SemaTemplateInstantiateDecl.cpp revision c54d688c604d28dcb9ab8f92047837c10c8f9c61
1//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/ 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7//===----------------------------------------------------------------------===/ 8// 9// This file implements C++ template instantiation for declarations. 10// 11//===----------------------------------------------------------------------===/ 12#include "clang/Sema/SemaInternal.h" 13#include "clang/Sema/Lookup.h" 14#include "clang/Sema/PrettyDeclStackTrace.h" 15#include "clang/Sema/Template.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/DeclVisitor.h" 20#include "clang/AST/DependentDiagnostic.h" 21#include "clang/AST/Expr.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/TypeLoc.h" 24#include "clang/Lex/Preprocessor.h" 25 26using namespace clang; 27 28namespace { 29 class TemplateDeclInstantiator 30 : public DeclVisitor<TemplateDeclInstantiator, Decl *> { 31 Sema &SemaRef; 32 DeclContext *Owner; 33 const MultiLevelTemplateArgumentList &TemplateArgs; 34 35 public: 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.inc. 43 Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D); 44 Decl *VisitNamespaceDecl(NamespaceDecl *D); 45 Decl *VisitNamespaceAliasDecl(NamespaceAliasDecl *D); 46 Decl *VisitTypedefDecl(TypedefDecl *D); 47 Decl *VisitVarDecl(VarDecl *D); 48 Decl *VisitAccessSpecDecl(AccessSpecDecl *D); 49 Decl *VisitFieldDecl(FieldDecl *D); 50 Decl *VisitStaticAssertDecl(StaticAssertDecl *D); 51 Decl *VisitEnumDecl(EnumDecl *D); 52 Decl *VisitEnumConstantDecl(EnumConstantDecl *D); 53 Decl *VisitFriendDecl(FriendDecl *D); 54 Decl *VisitFunctionDecl(FunctionDecl *D, 55 TemplateParameterList *TemplateParams = 0); 56 Decl *VisitCXXRecordDecl(CXXRecordDecl *D); 57 Decl *VisitCXXMethodDecl(CXXMethodDecl *D, 58 TemplateParameterList *TemplateParams = 0); 59 Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D); 60 Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D); 61 Decl *VisitCXXConversionDecl(CXXConversionDecl *D); 62 ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D); 63 Decl *VisitClassTemplateDecl(ClassTemplateDecl *D); 64 Decl *VisitClassTemplatePartialSpecializationDecl( 65 ClassTemplatePartialSpecializationDecl *D); 66 Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D); 67 Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D); 68 Decl *VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D); 69 Decl *VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D); 70 Decl *VisitUsingDirectiveDecl(UsingDirectiveDecl *D); 71 Decl *VisitUsingDecl(UsingDecl *D); 72 Decl *VisitUsingShadowDecl(UsingShadowDecl *D); 73 Decl *VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D); 74 Decl *VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D); 75 76 // Base case. FIXME: Remove once we can instantiate everything. 77 Decl *VisitDecl(Decl *D) { 78 unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID( 79 Diagnostic::Error, 80 "cannot instantiate %0 yet"); 81 SemaRef.Diag(D->getLocation(), DiagID) 82 << D->getDeclKindName(); 83 84 return 0; 85 } 86 87 // Helper functions for instantiating methods. 88 TypeSourceInfo *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 SubstQualifier(const DeclaratorDecl *OldDecl, 97 DeclaratorDecl *NewDecl); 98 bool SubstQualifier(const TagDecl *OldDecl, 99 TagDecl *NewDecl); 100 101 bool InstantiateClassTemplatePartialSpecialization( 102 ClassTemplateDecl *ClassTemplate, 103 ClassTemplatePartialSpecializationDecl *PartialSpec); 104 }; 105} 106 107bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl, 108 DeclaratorDecl *NewDecl) { 109 NestedNameSpecifier *OldQual = OldDecl->getQualifier(); 110 if (!OldQual) return false; 111 112 SourceRange QualRange = OldDecl->getQualifierRange(); 113 114 NestedNameSpecifier *NewQual 115 = SemaRef.SubstNestedNameSpecifier(OldQual, QualRange, TemplateArgs); 116 if (!NewQual) 117 return true; 118 119 NewDecl->setQualifierInfo(NewQual, QualRange); 120 return false; 121} 122 123bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl, 124 TagDecl *NewDecl) { 125 NestedNameSpecifier *OldQual = OldDecl->getQualifier(); 126 if (!OldQual) return false; 127 128 SourceRange QualRange = OldDecl->getQualifierRange(); 129 130 NestedNameSpecifier *NewQual 131 = SemaRef.SubstNestedNameSpecifier(OldQual, QualRange, TemplateArgs); 132 if (!NewQual) 133 return true; 134 135 NewDecl->setQualifierInfo(NewQual, QualRange); 136 return false; 137} 138 139// FIXME: Is this still too simple? 140void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs, 141 Decl *Tmpl, Decl *New) { 142 for (AttrVec::const_iterator i = Tmpl->attr_begin(), e = Tmpl->attr_end(); 143 i != e; ++i) { 144 const Attr *TmplAttr = *i; 145 // FIXME: This should be generalized to more than just the AlignedAttr. 146 if (const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr)) { 147 if (Aligned->isAlignmentDependent()) { 148 // The alignment expression is not potentially evaluated. 149 EnterExpressionEvaluationContext Unevaluated(*this, 150 Sema::Unevaluated); 151 152 if (Aligned->isAlignmentExpr()) { 153 ExprResult Result = SubstExpr(Aligned->getAlignmentExpr(), 154 TemplateArgs); 155 if (!Result.isInvalid()) 156 AddAlignedAttr(Aligned->getLocation(), New, Result.takeAs<Expr>()); 157 } 158 else { 159 TypeSourceInfo *Result = SubstType(Aligned->getAlignmentType(), 160 TemplateArgs, 161 Aligned->getLocation(), 162 DeclarationName()); 163 if (Result) 164 AddAlignedAttr(Aligned->getLocation(), New, Result); 165 } 166 continue; 167 } 168 } 169 170 // FIXME: Is cloning correct for all attributes? 171 Attr *NewAttr = TmplAttr->clone(Context); 172 New->addAttr(NewAttr); 173 } 174} 175 176Decl * 177TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { 178 assert(false && "Translation units cannot be instantiated"); 179 return D; 180} 181 182Decl * 183TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { 184 assert(false && "Namespaces cannot be instantiated"); 185 return D; 186} 187 188Decl * 189TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) { 190 NamespaceAliasDecl *Inst 191 = NamespaceAliasDecl::Create(SemaRef.Context, Owner, 192 D->getNamespaceLoc(), 193 D->getAliasLoc(), 194 D->getNamespace()->getIdentifier(), 195 D->getQualifierRange(), 196 D->getQualifier(), 197 D->getTargetNameLoc(), 198 D->getNamespace()); 199 Owner->addDecl(Inst); 200 return Inst; 201} 202 203Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { 204 bool Invalid = false; 205 TypeSourceInfo *DI = D->getTypeSourceInfo(); 206 if (DI->getType()->isDependentType() || 207 DI->getType()->isVariablyModifiedType()) { 208 DI = SemaRef.SubstType(DI, TemplateArgs, 209 D->getLocation(), D->getDeclName()); 210 if (!DI) { 211 Invalid = true; 212 DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy); 213 } 214 } else { 215 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); 216 } 217 218 // Create the new typedef 219 TypedefDecl *Typedef 220 = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(), 221 D->getIdentifier(), DI); 222 if (Invalid) 223 Typedef->setInvalidDecl(); 224 225 if (const TagType *TT = DI->getType()->getAs<TagType>()) { 226 TagDecl *TD = TT->getDecl(); 227 228 // If the TagDecl that the TypedefDecl points to is an anonymous decl 229 // keep track of the TypedefDecl. 230 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 231 TD->setTypedefForAnonDecl(Typedef); 232 } 233 234 if (TypedefDecl *Prev = D->getPreviousDeclaration()) { 235 NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev, 236 TemplateArgs); 237 Typedef->setPreviousDeclaration(cast<TypedefDecl>(InstPrev)); 238 } 239 240 SemaRef.InstantiateAttrs(TemplateArgs, D, Typedef); 241 242 Typedef->setAccess(D->getAccess()); 243 Owner->addDecl(Typedef); 244 245 return Typedef; 246} 247 248/// \brief Instantiate the arguments provided as part of initialization. 249/// 250/// \returns true if an error occurred, false otherwise. 251static bool InstantiateInitializationArguments(Sema &SemaRef, 252 Expr **Args, unsigned NumArgs, 253 const MultiLevelTemplateArgumentList &TemplateArgs, 254 ASTOwningVector<Expr*> &InitArgs) { 255 for (unsigned I = 0; I != NumArgs; ++I) { 256 // When we hit the first defaulted argument, break out of the loop: 257 // we don't pass those default arguments on. 258 if (Args[I]->isDefaultArgument()) 259 break; 260 261 ExprResult Arg = SemaRef.SubstExpr(Args[I], TemplateArgs); 262 if (Arg.isInvalid()) 263 return true; 264 265 InitArgs.push_back(Arg.release()); 266 } 267 268 return false; 269} 270 271/// \brief Instantiate an initializer, breaking it into separate 272/// initialization arguments. 273/// 274/// \param S The semantic analysis object. 275/// 276/// \param Init The initializer to instantiate. 277/// 278/// \param TemplateArgs Template arguments to be substituted into the 279/// initializer. 280/// 281/// \param NewArgs Will be filled in with the instantiation arguments. 282/// 283/// \returns true if an error occurred, false otherwise 284static bool InstantiateInitializer(Sema &S, Expr *Init, 285 const MultiLevelTemplateArgumentList &TemplateArgs, 286 SourceLocation &LParenLoc, 287 ASTOwningVector<Expr*> &NewArgs, 288 SourceLocation &RParenLoc) { 289 NewArgs.clear(); 290 LParenLoc = SourceLocation(); 291 RParenLoc = SourceLocation(); 292 293 if (!Init) 294 return false; 295 296 if (CXXExprWithTemporaries *ExprTemp = dyn_cast<CXXExprWithTemporaries>(Init)) 297 Init = ExprTemp->getSubExpr(); 298 299 while (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(Init)) 300 Init = Binder->getSubExpr(); 301 302 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Init)) 303 Init = ICE->getSubExprAsWritten(); 304 305 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 306 LParenLoc = ParenList->getLParenLoc(); 307 RParenLoc = ParenList->getRParenLoc(); 308 return InstantiateInitializationArguments(S, ParenList->getExprs(), 309 ParenList->getNumExprs(), 310 TemplateArgs, NewArgs); 311 } 312 313 if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init)) { 314 if (!isa<CXXTemporaryObjectExpr>(Construct)) { 315 if (InstantiateInitializationArguments(S, 316 Construct->getArgs(), 317 Construct->getNumArgs(), 318 TemplateArgs, NewArgs)) 319 return true; 320 321 // FIXME: Fake locations! 322 LParenLoc = S.PP.getLocForEndOfToken(Init->getLocStart()); 323 RParenLoc = LParenLoc; 324 return false; 325 } 326 } 327 328 ExprResult Result = S.SubstExpr(Init, TemplateArgs); 329 if (Result.isInvalid()) 330 return true; 331 332 NewArgs.push_back(Result.takeAs<Expr>()); 333 return false; 334} 335 336Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { 337 // If this is the variable for an anonymous struct or union, 338 // instantiate the anonymous struct/union type first. 339 if (const RecordType *RecordTy = D->getType()->getAs<RecordType>()) 340 if (RecordTy->getDecl()->isAnonymousStructOrUnion()) 341 if (!VisitCXXRecordDecl(cast<CXXRecordDecl>(RecordTy->getDecl()))) 342 return 0; 343 344 // Do substitution on the type of the declaration 345 TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(), 346 TemplateArgs, 347 D->getTypeSpecStartLoc(), 348 D->getDeclName()); 349 if (!DI) 350 return 0; 351 352 if (DI->getType()->isFunctionType()) { 353 SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function) 354 << D->isStaticDataMember() << DI->getType(); 355 return 0; 356 } 357 358 // Build the instantiated declaration 359 VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, 360 D->getLocation(), D->getIdentifier(), 361 DI->getType(), DI, 362 D->getStorageClass(), 363 D->getStorageClassAsWritten()); 364 Var->setThreadSpecified(D->isThreadSpecified()); 365 Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); 366 367 // Substitute the nested name specifier, if any. 368 if (SubstQualifier(D, Var)) 369 return 0; 370 371 // If we are instantiating a static data member defined 372 // out-of-line, the instantiation will have the same lexical 373 // context (which will be a namespace scope) as the template. 374 if (D->isOutOfLine()) 375 Var->setLexicalDeclContext(D->getLexicalDeclContext()); 376 377 Var->setAccess(D->getAccess()); 378 379 if (!D->isStaticDataMember()) 380 Var->setUsed(D->isUsed(false)); 381 382 // FIXME: In theory, we could have a previous declaration for variables that 383 // are not static data members. 384 bool Redeclaration = false; 385 // FIXME: having to fake up a LookupResult is dumb. 386 LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(), 387 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 388 if (D->isStaticDataMember()) 389 SemaRef.LookupQualifiedName(Previous, Owner, false); 390 SemaRef.CheckVariableDeclaration(Var, Previous, Redeclaration); 391 392 if (D->isOutOfLine()) { 393 if (!D->isStaticDataMember()) 394 D->getLexicalDeclContext()->addDecl(Var); 395 Owner->makeDeclVisibleInContext(Var); 396 } else { 397 Owner->addDecl(Var); 398 if (Owner->isFunctionOrMethod()) 399 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Var); 400 } 401 SemaRef.InstantiateAttrs(TemplateArgs, D, Var); 402 403 // Link instantiations of static data members back to the template from 404 // which they were instantiated. 405 if (Var->isStaticDataMember()) 406 SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D, 407 TSK_ImplicitInstantiation); 408 409 if (Var->getAnyInitializer()) { 410 // We already have an initializer in the class. 411 } else if (D->getInit()) { 412 if (Var->isStaticDataMember() && !D->isOutOfLine()) 413 SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated); 414 else 415 SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 416 417 // Instantiate the initializer. 418 SourceLocation LParenLoc, RParenLoc; 419 ASTOwningVector<Expr*> InitArgs(SemaRef); 420 if (!InstantiateInitializer(SemaRef, D->getInit(), TemplateArgs, LParenLoc, 421 InitArgs, RParenLoc)) { 422 // Attach the initializer to the declaration. 423 if (D->hasCXXDirectInitializer()) { 424 // Add the direct initializer to the declaration. 425 SemaRef.AddCXXDirectInitializerToDecl(Var, 426 LParenLoc, 427 move_arg(InitArgs), 428 RParenLoc); 429 } else if (InitArgs.size() == 1) { 430 Expr *Init = InitArgs.take()[0]; 431 SemaRef.AddInitializerToDecl(Var, Init, false); 432 } else { 433 assert(InitArgs.size() == 0); 434 SemaRef.ActOnUninitializedDecl(Var, false); 435 } 436 } else { 437 // FIXME: Not too happy about invalidating the declaration 438 // because of a bogus initializer. 439 Var->setInvalidDecl(); 440 } 441 442 SemaRef.PopExpressionEvaluationContext(); 443 } else if (!Var->isStaticDataMember() || Var->isOutOfLine()) 444 SemaRef.ActOnUninitializedDecl(Var, false); 445 446 // Diagnose unused local variables. 447 if (!Var->isInvalidDecl() && Owner->isFunctionOrMethod() && !Var->isUsed()) 448 SemaRef.DiagnoseUnusedDecl(Var); 449 450 return Var; 451} 452 453Decl *TemplateDeclInstantiator::VisitAccessSpecDecl(AccessSpecDecl *D) { 454 AccessSpecDecl* AD 455 = AccessSpecDecl::Create(SemaRef.Context, D->getAccess(), Owner, 456 D->getAccessSpecifierLoc(), D->getColonLoc()); 457 Owner->addHiddenDecl(AD); 458 return AD; 459} 460 461Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { 462 bool Invalid = false; 463 TypeSourceInfo *DI = D->getTypeSourceInfo(); 464 if (DI->getType()->isDependentType() || 465 DI->getType()->isVariablyModifiedType()) { 466 DI = SemaRef.SubstType(DI, TemplateArgs, 467 D->getLocation(), D->getDeclName()); 468 if (!DI) { 469 DI = D->getTypeSourceInfo(); 470 Invalid = true; 471 } else if (DI->getType()->isFunctionType()) { 472 // C++ [temp.arg.type]p3: 473 // If a declaration acquires a function type through a type 474 // dependent on a template-parameter and this causes a 475 // declaration that does not use the syntactic form of a 476 // function declarator to have function type, the program is 477 // ill-formed. 478 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) 479 << DI->getType(); 480 Invalid = true; 481 } 482 } else { 483 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); 484 } 485 486 Expr *BitWidth = D->getBitWidth(); 487 if (Invalid) 488 BitWidth = 0; 489 else if (BitWidth) { 490 // The bit-width expression is not potentially evaluated. 491 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated); 492 493 ExprResult InstantiatedBitWidth 494 = SemaRef.SubstExpr(BitWidth, TemplateArgs); 495 if (InstantiatedBitWidth.isInvalid()) { 496 Invalid = true; 497 BitWidth = 0; 498 } else 499 BitWidth = InstantiatedBitWidth.takeAs<Expr>(); 500 } 501 502 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), 503 DI->getType(), DI, 504 cast<RecordDecl>(Owner), 505 D->getLocation(), 506 D->isMutable(), 507 BitWidth, 508 D->getTypeSpecStartLoc(), 509 D->getAccess(), 510 0); 511 if (!Field) { 512 cast<Decl>(Owner)->setInvalidDecl(); 513 return 0; 514 } 515 516 SemaRef.InstantiateAttrs(TemplateArgs, D, Field); 517 518 if (Invalid) 519 Field->setInvalidDecl(); 520 521 if (!Field->getDeclName()) { 522 // Keep track of where this decl came from. 523 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); 524 } 525 if (CXXRecordDecl *Parent= dyn_cast<CXXRecordDecl>(Field->getDeclContext())) { 526 if (Parent->isAnonymousStructOrUnion() && 527 Parent->getRedeclContext()->isFunctionOrMethod()) 528 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Field); 529 } 530 531 Field->setImplicit(D->isImplicit()); 532 Field->setAccess(D->getAccess()); 533 Owner->addDecl(Field); 534 535 return Field; 536} 537 538Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { 539 // Handle friend type expressions by simply substituting template 540 // parameters into the pattern type and checking the result. 541 if (TypeSourceInfo *Ty = D->getFriendType()) { 542 TypeSourceInfo *InstTy = 543 SemaRef.SubstType(Ty, TemplateArgs, 544 D->getLocation(), DeclarationName()); 545 if (!InstTy) 546 return 0; 547 548 FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getFriendLoc(), InstTy); 549 if (!FD) 550 return 0; 551 552 FD->setAccess(AS_public); 553 FD->setUnsupportedFriend(D->isUnsupportedFriend()); 554 Owner->addDecl(FD); 555 return FD; 556 } 557 558 NamedDecl *ND = D->getFriendDecl(); 559 assert(ND && "friend decl must be a decl or a type!"); 560 561 // All of the Visit implementations for the various potential friend 562 // declarations have to be carefully written to work for friend 563 // objects, with the most important detail being that the target 564 // decl should almost certainly not be placed in Owner. 565 Decl *NewND = Visit(ND); 566 if (!NewND) return 0; 567 568 FriendDecl *FD = 569 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), 570 cast<NamedDecl>(NewND), D->getFriendLoc()); 571 FD->setAccess(AS_public); 572 FD->setUnsupportedFriend(D->isUnsupportedFriend()); 573 Owner->addDecl(FD); 574 return FD; 575} 576 577Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { 578 Expr *AssertExpr = D->getAssertExpr(); 579 580 // The expression in a static assertion is not potentially evaluated. 581 EnterExpressionEvaluationContext Unevaluated(SemaRef, Sema::Unevaluated); 582 583 ExprResult InstantiatedAssertExpr 584 = SemaRef.SubstExpr(AssertExpr, TemplateArgs); 585 if (InstantiatedAssertExpr.isInvalid()) 586 return 0; 587 588 ExprResult Message(D->getMessage()); 589 D->getMessage()->Retain(); 590 return SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), 591 InstantiatedAssertExpr.get(), 592 Message.get()); 593} 594 595Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { 596 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, 597 D->getLocation(), D->getIdentifier(), 598 D->getTagKeywordLoc(), 599 /*PrevDecl=*/0, 600 D->isScoped(), D->isFixed()); 601 if (D->isFixed()) { 602 if (TypeSourceInfo* TI = D->getIntegerTypeSourceInfo()) { 603 // If we have type source information for the underlying type, it means it 604 // has been explicitly set by the user. Perform substitution on it before 605 // moving on. 606 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 607 Enum->setIntegerTypeSourceInfo(SemaRef.SubstType(TI, 608 TemplateArgs, 609 UnderlyingLoc, 610 DeclarationName())); 611 612 if (!Enum->getIntegerTypeSourceInfo()) 613 Enum->setIntegerType(SemaRef.Context.IntTy); 614 } 615 else { 616 assert(!D->getIntegerType()->isDependentType() 617 && "Dependent type without type source info"); 618 Enum->setIntegerType(D->getIntegerType()); 619 } 620 } 621 622 Enum->setInstantiationOfMemberEnum(D); 623 Enum->setAccess(D->getAccess()); 624 if (SubstQualifier(D, Enum)) return 0; 625 Owner->addDecl(Enum); 626 Enum->startDefinition(); 627 628 if (D->getDeclContext()->isFunctionOrMethod()) 629 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum); 630 631 llvm::SmallVector<Decl*, 4> Enumerators; 632 633 EnumConstantDecl *LastEnumConst = 0; 634 for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), 635 ECEnd = D->enumerator_end(); 636 EC != ECEnd; ++EC) { 637 // The specified value for the enumerator. 638 ExprResult Value = SemaRef.Owned((Expr *)0); 639 if (Expr *UninstValue = EC->getInitExpr()) { 640 // The enumerator's value expression is not potentially evaluated. 641 EnterExpressionEvaluationContext Unevaluated(SemaRef, 642 Sema::Unevaluated); 643 644 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); 645 } 646 647 // Drop the initial value and continue. 648 bool isInvalid = false; 649 if (Value.isInvalid()) { 650 Value = SemaRef.Owned((Expr *)0); 651 isInvalid = true; 652 } 653 654 EnumConstantDecl *EnumConst 655 = SemaRef.CheckEnumConstant(Enum, LastEnumConst, 656 EC->getLocation(), EC->getIdentifier(), 657 Value.get()); 658 659 if (isInvalid) { 660 if (EnumConst) 661 EnumConst->setInvalidDecl(); 662 Enum->setInvalidDecl(); 663 } 664 665 if (EnumConst) { 666 EnumConst->setAccess(Enum->getAccess()); 667 Enum->addDecl(EnumConst); 668 Enumerators.push_back(EnumConst); 669 LastEnumConst = EnumConst; 670 671 if (D->getDeclContext()->isFunctionOrMethod()) { 672 // If the enumeration is within a function or method, record the enum 673 // constant as a local. 674 SemaRef.CurrentInstantiationScope->InstantiatedLocal(*EC, EnumConst); 675 } 676 } 677 } 678 679 // FIXME: Fixup LBraceLoc and RBraceLoc 680 // FIXME: Empty Scope and AttributeList (required to handle attribute packed). 681 SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), 682 Enum, 683 Enumerators.data(), Enumerators.size(), 684 0, 0); 685 686 return Enum; 687} 688 689Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { 690 assert(false && "EnumConstantDecls can only occur within EnumDecls."); 691 return 0; 692} 693 694Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { 695 bool isFriend = (D->getFriendObjectKind() != Decl::FOK_None); 696 697 // Create a local instantiation scope for this class template, which 698 // will contain the instantiations of the template parameters. 699 LocalInstantiationScope Scope(SemaRef); 700 TemplateParameterList *TempParams = D->getTemplateParameters(); 701 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 702 if (!InstParams) 703 return NULL; 704 705 CXXRecordDecl *Pattern = D->getTemplatedDecl(); 706 707 // Instantiate the qualifier. We have to do this first in case 708 // we're a friend declaration, because if we are then we need to put 709 // the new declaration in the appropriate context. 710 NestedNameSpecifier *Qualifier = Pattern->getQualifier(); 711 if (Qualifier) { 712 Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier, 713 Pattern->getQualifierRange(), 714 TemplateArgs); 715 if (!Qualifier) return 0; 716 } 717 718 CXXRecordDecl *PrevDecl = 0; 719 ClassTemplateDecl *PrevClassTemplate = 0; 720 721 // If this isn't a friend, then it's a member template, in which 722 // case we just want to build the instantiation in the 723 // specialization. If it is a friend, we want to build it in 724 // the appropriate context. 725 DeclContext *DC = Owner; 726 if (isFriend) { 727 if (Qualifier) { 728 CXXScopeSpec SS; 729 SS.setScopeRep(Qualifier); 730 SS.setRange(Pattern->getQualifierRange()); 731 DC = SemaRef.computeDeclContext(SS); 732 if (!DC) return 0; 733 } else { 734 DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(), 735 Pattern->getDeclContext(), 736 TemplateArgs); 737 } 738 739 // Look for a previous declaration of the template in the owning 740 // context. 741 LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(), 742 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 743 SemaRef.LookupQualifiedName(R, DC); 744 745 if (R.isSingleResult()) { 746 PrevClassTemplate = R.getAsSingle<ClassTemplateDecl>(); 747 if (PrevClassTemplate) 748 PrevDecl = PrevClassTemplate->getTemplatedDecl(); 749 } 750 751 if (!PrevClassTemplate && Qualifier) { 752 SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope) 753 << D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC 754 << Pattern->getQualifierRange(); 755 return 0; 756 } 757 758 bool AdoptedPreviousTemplateParams = false; 759 if (PrevClassTemplate) { 760 bool Complain = true; 761 762 // HACK: libstdc++ 4.2.1 contains an ill-formed friend class 763 // template for struct std::tr1::__detail::_Map_base, where the 764 // template parameters of the friend declaration don't match the 765 // template parameters of the original declaration. In this one 766 // case, we don't complain about the ill-formed friend 767 // declaration. 768 if (isFriend && Pattern->getIdentifier() && 769 Pattern->getIdentifier()->isStr("_Map_base") && 770 DC->isNamespace() && 771 cast<NamespaceDecl>(DC)->getIdentifier() && 772 cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__detail")) { 773 DeclContext *DCParent = DC->getParent(); 774 if (DCParent->isNamespace() && 775 cast<NamespaceDecl>(DCParent)->getIdentifier() && 776 cast<NamespaceDecl>(DCParent)->getIdentifier()->isStr("tr1")) { 777 DeclContext *DCParent2 = DCParent->getParent(); 778 if (DCParent2->isNamespace() && 779 cast<NamespaceDecl>(DCParent2)->getIdentifier() && 780 cast<NamespaceDecl>(DCParent2)->getIdentifier()->isStr("std") && 781 DCParent2->getParent()->isTranslationUnit()) 782 Complain = false; 783 } 784 } 785 786 TemplateParameterList *PrevParams 787 = PrevClassTemplate->getTemplateParameters(); 788 789 // Make sure the parameter lists match. 790 if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams, 791 Complain, 792 Sema::TPL_TemplateMatch)) { 793 if (Complain) 794 return 0; 795 796 AdoptedPreviousTemplateParams = true; 797 InstParams = PrevParams; 798 } 799 800 // Do some additional validation, then merge default arguments 801 // from the existing declarations. 802 if (!AdoptedPreviousTemplateParams && 803 SemaRef.CheckTemplateParameterList(InstParams, PrevParams, 804 Sema::TPC_ClassTemplate)) 805 return 0; 806 } 807 } 808 809 CXXRecordDecl *RecordInst 810 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC, 811 Pattern->getLocation(), Pattern->getIdentifier(), 812 Pattern->getTagKeywordLoc(), PrevDecl, 813 /*DelayTypeCreation=*/true); 814 815 if (Qualifier) 816 RecordInst->setQualifierInfo(Qualifier, Pattern->getQualifierRange()); 817 818 ClassTemplateDecl *Inst 819 = ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(), 820 D->getIdentifier(), InstParams, RecordInst, 821 PrevClassTemplate); 822 RecordInst->setDescribedClassTemplate(Inst); 823 824 if (isFriend) { 825 if (PrevClassTemplate) 826 Inst->setAccess(PrevClassTemplate->getAccess()); 827 else 828 Inst->setAccess(D->getAccess()); 829 830 Inst->setObjectOfFriendDecl(PrevClassTemplate != 0); 831 // TODO: do we want to track the instantiation progeny of this 832 // friend target decl? 833 } else { 834 Inst->setAccess(D->getAccess()); 835 Inst->setInstantiatedFromMemberTemplate(D); 836 } 837 838 // Trigger creation of the type for the instantiation. 839 SemaRef.Context.getInjectedClassNameType(RecordInst, 840 Inst->getInjectedClassNameSpecialization()); 841 842 // Finish handling of friends. 843 if (isFriend) { 844 DC->makeDeclVisibleInContext(Inst, /*Recoverable*/ false); 845 return Inst; 846 } 847 848 Owner->addDecl(Inst); 849 850 // Instantiate all of the partial specializations of this member class 851 // template. 852 llvm::SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs; 853 D->getPartialSpecializations(PartialSpecs); 854 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) 855 InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]); 856 857 return Inst; 858} 859 860Decl * 861TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( 862 ClassTemplatePartialSpecializationDecl *D) { 863 ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); 864 865 // Lookup the already-instantiated declaration in the instantiation 866 // of the class template and return that. 867 DeclContext::lookup_result Found 868 = Owner->lookup(ClassTemplate->getDeclName()); 869 if (Found.first == Found.second) 870 return 0; 871 872 ClassTemplateDecl *InstClassTemplate 873 = dyn_cast<ClassTemplateDecl>(*Found.first); 874 if (!InstClassTemplate) 875 return 0; 876 877 return InstClassTemplate->findPartialSpecInstantiatedFromMember(D); 878} 879 880Decl * 881TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { 882 // Create a local instantiation scope for this function template, which 883 // will contain the instantiations of the template parameters and then get 884 // merged with the local instantiation scope for the function template 885 // itself. 886 LocalInstantiationScope Scope(SemaRef); 887 888 TemplateParameterList *TempParams = D->getTemplateParameters(); 889 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 890 if (!InstParams) 891 return NULL; 892 893 FunctionDecl *Instantiated = 0; 894 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl())) 895 Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod, 896 InstParams)); 897 else 898 Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl( 899 D->getTemplatedDecl(), 900 InstParams)); 901 902 if (!Instantiated) 903 return 0; 904 905 Instantiated->setAccess(D->getAccess()); 906 907 // Link the instantiated function template declaration to the function 908 // template from which it was instantiated. 909 FunctionTemplateDecl *InstTemplate 910 = Instantiated->getDescribedFunctionTemplate(); 911 InstTemplate->setAccess(D->getAccess()); 912 assert(InstTemplate && 913 "VisitFunctionDecl/CXXMethodDecl didn't create a template!"); 914 915 bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None); 916 917 // Link the instantiation back to the pattern *unless* this is a 918 // non-definition friend declaration. 919 if (!InstTemplate->getInstantiatedFromMemberTemplate() && 920 !(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition())) 921 InstTemplate->setInstantiatedFromMemberTemplate(D); 922 923 // Make declarations visible in the appropriate context. 924 if (!isFriend) 925 Owner->addDecl(InstTemplate); 926 927 return InstTemplate; 928} 929 930Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { 931 CXXRecordDecl *PrevDecl = 0; 932 if (D->isInjectedClassName()) 933 PrevDecl = cast<CXXRecordDecl>(Owner); 934 else if (D->getPreviousDeclaration()) { 935 NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(), 936 D->getPreviousDeclaration(), 937 TemplateArgs); 938 if (!Prev) return 0; 939 PrevDecl = cast<CXXRecordDecl>(Prev); 940 } 941 942 CXXRecordDecl *Record 943 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, 944 D->getLocation(), D->getIdentifier(), 945 D->getTagKeywordLoc(), PrevDecl); 946 947 // Substitute the nested name specifier, if any. 948 if (SubstQualifier(D, Record)) 949 return 0; 950 951 Record->setImplicit(D->isImplicit()); 952 // FIXME: Check against AS_none is an ugly hack to work around the issue that 953 // the tag decls introduced by friend class declarations don't have an access 954 // specifier. Remove once this area of the code gets sorted out. 955 if (D->getAccess() != AS_none) 956 Record->setAccess(D->getAccess()); 957 if (!D->isInjectedClassName()) 958 Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); 959 960 // If the original function was part of a friend declaration, 961 // inherit its namespace state. 962 if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) 963 Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); 964 965 // Make sure that anonymous structs and unions are recorded. 966 if (D->isAnonymousStructOrUnion()) { 967 Record->setAnonymousStructOrUnion(true); 968 if (Record->getDeclContext()->getRedeclContext()->isFunctionOrMethod()) 969 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record); 970 } 971 972 Owner->addDecl(Record); 973 return Record; 974} 975 976/// Normal class members are of more specific types and therefore 977/// don't make it here. This function serves two purposes: 978/// 1) instantiating function templates 979/// 2) substituting friend declarations 980/// FIXME: preserve function definitions in case #2 981Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, 982 TemplateParameterList *TemplateParams) { 983 // Check whether there is already a function template specialization for 984 // this declaration. 985 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 986 void *InsertPos = 0; 987 if (FunctionTemplate && !TemplateParams) { 988 std::pair<const TemplateArgument *, unsigned> Innermost 989 = TemplateArgs.getInnermost(); 990 991 FunctionDecl *SpecFunc 992 = FunctionTemplate->findSpecialization(Innermost.first, Innermost.second, 993 InsertPos); 994 995 // If we already have a function template specialization, return it. 996 if (SpecFunc) 997 return SpecFunc; 998 } 999 1000 bool isFriend; 1001 if (FunctionTemplate) 1002 isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); 1003 else 1004 isFriend = (D->getFriendObjectKind() != Decl::FOK_None); 1005 1006 bool MergeWithParentScope = (TemplateParams != 0) || 1007 Owner->isFunctionOrMethod() || 1008 !(isa<Decl>(Owner) && 1009 cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod()); 1010 LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); 1011 1012 llvm::SmallVector<ParmVarDecl *, 4> Params; 1013 TypeSourceInfo *TInfo = D->getTypeSourceInfo(); 1014 TInfo = SubstFunctionType(D, Params); 1015 if (!TInfo) 1016 return 0; 1017 QualType T = TInfo->getType(); 1018 1019 NestedNameSpecifier *Qualifier = D->getQualifier(); 1020 if (Qualifier) { 1021 Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier, 1022 D->getQualifierRange(), 1023 TemplateArgs); 1024 if (!Qualifier) return 0; 1025 } 1026 1027 // If we're instantiating a local function declaration, put the result 1028 // in the owner; otherwise we need to find the instantiated context. 1029 DeclContext *DC; 1030 if (D->getDeclContext()->isFunctionOrMethod()) 1031 DC = Owner; 1032 else if (isFriend && Qualifier) { 1033 CXXScopeSpec SS; 1034 SS.setScopeRep(Qualifier); 1035 SS.setRange(D->getQualifierRange()); 1036 DC = SemaRef.computeDeclContext(SS); 1037 if (!DC) return 0; 1038 } else { 1039 DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(), 1040 TemplateArgs); 1041 } 1042 1043 FunctionDecl *Function = 1044 FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(), 1045 D->getDeclName(), T, TInfo, 1046 D->getStorageClass(), D->getStorageClassAsWritten(), 1047 D->isInlineSpecified(), D->hasWrittenPrototype()); 1048 1049 if (Qualifier) 1050 Function->setQualifierInfo(Qualifier, D->getQualifierRange()); 1051 1052 DeclContext *LexicalDC = Owner; 1053 if (!isFriend && D->isOutOfLine()) { 1054 assert(D->getDeclContext()->isFileContext()); 1055 LexicalDC = D->getDeclContext(); 1056 } 1057 1058 Function->setLexicalDeclContext(LexicalDC); 1059 1060 // Attach the parameters 1061 for (unsigned P = 0; P < Params.size(); ++P) 1062 if (Params[P]) 1063 Params[P]->setOwningFunction(Function); 1064 Function->setParams(Params.data(), Params.size()); 1065 1066 SourceLocation InstantiateAtPOI; 1067 if (TemplateParams) { 1068 // Our resulting instantiation is actually a function template, since we 1069 // are substituting only the outer template parameters. For example, given 1070 // 1071 // template<typename T> 1072 // struct X { 1073 // template<typename U> friend void f(T, U); 1074 // }; 1075 // 1076 // X<int> x; 1077 // 1078 // We are instantiating the friend function template "f" within X<int>, 1079 // which means substituting int for T, but leaving "f" as a friend function 1080 // template. 1081 // Build the function template itself. 1082 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC, 1083 Function->getLocation(), 1084 Function->getDeclName(), 1085 TemplateParams, Function); 1086 Function->setDescribedFunctionTemplate(FunctionTemplate); 1087 1088 FunctionTemplate->setLexicalDeclContext(LexicalDC); 1089 1090 if (isFriend && D->isThisDeclarationADefinition()) { 1091 // TODO: should we remember this connection regardless of whether 1092 // the friend declaration provided a body? 1093 FunctionTemplate->setInstantiatedFromMemberTemplate( 1094 D->getDescribedFunctionTemplate()); 1095 } 1096 } else if (FunctionTemplate) { 1097 // Record this function template specialization. 1098 std::pair<const TemplateArgument *, unsigned> Innermost 1099 = TemplateArgs.getInnermost(); 1100 Function->setFunctionTemplateSpecialization(FunctionTemplate, 1101 new (SemaRef.Context) TemplateArgumentList(SemaRef.Context, 1102 Innermost.first, 1103 Innermost.second), 1104 InsertPos); 1105 } else if (isFriend && D->isThisDeclarationADefinition()) { 1106 // TODO: should we remember this connection regardless of whether 1107 // the friend declaration provided a body? 1108 Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 1109 } 1110 1111 if (InitFunctionInstantiation(Function, D)) 1112 Function->setInvalidDecl(); 1113 1114 bool Redeclaration = false; 1115 bool OverloadableAttrRequired = false; 1116 bool isExplicitSpecialization = false; 1117 1118 LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(), 1119 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 1120 1121 if (DependentFunctionTemplateSpecializationInfo *Info 1122 = D->getDependentSpecializationInfo()) { 1123 assert(isFriend && "non-friend has dependent specialization info?"); 1124 1125 // This needs to be set now for future sanity. 1126 Function->setObjectOfFriendDecl(/*HasPrevious*/ true); 1127 1128 // Instantiate the explicit template arguments. 1129 TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(), 1130 Info->getRAngleLoc()); 1131 for (unsigned I = 0, E = Info->getNumTemplateArgs(); I != E; ++I) { 1132 TemplateArgumentLoc Loc; 1133 if (SemaRef.Subst(Info->getTemplateArg(I), Loc, TemplateArgs)) 1134 return 0; 1135 1136 ExplicitArgs.addArgument(Loc); 1137 } 1138 1139 // Map the candidate templates to their instantiations. 1140 for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) { 1141 Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(), 1142 Info->getTemplate(I), 1143 TemplateArgs); 1144 if (!Temp) return 0; 1145 1146 Previous.addDecl(cast<FunctionTemplateDecl>(Temp)); 1147 } 1148 1149 if (SemaRef.CheckFunctionTemplateSpecialization(Function, 1150 &ExplicitArgs, 1151 Previous)) 1152 Function->setInvalidDecl(); 1153 1154 isExplicitSpecialization = true; 1155 1156 } else if (TemplateParams || !FunctionTemplate) { 1157 // Look only into the namespace where the friend would be declared to 1158 // find a previous declaration. This is the innermost enclosing namespace, 1159 // as described in ActOnFriendFunctionDecl. 1160 SemaRef.LookupQualifiedName(Previous, DC); 1161 1162 // In C++, the previous declaration we find might be a tag type 1163 // (class or enum). In this case, the new declaration will hide the 1164 // tag type. Note that this does does not apply if we're declaring a 1165 // typedef (C++ [dcl.typedef]p4). 1166 if (Previous.isSingleTagDecl()) 1167 Previous.clear(); 1168 } 1169 1170 SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous, 1171 isExplicitSpecialization, Redeclaration, 1172 /*FIXME:*/OverloadableAttrRequired); 1173 1174 NamedDecl *PrincipalDecl = (TemplateParams 1175 ? cast<NamedDecl>(FunctionTemplate) 1176 : Function); 1177 1178 // If the original function was part of a friend declaration, 1179 // inherit its namespace state and add it to the owner. 1180 if (isFriend) { 1181 NamedDecl *PrevDecl; 1182 if (TemplateParams) 1183 PrevDecl = FunctionTemplate->getPreviousDeclaration(); 1184 else 1185 PrevDecl = Function->getPreviousDeclaration(); 1186 1187 PrincipalDecl->setObjectOfFriendDecl(PrevDecl != 0); 1188 DC->makeDeclVisibleInContext(PrincipalDecl, /*Recoverable=*/ false); 1189 1190 bool queuedInstantiation = false; 1191 1192 if (!SemaRef.getLangOptions().CPlusPlus0x && 1193 D->isThisDeclarationADefinition()) { 1194 // Check for a function body. 1195 const FunctionDecl *Definition = 0; 1196 if (Function->hasBody(Definition) && 1197 Definition->getTemplateSpecializationKind() == TSK_Undeclared) { 1198 SemaRef.Diag(Function->getLocation(), diag::err_redefinition) 1199 << Function->getDeclName(); 1200 SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition); 1201 Function->setInvalidDecl(); 1202 } 1203 // Check for redefinitions due to other instantiations of this or 1204 // a similar friend function. 1205 else for (FunctionDecl::redecl_iterator R = Function->redecls_begin(), 1206 REnd = Function->redecls_end(); 1207 R != REnd; ++R) { 1208 if (*R == Function) 1209 continue; 1210 switch (R->getFriendObjectKind()) { 1211 case Decl::FOK_None: 1212 if (!queuedInstantiation && R->isUsed(false)) { 1213 if (MemberSpecializationInfo *MSInfo 1214 = Function->getMemberSpecializationInfo()) { 1215 if (MSInfo->getPointOfInstantiation().isInvalid()) { 1216 SourceLocation Loc = R->getLocation(); // FIXME 1217 MSInfo->setPointOfInstantiation(Loc); 1218 SemaRef.PendingLocalImplicitInstantiations.push_back( 1219 std::make_pair(Function, Loc)); 1220 queuedInstantiation = true; 1221 } 1222 } 1223 } 1224 break; 1225 default: 1226 if (const FunctionDecl *RPattern 1227 = R->getTemplateInstantiationPattern()) 1228 if (RPattern->hasBody(RPattern)) { 1229 SemaRef.Diag(Function->getLocation(), diag::err_redefinition) 1230 << Function->getDeclName(); 1231 SemaRef.Diag(R->getLocation(), diag::note_previous_definition); 1232 Function->setInvalidDecl(); 1233 break; 1234 } 1235 } 1236 } 1237 } 1238 } 1239 1240 if (Function->isOverloadedOperator() && !DC->isRecord() && 1241 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 1242 PrincipalDecl->setNonMemberOperator(); 1243 1244 return Function; 1245} 1246 1247Decl * 1248TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, 1249 TemplateParameterList *TemplateParams) { 1250 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); 1251 void *InsertPos = 0; 1252 if (FunctionTemplate && !TemplateParams) { 1253 // We are creating a function template specialization from a function 1254 // template. Check whether there is already a function template 1255 // specialization for this particular set of template arguments. 1256 std::pair<const TemplateArgument *, unsigned> Innermost 1257 = TemplateArgs.getInnermost(); 1258 1259 FunctionDecl *SpecFunc 1260 = FunctionTemplate->findSpecialization(Innermost.first, Innermost.second, 1261 InsertPos); 1262 1263 // If we already have a function template specialization, return it. 1264 if (SpecFunc) 1265 return SpecFunc; 1266 } 1267 1268 bool isFriend; 1269 if (FunctionTemplate) 1270 isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); 1271 else 1272 isFriend = (D->getFriendObjectKind() != Decl::FOK_None); 1273 1274 bool MergeWithParentScope = (TemplateParams != 0) || 1275 !(isa<Decl>(Owner) && 1276 cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod()); 1277 LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); 1278 1279 // Instantiate enclosing template arguments for friends. 1280 llvm::SmallVector<TemplateParameterList *, 4> TempParamLists; 1281 unsigned NumTempParamLists = 0; 1282 if (isFriend && (NumTempParamLists = D->getNumTemplateParameterLists())) { 1283 TempParamLists.set_size(NumTempParamLists); 1284 for (unsigned I = 0; I != NumTempParamLists; ++I) { 1285 TemplateParameterList *TempParams = D->getTemplateParameterList(I); 1286 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 1287 if (!InstParams) 1288 return NULL; 1289 TempParamLists[I] = InstParams; 1290 } 1291 } 1292 1293 llvm::SmallVector<ParmVarDecl *, 4> Params; 1294 TypeSourceInfo *TInfo = D->getTypeSourceInfo(); 1295 TInfo = SubstFunctionType(D, Params); 1296 if (!TInfo) 1297 return 0; 1298 QualType T = TInfo->getType(); 1299 1300 // \brief If the type of this function is not *directly* a function 1301 // type, then we're instantiating the a function that was declared 1302 // via a typedef, e.g., 1303 // 1304 // typedef int functype(int, int); 1305 // functype func; 1306 // 1307 // In this case, we'll just go instantiate the ParmVarDecls that we 1308 // synthesized in the method declaration. 1309 if (!isa<FunctionProtoType>(T)) { 1310 assert(!Params.size() && "Instantiating type could not yield parameters"); 1311 for (unsigned I = 0, N = D->getNumParams(); I != N; ++I) { 1312 ParmVarDecl *P = SemaRef.SubstParmVarDecl(D->getParamDecl(I), 1313 TemplateArgs); 1314 if (!P) 1315 return 0; 1316 1317 Params.push_back(P); 1318 } 1319 } 1320 1321 NestedNameSpecifier *Qualifier = D->getQualifier(); 1322 if (Qualifier) { 1323 Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier, 1324 D->getQualifierRange(), 1325 TemplateArgs); 1326 if (!Qualifier) return 0; 1327 } 1328 1329 DeclContext *DC = Owner; 1330 if (isFriend) { 1331 if (Qualifier) { 1332 CXXScopeSpec SS; 1333 SS.setScopeRep(Qualifier); 1334 SS.setRange(D->getQualifierRange()); 1335 DC = SemaRef.computeDeclContext(SS); 1336 1337 if (DC && SemaRef.RequireCompleteDeclContext(SS, DC)) 1338 return 0; 1339 } else { 1340 DC = SemaRef.FindInstantiatedContext(D->getLocation(), 1341 D->getDeclContext(), 1342 TemplateArgs); 1343 } 1344 if (!DC) return 0; 1345 } 1346 1347 // Build the instantiated method declaration. 1348 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1349 CXXMethodDecl *Method = 0; 1350 1351 DeclarationNameInfo NameInfo 1352 = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs); 1353 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { 1354 Method = CXXConstructorDecl::Create(SemaRef.Context, Record, 1355 NameInfo, T, TInfo, 1356 Constructor->isExplicit(), 1357 Constructor->isInlineSpecified(), 1358 false); 1359 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) { 1360 Method = CXXDestructorDecl::Create(SemaRef.Context, Record, 1361 NameInfo, T, 1362 Destructor->isInlineSpecified(), 1363 false); 1364 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) { 1365 Method = CXXConversionDecl::Create(SemaRef.Context, Record, 1366 NameInfo, T, TInfo, 1367 Conversion->isInlineSpecified(), 1368 Conversion->isExplicit()); 1369 } else { 1370 Method = CXXMethodDecl::Create(SemaRef.Context, Record, 1371 NameInfo, T, TInfo, 1372 D->isStatic(), 1373 D->getStorageClassAsWritten(), 1374 D->isInlineSpecified()); 1375 } 1376 1377 if (Qualifier) 1378 Method->setQualifierInfo(Qualifier, D->getQualifierRange()); 1379 1380 if (TemplateParams) { 1381 // Our resulting instantiation is actually a function template, since we 1382 // are substituting only the outer template parameters. For example, given 1383 // 1384 // template<typename T> 1385 // struct X { 1386 // template<typename U> void f(T, U); 1387 // }; 1388 // 1389 // X<int> x; 1390 // 1391 // We are instantiating the member template "f" within X<int>, which means 1392 // substituting int for T, but leaving "f" as a member function template. 1393 // Build the function template itself. 1394 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, 1395 Method->getLocation(), 1396 Method->getDeclName(), 1397 TemplateParams, Method); 1398 if (isFriend) { 1399 FunctionTemplate->setLexicalDeclContext(Owner); 1400 FunctionTemplate->setObjectOfFriendDecl(true); 1401 } else if (D->isOutOfLine()) 1402 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); 1403 Method->setDescribedFunctionTemplate(FunctionTemplate); 1404 } else if (FunctionTemplate) { 1405 // Record this function template specialization. 1406 std::pair<const TemplateArgument *, unsigned> Innermost 1407 = TemplateArgs.getInnermost(); 1408 Method->setFunctionTemplateSpecialization(FunctionTemplate, 1409 new (SemaRef.Context) TemplateArgumentList(SemaRef.Context, 1410 Innermost.first, 1411 Innermost.second), 1412 InsertPos); 1413 } else if (!isFriend) { 1414 // Record that this is an instantiation of a member function. 1415 Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); 1416 } 1417 1418 // If we are instantiating a member function defined 1419 // out-of-line, the instantiation will have the same lexical 1420 // context (which will be a namespace scope) as the template. 1421 if (isFriend) { 1422 if (NumTempParamLists) 1423 Method->setTemplateParameterListsInfo(SemaRef.Context, 1424 NumTempParamLists, 1425 TempParamLists.data()); 1426 1427 Method->setLexicalDeclContext(Owner); 1428 Method->setObjectOfFriendDecl(true); 1429 } else if (D->isOutOfLine()) 1430 Method->setLexicalDeclContext(D->getLexicalDeclContext()); 1431 1432 // Attach the parameters 1433 for (unsigned P = 0; P < Params.size(); ++P) 1434 Params[P]->setOwningFunction(Method); 1435 Method->setParams(Params.data(), Params.size()); 1436 1437 if (InitMethodInstantiation(Method, D)) 1438 Method->setInvalidDecl(); 1439 1440 LookupResult Previous(SemaRef, NameInfo, Sema::LookupOrdinaryName, 1441 Sema::ForRedeclaration); 1442 1443 if (!FunctionTemplate || TemplateParams || isFriend) { 1444 SemaRef.LookupQualifiedName(Previous, Record); 1445 1446 // In C++, the previous declaration we find might be a tag type 1447 // (class or enum). In this case, the new declaration will hide the 1448 // tag type. Note that this does does not apply if we're declaring a 1449 // typedef (C++ [dcl.typedef]p4). 1450 if (Previous.isSingleTagDecl()) 1451 Previous.clear(); 1452 } 1453 1454 bool Redeclaration = false; 1455 bool OverloadableAttrRequired = false; 1456 SemaRef.CheckFunctionDeclaration(0, Method, Previous, false, Redeclaration, 1457 /*FIXME:*/OverloadableAttrRequired); 1458 1459 if (D->isPure()) 1460 SemaRef.CheckPureMethod(Method, SourceRange()); 1461 1462 Method->setAccess(D->getAccess()); 1463 1464 if (FunctionTemplate) { 1465 // If there's a function template, let our caller handle it. 1466 } else if (Method->isInvalidDecl() && !Previous.empty()) { 1467 // Don't hide a (potentially) valid declaration with an invalid one. 1468 } else { 1469 NamedDecl *DeclToAdd = (TemplateParams 1470 ? cast<NamedDecl>(FunctionTemplate) 1471 : Method); 1472 if (isFriend) 1473 Record->makeDeclVisibleInContext(DeclToAdd); 1474 else 1475 Owner->addDecl(DeclToAdd); 1476 } 1477 1478 return Method; 1479} 1480 1481Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { 1482 return VisitCXXMethodDecl(D); 1483} 1484 1485Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { 1486 return VisitCXXMethodDecl(D); 1487} 1488 1489Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { 1490 return VisitCXXMethodDecl(D); 1491} 1492 1493ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { 1494 return SemaRef.SubstParmVarDecl(D, TemplateArgs); 1495} 1496 1497Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( 1498 TemplateTypeParmDecl *D) { 1499 // TODO: don't always clone when decls are refcounted. 1500 const Type* T = D->getTypeForDecl(); 1501 assert(T->isTemplateTypeParmType()); 1502 const TemplateTypeParmType *TTPT = T->getAs<TemplateTypeParmType>(); 1503 1504 TemplateTypeParmDecl *Inst = 1505 TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1506 TTPT->getDepth() - TemplateArgs.getNumLevels(), 1507 TTPT->getIndex(),TTPT->getName(), 1508 D->wasDeclaredWithTypename(), 1509 D->isParameterPack()); 1510 1511 if (D->hasDefaultArgument()) 1512 Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); 1513 1514 // Introduce this template parameter's instantiation into the instantiation 1515 // scope. 1516 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst); 1517 1518 return Inst; 1519} 1520 1521Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( 1522 NonTypeTemplateParmDecl *D) { 1523 // Substitute into the type of the non-type template parameter. 1524 QualType T; 1525 TypeSourceInfo *DI = D->getTypeSourceInfo(); 1526 if (DI) { 1527 DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), 1528 D->getDeclName()); 1529 if (DI) T = DI->getType(); 1530 } else { 1531 T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(), 1532 D->getDeclName()); 1533 DI = 0; 1534 } 1535 if (T.isNull()) 1536 return 0; 1537 1538 // Check that this type is acceptable for a non-type template parameter. 1539 bool Invalid = false; 1540 T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation()); 1541 if (T.isNull()) { 1542 T = SemaRef.Context.IntTy; 1543 Invalid = true; 1544 } 1545 1546 NonTypeTemplateParmDecl *Param 1547 = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1548 D->getDepth() - TemplateArgs.getNumLevels(), 1549 D->getPosition(), D->getIdentifier(), T, 1550 DI); 1551 if (Invalid) 1552 Param->setInvalidDecl(); 1553 1554 Param->setDefaultArgument(D->getDefaultArgument(), false); 1555 1556 // Introduce this template parameter's instantiation into the instantiation 1557 // scope. 1558 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 1559 return Param; 1560} 1561 1562Decl * 1563TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( 1564 TemplateTemplateParmDecl *D) { 1565 // Instantiate the template parameter list of the template template parameter. 1566 TemplateParameterList *TempParams = D->getTemplateParameters(); 1567 TemplateParameterList *InstParams; 1568 { 1569 // Perform the actual substitution of template parameters within a new, 1570 // local instantiation scope. 1571 LocalInstantiationScope Scope(SemaRef); 1572 InstParams = SubstTemplateParams(TempParams); 1573 if (!InstParams) 1574 return NULL; 1575 } 1576 1577 // Build the template template parameter. 1578 TemplateTemplateParmDecl *Param 1579 = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1580 D->getDepth() - TemplateArgs.getNumLevels(), 1581 D->getPosition(), D->getIdentifier(), 1582 InstParams); 1583 Param->setDefaultArgument(D->getDefaultArgument(), false); 1584 1585 // Introduce this template parameter's instantiation into the instantiation 1586 // scope. 1587 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); 1588 1589 return Param; 1590} 1591 1592Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) { 1593 // Using directives are never dependent, so they require no explicit 1594 1595 UsingDirectiveDecl *Inst 1596 = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(), 1597 D->getNamespaceKeyLocation(), 1598 D->getQualifierRange(), D->getQualifier(), 1599 D->getIdentLocation(), 1600 D->getNominatedNamespace(), 1601 D->getCommonAncestor()); 1602 Owner->addDecl(Inst); 1603 return Inst; 1604} 1605 1606Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { 1607 1608 // The nested name specifier may be dependent, for example 1609 // template <typename T> struct t { 1610 // struct s1 { T f1(); }; 1611 // struct s2 : s1 { using s1::f1; }; 1612 // }; 1613 // template struct t<int>; 1614 // Here, in using s1::f1, s1 refers to t<T>::s1; 1615 // we need to substitute for t<int>::s1. 1616 NestedNameSpecifier *NNS = 1617 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameDecl(), 1618 D->getNestedNameRange(), 1619 TemplateArgs); 1620 if (!NNS) 1621 return 0; 1622 1623 // The name info is non-dependent, so no transformation 1624 // is required. 1625 DeclarationNameInfo NameInfo = D->getNameInfo(); 1626 1627 // We only need to do redeclaration lookups if we're in a class 1628 // scope (in fact, it's not really even possible in non-class 1629 // scopes). 1630 bool CheckRedeclaration = Owner->isRecord(); 1631 1632 LookupResult Prev(SemaRef, NameInfo, Sema::LookupUsingDeclName, 1633 Sema::ForRedeclaration); 1634 1635 UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner, 1636 D->getNestedNameRange(), 1637 D->getUsingLocation(), 1638 NNS, 1639 NameInfo, 1640 D->isTypeName()); 1641 1642 CXXScopeSpec SS; 1643 SS.setScopeRep(NNS); 1644 SS.setRange(D->getNestedNameRange()); 1645 1646 if (CheckRedeclaration) { 1647 Prev.setHideTags(false); 1648 SemaRef.LookupQualifiedName(Prev, Owner); 1649 1650 // Check for invalid redeclarations. 1651 if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(), 1652 D->isTypeName(), SS, 1653 D->getLocation(), Prev)) 1654 NewUD->setInvalidDecl(); 1655 1656 } 1657 1658 if (!NewUD->isInvalidDecl() && 1659 SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS, 1660 D->getLocation())) 1661 NewUD->setInvalidDecl(); 1662 1663 SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D); 1664 NewUD->setAccess(D->getAccess()); 1665 Owner->addDecl(NewUD); 1666 1667 // Don't process the shadow decls for an invalid decl. 1668 if (NewUD->isInvalidDecl()) 1669 return NewUD; 1670 1671 bool isFunctionScope = Owner->isFunctionOrMethod(); 1672 1673 // Process the shadow decls. 1674 for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end(); 1675 I != E; ++I) { 1676 UsingShadowDecl *Shadow = *I; 1677 NamedDecl *InstTarget = 1678 cast<NamedDecl>(SemaRef.FindInstantiatedDecl(Shadow->getLocation(), 1679 Shadow->getTargetDecl(), 1680 TemplateArgs)); 1681 1682 if (CheckRedeclaration && 1683 SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev)) 1684 continue; 1685 1686 UsingShadowDecl *InstShadow 1687 = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget); 1688 SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow); 1689 1690 if (isFunctionScope) 1691 SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow); 1692 } 1693 1694 return NewUD; 1695} 1696 1697Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) { 1698 // Ignore these; we handle them in bulk when processing the UsingDecl. 1699 return 0; 1700} 1701 1702Decl * TemplateDeclInstantiator 1703 ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) { 1704 NestedNameSpecifier *NNS = 1705 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 1706 D->getTargetNestedNameRange(), 1707 TemplateArgs); 1708 if (!NNS) 1709 return 0; 1710 1711 CXXScopeSpec SS; 1712 SS.setRange(D->getTargetNestedNameRange()); 1713 SS.setScopeRep(NNS); 1714 1715 // Since NameInfo refers to a typename, it cannot be a C++ special name. 1716 // Hence, no tranformation is required for it. 1717 DeclarationNameInfo NameInfo(D->getDeclName(), D->getLocation()); 1718 NamedDecl *UD = 1719 SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), 1720 D->getUsingLoc(), SS, NameInfo, 0, 1721 /*instantiation*/ true, 1722 /*typename*/ true, D->getTypenameLoc()); 1723 if (UD) 1724 SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D); 1725 1726 return UD; 1727} 1728 1729Decl * TemplateDeclInstantiator 1730 ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) { 1731 NestedNameSpecifier *NNS = 1732 SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), 1733 D->getTargetNestedNameRange(), 1734 TemplateArgs); 1735 if (!NNS) 1736 return 0; 1737 1738 CXXScopeSpec SS; 1739 SS.setRange(D->getTargetNestedNameRange()); 1740 SS.setScopeRep(NNS); 1741 1742 DeclarationNameInfo NameInfo 1743 = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs); 1744 1745 NamedDecl *UD = 1746 SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), 1747 D->getUsingLoc(), SS, NameInfo, 0, 1748 /*instantiation*/ true, 1749 /*typename*/ false, SourceLocation()); 1750 if (UD) 1751 SemaRef.Context.setInstantiatedFromUsingDecl(cast<UsingDecl>(UD), D); 1752 1753 return UD; 1754} 1755 1756Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, 1757 const MultiLevelTemplateArgumentList &TemplateArgs) { 1758 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); 1759 if (D->isInvalidDecl()) 1760 return 0; 1761 1762 return Instantiator.Visit(D); 1763} 1764 1765/// \brief Instantiates a nested template parameter list in the current 1766/// instantiation context. 1767/// 1768/// \param L The parameter list to instantiate 1769/// 1770/// \returns NULL if there was an error 1771TemplateParameterList * 1772TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { 1773 // Get errors for all the parameters before bailing out. 1774 bool Invalid = false; 1775 1776 unsigned N = L->size(); 1777 typedef llvm::SmallVector<NamedDecl *, 8> ParamVector; 1778 ParamVector Params; 1779 Params.reserve(N); 1780 for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); 1781 PI != PE; ++PI) { 1782 NamedDecl *D = cast_or_null<NamedDecl>(Visit(*PI)); 1783 Params.push_back(D); 1784 Invalid = Invalid || !D || D->isInvalidDecl(); 1785 } 1786 1787 // Clean up if we had an error. 1788 if (Invalid) 1789 return NULL; 1790 1791 TemplateParameterList *InstL 1792 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), 1793 L->getLAngleLoc(), &Params.front(), N, 1794 L->getRAngleLoc()); 1795 return InstL; 1796} 1797 1798/// \brief Instantiate the declaration of a class template partial 1799/// specialization. 1800/// 1801/// \param ClassTemplate the (instantiated) class template that is partially 1802// specialized by the instantiation of \p PartialSpec. 1803/// 1804/// \param PartialSpec the (uninstantiated) class template partial 1805/// specialization that we are instantiating. 1806/// 1807/// \returns true if there was an error, false otherwise. 1808bool 1809TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( 1810 ClassTemplateDecl *ClassTemplate, 1811 ClassTemplatePartialSpecializationDecl *PartialSpec) { 1812 // Create a local instantiation scope for this class template partial 1813 // specialization, which will contain the instantiations of the template 1814 // parameters. 1815 LocalInstantiationScope Scope(SemaRef); 1816 1817 // Substitute into the template parameters of the class template partial 1818 // specialization. 1819 TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); 1820 TemplateParameterList *InstParams = SubstTemplateParams(TempParams); 1821 if (!InstParams) 1822 return true; 1823 1824 // Substitute into the template arguments of the class template partial 1825 // specialization. 1826 const TemplateArgumentLoc *PartialSpecTemplateArgs 1827 = PartialSpec->getTemplateArgsAsWritten(); 1828 unsigned N = PartialSpec->getNumTemplateArgsAsWritten(); 1829 1830 TemplateArgumentListInfo InstTemplateArgs; // no angle locations 1831 for (unsigned I = 0; I != N; ++I) { 1832 TemplateArgumentLoc Loc; 1833 if (SemaRef.Subst(PartialSpecTemplateArgs[I], Loc, TemplateArgs)) 1834 return true; 1835 InstTemplateArgs.addArgument(Loc); 1836 } 1837 1838 1839 // Check that the template argument list is well-formed for this 1840 // class template. 1841 TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(), 1842 InstTemplateArgs.size()); 1843 if (SemaRef.CheckTemplateArgumentList(ClassTemplate, 1844 PartialSpec->getLocation(), 1845 InstTemplateArgs, 1846 false, 1847 Converted)) 1848 return true; 1849 1850 // Figure out where to insert this class template partial specialization 1851 // in the member template's set of class template partial specializations. 1852 void *InsertPos = 0; 1853 ClassTemplateSpecializationDecl *PrevDecl 1854 = ClassTemplate->findPartialSpecialization(Converted.getFlatArguments(), 1855 Converted.flatSize(), InsertPos); 1856 1857 // Build the canonical type that describes the converted template 1858 // arguments of the class template partial specialization. 1859 QualType CanonType 1860 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), 1861 Converted.getFlatArguments(), 1862 Converted.flatSize()); 1863 1864 // Build the fully-sugared type for this class template 1865 // specialization as the user wrote in the specialization 1866 // itself. This means that we'll pretty-print the type retrieved 1867 // from the specialization's declaration the way that the user 1868 // actually wrote the specialization, rather than formatting the 1869 // name based on the "canonical" representation used to store the 1870 // template arguments in the specialization. 1871 TypeSourceInfo *WrittenTy 1872 = SemaRef.Context.getTemplateSpecializationTypeInfo( 1873 TemplateName(ClassTemplate), 1874 PartialSpec->getLocation(), 1875 InstTemplateArgs, 1876 CanonType); 1877 1878 if (PrevDecl) { 1879 // We've already seen a partial specialization with the same template 1880 // parameters and template arguments. This can happen, for example, when 1881 // substituting the outer template arguments ends up causing two 1882 // class template partial specializations of a member class template 1883 // to have identical forms, e.g., 1884 // 1885 // template<typename T, typename U> 1886 // struct Outer { 1887 // template<typename X, typename Y> struct Inner; 1888 // template<typename Y> struct Inner<T, Y>; 1889 // template<typename Y> struct Inner<U, Y>; 1890 // }; 1891 // 1892 // Outer<int, int> outer; // error: the partial specializations of Inner 1893 // // have the same signature. 1894 SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared) 1895 << WrittenTy; 1896 SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here) 1897 << SemaRef.Context.getTypeDeclType(PrevDecl); 1898 return true; 1899 } 1900 1901 1902 // Create the class template partial specialization declaration. 1903 ClassTemplatePartialSpecializationDecl *InstPartialSpec 1904 = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, 1905 PartialSpec->getTagKind(), 1906 Owner, 1907 PartialSpec->getLocation(), 1908 InstParams, 1909 ClassTemplate, 1910 Converted, 1911 InstTemplateArgs, 1912 CanonType, 1913 0, 1914 ClassTemplate->getNextPartialSpecSequenceNumber()); 1915 // Substitute the nested name specifier, if any. 1916 if (SubstQualifier(PartialSpec, InstPartialSpec)) 1917 return 0; 1918 1919 InstPartialSpec->setInstantiatedFromMember(PartialSpec); 1920 InstPartialSpec->setTypeAsWritten(WrittenTy); 1921 1922 // Add this partial specialization to the set of class template partial 1923 // specializations. 1924 ClassTemplate->AddPartialSpecialization(InstPartialSpec, InsertPos); 1925 return false; 1926} 1927 1928TypeSourceInfo* 1929TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, 1930 llvm::SmallVectorImpl<ParmVarDecl *> &Params) { 1931 TypeSourceInfo *OldTInfo = D->getTypeSourceInfo(); 1932 assert(OldTInfo && "substituting function without type source info"); 1933 assert(Params.empty() && "parameter vector is non-empty at start"); 1934 TypeSourceInfo *NewTInfo 1935 = SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs, 1936 D->getTypeSpecStartLoc(), 1937 D->getDeclName()); 1938 if (!NewTInfo) 1939 return 0; 1940 1941 if (NewTInfo != OldTInfo) { 1942 // Get parameters from the new type info. 1943 TypeLoc OldTL = OldTInfo->getTypeLoc(); 1944 if (FunctionProtoTypeLoc *OldProtoLoc 1945 = dyn_cast<FunctionProtoTypeLoc>(&OldTL)) { 1946 TypeLoc NewTL = NewTInfo->getTypeLoc(); 1947 FunctionProtoTypeLoc *NewProtoLoc = cast<FunctionProtoTypeLoc>(&NewTL); 1948 assert(NewProtoLoc && "Missing prototype?"); 1949 for (unsigned i = 0, i_end = NewProtoLoc->getNumArgs(); i != i_end; ++i) { 1950 // FIXME: Variadic templates will break this. 1951 Params.push_back(NewProtoLoc->getArg(i)); 1952 SemaRef.CurrentInstantiationScope->InstantiatedLocal( 1953 OldProtoLoc->getArg(i), 1954 NewProtoLoc->getArg(i)); 1955 } 1956 } 1957 } else { 1958 // The function type itself was not dependent and therefore no 1959 // substitution occurred. However, we still need to instantiate 1960 // the function parameters themselves. 1961 TypeLoc OldTL = OldTInfo->getTypeLoc(); 1962 if (FunctionProtoTypeLoc *OldProtoLoc 1963 = dyn_cast<FunctionProtoTypeLoc>(&OldTL)) { 1964 for (unsigned i = 0, i_end = OldProtoLoc->getNumArgs(); i != i_end; ++i) { 1965 ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc->getArg(i)); 1966 if (!Parm) 1967 return 0; 1968 Params.push_back(Parm); 1969 } 1970 } 1971 } 1972 return NewTInfo; 1973} 1974 1975/// \brief Initializes the common fields of an instantiation function 1976/// declaration (New) from the corresponding fields of its template (Tmpl). 1977/// 1978/// \returns true if there was an error 1979bool 1980TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, 1981 FunctionDecl *Tmpl) { 1982 if (Tmpl->isDeleted()) 1983 New->setDeleted(); 1984 1985 // If we are performing substituting explicitly-specified template arguments 1986 // or deduced template arguments into a function template and we reach this 1987 // point, we are now past the point where SFINAE applies and have committed 1988 // to keeping the new function template specialization. We therefore 1989 // convert the active template instantiation for the function template 1990 // into a template instantiation for this specific function template 1991 // specialization, which is not a SFINAE context, so that we diagnose any 1992 // further errors in the declaration itself. 1993 typedef Sema::ActiveTemplateInstantiation ActiveInstType; 1994 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); 1995 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || 1996 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { 1997 if (FunctionTemplateDecl *FunTmpl 1998 = dyn_cast<FunctionTemplateDecl>((Decl *)ActiveInst.Entity)) { 1999 assert(FunTmpl->getTemplatedDecl() == Tmpl && 2000 "Deduction from the wrong function template?"); 2001 (void) FunTmpl; 2002 ActiveInst.Kind = ActiveInstType::TemplateInstantiation; 2003 ActiveInst.Entity = reinterpret_cast<uintptr_t>(New); 2004 --SemaRef.NonInstantiationEntries; 2005 } 2006 } 2007 2008 const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>(); 2009 assert(Proto && "Function template without prototype?"); 2010 2011 if (Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec() || 2012 Proto->getNoReturnAttr()) { 2013 // The function has an exception specification or a "noreturn" 2014 // attribute. Substitute into each of the exception types. 2015 llvm::SmallVector<QualType, 4> Exceptions; 2016 for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) { 2017 // FIXME: Poor location information! 2018 QualType T 2019 = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs, 2020 New->getLocation(), New->getDeclName()); 2021 if (T.isNull() || 2022 SemaRef.CheckSpecifiedExceptionType(T, New->getLocation())) 2023 continue; 2024 2025 Exceptions.push_back(T); 2026 } 2027 2028 // Rebuild the function type 2029 2030 const FunctionProtoType *NewProto 2031 = New->getType()->getAs<FunctionProtoType>(); 2032 assert(NewProto && "Template instantiation without function prototype?"); 2033 New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), 2034 NewProto->arg_type_begin(), 2035 NewProto->getNumArgs(), 2036 NewProto->isVariadic(), 2037 NewProto->getTypeQuals(), 2038 Proto->hasExceptionSpec(), 2039 Proto->hasAnyExceptionSpec(), 2040 Exceptions.size(), 2041 Exceptions.data(), 2042 Proto->getExtInfo())); 2043 } 2044 2045 SemaRef.InstantiateAttrs(TemplateArgs, Tmpl, New); 2046 2047 return false; 2048} 2049 2050/// \brief Initializes common fields of an instantiated method 2051/// declaration (New) from the corresponding fields of its template 2052/// (Tmpl). 2053/// 2054/// \returns true if there was an error 2055bool 2056TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, 2057 CXXMethodDecl *Tmpl) { 2058 if (InitFunctionInstantiation(New, Tmpl)) 2059 return true; 2060 2061 New->setAccess(Tmpl->getAccess()); 2062 if (Tmpl->isVirtualAsWritten()) 2063 New->setVirtualAsWritten(true); 2064 2065 // FIXME: attributes 2066 // FIXME: New needs a pointer to Tmpl 2067 return false; 2068} 2069 2070/// \brief Instantiate the definition of the given function from its 2071/// template. 2072/// 2073/// \param PointOfInstantiation the point at which the instantiation was 2074/// required. Note that this is not precisely a "point of instantiation" 2075/// for the function, but it's close. 2076/// 2077/// \param Function the already-instantiated declaration of a 2078/// function template specialization or member function of a class template 2079/// specialization. 2080/// 2081/// \param Recursive if true, recursively instantiates any functions that 2082/// are required by this instantiation. 2083/// 2084/// \param DefinitionRequired if true, then we are performing an explicit 2085/// instantiation where the body of the function is required. Complain if 2086/// there is no such body. 2087void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, 2088 FunctionDecl *Function, 2089 bool Recursive, 2090 bool DefinitionRequired) { 2091 if (Function->isInvalidDecl() || Function->hasBody()) 2092 return; 2093 2094 // Never instantiate an explicit specialization. 2095 if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 2096 return; 2097 2098 // Find the function body that we'll be substituting. 2099 const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern(); 2100 Stmt *Pattern = 0; 2101 if (PatternDecl) 2102 Pattern = PatternDecl->getBody(PatternDecl); 2103 2104 if (!Pattern) { 2105 if (DefinitionRequired) { 2106 if (Function->getPrimaryTemplate()) 2107 Diag(PointOfInstantiation, 2108 diag::err_explicit_instantiation_undefined_func_template) 2109 << Function->getPrimaryTemplate(); 2110 else 2111 Diag(PointOfInstantiation, 2112 diag::err_explicit_instantiation_undefined_member) 2113 << 1 << Function->getDeclName() << Function->getDeclContext(); 2114 2115 if (PatternDecl) 2116 Diag(PatternDecl->getLocation(), 2117 diag::note_explicit_instantiation_here); 2118 Function->setInvalidDecl(); 2119 } else if (Function->getTemplateSpecializationKind() 2120 == TSK_ExplicitInstantiationDefinition) { 2121 PendingInstantiations.push_back( 2122 std::make_pair(Function, PointOfInstantiation)); 2123 } 2124 2125 return; 2126 } 2127 2128 // C++0x [temp.explicit]p9: 2129 // Except for inline functions, other explicit instantiation declarations 2130 // have the effect of suppressing the implicit instantiation of the entity 2131 // to which they refer. 2132 if (Function->getTemplateSpecializationKind() 2133 == TSK_ExplicitInstantiationDeclaration && 2134 !PatternDecl->isInlined()) 2135 return; 2136 2137 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); 2138 if (Inst) 2139 return; 2140 2141 // If we're performing recursive template instantiation, create our own 2142 // queue of pending implicit instantiations that we will instantiate later, 2143 // while we're still within our own instantiation context. 2144 std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; 2145 if (Recursive) 2146 PendingInstantiations.swap(SavedPendingInstantiations); 2147 2148 EnterExpressionEvaluationContext EvalContext(*this, 2149 Sema::PotentiallyEvaluated); 2150 ActOnStartOfFunctionDef(0, Function); 2151 2152 // Introduce a new scope where local variable instantiations will be 2153 // recorded, unless we're actually a member function within a local 2154 // class, in which case we need to merge our results with the parent 2155 // scope (of the enclosing function). 2156 bool MergeWithParentScope = false; 2157 if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext())) 2158 MergeWithParentScope = Rec->isLocalClass(); 2159 2160 LocalInstantiationScope Scope(*this, MergeWithParentScope); 2161 2162 // Introduce the instantiated function parameters into the local 2163 // instantiation scope, and set the parameter names to those used 2164 // in the template. 2165 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) { 2166 const ParmVarDecl *PatternParam = PatternDecl->getParamDecl(I); 2167 ParmVarDecl *FunctionParam = Function->getParamDecl(I); 2168 FunctionParam->setDeclName(PatternParam->getDeclName()); 2169 Scope.InstantiatedLocal(PatternParam, FunctionParam); 2170 } 2171 2172 // Enter the scope of this instantiation. We don't use 2173 // PushDeclContext because we don't have a scope. 2174 DeclContext *PreviousContext = CurContext; 2175 CurContext = Function; 2176 2177 MultiLevelTemplateArgumentList TemplateArgs = 2178 getTemplateInstantiationArgs(Function, 0, false, PatternDecl); 2179 2180 // If this is a constructor, instantiate the member initializers. 2181 if (const CXXConstructorDecl *Ctor = 2182 dyn_cast<CXXConstructorDecl>(PatternDecl)) { 2183 InstantiateMemInitializers(cast<CXXConstructorDecl>(Function), Ctor, 2184 TemplateArgs); 2185 } 2186 2187 // Instantiate the function body. 2188 StmtResult Body = SubstStmt(Pattern, TemplateArgs); 2189 2190 if (Body.isInvalid()) 2191 Function->setInvalidDecl(); 2192 2193 ActOnFinishFunctionBody(Function, Body.get(), 2194 /*IsInstantiation=*/true); 2195 2196 PerformDependentDiagnostics(PatternDecl, TemplateArgs); 2197 2198 CurContext = PreviousContext; 2199 2200 DeclGroupRef DG(Function); 2201 Consumer.HandleTopLevelDecl(DG); 2202 2203 // This class may have local implicit instantiations that need to be 2204 // instantiation within this scope. 2205 PerformPendingInstantiations(/*LocalOnly=*/true); 2206 Scope.Exit(); 2207 2208 if (Recursive) { 2209 // Instantiate any pending implicit instantiations found during the 2210 // instantiation of this template. 2211 PerformPendingInstantiations(); 2212 2213 // Restore the set of pending implicit instantiations. 2214 PendingInstantiations.swap(SavedPendingInstantiations); 2215 } 2216} 2217 2218/// \brief Instantiate the definition of the given variable from its 2219/// template. 2220/// 2221/// \param PointOfInstantiation the point at which the instantiation was 2222/// required. Note that this is not precisely a "point of instantiation" 2223/// for the function, but it's close. 2224/// 2225/// \param Var the already-instantiated declaration of a static member 2226/// variable of a class template specialization. 2227/// 2228/// \param Recursive if true, recursively instantiates any functions that 2229/// are required by this instantiation. 2230/// 2231/// \param DefinitionRequired if true, then we are performing an explicit 2232/// instantiation where an out-of-line definition of the member variable 2233/// is required. Complain if there is no such definition. 2234void Sema::InstantiateStaticDataMemberDefinition( 2235 SourceLocation PointOfInstantiation, 2236 VarDecl *Var, 2237 bool Recursive, 2238 bool DefinitionRequired) { 2239 if (Var->isInvalidDecl()) 2240 return; 2241 2242 // Find the out-of-line definition of this static data member. 2243 VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); 2244 assert(Def && "This data member was not instantiated from a template?"); 2245 assert(Def->isStaticDataMember() && "Not a static data member?"); 2246 Def = Def->getOutOfLineDefinition(); 2247 2248 if (!Def) { 2249 // We did not find an out-of-line definition of this static data member, 2250 // so we won't perform any instantiation. Rather, we rely on the user to 2251 // instantiate this definition (or provide a specialization for it) in 2252 // another translation unit. 2253 if (DefinitionRequired) { 2254 Def = Var->getInstantiatedFromStaticDataMember(); 2255 Diag(PointOfInstantiation, 2256 diag::err_explicit_instantiation_undefined_member) 2257 << 2 << Var->getDeclName() << Var->getDeclContext(); 2258 Diag(Def->getLocation(), diag::note_explicit_instantiation_here); 2259 } else if (Var->getTemplateSpecializationKind() 2260 == TSK_ExplicitInstantiationDefinition) { 2261 PendingInstantiations.push_back( 2262 std::make_pair(Var, PointOfInstantiation)); 2263 } 2264 2265 return; 2266 } 2267 2268 // Never instantiate an explicit specialization. 2269 if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) 2270 return; 2271 2272 // C++0x [temp.explicit]p9: 2273 // Except for inline functions, other explicit instantiation declarations 2274 // have the effect of suppressing the implicit instantiation of the entity 2275 // to which they refer. 2276 if (Var->getTemplateSpecializationKind() 2277 == TSK_ExplicitInstantiationDeclaration) 2278 return; 2279 2280 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); 2281 if (Inst) 2282 return; 2283 2284 // If we're performing recursive template instantiation, create our own 2285 // queue of pending implicit instantiations that we will instantiate later, 2286 // while we're still within our own instantiation context. 2287 std::deque<PendingImplicitInstantiation> SavedPendingInstantiations; 2288 if (Recursive) 2289 PendingInstantiations.swap(SavedPendingInstantiations); 2290 2291 // Enter the scope of this instantiation. We don't use 2292 // PushDeclContext because we don't have a scope. 2293 DeclContext *PreviousContext = CurContext; 2294 CurContext = Var->getDeclContext(); 2295 2296 VarDecl *OldVar = Var; 2297 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(), 2298 getTemplateInstantiationArgs(Var))); 2299 CurContext = PreviousContext; 2300 2301 if (Var) { 2302 MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); 2303 assert(MSInfo && "Missing member specialization information?"); 2304 Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), 2305 MSInfo->getPointOfInstantiation()); 2306 DeclGroupRef DG(Var); 2307 Consumer.HandleTopLevelDecl(DG); 2308 } 2309 2310 if (Recursive) { 2311 // Instantiate any pending implicit instantiations found during the 2312 // instantiation of this template. 2313 PerformPendingInstantiations(); 2314 2315 // Restore the set of pending implicit instantiations. 2316 PendingInstantiations.swap(SavedPendingInstantiations); 2317 } 2318} 2319 2320void 2321Sema::InstantiateMemInitializers(CXXConstructorDecl *New, 2322 const CXXConstructorDecl *Tmpl, 2323 const MultiLevelTemplateArgumentList &TemplateArgs) { 2324 2325 llvm::SmallVector<MemInitTy*, 4> NewInits; 2326 bool AnyErrors = false; 2327 2328 // Instantiate all the initializers. 2329 for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), 2330 InitsEnd = Tmpl->init_end(); 2331 Inits != InitsEnd; ++Inits) { 2332 CXXBaseOrMemberInitializer *Init = *Inits; 2333 2334 // Only instantiate written initializers, let Sema re-construct implicit 2335 // ones. 2336 if (!Init->isWritten()) 2337 continue; 2338 2339 SourceLocation LParenLoc, RParenLoc; 2340 ASTOwningVector<Expr*> NewArgs(*this); 2341 2342 // Instantiate the initializer. 2343 if (InstantiateInitializer(*this, Init->getInit(), TemplateArgs, 2344 LParenLoc, NewArgs, RParenLoc)) { 2345 AnyErrors = true; 2346 continue; 2347 } 2348 2349 MemInitResult NewInit; 2350 if (Init->isBaseInitializer()) { 2351 TypeSourceInfo *BaseTInfo = SubstType(Init->getBaseClassInfo(), 2352 TemplateArgs, 2353 Init->getSourceLocation(), 2354 New->getDeclName()); 2355 if (!BaseTInfo) { 2356 AnyErrors = true; 2357 New->setInvalidDecl(); 2358 continue; 2359 } 2360 2361 NewInit = BuildBaseInitializer(BaseTInfo->getType(), BaseTInfo, 2362 (Expr **)NewArgs.data(), 2363 NewArgs.size(), 2364 Init->getLParenLoc(), 2365 Init->getRParenLoc(), 2366 New->getParent()); 2367 } else if (Init->isMemberInitializer()) { 2368 FieldDecl *Member; 2369 2370 // Is this an anonymous union? 2371 if (FieldDecl *UnionInit = Init->getAnonUnionMember()) 2372 Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMemberLocation(), 2373 UnionInit, TemplateArgs)); 2374 else 2375 Member = cast<FieldDecl>(FindInstantiatedDecl(Init->getMemberLocation(), 2376 Init->getMember(), 2377 TemplateArgs)); 2378 2379 NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(), 2380 NewArgs.size(), 2381 Init->getSourceLocation(), 2382 Init->getLParenLoc(), 2383 Init->getRParenLoc()); 2384 } 2385 2386 if (NewInit.isInvalid()) { 2387 AnyErrors = true; 2388 New->setInvalidDecl(); 2389 } else { 2390 // FIXME: It would be nice if ASTOwningVector had a release function. 2391 NewArgs.take(); 2392 2393 NewInits.push_back((MemInitTy *)NewInit.get()); 2394 } 2395 } 2396 2397 // Assign all the initializers to the new constructor. 2398 ActOnMemInitializers(New, 2399 /*FIXME: ColonLoc */ 2400 SourceLocation(), 2401 NewInits.data(), NewInits.size(), 2402 AnyErrors); 2403} 2404 2405// TODO: this could be templated if the various decl types used the 2406// same method name. 2407static bool isInstantiationOf(ClassTemplateDecl *Pattern, 2408 ClassTemplateDecl *Instance) { 2409 Pattern = Pattern->getCanonicalDecl(); 2410 2411 do { 2412 Instance = Instance->getCanonicalDecl(); 2413 if (Pattern == Instance) return true; 2414 Instance = Instance->getInstantiatedFromMemberTemplate(); 2415 } while (Instance); 2416 2417 return false; 2418} 2419 2420static bool isInstantiationOf(FunctionTemplateDecl *Pattern, 2421 FunctionTemplateDecl *Instance) { 2422 Pattern = Pattern->getCanonicalDecl(); 2423 2424 do { 2425 Instance = Instance->getCanonicalDecl(); 2426 if (Pattern == Instance) return true; 2427 Instance = Instance->getInstantiatedFromMemberTemplate(); 2428 } while (Instance); 2429 2430 return false; 2431} 2432 2433static bool 2434isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern, 2435 ClassTemplatePartialSpecializationDecl *Instance) { 2436 Pattern 2437 = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl()); 2438 do { 2439 Instance = cast<ClassTemplatePartialSpecializationDecl>( 2440 Instance->getCanonicalDecl()); 2441 if (Pattern == Instance) 2442 return true; 2443 Instance = Instance->getInstantiatedFromMember(); 2444 } while (Instance); 2445 2446 return false; 2447} 2448 2449static bool isInstantiationOf(CXXRecordDecl *Pattern, 2450 CXXRecordDecl *Instance) { 2451 Pattern = Pattern->getCanonicalDecl(); 2452 2453 do { 2454 Instance = Instance->getCanonicalDecl(); 2455 if (Pattern == Instance) return true; 2456 Instance = Instance->getInstantiatedFromMemberClass(); 2457 } while (Instance); 2458 2459 return false; 2460} 2461 2462static bool isInstantiationOf(FunctionDecl *Pattern, 2463 FunctionDecl *Instance) { 2464 Pattern = Pattern->getCanonicalDecl(); 2465 2466 do { 2467 Instance = Instance->getCanonicalDecl(); 2468 if (Pattern == Instance) return true; 2469 Instance = Instance->getInstantiatedFromMemberFunction(); 2470 } while (Instance); 2471 2472 return false; 2473} 2474 2475static bool isInstantiationOf(EnumDecl *Pattern, 2476 EnumDecl *Instance) { 2477 Pattern = Pattern->getCanonicalDecl(); 2478 2479 do { 2480 Instance = Instance->getCanonicalDecl(); 2481 if (Pattern == Instance) return true; 2482 Instance = Instance->getInstantiatedFromMemberEnum(); 2483 } while (Instance); 2484 2485 return false; 2486} 2487 2488static bool isInstantiationOf(UsingShadowDecl *Pattern, 2489 UsingShadowDecl *Instance, 2490 ASTContext &C) { 2491 return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern; 2492} 2493 2494static bool isInstantiationOf(UsingDecl *Pattern, 2495 UsingDecl *Instance, 2496 ASTContext &C) { 2497 return C.getInstantiatedFromUsingDecl(Instance) == Pattern; 2498} 2499 2500static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern, 2501 UsingDecl *Instance, 2502 ASTContext &C) { 2503 return C.getInstantiatedFromUsingDecl(Instance) == Pattern; 2504} 2505 2506static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern, 2507 UsingDecl *Instance, 2508 ASTContext &C) { 2509 return C.getInstantiatedFromUsingDecl(Instance) == Pattern; 2510} 2511 2512static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, 2513 VarDecl *Instance) { 2514 assert(Instance->isStaticDataMember()); 2515 2516 Pattern = Pattern->getCanonicalDecl(); 2517 2518 do { 2519 Instance = Instance->getCanonicalDecl(); 2520 if (Pattern == Instance) return true; 2521 Instance = Instance->getInstantiatedFromStaticDataMember(); 2522 } while (Instance); 2523 2524 return false; 2525} 2526 2527// Other is the prospective instantiation 2528// D is the prospective pattern 2529static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { 2530 if (D->getKind() != Other->getKind()) { 2531 if (UnresolvedUsingTypenameDecl *UUD 2532 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 2533 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 2534 return isInstantiationOf(UUD, UD, Ctx); 2535 } 2536 } 2537 2538 if (UnresolvedUsingValueDecl *UUD 2539 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 2540 if (UsingDecl *UD = dyn_cast<UsingDecl>(Other)) { 2541 return isInstantiationOf(UUD, UD, Ctx); 2542 } 2543 } 2544 2545 return false; 2546 } 2547 2548 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Other)) 2549 return isInstantiationOf(cast<CXXRecordDecl>(D), Record); 2550 2551 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Other)) 2552 return isInstantiationOf(cast<FunctionDecl>(D), Function); 2553 2554 if (EnumDecl *Enum = dyn_cast<EnumDecl>(Other)) 2555 return isInstantiationOf(cast<EnumDecl>(D), Enum); 2556 2557 if (VarDecl *Var = dyn_cast<VarDecl>(Other)) 2558 if (Var->isStaticDataMember()) 2559 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var); 2560 2561 if (ClassTemplateDecl *Temp = dyn_cast<ClassTemplateDecl>(Other)) 2562 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp); 2563 2564 if (FunctionTemplateDecl *Temp = dyn_cast<FunctionTemplateDecl>(Other)) 2565 return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp); 2566 2567 if (ClassTemplatePartialSpecializationDecl *PartialSpec 2568 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Other)) 2569 return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D), 2570 PartialSpec); 2571 2572 if (FieldDecl *Field = dyn_cast<FieldDecl>(Other)) { 2573 if (!Field->getDeclName()) { 2574 // This is an unnamed field. 2575 return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == 2576 cast<FieldDecl>(D); 2577 } 2578 } 2579 2580 if (UsingDecl *Using = dyn_cast<UsingDecl>(Other)) 2581 return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx); 2582 2583 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(Other)) 2584 return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx); 2585 2586 return D->getDeclName() && isa<NamedDecl>(Other) && 2587 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName(); 2588} 2589 2590template<typename ForwardIterator> 2591static NamedDecl *findInstantiationOf(ASTContext &Ctx, 2592 NamedDecl *D, 2593 ForwardIterator first, 2594 ForwardIterator last) { 2595 for (; first != last; ++first) 2596 if (isInstantiationOf(Ctx, D, *first)) 2597 return cast<NamedDecl>(*first); 2598 2599 return 0; 2600} 2601 2602/// \brief Finds the instantiation of the given declaration context 2603/// within the current instantiation. 2604/// 2605/// \returns NULL if there was an error 2606DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC, 2607 const MultiLevelTemplateArgumentList &TemplateArgs) { 2608 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) { 2609 Decl* ID = FindInstantiatedDecl(Loc, D, TemplateArgs); 2610 return cast_or_null<DeclContext>(ID); 2611 } else return DC; 2612} 2613 2614/// \brief Find the instantiation of the given declaration within the 2615/// current instantiation. 2616/// 2617/// This routine is intended to be used when \p D is a declaration 2618/// referenced from within a template, that needs to mapped into the 2619/// corresponding declaration within an instantiation. For example, 2620/// given: 2621/// 2622/// \code 2623/// template<typename T> 2624/// struct X { 2625/// enum Kind { 2626/// KnownValue = sizeof(T) 2627/// }; 2628/// 2629/// bool getKind() const { return KnownValue; } 2630/// }; 2631/// 2632/// template struct X<int>; 2633/// \endcode 2634/// 2635/// In the instantiation of X<int>::getKind(), we need to map the 2636/// EnumConstantDecl for KnownValue (which refers to 2637/// X<T>::<Kind>::KnownValue) to its instantiation 2638/// (X<int>::<Kind>::KnownValue). InstantiateCurrentDeclRef() performs 2639/// this mapping from within the instantiation of X<int>. 2640NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, 2641 const MultiLevelTemplateArgumentList &TemplateArgs) { 2642 DeclContext *ParentDC = D->getDeclContext(); 2643 if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) || 2644 isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) || 2645 (ParentDC->isFunctionOrMethod() && ParentDC->isDependentContext())) { 2646 // D is a local of some kind. Look into the map of local 2647 // declarations to their instantiations. 2648 return cast<NamedDecl>(CurrentInstantiationScope->getInstantiationOf(D)); 2649 } 2650 2651 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { 2652 if (!Record->isDependentContext()) 2653 return D; 2654 2655 // If the RecordDecl is actually the injected-class-name or a 2656 // "templated" declaration for a class template, class template 2657 // partial specialization, or a member class of a class template, 2658 // substitute into the injected-class-name of the class template 2659 // or partial specialization to find the new DeclContext. 2660 QualType T; 2661 ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate(); 2662 2663 if (ClassTemplate) { 2664 T = ClassTemplate->getInjectedClassNameSpecialization(); 2665 } else if (ClassTemplatePartialSpecializationDecl *PartialSpec 2666 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { 2667 ClassTemplate = PartialSpec->getSpecializedTemplate(); 2668 2669 // If we call SubstType with an InjectedClassNameType here we 2670 // can end up in an infinite loop. 2671 T = Context.getTypeDeclType(Record); 2672 assert(isa<InjectedClassNameType>(T) && 2673 "type of partial specialization is not an InjectedClassNameType"); 2674 T = cast<InjectedClassNameType>(T)->getInjectedSpecializationType(); 2675 } 2676 2677 if (!T.isNull()) { 2678 // Substitute into the injected-class-name to get the type 2679 // corresponding to the instantiation we want, which may also be 2680 // the current instantiation (if we're in a template 2681 // definition). This substitution should never fail, since we 2682 // know we can instantiate the injected-class-name or we 2683 // wouldn't have gotten to the injected-class-name! 2684 2685 // FIXME: Can we use the CurrentInstantiationScope to avoid this 2686 // extra instantiation in the common case? 2687 T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName()); 2688 assert(!T.isNull() && "Instantiation of injected-class-name cannot fail."); 2689 2690 if (!T->isDependentType()) { 2691 assert(T->isRecordType() && "Instantiation must produce a record type"); 2692 return T->getAs<RecordType>()->getDecl(); 2693 } 2694 2695 // We are performing "partial" template instantiation to create 2696 // the member declarations for the members of a class template 2697 // specialization. Therefore, D is actually referring to something 2698 // in the current instantiation. Look through the current 2699 // context, which contains actual instantiations, to find the 2700 // instantiation of the "current instantiation" that D refers 2701 // to. 2702 bool SawNonDependentContext = false; 2703 for (DeclContext *DC = CurContext; !DC->isFileContext(); 2704 DC = DC->getParent()) { 2705 if (ClassTemplateSpecializationDecl *Spec 2706 = dyn_cast<ClassTemplateSpecializationDecl>(DC)) 2707 if (isInstantiationOf(ClassTemplate, 2708 Spec->getSpecializedTemplate())) 2709 return Spec; 2710 2711 if (!DC->isDependentContext()) 2712 SawNonDependentContext = true; 2713 } 2714 2715 // We're performing "instantiation" of a member of the current 2716 // instantiation while we are type-checking the 2717 // definition. Compute the declaration context and return that. 2718 assert(!SawNonDependentContext && 2719 "No dependent context while instantiating record"); 2720 DeclContext *DC = computeDeclContext(T); 2721 assert(DC && 2722 "Unable to find declaration for the current instantiation"); 2723 return cast<CXXRecordDecl>(DC); 2724 } 2725 2726 // Fall through to deal with other dependent record types (e.g., 2727 // anonymous unions in class templates). 2728 } 2729 2730 if (!ParentDC->isDependentContext()) 2731 return D; 2732 2733 ParentDC = FindInstantiatedContext(Loc, ParentDC, TemplateArgs); 2734 if (!ParentDC) 2735 return 0; 2736 2737 if (ParentDC != D->getDeclContext()) { 2738 // We performed some kind of instantiation in the parent context, 2739 // so now we need to look into the instantiated parent context to 2740 // find the instantiation of the declaration D. 2741 2742 // If our context used to be dependent, we may need to instantiate 2743 // it before performing lookup into that context. 2744 if (CXXRecordDecl *Spec = dyn_cast<CXXRecordDecl>(ParentDC)) { 2745 if (!Spec->isDependentContext()) { 2746 QualType T = Context.getTypeDeclType(Spec); 2747 const RecordType *Tag = T->getAs<RecordType>(); 2748 assert(Tag && "type of non-dependent record is not a RecordType"); 2749 if (!Tag->isBeingDefined() && 2750 RequireCompleteType(Loc, T, diag::err_incomplete_type)) 2751 return 0; 2752 } 2753 } 2754 2755 NamedDecl *Result = 0; 2756 if (D->getDeclName()) { 2757 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); 2758 Result = findInstantiationOf(Context, D, Found.first, Found.second); 2759 } else { 2760 // Since we don't have a name for the entity we're looking for, 2761 // our only option is to walk through all of the declarations to 2762 // find that name. This will occur in a few cases: 2763 // 2764 // - anonymous struct/union within a template 2765 // - unnamed class/struct/union/enum within a template 2766 // 2767 // FIXME: Find a better way to find these instantiations! 2768 Result = findInstantiationOf(Context, D, 2769 ParentDC->decls_begin(), 2770 ParentDC->decls_end()); 2771 } 2772 2773 // UsingShadowDecls can instantiate to nothing because of using hiding. 2774 assert((Result || isa<UsingShadowDecl>(D) || D->isInvalidDecl() || 2775 cast<Decl>(ParentDC)->isInvalidDecl()) 2776 && "Unable to find instantiation of declaration!"); 2777 2778 D = Result; 2779 } 2780 2781 return D; 2782} 2783 2784/// \brief Performs template instantiation for all implicit template 2785/// instantiations we have seen until this point. 2786void Sema::PerformPendingInstantiations(bool LocalOnly) { 2787 while (!PendingLocalImplicitInstantiations.empty() || 2788 (!LocalOnly && !PendingInstantiations.empty())) { 2789 PendingImplicitInstantiation Inst; 2790 2791 if (PendingLocalImplicitInstantiations.empty()) { 2792 Inst = PendingInstantiations.front(); 2793 PendingInstantiations.pop_front(); 2794 } else { 2795 Inst = PendingLocalImplicitInstantiations.front(); 2796 PendingLocalImplicitInstantiations.pop_front(); 2797 } 2798 2799 // Instantiate function definitions 2800 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) { 2801 PrettyDeclStackTraceEntry CrashInfo(*this, Function, SourceLocation(), 2802 "instantiating function definition"); 2803 bool DefinitionRequired = Function->getTemplateSpecializationKind() == 2804 TSK_ExplicitInstantiationDefinition; 2805 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true, 2806 DefinitionRequired); 2807 continue; 2808 } 2809 2810 // Instantiate static data member definitions. 2811 VarDecl *Var = cast<VarDecl>(Inst.first); 2812 assert(Var->isStaticDataMember() && "Not a static data member?"); 2813 2814 // Don't try to instantiate declarations if the most recent redeclaration 2815 // is invalid. 2816 if (Var->getMostRecentDeclaration()->isInvalidDecl()) 2817 continue; 2818 2819 // Check if the most recent declaration has changed the specialization kind 2820 // and removed the need for implicit instantiation. 2821 switch (Var->getMostRecentDeclaration()->getTemplateSpecializationKind()) { 2822 case TSK_Undeclared: 2823 assert(false && "Cannot instantitiate an undeclared specialization."); 2824 case TSK_ExplicitInstantiationDeclaration: 2825 case TSK_ExplicitSpecialization: 2826 continue; // No longer need to instantiate this type. 2827 case TSK_ExplicitInstantiationDefinition: 2828 // We only need an instantiation if the pending instantiation *is* the 2829 // explicit instantiation. 2830 if (Var != Var->getMostRecentDeclaration()) continue; 2831 case TSK_ImplicitInstantiation: 2832 break; 2833 } 2834 2835 PrettyDeclStackTraceEntry CrashInfo(*this, Var, Var->getLocation(), 2836 "instantiating static data member " 2837 "definition"); 2838 2839 bool DefinitionRequired = Var->getTemplateSpecializationKind() == 2840 TSK_ExplicitInstantiationDefinition; 2841 InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true, 2842 DefinitionRequired); 2843 } 2844} 2845 2846void Sema::PerformDependentDiagnostics(const DeclContext *Pattern, 2847 const MultiLevelTemplateArgumentList &TemplateArgs) { 2848 for (DeclContext::ddiag_iterator I = Pattern->ddiag_begin(), 2849 E = Pattern->ddiag_end(); I != E; ++I) { 2850 DependentDiagnostic *DD = *I; 2851 2852 switch (DD->getKind()) { 2853 case DependentDiagnostic::Access: 2854 HandleDependentAccessCheck(*DD, TemplateArgs); 2855 break; 2856 } 2857 } 2858} 2859 2860