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ce4aada6e2
Reapplies #92957, fixing an instance where the `template` keyword was missing prior to a dependent name in `llvm/ADT/ArrayRef.h`. An _alias-declaration_ is used to work around a bug affecting GCC releases before 11.1 (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94799) which rejects the use of the `template` keyword prior to the _nested-name-specifier_ in the class member access.
1037 lines
39 KiB
C++
1037 lines
39 KiB
C++
//===--- SemaCXXScopeSpec.cpp - Semantic Analysis for C++ scope specifiers-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements C++ semantic analysis for scope specifiers.
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//
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//===----------------------------------------------------------------------===//
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#include "TypeLocBuilder.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/NestedNameSpecifier.h"
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#include "clang/Basic/PartialDiagnostic.h"
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#include "clang/Sema/DeclSpec.h"
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#include "clang/Sema/Lookup.h"
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#include "clang/Sema/SemaInternal.h"
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#include "clang/Sema/Template.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace clang;
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/// Find the current instantiation that associated with the given type.
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static CXXRecordDecl *getCurrentInstantiationOf(QualType T,
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DeclContext *CurContext) {
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if (T.isNull())
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return nullptr;
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const Type *Ty = T->getCanonicalTypeInternal().getTypePtr();
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if (const RecordType *RecordTy = dyn_cast<RecordType>(Ty)) {
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CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordTy->getDecl());
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if (!Record->isDependentContext() ||
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Record->isCurrentInstantiation(CurContext))
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return Record;
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return nullptr;
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} else if (isa<InjectedClassNameType>(Ty))
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return cast<InjectedClassNameType>(Ty)->getDecl();
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else
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return nullptr;
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}
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DeclContext *Sema::computeDeclContext(QualType T) {
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if (!T->isDependentType())
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if (const TagType *Tag = T->getAs<TagType>())
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return Tag->getDecl();
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return ::getCurrentInstantiationOf(T, CurContext);
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}
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DeclContext *Sema::computeDeclContext(const CXXScopeSpec &SS,
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bool EnteringContext) {
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if (!SS.isSet() || SS.isInvalid())
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return nullptr;
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NestedNameSpecifier *NNS = SS.getScopeRep();
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if (NNS->isDependent()) {
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// If this nested-name-specifier refers to the current
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// instantiation, return its DeclContext.
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if (CXXRecordDecl *Record = getCurrentInstantiationOf(NNS))
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return Record;
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if (EnteringContext) {
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const Type *NNSType = NNS->getAsType();
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if (!NNSType) {
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return nullptr;
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}
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// Look through type alias templates, per C++0x [temp.dep.type]p1.
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NNSType = Context.getCanonicalType(NNSType);
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if (const TemplateSpecializationType *SpecType
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= NNSType->getAs<TemplateSpecializationType>()) {
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// We are entering the context of the nested name specifier, so try to
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// match the nested name specifier to either a primary class template
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// or a class template partial specialization.
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if (ClassTemplateDecl *ClassTemplate
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= dyn_cast_or_null<ClassTemplateDecl>(
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SpecType->getTemplateName().getAsTemplateDecl())) {
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QualType ContextType =
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Context.getCanonicalType(QualType(SpecType, 0));
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// FIXME: The fallback on the search of partial
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// specialization using ContextType should be eventually removed since
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// it doesn't handle the case of constrained template parameters
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// correctly. Currently removing this fallback would change the
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// diagnostic output for invalid code in a number of tests.
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ClassTemplatePartialSpecializationDecl *PartialSpec = nullptr;
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ArrayRef<TemplateParameterList *> TemplateParamLists =
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SS.getTemplateParamLists();
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if (!TemplateParamLists.empty()) {
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unsigned Depth = ClassTemplate->getTemplateParameters()->getDepth();
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auto L = find_if(TemplateParamLists,
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[Depth](TemplateParameterList *TPL) {
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return TPL->getDepth() == Depth;
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});
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if (L != TemplateParamLists.end()) {
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void *Pos = nullptr;
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PartialSpec = ClassTemplate->findPartialSpecialization(
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SpecType->template_arguments(), *L, Pos);
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}
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} else {
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PartialSpec = ClassTemplate->findPartialSpecialization(ContextType);
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}
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if (PartialSpec) {
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// A declaration of the partial specialization must be visible.
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// We can always recover here, because this only happens when we're
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// entering the context, and that can't happen in a SFINAE context.
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assert(!isSFINAEContext() && "partial specialization scope "
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"specifier in SFINAE context?");
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if (PartialSpec->hasDefinition() &&
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!hasReachableDefinition(PartialSpec))
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diagnoseMissingImport(SS.getLastQualifierNameLoc(), PartialSpec,
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MissingImportKind::PartialSpecialization,
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true);
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return PartialSpec;
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}
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// If the type of the nested name specifier is the same as the
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// injected class name of the named class template, we're entering
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// into that class template definition.
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QualType Injected =
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ClassTemplate->getInjectedClassNameSpecialization();
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if (Context.hasSameType(Injected, ContextType))
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return ClassTemplate->getTemplatedDecl();
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}
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} else if (const RecordType *RecordT = NNSType->getAs<RecordType>()) {
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// The nested name specifier refers to a member of a class template.
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return RecordT->getDecl();
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}
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}
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return nullptr;
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}
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switch (NNS->getKind()) {
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case NestedNameSpecifier::Identifier:
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llvm_unreachable("Dependent nested-name-specifier has no DeclContext");
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case NestedNameSpecifier::Namespace:
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return NNS->getAsNamespace();
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case NestedNameSpecifier::NamespaceAlias:
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return NNS->getAsNamespaceAlias()->getNamespace();
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case NestedNameSpecifier::TypeSpec:
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case NestedNameSpecifier::TypeSpecWithTemplate: {
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const TagType *Tag = NNS->getAsType()->getAs<TagType>();
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assert(Tag && "Non-tag type in nested-name-specifier");
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return Tag->getDecl();
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}
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case NestedNameSpecifier::Global:
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return Context.getTranslationUnitDecl();
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case NestedNameSpecifier::Super:
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return NNS->getAsRecordDecl();
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}
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llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
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}
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bool Sema::isDependentScopeSpecifier(const CXXScopeSpec &SS) {
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if (!SS.isSet() || SS.isInvalid())
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return false;
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return SS.getScopeRep()->isDependent();
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}
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CXXRecordDecl *Sema::getCurrentInstantiationOf(NestedNameSpecifier *NNS) {
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assert(getLangOpts().CPlusPlus && "Only callable in C++");
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assert(NNS->isDependent() && "Only dependent nested-name-specifier allowed");
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if (!NNS->getAsType())
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return nullptr;
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QualType T = QualType(NNS->getAsType(), 0);
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return ::getCurrentInstantiationOf(T, CurContext);
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}
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/// Require that the context specified by SS be complete.
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///
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/// If SS refers to a type, this routine checks whether the type is
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/// complete enough (or can be made complete enough) for name lookup
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/// into the DeclContext. A type that is not yet completed can be
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/// considered "complete enough" if it is a class/struct/union/enum
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/// that is currently being defined. Or, if we have a type that names
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/// a class template specialization that is not a complete type, we
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/// will attempt to instantiate that class template.
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bool Sema::RequireCompleteDeclContext(CXXScopeSpec &SS,
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DeclContext *DC) {
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assert(DC && "given null context");
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TagDecl *tag = dyn_cast<TagDecl>(DC);
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// If this is a dependent type, then we consider it complete.
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// FIXME: This is wrong; we should require a (visible) definition to
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// exist in this case too.
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if (!tag || tag->isDependentContext())
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return false;
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// Grab the tag definition, if there is one.
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QualType type = Context.getTypeDeclType(tag);
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tag = type->getAsTagDecl();
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// If we're currently defining this type, then lookup into the
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// type is okay: don't complain that it isn't complete yet.
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if (tag->isBeingDefined())
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return false;
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SourceLocation loc = SS.getLastQualifierNameLoc();
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if (loc.isInvalid()) loc = SS.getRange().getBegin();
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// The type must be complete.
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if (RequireCompleteType(loc, type, diag::err_incomplete_nested_name_spec,
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SS.getRange())) {
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SS.SetInvalid(SS.getRange());
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return true;
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}
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if (auto *EnumD = dyn_cast<EnumDecl>(tag))
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// Fixed enum types and scoped enum instantiations are complete, but they
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// aren't valid as scopes until we see or instantiate their definition.
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return RequireCompleteEnumDecl(EnumD, loc, &SS);
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return false;
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}
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/// Require that the EnumDecl is completed with its enumerators defined or
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/// instantiated. SS, if provided, is the ScopeRef parsed.
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///
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bool Sema::RequireCompleteEnumDecl(EnumDecl *EnumD, SourceLocation L,
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CXXScopeSpec *SS) {
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if (EnumD->isCompleteDefinition()) {
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// If we know about the definition but it is not visible, complain.
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NamedDecl *SuggestedDef = nullptr;
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if (!hasReachableDefinition(EnumD, &SuggestedDef,
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/*OnlyNeedComplete*/ false)) {
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// If the user is going to see an error here, recover by making the
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// definition visible.
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bool TreatAsComplete = !isSFINAEContext();
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diagnoseMissingImport(L, SuggestedDef, MissingImportKind::Definition,
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/*Recover*/ TreatAsComplete);
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return !TreatAsComplete;
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}
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return false;
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}
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// Try to instantiate the definition, if this is a specialization of an
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// enumeration temploid.
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if (EnumDecl *Pattern = EnumD->getInstantiatedFromMemberEnum()) {
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MemberSpecializationInfo *MSI = EnumD->getMemberSpecializationInfo();
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if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) {
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if (InstantiateEnum(L, EnumD, Pattern,
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getTemplateInstantiationArgs(EnumD),
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TSK_ImplicitInstantiation)) {
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if (SS)
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SS->SetInvalid(SS->getRange());
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return true;
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}
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return false;
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}
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}
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if (SS) {
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Diag(L, diag::err_incomplete_nested_name_spec)
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<< QualType(EnumD->getTypeForDecl(), 0) << SS->getRange();
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SS->SetInvalid(SS->getRange());
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} else {
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Diag(L, diag::err_incomplete_enum) << QualType(EnumD->getTypeForDecl(), 0);
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Diag(EnumD->getLocation(), diag::note_declared_at);
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}
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return true;
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}
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bool Sema::ActOnCXXGlobalScopeSpecifier(SourceLocation CCLoc,
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CXXScopeSpec &SS) {
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SS.MakeGlobal(Context, CCLoc);
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return false;
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}
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bool Sema::ActOnSuperScopeSpecifier(SourceLocation SuperLoc,
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SourceLocation ColonColonLoc,
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CXXScopeSpec &SS) {
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if (getCurLambda()) {
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Diag(SuperLoc, diag::err_super_in_lambda_unsupported);
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return true;
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}
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CXXRecordDecl *RD = nullptr;
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for (Scope *S = getCurScope(); S; S = S->getParent()) {
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if (S->isFunctionScope()) {
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if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(S->getEntity()))
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RD = MD->getParent();
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break;
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}
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if (S->isClassScope()) {
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RD = cast<CXXRecordDecl>(S->getEntity());
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break;
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}
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}
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if (!RD) {
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Diag(SuperLoc, diag::err_invalid_super_scope);
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return true;
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} else if (RD->getNumBases() == 0) {
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Diag(SuperLoc, diag::err_no_base_classes) << RD->getName();
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return true;
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}
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SS.MakeSuper(Context, RD, SuperLoc, ColonColonLoc);
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return false;
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}
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bool Sema::isAcceptableNestedNameSpecifier(const NamedDecl *SD,
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bool *IsExtension) {
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if (!SD)
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return false;
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SD = SD->getUnderlyingDecl();
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// Namespace and namespace aliases are fine.
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if (isa<NamespaceDecl>(SD))
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return true;
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if (!isa<TypeDecl>(SD))
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return false;
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// Determine whether we have a class (or, in C++11, an enum) or
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// a typedef thereof. If so, build the nested-name-specifier.
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QualType T = Context.getTypeDeclType(cast<TypeDecl>(SD));
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if (T->isDependentType())
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return true;
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if (const TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
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if (TD->getUnderlyingType()->isRecordType())
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return true;
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if (TD->getUnderlyingType()->isEnumeralType()) {
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if (Context.getLangOpts().CPlusPlus11)
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return true;
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if (IsExtension)
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*IsExtension = true;
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}
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} else if (isa<RecordDecl>(SD)) {
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return true;
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} else if (isa<EnumDecl>(SD)) {
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if (Context.getLangOpts().CPlusPlus11)
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return true;
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if (IsExtension)
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*IsExtension = true;
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}
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return false;
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}
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/// If the given nested-name-specifier begins with a bare identifier
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/// (e.g., Base::), perform name lookup for that identifier as a
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/// nested-name-specifier within the given scope, and return the result of that
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/// name lookup.
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bool Sema::LookupFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS,
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UnresolvedSetImpl &R) {
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if (!S)
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return false;
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while (NNS->getPrefix())
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NNS = NNS->getPrefix();
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// FIXME: This is a rather nasty hack! Ideally we should get the results
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// from LookupTemplateName/BuildCXXNestedNameSpecifier.
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const IdentifierInfo *II = NNS->getAsIdentifier();
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if (!II) {
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if (const auto *DTST =
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dyn_cast_if_present<DependentTemplateSpecializationType>(
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NNS->getAsType()))
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II = DTST->getIdentifier();
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else
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return false;
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}
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assert(II && "Missing first qualifier in scope");
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LookupResult Found(*this, II, SourceLocation(),
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NNS->getAsIdentifier() ? LookupNestedNameSpecifierName
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: LookupOrdinaryName);
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LookupName(Found, S);
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if (Found.empty())
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return false;
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R.addAllDecls(Found.asUnresolvedSet().pairs());
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Found.suppressDiagnostics();
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return true;
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}
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namespace {
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// Callback to only accept typo corrections that can be a valid C++ member
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// initializer: either a non-static field member or a base class.
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class NestedNameSpecifierValidatorCCC final
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: public CorrectionCandidateCallback {
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public:
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explicit NestedNameSpecifierValidatorCCC(Sema &SRef)
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: SRef(SRef) {}
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bool ValidateCandidate(const TypoCorrection &candidate) override {
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return SRef.isAcceptableNestedNameSpecifier(candidate.getCorrectionDecl());
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}
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std::unique_ptr<CorrectionCandidateCallback> clone() override {
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return std::make_unique<NestedNameSpecifierValidatorCCC>(*this);
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}
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private:
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Sema &SRef;
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};
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}
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bool Sema::BuildCXXNestedNameSpecifier(Scope *S, NestedNameSpecInfo &IdInfo,
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bool EnteringContext, CXXScopeSpec &SS,
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bool ErrorRecoveryLookup,
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bool *IsCorrectedToColon,
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bool OnlyNamespace) {
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if (IdInfo.Identifier->isEditorPlaceholder())
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return true;
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if (IsCorrectedToColon)
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*IsCorrectedToColon = false;
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QualType ObjectType = GetTypeFromParser(IdInfo.ObjectType);
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LookupResult Found(*this, IdInfo.Identifier, IdInfo.IdentifierLoc,
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OnlyNamespace ? LookupNamespaceName
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: LookupNestedNameSpecifierName);
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// C++ [basic.lookup.qual.general]p3:
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// Qualified name lookup in a class, namespace, or enumeration performs a
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// search of the scope associated with it except as specified below.
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LookupParsedName(Found, S, &SS, ObjectType,
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/*AllowBuiltinCreation=*/false, EnteringContext);
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// C++ [basic.lookup.qual.general]p3:
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// [...] Unless otherwise specified, a qualified name undergoes qualified
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// name lookup in its lookup context from the point where it appears unless
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// the lookup context either is dependent and is not the current
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// instantiation or is not a class or class template.
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if (Found.wasNotFoundInCurrentInstantiation()) {
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// Don't speculate if we're just trying to improve error recovery.
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if (ErrorRecoveryLookup)
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return true;
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// The lookup context is dependent and either:
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// - it is not the current instantiation, or
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// - it is the current instantiation, it has at least one dependent base
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// class, and qualified lookup found nothing.
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// Build a dependent nested-name-specifier. We will lookup the name again
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// during instantiation.
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SS.Extend(Context, IdInfo.Identifier, IdInfo.IdentifierLoc, IdInfo.CCLoc);
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return false;
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}
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bool ObjectTypeSearchedInScope = false;
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// C++ [basic.lookup.qual.general]p2:
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// A member-qualified name is the (unique) component name, if any, of
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// - an unqualified-id or
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// - a nested-name-specifier of the form type-name :: or namespace-name ::
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// in the id-expression of a class member access expression.
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//
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// C++ [basic.lookup.qual.general]p3:
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// [...] If nothing is found by qualified lookup for a member-qualified
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// name that is the terminal name of a nested-name-specifier and is not
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// dependent, it undergoes unqualified lookup.
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//
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// In 'x.A::B::y', 'A' will undergo unqualified lookup if qualified lookup
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// in the type of 'x' finds nothing. If the lookup context is dependent,
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// we perform the unqualified lookup in the template definition context
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// and store the results so we can replicate the lookup during instantiation.
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if (Found.empty() && !ObjectType.isNull()) {
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if (S) {
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LookupName(Found, S);
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} else if (!SS.getUnqualifiedLookups().empty()) {
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Found.addAllDecls(SS.getUnqualifiedLookups());
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Found.resolveKind();
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}
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ObjectTypeSearchedInScope = true;
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}
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if (Found.isAmbiguous())
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return true;
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if (Found.empty() && !ErrorRecoveryLookup) {
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// If identifier is not found as class-name-or-namespace-name, but is found
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// as other entity, don't look for typos.
|
|
LookupResult R(*this, Found.getLookupNameInfo(), LookupOrdinaryName);
|
|
LookupParsedName(R, S, &SS, ObjectType,
|
|
/*AllowBuiltinCreation=*/false, EnteringContext);
|
|
|
|
if (!R.empty()) {
|
|
// Don't diagnose problems with this speculative lookup.
|
|
R.suppressDiagnostics();
|
|
// The identifier is found in ordinary lookup. If correction to colon is
|
|
// allowed, suggest replacement to ':'.
|
|
if (IsCorrectedToColon) {
|
|
*IsCorrectedToColon = true;
|
|
Diag(IdInfo.CCLoc, diag::err_nested_name_spec_is_not_class)
|
|
<< IdInfo.Identifier << getLangOpts().CPlusPlus
|
|
<< FixItHint::CreateReplacement(IdInfo.CCLoc, ":");
|
|
if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
|
|
Diag(ND->getLocation(), diag::note_declared_at);
|
|
return true;
|
|
}
|
|
// Replacement '::' -> ':' is not allowed, just issue respective error.
|
|
Diag(R.getNameLoc(), OnlyNamespace
|
|
? unsigned(diag::err_expected_namespace_name)
|
|
: unsigned(diag::err_expected_class_or_namespace))
|
|
<< IdInfo.Identifier << getLangOpts().CPlusPlus;
|
|
if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
|
|
Diag(ND->getLocation(), diag::note_entity_declared_at)
|
|
<< IdInfo.Identifier;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
DeclContext *LookupCtx =
|
|
SS.isSet()
|
|
? computeDeclContext(SS, EnteringContext)
|
|
: (!ObjectType.isNull() ? computeDeclContext(ObjectType) : nullptr);
|
|
|
|
if (Found.empty() && !ErrorRecoveryLookup && !getLangOpts().MSVCCompat) {
|
|
// We haven't found anything, and we're not recovering from a
|
|
// different kind of error, so look for typos.
|
|
DeclarationName Name = Found.getLookupName();
|
|
Found.clear();
|
|
NestedNameSpecifierValidatorCCC CCC(*this);
|
|
if (TypoCorrection Corrected = CorrectTypo(
|
|
Found.getLookupNameInfo(), Found.getLookupKind(), S, &SS, CCC,
|
|
CTK_ErrorRecovery, LookupCtx, EnteringContext)) {
|
|
if (LookupCtx) {
|
|
bool DroppedSpecifier =
|
|
Corrected.WillReplaceSpecifier() &&
|
|
Name.getAsString() == Corrected.getAsString(getLangOpts());
|
|
if (DroppedSpecifier)
|
|
SS.clear();
|
|
diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest)
|
|
<< Name << LookupCtx << DroppedSpecifier
|
|
<< SS.getRange());
|
|
} else
|
|
diagnoseTypo(Corrected, PDiag(diag::err_undeclared_var_use_suggest)
|
|
<< Name);
|
|
|
|
if (Corrected.getCorrectionSpecifier())
|
|
SS.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
|
|
SourceRange(Found.getNameLoc()));
|
|
|
|
if (NamedDecl *ND = Corrected.getFoundDecl())
|
|
Found.addDecl(ND);
|
|
Found.setLookupName(Corrected.getCorrection());
|
|
} else {
|
|
Found.setLookupName(IdInfo.Identifier);
|
|
}
|
|
}
|
|
|
|
NamedDecl *SD =
|
|
Found.isSingleResult() ? Found.getRepresentativeDecl() : nullptr;
|
|
bool IsExtension = false;
|
|
bool AcceptSpec = isAcceptableNestedNameSpecifier(SD, &IsExtension);
|
|
if (!AcceptSpec && IsExtension) {
|
|
AcceptSpec = true;
|
|
Diag(IdInfo.IdentifierLoc, diag::ext_nested_name_spec_is_enum);
|
|
}
|
|
if (AcceptSpec) {
|
|
if (!ObjectType.isNull() && !ObjectTypeSearchedInScope &&
|
|
!getLangOpts().CPlusPlus11) {
|
|
// C++03 [basic.lookup.classref]p4:
|
|
// [...] If the name is found in both contexts, the
|
|
// class-name-or-namespace-name shall refer to the same entity.
|
|
//
|
|
// We already found the name in the scope of the object. Now, look
|
|
// into the current scope (the scope of the postfix-expression) to
|
|
// see if we can find the same name there. As above, if there is no
|
|
// scope, reconstruct the result from the template instantiation itself.
|
|
//
|
|
// Note that C++11 does *not* perform this redundant lookup.
|
|
NamedDecl *OuterDecl = nullptr;
|
|
if (S) {
|
|
LookupResult FoundOuter(*this, IdInfo.Identifier, IdInfo.IdentifierLoc,
|
|
LookupNestedNameSpecifierName);
|
|
LookupName(FoundOuter, S);
|
|
OuterDecl = FoundOuter.getAsSingle<NamedDecl>();
|
|
} else if (!SS.getUnqualifiedLookups().empty())
|
|
OuterDecl = SS.getUnqualifiedLookups().front().getDecl();
|
|
|
|
if (isAcceptableNestedNameSpecifier(OuterDecl) &&
|
|
OuterDecl->getCanonicalDecl() != SD->getCanonicalDecl() &&
|
|
(!isa<TypeDecl>(OuterDecl) || !isa<TypeDecl>(SD) ||
|
|
!Context.hasSameType(
|
|
Context.getTypeDeclType(cast<TypeDecl>(OuterDecl)),
|
|
Context.getTypeDeclType(cast<TypeDecl>(SD))))) {
|
|
if (ErrorRecoveryLookup)
|
|
return true;
|
|
|
|
Diag(IdInfo.IdentifierLoc,
|
|
diag::err_nested_name_member_ref_lookup_ambiguous)
|
|
<< IdInfo.Identifier;
|
|
Diag(SD->getLocation(), diag::note_ambig_member_ref_object_type)
|
|
<< ObjectType;
|
|
Diag(OuterDecl->getLocation(), diag::note_ambig_member_ref_scope);
|
|
|
|
// Fall through so that we'll pick the name we found in the object
|
|
// type, since that's probably what the user wanted anyway.
|
|
}
|
|
}
|
|
|
|
if (auto *TD = dyn_cast_or_null<TypedefNameDecl>(SD))
|
|
MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
|
|
|
|
// If we're just performing this lookup for error-recovery purposes,
|
|
// don't extend the nested-name-specifier. Just return now.
|
|
if (ErrorRecoveryLookup)
|
|
return false;
|
|
|
|
// The use of a nested name specifier may trigger deprecation warnings.
|
|
DiagnoseUseOfDecl(SD, IdInfo.CCLoc);
|
|
|
|
if (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD)) {
|
|
SS.Extend(Context, Namespace, IdInfo.IdentifierLoc, IdInfo.CCLoc);
|
|
return false;
|
|
}
|
|
|
|
if (NamespaceAliasDecl *Alias = dyn_cast<NamespaceAliasDecl>(SD)) {
|
|
SS.Extend(Context, Alias, IdInfo.IdentifierLoc, IdInfo.CCLoc);
|
|
return false;
|
|
}
|
|
|
|
QualType T =
|
|
Context.getTypeDeclType(cast<TypeDecl>(SD->getUnderlyingDecl()));
|
|
|
|
if (T->isEnumeralType())
|
|
Diag(IdInfo.IdentifierLoc, diag::warn_cxx98_compat_enum_nested_name_spec);
|
|
|
|
TypeLocBuilder TLB;
|
|
if (const auto *USD = dyn_cast<UsingShadowDecl>(SD)) {
|
|
T = Context.getUsingType(USD, T);
|
|
TLB.pushTypeSpec(T).setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<InjectedClassNameType>(T)) {
|
|
InjectedClassNameTypeLoc InjectedTL
|
|
= TLB.push<InjectedClassNameTypeLoc>(T);
|
|
InjectedTL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<RecordType>(T)) {
|
|
RecordTypeLoc RecordTL = TLB.push<RecordTypeLoc>(T);
|
|
RecordTL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<TypedefType>(T)) {
|
|
TypedefTypeLoc TypedefTL = TLB.push<TypedefTypeLoc>(T);
|
|
TypedefTL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<EnumType>(T)) {
|
|
EnumTypeLoc EnumTL = TLB.push<EnumTypeLoc>(T);
|
|
EnumTL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<TemplateTypeParmType>(T)) {
|
|
TemplateTypeParmTypeLoc TemplateTypeTL
|
|
= TLB.push<TemplateTypeParmTypeLoc>(T);
|
|
TemplateTypeTL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<UnresolvedUsingType>(T)) {
|
|
UnresolvedUsingTypeLoc UnresolvedTL
|
|
= TLB.push<UnresolvedUsingTypeLoc>(T);
|
|
UnresolvedTL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<SubstTemplateTypeParmType>(T)) {
|
|
SubstTemplateTypeParmTypeLoc TL
|
|
= TLB.push<SubstTemplateTypeParmTypeLoc>(T);
|
|
TL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else if (isa<SubstTemplateTypeParmPackType>(T)) {
|
|
SubstTemplateTypeParmPackTypeLoc TL
|
|
= TLB.push<SubstTemplateTypeParmPackTypeLoc>(T);
|
|
TL.setNameLoc(IdInfo.IdentifierLoc);
|
|
} else {
|
|
llvm_unreachable("Unhandled TypeDecl node in nested-name-specifier");
|
|
}
|
|
|
|
SS.Extend(Context, SourceLocation(), TLB.getTypeLocInContext(Context, T),
|
|
IdInfo.CCLoc);
|
|
return false;
|
|
}
|
|
|
|
// Otherwise, we have an error case. If we don't want diagnostics, just
|
|
// return an error now.
|
|
if (ErrorRecoveryLookup)
|
|
return true;
|
|
|
|
// If we didn't find anything during our lookup, try again with
|
|
// ordinary name lookup, which can help us produce better error
|
|
// messages.
|
|
if (Found.empty()) {
|
|
Found.clear(LookupOrdinaryName);
|
|
LookupName(Found, S);
|
|
}
|
|
|
|
// In Microsoft mode, if we are within a templated function and we can't
|
|
// resolve Identifier, then extend the SS with Identifier. This will have
|
|
// the effect of resolving Identifier during template instantiation.
|
|
// The goal is to be able to resolve a function call whose
|
|
// nested-name-specifier is located inside a dependent base class.
|
|
// Example:
|
|
//
|
|
// class C {
|
|
// public:
|
|
// static void foo2() { }
|
|
// };
|
|
// template <class T> class A { public: typedef C D; };
|
|
//
|
|
// template <class T> class B : public A<T> {
|
|
// public:
|
|
// void foo() { D::foo2(); }
|
|
// };
|
|
if (getLangOpts().MSVCCompat) {
|
|
DeclContext *DC = LookupCtx ? LookupCtx : CurContext;
|
|
if (DC->isDependentContext() && DC->isFunctionOrMethod()) {
|
|
CXXRecordDecl *ContainingClass = dyn_cast<CXXRecordDecl>(DC->getParent());
|
|
if (ContainingClass && ContainingClass->hasAnyDependentBases()) {
|
|
Diag(IdInfo.IdentifierLoc,
|
|
diag::ext_undeclared_unqual_id_with_dependent_base)
|
|
<< IdInfo.Identifier << ContainingClass;
|
|
// Fake up a nested-name-specifier that starts with the
|
|
// injected-class-name of the enclosing class.
|
|
QualType T = Context.getTypeDeclType(ContainingClass);
|
|
TypeLocBuilder TLB;
|
|
TLB.pushTrivial(Context, T, IdInfo.IdentifierLoc);
|
|
SS.Extend(Context, /*TemplateKWLoc=*/SourceLocation(),
|
|
TLB.getTypeLocInContext(Context, T), IdInfo.IdentifierLoc);
|
|
// Add the identifier to form a dependent name.
|
|
SS.Extend(Context, IdInfo.Identifier, IdInfo.IdentifierLoc,
|
|
IdInfo.CCLoc);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!Found.empty()) {
|
|
if (TypeDecl *TD = Found.getAsSingle<TypeDecl>()) {
|
|
Diag(IdInfo.IdentifierLoc, diag::err_expected_class_or_namespace)
|
|
<< Context.getTypeDeclType(TD) << getLangOpts().CPlusPlus;
|
|
} else if (Found.getAsSingle<TemplateDecl>()) {
|
|
ParsedType SuggestedType;
|
|
DiagnoseUnknownTypeName(IdInfo.Identifier, IdInfo.IdentifierLoc, S, &SS,
|
|
SuggestedType);
|
|
} else {
|
|
Diag(IdInfo.IdentifierLoc, diag::err_expected_class_or_namespace)
|
|
<< IdInfo.Identifier << getLangOpts().CPlusPlus;
|
|
if (NamedDecl *ND = Found.getAsSingle<NamedDecl>())
|
|
Diag(ND->getLocation(), diag::note_entity_declared_at)
|
|
<< IdInfo.Identifier;
|
|
}
|
|
} else if (SS.isSet())
|
|
Diag(IdInfo.IdentifierLoc, diag::err_no_member) << IdInfo.Identifier
|
|
<< LookupCtx << SS.getRange();
|
|
else
|
|
Diag(IdInfo.IdentifierLoc, diag::err_undeclared_var_use)
|
|
<< IdInfo.Identifier;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Sema::ActOnCXXNestedNameSpecifier(Scope *S, NestedNameSpecInfo &IdInfo,
|
|
bool EnteringContext, CXXScopeSpec &SS,
|
|
bool *IsCorrectedToColon,
|
|
bool OnlyNamespace) {
|
|
if (SS.isInvalid())
|
|
return true;
|
|
|
|
return BuildCXXNestedNameSpecifier(S, IdInfo, EnteringContext, SS,
|
|
/*ErrorRecoveryLookup=*/false,
|
|
IsCorrectedToColon, OnlyNamespace);
|
|
}
|
|
|
|
bool Sema::ActOnCXXNestedNameSpecifierDecltype(CXXScopeSpec &SS,
|
|
const DeclSpec &DS,
|
|
SourceLocation ColonColonLoc) {
|
|
if (SS.isInvalid() || DS.getTypeSpecType() == DeclSpec::TST_error)
|
|
return true;
|
|
|
|
assert(DS.getTypeSpecType() == DeclSpec::TST_decltype);
|
|
|
|
QualType T = BuildDecltypeType(DS.getRepAsExpr());
|
|
if (T.isNull())
|
|
return true;
|
|
|
|
if (!T->isDependentType() && !T->getAs<TagType>()) {
|
|
Diag(DS.getTypeSpecTypeLoc(), diag::err_expected_class_or_namespace)
|
|
<< T << getLangOpts().CPlusPlus;
|
|
return true;
|
|
}
|
|
|
|
TypeLocBuilder TLB;
|
|
DecltypeTypeLoc DecltypeTL = TLB.push<DecltypeTypeLoc>(T);
|
|
DecltypeTL.setDecltypeLoc(DS.getTypeSpecTypeLoc());
|
|
DecltypeTL.setRParenLoc(DS.getTypeofParensRange().getEnd());
|
|
SS.Extend(Context, SourceLocation(), TLB.getTypeLocInContext(Context, T),
|
|
ColonColonLoc);
|
|
return false;
|
|
}
|
|
|
|
bool Sema::ActOnCXXNestedNameSpecifierIndexedPack(CXXScopeSpec &SS,
|
|
const DeclSpec &DS,
|
|
SourceLocation ColonColonLoc,
|
|
QualType Type) {
|
|
if (SS.isInvalid() || DS.getTypeSpecType() == DeclSpec::TST_error)
|
|
return true;
|
|
|
|
assert(DS.getTypeSpecType() == DeclSpec::TST_typename_pack_indexing);
|
|
|
|
if (Type.isNull())
|
|
return true;
|
|
|
|
TypeLocBuilder TLB;
|
|
TLB.pushTrivial(getASTContext(),
|
|
cast<PackIndexingType>(Type.getTypePtr())->getPattern(),
|
|
DS.getBeginLoc());
|
|
PackIndexingTypeLoc PIT = TLB.push<PackIndexingTypeLoc>(Type);
|
|
PIT.setEllipsisLoc(DS.getEllipsisLoc());
|
|
SS.Extend(Context, SourceLocation(), TLB.getTypeLocInContext(Context, Type),
|
|
ColonColonLoc);
|
|
return false;
|
|
}
|
|
|
|
bool Sema::IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS,
|
|
NestedNameSpecInfo &IdInfo,
|
|
bool EnteringContext) {
|
|
if (SS.isInvalid())
|
|
return false;
|
|
|
|
return !BuildCXXNestedNameSpecifier(S, IdInfo, EnteringContext, SS,
|
|
/*ErrorRecoveryLookup=*/true);
|
|
}
|
|
|
|
bool Sema::ActOnCXXNestedNameSpecifier(Scope *S,
|
|
CXXScopeSpec &SS,
|
|
SourceLocation TemplateKWLoc,
|
|
TemplateTy OpaqueTemplate,
|
|
SourceLocation TemplateNameLoc,
|
|
SourceLocation LAngleLoc,
|
|
ASTTemplateArgsPtr TemplateArgsIn,
|
|
SourceLocation RAngleLoc,
|
|
SourceLocation CCLoc,
|
|
bool EnteringContext) {
|
|
if (SS.isInvalid())
|
|
return true;
|
|
|
|
TemplateName Template = OpaqueTemplate.get();
|
|
|
|
// Translate the parser's template argument list in our AST format.
|
|
TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc);
|
|
translateTemplateArguments(TemplateArgsIn, TemplateArgs);
|
|
|
|
DependentTemplateName *DTN = Template.getAsDependentTemplateName();
|
|
if (DTN && DTN->isIdentifier()) {
|
|
// Handle a dependent template specialization for which we cannot resolve
|
|
// the template name.
|
|
assert(DTN->getQualifier() == SS.getScopeRep());
|
|
QualType T = Context.getDependentTemplateSpecializationType(
|
|
ElaboratedTypeKeyword::None, DTN->getQualifier(), DTN->getIdentifier(),
|
|
TemplateArgs.arguments());
|
|
|
|
// Create source-location information for this type.
|
|
TypeLocBuilder Builder;
|
|
DependentTemplateSpecializationTypeLoc SpecTL
|
|
= Builder.push<DependentTemplateSpecializationTypeLoc>(T);
|
|
SpecTL.setElaboratedKeywordLoc(SourceLocation());
|
|
SpecTL.setQualifierLoc(SS.getWithLocInContext(Context));
|
|
SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
|
|
SpecTL.setTemplateNameLoc(TemplateNameLoc);
|
|
SpecTL.setLAngleLoc(LAngleLoc);
|
|
SpecTL.setRAngleLoc(RAngleLoc);
|
|
for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
|
|
SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
|
|
|
|
SS.Extend(Context, TemplateKWLoc, Builder.getTypeLocInContext(Context, T),
|
|
CCLoc);
|
|
return false;
|
|
}
|
|
|
|
// If we assumed an undeclared identifier was a template name, try to
|
|
// typo-correct it now.
|
|
if (Template.getAsAssumedTemplateName() &&
|
|
resolveAssumedTemplateNameAsType(S, Template, TemplateNameLoc))
|
|
return true;
|
|
|
|
TemplateDecl *TD = Template.getAsTemplateDecl();
|
|
if (Template.getAsOverloadedTemplate() || DTN ||
|
|
isa<FunctionTemplateDecl>(TD) || isa<VarTemplateDecl>(TD)) {
|
|
SourceRange R(TemplateNameLoc, RAngleLoc);
|
|
if (SS.getRange().isValid())
|
|
R.setBegin(SS.getRange().getBegin());
|
|
|
|
Diag(CCLoc, diag::err_non_type_template_in_nested_name_specifier)
|
|
<< isa_and_nonnull<VarTemplateDecl>(TD) << Template << R;
|
|
NoteAllFoundTemplates(Template);
|
|
return true;
|
|
}
|
|
|
|
// We were able to resolve the template name to an actual template.
|
|
// Build an appropriate nested-name-specifier.
|
|
QualType T = CheckTemplateIdType(Template, TemplateNameLoc, TemplateArgs);
|
|
if (T.isNull())
|
|
return true;
|
|
|
|
// Alias template specializations can produce types which are not valid
|
|
// nested name specifiers.
|
|
if (!T->isDependentType() && !T->getAs<TagType>()) {
|
|
Diag(TemplateNameLoc, diag::err_nested_name_spec_non_tag) << T;
|
|
NoteAllFoundTemplates(Template);
|
|
return true;
|
|
}
|
|
|
|
// Provide source-location information for the template specialization type.
|
|
TypeLocBuilder Builder;
|
|
TemplateSpecializationTypeLoc SpecTL
|
|
= Builder.push<TemplateSpecializationTypeLoc>(T);
|
|
SpecTL.setTemplateKeywordLoc(TemplateKWLoc);
|
|
SpecTL.setTemplateNameLoc(TemplateNameLoc);
|
|
SpecTL.setLAngleLoc(LAngleLoc);
|
|
SpecTL.setRAngleLoc(RAngleLoc);
|
|
for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I)
|
|
SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo());
|
|
|
|
|
|
SS.Extend(Context, TemplateKWLoc, Builder.getTypeLocInContext(Context, T),
|
|
CCLoc);
|
|
return false;
|
|
}
|
|
|
|
namespace {
|
|
/// A structure that stores a nested-name-specifier annotation,
|
|
/// including both the nested-name-specifier
|
|
struct NestedNameSpecifierAnnotation {
|
|
NestedNameSpecifier *NNS;
|
|
};
|
|
}
|
|
|
|
void *Sema::SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS) {
|
|
if (SS.isEmpty() || SS.isInvalid())
|
|
return nullptr;
|
|
|
|
void *Mem = Context.Allocate(
|
|
(sizeof(NestedNameSpecifierAnnotation) + SS.location_size()),
|
|
alignof(NestedNameSpecifierAnnotation));
|
|
NestedNameSpecifierAnnotation *Annotation
|
|
= new (Mem) NestedNameSpecifierAnnotation;
|
|
Annotation->NNS = SS.getScopeRep();
|
|
memcpy(Annotation + 1, SS.location_data(), SS.location_size());
|
|
return Annotation;
|
|
}
|
|
|
|
void Sema::RestoreNestedNameSpecifierAnnotation(void *AnnotationPtr,
|
|
SourceRange AnnotationRange,
|
|
CXXScopeSpec &SS) {
|
|
if (!AnnotationPtr) {
|
|
SS.SetInvalid(AnnotationRange);
|
|
return;
|
|
}
|
|
|
|
NestedNameSpecifierAnnotation *Annotation
|
|
= static_cast<NestedNameSpecifierAnnotation *>(AnnotationPtr);
|
|
SS.Adopt(NestedNameSpecifierLoc(Annotation->NNS, Annotation + 1));
|
|
}
|
|
|
|
bool Sema::ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS) {
|
|
assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
|
|
|
|
// Don't enter a declarator context when the current context is an Objective-C
|
|
// declaration.
|
|
if (isa<ObjCContainerDecl>(CurContext) || isa<ObjCMethodDecl>(CurContext))
|
|
return false;
|
|
|
|
NestedNameSpecifier *Qualifier = SS.getScopeRep();
|
|
|
|
// There are only two places a well-formed program may qualify a
|
|
// declarator: first, when defining a namespace or class member
|
|
// out-of-line, and second, when naming an explicitly-qualified
|
|
// friend function. The latter case is governed by
|
|
// C++03 [basic.lookup.unqual]p10:
|
|
// In a friend declaration naming a member function, a name used
|
|
// in the function declarator and not part of a template-argument
|
|
// in a template-id is first looked up in the scope of the member
|
|
// function's class. If it is not found, or if the name is part of
|
|
// a template-argument in a template-id, the look up is as
|
|
// described for unqualified names in the definition of the class
|
|
// granting friendship.
|
|
// i.e. we don't push a scope unless it's a class member.
|
|
|
|
switch (Qualifier->getKind()) {
|
|
case NestedNameSpecifier::Global:
|
|
case NestedNameSpecifier::Namespace:
|
|
case NestedNameSpecifier::NamespaceAlias:
|
|
// These are always namespace scopes. We never want to enter a
|
|
// namespace scope from anything but a file context.
|
|
return CurContext->getRedeclContext()->isFileContext();
|
|
|
|
case NestedNameSpecifier::Identifier:
|
|
case NestedNameSpecifier::TypeSpec:
|
|
case NestedNameSpecifier::TypeSpecWithTemplate:
|
|
case NestedNameSpecifier::Super:
|
|
// These are never namespace scopes.
|
|
return true;
|
|
}
|
|
|
|
llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
|
|
}
|
|
|
|
bool Sema::ActOnCXXEnterDeclaratorScope(Scope *S, CXXScopeSpec &SS) {
|
|
assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
|
|
|
|
if (SS.isInvalid()) return true;
|
|
|
|
DeclContext *DC = computeDeclContext(SS, true);
|
|
if (!DC) return true;
|
|
|
|
// Before we enter a declarator's context, we need to make sure that
|
|
// it is a complete declaration context.
|
|
if (!DC->isDependentContext() && RequireCompleteDeclContext(SS, DC))
|
|
return true;
|
|
|
|
EnterDeclaratorContext(S, DC);
|
|
|
|
// Rebuild the nested name specifier for the new scope.
|
|
if (DC->isDependentContext())
|
|
RebuildNestedNameSpecifierInCurrentInstantiation(SS);
|
|
|
|
return false;
|
|
}
|
|
|
|
void Sema::ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS) {
|
|
assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
|
|
if (SS.isInvalid())
|
|
return;
|
|
assert(!SS.isInvalid() && computeDeclContext(SS, true) &&
|
|
"exiting declarator scope we never really entered");
|
|
ExitDeclaratorContext(S);
|
|
}
|