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, Defset, 48 49 // !keywords. 50 XConcat, XADD, XAND, XOR, XSRA, XSRL, XSHL, XListConcat, XStrConcat, XCast, 51 XSubst, XForEach, XFoldl, XHead, XTail, XSize, XEmpty, XIf, XEq, XIsA, XDag, 52 XNe, XLe, XLt, XGe, XGt, 53 54 // Integer value. 55 IntVal, 56 57 // Binary constant. Note that these are sized according to the number of 58 // bits given. 59 BinaryIntVal, 60 61 // String valued tokens. 62 Id, StrVal, VarName, CodeFragment 63 }; 64 } 65 66 /// TGLexer - TableGen Lexer class. 67 class TGLexer { 68 SourceMgr &SrcMgr; 69 70 const char *CurPtr; 71 StringRef CurBuf; 72 73 // Information about the current token. 74 const char *TokStart; 75 tgtok::TokKind CurCode; 76 std::string CurStrVal; // This is valid for ID, STRVAL, VARNAME, CODEFRAGMENT 77 int64_t CurIntVal; // This is valid for INTVAL. 78 79 /// CurBuffer - This is the current buffer index we're lexing from as managed 80 /// by the SourceMgr object. 81 unsigned CurBuffer; 82 83 public: 84 typedef std::map<std::string, SMLoc> DependenciesMapTy; 85 private: 86 /// Dependencies - This is the list of all included files. 87 DependenciesMapTy Dependencies; 88 89 public: 90 TGLexer(SourceMgr &SrcMgr); 91 92 tgtok::TokKind Lex() { 93 return CurCode = LexToken(); 94 } 95 96 const DependenciesMapTy &getDependencies() const { 97 return Dependencies; 98 } 99 100 tgtok::TokKind getCode() const { return CurCode; } 101 102 const std::string &getCurStrVal() const { 103 assert((CurCode == tgtok::Id || CurCode == tgtok::StrVal || 104 CurCode == tgtok::VarName || CurCode == tgtok::CodeFragment) && 105 "This token doesn't have a string value"); 106 return CurStrVal; 107 } 108 int64_t getCurIntVal() const { 109 assert(CurCode == tgtok::IntVal && "This token isn't an integer"); 110 return CurIntVal; 111 } 112 std::pair<int64_t, unsigned> getCurBinaryIntVal() const { 113 assert(CurCode == tgtok::BinaryIntVal && 114 "This token isn't a binary integer"); 115 return std::make_pair(CurIntVal, (CurPtr - TokStart)-2); 116 } 117 118 SMLoc getLoc() const; 119 120 private: 121 /// LexToken - Read the next token and return its code. 122 tgtok::TokKind LexToken(); 123 124 tgtok::TokKind ReturnError(const char *Loc, const Twine &Msg); 125 126 int getNextChar(); 127 int peekNextChar(int Index); 128 void SkipBCPLComment(); 129 bool SkipCComment(); 130 tgtok::TokKind LexIdentifier(); 131 bool LexInclude(); 132 tgtok::TokKind LexString(); 133 tgtok::TokKind LexVarName(); 134 tgtok::TokKind LexNumber(); 135 tgtok::TokKind LexBracket(); 136 tgtok::TokKind LexExclaim(); 137 }; 138 139 } // end namespace llvm 140 141 #endif 142
