SemaTemplateInstantiateDecl.cpp revision 4ba3136b3eb9740a07bd61d0ab23ce9a8d894dee
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 "Lookup.h" 14#include "clang/AST/ASTConsumer.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclTemplate.h" 17#include "clang/AST/DeclVisitor.h" 18#include "clang/AST/Expr.h" 19#include "clang/Basic/PrettyStackTrace.h" 20#include "clang/Lex/Preprocessor.h" 21 22using namespace clang; 23 24namespace { 25 class 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 *VisitUsingDirectiveDecl(UsingDirectiveDecl *D); 69 Decl *VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D); 70 Decl *VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D); 71 72 // Base case. FIXME: Remove once we can instantiate everything. 73 Decl *VisitDecl(Decl *D) { 74 unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID( 75 Diagnostic::Error, 76 "cannot instantiate %0 yet"); 77 SemaRef.Diag(D->getLocation(), DiagID) 78 << D->getDeclKindName(); 79 80 return 0; 81 } 82 83 const LangOptions &getLangOptions() { 84 return SemaRef.getLangOptions(); 85 } 86 87 // Helper functions for instantiating methods. 88 QualType SubstFunctionType(FunctionDecl *D, 89 llvm::SmallVectorImpl<ParmVarDecl *> &Params); 90 bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl); 91 bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl); 92 93 TemplateParameterList * 94 SubstTemplateParams(TemplateParameterList *List); 95 96 bool InstantiateClassTemplatePartialSpecialization( 97 ClassTemplateDecl *ClassTemplate, 98 ClassTemplatePartialSpecializationDecl *PartialSpec); 99 }; 100} 101 102// FIXME: Is this too simple? 103void TemplateDeclInstantiator::InstantiateAttrs(Decl *Tmpl, Decl *New) { 104 for (const Attr *TmplAttr = Tmpl->getAttrs(); TmplAttr; 105 TmplAttr = TmplAttr->getNext()) { 106 107 // FIXME: Is cloning correct for all attributes? 108 Attr *NewAttr = TmplAttr->clone(SemaRef.Context); 109 110 New->addAttr(NewAttr); 111 } 112} 113 114Decl * 115TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { 116 assert(false && "Translation units cannot be instantiated"); 117 return D; 118} 119 120Decl * 121TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { 122 assert(false && "Namespaces cannot be instantiated"); 123 return D; 124} 125 126Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { 127 bool Invalid = false; 128 DeclaratorInfo *DI = D->getTypeDeclaratorInfo(); 129 if (DI->getType()->isDependentType()) { 130 DI = SemaRef.SubstType(DI, TemplateArgs, 131 D->getLocation(), D->getDeclName()); 132 if (!DI) { 133 Invalid = true; 134 DI = SemaRef.Context.getTrivialDeclaratorInfo(SemaRef.Context.IntTy); 135 } 136 } 137 138 // Create the new typedef 139 TypedefDecl *Typedef 140 = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(), 141 D->getIdentifier(), DI); 142 if (Invalid) 143 Typedef->setInvalidDecl(); 144 145 Owner->addDecl(Typedef); 146 147 return Typedef; 148} 149 150Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { 151 // Do substitution on the type of the declaration 152 DeclaratorInfo *DI = SemaRef.SubstType(D->getDeclaratorInfo(), 153 TemplateArgs, 154 D->getTypeSpecStartLoc(), 155 D->getDeclName()); 156 if (!DI) 157 return 0; 158 159 // Build the instantiated declaration 160 VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, 161 D->getLocation(), D->getIdentifier(), 162 DI->getType(), DI, 163 D->getStorageClass()); 164 Var->setThreadSpecified(D->isThreadSpecified()); 165 Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); 166 Var->setDeclaredInCondition(D->isDeclaredInCondition()); 167 168 // If we are instantiating a static data member defined 169 // out-of-line, the instantiation will have the same lexical 170 // context (which will be a namespace scope) as the template. 171 if (D->isOutOfLine()) 172 Var->setLexicalDeclContext(D->getLexicalDeclContext()); 173 174 // FIXME: In theory, we could have a previous declaration for variables that 175 // are not static data members. 176 bool Redeclaration = false; 177 // FIXME: having to fake up a LookupResult is dumb. 178 LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(), 179 Sema::LookupOrdinaryName); 180 SemaRef.CheckVariableDeclaration(Var, Previous, Redeclaration); 181 182 if (D->isOutOfLine()) { 183 D->getLexicalDeclContext()->addDecl(Var); 184 Owner->makeDeclVisibleInContext(Var); 185 } else { 186 Owner->addDecl(Var); 187 } 188 189 // Link instantiations of static data members back to the template from 190 // which they were instantiated. 191 if (Var->isStaticDataMember()) 192 SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D, 193 TSK_ImplicitInstantiation); 194 195 if (D->getInit()) { 196 OwningExprResult Init 197 = SemaRef.SubstExpr(D->getInit(), TemplateArgs); 198 if (Init.isInvalid()) 199 Var->setInvalidDecl(); 200 else if (!D->getType()->isDependentType() && 201 !D->getInit()->isTypeDependent() && 202 !D->getInit()->isValueDependent()) { 203 // If neither the declaration's type nor its initializer are dependent, 204 // we don't want to redo all the checking, especially since the 205 // initializer might have been wrapped by a CXXConstructExpr since we did 206 // it the first time. 207 Var->setType(D->getType()); 208 Var->setInit(SemaRef.Context, Init.takeAs<Expr>()); 209 } 210 else if (ParenListExpr *PLE = dyn_cast<ParenListExpr>((Expr *)Init.get())) { 211 // FIXME: We're faking all of the comma locations, which is suboptimal. 212 // Do we even need these comma locations? 213 llvm::SmallVector<SourceLocation, 4> FakeCommaLocs; 214 if (PLE->getNumExprs() > 0) { 215 FakeCommaLocs.reserve(PLE->getNumExprs() - 1); 216 for (unsigned I = 0, N = PLE->getNumExprs() - 1; I != N; ++I) { 217 Expr *E = PLE->getExpr(I)->Retain(); 218 FakeCommaLocs.push_back( 219 SemaRef.PP.getLocForEndOfToken(E->getLocEnd())); 220 } 221 PLE->getExpr(PLE->getNumExprs() - 1)->Retain(); 222 } 223 224 // Add the direct initializer to the declaration. 225 SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var), 226 PLE->getLParenLoc(), 227 Sema::MultiExprArg(SemaRef, 228 (void**)PLE->getExprs(), 229 PLE->getNumExprs()), 230 FakeCommaLocs.data(), 231 PLE->getRParenLoc()); 232 233 // When Init is destroyed, it will destroy the instantiated ParenListExpr; 234 // we've explicitly retained all of its subexpressions already. 235 } else 236 SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init), 237 D->hasCXXDirectInitializer()); 238 } else if (!Var->isStaticDataMember() || Var->isOutOfLine()) 239 SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false); 240 241 return Var; 242} 243 244Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { 245 bool Invalid = false; 246 DeclaratorInfo *DI = D->getDeclaratorInfo(); 247 if (DI->getType()->isDependentType()) { 248 DI = SemaRef.SubstType(DI, TemplateArgs, 249 D->getLocation(), D->getDeclName()); 250 if (!DI) { 251 DI = D->getDeclaratorInfo(); 252 Invalid = true; 253 } else if (DI->getType()->isFunctionType()) { 254 // C++ [temp.arg.type]p3: 255 // If a declaration acquires a function type through a type 256 // dependent on a template-parameter and this causes a 257 // declaration that does not use the syntactic form of a 258 // function declarator to have function type, the program is 259 // ill-formed. 260 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) 261 << DI->getType(); 262 Invalid = true; 263 } 264 } 265 266 Expr *BitWidth = D->getBitWidth(); 267 if (Invalid) 268 BitWidth = 0; 269 else if (BitWidth) { 270 // The bit-width expression is not potentially evaluated. 271 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 272 273 OwningExprResult InstantiatedBitWidth 274 = SemaRef.SubstExpr(BitWidth, TemplateArgs); 275 if (InstantiatedBitWidth.isInvalid()) { 276 Invalid = true; 277 BitWidth = 0; 278 } else 279 BitWidth = InstantiatedBitWidth.takeAs<Expr>(); 280 } 281 282 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), 283 DI->getType(), DI, 284 cast<RecordDecl>(Owner), 285 D->getLocation(), 286 D->isMutable(), 287 BitWidth, 288 D->getTypeSpecStartLoc(), 289 D->getAccess(), 290 0); 291 if (!Field) { 292 cast<Decl>(Owner)->setInvalidDecl(); 293 return 0; 294 } 295 296 InstantiateAttrs(D, Field); 297 298 if (Invalid) 299 Field->setInvalidDecl(); 300 301 if (!Field->getDeclName()) { 302 // Keep track of where this decl came from. 303 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); 304 } 305 306 Field->setImplicit(D->isImplicit()); 307 Owner->addDecl(Field); 308 309 return Field; 310} 311 312Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { 313 FriendDecl::FriendUnion FU; 314 315 // Handle friend type expressions by simply substituting template 316 // parameters into the pattern type. 317 if (Type *Ty = D->getFriendType()) { 318 QualType T = SemaRef.SubstType(QualType(Ty,0), TemplateArgs, 319 D->getLocation(), DeclarationName()); 320 if (T.isNull()) return 0; 321 322 assert(getLangOptions().CPlusPlus0x || T->isRecordType()); 323 FU = T.getTypePtr(); 324 325 // Handle everything else by appropriate substitution. 326 } else { 327 NamedDecl *ND = D->getFriendDecl(); 328 assert(ND && "friend decl must be a decl or a type!"); 329 330 // FIXME: We have a problem here, because the nested call to Visit(ND) 331 // will inject the thing that the friend references into the current 332 // owner, which is wrong. 333 Decl *NewND = Visit(ND); 334 if (!NewND) return 0; 335 336 FU = cast<NamedDecl>(NewND); 337 } 338 339 FriendDecl *FD = 340 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), FU, 341 D->getFriendLoc()); 342 FD->setAccess(AS_public); 343 Owner->addDecl(FD); 344 return FD; 345} 346 347Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { 348 Expr *AssertExpr = D->getAssertExpr(); 349 350 // The expression in a static assertion is not potentially evaluated. 351 EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); 352 353 OwningExprResult InstantiatedAssertExpr 354 = SemaRef.SubstExpr(AssertExpr, TemplateArgs); 355 if (InstantiatedAssertExpr.isInvalid()) 356 return 0; 357 358 OwningExprResult Message(SemaRef, D->getMessage()); 359 D->getMessage()->Retain(); 360 Decl *StaticAssert 361 = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), 362 move(InstantiatedAssertExpr), 363 move(Message)).getAs<Decl>(); 364 return StaticAssert; 365} 366 367Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { 368 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, 369 D->getLocation(), D->getIdentifier(), 370 D->getTagKeywordLoc(), 371 /*PrevDecl=*/0); 372 Enum->setInstantiationOfMemberEnum(D); 373 Enum->setAccess(D->getAccess()); 374 Owner->addDecl(Enum); 375 Enum->startDefinition(); 376 377 llvm::SmallVector<Sema::DeclPtrTy, 4> Enumerators; 378 379 EnumConstantDecl *LastEnumConst = 0; 380 for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), 381 ECEnd = D->enumerator_end(); 382 EC != ECEnd; ++EC) { 383 // The specified value for the enumerator. 384 OwningExprResult Value = SemaRef.Owned((Expr *)0); 385 if (Expr *UninstValue = EC->getInitExpr()) { 386 // The enumerator's value expression is not potentially evaluated. 387 EnterExpressionEvaluationContext Unevaluated(SemaRef, 388 Action::Unevaluated); 389 390 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); 391 } 392 393 // Drop the initial value and continue. 394 bool isInvalid = false; 395 if (Value.isInvalid()) { 396 Value = SemaRef.Owned((Expr *)0); 397 isInvalid = true; 398 } 399 400 EnumConstantDecl *EnumConst 401 = SemaRef.CheckEnumConstant(Enum, LastEnumConst, 402 EC->getLocation(), EC->getIdentifier(), 403 move(Value)); 404 405 if (isInvalid) { 406 if (EnumConst) 407 EnumConst->setInvalidDecl(); 408 Enum->setInvalidDecl(); 409 } 410 411 if (EnumConst) { 412 Enum->addDecl(EnumConst); 413 Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst)); 414 LastEnumConst = EnumConst; 415 } 416 } 417 418 // FIXME: Fixup LBraceLoc and RBraceLoc 419 // FIXME: Empty Scope and AttributeList (required to handle attribute packed). 420 SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), 421 Sema::DeclPtrTy::make(Enum), 422 &Enumerators[0], Enumerators.size(), 423 0, 0); 424 425 return Enum; 426} 427 428Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { 429 assert(false && "EnumConstantDecls can only occur within EnumDecls."); 430 return 0; 431} 432 433namespace { 434 class SortDeclByLocation { 435 SourceManager &SourceMgr; 436 437 public: 438 explicit SortDeclByLocation(SourceManager &SourceMgr) 439 : SourceMgr(SourceMgr) { } 440 441 bool operator()(const Decl *X, const Decl *Y) const { 442 return SourceMgr.isBeforeInTranslationUnit(X->getLocation(), 443 Y->getLocation()); 444 } 445 }; 446} 447 448Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { 449 // Create a local instantiation scope for this class template, which 450 // will contain the instantiations of the template parameters. 451 Sema::LocalInstantiationScope Scope(SemaRef); 452 TemplateParameterList *TempParams = D->getTemplateParameters(); 453 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 454 if (!InstParams) 455 return NULL; 456 457 CXXRecordDecl *Pattern = D->getTemplatedDecl(); 458 CXXRecordDecl *RecordInst 459 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), Owner, 460 Pattern->getLocation(), Pattern->getIdentifier(), 461 Pattern->getTagKeywordLoc(), /*PrevDecl=*/ NULL, 462 /*DelayTypeCreation=*/true); 463 464 ClassTemplateDecl *Inst 465 = ClassTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(), 466 D->getIdentifier(), InstParams, RecordInst, 0); 467 RecordInst->setDescribedClassTemplate(Inst); 468 if (D->getFriendObjectKind()) 469 Inst->setObjectOfFriendDecl(true); 470 else 471 Inst->setAccess(D->getAccess()); 472 Inst->setInstantiatedFromMemberTemplate(D); 473 474 // Trigger creation of the type for the instantiation. 475 SemaRef.Context.getTypeDeclType(RecordInst); 476 477 // Finish handling of friends. 478 if (Inst->getFriendObjectKind()) { 479 return Inst; 480 } 481 482 Owner->addDecl(Inst); 483 484 // First, we sort the partial specializations by location, so 485 // that we instantiate them in the order they were declared. 486 llvm::SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 487 for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator 488 P = D->getPartialSpecializations().begin(), 489 PEnd = D->getPartialSpecializations().end(); 490 P != PEnd; ++P) 491 PartialSpecs.push_back(&*P); 492 std::sort(PartialSpecs.begin(), PartialSpecs.end(), 493 SortDeclByLocation(SemaRef.SourceMgr)); 494 495 // Instantiate all of the partial specializations of this member class 496 // template. 497 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) 498 InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]); 499 500 return Inst; 501} 502 503Decl * 504TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( 505 ClassTemplatePartialSpecializationDecl *D) { 506 ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); 507 508 // Lookup the already-instantiated declaration in the instantiation 509 // of the class template and return that. 510 DeclContext::lookup_result Found 511 = Owner->lookup(ClassTemplate->getDeclName()); 512 if (Found.first == Found.second) 513 return 0; 514 515 ClassTemplateDecl *InstClassTemplate 516 = dyn_cast<ClassTemplateDecl>(*Found.first); 517 if (!InstClassTemplate) 518 return 0; 519 520 Decl *DCanon = D->getCanonicalDecl(); 521 for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator 522 P = InstClassTemplate->getPartialSpecializations().begin(), 523 PEnd = InstClassTemplate->getPartialSpecializations().end(); 524 P != PEnd; ++P) { 525 if (P->getInstantiatedFromMember()->getCanonicalDecl() == DCanon) 526 return &*P; 527 } 528 529 return 0; 530} 531 532Decl * 533TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { 534 // Create a local instantiation scope for this function template, which 535 // will contain the instantiations of the template parameters and then get 536 // merged with the local instantiation scope for the function template 537 // itself. 538 Sema::LocalInstantiationScope Scope(SemaRef); 539 540 TemplateParameterList *TempParams = D->getTemplateParameters(); 541 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 542 if (!InstParams) 543 return NULL; 544 545 FunctionDecl *Instantiated = 0; 546 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl())) 547 Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod, 548 InstParams)); 549 else 550 Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl( 551 D->getTemplatedDecl(), 552 InstParams)); 553 554 if (!Instantiated) 555 return 0; 556 557 // Link the instantiated function template declaration to the function 558 // template from which it was instantiated. 559 FunctionTemplateDecl *InstTemplate 560 = Instantiated->getDescribedFunctionTemplate(); 561 InstTemplate->setAccess(D->getAccess()); 562 assert(InstTemplate && 563 "VisitFunctionDecl/CXXMethodDecl didn't create a template!"); 564 if (!InstTemplate->getInstantiatedFromMemberTemplate()) 565 InstTemplate->setInstantiatedFromMemberTemplate(D); 566 567 // Add non-friends into the owner. 568 if (!InstTemplate->getFriendObjectKind()) 569 Owner->addDecl(InstTemplate); 570 return InstTemplate; 571} 572 573Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { 574 CXXRecordDecl *PrevDecl = 0; 575 if (D->isInjectedClassName()) 576 PrevDecl = cast<CXXRecordDecl>(Owner); 577 578 CXXRecordDecl *Record 579 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, 580 D->getLocation(), D->getIdentifier(), 581 D->getTagKeywordLoc(), PrevDecl); 582 Record->setImplicit(D->isImplicit()); 583 // FIXME: Check against AS_none is an ugly hack to work around the issue that 584 // the tag decls introduced by friend class declarations don't have an access 585 // specifier. Remove once this area of the code gets sorted out. 586 if (D->getAccess() != AS_none) 587 Record->setAccess(D->getAccess()); 588 if (!D->isInjectedClassName()) 589 Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); 590 591 // If the original function was part of a friend declaration, 592 // inherit its namespace state. 593 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) 594 Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); 595 596 Record->setAnonymousStructOrUnion(D->isAnonymousStructOrUnion()); 597 598 Owner->addDecl(Record); 599 return Record; 600} 601 602/// Normal class members are of more specific types and therefore 603/// don't make it here. This function serves two purposes: 604/// 1) instantiating function templates 605/// 2) substituting friend declarations 606/// FIXME: preserve function definitions in case #2 607 Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, 608 TemplateParameterList *TemplateParams) { 609 // Check whether there is already a function template specialization for 610 // this declaration. 611 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 612 void *InsertPos = 0; 613 if (FunctionTemplate && !TemplateParams) { 614 llvm::FoldingSetNodeID ID; 615 FunctionTemplateSpecializationInfo::Profile(ID, 616 TemplateArgs.getInnermost().getFlatArgumentList(), 617 TemplateArgs.getInnermost().flat_size(), 618 SemaRef.Context); 619 620 FunctionTemplateSpecializationInfo *Info 621 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 622 InsertPos); 623 624 // If we already have a function template specialization, return it. 625 if (Info) 626 return Info->Function; 627 } 628 629 Sema::LocalInstantiationScope Scope(SemaRef, TemplateParams != 0); 630 631 llvm::SmallVector<ParmVarDecl *, 4> Params; 632 QualType T = SubstFunctionType(D, Params); 633 if (T.isNull()) 634 return 0; 635 636 // Build the instantiated method declaration. 637 DeclContext *DC = SemaRef.FindInstantiatedContext(D->getDeclContext(), 638 TemplateArgs); 639 FunctionDecl *Function = 640 FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(), 641 D->getDeclName(), T, D->getDeclaratorInfo(), 642 D->getStorageClass(), 643 D->isInlineSpecified(), D->hasWrittenPrototype()); 644 Function->setLexicalDeclContext(Owner); 645 646 // Attach the parameters 647 for (unsigned P = 0; P < Params.size(); ++P) 648 Params[P]->setOwningFunction(Function); 649 Function->setParams(SemaRef.Context, Params.data(), Params.size()); 650 651 if (TemplateParams) { 652 // Our resulting instantiation is actually a function template, since we 653 // are substituting only the outer template parameters. For example, given 654 // 655 // template<typename T> 656 // struct X { 657 // template<typename U> friend void f(T, U); 658 // }; 659 // 660 // X<int> x; 661 // 662 // We are instantiating the friend function template "f" within X<int>, 663 // which means substituting int for T, but leaving "f" as a friend function 664 // template. 665 // Build the function template itself. 666 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Owner, 667 Function->getLocation(), 668 Function->getDeclName(), 669 TemplateParams, Function); 670 Function->setDescribedFunctionTemplate(FunctionTemplate); 671 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 672 } else if (FunctionTemplate) { 673 // Record this function template specialization. 674 Function->setFunctionTemplateSpecialization(SemaRef.Context, 675 FunctionTemplate, 676 &TemplateArgs.getInnermost(), 677 InsertPos); 678 } 679 680 if (InitFunctionInstantiation(Function, D)) 681 Function->setInvalidDecl(); 682 683 bool Redeclaration = false; 684 bool OverloadableAttrRequired = false; 685 686 LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(), 687 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 688 689 if (TemplateParams || !FunctionTemplate) { 690 // Look only into the namespace where the friend would be declared to 691 // find a previous declaration. This is the innermost enclosing namespace, 692 // as described in ActOnFriendFunctionDecl. 693 SemaRef.LookupQualifiedName(Previous, DC); 694 695 // In C++, the previous declaration we find might be a tag type 696 // (class or enum). In this case, the new declaration will hide the 697 // tag type. Note that this does does not apply if we're declaring a 698 // typedef (C++ [dcl.typedef]p4). 699 if (Previous.isSingleTagDecl()) 700 Previous.clear(); 701 } 702 703 SemaRef.CheckFunctionDeclaration(Function, Previous, false, Redeclaration, 704 /*FIXME:*/OverloadableAttrRequired); 705 706 // If the original function was part of a friend declaration, 707 // inherit its namespace state and add it to the owner. 708 NamedDecl *FromFriendD 709 = TemplateParams? cast<NamedDecl>(D->getDescribedFunctionTemplate()) : D; 710 if (FromFriendD->getFriendObjectKind()) { 711 NamedDecl *ToFriendD = 0; 712 NamedDecl *PrevDecl; 713 if (TemplateParams) { 714 ToFriendD = cast<NamedDecl>(FunctionTemplate); 715 PrevDecl = FunctionTemplate->getPreviousDeclaration(); 716 } else { 717 ToFriendD = Function; 718 PrevDecl = Function->getPreviousDeclaration(); 719 } 720 ToFriendD->setObjectOfFriendDecl(PrevDecl != NULL); 721 if (!Owner->isDependentContext() && !PrevDecl) 722 DC->makeDeclVisibleInContext(ToFriendD, /* Recoverable = */ false); 723 724 if (!TemplateParams) 725 Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 726 } 727 728 return Function; 729} 730 731Decl * 732TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, 733 TemplateParameterList *TemplateParams) { 734 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 735 void *InsertPos = 0; 736 if (FunctionTemplate && !TemplateParams) { 737 // We are creating a function template specialization from a function 738 // template. Check whether there is already a function template 739 // specialization for this particular set of template arguments. 740 llvm::FoldingSetNodeID ID; 741 FunctionTemplateSpecializationInfo::Profile(ID, 742 TemplateArgs.getInnermost().getFlatArgumentList(), 743 TemplateArgs.getInnermost().flat_size(), 744 SemaRef.Context); 745 746 FunctionTemplateSpecializationInfo *Info 747 = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, 748 InsertPos); 749 750 // If we already have a function template specialization, return it. 751 if (Info) 752 return Info->Function; 753 } 754 755 Sema::LocalInstantiationScope Scope(SemaRef, TemplateParams != 0); 756 757 llvm::SmallVector<ParmVarDecl *, 4> Params; 758 QualType T = SubstFunctionType(D, Params); 759 if (T.isNull()) 760 return 0; 761 762 // Build the instantiated method declaration. 763 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 764 CXXMethodDecl *Method = 0; 765 766 DeclarationName Name = D->getDeclName(); 767 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 768 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 769 Name = SemaRef.Context.DeclarationNames.getCXXConstructorName( 770 SemaRef.Context.getCanonicalType(ClassTy)); 771 Method = CXXConstructorDecl::Create(SemaRef.Context, Record, 772 Constructor->getLocation(), 773 Name, T, 774 Constructor->getDeclaratorInfo(), 775 Constructor->isExplicit(), 776 Constructor->isInlineSpecified(), false); 777 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 778 QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); 779 Name = SemaRef.Context.DeclarationNames.getCXXDestructorName( 780 SemaRef.Context.getCanonicalType(ClassTy)); 781 Method = CXXDestructorDecl::Create(SemaRef.Context, Record, 782 Destructor->getLocation(), Name, 783 T, Destructor->isInlineSpecified(), false); 784 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) { 785 CanQualType ConvTy 786 = SemaRef.Context.getCanonicalType( 787 T->getAs<FunctionType>()->getResultType()); 788 Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName( 789 ConvTy); 790 Method = CXXConversionDecl::Create(SemaRef.Context, Record, 791 Conversion->getLocation(), Name, 792 T, Conversion->getDeclaratorInfo(), 793 Conversion->isInlineSpecified(), 794 Conversion->isExplicit()); 795 } else { 796 Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(), 797 D->getDeclName(), T, D->getDeclaratorInfo(), 798 D->isStatic(), D->isInlineSpecified()); 799 } 800 801 if (TemplateParams) { 802 // Our resulting instantiation is actually a function template, since we 803 // are substituting only the outer template parameters. For example, given 804 // 805 // template<typename T> 806 // struct X { 807 // template<typename U> void f(T, U); 808 // }; 809 // 810 // X<int> x; 811 // 812 // We are instantiating the member template "f" within X<int>, which means 813 // substituting int for T, but leaving "f" as a member function template. 814 // Build the function template itself. 815 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, 816 Method->getLocation(), 817 Method->getDeclName(), 818 TemplateParams, Method); 819 if (D->isOutOfLine()) 820 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 821 Method->setDescribedFunctionTemplate(FunctionTemplate); 822 } else if (FunctionTemplate) { 823 // Record this function template specialization. 824 Method->setFunctionTemplateSpecialization(SemaRef.Context, 825 FunctionTemplate, 826 &TemplateArgs.getInnermost(), 827 InsertPos); 828 } else { 829 // Record that this is an instantiation of a member function. 830 Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 831 } 832 833 // If we are instantiating a member function defined 834 // out-of-line, the instantiation will have the same lexical 835 // context (which will be a namespace scope) as the template. 836 if (D->isOutOfLine()) 837 Method->setLexicalDeclContext(D->getLexicalDeclContext()); 838 839 // Attach the parameters 840 for (unsigned P = 0; P < Params.size(); ++P) 841 Params[P]->setOwningFunction(Method); 842 Method->setParams(SemaRef.Context, Params.data(), Params.size()); 843 844 if (InitMethodInstantiation(Method, D)) 845 Method->setInvalidDecl(); 846 847 LookupResult Previous(SemaRef, Name, SourceLocation(), 848 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 849 850 if (!FunctionTemplate || TemplateParams) { 851 SemaRef.LookupQualifiedName(Previous, Owner); 852 853 // In C++, the previous declaration we find might be a tag type 854 // (class or enum). In this case, the new declaration will hide the 855 // tag type. Note that this does does not apply if we're declaring a 856 // typedef (C++ [dcl.typedef]p4). 857 if (Previous.isSingleTagDecl()) 858 Previous.clear(); 859 } 860 861 bool Redeclaration = false; 862 bool OverloadableAttrRequired = false; 863 SemaRef.CheckFunctionDeclaration(Method, Previous, false, Redeclaration, 864 /*FIXME:*/OverloadableAttrRequired); 865 866 if (D->isPure()) 867 SemaRef.CheckPureMethod(Method, SourceRange()); 868 869 if (!FunctionTemplate && (!Method->isInvalidDecl() || Previous.empty()) && 870 !Method->getFriendObjectKind()) 871 Owner->addDecl(Method); 872 873 SemaRef.AddOverriddenMethods(Record, Method); 874 875 return Method; 876} 877 878Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { 879 return VisitCXXMethodDecl(D); 880} 881 882Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { 883 return VisitCXXMethodDecl(D); 884} 885 886Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { 887 return VisitCXXMethodDecl(D); 888} 889 890ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { 891 QualType T; 892 DeclaratorInfo *DI = D->getDeclaratorInfo(); 893 if (DI) { 894 DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), 895 D->getDeclName()); 896 if (DI) T = DI->getType(); 897 } else { 898 T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(), 899 D->getDeclName()); 900 DI = 0; 901 } 902 903 if (T.isNull()) 904 return 0; 905 906 T = SemaRef.adjustParameterType(T); 907 908 // Allocate the parameter 909 ParmVarDecl *Param 910 = ParmVarDecl::Create(SemaRef.Context, Owner, D->getLocation(), 911 D->getIdentifier(), T, DI, D->getStorageClass(), 0); 912 913 // Mark the default argument as being uninstantiated. 914 if (D->hasUninstantiatedDefaultArg()) 915 Param->setUninstantiatedDefaultArg(D->getUninstantiatedDefaultArg()); 916 else if (Expr *Arg = D->getDefaultArg()) 917 Param->setUninstantiatedDefaultArg(Arg); 918 919 // Note: we don't try to instantiate function parameters until after 920 // we've instantiated the function's type. Therefore, we don't have 921 // to check for 'void' parameter types here. 922 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 923 return Param; 924} 925 926Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( 927 TemplateTypeParmDecl *D) { 928 // TODO: don't always clone when decls are refcounted. 929 const Type* T = D->getTypeForDecl(); 930 assert(T->isTemplateTypeParmType()); 931 const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>(); 932 933 TemplateTypeParmDecl *Inst = 934 TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 935 TTPT->getDepth() - 1, TTPT->getIndex(), 936 TTPT->getName(), 937 D->wasDeclaredWithTypename(), 938 D->isParameterPack()); 939 940 if (D->hasDefaultArgument()) 941 Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); 942 943 // Introduce this template parameter's instantiation into the instantiation 944 // scope. 945 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst); 946 947 return Inst; 948} 949 950Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( 951 NonTypeTemplateParmDecl *D) { 952 // Substitute into the type of the non-type template parameter. 953 QualType T; 954 DeclaratorInfo *DI = D->getDeclaratorInfo(); 955 if (DI) { 956 DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), 957 D->getDeclName()); 958 if (DI) T = DI->getType(); 959 } else { 960 T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(), 961 D->getDeclName()); 962 DI = 0; 963 } 964 if (T.isNull()) 965 return 0; 966 967 // Check that this type is acceptable for a non-type template parameter. 968 bool Invalid = false; 969 T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation()); 970 if (T.isNull()) { 971 T = SemaRef.Context.IntTy; 972 Invalid = true; 973 } 974 975 NonTypeTemplateParmDecl *Param 976 = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 977 D->getDepth() - 1, D->getPosition(), 978 D->getIdentifier(), T, DI); 979 if (Invalid) 980 Param->setInvalidDecl(); 981 982 Param->setDefaultArgument(D->getDefaultArgument()); 983 984 // Introduce this template parameter's instantiation into the instantiation 985 // scope. 986 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 987 return Param; 988} 989 990Decl * 991TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( 992 TemplateTemplateParmDecl *D) { 993 // Instantiate the template parameter list of the template template parameter. 994 TemplateParameterList *TempParams = D->getTemplateParameters(); 995 TemplateParameterList *InstParams; 996 { 997 // Perform the actual substitution of template parameters within a new, 998 // local instantiation scope. 999 Sema::LocalInstantiationScope Scope(SemaRef); 1000 InstParams = SubstTemplateParams(TempParams); 1001 if (!InstParams) 1002 return NULL; 1003 } 1004 1005 // Build the template template parameter. 1006 TemplateTemplateParmDecl *Param 1007 = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1008 D->getDepth() - 1, D->getPosition(), 1009 D->getIdentifier(), InstParams); 1010 Param->setDefaultArgument(D->getDefaultArgument()); 1011 1012 // Introduce this template parameter's instantiation into the instantiation 1013 // scope. 1014 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 1015 1016 return Param; 1017} 1018 1019Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) { 1020 // Using directives are never dependent, so they require no explicit 1021 1022 UsingDirectiveDecl *Inst 1023 = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1024 D->getNamespaceKeyLocation(), 1025 D->getQualifierRange(), D->getQualifier(), 1026 D->getIdentLocation(), 1027 D->getNominatedNamespace(), 1028 D->getCommonAncestor()); 1029 Owner->addDecl(Inst); 1030 return Inst; 1031} 1032 1033Decl * TemplateDeclInstantiator 1034 ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) { 1035 NestedNameSpecifier *NNS = 1036 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 1037 D->getTargetNestedNameRange(), 1038 TemplateArgs); 1039 if (!NNS) 1040 return 0; 1041 1042 CXXScopeSpec SS; 1043 SS.setRange(D->getTargetNestedNameRange()); 1044 SS.setScopeRep(NNS); 1045 1046 NamedDecl *UD = 1047 SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), 1048 D->getUsingLoc(), SS, D->getLocation(), 1049 D->getDeclName(), 0, 1050 /*instantiation*/ true, 1051 /*typename*/ true, D->getTypenameLoc()); 1052 if (UD) 1053 SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD), 1054 D); 1055 return UD; 1056} 1057 1058Decl * TemplateDeclInstantiator 1059 ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) { 1060 NestedNameSpecifier *NNS = 1061 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 1062 D->getTargetNestedNameRange(), 1063 TemplateArgs); 1064 if (!NNS) 1065 return 0; 1066 1067 CXXScopeSpec SS; 1068 SS.setRange(D->getTargetNestedNameRange()); 1069 SS.setScopeRep(NNS); 1070 1071 NamedDecl *UD = 1072 SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), 1073 D->getUsingLoc(), SS, D->getLocation(), 1074 D->getDeclName(), 0, 1075 /*instantiation*/ true, 1076 /*typename*/ false, SourceLocation()); 1077 if (UD) 1078 SemaRef.Context.setInstantiatedFromUnresolvedUsingDecl(cast<UsingDecl>(UD), 1079 D); 1080 return UD; 1081} 1082 1083Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, 1084 const MultiLevelTemplateArgumentList &TemplateArgs) { 1085 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); 1086 return Instantiator.Visit(D); 1087} 1088 1089/// \brief Instantiates a nested template parameter list in the current 1090/// instantiation context. 1091/// 1092/// \param L The parameter list to instantiate 1093/// 1094/// \returns NULL if there was an error 1095TemplateParameterList * 1096TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { 1097 // Get errors for all the parameters before bailing out. 1098 bool Invalid = false; 1099 1100 unsigned N = L->size(); 1101 typedef llvm::SmallVector<NamedDecl *, 8> ParamVector; 1102 ParamVector Params; 1103 Params.reserve(N); 1104 for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); 1105 PI != PE; ++PI) { 1106 NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); 1107 Params.push_back(D); 1108 Invalid = Invalid || !D || D->isInvalidDecl(); 1109 } 1110 1111 // Clean up if we had an error. 1112 if (Invalid) { 1113 for (ParamVector::iterator PI = Params.begin(), PE = Params.end(); 1114 PI != PE; ++PI) 1115 if (*PI) 1116 (*PI)->Destroy(SemaRef.Context); 1117 return NULL; 1118 } 1119 1120 TemplateParameterList *InstL 1121 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), 1122 L->getLAngleLoc(), &Params.front(), N, 1123 L->getRAngleLoc()); 1124 return InstL; 1125} 1126 1127/// \brief Instantiate the declaration of a class template partial 1128/// specialization. 1129/// 1130/// \param ClassTemplate the (instantiated) class template that is partially 1131// specialized by the instantiation of \p PartialSpec. 1132/// 1133/// \param PartialSpec the (uninstantiated) class template partial 1134/// specialization that we are instantiating. 1135/// 1136/// \returns true if there was an error, false otherwise. 1137bool 1138TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( 1139 ClassTemplateDecl *ClassTemplate, 1140 ClassTemplatePartialSpecializationDecl *PartialSpec) { 1141 // Create a local instantiation scope for this class template partial 1142 // specialization, which will contain the instantiations of the template 1143 // parameters. 1144 Sema::LocalInstantiationScope Scope(SemaRef); 1145 1146 // Substitute into the template parameters of the class template partial 1147 // specialization. 1148 TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); 1149 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 1150 if (!InstParams) 1151 return true; 1152 1153 // Substitute into the template arguments of the class template partial 1154 // specialization. 1155 const TemplateArgumentLoc *PartialSpecTemplateArgs 1156 = PartialSpec->getTemplateArgsAsWritten(); 1157 unsigned N = PartialSpec->getNumTemplateArgsAsWritten(); 1158 1159 TemplateArgumentListInfo InstTemplateArgs; // no angle locations 1160 for (unsigned I = 0; I != N; ++I) { 1161 TemplateArgumentLoc Loc; 1162 if (SemaRef.Subst(PartialSpecTemplateArgs[I], Loc, TemplateArgs)) 1163 return true; 1164 InstTemplateArgs.addArgument(Loc); 1165 } 1166 1167 1168 // Check that the template argument list is well-formed for this 1169 // class template. 1170 TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(), 1171 InstTemplateArgs.size()); 1172 if (SemaRef.CheckTemplateArgumentList(ClassTemplate, 1173 PartialSpec->getLocation(), 1174 InstTemplateArgs, 1175 false, 1176 Converted)) 1177 return true; 1178 1179 // Figure out where to insert this class template partial specialization 1180 // in the member template's set of class template partial specializations. 1181 llvm::FoldingSetNodeID ID; 1182 ClassTemplatePartialSpecializationDecl::Profile(ID, 1183 Converted.getFlatArguments(), 1184 Converted.flatSize(), 1185 SemaRef.Context); 1186 void *InsertPos = 0; 1187 ClassTemplateSpecializationDecl *PrevDecl 1188 = ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID, 1189 InsertPos); 1190 1191 // Build the canonical type that describes the converted template 1192 // arguments of the class template partial specialization. 1193 QualType CanonType 1194 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), 1195 Converted.getFlatArguments(), 1196 Converted.flatSize()); 1197 1198 // Build the fully-sugared type for this class template 1199 // specialization as the user wrote in the specialization 1200 // itself. This means that we'll pretty-print the type retrieved 1201 // from the specialization's declaration the way that the user 1202 // actually wrote the specialization, rather than formatting the 1203 // name based on the "canonical" representation used to store the 1204 // template arguments in the specialization. 1205 QualType WrittenTy 1206 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), 1207 InstTemplateArgs, 1208 CanonType); 1209 1210 if (PrevDecl) { 1211 // We've already seen a partial specialization with the same template 1212 // parameters and template arguments. This can happen, for example, when 1213 // substituting the outer template arguments ends up causing two 1214 // class template partial specializations of a member class template 1215 // to have identical forms, e.g., 1216 // 1217 // template<typename T, typename U> 1218 // struct Outer { 1219 // template<typename X, typename Y> struct Inner; 1220 // template<typename Y> struct Inner<T, Y>; 1221 // template<typename Y> struct Inner<U, Y>; 1222 // }; 1223 // 1224 // Outer<int, int> outer; // error: the partial specializations of Inner 1225 // // have the same signature. 1226 SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared) 1227 << WrittenTy; 1228 SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here) 1229 << SemaRef.Context.getTypeDeclType(PrevDecl); 1230 return true; 1231 } 1232 1233 1234 // Create the class template partial specialization declaration. 1235 ClassTemplatePartialSpecializationDecl *InstPartialSpec 1236 = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, Owner, 1237 PartialSpec->getLocation(), 1238 InstParams, 1239 ClassTemplate, 1240 Converted, 1241 InstTemplateArgs, 1242 0); 1243 InstPartialSpec->setInstantiatedFromMember(PartialSpec); 1244 InstPartialSpec->setTypeAsWritten(WrittenTy); 1245 1246 // Add this partial specialization to the set of class template partial 1247 // specializations. 1248 ClassTemplate->getPartialSpecializations().InsertNode(InstPartialSpec, 1249 InsertPos); 1250 return false; 1251} 1252 1253/// \brief Does substitution on the type of the given function, including 1254/// all of the function parameters. 1255/// 1256/// \param D The function whose type will be the basis of the substitution 1257/// 1258/// \param Params the instantiated parameter declarations 1259 1260/// \returns the instantiated function's type if successful, a NULL 1261/// type if there was an error. 1262QualType 1263TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, 1264 llvm::SmallVectorImpl<ParmVarDecl *> &Params) { 1265 bool InvalidDecl = false; 1266 1267 // Substitute all of the function's formal parameter types. 1268 TemplateDeclInstantiator ParamInstantiator(SemaRef, 0, TemplateArgs); 1269 llvm::SmallVector<QualType, 4> ParamTys; 1270 for (FunctionDecl::param_iterator P = D->param_begin(), 1271 PEnd = D->param_end(); 1272 P != PEnd; ++P) { 1273 if (ParmVarDecl *PInst = ParamInstantiator.VisitParmVarDecl(*P)) { 1274 if (PInst->getType()->isVoidType()) { 1275 SemaRef.Diag(PInst->getLocation(), diag::err_param_with_void_type); 1276 PInst->setInvalidDecl(); 1277 } else if (SemaRef.RequireNonAbstractType(PInst->getLocation(), 1278 PInst->getType(), 1279 diag::err_abstract_type_in_decl, 1280 Sema::AbstractParamType)) 1281 PInst->setInvalidDecl(); 1282 1283 Params.push_back(PInst); 1284 ParamTys.push_back(PInst->getType()); 1285 1286 if (PInst->isInvalidDecl()) 1287 InvalidDecl = true; 1288 } else 1289 InvalidDecl = true; 1290 } 1291 1292 // FIXME: Deallocate dead declarations. 1293 if (InvalidDecl) 1294 return QualType(); 1295 1296 const FunctionProtoType *Proto = D->getType()->getAs<FunctionProtoType>(); 1297 assert(Proto && "Missing prototype?"); 1298 QualType ResultType 1299 = SemaRef.SubstType(Proto->getResultType(), TemplateArgs, 1300 D->getLocation(), D->getDeclName()); 1301 if (ResultType.isNull()) 1302 return QualType(); 1303 1304 return SemaRef.BuildFunctionType(ResultType, ParamTys.data(), ParamTys.size(), 1305 Proto->isVariadic(), Proto->getTypeQuals(), 1306 D->getLocation(), D->getDeclName()); 1307} 1308 1309/// \brief Initializes the common fields of an instantiation function 1310/// declaration (New) from the corresponding fields of its template (Tmpl). 1311/// 1312/// \returns true if there was an error 1313bool 1314TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, 1315 FunctionDecl *Tmpl) { 1316 if (Tmpl->isDeleted()) 1317 New->setDeleted(); 1318 1319 // If we are performing substituting explicitly-specified template arguments 1320 // or deduced template arguments into a function template and we reach this 1321 // point, we are now past the point where SFINAE applies and have committed 1322 // to keeping the new function template specialization. We therefore 1323 // convert the active template instantiation for the function template 1324 // into a template instantiation for this specific function template 1325 // specialization, which is not a SFINAE context, so that we diagnose any 1326 // further errors in the declaration itself. 1327 typedef Sema::ActiveTemplateInstantiation ActiveInstType; 1328 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); 1329 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || 1330 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { 1331 if (FunctionTemplateDecl *FunTmpl 1332 = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { 1333 assert(FunTmpl->getTemplatedDecl() == Tmpl && 1334 "Deduction from the wrong function template?"); 1335 (void) FunTmpl; 1336 ActiveInst.Kind = ActiveInstType::TemplateInstantiation; 1337 ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); 1338 --SemaRef.NonInstantiationEntries; 1339 } 1340 } 1341 1342 return false; 1343} 1344 1345/// \brief Initializes common fields of an instantiated method 1346/// declaration (New) from the corresponding fields of its template 1347/// (Tmpl). 1348/// 1349/// \returns true if there was an error 1350bool 1351TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, 1352 CXXMethodDecl *Tmpl) { 1353 if (InitFunctionInstantiation(New, Tmpl)) 1354 return true; 1355 1356 CXXRecordDecl *Record = cast<CXXRecordDecl>(Owner); 1357 New->setAccess(Tmpl->getAccess()); 1358 if (Tmpl->isVirtualAsWritten()) { 1359 New->setVirtualAsWritten(true); 1360 Record->setAggregate(false); 1361 Record->setPOD(false); 1362 Record->setEmpty(false); 1363 Record->setPolymorphic(true); 1364 } 1365 1366 // FIXME: attributes 1367 // FIXME: New needs a pointer to Tmpl 1368 return false; 1369} 1370 1371/// \brief Instantiate the definition of the given function from its 1372/// template. 1373/// 1374/// \param PointOfInstantiation the point at which the instantiation was 1375/// required. Note that this is not precisely a "point of instantiation" 1376/// for the function, but it's close. 1377/// 1378/// \param Function the already-instantiated declaration of a 1379/// function template specialization or member function of a class template 1380/// specialization. 1381/// 1382/// \param Recursive if true, recursively instantiates any functions that 1383/// are required by this instantiation. 1384/// 1385/// \param DefinitionRequired if true, then we are performing an explicit 1386/// instantiation where the body of the function is required. Complain if 1387/// there is no such body. 1388void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, 1389 FunctionDecl *Function, 1390 bool Recursive, 1391 bool DefinitionRequired) { 1392 if (Function->isInvalidDecl()) 1393 return; 1394 1395 assert(!Function->getBody() && "Already instantiated!"); 1396 1397 // Never instantiate an explicit specialization. 1398 if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 1399 return; 1400 1401 // Find the function body that we'll be substituting. 1402 const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern(); 1403 Stmt *Pattern = 0; 1404 if (PatternDecl) 1405 Pattern = PatternDecl->getBody(PatternDecl); 1406 1407 if (!Pattern) { 1408 if (DefinitionRequired) { 1409 if (Function->getPrimaryTemplate()) 1410 Diag(PointOfInstantiation, 1411 diag::err_explicit_instantiation_undefined_func_template) 1412 << Function->getPrimaryTemplate(); 1413 else 1414 Diag(PointOfInstantiation, 1415 diag::err_explicit_instantiation_undefined_member) 1416 << 1 << Function->getDeclName() << Function->getDeclContext(); 1417 1418 if (PatternDecl) 1419 Diag(PatternDecl->getLocation(), 1420 diag::note_explicit_instantiation_here); 1421 } 1422 1423 return; 1424 } 1425 1426 // C++0x [temp.explicit]p9: 1427 // Except for inline functions, other explicit instantiation declarations 1428 // have the effect of suppressing the implicit instantiation of the entity 1429 // to which they refer. 1430 if (Function->getTemplateSpecializationKind() 1431 == TSK_ExplicitInstantiationDeclaration && 1432 !PatternDecl->isInlined()) 1433 return; 1434 1435 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); 1436 if (Inst) 1437 return; 1438 1439 // If we're performing recursive template instantiation, create our own 1440 // queue of pending implicit instantiations that we will instantiate later, 1441 // while we're still within our own instantiation context. 1442 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1443 if (Recursive) 1444 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1445 1446 ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function)); 1447 1448 // Introduce a new scope where local variable instantiations will be 1449 // recorded. 1450 LocalInstantiationScope Scope(*this); 1451 1452 // Introduce the instantiated function parameters into the local 1453 // instantiation scope. 1454 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) 1455 Scope.InstantiatedLocal(PatternDecl->getParamDecl(I), 1456 Function->getParamDecl(I)); 1457 1458 // Enter the scope of this instantiation. We don't use 1459 // PushDeclContext because we don't have a scope. 1460 DeclContext *PreviousContext = CurContext; 1461 CurContext = Function; 1462 1463 MultiLevelTemplateArgumentList TemplateArgs = 1464 getTemplateInstantiationArgs(Function); 1465 1466 // If this is a constructor, instantiate the member initializers. 1467 if (const CXXConstructorDecl *Ctor = 1468 dyn_cast<CXXConstructorDecl>(PatternDecl)) { 1469 InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor, 1470 TemplateArgs); 1471 } 1472 1473 // Instantiate the function body. 1474 OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs); 1475 1476 if (Body.isInvalid()) 1477 Function->setInvalidDecl(); 1478 1479 ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body), 1480 /*IsInstantiation=*/true); 1481 1482 CurContext = PreviousContext; 1483 1484 DeclGroupRef DG(Function); 1485 Consumer.HandleTopLevelDecl(DG); 1486 1487 if (Recursive) { 1488 // Instantiate any pending implicit instantiations found during the 1489 // instantiation of this template. 1490 PerformPendingImplicitInstantiations(); 1491 1492 // Restore the set of pending implicit instantiations. 1493 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1494 } 1495} 1496 1497/// \brief Instantiate the definition of the given variable from its 1498/// template. 1499/// 1500/// \param PointOfInstantiation the point at which the instantiation was 1501/// required. Note that this is not precisely a "point of instantiation" 1502/// for the function, but it's close. 1503/// 1504/// \param Var the already-instantiated declaration of a static member 1505/// variable of a class template specialization. 1506/// 1507/// \param Recursive if true, recursively instantiates any functions that 1508/// are required by this instantiation. 1509/// 1510/// \param DefinitionRequired if true, then we are performing an explicit 1511/// instantiation where an out-of-line definition of the member variable 1512/// is required. Complain if there is no such definition. 1513void Sema::InstantiateStaticDataMemberDefinition( 1514 SourceLocation PointOfInstantiation, 1515 VarDecl *Var, 1516 bool Recursive, 1517 bool DefinitionRequired) { 1518 if (Var->isInvalidDecl()) 1519 return; 1520 1521 // Find the out-of-line definition of this static data member. 1522 VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); 1523 assert(Def && "This data member was not instantiated from a template?"); 1524 assert(Def->isStaticDataMember() && "Not a static data member?"); 1525 Def = Def->getOutOfLineDefinition(); 1526 1527 if (!Def) { 1528 // We did not find an out-of-line definition of this static data member, 1529 // so we won't perform any instantiation. Rather, we rely on the user to 1530 // instantiate this definition (or provide a specialization for it) in 1531 // another translation unit. 1532 if (DefinitionRequired) { 1533 Def = Var->getInstantiatedFromStaticDataMember(); 1534 Diag(PointOfInstantiation, 1535 diag::err_explicit_instantiation_undefined_member) 1536 << 2 << Var->getDeclName() << Var->getDeclContext(); 1537 Diag(Def->getLocation(), diag::note_explicit_instantiation_here); 1538 } 1539 1540 return; 1541 } 1542 1543 // Never instantiate an explicit specialization. 1544 if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 1545 return; 1546 1547 // C++0x [temp.explicit]p9: 1548 // Except for inline functions, other explicit instantiation declarations 1549 // have the effect of suppressing the implicit instantiation of the entity 1550 // to which they refer. 1551 if (Var->getTemplateSpecializationKind() 1552 == TSK_ExplicitInstantiationDeclaration) 1553 return; 1554 1555 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); 1556 if (Inst) 1557 return; 1558 1559 // If we're performing recursive template instantiation, create our own 1560 // queue of pending implicit instantiations that we will instantiate later, 1561 // while we're still within our own instantiation context. 1562 std::deque<PendingImplicitInstantiation> SavedPendingImplicitInstantiations; 1563 if (Recursive) 1564 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1565 1566 // Enter the scope of this instantiation. We don't use 1567 // PushDeclContext because we don't have a scope. 1568 DeclContext *PreviousContext = CurContext; 1569 CurContext = Var->getDeclContext(); 1570 1571 VarDecl *OldVar = Var; 1572 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), 1573 getTemplateInstantiationArgs(Var))); 1574 CurContext = PreviousContext; 1575 1576 if (Var) { 1577 Var->setPreviousDeclaration(OldVar); 1578 MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); 1579 assert(MSInfo && "Missing member specialization information?"); 1580 Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), 1581 MSInfo->getPointOfInstantiation()); 1582 DeclGroupRef DG(Var); 1583 Consumer.HandleTopLevelDecl(DG); 1584 } 1585 1586 if (Recursive) { 1587 // Instantiate any pending implicit instantiations found during the 1588 // instantiation of this template. 1589 PerformPendingImplicitInstantiations(); 1590 1591 // Restore the set of pending implicit instantiations. 1592 PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); 1593 } 1594} 1595 1596void 1597Sema::InstantiateMemInitializers(CXXConstructorDecl *New, 1598 const CXXConstructorDecl *Tmpl, 1599 const MultiLevelTemplateArgumentList &TemplateArgs) { 1600 1601 llvm::SmallVector<MemInitTy*, 4> NewInits; 1602 1603 // Instantiate all the initializers. 1604 for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), 1605 InitsEnd = Tmpl->init_end(); 1606 Inits != InitsEnd; ++Inits) { 1607 CXXBaseOrMemberInitializer *Init = *Inits; 1608 1609 ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this); 1610 1611 // Instantiate all the arguments. 1612 for (ExprIterator Args = Init->arg_begin(), ArgsEnd = Init->arg_end(); 1613 Args != ArgsEnd; ++Args) { 1614 OwningExprResult NewArg = SubstExpr(*Args, TemplateArgs); 1615 1616 if (NewArg.isInvalid()) 1617 New->setInvalidDecl(); 1618 else 1619 NewArgs.push_back(NewArg.takeAs<Expr>()); 1620 } 1621 1622 MemInitResult NewInit; 1623 1624 if (Init->isBaseInitializer()) { 1625 QualType BaseType(Init->getBaseClass(), 0); 1626 BaseType = SubstType(BaseType, TemplateArgs, Init->getSourceLocation(), 1627 New->getDeclName()); 1628 1629 NewInit = BuildBaseInitializer(BaseType, 1630 (Expr **)NewArgs.data(), 1631 NewArgs.size(), 1632 Init->getSourceLocation(), 1633 Init->getRParenLoc(), 1634 New->getParent()); 1635 } else if (Init->isMemberInitializer()) { 1636 FieldDecl *Member; 1637 1638 // Is this an anonymous union? 1639 if (FieldDecl *UnionInit = Init->getAnonUnionMember()) 1640 Member = cast<FieldDecl>(FindInstantiatedDecl(UnionInit, TemplateArgs)); 1641 else 1642 Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMember(), 1643 TemplateArgs)); 1644 1645 NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(), 1646 NewArgs.size(), 1647 Init->getSourceLocation(), 1648 Init->getRParenLoc()); 1649 } 1650 1651 if (NewInit.isInvalid()) 1652 New->setInvalidDecl(); 1653 else { 1654 // FIXME: It would be nice if ASTOwningVector had a release function. 1655 NewArgs.take(); 1656 1657 NewInits.push_back((MemInitTy *)NewInit.get()); 1658 } 1659 } 1660 1661 // Assign all the initializers to the new constructor. 1662 ActOnMemInitializers(DeclPtrTy::make(New), 1663 /*FIXME: ColonLoc */ 1664 SourceLocation(), 1665 NewInits.data(), NewInits.size()); 1666} 1667 1668// TODO: this could be templated if the various decl types used the 1669// same method name. 1670static bool isInstantiationOf(ClassTemplateDecl *Pattern, 1671 ClassTemplateDecl *Instance) { 1672 Pattern = Pattern->getCanonicalDecl(); 1673 1674 do { 1675 Instance = Instance->getCanonicalDecl(); 1676 if (Pattern == Instance) return true; 1677 Instance = Instance->getInstantiatedFromMemberTemplate(); 1678 } while (Instance); 1679 1680 return false; 1681} 1682 1683static bool isInstantiationOf(FunctionTemplateDecl *Pattern, 1684 FunctionTemplateDecl *Instance) { 1685 Pattern = Pattern->getCanonicalDecl(); 1686 1687 do { 1688 Instance = Instance->getCanonicalDecl(); 1689 if (Pattern == Instance) return true; 1690 Instance = Instance->getInstantiatedFromMemberTemplate(); 1691 } while (Instance); 1692 1693 return false; 1694} 1695 1696static bool 1697isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern, 1698 ClassTemplatePartialSpecializationDecl *Instance) { 1699 Pattern 1700 = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl()); 1701 do { 1702 Instance = cast<ClassTemplatePartialSpecializationDecl>( 1703 Instance->getCanonicalDecl()); 1704 if (Pattern == Instance) 1705 return true; 1706 Instance = Instance->getInstantiatedFromMember(); 1707 } while (Instance); 1708 1709 return false; 1710} 1711 1712static bool isInstantiationOf(CXXRecordDecl *Pattern, 1713 CXXRecordDecl *Instance) { 1714 Pattern = Pattern->getCanonicalDecl(); 1715 1716 do { 1717 Instance = Instance->getCanonicalDecl(); 1718 if (Pattern == Instance) return true; 1719 Instance = Instance->getInstantiatedFromMemberClass(); 1720 } while (Instance); 1721 1722 return false; 1723} 1724 1725static bool isInstantiationOf(FunctionDecl *Pattern, 1726 FunctionDecl *Instance) { 1727 Pattern = Pattern->getCanonicalDecl(); 1728 1729 do { 1730 Instance = Instance->getCanonicalDecl(); 1731 if (Pattern == Instance) return true; 1732 Instance = Instance->getInstantiatedFromMemberFunction(); 1733 } while (Instance); 1734 1735 return false; 1736} 1737 1738static bool isInstantiationOf(EnumDecl *Pattern, 1739 EnumDecl *Instance) { 1740 Pattern = Pattern->getCanonicalDecl(); 1741 1742 do { 1743 Instance = Instance->getCanonicalDecl(); 1744 if (Pattern == Instance) return true; 1745 Instance = Instance->getInstantiatedFromMemberEnum(); 1746 } while (Instance); 1747 1748 return false; 1749} 1750 1751static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern, 1752 UsingDecl *Instance, 1753 ASTContext &C) { 1754 return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern; 1755} 1756 1757static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern, 1758 UsingDecl *Instance, 1759 ASTContext &C) { 1760 return C.getInstantiatedFromUnresolvedUsingDecl(Instance) == Pattern; 1761} 1762 1763static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, 1764 VarDecl *Instance) { 1765 assert(Instance->isStaticDataMember()); 1766 1767 Pattern = Pattern->getCanonicalDecl(); 1768 1769 do { 1770 Instance = Instance->getCanonicalDecl(); 1771 if (Pattern == Instance) return true; 1772 Instance = Instance->getInstantiatedFromStaticDataMember(); 1773 } while (Instance); 1774 1775 return false; 1776} 1777 1778static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { 1779 if (D->getKind() != Other->getKind()) { 1780 if (UnresolvedUsingTypenameDecl *UUD 1781 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 1782 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 1783 return isInstantiationOf(UUD, UD, Ctx); 1784 } 1785 } 1786 1787 if (UnresolvedUsingValueDecl *UUD 1788 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 1789 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 1790 return isInstantiationOf(UUD, UD, Ctx); 1791 } 1792 } 1793 1794 return false; 1795 } 1796 1797 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other)) 1798 return isInstantiationOf(cast<CXXRecordDecl>(D), Record); 1799 1800 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other)) 1801 return isInstantiationOf(cast<FunctionDecl>(D), Function); 1802 1803 if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other)) 1804 return isInstantiationOf(cast<EnumDecl>(D), Enum); 1805 1806 if (VarDecl *Var = dyn_cast<VarDecl>(Other)) 1807 if (Var->isStaticDataMember()) 1808 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var); 1809 1810 if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other)) 1811 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp); 1812 1813 if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other)) 1814 return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp); 1815 1816 if (ClassTemplatePartialSpecializationDecl *PartialSpec 1817 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Other)) 1818 return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D), 1819 PartialSpec); 1820 1821 if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) { 1822 if (!Field->getDeclName()) { 1823 // This is an unnamed field. 1824 return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == 1825 cast<FieldDecl>(D); 1826 } 1827 } 1828 1829 return D->getDeclName() && isa<NamedDecl>(Other) && 1830 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName(); 1831} 1832 1833template<typename ForwardIterator> 1834static NamedDecl *findInstantiationOf(ASTContext &Ctx, 1835 NamedDecl *D, 1836 ForwardIterator first, 1837 ForwardIterator last) { 1838 for (; first != last; ++first) 1839 if (isInstantiationOf(Ctx, D, *first)) 1840 return cast<NamedDecl>(*first); 1841 1842 return 0; 1843} 1844 1845/// \brief Finds the instantiation of the given declaration context 1846/// within the current instantiation. 1847/// 1848/// \returns NULL if there was an error 1849DeclContext *Sema::FindInstantiatedContext(DeclContext* DC, 1850 const MultiLevelTemplateArgumentList &TemplateArgs) { 1851 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) { 1852 Decl* ID = FindInstantiatedDecl(D, TemplateArgs); 1853 return cast_or_null<DeclContext>(ID); 1854 } else return DC; 1855} 1856 1857/// \brief Find the instantiation of the given declaration within the 1858/// current instantiation. 1859/// 1860/// This routine is intended to be used when \p D is a declaration 1861/// referenced from within a template, that needs to mapped into the 1862/// corresponding declaration within an instantiation. For example, 1863/// given: 1864/// 1865/// \code 1866/// template<typename T> 1867/// struct X { 1868/// enum Kind { 1869/// KnownValue = sizeof(T) 1870/// }; 1871/// 1872/// bool getKind() const { return KnownValue; } 1873/// }; 1874/// 1875/// template struct X<int>; 1876/// \endcode 1877/// 1878/// In the instantiation of X<int>::getKind(), we need to map the 1879/// EnumConstantDecl for KnownValue (which refers to 1880/// X<T>::<Kind>::KnownValue) to its instantiation 1881/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs 1882/// this mapping from within the instantiation of X<int>. 1883NamedDecl *Sema::FindInstantiatedDecl(NamedDecl *D, 1884 const MultiLevelTemplateArgumentList &TemplateArgs) { 1885 DeclContext *ParentDC = D->getDeclContext(); 1886 if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) || 1887 isa<TemplateTypeParmDecl>(D) || isa<TemplateTypeParmDecl>(D) || 1888 ParentDC->isFunctionOrMethod()) { 1889 // D is a local of some kind. Look into the map of local 1890 // declarations to their instantiations. 1891 return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D)); 1892 } 1893 1894 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { 1895 if (!Record->isDependentContext()) 1896 return D; 1897 1898 // If the RecordDecl is actually the injected-class-name or a "templated" 1899 // declaration for a class template or class template partial 1900 // specialization, substitute into the injected-class-name of the 1901 // class template or partial specialization to find the new DeclContext. 1902 QualType T; 1903 ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate(); 1904 1905 if (ClassTemplate) { 1906 T = ClassTemplate->getInjectedClassNameType(Context); 1907 } else if (ClassTemplatePartialSpecializationDecl *PartialSpec 1908 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { 1909 T = Context.getTypeDeclType(Record); 1910 ClassTemplate = PartialSpec->getSpecializedTemplate(); 1911 } 1912 1913 if (!T.isNull()) { 1914 // Substitute into the injected-class-name to get the type corresponding 1915 // to the instantiation we want. This substitution should never fail, 1916 // since we know we can instantiate the injected-class-name or we wouldn't 1917 // have gotten to the injected-class-name! 1918 // FIXME: Can we use the CurrentInstantiationScope to avoid this extra 1919 // instantiation in the common case? 1920 T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName()); 1921 assert(!T.isNull() && "Instantiation of injected-class-name cannot fail."); 1922 1923 if (!T->isDependentType()) { 1924 assert(T->isRecordType() && "Instantiation must produce a record type"); 1925 return T->getAs<RecordType>()->getDecl(); 1926 } 1927 1928 // We are performing "partial" template instantiation to create the 1929 // member declarations for the members of a class template 1930 // specialization. Therefore, D is actually referring to something in 1931 // the current instantiation. Look through the current context, 1932 // which contains actual instantiations, to find the instantiation of 1933 // the "current instantiation" that D refers to. 1934 for (DeclContext *DC = CurContext; !DC->isFileContext(); 1935 DC = DC->getParent()) { 1936 if (ClassTemplateSpecializationDecl *Spec 1937 = dyn_cast<ClassTemplateSpecializationDecl>(DC)) 1938 if (isInstantiationOf(ClassTemplate, 1939 Spec->getSpecializedTemplate())) 1940 return Spec; 1941 } 1942 1943 assert(false && 1944 "Unable to find declaration for the current instantiation"); 1945 return Record; 1946 } 1947 1948 // Fall through to deal with other dependent record types (e.g., 1949 // anonymous unions in class templates). 1950 } 1951 1952 if (!ParentDC->isDependentContext()) 1953 return D; 1954 1955 ParentDC = FindInstantiatedContext(ParentDC, TemplateArgs); 1956 if (!ParentDC) 1957 return 0; 1958 1959 if (ParentDC != D->getDeclContext()) { 1960 // We performed some kind of instantiation in the parent context, 1961 // so now we need to look into the instantiated parent context to 1962 // find the instantiation of the declaration D. 1963 NamedDecl *Result = 0; 1964 if (D->getDeclName()) { 1965 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); 1966 Result = findInstantiationOf(Context, D, Found.first, Found.second); 1967 } else { 1968 // Since we don't have a name for the entity we're looking for, 1969 // our only option is to walk through all of the declarations to 1970 // find that name. This will occur in a few cases: 1971 // 1972 // - anonymous struct/union within a template 1973 // - unnamed class/struct/union/enum within a template 1974 // 1975 // FIXME: Find a better way to find these instantiations! 1976 Result = findInstantiationOf(Context, D, 1977 ParentDC->decls_begin(), 1978 ParentDC->decls_end()); 1979 } 1980 1981 assert(Result && "Unable to find instantiation of declaration!"); 1982 D = Result; 1983 } 1984 1985 return D; 1986} 1987 1988/// \brief Performs template instantiation for all implicit template 1989/// instantiations we have seen until this point. 1990void Sema::PerformPendingImplicitInstantiations() { 1991 while (!PendingImplicitInstantiations.empty()) { 1992 PendingImplicitInstantiation Inst = PendingImplicitInstantiations.front(); 1993 PendingImplicitInstantiations.pop_front(); 1994 1995 // Instantiate function definitions 1996 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) { 1997 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function), 1998 Function->getLocation(), *this, 1999 Context.getSourceManager(), 2000 "instantiating function definition"); 2001 2002 if (!Function->getBody()) 2003 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true); 2004 continue; 2005 } 2006 2007 // Instantiate static data member definitions. 2008 VarDecl *Var = cast<VarDecl>(Inst.first); 2009 assert(Var->isStaticDataMember() && "Not a static data member?"); 2010 2011 PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var), 2012 Var->getLocation(), *this, 2013 Context.getSourceManager(), 2014 "instantiating static data member " 2015 "definition"); 2016 2017 InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true); 2018 } 2019} 2020