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 
Lex()49     lltok::Kind Lex() {
50       return CurKind = LexToken();
51     }
52 
53     typedef SMLoc LocTy;
getLoc()54     LocTy getLoc() const { return SMLoc::getFromPointer(TokStart); }
getKind()55     lltok::Kind getKind() const { return CurKind; }
getStrVal()56     const std::string &getStrVal() const { return StrVal; }
getTyVal()57     Type *getTyVal() const { return TyVal; }
getUIntVal()58     unsigned getUIntVal() const { return UIntVal; }
getAPSIntVal()59     const APSInt &getAPSIntVal() const { return APSIntVal; }
getAPFloatVal()60     const APFloat &getAPFloatVal() const { return APFloatVal; }
61 
62 
63     bool Error(LocTy L, const Twine &Msg) const;
Error(const Twine & Msg)64     bool Error(const Twine &Msg) const { return Error(getLoc(), Msg); }
65 
66     void Warning(LocTy WarningLoc, const Twine &Msg) const;
Warning(const Twine & Msg)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