SemaTemplateInstantiateDecl.cpp revision fd47648b5d351ff6d1a3e886e1c3d10712ba4675
1//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/ 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7//===----------------------------------------------------------------------===/ 8// 9// This file implements C++ template instantiation for declarations. 10// 11//===----------------------------------------------------------------------===/ 12#include "Sema.h" 13#include "clang/AST/ASTConsumer.h" 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclTemplate.h" 16#include "clang/AST/DeclVisitor.h" 17#include "clang/AST/Expr.h" 18#include "clang/Basic/PrettyStackTrace.h" 19#include "clang/Lex/Preprocessor.h" 20#include "llvm/Support/Compiler.h" 21 22using namespace clang; 23 24namespace { 25 class VISIBILITY_HIDDEN TemplateDeclInstantiator 26 : public DeclVisitor<TemplateDeclInstantiator, Decl *> { 27 Sema &SemaRef; 28 DeclContext *Owner; 29 const MultiLevelTemplateArgumentList &TemplateArgs; 30 31 void InstantiateAttrs(Decl *Tmpl, Decl *New); 32 33 public: 34 typedef Sema::OwningExprResult OwningExprResult; 35 36 TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner, 37 const MultiLevelTemplateArgumentList &TemplateArgs) 38 : SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { } 39 40 // FIXME: Once we get closer to completion, replace these manually-written 41 // declarations with automatically-generated ones from 42 // clang/AST/DeclNodes.def. 43 Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D); 44 Decl *VisitNamespaceDecl(NamespaceDecl *D); 45 Decl *VisitTypedefDecl(TypedefDecl *D); 46 Decl *VisitVarDecl(VarDecl *D); 47 Decl *VisitFieldDecl(FieldDecl *D); 48 Decl *VisitStaticAssertDecl(StaticAssertDecl *D); 49 Decl *VisitEnumDecl(EnumDecl *D); 50 Decl *VisitEnumConstantDecl(EnumConstantDecl *D); 51 Decl *VisitFriendDecl(FriendDecl *D); 52 Decl *VisitFunctionDecl(FunctionDecl *D, 53 TemplateParameterList *TemplateParams = 0); 54 Decl *VisitCXXRecordDecl(CXXRecordDecl *D); 55 Decl *VisitCXXMethodDecl(CXXMethodDecl *D, 56 TemplateParameterList *TemplateParams = 0); 57 Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D); 58 Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D); 59 Decl *VisitCXXConversionDecl(CXXConversionDecl *D); 60 ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D); 61 Decl *VisitClassTemplateDecl(ClassTemplateDecl *D); 62 Decl *VisitClassTemplatePartialSpecializationDecl( 63 ClassTemplatePartialSpecializationDecl *D); 64 Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D); 65 Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D); 66 Decl *VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D); 67 Decl *VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D); 68 Decl *VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D); 69 70 // Base case. FIXME: Remove once we can instantiate everything. 71 Decl *VisitDecl(Decl *) { 72 assert(false && "Template instantiation of unknown declaration kind!"); 73 return 0; 74 } 75 76 const LangOptions &getLangOptions() { 77 return SemaRef.getLangOptions(); 78 } 79 80 // Helper functions for instantiating methods. 81 QualType SubstFunctionType(FunctionDecl *D, 82 llvm::SmallVectorImpl<ParmVarDecl *> &Params); 83 bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl); 84 bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl); 85 86 TemplateParameterList * 87 SubstTemplateParams(TemplateParameterList *List); 88 89 bool InstantiateClassTemplatePartialSpecialization( 90 ClassTemplateDecl *ClassTemplate, 91 ClassTemplatePartialSpecializationDecl *PartialSpec); 92 }; 93} 94 95// FIXME: Is this too simple? 96void TemplateDeclInstantiator::InstantiateAttrs(Decl *Tmpl, Decl *New) { 97 for (const Attr *TmplAttr = Tmpl->getAttrs(); TmplAttr; 98 TmplAttr = TmplAttr->getNext()) { 99 100 // FIXME: Is cloning correct for all attributes? 101 Attr *NewAttr = TmplAttr->clone(SemaRef.Context); 102 103 New->addAttr(NewAttr); 104 } 105} 106 107Decl * 108TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { 109 assert(false && "Translation units cannot be instantiated"); 110 return D; 111} 112 113Decl * 114TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { 115 assert(false && "Namespaces cannot be instantiated"); 116 return D; 117} 118 119Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { 120 bool Invalid = false; 121 DeclaratorInfo *DI = D->getTypeDeclaratorInfo(); 122 if (DI->getType()->isDependentType()) { 123 DI = SemaRef.SubstType(DI, TemplateArgs, 124 D->getLocation(), D->getDeclName()); 125 if (!DI) { 126 Invalid = true; 127 DI = SemaRef.Context.getTrivialDeclaratorInfo(SemaRef.Context.IntTy); 128 } 129 } 130 131 // Create the new typedef 132 TypedefDecl *Typedef 133 = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(), 134 D->getIdentifier(), DI); 135 if (Invalid) 136 Typedef->setInvalidDecl(); 137 138 Owner->addDecl(Typedef); 139 140 return Typedef; 141} 142 143Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { 144 // Do substitution on the type of the declaration 145 DeclaratorInfo *DI = SemaRef.SubstType(D->getDeclaratorInfo(), 146 TemplateArgs, 147 D->getTypeSpecStartLoc(), 148 D->getDeclName()); 149 if (!DI) 150 return 0; 151 152 // Build the instantiated declaration 153 VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, 154 D->getLocation(), D->getIdentifier(), 155 DI->getType(), DI, 156 D->getStorageClass()); 157 Var->setThreadSpecified(D->isThreadSpecified()); 158 Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); 159 Var->setDeclaredInCondition(D->isDeclaredInCondition()); 160 161 // If we are instantiating a static data member defined 162 // out-of-line, the instantiation will have the same lexical 163 // context (which will be a namespace scope) as the template. 164 if (D->isOutOfLine()) 165 Var->setLexicalDeclContext(D->getLexicalDeclContext()); 166 167 // FIXME: In theory, we could have a previous declaration for variables that 168 // are not static data members. 169 bool Redeclaration = false; 170 SemaRef.CheckVariableDeclaration(Var, 0, Redeclaration); 171 172 if (D->isOutOfLine()) { 173 D->getLexicalDeclContext()->addDecl(Var); 174 Owner->makeDeclVisibleInContext(Var); 175 } else { 176 Owner->addDecl(Var); 177 } 178 179 // Link instantiations of static data members back to the template from 180 // which they were instantiated. 181 if (Var->isStaticDataMember()) 182 SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D, 183 TSK_ImplicitInstantiation); 184 185 if (D->getInit()) { 186 OwningExprResult Init 187 = SemaRef.SubstExpr(D->getInit(), TemplateArgs); 188 if (Init.isInvalid()) 189 Var->setInvalidDecl(); 190 else if (!D->getType()->isDependentType() && 191 !D->getInit()->isTypeDependent() && 192 !D->getInit()->isValueDependent()) { 193 // If neither the declaration's type nor its initializer are dependent, 194 // we don't want to redo all the checking, especially since the 195 // initializer might have been wrapped by a CXXConstructExpr since we did 196 // it the first time. 197 Var->setInit(SemaRef.Context, Init.takeAs<Expr>()); 198 } 199 else if (ParenListExpr *PLE = dyn_cast<ParenListExpr>((Expr *)Init.get())) { 200 // FIXME: We're faking all of the comma locations, which is suboptimal. 201 // Do we even need these comma locations? 202 llvm::SmallVector<SourceLocation, 4> FakeCommaLocs; 203 if (PLE->getNumExprs() > 0) { 204 FakeCommaLocs.reserve(PLE->getNumExprs() - 1); 205 for (unsigned I = 0, N = PLE->getNumExprs() - 1; I != N; ++I) { 206 Expr *E = PLE->getExpr(I)->Retain(); 207 FakeCommaLocs.push_back( 208 SemaRef.PP.getLocForEndOfToken(E->getLocEnd())); 209 } 210 PLE->getExpr(PLE->getNumExprs() - 1)->Retain(); 211 } 212 213 // Add the direct initializer to the declaration. 214 SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var), 215 PLE->getLParenLoc(), 216 Sema::MultiExprArg(SemaRef, 217 (void**)PLE->getExprs(), 218 PLE->getNumExprs()), 219 FakeCommaLocs.data(), 220 PLE->getRParenLoc()); 221 222 // When Init is destroyed, it will destroy the instantiated ParenListExpr; 223 // we've explicitly retained all of its subexpressions already. 224 } else 225 SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init), 226 D->hasCXXDirectInitializer()); 227 } else if (!Var->isStaticDataMember() || Var->isOutOfLine()) 228 SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false); 229 230 return Var; 231} 232 233Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { 234 bool Invalid = false; 235 DeclaratorInfo *DI = D->getDeclaratorInfo(); 236 if (DI->getType()->isDependentType()) { 237 DI = SemaRef.SubstType(DI, TemplateArgs, 238 D->getLocation(), D->getDeclName()); 239 if (!DI) { 240 DI = D->getDeclaratorInfo(); 241 Invalid = true; 242 } else if (DI->getType()->isFunctionType()) { 243 // C++ [temp.arg.type]p3: 244 // If a declaration acquires a function type through a type 245 // dependent on a template-parameter and this causes a 246 // declaration that does not use the syntactic form of a 247 // function declarator to have function type, the program is 248 // ill-formed. 249 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) 250 << DI->getType(); 251 Invalid = true; 252 } 253 } 254 255 Expr *BitWidth = D->getBitWidth(); 256 if (Invalid) 257 BitWidth = 0; 258 else if (BitWidth) { 259 // The bit-width expression is not potentially evaluated. 260 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 261 262 OwningExprResult InstantiatedBitWidth 263 = SemaRef.SubstExpr(BitWidth, TemplateArgs); 264 if (InstantiatedBitWidth.isInvalid()) { 265 Invalid = true; 266 BitWidth = 0; 267 } else 268 BitWidth = InstantiatedBitWidth.takeAs<Expr>(); 269 } 270 271 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), 272 DI->getType(), DI, 273 cast<RecordDecl>(Owner), 274 D->getLocation(), 275 D->isMutable(), 276 BitWidth, 277 D->getTypeSpecStartLoc(), 278 D->getAccess(), 279 0); 280 if (!Field) { 281 cast<Decl>(Owner)->setInvalidDecl(); 282 return 0; 283 } 284 285 InstantiateAttrs(D, Field); 286 287 if (Invalid) 288 Field->setInvalidDecl(); 289 290 if (!Field->getDeclName()) { 291 // Keep track of where this decl came from. 292 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); 293 } 294 295 Field->setImplicit(D->isImplicit()); 296 Owner->addDecl(Field); 297 298 return Field; 299} 300 301Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { 302 FriendDecl::FriendUnion FU; 303 304 // Handle friend type expressions by simply substituting template 305 // parameters into the pattern type. 306 if (Type *Ty = D->getFriendType()) { 307 QualType T = SemaRef.SubstType(QualType(Ty,0), TemplateArgs, 308 D->getLocation(), DeclarationName()); 309 if (T.isNull()) return 0; 310 311 assert(getLangOptions().CPlusPlus0x || T->isRecordType()); 312 FU = T.getTypePtr(); 313 314 // Handle everything else by appropriate substitution. 315 } else { 316 NamedDecl *ND = D->getFriendDecl(); 317 assert(ND && "friend decl must be a decl or a type!"); 318 319 // FIXME: We have a problem here, because the nested call to Visit(ND) 320 // will inject the thing that the friend references into the current 321 // owner, which is wrong. 322 Decl *NewND = Visit(ND); 323 if (!NewND) return 0; 324 325 FU = cast<NamedDecl>(NewND); 326 } 327 328 FriendDecl *FD = 329 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), FU, 330 D->getFriendLoc()); 331 FD->setAccess(AS_public); 332 Owner->addDecl(FD); 333 return FD; 334} 335 336Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { 337 Expr *AssertExpr = D->getAssertExpr(); 338 339 // The expression in a static assertion is not potentially evaluated. 340 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 341 342 OwningExprResult InstantiatedAssertExpr 343 = SemaRef.SubstExpr(AssertExpr, TemplateArgs); 344 if (InstantiatedAssertExpr.isInvalid()) 345 return 0; 346 347 OwningExprResult Message(SemaRef, D->getMessage()); 348 D->getMessage()->Retain(); 349 Decl *StaticAssert 350 = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), 351 move(InstantiatedAssertExpr), 352 move(Message)).getAs<Decl>(); 353 return StaticAssert; 354} 355 356Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { 357 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, 358 D->getLocation(), D->getIdentifier(), 359 D->getTagKeywordLoc(), 360 /*PrevDecl=*/0); 361 Enum->setInstantiationOfMemberEnum(D); 362 Enum->setAccess(D->getAccess()); 363 Owner->addDecl(Enum); 364 Enum->startDefinition(); 365 366 llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators; 367 368 EnumConstantDecl *LastEnumConst = 0; 369 for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), 370 ECEnd = D->enumerator_end(); 371 EC != ECEnd; ++EC) { 372 // The specified value for the enumerator. 373 OwningExprResult Value = SemaRef.Owned((Expr *)0); 374 if (Expr *UninstValue = EC->getInitExpr()) { 375 // The enumerator's value expression is not potentially evaluated. 376 EnterExpressionEvaluationContext Unevaluated(SemaRef, 377 Action::Unevaluated); 378 379 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); 380 } 381 382 // Drop the initial value and continue. 383 bool isInvalid = false; 384 if (Value.isInvalid()) { 385 Value = SemaRef.Owned((Expr *)0); 386 isInvalid = true; 387 } 388 389 EnumConstantDecl *EnumConst 390 = SemaRef.CheckEnumConstant(Enum, LastEnumConst, 391 EC->getLocation(), EC->getIdentifier(), 392 move(Value)); 393 394 if (isInvalid) { 395 if (EnumConst) 396 EnumConst->setInvalidDecl(); 397 Enum->setInvalidDecl(); 398 } 399 400 if (EnumConst) { 401 Enum->addDecl(EnumConst); 402 Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst)); 403 LastEnumConst = EnumConst; 404 } 405 } 406 407 // FIXME: Fixup LBraceLoc and RBraceLoc 408 // FIXME: Empty Scope and AttributeList (required to handle attribute packed). 409 SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), 410 Sema::DeclPtrTy::make(Enum), 411 &Enumerators[0], Enumerators.size(), 412 0, 0); 413 414 return Enum; 415} 416 417Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { 418 assert(false && "EnumConstantDecls can only occur within EnumDecls."); 419 return 0; 420} 421 422namespace { 423 class SortDeclByLocation { 424 SourceManager &SourceMgr; 425 426 public: 427 explicit SortDeclByLocation(SourceManager &SourceMgr) 428 : SourceMgr(SourceMgr) { } 429 430 bool operator()(const Decl *X, const Decl *Y) const { 431 return SourceMgr.isBeforeInTranslationUnit(X->getLocation(), 432 Y->getLocation()); 433 } 434 }; 435} 436 437Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { 438 // Create a local instantiation scope for this class template, which 439 // will contain the instantiations of the template parameters. 440 Sema::LocalInstantiationScope Scope(SemaRef); 441 TemplateParameterList *TempParams = D->getTemplateParameters(); 442 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 443 if (!InstParams) 444 return NULL; 445 446 CXXRecordDecl *Pattern = D->getTemplatedDecl(); 447 CXXRecordDecl *RecordInst 448 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner, 449 Pattern->getLocation(), Pattern->getIdentifier(), 450 Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL, 451 /*DelayTypeCreation=*/true); 452 453 ClassTemplateDecl *Inst 454 = ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), 455 D->getIdentifier(), InstParams, RecordInst, 0); 456 RecordInst->setDescribedClassTemplate(Inst); 457 if (D->getFriendObjectKind()) 458 Inst->setObjectOfFriendDecl(true); 459 else 460 Inst->setAccess(D->getAccess()); 461 Inst->setInstantiatedFromMemberTemplate(D); 462 463 // Trigger creation of the type for the instantiation. 464 SemaRef.Context.getTypeDeclType(RecordInst); 465 466 // Finish handling of friends. 467 if (Inst->getFriendObjectKind()) { 468 return Inst; 469 } 470 471 Owner->addDecl(Inst); 472 473 // First, we sort the partial specializations by location, so 474 // that we instantiate them in the order they were declared. 475 llvm::SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 476 for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator 477 P = D->getPartialSpecializations().begin(), 478 PEnd = D->getPartialSpecializations().end(); 479 P != PEnd; ++P) 480 PartialSpecs.push_back(&*P); 481 std::sort(PartialSpecs.begin(), PartialSpecs.end(), 482 SortDeclByLocation(SemaRef.SourceMgr)); 483 484 // Instantiate all of the partial specializations of this member class 485 // template. 486 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) 487 InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]); 488 489 return Inst; 490} 491 492Decl * 493TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( 494 ClassTemplatePartialSpecializationDecl *D) { 495 ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); 496 497 // Lookup the already-instantiated declaration in the instantiation 498 // of the class template and return that. 499 DeclContext::lookup_result Found 500 = Owner->lookup(ClassTemplate->getDeclName()); 501 if (Found.first == Found.second) 502 return 0; 503 504 ClassTemplateDecl *InstClassTemplate 505 = dyn_cast<ClassTemplateDecl>(*Found.first); 506 if (!InstClassTemplate) 507 return 0; 508 509 Decl *DCanon = D->getCanonicalDecl(); 510 for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator 511 P = InstClassTemplate->getPartialSpecializations().begin(), 512 PEnd = InstClassTemplate->getPartialSpecializations().end(); 513 P != PEnd; ++P) { 514 if (P->getInstantiatedFromMember()->getCanonicalDecl() == DCanon) 515 return &*P; 516 } 517 518 return 0; 519} 520 521Decl * 522TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { 523 // Create a local instantiation scope for this function template, which 524 // will contain the instantiations of the template parameters and then get 525 // merged with the local instantiation scope for the function template 526 // itself. 527 Sema::LocalInstantiationScope Scope(SemaRef); 528 529 TemplateParameterList *TempParams = D->getTemplateParameters(); 530 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 531 if (!InstParams) 532 return NULL; 533 534 FunctionDecl *Instantiated = 0; 535 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl())) 536 Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod, 537 InstParams)); 538 else 539 Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl( 540 D->getTemplatedDecl(), 541 InstParams)); 542 543 if (!Instantiated) 544 return 0; 545 546 // Link the instantiated function template declaration to the function 547 // template from which it was instantiated. 548 FunctionTemplateDecl *InstTemplate 549 = Instantiated->getDescribedFunctionTemplate(); 550 InstTemplate->setAccess(D->getAccess()); 551 assert(InstTemplate && 552 "VisitFunctionDecl/CXXMethodDecl didn't create a template!"); 553 if (!InstTemplate->getInstantiatedFromMemberTemplate()) 554 InstTemplate->setInstantiatedFromMemberTemplate(D); 555 556 // Add non-friends into the owner. 557 if (!InstTemplate->getFriendObjectKind()) 558 Owner->addDecl(InstTemplate); 559 return InstTemplate; 560} 561 562Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { 563 CXXRecordDecl *PrevDecl = 0; 564 if (D->isInjectedClassName()) 565 PrevDecl = cast<CXXRecordDecl>(Owner); 566 567 CXXRecordDecl *Record 568 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, 569 D->getLocation(), D->getIdentifier(), 570 D->getTagKeywordLoc(), PrevDecl); 571 Record->setImplicit(D->isImplicit()); 572 // FIXME: Check against AS_none is an ugly hack to work around the issue that 573 // the tag decls introduced by friend class declarations don't have an access 574 // specifier. Remove once this area of the code gets sorted out. 575 if (D->getAccess() != AS_none) 576 Record->setAccess(D->getAccess()); 577 if (!D->isInjectedClassName()) 578 Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); 579 580 // If the original function was part of a friend declaration, 581 // inherit its namespace state. 582 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) 583 Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); 584 585 Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion()); 586 587 Owner->addDecl(Record); 588 return Record; 589} 590 591/// Normal class members are of more specific types and therefore 592/// don't make it here. This function serves two purposes: 593/// 1) instantiating function templates 594/// 2) substituting friend declarations 595/// FIXME: preserve function definitions in case #2 596 Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, 597 TemplateParameterList *TemplateParams) { 598 // Check whether there is already a function template specialization for 599 // this declaration. 600 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 601 void *InsertPos = 0; 602 if (FunctionTemplate && !TemplateParams) { 603 llvm::FoldingSetNodeID ID; 604 FunctionTemplateSpecializationInfo::Profile(ID, 605 TemplateArgs.getInnermost().getFlatArgumentList(), 606 TemplateArgs.getInnermost().flat_size(), 607 SemaRef.Context); 608 609 FunctionTemplateSpecializationInfo *Info 610 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 611 InsertPos); 612 613 // If we already have a function template specialization, return it. 614 if (Info) 615 return Info->Function; 616 } 617 618 Sema::LocalInstantiationScope Scope(SemaRef, TemplateParams != 0); 619 620 llvm::SmallVector<ParmVarDecl *, 4> Params; 621 QualType T = SubstFunctionType(D, Params); 622 if (T.isNull()) 623 return 0; 624 625 // Build the instantiated method declaration. 626 DeclContext *DC = SemaRef.FindInstantiatedContext(D->getDeclContext(), 627 TemplateArgs); 628 FunctionDecl *Function = 629 FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(), 630 D->getDeclName(), T, D->getDeclaratorInfo(), 631 D->getStorageClass(), 632 D->isInlineSpecified(), D->hasWrittenPrototype()); 633 Function->setLexicalDeclContext(Owner); 634 635 // Attach the parameters 636 for (unsigned P = 0; P < Params.size(); ++P) 637 Params[P]->setOwningFunction(Function); 638 Function->setParams(SemaRef.Context, Params.data(), Params.size()); 639 640 if (TemplateParams) { 641 // Our resulting instantiation is actually a function template, since we 642 // are substituting only the outer template parameters. For example, given 643 // 644 // template<typename T> 645 // struct X { 646 // template<typename U> friend void f(T, U); 647 // }; 648 // 649 // X<int> x; 650 // 651 // We are instantiating the friend function template "f" within X<int>, 652 // which means substituting int for T, but leaving "f" as a friend function 653 // template. 654 // Build the function template itself. 655 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Owner, 656 Function->getLocation(), 657 Function->getDeclName(), 658 TemplateParams, Function); 659 Function->setDescribedFunctionTemplate(FunctionTemplate); 660 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 661 } 662 663 if (InitFunctionInstantiation(Function, D)) 664 Function->setInvalidDecl(); 665 666 bool Redeclaration = false; 667 bool OverloadableAttrRequired = false; 668 669 NamedDecl *PrevDecl = 0; 670 if (TemplateParams || !FunctionTemplate) { 671 // Look only into the namespace where the friend would be declared to 672 // find a previous declaration. This is the innermost enclosing namespace, 673 // as described in ActOnFriendFunctionDecl. 674 Sema::LookupResult R; 675 SemaRef.LookupQualifiedName(R, DC, Function->getDeclName(), 676 Sema::LookupOrdinaryName, true); 677 678 PrevDecl = R.getAsSingleDecl(SemaRef.Context); 679 680 // In C++, the previous declaration we find might be a tag type 681 // (class or enum). In this case, the new declaration will hide the 682 // tag type. Note that this does does not apply if we're declaring a 683 // typedef (C++ [dcl.typedef]p4). 684 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 685 PrevDecl = 0; 686 } 687 688 SemaRef.CheckFunctionDeclaration(Function, PrevDecl, false, Redeclaration, 689 /*FIXME:*/OverloadableAttrRequired); 690 691 // If the original function was part of a friend declaration, 692 // inherit its namespace state and add it to the owner. 693 NamedDecl *FromFriendD 694 = TemplateParams? cast<NamedDecl>(D->getDescribedFunctionTemplate()) : D; 695 if (FromFriendD->getFriendObjectKind()) { 696 NamedDecl *ToFriendD = 0; 697 if (TemplateParams) { 698 ToFriendD = cast<NamedDecl>(FunctionTemplate); 699 PrevDecl = FunctionTemplate->getPreviousDeclaration(); 700 } else { 701 ToFriendD = Function; 702 PrevDecl = Function->getPreviousDeclaration(); 703 } 704 ToFriendD->setObjectOfFriendDecl(PrevDecl != NULL); 705 if (!Owner->isDependentContext() && !PrevDecl) 706 DC->makeDeclVisibleInContext(ToFriendD, /* Recoverable = */ false); 707 708 if (!TemplateParams) 709 Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 710 } 711 712 if (FunctionTemplate && !TemplateParams) { 713 // Record this function template specialization. 714 Function->setFunctionTemplateSpecialization(SemaRef.Context, 715 FunctionTemplate, 716 &TemplateArgs.getInnermost(), 717 InsertPos); 718 } 719 720 return Function; 721} 722 723Decl * 724TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, 725 TemplateParameterList *TemplateParams) { 726 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 727 void *InsertPos = 0; 728 if (FunctionTemplate && !TemplateParams) { 729 // We are creating a function template specialization from a function 730 // template. Check whether there is already a function template 731 // specialization for this particular set of template arguments. 732 llvm::FoldingSetNodeID ID; 733 FunctionTemplateSpecializationInfo::Profile(ID, 734 TemplateArgs.getInnermost().getFlatArgumentList(), 735 TemplateArgs.getInnermost().flat_size(), 736 SemaRef.Context); 737 738 FunctionTemplateSpecializationInfo *Info 739 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 740 InsertPos); 741 742 // If we already have a function template specialization, return it. 743 if (Info) 744 return Info->Function; 745 } 746 747 Sema::LocalInstantiationScope Scope(SemaRef, TemplateParams != 0); 748 749 llvm::SmallVector<ParmVarDecl *, 4> Params; 750 QualType T = SubstFunctionType(D, Params); 751 if (T.isNull()) 752 return 0; 753 754 // Build the instantiated method declaration. 755 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 756 CXXMethodDecl *Method = 0; 757 758 DeclarationName Name = D->getDeclName(); 759 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 760 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 761 Name = SemaRef.Context.DeclarationNames.getCXXConstructorName( 762 SemaRef.Context.getCanonicalType(ClassTy)); 763 Method = CXXConstructorDecl::Create(SemaRef.Context, Record, 764 Constructor->getLocation(), 765 Name, T, 766 Constructor->getDeclaratorInfo(), 767 Constructor->isExplicit(), 768 Constructor->isInlineSpecified(), false); 769 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 770 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 771 Name = SemaRef.Context.DeclarationNames.getCXXDestructorName( 772 SemaRef.Context.getCanonicalType(ClassTy)); 773 Method = CXXDestructorDecl::Create(SemaRef.Context, Record, 774 Destructor->getLocation(), Name, 775 T, Destructor->isInlineSpecified(), false); 776 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) { 777 CanQualType ConvTy 778 = SemaRef.Context.getCanonicalType( 779 T->getAs<FunctionType>()->getResultType()); 780 Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName( 781 ConvTy); 782 Method = CXXConversionDecl::Create(SemaRef.Context, Record, 783 Conversion->getLocation(), Name, 784 T, Conversion->getDeclaratorInfo(), 785 Conversion->isInlineSpecified(), 786 Conversion->isExplicit()); 787 } else { 788 Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(), 789 D->getDeclName(), T, D->getDeclaratorInfo(), 790 D->isStatic(), D->isInlineSpecified()); 791 } 792 793 if (TemplateParams) { 794 // Our resulting instantiation is actually a function template, since we 795 // are substituting only the outer template parameters. For example, given 796 // 797 // template<typename T> 798 // struct X { 799 // template<typename U> void f(T, U); 800 // }; 801 // 802 // X<int> x; 803 // 804 // We are instantiating the member template "f" within X<int>, which means 805 // substituting int for T, but leaving "f" as a member function template. 806 // Build the function template itself. 807 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, 808 Method->getLocation(), 809 Method->getDeclName(), 810 TemplateParams, Method); 811 if (D->isOutOfLine()) 812 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 813 Method->setDescribedFunctionTemplate(FunctionTemplate); 814 } else if (!FunctionTemplate) 815 Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 816 817 // If we are instantiating a member function defined 818 // out-of-line, the instantiation will have the same lexical 819 // context (which will be a namespace scope) as the template. 820 if (D->isOutOfLine()) 821 Method->setLexicalDeclContext(D->getLexicalDeclContext()); 822 823 // Attach the parameters 824 for (unsigned P = 0; P < Params.size(); ++P) 825 Params[P]->setOwningFunction(Method); 826 Method->setParams(SemaRef.Context, Params.data(), Params.size()); 827 828 if (InitMethodInstantiation(Method, D)) 829 Method->setInvalidDecl(); 830 831 NamedDecl *PrevDecl = 0; 832 833 if (!FunctionTemplate || TemplateParams) { 834 Sema::LookupResult R; 835 SemaRef.LookupQualifiedName(R, Owner, Name, Sema::LookupOrdinaryName, true); 836 PrevDecl = R.getAsSingleDecl(SemaRef.Context); 837 838 // In C++, the previous declaration we find might be a tag type 839 // (class or enum). In this case, the new declaration will hide the 840 // tag type. Note that this does does not apply if we're declaring a 841 // typedef (C++ [dcl.typedef]p4). 842 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag) 843 PrevDecl = 0; 844 } 845 846 if (FunctionTemplate && !TemplateParams) 847 // Record this function template specialization. 848 Method->setFunctionTemplateSpecialization(SemaRef.Context, 849 FunctionTemplate, 850 &TemplateArgs.getInnermost(), 851 InsertPos); 852 853 bool Redeclaration = false; 854 bool OverloadableAttrRequired = false; 855 SemaRef.CheckFunctionDeclaration(Method, PrevDecl, false, Redeclaration, 856 /*FIXME:*/OverloadableAttrRequired); 857 858 if (!FunctionTemplate && (!Method->isInvalidDecl() || !PrevDecl) && 859 !Method->getFriendObjectKind()) 860 Owner->addDecl(Method); 861 862 return Method; 863} 864 865Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { 866 return VisitCXXMethodDecl(D); 867} 868 869Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { 870 return VisitCXXMethodDecl(D); 871} 872 873Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { 874 return VisitCXXMethodDecl(D); 875} 876 877ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { 878 QualType T; 879 DeclaratorInfo *DI = D->getDeclaratorInfo(); 880 if (DI) { 881 DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), 882 D->getDeclName()); 883 if (DI) T = DI->getType(); 884 } else { 885 T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(), 886 D->getDeclName()); 887 DI = 0; 888 } 889 890 if (T.isNull()) 891 return 0; 892 893 T = SemaRef.adjustParameterType(T); 894 895 // Allocate the parameter 896 ParmVarDecl *Param 897 = ParmVarDecl::Create(SemaRef.Context, Owner, D->getLocation(), 898 D->getIdentifier(), T, DI, D->getStorageClass(), 0); 899 900 // Mark the default argument as being uninstantiated. 901 if (D->hasUninstantiatedDefaultArg()) 902 Param->setUninstantiatedDefaultArg(D->getUninstantiatedDefaultArg()); 903 else if (Expr *Arg = D->getDefaultArg()) 904 Param->setUninstantiatedDefaultArg(Arg); 905 906 // Note: we don't try to instantiate function parameters until after 907 // we've instantiated the function's type. Therefore, we don't have 908 // to check for 'void' parameter types here. 909 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 910 return Param; 911} 912 913Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( 914 TemplateTypeParmDecl *D) { 915 // TODO: don't always clone when decls are refcounted. 916 const Type* T = D->getTypeForDecl(); 917 assert(T->isTemplateTypeParmType()); 918 const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>(); 919 920 TemplateTypeParmDecl *Inst = 921 TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 922 TTPT->getDepth() - 1, TTPT->getIndex(), 923 TTPT->getName(), 924 D->wasDeclaredWithTypename(), 925 D->isParameterPack()); 926 927 if (D->hasDefaultArgument()) 928 Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); 929 930 // Introduce this template parameter's instantiation into the instantiation 931 // scope. 932 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst); 933 934 return Inst; 935} 936 937Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( 938 NonTypeTemplateParmDecl *D) { 939 // Substitute into the type of the non-type template parameter. 940 QualType T; 941 DeclaratorInfo *DI = D->getDeclaratorInfo(); 942 if (DI) { 943 DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), 944 D->getDeclName()); 945 if (DI) T = DI->getType(); 946 } else { 947 T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(), 948 D->getDeclName()); 949 DI = 0; 950 } 951 if (T.isNull()) 952 return 0; 953 954 // Check that this type is acceptable for a non-type template parameter. 955 bool Invalid = false; 956 T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation()); 957 if (T.isNull()) { 958 T = SemaRef.Context.IntTy; 959 Invalid = true; 960 } 961 962 NonTypeTemplateParmDecl *Param 963 = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 964 D->getDepth() - 1, D->getPosition(), 965 D->getIdentifier(), T, DI); 966 if (Invalid) 967 Param->setInvalidDecl(); 968 969 Param->setDefaultArgument(D->getDefaultArgument()); 970 971 // Introduce this template parameter's instantiation into the instantiation 972 // scope. 973 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 974 return Param; 975} 976 977Decl * 978TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( 979 TemplateTemplateParmDecl *D) { 980 // Instantiate the template parameter list of the template template parameter. 981 TemplateParameterList *TempParams = D->getTemplateParameters(); 982 TemplateParameterList *InstParams; 983 { 984 // Perform the actual substitution of template parameters within a new, 985 // local instantiation scope. 986 Sema::LocalInstantiationScope Scope(SemaRef); 987 InstParams = SubstTemplateParams(TempParams); 988 if (!InstParams) 989 return NULL; 990 } 991 992 // Build the template template parameter. 993 TemplateTemplateParmDecl *Param 994 = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 995 D->getDepth() - 1, D->getPosition(), 996 D->getIdentifier(), InstParams); 997 Param->setDefaultArgument(D->getDefaultArgument()); 998 999 // Introduce this template parameter's instantiation into the instantiation 1000 // scope. 1001 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 1002 1003 return Param; 1004} 1005 1006Decl * 1007TemplateDeclInstantiator::VisitUnresolvedUsingDecl(UnresolvedUsingDecl *D) { 1008 NestedNameSpecifier *NNS = 1009 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 1010 D->getTargetNestedNameRange(), 1011 TemplateArgs); 1012 if (!NNS) 1013 return 0; 1014 1015 CXXScopeSpec SS; 1016 SS.setRange(D->getTargetNestedNameRange()); 1017 SS.setScopeRep(NNS); 1018 1019 NamedDecl *UD = 1020 SemaRef.BuildUsingDeclaration(D->getLocation(), SS, 1021 D->getTargetNameLocation(), 1022 D->getTargetName(), 0, D->isTypeName()); 1023 if (UD) 1024 SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD), 1025 D); 1026 return UD; 1027} 1028 1029Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, 1030 const MultiLevelTemplateArgumentList &TemplateArgs) { 1031 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); 1032 return Instantiator.Visit(D); 1033} 1034 1035/// \brief Instantiates a nested template parameter list in the current 1036/// instantiation context. 1037/// 1038/// \param L The parameter list to instantiate 1039/// 1040/// \returns NULL if there was an error 1041TemplateParameterList * 1042TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { 1043 // Get errors for all the parameters before bailing out. 1044 bool Invalid = false; 1045 1046 unsigned N = L->size(); 1047 typedef llvm::SmallVector<NamedDecl *, 8> ParamVector; 1048 ParamVector Params; 1049 Params.reserve(N); 1050 for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); 1051 PI != PE; ++PI) { 1052 NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); 1053 Params.push_back(D); 1054 Invalid = Invalid || !D || D->isInvalidDecl(); 1055 } 1056 1057 // Clean up if we had an error. 1058 if (Invalid) { 1059 for (ParamVector::iterator PI = Params.begin(), PE = Params.end(); 1060 PI != PE; ++PI) 1061 if (*PI) 1062 (*PI)->Destroy(SemaRef.Context); 1063 return NULL; 1064 } 1065 1066 TemplateParameterList *InstL 1067 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), 1068 L->getLAngleLoc(), &Params.front(), N, 1069 L->getRAngleLoc()); 1070 return InstL; 1071} 1072 1073/// \brief Instantiate the declaration of a class template partial 1074/// specialization. 1075/// 1076/// \param ClassTemplate the (instantiated) class template that is partially 1077// specialized by the instantiation of \p PartialSpec. 1078/// 1079/// \param PartialSpec the (uninstantiated) class template partial 1080/// specialization that we are instantiating. 1081/// 1082/// \returns true if there was an error, false otherwise. 1083bool 1084TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( 1085 ClassTemplateDecl *ClassTemplate, 1086 ClassTemplatePartialSpecializationDecl *PartialSpec) { 1087 // Create a local instantiation scope for this class template partial 1088 // specialization, which will contain the instantiations of the template 1089 // parameters. 1090 Sema::LocalInstantiationScope Scope(SemaRef); 1091 1092 // Substitute into the template parameters of the class template partial 1093 // specialization. 1094 TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); 1095 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 1096 if (!InstParams) 1097 return true; 1098 1099 // Substitute into the template arguments of the class template partial 1100 // specialization. 1101 const TemplateArgumentLoc *PartialSpecTemplateArgs 1102 = PartialSpec->getTemplateArgsAsWritten(); 1103 unsigned N = PartialSpec->getNumTemplateArgsAsWritten(); 1104 1105 llvm::SmallVector<TemplateArgumentLoc, 4> InstTemplateArgs(N); 1106 for (unsigned I = 0; I != N; ++I) { 1107 if (SemaRef.Subst(PartialSpecTemplateArgs[I], InstTemplateArgs[I], 1108 TemplateArgs)) 1109 return true; 1110 } 1111 1112 1113 // Check that the template argument list is well-formed for this 1114 // class template. 1115 TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(), 1116 InstTemplateArgs.size()); 1117 if (SemaRef.CheckTemplateArgumentList(ClassTemplate, 1118 PartialSpec->getLocation(), 1119 /*FIXME:*/PartialSpec->getLocation(), 1120 InstTemplateArgs.data(), 1121 InstTemplateArgs.size(), 1122 /*FIXME:*/PartialSpec->getLocation(), 1123 false, 1124 Converted)) 1125 return true; 1126 1127 // Figure out where to insert this class template partial specialization 1128 // in the member template's set of class template partial specializations. 1129 llvm::FoldingSetNodeID ID; 1130 ClassTemplatePartialSpecializationDecl::Profile(ID, 1131 Converted.getFlatArguments(), 1132 Converted.flatSize(), 1133 SemaRef.Context); 1134 void *InsertPos = 0; 1135 ClassTemplateSpecializationDecl *PrevDecl 1136 = ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID, 1137 InsertPos); 1138 1139 // Build the canonical type that describes the converted template 1140 // arguments of the class template partial specialization. 1141 QualType CanonType 1142 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), 1143 Converted.getFlatArguments(), 1144 Converted.flatSize()); 1145 1146 // Build the fully-sugared type for this class template 1147 // specialization as the user wrote in the specialization 1148 // itself. This means that we'll pretty-print the type retrieved 1149 // from the specialization's declaration the way that the user 1150 // actually wrote the specialization, rather than formatting the 1151 // name based on the "canonical" representation used to store the 1152 // template arguments in the specialization. 1153 QualType WrittenTy 1154 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), 1155 InstTemplateArgs.data(), 1156 InstTemplateArgs.size(), 1157 CanonType); 1158 1159 if (PrevDecl) { 1160 // We've already seen a partial specialization with the same template 1161 // parameters and template arguments. This can happen, for example, when 1162 // substituting the outer template arguments ends up causing two 1163 // class template partial specializations of a member class template 1164 // to have identical forms, e.g., 1165 // 1166 // template<typename T, typename U> 1167 // struct Outer { 1168 // template<typename X, typename Y> struct Inner; 1169 // template<typename Y> struct Inner<T, Y>; 1170 // template<typename Y> struct Inner<U, Y>; 1171 // }; 1172 // 1173 // Outer<int, int> outer; // error: the partial specializations of Inner 1174 // // have the same signature. 1175 SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared) 1176 << WrittenTy; 1177 SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here) 1178 << SemaRef.Context.getTypeDeclType(PrevDecl); 1179 return true; 1180 } 1181 1182 1183 // Create the class template partial specialization declaration. 1184 ClassTemplatePartialSpecializationDecl *InstPartialSpec 1185 = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, Owner, 1186 PartialSpec->getLocation(), 1187 InstParams, 1188 ClassTemplate, 1189 Converted, 1190 InstTemplateArgs.data(), 1191 InstTemplateArgs.size(), 1192 0); 1193 InstPartialSpec->setInstantiatedFromMember(PartialSpec); 1194 InstPartialSpec->setTypeAsWritten(WrittenTy); 1195 1196 // Add this partial specialization to the set of class template partial 1197 // specializations. 1198 ClassTemplate->getPartialSpecializations().InsertNode(InstPartialSpec, 1199 InsertPos); 1200 return false; 1201} 1202 1203/// \brief Does substitution on the type of the given function, including 1204/// all of the function parameters. 1205/// 1206/// \param D The function whose type will be the basis of the substitution 1207/// 1208/// \param Params the instantiated parameter declarations 1209 1210/// \returns the instantiated function's type if successful, a NULL 1211/// type if there was an error. 1212QualType 1213TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, 1214 llvm::SmallVectorImpl<ParmVarDecl *> &Params) { 1215 bool InvalidDecl = false; 1216 1217 // Substitute all of the function's formal parameter types. 1218 TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs); 1219 llvm::SmallVector<QualType, 4> ParamTys; 1220 for (FunctionDecl::param_iterator P = D->param_begin(), 1221 PEnd = D->param_end(); 1222 P != PEnd; ++P) { 1223 if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) { 1224 if (PInst->getType()->isVoidType()) { 1225 SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type); 1226 PInst->setInvalidDecl(); 1227 } else if (SemaRef.RequireNonAbstractType(PInst->getLocation(), 1228 PInst->getType(), 1229 diag::err_abstract_type_in_decl, 1230 Sema::AbstractParamType)) 1231 PInst->setInvalidDecl(); 1232 1233 Params.push_back(PInst); 1234 ParamTys.push_back(PInst->getType()); 1235 1236 if (PInst->isInvalidDecl()) 1237 InvalidDecl = true; 1238 } else 1239 InvalidDecl = true; 1240 } 1241 1242 // FIXME: Deallocate dead declarations. 1243 if (InvalidDecl) 1244 return QualType(); 1245 1246 const FunctionProtoType *Proto = D->getType()->getAs<FunctionProtoType>(); 1247 assert(Proto && "Missing prototype?"); 1248 QualType ResultType 1249 = SemaRef.SubstType(Proto->getResultType(), TemplateArgs, 1250 D->getLocation(), D->getDeclName()); 1251 if (ResultType.isNull()) 1252 return QualType(); 1253 1254 return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(), 1255 Proto->isVariadic(), Proto->getTypeQuals(), 1256 D->getLocation(), D->getDeclName()); 1257} 1258 1259/// \brief Initializes the common fields of an instantiation function 1260/// declaration (New) from the corresponding fields of its template (Tmpl). 1261/// 1262/// \returns true if there was an error 1263bool 1264TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, 1265 FunctionDecl *Tmpl) { 1266 if (Tmpl->isDeleted()) 1267 New->setDeleted(); 1268 1269 // If we are performing substituting explicitly-specified template arguments 1270 // or deduced template arguments into a function template and we reach this 1271 // point, we are now past the point where SFINAE applies and have committed 1272 // to keeping the new function template specialization. We therefore 1273 // convert the active template instantiation for the function template 1274 // into a template instantiation for this specific function template 1275 // specialization, which is not a SFINAE context, so that we diagnose any 1276 // further errors in the declaration itself. 1277 typedef Sema::ActiveTemplateInstantiation ActiveInstType; 1278 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); 1279 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || 1280 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { 1281 if (FunctionTemplateDecl *FunTmpl 1282 = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { 1283 assert(FunTmpl->getTemplatedDecl() == Tmpl && 1284 "Deduction from the wrong function template?"); 1285 (void) FunTmpl; 1286 ActiveInst.Kind = ActiveInstType::TemplateInstantiation; 1287 ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); 1288 --SemaRef.NonInstantiationEntries; 1289 } 1290 } 1291 1292 return false; 1293} 1294 1295/// \brief Initializes common fields of an instantiated method 1296/// declaration (New) from the corresponding fields of its template 1297/// (Tmpl). 1298/// 1299/// \returns true if there was an error 1300bool 1301TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, 1302 CXXMethodDecl *Tmpl) { 1303 if (InitFunctionInstantiation(New, Tmpl)) 1304 return true; 1305 1306 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 1307 New->setAccess(Tmpl->getAccess()); 1308 if (Tmpl->isVirtualAsWritten()) { 1309 New->setVirtualAsWritten(true); 1310 Record->setAggregate(false); 1311 Record->setPOD(false); 1312 Record->setEmpty(false); 1313 Record->setPolymorphic(true); 1314 } 1315 if (Tmpl->isPure()) { 1316 New->setPure(); 1317 Record->setAbstract(true); 1318 } 1319 1320 // FIXME: attributes 1321 // FIXME: New needs a pointer to Tmpl 1322 return false; 1323} 1324 1325/// \brief Instantiate the definition of the given function from its 1326/// template. 1327/// 1328/// \param PointOfInstantiation the point at which the instantiation was 1329/// required. Note that this is not precisely a "point of instantiation" 1330/// for the function, but it's close. 1331/// 1332/// \param Function the already-instantiated declaration of a 1333/// function template specialization or member function of a class template 1334/// specialization. 1335/// 1336/// \param Recursive if true, recursively instantiates any functions that 1337/// are required by this instantiation. 1338/// 1339/// \param DefinitionRequired if true, then we are performing an explicit 1340/// instantiation where the body of the function is required. Complain if 1341/// there is no such body. 1342void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, 1343 FunctionDecl *Function, 1344 bool Recursive, 1345 bool DefinitionRequired) { 1346 if (Function->isInvalidDecl()) 1347 return; 1348 1349 assert(!Function->getBody() && "Already instantiated!"); 1350 1351 // Never instantiate an explicit specialization. 1352 if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 1353 return; 1354 1355 // Find the function body that we'll be substituting. 1356 const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern(); 1357 Stmt *Pattern = 0; 1358 if (PatternDecl) 1359 Pattern = PatternDecl->getBody(PatternDecl); 1360 1361 if (!Pattern) { 1362 if (DefinitionRequired) { 1363 if (Function->getPrimaryTemplate()) 1364 Diag(PointOfInstantiation, 1365 diag::err_explicit_instantiation_undefined_func_template) 1366 << Function->getPrimaryTemplate(); 1367 else 1368 Diag(PointOfInstantiation, 1369 diag::err_explicit_instantiation_undefined_member) 1370 << 1 << Function->getDeclName() << Function->getDeclContext(); 1371 1372 if (PatternDecl) 1373 Diag(PatternDecl->getLocation(), 1374 diag::note_explicit_instantiation_here); 1375 } 1376 1377 return; 1378 } 1379 1380 // C++0x [temp.explicit]p9: 1381 // Except for inline functions, other explicit instantiation declarations 1382 // have the effect of suppressing the implicit instantiation of the entity 1383 // to which they refer. 1384 if (Function->getTemplateSpecializationKind() 1385 == TSK_ExplicitInstantiationDeclaration && 1386 !PatternDecl->isInlined()) 1387 return; 1388 1389 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); 1390 if (Inst) 1391 return; 1392 1393 // If we're performing recursive template instantiation, create our own 1394 // queue of pending implicit instantiations that we will instantiate later, 1395 // while we're still within our own instantiation context. 1396 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1397 if (Recursive) 1398 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1399 1400 ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function)); 1401 1402 // Introduce a new scope where local variable instantiations will be 1403 // recorded. 1404 LocalInstantiationScope Scope(*this); 1405 1406 // Introduce the instantiated function parameters into the local 1407 // instantiation scope. 1408 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) 1409 Scope.InstantiatedLocal(PatternDecl->getParamDecl(I), 1410 Function->getParamDecl(I)); 1411 1412 // Enter the scope of this instantiation. We don't use 1413 // PushDeclContext because we don't have a scope. 1414 DeclContext *PreviousContext = CurContext; 1415 CurContext = Function; 1416 1417 MultiLevelTemplateArgumentList TemplateArgs = 1418 getTemplateInstantiationArgs(Function); 1419 1420 // If this is a constructor, instantiate the member initializers. 1421 if (const CXXConstructorDecl *Ctor = 1422 dyn_cast<CXXConstructorDecl>(PatternDecl)) { 1423 InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor, 1424 TemplateArgs); 1425 } 1426 1427 // Instantiate the function body. 1428 OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs); 1429 1430 if (Body.isInvalid()) 1431 Function->setInvalidDecl(); 1432 1433 ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body), 1434 /*IsInstantiation=*/true); 1435 1436 CurContext = PreviousContext; 1437 1438 DeclGroupRef DG(Function); 1439 Consumer.HandleTopLevelDecl(DG); 1440 1441 if (Recursive) { 1442 // Instantiate any pending implicit instantiations found during the 1443 // instantiation of this template. 1444 PerformPendingImplicitInstantiations(); 1445 1446 // Restore the set of pending implicit instantiations. 1447 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1448 } 1449} 1450 1451/// \brief Instantiate the definition of the given variable from its 1452/// template. 1453/// 1454/// \param PointOfInstantiation the point at which the instantiation was 1455/// required. Note that this is not precisely a "point of instantiation" 1456/// for the function, but it's close. 1457/// 1458/// \param Var the already-instantiated declaration of a static member 1459/// variable of a class template specialization. 1460/// 1461/// \param Recursive if true, recursively instantiates any functions that 1462/// are required by this instantiation. 1463/// 1464/// \param DefinitionRequired if true, then we are performing an explicit 1465/// instantiation where an out-of-line definition of the member variable 1466/// is required. Complain if there is no such definition. 1467void Sema::InstantiateStaticDataMemberDefinition( 1468 SourceLocation PointOfInstantiation, 1469 VarDecl *Var, 1470 bool Recursive, 1471 bool DefinitionRequired) { 1472 if (Var->isInvalidDecl()) 1473 return; 1474 1475 // Find the out-of-line definition of this static data member. 1476 VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); 1477 assert(Def && "This data member was not instantiated from a template?"); 1478 assert(Def->isStaticDataMember() && "Not a static data member?"); 1479 Def = Def->getOutOfLineDefinition(); 1480 1481 if (!Def) { 1482 // We did not find an out-of-line definition of this static data member, 1483 // so we won't perform any instantiation. Rather, we rely on the user to 1484 // instantiate this definition (or provide a specialization for it) in 1485 // another translation unit. 1486 if (DefinitionRequired) { 1487 Def = Var->getInstantiatedFromStaticDataMember(); 1488 Diag(PointOfInstantiation, 1489 diag::err_explicit_instantiation_undefined_member) 1490 << 2 << Var->getDeclName() << Var->getDeclContext(); 1491 Diag(Def->getLocation(), diag::note_explicit_instantiation_here); 1492 } 1493 1494 return; 1495 } 1496 1497 // Never instantiate an explicit specialization. 1498 if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 1499 return; 1500 1501 // C++0x [temp.explicit]p9: 1502 // Except for inline functions, other explicit instantiation declarations 1503 // have the effect of suppressing the implicit instantiation of the entity 1504 // to which they refer. 1505 if (Var->getTemplateSpecializationKind() 1506 == TSK_ExplicitInstantiationDeclaration) 1507 return; 1508 1509 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); 1510 if (Inst) 1511 return; 1512 1513 // If we're performing recursive template instantiation, create our own 1514 // queue of pending implicit instantiations that we will instantiate later, 1515 // while we're still within our own instantiation context. 1516 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1517 if (Recursive) 1518 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1519 1520 // Enter the scope of this instantiation. We don't use 1521 // PushDeclContext because we don't have a scope. 1522 DeclContext *PreviousContext = CurContext; 1523 CurContext = Var->getDeclContext(); 1524 1525 VarDecl *OldVar = Var; 1526 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), 1527 getTemplateInstantiationArgs(Var))); 1528 CurContext = PreviousContext; 1529 1530 if (Var) { 1531 Var->setPreviousDeclaration(OldVar); 1532 MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); 1533 assert(MSInfo && "Missing member specialization information?"); 1534 Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), 1535 MSInfo->getPointOfInstantiation()); 1536 DeclGroupRef DG(Var); 1537 Consumer.HandleTopLevelDecl(DG); 1538 } 1539 1540 if (Recursive) { 1541 // Instantiate any pending implicit instantiations found during the 1542 // instantiation of this template. 1543 PerformPendingImplicitInstantiations(); 1544 1545 // Restore the set of pending implicit instantiations. 1546 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1547 } 1548} 1549 1550void 1551Sema::InstantiateMemInitializers(CXXConstructorDecl *New, 1552 const CXXConstructorDecl *Tmpl, 1553 const MultiLevelTemplateArgumentList &TemplateArgs) { 1554 1555 llvm::SmallVector<MemInitTy*, 4> NewInits; 1556 1557 // Instantiate all the initializers. 1558 for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), 1559 InitsEnd = Tmpl->init_end(); 1560 Inits != InitsEnd; ++Inits) { 1561 CXXBaseOrMemberInitializer *Init = *Inits; 1562 1563 ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this); 1564 1565 // Instantiate all the arguments. 1566 for (ExprIterator Args = Init->arg_begin(), ArgsEnd = Init->arg_end(); 1567 Args != ArgsEnd; ++Args) { 1568 OwningExprResult NewArg = SubstExpr(*Args, TemplateArgs); 1569 1570 if (NewArg.isInvalid()) 1571 New->setInvalidDecl(); 1572 else 1573 NewArgs.push_back(NewArg.takeAs<Expr>()); 1574 } 1575 1576 MemInitResult NewInit; 1577 1578 if (Init->isBaseInitializer()) { 1579 QualType BaseType(Init->getBaseClass(), 0); 1580 BaseType = SubstType(BaseType, TemplateArgs, Init->getSourceLocation(), 1581 New->getDeclName()); 1582 1583 NewInit = BuildBaseInitializer(BaseType, 1584 (Expr **)NewArgs.data(), 1585 NewArgs.size(), 1586 Init->getSourceLocation(), 1587 Init->getRParenLoc(), 1588 New->getParent()); 1589 } else if (Init->isMemberInitializer()) { 1590 FieldDecl *Member; 1591 1592 // Is this an anonymous union? 1593 if (FieldDecl *UnionInit = Init->getAnonUnionMember()) 1594 Member = cast<FieldDecl>(FindInstantiatedDecl(UnionInit, TemplateArgs)); 1595 else 1596 Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMember(), 1597 TemplateArgs)); 1598 1599 NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(), 1600 NewArgs.size(), 1601 Init->getSourceLocation(), 1602 Init->getRParenLoc()); 1603 } 1604 1605 if (NewInit.isInvalid()) 1606 New->setInvalidDecl(); 1607 else { 1608 // FIXME: It would be nice if ASTOwningVector had a release function. 1609 NewArgs.take(); 1610 1611 NewInits.push_back((MemInitTy *)NewInit.get()); 1612 } 1613 } 1614 1615 // Assign all the initializers to the new constructor. 1616 ActOnMemInitializers(DeclPtrTy::make(New), 1617 /*FIXME: ColonLoc */ 1618 SourceLocation(), 1619 NewInits.data(), NewInits.size()); 1620} 1621 1622// TODO: this could be templated if the various decl types used the 1623// same method name. 1624static bool isInstantiationOf(ClassTemplateDecl *Pattern, 1625 ClassTemplateDecl *Instance) { 1626 Pattern = Pattern->getCanonicalDecl(); 1627 1628 do { 1629 Instance = Instance->getCanonicalDecl(); 1630 if (Pattern == Instance) return true; 1631 Instance = Instance->getInstantiatedFromMemberTemplate(); 1632 } while (Instance); 1633 1634 return false; 1635} 1636 1637static bool isInstantiationOf(FunctionTemplateDecl *Pattern, 1638 FunctionTemplateDecl *Instance) { 1639 Pattern = Pattern->getCanonicalDecl(); 1640 1641 do { 1642 Instance = Instance->getCanonicalDecl(); 1643 if (Pattern == Instance) return true; 1644 Instance = Instance->getInstantiatedFromMemberTemplate(); 1645 } while (Instance); 1646 1647 return false; 1648} 1649 1650static bool 1651isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern, 1652 ClassTemplatePartialSpecializationDecl *Instance) { 1653 Pattern 1654 = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl()); 1655 do { 1656 Instance = cast<ClassTemplatePartialSpecializationDecl>( 1657 Instance->getCanonicalDecl()); 1658 if (Pattern == Instance) 1659 return true; 1660 Instance = Instance->getInstantiatedFromMember(); 1661 } while (Instance); 1662 1663 return false; 1664} 1665 1666static bool isInstantiationOf(CXXRecordDecl *Pattern, 1667 CXXRecordDecl *Instance) { 1668 Pattern = Pattern->getCanonicalDecl(); 1669 1670 do { 1671 Instance = Instance->getCanonicalDecl(); 1672 if (Pattern == Instance) return true; 1673 Instance = Instance->getInstantiatedFromMemberClass(); 1674 } while (Instance); 1675 1676 return false; 1677} 1678 1679static bool isInstantiationOf(FunctionDecl *Pattern, 1680 FunctionDecl *Instance) { 1681 Pattern = Pattern->getCanonicalDecl(); 1682 1683 do { 1684 Instance = Instance->getCanonicalDecl(); 1685 if (Pattern == Instance) return true; 1686 Instance = Instance->getInstantiatedFromMemberFunction(); 1687 } while (Instance); 1688 1689 return false; 1690} 1691 1692static bool isInstantiationOf(EnumDecl *Pattern, 1693 EnumDecl *Instance) { 1694 Pattern = Pattern->getCanonicalDecl(); 1695 1696 do { 1697 Instance = Instance->getCanonicalDecl(); 1698 if (Pattern == Instance) return true; 1699 Instance = Instance->getInstantiatedFromMemberEnum(); 1700 } while (Instance); 1701 1702 return false; 1703} 1704 1705static bool isInstantiationOf(UnresolvedUsingDecl *Pattern, 1706 UsingDecl *Instance, 1707 ASTContext &C) { 1708 return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern; 1709} 1710 1711static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, 1712 VarDecl *Instance) { 1713 assert(Instance->isStaticDataMember()); 1714 1715 Pattern = Pattern->getCanonicalDecl(); 1716 1717 do { 1718 Instance = Instance->getCanonicalDecl(); 1719 if (Pattern == Instance) return true; 1720 Instance = Instance->getInstantiatedFromStaticDataMember(); 1721 } while (Instance); 1722 1723 return false; 1724} 1725 1726static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { 1727 if (D->getKind() != Other->getKind()) { 1728 if (UnresolvedUsingDecl *UUD = dyn_cast<UnresolvedUsingDecl>(D)) { 1729 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 1730 return isInstantiationOf(UUD, UD, Ctx); 1731 } 1732 } 1733 1734 return false; 1735 } 1736 1737 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other)) 1738 return isInstantiationOf(cast<CXXRecordDecl>(D), Record); 1739 1740 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other)) 1741 return isInstantiationOf(cast<FunctionDecl>(D), Function); 1742 1743 if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other)) 1744 return isInstantiationOf(cast<EnumDecl>(D), Enum); 1745 1746 if (VarDecl *Var = dyn_cast<VarDecl>(Other)) 1747 if (Var->isStaticDataMember()) 1748 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var); 1749 1750 if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other)) 1751 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp); 1752 1753 if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other)) 1754 return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp); 1755 1756 if (ClassTemplatePartialSpecializationDecl *PartialSpec 1757 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Other)) 1758 return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D), 1759 PartialSpec); 1760 1761 if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) { 1762 if (!Field->getDeclName()) { 1763 // This is an unnamed field. 1764 return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == 1765 cast<FieldDecl>(D); 1766 } 1767 } 1768 1769 return D->getDeclName() && isa<NamedDecl>(Other) && 1770 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName(); 1771} 1772 1773template<typename ForwardIterator> 1774static NamedDecl *findInstantiationOf(ASTContext &Ctx, 1775 NamedDecl *D, 1776 ForwardIterator first, 1777 ForwardIterator last) { 1778 for (; first != last; ++first) 1779 if (isInstantiationOf(Ctx, D, *first)) 1780 return cast<NamedDecl>(*first); 1781 1782 return 0; 1783} 1784 1785/// \brief Finds the instantiation of the given declaration context 1786/// within the current instantiation. 1787/// 1788/// \returns NULL if there was an error 1789DeclContext *Sema::FindInstantiatedContext(DeclContext* DC, 1790 const MultiLevelTemplateArgumentList &TemplateArgs) { 1791 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) { 1792 Decl* ID = FindInstantiatedDecl(D, TemplateArgs); 1793 return cast_or_null<DeclContext>(ID); 1794 } else return DC; 1795} 1796 1797/// \brief Find the instantiation of the given declaration within the 1798/// current instantiation. 1799/// 1800/// This routine is intended to be used when \p D is a declaration 1801/// referenced from within a template, that needs to mapped into the 1802/// corresponding declaration within an instantiation. For example, 1803/// given: 1804/// 1805/// \code 1806/// template<typename T> 1807/// struct X { 1808/// enum Kind { 1809/// KnownValue = sizeof(T) 1810/// }; 1811/// 1812/// bool getKind() const { return KnownValue; } 1813/// }; 1814/// 1815/// template struct X<int>; 1816/// \endcode 1817/// 1818/// In the instantiation of X<int>::getKind(), we need to map the 1819/// EnumConstantDecl for KnownValue (which refers to 1820/// X<T>::<Kind>::KnownValue) to its instantiation 1821/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs 1822/// this mapping from within the instantiation of X<int>. 1823NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D, 1824 const MultiLevelTemplateArgumentList &TemplateArgs) { 1825 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) { 1826 // Transform all of the elements of the overloaded function set. 1827 OverloadedFunctionDecl *Result 1828 = OverloadedFunctionDecl::Create(Context, CurContext, Ovl->getDeclName()); 1829 1830 for (OverloadedFunctionDecl::function_iterator F = Ovl->function_begin(), 1831 FEnd = Ovl->function_end(); 1832 F != FEnd; ++F) { 1833 Result->addOverload( 1834 AnyFunctionDecl::getFromNamedDecl(FindInstantiatedDecl(*F, 1835 TemplateArgs))); 1836 } 1837 1838 return Result; 1839 } 1840 1841 DeclContext *ParentDC = D->getDeclContext(); 1842 if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) || 1843 isa<TemplateTypeParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || 1844 ParentDC->isFunctionOrMethod()) { 1845 // D is a local of some kind. Look into the map of local 1846 // declarations to their instantiations. 1847 return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D)); 1848 } 1849 1850 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { 1851 if (!Record->isDependentContext()) 1852 return D; 1853 1854 // If the RecordDecl is actually the injected-class-name or a "templated" 1855 // declaration for a class template or class template partial 1856 // specialization, substitute into the injected-class-name of the 1857 // class template or partial specialization to find the new DeclContext. 1858 QualType T; 1859 ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate(); 1860 1861 if (ClassTemplate) { 1862 T = ClassTemplate->getInjectedClassNameType(Context); 1863 } else if (ClassTemplatePartialSpecializationDecl *PartialSpec 1864 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { 1865 T = Context.getTypeDeclType(Record); 1866 ClassTemplate = PartialSpec->getSpecializedTemplate(); 1867 } 1868 1869 if (!T.isNull()) { 1870 // Substitute into the injected-class-name to get the type corresponding 1871 // to the instantiation we want. This substitution should never fail, 1872 // since we know we can instantiate the injected-class-name or we wouldn't 1873 // have gotten to the injected-class-name! 1874 // FIXME: Can we use the CurrentInstantiationScope to avoid this extra 1875 // instantiation in the common case? 1876 T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName()); 1877 assert(!T.isNull() && "Instantiation of injected-class-name cannot fail."); 1878 1879 if (!T->isDependentType()) { 1880 assert(T->isRecordType() && "Instantiation must produce a record type"); 1881 return T->getAs<RecordType>()->getDecl(); 1882 } 1883 1884 // We are performing "partial" template instantiation to create the 1885 // member declarations for the members of a class template 1886 // specialization. Therefore, D is actually referring to something in 1887 // the current instantiation. Look through the current context, 1888 // which contains actual instantiations, to find the instantiation of 1889 // the "current instantiation" that D refers to. 1890 for (DeclContext *DC = CurContext; !DC->isFileContext(); 1891 DC = DC->getParent()) { 1892 if (ClassTemplateSpecializationDecl *Spec 1893 = dyn_cast<ClassTemplateSpecializationDecl>(DC)) 1894 if (isInstantiationOf(ClassTemplate, 1895 Spec->getSpecializedTemplate())) 1896 return Spec; 1897 } 1898 1899 assert(false && 1900 "Unable to find declaration for the current instantiation"); 1901 return Record; 1902 } 1903 1904 // Fall through to deal with other dependent record types (e.g., 1905 // anonymous unions in class templates). 1906 } 1907 1908 if (!ParentDC->isDependentContext()) 1909 return D; 1910 1911 ParentDC = FindInstantiatedContext(ParentDC, TemplateArgs); 1912 if (!ParentDC) 1913 return 0; 1914 1915 if (ParentDC != D->getDeclContext()) { 1916 // We performed some kind of instantiation in the parent context, 1917 // so now we need to look into the instantiated parent context to 1918 // find the instantiation of the declaration D. 1919 NamedDecl *Result = 0; 1920 if (D->getDeclName()) { 1921 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); 1922 Result = findInstantiationOf(Context, D, Found.first, Found.second); 1923 } else { 1924 // Since we don't have a name for the entity we're looking for, 1925 // our only option is to walk through all of the declarations to 1926 // find that name. This will occur in a few cases: 1927 // 1928 // - anonymous struct/union within a template 1929 // - unnamed class/struct/union/enum within a template 1930 // 1931 // FIXME: Find a better way to find these instantiations! 1932 Result = findInstantiationOf(Context, D, 1933 ParentDC->decls_begin(), 1934 ParentDC->decls_end()); 1935 } 1936 1937 assert(Result && "Unable to find instantiation of declaration!"); 1938 D = Result; 1939 } 1940 1941 return D; 1942} 1943 1944/// \brief Performs template instantiation for all implicit template 1945/// instantiations we have seen until this point. 1946void Sema::PerformPendingImplicitInstantiations() { 1947 while (!PendingImplicitInstantiations.empty()) { 1948 PendingImplicitInstantiation Inst = PendingImplicitInstantiations.front(); 1949 PendingImplicitInstantiations.pop_front(); 1950 1951 // Instantiate function definitions 1952 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) { 1953 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function), 1954 Function->getLocation(), *this, 1955 Context.getSourceManager(), 1956 "instantiating function definition"); 1957 1958 if (!Function->getBody()) 1959 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true); 1960 continue; 1961 } 1962 1963 // Instantiate static data member definitions. 1964 VarDecl *Var = cast<VarDecl>(Inst.first); 1965 assert(Var->isStaticDataMember() && "Not a static data member?"); 1966 1967 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var), 1968 Var->getLocation(), *this, 1969 Context.getSourceManager(), 1970 "instantiating static data member " 1971 "definition"); 1972 1973 InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true); 1974 } 1975} 1976