LLLexer.h revision 193323 
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
22namespace 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
85