Home | History | Annotate | Download | only in AsmParser 
      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
     94