1 //===- TGParser.h - Parser for TableGen Files -------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This class represents the Parser for tablegen files. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TABLEGEN_TGPARSER_H 14 #define LLVM_LIB_TABLEGEN_TGPARSER_H 15 16 #include "TGLexer.h" 17 #include "llvm/TableGen/Error.h" 18 #include "llvm/TableGen/Record.h" 19 #include <map> 20 21 namespace llvm { 22 class SourceMgr; 23 class Twine; 24 struct ForeachLoop; 25 struct MultiClass; 26 struct SubClassReference; 27 struct SubMultiClassReference; 28 29 struct LetRecord { 30 StringInit *Name; 31 std::vector<unsigned> Bits; 32 Init *Value; 33 SMLoc Loc; 34 LetRecord(StringInit *N, ArrayRef<unsigned> B, Init *V, SMLoc L) 35 : Name(N), Bits(B), Value(V), Loc(L) { 36 } 37 }; 38 39 /// RecordsEntry - Holds exactly one of a Record, ForeachLoop, or 40 /// AssertionInfo. 41 struct RecordsEntry { 42 std::unique_ptr<Record> Rec; 43 std::unique_ptr<ForeachLoop> Loop; 44 std::unique_ptr<Record::AssertionInfo> Assertion; 45 46 void dump() const; 47 48 RecordsEntry() {} 49 RecordsEntry(std::unique_ptr<Record> Rec) : Rec(std::move(Rec)) {} 50 RecordsEntry(std::unique_ptr<ForeachLoop> Loop) 51 : Loop(std::move(Loop)) {} 52 RecordsEntry(std::unique_ptr<Record::AssertionInfo> Assertion) 53 : Assertion(std::move(Assertion)) {} 54 }; 55 56 /// ForeachLoop - Record the iteration state associated with a for loop. 57 /// This is used to instantiate items in the loop body. 58 /// 59 /// IterVar is allowed to be null, in which case no iteration variable is 60 /// defined in the loop at all. (This happens when a ForeachLoop is 61 /// constructed by desugaring an if statement.) 62 struct ForeachLoop { 63 SMLoc Loc; 64 VarInit *IterVar; 65 Init *ListValue; 66 std::vector<RecordsEntry> Entries; 67 68 void dump() const; 69 70 ForeachLoop(SMLoc Loc, VarInit *IVar, Init *LValue) 71 : Loc(Loc), IterVar(IVar), ListValue(LValue) {} 72 }; 73 74 struct DefsetRecord { 75 SMLoc Loc; 76 RecTy *EltTy = nullptr; 77 SmallVector<Init *, 16> Elements; 78 }; 79 80 class TGLocalVarScope { 81 // A scope to hold local variable definitions from defvar. 82 std::map<std::string, Init *, std::less<>> vars; 83 std::unique_ptr<TGLocalVarScope> parent; 84 85 public: 86 TGLocalVarScope() = default; 87 TGLocalVarScope(std::unique_ptr<TGLocalVarScope> parent) 88 : parent(std::move(parent)) {} 89 90 std::unique_ptr<TGLocalVarScope> extractParent() { 91 // This is expected to be called just before we are destructed, so 92 // it doesn't much matter what state we leave 'parent' in. 93 return std::move(parent); 94 } 95 96 Init *getVar(StringRef Name) const { 97 auto It = vars.find(Name); 98 if (It != vars.end()) 99 return It->second; 100 if (parent) 101 return parent->getVar(Name); 102 return nullptr; 103 } 104 105 bool varAlreadyDefined(StringRef Name) const { 106 // When we check whether a variable is already defined, for the purpose of 107 // reporting an error on redefinition, we don't look up to the parent 108 // scope, because it's all right to shadow an outer definition with an 109 // inner one. 110 return vars.find(Name) != vars.end(); 111 } 112 113 void addVar(StringRef Name, Init *I) { 114 bool Ins = vars.insert(std::make_pair(std::string(Name), I)).second; 115 (void)Ins; 116 assert(Ins && "Local variable already exists"); 117 } 118 }; 119 120 struct MultiClass { 121 Record Rec; // Placeholder for template args and Name. 122 std::vector<RecordsEntry> Entries; 123 124 void dump() const; 125 126 MultiClass(StringRef Name, SMLoc Loc, RecordKeeper &Records) : 127 Rec(Name, Loc, Records) {} 128 }; 129 130 class TGParser { 131 TGLexer Lex; 132 std::vector<SmallVector<LetRecord, 4>> LetStack; 133 std::map<std::string, std::unique_ptr<MultiClass>> MultiClasses; 134 135 /// Loops - Keep track of any foreach loops we are within. 136 /// 137 std::vector<std::unique_ptr<ForeachLoop>> Loops; 138 139 SmallVector<DefsetRecord *, 2> Defsets; 140 141 /// CurMultiClass - If we are parsing a 'multiclass' definition, this is the 142 /// current value. 143 MultiClass *CurMultiClass; 144 145 /// CurLocalScope - Innermost of the current nested scopes for 'defvar' local 146 /// variables. 147 std::unique_ptr<TGLocalVarScope> CurLocalScope; 148 149 // Record tracker 150 RecordKeeper &Records; 151 152 // A "named boolean" indicating how to parse identifiers. Usually 153 // identifiers map to some existing object but in special cases 154 // (e.g. parsing def names) no such object exists yet because we are 155 // in the middle of creating in. For those situations, allow the 156 // parser to ignore missing object errors. 157 enum IDParseMode { 158 ParseValueMode, // We are parsing a value we expect to look up. 159 ParseNameMode, // We are parsing a name of an object that does not yet 160 // exist. 161 }; 162 163 public: 164 TGParser(SourceMgr &SM, ArrayRef<std::string> Macros, 165 RecordKeeper &records) 166 : Lex(SM, Macros), CurMultiClass(nullptr), Records(records) {} 167 168 /// ParseFile - Main entrypoint for parsing a tblgen file. These parser 169 /// routines return true on error, or false on success. 170 bool ParseFile(); 171 172 bool Error(SMLoc L, const Twine &Msg) const { 173 PrintError(L, Msg); 174 return true; 175 } 176 bool TokError(const Twine &Msg) const { 177 return Error(Lex.getLoc(), Msg); 178 } 179 const TGLexer::DependenciesSetTy &getDependencies() const { 180 return Lex.getDependencies(); 181 } 182 183 TGLocalVarScope *PushLocalScope() { 184 CurLocalScope = std::make_unique<TGLocalVarScope>(std::move(CurLocalScope)); 185 // Returns a pointer to the new scope, so that the caller can pass it back 186 // to PopLocalScope which will check by assertion that the pushes and pops 187 // match up properly. 188 return CurLocalScope.get(); 189 } 190 void PopLocalScope(TGLocalVarScope *ExpectedStackTop) { 191 assert(ExpectedStackTop == CurLocalScope.get() && 192 "Mismatched pushes and pops of local variable scopes"); 193 CurLocalScope = CurLocalScope->extractParent(); 194 } 195 196 private: // Semantic analysis methods. 197 bool AddValue(Record *TheRec, SMLoc Loc, const RecordVal &RV); 198 bool SetValue(Record *TheRec, SMLoc Loc, Init *ValName, 199 ArrayRef<unsigned> BitList, Init *V, 200 bool AllowSelfAssignment = false); 201 bool AddSubClass(Record *Rec, SubClassReference &SubClass); 202 bool AddSubClass(RecordsEntry &Entry, SubClassReference &SubClass); 203 bool AddSubMultiClass(MultiClass *CurMC, 204 SubMultiClassReference &SubMultiClass); 205 206 using SubstStack = SmallVector<std::pair<Init *, Init *>, 8>; 207 208 bool addEntry(RecordsEntry E); 209 bool resolve(const ForeachLoop &Loop, SubstStack &Stack, bool Final, 210 std::vector<RecordsEntry> *Dest, SMLoc *Loc = nullptr); 211 bool resolve(const std::vector<RecordsEntry> &Source, SubstStack &Substs, 212 bool Final, std::vector<RecordsEntry> *Dest, 213 SMLoc *Loc = nullptr); 214 bool addDefOne(std::unique_ptr<Record> Rec); 215 216 private: // Parser methods. 217 bool consume(tgtok::TokKind K); 218 bool ParseObjectList(MultiClass *MC = nullptr); 219 bool ParseObject(MultiClass *MC); 220 bool ParseClass(); 221 bool ParseMultiClass(); 222 bool ParseDefm(MultiClass *CurMultiClass); 223 bool ParseDef(MultiClass *CurMultiClass); 224 bool ParseDefset(); 225 bool ParseDefvar(); 226 bool ParseForeach(MultiClass *CurMultiClass); 227 bool ParseIf(MultiClass *CurMultiClass); 228 bool ParseIfBody(MultiClass *CurMultiClass, StringRef Kind); 229 bool ParseAssert(MultiClass *CurMultiClass, Record *CurRec = nullptr); 230 bool ParseTopLevelLet(MultiClass *CurMultiClass); 231 void ParseLetList(SmallVectorImpl<LetRecord> &Result); 232 233 bool ParseObjectBody(Record *CurRec); 234 bool ParseBody(Record *CurRec); 235 bool ParseBodyItem(Record *CurRec); 236 237 bool ParseTemplateArgList(Record *CurRec); 238 Init *ParseDeclaration(Record *CurRec, bool ParsingTemplateArgs); 239 VarInit *ParseForeachDeclaration(Init *&ForeachListValue); 240 241 SubClassReference ParseSubClassReference(Record *CurRec, bool isDefm); 242 SubMultiClassReference ParseSubMultiClassReference(MultiClass *CurMC); 243 244 Init *ParseIDValue(Record *CurRec, StringInit *Name, SMLoc NameLoc, 245 IDParseMode Mode = ParseValueMode); 246 Init *ParseSimpleValue(Record *CurRec, RecTy *ItemType = nullptr, 247 IDParseMode Mode = ParseValueMode); 248 Init *ParseValue(Record *CurRec, RecTy *ItemType = nullptr, 249 IDParseMode Mode = ParseValueMode); 250 void ParseValueList(SmallVectorImpl<llvm::Init*> &Result, 251 Record *CurRec, RecTy *ItemType = nullptr); 252 bool ParseTemplateArgValueList(SmallVectorImpl<llvm::Init *> &Result, 253 Record *CurRec, Record *ArgsRec); 254 void ParseDagArgList( 255 SmallVectorImpl<std::pair<llvm::Init*, StringInit*>> &Result, 256 Record *CurRec); 257 bool ParseOptionalRangeList(SmallVectorImpl<unsigned> &Ranges); 258 bool ParseOptionalBitList(SmallVectorImpl<unsigned> &Ranges); 259 void ParseRangeList(SmallVectorImpl<unsigned> &Result); 260 bool ParseRangePiece(SmallVectorImpl<unsigned> &Ranges, 261 TypedInit *FirstItem = nullptr); 262 RecTy *ParseType(); 263 Init *ParseOperation(Record *CurRec, RecTy *ItemType); 264 Init *ParseOperationSubstr(Record *CurRec, RecTy *ItemType); 265 Init *ParseOperationFind(Record *CurRec, RecTy *ItemType); 266 Init *ParseOperationForEachFilter(Record *CurRec, RecTy *ItemType); 267 Init *ParseOperationCond(Record *CurRec, RecTy *ItemType); 268 RecTy *ParseOperatorType(); 269 Init *ParseObjectName(MultiClass *CurMultiClass); 270 Record *ParseClassID(); 271 MultiClass *ParseMultiClassID(); 272 bool ApplyLetStack(Record *CurRec); 273 bool ApplyLetStack(RecordsEntry &Entry); 274 bool CheckTemplateArgValues(SmallVectorImpl<llvm::Init *> &Values, 275 SMLoc Loc, Record *ArgsRec); 276 }; 277 278 } // end namespace llvm 279 280 #endif 281