SemaTemplateInstantiateDecl.cpp revision 76852c218a207ef43583515cb835b6e855353a0f
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 "clang/Sema/SemaInternal.h" 13#include "clang/Sema/Lookup.h" 14#include "clang/Sema/PrettyDeclStackTrace.h" 15#include "clang/Sema/Template.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/DeclVisitor.h" 20#include "clang/AST/DependentDiagnostic.h" 21#include "clang/AST/Expr.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/TypeLoc.h" 24#include "clang/Lex/Preprocessor.h" 25 26using namespace clang; 27 28bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl, 29 DeclaratorDecl *NewDecl) { 30 if (!OldDecl->getQualifierLoc()) 31 return false; 32 33 NestedNameSpecifierLoc NewQualifierLoc 34 = SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(), 35 TemplateArgs); 36 37 if (!NewQualifierLoc) 38 return true; 39 40 NewDecl->setQualifierInfo(NewQualifierLoc); 41 return false; 42} 43 44bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl, 45 TagDecl *NewDecl) { 46 if (!OldDecl->getQualifierLoc()) 47 return false; 48 49 NestedNameSpecifierLoc NewQualifierLoc 50 = SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(), 51 TemplateArgs); 52 53 if (!NewQualifierLoc) 54 return true; 55 56 NewDecl->setQualifierInfo(NewQualifierLoc); 57 return false; 58} 59 60// FIXME: Is this still too simple? 61void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs, 62 const Decl *Tmpl, Decl *New) { 63 for (AttrVec::const_iterator i = Tmpl->attr_begin(), e = Tmpl->attr_end(); 64 i != e; ++i) { 65 const Attr *TmplAttr = *i; 66 // FIXME: This should be generalized to more than just the AlignedAttr. 67 if (const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr)) { 68 if (Aligned->isAlignmentDependent()) { 69 // The alignment expression is not potentially evaluated. 70 EnterExpressionEvaluationContext Unevaluated(*this, 71 Sema::Unevaluated); 72 73 if (Aligned->isAlignmentExpr()) { 74 ExprResult Result = SubstExpr(Aligned->getAlignmentExpr(), 75 TemplateArgs); 76 if (!Result.isInvalid()) 77 AddAlignedAttr(Aligned->getLocation(), New, Result.takeAs<Expr>()); 78 } 79 else { 80 TypeSourceInfo *Result = SubstType(Aligned->getAlignmentType(), 81 TemplateArgs, 82 Aligned->getLocation(), 83 DeclarationName()); 84 if (Result) 85 AddAlignedAttr(Aligned->getLocation(), New, Result); 86 } 87 continue; 88 } 89 } 90 91 // FIXME: Is cloning correct for all attributes? 92 Attr *NewAttr = TmplAttr->clone(Context); 93 New->addAttr(NewAttr); 94 } 95} 96 97Decl * 98TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { 99 llvm_unreachable("Translation units cannot be instantiated"); 100} 101 102Decl * 103TemplateDeclInstantiator::VisitLabelDecl(LabelDecl *D) { 104 LabelDecl *Inst = LabelDecl::Create(SemaRef.Context, Owner, D->getLocation(), 105 D->getIdentifier()); 106 Owner->addDecl(Inst); 107 return Inst; 108} 109 110Decl * 111TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { 112 llvm_unreachable("Namespaces cannot be instantiated"); 113} 114 115Decl * 116TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) { 117 NamespaceAliasDecl *Inst 118 = NamespaceAliasDecl::Create(SemaRef.Context, Owner, 119 D->getNamespaceLoc(), 120 D->getAliasLoc(), 121 D->getIdentifier(), 122 D->getQualifierLoc(), 123 D->getTargetNameLoc(), 124 D->getNamespace()); 125 Owner->addDecl(Inst); 126 return Inst; 127} 128 129Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D, 130 bool IsTypeAlias) { 131 bool Invalid = false; 132 TypeSourceInfo *DI = D->getTypeSourceInfo(); 133 if (DI->getType()->isInstantiationDependentType() || 134 DI->getType()->isVariablyModifiedType()) { 135 DI = SemaRef.SubstType(DI, TemplateArgs, 136 D->getLocation(), D->getDeclName()); 137 if (!DI) { 138 Invalid = true; 139 DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy); 140 } 141 } else { 142 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); 143 } 144 145 // Create the new typedef 146 TypedefNameDecl *Typedef; 147 if (IsTypeAlias) 148 Typedef = TypeAliasDecl::Create(SemaRef.Context, Owner, D->getLocStart(), 149 D->getLocation(), D->getIdentifier(), DI); 150 else 151 Typedef = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocStart(), 152 D->getLocation(), D->getIdentifier(), DI); 153 if (Invalid) 154 Typedef->setInvalidDecl(); 155 156 // If the old typedef was the name for linkage purposes of an anonymous 157 // tag decl, re-establish that relationship for the new typedef. 158 if (const TagType *oldTagType = D->getUnderlyingType()->getAs<TagType>()) { 159 TagDecl *oldTag = oldTagType->getDecl(); 160 if (oldTag->getTypedefNameForAnonDecl() == D) { 161 TagDecl *newTag = DI->getType()->castAs<TagType>()->getDecl(); 162 assert(!newTag->getIdentifier() && !newTag->getTypedefNameForAnonDecl()); 163 newTag->setTypedefNameForAnonDecl(Typedef); 164 } 165 } 166 167 if (TypedefNameDecl *Prev = D->getPreviousDeclaration()) { 168 NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev, 169 TemplateArgs); 170 if (!InstPrev) 171 return 0; 172 173 Typedef->setPreviousDeclaration(cast<TypedefNameDecl>(InstPrev)); 174 } 175 176 SemaRef.InstantiateAttrs(TemplateArgs, D, Typedef); 177 178 Typedef->setAccess(D->getAccess()); 179 180 return Typedef; 181} 182 183Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { 184 Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/false); 185 Owner->addDecl(Typedef); 186 return Typedef; 187} 188 189Decl *TemplateDeclInstantiator::VisitTypeAliasDecl(TypeAliasDecl *D) { 190 Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/true); 191 Owner->addDecl(Typedef); 192 return Typedef; 193} 194 195Decl * 196TemplateDeclInstantiator::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) { 197 // Create a local instantiation scope for this type alias template, which 198 // will contain the instantiations of the template parameters. 199 LocalInstantiationScope Scope(SemaRef); 200 201 TemplateParameterList *TempParams = D->getTemplateParameters(); 202 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 203 if (!InstParams) 204 return 0; 205 206 TypeAliasDecl *Pattern = D->getTemplatedDecl(); 207 208 TypeAliasTemplateDecl *PrevAliasTemplate = 0; 209 if (Pattern->getPreviousDeclaration()) { 210 DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName()); 211 if (Found.first != Found.second) { 212 PrevAliasTemplate = dyn_cast<TypeAliasTemplateDecl>(*Found.first); 213 } 214 } 215 216 TypeAliasDecl *AliasInst = cast_or_null<TypeAliasDecl>( 217 InstantiateTypedefNameDecl(Pattern, /*IsTypeAlias=*/true)); 218 if (!AliasInst) 219 return 0; 220 221 TypeAliasTemplateDecl *Inst 222 = TypeAliasTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), 223 D->getDeclName(), InstParams, AliasInst); 224 if (PrevAliasTemplate) 225 Inst->setPreviousDeclaration(PrevAliasTemplate); 226 227 Inst->setAccess(D->getAccess()); 228 229 if (!PrevAliasTemplate) 230 Inst->setInstantiatedFromMemberTemplate(D); 231 232 Owner->addDecl(Inst); 233 234 return Inst; 235} 236 237/// \brief Instantiate an initializer, breaking it into separate 238/// initialization arguments. 239/// 240/// \param Init The initializer to instantiate. 241/// 242/// \param TemplateArgs Template arguments to be substituted into the 243/// initializer. 244/// 245/// \param NewArgs Will be filled in with the instantiation arguments. 246/// 247/// \returns true if an error occurred, false otherwise 248bool Sema::InstantiateInitializer(Expr *Init, 249 const MultiLevelTemplateArgumentList &TemplateArgs, 250 SourceLocation &LParenLoc, 251 ASTOwningVector<Expr*> &NewArgs, 252 SourceLocation &RParenLoc) { 253 NewArgs.clear(); 254 LParenLoc = SourceLocation(); 255 RParenLoc = SourceLocation(); 256 257 if (!Init) 258 return false; 259 260 if (ExprWithCleanups *ExprTemp = dyn_cast<ExprWithCleanups>(Init)) 261 Init = ExprTemp->getSubExpr(); 262 263 while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(Init)) 264 Init = Binder->getSubExpr(); 265 266 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Init)) 267 Init = ICE->getSubExprAsWritten(); 268 269 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 270 LParenLoc = ParenList->getLParenLoc(); 271 RParenLoc = ParenList->getRParenLoc(); 272 return SubstExprs(ParenList->getExprs(), ParenList->getNumExprs(), 273 true, TemplateArgs, NewArgs); 274 } 275 276 if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init)) { 277 if (!isa<CXXTemporaryObjectExpr>(Construct)) { 278 if (SubstExprs(Construct->getArgs(), Construct->getNumArgs(), true, 279 TemplateArgs, NewArgs)) 280 return true; 281 282 // FIXME: Fake locations! 283 LParenLoc = PP.getLocForEndOfToken(Init->getLocStart()); 284 RParenLoc = LParenLoc; 285 return false; 286 } 287 } 288 289 ExprResult Result = SubstExpr(Init, TemplateArgs); 290 if (Result.isInvalid()) 291 return true; 292 293 NewArgs.push_back(Result.takeAs<Expr>()); 294 return false; 295} 296 297Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { 298 // If this is the variable for an anonymous struct or union, 299 // instantiate the anonymous struct/union type first. 300 if (const RecordType *RecordTy = D->getType()->getAs<RecordType>()) 301 if (RecordTy->getDecl()->isAnonymousStructOrUnion()) 302 if (!VisitCXXRecordDecl(cast<CXXRecordDecl>(RecordTy->getDecl()))) 303 return 0; 304 305 // Do substitution on the type of the declaration 306 TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(), 307 TemplateArgs, 308 D->getTypeSpecStartLoc(), 309 D->getDeclName()); 310 if (!DI) 311 return 0; 312 313 if (DI->getType()->isFunctionType()) { 314 SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function) 315 << D->isStaticDataMember() << DI->getType(); 316 return 0; 317 } 318 319 // Build the instantiated declaration 320 VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, 321 D->getInnerLocStart(), 322 D->getLocation(), D->getIdentifier(), 323 DI->getType(), DI, 324 D->getStorageClass(), 325 D->getStorageClassAsWritten()); 326 Var->setThreadSpecified(D->isThreadSpecified()); 327 Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); 328 Var->setCXXForRangeDecl(D->isCXXForRangeDecl()); 329 330 // Substitute the nested name specifier, if any. 331 if (SubstQualifier(D, Var)) 332 return 0; 333 334 // If we are instantiating a static data member defined 335 // out-of-line, the instantiation will have the same lexical 336 // context (which will be a namespace scope) as the template. 337 if (D->isOutOfLine()) 338 Var->setLexicalDeclContext(D->getLexicalDeclContext()); 339 340 Var->setAccess(D->getAccess()); 341 342 if (!D->isStaticDataMember()) { 343 Var->setUsed(D->isUsed(false)); 344 Var->setReferenced(D->isReferenced()); 345 } 346 347 // FIXME: In theory, we could have a previous declaration for variables that 348 // are not static data members. 349 // FIXME: having to fake up a LookupResult is dumb. 350 LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(), 351 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 352 if (D->isStaticDataMember()) 353 SemaRef.LookupQualifiedName(Previous, Owner, false); 354 SemaRef.CheckVariableDeclaration(Var, Previous); 355 356 if (D->isOutOfLine()) { 357 if (!D->isStaticDataMember()) 358 D->getLexicalDeclContext()->addDecl(Var); 359 Owner->makeDeclVisibleInContext(Var); 360 } else { 361 Owner->addDecl(Var); 362 if (Owner->isFunctionOrMethod()) 363 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Var); 364 } 365 SemaRef.InstantiateAttrs(TemplateArgs, D, Var); 366 367 // Link instantiations of static data members back to the template from 368 // which they were instantiated. 369 if (Var->isStaticDataMember()) 370 SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D, 371 TSK_ImplicitInstantiation); 372 373 if (Var->getAnyInitializer()) { 374 // We already have an initializer in the class. 375 } else if (D->getInit()) { 376 if (Var->isStaticDataMember() && !D->isOutOfLine()) 377 SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated); 378 else 379 SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 380 381 // Instantiate the initializer. 382 SourceLocation LParenLoc, RParenLoc; 383 ASTOwningVector<Expr*> InitArgs(SemaRef); 384 if (!SemaRef.InstantiateInitializer(D->getInit(), TemplateArgs, LParenLoc, 385 InitArgs, RParenLoc)) { 386 bool TypeMayContainAuto = true; 387 // Attach the initializer to the declaration, if we have one. 388 if (InitArgs.size() == 0) 389 SemaRef.ActOnUninitializedDecl(Var, TypeMayContainAuto); 390 else if (D->hasCXXDirectInitializer()) { 391 // Add the direct initializer to the declaration. 392 SemaRef.AddCXXDirectInitializerToDecl(Var, 393 LParenLoc, 394 move_arg(InitArgs), 395 RParenLoc, 396 TypeMayContainAuto); 397 } else { 398 assert(InitArgs.size() == 1); 399 Expr *Init = InitArgs.take()[0]; 400 SemaRef.AddInitializerToDecl(Var, Init, false, TypeMayContainAuto); 401 } 402 } else { 403 // FIXME: Not too happy about invalidating the declaration 404 // because of a bogus initializer. 405 Var->setInvalidDecl(); 406 } 407 408 SemaRef.PopExpressionEvaluationContext(); 409 } else if ((!Var->isStaticDataMember() || Var->isOutOfLine()) && 410 !Var->isCXXForRangeDecl()) 411 SemaRef.ActOnUninitializedDecl(Var, false); 412 413 // Diagnose unused local variables with dependent types, where the diagnostic 414 // will have been deferred. 415 if (!Var->isInvalidDecl() && Owner->isFunctionOrMethod() && !Var->isUsed() && 416 D->getType()->isDependentType()) 417 SemaRef.DiagnoseUnusedDecl(Var); 418 419 return Var; 420} 421 422Decl *TemplateDeclInstantiator::VisitAccessSpecDecl(AccessSpecDecl *D) { 423 AccessSpecDecl* AD 424 = AccessSpecDecl::Create(SemaRef.Context, D->getAccess(), Owner, 425 D->getAccessSpecifierLoc(), D->getColonLoc()); 426 Owner->addHiddenDecl(AD); 427 return AD; 428} 429 430Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { 431 bool Invalid = false; 432 TypeSourceInfo *DI = D->getTypeSourceInfo(); 433 if (DI->getType()->isInstantiationDependentType() || 434 DI->getType()->isVariablyModifiedType()) { 435 DI = SemaRef.SubstType(DI, TemplateArgs, 436 D->getLocation(), D->getDeclName()); 437 if (!DI) { 438 DI = D->getTypeSourceInfo(); 439 Invalid = true; 440 } else if (DI->getType()->isFunctionType()) { 441 // C++ [temp.arg.type]p3: 442 // If a declaration acquires a function type through a type 443 // dependent on a template-parameter and this causes a 444 // declaration that does not use the syntactic form of a 445 // function declarator to have function type, the program is 446 // ill-formed. 447 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) 448 << DI->getType(); 449 Invalid = true; 450 } 451 } else { 452 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); 453 } 454 455 Expr *BitWidth = D->getBitWidth(); 456 if (Invalid) 457 BitWidth = 0; 458 else if (BitWidth) { 459 // The bit-width expression is not potentially evaluated. 460 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated); 461 462 ExprResult InstantiatedBitWidth 463 = SemaRef.SubstExpr(BitWidth, TemplateArgs); 464 if (InstantiatedBitWidth.isInvalid()) { 465 Invalid = true; 466 BitWidth = 0; 467 } else 468 BitWidth = InstantiatedBitWidth.takeAs<Expr>(); 469 } 470 471 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), 472 DI->getType(), DI, 473 cast<RecordDecl>(Owner), 474 D->getLocation(), 475 D->isMutable(), 476 BitWidth, 477 D->hasInClassInitializer(), 478 D->getTypeSpecStartLoc(), 479 D->getAccess(), 480 0); 481 if (!Field) { 482 cast<Decl>(Owner)->setInvalidDecl(); 483 return 0; 484 } 485 486 SemaRef.InstantiateAttrs(TemplateArgs, D, Field); 487 488 if (Invalid) 489 Field->setInvalidDecl(); 490 491 if (!Field->getDeclName()) { 492 // Keep track of where this decl came from. 493 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); 494 } 495 if (CXXRecordDecl *Parent= dyn_cast<CXXRecordDecl>(Field->getDeclContext())) { 496 if (Parent->isAnonymousStructOrUnion() && 497 Parent->getRedeclContext()->isFunctionOrMethod()) 498 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Field); 499 } 500 501 Field->setImplicit(D->isImplicit()); 502 Field->setAccess(D->getAccess()); 503 Owner->addDecl(Field); 504 505 return Field; 506} 507 508Decl *TemplateDeclInstantiator::VisitIndirectFieldDecl(IndirectFieldDecl *D) { 509 NamedDecl **NamedChain = 510 new (SemaRef.Context)NamedDecl*[D->getChainingSize()]; 511 512 int i = 0; 513 for (IndirectFieldDecl::chain_iterator PI = 514 D->chain_begin(), PE = D->chain_end(); 515 PI != PE; ++PI) { 516 NamedDecl *Next = SemaRef.FindInstantiatedDecl(D->getLocation(), *PI, 517 TemplateArgs); 518 if (!Next) 519 return 0; 520 521 NamedChain[i++] = Next; 522 } 523 524 QualType T = cast<FieldDecl>(NamedChain[i-1])->getType(); 525 IndirectFieldDecl* IndirectField 526 = IndirectFieldDecl::Create(SemaRef.Context, Owner, D->getLocation(), 527 D->getIdentifier(), T, 528 NamedChain, D->getChainingSize()); 529 530 531 IndirectField->setImplicit(D->isImplicit()); 532 IndirectField->setAccess(D->getAccess()); 533 Owner->addDecl(IndirectField); 534 return IndirectField; 535} 536 537Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { 538 // Handle friend type expressions by simply substituting template 539 // parameters into the pattern type and checking the result. 540 if (TypeSourceInfo *Ty = D->getFriendType()) { 541 TypeSourceInfo *InstTy; 542 // If this is an unsupported friend, don't bother substituting template 543 // arguments into it. The actual type referred to won't be used by any 544 // parts of Clang, and may not be valid for instantiating. Just use the 545 // same info for the instantiated friend. 546 if (D->isUnsupportedFriend()) { 547 InstTy = Ty; 548 } else { 549 InstTy = SemaRef.SubstType(Ty, TemplateArgs, 550 D->getLocation(), DeclarationName()); 551 } 552 if (!InstTy) 553 return 0; 554 555 FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getLocation(), 556 D->getFriendLoc(), InstTy); 557 if (!FD) 558 return 0; 559 560 FD->setAccess(AS_public); 561 FD->setUnsupportedFriend(D->isUnsupportedFriend()); 562 Owner->addDecl(FD); 563 return FD; 564 } 565 566 NamedDecl *ND = D->getFriendDecl(); 567 assert(ND && "friend decl must be a decl or a type!"); 568 569 // All of the Visit implementations for the various potential friend 570 // declarations have to be carefully written to work for friend 571 // objects, with the most important detail being that the target 572 // decl should almost certainly not be placed in Owner. 573 Decl *NewND = Visit(ND); 574 if (!NewND) return 0; 575 576 FriendDecl *FD = 577 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), 578 cast<NamedDecl>(NewND), D->getFriendLoc()); 579 FD->setAccess(AS_public); 580 FD->setUnsupportedFriend(D->isUnsupportedFriend()); 581 Owner->addDecl(FD); 582 return FD; 583} 584 585Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { 586 Expr *AssertExpr = D->getAssertExpr(); 587 588 // The expression in a static assertion is not potentially evaluated. 589 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated); 590 591 ExprResult InstantiatedAssertExpr 592 = SemaRef.SubstExpr(AssertExpr, TemplateArgs); 593 if (InstantiatedAssertExpr.isInvalid()) 594 return 0; 595 596 ExprResult Message(D->getMessage()); 597 D->getMessage(); 598 return SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), 599 InstantiatedAssertExpr.get(), 600 Message.get(), 601 D->getRParenLoc()); 602} 603 604Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { 605 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, D->getLocStart(), 606 D->getLocation(), D->getIdentifier(), 607 /*PrevDecl=*/0, D->isScoped(), 608 D->isScopedUsingClassTag(), D->isFixed()); 609 if (D->isFixed()) { 610 if (TypeSourceInfo* TI = D->getIntegerTypeSourceInfo()) { 611 // If we have type source information for the underlying type, it means it 612 // has been explicitly set by the user. Perform substitution on it before 613 // moving on. 614 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 615 Enum->setIntegerTypeSourceInfo(SemaRef.SubstType(TI, 616 TemplateArgs, 617 UnderlyingLoc, 618 DeclarationName())); 619 620 if (!Enum->getIntegerTypeSourceInfo()) 621 Enum->setIntegerType(SemaRef.Context.IntTy); 622 } 623 else { 624 assert(!D->getIntegerType()->isDependentType() 625 && "Dependent type without type source info"); 626 Enum->setIntegerType(D->getIntegerType()); 627 } 628 } 629 630 SemaRef.InstantiateAttrs(TemplateArgs, D, Enum); 631 632 Enum->setInstantiationOfMemberEnum(D); 633 Enum->setAccess(D->getAccess()); 634 if (SubstQualifier(D, Enum)) return 0; 635 Owner->addDecl(Enum); 636 Enum->startDefinition(); 637 638 if (D->getDeclContext()->isFunctionOrMethod()) 639 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum); 640 641 SmallVector<Decl*, 4> Enumerators; 642 643 EnumConstantDecl *LastEnumConst = 0; 644 for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), 645 ECEnd = D->enumerator_end(); 646 EC != ECEnd; ++EC) { 647 // The specified value for the enumerator. 648 ExprResult Value = SemaRef.Owned((Expr *)0); 649 if (Expr *UninstValue = EC->getInitExpr()) { 650 // The enumerator's value expression is not potentially evaluated. 651 EnterExpressionEvaluationContext Unevaluated(SemaRef, 652 Sema::Unevaluated); 653 654 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); 655 } 656 657 // Drop the initial value and continue. 658 bool isInvalid = false; 659 if (Value.isInvalid()) { 660 Value = SemaRef.Owned((Expr *)0); 661 isInvalid = true; 662 } 663 664 EnumConstantDecl *EnumConst 665 = SemaRef.CheckEnumConstant(Enum, LastEnumConst, 666 EC->getLocation(), EC->getIdentifier(), 667 Value.get()); 668 669 if (isInvalid) { 670 if (EnumConst) 671 EnumConst->setInvalidDecl(); 672 Enum->setInvalidDecl(); 673 } 674 675 if (EnumConst) { 676 SemaRef.InstantiateAttrs(TemplateArgs, *EC, EnumConst); 677 678 EnumConst->setAccess(Enum->getAccess()); 679 Enum->addDecl(EnumConst); 680 Enumerators.push_back(EnumConst); 681 LastEnumConst = EnumConst; 682 683 if (D->getDeclContext()->isFunctionOrMethod()) { 684 // If the enumeration is within a function or method, record the enum 685 // constant as a local. 686 SemaRef.CurrentInstantiationScope->InstantiatedLocal(*EC, EnumConst); 687 } 688 } 689 } 690 691 // FIXME: Fixup LBraceLoc and RBraceLoc 692 // FIXME: Empty Scope and AttributeList (required to handle attribute packed). 693 SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), 694 Enum, 695 Enumerators.data(), Enumerators.size(), 696 0, 0); 697 698 return Enum; 699} 700 701Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { 702 llvm_unreachable("EnumConstantDecls can only occur within EnumDecls."); 703} 704 705Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { 706 bool isFriend = (D->getFriendObjectKind() != Decl::FOK_None); 707 708 // Create a local instantiation scope for this class template, which 709 // will contain the instantiations of the template parameters. 710 LocalInstantiationScope Scope(SemaRef); 711 TemplateParameterList *TempParams = D->getTemplateParameters(); 712 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 713 if (!InstParams) 714 return NULL; 715 716 CXXRecordDecl *Pattern = D->getTemplatedDecl(); 717 718 // Instantiate the qualifier. We have to do this first in case 719 // we're a friend declaration, because if we are then we need to put 720 // the new declaration in the appropriate context. 721 NestedNameSpecifierLoc QualifierLoc = Pattern->getQualifierLoc(); 722 if (QualifierLoc) { 723 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, 724 TemplateArgs); 725 if (!QualifierLoc) 726 return 0; 727 } 728 729 CXXRecordDecl *PrevDecl = 0; 730 ClassTemplateDecl *PrevClassTemplate = 0; 731 732 if (!isFriend && Pattern->getPreviousDeclaration()) { 733 DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName()); 734 if (Found.first != Found.second) { 735 PrevClassTemplate = dyn_cast<ClassTemplateDecl>(*Found.first); 736 if (PrevClassTemplate) 737 PrevDecl = PrevClassTemplate->getTemplatedDecl(); 738 } 739 } 740 741 // If this isn't a friend, then it's a member template, in which 742 // case we just want to build the instantiation in the 743 // specialization. If it is a friend, we want to build it in 744 // the appropriate context. 745 DeclContext *DC = Owner; 746 if (isFriend) { 747 if (QualifierLoc) { 748 CXXScopeSpec SS; 749 SS.Adopt(QualifierLoc); 750 DC = SemaRef.computeDeclContext(SS); 751 if (!DC) return 0; 752 } else { 753 DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(), 754 Pattern->getDeclContext(), 755 TemplateArgs); 756 } 757 758 // Look for a previous declaration of the template in the owning 759 // context. 760 LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(), 761 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 762 SemaRef.LookupQualifiedName(R, DC); 763 764 if (R.isSingleResult()) { 765 PrevClassTemplate = R.getAsSingle<ClassTemplateDecl>(); 766 if (PrevClassTemplate) 767 PrevDecl = PrevClassTemplate->getTemplatedDecl(); 768 } 769 770 if (!PrevClassTemplate && QualifierLoc) { 771 SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope) 772 << D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC 773 << QualifierLoc.getSourceRange(); 774 return 0; 775 } 776 777 bool AdoptedPreviousTemplateParams = false; 778 if (PrevClassTemplate) { 779 bool Complain = true; 780 781 // HACK: libstdc++ 4.2.1 contains an ill-formed friend class 782 // template for struct std::tr1::__detail::_Map_base, where the 783 // template parameters of the friend declaration don't match the 784 // template parameters of the original declaration. In this one 785 // case, we don't complain about the ill-formed friend 786 // declaration. 787 if (isFriend && Pattern->getIdentifier() && 788 Pattern->getIdentifier()->isStr("_Map_base") && 789 DC->isNamespace() && 790 cast<NamespaceDecl>(DC)->getIdentifier() && 791 cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__detail")) { 792 DeclContext *DCParent = DC->getParent(); 793 if (DCParent->isNamespace() && 794 cast<NamespaceDecl>(DCParent)->getIdentifier() && 795 cast<NamespaceDecl>(DCParent)->getIdentifier()->isStr("tr1")) { 796 DeclContext *DCParent2 = DCParent->getParent(); 797 if (DCParent2->isNamespace() && 798 cast<NamespaceDecl>(DCParent2)->getIdentifier() && 799 cast<NamespaceDecl>(DCParent2)->getIdentifier()->isStr("std") && 800 DCParent2->getParent()->isTranslationUnit()) 801 Complain = false; 802 } 803 } 804 805 TemplateParameterList *PrevParams 806 = PrevClassTemplate->getTemplateParameters(); 807 808 // Make sure the parameter lists match. 809 if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams, 810 Complain, 811 Sema::TPL_TemplateMatch)) { 812 if (Complain) 813 return 0; 814 815 AdoptedPreviousTemplateParams = true; 816 InstParams = PrevParams; 817 } 818 819 // Do some additional validation, then merge default arguments 820 // from the existing declarations. 821 if (!AdoptedPreviousTemplateParams && 822 SemaRef.CheckTemplateParameterList(InstParams, PrevParams, 823 Sema::TPC_ClassTemplate)) 824 return 0; 825 } 826 } 827 828 CXXRecordDecl *RecordInst 829 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC, 830 Pattern->getLocStart(), Pattern->getLocation(), 831 Pattern->getIdentifier(), PrevDecl, 832 /*DelayTypeCreation=*/true); 833 834 if (QualifierLoc) 835 RecordInst->setQualifierInfo(QualifierLoc); 836 837 ClassTemplateDecl *Inst 838 = ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(), 839 D->getIdentifier(), InstParams, RecordInst, 840 PrevClassTemplate); 841 RecordInst->setDescribedClassTemplate(Inst); 842 843 if (isFriend) { 844 if (PrevClassTemplate) 845 Inst->setAccess(PrevClassTemplate->getAccess()); 846 else 847 Inst->setAccess(D->getAccess()); 848 849 Inst->setObjectOfFriendDecl(PrevClassTemplate != 0); 850 // TODO: do we want to track the instantiation progeny of this 851 // friend target decl? 852 } else { 853 Inst->setAccess(D->getAccess()); 854 if (!PrevClassTemplate) 855 Inst->setInstantiatedFromMemberTemplate(D); 856 } 857 858 // Trigger creation of the type for the instantiation. 859 SemaRef.Context.getInjectedClassNameType(RecordInst, 860 Inst->getInjectedClassNameSpecialization()); 861 862 // Finish handling of friends. 863 if (isFriend) { 864 DC->makeDeclVisibleInContext(Inst, /*Recoverable*/ false); 865 return Inst; 866 } 867 868 Owner->addDecl(Inst); 869 870 if (!PrevClassTemplate) { 871 // Queue up any out-of-line partial specializations of this member 872 // class template; the client will force their instantiation once 873 // the enclosing class has been instantiated. 874 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 875 D->getPartialSpecializations(PartialSpecs); 876 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) 877 if (PartialSpecs[I]->isOutOfLine()) 878 OutOfLinePartialSpecs.push_back(std::make_pair(Inst, PartialSpecs[I])); 879 } 880 881 return Inst; 882} 883 884Decl * 885TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( 886 ClassTemplatePartialSpecializationDecl *D) { 887 ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); 888 889 // Lookup the already-instantiated declaration in the instantiation 890 // of the class template and return that. 891 DeclContext::lookup_result Found 892 = Owner->lookup(ClassTemplate->getDeclName()); 893 if (Found.first == Found.second) 894 return 0; 895 896 ClassTemplateDecl *InstClassTemplate 897 = dyn_cast<ClassTemplateDecl>(*Found.first); 898 if (!InstClassTemplate) 899 return 0; 900 901 if (ClassTemplatePartialSpecializationDecl *Result 902 = InstClassTemplate->findPartialSpecInstantiatedFromMember(D)) 903 return Result; 904 905 return InstantiateClassTemplatePartialSpecialization(InstClassTemplate, D); 906} 907 908Decl * 909TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { 910 // Create a local instantiation scope for this function template, which 911 // will contain the instantiations of the template parameters and then get 912 // merged with the local instantiation scope for the function template 913 // itself. 914 LocalInstantiationScope Scope(SemaRef); 915 916 TemplateParameterList *TempParams = D->getTemplateParameters(); 917 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 918 if (!InstParams) 919 return NULL; 920 921 FunctionDecl *Instantiated = 0; 922 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl())) 923 Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod, 924 InstParams)); 925 else 926 Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl( 927 D->getTemplatedDecl(), 928 InstParams)); 929 930 if (!Instantiated) 931 return 0; 932 933 Instantiated->setAccess(D->getAccess()); 934 935 // Link the instantiated function template declaration to the function 936 // template from which it was instantiated. 937 FunctionTemplateDecl *InstTemplate 938 = Instantiated->getDescribedFunctionTemplate(); 939 InstTemplate->setAccess(D->getAccess()); 940 assert(InstTemplate && 941 "VisitFunctionDecl/CXXMethodDecl didn't create a template!"); 942 943 bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None); 944 945 // Link the instantiation back to the pattern *unless* this is a 946 // non-definition friend declaration. 947 if (!InstTemplate->getInstantiatedFromMemberTemplate() && 948 !(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition())) 949 InstTemplate->setInstantiatedFromMemberTemplate(D); 950 951 // Make declarations visible in the appropriate context. 952 if (!isFriend) 953 Owner->addDecl(InstTemplate); 954 955 return InstTemplate; 956} 957 958Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { 959 CXXRecordDecl *PrevDecl = 0; 960 if (D->isInjectedClassName()) 961 PrevDecl = cast<CXXRecordDecl>(Owner); 962 else if (D->getPreviousDeclaration()) { 963 NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(), 964 D->getPreviousDeclaration(), 965 TemplateArgs); 966 if (!Prev) return 0; 967 PrevDecl = cast<CXXRecordDecl>(Prev); 968 } 969 970 CXXRecordDecl *Record 971 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, 972 D->getLocStart(), D->getLocation(), 973 D->getIdentifier(), PrevDecl); 974 975 // Substitute the nested name specifier, if any. 976 if (SubstQualifier(D, Record)) 977 return 0; 978 979 Record->setImplicit(D->isImplicit()); 980 // FIXME: Check against AS_none is an ugly hack to work around the issue that 981 // the tag decls introduced by friend class declarations don't have an access 982 // specifier. Remove once this area of the code gets sorted out. 983 if (D->getAccess() != AS_none) 984 Record->setAccess(D->getAccess()); 985 if (!D->isInjectedClassName()) 986 Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); 987 988 // If the original function was part of a friend declaration, 989 // inherit its namespace state. 990 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) 991 Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); 992 993 // Make sure that anonymous structs and unions are recorded. 994 if (D->isAnonymousStructOrUnion()) { 995 Record->setAnonymousStructOrUnion(true); 996 if (Record->getDeclContext()->getRedeclContext()->isFunctionOrMethod()) 997 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record); 998 } 999 1000 Owner->addDecl(Record); 1001 return Record; 1002} 1003 1004/// Normal class members are of more specific types and therefore 1005/// don't make it here. This function serves two purposes: 1006/// 1) instantiating function templates 1007/// 2) substituting friend declarations 1008/// FIXME: preserve function definitions in case #2 1009Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, 1010 TemplateParameterList *TemplateParams) { 1011 // Check whether there is already a function template specialization for 1012 // this declaration. 1013 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 1014 void *InsertPos = 0; 1015 if (FunctionTemplate && !TemplateParams) { 1016 std::pair<const TemplateArgument *, unsigned> Innermost 1017 = TemplateArgs.getInnermost(); 1018 1019 FunctionDecl *SpecFunc 1020 = FunctionTemplate->findSpecialization(Innermost.first, Innermost.second, 1021 InsertPos); 1022 1023 // If we already have a function template specialization, return it. 1024 if (SpecFunc) 1025 return SpecFunc; 1026 } 1027 1028 bool isFriend; 1029 if (FunctionTemplate) 1030 isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); 1031 else 1032 isFriend = (D->getFriendObjectKind() != Decl::FOK_None); 1033 1034 bool MergeWithParentScope = (TemplateParams != 0) || 1035 Owner->isFunctionOrMethod() || 1036 !(isa<Decl>(Owner) && 1037 cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod()); 1038 LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); 1039 1040 SmallVector<ParmVarDecl *, 4> Params; 1041 TypeSourceInfo *TInfo = D->getTypeSourceInfo(); 1042 TInfo = SubstFunctionType(D, Params); 1043 if (!TInfo) 1044 return 0; 1045 QualType T = TInfo->getType(); 1046 1047 NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc(); 1048 if (QualifierLoc) { 1049 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, 1050 TemplateArgs); 1051 if (!QualifierLoc) 1052 return 0; 1053 } 1054 1055 // If we're instantiating a local function declaration, put the result 1056 // in the owner; otherwise we need to find the instantiated context. 1057 DeclContext *DC; 1058 if (D->getDeclContext()->isFunctionOrMethod()) 1059 DC = Owner; 1060 else if (isFriend && QualifierLoc) { 1061 CXXScopeSpec SS; 1062 SS.Adopt(QualifierLoc); 1063 DC = SemaRef.computeDeclContext(SS); 1064 if (!DC) return 0; 1065 } else { 1066 DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(), 1067 TemplateArgs); 1068 } 1069 1070 FunctionDecl *Function = 1071 FunctionDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(), 1072 D->getLocation(), D->getDeclName(), T, TInfo, 1073 D->getStorageClass(), D->getStorageClassAsWritten(), 1074 D->isInlineSpecified(), D->hasWrittenPrototype(), 1075 /*isConstexpr*/ false); 1076 1077 if (QualifierLoc) 1078 Function->setQualifierInfo(QualifierLoc); 1079 1080 DeclContext *LexicalDC = Owner; 1081 if (!isFriend && D->isOutOfLine()) { 1082 assert(D->getDeclContext()->isFileContext()); 1083 LexicalDC = D->getDeclContext(); 1084 } 1085 1086 Function->setLexicalDeclContext(LexicalDC); 1087 1088 // Attach the parameters 1089 if (isa<FunctionProtoType>(Function->getType().IgnoreParens())) { 1090 // Adopt the already-instantiated parameters into our own context. 1091 for (unsigned P = 0; P < Params.size(); ++P) 1092 if (Params[P]) 1093 Params[P]->setOwningFunction(Function); 1094 } else { 1095 // Since we were instantiated via a typedef of a function type, create 1096 // new parameters. 1097 const FunctionProtoType *Proto 1098 = Function->getType()->getAs<FunctionProtoType>(); 1099 assert(Proto && "No function prototype in template instantiation?"); 1100 for (FunctionProtoType::arg_type_iterator AI = Proto->arg_type_begin(), 1101 AE = Proto->arg_type_end(); AI != AE; ++AI) { 1102 ParmVarDecl *Param 1103 = SemaRef.BuildParmVarDeclForTypedef(Function, Function->getLocation(), 1104 *AI); 1105 Param->setScopeInfo(0, Params.size()); 1106 Params.push_back(Param); 1107 } 1108 } 1109 Function->setParams(Params); 1110 1111 SourceLocation InstantiateAtPOI; 1112 if (TemplateParams) { 1113 // Our resulting instantiation is actually a function template, since we 1114 // are substituting only the outer template parameters. For example, given 1115 // 1116 // template<typename T> 1117 // struct X { 1118 // template<typename U> friend void f(T, U); 1119 // }; 1120 // 1121 // X<int> x; 1122 // 1123 // We are instantiating the friend function template "f" within X<int>, 1124 // which means substituting int for T, but leaving "f" as a friend function 1125 // template. 1126 // Build the function template itself. 1127 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC, 1128 Function->getLocation(), 1129 Function->getDeclName(), 1130 TemplateParams, Function); 1131 Function->setDescribedFunctionTemplate(FunctionTemplate); 1132 1133 FunctionTemplate->setLexicalDeclContext(LexicalDC); 1134 1135 if (isFriend && D->isThisDeclarationADefinition()) { 1136 // TODO: should we remember this connection regardless of whether 1137 // the friend declaration provided a body? 1138 FunctionTemplate->setInstantiatedFromMemberTemplate( 1139 D->getDescribedFunctionTemplate()); 1140 } 1141 } else if (FunctionTemplate) { 1142 // Record this function template specialization. 1143 std::pair<const TemplateArgument *, unsigned> Innermost 1144 = TemplateArgs.getInnermost(); 1145 Function->setFunctionTemplateSpecialization(FunctionTemplate, 1146 TemplateArgumentList::CreateCopy(SemaRef.Context, 1147 Innermost.first, 1148 Innermost.second), 1149 InsertPos); 1150 } else if (isFriend) { 1151 // Note, we need this connection even if the friend doesn't have a body. 1152 // Its body may exist but not have been attached yet due to deferred 1153 // parsing. 1154 // FIXME: It might be cleaner to set this when attaching the body to the 1155 // friend function declaration, however that would require finding all the 1156 // instantiations and modifying them. 1157 Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 1158 } 1159 1160 if (InitFunctionInstantiation(Function, D)) 1161 Function->setInvalidDecl(); 1162 1163 bool isExplicitSpecialization = false; 1164 1165 LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(), 1166 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 1167 1168 if (DependentFunctionTemplateSpecializationInfo *Info 1169 = D->getDependentSpecializationInfo()) { 1170 assert(isFriend && "non-friend has dependent specialization info?"); 1171 1172 // This needs to be set now for future sanity. 1173 Function->setObjectOfFriendDecl(/*HasPrevious*/ true); 1174 1175 // Instantiate the explicit template arguments. 1176 TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(), 1177 Info->getRAngleLoc()); 1178 if (SemaRef.Subst(Info->getTemplateArgs(), Info->getNumTemplateArgs(), 1179 ExplicitArgs, TemplateArgs)) 1180 return 0; 1181 1182 // Map the candidate templates to their instantiations. 1183 for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) { 1184 Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(), 1185 Info->getTemplate(I), 1186 TemplateArgs); 1187 if (!Temp) return 0; 1188 1189 Previous.addDecl(cast<FunctionTemplateDecl>(Temp)); 1190 } 1191 1192 if (SemaRef.CheckFunctionTemplateSpecialization(Function, 1193 &ExplicitArgs, 1194 Previous)) 1195 Function->setInvalidDecl(); 1196 1197 isExplicitSpecialization = true; 1198 1199 } else if (TemplateParams || !FunctionTemplate) { 1200 // Look only into the namespace where the friend would be declared to 1201 // find a previous declaration. This is the innermost enclosing namespace, 1202 // as described in ActOnFriendFunctionDecl. 1203 SemaRef.LookupQualifiedName(Previous, DC); 1204 1205 // In C++, the previous declaration we find might be a tag type 1206 // (class or enum). In this case, the new declaration will hide the 1207 // tag type. Note that this does does not apply if we're declaring a 1208 // typedef (C++ [dcl.typedef]p4). 1209 if (Previous.isSingleTagDecl()) 1210 Previous.clear(); 1211 } 1212 1213 SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous, 1214 isExplicitSpecialization); 1215 1216 NamedDecl *PrincipalDecl = (TemplateParams 1217 ? cast<NamedDecl>(FunctionTemplate) 1218 : Function); 1219 1220 // If the original function was part of a friend declaration, 1221 // inherit its namespace state and add it to the owner. 1222 if (isFriend) { 1223 NamedDecl *PrevDecl; 1224 if (TemplateParams) 1225 PrevDecl = FunctionTemplate->getPreviousDeclaration(); 1226 else 1227 PrevDecl = Function->getPreviousDeclaration(); 1228 1229 PrincipalDecl->setObjectOfFriendDecl(PrevDecl != 0); 1230 DC->makeDeclVisibleInContext(PrincipalDecl, /*Recoverable=*/ false); 1231 1232 bool queuedInstantiation = false; 1233 1234 // C++98 [temp.friend]p5: When a function is defined in a friend function 1235 // declaration in a class template, the function is defined at each 1236 // instantiation of the class template. The function is defined even if it 1237 // is never used. 1238 // C++11 [temp.friend]p4: When a function is defined in a friend function 1239 // declaration in a class template, the function is instantiated when the 1240 // function is odr-used. 1241 // 1242 // If -Wc++98-compat is enabled, we go through the motions of checking for a 1243 // redefinition, but don't instantiate the function. 1244 if ((!SemaRef.getLangOptions().CPlusPlus0x || 1245 SemaRef.Diags.getDiagnosticLevel( 1246 diag::warn_cxx98_compat_friend_redefinition, 1247 Function->getLocation()) 1248 != DiagnosticsEngine::Ignored) && 1249 D->isThisDeclarationADefinition()) { 1250 // Check for a function body. 1251 const FunctionDecl *Definition = 0; 1252 if (Function->isDefined(Definition) && 1253 Definition->getTemplateSpecializationKind() == TSK_Undeclared) { 1254 SemaRef.Diag(Function->getLocation(), 1255 SemaRef.getLangOptions().CPlusPlus0x ? 1256 diag::warn_cxx98_compat_friend_redefinition : 1257 diag::err_redefinition) << Function->getDeclName(); 1258 SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition); 1259 if (!SemaRef.getLangOptions().CPlusPlus0x) 1260 Function->setInvalidDecl(); 1261 } 1262 // Check for redefinitions due to other instantiations of this or 1263 // a similar friend function. 1264 else for (FunctionDecl::redecl_iterator R = Function->redecls_begin(), 1265 REnd = Function->redecls_end(); 1266 R != REnd; ++R) { 1267 if (*R == Function) 1268 continue; 1269 switch (R->getFriendObjectKind()) { 1270 case Decl::FOK_None: 1271 if (!SemaRef.getLangOptions().CPlusPlus0x && 1272 !queuedInstantiation && R->isUsed(false)) { 1273 if (MemberSpecializationInfo *MSInfo 1274 = Function->getMemberSpecializationInfo()) { 1275 if (MSInfo->getPointOfInstantiation().isInvalid()) { 1276 SourceLocation Loc = R->getLocation(); // FIXME 1277 MSInfo->setPointOfInstantiation(Loc); 1278 SemaRef.PendingLocalImplicitInstantiations.push_back( 1279 std::make_pair(Function, Loc)); 1280 queuedInstantiation = true; 1281 } 1282 } 1283 } 1284 break; 1285 default: 1286 if (const FunctionDecl *RPattern 1287 = R->getTemplateInstantiationPattern()) 1288 if (RPattern->isDefined(RPattern)) { 1289 SemaRef.Diag(Function->getLocation(), 1290 SemaRef.getLangOptions().CPlusPlus0x ? 1291 diag::warn_cxx98_compat_friend_redefinition : 1292 diag::err_redefinition) 1293 << Function->getDeclName(); 1294 SemaRef.Diag(R->getLocation(), diag::note_previous_definition); 1295 if (!SemaRef.getLangOptions().CPlusPlus0x) 1296 Function->setInvalidDecl(); 1297 break; 1298 } 1299 } 1300 } 1301 } 1302 } 1303 1304 if (Function->isOverloadedOperator() && !DC->isRecord() && 1305 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 1306 PrincipalDecl->setNonMemberOperator(); 1307 1308 assert(!D->isDefaulted() && "only methods should be defaulted"); 1309 return Function; 1310} 1311 1312Decl * 1313TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, 1314 TemplateParameterList *TemplateParams, 1315 bool IsClassScopeSpecialization) { 1316 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 1317 void *InsertPos = 0; 1318 if (FunctionTemplate && !TemplateParams) { 1319 // We are creating a function template specialization from a function 1320 // template. Check whether there is already a function template 1321 // specialization for this particular set of template arguments. 1322 std::pair<const TemplateArgument *, unsigned> Innermost 1323 = TemplateArgs.getInnermost(); 1324 1325 FunctionDecl *SpecFunc 1326 = FunctionTemplate->findSpecialization(Innermost.first, Innermost.second, 1327 InsertPos); 1328 1329 // If we already have a function template specialization, return it. 1330 if (SpecFunc) 1331 return SpecFunc; 1332 } 1333 1334 bool isFriend; 1335 if (FunctionTemplate) 1336 isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); 1337 else 1338 isFriend = (D->getFriendObjectKind() != Decl::FOK_None); 1339 1340 bool MergeWithParentScope = (TemplateParams != 0) || 1341 !(isa<Decl>(Owner) && 1342 cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod()); 1343 LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); 1344 1345 // Instantiate enclosing template arguments for friends. 1346 SmallVector<TemplateParameterList *, 4> TempParamLists; 1347 unsigned NumTempParamLists = 0; 1348 if (isFriend && (NumTempParamLists = D->getNumTemplateParameterLists())) { 1349 TempParamLists.set_size(NumTempParamLists); 1350 for (unsigned I = 0; I != NumTempParamLists; ++I) { 1351 TemplateParameterList *TempParams = D->getTemplateParameterList(I); 1352 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 1353 if (!InstParams) 1354 return NULL; 1355 TempParamLists[I] = InstParams; 1356 } 1357 } 1358 1359 SmallVector<ParmVarDecl *, 4> Params; 1360 TypeSourceInfo *TInfo = D->getTypeSourceInfo(); 1361 TInfo = SubstFunctionType(D, Params); 1362 if (!TInfo) 1363 return 0; 1364 QualType T = TInfo->getType(); 1365 1366 // \brief If the type of this function, after ignoring parentheses, 1367 // is not *directly* a function type, then we're instantiating a function 1368 // that was declared via a typedef, e.g., 1369 // 1370 // typedef int functype(int, int); 1371 // functype func; 1372 // 1373 // In this case, we'll just go instantiate the ParmVarDecls that we 1374 // synthesized in the method declaration. 1375 if (!isa<FunctionProtoType>(T.IgnoreParens())) { 1376 assert(!Params.size() && "Instantiating type could not yield parameters"); 1377 SmallVector<QualType, 4> ParamTypes; 1378 if (SemaRef.SubstParmTypes(D->getLocation(), D->param_begin(), 1379 D->getNumParams(), TemplateArgs, ParamTypes, 1380 &Params)) 1381 return 0; 1382 } 1383 1384 NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc(); 1385 if (QualifierLoc) { 1386 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, 1387 TemplateArgs); 1388 if (!QualifierLoc) 1389 return 0; 1390 } 1391 1392 DeclContext *DC = Owner; 1393 if (isFriend) { 1394 if (QualifierLoc) { 1395 CXXScopeSpec SS; 1396 SS.Adopt(QualifierLoc); 1397 DC = SemaRef.computeDeclContext(SS); 1398 1399 if (DC && SemaRef.RequireCompleteDeclContext(SS, DC)) 1400 return 0; 1401 } else { 1402 DC = SemaRef.FindInstantiatedContext(D->getLocation(), 1403 D->getDeclContext(), 1404 TemplateArgs); 1405 } 1406 if (!DC) return 0; 1407 } 1408 1409 // Build the instantiated method declaration. 1410 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1411 CXXMethodDecl *Method = 0; 1412 1413 SourceLocation StartLoc = D->getInnerLocStart(); 1414 DeclarationNameInfo NameInfo 1415 = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs); 1416 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 1417 Method = CXXConstructorDecl::Create(SemaRef.Context, Record, 1418 StartLoc, NameInfo, T, TInfo, 1419 Constructor->isExplicit(), 1420 Constructor->isInlineSpecified(), 1421 false, /*isConstexpr*/ false); 1422 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 1423 Method = CXXDestructorDecl::Create(SemaRef.Context, Record, 1424 StartLoc, NameInfo, T, TInfo, 1425 Destructor->isInlineSpecified(), 1426 false); 1427 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) { 1428 Method = CXXConversionDecl::Create(SemaRef.Context, Record, 1429 StartLoc, NameInfo, T, TInfo, 1430 Conversion->isInlineSpecified(), 1431 Conversion->isExplicit(), 1432 /*isConstexpr*/ false, 1433 Conversion->getLocEnd()); 1434 } else { 1435 Method = CXXMethodDecl::Create(SemaRef.Context, Record, 1436 StartLoc, NameInfo, T, TInfo, 1437 D->isStatic(), 1438 D->getStorageClassAsWritten(), 1439 D->isInlineSpecified(), 1440 /*isConstexpr*/ false, D->getLocEnd()); 1441 } 1442 1443 if (QualifierLoc) 1444 Method->setQualifierInfo(QualifierLoc); 1445 1446 if (TemplateParams) { 1447 // Our resulting instantiation is actually a function template, since we 1448 // are substituting only the outer template parameters. For example, given 1449 // 1450 // template<typename T> 1451 // struct X { 1452 // template<typename U> void f(T, U); 1453 // }; 1454 // 1455 // X<int> x; 1456 // 1457 // We are instantiating the member template "f" within X<int>, which means 1458 // substituting int for T, but leaving "f" as a member function template. 1459 // Build the function template itself. 1460 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, 1461 Method->getLocation(), 1462 Method->getDeclName(), 1463 TemplateParams, Method); 1464 if (isFriend) { 1465 FunctionTemplate->setLexicalDeclContext(Owner); 1466 FunctionTemplate->setObjectOfFriendDecl(true); 1467 } else if (D->isOutOfLine()) 1468 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 1469 Method->setDescribedFunctionTemplate(FunctionTemplate); 1470 } else if (FunctionTemplate) { 1471 // Record this function template specialization. 1472 std::pair<const TemplateArgument *, unsigned> Innermost 1473 = TemplateArgs.getInnermost(); 1474 Method->setFunctionTemplateSpecialization(FunctionTemplate, 1475 TemplateArgumentList::CreateCopy(SemaRef.Context, 1476 Innermost.first, 1477 Innermost.second), 1478 InsertPos); 1479 } else if (!isFriend) { 1480 // Record that this is an instantiation of a member function. 1481 Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 1482 } 1483 1484 // If we are instantiating a member function defined 1485 // out-of-line, the instantiation will have the same lexical 1486 // context (which will be a namespace scope) as the template. 1487 if (isFriend) { 1488 if (NumTempParamLists) 1489 Method->setTemplateParameterListsInfo(SemaRef.Context, 1490 NumTempParamLists, 1491 TempParamLists.data()); 1492 1493 Method->setLexicalDeclContext(Owner); 1494 Method->setObjectOfFriendDecl(true); 1495 } else if (D->isOutOfLine()) 1496 Method->setLexicalDeclContext(D->getLexicalDeclContext()); 1497 1498 // Attach the parameters 1499 for (unsigned P = 0; P < Params.size(); ++P) 1500 Params[P]->setOwningFunction(Method); 1501 Method->setParams(Params); 1502 1503 if (InitMethodInstantiation(Method, D)) 1504 Method->setInvalidDecl(); 1505 1506 LookupResult Previous(SemaRef, NameInfo, Sema::LookupOrdinaryName, 1507 Sema::ForRedeclaration); 1508 1509 if (!FunctionTemplate || TemplateParams || isFriend) { 1510 SemaRef.LookupQualifiedName(Previous, Record); 1511 1512 // In C++, the previous declaration we find might be a tag type 1513 // (class or enum). In this case, the new declaration will hide the 1514 // tag type. Note that this does does not apply if we're declaring a 1515 // typedef (C++ [dcl.typedef]p4). 1516 if (Previous.isSingleTagDecl()) 1517 Previous.clear(); 1518 } 1519 1520 if (!IsClassScopeSpecialization) 1521 SemaRef.CheckFunctionDeclaration(0, Method, Previous, false); 1522 1523 if (D->isPure()) 1524 SemaRef.CheckPureMethod(Method, SourceRange()); 1525 1526 Method->setAccess(D->getAccess()); 1527 1528 SemaRef.CheckOverrideControl(Method); 1529 1530 if (FunctionTemplate) { 1531 // If there's a function template, let our caller handle it. 1532 } else if (Method->isInvalidDecl() && !Previous.empty()) { 1533 // Don't hide a (potentially) valid declaration with an invalid one. 1534 } else { 1535 NamedDecl *DeclToAdd = (TemplateParams 1536 ? cast<NamedDecl>(FunctionTemplate) 1537 : Method); 1538 if (isFriend) 1539 Record->makeDeclVisibleInContext(DeclToAdd); 1540 else if (!IsClassScopeSpecialization) 1541 Owner->addDecl(DeclToAdd); 1542 } 1543 1544 if (D->isExplicitlyDefaulted()) { 1545 SemaRef.SetDeclDefaulted(Method, Method->getLocation()); 1546 } else { 1547 assert(!D->isDefaulted() && 1548 "should not implicitly default uninstantiated function"); 1549 } 1550 1551 return Method; 1552} 1553 1554Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { 1555 return VisitCXXMethodDecl(D); 1556} 1557 1558Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { 1559 return VisitCXXMethodDecl(D); 1560} 1561 1562Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { 1563 return VisitCXXMethodDecl(D); 1564} 1565 1566ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { 1567 return SemaRef.SubstParmVarDecl(D, TemplateArgs, /*indexAdjustment*/ 0, 1568 llvm::Optional<unsigned>()); 1569} 1570 1571Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( 1572 TemplateTypeParmDecl *D) { 1573 // TODO: don't always clone when decls are refcounted. 1574 assert(D->getTypeForDecl()->isTemplateTypeParmType()); 1575 1576 TemplateTypeParmDecl *Inst = 1577 TemplateTypeParmDecl::Create(SemaRef.Context, Owner, 1578 D->getLocStart(), D->getLocation(), 1579 D->getDepth() - TemplateArgs.getNumLevels(), 1580 D->getIndex(), D->getIdentifier(), 1581 D->wasDeclaredWithTypename(), 1582 D->isParameterPack()); 1583 Inst->setAccess(AS_public); 1584 1585 if (D->hasDefaultArgument()) 1586 Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); 1587 1588 // Introduce this template parameter's instantiation into the instantiation 1589 // scope. 1590 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst); 1591 1592 return Inst; 1593} 1594 1595Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( 1596 NonTypeTemplateParmDecl *D) { 1597 // Substitute into the type of the non-type template parameter. 1598 TypeLoc TL = D->getTypeSourceInfo()->getTypeLoc(); 1599 SmallVector<TypeSourceInfo *, 4> ExpandedParameterPackTypesAsWritten; 1600 SmallVector<QualType, 4> ExpandedParameterPackTypes; 1601 bool IsExpandedParameterPack = false; 1602 TypeSourceInfo *DI; 1603 QualType T; 1604 bool Invalid = false; 1605 1606 if (D->isExpandedParameterPack()) { 1607 // The non-type template parameter pack is an already-expanded pack 1608 // expansion of types. Substitute into each of the expanded types. 1609 ExpandedParameterPackTypes.reserve(D->getNumExpansionTypes()); 1610 ExpandedParameterPackTypesAsWritten.reserve(D->getNumExpansionTypes()); 1611 for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) { 1612 TypeSourceInfo *NewDI =SemaRef.SubstType(D->getExpansionTypeSourceInfo(I), 1613 TemplateArgs, 1614 D->getLocation(), 1615 D->getDeclName()); 1616 if (!NewDI) 1617 return 0; 1618 1619 ExpandedParameterPackTypesAsWritten.push_back(NewDI); 1620 QualType NewT =SemaRef.CheckNonTypeTemplateParameterType(NewDI->getType(), 1621 D->getLocation()); 1622 if (NewT.isNull()) 1623 return 0; 1624 ExpandedParameterPackTypes.push_back(NewT); 1625 } 1626 1627 IsExpandedParameterPack = true; 1628 DI = D->getTypeSourceInfo(); 1629 T = DI->getType(); 1630 } else if (isa<PackExpansionTypeLoc>(TL)) { 1631 // The non-type template parameter pack's type is a pack expansion of types. 1632 // Determine whether we need to expand this parameter pack into separate 1633 // types. 1634 PackExpansionTypeLoc Expansion = cast<PackExpansionTypeLoc>(TL); 1635 TypeLoc Pattern = Expansion.getPatternLoc(); 1636 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 1637 SemaRef.collectUnexpandedParameterPacks(Pattern, Unexpanded); 1638 1639 // Determine whether the set of unexpanded parameter packs can and should 1640 // be expanded. 1641 bool Expand = true; 1642 bool RetainExpansion = false; 1643 llvm::Optional<unsigned> OrigNumExpansions 1644 = Expansion.getTypePtr()->getNumExpansions(); 1645 llvm::Optional<unsigned> NumExpansions = OrigNumExpansions; 1646 if (SemaRef.CheckParameterPacksForExpansion(Expansion.getEllipsisLoc(), 1647 Pattern.getSourceRange(), 1648 Unexpanded, 1649 TemplateArgs, 1650 Expand, RetainExpansion, 1651 NumExpansions)) 1652 return 0; 1653 1654 if (Expand) { 1655 for (unsigned I = 0; I != *NumExpansions; ++I) { 1656 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I); 1657 TypeSourceInfo *NewDI = SemaRef.SubstType(Pattern, TemplateArgs, 1658 D->getLocation(), 1659 D->getDeclName()); 1660 if (!NewDI) 1661 return 0; 1662 1663 ExpandedParameterPackTypesAsWritten.push_back(NewDI); 1664 QualType NewT = SemaRef.CheckNonTypeTemplateParameterType( 1665 NewDI->getType(), 1666 D->getLocation()); 1667 if (NewT.isNull()) 1668 return 0; 1669 ExpandedParameterPackTypes.push_back(NewT); 1670 } 1671 1672 // Note that we have an expanded parameter pack. The "type" of this 1673 // expanded parameter pack is the original expansion type, but callers 1674 // will end up using the expanded parameter pack types for type-checking. 1675 IsExpandedParameterPack = true; 1676 DI = D->getTypeSourceInfo(); 1677 T = DI->getType(); 1678 } else { 1679 // We cannot fully expand the pack expansion now, so substitute into the 1680 // pattern and create a new pack expansion type. 1681 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1); 1682 TypeSourceInfo *NewPattern = SemaRef.SubstType(Pattern, TemplateArgs, 1683 D->getLocation(), 1684 D->getDeclName()); 1685 if (!NewPattern) 1686 return 0; 1687 1688 DI = SemaRef.CheckPackExpansion(NewPattern, Expansion.getEllipsisLoc(), 1689 NumExpansions); 1690 if (!DI) 1691 return 0; 1692 1693 T = DI->getType(); 1694 } 1695 } else { 1696 // Simple case: substitution into a parameter that is not a parameter pack. 1697 DI = SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs, 1698 D->getLocation(), D->getDeclName()); 1699 if (!DI) 1700 return 0; 1701 1702 // Check that this type is acceptable for a non-type template parameter. 1703 T = SemaRef.CheckNonTypeTemplateParameterType(DI->getType(), 1704 D->getLocation()); 1705 if (T.isNull()) { 1706 T = SemaRef.Context.IntTy; 1707 Invalid = true; 1708 } 1709 } 1710 1711 NonTypeTemplateParmDecl *Param; 1712 if (IsExpandedParameterPack) 1713 Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, 1714 D->getInnerLocStart(), 1715 D->getLocation(), 1716 D->getDepth() - TemplateArgs.getNumLevels(), 1717 D->getPosition(), 1718 D->getIdentifier(), T, 1719 DI, 1720 ExpandedParameterPackTypes.data(), 1721 ExpandedParameterPackTypes.size(), 1722 ExpandedParameterPackTypesAsWritten.data()); 1723 else 1724 Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, 1725 D->getInnerLocStart(), 1726 D->getLocation(), 1727 D->getDepth() - TemplateArgs.getNumLevels(), 1728 D->getPosition(), 1729 D->getIdentifier(), T, 1730 D->isParameterPack(), DI); 1731 1732 Param->setAccess(AS_public); 1733 if (Invalid) 1734 Param->setInvalidDecl(); 1735 1736 Param->setDefaultArgument(D->getDefaultArgument(), false); 1737 1738 // Introduce this template parameter's instantiation into the instantiation 1739 // scope. 1740 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 1741 return Param; 1742} 1743 1744Decl * 1745TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( 1746 TemplateTemplateParmDecl *D) { 1747 // Instantiate the template parameter list of the template template parameter. 1748 TemplateParameterList *TempParams = D->getTemplateParameters(); 1749 TemplateParameterList *InstParams; 1750 { 1751 // Perform the actual substitution of template parameters within a new, 1752 // local instantiation scope. 1753 LocalInstantiationScope Scope(SemaRef); 1754 InstParams = SubstTemplateParams(TempParams); 1755 if (!InstParams) 1756 return NULL; 1757 } 1758 1759 // Build the template template parameter. 1760 TemplateTemplateParmDecl *Param 1761 = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1762 D->getDepth() - TemplateArgs.getNumLevels(), 1763 D->getPosition(), D->isParameterPack(), 1764 D->getIdentifier(), InstParams); 1765 Param->setDefaultArgument(D->getDefaultArgument(), false); 1766 Param->setAccess(AS_public); 1767 1768 // Introduce this template parameter's instantiation into the instantiation 1769 // scope. 1770 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 1771 1772 return Param; 1773} 1774 1775Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) { 1776 // Using directives are never dependent (and never contain any types or 1777 // expressions), so they require no explicit instantiation work. 1778 1779 UsingDirectiveDecl *Inst 1780 = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1781 D->getNamespaceKeyLocation(), 1782 D->getQualifierLoc(), 1783 D->getIdentLocation(), 1784 D->getNominatedNamespace(), 1785 D->getCommonAncestor()); 1786 Owner->addDecl(Inst); 1787 return Inst; 1788} 1789 1790Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { 1791 1792 // The nested name specifier may be dependent, for example 1793 // template <typename T> struct t { 1794 // struct s1 { T f1(); }; 1795 // struct s2 : s1 { using s1::f1; }; 1796 // }; 1797 // template struct t<int>; 1798 // Here, in using s1::f1, s1 refers to t<T>::s1; 1799 // we need to substitute for t<int>::s1. 1800 NestedNameSpecifierLoc QualifierLoc 1801 = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), 1802 TemplateArgs); 1803 if (!QualifierLoc) 1804 return 0; 1805 1806 // The name info is non-dependent, so no transformation 1807 // is required. 1808 DeclarationNameInfo NameInfo = D->getNameInfo(); 1809 1810 // We only need to do redeclaration lookups if we're in a class 1811 // scope (in fact, it's not really even possible in non-class 1812 // scopes). 1813 bool CheckRedeclaration = Owner->isRecord(); 1814 1815 LookupResult Prev(SemaRef, NameInfo, Sema::LookupUsingDeclName, 1816 Sema::ForRedeclaration); 1817 1818 UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner, 1819 D->getUsingLocation(), 1820 QualifierLoc, 1821 NameInfo, 1822 D->isTypeName()); 1823 1824 CXXScopeSpec SS; 1825 SS.Adopt(QualifierLoc); 1826 if (CheckRedeclaration) { 1827 Prev.setHideTags(false); 1828 SemaRef.LookupQualifiedName(Prev, Owner); 1829 1830 // Check for invalid redeclarations. 1831 if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(), 1832 D->isTypeName(), SS, 1833 D->getLocation(), Prev)) 1834 NewUD->setInvalidDecl(); 1835 1836 } 1837 1838 if (!NewUD->isInvalidDecl() && 1839 SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS, 1840 D->getLocation())) 1841 NewUD->setInvalidDecl(); 1842 1843 SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D); 1844 NewUD->setAccess(D->getAccess()); 1845 Owner->addDecl(NewUD); 1846 1847 // Don't process the shadow decls for an invalid decl. 1848 if (NewUD->isInvalidDecl()) 1849 return NewUD; 1850 1851 bool isFunctionScope = Owner->isFunctionOrMethod(); 1852 1853 // Process the shadow decls. 1854 for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end(); 1855 I != E; ++I) { 1856 UsingShadowDecl *Shadow = *I; 1857 NamedDecl *InstTarget = 1858 cast_or_null<NamedDecl>(SemaRef.FindInstantiatedDecl( 1859 Shadow->getLocation(), 1860 Shadow->getTargetDecl(), 1861 TemplateArgs)); 1862 if (!InstTarget) 1863 return 0; 1864 1865 if (CheckRedeclaration && 1866 SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev)) 1867 continue; 1868 1869 UsingShadowDecl *InstShadow 1870 = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget); 1871 SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow); 1872 1873 if (isFunctionScope) 1874 SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow); 1875 } 1876 1877 return NewUD; 1878} 1879 1880Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) { 1881 // Ignore these; we handle them in bulk when processing the UsingDecl. 1882 return 0; 1883} 1884 1885Decl * TemplateDeclInstantiator 1886 ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) { 1887 NestedNameSpecifierLoc QualifierLoc 1888 = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), 1889 TemplateArgs); 1890 if (!QualifierLoc) 1891 return 0; 1892 1893 CXXScopeSpec SS; 1894 SS.Adopt(QualifierLoc); 1895 1896 // Since NameInfo refers to a typename, it cannot be a C++ special name. 1897 // Hence, no tranformation is required for it. 1898 DeclarationNameInfo NameInfo(D->getDeclName(), D->getLocation()); 1899 NamedDecl *UD = 1900 SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), 1901 D->getUsingLoc(), SS, NameInfo, 0, 1902 /*instantiation*/ true, 1903 /*typename*/ true, D->getTypenameLoc()); 1904 if (UD) 1905 SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D); 1906 1907 return UD; 1908} 1909 1910Decl * TemplateDeclInstantiator 1911 ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) { 1912 NestedNameSpecifierLoc QualifierLoc 1913 = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(), TemplateArgs); 1914 if (!QualifierLoc) 1915 return 0; 1916 1917 CXXScopeSpec SS; 1918 SS.Adopt(QualifierLoc); 1919 1920 DeclarationNameInfo NameInfo 1921 = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs); 1922 1923 NamedDecl *UD = 1924 SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), 1925 D->getUsingLoc(), SS, NameInfo, 0, 1926 /*instantiation*/ true, 1927 /*typename*/ false, SourceLocation()); 1928 if (UD) 1929 SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D); 1930 1931 return UD; 1932} 1933 1934 1935Decl *TemplateDeclInstantiator::VisitClassScopeFunctionSpecializationDecl( 1936 ClassScopeFunctionSpecializationDecl *Decl) { 1937 CXXMethodDecl *OldFD = Decl->getSpecialization(); 1938 CXXMethodDecl *NewFD = cast<CXXMethodDecl>(VisitCXXMethodDecl(OldFD, 0, true)); 1939 1940 LookupResult Previous(SemaRef, NewFD->getNameInfo(), Sema::LookupOrdinaryName, 1941 Sema::ForRedeclaration); 1942 1943 SemaRef.LookupQualifiedName(Previous, SemaRef.CurContext); 1944 if (SemaRef.CheckFunctionTemplateSpecialization(NewFD, 0, Previous)) { 1945 NewFD->setInvalidDecl(); 1946 return NewFD; 1947 } 1948 1949 // Associate the specialization with the pattern. 1950 FunctionDecl *Specialization = cast<FunctionDecl>(Previous.getFoundDecl()); 1951 assert(Specialization && "Class scope Specialization is null"); 1952 SemaRef.Context.setClassScopeSpecializationPattern(Specialization, OldFD); 1953 1954 return NewFD; 1955} 1956 1957Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, 1958 const MultiLevelTemplateArgumentList &TemplateArgs) { 1959 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); 1960 if (D->isInvalidDecl()) 1961 return 0; 1962 1963 return Instantiator.Visit(D); 1964} 1965 1966/// \brief Instantiates a nested template parameter list in the current 1967/// instantiation context. 1968/// 1969/// \param L The parameter list to instantiate 1970/// 1971/// \returns NULL if there was an error 1972TemplateParameterList * 1973TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { 1974 // Get errors for all the parameters before bailing out. 1975 bool Invalid = false; 1976 1977 unsigned N = L->size(); 1978 typedef SmallVector<NamedDecl *, 8> ParamVector; 1979 ParamVector Params; 1980 Params.reserve(N); 1981 for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); 1982 PI != PE; ++PI) { 1983 NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); 1984 Params.push_back(D); 1985 Invalid = Invalid || !D || D->isInvalidDecl(); 1986 } 1987 1988 // Clean up if we had an error. 1989 if (Invalid) 1990 return NULL; 1991 1992 TemplateParameterList *InstL 1993 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), 1994 L->getLAngleLoc(), &Params.front(), N, 1995 L->getRAngleLoc()); 1996 return InstL; 1997} 1998 1999/// \brief Instantiate the declaration of a class template partial 2000/// specialization. 2001/// 2002/// \param ClassTemplate the (instantiated) class template that is partially 2003// specialized by the instantiation of \p PartialSpec. 2004/// 2005/// \param PartialSpec the (uninstantiated) class template partial 2006/// specialization that we are instantiating. 2007/// 2008/// \returns The instantiated partial specialization, if successful; otherwise, 2009/// NULL to indicate an error. 2010ClassTemplatePartialSpecializationDecl * 2011TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( 2012 ClassTemplateDecl *ClassTemplate, 2013 ClassTemplatePartialSpecializationDecl *PartialSpec) { 2014 // Create a local instantiation scope for this class template partial 2015 // specialization, which will contain the instantiations of the template 2016 // parameters. 2017 LocalInstantiationScope Scope(SemaRef); 2018 2019 // Substitute into the template parameters of the class template partial 2020 // specialization. 2021 TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); 2022 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 2023 if (!InstParams) 2024 return 0; 2025 2026 // Substitute into the template arguments of the class template partial 2027 // specialization. 2028 TemplateArgumentListInfo InstTemplateArgs; // no angle locations 2029 if (SemaRef.Subst(PartialSpec->getTemplateArgsAsWritten(), 2030 PartialSpec->getNumTemplateArgsAsWritten(), 2031 InstTemplateArgs, TemplateArgs)) 2032 return 0; 2033 2034 // Check that the template argument list is well-formed for this 2035 // class template. 2036 SmallVector<TemplateArgument, 4> Converted; 2037 if (SemaRef.CheckTemplateArgumentList(ClassTemplate, 2038 PartialSpec->getLocation(), 2039 InstTemplateArgs, 2040 false, 2041 Converted)) 2042 return 0; 2043 2044 // Figure out where to insert this class template partial specialization 2045 // in the member template's set of class template partial specializations. 2046 void *InsertPos = 0; 2047 ClassTemplateSpecializationDecl *PrevDecl 2048 = ClassTemplate->findPartialSpecialization(Converted.data(), 2049 Converted.size(), InsertPos); 2050 2051 // Build the canonical type that describes the converted template 2052 // arguments of the class template partial specialization. 2053 QualType CanonType 2054 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), 2055 Converted.data(), 2056 Converted.size()); 2057 2058 // Build the fully-sugared type for this class template 2059 // specialization as the user wrote in the specialization 2060 // itself. This means that we'll pretty-print the type retrieved 2061 // from the specialization's declaration the way that the user 2062 // actually wrote the specialization, rather than formatting the 2063 // name based on the "canonical" representation used to store the 2064 // template arguments in the specialization. 2065 TypeSourceInfo *WrittenTy 2066 = SemaRef.Context.getTemplateSpecializationTypeInfo( 2067 TemplateName(ClassTemplate), 2068 PartialSpec->getLocation(), 2069 InstTemplateArgs, 2070 CanonType); 2071 2072 if (PrevDecl) { 2073 // We've already seen a partial specialization with the same template 2074 // parameters and template arguments. This can happen, for example, when 2075 // substituting the outer template arguments ends up causing two 2076 // class template partial specializations of a member class template 2077 // to have identical forms, e.g., 2078 // 2079 // template<typename T, typename U> 2080 // struct Outer { 2081 // template<typename X, typename Y> struct Inner; 2082 // template<typename Y> struct Inner<T, Y>; 2083 // template<typename Y> struct Inner<U, Y>; 2084 // }; 2085 // 2086 // Outer<int, int> outer; // error: the partial specializations of Inner 2087 // // have the same signature. 2088 SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared) 2089 << WrittenTy->getType(); 2090 SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here) 2091 << SemaRef.Context.getTypeDeclType(PrevDecl); 2092 return 0; 2093 } 2094 2095 2096 // Create the class template partial specialization declaration. 2097 ClassTemplatePartialSpecializationDecl *InstPartialSpec 2098 = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, 2099 PartialSpec->getTagKind(), 2100 Owner, 2101 PartialSpec->getLocStart(), 2102 PartialSpec->getLocation(), 2103 InstParams, 2104 ClassTemplate, 2105 Converted.data(), 2106 Converted.size(), 2107 InstTemplateArgs, 2108 CanonType, 2109 0, 2110 ClassTemplate->getNextPartialSpecSequenceNumber()); 2111 // Substitute the nested name specifier, if any. 2112 if (SubstQualifier(PartialSpec, InstPartialSpec)) 2113 return 0; 2114 2115 InstPartialSpec->setInstantiatedFromMember(PartialSpec); 2116 InstPartialSpec->setTypeAsWritten(WrittenTy); 2117 2118 // Add this partial specialization to the set of class template partial 2119 // specializations. 2120 ClassTemplate->AddPartialSpecialization(InstPartialSpec, InsertPos); 2121 return InstPartialSpec; 2122} 2123 2124TypeSourceInfo* 2125TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, 2126 SmallVectorImpl<ParmVarDecl *> &Params) { 2127 TypeSourceInfo *OldTInfo = D->getTypeSourceInfo(); 2128 assert(OldTInfo && "substituting function without type source info"); 2129 assert(Params.empty() && "parameter vector is non-empty at start"); 2130 TypeSourceInfo *NewTInfo 2131 = SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs, 2132 D->getTypeSpecStartLoc(), 2133 D->getDeclName()); 2134 if (!NewTInfo) 2135 return 0; 2136 2137 if (NewTInfo != OldTInfo) { 2138 // Get parameters from the new type info. 2139 TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens(); 2140 if (FunctionProtoTypeLoc *OldProtoLoc 2141 = dyn_cast<FunctionProtoTypeLoc>(&OldTL)) { 2142 TypeLoc NewTL = NewTInfo->getTypeLoc().IgnoreParens(); 2143 FunctionProtoTypeLoc *NewProtoLoc = cast<FunctionProtoTypeLoc>(&NewTL); 2144 assert(NewProtoLoc && "Missing prototype?"); 2145 unsigned NewIdx = 0, NumNewParams = NewProtoLoc->getNumArgs(); 2146 for (unsigned OldIdx = 0, NumOldParams = OldProtoLoc->getNumArgs(); 2147 OldIdx != NumOldParams; ++OldIdx) { 2148 ParmVarDecl *OldParam = OldProtoLoc->getArg(OldIdx); 2149 if (!OldParam->isParameterPack() || 2150 (NewIdx < NumNewParams && 2151 NewProtoLoc->getArg(NewIdx)->isParameterPack())) { 2152 // Simple case: normal parameter, or a parameter pack that's 2153 // instantiated to a (still-dependent) parameter pack. 2154 ParmVarDecl *NewParam = NewProtoLoc->getArg(NewIdx++); 2155 Params.push_back(NewParam); 2156 SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, 2157 NewParam); 2158 continue; 2159 } 2160 2161 // Parameter pack: make the instantiation an argument pack. 2162 SemaRef.CurrentInstantiationScope->MakeInstantiatedLocalArgPack( 2163 OldParam); 2164 unsigned NumArgumentsInExpansion 2165 = SemaRef.getNumArgumentsInExpansion(OldParam->getType(), 2166 TemplateArgs); 2167 while (NumArgumentsInExpansion--) { 2168 ParmVarDecl *NewParam = NewProtoLoc->getArg(NewIdx++); 2169 Params.push_back(NewParam); 2170 SemaRef.CurrentInstantiationScope->InstantiatedLocalPackArg(OldParam, 2171 NewParam); 2172 } 2173 } 2174 } 2175 } else { 2176 // The function type itself was not dependent and therefore no 2177 // substitution occurred. However, we still need to instantiate 2178 // the function parameters themselves. 2179 TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens(); 2180 if (FunctionProtoTypeLoc *OldProtoLoc 2181 = dyn_cast<FunctionProtoTypeLoc>(&OldTL)) { 2182 for (unsigned i = 0, i_end = OldProtoLoc->getNumArgs(); i != i_end; ++i) { 2183 ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc->getArg(i)); 2184 if (!Parm) 2185 return 0; 2186 Params.push_back(Parm); 2187 } 2188 } 2189 } 2190 return NewTInfo; 2191} 2192 2193/// \brief Initializes the common fields of an instantiation function 2194/// declaration (New) from the corresponding fields of its template (Tmpl). 2195/// 2196/// \returns true if there was an error 2197bool 2198TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, 2199 FunctionDecl *Tmpl) { 2200 if (Tmpl->isDeletedAsWritten()) 2201 New->setDeletedAsWritten(); 2202 2203 // If we are performing substituting explicitly-specified template arguments 2204 // or deduced template arguments into a function template and we reach this 2205 // point, we are now past the point where SFINAE applies and have committed 2206 // to keeping the new function template specialization. We therefore 2207 // convert the active template instantiation for the function template 2208 // into a template instantiation for this specific function template 2209 // specialization, which is not a SFINAE context, so that we diagnose any 2210 // further errors in the declaration itself. 2211 typedef Sema::ActiveTemplateInstantiation ActiveInstType; 2212 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); 2213 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || 2214 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { 2215 if (FunctionTemplateDecl *FunTmpl 2216 = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { 2217 assert(FunTmpl->getTemplatedDecl() == Tmpl && 2218 "Deduction from the wrong function template?"); 2219 (void) FunTmpl; 2220 ActiveInst.Kind = ActiveInstType::TemplateInstantiation; 2221 ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); 2222 --SemaRef.NonInstantiationEntries; 2223 } 2224 } 2225 2226 const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>(); 2227 assert(Proto && "Function template without prototype?"); 2228 2229 if (Proto->hasExceptionSpec() || Proto->getNoReturnAttr()) { 2230 // The function has an exception specification or a "noreturn" 2231 // attribute. Substitute into each of the exception types. 2232 SmallVector<QualType, 4> Exceptions; 2233 for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) { 2234 // FIXME: Poor location information! 2235 if (const PackExpansionType *PackExpansion 2236 = Proto->getExceptionType(I)->getAs<PackExpansionType>()) { 2237 // We have a pack expansion. Instantiate it. 2238 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 2239 SemaRef.collectUnexpandedParameterPacks(PackExpansion->getPattern(), 2240 Unexpanded); 2241 assert(!Unexpanded.empty() && 2242 "Pack expansion without parameter packs?"); 2243 2244 bool Expand = false; 2245 bool RetainExpansion = false; 2246 llvm::Optional<unsigned> NumExpansions 2247 = PackExpansion->getNumExpansions(); 2248 if (SemaRef.CheckParameterPacksForExpansion(New->getLocation(), 2249 SourceRange(), 2250 Unexpanded, 2251 TemplateArgs, 2252 Expand, 2253 RetainExpansion, 2254 NumExpansions)) 2255 break; 2256 2257 if (!Expand) { 2258 // We can't expand this pack expansion into separate arguments yet; 2259 // just substitute into the pattern and create a new pack expansion 2260 // type. 2261 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1); 2262 QualType T = SemaRef.SubstType(PackExpansion->getPattern(), 2263 TemplateArgs, 2264 New->getLocation(), New->getDeclName()); 2265 if (T.isNull()) 2266 break; 2267 2268 T = SemaRef.Context.getPackExpansionType(T, NumExpansions); 2269 Exceptions.push_back(T); 2270 continue; 2271 } 2272 2273 // Substitute into the pack expansion pattern for each template 2274 bool Invalid = false; 2275 for (unsigned ArgIdx = 0; ArgIdx != *NumExpansions; ++ArgIdx) { 2276 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, ArgIdx); 2277 2278 QualType T = SemaRef.SubstType(PackExpansion->getPattern(), 2279 TemplateArgs, 2280 New->getLocation(), New->getDeclName()); 2281 if (T.isNull()) { 2282 Invalid = true; 2283 break; 2284 } 2285 2286 Exceptions.push_back(T); 2287 } 2288 2289 if (Invalid) 2290 break; 2291 2292 continue; 2293 } 2294 2295 QualType T 2296 = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs, 2297 New->getLocation(), New->getDeclName()); 2298 if (T.isNull() || 2299 SemaRef.CheckSpecifiedExceptionType(T, New->getLocation())) 2300 continue; 2301 2302 Exceptions.push_back(T); 2303 } 2304 Expr *NoexceptExpr = 0; 2305 if (Expr *OldNoexceptExpr = Proto->getNoexceptExpr()) { 2306 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated); 2307 ExprResult E = SemaRef.SubstExpr(OldNoexceptExpr, TemplateArgs); 2308 if (E.isUsable()) 2309 E = SemaRef.CheckBooleanCondition(E.get(), E.get()->getLocStart()); 2310 2311 if (E.isUsable()) { 2312 SourceLocation ErrLoc; 2313 llvm::APSInt NoexceptVal; 2314 NoexceptExpr = E.take(); 2315 if (!NoexceptExpr->isTypeDependent() && 2316 !NoexceptExpr->isValueDependent() && 2317 !NoexceptExpr->isIntegerConstantExpr(NoexceptVal, SemaRef.Context, 2318 &ErrLoc, /*evaluated=*/false)){ 2319 SemaRef.Diag(ErrLoc, diag::err_noexcept_needs_constant_expression) 2320 << NoexceptExpr->getSourceRange(); 2321 NoexceptExpr = 0; 2322 } 2323 } 2324 } 2325 2326 // Rebuild the function type 2327 2328 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 2329 EPI.ExceptionSpecType = Proto->getExceptionSpecType(); 2330 EPI.NumExceptions = Exceptions.size(); 2331 EPI.Exceptions = Exceptions.data(); 2332 EPI.NoexceptExpr = NoexceptExpr; 2333 EPI.ExtInfo = Proto->getExtInfo(); 2334 2335 const FunctionProtoType *NewProto 2336 = New->getType()->getAs<FunctionProtoType>(); 2337 assert(NewProto && "Template instantiation without function prototype?"); 2338 New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), 2339 NewProto->arg_type_begin(), 2340 NewProto->getNumArgs(), 2341 EPI)); 2342 } 2343 2344 // C++0x [dcl.constexpr]p6: If the instantiated template specialization of 2345 // a constexpr function template satisfies the requirements for a constexpr 2346 // function, then it is a constexpr function. 2347 if (Tmpl->isConstexpr() && 2348 SemaRef.CheckConstexprFunctionDecl(New, Sema::CCK_Instantiation)) 2349 New->setConstexpr(true); 2350 2351 const FunctionDecl* Definition = Tmpl; 2352 2353 // Get the definition. Leaves the variable unchanged if undefined. 2354 Tmpl->isDefined(Definition); 2355 2356 SemaRef.InstantiateAttrs(TemplateArgs, Definition, New); 2357 2358 return false; 2359} 2360 2361/// \brief Initializes common fields of an instantiated method 2362/// declaration (New) from the corresponding fields of its template 2363/// (Tmpl). 2364/// 2365/// \returns true if there was an error 2366bool 2367TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, 2368 CXXMethodDecl *Tmpl) { 2369 if (InitFunctionInstantiation(New, Tmpl)) 2370 return true; 2371 2372 New->setAccess(Tmpl->getAccess()); 2373 if (Tmpl->isVirtualAsWritten()) 2374 New->setVirtualAsWritten(true); 2375 2376 // FIXME: attributes 2377 // FIXME: New needs a pointer to Tmpl 2378 return false; 2379} 2380 2381/// \brief Instantiate the definition of the given function from its 2382/// template. 2383/// 2384/// \param PointOfInstantiation the point at which the instantiation was 2385/// required. Note that this is not precisely a "point of instantiation" 2386/// for the function, but it's close. 2387/// 2388/// \param Function the already-instantiated declaration of a 2389/// function template specialization or member function of a class template 2390/// specialization. 2391/// 2392/// \param Recursive if true, recursively instantiates any functions that 2393/// are required by this instantiation. 2394/// 2395/// \param DefinitionRequired if true, then we are performing an explicit 2396/// instantiation where the body of the function is required. Complain if 2397/// there is no such body. 2398void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, 2399 FunctionDecl *Function, 2400 bool Recursive, 2401 bool DefinitionRequired) { 2402 if (Function->isInvalidDecl() || Function->isDefined()) 2403 return; 2404 2405 // Never instantiate an explicit specialization except if it is a class scope 2406 // explicit specialization. 2407 if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization && 2408 !Function->getClassScopeSpecializationPattern()) 2409 return; 2410 2411 // Find the function body that we'll be substituting. 2412 const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern(); 2413 assert(PatternDecl && "instantiating a non-template"); 2414 2415 Stmt *Pattern = PatternDecl->getBody(PatternDecl); 2416 assert(PatternDecl && "template definition is not a template"); 2417 if (!Pattern) { 2418 // Try to find a defaulted definition 2419 PatternDecl->isDefined(PatternDecl); 2420 } 2421 assert(PatternDecl && "template definition is not a template"); 2422 2423 // Postpone late parsed template instantiations. 2424 if (PatternDecl->isLateTemplateParsed() && 2425 !LateTemplateParser) { 2426 PendingInstantiations.push_back( 2427 std::make_pair(Function, PointOfInstantiation)); 2428 return; 2429 } 2430 2431 // Call the LateTemplateParser callback if there a need to late parse 2432 // a templated function definition. 2433 if (!Pattern && PatternDecl->isLateTemplateParsed() && 2434 LateTemplateParser) { 2435 LateTemplateParser(OpaqueParser, PatternDecl); 2436 Pattern = PatternDecl->getBody(PatternDecl); 2437 } 2438 2439 if (!Pattern && !PatternDecl->isDefaulted()) { 2440 if (DefinitionRequired) { 2441 if (Function->getPrimaryTemplate()) 2442 Diag(PointOfInstantiation, 2443 diag::err_explicit_instantiation_undefined_func_template) 2444 << Function->getPrimaryTemplate(); 2445 else 2446 Diag(PointOfInstantiation, 2447 diag::err_explicit_instantiation_undefined_member) 2448 << 1 << Function->getDeclName() << Function->getDeclContext(); 2449 2450 if (PatternDecl) 2451 Diag(PatternDecl->getLocation(), 2452 diag::note_explicit_instantiation_here); 2453 Function->setInvalidDecl(); 2454 } else if (Function->getTemplateSpecializationKind() 2455 == TSK_ExplicitInstantiationDefinition) { 2456 PendingInstantiations.push_back( 2457 std::make_pair(Function, PointOfInstantiation)); 2458 } 2459 2460 return; 2461 } 2462 2463 // C++0x [temp.explicit]p9: 2464 // Except for inline functions, other explicit instantiation declarations 2465 // have the effect of suppressing the implicit instantiation of the entity 2466 // to which they refer. 2467 if (Function->getTemplateSpecializationKind() 2468 == TSK_ExplicitInstantiationDeclaration && 2469 !PatternDecl->isInlined()) 2470 return; 2471 2472 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); 2473 if (Inst) 2474 return; 2475 2476 // If we're performing recursive template instantiation, create our own 2477 // queue of pending implicit instantiations that we will instantiate later, 2478 // while we're still within our own instantiation context. 2479 SmallVector<VTableUse, 16> SavedVTableUses; 2480 std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; 2481 if (Recursive) { 2482 VTableUses.swap(SavedVTableUses); 2483 PendingInstantiations.swap(SavedPendingInstantiations); 2484 } 2485 2486 EnterExpressionEvaluationContext EvalContext(*this, 2487 Sema::PotentiallyEvaluated); 2488 ActOnStartOfFunctionDef(0, Function); 2489 2490 // Introduce a new scope where local variable instantiations will be 2491 // recorded, unless we're actually a member function within a local 2492 // class, in which case we need to merge our results with the parent 2493 // scope (of the enclosing function). 2494 bool MergeWithParentScope = false; 2495 if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext())) 2496 MergeWithParentScope = Rec->isLocalClass(); 2497 2498 LocalInstantiationScope Scope(*this, MergeWithParentScope); 2499 2500 // Introduce the instantiated function parameters into the local 2501 // instantiation scope, and set the parameter names to those used 2502 // in the template. 2503 unsigned FParamIdx = 0; 2504 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) { 2505 const ParmVarDecl *PatternParam = PatternDecl->getParamDecl(I); 2506 if (!PatternParam->isParameterPack()) { 2507 // Simple case: not a parameter pack. 2508 assert(FParamIdx < Function->getNumParams()); 2509 ParmVarDecl *FunctionParam = Function->getParamDecl(I); 2510 FunctionParam->setDeclName(PatternParam->getDeclName()); 2511 Scope.InstantiatedLocal(PatternParam, FunctionParam); 2512 ++FParamIdx; 2513 continue; 2514 } 2515 2516 // Expand the parameter pack. 2517 Scope.MakeInstantiatedLocalArgPack(PatternParam); 2518 for (unsigned NumFParams = Function->getNumParams(); 2519 FParamIdx < NumFParams; 2520 ++FParamIdx) { 2521 ParmVarDecl *FunctionParam = Function->getParamDecl(FParamIdx); 2522 FunctionParam->setDeclName(PatternParam->getDeclName()); 2523 Scope.InstantiatedLocalPackArg(PatternParam, FunctionParam); 2524 } 2525 } 2526 2527 // Enter the scope of this instantiation. We don't use 2528 // PushDeclContext because we don't have a scope. 2529 Sema::ContextRAII savedContext(*this, Function); 2530 2531 MultiLevelTemplateArgumentList TemplateArgs = 2532 getTemplateInstantiationArgs(Function, 0, false, PatternDecl); 2533 2534 if (PatternDecl->isDefaulted()) { 2535 ActOnFinishFunctionBody(Function, 0, /*IsInstantiation=*/true); 2536 2537 SetDeclDefaulted(Function, PatternDecl->getLocation()); 2538 } else { 2539 // If this is a constructor, instantiate the member initializers. 2540 if (const CXXConstructorDecl *Ctor = 2541 dyn_cast<CXXConstructorDecl>(PatternDecl)) { 2542 InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor, 2543 TemplateArgs); 2544 } 2545 2546 // Instantiate the function body. 2547 StmtResult Body = SubstStmt(Pattern, TemplateArgs); 2548 2549 if (Body.isInvalid()) 2550 Function->setInvalidDecl(); 2551 2552 ActOnFinishFunctionBody(Function, Body.get(), 2553 /*IsInstantiation=*/true); 2554 } 2555 2556 PerformDependentDiagnostics(PatternDecl, TemplateArgs); 2557 2558 savedContext.pop(); 2559 2560 DeclGroupRef DG(Function); 2561 Consumer.HandleTopLevelDecl(DG); 2562 2563 // This class may have local implicit instantiations that need to be 2564 // instantiation within this scope. 2565 PerformPendingInstantiations(/*LocalOnly=*/true); 2566 Scope.Exit(); 2567 2568 if (Recursive) { 2569 // Define any pending vtables. 2570 DefineUsedVTables(); 2571 2572 // Instantiate any pending implicit instantiations found during the 2573 // instantiation of this template. 2574 PerformPendingInstantiations(); 2575 2576 // Restore the set of pending vtables. 2577 assert(VTableUses.empty() && 2578 "VTableUses should be empty before it is discarded."); 2579 VTableUses.swap(SavedVTableUses); 2580 2581 // Restore the set of pending implicit instantiations. 2582 assert(PendingInstantiations.empty() && 2583 "PendingInstantiations should be empty before it is discarded."); 2584 PendingInstantiations.swap(SavedPendingInstantiations); 2585 } 2586} 2587 2588/// \brief Instantiate the definition of the given variable from its 2589/// template. 2590/// 2591/// \param PointOfInstantiation the point at which the instantiation was 2592/// required. Note that this is not precisely a "point of instantiation" 2593/// for the function, but it's close. 2594/// 2595/// \param Var the already-instantiated declaration of a static member 2596/// variable of a class template specialization. 2597/// 2598/// \param Recursive if true, recursively instantiates any functions that 2599/// are required by this instantiation. 2600/// 2601/// \param DefinitionRequired if true, then we are performing an explicit 2602/// instantiation where an out-of-line definition of the member variable 2603/// is required. Complain if there is no such definition. 2604void Sema::InstantiateStaticDataMemberDefinition( 2605 SourceLocation PointOfInstantiation, 2606 VarDecl *Var, 2607 bool Recursive, 2608 bool DefinitionRequired) { 2609 if (Var->isInvalidDecl()) 2610 return; 2611 2612 // Find the out-of-line definition of this static data member. 2613 VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); 2614 assert(Def && "This data member was not instantiated from a template?"); 2615 assert(Def->isStaticDataMember() && "Not a static data member?"); 2616 Def = Def->getOutOfLineDefinition(); 2617 2618 if (!Def) { 2619 // We did not find an out-of-line definition of this static data member, 2620 // so we won't perform any instantiation. Rather, we rely on the user to 2621 // instantiate this definition (or provide a specialization for it) in 2622 // another translation unit. 2623 if (DefinitionRequired) { 2624 Def = Var->getInstantiatedFromStaticDataMember(); 2625 Diag(PointOfInstantiation, 2626 diag::err_explicit_instantiation_undefined_member) 2627 << 2 << Var->getDeclName() << Var->getDeclContext(); 2628 Diag(Def->getLocation(), diag::note_explicit_instantiation_here); 2629 } else if (Var->getTemplateSpecializationKind() 2630 == TSK_ExplicitInstantiationDefinition) { 2631 PendingInstantiations.push_back( 2632 std::make_pair(Var, PointOfInstantiation)); 2633 } 2634 2635 return; 2636 } 2637 2638 // Never instantiate an explicit specialization. 2639 if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 2640 return; 2641 2642 // C++0x [temp.explicit]p9: 2643 // Except for inline functions, other explicit instantiation declarations 2644 // have the effect of suppressing the implicit instantiation of the entity 2645 // to which they refer. 2646 if (Var->getTemplateSpecializationKind() 2647 == TSK_ExplicitInstantiationDeclaration) 2648 return; 2649 2650 // If we already have a definition, we're done. 2651 if (Var->getDefinition()) 2652 return; 2653 2654 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); 2655 if (Inst) 2656 return; 2657 2658 // If we're performing recursive template instantiation, create our own 2659 // queue of pending implicit instantiations that we will instantiate later, 2660 // while we're still within our own instantiation context. 2661 SmallVector<VTableUse, 16> SavedVTableUses; 2662 std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; 2663 if (Recursive) { 2664 VTableUses.swap(SavedVTableUses); 2665 PendingInstantiations.swap(SavedPendingInstantiations); 2666 } 2667 2668 // Enter the scope of this instantiation. We don't use 2669 // PushDeclContext because we don't have a scope. 2670 ContextRAII previousContext(*this, Var->getDeclContext()); 2671 2672 VarDecl *OldVar = Var; 2673 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), 2674 getTemplateInstantiationArgs(Var))); 2675 2676 previousContext.pop(); 2677 2678 if (Var) { 2679 MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); 2680 assert(MSInfo && "Missing member specialization information?"); 2681 Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), 2682 MSInfo->getPointOfInstantiation()); 2683 DeclGroupRef DG(Var); 2684 Consumer.HandleTopLevelDecl(DG); 2685 } 2686 2687 if (Recursive) { 2688 // Define any newly required vtables. 2689 DefineUsedVTables(); 2690 2691 // Instantiate any pending implicit instantiations found during the 2692 // instantiation of this template. 2693 PerformPendingInstantiations(); 2694 2695 // Restore the set of pending vtables. 2696 assert(VTableUses.empty() && 2697 "VTableUses should be empty before it is discarded, " 2698 "while instantiating static data member."); 2699 VTableUses.swap(SavedVTableUses); 2700 2701 // Restore the set of pending implicit instantiations. 2702 assert(PendingInstantiations.empty() && 2703 "PendingInstantiations should be empty before it is discarded, " 2704 "while instantiating static data member."); 2705 PendingInstantiations.swap(SavedPendingInstantiations); 2706 } 2707} 2708 2709static MultiInitializer CreateMultiInitializer(SmallVectorImpl<Expr*> &Args, 2710 const CXXCtorInitializer *Init) { 2711 // FIXME: This is a hack that will do slightly the wrong thing for an 2712 // initializer of the form foo({...}). 2713 // The right thing to do would be to modify InstantiateInitializer to create 2714 // the MultiInitializer. 2715 if (Args.size() == 1 && isa<InitListExpr>(Args[0])) 2716 return MultiInitializer(Args[0]); 2717 return MultiInitializer(Init->getLParenLoc(), Args.data(), 2718 Args.size(), Init->getRParenLoc()); 2719} 2720 2721void 2722Sema::InstantiateMemInitializers(CXXConstructorDecl *New, 2723 const CXXConstructorDecl *Tmpl, 2724 const MultiLevelTemplateArgumentList &TemplateArgs) { 2725 2726 SmallVector<CXXCtorInitializer*, 4> NewInits; 2727 bool AnyErrors = false; 2728 2729 // Instantiate all the initializers. 2730 for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), 2731 InitsEnd = Tmpl->init_end(); 2732 Inits != InitsEnd; ++Inits) { 2733 CXXCtorInitializer *Init = *Inits; 2734 2735 // Only instantiate written initializers, let Sema re-construct implicit 2736 // ones. 2737 if (!Init->isWritten()) 2738 continue; 2739 2740 SourceLocation LParenLoc, RParenLoc; 2741 ASTOwningVector<Expr*> NewArgs(*this); 2742 2743 SourceLocation EllipsisLoc; 2744 2745 if (Init->isPackExpansion()) { 2746 // This is a pack expansion. We should expand it now. 2747 TypeLoc BaseTL = Init->getTypeSourceInfo()->getTypeLoc(); 2748 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 2749 collectUnexpandedParameterPacks(BaseTL, Unexpanded); 2750 bool ShouldExpand = false; 2751 bool RetainExpansion = false; 2752 llvm::Optional<unsigned> NumExpansions; 2753 if (CheckParameterPacksForExpansion(Init->getEllipsisLoc(), 2754 BaseTL.getSourceRange(), 2755 Unexpanded, 2756 TemplateArgs, ShouldExpand, 2757 RetainExpansion, 2758 NumExpansions)) { 2759 AnyErrors = true; 2760 New->setInvalidDecl(); 2761 continue; 2762 } 2763 assert(ShouldExpand && "Partial instantiation of base initializer?"); 2764 2765 // Loop over all of the arguments in the argument pack(s), 2766 for (unsigned I = 0; I != *NumExpansions; ++I) { 2767 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I); 2768 2769 // Instantiate the initializer. 2770 if (InstantiateInitializer(Init->getInit(), TemplateArgs, 2771 LParenLoc, NewArgs, RParenLoc)) { 2772 AnyErrors = true; 2773 break; 2774 } 2775 2776 // Instantiate the base type. 2777 TypeSourceInfo *BaseTInfo = SubstType(Init->getTypeSourceInfo(), 2778 TemplateArgs, 2779 Init->getSourceLocation(), 2780 New->getDeclName()); 2781 if (!BaseTInfo) { 2782 AnyErrors = true; 2783 break; 2784 } 2785 2786 // Build the initializer. 2787 MultiInitializer MultiInit(CreateMultiInitializer(NewArgs, Init)); 2788 MemInitResult NewInit = BuildBaseInitializer(BaseTInfo->getType(), 2789 BaseTInfo, MultiInit, 2790 New->getParent(), 2791 SourceLocation()); 2792 if (NewInit.isInvalid()) { 2793 AnyErrors = true; 2794 break; 2795 } 2796 2797 NewInits.push_back(NewInit.get()); 2798 NewArgs.clear(); 2799 } 2800 2801 continue; 2802 } 2803 2804 // Instantiate the initializer. 2805 if (InstantiateInitializer(Init->getInit(), TemplateArgs, 2806 LParenLoc, NewArgs, RParenLoc)) { 2807 AnyErrors = true; 2808 continue; 2809 } 2810 2811 MemInitResult NewInit; 2812 if (Init->isDelegatingInitializer() || Init->isBaseInitializer()) { 2813 TypeSourceInfo *TInfo = SubstType(Init->getTypeSourceInfo(), 2814 TemplateArgs, 2815 Init->getSourceLocation(), 2816 New->getDeclName()); 2817 if (!TInfo) { 2818 AnyErrors = true; 2819 New->setInvalidDecl(); 2820 continue; 2821 } 2822 2823 MultiInitializer MultiInit(CreateMultiInitializer(NewArgs, Init)); 2824 2825 if (Init->isBaseInitializer()) 2826 NewInit = BuildBaseInitializer(TInfo->getType(), TInfo, MultiInit, 2827 New->getParent(), EllipsisLoc); 2828 else 2829 NewInit = BuildDelegatingInitializer(TInfo, MultiInit, 2830 cast<CXXRecordDecl>(CurContext->getParent())); 2831 } else if (Init->isMemberInitializer()) { 2832 FieldDecl *Member = cast_or_null<FieldDecl>(FindInstantiatedDecl( 2833 Init->getMemberLocation(), 2834 Init->getMember(), 2835 TemplateArgs)); 2836 if (!Member) { 2837 AnyErrors = true; 2838 New->setInvalidDecl(); 2839 continue; 2840 } 2841 2842 MultiInitializer MultiInit(CreateMultiInitializer(NewArgs, Init)); 2843 NewInit = BuildMemberInitializer(Member, MultiInit, 2844 Init->getSourceLocation()); 2845 } else if (Init->isIndirectMemberInitializer()) { 2846 IndirectFieldDecl *IndirectMember = 2847 cast_or_null<IndirectFieldDecl>(FindInstantiatedDecl( 2848 Init->getMemberLocation(), 2849 Init->getIndirectMember(), TemplateArgs)); 2850 2851 if (!IndirectMember) { 2852 AnyErrors = true; 2853 New->setInvalidDecl(); 2854 continue; 2855 } 2856 2857 MultiInitializer MultiInit(CreateMultiInitializer(NewArgs, Init)); 2858 NewInit = BuildMemberInitializer(IndirectMember, MultiInit, 2859 Init->getSourceLocation()); 2860 } 2861 2862 if (NewInit.isInvalid()) { 2863 AnyErrors = true; 2864 New->setInvalidDecl(); 2865 } else { 2866 // FIXME: It would be nice if ASTOwningVector had a release function. 2867 NewArgs.take(); 2868 2869 NewInits.push_back(NewInit.get()); 2870 } 2871 } 2872 2873 // Assign all the initializers to the new constructor. 2874 ActOnMemInitializers(New, 2875 /*FIXME: ColonLoc */ 2876 SourceLocation(), 2877 NewInits.data(), NewInits.size(), 2878 AnyErrors); 2879} 2880 2881// TODO: this could be templated if the various decl types used the 2882// same method name. 2883static bool isInstantiationOf(ClassTemplateDecl *Pattern, 2884 ClassTemplateDecl *Instance) { 2885 Pattern = Pattern->getCanonicalDecl(); 2886 2887 do { 2888 Instance = Instance->getCanonicalDecl(); 2889 if (Pattern == Instance) return true; 2890 Instance = Instance->getInstantiatedFromMemberTemplate(); 2891 } while (Instance); 2892 2893 return false; 2894} 2895 2896static bool isInstantiationOf(FunctionTemplateDecl *Pattern, 2897 FunctionTemplateDecl *Instance) { 2898 Pattern = Pattern->getCanonicalDecl(); 2899 2900 do { 2901 Instance = Instance->getCanonicalDecl(); 2902 if (Pattern == Instance) return true; 2903 Instance = Instance->getInstantiatedFromMemberTemplate(); 2904 } while (Instance); 2905 2906 return false; 2907} 2908 2909static bool 2910isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern, 2911 ClassTemplatePartialSpecializationDecl *Instance) { 2912 Pattern 2913 = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl()); 2914 do { 2915 Instance = cast<ClassTemplatePartialSpecializationDecl>( 2916 Instance->getCanonicalDecl()); 2917 if (Pattern == Instance) 2918 return true; 2919 Instance = Instance->getInstantiatedFromMember(); 2920 } while (Instance); 2921 2922 return false; 2923} 2924 2925static bool isInstantiationOf(CXXRecordDecl *Pattern, 2926 CXXRecordDecl *Instance) { 2927 Pattern = Pattern->getCanonicalDecl(); 2928 2929 do { 2930 Instance = Instance->getCanonicalDecl(); 2931 if (Pattern == Instance) return true; 2932 Instance = Instance->getInstantiatedFromMemberClass(); 2933 } while (Instance); 2934 2935 return false; 2936} 2937 2938static bool isInstantiationOf(FunctionDecl *Pattern, 2939 FunctionDecl *Instance) { 2940 Pattern = Pattern->getCanonicalDecl(); 2941 2942 do { 2943 Instance = Instance->getCanonicalDecl(); 2944 if (Pattern == Instance) return true; 2945 Instance = Instance->getInstantiatedFromMemberFunction(); 2946 } while (Instance); 2947 2948 return false; 2949} 2950 2951static bool isInstantiationOf(EnumDecl *Pattern, 2952 EnumDecl *Instance) { 2953 Pattern = Pattern->getCanonicalDecl(); 2954 2955 do { 2956 Instance = Instance->getCanonicalDecl(); 2957 if (Pattern == Instance) return true; 2958 Instance = Instance->getInstantiatedFromMemberEnum(); 2959 } while (Instance); 2960 2961 return false; 2962} 2963 2964static bool isInstantiationOf(UsingShadowDecl *Pattern, 2965 UsingShadowDecl *Instance, 2966 ASTContext &C) { 2967 return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern; 2968} 2969 2970static bool isInstantiationOf(UsingDecl *Pattern, 2971 UsingDecl *Instance, 2972 ASTContext &C) { 2973 return C.getInstantiatedFromUsingDecl(Instance) == Pattern; 2974} 2975 2976static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern, 2977 UsingDecl *Instance, 2978 ASTContext &C) { 2979 return C.getInstantiatedFromUsingDecl(Instance) == Pattern; 2980} 2981 2982static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern, 2983 UsingDecl *Instance, 2984 ASTContext &C) { 2985 return C.getInstantiatedFromUsingDecl(Instance) == Pattern; 2986} 2987 2988static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, 2989 VarDecl *Instance) { 2990 assert(Instance->isStaticDataMember()); 2991 2992 Pattern = Pattern->getCanonicalDecl(); 2993 2994 do { 2995 Instance = Instance->getCanonicalDecl(); 2996 if (Pattern == Instance) return true; 2997 Instance = Instance->getInstantiatedFromStaticDataMember(); 2998 } while (Instance); 2999 3000 return false; 3001} 3002 3003// Other is the prospective instantiation 3004// D is the prospective pattern 3005static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { 3006 if (D->getKind() != Other->getKind()) { 3007 if (UnresolvedUsingTypenameDecl *UUD 3008 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 3009 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 3010 return isInstantiationOf(UUD, UD, Ctx); 3011 } 3012 } 3013 3014 if (UnresolvedUsingValueDecl *UUD 3015 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 3016 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 3017 return isInstantiationOf(UUD, UD, Ctx); 3018 } 3019 } 3020 3021 return false; 3022 } 3023 3024 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other)) 3025 return isInstantiationOf(cast<CXXRecordDecl>(D), Record); 3026 3027 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other)) 3028 return isInstantiationOf(cast<FunctionDecl>(D), Function); 3029 3030 if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other)) 3031 return isInstantiationOf(cast<EnumDecl>(D), Enum); 3032 3033 if (VarDecl *Var = dyn_cast<VarDecl>(Other)) 3034 if (Var->isStaticDataMember()) 3035 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var); 3036 3037 if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other)) 3038 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp); 3039 3040 if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other)) 3041 return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp); 3042 3043 if (ClassTemplatePartialSpecializationDecl *PartialSpec 3044 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Other)) 3045 return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D), 3046 PartialSpec); 3047 3048 if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) { 3049 if (!Field->getDeclName()) { 3050 // This is an unnamed field. 3051 return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == 3052 cast<FieldDecl>(D); 3053 } 3054 } 3055 3056 if (UsingDecl *Using = dyn_cast<UsingDecl>(Other)) 3057 return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx); 3058 3059 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other)) 3060 return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx); 3061 3062 return D->getDeclName() && isa<NamedDecl>(Other) && 3063 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName(); 3064} 3065 3066template<typename ForwardIterator> 3067static NamedDecl *findInstantiationOf(ASTContext &Ctx, 3068 NamedDecl *D, 3069 ForwardIterator first, 3070 ForwardIterator last) { 3071 for (; first != last; ++first) 3072 if (isInstantiationOf(Ctx, D, *first)) 3073 return cast<NamedDecl>(*first); 3074 3075 return 0; 3076} 3077 3078/// \brief Finds the instantiation of the given declaration context 3079/// within the current instantiation. 3080/// 3081/// \returns NULL if there was an error 3082DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC, 3083 const MultiLevelTemplateArgumentList &TemplateArgs) { 3084 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) { 3085 Decl* ID = FindInstantiatedDecl(Loc, D, TemplateArgs); 3086 return cast_or_null<DeclContext>(ID); 3087 } else return DC; 3088} 3089 3090/// \brief Find the instantiation of the given declaration within the 3091/// current instantiation. 3092/// 3093/// This routine is intended to be used when \p D is a declaration 3094/// referenced from within a template, that needs to mapped into the 3095/// corresponding declaration within an instantiation. For example, 3096/// given: 3097/// 3098/// \code 3099/// template<typename T> 3100/// struct X { 3101/// enum Kind { 3102/// KnownValue = sizeof(T) 3103/// }; 3104/// 3105/// bool getKind() const { return KnownValue; } 3106/// }; 3107/// 3108/// template struct X<int>; 3109/// \endcode 3110/// 3111/// In the instantiation of X<int>::getKind(), we need to map the 3112/// EnumConstantDecl for KnownValue (which refers to 3113/// X<T>::<Kind>::KnownValue) to its instantiation 3114/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs 3115/// this mapping from within the instantiation of X<int>. 3116NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, 3117 const MultiLevelTemplateArgumentList &TemplateArgs) { 3118 DeclContext *ParentDC = D->getDeclContext(); 3119 if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) || 3120 isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) || 3121 (ParentDC->isFunctionOrMethod() && ParentDC->isDependentContext())) { 3122 // D is a local of some kind. Look into the map of local 3123 // declarations to their instantiations. 3124 typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack; 3125 llvm::PointerUnion<Decl *, DeclArgumentPack *> *Found 3126 = CurrentInstantiationScope->findInstantiationOf(D); 3127 3128 if (Found) { 3129 if (Decl *FD = Found->dyn_cast<Decl *>()) 3130 return cast<NamedDecl>(FD); 3131 3132 unsigned PackIdx = ArgumentPackSubstitutionIndex; 3133 return cast<NamedDecl>((*Found->get<DeclArgumentPack *>())[PackIdx]); 3134 } 3135 3136 // If we didn't find the decl, then we must have a label decl that hasn't 3137 // been found yet. Lazily instantiate it and return it now. 3138 assert(isa<LabelDecl>(D)); 3139 3140 Decl *Inst = SubstDecl(D, CurContext, TemplateArgs); 3141 assert(Inst && "Failed to instantiate label??"); 3142 3143 CurrentInstantiationScope->InstantiatedLocal(D, Inst); 3144 return cast<LabelDecl>(Inst); 3145 } 3146 3147 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { 3148 if (!Record->isDependentContext()) 3149 return D; 3150 3151 // If the RecordDecl is actually the injected-class-name or a 3152 // "templated" declaration for a class template, class template 3153 // partial specialization, or a member class of a class template, 3154 // substitute into the injected-class-name of the class template 3155 // or partial specialization to find the new DeclContext. 3156 QualType T; 3157 ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate(); 3158 3159 if (ClassTemplate) { 3160 T = ClassTemplate->getInjectedClassNameSpecialization(); 3161 } else if (ClassTemplatePartialSpecializationDecl *PartialSpec 3162 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { 3163 ClassTemplate = PartialSpec->getSpecializedTemplate(); 3164 3165 // If we call SubstType with an InjectedClassNameType here we 3166 // can end up in an infinite loop. 3167 T = Context.getTypeDeclType(Record); 3168 assert(isa<InjectedClassNameType>(T) && 3169 "type of partial specialization is not an InjectedClassNameType"); 3170 T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); 3171 } 3172 3173 if (!T.isNull()) { 3174 // Substitute into the injected-class-name to get the type 3175 // corresponding to the instantiation we want, which may also be 3176 // the current instantiation (if we're in a template 3177 // definition). This substitution should never fail, since we 3178 // know we can instantiate the injected-class-name or we 3179 // wouldn't have gotten to the injected-class-name! 3180 3181 // FIXME: Can we use the CurrentInstantiationScope to avoid this 3182 // extra instantiation in the common case? 3183 T = SubstType(T, TemplateArgs, Loc, DeclarationName()); 3184 assert(!T.isNull() && "Instantiation of injected-class-name cannot fail."); 3185 3186 if (!T->isDependentType()) { 3187 assert(T->isRecordType() && "Instantiation must produce a record type"); 3188 return T->getAs<RecordType>()->getDecl(); 3189 } 3190 3191 // We are performing "partial" template instantiation to create 3192 // the member declarations for the members of a class template 3193 // specialization. Therefore, D is actually referring to something 3194 // in the current instantiation. Look through the current 3195 // context, which contains actual instantiations, to find the 3196 // instantiation of the "current instantiation" that D refers 3197 // to. 3198 bool SawNonDependentContext = false; 3199 for (DeclContext *DC = CurContext; !DC->isFileContext(); 3200 DC = DC->getParent()) { 3201 if (ClassTemplateSpecializationDecl *Spec 3202 = dyn_cast<ClassTemplateSpecializationDecl>(DC)) 3203 if (isInstantiationOf(ClassTemplate, 3204 Spec->getSpecializedTemplate())) 3205 return Spec; 3206 3207 if (!DC->isDependentContext()) 3208 SawNonDependentContext = true; 3209 } 3210 3211 // We're performing "instantiation" of a member of the current 3212 // instantiation while we are type-checking the 3213 // definition. Compute the declaration context and return that. 3214 assert(!SawNonDependentContext && 3215 "No dependent context while instantiating record"); 3216 DeclContext *DC = computeDeclContext(T); 3217 assert(DC && 3218 "Unable to find declaration for the current instantiation"); 3219 return cast<CXXRecordDecl>(DC); 3220 } 3221 3222 // Fall through to deal with other dependent record types (e.g., 3223 // anonymous unions in class templates). 3224 } 3225 3226 if (!ParentDC->isDependentContext()) 3227 return D; 3228 3229 ParentDC = FindInstantiatedContext(Loc, ParentDC, TemplateArgs); 3230 if (!ParentDC) 3231 return 0; 3232 3233 if (ParentDC != D->getDeclContext()) { 3234 // We performed some kind of instantiation in the parent context, 3235 // so now we need to look into the instantiated parent context to 3236 // find the instantiation of the declaration D. 3237 3238 // If our context used to be dependent, we may need to instantiate 3239 // it before performing lookup into that context. 3240 bool IsBeingInstantiated = false; 3241 if (CXXRecordDecl *Spec = dyn_cast<CXXRecordDecl>(ParentDC)) { 3242 if (!Spec->isDependentContext()) { 3243 QualType T = Context.getTypeDeclType(Spec); 3244 const RecordType *Tag = T->getAs<RecordType>(); 3245 assert(Tag && "type of non-dependent record is not a RecordType"); 3246 if (Tag->isBeingDefined()) 3247 IsBeingInstantiated = true; 3248 if (!Tag->isBeingDefined() && 3249 RequireCompleteType(Loc, T, diag::err_incomplete_type)) 3250 return 0; 3251 3252 ParentDC = Tag->getDecl(); 3253 } 3254 } 3255 3256 NamedDecl *Result = 0; 3257 if (D->getDeclName()) { 3258 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); 3259 Result = findInstantiationOf(Context, D, Found.first, Found.second); 3260 } else { 3261 // Since we don't have a name for the entity we're looking for, 3262 // our only option is to walk through all of the declarations to 3263 // find that name. This will occur in a few cases: 3264 // 3265 // - anonymous struct/union within a template 3266 // - unnamed class/struct/union/enum within a template 3267 // 3268 // FIXME: Find a better way to find these instantiations! 3269 Result = findInstantiationOf(Context, D, 3270 ParentDC->decls_begin(), 3271 ParentDC->decls_end()); 3272 } 3273 3274 if (!Result) { 3275 if (isa<UsingShadowDecl>(D)) { 3276 // UsingShadowDecls can instantiate to nothing because of using hiding. 3277 } else if (Diags.hasErrorOccurred()) { 3278 // We've already complained about something, so most likely this 3279 // declaration failed to instantiate. There's no point in complaining 3280 // further, since this is normal in invalid code. 3281 } else if (IsBeingInstantiated) { 3282 // The class in which this member exists is currently being 3283 // instantiated, and we haven't gotten around to instantiating this 3284 // member yet. This can happen when the code uses forward declarations 3285 // of member classes, and introduces ordering dependencies via 3286 // template instantiation. 3287 Diag(Loc, diag::err_member_not_yet_instantiated) 3288 << D->getDeclName() 3289 << Context.getTypeDeclType(cast<CXXRecordDecl>(ParentDC)); 3290 Diag(D->getLocation(), diag::note_non_instantiated_member_here); 3291 } else { 3292 // We should have found something, but didn't. 3293 llvm_unreachable("Unable to find instantiation of declaration!"); 3294 } 3295 } 3296 3297 D = Result; 3298 } 3299 3300 return D; 3301} 3302 3303/// \brief Performs template instantiation for all implicit template 3304/// instantiations we have seen until this point. 3305void Sema::PerformPendingInstantiations(bool LocalOnly) { 3306 // Load pending instantiations from the external source. 3307 if (!LocalOnly && ExternalSource) { 3308 SmallVector<std::pair<ValueDecl *, SourceLocation>, 4> Pending; 3309 ExternalSource->ReadPendingInstantiations(Pending); 3310 PendingInstantiations.insert(PendingInstantiations.begin(), 3311 Pending.begin(), Pending.end()); 3312 } 3313 3314 while (!PendingLocalImplicitInstantiations.empty() || 3315 (!LocalOnly && !PendingInstantiations.empty())) { 3316 PendingImplicitInstantiation Inst; 3317 3318 if (PendingLocalImplicitInstantiations.empty()) { 3319 Inst = PendingInstantiations.front(); 3320 PendingInstantiations.pop_front(); 3321 } else { 3322 Inst = PendingLocalImplicitInstantiations.front(); 3323 PendingLocalImplicitInstantiations.pop_front(); 3324 } 3325 3326 // Instantiate function definitions 3327 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) { 3328 PrettyDeclStackTraceEntry CrashInfo(*this, Function, SourceLocation(), 3329 "instantiating function definition"); 3330 bool DefinitionRequired = Function->getTemplateSpecializationKind() == 3331 TSK_ExplicitInstantiationDefinition; 3332 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true, 3333 DefinitionRequired); 3334 continue; 3335 } 3336 3337 // Instantiate static data member definitions. 3338 VarDecl *Var = cast<VarDecl>(Inst.first); 3339 assert(Var->isStaticDataMember() && "Not a static data member?"); 3340 3341 // Don't try to instantiate declarations if the most recent redeclaration 3342 // is invalid. 3343 if (Var->getMostRecentDeclaration()->isInvalidDecl()) 3344 continue; 3345 3346 // Check if the most recent declaration has changed the specialization kind 3347 // and removed the need for implicit instantiation. 3348 switch (Var->getMostRecentDeclaration()->getTemplateSpecializationKind()) { 3349 case TSK_Undeclared: 3350 llvm_unreachable("Cannot instantitiate an undeclared specialization."); 3351 case TSK_ExplicitInstantiationDeclaration: 3352 case TSK_ExplicitSpecialization: 3353 continue; // No longer need to instantiate this type. 3354 case TSK_ExplicitInstantiationDefinition: 3355 // We only need an instantiation if the pending instantiation *is* the 3356 // explicit instantiation. 3357 if (Var != Var->getMostRecentDeclaration()) continue; 3358 case TSK_ImplicitInstantiation: 3359 break; 3360 } 3361 3362 PrettyDeclStackTraceEntry CrashInfo(*this, Var, Var->getLocation(), 3363 "instantiating static data member " 3364 "definition"); 3365 3366 bool DefinitionRequired = Var->getTemplateSpecializationKind() == 3367 TSK_ExplicitInstantiationDefinition; 3368 InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true, 3369 DefinitionRequired); 3370 } 3371} 3372 3373void Sema::PerformDependentDiagnostics(const DeclContext *Pattern, 3374 const MultiLevelTemplateArgumentList &TemplateArgs) { 3375 for (DeclContext::ddiag_iterator I = Pattern->ddiag_begin(), 3376 E = Pattern->ddiag_end(); I != E; ++I) { 3377 DependentDiagnostic *DD = *I; 3378 3379 switch (DD->getKind()) { 3380 case DependentDiagnostic::Access: 3381 HandleDependentAccessCheck(*DD, TemplateArgs); 3382 break; 3383 } 3384 } 3385} 3386