| //===------- SemaTemplateInstantiate.cpp - C++ Template 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. |
| // |
| //===----------------------------------------------------------------------===/ |
| |
| #include "Sema.h" |
| #include "TreeTransform.h" |
| #include "Lookup.h" |
| #include "clang/AST/ASTConsumer.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/AST/DeclTemplate.h" |
| #include "clang/Parse/DeclSpec.h" |
| #include "clang/Basic/LangOptions.h" |
| |
| using namespace clang; |
| |
| //===----------------------------------------------------------------------===/ |
| // Template Instantiation Support |
| //===----------------------------------------------------------------------===/ |
| |
| /// \brief Retrieve the template argument list(s) that should be used to |
| /// instantiate the definition of the given declaration. |
| /// |
| /// \param D the declaration for which we are computing template instantiation |
| /// arguments. |
| /// |
| /// \param Innermost if non-NULL, the innermost template argument list. |
| /// |
| /// \param RelativeToPrimary true if we should get the template |
| /// arguments relative to the primary template, even when we're |
| /// dealing with a specialization. This is only relevant for function |
| /// template specializations. |
| MultiLevelTemplateArgumentList |
| Sema::getTemplateInstantiationArgs(NamedDecl *D, |
| const TemplateArgumentList *Innermost, |
| bool RelativeToPrimary) { |
| // Accumulate the set of template argument lists in this structure. |
| MultiLevelTemplateArgumentList Result; |
| |
| if (Innermost) |
| Result.addOuterTemplateArguments(Innermost); |
| |
| DeclContext *Ctx = dyn_cast<DeclContext>(D); |
| if (!Ctx) |
| Ctx = D->getDeclContext(); |
| |
| while (!Ctx->isFileContext()) { |
| // Add template arguments from a class template instantiation. |
| if (ClassTemplateSpecializationDecl *Spec |
| = dyn_cast<ClassTemplateSpecializationDecl>(Ctx)) { |
| // We're done when we hit an explicit specialization. |
| if (Spec->getSpecializationKind() == TSK_ExplicitSpecialization) |
| break; |
| |
| Result.addOuterTemplateArguments(&Spec->getTemplateInstantiationArgs()); |
| |
| // If this class template specialization was instantiated from a |
| // specialized member that is a class template, we're done. |
| assert(Spec->getSpecializedTemplate() && "No class template?"); |
| if (Spec->getSpecializedTemplate()->isMemberSpecialization()) |
| break; |
| } |
| // Add template arguments from a function template specialization. |
| else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Ctx)) { |
| if (!RelativeToPrimary && |
| Function->getTemplateSpecializationKind() |
| == TSK_ExplicitSpecialization) |
| break; |
| |
| if (const TemplateArgumentList *TemplateArgs |
| = Function->getTemplateSpecializationArgs()) { |
| // Add the template arguments for this specialization. |
| Result.addOuterTemplateArguments(TemplateArgs); |
| |
| // If this function was instantiated from a specialized member that is |
| // a function template, we're done. |
| assert(Function->getPrimaryTemplate() && "No function template?"); |
| if (Function->getPrimaryTemplate()->isMemberSpecialization()) |
| break; |
| } |
| |
| // If this is a friend declaration and it declares an entity at |
| // namespace scope, take arguments from its lexical parent |
| // instead of its semantic parent. |
| if (Function->getFriendObjectKind() && |
| Function->getDeclContext()->isFileContext()) { |
| Ctx = Function->getLexicalDeclContext(); |
| RelativeToPrimary = false; |
| continue; |
| } |
| } |
| |
| Ctx = Ctx->getParent(); |
| RelativeToPrimary = false; |
| } |
| |
| return Result; |
| } |
| |
| bool Sema::ActiveTemplateInstantiation::isInstantiationRecord() const { |
| switch (Kind) { |
| case TemplateInstantiation: |
| case DefaultTemplateArgumentInstantiation: |
| case DefaultFunctionArgumentInstantiation: |
| return true; |
| |
| case ExplicitTemplateArgumentSubstitution: |
| case DeducedTemplateArgumentSubstitution: |
| case PriorTemplateArgumentSubstitution: |
| case DefaultTemplateArgumentChecking: |
| return false; |
| } |
| |
| return true; |
| } |
| |
| Sema::InstantiatingTemplate:: |
| InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, |
| Decl *Entity, |
| SourceRange InstantiationRange) |
| : SemaRef(SemaRef) { |
| |
| Invalid = CheckInstantiationDepth(PointOfInstantiation, |
| InstantiationRange); |
| if (!Invalid) { |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind = ActiveTemplateInstantiation::TemplateInstantiation; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Entity = reinterpret_cast<uintptr_t>(Entity); |
| Inst.TemplateArgs = 0; |
| Inst.NumTemplateArgs = 0; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| } |
| } |
| |
| Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, |
| SourceLocation PointOfInstantiation, |
| TemplateDecl *Template, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| SourceRange InstantiationRange) |
| : SemaRef(SemaRef) { |
| |
| Invalid = CheckInstantiationDepth(PointOfInstantiation, |
| InstantiationRange); |
| if (!Invalid) { |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind |
| = ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Entity = reinterpret_cast<uintptr_t>(Template); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| } |
| } |
| |
| Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, |
| SourceLocation PointOfInstantiation, |
| FunctionTemplateDecl *FunctionTemplate, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| ActiveTemplateInstantiation::InstantiationKind Kind, |
| SourceRange InstantiationRange) |
| : SemaRef(SemaRef) { |
| |
| Invalid = CheckInstantiationDepth(PointOfInstantiation, |
| InstantiationRange); |
| if (!Invalid) { |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind = Kind; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Entity = reinterpret_cast<uintptr_t>(FunctionTemplate); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| |
| if (!Inst.isInstantiationRecord()) |
| ++SemaRef.NonInstantiationEntries; |
| } |
| } |
| |
| Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, |
| SourceLocation PointOfInstantiation, |
| ClassTemplatePartialSpecializationDecl *PartialSpec, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| SourceRange InstantiationRange) |
| : SemaRef(SemaRef) { |
| |
| Invalid = false; |
| |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind = ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Entity = reinterpret_cast<uintptr_t>(PartialSpec); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| |
| assert(!Inst.isInstantiationRecord()); |
| ++SemaRef.NonInstantiationEntries; |
| } |
| |
| Sema::InstantiatingTemplate::InstantiatingTemplate(Sema &SemaRef, |
| SourceLocation PointOfInstantiation, |
| ParmVarDecl *Param, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| SourceRange InstantiationRange) |
| : SemaRef(SemaRef) { |
| |
| Invalid = CheckInstantiationDepth(PointOfInstantiation, InstantiationRange); |
| |
| if (!Invalid) { |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind |
| = ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Entity = reinterpret_cast<uintptr_t>(Param); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| } |
| } |
| |
| Sema::InstantiatingTemplate:: |
| InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, |
| TemplateDecl *Template, |
| NonTypeTemplateParmDecl *Param, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| SourceRange InstantiationRange) : SemaRef(SemaRef) { |
| Invalid = false; |
| |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind = ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Template = Template; |
| Inst.Entity = reinterpret_cast<uintptr_t>(Param); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| |
| assert(!Inst.isInstantiationRecord()); |
| ++SemaRef.NonInstantiationEntries; |
| } |
| |
| Sema::InstantiatingTemplate:: |
| InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, |
| TemplateDecl *Template, |
| TemplateTemplateParmDecl *Param, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| SourceRange InstantiationRange) : SemaRef(SemaRef) { |
| Invalid = false; |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind = ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Template = Template; |
| Inst.Entity = reinterpret_cast<uintptr_t>(Param); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| |
| assert(!Inst.isInstantiationRecord()); |
| ++SemaRef.NonInstantiationEntries; |
| } |
| |
| Sema::InstantiatingTemplate:: |
| InstantiatingTemplate(Sema &SemaRef, SourceLocation PointOfInstantiation, |
| TemplateDecl *Template, |
| NamedDecl *Param, |
| const TemplateArgument *TemplateArgs, |
| unsigned NumTemplateArgs, |
| SourceRange InstantiationRange) : SemaRef(SemaRef) { |
| Invalid = false; |
| |
| ActiveTemplateInstantiation Inst; |
| Inst.Kind = ActiveTemplateInstantiation::DefaultTemplateArgumentChecking; |
| Inst.PointOfInstantiation = PointOfInstantiation; |
| Inst.Template = Template; |
| Inst.Entity = reinterpret_cast<uintptr_t>(Param); |
| Inst.TemplateArgs = TemplateArgs; |
| Inst.NumTemplateArgs = NumTemplateArgs; |
| Inst.InstantiationRange = InstantiationRange; |
| SemaRef.ActiveTemplateInstantiations.push_back(Inst); |
| |
| assert(!Inst.isInstantiationRecord()); |
| ++SemaRef.NonInstantiationEntries; |
| } |
| |
| void Sema::InstantiatingTemplate::Clear() { |
| if (!Invalid) { |
| if (!SemaRef.ActiveTemplateInstantiations.back().isInstantiationRecord()) { |
| assert(SemaRef.NonInstantiationEntries > 0); |
| --SemaRef.NonInstantiationEntries; |
| } |
| |
| SemaRef.ActiveTemplateInstantiations.pop_back(); |
| Invalid = true; |
| } |
| } |
| |
| bool Sema::InstantiatingTemplate::CheckInstantiationDepth( |
| SourceLocation PointOfInstantiation, |
| SourceRange InstantiationRange) { |
| assert(SemaRef.NonInstantiationEntries <= |
| SemaRef.ActiveTemplateInstantiations.size()); |
| if ((SemaRef.ActiveTemplateInstantiations.size() - |
| SemaRef.NonInstantiationEntries) |
| <= SemaRef.getLangOptions().InstantiationDepth) |
| return false; |
| |
| SemaRef.Diag(PointOfInstantiation, |
| diag::err_template_recursion_depth_exceeded) |
| << SemaRef.getLangOptions().InstantiationDepth |
| << InstantiationRange; |
| SemaRef.Diag(PointOfInstantiation, diag::note_template_recursion_depth) |
| << SemaRef.getLangOptions().InstantiationDepth; |
| return true; |
| } |
| |
| /// \brief Prints the current instantiation stack through a series of |
| /// notes. |
| void Sema::PrintInstantiationStack() { |
| // FIXME: In all of these cases, we need to show the template arguments |
| for (llvm::SmallVector<ActiveTemplateInstantiation, 16>::reverse_iterator |
| Active = ActiveTemplateInstantiations.rbegin(), |
| ActiveEnd = ActiveTemplateInstantiations.rend(); |
| Active != ActiveEnd; |
| ++Active) { |
| switch (Active->Kind) { |
| case ActiveTemplateInstantiation::TemplateInstantiation: { |
| Decl *D = reinterpret_cast<Decl *>(Active->Entity); |
| if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { |
| unsigned DiagID = diag::note_template_member_class_here; |
| if (isa<ClassTemplateSpecializationDecl>(Record)) |
| DiagID = diag::note_template_class_instantiation_here; |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| DiagID) |
| << Context.getTypeDeclType(Record) |
| << Active->InstantiationRange; |
| } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) { |
| unsigned DiagID; |
| if (Function->getPrimaryTemplate()) |
| DiagID = diag::note_function_template_spec_here; |
| else |
| DiagID = diag::note_template_member_function_here; |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| DiagID) |
| << Function |
| << Active->InstantiationRange; |
| } else { |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_template_static_data_member_def_here) |
| << cast<VarDecl>(D) |
| << Active->InstantiationRange; |
| } |
| break; |
| } |
| |
| case ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation: { |
| TemplateDecl *Template = cast<TemplateDecl>((Decl *)Active->Entity); |
| std::string TemplateArgsStr |
| = TemplateSpecializationType::PrintTemplateArgumentList( |
| Active->TemplateArgs, |
| Active->NumTemplateArgs, |
| Context.PrintingPolicy); |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_default_arg_instantiation_here) |
| << (Template->getNameAsString() + TemplateArgsStr) |
| << Active->InstantiationRange; |
| break; |
| } |
| |
| case ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution: { |
| FunctionTemplateDecl *FnTmpl |
| = cast<FunctionTemplateDecl>((Decl *)Active->Entity); |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_explicit_template_arg_substitution_here) |
| << FnTmpl << Active->InstantiationRange; |
| break; |
| } |
| |
| case ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution: |
| if (ClassTemplatePartialSpecializationDecl *PartialSpec |
| = dyn_cast<ClassTemplatePartialSpecializationDecl>( |
| (Decl *)Active->Entity)) { |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_partial_spec_deduct_instantiation_here) |
| << Context.getTypeDeclType(PartialSpec) |
| << Active->InstantiationRange; |
| } else { |
| FunctionTemplateDecl *FnTmpl |
| = cast<FunctionTemplateDecl>((Decl *)Active->Entity); |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_function_template_deduction_instantiation_here) |
| << FnTmpl << Active->InstantiationRange; |
| } |
| break; |
| |
| case ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation: { |
| ParmVarDecl *Param = cast<ParmVarDecl>((Decl *)Active->Entity); |
| FunctionDecl *FD = cast<FunctionDecl>(Param->getDeclContext()); |
| |
| std::string TemplateArgsStr |
| = TemplateSpecializationType::PrintTemplateArgumentList( |
| Active->TemplateArgs, |
| Active->NumTemplateArgs, |
| Context.PrintingPolicy); |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_default_function_arg_instantiation_here) |
| << (FD->getNameAsString() + TemplateArgsStr) |
| << Active->InstantiationRange; |
| break; |
| } |
| |
| case ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution: { |
| NamedDecl *Parm = cast<NamedDecl>((Decl *)Active->Entity); |
| std::string Name; |
| if (!Parm->getName().empty()) |
| Name = std::string(" '") + Parm->getName().str() + "'"; |
| |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_prior_template_arg_substitution) |
| << isa<TemplateTemplateParmDecl>(Parm) |
| << Name |
| << getTemplateArgumentBindingsText( |
| Active->Template->getTemplateParameters(), |
| Active->TemplateArgs, |
| Active->NumTemplateArgs) |
| << Active->InstantiationRange; |
| break; |
| } |
| |
| case ActiveTemplateInstantiation::DefaultTemplateArgumentChecking: { |
| Diags.Report(FullSourceLoc(Active->PointOfInstantiation, SourceMgr), |
| diag::note_template_default_arg_checking) |
| << getTemplateArgumentBindingsText( |
| Active->Template->getTemplateParameters(), |
| Active->TemplateArgs, |
| Active->NumTemplateArgs) |
| << Active->InstantiationRange; |
| break; |
| } |
| } |
| } |
| } |
| |
| bool Sema::isSFINAEContext() const { |
| using llvm::SmallVector; |
| for (SmallVector<ActiveTemplateInstantiation, 16>::const_reverse_iterator |
| Active = ActiveTemplateInstantiations.rbegin(), |
| ActiveEnd = ActiveTemplateInstantiations.rend(); |
| Active != ActiveEnd; |
| ++Active) |
| { |
| switch(Active->Kind) { |
| case ActiveTemplateInstantiation::TemplateInstantiation: |
| case ActiveTemplateInstantiation::DefaultFunctionArgumentInstantiation: |
| // This is a template instantiation, so there is no SFINAE. |
| return false; |
| |
| case ActiveTemplateInstantiation::DefaultTemplateArgumentInstantiation: |
| case ActiveTemplateInstantiation::PriorTemplateArgumentSubstitution: |
| case ActiveTemplateInstantiation::DefaultTemplateArgumentChecking: |
| // A default template argument instantiation and substitution into |
| // template parameters with arguments for prior parameters may or may |
| // not be a SFINAE context; look further up the stack. |
| break; |
| |
| case ActiveTemplateInstantiation::ExplicitTemplateArgumentSubstitution: |
| case ActiveTemplateInstantiation::DeducedTemplateArgumentSubstitution: |
| // We're either substitution explicitly-specified template arguments |
| // or deduced template arguments, so SFINAE applies. |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| //===----------------------------------------------------------------------===/ |
| // Template Instantiation for Types |
| //===----------------------------------------------------------------------===/ |
| namespace { |
| class TemplateInstantiator |
| : public TreeTransform<TemplateInstantiator> { |
| const MultiLevelTemplateArgumentList &TemplateArgs; |
| SourceLocation Loc; |
| DeclarationName Entity; |
| |
| public: |
| typedef TreeTransform<TemplateInstantiator> inherited; |
| |
| TemplateInstantiator(Sema &SemaRef, |
| const MultiLevelTemplateArgumentList &TemplateArgs, |
| SourceLocation Loc, |
| DeclarationName Entity) |
| : inherited(SemaRef), TemplateArgs(TemplateArgs), Loc(Loc), |
| Entity(Entity) { } |
| |
| /// \brief Determine whether the given type \p T has already been |
| /// transformed. |
| /// |
| /// For the purposes of template instantiation, a type has already been |
| /// transformed if it is NULL or if it is not dependent. |
| bool AlreadyTransformed(QualType T) { |
| return T.isNull() || !T->isDependentType(); |
| } |
| |
| /// \brief Returns the location of the entity being instantiated, if known. |
| SourceLocation getBaseLocation() { return Loc; } |
| |
| /// \brief Returns the name of the entity being instantiated, if any. |
| DeclarationName getBaseEntity() { return Entity; } |
| |
| /// \brief Sets the "base" location and entity when that |
| /// information is known based on another transformation. |
| void setBase(SourceLocation Loc, DeclarationName Entity) { |
| this->Loc = Loc; |
| this->Entity = Entity; |
| } |
| |
| /// \brief Transform the given declaration by instantiating a reference to |
| /// this declaration. |
| Decl *TransformDecl(SourceLocation Loc, Decl *D); |
| |
| /// \brief Transform the definition of the given declaration by |
| /// instantiating it. |
| Decl *TransformDefinition(SourceLocation Loc, Decl *D); |
| |
| /// \bried Transform the first qualifier within a scope by instantiating the |
| /// declaration. |
| NamedDecl *TransformFirstQualifierInScope(NamedDecl *D, SourceLocation Loc); |
| |
| /// \brief Rebuild the exception declaration and register the declaration |
| /// as an instantiated local. |
| VarDecl *RebuildExceptionDecl(VarDecl *ExceptionDecl, QualType T, |
| TypeSourceInfo *Declarator, |
| IdentifierInfo *Name, |
| SourceLocation Loc, SourceRange TypeRange); |
| |
| /// \brief Check for tag mismatches when instantiating an |
| /// elaborated type. |
| QualType RebuildElaboratedType(QualType T, ElaboratedType::TagKind Tag); |
| |
| Sema::OwningExprResult TransformPredefinedExpr(PredefinedExpr *E); |
| Sema::OwningExprResult TransformDeclRefExpr(DeclRefExpr *E); |
| Sema::OwningExprResult TransformCXXDefaultArgExpr(CXXDefaultArgExpr *E); |
| Sema::OwningExprResult TransformTemplateParmRefExpr(DeclRefExpr *E, |
| NonTypeTemplateParmDecl *D); |
| |
| /// \brief Transforms a template type parameter type by performing |
| /// substitution of the corresponding template type argument. |
| QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB, |
| TemplateTypeParmTypeLoc TL, |
| QualType ObjectType); |
| }; |
| } |
| |
| Decl *TemplateInstantiator::TransformDecl(SourceLocation Loc, Decl *D) { |
| if (!D) |
| return 0; |
| |
| if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(D)) { |
| if (TTP->getDepth() < TemplateArgs.getNumLevels()) { |
| // If the corresponding template argument is NULL or non-existent, it's |
| // because we are performing instantiation from explicitly-specified |
| // template arguments in a function template, but there were some |
| // arguments left unspecified. |
| if (!TemplateArgs.hasTemplateArgument(TTP->getDepth(), |
| TTP->getPosition())) |
| return D; |
| |
| TemplateName Template |
| = TemplateArgs(TTP->getDepth(), TTP->getPosition()).getAsTemplate(); |
| assert(!Template.isNull() && Template.getAsTemplateDecl() && |
| "Wrong kind of template template argument"); |
| return Template.getAsTemplateDecl(); |
| } |
| |
| // Fall through to find the instantiated declaration for this template |
| // template parameter. |
| } |
| |
| return SemaRef.FindInstantiatedDecl(Loc, cast<NamedDecl>(D), TemplateArgs); |
| } |
| |
| Decl *TemplateInstantiator::TransformDefinition(SourceLocation Loc, Decl *D) { |
| Decl *Inst = getSema().SubstDecl(D, getSema().CurContext, TemplateArgs); |
| if (!Inst) |
| return 0; |
| |
| getSema().CurrentInstantiationScope->InstantiatedLocal(D, Inst); |
| return Inst; |
| } |
| |
| NamedDecl * |
| TemplateInstantiator::TransformFirstQualifierInScope(NamedDecl *D, |
| SourceLocation Loc) { |
| // If the first part of the nested-name-specifier was a template type |
| // parameter, instantiate that type parameter down to a tag type. |
| if (TemplateTypeParmDecl *TTPD = dyn_cast_or_null<TemplateTypeParmDecl>(D)) { |
| const TemplateTypeParmType *TTP |
| = cast<TemplateTypeParmType>(getSema().Context.getTypeDeclType(TTPD)); |
| if (TTP->getDepth() < TemplateArgs.getNumLevels()) { |
| QualType T = TemplateArgs(TTP->getDepth(), TTP->getIndex()).getAsType(); |
| if (T.isNull()) |
| return cast_or_null<NamedDecl>(TransformDecl(Loc, D)); |
| |
| if (const TagType *Tag = T->getAs<TagType>()) |
| return Tag->getDecl(); |
| |
| // The resulting type is not a tag; complain. |
| getSema().Diag(Loc, diag::err_nested_name_spec_non_tag) << T; |
| return 0; |
| } |
| } |
| |
| return cast_or_null<NamedDecl>(TransformDecl(Loc, D)); |
| } |
| |
| VarDecl * |
| TemplateInstantiator::RebuildExceptionDecl(VarDecl *ExceptionDecl, |
| QualType T, |
| TypeSourceInfo *Declarator, |
| IdentifierInfo *Name, |
| SourceLocation Loc, |
| SourceRange TypeRange) { |
| VarDecl *Var = inherited::RebuildExceptionDecl(ExceptionDecl, T, Declarator, |
| Name, Loc, TypeRange); |
| if (Var && !Var->isInvalidDecl()) |
| getSema().CurrentInstantiationScope->InstantiatedLocal(ExceptionDecl, Var); |
| return Var; |
| } |
| |
| QualType |
| TemplateInstantiator::RebuildElaboratedType(QualType T, |
| ElaboratedType::TagKind Tag) { |
| if (const TagType *TT = T->getAs<TagType>()) { |
| TagDecl* TD = TT->getDecl(); |
| |
| // FIXME: this location is very wrong; we really need typelocs. |
| SourceLocation TagLocation = TD->getTagKeywordLoc(); |
| |
| // FIXME: type might be anonymous. |
| IdentifierInfo *Id = TD->getIdentifier(); |
| |
| // TODO: should we even warn on struct/class mismatches for this? Seems |
| // like it's likely to produce a lot of spurious errors. |
| if (!SemaRef.isAcceptableTagRedeclaration(TD, Tag, TagLocation, *Id)) { |
| SemaRef.Diag(TagLocation, diag::err_use_with_wrong_tag) |
| << Id |
| << CodeModificationHint::CreateReplacement(SourceRange(TagLocation), |
| TD->getKindName()); |
| SemaRef.Diag(TD->getLocation(), diag::note_previous_use); |
| } |
| } |
| |
| return TreeTransform<TemplateInstantiator>::RebuildElaboratedType(T, Tag); |
| } |
| |
| Sema::OwningExprResult |
| TemplateInstantiator::TransformPredefinedExpr(PredefinedExpr *E) { |
| if (!E->isTypeDependent()) |
| return SemaRef.Owned(E->Retain()); |
| |
| FunctionDecl *currentDecl = getSema().getCurFunctionDecl(); |
| assert(currentDecl && "Must have current function declaration when " |
| "instantiating."); |
| |
| PredefinedExpr::IdentType IT = E->getIdentType(); |
| |
| unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length(); |
| |
| llvm::APInt LengthI(32, Length + 1); |
| QualType ResTy = getSema().Context.CharTy.withConst(); |
| ResTy = getSema().Context.getConstantArrayType(ResTy, LengthI, |
| ArrayType::Normal, 0); |
| PredefinedExpr *PE = |
| new (getSema().Context) PredefinedExpr(E->getLocation(), ResTy, IT); |
| return getSema().Owned(PE); |
| } |
| |
| Sema::OwningExprResult |
| TemplateInstantiator::TransformTemplateParmRefExpr(DeclRefExpr *E, |
| NonTypeTemplateParmDecl *NTTP) { |
| // If the corresponding template argument is NULL or non-existent, it's |
| // because we are performing instantiation from explicitly-specified |
| // template arguments in a function template, but there were some |
| // arguments left unspecified. |
| if (!TemplateArgs.hasTemplateArgument(NTTP->getDepth(), |
| NTTP->getPosition())) |
| return SemaRef.Owned(E->Retain()); |
| |
| const TemplateArgument &Arg = TemplateArgs(NTTP->getDepth(), |
| NTTP->getPosition()); |
| |
| // The template argument itself might be an expression, in which |
| // case we just return that expression. |
| if (Arg.getKind() == TemplateArgument::Expression) |
| return SemaRef.Owned(Arg.getAsExpr()->Retain()); |
| |
| if (Arg.getKind() == TemplateArgument::Declaration) { |
| ValueDecl *VD = cast<ValueDecl>(Arg.getAsDecl()); |
| |
| // Find the instantiation of the template argument. This is |
| // required for nested templates. |
| VD = cast_or_null<ValueDecl>( |
| getSema().FindInstantiatedDecl(E->getLocation(), |
| VD, TemplateArgs)); |
| if (!VD) |
| return SemaRef.ExprError(); |
| |
| // Derive the type we want the substituted decl to have. This had |
| // better be non-dependent, or these checks will have serious problems. |
| QualType TargetType = SemaRef.SubstType(NTTP->getType(), TemplateArgs, |
| E->getLocation(), |
| DeclarationName()); |
| assert(!TargetType.isNull() && "type substitution failed for param type"); |
| assert(!TargetType->isDependentType() && "param type still dependent"); |
| |
| if (VD->getDeclContext()->isRecord() && |
| (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD))) { |
| // If the value is a class member, we might have a pointer-to-member. |
| // Determine whether the non-type template template parameter is of |
| // pointer-to-member type. If so, we need to build an appropriate |
| // expression for a pointer-to-member, since a "normal" DeclRefExpr |
| // would refer to the member itself. |
| if (TargetType->isMemberPointerType()) { |
| QualType ClassType |
| = SemaRef.Context.getTypeDeclType( |
| cast<RecordDecl>(VD->getDeclContext())); |
| NestedNameSpecifier *Qualifier |
| = NestedNameSpecifier::Create(SemaRef.Context, 0, false, |
| ClassType.getTypePtr()); |
| CXXScopeSpec SS; |
| SS.setScopeRep(Qualifier); |
| OwningExprResult RefExpr |
| = SemaRef.BuildDeclRefExpr(VD, |
| VD->getType().getNonReferenceType(), |
| E->getLocation(), |
| &SS); |
| if (RefExpr.isInvalid()) |
| return SemaRef.ExprError(); |
| |
| RefExpr = SemaRef.CreateBuiltinUnaryOp(E->getLocation(), |
| UnaryOperator::AddrOf, |
| move(RefExpr)); |
| assert(!RefExpr.isInvalid() && |
| SemaRef.Context.hasSameType(((Expr*) RefExpr.get())->getType(), |
| TargetType)); |
| return move(RefExpr); |
| } |
| } |
| |
| QualType T = VD->getType().getNonReferenceType(); |
| |
| if (TargetType->isPointerType()) { |
| // C++03 [temp.arg.nontype]p5: |
| // - For a non-type template-parameter of type pointer to |
| // object, qualification conversions and the array-to-pointer |
| // conversion are applied. |
| // - For a non-type template-parameter of type pointer to |
| // function, only the function-to-pointer conversion is |
| // applied. |
| |
| OwningExprResult RefExpr |
| = SemaRef.BuildDeclRefExpr(VD, T, E->getLocation()); |
| if (RefExpr.isInvalid()) |
| return SemaRef.ExprError(); |
| |
| // Decay functions and arrays. |
| Expr *RefE = (Expr *)RefExpr.get(); |
| SemaRef.DefaultFunctionArrayConversion(RefE); |
| if (RefE != RefExpr.get()) { |
| RefExpr.release(); |
| RefExpr = SemaRef.Owned(RefE); |
| } |
| |
| // Qualification conversions. |
| RefExpr.release(); |
| SemaRef.ImpCastExprToType(RefE, TargetType.getUnqualifiedType(), |
| CastExpr::CK_NoOp); |
| return SemaRef.Owned(RefE); |
| } |
| |
| // If the non-type template parameter has reference type, qualify the |
| // resulting declaration reference with the extra qualifiers on the |
| // type that the reference refers to. |
| if (const ReferenceType *TargetRef = TargetType->getAs<ReferenceType>()) |
| T = SemaRef.Context.getQualifiedType(T, |
| TargetRef->getPointeeType().getQualifiers()); |
| |
| return SemaRef.BuildDeclRefExpr(VD, T, E->getLocation()); |
| } |
| |
| assert(Arg.getKind() == TemplateArgument::Integral); |
| QualType T = Arg.getIntegralType(); |
| if (T->isCharType() || T->isWideCharType()) |
| return SemaRef.Owned(new (SemaRef.Context) CharacterLiteral( |
| Arg.getAsIntegral()->getZExtValue(), |
| T->isWideCharType(), |
| T, |
| E->getSourceRange().getBegin())); |
| if (T->isBooleanType()) |
| return SemaRef.Owned(new (SemaRef.Context) CXXBoolLiteralExpr( |
| Arg.getAsIntegral()->getBoolValue(), |
| T, |
| E->getSourceRange().getBegin())); |
| |
| assert(Arg.getAsIntegral()->getBitWidth() == SemaRef.Context.getIntWidth(T)); |
| return SemaRef.Owned(new (SemaRef.Context) IntegerLiteral( |
| *Arg.getAsIntegral(), |
| T, |
| E->getSourceRange().getBegin())); |
| } |
| |
| |
| Sema::OwningExprResult |
| TemplateInstantiator::TransformDeclRefExpr(DeclRefExpr *E) { |
| NamedDecl *D = E->getDecl(); |
| if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(D)) { |
| if (NTTP->getDepth() < TemplateArgs.getNumLevels()) |
| return TransformTemplateParmRefExpr(E, NTTP); |
| |
| // We have a non-type template parameter that isn't fully substituted; |
| // FindInstantiatedDecl will find it in the local instantiation scope. |
| } |
| |
| return TreeTransform<TemplateInstantiator>::TransformDeclRefExpr(E); |
| } |
| |
| Sema::OwningExprResult TemplateInstantiator::TransformCXXDefaultArgExpr( |
| CXXDefaultArgExpr *E) { |
| assert(!cast<FunctionDecl>(E->getParam()->getDeclContext())-> |
| getDescribedFunctionTemplate() && |
| "Default arg expressions are never formed in dependent cases."); |
| return SemaRef.BuildCXXDefaultArgExpr(E->getUsedLocation(), |
| cast<FunctionDecl>(E->getParam()->getDeclContext()), |
| E->getParam()); |
| } |
| |
| |
| QualType |
| TemplateInstantiator::TransformTemplateTypeParmType(TypeLocBuilder &TLB, |
| TemplateTypeParmTypeLoc TL, |
| QualType ObjectType) { |
| TemplateTypeParmType *T = TL.getTypePtr(); |
| if (T->getDepth() < TemplateArgs.getNumLevels()) { |
| // Replace the template type parameter with its corresponding |
| // template argument. |
| |
| // If the corresponding template argument is NULL or doesn't exist, it's |
| // because we are performing instantiation from explicitly-specified |
| // template arguments in a function template class, but there were some |
| // arguments left unspecified. |
| if (!TemplateArgs.hasTemplateArgument(T->getDepth(), T->getIndex())) { |
| TemplateTypeParmTypeLoc NewTL |
| = TLB.push<TemplateTypeParmTypeLoc>(TL.getType()); |
| NewTL.setNameLoc(TL.getNameLoc()); |
| return TL.getType(); |
| } |
| |
| assert(TemplateArgs(T->getDepth(), T->getIndex()).getKind() |
| == TemplateArgument::Type && |
| "Template argument kind mismatch"); |
| |
| QualType Replacement |
| = TemplateArgs(T->getDepth(), T->getIndex()).getAsType(); |
| |
| // TODO: only do this uniquing once, at the start of instantiation. |
| QualType Result |
| = getSema().Context.getSubstTemplateTypeParmType(T, Replacement); |
| SubstTemplateTypeParmTypeLoc NewTL |
| = TLB.push<SubstTemplateTypeParmTypeLoc>(Result); |
| NewTL.setNameLoc(TL.getNameLoc()); |
| return Result; |
| } |
| |
| // The template type parameter comes from an inner template (e.g., |
| // the template parameter list of a member template inside the |
| // template we are instantiating). Create a new template type |
| // parameter with the template "level" reduced by one. |
| QualType Result |
| = getSema().Context.getTemplateTypeParmType(T->getDepth() |
| - TemplateArgs.getNumLevels(), |
| T->getIndex(), |
| T->isParameterPack(), |
| T->getName()); |
| TemplateTypeParmTypeLoc NewTL = TLB.push<TemplateTypeParmTypeLoc>(Result); |
| NewTL.setNameLoc(TL.getNameLoc()); |
| return Result; |
| } |
| |
| /// \brief Perform substitution on the type T with a given set of template |
| /// arguments. |
| /// |
| /// This routine substitutes the given template arguments into the |
| /// type T and produces the instantiated type. |
| /// |
| /// \param T the type into which the template arguments will be |
| /// substituted. If this type is not dependent, it will be returned |
| /// immediately. |
| /// |
| /// \param TemplateArgs the template arguments that will be |
| /// substituted for the top-level template parameters within T. |
| /// |
| /// \param Loc the location in the source code where this substitution |
| /// is being performed. It will typically be the location of the |
| /// declarator (if we're instantiating the type of some declaration) |
| /// or the location of the type in the source code (if, e.g., we're |
| /// instantiating the type of a cast expression). |
| /// |
| /// \param Entity the name of the entity associated with a declaration |
| /// being instantiated (if any). May be empty to indicate that there |
| /// is no such entity (if, e.g., this is a type that occurs as part of |
| /// a cast expression) or that the entity has no name (e.g., an |
| /// unnamed function parameter). |
| /// |
| /// \returns If the instantiation succeeds, the instantiated |
| /// type. Otherwise, produces diagnostics and returns a NULL type. |
| TypeSourceInfo *Sema::SubstType(TypeSourceInfo *T, |
| const MultiLevelTemplateArgumentList &Args, |
| SourceLocation Loc, |
| DeclarationName Entity) { |
| assert(!ActiveTemplateInstantiations.empty() && |
| "Cannot perform an instantiation without some context on the " |
| "instantiation stack"); |
| |
| if (!T->getType()->isDependentType()) |
| return T; |
| |
| TemplateInstantiator Instantiator(*this, Args, Loc, Entity); |
| return Instantiator.TransformType(T); |
| } |
| |
| /// Deprecated form of the above. |
| QualType Sema::SubstType(QualType T, |
| const MultiLevelTemplateArgumentList &TemplateArgs, |
| SourceLocation Loc, DeclarationName Entity) { |
| assert(!ActiveTemplateInstantiations.empty() && |
| "Cannot perform an instantiation without some context on the " |
| "instantiation stack"); |
| |
| // If T is not a dependent type, there is nothing to do. |
| if (!T->isDependentType()) |
| return T; |
| |
| TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, Entity); |
| return Instantiator.TransformType(T); |
| } |
| |
| /// \brief Perform substitution on the base class specifiers of the |
| /// given class template specialization. |
| /// |
| /// Produces a diagnostic and returns true on error, returns false and |
| /// attaches the instantiated base classes to the class template |
| /// specialization if successful. |
| bool |
| Sema::SubstBaseSpecifiers(CXXRecordDecl *Instantiation, |
| CXXRecordDecl *Pattern, |
| const MultiLevelTemplateArgumentList &TemplateArgs) { |
| bool Invalid = false; |
| llvm::SmallVector<CXXBaseSpecifier*, 4> InstantiatedBases; |
| for (ClassTemplateSpecializationDecl::base_class_iterator |
| Base = Pattern->bases_begin(), BaseEnd = Pattern->bases_end(); |
| Base != BaseEnd; ++Base) { |
| if (!Base->getType()->isDependentType()) { |
| const CXXRecordDecl *BaseDecl = |
| cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); |
| |
| // Make sure to set the attributes from the base. |
| SetClassDeclAttributesFromBase(Instantiation, BaseDecl, |
| Base->isVirtual()); |
| |
| InstantiatedBases.push_back(new (Context) CXXBaseSpecifier(*Base)); |
| continue; |
| } |
| |
| QualType BaseType = SubstType(Base->getType(), |
| TemplateArgs, |
| Base->getSourceRange().getBegin(), |
| DeclarationName()); |
| if (BaseType.isNull()) { |
| Invalid = true; |
| continue; |
| } |
| |
| if (CXXBaseSpecifier *InstantiatedBase |
| = CheckBaseSpecifier(Instantiation, |
| Base->getSourceRange(), |
| Base->isVirtual(), |
| Base->getAccessSpecifierAsWritten(), |
| BaseType, |
| /*FIXME: Not totally accurate */ |
| Base->getSourceRange().getBegin())) |
| InstantiatedBases.push_back(InstantiatedBase); |
| else |
| Invalid = true; |
| } |
| |
| if (!Invalid && |
| AttachBaseSpecifiers(Instantiation, InstantiatedBases.data(), |
| InstantiatedBases.size())) |
| Invalid = true; |
| |
| return Invalid; |
| } |
| |
| /// \brief Instantiate the definition of a class from a given pattern. |
| /// |
| /// \param PointOfInstantiation The point of instantiation within the |
| /// source code. |
| /// |
| /// \param Instantiation is the declaration whose definition is being |
| /// instantiated. This will be either a class template specialization |
| /// or a member class of a class template specialization. |
| /// |
| /// \param Pattern is the pattern from which the instantiation |
| /// occurs. This will be either the declaration of a class template or |
| /// the declaration of a member class of a class template. |
| /// |
| /// \param TemplateArgs The template arguments to be substituted into |
| /// the pattern. |
| /// |
| /// \param TSK the kind of implicit or explicit instantiation to perform. |
| /// |
| /// \param Complain whether to complain if the class cannot be instantiated due |
| /// to the lack of a definition. |
| /// |
| /// \returns true if an error occurred, false otherwise. |
| bool |
| Sema::InstantiateClass(SourceLocation PointOfInstantiation, |
| CXXRecordDecl *Instantiation, CXXRecordDecl *Pattern, |
| const MultiLevelTemplateArgumentList &TemplateArgs, |
| TemplateSpecializationKind TSK, |
| bool Complain) { |
| bool Invalid = false; |
| |
| CXXRecordDecl *PatternDef |
| = cast_or_null<CXXRecordDecl>(Pattern->getDefinition()); |
| if (!PatternDef) { |
| if (!Complain) { |
| // Say nothing |
| } else if (Pattern == Instantiation->getInstantiatedFromMemberClass()) { |
| Diag(PointOfInstantiation, |
| diag::err_implicit_instantiate_member_undefined) |
| << Context.getTypeDeclType(Instantiation); |
| Diag(Pattern->getLocation(), diag::note_member_of_template_here); |
| } else { |
| Diag(PointOfInstantiation, diag::err_template_instantiate_undefined) |
| << (TSK != TSK_ImplicitInstantiation) |
| << Context.getTypeDeclType(Instantiation); |
| Diag(Pattern->getLocation(), diag::note_template_decl_here); |
| } |
| return true; |
| } |
| Pattern = PatternDef; |
| |
| // \brief Record the point of instantiation. |
| if (MemberSpecializationInfo *MSInfo |
| = Instantiation->getMemberSpecializationInfo()) { |
| MSInfo->setTemplateSpecializationKind(TSK); |
| MSInfo->setPointOfInstantiation(PointOfInstantiation); |
| } else if (ClassTemplateSpecializationDecl *Spec |
| = dyn_cast<ClassTemplateSpecializationDecl>(Instantiation)) { |
| Spec->setTemplateSpecializationKind(TSK); |
| Spec->setPointOfInstantiation(PointOfInstantiation); |
| } |
| |
| InstantiatingTemplate Inst(*this, PointOfInstantiation, Instantiation); |
| if (Inst) |
| return true; |
| |
| // Enter the scope of this instantiation. We don't use |
| // PushDeclContext because we don't have a scope. |
| DeclContext *PreviousContext = CurContext; |
| CurContext = Instantiation; |
| |
| // Start the definition of this instantiation. |
| Instantiation->startDefinition(); |
| |
| // Do substitution on the base class specifiers. |
| if (SubstBaseSpecifiers(Instantiation, Pattern, TemplateArgs)) |
| Invalid = true; |
| |
| llvm::SmallVector<DeclPtrTy, 4> Fields; |
| for (RecordDecl::decl_iterator Member = Pattern->decls_begin(), |
| MemberEnd = Pattern->decls_end(); |
| Member != MemberEnd; ++Member) { |
| Decl *NewMember = SubstDecl(*Member, Instantiation, TemplateArgs); |
| if (NewMember) { |
| if (FieldDecl *Field = dyn_cast<FieldDecl>(NewMember)) |
| Fields.push_back(DeclPtrTy::make(Field)); |
| else if (NewMember->isInvalidDecl()) |
| Invalid = true; |
| } else { |
| // FIXME: Eventually, a NULL return will mean that one of the |
| // instantiations was a semantic disaster, and we'll want to set Invalid = |
| // true. For now, we expect to skip some members that we can't yet handle. |
| } |
| } |
| |
| // Finish checking fields. |
| ActOnFields(0, Instantiation->getLocation(), DeclPtrTy::make(Instantiation), |
| Fields.data(), Fields.size(), SourceLocation(), SourceLocation(), |
| 0); |
| CheckCompletedCXXClass(Instantiation); |
| if (Instantiation->isInvalidDecl()) |
| Invalid = true; |
| |
| // Exit the scope of this instantiation. |
| CurContext = PreviousContext; |
| |
| // If this is a polymorphic C++ class without a key function, we'll |
| // have to mark all of the virtual members to allow emission of a vtable |
| // in this translation unit. |
| if (Instantiation->isDynamicClass() && |
| !Context.getKeyFunction(Instantiation)) { |
| // Local classes need to have their methods instantiated immediately in |
| // order to have the correct instantiation scope. |
| if (Instantiation->isLocalClass()) { |
| MarkVirtualMembersReferenced(PointOfInstantiation, |
| Instantiation); |
| } else { |
| ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Instantiation, |
| PointOfInstantiation)); |
| } |
| } |
| |
| if (!Invalid) |
| Consumer.HandleTagDeclDefinition(Instantiation); |
| |
| return Invalid; |
| } |
| |
| bool |
| Sema::InstantiateClassTemplateSpecialization( |
| SourceLocation PointOfInstantiation, |
| ClassTemplateSpecializationDecl *ClassTemplateSpec, |
| TemplateSpecializationKind TSK, |
| bool Complain) { |
| // Perform the actual instantiation on the canonical declaration. |
| ClassTemplateSpec = cast<ClassTemplateSpecializationDecl>( |
| ClassTemplateSpec->getCanonicalDecl()); |
| |
| // Check whether we have already instantiated or specialized this class |
| // template specialization. |
| if (ClassTemplateSpec->getSpecializationKind() != TSK_Undeclared) { |
| if (ClassTemplateSpec->getSpecializationKind() == |
| TSK_ExplicitInstantiationDeclaration && |
| TSK == TSK_ExplicitInstantiationDefinition) { |
| // An explicit instantiation definition follows an explicit instantiation |
| // declaration (C++0x [temp.explicit]p10); go ahead and perform the |
| // explicit instantiation. |
| ClassTemplateSpec->setSpecializationKind(TSK); |
| return false; |
| } |
| |
| // We can only instantiate something that hasn't already been |
| // instantiated or specialized. Fail without any diagnostics: our |
| // caller will provide an error message. |
| return true; |
| } |
| |
| if (ClassTemplateSpec->isInvalidDecl()) |
| return true; |
| |
| ClassTemplateDecl *Template = ClassTemplateSpec->getSpecializedTemplate(); |
| CXXRecordDecl *Pattern = 0; |
| |
| // C++ [temp.class.spec.match]p1: |
| // When a class template is used in a context that requires an |
| // instantiation of the class, it is necessary to determine |
| // whether the instantiation is to be generated using the primary |
| // template or one of the partial specializations. This is done by |
| // matching the template arguments of the class template |
| // specialization with the template argument lists of the partial |
| // specializations. |
| typedef std::pair<ClassTemplatePartialSpecializationDecl *, |
| TemplateArgumentList *> MatchResult; |
| llvm::SmallVector<MatchResult, 4> Matched; |
| for (llvm::FoldingSet<ClassTemplatePartialSpecializationDecl>::iterator |
| Partial = Template->getPartialSpecializations().begin(), |
| PartialEnd = Template->getPartialSpecializations().end(); |
| Partial != PartialEnd; |
| ++Partial) { |
| TemplateDeductionInfo Info(Context, PointOfInstantiation); |
| if (TemplateDeductionResult Result |
| = DeduceTemplateArguments(&*Partial, |
| ClassTemplateSpec->getTemplateArgs(), |
| Info)) { |
| // FIXME: Store the failed-deduction information for use in |
| // diagnostics, later. |
| (void)Result; |
| } else { |
| Matched.push_back(std::make_pair(&*Partial, Info.take())); |
| } |
| } |
| |
| if (Matched.size() >= 1) { |
| llvm::SmallVector<MatchResult, 4>::iterator Best = Matched.begin(); |
| if (Matched.size() == 1) { |
| // -- If exactly one matching specialization is found, the |
| // instantiation is generated from that specialization. |
| // We don't need to do anything for this. |
| } else { |
| // -- If more than one matching specialization is found, the |
| // partial order rules (14.5.4.2) are used to determine |
| // whether one of the specializations is more specialized |
| // than the others. If none of the specializations is more |
| // specialized than all of the other matching |
| // specializations, then the use of the class template is |
| // ambiguous and the program is ill-formed. |
| for (llvm::SmallVector<MatchResult, 4>::iterator P = Best + 1, |
| PEnd = Matched.end(); |
| P != PEnd; ++P) { |
| if (getMoreSpecializedPartialSpecialization(P->first, Best->first, |
| PointOfInstantiation) |
| == P->first) |
| Best = P; |
| } |
| |
| // Determine if the best partial specialization is more specialized than |
| // the others. |
| bool Ambiguous = false; |
| for (llvm::SmallVector<MatchResult, 4>::iterator P = Matched.begin(), |
| PEnd = Matched.end(); |
| P != PEnd; ++P) { |
| if (P != Best && |
| getMoreSpecializedPartialSpecialization(P->first, Best->first, |
| PointOfInstantiation) |
| != Best->first) { |
| Ambiguous = true; |
| break; |
| } |
| } |
| |
| if (Ambiguous) { |
| // Partial ordering did not produce a clear winner. Complain. |
| ClassTemplateSpec->setInvalidDecl(); |
| Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous) |
| << ClassTemplateSpec; |
| |
| // Print the matching partial specializations. |
| for (llvm::SmallVector<MatchResult, 4>::iterator P = Matched.begin(), |
| PEnd = Matched.end(); |
| P != PEnd; ++P) |
| Diag(P->first->getLocation(), diag::note_partial_spec_match) |
| << getTemplateArgumentBindingsText(P->first->getTemplateParameters(), |
| *P->second); |
| |
| return true; |
| } |
| } |
| |
| // Instantiate using the best class template partial specialization. |
| ClassTemplatePartialSpecializationDecl *OrigPartialSpec = Best->first; |
| while (OrigPartialSpec->getInstantiatedFromMember()) { |
| // If we've found an explicit specialization of this class template, |
| // stop here and use that as the pattern. |
| if (OrigPartialSpec->isMemberSpecialization()) |
| break; |
| |
| OrigPartialSpec = OrigPartialSpec->getInstantiatedFromMember(); |
| } |
| |
| Pattern = OrigPartialSpec; |
| ClassTemplateSpec->setInstantiationOf(Best->first, Best->second); |
| } else { |
| // -- If no matches are found, the instantiation is generated |
| // from the primary template. |
| ClassTemplateDecl *OrigTemplate = Template; |
| while (OrigTemplate->getInstantiatedFromMemberTemplate()) { |
| // If we've found an explicit specialization of this class template, |
| // stop here and use that as the pattern. |
| if (OrigTemplate->isMemberSpecialization()) |
| break; |
| |
| OrigTemplate = OrigTemplate->getInstantiatedFromMemberTemplate(); |
| } |
| |
| Pattern = OrigTemplate->getTemplatedDecl(); |
| } |
| |
| bool Result = InstantiateClass(PointOfInstantiation, ClassTemplateSpec, |
| Pattern, |
| getTemplateInstantiationArgs(ClassTemplateSpec), |
| TSK, |
| Complain); |
| |
| for (unsigned I = 0, N = Matched.size(); I != N; ++I) { |
| // FIXME: Implement TemplateArgumentList::Destroy! |
| // if (Matched[I].first != Pattern) |
| // Matched[I].second->Destroy(Context); |
| } |
| |
| return Result; |
| } |
| |
| /// \brief Instantiates the definitions of all of the member |
| /// of the given class, which is an instantiation of a class template |
| /// or a member class of a template. |
| void |
| Sema::InstantiateClassMembers(SourceLocation PointOfInstantiation, |
| CXXRecordDecl *Instantiation, |
| const MultiLevelTemplateArgumentList &TemplateArgs, |
| TemplateSpecializationKind TSK) { |
| for (DeclContext::decl_iterator D = Instantiation->decls_begin(), |
| DEnd = Instantiation->decls_end(); |
| D != DEnd; ++D) { |
| bool SuppressNew = false; |
| if (FunctionDecl *Function = dyn_cast<FunctionDecl>(*D)) { |
| if (FunctionDecl *Pattern |
| = Function->getInstantiatedFromMemberFunction()) { |
| MemberSpecializationInfo *MSInfo |
| = Function->getMemberSpecializationInfo(); |
| assert(MSInfo && "No member specialization information?"); |
| if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, |
| Function, |
| MSInfo->getTemplateSpecializationKind(), |
| MSInfo->getPointOfInstantiation(), |
| SuppressNew) || |
| SuppressNew) |
| continue; |
| |
| if (Function->getBody()) |
| continue; |
| |
| if (TSK == TSK_ExplicitInstantiationDefinition) { |
| // C++0x [temp.explicit]p8: |
| // An explicit instantiation definition that names a class template |
| // specialization explicitly instantiates the class template |
| // specialization and is only an explicit instantiation definition |
| // of members whose definition is visible at the point of |
| // instantiation. |
| if (!Pattern->getBody()) |
| continue; |
| |
| Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); |
| |
| InstantiateFunctionDefinition(PointOfInstantiation, Function); |
| } else { |
| Function->setTemplateSpecializationKind(TSK, PointOfInstantiation); |
| } |
| } |
| } else if (VarDecl *Var = dyn_cast<VarDecl>(*D)) { |
| if (Var->isStaticDataMember()) { |
| MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); |
| assert(MSInfo && "No member specialization information?"); |
| if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, |
| Var, |
| MSInfo->getTemplateSpecializationKind(), |
| MSInfo->getPointOfInstantiation(), |
| SuppressNew) || |
| SuppressNew) |
| continue; |
| |
| if (TSK == TSK_ExplicitInstantiationDefinition) { |
| // C++0x [temp.explicit]p8: |
| // An explicit instantiation definition that names a class template |
| // specialization explicitly instantiates the class template |
| // specialization and is only an explicit instantiation definition |
| // of members whose definition is visible at the point of |
| // instantiation. |
| if (!Var->getInstantiatedFromStaticDataMember() |
| ->getOutOfLineDefinition()) |
| continue; |
| |
| Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); |
| InstantiateStaticDataMemberDefinition(PointOfInstantiation, Var); |
| } else { |
| Var->setTemplateSpecializationKind(TSK, PointOfInstantiation); |
| } |
| } |
| } else if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(*D)) { |
| if (Record->isInjectedClassName()) |
| continue; |
| |
| MemberSpecializationInfo *MSInfo = Record->getMemberSpecializationInfo(); |
| assert(MSInfo && "No member specialization information?"); |
| if (CheckSpecializationInstantiationRedecl(PointOfInstantiation, TSK, |
| Record, |
| MSInfo->getTemplateSpecializationKind(), |
| MSInfo->getPointOfInstantiation(), |
| SuppressNew) || |
| SuppressNew) |
| continue; |
| |
| CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); |
| assert(Pattern && "Missing instantiated-from-template information"); |
| |
| if (!Record->getDefinition()) { |
| if (!Pattern->getDefinition()) { |
| // C++0x [temp.explicit]p8: |
| // An explicit instantiation definition that names a class template |
| // specialization explicitly instantiates the class template |
| // specialization and is only an explicit instantiation definition |
| // of members whose definition is visible at the point of |
| // instantiation. |
| if (TSK == TSK_ExplicitInstantiationDeclaration) { |
| MSInfo->setTemplateSpecializationKind(TSK); |
| MSInfo->setPointOfInstantiation(PointOfInstantiation); |
| } |
| |
| continue; |
| } |
| |
| InstantiateClass(PointOfInstantiation, Record, Pattern, |
| TemplateArgs, |
| TSK); |
| } |
| |
| Pattern = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
| if (Pattern) |
| InstantiateClassMembers(PointOfInstantiation, Pattern, TemplateArgs, |
| TSK); |
| } |
| } |
| } |
| |
| /// \brief Instantiate the definitions of all of the members of the |
| /// given class template specialization, which was named as part of an |
| /// explicit instantiation. |
| void |
| Sema::InstantiateClassTemplateSpecializationMembers( |
| SourceLocation PointOfInstantiation, |
| ClassTemplateSpecializationDecl *ClassTemplateSpec, |
| TemplateSpecializationKind TSK) { |
| // C++0x [temp.explicit]p7: |
| // An explicit instantiation that names a class template |
| // specialization is an explicit instantion of the same kind |
| // (declaration or definition) of each of its members (not |
| // including members inherited from base classes) that has not |
| // been previously explicitly specialized in the translation unit |
| // containing the explicit instantiation, except as described |
| // below. |
| InstantiateClassMembers(PointOfInstantiation, ClassTemplateSpec, |
| getTemplateInstantiationArgs(ClassTemplateSpec), |
| TSK); |
| } |
| |
| Sema::OwningStmtResult |
| Sema::SubstStmt(Stmt *S, const MultiLevelTemplateArgumentList &TemplateArgs) { |
| if (!S) |
| return Owned(S); |
| |
| TemplateInstantiator Instantiator(*this, TemplateArgs, |
| SourceLocation(), |
| DeclarationName()); |
| return Instantiator.TransformStmt(S); |
| } |
| |
| Sema::OwningExprResult |
| Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) { |
| if (!E) |
| return Owned(E); |
| |
| TemplateInstantiator Instantiator(*this, TemplateArgs, |
| SourceLocation(), |
| DeclarationName()); |
| return Instantiator.TransformExpr(E); |
| } |
| |
| /// \brief Do template substitution on a nested-name-specifier. |
| NestedNameSpecifier * |
| Sema::SubstNestedNameSpecifier(NestedNameSpecifier *NNS, |
| SourceRange Range, |
| const MultiLevelTemplateArgumentList &TemplateArgs) { |
| TemplateInstantiator Instantiator(*this, TemplateArgs, Range.getBegin(), |
| DeclarationName()); |
| return Instantiator.TransformNestedNameSpecifier(NNS, Range); |
| } |
| |
| TemplateName |
| Sema::SubstTemplateName(TemplateName Name, SourceLocation Loc, |
| const MultiLevelTemplateArgumentList &TemplateArgs) { |
| TemplateInstantiator Instantiator(*this, TemplateArgs, Loc, |
| DeclarationName()); |
| return Instantiator.TransformTemplateName(Name); |
| } |
| |
| bool Sema::Subst(const TemplateArgumentLoc &Input, TemplateArgumentLoc &Output, |
| const MultiLevelTemplateArgumentList &TemplateArgs) { |
| TemplateInstantiator Instantiator(*this, TemplateArgs, SourceLocation(), |
| DeclarationName()); |
| |
| return Instantiator.TransformTemplateArgument(Input, Output); |
| } |
