LLLexer.h revision 48b2f3e4850cd27d54224cd42da8a160d6b95984 
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
23namespace llvm {
24  class MemoryBuffer;
25  class Type;
26  class SMDiagnostic;
27  struct 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    const 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    const 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 std::string &Msg) const;
66    bool Error(const std::string &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 LexIdentifier();
75    lltok::Kind LexDigitOrNegative();
76    lltok::Kind LexPositive();
77    lltok::Kind LexAt();
78    lltok::Kind LexMetadata();
79    lltok::Kind LexPercent();
80    lltok::Kind LexQuote();
81    lltok::Kind Lex0x();
82
83    uint64_t atoull(const char *Buffer, const char *End);
84    uint64_t HexIntToVal(const char *Buffer, const char *End);
85    void HexToIntPair(const char *Buffer, const char *End, uint64_t Pair[2]);
86    void FP80HexToIntPair(const char *Buff, const char *End, uint64_t Pair[2]);
87  };
88} // end namespace llvm
89
90#endif
91