LLLexer.h revision cd81d94322a39503e4a3e87b6ee03d4fcb3465fb 
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/APFloat.h"
19#include "llvm/ADT/APSInt.h"
20#include "llvm/Support/SourceMgr.h"
21#include <string>
22
23namespace 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  public:
46    explicit LLLexer(MemoryBuffer *StartBuf, SourceMgr &SM, SMDiagnostic &,
47                     LLVMContext &C);
48    ~LLLexer() {}
49
50    lltok::Kind Lex() {
51      return CurKind = LexToken();
52    }
53
54    typedef SMLoc LocTy;
55    LocTy getLoc() const { return SMLoc::getFromPointer(TokStart); }
56    lltok::Kind getKind() const { return CurKind; }
57    const std::string &getStrVal() const { return StrVal; }
58    Type *getTyVal() const { return TyVal; }
59    unsigned getUIntVal() const { return UIntVal; }
60    const APSInt &getAPSIntVal() const { return APSIntVal; }
61    const APFloat &getAPFloatVal() const { return APFloatVal; }
62
63
64    bool Error(LocTy L, const Twine &Msg) const;
65    bool Error(const Twine &Msg) const { return Error(getLoc(), Msg); }
66
67    void Warning(LocTy WarningLoc, const Twine &Msg) const;
68    void Warning(const Twine &Msg) const { return Warning(getLoc(), Msg); }
69
70    std::string getFilename() const;
71
72  private:
73    lltok::Kind LexToken();
74
75    int getNextChar();
76    void SkipLineComment();
77    lltok::Kind ReadString(lltok::Kind kind);
78    bool ReadVarName();
79
80    lltok::Kind LexIdentifier();
81    lltok::Kind LexDigitOrNegative();
82    lltok::Kind LexPositive();
83    lltok::Kind LexAt();
84    lltok::Kind LexDollar();
85    lltok::Kind LexExclaim();
86    lltok::Kind LexPercent();
87    lltok::Kind LexQuote();
88    lltok::Kind Lex0x();
89    lltok::Kind LexHash();
90
91    uint64_t atoull(const char *Buffer, const char *End);
92    uint64_t HexIntToVal(const char *Buffer, const char *End);
93    void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);
94    void FP80HexToIntPair(const char *Buff, const char *End, uint64_t Pair[2]);
95  };
96} // end namespace llvm
97
98#endif
99