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Diffstat (limited to 'llvm/lib/TableGen/TGParser.h')
| -rw-r--r-- | llvm/lib/TableGen/TGParser.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/llvm/lib/TableGen/TGParser.h b/llvm/lib/TableGen/TGParser.h new file mode 100644 index 000000000000..af2b639f8d59 --- /dev/null +++ b/llvm/lib/TableGen/TGParser.h @@ -0,0 +1,208 @@ +//===- TGParser.h - Parser for TableGen Files -------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// +// This class represents the Parser for tablegen files. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_TABLEGEN_TGPARSER_H +#define LLVM_LIB_TABLEGEN_TGPARSER_H + +#include "TGLexer.h" +#include "llvm/ADT/Twine.h" +#include "llvm/Support/SourceMgr.h" +#include "llvm/TableGen/Error.h" +#include "llvm/TableGen/Record.h" +#include <map> + +namespace llvm { + class Record; + class RecordVal; + class RecordKeeper; + class RecTy; + class Init; + struct ForeachLoop; + struct MultiClass; + struct SubClassReference; + struct SubMultiClassReference; + + struct LetRecord { + StringInit *Name; + std::vector<unsigned> Bits; + Init *Value; + SMLoc Loc; + LetRecord(StringInit *N, ArrayRef<unsigned> B, Init *V, SMLoc L) + : Name(N), Bits(B), Value(V), Loc(L) { + } + }; + + /// RecordsEntry - Can be either a record or a foreach loop. + struct RecordsEntry { + std::unique_ptr<Record> Rec; + std::unique_ptr<ForeachLoop> Loop; + + void dump() const; + + RecordsEntry() {} + RecordsEntry(std::unique_ptr<Record> Rec) : Rec(std::move(Rec)) {} + RecordsEntry(std::unique_ptr<ForeachLoop> Loop) + : Loop(std::move(Loop)) {} + }; + + /// ForeachLoop - Record the iteration state associated with a for loop. + /// This is used to instantiate items in the loop body. + struct ForeachLoop { + SMLoc Loc; + VarInit *IterVar; + Init *ListValue; + std::vector<RecordsEntry> Entries; + + void dump() const; + + ForeachLoop(SMLoc Loc, VarInit *IVar, Init *LValue) + : Loc(Loc), IterVar(IVar), ListValue(LValue) {} + }; + + struct DefsetRecord { + SMLoc Loc; + RecTy *EltTy; + SmallVector<Init *, 16> Elements; + }; + +struct MultiClass { + Record Rec; // Placeholder for template args and Name. + std::vector<RecordsEntry> Entries; + + void dump() const; + + MultiClass(StringRef Name, SMLoc Loc, RecordKeeper &Records) : + Rec(Name, Loc, Records) {} +}; + +class TGParser { + TGLexer Lex; + std::vector<SmallVector<LetRecord, 4>> LetStack; + std::map<std::string, std::unique_ptr<MultiClass>> MultiClasses; + + /// Loops - Keep track of any foreach loops we are within. + /// + std::vector<std::unique_ptr<ForeachLoop>> Loops; + + SmallVector<DefsetRecord *, 2> Defsets; + + /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the + /// current value. + MultiClass *CurMultiClass; + + // Record tracker + RecordKeeper &Records; + + // A "named boolean" indicating how to parse identifiers. Usually + // identifiers map to some existing object but in special cases + // (e.g. parsing def names) no such object exists yet because we are + // in the middle of creating in. For those situations, allow the + // parser to ignore missing object errors. + enum IDParseMode { + ParseValueMode, // We are parsing a value we expect to look up. + ParseNameMode, // We are parsing a name of an object that does not yet + // exist. + }; + +public: + TGParser(SourceMgr &SrcMgr, ArrayRef<std::string> Macros, + RecordKeeper &records) + : Lex(SrcMgr, Macros), CurMultiClass(nullptr), Records(records) {} + + /// ParseFile - Main entrypoint for parsing a tblgen file. These parser + /// routines return true on error, or false on success. + bool ParseFile(); + + bool Error(SMLoc L, const Twine &Msg) const { + PrintError(L, Msg); + return true; + } + bool TokError(const Twine &Msg) const { + return Error(Lex.getLoc(), Msg); + } + const TGLexer::DependenciesMapTy &getDependencies() const { + return Lex.getDependencies(); + } + +private: // Semantic analysis methods. + bool AddValue(Record *TheRec, SMLoc Loc, const RecordVal &RV); + bool SetValue(Record *TheRec, SMLoc Loc, Init *ValName, + ArrayRef<unsigned> BitList, Init *V, + bool AllowSelfAssignment = false); + bool AddSubClass(Record *Rec, SubClassReference &SubClass); + bool AddSubClass(RecordsEntry &Entry, SubClassReference &SubClass); + bool AddSubMultiClass(MultiClass *CurMC, + SubMultiClassReference &SubMultiClass); + + using SubstStack = SmallVector<std::pair<Init *, Init *>, 8>; + + bool addEntry(RecordsEntry E); + bool resolve(const ForeachLoop &Loop, SubstStack &Stack, bool Final, + std::vector<RecordsEntry> *Dest, SMLoc *Loc = nullptr); + bool resolve(const std::vector<RecordsEntry> &Source, SubstStack &Substs, + bool Final, std::vector<RecordsEntry> *Dest, + SMLoc *Loc = nullptr); + bool addDefOne(std::unique_ptr<Record> Rec); + +private: // Parser methods. + bool ParseObjectList(MultiClass *MC = nullptr); + bool ParseObject(MultiClass *MC); + bool ParseClass(); + bool ParseMultiClass(); + bool ParseDefm(MultiClass *CurMultiClass); + bool ParseDef(MultiClass *CurMultiClass); + bool ParseDefset(); + bool ParseForeach(MultiClass *CurMultiClass); + bool ParseTopLevelLet(MultiClass *CurMultiClass); + void ParseLetList(SmallVectorImpl<LetRecord> &Result); + + bool ParseObjectBody(Record *CurRec); + bool ParseBody(Record *CurRec); + bool ParseBodyItem(Record *CurRec); + + bool ParseTemplateArgList(Record *CurRec); + Init *ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs); + VarInit *ParseForeachDeclaration(Init *&ForeachListValue); + + SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm); + SubMultiClassReference ParseSubMultiClassReference(MultiClass *CurMC); + + Init *ParseIDValue(Record *CurRec, StringInit *Name, SMLoc NameLoc, + IDParseMode Mode = ParseValueMode); + Init *ParseSimpleValue(Record *CurRec, RecTy *ItemType = nullptr, + IDParseMode Mode = ParseValueMode); + Init *ParseValue(Record *CurRec, RecTy *ItemType = nullptr, + IDParseMode Mode = ParseValueMode); + void ParseValueList(SmallVectorImpl<llvm::Init*> &Result, Record *CurRec, + Record *ArgsRec = nullptr, RecTy *EltTy = nullptr); + void ParseDagArgList( + SmallVectorImpl<std::pair<llvm::Init*, StringInit*>> &Result, + Record *CurRec); + bool ParseOptionalRangeList(SmallVectorImpl<unsigned> &Ranges); + bool ParseOptionalBitList(SmallVectorImpl<unsigned> &Ranges); + void ParseRangeList(SmallVectorImpl<unsigned> &Result); + bool ParseRangePiece(SmallVectorImpl<unsigned> &Ranges, + TypedInit *FirstItem = nullptr); + RecTy *ParseType(); + Init *ParseOperation(Record *CurRec, RecTy *ItemType); + Init *ParseOperationCond(Record *CurRec, RecTy *ItemType); + RecTy *ParseOperatorType(); + Init *ParseObjectName(MultiClass *CurMultiClass); + Record *ParseClassID(); + MultiClass *ParseMultiClassID(); + bool ApplyLetStack(Record *CurRec); + bool ApplyLetStack(RecordsEntry &Entry); +}; + +} // end namespace llvm + +#endif |