LCOV - code coverage report
Current view: top level - lib/TableGen - TGParser.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 12 15 80.0 %
Date: 2018-09-23 13:06:45 Functions: 2 3 66.7 %
Legend: Lines: hit not hit

          Line data    Source code
       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 LLVM_LIB_TABLEGEN_TGPARSER_H
      15             : #define LLVM_LIB_TABLEGEN_TGPARSER_H
      16             : 
      17             : #include "TGLexer.h"
      18             : #include "llvm/ADT/Twine.h"
      19             : #include "llvm/Support/SourceMgr.h"
      20             : #include "llvm/TableGen/Error.h"
      21             : #include "llvm/TableGen/Record.h"
      22             : #include <map>
      23             : 
      24             : namespace llvm {
      25             :   class Record;
      26             :   class RecordVal;
      27             :   class RecordKeeper;
      28             :   class RecTy;
      29             :   class Init;
      30             :   struct ForeachLoop;
      31             :   struct MultiClass;
      32             :   struct SubClassReference;
      33             :   struct SubMultiClassReference;
      34             : 
      35      875401 :   struct LetRecord {
      36             :     StringInit *Name;
      37             :     std::vector<unsigned> Bits;
      38             :     Init *Value;
      39             :     SMLoc Loc;
      40             :     LetRecord(StringInit *N, ArrayRef<unsigned> B, Init *V, SMLoc L)
      41      128188 :       : Name(N), Bits(B), Value(V), Loc(L) {
      42             :     }
      43             :   };
      44             : 
      45             :   /// RecordsEntry - Can be either a record or a foreach loop.
      46     6564216 :   struct RecordsEntry {
      47             :     std::unique_ptr<Record> Rec;
      48             :     std::unique_ptr<ForeachLoop> Loop;
      49             : 
      50             :     void dump() const;
      51             : 
      52             :     RecordsEntry() {}
      53             :     RecordsEntry(std::unique_ptr<Record> Rec) : Rec(std::move(Rec)) {}
      54             :     RecordsEntry(std::unique_ptr<ForeachLoop> Loop)
      55         290 :       : Loop(std::move(Loop)) {}
      56             :   };
      57             : 
      58             :   /// ForeachLoop - Record the iteration state associated with a for loop.
      59             :   /// This is used to instantiate items in the loop body.
      60        3620 :   struct ForeachLoop {
      61             :     SMLoc Loc;
      62             :     VarInit *IterVar;
      63             :     Init *ListValue;
      64             :     std::vector<RecordsEntry> Entries;
      65             : 
      66             :     void dump() const;
      67             : 
      68             :     ForeachLoop(SMLoc Loc, VarInit *IVar, Init *LValue)
      69        3620 :       : Loc(Loc), IterVar(IVar), ListValue(LValue) {}
      70             :   };
      71             : 
      72             :   struct DefsetRecord {
      73             :     SMLoc Loc;
      74             :     RecTy *EltTy;
      75             :     SmallVector<Init *, 16> Elements;
      76             :   };
      77             : 
      78           0 : struct MultiClass {
      79             :   Record Rec;  // Placeholder for template args and Name.
      80             :   std::vector<RecordsEntry> Entries;
      81             : 
      82             :   void dump() const;
      83             : 
      84       31689 :   MultiClass(StringRef Name, SMLoc Loc, RecordKeeper &Records) :
      85       31689 :     Rec(Name, Loc, Records) {}
      86             : };
      87             : 
      88             : class TGParser {
      89             :   TGLexer Lex;
      90             :   std::vector<SmallVector<LetRecord, 4>> LetStack;
      91             :   std::map<std::string, std::unique_ptr<MultiClass>> MultiClasses;
      92             : 
      93             :   /// Loops - Keep track of any foreach loops we are within.
      94             :   ///
      95             :   std::vector<std::unique_ptr<ForeachLoop>> Loops;
      96             : 
      97             :   SmallVector<DefsetRecord *, 2> Defsets;
      98             : 
      99             :   /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the
     100             :   /// current value.
     101             :   MultiClass *CurMultiClass;
     102             : 
     103             :   // Record tracker
     104             :   RecordKeeper &Records;
     105             : 
     106             :   // A "named boolean" indicating how to parse identifiers.  Usually
     107             :   // identifiers map to some existing object but in special cases
     108             :   // (e.g. parsing def names) no such object exists yet because we are
     109             :   // in the middle of creating in.  For those situations, allow the
     110             :   // parser to ignore missing object errors.
     111             :   enum IDParseMode {
     112             :     ParseValueMode,   // We are parsing a value we expect to look up.
     113             :     ParseNameMode,    // We are parsing a name of an object that does not yet
     114             :                       // exist.
     115             :   };
     116             : 
     117             : public:
     118             :   TGParser(SourceMgr &SrcMgr, RecordKeeper &records)
     119         350 :       : Lex(SrcMgr), CurMultiClass(nullptr), Records(records) {}
     120             : 
     121             :   /// ParseFile - Main entrypoint for parsing a tblgen file.  These parser
     122             :   /// routines return true on error, or false on success.
     123             :   bool ParseFile();
     124             : 
     125           0 :   bool Error(SMLoc L, const Twine &Msg) const {
     126          11 :     PrintError(L, Msg);
     127           0 :     return true;
     128             :   }
     129           1 :   bool TokError(const Twine &Msg) const {
     130           1 :     return Error(Lex.getLoc(), Msg);
     131             :   }
     132             :   const TGLexer::DependenciesMapTy &getDependencies() const {
     133             :     return Lex.getDependencies();
     134             :   }
     135             : 
     136             : private:  // Semantic analysis methods.
     137             :   bool AddValue(Record *TheRec, SMLoc Loc, const RecordVal &RV);
     138             :   bool SetValue(Record *TheRec, SMLoc Loc, Init *ValName,
     139             :                 ArrayRef<unsigned> BitList, Init *V,
     140             :                 bool AllowSelfAssignment = false);
     141             :   bool AddSubClass(Record *Rec, SubClassReference &SubClass);
     142             :   bool AddSubClass(RecordsEntry &Entry, SubClassReference &SubClass);
     143             :   bool AddSubMultiClass(MultiClass *CurMC,
     144             :                         SubMultiClassReference &SubMultiClass);
     145             : 
     146             :   using SubstStack = SmallVector<std::pair<Init *, Init *>, 8>;
     147             : 
     148             :   bool addEntry(RecordsEntry E);
     149             :   bool resolve(const ForeachLoop &Loop, SubstStack &Stack, bool Final,
     150             :                std::vector<RecordsEntry> *Dest, SMLoc *Loc = nullptr);
     151             :   bool resolve(const std::vector<RecordsEntry> &Source, SubstStack &Substs,
     152             :                bool Final, std::vector<RecordsEntry> *Dest,
     153             :                SMLoc *Loc = nullptr);
     154             :   bool addDefOne(std::unique_ptr<Record> Rec);
     155             : 
     156             : private:  // Parser methods.
     157             :   bool ParseObjectList(MultiClass *MC = nullptr);
     158             :   bool ParseObject(MultiClass *MC);
     159             :   bool ParseClass();
     160             :   bool ParseMultiClass();
     161             :   bool ParseDefm(MultiClass *CurMultiClass);
     162             :   bool ParseDef(MultiClass *CurMultiClass);
     163             :   bool ParseDefset();
     164             :   bool ParseForeach(MultiClass *CurMultiClass);
     165             :   bool ParseTopLevelLet(MultiClass *CurMultiClass);
     166             :   void ParseLetList(SmallVectorImpl<LetRecord> &Result);
     167             : 
     168             :   bool ParseObjectBody(Record *CurRec);
     169             :   bool ParseBody(Record *CurRec);
     170             :   bool ParseBodyItem(Record *CurRec);
     171             : 
     172             :   bool ParseTemplateArgList(Record *CurRec);
     173             :   Init *ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs);
     174             :   VarInit *ParseForeachDeclaration(Init *&ForeachListValue);
     175             : 
     176             :   SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm);
     177             :   SubMultiClassReference ParseSubMultiClassReference(MultiClass *CurMC);
     178             : 
     179             :   Init *ParseIDValue(Record *CurRec, StringInit *Name, SMLoc NameLoc,
     180             :                      IDParseMode Mode = ParseValueMode);
     181             :   Init *ParseSimpleValue(Record *CurRec, RecTy *ItemType = nullptr,
     182             :                          IDParseMode Mode = ParseValueMode);
     183             :   Init *ParseValue(Record *CurRec, RecTy *ItemType = nullptr,
     184             :                    IDParseMode Mode = ParseValueMode);
     185             :   void ParseValueList(SmallVectorImpl<llvm::Init*> &Result, Record *CurRec,
     186             :                       Record *ArgsRec = nullptr, RecTy *EltTy = nullptr);
     187             :   void ParseDagArgList(
     188             :       SmallVectorImpl<std::pair<llvm::Init*, StringInit*>> &Result,
     189             :       Record *CurRec);
     190             :   bool ParseOptionalRangeList(SmallVectorImpl<unsigned> &Ranges);
     191             :   bool ParseOptionalBitList(SmallVectorImpl<unsigned> &Ranges);
     192             :   void ParseRangeList(SmallVectorImpl<unsigned> &Result);
     193             :   bool ParseRangePiece(SmallVectorImpl<unsigned> &Ranges);
     194             :   RecTy *ParseType();
     195             :   Init *ParseOperation(Record *CurRec, RecTy *ItemType);
     196             :   RecTy *ParseOperatorType();
     197             :   Init *ParseObjectName(MultiClass *CurMultiClass);
     198             :   Record *ParseClassID();
     199             :   MultiClass *ParseMultiClassID();
     200             :   bool ApplyLetStack(Record *CurRec);
     201             :   bool ApplyLetStack(RecordsEntry &Entry);
     202             : };
     203             : 
     204             : } // end namespace llvm
     205             : 
     206             : #endif

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