| //===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===/ |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| //===----------------------------------------------------------------------===/ |
| // |
| // This file implements semantic analysis for C++ templates. |
| //===----------------------------------------------------------------------===/ |
| |
| #include "clang/Sema/SemaInternal.h" |
| #include "clang/Sema/Lookup.h" |
| #include "clang/Sema/Scope.h" |
| #include "clang/Sema/Template.h" |
| #include "clang/Sema/TemplateDeduction.h" |
| #include "TreeTransform.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/AST/ExprCXX.h" |
| #include "clang/AST/DeclFriend.h" |
| #include "clang/AST/DeclTemplate.h" |
| #include "clang/AST/RecursiveASTVisitor.h" |
| #include "clang/AST/TypeVisitor.h" |
| #include "clang/Sema/DeclSpec.h" |
| #include "clang/Sema/ParsedTemplate.h" |
| #include "clang/Basic/LangOptions.h" |
| #include "clang/Basic/PartialDiagnostic.h" |
| #include "llvm/ADT/StringExtras.h" |
| using namespace clang; |
| using namespace sema; |
| |
| // Exported for use by Parser. |
| SourceRange |
| clang::getTemplateParamsRange(TemplateParameterList const * const *Ps, |
| unsigned N) { |
| if (!N) return SourceRange(); |
| return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc()); |
| } |
| |
| /// \brief Determine whether the declaration found is acceptable as the name |
| /// of a template and, if so, return that template declaration. Otherwise, |
| /// returns NULL. |
| static NamedDecl *isAcceptableTemplateName(ASTContext &Context, |
| NamedDecl *Orig) { |
| NamedDecl *D = Orig->getUnderlyingDecl(); |
| |
| if (isa<TemplateDecl>(D)) |
| return Orig; |
| |
| if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { |
| // C++ [temp.local]p1: |
| // Like normal (non-template) classes, class templates have an |
| // injected-class-name (Clause 9). The injected-class-name |
| // can be used with or without a template-argument-list. When |
| // it is used without a template-argument-list, it is |
| // equivalent to the injected-class-name followed by the |
| // template-parameters of the class template enclosed in |
| // <>. When it is used with a template-argument-list, it |
| // refers to the specified class template specialization, |
| // which could be the current specialization or another |
| // specialization. |
| if (Record->isInjectedClassName()) { |
| Record = cast<CXXRecordDecl>(Record->getDeclContext()); |
| if (Record->getDescribedClassTemplate()) |
| return Record->getDescribedClassTemplate(); |
| |
| if (ClassTemplateSpecializationDecl *Spec |
| = dyn_cast<ClassTemplateSpecializationDecl>(Record)) |
| return Spec->getSpecializedTemplate(); |
| } |
| |
| return 0; |
| } |
| |
| return 0; |
| } |
| |
| void Sema::FilterAcceptableTemplateNames(LookupResult &R) { |
| // The set of class templates we've already seen. |
| llvm::SmallPtrSet<ClassTemplateDecl *, 8> ClassTemplates; |
| LookupResult::Filter filter = R.makeFilter(); |
| while (filter.hasNext()) { |
| NamedDecl *Orig = filter.next(); |
| NamedDecl *Repl = isAcceptableTemplateName(Context, Orig); |
| if (!Repl) |
| filter.erase(); |
| else if (Repl != Orig) { |
| |
| // C++ [temp.local]p3: |
| // A lookup that finds an injected-class-name (10.2) can result in an |
| // ambiguity in certain cases (for example, if it is found in more than |
| // one base class). If all of the injected-class-names that are found |
| // refer to specializations of the same class template, and if the name |
| // is used as a template-name, the reference refers to the class |
| // template itself and not a specialization thereof, and is not |
| // ambiguous. |
| if (ClassTemplateDecl *ClassTmpl = dyn_cast<ClassTemplateDecl>(Repl)) |
| if (!ClassTemplates.insert(ClassTmpl)) { |
| filter.erase(); |
| continue; |
| } |
| |
| // FIXME: we promote access to public here as a workaround to |
| // the fact that LookupResult doesn't let us remember that we |
| // found this template through a particular injected class name, |
| // which means we end up doing nasty things to the invariants. |
| // Pretending that access is public is *much* safer. |
| filter.replace(Repl, AS_public); |
| } |
| } |
| filter.done(); |
| } |
| |
| bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R) { |
| for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) |
| if (isAcceptableTemplateName(Context, *I)) |
| return true; |
| |
| return false; |
| } |
| |
| TemplateNameKind Sema::isTemplateName(Scope *S, |
| CXXScopeSpec &SS, |
| bool hasTemplateKeyword, |
| UnqualifiedId &Name, |
| ParsedType ObjectTypePtr, |
| bool EnteringContext, |
| TemplateTy &TemplateResult, |
| bool &MemberOfUnknownSpecialization) { |
| assert(getLangOptions().CPlusPlus && "No template names in C!"); |
| |
| DeclarationName TName; |
| MemberOfUnknownSpecialization = false; |
| |
| switch (Name.getKind()) { |
| case UnqualifiedId::IK_Identifier: |
| TName = DeclarationName(Name.Identifier); |
| break; |
| |
| case UnqualifiedId::IK_OperatorFunctionId: |
| TName = Context.DeclarationNames.getCXXOperatorName( |
| Name.OperatorFunctionId.Operator); |
| break; |
| |
| case UnqualifiedId::IK_LiteralOperatorId: |
| TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier); |
| break; |
| |
| default: |
| return TNK_Non_template; |
| } |
| |
| QualType ObjectType = ObjectTypePtr.get(); |
| |
| LookupResult R(*this, TName, Name.getSourceRange().getBegin(), |
| LookupOrdinaryName); |
| LookupTemplateName(R, S, SS, ObjectType, EnteringContext, |
| MemberOfUnknownSpecialization); |
| if (R.empty()) return TNK_Non_template; |
| if (R.isAmbiguous()) { |
| // Suppress diagnostics; we'll redo this lookup later. |
| R.suppressDiagnostics(); |
| |
| // FIXME: we might have ambiguous templates, in which case we |
| // should at least parse them properly! |
| return TNK_Non_template; |
| } |
| |
| TemplateName Template; |
| TemplateNameKind TemplateKind; |
| |
| unsigned ResultCount = R.end() - R.begin(); |
| if (ResultCount > 1) { |
| // We assume that we'll preserve the qualifier from a function |
| // template name in other ways. |
| Template = Context.getOverloadedTemplateName(R.begin(), R.end()); |
| TemplateKind = TNK_Function_template; |
| |
| // We'll do this lookup again later. |
| R.suppressDiagnostics(); |
| } else { |
| TemplateDecl *TD = cast<TemplateDecl>((*R.begin())->getUnderlyingDecl()); |
| |
| if (SS.isSet() && !SS.isInvalid()) { |
| NestedNameSpecifier *Qualifier |
| = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
| Template = Context.getQualifiedTemplateName(Qualifier, |
| hasTemplateKeyword, TD); |
| } else { |
| Template = TemplateName(TD); |
| } |
| |
| if (isa<FunctionTemplateDecl>(TD)) { |
| TemplateKind = TNK_Function_template; |
| |
| // We'll do this lookup again later. |
| R.suppressDiagnostics(); |
| } else { |
| assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || |
| isa<TypeAliasTemplateDecl>(TD)); |
| TemplateKind = TNK_Type_template; |
| } |
| } |
| |
| TemplateResult = TemplateTy::make(Template); |
| return TemplateKind; |
| } |
| |
| bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II, |
| SourceLocation IILoc, |
| Scope *S, |
| const CXXScopeSpec *SS, |
| TemplateTy &SuggestedTemplate, |
| TemplateNameKind &SuggestedKind) { |
| // We can't recover unless there's a dependent scope specifier preceding the |
| // template name. |
| // FIXME: Typo correction? |
| if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) || |
| computeDeclContext(*SS)) |
| return false; |
| |
| // The code is missing a 'template' keyword prior to the dependent template |
| // name. |
| NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep(); |
| Diag(IILoc, diag::err_template_kw_missing) |
| << Qualifier << II.getName() |
| << FixItHint::CreateInsertion(IILoc, "template "); |
| SuggestedTemplate |
| = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II)); |
| SuggestedKind = TNK_Dependent_template_name; |
| return true; |
| } |
| |
| void Sema::LookupTemplateName(LookupResult &Found, |
| Scope *S, CXXScopeSpec &SS, |
| QualType ObjectType, |
| bool EnteringContext, |
| bool &MemberOfUnknownSpecialization) { |
| // Determine where to perform name lookup |
| MemberOfUnknownSpecialization = false; |
| DeclContext *LookupCtx = 0; |
| bool isDependent = false; |
| if (!ObjectType.isNull()) { |
| // This nested-name-specifier occurs in a member access expression, e.g., |
| // x->B::f, and we are looking into the type of the object. |
| assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist"); |
| LookupCtx = computeDeclContext(ObjectType); |
| isDependent = ObjectType->isDependentType(); |
| assert((isDependent || !ObjectType->isIncompleteType()) && |
| "Caller should have completed object type"); |
| } else if (SS.isSet()) { |
| // This nested-name-specifier occurs after another nested-name-specifier, |
| // so long into the context associated with the prior nested-name-specifier. |
| LookupCtx = computeDeclContext(SS, EnteringContext); |
| isDependent = isDependentScopeSpecifier(SS); |
| |
| // The declaration context must be complete. |
| if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx)) |
| return; |
| } |
| |
| bool ObjectTypeSearchedInScope = false; |
| if (LookupCtx) { |
| // Perform "qualified" name lookup into the declaration context we |
| // computed, which is either the type of the base of a member access |
| // expression or the declaration context associated with a prior |
| // nested-name-specifier. |
| LookupQualifiedName(Found, LookupCtx); |
| |
| if (!ObjectType.isNull() && Found.empty()) { |
| // C++ [basic.lookup.classref]p1: |
| // In a class member access expression (5.2.5), if the . or -> token is |
| // immediately followed by an identifier followed by a <, the |
| // identifier must be looked up to determine whether the < is the |
| // beginning of a template argument list (14.2) or a less-than operator. |
| // The identifier is first looked up in the class of the object |
| // expression. If the identifier is not found, it is then looked up in |
| // the context of the entire postfix-expression and shall name a class |
| // or function template. |
| if (S) LookupName(Found, S); |
| ObjectTypeSearchedInScope = true; |
| } |
| } else if (isDependent && (!S || ObjectType.isNull())) { |
| // We cannot look into a dependent object type or nested nme |
| // specifier. |
| MemberOfUnknownSpecialization = true; |
| return; |
| } else { |
| // Perform unqualified name lookup in the current scope. |
| LookupName(Found, S); |
| } |
| |
| if (Found.empty() && !isDependent) { |
| // If we did not find any names, attempt to correct any typos. |
| DeclarationName Name = Found.getLookupName(); |
| if (DeclarationName Corrected = CorrectTypo(Found, S, &SS, LookupCtx, |
| false, CTC_CXXCasts)) { |
| FilterAcceptableTemplateNames(Found); |
| if (!Found.empty()) { |
| if (LookupCtx) |
| Diag(Found.getNameLoc(), diag::err_no_member_template_suggest) |
| << Name << LookupCtx << Found.getLookupName() << SS.getRange() |
| << FixItHint::CreateReplacement(Found.getNameLoc(), |
| Found.getLookupName().getAsString()); |
| else |
| Diag(Found.getNameLoc(), diag::err_no_template_suggest) |
| << Name << Found.getLookupName() |
| << FixItHint::CreateReplacement(Found.getNameLoc(), |
| Found.getLookupName().getAsString()); |
| if (TemplateDecl *Template = Found.getAsSingle<TemplateDecl>()) |
| Diag(Template->getLocation(), diag::note_previous_decl) |
| << Template->getDeclName(); |
| } |
| } else { |
| Found.clear(); |
| Found.setLookupName(Name); |
| } |
| } |
| |
| FilterAcceptableTemplateNames(Found); |
| if (Found.empty()) { |
| if (isDependent) |
| MemberOfUnknownSpecialization = true; |
| return; |
| } |
| |
| if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope) { |
| // C++ [basic.lookup.classref]p1: |
| // [...] If the lookup in the class of the object expression finds a |
| // template, the name is also looked up in the context of the entire |
| // postfix-expression and [...] |
| // |
| LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(), |
| LookupOrdinaryName); |
| LookupName(FoundOuter, S); |
| FilterAcceptableTemplateNames(FoundOuter); |
| |
| if (FoundOuter.empty()) { |
| // - if the name is not found, the name found in the class of the |
| // object expression is used, otherwise |
| } else if (!FoundOuter.getAsSingle<ClassTemplateDecl>()) { |
| // - if the name is found in the context of the entire |
| // postfix-expression and does not name a class template, the name |
| // found in the class of the object expression is used, otherwise |
| } else if (!Found.isSuppressingDiagnostics()) { |
| // - if the name found is a class template, it must refer to the same |
| // entity as the one found in the class of the object expression, |
| // otherwise the program is ill-formed. |
| if (!Found.isSingleResult() || |
| Found.getFoundDecl()->getCanonicalDecl() |
| != FoundOuter.getFoundDecl()->getCanonicalDecl()) { |
| Diag(Found.getNameLoc(), |
| diag::ext_nested_name_member_ref_lookup_ambiguous) |
| << Found.getLookupName() |
| << ObjectType; |
| Diag(Found.getRepresentativeDecl()->getLocation(), |
| diag::note_ambig_member_ref_object_type) |
| << ObjectType; |
| Diag(FoundOuter.getFoundDecl()->getLocation(), |
| diag::note_ambig_member_ref_scope); |
| |
| // Recover by taking the template that we found in the object |
| // expression's type. |
| } |
| } |
| } |
| } |
| |
| /// ActOnDependentIdExpression - Handle a dependent id-expression that |
| /// was just parsed. This is only possible with an explicit scope |
| /// specifier naming a dependent type. |
| ExprResult |
| Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS, |
| const DeclarationNameInfo &NameInfo, |
| bool isAddressOfOperand, |
| const TemplateArgumentListInfo *TemplateArgs) { |
| DeclContext *DC = getFunctionLevelDeclContext(); |
| |
| if (!isAddressOfOperand && |
| isa<CXXMethodDecl>(DC) && |
| cast<CXXMethodDecl>(DC)->isInstance()) { |
| QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context); |
| |
| // Since the 'this' expression is synthesized, we don't need to |
| // perform the double-lookup check. |
| NamedDecl *FirstQualifierInScope = 0; |
| |
| return Owned(CXXDependentScopeMemberExpr::Create(Context, |
| /*This*/ 0, ThisType, |
| /*IsArrow*/ true, |
| /*Op*/ SourceLocation(), |
| SS.getWithLocInContext(Context), |
| FirstQualifierInScope, |
| NameInfo, |
| TemplateArgs)); |
| } |
| |
| return BuildDependentDeclRefExpr(SS, NameInfo, TemplateArgs); |
| } |
| |
| ExprResult |
| Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS, |
| const DeclarationNameInfo &NameInfo, |
| const TemplateArgumentListInfo *TemplateArgs) { |
| return Owned(DependentScopeDeclRefExpr::Create(Context, |
| SS.getWithLocInContext(Context), |
| NameInfo, |
| TemplateArgs)); |
| } |
| |
| /// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining |
| /// that the template parameter 'PrevDecl' is being shadowed by a new |
| /// declaration at location Loc. Returns true to indicate that this is |
| /// an error, and false otherwise. |
| bool Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) { |
| assert(PrevDecl->isTemplateParameter() && "Not a template parameter"); |
| |
| // Microsoft Visual C++ permits template parameters to be shadowed. |
| if (getLangOptions().Microsoft) |
| return false; |
| |
| // C++ [temp.local]p4: |
| // A template-parameter shall not be redeclared within its |
| // scope (including nested scopes). |
| Diag(Loc, diag::err_template_param_shadow) |
| << cast<NamedDecl>(PrevDecl)->getDeclName(); |
| Diag(PrevDecl->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| /// AdjustDeclIfTemplate - If the given decl happens to be a template, reset |
| /// the parameter D to reference the templated declaration and return a pointer |
| /// to the template declaration. Otherwise, do nothing to D and return null. |
| TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) { |
| if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) { |
| D = Temp->getTemplatedDecl(); |
| return Temp; |
| } |
| return 0; |
| } |
| |
| ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion( |
| SourceLocation EllipsisLoc) const { |
| assert(Kind == Template && |
| "Only template template arguments can be pack expansions here"); |
| assert(getAsTemplate().get().containsUnexpandedParameterPack() && |
| "Template template argument pack expansion without packs"); |
| ParsedTemplateArgument Result(*this); |
| Result.EllipsisLoc = EllipsisLoc; |
| return Result; |
| } |
| |
| static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef, |
| const ParsedTemplateArgument &Arg) { |
| |
| switch (Arg.getKind()) { |
| case ParsedTemplateArgument::Type: { |
| TypeSourceInfo *DI; |
| QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI); |
| if (!DI) |
| DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation()); |
| return TemplateArgumentLoc(TemplateArgument(T), DI); |
| } |
| |
| case ParsedTemplateArgument::NonType: { |
| Expr *E = static_cast<Expr *>(Arg.getAsExpr()); |
| return TemplateArgumentLoc(TemplateArgument(E), E); |
| } |
| |
| case ParsedTemplateArgument::Template: { |
| TemplateName Template = Arg.getAsTemplate().get(); |
| TemplateArgument TArg; |
| if (Arg.getEllipsisLoc().isValid()) |
| TArg = TemplateArgument(Template, llvm::Optional<unsigned int>()); |
| else |
| TArg = Template; |
| return TemplateArgumentLoc(TArg, |
| Arg.getScopeSpec().getWithLocInContext( |
| SemaRef.Context), |
| Arg.getLocation(), |
| Arg.getEllipsisLoc()); |
| } |
| } |
| |
| llvm_unreachable("Unhandled parsed template argument"); |
| return TemplateArgumentLoc(); |
| } |
| |
| /// \brief Translates template arguments as provided by the parser |
| /// into template arguments used by semantic analysis. |
| void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn, |
| TemplateArgumentListInfo &TemplateArgs) { |
| for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I) |
| TemplateArgs.addArgument(translateTemplateArgument(*this, |
| TemplateArgsIn[I])); |
| } |
| |
| /// ActOnTypeParameter - Called when a C++ template type parameter |
| /// (e.g., "typename T") has been parsed. Typename specifies whether |
| /// the keyword "typename" was used to declare the type parameter |
| /// (otherwise, "class" was used), and KeyLoc is the location of the |
| /// "class" or "typename" keyword. ParamName is the name of the |
| /// parameter (NULL indicates an unnamed template parameter) and |
| /// ParamNameLoc is the location of the parameter name (if any). |
| /// If the type parameter has a default argument, it will be added |
| /// later via ActOnTypeParameterDefault. |
| Decl *Sema::ActOnTypeParameter(Scope *S, bool Typename, bool Ellipsis, |
| SourceLocation EllipsisLoc, |
| SourceLocation KeyLoc, |
| IdentifierInfo *ParamName, |
| SourceLocation ParamNameLoc, |
| unsigned Depth, unsigned Position, |
| SourceLocation EqualLoc, |
| ParsedType DefaultArg) { |
| assert(S->isTemplateParamScope() && |
| "Template type parameter not in template parameter scope!"); |
| bool Invalid = false; |
| |
| if (ParamName) { |
| NamedDecl *PrevDecl = LookupSingleName(S, ParamName, ParamNameLoc, |
| LookupOrdinaryName, |
| ForRedeclaration); |
| if (PrevDecl && PrevDecl->isTemplateParameter()) |
| Invalid = Invalid || DiagnoseTemplateParameterShadow(ParamNameLoc, |
| PrevDecl); |
| } |
| |
| SourceLocation Loc = ParamNameLoc; |
| if (!ParamName) |
| Loc = KeyLoc; |
| |
| TemplateTypeParmDecl *Param |
| = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
| KeyLoc, Loc, Depth, Position, ParamName, |
| Typename, Ellipsis); |
| Param->setAccess(AS_public); |
| if (Invalid) |
| Param->setInvalidDecl(); |
| |
| if (ParamName) { |
| // Add the template parameter into the current scope. |
| S->AddDecl(Param); |
| IdResolver.AddDecl(Param); |
| } |
| |
| // C++0x [temp.param]p9: |
| // A default template-argument may be specified for any kind of |
| // template-parameter that is not a template parameter pack. |
| if (DefaultArg && Ellipsis) { |
| Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
| DefaultArg = ParsedType(); |
| } |
| |
| // Handle the default argument, if provided. |
| if (DefaultArg) { |
| TypeSourceInfo *DefaultTInfo; |
| GetTypeFromParser(DefaultArg, &DefaultTInfo); |
| |
| assert(DefaultTInfo && "expected source information for type"); |
| |
| // Check for unexpanded parameter packs. |
| if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo, |
| UPPC_DefaultArgument)) |
| return Param; |
| |
| // Check the template argument itself. |
| if (CheckTemplateArgument(Param, DefaultTInfo)) { |
| Param->setInvalidDecl(); |
| return Param; |
| } |
| |
| Param->setDefaultArgument(DefaultTInfo, false); |
| } |
| |
| return Param; |
| } |
| |
| /// \brief Check that the type of a non-type template parameter is |
| /// well-formed. |
| /// |
| /// \returns the (possibly-promoted) parameter type if valid; |
| /// otherwise, produces a diagnostic and returns a NULL type. |
| QualType |
| Sema::CheckNonTypeTemplateParameterType(QualType T, SourceLocation Loc) { |
| // We don't allow variably-modified types as the type of non-type template |
| // parameters. |
| if (T->isVariablyModifiedType()) { |
| Diag(Loc, diag::err_variably_modified_nontype_template_param) |
| << T; |
| return QualType(); |
| } |
| |
| // C++ [temp.param]p4: |
| // |
| // A non-type template-parameter shall have one of the following |
| // (optionally cv-qualified) types: |
| // |
| // -- integral or enumeration type, |
| if (T->isIntegralOrEnumerationType() || |
| // -- pointer to object or pointer to function, |
| T->isPointerType() || |
| // -- reference to object or reference to function, |
| T->isReferenceType() || |
| // -- pointer to member, |
| T->isMemberPointerType() || |
| // -- std::nullptr_t. |
| T->isNullPtrType() || |
| // If T is a dependent type, we can't do the check now, so we |
| // assume that it is well-formed. |
| T->isDependentType()) |
| return T; |
| // C++ [temp.param]p8: |
| // |
| // A non-type template-parameter of type "array of T" or |
| // "function returning T" is adjusted to be of type "pointer to |
| // T" or "pointer to function returning T", respectively. |
| else if (T->isArrayType()) |
| // FIXME: Keep the type prior to promotion? |
| return Context.getArrayDecayedType(T); |
| else if (T->isFunctionType()) |
| // FIXME: Keep the type prior to promotion? |
| return Context.getPointerType(T); |
| |
| Diag(Loc, diag::err_template_nontype_parm_bad_type) |
| << T; |
| |
| return QualType(); |
| } |
| |
| Decl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, |
| unsigned Depth, |
| unsigned Position, |
| SourceLocation EqualLoc, |
| Expr *Default) { |
| TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
| QualType T = TInfo->getType(); |
| |
| assert(S->isTemplateParamScope() && |
| "Non-type template parameter not in template parameter scope!"); |
| bool Invalid = false; |
| |
| IdentifierInfo *ParamName = D.getIdentifier(); |
| if (ParamName) { |
| NamedDecl *PrevDecl = LookupSingleName(S, ParamName, D.getIdentifierLoc(), |
| LookupOrdinaryName, |
| ForRedeclaration); |
| if (PrevDecl && PrevDecl->isTemplateParameter()) |
| Invalid = Invalid || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), |
| PrevDecl); |
| } |
| |
| T = CheckNonTypeTemplateParameterType(T, D.getIdentifierLoc()); |
| if (T.isNull()) { |
| T = Context.IntTy; // Recover with an 'int' type. |
| Invalid = true; |
| } |
| |
| bool IsParameterPack = D.hasEllipsis(); |
| NonTypeTemplateParmDecl *Param |
| = NonTypeTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
| D.getSourceRange().getBegin(), |
| D.getIdentifierLoc(), |
| Depth, Position, ParamName, T, |
| IsParameterPack, TInfo); |
| Param->setAccess(AS_public); |
| |
| if (Invalid) |
| Param->setInvalidDecl(); |
| |
| if (D.getIdentifier()) { |
| // Add the template parameter into the current scope. |
| S->AddDecl(Param); |
| IdResolver.AddDecl(Param); |
| } |
| |
| // C++0x [temp.param]p9: |
| // A default template-argument may be specified for any kind of |
| // template-parameter that is not a template parameter pack. |
| if (Default && IsParameterPack) { |
| Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
| Default = 0; |
| } |
| |
| // Check the well-formedness of the default template argument, if provided. |
| if (Default) { |
| // Check for unexpanded parameter packs. |
| if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument)) |
| return Param; |
| |
| TemplateArgument Converted; |
| ExprResult DefaultRes = CheckTemplateArgument(Param, Param->getType(), Default, Converted); |
| if (DefaultRes.isInvalid()) { |
| Param->setInvalidDecl(); |
| return Param; |
| } |
| Default = DefaultRes.take(); |
| |
| Param->setDefaultArgument(Default, false); |
| } |
| |
| return Param; |
| } |
| |
| /// ActOnTemplateTemplateParameter - Called when a C++ template template |
| /// parameter (e.g. T in template <template <typename> class T> class array) |
| /// has been parsed. S is the current scope. |
| Decl *Sema::ActOnTemplateTemplateParameter(Scope* S, |
| SourceLocation TmpLoc, |
| TemplateParamsTy *Params, |
| SourceLocation EllipsisLoc, |
| IdentifierInfo *Name, |
| SourceLocation NameLoc, |
| unsigned Depth, |
| unsigned Position, |
| SourceLocation EqualLoc, |
| ParsedTemplateArgument Default) { |
| assert(S->isTemplateParamScope() && |
| "Template template parameter not in template parameter scope!"); |
| |
| // Construct the parameter object. |
| bool IsParameterPack = EllipsisLoc.isValid(); |
| TemplateTemplateParmDecl *Param = |
| TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
| NameLoc.isInvalid()? TmpLoc : NameLoc, |
| Depth, Position, IsParameterPack, |
| Name, Params); |
| Param->setAccess(AS_public); |
| |
| // If the template template parameter has a name, then link the identifier |
| // into the scope and lookup mechanisms. |
| if (Name) { |
| S->AddDecl(Param); |
| IdResolver.AddDecl(Param); |
| } |
| |
| if (Params->size() == 0) { |
| Diag(Param->getLocation(), diag::err_template_template_parm_no_parms) |
| << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc()); |
| Param->setInvalidDecl(); |
| } |
| |
| // C++0x [temp.param]p9: |
| // A default template-argument may be specified for any kind of |
| // template-parameter that is not a template parameter pack. |
| if (IsParameterPack && !Default.isInvalid()) { |
| Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
| Default = ParsedTemplateArgument(); |
| } |
| |
| if (!Default.isInvalid()) { |
| // Check only that we have a template template argument. We don't want to |
| // try to check well-formedness now, because our template template parameter |
| // might have dependent types in its template parameters, which we wouldn't |
| // be able to match now. |
| // |
| // If none of the template template parameter's template arguments mention |
| // other template parameters, we could actually perform more checking here. |
| // However, it isn't worth doing. |
| TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default); |
| if (DefaultArg.getArgument().getAsTemplate().isNull()) { |
| Diag(DefaultArg.getLocation(), diag::err_template_arg_not_class_template) |
| << DefaultArg.getSourceRange(); |
| return Param; |
| } |
| |
| // Check for unexpanded parameter packs. |
| if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(), |
| DefaultArg.getArgument().getAsTemplate(), |
| UPPC_DefaultArgument)) |
| return Param; |
| |
| Param->setDefaultArgument(DefaultArg, false); |
| } |
| |
| return Param; |
| } |
| |
| /// ActOnTemplateParameterList - Builds a TemplateParameterList that |
| /// contains the template parameters in Params/NumParams. |
| Sema::TemplateParamsTy * |
| Sema::ActOnTemplateParameterList(unsigned Depth, |
| SourceLocation ExportLoc, |
| SourceLocation TemplateLoc, |
| SourceLocation LAngleLoc, |
| Decl **Params, unsigned NumParams, |
| SourceLocation RAngleLoc) { |
| if (ExportLoc.isValid()) |
| Diag(ExportLoc, diag::warn_template_export_unsupported); |
| |
| return TemplateParameterList::Create(Context, TemplateLoc, LAngleLoc, |
| (NamedDecl**)Params, NumParams, |
| RAngleLoc); |
| } |
| |
| static void SetNestedNameSpecifier(TagDecl *T, const CXXScopeSpec &SS) { |
| if (SS.isSet()) |
| T->setQualifierInfo(SS.getWithLocInContext(T->getASTContext())); |
| } |
| |
| DeclResult |
| Sema::CheckClassTemplate(Scope *S, unsigned TagSpec, TagUseKind TUK, |
| SourceLocation KWLoc, CXXScopeSpec &SS, |
| IdentifierInfo *Name, SourceLocation NameLoc, |
| AttributeList *Attr, |
| TemplateParameterList *TemplateParams, |
| AccessSpecifier AS, |
| unsigned NumOuterTemplateParamLists, |
| TemplateParameterList** OuterTemplateParamLists) { |
| assert(TemplateParams && TemplateParams->size() > 0 && |
| "No template parameters"); |
| assert(TUK != TUK_Reference && "Can only declare or define class templates"); |
| bool Invalid = false; |
| |
| // Check that we can declare a template here. |
| if (CheckTemplateDeclScope(S, TemplateParams)) |
| return true; |
| |
| TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| assert(Kind != TTK_Enum && "can't build template of enumerated type"); |
| |
| // There is no such thing as an unnamed class template. |
| if (!Name) { |
| Diag(KWLoc, diag::err_template_unnamed_class); |
| return true; |
| } |
| |
| // Find any previous declaration with this name. |
| DeclContext *SemanticContext; |
| LookupResult Previous(*this, Name, NameLoc, LookupOrdinaryName, |
| ForRedeclaration); |
| if (SS.isNotEmpty() && !SS.isInvalid()) { |
| SemanticContext = computeDeclContext(SS, true); |
| if (!SemanticContext) { |
| // FIXME: Produce a reasonable diagnostic here |
| return true; |
| } |
| |
| if (RequireCompleteDeclContext(SS, SemanticContext)) |
| return true; |
| |
| LookupQualifiedName(Previous, SemanticContext); |
| } else { |
| SemanticContext = CurContext; |
| LookupName(Previous, S); |
| } |
| |
| if (Previous.isAmbiguous()) |
| return true; |
| |
| NamedDecl *PrevDecl = 0; |
| if (Previous.begin() != Previous.end()) |
| PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
| |
| // If there is a previous declaration with the same name, check |
| // whether this is a valid redeclaration. |
| ClassTemplateDecl *PrevClassTemplate |
| = dyn_cast_or_null<ClassTemplateDecl>(PrevDecl); |
| |
| // We may have found the injected-class-name of a class template, |
| // class template partial specialization, or class template specialization. |
| // In these cases, grab the template that is being defined or specialized. |
| if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) && |
| cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) { |
| PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext()); |
| PrevClassTemplate |
| = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate(); |
| if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) { |
| PrevClassTemplate |
| = cast<ClassTemplateSpecializationDecl>(PrevDecl) |
| ->getSpecializedTemplate(); |
| } |
| } |
| |
| if (TUK == TUK_Friend) { |
| // C++ [namespace.memdef]p3: |
| // [...] When looking for a prior declaration of a class or a function |
| // declared as a friend, and when the name of the friend class or |
| // function is neither a qualified name nor a template-id, scopes outside |
| // the innermost enclosing namespace scope are not considered. |
| if (!SS.isSet()) { |
| DeclContext *OutermostContext = CurContext; |
| while (!OutermostContext->isFileContext()) |
| OutermostContext = OutermostContext->getLookupParent(); |
| |
| if (PrevDecl && |
| (OutermostContext->Equals(PrevDecl->getDeclContext()) || |
| OutermostContext->Encloses(PrevDecl->getDeclContext()))) { |
| SemanticContext = PrevDecl->getDeclContext(); |
| } else { |
| // Declarations in outer scopes don't matter. However, the outermost |
| // context we computed is the semantic context for our new |
| // declaration. |
| PrevDecl = PrevClassTemplate = 0; |
| SemanticContext = OutermostContext; |
| } |
| } |
| |
| if (CurContext->isDependentContext()) { |
| // If this is a dependent context, we don't want to link the friend |
| // class template to the template in scope, because that would perform |
| // checking of the template parameter lists that can't be performed |
| // until the outer context is instantiated. |
| PrevDecl = PrevClassTemplate = 0; |
| } |
| } else if (PrevDecl && !isDeclInScope(PrevDecl, SemanticContext, S)) |
| PrevDecl = PrevClassTemplate = 0; |
| |
| if (PrevClassTemplate) { |
| // Ensure that the template parameter lists are compatible. |
| if (!TemplateParameterListsAreEqual(TemplateParams, |
| PrevClassTemplate->getTemplateParameters(), |
| /*Complain=*/true, |
| TPL_TemplateMatch)) |
| return true; |
| |
| // C++ [temp.class]p4: |
| // In a redeclaration, partial specialization, explicit |
| // specialization or explicit instantiation of a class template, |
| // the class-key shall agree in kind with the original class |
| // template declaration (7.1.5.3). |
| RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl(); |
| if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind, KWLoc, *Name)) { |
| Diag(KWLoc, diag::err_use_with_wrong_tag) |
| << Name |
| << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName()); |
| Diag(PrevRecordDecl->getLocation(), diag::note_previous_use); |
| Kind = PrevRecordDecl->getTagKind(); |
| } |
| |
| // Check for redefinition of this class template. |
| if (TUK == TUK_Definition) { |
| if (TagDecl *Def = PrevRecordDecl->getDefinition()) { |
| Diag(NameLoc, diag::err_redefinition) << Name; |
| Diag(Def->getLocation(), diag::note_previous_definition); |
| // FIXME: Would it make sense to try to "forget" the previous |
| // definition, as part of error recovery? |
| return true; |
| } |
| } |
| } else if (PrevDecl && PrevDecl->isTemplateParameter()) { |
| // Maybe we will complain about the shadowed template parameter. |
| DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); |
| // Just pretend that we didn't see the previous declaration. |
| PrevDecl = 0; |
| } else if (PrevDecl) { |
| // C++ [temp]p5: |
| // A class template shall not have the same name as any other |
| // template, class, function, object, enumeration, enumerator, |
| // namespace, or type in the same scope (3.3), except as specified |
| // in (14.5.4). |
| Diag(NameLoc, diag::err_redefinition_different_kind) << Name; |
| Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
| return true; |
| } |
| |
| // Check the template parameter list of this declaration, possibly |
| // merging in the template parameter list from the previous class |
| // template declaration. |
| if (CheckTemplateParameterList(TemplateParams, |
| PrevClassTemplate? PrevClassTemplate->getTemplateParameters() : 0, |
| (SS.isSet() && SemanticContext && |
| SemanticContext->isRecord() && |
| SemanticContext->isDependentContext()) |
| ? TPC_ClassTemplateMember |
| : TPC_ClassTemplate)) |
| Invalid = true; |
| |
| if (SS.isSet()) { |
| // If the name of the template was qualified, we must be defining the |
| // template out-of-line. |
| if (!SS.isInvalid() && !Invalid && !PrevClassTemplate && |
| !(TUK == TUK_Friend && CurContext->isDependentContext())) |
| Diag(NameLoc, diag::err_member_def_does_not_match) |
| << Name << SemanticContext << SS.getRange(); |
| } |
| |
| CXXRecordDecl *NewClass = |
| CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name, |
| PrevClassTemplate? |
| PrevClassTemplate->getTemplatedDecl() : 0, |
| /*DelayTypeCreation=*/true); |
| SetNestedNameSpecifier(NewClass, SS); |
| if (NumOuterTemplateParamLists > 0) |
| NewClass->setTemplateParameterListsInfo(Context, |
| NumOuterTemplateParamLists, |
| OuterTemplateParamLists); |
| |
| ClassTemplateDecl *NewTemplate |
| = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc, |
| DeclarationName(Name), TemplateParams, |
| NewClass, PrevClassTemplate); |
| NewClass->setDescribedClassTemplate(NewTemplate); |
| |
| // Build the type for the class template declaration now. |
| QualType T = NewTemplate->getInjectedClassNameSpecialization(); |
| T = Context.getInjectedClassNameType(NewClass, T); |
| assert(T->isDependentType() && "Class template type is not dependent?"); |
| (void)T; |
| |
| // If we are providing an explicit specialization of a member that is a |
| // class template, make a note of that. |
| if (PrevClassTemplate && |
| PrevClassTemplate->getInstantiatedFromMemberTemplate()) |
| PrevClassTemplate->setMemberSpecialization(); |
| |
| // Set the access specifier. |
| if (!Invalid && TUK != TUK_Friend) |
| SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS); |
| |
| // Set the lexical context of these templates |
| NewClass->setLexicalDeclContext(CurContext); |
| NewTemplate->setLexicalDeclContext(CurContext); |
| |
| if (TUK == TUK_Definition) |
| NewClass->startDefinition(); |
| |
| if (Attr) |
| ProcessDeclAttributeList(S, NewClass, Attr); |
| |
| if (TUK != TUK_Friend) |
| PushOnScopeChains(NewTemplate, S); |
| else { |
| if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) { |
| NewTemplate->setAccess(PrevClassTemplate->getAccess()); |
| NewClass->setAccess(PrevClassTemplate->getAccess()); |
| } |
| |
| NewTemplate->setObjectOfFriendDecl(/* PreviouslyDeclared = */ |
| PrevClassTemplate != NULL); |
| |
| // Friend templates are visible in fairly strange ways. |
| if (!CurContext->isDependentContext()) { |
| DeclContext *DC = SemanticContext->getRedeclContext(); |
| DC->makeDeclVisibleInContext(NewTemplate, /* Recoverable = */ false); |
| if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) |
| PushOnScopeChains(NewTemplate, EnclosingScope, |
| /* AddToContext = */ false); |
| } |
| |
| FriendDecl *Friend = FriendDecl::Create(Context, CurContext, |
| NewClass->getLocation(), |
| NewTemplate, |
| /*FIXME:*/NewClass->getLocation()); |
| Friend->setAccess(AS_public); |
| CurContext->addDecl(Friend); |
| } |
| |
| if (Invalid) { |
| NewTemplate->setInvalidDecl(); |
| NewClass->setInvalidDecl(); |
| } |
| return NewTemplate; |
| } |
| |
| /// \brief Diagnose the presence of a default template argument on a |
| /// template parameter, which is ill-formed in certain contexts. |
| /// |
| /// \returns true if the default template argument should be dropped. |
| static bool DiagnoseDefaultTemplateArgument(Sema &S, |
| Sema::TemplateParamListContext TPC, |
| SourceLocation ParamLoc, |
| SourceRange DefArgRange) { |
| switch (TPC) { |
| case Sema::TPC_ClassTemplate: |
| case Sema::TPC_TypeAliasTemplate: |
| return false; |
| |
| case Sema::TPC_FunctionTemplate: |
| case Sema::TPC_FriendFunctionTemplateDefinition: |
| // C++ [temp.param]p9: |
| // A default template-argument shall not be specified in a |
| // function template declaration or a function template |
| // definition [...] |
| // If a friend function template declaration specifies a default |
| // template-argument, that declaration shall be a definition and shall be |
| // the only declaration of the function template in the translation unit. |
| // (C++98/03 doesn't have this wording; see DR226). |
| if (!S.getLangOptions().CPlusPlus0x) |
| S.Diag(ParamLoc, |
| diag::ext_template_parameter_default_in_function_template) |
| << DefArgRange; |
| return false; |
| |
| case Sema::TPC_ClassTemplateMember: |
| // C++0x [temp.param]p9: |
| // A default template-argument shall not be specified in the |
| // template-parameter-lists of the definition of a member of a |
| // class template that appears outside of the member's class. |
| S.Diag(ParamLoc, diag::err_template_parameter_default_template_member) |
| << DefArgRange; |
| return true; |
| |
| case Sema::TPC_FriendFunctionTemplate: |
| // C++ [temp.param]p9: |
| // A default template-argument shall not be specified in a |
| // friend template declaration. |
| S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template) |
| << DefArgRange; |
| return true; |
| |
| // FIXME: C++0x [temp.param]p9 allows default template-arguments |
| // for friend function templates if there is only a single |
| // declaration (and it is a definition). Strange! |
| } |
| |
| return false; |
| } |
| |
| /// \brief Check for unexpanded parameter packs within the template parameters |
| /// of a template template parameter, recursively. |
| static bool DiagnoseUnexpandedParameterPacks(Sema &S, |
| TemplateTemplateParmDecl *TTP) { |
| TemplateParameterList *Params = TTP->getTemplateParameters(); |
| for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
| NamedDecl *P = Params->getParam(I); |
| if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) { |
| if (S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(), |
| NTTP->getTypeSourceInfo(), |
| Sema::UPPC_NonTypeTemplateParameterType)) |
| return true; |
| |
| continue; |
| } |
| |
| if (TemplateTemplateParmDecl *InnerTTP |
| = dyn_cast<TemplateTemplateParmDecl>(P)) |
| if (DiagnoseUnexpandedParameterPacks(S, InnerTTP)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /// \brief Checks the validity of a template parameter list, possibly |
| /// considering the template parameter list from a previous |
| /// declaration. |
| /// |
| /// If an "old" template parameter list is provided, it must be |
| /// equivalent (per TemplateParameterListsAreEqual) to the "new" |
| /// template parameter list. |
| /// |
| /// \param NewParams Template parameter list for a new template |
| /// declaration. This template parameter list will be updated with any |
| /// default arguments that are carried through from the previous |
| /// template parameter list. |
| /// |
| /// \param OldParams If provided, template parameter list from a |
| /// previous declaration of the same template. Default template |
| /// arguments will be merged from the old template parameter list to |
| /// the new template parameter list. |
| /// |
| /// \param TPC Describes the context in which we are checking the given |
| /// template parameter list. |
| /// |
| /// \returns true if an error occurred, false otherwise. |
| bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams, |
| TemplateParameterList *OldParams, |
| TemplateParamListContext TPC) { |
| bool Invalid = false; |
| |
| // C++ [temp.param]p10: |
| // The set of default template-arguments available for use with a |
| // template declaration or definition is obtained by merging the |
| // default arguments from the definition (if in scope) and all |
| // declarations in scope in the same way default function |
| // arguments are (8.3.6). |
| bool SawDefaultArgument = false; |
| SourceLocation PreviousDefaultArgLoc; |
| |
| bool SawParameterPack = false; |
| SourceLocation ParameterPackLoc; |
| |
| // Dummy initialization to avoid warnings. |
| TemplateParameterList::iterator OldParam = NewParams->end(); |
| if (OldParams) |
| OldParam = OldParams->begin(); |
| |
| bool RemoveDefaultArguments = false; |
| for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
| NewParamEnd = NewParams->end(); |
| NewParam != NewParamEnd; ++NewParam) { |
| // Variables used to diagnose redundant default arguments |
| bool RedundantDefaultArg = false; |
| SourceLocation OldDefaultLoc; |
| SourceLocation NewDefaultLoc; |
| |
| // Variables used to diagnose missing default arguments |
| bool MissingDefaultArg = false; |
| |
| // C++0x [temp.param]p11: |
| // If a template parameter of a primary class template or alias template |
| // is a template parameter pack, it shall be the last template parameter. |
| if (SawParameterPack && |
| (TPC == TPC_ClassTemplate || TPC == TPC_TypeAliasTemplate)) { |
| Diag(ParameterPackLoc, |
| diag::err_template_param_pack_must_be_last_template_parameter); |
| Invalid = true; |
| } |
| |
| if (TemplateTypeParmDecl *NewTypeParm |
| = dyn_cast<TemplateTypeParmDecl>(*NewParam)) { |
| // Check the presence of a default argument here. |
| if (NewTypeParm->hasDefaultArgument() && |
| DiagnoseDefaultTemplateArgument(*this, TPC, |
| NewTypeParm->getLocation(), |
| NewTypeParm->getDefaultArgumentInfo()->getTypeLoc() |
| .getSourceRange())) |
| NewTypeParm->removeDefaultArgument(); |
| |
| // Merge default arguments for template type parameters. |
| TemplateTypeParmDecl *OldTypeParm |
| = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : 0; |
| |
| if (NewTypeParm->isParameterPack()) { |
| assert(!NewTypeParm->hasDefaultArgument() && |
| "Parameter packs can't have a default argument!"); |
| SawParameterPack = true; |
| ParameterPackLoc = NewTypeParm->getLocation(); |
| } else if (OldTypeParm && OldTypeParm->hasDefaultArgument() && |
| NewTypeParm->hasDefaultArgument()) { |
| OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc(); |
| NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc(); |
| SawDefaultArgument = true; |
| RedundantDefaultArg = true; |
| PreviousDefaultArgLoc = NewDefaultLoc; |
| } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) { |
| // Merge the default argument from the old declaration to the |
| // new declaration. |
| SawDefaultArgument = true; |
| NewTypeParm->setDefaultArgument(OldTypeParm->getDefaultArgumentInfo(), |
| true); |
| PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc(); |
| } else if (NewTypeParm->hasDefaultArgument()) { |
| SawDefaultArgument = true; |
| PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc(); |
| } else if (SawDefaultArgument) |
| MissingDefaultArg = true; |
| } else if (NonTypeTemplateParmDecl *NewNonTypeParm |
| = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) { |
| // Check for unexpanded parameter packs. |
| if (DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(), |
| NewNonTypeParm->getTypeSourceInfo(), |
| UPPC_NonTypeTemplateParameterType)) { |
| Invalid = true; |
| continue; |
| } |
| |
| // Check the presence of a default argument here. |
| if (NewNonTypeParm->hasDefaultArgument() && |
| DiagnoseDefaultTemplateArgument(*this, TPC, |
| NewNonTypeParm->getLocation(), |
| NewNonTypeParm->getDefaultArgument()->getSourceRange())) { |
| NewNonTypeParm->removeDefaultArgument(); |
| } |
| |
| // Merge default arguments for non-type template parameters |
| NonTypeTemplateParmDecl *OldNonTypeParm |
| = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : 0; |
| if (NewNonTypeParm->isParameterPack()) { |
| assert(!NewNonTypeParm->hasDefaultArgument() && |
| "Parameter packs can't have a default argument!"); |
| SawParameterPack = true; |
| ParameterPackLoc = NewNonTypeParm->getLocation(); |
| } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument() && |
| NewNonTypeParm->hasDefaultArgument()) { |
| OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
| NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
| SawDefaultArgument = true; |
| RedundantDefaultArg = true; |
| PreviousDefaultArgLoc = NewDefaultLoc; |
| } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) { |
| // Merge the default argument from the old declaration to the |
| // new declaration. |
| SawDefaultArgument = true; |
| // FIXME: We need to create a new kind of "default argument" |
| // expression that points to a previous non-type template |
| // parameter. |
| NewNonTypeParm->setDefaultArgument( |
| OldNonTypeParm->getDefaultArgument(), |
| /*Inherited=*/ true); |
| PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
| } else if (NewNonTypeParm->hasDefaultArgument()) { |
| SawDefaultArgument = true; |
| PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
| } else if (SawDefaultArgument) |
| MissingDefaultArg = true; |
| } else { |
| // Check the presence of a default argument here. |
| TemplateTemplateParmDecl *NewTemplateParm |
| = cast<TemplateTemplateParmDecl>(*NewParam); |
| |
| // Check for unexpanded parameter packs, recursively. |
| if (DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) { |
| Invalid = true; |
| continue; |
| } |
| |
| if (NewTemplateParm->hasDefaultArgument() && |
| DiagnoseDefaultTemplateArgument(*this, TPC, |
| NewTemplateParm->getLocation(), |
| NewTemplateParm->getDefaultArgument().getSourceRange())) |
| NewTemplateParm->removeDefaultArgument(); |
| |
| // Merge default arguments for template template parameters |
| TemplateTemplateParmDecl *OldTemplateParm |
| = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : 0; |
| if (NewTemplateParm->isParameterPack()) { |
| assert(!NewTemplateParm->hasDefaultArgument() && |
| "Parameter packs can't have a default argument!"); |
| SawParameterPack = true; |
| ParameterPackLoc = NewTemplateParm->getLocation(); |
| } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument() && |
| NewTemplateParm->hasDefaultArgument()) { |
| OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation(); |
| NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation(); |
| SawDefaultArgument = true; |
| RedundantDefaultArg = true; |
| PreviousDefaultArgLoc = NewDefaultLoc; |
| } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) { |
| // Merge the default argument from the old declaration to the |
| // new declaration. |
| SawDefaultArgument = true; |
| // FIXME: We need to create a new kind of "default argument" expression |
| // that points to a previous template template parameter. |
| NewTemplateParm->setDefaultArgument( |
| OldTemplateParm->getDefaultArgument(), |
| /*Inherited=*/ true); |
| PreviousDefaultArgLoc |
| = OldTemplateParm->getDefaultArgument().getLocation(); |
| } else if (NewTemplateParm->hasDefaultArgument()) { |
| SawDefaultArgument = true; |
| PreviousDefaultArgLoc |
| = NewTemplateParm->getDefaultArgument().getLocation(); |
| } else if (SawDefaultArgument) |
| MissingDefaultArg = true; |
| } |
| |
| if (RedundantDefaultArg) { |
| // C++ [temp.param]p12: |
| // A template-parameter shall not be given default arguments |
| // by two different declarations in the same scope. |
| Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition); |
| Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg); |
| Invalid = true; |
| } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) { |
| // C++ [temp.param]p11: |
| // If a template-parameter of a class template has a default |
| // template-argument, each subsequent template-parameter shall either |
| // have a default template-argument supplied or be a template parameter |
| // pack. |
| Diag((*NewParam)->getLocation(), |
| diag::err_template_param_default_arg_missing); |
| Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg); |
| Invalid = true; |
| RemoveDefaultArguments = true; |
| } |
| |
| // If we have an old template parameter list that we're merging |
| // in, move on to the next parameter. |
| if (OldParams) |
| ++OldParam; |
| } |
| |
| // We were missing some default arguments at the end of the list, so remove |
| // all of the default arguments. |
| if (RemoveDefaultArguments) { |
| for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
| NewParamEnd = NewParams->end(); |
| NewParam != NewParamEnd; ++NewParam) { |
| if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam)) |
| TTP->removeDefaultArgument(); |
| else if (NonTypeTemplateParmDecl *NTTP |
| = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) |
| NTTP->removeDefaultArgument(); |
| else |
| cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument(); |
| } |
| } |
| |
| return Invalid; |
| } |
| |
| namespace { |
| |
| /// A class which looks for a use of a certain level of template |
| /// parameter. |
| struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> { |
| typedef RecursiveASTVisitor<DependencyChecker> super; |
| |
| unsigned Depth; |
| bool Match; |
| |
| DependencyChecker(TemplateParameterList *Params) : Match(false) { |
| NamedDecl *ND = Params->getParam(0); |
| if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) { |
| Depth = PD->getDepth(); |
| } else if (NonTypeTemplateParmDecl *PD = |
| dyn_cast<NonTypeTemplateParmDecl>(ND)) { |
| Depth = PD->getDepth(); |
| } else { |
| Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth(); |
| } |
| } |
| |
| bool Matches(unsigned ParmDepth) { |
| if (ParmDepth >= Depth) { |
| Match = true; |
| return true; |
| } |
| return false; |
| } |
| |
| bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) { |
| return !Matches(T->getDepth()); |
| } |
| |
| bool TraverseTemplateName(TemplateName N) { |
| if (TemplateTemplateParmDecl *PD = |
| dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl())) |
| if (Matches(PD->getDepth())) return false; |
| return super::TraverseTemplateName(N); |
| } |
| |
| bool VisitDeclRefExpr(DeclRefExpr *E) { |
| if (NonTypeTemplateParmDecl *PD = |
| dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) { |
| if (PD->getDepth() == Depth) { |
| Match = true; |
| return false; |
| } |
| } |
| return super::VisitDeclRefExpr(E); |
| } |
| |
| bool TraverseInjectedClassNameType(const InjectedClassNameType *T) { |
| return TraverseType(T->getInjectedSpecializationType()); |
| } |
| }; |
| } |
| |
| /// Determines whether a given type depends on the given parameter |
| /// list. |
| static bool |
| DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) { |
| DependencyChecker Checker(Params); |
| Checker.TraverseType(T); |
| return Checker.Match; |
| } |
| |
| // Find the source range corresponding to the named type in the given |
| // nested-name-specifier, if any. |
| static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context, |
| QualType T, |
| const CXXScopeSpec &SS) { |
| NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data()); |
| while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) { |
| if (const Type *CurType = NNS->getAsType()) { |
| if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0))) |
| return NNSLoc.getTypeLoc().getSourceRange(); |
| } else |
| break; |
| |
| NNSLoc = NNSLoc.getPrefix(); |
| } |
| |
| return SourceRange(); |
| } |
| |
| /// \brief Match the given template parameter lists to the given scope |
| /// specifier, returning the template parameter list that applies to the |
| /// name. |
| /// |
| /// \param DeclStartLoc the start of the declaration that has a scope |
| /// specifier or a template parameter list. |
| /// |
| /// \param DeclLoc The location of the declaration itself. |
| /// |
| /// \param SS the scope specifier that will be matched to the given template |
| /// parameter lists. This scope specifier precedes a qualified name that is |
| /// being declared. |
| /// |
| /// \param ParamLists the template parameter lists, from the outermost to the |
| /// innermost template parameter lists. |
| /// |
| /// \param NumParamLists the number of template parameter lists in ParamLists. |
| /// |
| /// \param IsFriend Whether to apply the slightly different rules for |
| /// matching template parameters to scope specifiers in friend |
| /// declarations. |
| /// |
| /// \param IsExplicitSpecialization will be set true if the entity being |
| /// declared is an explicit specialization, false otherwise. |
| /// |
| /// \returns the template parameter list, if any, that corresponds to the |
| /// name that is preceded by the scope specifier @p SS. This template |
| /// parameter list may have template parameters (if we're declaring a |
| /// template) or may have no template parameters (if we're declaring a |
| /// template specialization), or may be NULL (if what we're declaring isn't |
| /// itself a template). |
| TemplateParameterList * |
| Sema::MatchTemplateParametersToScopeSpecifier(SourceLocation DeclStartLoc, |
| SourceLocation DeclLoc, |
| const CXXScopeSpec &SS, |
| TemplateParameterList **ParamLists, |
| unsigned NumParamLists, |
| bool IsFriend, |
| bool &IsExplicitSpecialization, |
| bool &Invalid) { |
| IsExplicitSpecialization = false; |
| Invalid = false; |
| |
| // The sequence of nested types to which we will match up the template |
| // parameter lists. We first build this list by starting with the type named |
| // by the nested-name-specifier and walking out until we run out of types. |
| llvm::SmallVector<QualType, 4> NestedTypes; |
| QualType T; |
| if (SS.getScopeRep()) { |
| if (CXXRecordDecl *Record |
| = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true))) |
| T = Context.getTypeDeclType(Record); |
| else |
| T = QualType(SS.getScopeRep()->getAsType(), 0); |
| } |
| |
| // If we found an explicit specialization that prevents us from needing |
| // 'template<>' headers, this will be set to the location of that |
| // explicit specialization. |
| SourceLocation ExplicitSpecLoc; |
| |
| while (!T.isNull()) { |
| NestedTypes.push_back(T); |
| |
| // Retrieve the parent of a record type. |
| if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
| // If this type is an explicit specialization, we're done. |
| if (ClassTemplateSpecializationDecl *Spec |
| = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
| if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) && |
| Spec->getSpecializationKind() == TSK_ExplicitSpecialization) { |
| ExplicitSpecLoc = Spec->getLocation(); |
| break; |
| } |
| } else if (Record->getTemplateSpecializationKind() |
| == TSK_ExplicitSpecialization) { |
| ExplicitSpecLoc = Record->getLocation(); |
| break; |
| } |
| |
| if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent())) |
| T = Context.getTypeDeclType(Parent); |
| else |
| T = QualType(); |
| continue; |
| } |
| |
| if (const TemplateSpecializationType *TST |
| = T->getAs<TemplateSpecializationType>()) { |
| if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
| if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext())) |
| T = Context.getTypeDeclType(Parent); |
| else |
| T = QualType(); |
| continue; |
| } |
| } |
| |
| // Look one step prior in a dependent template specialization type. |
| if (const DependentTemplateSpecializationType *DependentTST |
| = T->getAs<DependentTemplateSpecializationType>()) { |
| if (NestedNameSpecifier *NNS = DependentTST->getQualifier()) |
| T = QualType(NNS->getAsType(), 0); |
| else |
| T = QualType(); |
| continue; |
| } |
| |
| // Look one step prior in a dependent name type. |
| if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){ |
| if (NestedNameSpecifier *NNS = DependentName->getQualifier()) |
| T = QualType(NNS->getAsType(), 0); |
| else |
| T = QualType(); |
| continue; |
| } |
| |
| // Retrieve the parent of an enumeration type. |
| if (const EnumType *EnumT = T->getAs<EnumType>()) { |
| // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization |
| // check here. |
| EnumDecl *Enum = EnumT->getDecl(); |
| |
| // Get to the parent type. |
| if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent())) |
| T = Context.getTypeDeclType(Parent); |
| else |
| T = QualType(); |
| continue; |
| } |
| |
| T = QualType(); |
| } |
| // Reverse the nested types list, since we want to traverse from the outermost |
| // to the innermost while checking template-parameter-lists. |
| std::reverse(NestedTypes.begin(), NestedTypes.end()); |
| |
| // C++0x [temp.expl.spec]p17: |
| // A member or a member template may be nested within many |
| // enclosing class templates. In an explicit specialization for |
| // such a member, the member declaration shall be preceded by a |
| // template<> for each enclosing class template that is |
| // explicitly specialized. |
| unsigned ParamIdx = 0; |
| for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes; |
| ++TypeIdx) { |
| T = NestedTypes[TypeIdx]; |
| |
| // Whether we expect a 'template<>' header. |
| bool NeedEmptyTemplateHeader = false; |
| |
| // Whether we expect a template header with parameters. |
| bool NeedNonemptyTemplateHeader = false; |
| |
| // For a dependent type, the set of template parameters that we |
| // expect to see. |
| TemplateParameterList *ExpectedTemplateParams = 0; |
| |
| // C++0x [temp.expl.spec]p15: |
| // A member or a member template may be nested within many enclosing |
| // class templates. In an explicit specialization for such a member, the |
| // member declaration shall be preceded by a template<> for each |
| // enclosing class template that is explicitly specialized. |
| if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
| if (ClassTemplatePartialSpecializationDecl *Partial |
| = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { |
| ExpectedTemplateParams = Partial->getTemplateParameters(); |
| NeedNonemptyTemplateHeader = true; |
| } else if (Record->isDependentType()) { |
| if (Record->getDescribedClassTemplate()) { |
| ExpectedTemplateParams = Record->getDescribedClassTemplate() |
| ->getTemplateParameters(); |
| NeedNonemptyTemplateHeader = true; |
| } |
| } else if (ClassTemplateSpecializationDecl *Spec |
| = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
| // C++0x [temp.expl.spec]p4: |
| // Members of an explicitly specialized class template are defined |
| // in the same manner as members of normal classes, and not using |
| // the template<> syntax. |
| if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization) |
| NeedEmptyTemplateHeader = true; |
| else |
| break; |
| } else if (Record->getTemplateSpecializationKind()) { |
| if (Record->getTemplateSpecializationKind() |
| != TSK_ExplicitSpecialization && |
| TypeIdx == NumTypes - 1) |
| IsExplicitSpecialization = true; |
| |
| continue; |
| } |
| } else if (const TemplateSpecializationType *TST |
| = T->getAs<TemplateSpecializationType>()) { |
| if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
| ExpectedTemplateParams = Template->getTemplateParameters(); |
| NeedNonemptyTemplateHeader = true; |
| } |
| } else if (T->getAs<DependentTemplateSpecializationType>()) { |
| // FIXME: We actually could/should check the template arguments here |
| // against the corresponding template parameter list. |
| NeedNonemptyTemplateHeader = false; |
| } |
| |
| if (NeedEmptyTemplateHeader) { |
| // If we're on the last of the types, and we need a 'template<>' header |
| // here, then it's an explicit specialization. |
| if (TypeIdx == NumTypes - 1) |
| IsExplicitSpecialization = true; |
| |
| if (ParamIdx < NumParamLists) { |
| if (ParamLists[ParamIdx]->size() > 0) { |
| // The header has template parameters when it shouldn't. Complain. |
| Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
| diag::err_template_param_list_matches_nontemplate) |
| << T |
| << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(), |
| ParamLists[ParamIdx]->getRAngleLoc()) |
| << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
| Invalid = true; |
| return 0; |
| } |
| |
| // Consume this template header. |
| ++ParamIdx; |
| continue; |
| } |
| |
| if (!IsFriend) { |
| // We don't have a template header, but we should. |
| SourceLocation ExpectedTemplateLoc; |
| if (NumParamLists > 0) |
| ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc(); |
| else |
| ExpectedTemplateLoc = DeclStartLoc; |
| |
| Diag(DeclLoc, diag::err_template_spec_needs_header) |
| << getRangeOfTypeInNestedNameSpecifier(Context, T, SS) |
| << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> "); |
| } |
| |
| continue; |
| } |
| |
| if (NeedNonemptyTemplateHeader) { |
| // In friend declarations we can have template-ids which don't |
| // depend on the corresponding template parameter lists. But |
| // assume that empty parameter lists are supposed to match this |
| // template-id. |
| if (IsFriend && T->isDependentType()) { |
| if (ParamIdx < NumParamLists && |
| DependsOnTemplateParameters(T, ParamLists[ParamIdx])) |
| ExpectedTemplateParams = 0; |
| else |
| continue; |
| } |
| |
| if (ParamIdx < NumParamLists) { |
| // Check the template parameter list, if we can. |
| if (ExpectedTemplateParams && |
| !TemplateParameterListsAreEqual(ParamLists[ParamIdx], |
| ExpectedTemplateParams, |
| true, TPL_TemplateMatch)) |
| Invalid = true; |
| |
| if (!Invalid && |
| CheckTemplateParameterList(ParamLists[ParamIdx], 0, |
| TPC_ClassTemplateMember)) |
| Invalid = true; |
| |
| ++ParamIdx; |
| continue; |
| } |
| |
| Diag(DeclLoc, diag::err_template_spec_needs_template_parameters) |
| << T |
| << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
| Invalid = true; |
| continue; |
| } |
| } |
| |
| // If there were at least as many template-ids as there were template |
| // parameter lists, then there are no template parameter lists remaining for |
| // the declaration itself. |
| if (ParamIdx >= NumParamLists) |
| return 0; |
| |
| // If there were too many template parameter lists, complain about that now. |
| if (ParamIdx < NumParamLists - 1) { |
| bool HasAnyExplicitSpecHeader = false; |
| bool AllExplicitSpecHeaders = true; |
| for (unsigned I = ParamIdx; I != NumParamLists - 1; ++I) { |
| if (ParamLists[I]->size() == 0) |
| HasAnyExplicitSpecHeader = true; |
| else |
| AllExplicitSpecHeaders = false; |
| } |
| |
| Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
| AllExplicitSpecHeaders? diag::warn_template_spec_extra_headers |
| : diag::err_template_spec_extra_headers) |
| << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(), |
| ParamLists[NumParamLists - 2]->getRAngleLoc()); |
| |
| // If there was a specialization somewhere, such that 'template<>' is |
| // not required, and there were any 'template<>' headers, note where the |
| // specialization occurred. |
| if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader) |
| Diag(ExplicitSpecLoc, |
| diag::note_explicit_template_spec_does_not_need_header) |
| << NestedTypes.back(); |
| |
| // We have a template parameter list with no corresponding scope, which |
| // means that the resulting template declaration can't be instantiated |
| // properly (we'll end up with dependent nodes when we shouldn't). |
| if (!AllExplicitSpecHeaders) |
| Invalid = true; |
| } |
| |
| // Return the last template parameter list, which corresponds to the |
| // entity being declared. |
| return ParamLists[NumParamLists - 1]; |
| } |
| |
| void Sema::NoteAllFoundTemplates(TemplateName Name) { |
| if (TemplateDecl *Template = Name.getAsTemplateDecl()) { |
| Diag(Template->getLocation(), diag::note_template_declared_here) |
| << (isa<FunctionTemplateDecl>(Template)? 0 |
| : isa<ClassTemplateDecl>(Template)? 1 |
| : isa<TypeAliasTemplateDecl>(Template)? 2 |
| : 3) |
| << Template->getDeclName(); |
| return; |
| } |
| |
| if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) { |
| for (OverloadedTemplateStorage::iterator I = OST->begin(), |
| IEnd = OST->end(); |
| I != IEnd; ++I) |
| Diag((*I)->getLocation(), diag::note_template_declared_here) |
| << 0 << (*I)->getDeclName(); |
| |
| return; |
| } |
| } |
| |
| |
| QualType Sema::CheckTemplateIdType(TemplateName Name, |
| SourceLocation TemplateLoc, |
| TemplateArgumentListInfo &TemplateArgs) { |
| DependentTemplateName *DTN = Name.getAsDependentTemplateName(); |
| if (DTN && DTN->isIdentifier()) |
| // When building a template-id where the template-name is dependent, |
| // assume the template is a type template. Either our assumption is |
| // correct, or the code is ill-formed and will be diagnosed when the |
| // dependent name is substituted. |
| return Context.getDependentTemplateSpecializationType(ETK_None, |
| DTN->getQualifier(), |
| DTN->getIdentifier(), |
| TemplateArgs); |
| |
| TemplateDecl *Template = Name.getAsTemplateDecl(); |
| if (!Template || isa<FunctionTemplateDecl>(Template)) { |
| // We might have a substituted template template parameter pack. If so, |
| // build a template specialization type for it. |
| if (Name.getAsSubstTemplateTemplateParmPack()) |
| return Context.getTemplateSpecializationType(Name, TemplateArgs); |
| |
| Diag(TemplateLoc, diag::err_template_id_not_a_type) |
| << Name; |
| NoteAllFoundTemplates(Name); |
| return QualType(); |
| } |
| |
| // Check that the template argument list is well-formed for this |
| // template. |
| llvm::SmallVector<TemplateArgument, 4> Converted; |
| if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs, |
| false, Converted)) |
| return QualType(); |
| |
| assert((Converted.size() == Template->getTemplateParameters()->size()) && |
| "Converted template argument list is too short!"); |
| |
| QualType CanonType; |
| |
| if (TypeAliasTemplateDecl *AliasTemplate |
| = dyn_cast<TypeAliasTemplateDecl>(Template)) { |
| // Find the canonical type for this type alias template specialization. |
| TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl(); |
| if (Pattern->isInvalidDecl()) |
| return QualType(); |
| |
| TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
| Converted.data(), Converted.size()); |
| |
| // Only substitute for the innermost template argument list. |
| MultiLevelTemplateArgumentList TemplateArgLists; |
| TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); |
| unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth(); |
| for (unsigned I = 0; I < Depth; ++I) |
| TemplateArgLists.addOuterTemplateArguments(0, 0); |
| |
| InstantiatingTemplate Inst(*this, TemplateLoc, Template); |
| CanonType = SubstType(Pattern->getUnderlyingType(), |
| TemplateArgLists, AliasTemplate->getLocation(), |
| AliasTemplate->getDeclName()); |
| if (CanonType.isNull()) |
| return QualType(); |
| } else if (Name.isDependent() || |
| TemplateSpecializationType::anyDependentTemplateArguments( |
| TemplateArgs)) { |
| // This class template specialization is a dependent |
| // type. Therefore, its canonical type is another class template |
| // specialization type that contains all of the converted |
| // arguments in canonical form. This ensures that, e.g., A<T> and |
| // A<T, T> have identical types when A is declared as: |
| // |
| // template<typename T, typename U = T> struct A; |
| TemplateName CanonName = Context.getCanonicalTemplateName(Name); |
| CanonType = Context.getTemplateSpecializationType(CanonName, |
| Converted.data(), |
| Converted.size()); |
| |
| // FIXME: CanonType is not actually the canonical type, and unfortunately |
| // it is a TemplateSpecializationType that we will never use again. |
| // In the future, we need to teach getTemplateSpecializationType to only |
| // build the canonical type and return that to us. |
| CanonType = Context.getCanonicalType(CanonType); |
| |
| // This might work out to be a current instantiation, in which |
| // case the canonical type needs to be the InjectedClassNameType. |
| // |
| // TODO: in theory this could be a simple hashtable lookup; most |
| // changes to CurContext don't change the set of current |
| // instantiations. |
| if (isa<ClassTemplateDecl>(Template)) { |
| for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) { |
| // If we get out to a namespace, we're done. |
| if (Ctx->isFileContext()) break; |
| |
| // If this isn't a record, keep looking. |
| CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx); |
| if (!Record) continue; |
| |
| // Look for one of the two cases with InjectedClassNameTypes |
| // and check whether it's the same template. |
| if (!isa<ClassTemplatePartialSpecializationDecl>(Record) && |
| !Record->getDescribedClassTemplate()) |
| continue; |
| |
| // Fetch the injected class name type and check whether its |
| // injected type is equal to the type we just built. |
| QualType ICNT = Context.getTypeDeclType(Record); |
| QualType Injected = cast<InjectedClassNameType>(ICNT) |
| ->getInjectedSpecializationType(); |
| |
| if (CanonType != Injected->getCanonicalTypeInternal()) |
| continue; |
| |
| // If so, the canonical type of this TST is the injected |
| // class name type of the record we just found. |
| assert(ICNT.isCanonical()); |
| CanonType = ICNT; |
| break; |
| } |
| } |
| } else if (ClassTemplateDecl *ClassTemplate |
| = dyn_cast<ClassTemplateDecl>(Template)) { |
| // Find the class template specialization declaration that |
| // corresponds to these arguments. |
| void *InsertPos = 0; |
| ClassTemplateSpecializationDecl *Decl |
| = ClassTemplate->findSpecialization(Converted.data(), Converted.size(), |
| InsertPos); |
| if (!Decl) { |
| // This is the first time we have referenced this class template |
| // specialization. Create the canonical declaration and add it to |
| // the set of specializations. |
| Decl = ClassTemplateSpecializationDecl::Create(Context, |
| ClassTemplate->getTemplatedDecl()->getTagKind(), |
| ClassTemplate->getDeclContext(), |
| ClassTemplate->getLocation(), |
| ClassTemplate->getLocation(), |
| ClassTemplate, |
| Converted.data(), |
| Converted.size(), 0); |
| ClassTemplate->AddSpecialization(Decl, InsertPos); |
| Decl->setLexicalDeclContext(CurContext); |
| } |
| |
| CanonType = Context.getTypeDeclType(Decl); |
| assert(isa<RecordType>(CanonType) && |
| "type of non-dependent specialization is not a RecordType"); |
| } |
| |
| // Build the fully-sugared type for this class template |
| // specialization, which refers back to the class template |
| // specialization we created or found. |
| return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType); |
| } |
| |
| TypeResult |
| Sema::ActOnTemplateIdType(CXXScopeSpec &SS, |
| TemplateTy TemplateD, SourceLocation TemplateLoc, |
| SourceLocation LAngleLoc, |
| ASTTemplateArgsPtr TemplateArgsIn, |
| SourceLocation RAngleLoc) { |
| if (SS.isInvalid()) |
| return true; |
| |
| TemplateName Template = TemplateD.getAsVal<TemplateName>(); |
| |
| // Translate the parser's template argument list in our AST format. |
| TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| |
| if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
| QualType T = Context.getDependentTemplateSpecializationType(ETK_None, |
| DTN->getQualifier(), |
| DTN->getIdentifier(), |
| TemplateArgs); |
| |
| // Build type-source information. |
| TypeLocBuilder TLB; |
| DependentTemplateSpecializationTypeLoc SpecTL |
| = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
| SpecTL.setKeywordLoc(SourceLocation()); |
| SpecTL.setNameLoc(TemplateLoc); |
| SpecTL.setLAngleLoc(LAngleLoc); |
| SpecTL.setRAngleLoc(RAngleLoc); |
| SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
| SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
| } |
| |
| QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs); |
| TemplateArgsIn.release(); |
| |
| if (Result.isNull()) |
| return true; |
| |
| // Build type-source information. |
| TypeLocBuilder TLB; |
| TemplateSpecializationTypeLoc SpecTL |
| = TLB.push<TemplateSpecializationTypeLoc>(Result); |
| SpecTL.setTemplateNameLoc(TemplateLoc); |
| SpecTL.setLAngleLoc(LAngleLoc); |
| SpecTL.setRAngleLoc(RAngleLoc); |
| for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
| SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
| |
| if (SS.isNotEmpty()) { |
| // Create an elaborated-type-specifier containing the nested-name-specifier. |
| Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result); |
| ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); |
| ElabTL.setKeywordLoc(SourceLocation()); |
| ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| } |
| |
| return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
| } |
| |
| TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK, |
| TypeSpecifierType TagSpec, |
| SourceLocation TagLoc, |
| CXXScopeSpec &SS, |
| TemplateTy TemplateD, |
| SourceLocation TemplateLoc, |
| SourceLocation LAngleLoc, |
| ASTTemplateArgsPtr TemplateArgsIn, |
| SourceLocation RAngleLoc) { |
| TemplateName Template = TemplateD.getAsVal<TemplateName>(); |
| |
| // Translate the parser's template argument list in our AST format. |
| TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| |
| // Determine the tag kind |
| TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| ElaboratedTypeKeyword Keyword |
| = TypeWithKeyword::getKeywordForTagTypeKind(TagKind); |
| |
| if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
| QualType T = Context.getDependentTemplateSpecializationType(Keyword, |
| DTN->getQualifier(), |
| DTN->getIdentifier(), |
| TemplateArgs); |
| |
| // Build type-source information. |
| TypeLocBuilder TLB; |
| DependentTemplateSpecializationTypeLoc SpecTL |
| = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
| SpecTL.setKeywordLoc(TagLoc); |
| SpecTL.setNameLoc(TemplateLoc); |
| SpecTL.setLAngleLoc(LAngleLoc); |
| SpecTL.setRAngleLoc(RAngleLoc); |
| SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
| SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
| } |
| |
| if (TypeAliasTemplateDecl *TAT = |
| dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) { |
| // C++0x [dcl.type.elab]p2: |
| // If the identifier resolves to a typedef-name or the simple-template-id |
| // resolves to an alias template specialization, the |
| // elaborated-type-specifier is ill-formed. |
| Diag(TemplateLoc, diag::err_tag_reference_non_tag) << 4; |
| Diag(TAT->getLocation(), diag::note_declared_at); |
| } |
| |
| QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs); |
| if (Result.isNull()) |
| return TypeResult(); |
| |
| // Check the tag kind |
| if (const RecordType *RT = Result->getAs<RecordType>()) { |
| RecordDecl *D = RT->getDecl(); |
| |
| IdentifierInfo *Id = D->getIdentifier(); |
| assert(Id && "templated class must have an identifier"); |
| |
| if (!isAcceptableTagRedeclaration(D, TagKind, TagLoc, *Id)) { |
| Diag(TagLoc, diag::err_use_with_wrong_tag) |
| << Result |
| << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName()); |
| Diag(D->getLocation(), diag::note_previous_use); |
| } |
| } |
| |
| // Provide source-location information for the template specialization. |
| TypeLocBuilder TLB; |
| TemplateSpecializationTypeLoc SpecTL |
| = TLB.push<TemplateSpecializationTypeLoc>(Result); |
| SpecTL.setTemplateNameLoc(TemplateLoc); |
| SpecTL.setLAngleLoc(LAngleLoc); |
| SpecTL.setRAngleLoc(RAngleLoc); |
| for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
| SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
| |
| // Construct an elaborated type containing the nested-name-specifier (if any) |
| // and keyword. |
| Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result); |
| ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); |
| ElabTL.setKeywordLoc(TagLoc); |
| ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
| } |
| |
| ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS, |
| LookupResult &R, |
| bool RequiresADL, |
| const TemplateArgumentListInfo &TemplateArgs) { |
| // FIXME: Can we do any checking at this point? I guess we could check the |
| // template arguments that we have against the template name, if the template |
| // name refers to a single template. That's not a terribly common case, |
| // though. |
| // foo<int> could identify a single function unambiguously |
| // This approach does NOT work, since f<int>(1); |
| // gets resolved prior to resorting to overload resolution |
| // i.e., template<class T> void f(double); |
| // vs template<class T, class U> void f(U); |
| |
| // These should be filtered out by our callers. |
| assert(!R.empty() && "empty lookup results when building templateid"); |
| assert(!R.isAmbiguous() && "ambiguous lookup when building templateid"); |
| |
| // We don't want lookup warnings at this point. |
| R.suppressDiagnostics(); |
| |
| UnresolvedLookupExpr *ULE |
| = UnresolvedLookupExpr::Create(Context, R.getNamingClass(), |
| SS.getWithLocInContext(Context), |
| R.getLookupNameInfo(), |
| RequiresADL, TemplateArgs, |
| R.begin(), R.end()); |
| |
| return Owned(ULE); |
| } |
| |
| // We actually only call this from template instantiation. |
| ExprResult |
| Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS, |
| const DeclarationNameInfo &NameInfo, |
| const TemplateArgumentListInfo &TemplateArgs) { |
| DeclContext *DC; |
| if (!(DC = computeDeclContext(SS, false)) || |
| DC->isDependentContext() || |
| RequireCompleteDeclContext(SS, DC)) |
| return BuildDependentDeclRefExpr(SS, NameInfo, &TemplateArgs); |
| |
| bool MemberOfUnknownSpecialization; |
| LookupResult R(*this, NameInfo, LookupOrdinaryName); |
| LookupTemplateName(R, (Scope*) 0, SS, QualType(), /*Entering*/ false, |
| MemberOfUnknownSpecialization); |
| |
| if (R.isAmbiguous()) |
| return ExprError(); |
| |
| if (R.empty()) { |
| Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_non_template) |
| << NameInfo.getName() << SS.getRange(); |
| return ExprError(); |
| } |
| |
| if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) { |
| Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template) |
| << (NestedNameSpecifier*) SS.getScopeRep() |
| << NameInfo.getName() << SS.getRange(); |
| Diag(Temp->getLocation(), diag::note_referenced_class_template); |
| return ExprError(); |
| } |
| |
| return BuildTemplateIdExpr(SS, R, /* ADL */ false, TemplateArgs); |
| } |
| |
| /// \brief Form a dependent template name. |
| /// |
| /// This action forms a dependent template name given the template |
| /// name and its (presumably dependent) scope specifier. For |
| /// example, given "MetaFun::template apply", the scope specifier \p |
| /// SS will be "MetaFun::", \p TemplateKWLoc contains the location |
| /// of the "template" keyword, and "apply" is the \p Name. |
| TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S, |
| SourceLocation TemplateKWLoc, |
| CXXScopeSpec &SS, |
| UnqualifiedId &Name, |
| ParsedType ObjectType, |
| bool EnteringContext, |
| TemplateTy &Result) { |
| if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent() && |
| !getLangOptions().CPlusPlus0x) |
| Diag(TemplateKWLoc, diag::ext_template_outside_of_template) |
| << FixItHint::CreateRemoval(TemplateKWLoc); |
| |
| DeclContext *LookupCtx = 0; |
| if (SS.isSet()) |
| LookupCtx = computeDeclContext(SS, EnteringContext); |
| if (!LookupCtx && ObjectType) |
| LookupCtx = computeDeclContext(ObjectType.get()); |
| if (LookupCtx) { |
| // C++0x [temp.names]p5: |
| // If a name prefixed by the keyword template is not the name of |
| // a template, the program is ill-formed. [Note: the keyword |
| // template may not be applied to non-template members of class |
| // templates. -end note ] [ Note: as is the case with the |
| // typename prefix, the template prefix is allowed in cases |
| // where it is not strictly necessary; i.e., when the |
| // nested-name-specifier or the expression on the left of the -> |
| // or . is not dependent on a template-parameter, or the use |
| // does not appear in the scope of a template. -end note] |
| // |
| // Note: C++03 was more strict here, because it banned the use of |
| // the "template" keyword prior to a template-name that was not a |
| // dependent name. C++ DR468 relaxed this requirement (the |
| // "template" keyword is now permitted). We follow the C++0x |
| // rules, even in C++03 mode with a warning, retroactively applying the DR. |
| bool MemberOfUnknownSpecialization; |
| TemplateNameKind TNK = isTemplateName(0, SS, TemplateKWLoc.isValid(), Name, |
| ObjectType, EnteringContext, Result, |
| MemberOfUnknownSpecialization); |
| if (TNK == TNK_Non_template && LookupCtx->isDependentContext() && |
| isa<CXXRecordDecl>(LookupCtx) && |
| (!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() || |
| cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases())) { |
| // This is a dependent template. Handle it below. |
| } else if (TNK == TNK_Non_template) { |
| Diag(Name.getSourceRange().getBegin(), |
| diag::err_template_kw_refers_to_non_template) |
| << GetNameFromUnqualifiedId(Name).getName() |
| << Name.getSourceRange() |
| << TemplateKWLoc; |
| return TNK_Non_template; |
| } else { |
| // We found something; return it. |
| return TNK; |
| } |
| } |
| |
| NestedNameSpecifier *Qualifier |
| = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
| |
| switch (Name.getKind()) { |
| case UnqualifiedId::IK_Identifier: |
| Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier, |
| Name.Identifier)); |
| return TNK_Dependent_template_name; |
| |
| case UnqualifiedId::IK_OperatorFunctionId: |
| Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier, |
| Name.OperatorFunctionId.Operator)); |
| return TNK_Dependent_template_name; |
| |
| case UnqualifiedId::IK_LiteralOperatorId: |
| assert(false && "We don't support these; Parse shouldn't have allowed propagation"); |
| |
| default: |
| break; |
| } |
| |
| Diag(Name.getSourceRange().getBegin(), |
| diag::err_template_kw_refers_to_non_template) |
| << GetNameFromUnqualifiedId(Name).getName() |
| << Name.getSourceRange() |
| << TemplateKWLoc; |
| return TNK_Non_template; |
| } |
| |
| bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param, |
| const TemplateArgumentLoc &AL, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted) { |
| const TemplateArgument &Arg = AL.getArgument(); |
| |
| // Check template type parameter. |
| switch(Arg.getKind()) { |
| case TemplateArgument::Type: |
| // C++ [temp.arg.type]p1: |
| // A template-argument for a template-parameter which is a |
| // type shall be a type-id. |
| break; |
| case TemplateArgument::Template: { |
| // We have a template type parameter but the template argument |
| // is a template without any arguments. |
| SourceRange SR = AL.getSourceRange(); |
| TemplateName Name = Arg.getAsTemplate(); |
| Diag(SR.getBegin(), diag::err_template_missing_args) |
| << Name << SR; |
| if (TemplateDecl *Decl = Name.getAsTemplateDecl()) |
| Diag(Decl->getLocation(), diag::note_template_decl_here); |
| |
| return true; |
| } |
| default: { |
| // We have a template type parameter but the template argument |
| // is not a type. |
| SourceRange SR = AL.getSourceRange(); |
| Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR; |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| |
| return true; |
| } |
| } |
| |
| if (CheckTemplateArgument(Param, AL.getTypeSourceInfo())) |
| return true; |
| |
| // Add the converted template type argument. |
| Converted.push_back( |
| TemplateArgument(Context.getCanonicalType(Arg.getAsType()))); |
| return false; |
| } |
| |
| /// \brief Substitute template arguments into the default template argument for |
| /// the given template type parameter. |
| /// |
| /// \param SemaRef the semantic analysis object for which we are performing |
| /// the substitution. |
| /// |
| /// \param Template the template that we are synthesizing template arguments |
| /// for. |
| /// |
| /// \param TemplateLoc the location of the template name that started the |
| /// template-id we are checking. |
| /// |
| /// \param RAngleLoc the location of the right angle bracket ('>') that |
| /// terminates the template-id. |
| /// |
| /// \param Param the template template parameter whose default we are |
| /// substituting into. |
| /// |
| /// \param Converted the list of template arguments provided for template |
| /// parameters that precede \p Param in the template parameter list. |
| /// \returns the substituted template argument, or NULL if an error occurred. |
| static TypeSourceInfo * |
| SubstDefaultTemplateArgument(Sema &SemaRef, |
| TemplateDecl *Template, |
| SourceLocation TemplateLoc, |
| SourceLocation RAngleLoc, |
| TemplateTypeParmDecl *Param, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted) { |
| TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo(); |
| |
| // If the argument type is dependent, instantiate it now based |
| // on the previously-computed template arguments. |
| if (ArgType->getType()->isDependentType()) { |
| TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
| Converted.data(), Converted.size()); |
| |
| MultiLevelTemplateArgumentList AllTemplateArgs |
| = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs); |
| |
| Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, |
| Template, Converted.data(), |
| Converted.size(), |
| SourceRange(TemplateLoc, RAngleLoc)); |
| |
| ArgType = SemaRef.SubstType(ArgType, AllTemplateArgs, |
| Param->getDefaultArgumentLoc(), |
| Param->getDeclName()); |
| } |
| |
| return ArgType; |
| } |
| |
| /// \brief Substitute template arguments into the default template argument for |
| /// the given non-type template parameter. |
| /// |
| /// \param SemaRef the semantic analysis object for which we are performing |
| /// the substitution. |
| /// |
| /// \param Template the template that we are synthesizing template arguments |
| /// for. |
| /// |
| /// \param TemplateLoc the location of the template name that started the |
| /// template-id we are checking. |
| /// |
| /// \param RAngleLoc the location of the right angle bracket ('>') that |
| /// terminates the template-id. |
| /// |
| /// \param Param the non-type template parameter whose default we are |
| /// substituting into. |
| /// |
| /// \param Converted the list of template arguments provided for template |
| /// parameters that precede \p Param in the template parameter list. |
| /// |
| /// \returns the substituted template argument, or NULL if an error occurred. |
| static ExprResult |
| SubstDefaultTemplateArgument(Sema &SemaRef, |
| TemplateDecl *Template, |
| SourceLocation TemplateLoc, |
| SourceLocation RAngleLoc, |
| NonTypeTemplateParmDecl *Param, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted) { |
| TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
| Converted.data(), Converted.size()); |
| |
| MultiLevelTemplateArgumentList AllTemplateArgs |
| = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs); |
| |
| Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, |
| Template, Converted.data(), |
| Converted.size(), |
| SourceRange(TemplateLoc, RAngleLoc)); |
| |
| return SemaRef.SubstExpr(Param->getDefaultArgument(), AllTemplateArgs); |
| } |
| |
| /// \brief Substitute template arguments into the default template argument for |
| /// the given template template parameter. |
| /// |
| /// \param SemaRef the semantic analysis object for which we are performing |
| /// the substitution. |
| /// |
| /// \param Template the template that we are synthesizing template arguments |
| /// for. |
| /// |
| /// \param TemplateLoc the location of the template name that started the |
| /// template-id we are checking. |
| /// |
| /// \param RAngleLoc the location of the right angle bracket ('>') that |
| /// terminates the template-id. |
| /// |
| /// \param Param the template template parameter whose default we are |
| /// substituting into. |
| /// |
| /// \param Converted the list of template arguments provided for template |
| /// parameters that precede \p Param in the template parameter list. |
| /// |
| /// \param QualifierLoc Will be set to the nested-name-specifier (with |
| /// source-location information) that precedes the template name. |
| /// |
| /// \returns the substituted template argument, or NULL if an error occurred. |
| static TemplateName |
| SubstDefaultTemplateArgument(Sema &SemaRef, |
| TemplateDecl *Template, |
| SourceLocation TemplateLoc, |
| SourceLocation RAngleLoc, |
| TemplateTemplateParmDecl *Param, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted, |
| NestedNameSpecifierLoc &QualifierLoc) { |
| TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
| Converted.data(), Converted.size()); |
| |
| MultiLevelTemplateArgumentList AllTemplateArgs |
| = SemaRef.getTemplateInstantiationArgs(Template, &TemplateArgs); |
| |
| Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, |
| Template, Converted.data(), |
| Converted.size(), |
| SourceRange(TemplateLoc, RAngleLoc)); |
| |
| // Substitute into the nested-name-specifier first, |
| QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc(); |
| if (QualifierLoc) { |
| QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, |
| AllTemplateArgs); |
| if (!QualifierLoc) |
| return TemplateName(); |
| } |
| |
| return SemaRef.SubstTemplateName(QualifierLoc, |
| Param->getDefaultArgument().getArgument().getAsTemplate(), |
| Param->getDefaultArgument().getTemplateNameLoc(), |
| AllTemplateArgs); |
| } |
| |
| /// \brief If the given template parameter has a default template |
| /// argument, substitute into that default template argument and |
| /// return the corresponding template argument. |
| TemplateArgumentLoc |
| Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template, |
| SourceLocation TemplateLoc, |
| SourceLocation RAngleLoc, |
| Decl *Param, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted) { |
| if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) { |
| if (!TypeParm->hasDefaultArgument()) |
| return TemplateArgumentLoc(); |
| |
| TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template, |
| TemplateLoc, |
| RAngleLoc, |
| TypeParm, |
| Converted); |
| if (DI) |
| return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI); |
| |
| return TemplateArgumentLoc(); |
| } |
| |
| if (NonTypeTemplateParmDecl *NonTypeParm |
| = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
| if (!NonTypeParm->hasDefaultArgument()) |
| return TemplateArgumentLoc(); |
| |
| ExprResult Arg = SubstDefaultTemplateArgument(*this, Template, |
| TemplateLoc, |
| RAngleLoc, |
| NonTypeParm, |
| Converted); |
| if (Arg.isInvalid()) |
| return TemplateArgumentLoc(); |
| |
| Expr *ArgE = Arg.takeAs<Expr>(); |
| return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE); |
| } |
| |
| TemplateTemplateParmDecl *TempTempParm |
| = cast<TemplateTemplateParmDecl>(Param); |
| if (!TempTempParm->hasDefaultArgument()) |
| return TemplateArgumentLoc(); |
| |
| |
| NestedNameSpecifierLoc QualifierLoc; |
| TemplateName TName = SubstDefaultTemplateArgument(*this, Template, |
| TemplateLoc, |
| RAngleLoc, |
| TempTempParm, |
| Converted, |
| QualifierLoc); |
| if (TName.isNull()) |
| return TemplateArgumentLoc(); |
| |
| return TemplateArgumentLoc(TemplateArgument(TName), |
| TempTempParm->getDefaultArgument().getTemplateQualifierLoc(), |
| TempTempParm->getDefaultArgument().getTemplateNameLoc()); |
| } |
| |
| /// \brief Check that the given template argument corresponds to the given |
| /// template parameter. |
| /// |
| /// \param Param The template parameter against which the argument will be |
| /// checked. |
| /// |
| /// \param Arg The template argument. |
| /// |
| /// \param Template The template in which the template argument resides. |
| /// |
| /// \param TemplateLoc The location of the template name for the template |
| /// whose argument list we're matching. |
| /// |
| /// \param RAngleLoc The location of the right angle bracket ('>') that closes |
| /// the template argument list. |
| /// |
| /// \param ArgumentPackIndex The index into the argument pack where this |
| /// argument will be placed. Only valid if the parameter is a parameter pack. |
| /// |
| /// \param Converted The checked, converted argument will be added to the |
| /// end of this small vector. |
| /// |
| /// \param CTAK Describes how we arrived at this particular template argument: |
| /// explicitly written, deduced, etc. |
| /// |
| /// \returns true on error, false otherwise. |
| bool Sema::CheckTemplateArgument(NamedDecl *Param, |
| const TemplateArgumentLoc &Arg, |
| NamedDecl *Template, |
| SourceLocation TemplateLoc, |
| SourceLocation RAngleLoc, |
| unsigned ArgumentPackIndex, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted, |
| CheckTemplateArgumentKind CTAK) { |
| // Check template type parameters. |
| if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) |
| return CheckTemplateTypeArgument(TTP, Arg, Converted); |
| |
| // Check non-type template parameters. |
| if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
| // Do substitution on the type of the non-type template parameter |
| // with the template arguments we've seen thus far. But if the |
| // template has a dependent context then we cannot substitute yet. |
| QualType NTTPType = NTTP->getType(); |
| if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack()) |
| NTTPType = NTTP->getExpansionType(ArgumentPackIndex); |
| |
| if (NTTPType->isDependentType() && |
| !isa<TemplateTemplateParmDecl>(Template) && |
| !Template->getDeclContext()->isDependentContext()) { |
| // Do substitution on the type of the non-type template parameter. |
| InstantiatingTemplate Inst(*this, TemplateLoc, Template, |
| NTTP, Converted.data(), Converted.size(), |
| SourceRange(TemplateLoc, RAngleLoc)); |
| |
| TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
| Converted.data(), Converted.size()); |
| NTTPType = SubstType(NTTPType, |
| MultiLevelTemplateArgumentList(TemplateArgs), |
| NTTP->getLocation(), |
| NTTP->getDeclName()); |
| // If that worked, check the non-type template parameter type |
| // for validity. |
| if (!NTTPType.isNull()) |
| NTTPType = CheckNonTypeTemplateParameterType(NTTPType, |
| NTTP->getLocation()); |
| if (NTTPType.isNull()) |
| return true; |
| } |
| |
| switch (Arg.getArgument().getKind()) { |
| case TemplateArgument::Null: |
| assert(false && "Should never see a NULL template argument here"); |
| return true; |
| |
| case TemplateArgument::Expression: { |
| TemplateArgument Result; |
| ExprResult Res = |
| CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(), |
| Result, CTAK); |
| if (Res.isInvalid()) |
| return true; |
| |
| Converted.push_back(Result); |
| break; |
| } |
| |
| case TemplateArgument::Declaration: |
| case TemplateArgument::Integral: |
| // We've already checked this template argument, so just copy |
| // it to the list of converted arguments. |
| Converted.push_back(Arg.getArgument()); |
| break; |
| |
| case TemplateArgument::Template: |
| case TemplateArgument::TemplateExpansion: |
| // We were given a template template argument. It may not be ill-formed; |
| // see below. |
| if (DependentTemplateName *DTN |
| = Arg.getArgument().getAsTemplateOrTemplatePattern() |
| .getAsDependentTemplateName()) { |
| // We have a template argument such as \c T::template X, which we |
| // parsed as a template template argument. However, since we now |
| // know that we need a non-type template argument, convert this |
| // template name into an expression. |
| |
| DeclarationNameInfo NameInfo(DTN->getIdentifier(), |
| Arg.getTemplateNameLoc()); |
| |
| CXXScopeSpec SS; |
| SS.Adopt(Arg.getTemplateQualifierLoc()); |
| ExprResult E = Owned(DependentScopeDeclRefExpr::Create(Context, |
| SS.getWithLocInContext(Context), |
| NameInfo)); |
| |
| // If we parsed the template argument as a pack expansion, create a |
| // pack expansion expression. |
| if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){ |
| E = ActOnPackExpansion(E.take(), Arg.getTemplateEllipsisLoc()); |
| if (E.isInvalid()) |
| return true; |
| } |
| |
| TemplateArgument Result; |
| E = CheckTemplateArgument(NTTP, NTTPType, E.take(), Result); |
| if (E.isInvalid()) |
| return true; |
| |
| Converted.push_back(Result); |
| break; |
| } |
| |
| // We have a template argument that actually does refer to a class |
| // template, alias template, or template template parameter, and |
| // therefore cannot be a non-type template argument. |
| Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr) |
| << Arg.getSourceRange(); |
| |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| |
| case TemplateArgument::Type: { |
| // We have a non-type template parameter but the template |
| // argument is a type. |
| |
| // C++ [temp.arg]p2: |
| // In a template-argument, an ambiguity between a type-id and |
| // an expression is resolved to a type-id, regardless of the |
| // form of the corresponding template-parameter. |
| // |
| // We warn specifically about this case, since it can be rather |
| // confusing for users. |
| QualType T = Arg.getArgument().getAsType(); |
| SourceRange SR = Arg.getSourceRange(); |
| if (T->isFunctionType()) |
| Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T; |
| else |
| Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR; |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| case TemplateArgument::Pack: |
| llvm_unreachable("Caller must expand template argument packs"); |
| break; |
| } |
| |
| return false; |
| } |
| |
| |
| // Check template template parameters. |
| TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param); |
| |
| // Substitute into the template parameter list of the template |
| // template parameter, since previously-supplied template arguments |
| // may appear within the template template parameter. |
| { |
| // Set up a template instantiation context. |
| LocalInstantiationScope Scope(*this); |
| InstantiatingTemplate Inst(*this, TemplateLoc, Template, |
| TempParm, Converted.data(), Converted.size(), |
| SourceRange(TemplateLoc, RAngleLoc)); |
| |
| TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
| Converted.data(), Converted.size()); |
| TempParm = cast_or_null<TemplateTemplateParmDecl>( |
| SubstDecl(TempParm, CurContext, |
| MultiLevelTemplateArgumentList(TemplateArgs))); |
| if (!TempParm) |
| return true; |
| } |
| |
| switch (Arg.getArgument().getKind()) { |
| case TemplateArgument::Null: |
| assert(false && "Should never see a NULL template argument here"); |
| return true; |
| |
| case TemplateArgument::Template: |
| case TemplateArgument::TemplateExpansion: |
| if (CheckTemplateArgument(TempParm, Arg)) |
| return true; |
| |
| Converted.push_back(Arg.getArgument()); |
| break; |
| |
| case TemplateArgument::Expression: |
| case TemplateArgument::Type: |
| // We have a template template parameter but the template |
| // argument does not refer to a template. |
| Diag(Arg.getLocation(), diag::err_template_arg_must_be_template) |
| << getLangOptions().CPlusPlus0x; |
| return true; |
| |
| case TemplateArgument::Declaration: |
| llvm_unreachable( |
| "Declaration argument with template template parameter"); |
| break; |
| case TemplateArgument::Integral: |
| llvm_unreachable( |
| "Integral argument with template template parameter"); |
| break; |
| |
| case TemplateArgument::Pack: |
| llvm_unreachable("Caller must expand template argument packs"); |
| break; |
| } |
| |
| return false; |
| } |
| |
| /// \brief Check that the given template argument list is well-formed |
| /// for specializing the given template. |
| bool Sema::CheckTemplateArgumentList(TemplateDecl *Template, |
| SourceLocation TemplateLoc, |
| TemplateArgumentListInfo &TemplateArgs, |
| bool PartialTemplateArgs, |
| llvm::SmallVectorImpl<TemplateArgument> &Converted) { |
| TemplateParameterList *Params = Template->getTemplateParameters(); |
| unsigned NumParams = Params->size(); |
| unsigned NumArgs = TemplateArgs.size(); |
| bool Invalid = false; |
| |
| SourceLocation RAngleLoc = TemplateArgs.getRAngleLoc(); |
| |
| bool HasParameterPack = |
| NumParams > 0 && Params->getParam(NumParams - 1)->isTemplateParameterPack(); |
| |
| if ((NumArgs > NumParams && !HasParameterPack) || |
| (NumArgs < Params->getMinRequiredArguments() && |
| !PartialTemplateArgs)) { |
| // FIXME: point at either the first arg beyond what we can handle, |
| // or the '>', depending on whether we have too many or too few |
| // arguments. |
| SourceRange Range; |
| if (NumArgs > NumParams) |
| Range = SourceRange(TemplateArgs[NumParams].getLocation(), RAngleLoc); |
| Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
| << (NumArgs > NumParams) |
| << (isa<ClassTemplateDecl>(Template)? 0 : |
| isa<FunctionTemplateDecl>(Template)? 1 : |
| isa<TemplateTemplateParmDecl>(Template)? 2 : 3) |
| << Template << Range; |
| Diag(Template->getLocation(), diag::note_template_decl_here) |
| << Params->getSourceRange(); |
| Invalid = true; |
| } |
| |
| // C++ [temp.arg]p1: |
| // [...] The type and form of each template-argument specified in |
| // a template-id shall match the type and form specified for the |
| // corresponding parameter declared by the template in its |
| // template-parameter-list. |
| bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template); |
| llvm::SmallVector<TemplateArgument, 2> ArgumentPack; |
| TemplateParameterList::iterator Param = Params->begin(), |
| ParamEnd = Params->end(); |
| unsigned ArgIdx = 0; |
| LocalInstantiationScope InstScope(*this, true); |
| while (Param != ParamEnd) { |
| if (ArgIdx > NumArgs && PartialTemplateArgs) |
| break; |
| |
| if (ArgIdx < NumArgs) { |
| // If we have an expanded parameter pack, make sure we don't have too |
| // many arguments. |
| if (NonTypeTemplateParmDecl *NTTP |
| = dyn_cast<NonTypeTemplateParmDecl>(*Param)) { |
| if (NTTP->isExpandedParameterPack() && |
| ArgumentPack.size() >= NTTP->getNumExpansionTypes()) { |
| Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
| << true |
| << (isa<ClassTemplateDecl>(Template)? 0 : |
| isa<FunctionTemplateDecl>(Template)? 1 : |
| isa<TemplateTemplateParmDecl>(Template)? 2 : 3) |
| << Template; |
| Diag(Template->getLocation(), diag::note_template_decl_here) |
| << Params->getSourceRange(); |
| return true; |
| } |
| } |
| |
| // Check the template argument we were given. |
| if (CheckTemplateArgument(*Param, TemplateArgs[ArgIdx], Template, |
| TemplateLoc, RAngleLoc, |
| ArgumentPack.size(), Converted)) |
| return true; |
| |
| if ((*Param)->isTemplateParameterPack()) { |
| // The template parameter was a template parameter pack, so take the |
| // deduced argument and place it on the argument pack. Note that we |
| // stay on the same template parameter so that we can deduce more |
| // arguments. |
| ArgumentPack.push_back(Converted.back()); |
| Converted.pop_back(); |
| } else { |
| // Move to the next template parameter. |
| ++Param; |
| } |
| ++ArgIdx; |
| continue; |
| } |
| |
| // If we have a template parameter pack with no more corresponding |
| // arguments, just break out now and we'll fill in the argument pack below. |
| if ((*Param)->isTemplateParameterPack()) |
| break; |
| |
| // If our template is a template template parameter that hasn't acquired |
| // its proper context yet (e.g., because we're using the template template |
| // parameter in the signature of a function template, before we've built |
| // the function template itself), don't attempt substitution of default |
| // template arguments at this point: we don't have enough context to |
| // do it properly. |
| if (isTemplateTemplateParameter && |
| Template->getDeclContext()->isTranslationUnit()) |
| break; |
| |
| // We have a default template argument that we will use. |
| TemplateArgumentLoc Arg; |
| |
| // Retrieve the default template argument from the template |
| // parameter. For each kind of template parameter, we substitute the |
| // template arguments provided thus far and any "outer" template arguments |
| // (when the template parameter was part of a nested template) into |
| // the default argument. |
| if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) { |
| if (!TTP->hasDefaultArgument()) { |
| assert((Invalid || PartialTemplateArgs) && "Missing default argument"); |
| break; |
| } |
| |
| TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this, |
| Template, |
| TemplateLoc, |
| RAngleLoc, |
| TTP, |
| Converted); |
| if (!ArgType) |
| return true; |
| |
| Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()), |
| ArgType); |
| } else if (NonTypeTemplateParmDecl *NTTP |
| = dyn_cast<NonTypeTemplateParmDecl>(*Param)) { |
| if (!NTTP->hasDefaultArgument()) { |
| assert((Invalid || PartialTemplateArgs) && "Missing default argument"); |
| break; |
| } |
| |
| ExprResult E = SubstDefaultTemplateArgument(*this, Template, |
| TemplateLoc, |
| RAngleLoc, |
| NTTP, |
| Converted); |
| if (E.isInvalid()) |
| return true; |
| |
| Expr *Ex = E.takeAs<Expr>(); |
| Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex); |
| } else { |
| TemplateTemplateParmDecl *TempParm |
| = cast<TemplateTemplateParmDecl>(*Param); |
| |
| if (!TempParm->hasDefaultArgument()) { |
| assert((Invalid || PartialTemplateArgs) && "Missing default argument"); |
| break; |
| } |
| |
| NestedNameSpecifierLoc QualifierLoc; |
| TemplateName Name = SubstDefaultTemplateArgument(*this, Template, |
| TemplateLoc, |
| RAngleLoc, |
| TempParm, |
| Converted, |
| QualifierLoc); |
| if (Name.isNull()) |
| return true; |
| |
| Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc, |
| TempParm->getDefaultArgument().getTemplateNameLoc()); |
| } |
| |
| // Introduce an instantiation record that describes where we are using |
| // the default template argument. |
| InstantiatingTemplate Instantiating(*this, RAngleLoc, Template, *Param, |
| Converted.data(), Converted.size(), |
| SourceRange(TemplateLoc, RAngleLoc)); |
| |
| // Check the default template argument. |
| if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc, |
| RAngleLoc, 0, Converted)) |
| return true; |
| |
| // Core issue 150 (assumed resolution): if this is a template template |
| // parameter, keep track of the default template arguments from the |
| // template definition. |
| if (isTemplateTemplateParameter) |
| TemplateArgs.addArgument(Arg); |
| |
| // Move to the next template parameter and argument. |
| ++Param; |
| ++ArgIdx; |
| } |
| |
| // Form argument packs for each of the parameter packs remaining. |
| while (Param != ParamEnd) { |
| // If we're checking a partial list of template arguments, don't fill |
| // in arguments for non-template parameter packs. |
| |
| if ((*Param)->isTemplateParameterPack()) { |
| if (PartialTemplateArgs && ArgumentPack.empty()) { |
| Converted.push_back(TemplateArgument()); |
| } else if (ArgumentPack.empty()) |
| Converted.push_back(TemplateArgument(0, 0)); |
| else { |
| Converted.push_back(TemplateArgument::CreatePackCopy(Context, |
| ArgumentPack.data(), |
| ArgumentPack.size())); |
| ArgumentPack.clear(); |
| } |
| } |
| |
| ++Param; |
| } |
| |
| return Invalid; |
| } |
| |
| namespace { |
| class UnnamedLocalNoLinkageFinder |
| : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool> |
| { |
| Sema &S; |
| SourceRange SR; |
| |
| typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited; |
| |
| public: |
| UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { } |
| |
| bool Visit(QualType T) { |
| return inherited::Visit(T.getTypePtr()); |
| } |
| |
| #define TYPE(Class, Parent) \ |
| bool Visit##Class##Type(const Class##Type *); |
| #define ABSTRACT_TYPE(Class, Parent) \ |
| bool Visit##Class##Type(const Class##Type *) { return false; } |
| #define NON_CANONICAL_TYPE(Class, Parent) \ |
| bool Visit##Class##Type(const Class##Type *) { return false; } |
| #include "clang/AST/TypeNodes.def" |
| |
| bool VisitTagDecl(const TagDecl *Tag); |
| bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS); |
| }; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) { |
| return Visit(T->getPointeeType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType( |
| const BlockPointerType* T) { |
| return Visit(T->getPointeeType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType( |
| const LValueReferenceType* T) { |
| return Visit(T->getPointeeType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType( |
| const RValueReferenceType* T) { |
| return Visit(T->getPointeeType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType( |
| const MemberPointerType* T) { |
| return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0)); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType( |
| const ConstantArrayType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType( |
| const IncompleteArrayType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType( |
| const VariableArrayType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType( |
| const DependentSizedArrayType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType( |
| const DependentSizedExtVectorType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) { |
| return Visit(T->getElementType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType( |
| const FunctionProtoType* T) { |
| for (FunctionProtoType::arg_type_iterator A = T->arg_type_begin(), |
| AEnd = T->arg_type_end(); |
| A != AEnd; ++A) { |
| if (Visit(*A)) |
| return true; |
| } |
| |
| return Visit(T->getResultType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType( |
| const FunctionNoProtoType* T) { |
| return Visit(T->getResultType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType( |
| const UnresolvedUsingType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) { |
| return Visit(T->getUnderlyingType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType( |
| const UnaryTransformType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) { |
| return Visit(T->getDeducedType()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) { |
| return VisitTagDecl(T->getDecl()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) { |
| return VisitTagDecl(T->getDecl()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType( |
| const TemplateTypeParmType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType( |
| const SubstTemplateTypeParmPackType *) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType( |
| const TemplateSpecializationType*) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType( |
| const InjectedClassNameType* T) { |
| return VisitTagDecl(T->getDecl()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitDependentNameType( |
| const DependentNameType* T) { |
| return VisitNestedNameSpecifier(T->getQualifier()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType( |
| const DependentTemplateSpecializationType* T) { |
| return VisitNestedNameSpecifier(T->getQualifier()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType( |
| const PackExpansionType* T) { |
| return Visit(T->getPattern()); |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType( |
| const ObjCInterfaceType *) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType( |
| const ObjCObjectPointerType *) { |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) { |
| if (Tag->getDeclContext()->isFunctionOrMethod()) { |
| S.Diag(SR.getBegin(), diag::ext_template_arg_local_type) |
| << S.Context.getTypeDeclType(Tag) << SR; |
| return true; |
| } |
| |
| if (!Tag->getDeclName() && !Tag->getTypedefNameForAnonDecl()) { |
| S.Diag(SR.getBegin(), diag::ext_template_arg_unnamed_type) << SR; |
| S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier( |
| NestedNameSpecifier *NNS) { |
| if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix())) |
| return true; |
| |
| switch (NNS->getKind()) { |
| case NestedNameSpecifier::Identifier: |
| case NestedNameSpecifier::Namespace: |
| case NestedNameSpecifier::NamespaceAlias: |
| case NestedNameSpecifier::Global: |
| return false; |
| |
| case NestedNameSpecifier::TypeSpec: |
| case NestedNameSpecifier::TypeSpecWithTemplate: |
| return Visit(QualType(NNS->getAsType(), 0)); |
| } |
| return false; |
| } |
| |
| |
| /// \brief Check a template argument against its corresponding |
| /// template type parameter. |
| /// |
| /// This routine implements the semantics of C++ [temp.arg.type]. It |
| /// returns true if an error occurred, and false otherwise. |
| bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param, |
| TypeSourceInfo *ArgInfo) { |
| assert(ArgInfo && "invalid TypeSourceInfo"); |
| QualType Arg = ArgInfo->getType(); |
| SourceRange SR = ArgInfo->getTypeLoc().getSourceRange(); |
| |
| if (Arg->isVariablyModifiedType()) { |
| return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg; |
| } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) { |
| return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR; |
| } |
| |
| // C++03 [temp.arg.type]p2: |
| // A local type, a type with no linkage, an unnamed type or a type |
| // compounded from any of these types shall not be used as a |
| // template-argument for a template type-parameter. |
| // |
| // C++0x allows these, and even in C++03 we allow them as an extension with |
| // a warning. |
| if (!LangOpts.CPlusPlus0x && Arg->hasUnnamedOrLocalType()) { |
| UnnamedLocalNoLinkageFinder Finder(*this, SR); |
| (void)Finder.Visit(Context.getCanonicalType(Arg)); |
| } |
| |
| return false; |
| } |
| |
| /// \brief Checks whether the given template argument is the address |
| /// of an object or function according to C++ [temp.arg.nontype]p1. |
| static bool |
| CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S, |
| NonTypeTemplateParmDecl *Param, |
| QualType ParamType, |
| Expr *ArgIn, |
| TemplateArgument &Converted) { |
| bool Invalid = false; |
| Expr *Arg = ArgIn; |
| QualType ArgType = Arg->getType(); |
| |
| // See through any implicit casts we added to fix the type. |
| while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) |
| Arg = Cast->getSubExpr(); |
| |
| // C++ [temp.arg.nontype]p1: |
| // |
| // A template-argument for a non-type, non-template |
| // template-parameter shall be one of: [...] |
| // |
| // -- the address of an object or function with external |
| // linkage, including function templates and function |
| // template-ids but excluding non-static class members, |
| // expressed as & id-expression where the & is optional if |
| // the name refers to a function or array, or if the |
| // corresponding template-parameter is a reference; or |
| DeclRefExpr *DRE = 0; |
| |
| // In C++98/03 mode, give an extension warning on any extra parentheses. |
| // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 |
| bool ExtraParens = false; |
| while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { |
| if (!Invalid && !ExtraParens && !S.getLangOptions().CPlusPlus0x) { |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::ext_template_arg_extra_parens) |
| << Arg->getSourceRange(); |
| ExtraParens = true; |
| } |
| |
| Arg = Parens->getSubExpr(); |
| } |
| |
| bool AddressTaken = false; |
| SourceLocation AddrOpLoc; |
| if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
| if (UnOp->getOpcode() == UO_AddrOf) { |
| // Support &__uuidof(class_with_uuid) as a non-type template argument. |
| // Very common in Microsoft COM headers. |
| if (S.getLangOptions().Microsoft && |
| isa<CXXUuidofExpr>(UnOp->getSubExpr())) { |
| Converted = TemplateArgument(ArgIn); |
| return false; |
| } |
| |
| DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr()); |
| AddressTaken = true; |
| AddrOpLoc = UnOp->getOperatorLoc(); |
| } |
| } else { |
| if (S.getLangOptions().Microsoft && isa<CXXUuidofExpr>(Arg)) { |
| Converted = TemplateArgument(ArgIn); |
| return false; |
| } |
| DRE = dyn_cast<DeclRefExpr>(Arg); |
| } |
| if (!DRE) { |
| S.Diag(Arg->getLocStart(), diag::err_template_arg_not_decl_ref) |
| << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| // Stop checking the precise nature of the argument if it is value dependent, |
| // it should be checked when instantiated. |
| if (Arg->isValueDependent()) { |
| Converted = TemplateArgument(ArgIn); |
| return false; |
| } |
| |
| if (!isa<ValueDecl>(DRE->getDecl())) { |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_object_or_func_form) |
| << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| NamedDecl *Entity = 0; |
| |
| // Cannot refer to non-static data members |
| if (FieldDecl *Field = dyn_cast<FieldDecl>(DRE->getDecl())) { |
| S.Diag(Arg->getSourceRange().getBegin(), diag::err_template_arg_field) |
| << Field << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| // Cannot refer to non-static member functions |
| if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(DRE->getDecl())) |
| if (!Method->isStatic()) { |
| S.Diag(Arg->getSourceRange().getBegin(), diag::err_template_arg_method) |
| << Method << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| // Functions must have external linkage. |
| if (FunctionDecl *Func = dyn_cast<FunctionDecl>(DRE->getDecl())) { |
| if (!isExternalLinkage(Func->getLinkage())) { |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_function_not_extern) |
| << Func << Arg->getSourceRange(); |
| S.Diag(Func->getLocation(), diag::note_template_arg_internal_object) |
| << true; |
| return true; |
| } |
| |
| // Okay: we've named a function with external linkage. |
| Entity = Func; |
| |
| // If the template parameter has pointer type, the function decays. |
| if (ParamType->isPointerType() && !AddressTaken) |
| ArgType = S.Context.getPointerType(Func->getType()); |
| else if (AddressTaken && ParamType->isReferenceType()) { |
| // If we originally had an address-of operator, but the |
| // parameter has reference type, complain and (if things look |
| // like they will work) drop the address-of operator. |
| if (!S.Context.hasSameUnqualifiedType(Func->getType(), |
| ParamType.getNonReferenceType())) { |
| S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
| << ParamType; |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
| << ParamType |
| << FixItHint::CreateRemoval(AddrOpLoc); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| |
| ArgType = Func->getType(); |
| } |
| } else if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { |
| if (!isExternalLinkage(Var->getLinkage())) { |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_object_not_extern) |
| << Var << Arg->getSourceRange(); |
| S.Diag(Var->getLocation(), diag::note_template_arg_internal_object) |
| << true; |
| return true; |
| } |
| |
| // A value of reference type is not an object. |
| if (Var->getType()->isReferenceType()) { |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_reference_var) |
| << Var->getType() << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| // Okay: we've named an object with external linkage |
| Entity = Var; |
| |
| // If the template parameter has pointer type, we must have taken |
| // the address of this object. |
| if (ParamType->isReferenceType()) { |
| if (AddressTaken) { |
| // If we originally had an address-of operator, but the |
| // parameter has reference type, complain and (if things look |
| // like they will work) drop the address-of operator. |
| if (!S.Context.hasSameUnqualifiedType(Var->getType(), |
| ParamType.getNonReferenceType())) { |
| S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
| << ParamType; |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
| << ParamType |
| << FixItHint::CreateRemoval(AddrOpLoc); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| |
| ArgType = Var->getType(); |
| } |
| } else if (!AddressTaken && ParamType->isPointerType()) { |
| if (Var->getType()->isArrayType()) { |
| // Array-to-pointer decay. |
| ArgType = S.Context.getArrayDecayedType(Var->getType()); |
| } else { |
| // If the template parameter has pointer type but the address of |
| // this object was not taken, complain and (possibly) recover by |
| // taking the address of the entity. |
| ArgType = S.Context.getPointerType(Var->getType()); |
| if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) { |
| S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of) |
| << ParamType; |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| |
| S.Diag(Arg->getLocStart(), diag::err_template_arg_not_address_of) |
| << ParamType |
| << FixItHint::CreateInsertion(Arg->getLocStart(), "&"); |
| |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| } |
| } |
| } else { |
| // We found something else, but we don't know specifically what it is. |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_object_or_func) |
| << Arg->getSourceRange(); |
| S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here); |
| return true; |
| } |
| |
| if (ParamType->isPointerType() && |
| !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() && |
| S.IsQualificationConversion(ArgType, ParamType, false)) { |
| // For pointer-to-object types, qualification conversions are |
| // permitted. |
| } else { |
| if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) { |
| if (!ParamRef->getPointeeType()->isFunctionType()) { |
| // C++ [temp.arg.nontype]p5b3: |
| // For a non-type template-parameter of type reference to |
| // object, no conversions apply. The type referred to by the |
| // reference may be more cv-qualified than the (otherwise |
| // identical) type of the template- argument. The |
| // template-parameter is bound directly to the |
| // template-argument, which shall be an lvalue. |
| |
| // FIXME: Other qualifiers? |
| unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers(); |
| unsigned ArgQuals = ArgType.getCVRQualifiers(); |
| |
| if ((ParamQuals | ArgQuals) != ParamQuals) { |
| S.Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_ref_bind_ignores_quals) |
| << ParamType << Arg->getType() |
| << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| } |
| } |
| |
| // At this point, the template argument refers to an object or |
| // function with external linkage. We now need to check whether the |
| // argument and parameter types are compatible. |
| if (!S.Context.hasSameUnqualifiedType(ArgType, |
| ParamType.getNonReferenceType())) { |
| // We can't perform this conversion or binding. |
| if (ParamType->isReferenceType()) |
| S.Diag(Arg->getLocStart(), diag::err_template_arg_no_ref_bind) |
| << ParamType << Arg->getType() << Arg->getSourceRange(); |
| else |
| S.Diag(Arg->getLocStart(), diag::err_template_arg_not_convertible) |
| << Arg->getType() << ParamType << Arg->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| } |
| |
| // Create the template argument. |
| Converted = TemplateArgument(Entity->getCanonicalDecl()); |
| S.MarkDeclarationReferenced(Arg->getLocStart(), Entity); |
| return false; |
| } |
| |
| /// \brief Checks whether the given template argument is a pointer to |
| /// member constant according to C++ [temp.arg.nontype]p1. |
| bool Sema::CheckTemplateArgumentPointerToMember(Expr *Arg, |
| TemplateArgument &Converted) { |
| bool Invalid = false; |
| |
| // See through any implicit casts we added to fix the type. |
| while (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) |
| Arg = Cast->getSubExpr(); |
| |
| // C++ [temp.arg.nontype]p1: |
| // |
| // A template-argument for a non-type, non-template |
| // template-parameter shall be one of: [...] |
| // |
| // -- a pointer to member expressed as described in 5.3.1. |
| DeclRefExpr *DRE = 0; |
| |
| // In C++98/03 mode, give an extension warning on any extra parentheses. |
| // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 |
| bool ExtraParens = false; |
| while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { |
| if (!Invalid && !ExtraParens && !getLangOptions().CPlusPlus0x) { |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::ext_template_arg_extra_parens) |
| << Arg->getSourceRange(); |
| ExtraParens = true; |
| } |
| |
| Arg = Parens->getSubExpr(); |
| } |
| |
| // A pointer-to-member constant written &Class::member. |
| if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
| if (UnOp->getOpcode() == UO_AddrOf) { |
| DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr()); |
| if (DRE && !DRE->getQualifier()) |
| DRE = 0; |
| } |
| } |
| // A constant of pointer-to-member type. |
| else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) { |
| if (ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) { |
| if (VD->getType()->isMemberPointerType()) { |
| if (isa<NonTypeTemplateParmDecl>(VD) || |
| (isa<VarDecl>(VD) && |
| Context.getCanonicalType(VD->getType()).isConstQualified())) { |
| if (Arg->isTypeDependent() || Arg->isValueDependent()) |
| Converted = TemplateArgument(Arg); |
| else |
| Converted = TemplateArgument(VD->getCanonicalDecl()); |
| return Invalid; |
| } |
| } |
| } |
| |
| DRE = 0; |
| } |
| |
| if (!DRE) |
| return Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_pointer_to_member_form) |
| << Arg->getSourceRange(); |
| |
| if (isa<FieldDecl>(DRE->getDecl()) || isa<CXXMethodDecl>(DRE->getDecl())) { |
| assert((isa<FieldDecl>(DRE->getDecl()) || |
| !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && |
| "Only non-static member pointers can make it here"); |
| |
| // Okay: this is the address of a non-static member, and therefore |
| // a member pointer constant. |
| if (Arg->isTypeDependent() || Arg->isValueDependent()) |
| Converted = TemplateArgument(Arg); |
| else |
| Converted = TemplateArgument(DRE->getDecl()->getCanonicalDecl()); |
| return Invalid; |
| } |
| |
| // We found something else, but we don't know specifically what it is. |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_pointer_to_member_form) |
| << Arg->getSourceRange(); |
| Diag(DRE->getDecl()->getLocation(), |
| diag::note_template_arg_refers_here); |
| return true; |
| } |
| |
| /// \brief Check a template argument against its corresponding |
| /// non-type template parameter. |
| /// |
| /// This routine implements the semantics of C++ [temp.arg.nontype]. |
| /// If an error occurred, it returns ExprError(); otherwise, it |
| /// returns the converted template argument. \p |
| /// InstantiatedParamType is the type of the non-type template |
| /// parameter after it has been instantiated. |
| ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param, |
| QualType InstantiatedParamType, Expr *Arg, |
| TemplateArgument &Converted, |
| CheckTemplateArgumentKind CTAK) { |
| SourceLocation StartLoc = Arg->getSourceRange().getBegin(); |
| |
| // If either the parameter has a dependent type or the argument is |
| // type-dependent, there's nothing we can check now. |
| if (InstantiatedParamType->isDependentType() || Arg->isTypeDependent()) { |
| // FIXME: Produce a cloned, canonical expression? |
| Converted = TemplateArgument(Arg); |
| return Owned(Arg); |
| } |
| |
| // C++ [temp.arg.nontype]p5: |
| // The following conversions are performed on each expression used |
| // as a non-type template-argument. If a non-type |
| // template-argument cannot be converted to the type of the |
| // corresponding template-parameter then the program is |
| // ill-formed. |
| // |
| // -- for a non-type template-parameter of integral or |
| // enumeration type, integral promotions (4.5) and integral |
| // conversions (4.7) are applied. |
| QualType ParamType = InstantiatedParamType; |
| QualType ArgType = Arg->getType(); |
| if (ParamType->isIntegralOrEnumerationType()) { |
| // C++ [temp.arg.nontype]p1: |
| // A template-argument for a non-type, non-template |
| // template-parameter shall be one of: |
| // |
| // -- an integral constant-expression of integral or enumeration |
| // type; or |
| // -- the name of a non-type template-parameter; or |
| SourceLocation NonConstantLoc; |
| llvm::APSInt Value; |
| if (!ArgType->isIntegralOrEnumerationType()) { |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_integral_or_enumeral) |
| << ArgType << Arg->getSourceRange(); |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return ExprError(); |
| } else if (!Arg->isValueDependent() && |
| !Arg->isIntegerConstantExpr(Value, Context, &NonConstantLoc)) { |
| Diag(NonConstantLoc, diag::err_template_arg_not_ice) |
| << ArgType << Arg->getSourceRange(); |
| return ExprError(); |
| } |
| |
| // From here on out, all we care about are the unqualified forms |
| // of the parameter and argument types. |
| ParamType = ParamType.getUnqualifiedType(); |
| ArgType = ArgType.getUnqualifiedType(); |
| |
| // Try to convert the argument to the parameter's type. |
| if (Context.hasSameType(ParamType, ArgType)) { |
| // Okay: no conversion necessary |
| } else if (CTAK == CTAK_Deduced) { |
| // C++ [temp.deduct.type]p17: |
| // If, in the declaration of a function template with a non-type |
| // template-parameter, the non-type template- parameter is used |
| // in an expression in the function parameter-list and, if the |
| // corresponding template-argument is deduced, the |
| // template-argument type shall match the type of the |
| // template-parameter exactly, except that a template-argument |
| // deduced from an array bound may be of any integral type. |
| Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch) |
| << ArgType << ParamType; |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return ExprError(); |
| } else if (ParamType->isBooleanType()) { |
| // This is an integral-to-boolean conversion. |
| Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).take(); |
| } else if (IsIntegralPromotion(Arg, ArgType, ParamType) || |
| !ParamType->isEnumeralType()) { |
| // This is an integral promotion or conversion. |
| Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).take(); |
| } else { |
| // We can't perform this conversion. |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_convertible) |
| << Arg->getType() << InstantiatedParamType << Arg->getSourceRange(); |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return ExprError(); |
| } |
| |
| // Add the value of this argument to the list of converted |
| // arguments. We use the bitwidth and signedness of the template |
| // parameter. |
| if (Arg->isValueDependent()) { |
| // The argument is value-dependent. Create a new |
| // TemplateArgument with the converted expression. |
| Converted = TemplateArgument(Arg); |
| return Owned(Arg); |
| } |
| |
| QualType IntegerType = Context.getCanonicalType(ParamType); |
| if (const EnumType *Enum = IntegerType->getAs<EnumType>()) |
| IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType()); |
| |
| if (ParamType->isBooleanType()) { |
| // Value must be zero or one. |
| Value = Value != 0; |
| unsigned AllowedBits = Context.getTypeSize(IntegerType); |
| if (Value.getBitWidth() != AllowedBits) |
| Value = Value.extOrTrunc(AllowedBits); |
| Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); |
| } else { |
| llvm::APSInt OldValue = Value; |
| |
| // Coerce the template argument's value to the value it will have |
| // based on the template parameter's type. |
| unsigned AllowedBits = Context.getTypeSize(IntegerType); |
| if (Value.getBitWidth() != AllowedBits) |
| Value = Value.extOrTrunc(AllowedBits); |
| Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); |
| |
| // Complain if an unsigned parameter received a negative value. |
| if (IntegerType->isUnsignedIntegerOrEnumerationType() |
| && (OldValue.isSigned() && OldValue.isNegative())) { |
| Diag(Arg->getSourceRange().getBegin(), diag::warn_template_arg_negative) |
| << OldValue.toString(10) << Value.toString(10) << Param->getType() |
| << Arg->getSourceRange(); |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| } |
| |
| // Complain if we overflowed the template parameter's type. |
| unsigned RequiredBits; |
| if (IntegerType->isUnsignedIntegerOrEnumerationType()) |
| RequiredBits = OldValue.getActiveBits(); |
| else if (OldValue.isUnsigned()) |
| RequiredBits = OldValue.getActiveBits() + 1; |
| else |
| RequiredBits = OldValue.getMinSignedBits(); |
| if (RequiredBits > AllowedBits) { |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::warn_template_arg_too_large) |
| << OldValue.toString(10) << Value.toString(10) << Param->getType() |
| << Arg->getSourceRange(); |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| } |
| } |
| |
| Converted = TemplateArgument(Value, |
| ParamType->isEnumeralType() ? ParamType |
| : IntegerType); |
| return Owned(Arg); |
| } |
| |
| DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction |
| |
| // C++0x [temp.arg.nontype]p5 bullets 2, 4 and 6 permit conversion |
| // from a template argument of type std::nullptr_t to a non-type |
| // template parameter of type pointer to object, pointer to |
| // function, or pointer-to-member, respectively. |
| if (ArgType->isNullPtrType()) { |
| if (ParamType->isPointerType() || ParamType->isMemberPointerType()) { |
| Converted = TemplateArgument((NamedDecl *)0); |
| return Owned(Arg); |
| } |
| |
| if (ParamType->isNullPtrType()) { |
| llvm::APSInt Zero(Context.getTypeSize(Context.NullPtrTy), true); |
| Converted = TemplateArgument(Zero, Context.NullPtrTy); |
| return Owned(Arg); |
| } |
| } |
| |
| // Handle pointer-to-function, reference-to-function, and |
| // pointer-to-member-function all in (roughly) the same way. |
| if (// -- For a non-type template-parameter of type pointer to |
| // function, only the function-to-pointer conversion (4.3) is |
| // applied. If the template-argument represents a set of |
| // overloaded functions (or a pointer to such), the matching |
| // function is selected from the set (13.4). |
| (ParamType->isPointerType() && |
| ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) || |
| // -- For a non-type template-parameter of type reference to |
| // function, no conversions apply. If the template-argument |
| // represents a set of overloaded functions, the matching |
| // function is selected from the set (13.4). |
| (ParamType->isReferenceType() && |
| ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) || |
| // -- For a non-type template-parameter of type pointer to |
| // member function, no conversions apply. If the |
| // template-argument represents a set of overloaded member |
| // functions, the matching member function is selected from |
| // the set (13.4). |
| (ParamType->isMemberPointerType() && |
| ParamType->getAs<MemberPointerType>()->getPointeeType() |
| ->isFunctionType())) { |
| |
| if (Arg->getType() == Context.OverloadTy) { |
| if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType, |
| true, |
| FoundResult)) { |
| if (DiagnoseUseOfDecl(Fn, Arg->getSourceRange().getBegin())) |
| return ExprError(); |
| |
| Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); |
| ArgType = Arg->getType(); |
| } else |
| return ExprError(); |
| } |
| |
| if (!ParamType->isMemberPointerType()) { |
| if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, |
| ParamType, |
| Arg, Converted)) |
| return ExprError(); |
| return Owned(Arg); |
| } |
| |
| if (IsQualificationConversion(ArgType, ParamType.getNonReferenceType(), |
| false)) { |
| Arg = ImpCastExprToType(Arg, ParamType, CK_NoOp, CastCategory(Arg)).take(); |
| } else if (!Context.hasSameUnqualifiedType(ArgType, |
| ParamType.getNonReferenceType())) { |
| // We can't perform this conversion. |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_convertible) |
| << Arg->getType() << InstantiatedParamType << Arg->getSourceRange(); |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return ExprError(); |
| } |
| |
| if (CheckTemplateArgumentPointerToMember(Arg, Converted)) |
| return ExprError(); |
| return Owned(Arg); |
| } |
| |
| if (ParamType->isPointerType()) { |
| // -- for a non-type template-parameter of type pointer to |
| // object, qualification conversions (4.4) and the |
| // array-to-pointer conversion (4.2) are applied. |
| // C++0x also allows a value of std::nullptr_t. |
| assert(ParamType->getPointeeType()->isIncompleteOrObjectType() && |
| "Only object pointers allowed here"); |
| |
| if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, |
| ParamType, |
| Arg, Converted)) |
| return ExprError(); |
| return Owned(Arg); |
| } |
| |
| if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) { |
| // -- For a non-type template-parameter of type reference to |
| // object, no conversions apply. The type referred to by the |
| // reference may be more cv-qualified than the (otherwise |
| // identical) type of the template-argument. The |
| // template-parameter is bound directly to the |
| // template-argument, which must be an lvalue. |
| assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() && |
| "Only object references allowed here"); |
| |
| if (Arg->getType() == Context.OverloadTy) { |
| if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, |
| ParamRefType->getPointeeType(), |
| true, |
| FoundResult)) { |
| if (DiagnoseUseOfDecl(Fn, Arg->getSourceRange().getBegin())) |
| return ExprError(); |
| |
| Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); |
| ArgType = Arg->getType(); |
| } else |
| return ExprError(); |
| } |
| |
| if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, |
| ParamType, |
| Arg, Converted)) |
| return ExprError(); |
| return Owned(Arg); |
| } |
| |
| // -- For a non-type template-parameter of type pointer to data |
| // member, qualification conversions (4.4) are applied. |
| assert(ParamType->isMemberPointerType() && "Only pointers to members remain"); |
| |
| if (Context.hasSameUnqualifiedType(ParamType, ArgType)) { |
| // Types match exactly: nothing more to do here. |
| } else if (IsQualificationConversion(ArgType, ParamType, false)) { |
| Arg = ImpCastExprToType(Arg, ParamType, CK_NoOp, CastCategory(Arg)).take(); |
| } else { |
| // We can't perform this conversion. |
| Diag(Arg->getSourceRange().getBegin(), |
| diag::err_template_arg_not_convertible) |
| << Arg->getType() << InstantiatedParamType << Arg->getSourceRange(); |
| Diag(Param->getLocation(), diag::note_template_param_here); |
| return ExprError(); |
| } |
| |
| if (CheckTemplateArgumentPointerToMember(Arg, Converted)) |
| return ExprError(); |
| return Owned(Arg); |
| } |
| |
| /// \brief Check a template argument against its corresponding |
| /// template template parameter. |
| /// |
| /// This routine implements the semantics of C++ [temp.arg.template]. |
| /// It returns true if an error occurred, and false otherwise. |
| bool Sema::CheckTemplateArgument(TemplateTemplateParmDecl *Param, |
| const TemplateArgumentLoc &Arg) { |
| TemplateName Name = Arg.getArgument().getAsTemplate(); |
| TemplateDecl *Template = Name.getAsTemplateDecl(); |
| if (!Template) { |
| // Any dependent template name is fine. |
| assert(Name.isDependent() && "Non-dependent template isn't a declaration?"); |
| return false; |
| } |
| |
| // C++0x [temp.arg.template]p1: |
| // A template-argument for a template template-parameter shall be |
| // the name of a class template or an alias template, expressed as an |
| // id-expression. When the template-argument names a class template, only |
| // primary class templates are considered when matching the |
| // template template argument with the corresponding parameter; |
| // partial specializations are not considered even if their |
| // parameter lists match that of the template template parameter. |
| // |
| // Note that we also allow template template parameters here, which |
| // will happen when we are dealing with, e.g., class template |
| // partial specializations. |
| if (!isa<ClassTemplateDecl>(Template) && |
| !isa<TemplateTemplateParmDecl>(Template) && |
| !isa<TypeAliasTemplateDecl>(Template)) { |
| assert(isa<FunctionTemplateDecl>(Template) && |
| "Only function templates are possible here"); |
| Diag(Arg.getLocation(), diag::err_template_arg_not_class_template); |
| Diag(Template->getLocation(), diag::note_template_arg_refers_here_func) |
| << Template; |
| } |
| |
| return !TemplateParameterListsAreEqual(Template->getTemplateParameters(), |
| Param->getTemplateParameters(), |
| true, |
| TPL_TemplateTemplateArgumentMatch, |
| Arg.getLocation()); |
| } |
| |
| /// \brief Given a non-type template argument that refers to a |
| /// declaration and the type of its corresponding non-type template |
| /// parameter, produce an expression that properly refers to that |
| /// declaration. |
| ExprResult |
| Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg, |
| QualType ParamType, |
| SourceLocation Loc) { |
| assert(Arg.getKind() == TemplateArgument::Declaration && |
| "Only declaration template arguments permitted here"); |
| ValueDecl *VD = cast<ValueDecl>(Arg.getAsDecl()); |
| |
| 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 (ParamType->isMemberPointerType()) { |
| QualType ClassType |
| = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext())); |
| NestedNameSpecifier *Qualifier |
| = NestedNameSpecifier::Create(Context, 0, false, |
| ClassType.getTypePtr()); |
| CXXScopeSpec SS; |
| SS.MakeTrivial(Context, Qualifier, Loc); |
| |
| // The actual value-ness of this is unimportant, but for |
| // internal consistency's sake, references to instance methods |
| // are r-values. |
| ExprValueKind VK = VK_LValue; |
| if (isa<CXXMethodDecl>(VD) && cast<CXXMethodDecl>(VD)->isInstance()) |
| VK = VK_RValue; |
| |
| ExprResult RefExpr = BuildDeclRefExpr(VD, |
| VD->getType().getNonReferenceType(), |
| VK, |
| Loc, |
| &SS); |
| if (RefExpr.isInvalid()) |
| return ExprError(); |
| |
| RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get()); |
| |
| // We might need to perform a trailing qualification conversion, since |
| // the element type on the parameter could be more qualified than the |
| // element type in the expression we constructed. |
| if (IsQualificationConversion(((Expr*) RefExpr.get())->getType(), |
| ParamType.getUnqualifiedType(), false)) |
| RefExpr = ImpCastExprToType(RefExpr.take(), ParamType.getUnqualifiedType(), CK_NoOp); |
| |
| assert(!RefExpr.isInvalid() && |
| Context.hasSameType(((Expr*) RefExpr.get())->getType(), |
| ParamType.getUnqualifiedType())); |
| return move(RefExpr); |
| } |
| } |
| |
| QualType T = VD->getType().getNonReferenceType(); |
| if (ParamType->isPointerType()) { |
| // When the non-type template parameter is a pointer, take the |
| // address of the declaration. |
| ExprResult RefExpr = BuildDeclRefExpr(VD, T, VK_LValue, Loc); |
| if (RefExpr.isInvalid()) |
| return ExprError(); |
| |
| if (T->isFunctionType() || T->isArrayType()) { |
| // Decay functions and arrays. |
| RefExpr = DefaultFunctionArrayConversion(RefExpr.take()); |
| if (RefExpr.isInvalid()) |
| return ExprError(); |
| |
| return move(RefExpr); |
| } |
| |
| // Take the address of everything else |
| return CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get()); |
| } |
| |
| ExprValueKind VK = VK_RValue; |
| |
| // 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 = ParamType->getAs<ReferenceType>()) { |
| VK = VK_LValue; |
| T = Context.getQualifiedType(T, |
| TargetRef->getPointeeType().getQualifiers()); |
| } |
| |
| return BuildDeclRefExpr(VD, T, VK, Loc); |
| } |
| |
| /// \brief Construct a new expression that refers to the given |
| /// integral template argument with the given source-location |
| /// information. |
| /// |
| /// This routine takes care of the mapping from an integral template |
| /// argument (which may have any integral type) to the appropriate |
| /// literal value. |
| ExprResult |
| Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg, |
| SourceLocation Loc) { |
| assert(Arg.getKind() == TemplateArgument::Integral && |
| "Operation is only valid for integral template arguments"); |
| QualType T = Arg.getIntegralType(); |
| if (T->isCharType() || T->isWideCharType()) |
| return Owned(new (Context) CharacterLiteral( |
| Arg.getAsIntegral()->getZExtValue(), |
| T->isWideCharType(), T, Loc)); |
| if (T->isBooleanType()) |
| return Owned(new (Context) CXXBoolLiteralExpr( |
| Arg.getAsIntegral()->getBoolValue(), |
| T, Loc)); |
| |
| if (T->isNullPtrType()) |
| return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc)); |
| |
| // If this is an enum type that we're instantiating, we need to use an integer |
| // type the same size as the enumerator. We don't want to build an |
| // IntegerLiteral with enum type. |
| QualType BT; |
| if (const EnumType *ET = T->getAs<EnumType>()) |
| BT = ET->getDecl()->getIntegerType(); |
| else |
| BT = T; |
| |
| Expr *E = IntegerLiteral::Create(Context, *Arg.getAsIntegral(), BT, Loc); |
| if (T->isEnumeralType()) { |
| // FIXME: This is a hack. We need a better way to handle substituted |
| // non-type template parameters. |
| E = CStyleCastExpr::Create(Context, T, VK_RValue, CK_IntegralCast, E, 0, |
| Context.getTrivialTypeSourceInfo(T, Loc), |
| Loc, Loc); |
| } |
| |
| return Owned(E); |
| } |
| |
| /// \brief Match two template parameters within template parameter lists. |
| static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old, |
| bool Complain, |
| Sema::TemplateParameterListEqualKind Kind, |
| SourceLocation TemplateArgLoc) { |
| // Check the actual kind (type, non-type, template). |
| if (Old->getKind() != New->getKind()) { |
| if (Complain) { |
| unsigned NextDiag = diag::err_template_param_different_kind; |
| if (TemplateArgLoc.isValid()) { |
| S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); |
| NextDiag = diag::note_template_param_different_kind; |
| } |
| S.Diag(New->getLocation(), NextDiag) |
| << (Kind != Sema::TPL_TemplateMatch); |
| S.Diag(Old->getLocation(), diag::note_template_prev_declaration) |
| << (Kind != Sema::TPL_TemplateMatch); |
| } |
| |
| return false; |
| } |
| |
| // Check that both are parameter packs are neither are parameter packs. |
| // However, if we are matching a template template argument to a |
| // template template parameter, the template template parameter can have |
| // a parameter pack where the template template argument does not. |
| if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() && |
| !(Kind == Sema::TPL_TemplateTemplateArgumentMatch && |
| Old->isTemplateParameterPack())) { |
| if (Complain) { |
| unsigned NextDiag = diag::err_template_parameter_pack_non_pack; |
| if (TemplateArgLoc.isValid()) { |
| S.Diag(TemplateArgLoc, |
| diag::err_template_arg_template_params_mismatch); |
| NextDiag = diag::note_template_parameter_pack_non_pack; |
| } |
| |
| unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0 |
| : isa<NonTypeTemplateParmDecl>(New)? 1 |
| : 2; |
| S.Diag(New->getLocation(), NextDiag) |
| << ParamKind << New->isParameterPack(); |
| S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here) |
| << ParamKind << Old->isParameterPack(); |
| } |
| |
| return false; |
| } |
| |
| // For non-type template parameters, check the type of the parameter. |
| if (NonTypeTemplateParmDecl *OldNTTP |
| = dyn_cast<NonTypeTemplateParmDecl>(Old)) { |
| NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New); |
| |
| // If we are matching a template template argument to a template |
| // template parameter and one of the non-type template parameter types |
| // is dependent, then we must wait until template instantiation time |
| // to actually compare the arguments. |
| if (Kind == Sema::TPL_TemplateTemplateArgumentMatch && |
| (OldNTTP->getType()->isDependentType() || |
| NewNTTP->getType()->isDependentType())) |
| return true; |
| |
| if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) { |
| if (Complain) { |
| unsigned NextDiag = diag::err_template_nontype_parm_different_type; |
| if (TemplateArgLoc.isValid()) { |
| S.Diag(TemplateArgLoc, |
| diag::err_template_arg_template_params_mismatch); |
| NextDiag = diag::note_template_nontype_parm_different_type; |
| } |
| S.Diag(NewNTTP->getLocation(), NextDiag) |
| << NewNTTP->getType() |
| << (Kind != Sema::TPL_TemplateMatch); |
| S.Diag(OldNTTP->getLocation(), |
| diag::note_template_nontype_parm_prev_declaration) |
| << OldNTTP->getType(); |
| } |
| |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // For template template parameters, check the template parameter types. |
| // The template parameter lists of template template |
| // parameters must agree. |
| if (TemplateTemplateParmDecl *OldTTP |
| = dyn_cast<TemplateTemplateParmDecl>(Old)) { |
| TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New); |
| return S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(), |
| OldTTP->getTemplateParameters(), |
| Complain, |
| (Kind == Sema::TPL_TemplateMatch |
| ? Sema::TPL_TemplateTemplateParmMatch |
| : Kind), |
| TemplateArgLoc); |
| } |
| |
| return true; |
| } |
| |
| /// \brief Diagnose a known arity mismatch when comparing template argument |
| /// lists. |
| static |
| void DiagnoseTemplateParameterListArityMismatch(Sema &S, |
| TemplateParameterList *New, |
| TemplateParameterList *Old, |
| Sema::TemplateParameterListEqualKind Kind, |
| SourceLocation TemplateArgLoc) { |
| unsigned NextDiag = diag::err_template_param_list_different_arity; |
| if (TemplateArgLoc.isValid()) { |
| S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); |
| NextDiag = diag::note_template_param_list_different_arity; |
| } |
| S.Diag(New->getTemplateLoc(), NextDiag) |
| << (New->size() > Old->size()) |
| << (Kind != Sema::TPL_TemplateMatch) |
| << SourceRange(New->getTemplateLoc(), New->getRAngleLoc()); |
| S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration) |
| << (Kind != Sema::TPL_TemplateMatch) |
| << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc()); |
| } |
| |
| /// \brief Determine whether the given template parameter lists are |
| /// equivalent. |
| /// |
| /// \param New The new template parameter list, typically written in the |
| /// source code as part of a new template declaration. |
| /// |
| /// \param Old The old template parameter list, typically found via |
| /// name lookup of the template declared with this template parameter |
| /// list. |
| /// |
| /// \param Complain If true, this routine will produce a diagnostic if |
| /// the template parameter lists are not equivalent. |
| /// |
| /// \param Kind describes how we are to match the template parameter lists. |
| /// |
| /// \param TemplateArgLoc If this source location is valid, then we |
| /// are actually checking the template parameter list of a template |
| /// argument (New) against the template parameter list of its |
| /// corresponding template template parameter (Old). We produce |
| /// slightly different diagnostics in this scenario. |
| /// |
| /// \returns True if the template parameter lists are equal, false |
| /// otherwise. |
| bool |
| Sema::TemplateParameterListsAreEqual(TemplateParameterList *New, |
| TemplateParameterList *Old, |
| bool Complain, |
| TemplateParameterListEqualKind Kind, |
| SourceLocation TemplateArgLoc) { |
| if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) { |
| if (Complain) |
| DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
| TemplateArgLoc); |
| |
| return false; |
| } |
| |
| // C++0x [temp.arg.template]p3: |
| // A template-argument matches a template template-parameter (call it P) |
| // when each of the template parameters in the template-parameter-list of |
| // the template-argument's corresponding class template or alias template |
| // (call it A) matches the corresponding template parameter in the |
| // template-parameter-list of P. [...] |
| TemplateParameterList::iterator NewParm = New->begin(); |
| TemplateParameterList::iterator NewParmEnd = New->end(); |
| for (TemplateParameterList::iterator OldParm = Old->begin(), |
| OldParmEnd = Old->end(); |
| OldParm != OldParmEnd; ++OldParm) { |
| if (Kind != TPL_TemplateTemplateArgumentMatch || |
| !(*OldParm)->isTemplateParameterPack()) { |
| if (NewParm == NewParmEnd) { |
| if (Complain) |
| DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
| TemplateArgLoc); |
| |
| return false; |
| } |
| |
| if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain, |
| Kind, TemplateArgLoc)) |
| return false; |
| |
| ++NewParm; |
| continue; |
| } |
| |
| // C++0x [temp.arg.template]p3: |
| // [...] When P's template- parameter-list contains a template parameter |
| // pack (14.5.3), the template parameter pack will match zero or more |
| // template parameters or template parameter packs in the |
| // template-parameter-list of A with the same type and form as the |
| // template parameter pack in P (ignoring whether those template |
| // parameters are template parameter packs). |
| for (; NewParm != NewParmEnd; ++NewParm) { |
| if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain, |
| Kind, TemplateArgLoc)) |
| return false; |
| } |
| } |
| |
| // Make sure we exhausted all of the arguments. |
| if (NewParm != NewParmEnd) { |
| if (Complain) |
| DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
| TemplateArgLoc); |
| |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /// \brief Check whether a template can be declared within this scope. |
| /// |
| /// If the template declaration is valid in this scope, returns |
| /// false. Otherwise, issues a diagnostic and returns true. |
| bool |
| Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) { |
| // Find the nearest enclosing declaration scope. |
| while ((S->getFlags() & Scope::DeclScope) == 0 || |
| (S->getFlags() & Scope::TemplateParamScope) != 0) |
| S = S->getParent(); |
| |
| // C++ [temp]p2: |
| // A template-declaration can appear only as a namespace scope or |
| // class scope declaration. |
| DeclContext *Ctx = static_cast<DeclContext *>(S->getEntity()); |
| if (Ctx && isa<LinkageSpecDecl>(Ctx) && |
| cast<LinkageSpecDecl>(Ctx)->getLanguage() != LinkageSpecDecl::lang_cxx) |
| return Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage) |
| << TemplateParams->getSourceRange(); |
| |
| while (Ctx && isa<LinkageSpecDecl>(Ctx)) |
| Ctx = Ctx->getParent(); |
| |
| if (Ctx && (Ctx->isFileContext() || Ctx->isRecord())) |
| return false; |
| |
| return Diag(TemplateParams->getTemplateLoc(), |
| diag::err_template_outside_namespace_or_class_scope) |
| << TemplateParams->getSourceRange(); |
| } |
| |
| /// \brief Determine what kind of template specialization the given declaration |
| /// is. |
| static TemplateSpecializationKind getTemplateSpecializationKind(NamedDecl *D) { |
| if (!D) |
| return TSK_Undeclared; |
| |
| if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) |
| return Record->getTemplateSpecializationKind(); |
| if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) |
| return Function->getTemplateSpecializationKind(); |
| if (VarDecl *Var = dyn_cast<VarDecl>(D)) |
| return Var->getTemplateSpecializationKind(); |
| |
| return TSK_Undeclared; |
| } |
| |
| /// \brief Check whether a specialization is well-formed in the current |
| /// context. |
| /// |
| /// This routine determines whether a template specialization can be declared |
| /// in the current context (C++ [temp.expl.spec]p2). |
| /// |
| /// \param S the semantic analysis object for which this check is being |
| /// performed. |
| /// |
| /// \param Specialized the entity being specialized or instantiated, which |
| /// may be a kind of template (class template, function template, etc.) or |
| /// a member of a class template (member function, static data member, |
| /// member class). |
| /// |
| /// \param PrevDecl the previous declaration of this entity, if any. |
| /// |
| /// \param Loc the location of the explicit specialization or instantiation of |
| /// this entity. |
| /// |
| /// \param IsPartialSpecialization whether this is a partial specialization of |
| /// a class template. |
| /// |
| /// \returns true if there was an error that we cannot recover from, false |
| /// otherwise. |
| static bool CheckTemplateSpecializationScope(Sema &S, |
| NamedDecl *Specialized, |
| NamedDecl *PrevDecl, |
| SourceLocation Loc, |
| bool IsPartialSpecialization) { |
| // Keep these "kind" numbers in sync with the %select statements in the |
| // various diagnostics emitted by this routine. |
| int EntityKind = 0; |
| if (isa<ClassTemplateDecl>(Specialized)) |
| EntityKind = IsPartialSpecialization? 1 : 0; |
| else if (isa<FunctionTemplateDecl>(Specialized)) |
| EntityKind = 2; |
| else if (isa<CXXMethodDecl>(Specialized)) |
| EntityKind = 3; |
| else if (isa<VarDecl>(Specialized)) |
| EntityKind = 4; |
| else if (isa<RecordDecl>(Specialized)) |
| EntityKind = 5; |
| else { |
| S.Diag(Loc, diag::err_template_spec_unknown_kind); |
| S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
| return true; |
| } |
| |
| // C++ [temp.expl.spec]p2: |
| // An explicit specialization shall be declared in the namespace |
| // of which the template is a member, or, for member templates, in |
| // the namespace of which the enclosing class or enclosing class |
| // template is a member. An explicit specialization of a member |
| // function, member class or static data member of a class |
| // template shall be declared in the namespace of which the class |
| // template is a member. Such a declaration may also be a |
| // definition. If the declaration is not a definition, the |
| // specialization may be defined later in the name- space in which |
| // the explicit specialization was declared, or in a namespace |
| // that encloses the one in which the explicit specialization was |
| // declared. |
| if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) { |
| S.Diag(Loc, diag::err_template_spec_decl_function_scope) |
| << Specialized; |
| return true; |
| } |
| |
| if (S.CurContext->isRecord() && !IsPartialSpecialization) { |
| S.Diag(Loc, diag::err_template_spec_decl_class_scope) |
| << Specialized; |
| return true; |
| } |
| |
| // C++ [temp.class.spec]p6: |
| // A class template partial specialization may be declared or redeclared |
| // in any namespace scope in which its definition may be defined (14.5.1 |
| // and 14.5.2). |
| bool ComplainedAboutScope = false; |
| DeclContext *SpecializedContext |
| = Specialized->getDeclContext()->getEnclosingNamespaceContext(); |
| DeclContext *DC = S.CurContext->getEnclosingNamespaceContext(); |
| if ((!PrevDecl || |
| getTemplateSpecializationKind(PrevDecl) == TSK_Undeclared || |
| getTemplateSpecializationKind(PrevDecl) == TSK_ImplicitInstantiation)){ |
| // C++ [temp.exp.spec]p2: |
| // An explicit specialization shall be declared in the namespace of which |
| // the template is a member, or, for member templates, in the namespace |
| // of which the enclosing class or enclosing class template is a member. |
| // An explicit specialization of a member function, member class or |
| // static data member of a class template shall be declared in the |
| // namespace of which the class template is a member. |
| // |
| // C++0x [temp.expl.spec]p2: |
| // An explicit specialization shall be declared in a namespace enclosing |
| // the specialized template. |
| if (!DC->InEnclosingNamespaceSetOf(SpecializedContext) && |
| !(S.getLangOptions().CPlusPlus0x && DC->Encloses(SpecializedContext))) { |
| bool IsCPlusPlus0xExtension |
| = !S.getLangOptions().CPlusPlus0x && DC->Encloses(SpecializedContext); |
| if (isa<TranslationUnitDecl>(SpecializedContext)) |
| S.Diag(Loc, IsCPlusPlus0xExtension |
| ? diag::ext_template_spec_decl_out_of_scope_global |
| : diag::err_template_spec_decl_out_of_scope_global) |
| << EntityKind << Specialized; |
| else if (isa<NamespaceDecl>(SpecializedContext)) |
| S.Diag(Loc, IsCPlusPlus0xExtension |
| ? diag::ext_template_spec_decl_out_of_scope |
| : diag::err_template_spec_decl_out_of_scope) |
| << EntityKind << Specialized |
| << cast<NamedDecl>(SpecializedContext); |
| |
| S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
| ComplainedAboutScope = true; |
| } |
| } |
| |
| // Make sure that this redeclaration (or definition) occurs in an enclosing |
| // namespace. |
| // Note that HandleDeclarator() performs this check for explicit |
| // specializations of function templates, static data members, and member |
| // functions, so we skip the check here for those kinds of entities. |
| // FIXME: HandleDeclarator's diagnostics aren't quite as good, though. |
| // Should we refactor that check, so that it occurs later? |
| if (!ComplainedAboutScope && !DC->Encloses(SpecializedContext) && |
| !(isa<FunctionTemplateDecl>(Specialized) || isa<VarDecl>(Specialized) || |
| isa<FunctionDecl>(Specialized))) { |
| if (isa<TranslationUnitDecl>(SpecializedContext)) |
| S.Diag(Loc, diag::err_template_spec_redecl_global_scope) |
| << EntityKind << Specialized; |
| else if (isa<NamespaceDecl>(SpecializedContext)) |
| S.Diag(Loc, diag::err_template_spec_redecl_out_of_scope) |
| << EntityKind << Specialized |
| << cast<NamedDecl>(SpecializedContext); |
| |
| S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
| } |
| |
| // FIXME: check for specialization-after-instantiation errors and such. |
| |
| return false; |
| } |
| |
| /// \brief Subroutine of Sema::CheckClassTemplatePartialSpecializationArgs |
| /// that checks non-type template partial specialization arguments. |
| static bool CheckNonTypeClassTemplatePartialSpecializationArgs(Sema &S, |
| NonTypeTemplateParmDecl *Param, |
| const TemplateArgument *Args, |
| unsigned NumArgs) { |
| for (unsigned I = 0; I != NumArgs; ++I) { |
| if (Args[I].getKind() == TemplateArgument::Pack) { |
| if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param, |
| Args[I].pack_begin(), |
| Args[I].pack_size())) |
| return true; |
| |
| continue; |
| } |
| |
| Expr *ArgExpr = Args[I].getAsExpr(); |
| if (!ArgExpr) { |
| continue; |
| } |
| |
| // We can have a pack expansion of any of the bullets below. |
| if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr)) |
| ArgExpr = Expansion->getPattern(); |
| |
| // Strip off any implicit casts we added as part of type checking. |
| while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) |
| ArgExpr = ICE->getSubExpr(); |
| |
| // C++ [temp.class.spec]p8: |
| // A non-type argument is non-specialized if it is the name of a |
| // non-type parameter. All other non-type arguments are |
| // specialized. |
| // |
| // Below, we check the two conditions that only apply to |
| // specialized non-type arguments, so skip any non-specialized |
| // arguments. |
| if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr)) |
| if (isa<NonTypeTemplateParmDecl>(DRE->getDecl())) |
| continue; |
| |
| // C++ [temp.class.spec]p9: |
| // Within the argument list of a class template partial |
| // specialization, the following restrictions apply: |
| // -- A partially specialized non-type argument expression |
| // shall not involve a template parameter of the partial |
| // specialization except when the argument expression is a |
| // simple identifier. |
| if (ArgExpr->isTypeDependent() || ArgExpr->isValueDependent()) { |
| S.Diag(ArgExpr->getLocStart(), |
| diag::err_dependent_non_type_arg_in_partial_spec) |
| << ArgExpr->getSourceRange(); |
| return true; |
| } |
| |
| // -- The type of a template parameter corresponding to a |
| // specialized non-type argument shall not be dependent on a |
| // parameter of the specialization. |
| if (Param->getType()->isDependentType()) { |
| S.Diag(ArgExpr->getLocStart(), |
| diag::err_dependent_typed_non_type_arg_in_partial_spec) |
| << Param->getType() |
| << ArgExpr->getSourceRange(); |
| S.Diag(Param->getLocation(), diag::note_template_param_here); |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /// \brief Check the non-type template arguments of a class template |
| /// partial specialization according to C++ [temp.class.spec]p9. |
| /// |
| /// \param TemplateParams the template parameters of the primary class |
| /// template. |
| /// |
| /// \param TemplateArg the template arguments of the class template |
| /// partial specialization. |
| /// |
| /// \returns true if there was an error, false otherwise. |
| static bool CheckClassTemplatePartialSpecializationArgs(Sema &S, |
| TemplateParameterList *TemplateParams, |
| llvm::SmallVectorImpl<TemplateArgument> &TemplateArgs) { |
| const TemplateArgument *ArgList = TemplateArgs.data(); |
| |
| for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
| NonTypeTemplateParmDecl *Param |
| = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I)); |
| if (!Param) |
| continue; |
| |
| if (CheckNonTypeClassTemplatePartialSpecializationArgs(S, Param, |
| &ArgList[I], 1)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /// \brief Retrieve the previous declaration of the given declaration. |
| static NamedDecl *getPreviousDecl(NamedDecl *ND) { |
| if (VarDecl *VD = dyn_cast<VarDecl>(ND)) |
| return VD->getPreviousDeclaration(); |
| if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) |
| return FD->getPreviousDeclaration(); |
| if (TagDecl *TD = dyn_cast<TagDecl>(ND)) |
| return TD->getPreviousDeclaration(); |
| if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(ND)) |
| return TD->getPreviousDeclaration(); |
| if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) |
| return FTD->getPreviousDeclaration(); |
| if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(ND)) |
| return CTD->getPreviousDeclaration(); |
| return 0; |
| } |
| |
| DeclResult |
| Sema::ActOnClassTemplateSpecialization(Scope *S, unsigned TagSpec, |
| TagUseKind TUK, |
| SourceLocation KWLoc, |
| CXXScopeSpec &SS, |
| TemplateTy TemplateD, |
| SourceLocation TemplateNameLoc, |
| SourceLocation LAngleLoc, |
| ASTTemplateArgsPtr TemplateArgsIn, |
| SourceLocation RAngleLoc, |
| AttributeList *Attr, |
| MultiTemplateParamsArg TemplateParameterLists) { |
| assert(TUK != TUK_Reference && "References are not specializations"); |
| |
| // NOTE: KWLoc is the location of the tag keyword. This will instead |
| // store the location of the outermost template keyword in the declaration. |
| SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0 |
| ? TemplateParameterLists.get()[0]->getTemplateLoc() : SourceLocation(); |
| |
| // Find the class template we're specializing |
| TemplateName Name = TemplateD.getAsVal<TemplateName>(); |
| ClassTemplateDecl *ClassTemplate |
| = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl()); |
| |
| if (!ClassTemplate) { |
| Diag(TemplateNameLoc, diag::err_not_class_template_specialization) |
| << (Name.getAsTemplateDecl() && |
| isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())); |
| return true; |
| } |
| |
| bool isExplicitSpecialization = false; |
| bool isPartialSpecialization = false; |
| |
| // Check the validity of the template headers that introduce this |
| // template. |
| // FIXME: We probably shouldn't complain about these headers for |
| // friend declarations. |
| bool Invalid = false; |
| TemplateParameterList *TemplateParams |
| = MatchTemplateParametersToScopeSpecifier(TemplateNameLoc, |
| TemplateNameLoc, |
| SS, |
| (TemplateParameterList**)TemplateParameterLists.get(), |
| TemplateParameterLists.size(), |
| TUK == TUK_Friend, |
| isExplicitSpecialization, |
| Invalid); |
| if (Invalid) |
| return true; |
| |
| if (TemplateParams && TemplateParams->size() > 0) { |
| isPartialSpecialization = true; |
| |
| if (TUK == TUK_Friend) { |
| Diag(KWLoc, diag::err_partial_specialization_friend) |
| << SourceRange(LAngleLoc, RAngleLoc); |
| return true; |
| } |
| |
| // C++ [temp.class.spec]p10: |
| // The template parameter list of a specialization shall not |
| // contain default template argument values. |
| for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
| Decl *Param = TemplateParams->getParam(I); |
| if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) { |
| if (TTP->hasDefaultArgument()) { |
| Diag(TTP->getDefaultArgumentLoc(), |
| diag::err_default_arg_in_partial_spec); |
| TTP->removeDefaultArgument(); |
| } |
| } else if (NonTypeTemplateParmDecl *NTTP |
| = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
| if (Expr *DefArg = NTTP->getDefaultArgument()) { |
| Diag(NTTP->getDefaultArgumentLoc(), |
| diag::err_default_arg_in_partial_spec) |
| << DefArg->getSourceRange(); |
| NTTP->removeDefaultArgument(); |
| } |
| } else { |
| TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param); |
| if (TTP->hasDefaultArgument()) { |
| Diag(TTP->getDefaultArgument().getLocation(), |
| diag::err_default_arg_in_partial_spec) |
| << TTP->getDefaultArgument().getSourceRange(); |
| TTP->removeDefaultArgument(); |
| } |
| } |
| } |
| } else if (TemplateParams) { |
| if (TUK == TUK_Friend) |
| Diag(KWLoc, diag::err_template_spec_friend) |
| << FixItHint::CreateRemoval( |
| SourceRange(TemplateParams->getTemplateLoc(), |
| TemplateParams->getRAngleLoc())) |
| << SourceRange(LAngleLoc, RAngleLoc); |
| else |
| isExplicitSpecialization = true; |
| } else if (TUK != TUK_Friend) { |
| Diag(KWLoc, diag::err_template_spec_needs_header) |
| << FixItHint::CreateInsertion(KWLoc, "template<> "); |
| isExplicitSpecialization = true; |
| } |
| |
| // Check that the specialization uses the same tag kind as the |
| // original template. |
| TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!"); |
| if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), |
| Kind, KWLoc, |
| *ClassTemplate->getIdentifier())) { |
| Diag(KWLoc, diag::err_use_with_wrong_tag) |
| << ClassTemplate |
| << FixItHint::CreateReplacement(KWLoc, |
| ClassTemplate->getTemplatedDecl()->getKindName()); |
| Diag(ClassTemplate->getTemplatedDecl()->getLocation(), |
| diag::note_previous_use); |
| Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); |
| } |
| |
| // Translate the parser's template argument list in our AST format. |
| TemplateArgumentListInfo TemplateArgs; |
| TemplateArgs.setLAngleLoc(LAngleLoc); |
| TemplateArgs.setRAngleLoc(RAngleLoc); |
| translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| |
| // Check for unexpanded parameter packs in any of the template arguments. |
| for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
| if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], |
| UPPC_PartialSpecialization)) |
| return true; |
| |
| // Check that the template argument list is well-formed for this |
| // template. |
| llvm::SmallVector<TemplateArgument, 4> Converted; |
| if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, |
| TemplateArgs, false, Converted)) |
| return true; |
| |
| assert((Converted.size() == ClassTemplate->getTemplateParameters()->size()) && |
| "Converted template argument list is too short!"); |
| |
| // Find the class template (partial) specialization declaration that |
| // corresponds to these arguments. |
| if (isPartialSpecialization) { |
| if (CheckClassTemplatePartialSpecializationArgs(*this, |
| ClassTemplate->getTemplateParameters(), |
| Converted)) |
| return true; |
| |
| if (!Name.isDependent() && |
| !TemplateSpecializationType::anyDependentTemplateArguments( |
| TemplateArgs.getArgumentArray(), |
| TemplateArgs.size())) { |
| Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) |
| << ClassTemplate->getDeclName(); |
| isPartialSpecialization = false; |
| } |
| } |
| |
| void *InsertPos = 0; |
| ClassTemplateSpecializationDecl *PrevDecl = 0; |
| |
| if (isPartialSpecialization) |
| // FIXME: Template parameter list matters, too |
| PrevDecl |
| = ClassTemplate->findPartialSpecialization(Converted.data(), |
| Converted.size(), |
| InsertPos); |
| else |
| PrevDecl |
| = ClassTemplate->findSpecialization(Converted.data(), |
| Converted.size(), InsertPos); |
| |
| ClassTemplateSpecializationDecl *Specialization = 0; |
| |
| // Check whether we can declare a class template specialization in |
| // the current scope. |
| if (TUK != TUK_Friend && |
| CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl, |
| TemplateNameLoc, |
| isPartialSpecialization)) |
| return true; |
| |
| // The canonical type |
| QualType CanonType; |
| if (PrevDecl && |
| (PrevDecl->getSpecializationKind() == TSK_Undeclared || |
| TUK == TUK_Friend)) { |
| // Since the only prior class template specialization with these |
| // arguments was referenced but not declared, or we're only |
| // referencing this specialization as a friend, reuse that |
| // declaration node as our own, updating its source location and |
| // the list of outer template parameters to reflect our new declaration. |
| Specialization = PrevDecl; |
| Specialization->setLocation(TemplateNameLoc); |
| if (TemplateParameterLists.size() > 0) { |
| Specialization->setTemplateParameterListsInfo(Context, |
| TemplateParameterLists.size(), |
| (TemplateParameterList**) TemplateParameterLists.release()); |
| } |
| PrevDecl = 0; |
| CanonType = Context.getTypeDeclType(Specialization); |
| } else if (isPartialSpecialization) { |
| // Build the canonical type that describes the converted template |
| // arguments of the class template partial specialization. |
| TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); |
| CanonType = Context.getTemplateSpecializationType(CanonTemplate, |
| Converted.data(), |
| Converted.size()); |
| |
| if (Context.hasSameType(CanonType, |
| ClassTemplate->getInjectedClassNameSpecialization())) { |
| // C++ [temp.class.spec]p9b3: |
| // |
| // -- The argument list of the specialization shall not be identical |
| // to the implicit argument list of the primary template. |
| Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) |
| << (TUK == TUK_Definition) |
| << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); |
| return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS, |
| ClassTemplate->getIdentifier(), |
| TemplateNameLoc, |
| Attr, |
| TemplateParams, |
| AS_none, |
| TemplateParameterLists.size() - 1, |
| (TemplateParameterList**) TemplateParameterLists.release()); |
| } |
| |
| // Create a new class template partial specialization declaration node. |
| ClassTemplatePartialSpecializationDecl *PrevPartial |
| = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl); |
| unsigned SequenceNumber = PrevPartial? PrevPartial->getSequenceNumber() |
| : ClassTemplate->getNextPartialSpecSequenceNumber(); |
| ClassTemplatePartialSpecializationDecl *Partial |
| = ClassTemplatePartialSpecializationDecl::Create(Context, Kind, |
| ClassTemplate->getDeclContext(), |
| KWLoc, TemplateNameLoc, |
| TemplateParams, |
| ClassTemplate, |
| Converted.data(), |
| Converted.size(), |
| TemplateArgs, |
| CanonType, |
| PrevPartial, |
| SequenceNumber); |
| SetNestedNameSpecifier(Partial, SS); |
| if (TemplateParameterLists.size() > 1 && SS.isSet()) { |
| Partial->setTemplateParameterListsInfo(Context, |
| TemplateParameterLists.size() - 1, |
| (TemplateParameterList**) TemplateParameterLists.release()); |
| } |
| |
| if (!PrevPartial) |
| ClassTemplate->AddPartialSpecialization(Partial, InsertPos); |
| Specialization = Partial; |
| |
| // If we are providing an explicit specialization of a member class |
| // template specialization, make a note of that. |
| if (PrevPartial && PrevPartial->getInstantiatedFromMember()) |
| PrevPartial->setMemberSpecialization(); |
| |
| // Check that all of the template parameters of the class template |
| // partial specialization are deducible from the template |
| // arguments. If not, this class template partial specialization |
| // will never be used. |
| llvm::SmallVector<bool, 8> DeducibleParams; |
| DeducibleParams.resize(TemplateParams->size()); |
| MarkUsedTemplateParameters(Partial->getTemplateArgs(), true, |
| TemplateParams->getDepth(), |
| DeducibleParams); |
| unsigned NumNonDeducible = 0; |
| for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) |
| if (!DeducibleParams[I]) |
| ++NumNonDeducible; |
| |
| if (NumNonDeducible) { |
| Diag(TemplateNameLoc, diag::warn_partial_specs_not_deducible) |
| << (NumNonDeducible > 1) |
| << SourceRange(TemplateNameLoc, RAngleLoc); |
| for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) { |
| if (!DeducibleParams[I]) { |
| NamedDecl *Param = cast<NamedDecl>(TemplateParams->getParam(I)); |
| if (Param->getDeclName()) |
| Diag(Param->getLocation(), |
| diag::note_partial_spec_unused_parameter) |
| << Param->getDeclName(); |
| else |
| Diag(Param->getLocation(), |
| diag::note_partial_spec_unused_parameter) |
| << "<anonymous>"; |
| } |
| } |
| } |
| } else { |
| // Create a new class template specialization declaration node for |
| // this explicit specialization or friend declaration. |
| Specialization |
| = ClassTemplateSpecializationDecl::Create(Context, Kind, |
| ClassTemplate->getDeclContext(), |
| KWLoc, TemplateNameLoc, |
| ClassTemplate, |
| Converted.data(), |
| Converted.size(), |
| PrevDecl); |
| SetNestedNameSpecifier(Specialization, SS); |
| if (TemplateParameterLists.size() > 0) { |
| Specialization->setTemplateParameterListsInfo(Context, |
| TemplateParameterLists.size(), |
| (TemplateParameterList**) TemplateParameterLists.release()); |
| } |
| |
| if (!PrevDecl) |
| ClassTemplate->AddSpecialization(Specialization, InsertPos); |
| |
| CanonType = Context.getTypeDeclType(Specialization); |
| } |
| |
| // C++ [temp.expl.spec]p6: |
| // If a template, a member template or the member of a class template is |
| // explicitly specialized then that specialization shall be declared |
| // before the first use of that specialization that would cause an implicit |
| // instantiation to take place, in every translation unit in which such a |
| // use occurs; no diagnostic is required. |
| if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { |
| bool Okay = false; |
| for (NamedDecl *Prev = PrevDecl; Prev; Prev = getPreviousDecl(Prev)) { |
| // Is there any previous explicit specialization declaration? |
| if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
| Okay = true; |
| break; |
| } |
| } |
| |
| if (!Okay) { |
| SourceRange Range(TemplateNameLoc, RAngleLoc); |
| Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) |
| << Context.getTypeDeclType(Specialization) << Range; |
| |
| Diag(PrevDecl->getPointOfInstantiation(), |
| diag::note_instantiation_required_here) |
| << (PrevDecl->getTemplateSpecializationKind() |
| != TSK_ImplicitInstantiation); |
| return true; |
| } |
| } |
| |
| // If this is not a friend, note that this is an explicit specialization. |
| if (TUK != TUK_Friend) |
| Specialization->setSpecializationKind(TSK_ExplicitSpecialization); |
| |
| // Check that this isn't a redefinition of this specialization. |
| if (TUK == TUK_Definition) { |
| if (RecordDecl *Def = Specialization->getDefinition()) { |
| SourceRange Range(TemplateNameLoc, RAngleLoc); |
| Diag(TemplateNameLoc, diag::err_redefinition) |
| << Context.getTypeDeclType(Specialization) << Range; |
| Diag(Def->getLocation(), diag::note_previous_definition); |
| Specialization->setInvalidDecl(); |
| return true; |
| } |
| } |
| |
| if (Attr) |
| ProcessDeclAttributeList(S, Specialization, Attr); |
| |
| // 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 |
| = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, |
| TemplateArgs, CanonType); |
| if (TUK != TUK_Friend) { |
| Specialization->setTypeAsWritten(WrittenTy); |
| Specialization->setTemplateKeywordLoc(TemplateKWLoc); |
| } |
| TemplateArgsIn.release(); |
| |
| // C++ [temp.expl.spec]p9: |
| // A template explicit specialization is in the scope of the |
| // namespace in which the template was defined. |
| // |
| // We actually implement this paragraph where we set the semantic |
| // context (in the creation of the ClassTemplateSpecializationDecl), |
| // but we also maintain the lexical context where the actual |
| // definition occurs. |
| Specialization->setLexicalDeclContext(CurContext); |
| |
| // We may be starting the definition of this specialization. |
| if (TUK == TUK_Definition) |
| Specialization->startDefinition(); |
| |
| if (TUK == TUK_Friend) { |
| FriendDecl *Friend = FriendDecl::Create(Context, CurContext, |
| TemplateNameLoc, |
| WrittenTy, |
| /*FIXME:*/KWLoc); |
| Friend->setAccess(AS_public); |
| CurContext->addDecl(Friend); |
| } else { |
| // Add the specialization into its lexical context, so that it can |
| // be seen when iterating through the list of declarations in that |
| // context. However, specializations are not found by name lookup. |
| CurContext->addDecl(Specialization); |
| } |
| return Specialization; |
| } |
| |
| Decl *Sema::ActOnTemplateDeclarator(Scope *S, |
| MultiTemplateParamsArg TemplateParameterLists, |
| Declarator &D) { |
| return HandleDeclarator(S, D, move(TemplateParameterLists), false); |
| } |
| |
| Decl *Sema::ActOnStartOfFunctionTemplateDef(Scope *FnBodyScope, |
| MultiTemplateParamsArg TemplateParameterLists, |
| Declarator &D) { |
| assert(getCurFunctionDecl() == 0 && "Function parsing confused"); |
| DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); |
| |
| if (FTI.hasPrototype) { |
| // FIXME: Diagnose arguments without names in C. |
| } |
| |
| Scope *ParentScope = FnBodyScope->getParent(); |
| |
| Decl *DP = HandleDeclarator(ParentScope, D, |
| move(TemplateParameterLists), |
| /*IsFunctionDefinition=*/true); |
| if (FunctionTemplateDecl *FunctionTemplate |
| = dyn_cast_or_null<FunctionTemplateDecl>(DP)) |
| return ActOnStartOfFunctionDef(FnBodyScope, |
| FunctionTemplate->getTemplatedDecl()); |
| if (FunctionDecl *Function = dyn_cast_or_null<FunctionDecl>(DP)) |
| return ActOnStartOfFunctionDef(FnBodyScope, Function); |
| return 0; |
| } |
| |
| /// \brief Strips various properties off an implicit instantiation |
| /// that has just been explicitly specialized. |
| static void StripImplicitInstantiation(NamedDecl *D) { |
| D->dropAttrs(); |
| |
| if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
| FD->setInlineSpecified(false); |
| } |
| } |
| |
| /// \brief Diagnose cases where we have an explicit template specialization |
| /// before/after an explicit template instantiation, producing diagnostics |
| /// for those cases where they are required and determining whether the |
| /// new specialization/instantiation will have any effect. |
| /// |
| /// \param NewLoc the location of the new explicit specialization or |
| /// instantiation. |
| /// |
| /// \param NewTSK the kind of the new explicit specialization or instantiation. |
| /// |
| /// \param PrevDecl the previous declaration of the entity. |
| /// |
| /// \param PrevTSK the kind of the old explicit specialization or instantiatin. |
| /// |
| /// \param PrevPointOfInstantiation if valid, indicates where the previus |
| /// declaration was instantiated (either implicitly or explicitly). |
| /// |
| /// \param HasNoEffect will be set to true to indicate that the new |
| /// specialization or instantiation has no effect and should be ignored. |
| /// |
| /// \returns true if there was an error that should prevent the introduction of |
| /// the new declaration into the AST, false otherwise. |
| bool |
| Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc, |
| TemplateSpecializationKind NewTSK, |
| NamedDecl *PrevDecl, |
| TemplateSpecializationKind PrevTSK, |
| SourceLocation PrevPointOfInstantiation, |
| bool &HasNoEffect) { |
| HasNoEffect = false; |
| |
| switch (NewTSK) { |
| case TSK_Undeclared: |
| case TSK_ImplicitInstantiation: |
| assert(false && "Don't check implicit instantiations here"); |
| return false; |
| |
| case TSK_ExplicitSpecialization: |
| switch (PrevTSK) { |
| case TSK_Undeclared: |
| case TSK_ExplicitSpecialization: |
| // Okay, we're just specializing something that is either already |
| // explicitly specialized or has merely been mentioned without any |
| // instantiation. |
| return false; |
| |
| case TSK_ImplicitInstantiation: |
| if (PrevPointOfInstantiation.isInvalid()) { |
| // The declaration itself has not actually been instantiated, so it is |
| // still okay to specialize it. |
| StripImplicitInstantiation(PrevDecl); |
| return false; |
| } |
| // Fall through |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| case TSK_ExplicitInstantiationDefinition: |
| assert((PrevTSK == TSK_ImplicitInstantiation || |
| PrevPointOfInstantiation.isValid()) && |
| "Explicit instantiation without point of instantiation?"); |
| |
| // C++ [temp.expl.spec]p6: |
| // If a template, a member template or the member of a class template |
| // is explicitly specialized then that specialization shall be declared |
| // before the first use of that specialization that would cause an |
| // implicit instantiation to take place, in every translation unit in |
| // which such a use occurs; no diagnostic is required. |
| for (NamedDecl *Prev = PrevDecl; Prev; Prev = getPreviousDecl(Prev)) { |
| // Is there any previous explicit specialization declaration? |
| if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) |
| return false; |
| } |
| |
| Diag(NewLoc, diag::err_specialization_after_instantiation) |
| << PrevDecl; |
| Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here) |
| << (PrevTSK != TSK_ImplicitInstantiation); |
| |
| return true; |
| } |
| break; |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| switch (PrevTSK) { |
| case TSK_ExplicitInstantiationDeclaration: |
| // This explicit instantiation declaration is redundant (that's okay). |
| HasNoEffect = true; |
| return false; |
| |
| case TSK_Undeclared: |
| case TSK_ImplicitInstantiation: |
| // We're explicitly instantiating something that may have already been |
| // implicitly instantiated; that's fine. |
| return false; |
| |
| case TSK_ExplicitSpecialization: |
| // C++0x [temp.explicit]p4: |
| // For a given set of template parameters, if an explicit instantiation |
| // of a template appears after a declaration of an explicit |
| // specialization for that template, the explicit instantiation has no |
| // effect. |
| HasNoEffect = true; |
| return false; |
| |
| case TSK_ExplicitInstantiationDefinition: |
| // C++0x [temp.explicit]p10: |
| // If an entity is the subject of both an explicit instantiation |
| // declaration and an explicit instantiation definition in the same |
| // translation unit, the definition shall follow the declaration. |
| Diag(NewLoc, |
| diag::err_explicit_instantiation_declaration_after_definition); |
| Diag(PrevPointOfInstantiation, |
| diag::note_explicit_instantiation_definition_here); |
| assert(PrevPointOfInstantiation.isValid() && |
| "Explicit instantiation without point of instantiation?"); |
| HasNoEffect = true; |
| return false; |
| } |
| break; |
| |
| case TSK_ExplicitInstantiationDefinition: |
| switch (PrevTSK) { |
| case TSK_Undeclared: |
| case TSK_ImplicitInstantiation: |
| // We're explicitly instantiating something that may have already been |
| // implicitly instantiated; that's fine. |
| return false; |
| |
| case TSK_ExplicitSpecialization: |
| // C++ DR 259, C++0x [temp.explicit]p4: |
| // For a given set of template parameters, if an explicit |
| // instantiation of a template appears after a declaration of |
| // an explicit specialization for that template, the explicit |
| // instantiation has no effect. |
| // |
| // In C++98/03 mode, we only give an extension warning here, because it |
| // is not harmful to try to explicitly instantiate something that |
| // has been explicitly specialized. |
| if (!getLangOptions().CPlusPlus0x) { |
| Diag(NewLoc, diag::ext_explicit_instantiation_after_specialization) |
| << PrevDecl; |
| Diag(PrevDecl->getLocation(), |
| diag::note_previous_template_specialization); |
| } |
| HasNoEffect = true; |
| return false; |
| |
| case TSK_ExplicitInstantiationDeclaration: |
| // We're explicity instantiating a definition for something for which we |
| // were previously asked to suppress instantiations. That's fine. |
| return false; |
| |
| case TSK_ExplicitInstantiationDefinition: |
| // C++0x [temp.spec]p5: |
| // For a given template and a given set of template-arguments, |
| // - an explicit instantiation definition shall appear at most once |
| // in a program, |
| Diag(NewLoc, diag::err_explicit_instantiation_duplicate) |
| << PrevDecl; |
| Diag(PrevPointOfInstantiation, |
| diag::note_previous_explicit_instantiation); |
| HasNoEffect = true; |
| return false; |
| } |
| break; |
| } |
| |
| assert(false && "Missing specialization/instantiation case?"); |
| |
| return false; |
| } |
| |
| /// \brief Perform semantic analysis for the given dependent function |
| /// template specialization. The only possible way to get a dependent |
| /// function template specialization is with a friend declaration, |
| /// like so: |
| /// |
| /// template <class T> void foo(T); |
| /// template <class T> class A { |
| /// friend void foo<>(T); |
| /// }; |
| /// |
| /// There really isn't any useful analysis we can do here, so we |
| /// just store the information. |
| bool |
| Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD, |
| const TemplateArgumentListInfo &ExplicitTemplateArgs, |
| LookupResult &Previous) { |
| // Remove anything from Previous that isn't a function template in |
| // the correct context. |
| DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); |
| LookupResult::Filter F = Previous.makeFilter(); |
| while (F.hasNext()) { |
| NamedDecl *D = F.next()->getUnderlyingDecl(); |
| if (!isa<FunctionTemplateDecl>(D) || |
| !FDLookupContext->InEnclosingNamespaceSetOf( |
| D->getDeclContext()->getRedeclContext())) |
| F.erase(); |
| } |
| F.done(); |
| |
| // Should this be diagnosed here? |
| if (Previous.empty()) return true; |
| |
| FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(), |
| ExplicitTemplateArgs); |
| return false; |
| } |
| |
| /// \brief Perform semantic analysis for the given function template |
| /// specialization. |
| /// |
| /// This routine performs all of the semantic analysis required for an |
| /// explicit function template specialization. On successful completion, |
| /// the function declaration \p FD will become a function template |
| /// specialization. |
| /// |
| /// \param FD the function declaration, which will be updated to become a |
| /// function template specialization. |
| /// |
| /// \param ExplicitTemplateArgs the explicitly-provided template arguments, |
| /// if any. Note that this may be valid info even when 0 arguments are |
| /// explicitly provided as in, e.g., \c void sort<>(char*, char*); |
| /// as it anyway contains info on the angle brackets locations. |
| /// |
| /// \param PrevDecl the set of declarations that may be specialized by |
| /// this function specialization. |
| bool |
| Sema::CheckFunctionTemplateSpecialization(FunctionDecl *FD, |
| TemplateArgumentListInfo *ExplicitTemplateArgs, |
| LookupResult &Previous) { |
| // The set of function template specializations that could match this |
| // explicit function template specialization. |
| UnresolvedSet<8> Candidates; |
| |
| DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); |
| for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
| I != E; ++I) { |
| NamedDecl *Ovl = (*I)->getUnderlyingDecl(); |
| if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) { |
| // Only consider templates found within the same semantic lookup scope as |
| // FD. |
| if (!FDLookupContext->InEnclosingNamespaceSetOf( |
| Ovl->getDeclContext()->getRedeclContext())) |
| continue; |
| |
| // C++ [temp.expl.spec]p11: |
| // A trailing template-argument can be left unspecified in the |
| // template-id naming an explicit function template specialization |
| // provided it can be deduced from the function argument type. |
| // Perform template argument deduction to determine whether we may be |
| // specializing this template. |
| // FIXME: It is somewhat wasteful to build |
| TemplateDeductionInfo Info(Context, FD->getLocation()); |
| FunctionDecl *Specialization = 0; |
| if (TemplateDeductionResult TDK |
| = DeduceTemplateArguments(FunTmpl, ExplicitTemplateArgs, |
| FD->getType(), |
| Specialization, |
| Info)) { |
| // FIXME: Template argument deduction failed; record why it failed, so |
| // that we can provide nifty diagnostics. |
| (void)TDK; |
| continue; |
| } |
| |
| // Record this candidate. |
| Candidates.addDecl(Specialization, I.getAccess()); |
| } |
| } |
| |
| // Find the most specialized function template. |
| UnresolvedSetIterator Result |
| = getMostSpecialized(Candidates.begin(), Candidates.end(), |
| TPOC_Other, 0, FD->getLocation(), |
| PDiag(diag::err_function_template_spec_no_match) |
| << FD->getDeclName(), |
| PDiag(diag::err_function_template_spec_ambiguous) |
| << FD->getDeclName() << (ExplicitTemplateArgs != 0), |
| PDiag(diag::note_function_template_spec_matched)); |
| if (Result == Candidates.end()) |
| return true; |
| |
| // Ignore access information; it doesn't figure into redeclaration checking. |
| FunctionDecl *Specialization = cast<FunctionDecl>(*Result); |
| |
| FunctionTemplateSpecializationInfo *SpecInfo |
| = Specialization->getTemplateSpecializationInfo(); |
| assert(SpecInfo && "Function template specialization info missing?"); |
| { |
| // Note: do not overwrite location info if previous template |
| // specialization kind was explicit. |
| TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind(); |
| if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) |
| Specialization->setLocation(FD->getLocation()); |
| } |
| |
| // FIXME: Check if the prior specialization has a point of instantiation. |
| // If so, we have run afoul of . |
| |
| // If this is a friend declaration, then we're not really declaring |
| // an explicit specialization. |
| bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None); |
| |
| // Check the scope of this explicit specialization. |
| if (!isFriend && |
| CheckTemplateSpecializationScope(*this, |
| Specialization->getPrimaryTemplate(), |
| Specialization, FD->getLocation(), |
| false)) |
| return true; |
| |
| // C++ [temp.expl.spec]p6: |
| // If a template, a member template or the member of a class template is |
| // explicitly specialized then that specialization shall be declared |
| // before the first use of that specialization that would cause an implicit |
| // instantiation to take place, in every translation unit in which such a |
| // use occurs; no diagnostic is required. |
| bool HasNoEffect = false; |
| if (!isFriend && |
| CheckSpecializationInstantiationRedecl(FD->getLocation(), |
| TSK_ExplicitSpecialization, |
| Specialization, |
| SpecInfo->getTemplateSpecializationKind(), |
| SpecInfo->getPointOfInstantiation(), |
| HasNoEffect)) |
| return true; |
| |
| // Mark the prior declaration as an explicit specialization, so that later |
| // clients know that this is an explicit specialization. |
| if (!isFriend) { |
| SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization); |
| MarkUnusedFileScopedDecl(Specialization); |
| } |
| |
| // Turn the given function declaration into a function template |
| // specialization, with the template arguments from the previous |
| // specialization. |
| // Take copies of (semantic and syntactic) template argument lists. |
| const TemplateArgumentList* TemplArgs = new (Context) |
| TemplateArgumentList(Specialization->getTemplateSpecializationArgs()); |
| const TemplateArgumentListInfo* TemplArgsAsWritten = ExplicitTemplateArgs |
| ? new (Context) TemplateArgumentListInfo(*ExplicitTemplateArgs) : 0; |
| FD->setFunctionTemplateSpecialization(Specialization->getPrimaryTemplate(), |
| TemplArgs, /*InsertPos=*/0, |
| SpecInfo->getTemplateSpecializationKind(), |
| TemplArgsAsWritten); |
| FD->setStorageClass(Specialization->getStorageClass()); |
| |
| // The "previous declaration" for this function template specialization is |
| // the prior function template specialization. |
| Previous.clear(); |
| Previous.addDecl(Specialization); |
| return false; |
| } |
| |
| /// \brief Perform semantic analysis for the given non-template member |
| /// specialization. |
| /// |
| /// This routine performs all of the semantic analysis required for an |
| /// explicit member function specialization. On successful completion, |
| /// the function declaration \p FD will become a member function |
| /// specialization. |
| /// |
| /// \param Member the member declaration, which will be updated to become a |
| /// specialization. |
| /// |
| /// \param Previous the set of declarations, one of which may be specialized |
| /// by this function specialization; the set will be modified to contain the |
| /// redeclared member. |
| bool |
| Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) { |
| assert(!isa<TemplateDecl>(Member) && "Only for non-template members"); |
| |
| // Try to find the member we are instantiating. |
| NamedDecl *Instantiation = 0; |
| NamedDecl *InstantiatedFrom = 0; |
| MemberSpecializationInfo *MSInfo = 0; |
| |
| if (Previous.empty()) { |
| // Nowhere to look anyway. |
| } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) { |
| for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
| I != E; ++I) { |
| NamedDecl *D = (*I)->getUnderlyingDecl(); |
| if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { |
| if (Context.hasSameType(Function->getType(), Method->getType())) { |
| Instantiation = Method; |
| InstantiatedFrom = Method->getInstantiatedFromMemberFunction(); |
| MSInfo = Method->getMemberSpecializationInfo(); |
| break; |
| } |
| } |
| } |
| } else if (isa<VarDecl>(Member)) { |
| VarDecl *PrevVar; |
| if (Previous.isSingleResult() && |
| (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl()))) |
| if (PrevVar->isStaticDataMember()) { |
| Instantiation = PrevVar; |
| InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember(); |
| MSInfo = PrevVar->getMemberSpecializationInfo(); |
| } |
| } else if (isa<RecordDecl>(Member)) { |
| CXXRecordDecl *PrevRecord; |
| if (Previous.isSingleResult() && |
| (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) { |
| Instantiation = PrevRecord; |
| InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass(); |
| MSInfo = PrevRecord->getMemberSpecializationInfo(); |
| } |
| } |
| |
| if (!Instantiation) { |
| // There is no previous declaration that matches. Since member |
| // specializations are always out-of-line, the caller will complain about |
| // this mismatch later. |
| return false; |
| } |
| |
| // If this is a friend, just bail out here before we start turning |
| // things into explicit specializations. |
| if (Member->getFriendObjectKind() != Decl::FOK_None) { |
| // Preserve instantiation information. |
| if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) { |
| cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction( |
| cast<CXXMethodDecl>(InstantiatedFrom), |
| cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind()); |
| } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) { |
| cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass( |
| cast<CXXRecordDecl>(InstantiatedFrom), |
| cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind()); |
| } |
| |
| Previous.clear(); |
| Previous.addDecl(Instantiation); |
| return false; |
| } |
| |
| // Make sure that this is a specialization of a member. |
| if (!InstantiatedFrom) { |
| Diag(Member->getLocation(), diag::err_spec_member_not_instantiated) |
| << Member; |
| Diag(Instantiation->getLocation(), diag::note_specialized_decl); |
| return true; |
| } |
| |
| // C++ [temp.expl.spec]p6: |
| // If a template, a member template or the member of a class template is |
| // explicitly specialized then that spe- cialization shall be declared |
| // before the first use of that specialization that would cause an implicit |
| // instantiation to take place, in every translation unit in which such a |
| // use occurs; no diagnostic is required. |
| assert(MSInfo && "Member specialization info missing?"); |
| |
| bool HasNoEffect = false; |
| if (CheckSpecializationInstantiationRedecl(Member->getLocation(), |
| TSK_ExplicitSpecialization, |
| Instantiation, |
| MSInfo->getTemplateSpecializationKind(), |
| MSInfo->getPointOfInstantiation(), |
| HasNoEffect)) |
| return true; |
| |
| // Check the scope of this explicit specialization. |
| if (CheckTemplateSpecializationScope(*this, |
| InstantiatedFrom, |
| Instantiation, Member->getLocation(), |
| false)) |
| return true; |
| |
| // Note that this is an explicit instantiation of a member. |
| // the original declaration to note that it is an explicit specialization |
| // (if it was previously an implicit instantiation). This latter step |
| // makes bookkeeping easier. |
| if (isa<FunctionDecl>(Member)) { |
| FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation); |
| if (InstantiationFunction->getTemplateSpecializationKind() == |
| TSK_ImplicitInstantiation) { |
| InstantiationFunction->setTemplateSpecializationKind( |
| TSK_ExplicitSpecialization); |
| InstantiationFunction->setLocation(Member->getLocation()); |
| } |
| |
| cast<FunctionDecl>(Member)->setInstantiationOfMemberFunction( |
| cast<CXXMethodDecl>(InstantiatedFrom), |
| TSK_ExplicitSpecialization); |
| MarkUnusedFileScopedDecl(InstantiationFunction); |
| } else if (isa<VarDecl>(Member)) { |
| VarDecl *InstantiationVar = cast<VarDecl>(Instantiation); |
| if (InstantiationVar->getTemplateSpecializationKind() == |
| TSK_ImplicitInstantiation) { |
| InstantiationVar->setTemplateSpecializationKind( |
| TSK_ExplicitSpecialization); |
| InstantiationVar->setLocation(Member->getLocation()); |
| } |
| |
| Context.setInstantiatedFromStaticDataMember(cast<VarDecl>(Member), |
| cast<VarDecl>(InstantiatedFrom), |
| TSK_ExplicitSpecialization); |
| MarkUnusedFileScopedDecl(InstantiationVar); |
| } else { |
| assert(isa<CXXRecordDecl>(Member) && "Only member classes remain"); |
| CXXRecordDecl *InstantiationClass = cast<CXXRecordDecl>(Instantiation); |
| if (InstantiationClass->getTemplateSpecializationKind() == |
| TSK_ImplicitInstantiation) { |
| InstantiationClass->setTemplateSpecializationKind( |
| TSK_ExplicitSpecialization); |
| InstantiationClass->setLocation(Member->getLocation()); |
| } |
| |
| cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass( |
| cast<CXXRecordDecl>(InstantiatedFrom), |
| TSK_ExplicitSpecialization); |
| } |
| |
| // Save the caller the trouble of having to figure out which declaration |
| // this specialization matches. |
| Previous.clear(); |
| Previous.addDecl(Instantiation); |
| return false; |
| } |
| |
| /// \brief Check the scope of an explicit instantiation. |
| /// |
| /// \returns true if a serious error occurs, false otherwise. |
| static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D, |
| SourceLocation InstLoc, |
| bool WasQualifiedName) { |
| DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext(); |
| DeclContext *CurContext = S.CurContext->getRedeclContext(); |
| |
| if (CurContext->isRecord()) { |
| S.Diag(InstLoc, diag::err_explicit_instantiation_in_class) |
| << D; |
| return true; |
| } |
| |
| // C++0x [temp.explicit]p2: |
| // An explicit instantiation shall appear in an enclosing namespace of its |
| // template. |
| // |
| // This is DR275, which we do not retroactively apply to C++98/03. |
| if (S.getLangOptions().CPlusPlus0x && |
| !CurContext->Encloses(OrigContext)) { |
| if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) |
| S.Diag(InstLoc, |
| S.getLangOptions().CPlusPlus0x? |
| diag::err_explicit_instantiation_out_of_scope |
| : diag::warn_explicit_instantiation_out_of_scope_0x) |
| << D << NS; |
| else |
| S.Diag(InstLoc, |
| S.getLangOptions().CPlusPlus0x? |
| diag::err_explicit_instantiation_must_be_global |
| : diag::warn_explicit_instantiation_out_of_scope_0x) |
| << D; |
| S.Diag(D->getLocation(), diag::note_explicit_instantiation_here); |
| return false; |
| } |
| |
| // C++0x [temp.explicit]p2: |
| // If the name declared in the explicit instantiation is an unqualified |
| // name, the explicit instantiation shall appear in the namespace where |
| // its template is declared or, if that namespace is inline (7.3.1), any |
| // namespace from its enclosing namespace set. |
| if (WasQualifiedName) |
| return false; |
| |
| if (CurContext->InEnclosingNamespaceSetOf(OrigContext)) |
| return false; |
| |
| S.Diag(InstLoc, |
| S.getLangOptions().CPlusPlus0x? |
| diag::err_explicit_instantiation_unqualified_wrong_namespace |
| : diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x) |
| << D << OrigContext; |
| S.Diag(D->getLocation(), diag::note_explicit_instantiation_here); |
| return false; |
| } |
| |
| /// \brief Determine whether the given scope specifier has a template-id in it. |
| static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) { |
| if (!SS.isSet()) |
| return false; |
| |
| // C++0x [temp.explicit]p2: |
| // If the explicit instantiation is for a member function, a member class |
| // or a static data member of a class template specialization, the name of |
| // the class template specialization in the qualified-id for the member |
| // name shall be a simple-template-id. |
| // |
| // C++98 has the same restriction, just worded differently. |
| for (NestedNameSpecifier *NNS = (NestedNameSpecifier *)SS.getScopeRep(); |
| NNS; NNS = NNS->getPrefix()) |
| if (const Type *T = NNS->getAsType()) |
| if (isa<TemplateSpecializationType>(T)) |
| return true; |
| |
| return false; |
| } |
| |
| // Explicit instantiation of a class template specialization |
| DeclResult |
| Sema::ActOnExplicitInstantiation(Scope *S, |
| SourceLocation ExternLoc, |
| SourceLocation TemplateLoc, |
| unsigned TagSpec, |
| SourceLocation KWLoc, |
| const CXXScopeSpec &SS, |
| TemplateTy TemplateD, |
| SourceLocation TemplateNameLoc, |
| SourceLocation LAngleLoc, |
| ASTTemplateArgsPtr TemplateArgsIn, |
| SourceLocation RAngleLoc, |
| AttributeList *Attr) { |
| // Find the class template we're specializing |
| TemplateName Name = TemplateD.getAsVal<TemplateName>(); |
| ClassTemplateDecl *ClassTemplate |
| = cast<ClassTemplateDecl>(Name.getAsTemplateDecl()); |
| |
| // Check that the specialization uses the same tag kind as the |
| // original template. |
| TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| assert(Kind != TTK_Enum && |
| "Invalid enum tag in class template explicit instantiation!"); |
| if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), |
| Kind, KWLoc, |
| *ClassTemplate->getIdentifier())) { |
| Diag(KWLoc, diag::err_use_with_wrong_tag) |
| << ClassTemplate |
| << FixItHint::CreateReplacement(KWLoc, |
| ClassTemplate->getTemplatedDecl()->getKindName()); |
| Diag(ClassTemplate->getTemplatedDecl()->getLocation(), |
| diag::note_previous_use); |
| Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); |
| } |
| |
| // C++0x [temp.explicit]p2: |
| // There are two forms of explicit instantiation: an explicit instantiation |
| // definition and an explicit instantiation declaration. An explicit |
| // instantiation declaration begins with the extern keyword. [...] |
| TemplateSpecializationKind TSK |
| = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
| : TSK_ExplicitInstantiationDeclaration; |
| |
| // Translate the parser's template argument list in our AST format. |
| TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| |
| // Check that the template argument list is well-formed for this |
| // template. |
| llvm::SmallVector<TemplateArgument, 4> Converted; |
| if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, |
| TemplateArgs, false, Converted)) |
| return true; |
| |
| assert((Converted.size() == ClassTemplate->getTemplateParameters()->size()) && |
| "Converted template argument list is too short!"); |
| |
| // Find the class template specialization declaration that |
| // corresponds to these arguments. |
| void *InsertPos = 0; |
| ClassTemplateSpecializationDecl *PrevDecl |
| = ClassTemplate->findSpecialization(Converted.data(), |
| Converted.size(), InsertPos); |
| |
| TemplateSpecializationKind PrevDecl_TSK |
| = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared; |
| |
| // C++0x [temp.explicit]p2: |
| // [...] An explicit instantiation shall appear in an enclosing |
| // namespace of its template. [...] |
| // |
| // This is C++ DR 275. |
| if (CheckExplicitInstantiationScope(*this, ClassTemplate, TemplateNameLoc, |
| SS.isSet())) |
| return true; |
| |
| ClassTemplateSpecializationDecl *Specialization = 0; |
| |
| bool HasNoEffect = false; |
| if (PrevDecl) { |
| if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK, |
| PrevDecl, PrevDecl_TSK, |
| PrevDecl->getPointOfInstantiation(), |
| HasNoEffect)) |
| return PrevDecl; |
| |
| // Even though HasNoEffect == true means that this explicit instantiation |
| // has no effect on semantics, we go on to put its syntax in the AST. |
| |
| if (PrevDecl_TSK == TSK_ImplicitInstantiation || |
| PrevDecl_TSK == TSK_Undeclared) { |
| // Since the only prior class template specialization with these |
| // arguments was referenced but not declared, reuse that |
| // declaration node as our own, updating the source location |
| // for the template name to reflect our new declaration. |
| // (Other source locations will be updated later.) |
| Specialization = PrevDecl; |
| Specialization->setLocation(TemplateNameLoc); |
| PrevDecl = 0; |
| } |
| } |
| |
| if (!Specialization) { |
| // Create a new class template specialization declaration node for |
| // this explicit specialization. |
| Specialization |
| = ClassTemplateSpecializationDecl::Create(Context, Kind, |
| ClassTemplate->getDeclContext(), |
| KWLoc, TemplateNameLoc, |
| ClassTemplate, |
| Converted.data(), |
| Converted.size(), |
| PrevDecl); |
| SetNestedNameSpecifier(Specialization, SS); |
| |
| if (!HasNoEffect && !PrevDecl) { |
| // Insert the new specialization. |
| ClassTemplate->AddSpecialization(Specialization, InsertPos); |
| } |
| } |
| |
| // Build the fully-sugared type for this explicit instantiation as |
| // the user wrote in the explicit instantiation itself. This means |
| // that we'll pretty-print the type retrieved from the |
| // specialization's declaration the way that the user actually wrote |
| // the explicit instantiation, rather than formatting the name based |
| // on the "canonical" representation used to store the template |
| // arguments in the specialization. |
| TypeSourceInfo *WrittenTy |
| = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, |
| TemplateArgs, |
| Context.getTypeDeclType(Specialization)); |
| Specialization->setTypeAsWritten(WrittenTy); |
| TemplateArgsIn.release(); |
| |
| // Set source locations for keywords. |
| Specialization->setExternLoc(ExternLoc); |
| Specialization->setTemplateKeywordLoc(TemplateLoc); |
| |
| // Add the explicit instantiation into its lexical context. However, |
| // since explicit instantiations are never found by name lookup, we |
| // just put it into the declaration context directly. |
| Specialization->setLexicalDeclContext(CurContext); |
| CurContext->addDecl(Specialization); |
| |
| // Syntax is now OK, so return if it has no other effect on semantics. |
| if (HasNoEffect) { |
| // Set the template specialization kind. |
| Specialization->setTemplateSpecializationKind(TSK); |
| return Specialization; |
| } |
| |
| // C++ [temp.explicit]p3: |
| // A definition of a class template or class member template |
| // shall be in scope at the point of the explicit instantiation of |
| // the class template or class member template. |
| // |
| // This check comes when we actually try to perform the |
| // instantiation. |
| ClassTemplateSpecializationDecl *Def |
| = cast_or_null<ClassTemplateSpecializationDecl>( |
| Specialization->getDefinition()); |
| if (!Def) |
| InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK); |
| else if (TSK == TSK_ExplicitInstantiationDefinition) { |
| MarkVTableUsed(TemplateNameLoc, Specialization, true); |
| Specialization->setPointOfInstantiation(Def->getPointOfInstantiation()); |
| } |
| |
| // Instantiate the members of this class template specialization. |
| Def = cast_or_null<ClassTemplateSpecializationDecl>( |
| Specialization->getDefinition()); |
| if (Def) { |
| TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind(); |
| |
| // Fix a TSK_ExplicitInstantiationDeclaration followed by a |
| // TSK_ExplicitInstantiationDefinition |
| if (Old_TSK == TSK_ExplicitInstantiationDeclaration && |
| TSK == TSK_ExplicitInstantiationDefinition) |
| Def->setTemplateSpecializationKind(TSK); |
| |
| InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK); |
| } |
| |
| // Set the template specialization kind. |
| Specialization->setTemplateSpecializationKind(TSK); |
| return Specialization; |
| } |
| |
| // Explicit instantiation of a member class of a class template. |
| DeclResult |
| Sema::ActOnExplicitInstantiation(Scope *S, |
| SourceLocation ExternLoc, |
| SourceLocation TemplateLoc, |
| unsigned TagSpec, |
| SourceLocation KWLoc, |
| CXXScopeSpec &SS, |
| IdentifierInfo *Name, |
| SourceLocation NameLoc, |
| AttributeList *Attr) { |
| |
| bool Owned = false; |
| bool IsDependent = false; |
| Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference, |
| KWLoc, SS, Name, NameLoc, Attr, AS_none, |
| MultiTemplateParamsArg(*this, 0, 0), |
| Owned, IsDependent, false, false, |
| TypeResult()); |
| assert(!IsDependent && "explicit instantiation of dependent name not yet handled"); |
| |
| if (!TagD) |
| return true; |
| |
| TagDecl *Tag = cast<TagDecl>(TagD); |
| if (Tag->isEnum()) { |
| Diag(TemplateLoc, diag::err_explicit_instantiation_enum) |
| << Context.getTypeDeclType(Tag); |
| return true; |
| } |
| |
| if (Tag->isInvalidDecl()) |
| return true; |
| |
| CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag); |
| CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); |
| if (!Pattern) { |
| Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type) |
| << Context.getTypeDeclType(Record); |
| Diag(Record->getLocation(), diag::note_nontemplate_decl_here); |
| return true; |
| } |
| |
| // C++0x [temp.explicit]p2: |
| // If the explicit instantiation is for a class or member class, the |
| // elaborated-type-specifier in the declaration shall include a |
| // simple-template-id. |
| // |
| // C++98 has the same restriction, just worded differently. |
| if (!ScopeSpecifierHasTemplateId(SS)) |
| Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id) |
| << Record << SS.getRange(); |
| |
| // C++0x [temp.explicit]p2: |
| // There are two forms of explicit instantiation: an explicit instantiation |
| // definition and an explicit instantiation declaration. An explicit |
| // instantiation declaration begins with the extern keyword. [...] |
| TemplateSpecializationKind TSK |
| = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
| : TSK_ExplicitInstantiationDeclaration; |
| |
| // C++0x [temp.explicit]p2: |
| // [...] An explicit instantiation shall appear in an enclosing |
| // namespace of its template. [...] |
| // |
| // This is C++ DR 275. |
| CheckExplicitInstantiationScope(*this, Record, NameLoc, true); |
| |
| // Verify that it is okay to explicitly instantiate here. |
| CXXRecordDecl *PrevDecl |
| = cast_or_null<CXXRecordDecl>(Record->getPreviousDeclaration()); |
| if (!PrevDecl && Record->getDefinition()) |
| PrevDecl = Record; |
| if (PrevDecl) { |
| MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo(); |
| bool HasNoEffect = false; |
| assert(MSInfo && "No member specialization information?"); |
| if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK, |
| PrevDecl, |
| MSInfo->getTemplateSpecializationKind(), |
| MSInfo->getPointOfInstantiation(), |
| HasNoEffect)) |
| return true; |
| if (HasNoEffect) |
| return TagD; |
| } |
| |
| CXXRecordDecl *RecordDef |
| = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
| if (!RecordDef) { |
| // C++ [temp.explicit]p3: |
| // A definition of a member class of a class template shall be in scope |
| // at the point of an explicit instantiation of the member class. |
| CXXRecordDecl *Def |
| = cast_or_null<CXXRecordDecl>(Pattern->getDefinition()); |
| if (!Def) { |
| Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member) |
| << 0 << Record->getDeclName() << Record->getDeclContext(); |
| Diag(Pattern->getLocation(), diag::note_forward_declaration) |
| << Pattern; |
| return true; |
| } else { |
| if (InstantiateClass(NameLoc, Record, Def, |
| getTemplateInstantiationArgs(Record), |
| TSK)) |
| return true; |
| |
| RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
| if (!RecordDef) |
| return true; |
| } |
| } |
| |
| // Instantiate all of the members of the class. |
| InstantiateClassMembers(NameLoc, RecordDef, |
| getTemplateInstantiationArgs(Record), TSK); |
| |
| if (TSK == TSK_ExplicitInstantiationDefinition) |
| MarkVTableUsed(NameLoc, RecordDef, true); |
| |
| // FIXME: We don't have any representation for explicit instantiations of |
| // member classes. Such a representation is not needed for compilation, but it |
| // should be available for clients that want to see all of the declarations in |
| // the source code. |
| return TagD; |
| } |
| |
| DeclResult Sema::ActOnExplicitInstantiation(Scope *S, |
| SourceLocation ExternLoc, |
| SourceLocation TemplateLoc, |
| Declarator &D) { |
| // Explicit instantiations always require a name. |
| // TODO: check if/when DNInfo should replace Name. |
| DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
| DeclarationName Name = NameInfo.getName(); |
| if (!Name) { |
| if (!D.isInvalidType()) |
| Diag(D.getDeclSpec().getSourceRange().getBegin(), |
| diag::err_explicit_instantiation_requires_name) |
| << D.getDeclSpec().getSourceRange() |
| << D.getSourceRange(); |
| |
| return true; |
| } |
| |
| // The scope passed in may not be a decl scope. Zip up the scope tree until |
| // we find one that is. |
| while ((S->getFlags() & Scope::DeclScope) == 0 || |
| (S->getFlags() & Scope::TemplateParamScope) != 0) |
| S = S->getParent(); |
| |
| // Determine the type of the declaration. |
| TypeSourceInfo *T = GetTypeForDeclarator(D, S); |
| QualType R = T->getType(); |
| if (R.isNull()) |
| return true; |
| |
| // C++ [dcl.stc]p1: |
| // A storage-class-specifier shall not be specified in [...] an explicit |
| // instantiation (14.7.2) directive. |
| if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { |
| Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef) |
| << Name; |
| return true; |
| } else if (D.getDeclSpec().getStorageClassSpec() |
| != DeclSpec::SCS_unspecified) { |
| // Complain about then remove the storage class specifier. |
| Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class) |
| << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); |
| |
| D.getMutableDeclSpec().ClearStorageClassSpecs(); |
| } |
| |
| // C++0x [temp.explicit]p1: |
| // [...] An explicit instantiation of a function template shall not use the |
| // inline or constexpr specifiers. |
| // Presumably, this also applies to member functions of class templates as |
| // well. |
| if (D.getDeclSpec().isInlineSpecified() && getLangOptions().CPlusPlus0x) |
| Diag(D.getDeclSpec().getInlineSpecLoc(), |
| diag::err_explicit_instantiation_inline) |
| <<FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); |
| |
| // FIXME: check for constexpr specifier. |
| |
| // C++0x [temp.explicit]p2: |
| // There are two forms of explicit instantiation: an explicit instantiation |
| // definition and an explicit instantiation declaration. An explicit |
| // instantiation declaration begins with the extern keyword. [...] |
| TemplateSpecializationKind TSK |
| = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
| : TSK_ExplicitInstantiationDeclaration; |
| |
| LookupResult Previous(*this, NameInfo, LookupOrdinaryName); |
| LookupParsedName(Previous, S, &D.getCXXScopeSpec()); |
| |
| if (!R->isFunctionType()) { |
| // C++ [temp.explicit]p1: |
| // A [...] static data member of a class template can be explicitly |
| // instantiated from the member definition associated with its class |
| // template. |
| if (Previous.isAmbiguous()) |
| return true; |
| |
| VarDecl *Prev = Previous.getAsSingle<VarDecl>(); |
| if (!Prev || !Prev->isStaticDataMember()) { |
| // We expect to see a data data member here. |
| Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known) |
| << Name; |
| for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); |
| P != PEnd; ++P) |
| Diag((*P)->getLocation(), diag::note_explicit_instantiation_here); |
| return true; |
| } |
| |
| if (!Prev->getInstantiatedFromStaticDataMember()) { |
| // FIXME: Check for explicit specialization? |
| Diag(D.getIdentifierLoc(), |
| diag::err_explicit_instantiation_data_member_not_instantiated) |
| << Prev; |
| Diag(Prev->getLocation(), diag::note_explicit_instantiation_here); |
| // FIXME: Can we provide a note showing where this was declared? |
| return true; |
| } |
| |
| // C++0x [temp.explicit]p2: |
| // If the explicit instantiation is for a member function, a member class |
| // or a static data member of a class template specialization, the name of |
| // the class template specialization in the qualified-id for the member |
| // name shall be a simple-template-id. |
| // |
| // C++98 has the same restriction, just worded differently. |
| if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec())) |
| Diag(D.getIdentifierLoc(), |
| diag::ext_explicit_instantiation_without_qualified_id) |
| << Prev << D.getCXXScopeSpec().getRange(); |
| |
| // Check the scope of this explicit instantiation. |
| CheckExplicitInstantiationScope(*this, Prev, D.getIdentifierLoc(), true); |
| |
| // Verify that it is okay to explicitly instantiate here. |
| MemberSpecializationInfo *MSInfo = Prev->getMemberSpecializationInfo(); |
| assert(MSInfo && "Missing static data member specialization info?"); |
| bool HasNoEffect = false; |
| if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev, |
| MSInfo->getTemplateSpecializationKind(), |
| MSInfo->getPointOfInstantiation(), |
| HasNoEffect)) |
| return true; |
| if (HasNoEffect) |
| return (Decl*) 0; |
| |
| // Instantiate static data member. |
| Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); |
| if (TSK == TSK_ExplicitInstantiationDefinition) |
| InstantiateStaticDataMemberDefinition(D.getIdentifierLoc(), Prev); |
| |
| // FIXME: Create an ExplicitInstantiation node? |
| return (Decl*) 0; |
| } |
| |
| // If the declarator is a template-id, translate the parser's template |
| // argument list into our AST format. |
| bool HasExplicitTemplateArgs = false; |
| TemplateArgumentListInfo TemplateArgs; |
| if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { |
| TemplateIdAnnotation *TemplateId = D.getName().TemplateId; |
| TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); |
| TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); |
| ASTTemplateArgsPtr TemplateArgsPtr(*this, |
| TemplateId->getTemplateArgs(), |
| TemplateId->NumArgs); |
| translateTemplateArguments(TemplateArgsPtr, TemplateArgs); |
| HasExplicitTemplateArgs = true; |
| TemplateArgsPtr.release(); |
| } |
| |
| // C++ [temp.explicit]p1: |
| // A [...] function [...] can be explicitly instantiated from its template. |
| // A member function [...] of a class template can be explicitly |
| // instantiated from the member definition associated with its class |
| // template. |
| UnresolvedSet<8> Matches; |
| for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); |
| P != PEnd; ++P) { |
| NamedDecl *Prev = *P; |
| if (!HasExplicitTemplateArgs) { |
| if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) { |
| if (Context.hasSameUnqualifiedType(Method->getType(), R)) { |
| Matches.clear(); |
| |
| Matches.addDecl(Method, P.getAccess()); |
| if (Method->getTemplateSpecializationKind() == TSK_Undeclared) |
| break; |
| } |
| } |
| } |
| |
| FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev); |
| if (!FunTmpl) |
| continue; |
| |
| TemplateDeductionInfo Info(Context, D.getIdentifierLoc()); |
| FunctionDecl *Specialization = 0; |
| if (TemplateDeductionResult TDK |
| = DeduceTemplateArguments(FunTmpl, |
| (HasExplicitTemplateArgs ? &TemplateArgs : 0), |
| R, Specialization, Info)) { |
| // FIXME: Keep track of almost-matches? |
| (void)TDK; |
| continue; |
| } |
| |
| Matches.addDecl(Specialization, P.getAccess()); |
| } |
| |
| // Find the most specialized function template specialization. |
| UnresolvedSetIterator Result |
| = getMostSpecialized(Matches.begin(), Matches.end(), TPOC_Other, 0, |
| D.getIdentifierLoc(), |
| PDiag(diag::err_explicit_instantiation_not_known) << Name, |
| PDiag(diag::err_explicit_instantiation_ambiguous) << Name, |
| PDiag(diag::note_explicit_instantiation_candidate)); |
| |
| if (Result == Matches.end()) |
| return true; |
| |
| // Ignore access control bits, we don't need them for redeclaration checking. |
| FunctionDecl *Specialization = cast<FunctionDecl>(*Result); |
| |
| if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) { |
| Diag(D.getIdentifierLoc(), |
| diag::err_explicit_instantiation_member_function_not_instantiated) |
| << Specialization |
| << (Specialization->getTemplateSpecializationKind() == |
| TSK_ExplicitSpecialization); |
| Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here); |
| return true; |
| } |
| |
| FunctionDecl *PrevDecl = Specialization->getPreviousDeclaration(); |
| if (!PrevDecl && Specialization->isThisDeclarationADefinition()) |
| PrevDecl = Specialization; |
| |
| if (PrevDecl) { |
| bool HasNoEffect = false; |
| if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, |
| PrevDecl, |
| PrevDecl->getTemplateSpecializationKind(), |
| PrevDecl->getPointOfInstantiation(), |
| HasNoEffect)) |
| return true; |
| |
| // FIXME: We may still want to build some representation of this |
| // explicit specialization. |
| if (HasNoEffect) |
| return (Decl*) 0; |
| } |
| |
| Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); |
| |
| if (TSK == TSK_ExplicitInstantiationDefinition) |
| InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization); |
| |
| // C++0x [temp.explicit]p2: |
| // If the explicit instantiation is for a member function, a member class |
| // or a static data member of a class template specialization, the name of |
| // the class template specialization in the qualified-id for the member |
| // name shall be a simple-template-id. |
| // |
| // C++98 has the same restriction, just worded differently. |
| FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate(); |
| if (D.getName().getKind() != UnqualifiedId::IK_TemplateId && !FunTmpl && |
| D.getCXXScopeSpec().isSet() && |
| !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec())) |
| Diag(D.getIdentifierLoc(), |
| diag::ext_explicit_instantiation_without_qualified_id) |
| << Specialization << D.getCXXScopeSpec().getRange(); |
| |
| CheckExplicitInstantiationScope(*this, |
| FunTmpl? (NamedDecl *)FunTmpl |
| : Specialization->getInstantiatedFromMemberFunction(), |
| D.getIdentifierLoc(), |
| D.getCXXScopeSpec().isSet()); |
| |
| // FIXME: Create some kind of ExplicitInstantiationDecl here. |
| return (Decl*) 0; |
| } |
| |
| TypeResult |
| Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK, |
| const CXXScopeSpec &SS, IdentifierInfo *Name, |
| SourceLocation TagLoc, SourceLocation NameLoc) { |
| // This has to hold, because SS is expected to be defined. |
| assert(Name && "Expected a name in a dependent tag"); |
| |
| NestedNameSpecifier *NNS |
| = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); |
| if (!NNS) |
| return true; |
| |
| TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| |
| if (TUK == TUK_Declaration || TUK == TUK_Definition) { |
| Diag(NameLoc, diag::err_dependent_tag_decl) |
| << (TUK == TUK_Definition) << Kind << SS.getRange(); |
| return true; |
| } |
| |
| // Create the resulting type. |
| ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
| QualType Result = Context.getDependentNameType(Kwd, NNS, Name); |
| |
| // Create type-source location information for this type. |
| TypeLocBuilder TLB; |
| DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result); |
| TL.setKeywordLoc(TagLoc); |
| TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| TL.setNameLoc(NameLoc); |
| return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
| } |
| |
| TypeResult |
| Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc, |
| const CXXScopeSpec &SS, const IdentifierInfo &II, |
| SourceLocation IdLoc) { |
| if (SS.isInvalid()) |
| return true; |
| |
| if (TypenameLoc.isValid() && S && !S->getTemplateParamParent() && |
| !getLangOptions().CPlusPlus0x) |
| Diag(TypenameLoc, diag::ext_typename_outside_of_template) |
| << FixItHint::CreateRemoval(TypenameLoc); |
| |
| NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
| QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None, |
| TypenameLoc, QualifierLoc, II, IdLoc); |
| if (T.isNull()) |
| return true; |
| |
| TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); |
| if (isa<DependentNameType>(T)) { |
| DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); |
| TL.setKeywordLoc(TypenameLoc); |
| TL.setQualifierLoc(QualifierLoc); |
| TL.setNameLoc(IdLoc); |
| } else { |
| ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); |
| TL.setKeywordLoc(TypenameLoc); |
| TL.setQualifierLoc(QualifierLoc); |
| cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(IdLoc); |
| } |
| |
| return CreateParsedType(T, TSI); |
| } |
| |
| TypeResult |
| Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc, |
| const CXXScopeSpec &SS, |
| SourceLocation TemplateLoc, |
| TemplateTy TemplateIn, |
| SourceLocation TemplateNameLoc, |
| SourceLocation LAngleLoc, |
| ASTTemplateArgsPtr TemplateArgsIn, |
| SourceLocation RAngleLoc) { |
| if (TypenameLoc.isValid() && S && !S->getTemplateParamParent() && |
| !getLangOptions().CPlusPlus0x) |
| Diag(TypenameLoc, diag::ext_typename_outside_of_template) |
| << FixItHint::CreateRemoval(TypenameLoc); |
| |
| // Translate the parser's template argument list in our AST format. |
| TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| |
| TemplateName Template = TemplateIn.get(); |
| if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
| // Construct a dependent template specialization type. |
| assert(DTN && "dependent template has non-dependent name?"); |
| assert(DTN->getQualifier() |
| == static_cast<NestedNameSpecifier*>(SS.getScopeRep())); |
| QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename, |
| DTN->getQualifier(), |
| DTN->getIdentifier(), |
| TemplateArgs); |
| |
| // Create source-location information for this type. |
| TypeLocBuilder Builder; |
| DependentTemplateSpecializationTypeLoc SpecTL |
| = Builder.push<DependentTemplateSpecializationTypeLoc>(T); |
| SpecTL.setLAngleLoc(LAngleLoc); |
| SpecTL.setRAngleLoc(RAngleLoc); |
| SpecTL.setKeywordLoc(TypenameLoc); |
| SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| SpecTL.setNameLoc(TemplateNameLoc); |
| for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
| SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); |
| } |
| |
| QualType T = CheckTemplateIdType(Template, TemplateNameLoc, TemplateArgs); |
| if (T.isNull()) |
| return true; |
| |
| // Provide source-location information for the template specialization |
| // type. |
| TypeLocBuilder Builder; |
| TemplateSpecializationTypeLoc SpecTL |
| = Builder.push<TemplateSpecializationTypeLoc>(T); |
| |
| // FIXME: No place to set the location of the 'template' keyword! |
| SpecTL.setLAngleLoc(LAngleLoc); |
| SpecTL.setRAngleLoc(RAngleLoc); |
| SpecTL.setTemplateNameLoc(TemplateNameLoc); |
| for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
| SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| |
| T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T); |
| ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T); |
| TL.setKeywordLoc(TypenameLoc); |
| TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| |
| TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T); |
| return CreateParsedType(T, TSI); |
| } |
| |
| |
| /// \brief Build the type that describes a C++ typename specifier, |
| /// e.g., "typename T::type". |
| QualType |
| Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword, |
| SourceLocation KeywordLoc, |
| NestedNameSpecifierLoc QualifierLoc, |
| const IdentifierInfo &II, |
| SourceLocation IILoc) { |
| CXXScopeSpec SS; |
| SS.Adopt(QualifierLoc); |
| |
| DeclContext *Ctx = computeDeclContext(SS); |
| if (!Ctx) { |
| // If the nested-name-specifier is dependent and couldn't be |
| // resolved to a type, build a typename type. |
| assert(QualifierLoc.getNestedNameSpecifier()->isDependent()); |
| return Context.getDependentNameType(Keyword, |
| QualifierLoc.getNestedNameSpecifier(), |
| &II); |
| } |
| |
| // If the nested-name-specifier refers to the current instantiation, |
| // the "typename" keyword itself is superfluous. In C++03, the |
| // program is actually ill-formed. However, DR 382 (in C++0x CD1) |
| // allows such extraneous "typename" keywords, and we retroactively |
| // apply this DR to C++03 code with only a warning. In any case we continue. |
| |
| if (RequireCompleteDeclContext(SS, Ctx)) |
| return QualType(); |
| |
| DeclarationName Name(&II); |
| LookupResult Result(*this, Name, IILoc, LookupOrdinaryName); |
| LookupQualifiedName(Result, Ctx); |
| unsigned DiagID = 0; |
| Decl *Referenced = 0; |
| switch (Result.getResultKind()) { |
| case LookupResult::NotFound: |
| DiagID = diag::err_typename_nested_not_found; |
| break; |
| |
| case LookupResult::FoundUnresolvedValue: { |
| // We found a using declaration that is a value. Most likely, the using |
| // declaration itself is meant to have the 'typename' keyword. |
| SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), |
| IILoc); |
| Diag(IILoc, diag::err_typename_refers_to_using_value_decl) |
| << Name << Ctx << FullRange; |
| if (UnresolvedUsingValueDecl *Using |
| = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){ |
| SourceLocation Loc = Using->getQualifierLoc().getBeginLoc(); |
| Diag(Loc, diag::note_using_value_decl_missing_typename) |
| << FixItHint::CreateInsertion(Loc, "typename "); |
| } |
| } |
| // Fall through to create a dependent typename type, from which we can recover |
| // better. |
| |
| case LookupResult::NotFoundInCurrentInstantiation: |
| // Okay, it's a member of an unknown instantiation. |
| return Context.getDependentNameType(Keyword, |
| QualifierLoc.getNestedNameSpecifier(), |
| &II); |
| |
| case LookupResult::Found: |
| if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) { |
| // We found a type. Build an ElaboratedType, since the |
| // typename-specifier was just sugar. |
| return Context.getElaboratedType(ETK_Typename, |
| QualifierLoc.getNestedNameSpecifier(), |
| Context.getTypeDeclType(Type)); |
| } |
| |
| DiagID = diag::err_typename_nested_not_type; |
| Referenced = Result.getFoundDecl(); |
| break; |
| |
| |
| llvm_unreachable("unresolved using decl in non-dependent context"); |
| return QualType(); |
| |
| case LookupResult::FoundOverloaded: |
| DiagID = diag::err_typename_nested_not_type; |
| Referenced = *Result.begin(); |
| break; |
| |
| case LookupResult::Ambiguous: |
| return QualType(); |
| } |
| |
| // If we get here, it's because name lookup did not find a |
| // type. Emit an appropriate diagnostic and return an error. |
| SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), |
| IILoc); |
| Diag(IILoc, DiagID) << FullRange << Name << Ctx; |
| if (Referenced) |
| Diag(Referenced->getLocation(), diag::note_typename_refers_here) |
| << Name; |
| return QualType(); |
| } |
| |
| namespace { |
| // See Sema::RebuildTypeInCurrentInstantiation |
| class CurrentInstantiationRebuilder |
| : public TreeTransform<CurrentInstantiationRebuilder> { |
| SourceLocation Loc; |
| DeclarationName Entity; |
| |
| public: |
| typedef TreeTransform<CurrentInstantiationRebuilder> inherited; |
| |
| CurrentInstantiationRebuilder(Sema &SemaRef, |
| SourceLocation Loc, |
| DeclarationName Entity) |
| : TreeTransform<CurrentInstantiationRebuilder>(SemaRef), |
| Loc(Loc), Entity(Entity) { } |
| |
| /// \brief Determine whether the given type \p T has already been |
| /// transformed. |
| /// |
| /// For the purposes of type reconstruction, 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 whose type is being |
| /// rebuilt. |
| SourceLocation getBaseLocation() { return Loc; } |
| |
| /// \brief Returns the name of the entity whose type is being rebuilt. |
| 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 Rebuilds a type within the context of the current instantiation. |
| /// |
| /// The type \p T is part of the type of an out-of-line member definition of |
| /// a class template (or class template partial specialization) that was parsed |
| /// and constructed before we entered the scope of the class template (or |
| /// partial specialization thereof). This routine will rebuild that type now |
| /// that we have entered the declarator's scope, which may produce different |
| /// canonical types, e.g., |
| /// |
| /// \code |
| /// template<typename T> |
| /// struct X { |
| /// typedef T* pointer; |
| /// pointer data(); |
| /// }; |
| /// |
| /// template<typename T> |
| /// typename X<T>::pointer X<T>::data() { ... } |
| /// \endcode |
| /// |
| /// Here, the type "typename X<T>::pointer" will be created as a DependentNameType, |
| /// since we do not know that we can look into X<T> when we parsed the type. |
| /// This function will rebuild the type, performing the lookup of "pointer" |
| /// in X<T> and returning an ElaboratedType whose canonical type is the same |
| /// as the canonical type of T*, allowing the return types of the out-of-line |
| /// definition and the declaration to match. |
| TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T, |
| SourceLocation Loc, |
| DeclarationName Name) { |
| if (!T || !T->getType()->isDependentType()) |
| return T; |
| |
| CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name); |
| return Rebuilder.TransformType(T); |
| } |
| |
| ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) { |
| CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(), |
| DeclarationName()); |
| return Rebuilder.TransformExpr(E); |
| } |
| |
| bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) { |
| if (SS.isInvalid()) |
| return true; |
| |
| NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
| CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(), |
| DeclarationName()); |
| NestedNameSpecifierLoc Rebuilt |
| = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc); |
| if (!Rebuilt) |
| return true; |
| |
| SS.Adopt(Rebuilt); |
| return false; |
| } |
| |
| /// \brief Produces a formatted string that describes the binding of |
| /// template parameters to template arguments. |
| std::string |
| Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, |
| const TemplateArgumentList &Args) { |
| return getTemplateArgumentBindingsText(Params, Args.data(), Args.size()); |
| } |
| |
| std::string |
| Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, |
| const TemplateArgument *Args, |
| unsigned NumArgs) { |
| llvm::SmallString<128> Str; |
| llvm::raw_svector_ostream Out(Str); |
| |
| if (!Params || Params->size() == 0 || NumArgs == 0) |
| return std::string(); |
| |
| for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
| if (I >= NumArgs) |
| break; |
| |
| if (I == 0) |
| Out << "[with "; |
| else |
| Out << ", "; |
| |
| if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) { |
| Out << Id->getName(); |
| } else { |
| Out << '$' << I; |
| } |
| |
| Out << " = "; |
| Args[I].print(Context.PrintingPolicy, Out); |
| } |
| |
| Out << ']'; |
| return Out.str(); |
| } |
| |
| void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, bool Flag) { |
| if (!FD) |
| return; |
| FD->setLateTemplateParsed(Flag); |
| } |
| |
| bool Sema::IsInsideALocalClassWithinATemplateFunction() { |
| DeclContext *DC = CurContext; |
| |
| while (DC) { |
| if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { |
| const FunctionDecl *FD = RD->isLocalClass(); |
| return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate); |
| } else if (DC->isTranslationUnit() || DC->isNamespace()) |
| return false; |
| |
| DC = DC->getParent(); |
| } |
| return false; |
| } |