//===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/ // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. //===----------------------------------------------------------------------===/ // // This file implements C++ template instantiation for declarations. // //===----------------------------------------------------------------------===/ #include "Sema.h" #include "Lookup.h" #include "clang/AST/ASTConsumer.h" #include "clang/AST/ASTContext.h" #include "clang/AST/DeclTemplate.h" #include "clang/AST/DeclVisitor.h" #include "clang/AST/DependentDiagnostic.h" #include "clang/AST/Expr.h" #include "clang/AST/ExprCXX.h" #include "clang/AST/TypeLoc.h" #include "clang/Basic/PrettyStackTrace.h" #include "clang/Lex/Preprocessor.h" using namespace clang; namespace { class TemplateDeclInstantiator : public DeclVisitor { Sema &SemaRef; DeclContext *Owner; const MultiLevelTemplateArgumentList &TemplateArgs; void InstantiateAttrs(Decl *Tmpl, Decl *New); public: typedef Sema::OwningExprResult OwningExprResult; TemplateDeclInstantiator(Sema &SemaRef, DeclContext *Owner, const MultiLevelTemplateArgumentList &TemplateArgs) : SemaRef(SemaRef), Owner(Owner), TemplateArgs(TemplateArgs) { } // FIXME: Once we get closer to completion, replace these manually-written // declarations with automatically-generated ones from // clang/AST/DeclNodes.def. Decl *VisitTranslationUnitDecl(TranslationUnitDecl *D); Decl *VisitNamespaceDecl(NamespaceDecl *D); Decl *VisitNamespaceAliasDecl(NamespaceAliasDecl *D); Decl *VisitTypedefDecl(TypedefDecl *D); Decl *VisitVarDecl(VarDecl *D); Decl *VisitFieldDecl(FieldDecl *D); Decl *VisitStaticAssertDecl(StaticAssertDecl *D); Decl *VisitEnumDecl(EnumDecl *D); Decl *VisitEnumConstantDecl(EnumConstantDecl *D); Decl *VisitFriendDecl(FriendDecl *D); Decl *VisitFunctionDecl(FunctionDecl *D, TemplateParameterList *TemplateParams = 0); Decl *VisitCXXRecordDecl(CXXRecordDecl *D); Decl *VisitCXXMethodDecl(CXXMethodDecl *D, TemplateParameterList *TemplateParams = 0); Decl *VisitCXXConstructorDecl(CXXConstructorDecl *D); Decl *VisitCXXDestructorDecl(CXXDestructorDecl *D); Decl *VisitCXXConversionDecl(CXXConversionDecl *D); ParmVarDecl *VisitParmVarDecl(ParmVarDecl *D); Decl *VisitClassTemplateDecl(ClassTemplateDecl *D); Decl *VisitClassTemplatePartialSpecializationDecl( ClassTemplatePartialSpecializationDecl *D); Decl *VisitFunctionTemplateDecl(FunctionTemplateDecl *D); Decl *VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D); Decl *VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D); Decl *VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D); Decl *VisitUsingDirectiveDecl(UsingDirectiveDecl *D); Decl *VisitUsingDecl(UsingDecl *D); Decl *VisitUsingShadowDecl(UsingShadowDecl *D); Decl *VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D); Decl *VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D); // Base case. FIXME: Remove once we can instantiate everything. Decl *VisitDecl(Decl *D) { unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID( Diagnostic::Error, "cannot instantiate %0 yet"); SemaRef.Diag(D->getLocation(), DiagID) << D->getDeclKindName(); return 0; } const LangOptions &getLangOptions() { return SemaRef.getLangOptions(); } // Helper functions for instantiating methods. TypeSourceInfo *SubstFunctionType(FunctionDecl *D, llvm::SmallVectorImpl &Params); bool InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl); bool InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl); TemplateParameterList * SubstTemplateParams(TemplateParameterList *List); bool SubstQualifier(const DeclaratorDecl *OldDecl, DeclaratorDecl *NewDecl); bool SubstQualifier(const TagDecl *OldDecl, TagDecl *NewDecl); bool InstantiateClassTemplatePartialSpecialization( ClassTemplateDecl *ClassTemplate, ClassTemplatePartialSpecializationDecl *PartialSpec); }; } bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl, DeclaratorDecl *NewDecl) { NestedNameSpecifier *OldQual = OldDecl->getQualifier(); if (!OldQual) return false; SourceRange QualRange = OldDecl->getQualifierRange(); NestedNameSpecifier *NewQual = SemaRef.SubstNestedNameSpecifier(OldQual, QualRange, TemplateArgs); if (!NewQual) return true; NewDecl->setQualifierInfo(NewQual, QualRange); return false; } bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl, TagDecl *NewDecl) { NestedNameSpecifier *OldQual = OldDecl->getQualifier(); if (!OldQual) return false; SourceRange QualRange = OldDecl->getQualifierRange(); NestedNameSpecifier *NewQual = SemaRef.SubstNestedNameSpecifier(OldQual, QualRange, TemplateArgs); if (!NewQual) return true; NewDecl->setQualifierInfo(NewQual, QualRange); return false; } // FIXME: Is this too simple? void TemplateDeclInstantiator::InstantiateAttrs(Decl *Tmpl, Decl *New) { for (const Attr *TmplAttr = Tmpl->getAttrs(); TmplAttr; TmplAttr = TmplAttr->getNext()) { // FIXME: Is cloning correct for all attributes? Attr *NewAttr = TmplAttr->clone(SemaRef.Context); New->addAttr(NewAttr); } } Decl * TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) { assert(false && "Translation units cannot be instantiated"); return D; } Decl * TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) { assert(false && "Namespaces cannot be instantiated"); return D; } Decl * TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) { NamespaceAliasDecl *Inst = NamespaceAliasDecl::Create(SemaRef.Context, Owner, D->getNamespaceLoc(), D->getAliasLoc(), D->getNamespace()->getIdentifier(), D->getQualifierRange(), D->getQualifier(), D->getTargetNameLoc(), D->getNamespace()); Owner->addDecl(Inst); return Inst; } Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) { bool Invalid = false; TypeSourceInfo *DI = D->getTypeSourceInfo(); if (DI->getType()->isDependentType() || DI->getType()->isVariablyModifiedType()) { DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), D->getDeclName()); if (!DI) { Invalid = true; DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy); } } else { SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); } // Create the new typedef TypedefDecl *Typedef = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getIdentifier(), DI); if (Invalid) Typedef->setInvalidDecl(); if (const TagType *TT = DI->getType()->getAs()) { TagDecl *TD = TT->getDecl(); // If the TagDecl that the TypedefDecl points to is an anonymous decl // keep track of the TypedefDecl. if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) TD->setTypedefForAnonDecl(Typedef); } if (TypedefDecl *Prev = D->getPreviousDeclaration()) { NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev, TemplateArgs); Typedef->setPreviousDeclaration(cast(InstPrev)); } InstantiateAttrs(D, Typedef); Typedef->setAccess(D->getAccess()); Owner->addDecl(Typedef); return Typedef; } /// \brief Instantiate the arguments provided as part of initialization. /// /// \returns true if an error occurred, false otherwise. static bool InstantiateInitializationArguments(Sema &SemaRef, Expr **Args, unsigned NumArgs, const MultiLevelTemplateArgumentList &TemplateArgs, llvm::SmallVectorImpl &FakeCommaLocs, ASTOwningVector<&ActionBase::DeleteExpr> &InitArgs) { for (unsigned I = 0; I != NumArgs; ++I) { // When we hit the first defaulted argument, break out of the loop: // we don't pass those default arguments on. if (Args[I]->isDefaultArgument()) break; Sema::OwningExprResult Arg = SemaRef.SubstExpr(Args[I], TemplateArgs); if (Arg.isInvalid()) return true; Expr *ArgExpr = (Expr *)Arg.get(); InitArgs.push_back(Arg.release()); // FIXME: We're faking all of the comma locations. Do we need them? FakeCommaLocs.push_back( SemaRef.PP.getLocForEndOfToken(ArgExpr->getLocEnd())); } return false; } /// \brief Instantiate an initializer, breaking it into separate /// initialization arguments. /// /// \param S The semantic analysis object. /// /// \param Init The initializer to instantiate. /// /// \param TemplateArgs Template arguments to be substituted into the /// initializer. /// /// \param NewArgs Will be filled in with the instantiation arguments. /// /// \returns true if an error occurred, false otherwise static bool InstantiateInitializer(Sema &S, Expr *Init, const MultiLevelTemplateArgumentList &TemplateArgs, SourceLocation &LParenLoc, llvm::SmallVector &CommaLocs, ASTOwningVector<&ActionBase::DeleteExpr> &NewArgs, SourceLocation &RParenLoc) { NewArgs.clear(); LParenLoc = SourceLocation(); RParenLoc = SourceLocation(); if (!Init) return false; if (CXXExprWithTemporaries *ExprTemp = dyn_cast(Init)) Init = ExprTemp->getSubExpr(); while (CXXBindTemporaryExpr *Binder = dyn_cast(Init)) Init = Binder->getSubExpr(); if (ImplicitCastExpr *ICE = dyn_cast(Init)) Init = ICE->getSubExprAsWritten(); if (ParenListExpr *ParenList = dyn_cast(Init)) { LParenLoc = ParenList->getLParenLoc(); RParenLoc = ParenList->getRParenLoc(); return InstantiateInitializationArguments(S, ParenList->getExprs(), ParenList->getNumExprs(), TemplateArgs, CommaLocs, NewArgs); } if (CXXConstructExpr *Construct = dyn_cast(Init)) { if (!isa(Construct)) { if (InstantiateInitializationArguments(S, Construct->getArgs(), Construct->getNumArgs(), TemplateArgs, CommaLocs, NewArgs)) return true; // FIXME: Fake locations! LParenLoc = S.PP.getLocForEndOfToken(Init->getLocStart()); RParenLoc = CommaLocs.empty()? LParenLoc : CommaLocs.back(); return false; } } Sema::OwningExprResult Result = S.SubstExpr(Init, TemplateArgs); if (Result.isInvalid()) return true; NewArgs.push_back(Result.takeAs()); return false; } Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) { // If this is the variable for an anonymous struct or union, // instantiate the anonymous struct/union type first. if (const RecordType *RecordTy = D->getType()->getAs()) if (RecordTy->getDecl()->isAnonymousStructOrUnion()) if (!VisitCXXRecordDecl(cast(RecordTy->getDecl()))) return 0; // Do substitution on the type of the declaration TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs, D->getTypeSpecStartLoc(), D->getDeclName()); if (!DI) return 0; // Build the instantiated declaration VarDecl *Var = VarDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getIdentifier(), DI->getType(), DI, D->getStorageClass(), D->getStorageClassAsWritten()); Var->setThreadSpecified(D->isThreadSpecified()); Var->setCXXDirectInitializer(D->hasCXXDirectInitializer()); Var->setDeclaredInCondition(D->isDeclaredInCondition()); // Substitute the nested name specifier, if any. if (SubstQualifier(D, Var)) return 0; // If we are instantiating a static data member defined // out-of-line, the instantiation will have the same lexical // context (which will be a namespace scope) as the template. if (D->isOutOfLine()) Var->setLexicalDeclContext(D->getLexicalDeclContext()); Var->setAccess(D->getAccess()); Var->setUsed(D->isUsed()); // FIXME: In theory, we could have a previous declaration for variables that // are not static data members. bool Redeclaration = false; // FIXME: having to fake up a LookupResult is dumb. LookupResult Previous(SemaRef, Var->getDeclName(), Var->getLocation(), Sema::LookupOrdinaryName, Sema::ForRedeclaration); if (D->isStaticDataMember()) SemaRef.LookupQualifiedName(Previous, Owner, false); SemaRef.CheckVariableDeclaration(Var, Previous, Redeclaration); if (D->isOutOfLine()) { D->getLexicalDeclContext()->addDecl(Var); Owner->makeDeclVisibleInContext(Var); } else { Owner->addDecl(Var); if (Owner->isFunctionOrMethod()) SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Var); } // Link instantiations of static data members back to the template from // which they were instantiated. if (Var->isStaticDataMember()) SemaRef.Context.setInstantiatedFromStaticDataMember(Var, D, TSK_ImplicitInstantiation); if (Var->getAnyInitializer()) { // We already have an initializer in the class. } else if (D->getInit()) { if (Var->isStaticDataMember() && !D->isOutOfLine()) SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated); else SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); // Instantiate the initializer. SourceLocation LParenLoc, RParenLoc; llvm::SmallVector CommaLocs; ASTOwningVector<&ActionBase::DeleteExpr> InitArgs(SemaRef); if (!InstantiateInitializer(SemaRef, D->getInit(), TemplateArgs, LParenLoc, CommaLocs, InitArgs, RParenLoc)) { // Attach the initializer to the declaration. if (D->hasCXXDirectInitializer()) { // Add the direct initializer to the declaration. SemaRef.AddCXXDirectInitializerToDecl(Sema::DeclPtrTy::make(Var), LParenLoc, move_arg(InitArgs), CommaLocs.data(), RParenLoc); } else if (InitArgs.size() == 1) { Expr *Init = (Expr*)(InitArgs.take()[0]); SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), SemaRef.Owned(Init), false); } else { assert(InitArgs.size() == 0); SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false); } } else { // FIXME: Not too happy about invalidating the declaration // because of a bogus initializer. Var->setInvalidDecl(); } SemaRef.PopExpressionEvaluationContext(); } else if (!Var->isStaticDataMember() || Var->isOutOfLine()) SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false); // Diagnose unused local variables. if (!Var->isInvalidDecl() && Owner->isFunctionOrMethod() && !Var->isUsed()) SemaRef.DiagnoseUnusedDecl(Var); return Var; } Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) { bool Invalid = false; TypeSourceInfo *DI = D->getTypeSourceInfo(); if (DI->getType()->isDependentType() || DI->getType()->isVariablyModifiedType()) { DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), D->getDeclName()); if (!DI) { DI = D->getTypeSourceInfo(); Invalid = true; } else if (DI->getType()->isFunctionType()) { // C++ [temp.arg.type]p3: // If a declaration acquires a function type through a type // dependent on a template-parameter and this causes a // declaration that does not use the syntactic form of a // function declarator to have function type, the program is // ill-formed. SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function) << DI->getType(); Invalid = true; } } else { SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType()); } Expr *BitWidth = D->getBitWidth(); if (Invalid) BitWidth = 0; else if (BitWidth) { // The bit-width expression is not potentially evaluated. EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); OwningExprResult InstantiatedBitWidth = SemaRef.SubstExpr(BitWidth, TemplateArgs); if (InstantiatedBitWidth.isInvalid()) { Invalid = true; BitWidth = 0; } else BitWidth = InstantiatedBitWidth.takeAs(); } FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(), DI->getType(), DI, cast(Owner), D->getLocation(), D->isMutable(), BitWidth, D->getTypeSpecStartLoc(), D->getAccess(), 0); if (!Field) { cast(Owner)->setInvalidDecl(); return 0; } InstantiateAttrs(D, Field); if (Invalid) Field->setInvalidDecl(); if (!Field->getDeclName()) { // Keep track of where this decl came from. SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D); } if (CXXRecordDecl *Parent= dyn_cast(Field->getDeclContext())) { if (Parent->isAnonymousStructOrUnion() && Parent->getLookupContext()->isFunctionOrMethod()) SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Field); } Field->setImplicit(D->isImplicit()); Field->setAccess(D->getAccess()); Owner->addDecl(Field); return Field; } Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) { // Handle friend type expressions by simply substituting template // parameters into the pattern type and checking the result. if (TypeSourceInfo *Ty = D->getFriendType()) { TypeSourceInfo *InstTy = SemaRef.SubstType(Ty, TemplateArgs, D->getLocation(), DeclarationName()); if (!InstTy) return 0; FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getFriendLoc(), InstTy); if (!FD) return 0; FD->setAccess(AS_public); Owner->addDecl(FD); return FD; } NamedDecl *ND = D->getFriendDecl(); assert(ND && "friend decl must be a decl or a type!"); // All of the Visit implementations for the various potential friend // declarations have to be carefully written to work for friend // objects, with the most important detail being that the target // decl should almost certainly not be placed in Owner. Decl *NewND = Visit(ND); if (!NewND) return 0; FriendDecl *FD = FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(), cast(NewND), D->getFriendLoc()); FD->setAccess(AS_public); Owner->addDecl(FD); return FD; } Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) { Expr *AssertExpr = D->getAssertExpr(); // The expression in a static assertion is not potentially evaluated. EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); OwningExprResult InstantiatedAssertExpr = SemaRef.SubstExpr(AssertExpr, TemplateArgs); if (InstantiatedAssertExpr.isInvalid()) return 0; OwningExprResult Message(SemaRef, D->getMessage()); D->getMessage()->Retain(); Decl *StaticAssert = SemaRef.ActOnStaticAssertDeclaration(D->getLocation(), move(InstantiatedAssertExpr), move(Message)).getAs(); return StaticAssert; } Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) { EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getIdentifier(), D->getTagKeywordLoc(), /*PrevDecl=*/0); Enum->setInstantiationOfMemberEnum(D); Enum->setAccess(D->getAccess()); if (SubstQualifier(D, Enum)) return 0; Owner->addDecl(Enum); Enum->startDefinition(); if (D->getDeclContext()->isFunctionOrMethod()) SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum); llvm::SmallVector Enumerators; EnumConstantDecl *LastEnumConst = 0; for (EnumDecl::enumerator_iterator EC = D->enumerator_begin(), ECEnd = D->enumerator_end(); EC != ECEnd; ++EC) { // The specified value for the enumerator. OwningExprResult Value = SemaRef.Owned((Expr *)0); if (Expr *UninstValue = EC->getInitExpr()) { // The enumerator's value expression is not potentially evaluated. EnterExpressionEvaluationContext Unevaluated(SemaRef, Action::Unevaluated); Value = SemaRef.SubstExpr(UninstValue, TemplateArgs); } // Drop the initial value and continue. bool isInvalid = false; if (Value.isInvalid()) { Value = SemaRef.Owned((Expr *)0); isInvalid = true; } EnumConstantDecl *EnumConst = SemaRef.CheckEnumConstant(Enum, LastEnumConst, EC->getLocation(), EC->getIdentifier(), move(Value)); if (isInvalid) { if (EnumConst) EnumConst->setInvalidDecl(); Enum->setInvalidDecl(); } if (EnumConst) { EnumConst->setAccess(Enum->getAccess()); Enum->addDecl(EnumConst); Enumerators.push_back(Sema::DeclPtrTy::make(EnumConst)); LastEnumConst = EnumConst; if (D->getDeclContext()->isFunctionOrMethod()) { // If the enumeration is within a function or method, record the enum // constant as a local. SemaRef.CurrentInstantiationScope->InstantiatedLocal(*EC, EnumConst); } } } // FIXME: Fixup LBraceLoc and RBraceLoc // FIXME: Empty Scope and AttributeList (required to handle attribute packed). SemaRef.ActOnEnumBody(Enum->getLocation(), SourceLocation(), SourceLocation(), Sema::DeclPtrTy::make(Enum), &Enumerators[0], Enumerators.size(), 0, 0); return Enum; } Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) { assert(false && "EnumConstantDecls can only occur within EnumDecls."); return 0; } Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) { bool isFriend = (D->getFriendObjectKind() != Decl::FOK_None); // Create a local instantiation scope for this class template, which // will contain the instantiations of the template parameters. Sema::LocalInstantiationScope Scope(SemaRef); TemplateParameterList *TempParams = D->getTemplateParameters(); TemplateParameterList *InstParams = SubstTemplateParams(TempParams); if (!InstParams) return NULL; CXXRecordDecl *Pattern = D->getTemplatedDecl(); // Instantiate the qualifier. We have to do this first in case // we're a friend declaration, because if we are then we need to put // the new declaration in the appropriate context. NestedNameSpecifier *Qualifier = Pattern->getQualifier(); if (Qualifier) { Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier, Pattern->getQualifierRange(), TemplateArgs); if (!Qualifier) return 0; } CXXRecordDecl *PrevDecl = 0; ClassTemplateDecl *PrevClassTemplate = 0; // If this isn't a friend, then it's a member template, in which // case we just want to build the instantiation in the // specialization. If it is a friend, we want to build it in // the appropriate context. DeclContext *DC = Owner; if (isFriend) { if (Qualifier) { CXXScopeSpec SS; SS.setScopeRep(Qualifier); SS.setRange(Pattern->getQualifierRange()); DC = SemaRef.computeDeclContext(SS); if (!DC) return 0; } else { DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(), Pattern->getDeclContext(), TemplateArgs); } // Look for a previous declaration of the template in the owning // context. LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(), Sema::LookupOrdinaryName, Sema::ForRedeclaration); SemaRef.LookupQualifiedName(R, DC); if (R.isSingleResult()) { PrevClassTemplate = R.getAsSingle(); if (PrevClassTemplate) PrevDecl = PrevClassTemplate->getTemplatedDecl(); } if (!PrevClassTemplate && Qualifier) { SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope) << D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC << Pattern->getQualifierRange(); return 0; } bool AdoptedPreviousTemplateParams = false; if (PrevClassTemplate) { bool Complain = true; // HACK: libstdc++ 4.2.1 contains an ill-formed friend class // template for struct std::tr1::__detail::_Map_base, where the // template parameters of the friend declaration don't match the // template parameters of the original declaration. In this one // case, we don't complain about the ill-formed friend // declaration. if (isFriend && Pattern->getIdentifier() && Pattern->getIdentifier()->isStr("_Map_base") && DC->isNamespace() && cast(DC)->getIdentifier() && cast(DC)->getIdentifier()->isStr("__detail")) { DeclContext *DCParent = DC->getParent(); if (DCParent->isNamespace() && cast(DCParent)->getIdentifier() && cast(DCParent)->getIdentifier()->isStr("tr1")) { DeclContext *DCParent2 = DCParent->getParent(); if (DCParent2->isNamespace() && cast(DCParent2)->getIdentifier() && cast(DCParent2)->getIdentifier()->isStr("std") && DCParent2->getParent()->isTranslationUnit()) Complain = false; } } TemplateParameterList *PrevParams = PrevClassTemplate->getTemplateParameters(); // Make sure the parameter lists match. if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams, Complain, Sema::TPL_TemplateMatch)) { if (Complain) return 0; AdoptedPreviousTemplateParams = true; InstParams = PrevParams; } // Do some additional validation, then merge default arguments // from the existing declarations. if (!AdoptedPreviousTemplateParams && SemaRef.CheckTemplateParameterList(InstParams, PrevParams, Sema::TPC_ClassTemplate)) return 0; } } CXXRecordDecl *RecordInst = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC, Pattern->getLocation(), Pattern->getIdentifier(), Pattern->getTagKeywordLoc(), PrevDecl, /*DelayTypeCreation=*/true); if (Qualifier) RecordInst->setQualifierInfo(Qualifier, Pattern->getQualifierRange()); ClassTemplateDecl *Inst = ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(), D->getIdentifier(), InstParams, RecordInst, PrevClassTemplate); RecordInst->setDescribedClassTemplate(Inst); if (isFriend) { if (PrevClassTemplate) Inst->setAccess(PrevClassTemplate->getAccess()); else Inst->setAccess(D->getAccess()); Inst->setObjectOfFriendDecl(PrevClassTemplate != 0); // TODO: do we want to track the instantiation progeny of this // friend target decl? } else { Inst->setAccess(D->getAccess()); Inst->setInstantiatedFromMemberTemplate(D); } // Trigger creation of the type for the instantiation. SemaRef.Context.getInjectedClassNameType(RecordInst, Inst->getInjectedClassNameSpecialization(SemaRef.Context)); // Finish handling of friends. if (isFriend) { DC->makeDeclVisibleInContext(Inst, /*Recoverable*/ false); return Inst; } Owner->addDecl(Inst); // Instantiate all of the partial specializations of this member class // template. llvm::SmallVector PartialSpecs; D->getPartialSpecializations(PartialSpecs); for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) InstantiateClassTemplatePartialSpecialization(Inst, PartialSpecs[I]); return Inst; } Decl * TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl( ClassTemplatePartialSpecializationDecl *D) { ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate(); // Lookup the already-instantiated declaration in the instantiation // of the class template and return that. DeclContext::lookup_result Found = Owner->lookup(ClassTemplate->getDeclName()); if (Found.first == Found.second) return 0; ClassTemplateDecl *InstClassTemplate = dyn_cast(*Found.first); if (!InstClassTemplate) return 0; Decl *DCanon = D->getCanonicalDecl(); for (llvm::FoldingSet::iterator P = InstClassTemplate->getPartialSpecializations().begin(), PEnd = InstClassTemplate->getPartialSpecializations().end(); P != PEnd; ++P) { if (P->getInstantiatedFromMember()->getCanonicalDecl() == DCanon) return &*P; } return 0; } Decl * TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) { // Create a local instantiation scope for this function template, which // will contain the instantiations of the template parameters and then get // merged with the local instantiation scope for the function template // itself. Sema::LocalInstantiationScope Scope(SemaRef); TemplateParameterList *TempParams = D->getTemplateParameters(); TemplateParameterList *InstParams = SubstTemplateParams(TempParams); if (!InstParams) return NULL; FunctionDecl *Instantiated = 0; if (CXXMethodDecl *DMethod = dyn_cast(D->getTemplatedDecl())) Instantiated = cast_or_null(VisitCXXMethodDecl(DMethod, InstParams)); else Instantiated = cast_or_null(VisitFunctionDecl( D->getTemplatedDecl(), InstParams)); if (!Instantiated) return 0; Instantiated->setAccess(D->getAccess()); // Link the instantiated function template declaration to the function // template from which it was instantiated. FunctionTemplateDecl *InstTemplate = Instantiated->getDescribedFunctionTemplate(); InstTemplate->setAccess(D->getAccess()); assert(InstTemplate && "VisitFunctionDecl/CXXMethodDecl didn't create a template!"); bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None); // Link the instantiation back to the pattern *unless* this is a // non-definition friend declaration. if (!InstTemplate->getInstantiatedFromMemberTemplate() && !(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition())) InstTemplate->setInstantiatedFromMemberTemplate(D); // Make declarations visible in the appropriate context. if (!isFriend) Owner->addDecl(InstTemplate); return InstTemplate; } Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) { CXXRecordDecl *PrevDecl = 0; if (D->isInjectedClassName()) PrevDecl = cast(Owner); else if (D->getPreviousDeclaration()) { NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(), D->getPreviousDeclaration(), TemplateArgs); if (!Prev) return 0; PrevDecl = cast(Prev); } CXXRecordDecl *Record = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner, D->getLocation(), D->getIdentifier(), D->getTagKeywordLoc(), PrevDecl); // Substitute the nested name specifier, if any. if (SubstQualifier(D, Record)) return 0; Record->setImplicit(D->isImplicit()); // FIXME: Check against AS_none is an ugly hack to work around the issue that // the tag decls introduced by friend class declarations don't have an access // specifier. Remove once this area of the code gets sorted out. if (D->getAccess() != AS_none) Record->setAccess(D->getAccess()); if (!D->isInjectedClassName()) Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation); // If the original function was part of a friend declaration, // inherit its namespace state. if (Decl::FriendObjectKind FOK = D->getFriendObjectKind()) Record->setObjectOfFriendDecl(FOK == Decl::FOK_Declared); // Make sure that anonymous structs and unions are recorded. if (D->isAnonymousStructOrUnion()) { Record->setAnonymousStructOrUnion(true); if (Record->getDeclContext()->getLookupContext()->isFunctionOrMethod()) SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record); } Owner->addDecl(Record); return Record; } /// Normal class members are of more specific types and therefore /// don't make it here. This function serves two purposes: /// 1) instantiating function templates /// 2) substituting friend declarations /// FIXME: preserve function definitions in case #2 Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D, TemplateParameterList *TemplateParams) { // Check whether there is already a function template specialization for // this declaration. FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); void *InsertPos = 0; if (FunctionTemplate && !TemplateParams) { llvm::FoldingSetNodeID ID; FunctionTemplateSpecializationInfo::Profile(ID, TemplateArgs.getInnermost().getFlatArgumentList(), TemplateArgs.getInnermost().flat_size(), SemaRef.Context); FunctionTemplateSpecializationInfo *Info = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos); // If we already have a function template specialization, return it. if (Info) return Info->Function; } bool isFriend; if (FunctionTemplate) isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); else isFriend = (D->getFriendObjectKind() != Decl::FOK_None); bool MergeWithParentScope = (TemplateParams != 0) || Owner->isFunctionOrMethod() || !(isa(Owner) && cast(Owner)->isDefinedOutsideFunctionOrMethod()); Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); llvm::SmallVector Params; TypeSourceInfo *TInfo = D->getTypeSourceInfo(); TInfo = SubstFunctionType(D, Params); if (!TInfo) return 0; QualType T = TInfo->getType(); NestedNameSpecifier *Qualifier = D->getQualifier(); if (Qualifier) { Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier, D->getQualifierRange(), TemplateArgs); if (!Qualifier) return 0; } // If we're instantiating a local function declaration, put the result // in the owner; otherwise we need to find the instantiated context. DeclContext *DC; if (D->getDeclContext()->isFunctionOrMethod()) DC = Owner; else if (isFriend && Qualifier) { CXXScopeSpec SS; SS.setScopeRep(Qualifier); SS.setRange(D->getQualifierRange()); DC = SemaRef.computeDeclContext(SS); if (!DC) return 0; } else { DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(), TemplateArgs); } FunctionDecl *Function = FunctionDecl::Create(SemaRef.Context, DC, D->getLocation(), D->getDeclName(), T, TInfo, D->getStorageClass(), D->getStorageClassAsWritten(), D->isInlineSpecified(), D->hasWrittenPrototype()); if (Qualifier) Function->setQualifierInfo(Qualifier, D->getQualifierRange()); DeclContext *LexicalDC = Owner; if (!isFriend && D->isOutOfLine()) { assert(D->getDeclContext()->isFileContext()); LexicalDC = D->getDeclContext(); } Function->setLexicalDeclContext(LexicalDC); // Attach the parameters for (unsigned P = 0; P < Params.size(); ++P) Params[P]->setOwningFunction(Function); Function->setParams(Params.data(), Params.size()); SourceLocation InstantiateAtPOI; if (TemplateParams) { // Our resulting instantiation is actually a function template, since we // are substituting only the outer template parameters. For example, given // // template // struct X { // template friend void f(T, U); // }; // // X x; // // We are instantiating the friend function template "f" within X, // which means substituting int for T, but leaving "f" as a friend function // template. // Build the function template itself. FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC, Function->getLocation(), Function->getDeclName(), TemplateParams, Function); Function->setDescribedFunctionTemplate(FunctionTemplate); FunctionTemplate->setLexicalDeclContext(LexicalDC); if (isFriend && D->isThisDeclarationADefinition()) { // TODO: should we remember this connection regardless of whether // the friend declaration provided a body? FunctionTemplate->setInstantiatedFromMemberTemplate( D->getDescribedFunctionTemplate()); } } else if (FunctionTemplate) { // Record this function template specialization. Function->setFunctionTemplateSpecialization(FunctionTemplate, &TemplateArgs.getInnermost(), InsertPos); } else if (isFriend && D->isThisDeclarationADefinition()) { // TODO: should we remember this connection regardless of whether // the friend declaration provided a body? Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); } if (InitFunctionInstantiation(Function, D)) Function->setInvalidDecl(); bool Redeclaration = false; bool OverloadableAttrRequired = false; bool isExplicitSpecialization = false; LookupResult Previous(SemaRef, Function->getDeclName(), SourceLocation(), Sema::LookupOrdinaryName, Sema::ForRedeclaration); if (DependentFunctionTemplateSpecializationInfo *Info = D->getDependentSpecializationInfo()) { assert(isFriend && "non-friend has dependent specialization info?"); // This needs to be set now for future sanity. Function->setObjectOfFriendDecl(/*HasPrevious*/ true); // Instantiate the explicit template arguments. TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(), Info->getRAngleLoc()); for (unsigned I = 0, E = Info->getNumTemplateArgs(); I != E; ++I) { TemplateArgumentLoc Loc; if (SemaRef.Subst(Info->getTemplateArg(I), Loc, TemplateArgs)) return 0; ExplicitArgs.addArgument(Loc); } // Map the candidate templates to their instantiations. for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) { Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(), Info->getTemplate(I), TemplateArgs); if (!Temp) return 0; Previous.addDecl(cast(Temp)); } if (SemaRef.CheckFunctionTemplateSpecialization(Function, &ExplicitArgs, Previous)) Function->setInvalidDecl(); isExplicitSpecialization = true; } else if (TemplateParams || !FunctionTemplate) { // Look only into the namespace where the friend would be declared to // find a previous declaration. This is the innermost enclosing namespace, // as described in ActOnFriendFunctionDecl. SemaRef.LookupQualifiedName(Previous, DC); // In C++, the previous declaration we find might be a tag type // (class or enum). In this case, the new declaration will hide the // tag type. Note that this does does not apply if we're declaring a // typedef (C++ [dcl.typedef]p4). if (Previous.isSingleTagDecl()) Previous.clear(); } SemaRef.CheckFunctionDeclaration(/*Scope*/ 0, Function, Previous, isExplicitSpecialization, Redeclaration, /*FIXME:*/OverloadableAttrRequired); NamedDecl *PrincipalDecl = (TemplateParams ? cast(FunctionTemplate) : Function); // If the original function was part of a friend declaration, // inherit its namespace state and add it to the owner. if (isFriend) { NamedDecl *PrevDecl; if (TemplateParams) PrevDecl = FunctionTemplate->getPreviousDeclaration(); else PrevDecl = Function->getPreviousDeclaration(); PrincipalDecl->setObjectOfFriendDecl(PrevDecl != 0); DC->makeDeclVisibleInContext(PrincipalDecl, /*Recoverable=*/ false); if (!SemaRef.getLangOptions().CPlusPlus0x && D->isThisDeclarationADefinition()) { // Check for a function body. const FunctionDecl *Definition = 0; if (Function->getBody(Definition) && Definition->getTemplateSpecializationKind() == TSK_Undeclared) { SemaRef.Diag(Function->getLocation(), diag::err_redefinition) << Function->getDeclName(); SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition); Function->setInvalidDecl(); } // Check for redefinitions due to other instantiations of this or // a similar friend function. else for (FunctionDecl::redecl_iterator R = Function->redecls_begin(), REnd = Function->redecls_end(); R != REnd; ++R) { if (*R != Function && ((*R)->getFriendObjectKind() != Decl::FOK_None)) { if (const FunctionDecl *RPattern = (*R)->getTemplateInstantiationPattern()) if (RPattern->getBody(RPattern)) { SemaRef.Diag(Function->getLocation(), diag::err_redefinition) << Function->getDeclName(); SemaRef.Diag((*R)->getLocation(), diag::note_previous_definition); Function->setInvalidDecl(); break; } } } } } if (Function->isOverloadedOperator() && !DC->isRecord() && PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) PrincipalDecl->setNonMemberOperator(); return Function; } Decl * TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D, TemplateParameterList *TemplateParams) { FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate(); void *InsertPos = 0; if (FunctionTemplate && !TemplateParams) { // We are creating a function template specialization from a function // template. Check whether there is already a function template // specialization for this particular set of template arguments. llvm::FoldingSetNodeID ID; FunctionTemplateSpecializationInfo::Profile(ID, TemplateArgs.getInnermost().getFlatArgumentList(), TemplateArgs.getInnermost().flat_size(), SemaRef.Context); FunctionTemplateSpecializationInfo *Info = FunctionTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos); // If we already have a function template specialization, return it. if (Info) return Info->Function; } bool isFriend; if (FunctionTemplate) isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None); else isFriend = (D->getFriendObjectKind() != Decl::FOK_None); bool MergeWithParentScope = (TemplateParams != 0) || !(isa(Owner) && cast(Owner)->isDefinedOutsideFunctionOrMethod()); Sema::LocalInstantiationScope Scope(SemaRef, MergeWithParentScope); llvm::SmallVector Params; TypeSourceInfo *TInfo = D->getTypeSourceInfo(); TInfo = SubstFunctionType(D, Params); if (!TInfo) return 0; QualType T = TInfo->getType(); // \brief If the type of this function is not *directly* a function // type, then we're instantiating the a function that was declared // via a typedef, e.g., // // typedef int functype(int, int); // functype func; // // In this case, we'll just go instantiate the ParmVarDecls that we // synthesized in the method declaration. if (!isa(T)) { assert(!Params.size() && "Instantiating type could not yield parameters"); for (unsigned I = 0, N = D->getNumParams(); I != N; ++I) { ParmVarDecl *P = SemaRef.SubstParmVarDecl(D->getParamDecl(I), TemplateArgs); if (!P) return 0; Params.push_back(P); } } NestedNameSpecifier *Qualifier = D->getQualifier(); if (Qualifier) { Qualifier = SemaRef.SubstNestedNameSpecifier(Qualifier, D->getQualifierRange(), TemplateArgs); if (!Qualifier) return 0; } DeclContext *DC = Owner; if (isFriend) { if (Qualifier) { CXXScopeSpec SS; SS.setScopeRep(Qualifier); SS.setRange(D->getQualifierRange()); DC = SemaRef.computeDeclContext(SS); } else { DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(), TemplateArgs); } if (!DC) return 0; } // Build the instantiated method declaration. CXXRecordDecl *Record = cast(DC); CXXMethodDecl *Method = 0; DeclarationName Name = D->getDeclName(); if (CXXConstructorDecl *Constructor = dyn_cast(D)) { QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); Name = SemaRef.Context.DeclarationNames.getCXXConstructorName( SemaRef.Context.getCanonicalType(ClassTy)); Method = CXXConstructorDecl::Create(SemaRef.Context, Record, Constructor->getLocation(), Name, T, TInfo, Constructor->isExplicit(), Constructor->isInlineSpecified(), false); } else if (CXXDestructorDecl *Destructor = dyn_cast(D)) { QualType ClassTy = SemaRef.Context.getTypeDeclType(Record); Name = SemaRef.Context.DeclarationNames.getCXXDestructorName( SemaRef.Context.getCanonicalType(ClassTy)); Method = CXXDestructorDecl::Create(SemaRef.Context, Record, Destructor->getLocation(), Name, T, Destructor->isInlineSpecified(), false); } else if (CXXConversionDecl *Conversion = dyn_cast(D)) { CanQualType ConvTy = SemaRef.Context.getCanonicalType( T->getAs()->getResultType()); Name = SemaRef.Context.DeclarationNames.getCXXConversionFunctionName( ConvTy); Method = CXXConversionDecl::Create(SemaRef.Context, Record, Conversion->getLocation(), Name, T, TInfo, Conversion->isInlineSpecified(), Conversion->isExplicit()); } else { Method = CXXMethodDecl::Create(SemaRef.Context, Record, D->getLocation(), D->getDeclName(), T, TInfo, D->isStatic(), D->getStorageClassAsWritten(), D->isInlineSpecified()); } if (Qualifier) Method->setQualifierInfo(Qualifier, D->getQualifierRange()); if (TemplateParams) { // Our resulting instantiation is actually a function template, since we // are substituting only the outer template parameters. For example, given // // template // struct X { // template void f(T, U); // }; // // X x; // // We are instantiating the member template "f" within X, which means // substituting int for T, but leaving "f" as a member function template. // Build the function template itself. FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record, Method->getLocation(), Method->getDeclName(), TemplateParams, Method); if (isFriend) { FunctionTemplate->setLexicalDeclContext(Owner); FunctionTemplate->setObjectOfFriendDecl(true); } else if (D->isOutOfLine()) FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext()); Method->setDescribedFunctionTemplate(FunctionTemplate); } else if (FunctionTemplate) { // Record this function template specialization. Method->setFunctionTemplateSpecialization(FunctionTemplate, &TemplateArgs.getInnermost(), InsertPos); } else if (!isFriend) { // Record that this is an instantiation of a member function. Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation); } // If we are instantiating a member function defined // out-of-line, the instantiation will have the same lexical // context (which will be a namespace scope) as the template. if (isFriend) { Method->setLexicalDeclContext(Owner); Method->setObjectOfFriendDecl(true); } else if (D->isOutOfLine()) Method->setLexicalDeclContext(D->getLexicalDeclContext()); // Attach the parameters for (unsigned P = 0; P < Params.size(); ++P) Params[P]->setOwningFunction(Method); Method->setParams(Params.data(), Params.size()); if (InitMethodInstantiation(Method, D)) Method->setInvalidDecl(); LookupResult Previous(SemaRef, Name, SourceLocation(), Sema::LookupOrdinaryName, Sema::ForRedeclaration); if (!FunctionTemplate || TemplateParams || isFriend) { SemaRef.LookupQualifiedName(Previous, Record); // In C++, the previous declaration we find might be a tag type // (class or enum). In this case, the new declaration will hide the // tag type. Note that this does does not apply if we're declaring a // typedef (C++ [dcl.typedef]p4). if (Previous.isSingleTagDecl()) Previous.clear(); } bool Redeclaration = false; bool OverloadableAttrRequired = false; SemaRef.CheckFunctionDeclaration(0, Method, Previous, false, Redeclaration, /*FIXME:*/OverloadableAttrRequired); if (D->isPure()) SemaRef.CheckPureMethod(Method, SourceRange()); Method->setAccess(D->getAccess()); if (FunctionTemplate) { // If there's a function template, let our caller handle it. } else if (Method->isInvalidDecl() && !Previous.empty()) { // Don't hide a (potentially) valid declaration with an invalid one. } else { NamedDecl *DeclToAdd = (TemplateParams ? cast(FunctionTemplate) : Method); if (isFriend) Record->makeDeclVisibleInContext(DeclToAdd); else Owner->addDecl(DeclToAdd); } return Method; } Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) { return VisitCXXMethodDecl(D); } Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) { return VisitCXXMethodDecl(D); } Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) { return VisitCXXMethodDecl(D); } ParmVarDecl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) { return SemaRef.SubstParmVarDecl(D, TemplateArgs); } Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl( TemplateTypeParmDecl *D) { // TODO: don't always clone when decls are refcounted. const Type* T = D->getTypeForDecl(); assert(T->isTemplateTypeParmType()); const TemplateTypeParmType *TTPT = T->getAs(); TemplateTypeParmDecl *Inst = TemplateTypeParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), TTPT->getDepth() - 1, TTPT->getIndex(), TTPT->getName(), D->wasDeclaredWithTypename(), D->isParameterPack()); if (D->hasDefaultArgument()) Inst->setDefaultArgument(D->getDefaultArgumentInfo(), false); // Introduce this template parameter's instantiation into the instantiation // scope. SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst); return Inst; } Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl( NonTypeTemplateParmDecl *D) { // Substitute into the type of the non-type template parameter. QualType T; TypeSourceInfo *DI = D->getTypeSourceInfo(); if (DI) { DI = SemaRef.SubstType(DI, TemplateArgs, D->getLocation(), D->getDeclName()); if (DI) T = DI->getType(); } else { T = SemaRef.SubstType(D->getType(), TemplateArgs, D->getLocation(), D->getDeclName()); DI = 0; } if (T.isNull()) return 0; // Check that this type is acceptable for a non-type template parameter. bool Invalid = false; T = SemaRef.CheckNonTypeTemplateParameterType(T, D->getLocation()); if (T.isNull()) { T = SemaRef.Context.IntTy; Invalid = true; } NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getDepth() - 1, D->getPosition(), D->getIdentifier(), T, DI); if (Invalid) Param->setInvalidDecl(); Param->setDefaultArgument(D->getDefaultArgument()); // Introduce this template parameter's instantiation into the instantiation // scope. SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); return Param; } Decl * TemplateDeclInstantiator::VisitTemplateTemplateParmDecl( TemplateTemplateParmDecl *D) { // Instantiate the template parameter list of the template template parameter. TemplateParameterList *TempParams = D->getTemplateParameters(); TemplateParameterList *InstParams; { // Perform the actual substitution of template parameters within a new, // local instantiation scope. Sema::LocalInstantiationScope Scope(SemaRef); InstParams = SubstTemplateParams(TempParams); if (!InstParams) return NULL; } // Build the template template parameter. TemplateTemplateParmDecl *Param = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getDepth() - 1, D->getPosition(), D->getIdentifier(), InstParams); Param->setDefaultArgument(D->getDefaultArgument()); // Introduce this template parameter's instantiation into the instantiation // scope. SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param); return Param; } Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) { // Using directives are never dependent, so they require no explicit UsingDirectiveDecl *Inst = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getNamespaceKeyLocation(), D->getQualifierRange(), D->getQualifier(), D->getIdentLocation(), D->getNominatedNamespace(), D->getCommonAncestor()); Owner->addDecl(Inst); return Inst; } Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) { // The nested name specifier is non-dependent, so no transformation // is required. // We only need to do redeclaration lookups if we're in a class // scope (in fact, it's not really even possible in non-class // scopes). bool CheckRedeclaration = Owner->isRecord(); LookupResult Prev(SemaRef, D->getDeclName(), D->getLocation(), Sema::LookupUsingDeclName, Sema::ForRedeclaration); UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner, D->getLocation(), D->getNestedNameRange(), D->getUsingLocation(), D->getTargetNestedNameDecl(), D->getDeclName(), D->isTypeName()); CXXScopeSpec SS; SS.setScopeRep(D->getTargetNestedNameDecl()); SS.setRange(D->getNestedNameRange()); if (CheckRedeclaration) { Prev.setHideTags(false); SemaRef.LookupQualifiedName(Prev, Owner); // Check for invalid redeclarations. if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLocation(), D->isTypeName(), SS, D->getLocation(), Prev)) NewUD->setInvalidDecl(); } if (!NewUD->isInvalidDecl() && SemaRef.CheckUsingDeclQualifier(D->getUsingLocation(), SS, D->getLocation())) NewUD->setInvalidDecl(); SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D); NewUD->setAccess(D->getAccess()); Owner->addDecl(NewUD); // Don't process the shadow decls for an invalid decl. if (NewUD->isInvalidDecl()) return NewUD; bool isFunctionScope = Owner->isFunctionOrMethod(); // Process the shadow decls. for (UsingDecl::shadow_iterator I = D->shadow_begin(), E = D->shadow_end(); I != E; ++I) { UsingShadowDecl *Shadow = *I; NamedDecl *InstTarget = cast(SemaRef.FindInstantiatedDecl(Shadow->getLocation(), Shadow->getTargetDecl(), TemplateArgs)); if (CheckRedeclaration && SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev)) continue; UsingShadowDecl *InstShadow = SemaRef.BuildUsingShadowDecl(/*Scope*/ 0, NewUD, InstTarget); SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow); if (isFunctionScope) SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow); } return NewUD; } Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) { // Ignore these; we handle them in bulk when processing the UsingDecl. return 0; } Decl * TemplateDeclInstantiator ::VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D) { NestedNameSpecifier *NNS = SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), D->getTargetNestedNameRange(), TemplateArgs); if (!NNS) return 0; CXXScopeSpec SS; SS.setRange(D->getTargetNestedNameRange()); SS.setScopeRep(NNS); NamedDecl *UD = SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), D->getUsingLoc(), SS, D->getLocation(), D->getDeclName(), 0, /*instantiation*/ true, /*typename*/ true, D->getTypenameLoc()); if (UD) SemaRef.Context.setInstantiatedFromUsingDecl(cast(UD), D); return UD; } Decl * TemplateDeclInstantiator ::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) { NestedNameSpecifier *NNS = SemaRef.SubstNestedNameSpecifier(D->getTargetNestedNameSpecifier(), D->getTargetNestedNameRange(), TemplateArgs); if (!NNS) return 0; CXXScopeSpec SS; SS.setRange(D->getTargetNestedNameRange()); SS.setScopeRep(NNS); NamedDecl *UD = SemaRef.BuildUsingDeclaration(/*Scope*/ 0, D->getAccess(), D->getUsingLoc(), SS, D->getLocation(), D->getDeclName(), 0, /*instantiation*/ true, /*typename*/ false, SourceLocation()); if (UD) SemaRef.Context.setInstantiatedFromUsingDecl(cast(UD), D); return UD; } Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner, const MultiLevelTemplateArgumentList &TemplateArgs) { TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs); if (D->isInvalidDecl()) return 0; return Instantiator.Visit(D); } /// \brief Instantiates a nested template parameter list in the current /// instantiation context. /// /// \param L The parameter list to instantiate /// /// \returns NULL if there was an error TemplateParameterList * TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) { // Get errors for all the parameters before bailing out. bool Invalid = false; unsigned N = L->size(); typedef llvm::SmallVector ParamVector; ParamVector Params; Params.reserve(N); for (TemplateParameterList::iterator PI = L->begin(), PE = L->end(); PI != PE; ++PI) { NamedDecl *D = cast_or_null(Visit(*PI)); Params.push_back(D); Invalid = Invalid || !D || D->isInvalidDecl(); } // Clean up if we had an error. if (Invalid) { for (ParamVector::iterator PI = Params.begin(), PE = Params.end(); PI != PE; ++PI) if (*PI) (*PI)->Destroy(SemaRef.Context); return NULL; } TemplateParameterList *InstL = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(), L->getLAngleLoc(), &Params.front(), N, L->getRAngleLoc()); return InstL; } /// \brief Instantiate the declaration of a class template partial /// specialization. /// /// \param ClassTemplate the (instantiated) class template that is partially // specialized by the instantiation of \p PartialSpec. /// /// \param PartialSpec the (uninstantiated) class template partial /// specialization that we are instantiating. /// /// \returns true if there was an error, false otherwise. bool TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization( ClassTemplateDecl *ClassTemplate, ClassTemplatePartialSpecializationDecl *PartialSpec) { // Create a local instantiation scope for this class template partial // specialization, which will contain the instantiations of the template // parameters. Sema::LocalInstantiationScope Scope(SemaRef); // Substitute into the template parameters of the class template partial // specialization. TemplateParameterList *TempParams = PartialSpec->getTemplateParameters(); TemplateParameterList *InstParams = SubstTemplateParams(TempParams); if (!InstParams) return true; // Substitute into the template arguments of the class template partial // specialization. const TemplateArgumentLoc *PartialSpecTemplateArgs = PartialSpec->getTemplateArgsAsWritten(); unsigned N = PartialSpec->getNumTemplateArgsAsWritten(); TemplateArgumentListInfo InstTemplateArgs; // no angle locations for (unsigned I = 0; I != N; ++I) { TemplateArgumentLoc Loc; if (SemaRef.Subst(PartialSpecTemplateArgs[I], Loc, TemplateArgs)) return true; InstTemplateArgs.addArgument(Loc); } // Check that the template argument list is well-formed for this // class template. TemplateArgumentListBuilder Converted(ClassTemplate->getTemplateParameters(), InstTemplateArgs.size()); if (SemaRef.CheckTemplateArgumentList(ClassTemplate, PartialSpec->getLocation(), InstTemplateArgs, false, Converted)) return true; // Figure out where to insert this class template partial specialization // in the member template's set of class template partial specializations. llvm::FoldingSetNodeID ID; ClassTemplatePartialSpecializationDecl::Profile(ID, Converted.getFlatArguments(), Converted.flatSize(), SemaRef.Context); void *InsertPos = 0; ClassTemplateSpecializationDecl *PrevDecl = ClassTemplate->getPartialSpecializations().FindNodeOrInsertPos(ID, InsertPos); // Build the canonical type that describes the converted template // arguments of the class template partial specialization. QualType CanonType = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate), Converted.getFlatArguments(), Converted.flatSize()); // Build the fully-sugared type for this class template // specialization as the user wrote in the specialization // itself. This means that we'll pretty-print the type retrieved // from the specialization's declaration the way that the user // actually wrote the specialization, rather than formatting the // name based on the "canonical" representation used to store the // template arguments in the specialization. TypeSourceInfo *WrittenTy = SemaRef.Context.getTemplateSpecializationTypeInfo( TemplateName(ClassTemplate), PartialSpec->getLocation(), InstTemplateArgs, CanonType); if (PrevDecl) { // We've already seen a partial specialization with the same template // parameters and template arguments. This can happen, for example, when // substituting the outer template arguments ends up causing two // class template partial specializations of a member class template // to have identical forms, e.g., // // template // struct Outer { // template struct Inner; // template struct Inner; // template struct Inner; // }; // // Outer outer; // error: the partial specializations of Inner // // have the same signature. SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared) << WrittenTy; SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here) << SemaRef.Context.getTypeDeclType(PrevDecl); return true; } // Create the class template partial specialization declaration. ClassTemplatePartialSpecializationDecl *InstPartialSpec = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context, PartialSpec->getTagKind(), Owner, PartialSpec->getLocation(), InstParams, ClassTemplate, Converted, InstTemplateArgs, CanonType, 0, ClassTemplate->getPartialSpecializations().size()); // Substitute the nested name specifier, if any. if (SubstQualifier(PartialSpec, InstPartialSpec)) return 0; InstPartialSpec->setInstantiatedFromMember(PartialSpec); InstPartialSpec->setTypeAsWritten(WrittenTy); // Add this partial specialization to the set of class template partial // specializations. ClassTemplate->getPartialSpecializations().InsertNode(InstPartialSpec, InsertPos); return false; } TypeSourceInfo* TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D, llvm::SmallVectorImpl &Params) { TypeSourceInfo *OldTInfo = D->getTypeSourceInfo(); assert(OldTInfo && "substituting function without type source info"); assert(Params.empty() && "parameter vector is non-empty at start"); TypeSourceInfo *NewTInfo = SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs, D->getTypeSpecStartLoc(), D->getDeclName()); if (!NewTInfo) return 0; if (NewTInfo != OldTInfo) { // Get parameters from the new type info. TypeLoc OldTL = OldTInfo->getTypeLoc(); if (FunctionProtoTypeLoc *OldProtoLoc = dyn_cast(&OldTL)) { TypeLoc NewTL = NewTInfo->getTypeLoc(); FunctionProtoTypeLoc *NewProtoLoc = cast(&NewTL); assert(NewProtoLoc && "Missing prototype?"); for (unsigned i = 0, i_end = NewProtoLoc->getNumArgs(); i != i_end; ++i) { // FIXME: Variadic templates will break this. Params.push_back(NewProtoLoc->getArg(i)); SemaRef.CurrentInstantiationScope->InstantiatedLocal( OldProtoLoc->getArg(i), NewProtoLoc->getArg(i)); } } } else { // The function type itself was not dependent and therefore no // substitution occurred. However, we still need to instantiate // the function parameters themselves. TypeLoc OldTL = OldTInfo->getTypeLoc(); if (FunctionProtoTypeLoc *OldProtoLoc = dyn_cast(&OldTL)) { for (unsigned i = 0, i_end = OldProtoLoc->getNumArgs(); i != i_end; ++i) { ParmVarDecl *Parm = VisitParmVarDecl(OldProtoLoc->getArg(i)); if (!Parm) return 0; Params.push_back(Parm); } } } return NewTInfo; } /// \brief Initializes the common fields of an instantiation function /// declaration (New) from the corresponding fields of its template (Tmpl). /// /// \returns true if there was an error bool TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New, FunctionDecl *Tmpl) { if (Tmpl->isDeleted()) New->setDeleted(); // If we are performing substituting explicitly-specified template arguments // or deduced template arguments into a function template and we reach this // point, we are now past the point where SFINAE applies and have committed // to keeping the new function template specialization. We therefore // convert the active template instantiation for the function template // into a template instantiation for this specific function template // specialization, which is not a SFINAE context, so that we diagnose any // further errors in the declaration itself. typedef Sema::ActiveTemplateInstantiation ActiveInstType; ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back(); if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution || ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) { if (FunctionTemplateDecl *FunTmpl = dyn_cast((Decl *)ActiveInst.Entity)) { assert(FunTmpl->getTemplatedDecl() == Tmpl && "Deduction from the wrong function template?"); (void) FunTmpl; ActiveInst.Kind = ActiveInstType::TemplateInstantiation; ActiveInst.Entity = reinterpret_cast(New); --SemaRef.NonInstantiationEntries; } } const FunctionProtoType *Proto = Tmpl->getType()->getAs(); assert(Proto && "Function template without prototype?"); if (Proto->hasExceptionSpec() || Proto->hasAnyExceptionSpec() || Proto->getNoReturnAttr()) { // The function has an exception specification or a "noreturn" // attribute. Substitute into each of the exception types. llvm::SmallVector Exceptions; for (unsigned I = 0, N = Proto->getNumExceptions(); I != N; ++I) { // FIXME: Poor location information! QualType T = SemaRef.SubstType(Proto->getExceptionType(I), TemplateArgs, New->getLocation(), New->getDeclName()); if (T.isNull() || SemaRef.CheckSpecifiedExceptionType(T, New->getLocation())) continue; Exceptions.push_back(T); } // Rebuild the function type const FunctionProtoType *NewProto = New->getType()->getAs(); assert(NewProto && "Template instantiation without function prototype?"); New->setType(SemaRef.Context.getFunctionType(NewProto->getResultType(), NewProto->arg_type_begin(), NewProto->getNumArgs(), NewProto->isVariadic(), NewProto->getTypeQuals(), Proto->hasExceptionSpec(), Proto->hasAnyExceptionSpec(), Exceptions.size(), Exceptions.data(), Proto->getExtInfo())); } return false; } /// \brief Initializes common fields of an instantiated method /// declaration (New) from the corresponding fields of its template /// (Tmpl). /// /// \returns true if there was an error bool TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New, CXXMethodDecl *Tmpl) { if (InitFunctionInstantiation(New, Tmpl)) return true; CXXRecordDecl *Record = cast(Owner); New->setAccess(Tmpl->getAccess()); if (Tmpl->isVirtualAsWritten()) Record->setMethodAsVirtual(New); // FIXME: attributes // FIXME: New needs a pointer to Tmpl return false; } /// \brief Instantiate the definition of the given function from its /// template. /// /// \param PointOfInstantiation the point at which the instantiation was /// required. Note that this is not precisely a "point of instantiation" /// for the function, but it's close. /// /// \param Function the already-instantiated declaration of a /// function template specialization or member function of a class template /// specialization. /// /// \param Recursive if true, recursively instantiates any functions that /// are required by this instantiation. /// /// \param DefinitionRequired if true, then we are performing an explicit /// instantiation where the body of the function is required. Complain if /// there is no such body. void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation, FunctionDecl *Function, bool Recursive, bool DefinitionRequired) { if (Function->isInvalidDecl() || Function->getBody()) return; // Never instantiate an explicit specialization. if (Function->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) return; // Find the function body that we'll be substituting. const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern(); Stmt *Pattern = 0; if (PatternDecl) Pattern = PatternDecl->getBody(PatternDecl); if (!Pattern) { if (DefinitionRequired) { if (Function->getPrimaryTemplate()) Diag(PointOfInstantiation, diag::err_explicit_instantiation_undefined_func_template) << Function->getPrimaryTemplate(); else Diag(PointOfInstantiation, diag::err_explicit_instantiation_undefined_member) << 1 << Function->getDeclName() << Function->getDeclContext(); if (PatternDecl) Diag(PatternDecl->getLocation(), diag::note_explicit_instantiation_here); Function->setInvalidDecl(); } return; } // C++0x [temp.explicit]p9: // Except for inline functions, other explicit instantiation declarations // have the effect of suppressing the implicit instantiation of the entity // to which they refer. if (Function->getTemplateSpecializationKind() == TSK_ExplicitInstantiationDeclaration && !PatternDecl->isInlined()) return; InstantiatingTemplate Inst(*this, PointOfInstantiation, Function); if (Inst) return; // If we're performing recursive template instantiation, create our own // queue of pending implicit instantiations that we will instantiate later, // while we're still within our own instantiation context. std::deque SavedPendingImplicitInstantiations; if (Recursive) PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); EnterExpressionEvaluationContext EvalContext(*this, Action::PotentiallyEvaluated); ActOnStartOfFunctionDef(0, DeclPtrTy::make(Function)); // Introduce a new scope where local variable instantiations will be // recorded, unless we're actually a member function within a local // class, in which case we need to merge our results with the parent // scope (of the enclosing function). bool MergeWithParentScope = false; if (CXXRecordDecl *Rec = dyn_cast(Function->getDeclContext())) MergeWithParentScope = Rec->isLocalClass(); LocalInstantiationScope Scope(*this, MergeWithParentScope); // Introduce the instantiated function parameters into the local // instantiation scope. for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) Scope.InstantiatedLocal(PatternDecl->getParamDecl(I), Function->getParamDecl(I)); // Enter the scope of this instantiation. We don't use // PushDeclContext because we don't have a scope. DeclContext *PreviousContext = CurContext; CurContext = Function; MultiLevelTemplateArgumentList TemplateArgs = getTemplateInstantiationArgs(Function, 0, false, PatternDecl); // If this is a constructor, instantiate the member initializers. if (const CXXConstructorDecl *Ctor = dyn_cast(PatternDecl)) { InstantiateMemInitializers(cast(Function), Ctor, TemplateArgs); } // Instantiate the function body. OwningStmtResult Body = SubstStmt(Pattern, TemplateArgs); if (Body.isInvalid()) Function->setInvalidDecl(); ActOnFinishFunctionBody(DeclPtrTy::make(Function), move(Body), /*IsInstantiation=*/true); PerformDependentDiagnostics(PatternDecl, TemplateArgs); CurContext = PreviousContext; DeclGroupRef DG(Function); Consumer.HandleTopLevelDecl(DG); // This class may have local implicit instantiations that need to be // instantiation within this scope. PerformPendingImplicitInstantiations(/*LocalOnly=*/true); Scope.Exit(); if (Recursive) { // Instantiate any pending implicit instantiations found during the // instantiation of this template. PerformPendingImplicitInstantiations(); // Restore the set of pending implicit instantiations. PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); } } /// \brief Instantiate the definition of the given variable from its /// template. /// /// \param PointOfInstantiation the point at which the instantiation was /// required. Note that this is not precisely a "point of instantiation" /// for the function, but it's close. /// /// \param Var the already-instantiated declaration of a static member /// variable of a class template specialization. /// /// \param Recursive if true, recursively instantiates any functions that /// are required by this instantiation. /// /// \param DefinitionRequired if true, then we are performing an explicit /// instantiation where an out-of-line definition of the member variable /// is required. Complain if there is no such definition. void Sema::InstantiateStaticDataMemberDefinition( SourceLocation PointOfInstantiation, VarDecl *Var, bool Recursive, bool DefinitionRequired) { if (Var->isInvalidDecl()) return; // Find the out-of-line definition of this static data member. VarDecl *Def = Var->getInstantiatedFromStaticDataMember(); assert(Def && "This data member was not instantiated from a template?"); assert(Def->isStaticDataMember() && "Not a static data member?"); Def = Def->getOutOfLineDefinition(); if (!Def) { // We did not find an out-of-line definition of this static data member, // so we won't perform any instantiation. Rather, we rely on the user to // instantiate this definition (or provide a specialization for it) in // another translation unit. if (DefinitionRequired) { Def = Var->getInstantiatedFromStaticDataMember(); Diag(PointOfInstantiation, diag::err_explicit_instantiation_undefined_member) << 2 << Var->getDeclName() << Var->getDeclContext(); Diag(Def->getLocation(), diag::note_explicit_instantiation_here); } return; } // Never instantiate an explicit specialization. if (Var->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) return; // C++0x [temp.explicit]p9: // Except for inline functions, other explicit instantiation declarations // have the effect of suppressing the implicit instantiation of the entity // to which they refer. if (Var->getTemplateSpecializationKind() == TSK_ExplicitInstantiationDeclaration) return; InstantiatingTemplate Inst(*this, PointOfInstantiation, Var); if (Inst) return; // If we're performing recursive template instantiation, create our own // queue of pending implicit instantiations that we will instantiate later, // while we're still within our own instantiation context. std::deque SavedPendingImplicitInstantiations; if (Recursive) PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); // Enter the scope of this instantiation. We don't use // PushDeclContext because we don't have a scope. DeclContext *PreviousContext = CurContext; CurContext = Var->getDeclContext(); VarDecl *OldVar = Var; Var = cast_or_null(SubstDecl(Def, Var->getDeclContext(), getTemplateInstantiationArgs(Var))); CurContext = PreviousContext; if (Var) { MemberSpecializationInfo *MSInfo = OldVar->getMemberSpecializationInfo(); assert(MSInfo && "Missing member specialization information?"); Var->setTemplateSpecializationKind(MSInfo->getTemplateSpecializationKind(), MSInfo->getPointOfInstantiation()); DeclGroupRef DG(Var); Consumer.HandleTopLevelDecl(DG); } if (Recursive) { // Instantiate any pending implicit instantiations found during the // instantiation of this template. PerformPendingImplicitInstantiations(); // Restore the set of pending implicit instantiations. PendingImplicitInstantiations.swap(SavedPendingImplicitInstantiations); } } void Sema::InstantiateMemInitializers(CXXConstructorDecl *New, const CXXConstructorDecl *Tmpl, const MultiLevelTemplateArgumentList &TemplateArgs) { llvm::SmallVector NewInits; bool AnyErrors = false; // Instantiate all the initializers. for (CXXConstructorDecl::init_const_iterator Inits = Tmpl->init_begin(), InitsEnd = Tmpl->init_end(); Inits != InitsEnd; ++Inits) { CXXBaseOrMemberInitializer *Init = *Inits; SourceLocation LParenLoc, RParenLoc; ASTOwningVector<&ActionBase::DeleteExpr> NewArgs(*this); llvm::SmallVector CommaLocs; // Instantiate the initializer. if (InstantiateInitializer(*this, Init->getInit(), TemplateArgs, LParenLoc, CommaLocs, NewArgs, RParenLoc)) { AnyErrors = true; continue; } MemInitResult NewInit; if (Init->isBaseInitializer()) { TypeSourceInfo *BaseTInfo = SubstType(Init->getBaseClassInfo(), TemplateArgs, Init->getSourceLocation(), New->getDeclName()); if (!BaseTInfo) { AnyErrors = true; New->setInvalidDecl(); continue; } NewInit = BuildBaseInitializer(BaseTInfo->getType(), BaseTInfo, (Expr **)NewArgs.data(), NewArgs.size(), Init->getLParenLoc(), Init->getRParenLoc(), New->getParent()); } else if (Init->isMemberInitializer()) { FieldDecl *Member; // Is this an anonymous union? if (FieldDecl *UnionInit = Init->getAnonUnionMember()) Member = cast(FindInstantiatedDecl(Init->getMemberLocation(), UnionInit, TemplateArgs)); else Member = cast(FindInstantiatedDecl(Init->getMemberLocation(), Init->getMember(), TemplateArgs)); NewInit = BuildMemberInitializer(Member, (Expr **)NewArgs.data(), NewArgs.size(), Init->getSourceLocation(), Init->getLParenLoc(), Init->getRParenLoc()); } if (NewInit.isInvalid()) { AnyErrors = true; New->setInvalidDecl(); } else { // FIXME: It would be nice if ASTOwningVector had a release function. NewArgs.take(); NewInits.push_back((MemInitTy *)NewInit.get()); } } // Assign all the initializers to the new constructor. ActOnMemInitializers(DeclPtrTy::make(New), /*FIXME: ColonLoc */ SourceLocation(), NewInits.data(), NewInits.size(), AnyErrors); } // TODO: this could be templated if the various decl types used the // same method name. static bool isInstantiationOf(ClassTemplateDecl *Pattern, ClassTemplateDecl *Instance) { Pattern = Pattern->getCanonicalDecl(); do { Instance = Instance->getCanonicalDecl(); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromMemberTemplate(); } while (Instance); return false; } static bool isInstantiationOf(FunctionTemplateDecl *Pattern, FunctionTemplateDecl *Instance) { Pattern = Pattern->getCanonicalDecl(); do { Instance = Instance->getCanonicalDecl(); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromMemberTemplate(); } while (Instance); return false; } static bool isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern, ClassTemplatePartialSpecializationDecl *Instance) { Pattern = cast(Pattern->getCanonicalDecl()); do { Instance = cast( Instance->getCanonicalDecl()); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromMember(); } while (Instance); return false; } static bool isInstantiationOf(CXXRecordDecl *Pattern, CXXRecordDecl *Instance) { Pattern = Pattern->getCanonicalDecl(); do { Instance = Instance->getCanonicalDecl(); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromMemberClass(); } while (Instance); return false; } static bool isInstantiationOf(FunctionDecl *Pattern, FunctionDecl *Instance) { Pattern = Pattern->getCanonicalDecl(); do { Instance = Instance->getCanonicalDecl(); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromMemberFunction(); } while (Instance); return false; } static bool isInstantiationOf(EnumDecl *Pattern, EnumDecl *Instance) { Pattern = Pattern->getCanonicalDecl(); do { Instance = Instance->getCanonicalDecl(); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromMemberEnum(); } while (Instance); return false; } static bool isInstantiationOf(UsingShadowDecl *Pattern, UsingShadowDecl *Instance, ASTContext &C) { return C.getInstantiatedFromUsingShadowDecl(Instance) == Pattern; } static bool isInstantiationOf(UsingDecl *Pattern, UsingDecl *Instance, ASTContext &C) { return C.getInstantiatedFromUsingDecl(Instance) == Pattern; } static bool isInstantiationOf(UnresolvedUsingValueDecl *Pattern, UsingDecl *Instance, ASTContext &C) { return C.getInstantiatedFromUsingDecl(Instance) == Pattern; } static bool isInstantiationOf(UnresolvedUsingTypenameDecl *Pattern, UsingDecl *Instance, ASTContext &C) { return C.getInstantiatedFromUsingDecl(Instance) == Pattern; } static bool isInstantiationOfStaticDataMember(VarDecl *Pattern, VarDecl *Instance) { assert(Instance->isStaticDataMember()); Pattern = Pattern->getCanonicalDecl(); do { Instance = Instance->getCanonicalDecl(); if (Pattern == Instance) return true; Instance = Instance->getInstantiatedFromStaticDataMember(); } while (Instance); return false; } // Other is the prospective instantiation // D is the prospective pattern static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) { if (D->getKind() != Other->getKind()) { if (UnresolvedUsingTypenameDecl *UUD = dyn_cast(D)) { if (UsingDecl *UD = dyn_cast(Other)) { return isInstantiationOf(UUD, UD, Ctx); } } if (UnresolvedUsingValueDecl *UUD = dyn_cast(D)) { if (UsingDecl *UD = dyn_cast(Other)) { return isInstantiationOf(UUD, UD, Ctx); } } return false; } if (CXXRecordDecl *Record = dyn_cast(Other)) return isInstantiationOf(cast(D), Record); if (FunctionDecl *Function = dyn_cast(Other)) return isInstantiationOf(cast(D), Function); if (EnumDecl *Enum = dyn_cast(Other)) return isInstantiationOf(cast(D), Enum); if (VarDecl *Var = dyn_cast(Other)) if (Var->isStaticDataMember()) return isInstantiationOfStaticDataMember(cast(D), Var); if (ClassTemplateDecl *Temp = dyn_cast(Other)) return isInstantiationOf(cast(D), Temp); if (FunctionTemplateDecl *Temp = dyn_cast(Other)) return isInstantiationOf(cast(D), Temp); if (ClassTemplatePartialSpecializationDecl *PartialSpec = dyn_cast(Other)) return isInstantiationOf(cast(D), PartialSpec); if (FieldDecl *Field = dyn_cast(Other)) { if (!Field->getDeclName()) { // This is an unnamed field. return Ctx.getInstantiatedFromUnnamedFieldDecl(Field) == cast(D); } } if (UsingDecl *Using = dyn_cast(Other)) return isInstantiationOf(cast(D), Using, Ctx); if (UsingShadowDecl *Shadow = dyn_cast(Other)) return isInstantiationOf(cast(D), Shadow, Ctx); return D->getDeclName() && isa(Other) && D->getDeclName() == cast(Other)->getDeclName(); } template static NamedDecl *findInstantiationOf(ASTContext &Ctx, NamedDecl *D, ForwardIterator first, ForwardIterator last) { for (; first != last; ++first) if (isInstantiationOf(Ctx, D, *first)) return cast(*first); return 0; } /// \brief Finds the instantiation of the given declaration context /// within the current instantiation. /// /// \returns NULL if there was an error DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC, const MultiLevelTemplateArgumentList &TemplateArgs) { if (NamedDecl *D = dyn_cast(DC)) { Decl* ID = FindInstantiatedDecl(Loc, D, TemplateArgs); return cast_or_null(ID); } else return DC; } /// \brief Find the instantiation of the given declaration within the /// current instantiation. /// /// This routine is intended to be used when \p D is a declaration /// referenced from within a template, that needs to mapped into the /// corresponding declaration within an instantiation. For example, /// given: /// /// \code /// template /// struct X { /// enum Kind { /// KnownValue = sizeof(T) /// }; /// /// bool getKind() const { return KnownValue; } /// }; /// /// template struct X; /// \endcode /// /// In the instantiation of X::getKind(), we need to map the /// EnumConstantDecl for KnownValue (which refers to /// X::::KnownValue) to its instantiation /// (X::::KnownValue). InstantiateCurrentDeclRef() performs /// this mapping from within the instantiation of X. NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D, const MultiLevelTemplateArgumentList &TemplateArgs) { DeclContext *ParentDC = D->getDeclContext(); if (isa(D) || isa(D) || isa(D) || isa(D) || ParentDC->isFunctionOrMethod()) { // D is a local of some kind. Look into the map of local // declarations to their instantiations. return cast(CurrentInstantiationScope->getInstantiationOf(D)); } if (CXXRecordDecl *Record = dyn_cast(D)) { if (!Record->isDependentContext()) return D; // If the RecordDecl is actually the injected-class-name or a // "templated" declaration for a class template, class template // partial specialization, or a member class of a class template, // substitute into the injected-class-name of the class template // or partial specialization to find the new DeclContext. QualType T; ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate(); if (ClassTemplate) { T = ClassTemplate->getInjectedClassNameSpecialization(Context); } else if (ClassTemplatePartialSpecializationDecl *PartialSpec = dyn_cast(Record)) { ClassTemplate = PartialSpec->getSpecializedTemplate(); // If we call SubstType with an InjectedClassNameType here we // can end up in an infinite loop. T = Context.getTypeDeclType(Record); assert(isa(T) && "type of partial specialization is not an InjectedClassNameType"); T = cast(T)->getInjectedSpecializationType(); } if (!T.isNull()) { // Substitute into the injected-class-name to get the type // corresponding to the instantiation we want, which may also be // the current instantiation (if we're in a template // definition). This substitution should never fail, since we // know we can instantiate the injected-class-name or we // wouldn't have gotten to the injected-class-name! // FIXME: Can we use the CurrentInstantiationScope to avoid this // extra instantiation in the common case? T = SubstType(T, TemplateArgs, SourceLocation(), DeclarationName()); assert(!T.isNull() && "Instantiation of injected-class-name cannot fail."); if (!T->isDependentType()) { assert(T->isRecordType() && "Instantiation must produce a record type"); return T->getAs()->getDecl(); } // We are performing "partial" template instantiation to create // the member declarations for the members of a class template // specialization. Therefore, D is actually referring to something // in the current instantiation. Look through the current // context, which contains actual instantiations, to find the // instantiation of the "current instantiation" that D refers // to. bool SawNonDependentContext = false; for (DeclContext *DC = CurContext; !DC->isFileContext(); DC = DC->getParent()) { if (ClassTemplateSpecializationDecl *Spec = dyn_cast(DC)) if (isInstantiationOf(ClassTemplate, Spec->getSpecializedTemplate())) return Spec; if (!DC->isDependentContext()) SawNonDependentContext = true; } // We're performing "instantiation" of a member of the current // instantiation while we are type-checking the // definition. Compute the declaration context and return that. assert(!SawNonDependentContext && "No dependent context while instantiating record"); DeclContext *DC = computeDeclContext(T); assert(DC && "Unable to find declaration for the current instantiation"); return cast(DC); } // Fall through to deal with other dependent record types (e.g., // anonymous unions in class templates). } if (!ParentDC->isDependentContext()) return D; ParentDC = FindInstantiatedContext(Loc, ParentDC, TemplateArgs); if (!ParentDC) return 0; if (ParentDC != D->getDeclContext()) { // We performed some kind of instantiation in the parent context, // so now we need to look into the instantiated parent context to // find the instantiation of the declaration D. // If our context used to be dependent, we may need to instantiate // it before performing lookup into that context. if (CXXRecordDecl *Spec = dyn_cast(ParentDC)) { if (!Spec->isDependentContext()) { QualType T = Context.getTypeDeclType(Spec); const RecordType *Tag = T->getAs(); assert(Tag && "type of non-dependent record is not a RecordType"); if (!Tag->isBeingDefined() && RequireCompleteType(Loc, T, diag::err_incomplete_type)) return 0; } } NamedDecl *Result = 0; if (D->getDeclName()) { DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName()); Result = findInstantiationOf(Context, D, Found.first, Found.second); } else { // Since we don't have a name for the entity we're looking for, // our only option is to walk through all of the declarations to // find that name. This will occur in a few cases: // // - anonymous struct/union within a template // - unnamed class/struct/union/enum within a template // // FIXME: Find a better way to find these instantiations! Result = findInstantiationOf(Context, D, ParentDC->decls_begin(), ParentDC->decls_end()); } // UsingShadowDecls can instantiate to nothing because of using hiding. assert((Result || isa(D) || D->isInvalidDecl() || cast(ParentDC)->isInvalidDecl()) && "Unable to find instantiation of declaration!"); D = Result; } return D; } /// \brief Performs template instantiation for all implicit template /// instantiations we have seen until this point. void Sema::PerformPendingImplicitInstantiations(bool LocalOnly) { while (!PendingLocalImplicitInstantiations.empty() || (!LocalOnly && !PendingImplicitInstantiations.empty())) { PendingImplicitInstantiation Inst; if (PendingLocalImplicitInstantiations.empty()) { Inst = PendingImplicitInstantiations.front(); PendingImplicitInstantiations.pop_front(); } else { Inst = PendingLocalImplicitInstantiations.front(); PendingLocalImplicitInstantiations.pop_front(); } // Instantiate function definitions if (FunctionDecl *Function = dyn_cast(Inst.first)) { PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Function), Function->getLocation(), *this, Context.getSourceManager(), "instantiating function definition"); InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true); continue; } // Instantiate static data member definitions. VarDecl *Var = cast(Inst.first); assert(Var->isStaticDataMember() && "Not a static data member?"); // Don't try to instantiate declarations if the most recent redeclaration // is invalid. if (Var->getMostRecentDeclaration()->isInvalidDecl()) continue; // Check if the most recent declaration has changed the specialization kind // and removed the need for implicit instantiation. switch (Var->getMostRecentDeclaration()->getTemplateSpecializationKind()) { case TSK_Undeclared: assert(false && "Cannot instantitiate an undeclared specialization."); case TSK_ExplicitInstantiationDeclaration: case TSK_ExplicitInstantiationDefinition: case TSK_ExplicitSpecialization: continue; // No longer need implicit instantiation. case TSK_ImplicitInstantiation: break; } PrettyStackTraceActionsDecl CrashInfo(DeclPtrTy::make(Var), Var->getLocation(), *this, Context.getSourceManager(), "instantiating static data member " "definition"); InstantiateStaticDataMemberDefinition(/*FIXME:*/Inst.second, Var, true); } } void Sema::PerformDependentDiagnostics(const DeclContext *Pattern, const MultiLevelTemplateArgumentList &TemplateArgs) { for (DeclContext::ddiag_iterator I = Pattern->ddiag_begin(), E = Pattern->ddiag_end(); I != E; ++I) { DependentDiagnostic *DD = *I; switch (DD->getKind()) { case DependentDiagnostic::Access: HandleDependentAccessCheck(*DD, TemplateArgs); break; } } }