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1 //===- TGLexer.h - Lexer for TableGen 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 tablegen files.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TABLEGEN_TGLEXER_H
15 #define LLVM_LIB_TABLEGEN_TGLEXER_H
16 
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/Support/DataTypes.h"
19 #include "llvm/Support/SMLoc.h"
20 #include <cassert>
21 #include <map>
22 #include <string>
23 
24 namespace llvm {
25 class SourceMgr;
26 class SMLoc;
27 class Twine;
28 
29 namespace tgtok {
30   enum TokKind {
31     // Markers
32     Eof, Error,
33 
34     // Tokens with no info.
35     minus, plus,        // - +
36     l_square, r_square, // [ ]
37     l_brace, r_brace,   // { }
38     l_paren, r_paren,   // ( )
39     less, greater,      // < >
40     colon, semi,        // : ;
41     comma, period,      // , .
42     equal, question,    // = ?
43     paste,              // #
44 
45     // Keywords.
46     Bit, Bits, Class, Code, Dag, Def, Foreach, Defm, Field, In, Int, Let, List,
47     MultiClass, String,
48 
49     // !keywords.
50     XConcat, XADD, XAND, XSRA, XSRL, XSHL, XListConcat, XStrConcat, XCast,
51     XSubst, XForEach, XHead, XTail, XEmpty, XIf, XEq,
52 
53     // Integer value.
54     IntVal,
55 
56     // Binary constant.  Note that these are sized according to the number of
57     // bits given.
58     BinaryIntVal,
59 
60     // String valued tokens.
61     Id, StrVal, VarName, CodeFragment
62   };
63 }
64 
65 /// TGLexer - TableGen Lexer class.
66 class TGLexer {
67   SourceMgr &SrcMgr;
68 
69   const char *CurPtr;
70   StringRef CurBuf;
71 
72   // Information about the current token.
73   const char *TokStart;
74   tgtok::TokKind CurCode;
75   std::string CurStrVal;  // This is valid for ID, STRVAL, VARNAME, CODEFRAGMENT
76   int64_t CurIntVal;      // This is valid for INTVAL.
77 
78   /// CurBuffer - This is the current buffer index we're lexing from as managed
79   /// by the SourceMgr object.
80   unsigned CurBuffer;
81 
82 public:
83   typedef std::map<std::string, SMLoc> DependenciesMapTy;
84 private:
85   /// Dependencies - This is the list of all included files.
86   DependenciesMapTy Dependencies;
87 
88 public:
89   TGLexer(SourceMgr &SrcMgr);
90 
Lex()91   tgtok::TokKind Lex() {
92     return CurCode = LexToken();
93   }
94 
getDependencies()95   const DependenciesMapTy &getDependencies() const {
96     return Dependencies;
97   }
98 
getCode()99   tgtok::TokKind getCode() const { return CurCode; }
100 
getCurStrVal()101   const std::string &getCurStrVal() const {
102     assert((CurCode == tgtok::Id || CurCode == tgtok::StrVal ||
103             CurCode == tgtok::VarName || CurCode == tgtok::CodeFragment) &&
104            "This token doesn't have a string value");
105     return CurStrVal;
106   }
getCurIntVal()107   int64_t getCurIntVal() const {
108     assert(CurCode == tgtok::IntVal && "This token isn't an integer");
109     return CurIntVal;
110   }
getCurBinaryIntVal()111   std::pair<int64_t, unsigned> getCurBinaryIntVal() const {
112     assert(CurCode == tgtok::BinaryIntVal &&
113            "This token isn't a binary integer");
114     return std::make_pair(CurIntVal, (CurPtr - TokStart)-2);
115   }
116 
117   SMLoc getLoc() const;
118 
119 private:
120   /// LexToken - Read the next token and return its code.
121   tgtok::TokKind LexToken();
122 
123   tgtok::TokKind ReturnError(const char *Loc, const Twine &Msg);
124 
125   int getNextChar();
126   int peekNextChar(int Index);
127   void SkipBCPLComment();
128   bool SkipCComment();
129   tgtok::TokKind LexIdentifier();
130   bool LexInclude();
131   tgtok::TokKind LexString();
132   tgtok::TokKind LexVarName();
133   tgtok::TokKind LexNumber();
134   tgtok::TokKind LexBracket();
135   tgtok::TokKind LexExclaim();
136 };
137 
138 } // end namespace llvm
139 
140 #endif
141