *End, uint64_t Pair[2]);
  90   };
  91 } // end namespace llvm
  92
  93 #endif