SemaTemplateInstantiateDecl.cpp revision f43d0b37c1d3f529d0f206e786ae6de61c5f364a
1//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/ 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// This file implements C++ template instantiation for declarations. 10// 11//===----------------------------------------------------------------------===/ 12#include "Sema.h" 13#include "clang/AST/ASTConsumer.h" 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclTemplate.h" 16#include "clang/AST/DeclVisitor.h" 17#include "clang/AST/Expr.h" 18#include "clang/Basic/PrettyStackTrace.h" 19#include "clang/Lex/Preprocessor.h" 20#include "llvm/Support/Compiler.h" 21 22using namespace clang; 23 24namespace { 25 class VISIBILITY_HIDDEN TemplateDeclInstantiator 26 : public DeclVisitor<TemplateDeclInstantiator, Decl *> { 27 Sema &SemaRef; 28 DeclContext *Owner; 29 const MultiLevelTemplateArgumentList &TemplateArgs; 30 31 public: 32 typedef Sema::OwningExprResult OwningExprResult; 33 34 TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner, 35 const MultiLevelTemplateArgumentList &TemplateArgs) 36 : SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { } 37 38 // FIXME: Once we get closer to completion, replace these manually-written 39 // declarations with automatically-generated ones from 40 // clang/AST/DeclNodes.def. 41 Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D); 42 Decl *VisitNamespaceDecl(NamespaceDecl *D); 43 Decl *VisitTypedefDecl(TypedefDecl *D); 44 Decl *VisitVarDecl(VarDecl *D); 45 Decl *VisitFieldDecl(FieldDecl *D); 46 Decl *VisitStaticAssertDecl(StaticAssertDecl *D); 47 Decl *VisitEnumDecl(EnumDecl *D); 48 Decl *VisitEnumConstantDecl(EnumConstantDecl *D); 49 Decl *VisitFriendDecl(FriendDecl *D); 50 Decl *VisitFunctionDecl(FunctionDecl *D); 51 Decl *VisitCXXRecordDecl(CXXRecordDecl *D); 52 Decl *VisitCXXMethodDecl(CXXMethodDecl *D, 53 TemplateParameterList *TemplateParams = 0); 54 Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D); 55 Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D); 56 Decl *VisitCXXConversionDecl(CXXConversionDecl *D); 57 ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D); 58 Decl *VisitOriginalParmVarDecl(OriginalParmVarDecl *D); 59 Decl *VisitClassTemplateDecl(ClassTemplateDecl *D); 60 Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D); 61 Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D); 62 Decl *VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D); 63 64 // Base case. FIXME: Remove once we can instantiate everything. 65 Decl *VisitDecl(Decl *) { 66 assert(false && "Template instantiation of unknown declaration kind!"); 67 return 0; 68 } 69 70 const LangOptions &getLangOptions() { 71 return SemaRef.getLangOptions(); 72 } 73 74 // Helper functions for instantiating methods. 75 QualType SubstFunctionType(FunctionDecl *D, 76 llvm::SmallVectorImpl<ParmVarDecl *> &Params); 77 bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl); 78 bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl); 79 80 TemplateParameterList * 81 SubstTemplateParams(TemplateParameterList *List); 82 }; 83} 84 85Decl * 86TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { 87 assert(false && "Translation units cannot be instantiated"); 88 return D; 89} 90 91Decl * 92TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { 93 assert(false && "Namespaces cannot be instantiated"); 94 return D; 95} 96 97Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { 98 bool Invalid = false; 99 QualType T = D->getUnderlyingType(); 100 if (T->isDependentType()) { 101 T = SemaRef.SubstType(T, TemplateArgs, 102 D->getLocation(), D->getDeclName()); 103 if (T.isNull()) { 104 Invalid = true; 105 T = SemaRef.Context.IntTy; 106 } 107 } 108 109 // Create the new typedef 110 TypedefDecl *Typedef 111 = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(), 112 D->getIdentifier(), T); 113 if (Invalid) 114 Typedef->setInvalidDecl(); 115 116 Owner->addDecl(Typedef); 117 118 return Typedef; 119} 120 121Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { 122 // Do substitution on the type of the declaration 123 QualType T = SemaRef.SubstType(D->getType(), TemplateArgs, 124 D->getTypeSpecStartLoc(), 125 D->getDeclName()); 126 if (T.isNull()) 127 return 0; 128 129 // Build the instantiated declaration 130 VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, 131 D->getLocation(), D->getIdentifier(), 132 T, D->getDeclaratorInfo(), 133 D->getStorageClass()); 134 Var->setThreadSpecified(D->isThreadSpecified()); 135 Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); 136 Var->setDeclaredInCondition(D->isDeclaredInCondition()); 137 138 // If we are instantiating a static data member defined 139 // out-of-line, the instantiation will have the same lexical 140 // context (which will be a namespace scope) as the template. 141 if (D->isOutOfLine()) 142 Var->setLexicalDeclContext(D->getLexicalDeclContext()); 143 144 // FIXME: In theory, we could have a previous declaration for variables that 145 // are not static data members. 146 bool Redeclaration = false; 147 SemaRef.CheckVariableDeclaration(Var, 0, Redeclaration); 148 149 if (D->isOutOfLine()) { 150 D->getLexicalDeclContext()->addDecl(Var); 151 Owner->makeDeclVisibleInContext(Var); 152 } else { 153 Owner->addDecl(Var); 154 } 155 156 if (D->getInit()) { 157 OwningExprResult Init 158 = SemaRef.SubstExpr(D->getInit(), TemplateArgs); 159 if (Init.isInvalid()) 160 Var->setInvalidDecl(); 161 else if (ParenListExpr *PLE = dyn_cast<ParenListExpr>((Expr *)Init.get())) { 162 // FIXME: We're faking all of the comma locations, which is suboptimal. 163 // Do we even need these comma locations? 164 llvm::SmallVector<SourceLocation, 4> FakeCommaLocs; 165 if (PLE->getNumExprs() > 0) { 166 FakeCommaLocs.reserve(PLE->getNumExprs() - 1); 167 for (unsigned I = 0, N = PLE->getNumExprs() - 1; I != N; ++I) { 168 Expr *E = PLE->getExpr(I)->Retain(); 169 FakeCommaLocs.push_back( 170 SemaRef.PP.getLocForEndOfToken(E->getLocEnd())); 171 } 172 PLE->getExpr(PLE->getNumExprs() - 1)->Retain(); 173 } 174 175 // Add the direct initializer to the declaration. 176 SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var), 177 PLE->getLParenLoc(), 178 Sema::MultiExprArg(SemaRef, 179 (void**)PLE->getExprs(), 180 PLE->getNumExprs()), 181 FakeCommaLocs.data(), 182 PLE->getRParenLoc()); 183 184 // When Init is destroyed, it will destroy the instantiated ParenListExpr; 185 // we've explicitly retained all of its subexpressions already. 186 } else 187 SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init), 188 D->hasCXXDirectInitializer()); 189 } else if (!Var->isStaticDataMember() || Var->isOutOfLine()) 190 SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false); 191 192 // Link instantiations of static data members back to the template from 193 // which they were instantiated. 194 if (Var->isStaticDataMember()) 195 SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D); 196 197 return Var; 198} 199 200Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { 201 bool Invalid = false; 202 QualType T = D->getType(); 203 if (T->isDependentType()) { 204 T = SemaRef.SubstType(T, TemplateArgs, 205 D->getLocation(), D->getDeclName()); 206 if (!T.isNull() && T->isFunctionType()) { 207 // C++ [temp.arg.type]p3: 208 // If a declaration acquires a function type through a type 209 // dependent on a template-parameter and this causes a 210 // declaration that does not use the syntactic form of a 211 // function declarator to have function type, the program is 212 // ill-formed. 213 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) 214 << T; 215 T = QualType(); 216 Invalid = true; 217 } 218 } 219 220 Expr *BitWidth = D->getBitWidth(); 221 if (Invalid) 222 BitWidth = 0; 223 else if (BitWidth) { 224 // The bit-width expression is not potentially evaluated. 225 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 226 227 OwningExprResult InstantiatedBitWidth 228 = SemaRef.SubstExpr(BitWidth, TemplateArgs); 229 if (InstantiatedBitWidth.isInvalid()) { 230 Invalid = true; 231 BitWidth = 0; 232 } else 233 BitWidth = InstantiatedBitWidth.takeAs<Expr>(); 234 } 235 236 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), T, 237 D->getDeclaratorInfo(), 238 cast<RecordDecl>(Owner), 239 D->getLocation(), 240 D->isMutable(), 241 BitWidth, 242 D->getTypeSpecStartLoc(), 243 D->getAccess(), 244 0); 245 if (!Field) 246 return 0; 247 248 if (Invalid) 249 Field->setInvalidDecl(); 250 251 if (!Field->getDeclName()) { 252 // Keep track of where this decl came from. 253 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); 254 } 255 256 Field->setImplicit(D->isImplicit()); 257 Owner->addDecl(Field); 258 259 return Field; 260} 261 262Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { 263 FriendDecl::FriendUnion FU; 264 265 // Handle friend type expressions by simply substituting template 266 // parameters into the pattern type. 267 if (Type *Ty = D->getFriendType()) { 268 QualType T = SemaRef.SubstType(QualType(Ty,0), TemplateArgs, 269 D->getLocation(), DeclarationName()); 270 if (T.isNull()) return 0; 271 272 assert(getLangOptions().CPlusPlus0x || T->isRecordType()); 273 FU = T.getTypePtr(); 274 275 // Handle everything else by appropriate substitution. 276 } else { 277 NamedDecl *ND = D->getFriendDecl(); 278 assert(ND && "friend decl must be a decl or a type!"); 279 280 Decl *NewND = Visit(ND); 281 if (!NewND) return 0; 282 283 FU = cast<NamedDecl>(NewND); 284 } 285 286 FriendDecl *FD = 287 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), FU, 288 D->getFriendLoc()); 289 FD->setAccess(AS_public); 290 Owner->addDecl(FD); 291 return FD; 292} 293 294Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { 295 Expr *AssertExpr = D->getAssertExpr(); 296 297 // The expression in a static assertion is not potentially evaluated. 298 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 299 300 OwningExprResult InstantiatedAssertExpr 301 = SemaRef.SubstExpr(AssertExpr, TemplateArgs); 302 if (InstantiatedAssertExpr.isInvalid()) 303 return 0; 304 305 OwningExprResult Message(SemaRef, D->getMessage()); 306 D->getMessage()->Retain(); 307 Decl *StaticAssert 308 = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), 309 move(InstantiatedAssertExpr), 310 move(Message)).getAs<Decl>(); 311 return StaticAssert; 312} 313 314Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { 315 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, 316 D->getLocation(), D->getIdentifier(), 317 D->getTagKeywordLoc(), 318 /*PrevDecl=*/0); 319 Enum->setInstantiationOfMemberEnum(D); 320 Enum->setAccess(D->getAccess()); 321 Owner->addDecl(Enum); 322 Enum->startDefinition(); 323 324 llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators; 325 326 EnumConstantDecl *LastEnumConst = 0; 327 for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), 328 ECEnd = D->enumerator_end(); 329 EC != ECEnd; ++EC) { 330 // The specified value for the enumerator. 331 OwningExprResult Value = SemaRef.Owned((Expr *)0); 332 if (Expr *UninstValue = EC->getInitExpr()) { 333 // The enumerator's value expression is not potentially evaluated. 334 EnterExpressionEvaluationContext Unevaluated(SemaRef, 335 Action::Unevaluated); 336 337 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); 338 } 339 340 // Drop the initial value and continue. 341 bool isInvalid = false; 342 if (Value.isInvalid()) { 343 Value = SemaRef.Owned((Expr *)0); 344 isInvalid = true; 345 } 346 347 EnumConstantDecl *EnumConst 348 = SemaRef.CheckEnumConstant(Enum, LastEnumConst, 349 EC->getLocation(), EC->getIdentifier(), 350 move(Value)); 351 352 if (isInvalid) { 353 if (EnumConst) 354 EnumConst->setInvalidDecl(); 355 Enum->setInvalidDecl(); 356 } 357 358 if (EnumConst) { 359 Enum->addDecl(EnumConst); 360 Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst)); 361 LastEnumConst = EnumConst; 362 } 363 } 364 365 // FIXME: Fixup LBraceLoc and RBraceLoc 366 // FIXME: Empty Scope and AttributeList (required to handle attribute packed). 367 SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), 368 Sema::DeclPtrTy::make(Enum), 369 &Enumerators[0], Enumerators.size(), 370 0, 0); 371 372 return Enum; 373} 374 375Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { 376 assert(false && "EnumConstantDecls can only occur within EnumDecls."); 377 return 0; 378} 379 380Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { 381 TemplateParameterList *TempParams = D->getTemplateParameters(); 382 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 383 if (!InstParams) 384 return NULL; 385 386 CXXRecordDecl *Pattern = D->getTemplatedDecl(); 387 CXXRecordDecl *RecordInst 388 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner, 389 Pattern->getLocation(), Pattern->getIdentifier(), 390 Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL); 391 392 ClassTemplateDecl *Inst 393 = ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), 394 D->getIdentifier(), InstParams, RecordInst, 0); 395 RecordInst->setDescribedClassTemplate(Inst); 396 Inst->setAccess(D->getAccess()); 397 Inst->setInstantiatedFromMemberTemplate(D); 398 399 Owner->addDecl(Inst); 400 return Inst; 401} 402 403Decl * 404TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { 405 // FIXME: Dig out the out-of-line definition of this function template? 406 407 TemplateParameterList *TempParams = D->getTemplateParameters(); 408 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 409 if (!InstParams) 410 return NULL; 411 412 // FIXME: Handle instantiation of nested function templates that aren't 413 // member function templates. This could happen inside a FriendDecl. 414 assert(isa<CXXMethodDecl>(D->getTemplatedDecl())); 415 CXXMethodDecl *InstMethod 416 = cast_or_null<CXXMethodDecl>( 417 VisitCXXMethodDecl(cast<CXXMethodDecl>(D->getTemplatedDecl()), 418 InstParams)); 419 if (!InstMethod) 420 return 0; 421 422 // Link the instantiated function template declaration to the function 423 // template from which it was instantiated. 424 FunctionTemplateDecl *InstTemplate = InstMethod->getDescribedFunctionTemplate(); 425 assert(InstTemplate && "VisitCXXMethodDecl didn't create a template!"); 426 InstTemplate->setInstantiatedFromMemberTemplate(D); 427 Owner->addDecl(InstTemplate); 428 return InstTemplate; 429} 430 431Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { 432 CXXRecordDecl *PrevDecl = 0; 433 if (D->isInjectedClassName()) 434 PrevDecl = cast<CXXRecordDecl>(Owner); 435 436 CXXRecordDecl *Record 437 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, 438 D->getLocation(), D->getIdentifier(), 439 D->getTagKeywordLoc(), PrevDecl); 440 Record->setImplicit(D->isImplicit()); 441 // FIXME: Check against AS_none is an ugly hack to work around the issue that 442 // the tag decls introduced by friend class declarations don't have an access 443 // specifier. Remove once this area of the code gets sorted out. 444 if (D->getAccess() != AS_none) 445 Record->setAccess(D->getAccess()); 446 if (!D->isInjectedClassName()) 447 Record->setInstantiationOfMemberClass(D); 448 449 // If the original function was part of a friend declaration, 450 // inherit its namespace state. 451 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) 452 Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); 453 454 Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion()); 455 456 Owner->addDecl(Record); 457 return Record; 458} 459 460/// Normal class members are of more specific types and therefore 461/// don't make it here. This function serves two purposes: 462/// 1) instantiating function templates 463/// 2) substituting friend declarations 464/// FIXME: preserve function definitions in case #2 465Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D) { 466 // Check whether there is already a function template specialization for 467 // this declaration. 468 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 469 void *InsertPos = 0; 470 if (FunctionTemplate) { 471 llvm::FoldingSetNodeID ID; 472 FunctionTemplateSpecializationInfo::Profile(ID, 473 TemplateArgs.getInnermost().getFlatArgumentList(), 474 TemplateArgs.getInnermost().flat_size(), 475 SemaRef.Context); 476 477 FunctionTemplateSpecializationInfo *Info 478 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 479 InsertPos); 480 481 // If we already have a function template specialization, return it. 482 if (Info) 483 return Info->Function; 484 } 485 486 Sema::LocalInstantiationScope Scope(SemaRef); 487 488 llvm::SmallVector<ParmVarDecl *, 4> Params; 489 QualType T = SubstFunctionType(D, Params); 490 if (T.isNull()) 491 return 0; 492 493 // Build the instantiated method declaration. 494 DeclContext *DC = SemaRef.FindInstantiatedContext(D->getDeclContext(), 495 TemplateArgs); 496 FunctionDecl *Function = 497 FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(), 498 D->getDeclName(), T, D->getDeclaratorInfo(), 499 D->getStorageClass(), 500 D->isInline(), D->hasWrittenPrototype()); 501 Function->setLexicalDeclContext(Owner); 502 503 // Attach the parameters 504 for (unsigned P = 0; P < Params.size(); ++P) 505 Params[P]->setOwningFunction(Function); 506 Function->setParams(SemaRef.Context, Params.data(), Params.size()); 507 508 // If the original function was part of a friend declaration, 509 // inherit its namespace state and add it to the owner. 510 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) { 511 bool WasDeclared = (FOK == Decl::FOK_Declared); 512 Function->setObjectOfFriendDecl(WasDeclared); 513 if (!Owner->isDependentContext()) 514 DC->makeDeclVisibleInContext(Function, /* Recoverable = */ false); 515 516 Function->setInstantiationOfMemberFunction(D); 517 } 518 519 if (InitFunctionInstantiation(Function, D)) 520 Function->setInvalidDecl(); 521 522 bool Redeclaration = false; 523 bool OverloadableAttrRequired = false; 524 NamedDecl *PrevDecl = 0; 525 SemaRef.CheckFunctionDeclaration(Function, PrevDecl, Redeclaration, 526 /*FIXME:*/OverloadableAttrRequired); 527 528 if (FunctionTemplate) { 529 // Record this function template specialization. 530 Function->setFunctionTemplateSpecialization(SemaRef.Context, 531 FunctionTemplate, 532 &TemplateArgs.getInnermost(), 533 InsertPos); 534 } 535 536 return Function; 537} 538 539Decl * 540TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, 541 TemplateParameterList *TemplateParams) { 542 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 543 void *InsertPos = 0; 544 if (FunctionTemplate && !TemplateParams) { 545 // We are creating a function template specialization from a function 546 // template. Check whether there is already a function template 547 // specialization for this particular set of template arguments. 548 llvm::FoldingSetNodeID ID; 549 FunctionTemplateSpecializationInfo::Profile(ID, 550 TemplateArgs.getInnermost().getFlatArgumentList(), 551 TemplateArgs.getInnermost().flat_size(), 552 SemaRef.Context); 553 554 FunctionTemplateSpecializationInfo *Info 555 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 556 InsertPos); 557 558 // If we already have a function template specialization, return it. 559 if (Info) 560 return Info->Function; 561 } 562 563 Sema::LocalInstantiationScope Scope(SemaRef); 564 565 llvm::SmallVector<ParmVarDecl *, 4> Params; 566 QualType T = SubstFunctionType(D, Params); 567 if (T.isNull()) 568 return 0; 569 570 // Build the instantiated method declaration. 571 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 572 CXXMethodDecl *Method = 0; 573 574 DeclarationName Name = D->getDeclName(); 575 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 576 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 577 Name = SemaRef.Context.DeclarationNames.getCXXConstructorName( 578 SemaRef.Context.getCanonicalType(ClassTy)); 579 Method = CXXConstructorDecl::Create(SemaRef.Context, Record, 580 Constructor->getLocation(), 581 Name, T, 582 Constructor->getDeclaratorInfo(), 583 Constructor->isExplicit(), 584 Constructor->isInline(), false); 585 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 586 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 587 Name = SemaRef.Context.DeclarationNames.getCXXDestructorName( 588 SemaRef.Context.getCanonicalType(ClassTy)); 589 Method = CXXDestructorDecl::Create(SemaRef.Context, Record, 590 Destructor->getLocation(), Name, 591 T, Destructor->isInline(), false); 592 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) { 593 CanQualType ConvTy 594 = SemaRef.Context.getCanonicalType( 595 T->getAs<FunctionType>()->getResultType()); 596 Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName( 597 ConvTy); 598 Method = CXXConversionDecl::Create(SemaRef.Context, Record, 599 Conversion->getLocation(), Name, 600 T, Conversion->getDeclaratorInfo(), 601 Conversion->isInline(), 602 Conversion->isExplicit()); 603 } else { 604 Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(), 605 D->getDeclName(), T, D->getDeclaratorInfo(), 606 D->isStatic(), D->isInline()); 607 } 608 609 if (TemplateParams) { 610 // Our resulting instantiation is actually a function template, since we 611 // are substituting only the outer template parameters. For example, given 612 // 613 // template<typename T> 614 // struct X { 615 // template<typename U> void f(T, U); 616 // }; 617 // 618 // X<int> x; 619 // 620 // We are instantiating the member template "f" within X<int>, which means 621 // substituting int for T, but leaving "f" as a member function template. 622 // Build the function template itself. 623 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, 624 Method->getLocation(), 625 Method->getDeclName(), 626 TemplateParams, Method); 627 if (D->isOutOfLine()) 628 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 629 Method->setDescribedFunctionTemplate(FunctionTemplate); 630 } else if (!FunctionTemplate) 631 Method->setInstantiationOfMemberFunction(D); 632 633 // If we are instantiating a member function defined 634 // out-of-line, the instantiation will have the same lexical 635 // context (which will be a namespace scope) as the template. 636 if (D->isOutOfLine()) 637 Method->setLexicalDeclContext(D->getLexicalDeclContext()); 638 639 // Attach the parameters 640 for (unsigned P = 0; P < Params.size(); ++P) 641 Params[P]->setOwningFunction(Method); 642 Method->setParams(SemaRef.Context, Params.data(), Params.size()); 643 644 if (InitMethodInstantiation(Method, D)) 645 Method->setInvalidDecl(); 646 647 NamedDecl *PrevDecl = 0; 648 649 if (!FunctionTemplate || TemplateParams) { 650 PrevDecl = SemaRef.LookupQualifiedName(Owner, Name, 651 Sema::LookupOrdinaryName, true); 652 653 // In C++, the previous declaration we find might be a tag type 654 // (class or enum). In this case, the new declaration will hide the 655 // tag type. Note that this does does not apply if we're declaring a 656 // typedef (C++ [dcl.typedef]p4). 657 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 658 PrevDecl = 0; 659 } 660 661 if (FunctionTemplate && !TemplateParams) 662 // Record this function template specialization. 663 Method->setFunctionTemplateSpecialization(SemaRef.Context, 664 FunctionTemplate, 665 &TemplateArgs.getInnermost(), 666 InsertPos); 667 668 bool Redeclaration = false; 669 bool OverloadableAttrRequired = false; 670 SemaRef.CheckFunctionDeclaration(Method, PrevDecl, Redeclaration, 671 /*FIXME:*/OverloadableAttrRequired); 672 673 if (!FunctionTemplate && (!Method->isInvalidDecl() || !PrevDecl)) 674 Owner->addDecl(Method); 675 676 return Method; 677} 678 679Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { 680 return VisitCXXMethodDecl(D); 681} 682 683Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { 684 return VisitCXXMethodDecl(D); 685} 686 687Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { 688 return VisitCXXMethodDecl(D); 689} 690 691ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { 692 QualType OrigT = SemaRef.SubstType(D->getOriginalType(), TemplateArgs, 693 D->getLocation(), D->getDeclName()); 694 if (OrigT.isNull()) 695 return 0; 696 697 QualType T = SemaRef.adjustParameterType(OrigT); 698 699 // Allocate the parameter 700 ParmVarDecl *Param = 0; 701 if (T == OrigT) 702 Param = ParmVarDecl::Create(SemaRef.Context, Owner, D->getLocation(), 703 D->getIdentifier(), T, D->getDeclaratorInfo(), 704 D->getStorageClass(), 0); 705 else 706 Param = OriginalParmVarDecl::Create(SemaRef.Context, Owner, 707 D->getLocation(), D->getIdentifier(), 708 T, D->getDeclaratorInfo(), OrigT, 709 D->getStorageClass(), 0); 710 711 // Mark the default argument as being uninstantiated. 712 if (D->hasUninstantiatedDefaultArg()) 713 Param->setUninstantiatedDefaultArg(D->getUninstantiatedDefaultArg()); 714 715 // Note: we don't try to instantiate function parameters until after 716 // we've instantiated the function's type. Therefore, we don't have 717 // to check for 'void' parameter types here. 718 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 719 return Param; 720} 721 722Decl * 723TemplateDeclInstantiator::VisitOriginalParmVarDecl(OriginalParmVarDecl *D) { 724 // Since parameter types can decay either before or after 725 // instantiation, we simply treat OriginalParmVarDecls as 726 // ParmVarDecls the same way, and create one or the other depending 727 // on what happens after template instantiation. 728 return VisitParmVarDecl(D); 729} 730 731Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( 732 TemplateTypeParmDecl *D) { 733 // TODO: don't always clone when decls are refcounted. 734 const Type* T = D->getTypeForDecl(); 735 assert(T->isTemplateTypeParmType()); 736 const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>(); 737 738 TemplateTypeParmDecl *Inst = 739 TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 740 TTPT->getDepth(), TTPT->getIndex(), 741 TTPT->getName(), 742 D->wasDeclaredWithTypename(), 743 D->isParameterPack()); 744 745 if (D->hasDefaultArgument()) { 746 QualType DefaultPattern = D->getDefaultArgument(); 747 QualType DefaultInst 748 = SemaRef.SubstType(DefaultPattern, TemplateArgs, 749 D->getDefaultArgumentLoc(), 750 D->getDeclName()); 751 752 Inst->setDefaultArgument(DefaultInst, 753 D->getDefaultArgumentLoc(), 754 D->defaultArgumentWasInherited() /* preserve? */); 755 } 756 757 return Inst; 758} 759 760Decl * 761TemplateDeclInstantiator::VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D) { 762 NestedNameSpecifier *NNS = 763 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 764 D->getTargetNestedNameRange(), 765 TemplateArgs); 766 if (!NNS) 767 return 0; 768 769 CXXScopeSpec SS; 770 SS.setRange(D->getTargetNestedNameRange()); 771 SS.setScopeRep(NNS); 772 773 NamedDecl *UD = 774 SemaRef.BuildUsingDeclaration(D->getLocation(), SS, 775 D->getTargetNameLocation(), 776 D->getTargetName(), 0, D->isTypeName()); 777 if (UD) 778 SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD), 779 D); 780 return UD; 781} 782 783Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, 784 const MultiLevelTemplateArgumentList &TemplateArgs) { 785 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); 786 return Instantiator.Visit(D); 787} 788 789/// \brief Instantiates a nested template parameter list in the current 790/// instantiation context. 791/// 792/// \param L The parameter list to instantiate 793/// 794/// \returns NULL if there was an error 795TemplateParameterList * 796TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { 797 // Get errors for all the parameters before bailing out. 798 bool Invalid = false; 799 800 unsigned N = L->size(); 801 typedef llvm::SmallVector<NamedDecl *, 8> ParamVector; 802 ParamVector Params; 803 Params.reserve(N); 804 for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); 805 PI != PE; ++PI) { 806 NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); 807 Params.push_back(D); 808 Invalid = Invalid || !D; 809 } 810 811 // Clean up if we had an error. 812 if (Invalid) { 813 for (ParamVector::iterator PI = Params.begin(), PE = Params.end(); 814 PI != PE; ++PI) 815 if (*PI) 816 (*PI)->Destroy(SemaRef.Context); 817 return NULL; 818 } 819 820 TemplateParameterList *InstL 821 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), 822 L->getLAngleLoc(), &Params.front(), N, 823 L->getRAngleLoc()); 824 return InstL; 825} 826 827/// \brief Does substitution on the type of the given function, including 828/// all of the function parameters. 829/// 830/// \param D The function whose type will be the basis of the substitution 831/// 832/// \param Params the instantiated parameter declarations 833 834/// \returns the instantiated function's type if successful, a NULL 835/// type if there was an error. 836QualType 837TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, 838 llvm::SmallVectorImpl<ParmVarDecl *> &Params) { 839 bool InvalidDecl = false; 840 841 // Substitute all of the function's formal parameter types. 842 TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs); 843 llvm::SmallVector<QualType, 4> ParamTys; 844 for (FunctionDecl::param_iterator P = D->param_begin(), 845 PEnd = D->param_end(); 846 P != PEnd; ++P) { 847 if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) { 848 if (PInst->getType()->isVoidType()) { 849 SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type); 850 PInst->setInvalidDecl(); 851 } else if (SemaRef.RequireNonAbstractType(PInst->getLocation(), 852 PInst->getType(), 853 diag::err_abstract_type_in_decl, 854 Sema::AbstractParamType)) 855 PInst->setInvalidDecl(); 856 857 Params.push_back(PInst); 858 ParamTys.push_back(PInst->getType()); 859 860 if (PInst->isInvalidDecl()) 861 InvalidDecl = true; 862 } else 863 InvalidDecl = true; 864 } 865 866 // FIXME: Deallocate dead declarations. 867 if (InvalidDecl) 868 return QualType(); 869 870 const FunctionProtoType *Proto = D->getType()->getAs<FunctionProtoType>(); 871 assert(Proto && "Missing prototype?"); 872 QualType ResultType 873 = SemaRef.SubstType(Proto->getResultType(), TemplateArgs, 874 D->getLocation(), D->getDeclName()); 875 if (ResultType.isNull()) 876 return QualType(); 877 878 return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(), 879 Proto->isVariadic(), Proto->getTypeQuals(), 880 D->getLocation(), D->getDeclName()); 881} 882 883/// \brief Initializes the common fields of an instantiation function 884/// declaration (New) from the corresponding fields of its template (Tmpl). 885/// 886/// \returns true if there was an error 887bool 888TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, 889 FunctionDecl *Tmpl) { 890 if (Tmpl->isDeleted()) 891 New->setDeleted(); 892 893 // If we are performing substituting explicitly-specified template arguments 894 // or deduced template arguments into a function template and we reach this 895 // point, we are now past the point where SFINAE applies and have committed 896 // to keeping the new function template specialization. We therefore 897 // convert the active template instantiation for the function template 898 // into a template instantiation for this specific function template 899 // specialization, which is not a SFINAE context, so that we diagnose any 900 // further errors in the declaration itself. 901 typedef Sema::ActiveTemplateInstantiation ActiveInstType; 902 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); 903 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || 904 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { 905 if (FunctionTemplateDecl *FunTmpl 906 = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { 907 assert(FunTmpl->getTemplatedDecl() == Tmpl && 908 "Deduction from the wrong function template?"); 909 (void) FunTmpl; 910 ActiveInst.Kind = ActiveInstType::TemplateInstantiation; 911 ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); 912 } 913 } 914 915 return false; 916} 917 918/// \brief Initializes common fields of an instantiated method 919/// declaration (New) from the corresponding fields of its template 920/// (Tmpl). 921/// 922/// \returns true if there was an error 923bool 924TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, 925 CXXMethodDecl *Tmpl) { 926 if (InitFunctionInstantiation(New, Tmpl)) 927 return true; 928 929 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 930 New->setAccess(Tmpl->getAccess()); 931 if (Tmpl->isVirtualAsWritten()) { 932 New->setVirtualAsWritten(true); 933 Record->setAggregate(false); 934 Record->setPOD(false); 935 Record->setEmpty(false); 936 Record->setPolymorphic(true); 937 } 938 if (Tmpl->isPure()) { 939 New->setPure(); 940 Record->setAbstract(true); 941 } 942 943 // FIXME: attributes 944 // FIXME: New needs a pointer to Tmpl 945 return false; 946} 947 948/// \brief Instantiate the definition of the given function from its 949/// template. 950/// 951/// \param PointOfInstantiation the point at which the instantiation was 952/// required. Note that this is not precisely a "point of instantiation" 953/// for the function, but it's close. 954/// 955/// \param Function the already-instantiated declaration of a 956/// function template specialization or member function of a class template 957/// specialization. 958/// 959/// \param Recursive if true, recursively instantiates any functions that 960/// are required by this instantiation. 961void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, 962 FunctionDecl *Function, 963 bool Recursive) { 964 if (Function->isInvalidDecl()) 965 return; 966 967 assert(!Function->getBody() && "Already instantiated!"); 968 969 // Find the function body that we'll be substituting. 970 const FunctionDecl *PatternDecl = 0; 971 if (FunctionTemplateDecl *Primary = Function->getPrimaryTemplate()) { 972 while (Primary->getInstantiatedFromMemberTemplate()) 973 Primary = Primary->getInstantiatedFromMemberTemplate(); 974 975 PatternDecl = Primary->getTemplatedDecl(); 976 } else 977 PatternDecl = Function->getInstantiatedFromMemberFunction(); 978 Stmt *Pattern = 0; 979 if (PatternDecl) 980 Pattern = PatternDecl->getBody(PatternDecl); 981 982 if (!Pattern) 983 return; 984 985 // C++0x [temp.explicit]p9: 986 // Except for inline functions, other explicit instantiation declarations 987 // have the effect of suppressing the implicit instantiation of the entity 988 // to which they refer. 989 if (Function->getTemplateSpecializationKind() 990 == TSK_ExplicitInstantiationDeclaration && 991 PatternDecl->isOutOfLine() && !PatternDecl->isInline()) 992 return; 993 994 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); 995 if (Inst) 996 return; 997 998 // If we're performing recursive template instantiation, create our own 999 // queue of pending implicit instantiations that we will instantiate later, 1000 // while we're still within our own instantiation context. 1001 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1002 if (Recursive) 1003 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1004 1005 ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function)); 1006 1007 // Introduce a new scope where local variable instantiations will be 1008 // recorded. 1009 LocalInstantiationScope Scope(*this); 1010 1011 // Introduce the instantiated function parameters into the local 1012 // instantiation scope. 1013 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) 1014 Scope.InstantiatedLocal(PatternDecl->getParamDecl(I), 1015 Function->getParamDecl(I)); 1016 1017 // Enter the scope of this instantiation. We don't use 1018 // PushDeclContext because we don't have a scope. 1019 DeclContext *PreviousContext = CurContext; 1020 CurContext = Function; 1021 1022 MultiLevelTemplateArgumentList TemplateArgs = 1023 getTemplateInstantiationArgs(Function); 1024 1025 // If this is a constructor, instantiate the member initializers. 1026 if (const CXXConstructorDecl *Ctor = 1027 dyn_cast<CXXConstructorDecl>(PatternDecl)) { 1028 InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor, 1029 TemplateArgs); 1030 } 1031 1032 // Instantiate the function body. 1033 OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs); 1034 1035 if (Body.isInvalid()) 1036 Function->setInvalidDecl(); 1037 1038 ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body), 1039 /*IsInstantiation=*/true); 1040 1041 CurContext = PreviousContext; 1042 1043 DeclGroupRef DG(Function); 1044 Consumer.HandleTopLevelDecl(DG); 1045 1046 if (Recursive) { 1047 // Instantiate any pending implicit instantiations found during the 1048 // instantiation of this template. 1049 PerformPendingImplicitInstantiations(); 1050 1051 // Restore the set of pending implicit instantiations. 1052 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1053 } 1054} 1055 1056/// \brief Instantiate the definition of the given variable from its 1057/// template. 1058/// 1059/// \param PointOfInstantiation the point at which the instantiation was 1060/// required. Note that this is not precisely a "point of instantiation" 1061/// for the function, but it's close. 1062/// 1063/// \param Var the already-instantiated declaration of a static member 1064/// variable of a class template specialization. 1065/// 1066/// \param Recursive if true, recursively instantiates any functions that 1067/// are required by this instantiation. 1068void Sema::InstantiateStaticDataMemberDefinition( 1069 SourceLocation PointOfInstantiation, 1070 VarDecl *Var, 1071 bool Recursive) { 1072 if (Var->isInvalidDecl()) 1073 return; 1074 1075 // Find the out-of-line definition of this static data member. 1076 // FIXME: Do we have to look for specializations separately? 1077 VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); 1078 bool FoundOutOfLineDef = false; 1079 assert(Def && "This data member was not instantiated from a template?"); 1080 assert(Def->isStaticDataMember() && "Not a static data member?"); 1081 for (VarDecl::redecl_iterator RD = Def->redecls_begin(), 1082 RDEnd = Def->redecls_end(); 1083 RD != RDEnd; ++RD) { 1084 if (RD->getLexicalDeclContext()->isFileContext()) { 1085 Def = *RD; 1086 FoundOutOfLineDef = true; 1087 } 1088 } 1089 1090 if (!FoundOutOfLineDef) { 1091 // We did not find an out-of-line definition of this static data member, 1092 // so we won't perform any instantiation. Rather, we rely on the user to 1093 // instantiate this definition (or provide a specialization for it) in 1094 // another translation unit. 1095 return; 1096 } 1097 1098 // FIXME: extern templates 1099 1100 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); 1101 if (Inst) 1102 return; 1103 1104 // If we're performing recursive template instantiation, create our own 1105 // queue of pending implicit instantiations that we will instantiate later, 1106 // while we're still within our own instantiation context. 1107 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1108 if (Recursive) 1109 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1110 1111 // Enter the scope of this instantiation. We don't use 1112 // PushDeclContext because we don't have a scope. 1113 DeclContext *PreviousContext = CurContext; 1114 CurContext = Var->getDeclContext(); 1115 1116 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), 1117 getTemplateInstantiationArgs(Var))); 1118 1119 CurContext = PreviousContext; 1120 1121 if (Var) { 1122 DeclGroupRef DG(Var); 1123 Consumer.HandleTopLevelDecl(DG); 1124 } 1125 1126 if (Recursive) { 1127 // Instantiate any pending implicit instantiations found during the 1128 // instantiation of this template. 1129 PerformPendingImplicitInstantiations(); 1130 1131 // Restore the set of pending implicit instantiations. 1132 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1133 } 1134} 1135 1136void 1137Sema::InstantiateMemInitializers(CXXConstructorDecl *New, 1138 const CXXConstructorDecl *Tmpl, 1139 const MultiLevelTemplateArgumentList &TemplateArgs) { 1140 1141 llvm::SmallVector<MemInitTy*, 4> NewInits; 1142 1143 // Instantiate all the initializers. 1144 for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), 1145 InitsEnd = Tmpl->init_end(); 1146 Inits != InitsEnd; ++Inits) { 1147 CXXBaseOrMemberInitializer *Init = *Inits; 1148 1149 ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this); 1150 1151 // Instantiate all the arguments. 1152 for (ExprIterator Args = Init->arg_begin(), ArgsEnd = Init->arg_end(); 1153 Args != ArgsEnd; ++Args) { 1154 OwningExprResult NewArg = SubstExpr(*Args, TemplateArgs); 1155 1156 if (NewArg.isInvalid()) 1157 New->setInvalidDecl(); 1158 else 1159 NewArgs.push_back(NewArg.takeAs<Expr>()); 1160 } 1161 1162 MemInitResult NewInit; 1163 1164 if (Init->isBaseInitializer()) { 1165 QualType BaseType(Init->getBaseClass(), 0); 1166 BaseType = SubstType(BaseType, TemplateArgs, Init->getSourceLocation(), 1167 New->getDeclName()); 1168 1169 NewInit = BuildBaseInitializer(BaseType, 1170 (Expr **)NewArgs.data(), 1171 NewArgs.size(), 1172 Init->getSourceLocation(), 1173 Init->getRParenLoc(), 1174 New->getParent()); 1175 } else if (Init->isMemberInitializer()) { 1176 FieldDecl *Member; 1177 1178 // Is this an anonymous union? 1179 if (FieldDecl *UnionInit = Init->getAnonUnionMember()) 1180 Member = cast<FieldDecl>(FindInstantiatedDecl(UnionInit, TemplateArgs)); 1181 else 1182 Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMember(), 1183 TemplateArgs)); 1184 1185 NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(), 1186 NewArgs.size(), 1187 Init->getSourceLocation(), 1188 Init->getRParenLoc()); 1189 } 1190 1191 if (NewInit.isInvalid()) 1192 New->setInvalidDecl(); 1193 else { 1194 // FIXME: It would be nice if ASTOwningVector had a release function. 1195 NewArgs.take(); 1196 1197 NewInits.push_back((MemInitTy *)NewInit.get()); 1198 } 1199 } 1200 1201 // Assign all the initializers to the new constructor. 1202 ActOnMemInitializers(DeclPtrTy::make(New), 1203 /*FIXME: ColonLoc */ 1204 SourceLocation(), 1205 NewInits.data(), NewInits.size()); 1206} 1207 1208// TODO: this could be templated if the various decl types used the 1209// same method name. 1210static bool isInstantiationOf(ClassTemplateDecl *Pattern, 1211 ClassTemplateDecl *Instance) { 1212 Pattern = Pattern->getCanonicalDecl(); 1213 1214 do { 1215 Instance = Instance->getCanonicalDecl(); 1216 if (Pattern == Instance) return true; 1217 Instance = Instance->getInstantiatedFromMemberTemplate(); 1218 } while (Instance); 1219 1220 return false; 1221} 1222 1223static bool isInstantiationOf(CXXRecordDecl *Pattern, 1224 CXXRecordDecl *Instance) { 1225 Pattern = Pattern->getCanonicalDecl(); 1226 1227 do { 1228 Instance = Instance->getCanonicalDecl(); 1229 if (Pattern == Instance) return true; 1230 Instance = Instance->getInstantiatedFromMemberClass(); 1231 } while (Instance); 1232 1233 return false; 1234} 1235 1236static bool isInstantiationOf(FunctionDecl *Pattern, 1237 FunctionDecl *Instance) { 1238 Pattern = Pattern->getCanonicalDecl(); 1239 1240 do { 1241 Instance = Instance->getCanonicalDecl(); 1242 if (Pattern == Instance) return true; 1243 Instance = Instance->getInstantiatedFromMemberFunction(); 1244 } while (Instance); 1245 1246 return false; 1247} 1248 1249static bool isInstantiationOf(EnumDecl *Pattern, 1250 EnumDecl *Instance) { 1251 Pattern = Pattern->getCanonicalDecl(); 1252 1253 do { 1254 Instance = Instance->getCanonicalDecl(); 1255 if (Pattern == Instance) return true; 1256 Instance = Instance->getInstantiatedFromMemberEnum(); 1257 } while (Instance); 1258 1259 return false; 1260} 1261 1262static bool isInstantiationOf(UnresolvedUsingDecl *Pattern, 1263 UsingDecl *Instance, 1264 ASTContext &C) { 1265 return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern; 1266} 1267 1268static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, 1269 VarDecl *Instance) { 1270 assert(Instance->isStaticDataMember()); 1271 1272 Pattern = Pattern->getCanonicalDecl(); 1273 1274 do { 1275 Instance = Instance->getCanonicalDecl(); 1276 if (Pattern == Instance) return true; 1277 Instance = Instance->getInstantiatedFromStaticDataMember(); 1278 } while (Instance); 1279 1280 return false; 1281} 1282 1283static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { 1284 if (D->getKind() != Other->getKind()) { 1285 if (UnresolvedUsingDecl *UUD = dyn_cast<UnresolvedUsingDecl>(D)) { 1286 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 1287 return isInstantiationOf(UUD, UD, Ctx); 1288 } 1289 } 1290 1291 return false; 1292 } 1293 1294 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other)) 1295 return isInstantiationOf(cast<CXXRecordDecl>(D), Record); 1296 1297 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other)) 1298 return isInstantiationOf(cast<FunctionDecl>(D), Function); 1299 1300 if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other)) 1301 return isInstantiationOf(cast<EnumDecl>(D), Enum); 1302 1303 if (VarDecl *Var = dyn_cast<VarDecl>(Other)) 1304 if (Var->isStaticDataMember()) 1305 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var); 1306 1307 if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other)) 1308 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp); 1309 1310 if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) { 1311 if (!Field->getDeclName()) { 1312 // This is an unnamed field. 1313 return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == 1314 cast<FieldDecl>(D); 1315 } 1316 } 1317 1318 return D->getDeclName() && isa<NamedDecl>(Other) && 1319 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName(); 1320} 1321 1322template<typename ForwardIterator> 1323static NamedDecl *findInstantiationOf(ASTContext &Ctx, 1324 NamedDecl *D, 1325 ForwardIterator first, 1326 ForwardIterator last) { 1327 for (; first != last; ++first) 1328 if (isInstantiationOf(Ctx, D, *first)) 1329 return cast<NamedDecl>(*first); 1330 1331 return 0; 1332} 1333 1334/// \brief Finds the instantiation of the given declaration context 1335/// within the current instantiation. 1336/// 1337/// \returns NULL if there was an error 1338DeclContext *Sema::FindInstantiatedContext(DeclContext* DC, 1339 const MultiLevelTemplateArgumentList &TemplateArgs) { 1340 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) { 1341 Decl* ID = FindInstantiatedDecl(D, TemplateArgs); 1342 return cast_or_null<DeclContext>(ID); 1343 } else return DC; 1344} 1345 1346/// \brief Find the instantiation of the given declaration within the 1347/// current instantiation. 1348/// 1349/// This routine is intended to be used when \p D is a declaration 1350/// referenced from within a template, that needs to mapped into the 1351/// corresponding declaration within an instantiation. For example, 1352/// given: 1353/// 1354/// \code 1355/// template<typename T> 1356/// struct X { 1357/// enum Kind { 1358/// KnownValue = sizeof(T) 1359/// }; 1360/// 1361/// bool getKind() const { return KnownValue; } 1362/// }; 1363/// 1364/// template struct X<int>; 1365/// \endcode 1366/// 1367/// In the instantiation of X<int>::getKind(), we need to map the 1368/// EnumConstantDecl for KnownValue (which refers to 1369/// X<T>::<Kind>::KnownValue) to its instantiation 1370/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs 1371/// this mapping from within the instantiation of X<int>. 1372NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D, 1373 const MultiLevelTemplateArgumentList &TemplateArgs) { 1374 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) { 1375 // Transform all of the elements of the overloaded function set. 1376 OverloadedFunctionDecl *Result 1377 = OverloadedFunctionDecl::Create(Context, CurContext, Ovl->getDeclName()); 1378 1379 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 1380 FEnd = Ovl->function_end(); 1381 F != FEnd; ++F) { 1382 Result->addOverload( 1383 AnyFunctionDecl::getFromNamedDecl(FindInstantiatedDecl(*F, 1384 TemplateArgs))); 1385 } 1386 1387 return Result; 1388 } 1389 1390 DeclContext *ParentDC = D->getDeclContext(); 1391 if (isa<ParmVarDecl>(D) || ParentDC->isFunctionOrMethod()) { 1392 // D is a local of some kind. Look into the map of local 1393 // declarations to their instantiations. 1394 return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D)); 1395 } 1396 1397 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { 1398 if (!Record->isDependentContext()) 1399 return D; 1400 1401 // If the RecordDecl is actually the injected-class-name or a "templated" 1402 // declaration for a class template or class template partial 1403 // specialization, substitute into the injected-class-name of the 1404 // class template or partial specialization to find the new DeclContext. 1405 QualType T; 1406 ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate(); 1407 1408 if (ClassTemplate) { 1409 T = ClassTemplate->getInjectedClassNameType(Context); 1410 } else if (ClassTemplatePartialSpecializationDecl *PartialSpec 1411 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { 1412 T = Context.getTypeDeclType(Record); 1413 ClassTemplate = PartialSpec->getSpecializedTemplate(); 1414 } 1415 1416 if (!T.isNull()) { 1417 // Substitute into the injected-class-name to get the type corresponding 1418 // to the instantiation we want. This substitution should never fail, 1419 // since we know we can instantiate the injected-class-name or we wouldn't 1420 // have gotten to the injected-class-name! 1421 // FIXME: Can we use the CurrentInstantiationScope to avoid this extra 1422 // instantiation in the common case? 1423 T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName()); 1424 assert(!T.isNull() && "Instantiation of injected-class-name cannot fail."); 1425 1426 if (!T->isDependentType()) { 1427 assert(T->isRecordType() && "Instantiation must produce a record type"); 1428 return T->getAs<RecordType>()->getDecl(); 1429 } 1430 1431 // We are performing "partial" template instantiation to create the 1432 // member declarations for the members of a class template 1433 // specialization. Therefore, D is actually referring to something in 1434 // the current instantiation. Look through the current context, 1435 // which contains actual instantiations, to find the instantiation of 1436 // the "current instantiation" that D refers to. 1437 for (DeclContext *DC = CurContext; !DC->isFileContext(); 1438 DC = DC->getParent()) { 1439 if (ClassTemplateSpecializationDecl *Spec 1440 = dyn_cast<ClassTemplateSpecializationDecl>(DC)) 1441 if (isInstantiationOf(ClassTemplate, 1442 Spec->getSpecializedTemplate())) 1443 return Spec; 1444 } 1445 1446 assert(false && 1447 "Unable to find declaration for the current instantiation"); 1448 return Record; 1449 } 1450 1451 // Fall through to deal with other dependent record types (e.g., 1452 // anonymous unions in class templates). 1453 } 1454 1455 if (!ParentDC->isDependentContext()) 1456 return D; 1457 1458 ParentDC = FindInstantiatedContext(ParentDC, TemplateArgs); 1459 if (!ParentDC) 1460 return 0; 1461 1462 if (ParentDC != D->getDeclContext()) { 1463 // We performed some kind of instantiation in the parent context, 1464 // so now we need to look into the instantiated parent context to 1465 // find the instantiation of the declaration D. 1466 NamedDecl *Result = 0; 1467 if (D->getDeclName()) { 1468 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); 1469 Result = findInstantiationOf(Context, D, Found.first, Found.second); 1470 } else { 1471 // Since we don't have a name for the entity we're looking for, 1472 // our only option is to walk through all of the declarations to 1473 // find that name. This will occur in a few cases: 1474 // 1475 // - anonymous struct/union within a template 1476 // - unnamed class/struct/union/enum within a template 1477 // 1478 // FIXME: Find a better way to find these instantiations! 1479 Result = findInstantiationOf(Context, D, 1480 ParentDC->decls_begin(), 1481 ParentDC->decls_end()); 1482 } 1483 1484 assert(Result && "Unable to find instantiation of declaration!"); 1485 D = Result; 1486 } 1487 1488 return D; 1489} 1490 1491/// \brief Performs template instantiation for all implicit template 1492/// instantiations we have seen until this point. 1493void Sema::PerformPendingImplicitInstantiations() { 1494 while (!PendingImplicitInstantiations.empty()) { 1495 PendingImplicitInstantiation Inst = PendingImplicitInstantiations.front(); 1496 PendingImplicitInstantiations.pop_front(); 1497 1498 // Instantiate function definitions 1499 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) { 1500 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function), 1501 Function->getLocation(), *this, 1502 Context.getSourceManager(), 1503 "instantiating function definition"); 1504 1505 if (!Function->getBody()) 1506 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true); 1507 continue; 1508 } 1509 1510 // Instantiate static data member definitions. 1511 VarDecl *Var = cast<VarDecl>(Inst.first); 1512 assert(Var->isStaticDataMember() && "Not a static data member?"); 1513 1514 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var), 1515 Var->getLocation(), *this, 1516 Context.getSourceManager(), 1517 "instantiating static data member " 1518 "definition"); 1519 1520 InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true); 1521 } 1522} 1523