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 "llvm/Support/SourceMgr.h"
  19 #include <map>
  20
  21 namespace llvm {
  22   class Record;
  23   class RecordVal;
  24   struct RecTy;
  25   struct Init;
  26   struct MultiClass;
  27   struct SubClassReference;
  28   struct SubMultiClassReference;
  29
  30   struct LetRecord {
  31     std::string Name;
  32     std::vector<unsigned> Bits;
  33     Init *Value;
  34     SMLoc Loc;
  35     LetRecord(const std::string &N, const std::vector<unsigned> &B, Init *V,
  36               SMLoc L)
  37       : Name(N), Bits(B), Value(V), Loc(L) {
  38     }
  39   };
  40
  41 class TGParser {
  42   TGLexer Lex;
  43   std::vector<std::vector<LetRecord> > LetStack;
  44   std::map<std::string, MultiClass*> MultiClasses;
  45
  46   /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the
  47   /// current value.
  48   MultiClass *CurMultiClass;
  49 public:
  50   TGParser(SourceMgr &SrcMgr) : Lex(SrcMgr), CurMultiClass(0) {}
  51
  52   /// ParseFile - Main entrypoint for parsing a tblgen file.  These parser
  53   /// routines return true on error, or false on success.
  54   bool ParseFile();
  55
  56   bool Error(SMLoc L, const std::string &Msg) const {
  57     Lex.PrintError(L, Msg);
  58     return true;
  59   }
  60   bool TokError(const std::string &Msg) const {
  61     return Error(Lex.getLoc(), Msg);
  62   }
  63 private:  // Semantic analysis methods.
  64   bool AddValue(Record *TheRec, SMLoc Loc, const RecordVal &RV);
  65   bool SetValue(Record *TheRec, SMLoc Loc, const std::string &ValName,
  66                 const std::vector<unsigned> &BitList, Init *V);
  67   bool AddSubClass(Record *Rec, SubClassReference &SubClass);
  68   bool AddSubMultiClass(MultiClass *CurMC,
  69                         SubMultiClassReference &SubMultiClass);
  70
  71 private:  // Parser methods.
  72   bool ParseObjectList(MultiClass *MC = 0);
  73   bool ParseObject(MultiClass *MC);
  74   bool ParseClass();
  75   bool ParseMultiClass();
  76   bool ParseDefm(MultiClass *CurMultiClass);
  77   bool ParseDef(MultiClass *CurMultiClass);
  78   bool ParseTopLevelLet(MultiClass *CurMultiClass);
  79   std::vector<LetRecord> ParseLetList();
  80
  81   bool ParseObjectBody(Record *CurRec);
  82   bool ParseBody(Record *CurRec);
  83   bool ParseBodyItem(Record *CurRec);
  84
  85   bool ParseTemplateArgList(Record *CurRec);
  86   std::string ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs);
  87
  88   SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm);
  89   SubMultiClassReference ParseSubMultiClassReference(MultiClass *CurMC);
  90
  91   Init *ParseIDValue(Record *CurRec);
  92   Init *ParseIDValue(Record *CurRec, const std::string &Name, SMLoc NameLoc);
  93   Init *ParseSimpleValue(Record *CurRec, RecTy *ItemType = 0);
  94   Init *ParseValue(Record *CurRec, RecTy *ItemType = 0);
  95   std::vector<Init*> ParseValueList(Record *CurRec, Record *ArgsRec = 0, RecTy *EltTy = 0);
  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   Init *ParseOperation(Record *CurRec);
 103   RecTy *ParseOperatorType();
 104   std::string ParseObjectName();
 105   Record *ParseClassID();
 106   MultiClass *ParseMultiClassID();
 107   Record *ParseDefmID();
 108 };
 109
 110 } // end namespace llvm
 111
 112 #endif