utils/TableGen/TGParser.h

   1 //===- TGParser.h - Parser 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 Parser for tablegen files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef TGPARSER_H
  15 #define TGPARSER_H
  16
  17 #include "TGLexer.h"
  18 #include <map>
  19
  20 namespace llvm {
  21   class Record;
  22   class RecordVal;
  23   class RecTy;
  24   class Init;
  25   struct MultiClass;
  26   struct SubClassReference;
  27
  28   struct LetRecord {
  29     std::string Name;
  30     std::vector<unsigned> Bits;
  31     Init *Value;
  32     TGLexer::LocTy Loc;
  33     LetRecord(const std::string &N, const std::vector<unsigned> &B, Init *V,
  34               TGLexer::LocTy L)
  35       : Name(N), Bits(B), Value(V), Loc(L) {
  36     }
  37   };
  38
  39 class TGParser {
  40   TGLexer Lex;
  41   std::vector<std::vector<LetRecord> > LetStack;
  42   std::map<std::string, MultiClass*> MultiClasses;
  43
  44   /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the
  45   /// current value.
  46   MultiClass *CurMultiClass;
  47 public:
  48   typedef TGLexer::LocTy LocTy;
  49
  50   TGParser(MemoryBuffer *StartBuf) : Lex(StartBuf), CurMultiClass(0) {}
  51
  52   void setIncludeDirs(const std::vector<std::string> &D){Lex.setIncludeDirs(D);}
  53
  54   /// ParseFile - Main entrypoint for parsing a tblgen file.  These parser
  55   /// routines return true on error, or false on success.
  56   bool ParseFile();
  57
  58   bool Error(LocTy L, const std::string &Msg) const {
  59     Lex.PrintError(L, Msg);
  60     return true;
  61   }
  62   bool TokError(const std::string &Msg) const {
  63     return Error(Lex.getLoc(), Msg);
  64   }
  65 private:  // Semantic analysis methods.
  66   bool AddValue(Record *TheRec, LocTy Loc, const RecordVal &RV);
  67   bool SetValue(Record *TheRec, LocTy Loc, const std::string &ValName,
  68                 const std::vector<unsigned> &BitList, Init *V);
  69   bool AddSubClass(Record *Rec, class SubClassReference &SubClass);
  70
  71 private:  // Parser methods.
  72   bool ParseObjectList();
  73   bool ParseObject();
  74   bool ParseClass();
  75   bool ParseMultiClass();
  76   bool ParseMultiClassDef(MultiClass *CurMC);
  77   bool ParseDefm();
  78   bool ParseTopLevelLet();
  79   std::vector<LetRecord> ParseLetList();
  80
  81   Record *ParseDef(MultiClass *CurMultiClass);
  82   bool ParseObjectBody(Record *CurRec);
  83   bool ParseBody(Record *CurRec);
  84   bool ParseBodyItem(Record *CurRec);
  85
  86   bool ParseTemplateArgList(Record *CurRec);
  87   std::string ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs);
  88
  89   SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm);
  90
  91   Init *ParseIDValue(Record *CurRec);
  92   Init *ParseIDValue(Record *CurRec, const std::string &Name, LocTy NameLoc);
  93   Init *ParseSimpleValue(Record *CurRec);
  94   Init *ParseValue(Record *CurRec);
  95   std::vector<Init*> ParseValueList(Record *CurRec);
  96   std::vector<std::pair<llvm::Init*, std::string> > ParseDagArgList(Record *);
  97   bool ParseOptionalRangeList(std::vector<unsigned> &Ranges);
  98   bool ParseOptionalBitList(std::vector<unsigned> &Ranges);
  99   std::vector<unsigned> ParseRangeList();
 100   bool ParseRangePiece(std::vector<unsigned> &Ranges);
 101   RecTy *ParseType();
 102   std::string ParseObjectName();
 103   Record *ParseClassID();
 104   Record *ParseDefmID();
 105 };
 106
 107 } // end namespace llvm
 108
 109 #endif