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      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 LLVM_LIB_ASMPARSER_LLLEXER_H
     15 #define LLVM_LIB_ASMPARSER_LLLEXER_H
     16 
     17 #include "LLToken.h"
     18 #include "llvm/ADT/APFloat.h"
     19 #include "llvm/ADT/APSInt.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     StringRef 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   public:
     46     explicit LLLexer(StringRef StartBuf, SourceMgr &SM, SMDiagnostic &,
     47                      LLVMContext &C);
     48 
     49     lltok::Kind Lex() {
     50       return CurKind = LexToken();
     51     }
     52 
     53     typedef SMLoc LocTy;
     54     LocTy getLoc() const { return SMLoc::getFromPointer(TokStart); }
     55     lltok::Kind getKind() const { return CurKind; }
     56     const std::string &getStrVal() const { return StrVal; }
     57     Type *getTyVal() const { return TyVal; }
     58     unsigned getUIntVal() const { return UIntVal; }
     59     const APSInt &getAPSIntVal() const { return APSIntVal; }
     60     const APFloat &getAPFloatVal() const { return APFloatVal; }
     61 
     62 
     63     bool Error(LocTy L, const Twine &Msg) const;
     64     bool Error(const Twine &Msg) const { return Error(getLoc(), Msg); }
     65 
     66     void Warning(LocTy WarningLoc, const Twine &Msg) const;
     67     void Warning(const Twine &Msg) const { return Warning(getLoc(), Msg); }
     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 LexDollar();
     82     lltok::Kind LexExclaim();
     83     lltok::Kind LexPercent();
     84     lltok::Kind LexVar(lltok::Kind Var, lltok::Kind VarID);
     85     lltok::Kind LexQuote();
     86     lltok::Kind Lex0x();
     87     lltok::Kind LexHash();
     88 
     89     uint64_t atoull(const char *Buffer, const char *End);
     90     uint64_t HexIntToVal(const char *Buffer, const char *End);
     91     void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);
     92     void FP80HexToIntPair(const char *Buff, const char *End, uint64_t Pair[2]);
     93   };
     94 } // end namespace llvm
     95 
     96 #endif
     97