forked from OSchip/llvm-project
684 lines
27 KiB
C++
684 lines
27 KiB
C++
//===--- SemaCXXScopeSpec.cpp - Semantic Analysis for C++ scope specifiers-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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 "clang/Sema/Sema.h"
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#include "clang/Sema/Lookup.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/Parse/DeclSpec.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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/// \brief Find the current instantiation that associated with the given type.
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static CXXRecordDecl *getCurrentInstantiationOf(QualType T) {
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if (T.isNull())
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return 0;
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const Type *Ty = T->getCanonicalTypeInternal().getTypePtr();
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if (isa<RecordType>(Ty))
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return cast<CXXRecordDecl>(cast<RecordType>(Ty)->getDecl());
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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 0;
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}
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/// \brief Compute the DeclContext that is associated with the given type.
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///
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/// \param T the type for which we are attempting to find a DeclContext.
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///
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/// \returns the declaration context represented by the type T,
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/// or NULL if the declaration context cannot be computed (e.g., because it is
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/// dependent and not the current instantiation).
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DeclContext *Sema::computeDeclContext(QualType T) {
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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);
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}
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/// \brief Compute the DeclContext that is associated with the given
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/// scope specifier.
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///
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/// \param SS the C++ scope specifier as it appears in the source
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///
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/// \param EnteringContext when true, we will be entering the context of
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/// this scope specifier, so we can retrieve the declaration context of a
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/// class template or class template partial specialization even if it is
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/// not the current instantiation.
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///
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/// \returns the declaration context represented by the scope specifier @p SS,
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/// or NULL if the declaration context cannot be computed (e.g., because it is
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/// dependent and not the current instantiation).
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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 0;
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NestedNameSpecifier *NNS
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= static_cast<NestedNameSpecifier *>(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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// do nothing, fall out
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} else 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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// 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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// If the type of the nested name specifier is the same as the
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// type of one of the class template's class template partial
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// specializations, we're entering into the definition of that
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// class template partial specialization.
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if (ClassTemplatePartialSpecializationDecl *PartialSpec
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= ClassTemplate->findPartialSpecialization(ContextType))
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return PartialSpec;
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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 0;
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}
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switch (NNS->getKind()) {
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case NestedNameSpecifier::Identifier:
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assert(false && "Dependent nested-name-specifier has no DeclContext");
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break;
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case NestedNameSpecifier::Namespace:
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return NNS->getAsNamespace();
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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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} break;
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case NestedNameSpecifier::Global:
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return Context.getTranslationUnitDecl();
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}
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// Required to silence a GCC warning.
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return 0;
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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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NestedNameSpecifier *NNS
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= static_cast<NestedNameSpecifier *>(SS.getScopeRep());
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return NNS->isDependent();
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}
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// \brief Determine whether this C++ scope specifier refers to an
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// unknown specialization, i.e., a dependent type that is not the
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// current instantiation.
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bool Sema::isUnknownSpecialization(const CXXScopeSpec &SS) {
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if (!isDependentScopeSpecifier(SS))
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return false;
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NestedNameSpecifier *NNS
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= static_cast<NestedNameSpecifier *>(SS.getScopeRep());
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return getCurrentInstantiationOf(NNS) == 0;
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}
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/// \brief If the given nested name specifier refers to the current
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/// instantiation, return the declaration that corresponds to that
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/// current instantiation (C++0x [temp.dep.type]p1).
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///
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/// \param NNS a dependent nested name specifier.
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CXXRecordDecl *Sema::getCurrentInstantiationOf(NestedNameSpecifier *NNS) {
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assert(getLangOptions().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 0;
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QualType T = QualType(NNS->getAsType(), 0);
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return ::getCurrentInstantiationOf(T);
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}
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/// \brief 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 != 0 && "given null context");
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if (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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if (Tag->isDependentContext())
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return false;
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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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const TagType *TagT = Context.getTypeDeclType(Tag)->getAs<TagType>();
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if (TagT && TagT->isBeingDefined())
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return false;
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// The type must be complete.
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if (RequireCompleteType(SS.getRange().getBegin(),
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Context.getTypeDeclType(Tag),
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PDiag(diag::err_incomplete_nested_name_spec)
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<< SS.getRange())) {
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SS.setScopeRep(0); // Mark the ScopeSpec invalid.
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return true;
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}
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}
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return false;
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}
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/// ActOnCXXGlobalScopeSpecifier - Return the object that represents the
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/// global scope ('::').
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Sema::CXXScopeTy *Sema::ActOnCXXGlobalScopeSpecifier(Scope *S,
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SourceLocation CCLoc) {
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return NestedNameSpecifier::GlobalSpecifier(Context);
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}
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/// \brief Determines whether the given declaration is an valid acceptable
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/// result for name lookup of a nested-name-specifier.
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bool Sema::isAcceptableNestedNameSpecifier(NamedDecl *SD) {
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if (!SD)
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return false;
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// Namespace and namespace aliases are fine.
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if (isa<NamespaceDecl>(SD) || isa<NamespaceAliasDecl>(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++0x, 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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else if (TypedefDecl *TD = dyn_cast<TypedefDecl>(SD)) {
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if (TD->getUnderlyingType()->isRecordType() ||
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(Context.getLangOptions().CPlusPlus0x &&
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TD->getUnderlyingType()->isEnumeralType()))
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return true;
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} else if (isa<RecordDecl>(SD) ||
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(Context.getLangOptions().CPlusPlus0x && isa<EnumDecl>(SD)))
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return true;
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return false;
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}
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/// \brief 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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NamedDecl *Sema::FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS) {
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if (!S || !NNS)
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return 0;
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while (NNS->getPrefix())
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NNS = NNS->getPrefix();
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if (NNS->getKind() != NestedNameSpecifier::Identifier)
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return 0;
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LookupResult Found(*this, NNS->getAsIdentifier(), SourceLocation(),
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LookupNestedNameSpecifierName);
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LookupName(Found, S);
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assert(!Found.isAmbiguous() && "Cannot handle ambiguities here yet");
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if (!Found.isSingleResult())
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return 0;
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NamedDecl *Result = Found.getFoundDecl();
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if (isAcceptableNestedNameSpecifier(Result))
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return Result;
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return 0;
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}
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bool Sema::isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
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SourceLocation IdLoc,
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IdentifierInfo &II,
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TypeTy *ObjectTypePtr) {
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QualType ObjectType = GetTypeFromParser(ObjectTypePtr);
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LookupResult Found(*this, &II, IdLoc, LookupNestedNameSpecifierName);
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// Determine where to perform name lookup
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DeclContext *LookupCtx = 0;
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bool isDependent = false;
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if (!ObjectType.isNull()) {
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// This nested-name-specifier occurs in a member access expression, e.g.,
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// x->B::f, and we are looking into the type of the object.
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assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
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LookupCtx = computeDeclContext(ObjectType);
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isDependent = ObjectType->isDependentType();
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} else if (SS.isSet()) {
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// This nested-name-specifier occurs after another nested-name-specifier,
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// so long into the context associated with the prior nested-name-specifier.
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LookupCtx = computeDeclContext(SS, false);
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isDependent = isDependentScopeSpecifier(SS);
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Found.setContextRange(SS.getRange());
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}
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if (LookupCtx) {
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// Perform "qualified" name lookup into the declaration context we
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// computed, which is either the type of the base of a member access
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// expression or the declaration context associated with a prior
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// nested-name-specifier.
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// The declaration context must be complete.
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if (!LookupCtx->isDependentContext() &&
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RequireCompleteDeclContext(SS, LookupCtx))
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return false;
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LookupQualifiedName(Found, LookupCtx);
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} else if (isDependent) {
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return false;
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} else {
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LookupName(Found, S);
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}
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Found.suppressDiagnostics();
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if (NamedDecl *ND = Found.getAsSingle<NamedDecl>())
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return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND);
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return false;
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}
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/// \brief Build a new nested-name-specifier for "identifier::", as described
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/// by ActOnCXXNestedNameSpecifier.
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///
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/// This routine differs only slightly from ActOnCXXNestedNameSpecifier, in
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/// that it contains an extra parameter \p ScopeLookupResult, which provides
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/// the result of name lookup within the scope of the nested-name-specifier
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/// that was computed at template definition time.
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///
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/// If ErrorRecoveryLookup is true, then this call is used to improve error
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/// recovery. This means that it should not emit diagnostics, it should
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/// just return null on failure. It also means it should only return a valid
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/// scope if it *knows* that the result is correct. It should not return in a
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/// dependent context, for example.
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Sema::CXXScopeTy *Sema::BuildCXXNestedNameSpecifier(Scope *S,
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CXXScopeSpec &SS,
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SourceLocation IdLoc,
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SourceLocation CCLoc,
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IdentifierInfo &II,
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QualType ObjectType,
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NamedDecl *ScopeLookupResult,
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bool EnteringContext,
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bool ErrorRecoveryLookup) {
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NestedNameSpecifier *Prefix
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= static_cast<NestedNameSpecifier *>(SS.getScopeRep());
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LookupResult Found(*this, &II, IdLoc, LookupNestedNameSpecifierName);
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// Determine where to perform name lookup
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DeclContext *LookupCtx = 0;
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bool isDependent = false;
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if (!ObjectType.isNull()) {
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// This nested-name-specifier occurs in a member access expression, e.g.,
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// x->B::f, and we are looking into the type of the object.
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assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
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LookupCtx = computeDeclContext(ObjectType);
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isDependent = ObjectType->isDependentType();
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} else if (SS.isSet()) {
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// This nested-name-specifier occurs after another nested-name-specifier,
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// so long into the context associated with the prior nested-name-specifier.
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LookupCtx = computeDeclContext(SS, EnteringContext);
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isDependent = isDependentScopeSpecifier(SS);
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Found.setContextRange(SS.getRange());
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}
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bool ObjectTypeSearchedInScope = false;
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if (LookupCtx) {
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// Perform "qualified" name lookup into the declaration context we
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// computed, which is either the type of the base of a member access
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// expression or the declaration context associated with a prior
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// nested-name-specifier.
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// The declaration context must be complete.
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if (!LookupCtx->isDependentContext() &&
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RequireCompleteDeclContext(SS, LookupCtx))
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return 0;
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LookupQualifiedName(Found, LookupCtx);
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if (!ObjectType.isNull() && Found.empty()) {
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// C++ [basic.lookup.classref]p4:
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// If the id-expression in a class member access is a qualified-id of
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// the form
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//
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// class-name-or-namespace-name::...
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//
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// the class-name-or-namespace-name following the . or -> operator is
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// looked up both in the context of the entire postfix-expression and in
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// the scope of the class of the object expression. If the name is found
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// only in the scope of the class of the object expression, the name
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// shall refer to a class-name. If the name is found only in the
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// context of the entire postfix-expression, the name shall refer to a
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// class-name or namespace-name. [...]
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//
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// Qualified name lookup into a class will not find a namespace-name,
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// so we do not need to diagnoste that case specifically. However,
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// this qualified name lookup may find nothing. In that case, perform
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// unqualified name lookup in the given scope (if available) or
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// reconstruct the result from when name lookup was performed at template
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// definition time.
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if (S)
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LookupName(Found, S);
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else if (ScopeLookupResult)
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Found.addDecl(ScopeLookupResult);
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ObjectTypeSearchedInScope = true;
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}
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} else if (!isDependent) {
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// Perform unqualified name lookup in the current scope.
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LookupName(Found, S);
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}
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// If we performed lookup into a dependent context and did not find anything,
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// that's fine: just build a dependent nested-name-specifier.
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if (Found.empty() && isDependent &&
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!(LookupCtx && LookupCtx->isRecord() &&
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(!cast<CXXRecordDecl>(LookupCtx)->hasDefinition() ||
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!cast<CXXRecordDecl>(LookupCtx)->hasAnyDependentBases()))) {
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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 0;
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// We were not able to compute the declaration context for a dependent
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// base object type or prior nested-name-specifier, so this
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// nested-name-specifier refers to an unknown specialization. Just build
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// a dependent nested-name-specifier.
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if (!Prefix)
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return NestedNameSpecifier::Create(Context, &II);
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return NestedNameSpecifier::Create(Context, Prefix, &II);
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}
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// FIXME: Deal with ambiguities cleanly.
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if (Found.empty() && !ErrorRecoveryLookup) {
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// We haven't found anything, and we're not recovering from a
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// different kind of error, so look for typos.
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DeclarationName Name = Found.getLookupName();
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if (CorrectTypo(Found, S, &SS, LookupCtx, EnteringContext,
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CTC_NoKeywords) &&
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Found.isSingleResult() &&
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isAcceptableNestedNameSpecifier(Found.getAsSingle<NamedDecl>())) {
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if (LookupCtx)
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Diag(Found.getNameLoc(), diag::err_no_member_suggest)
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<< Name << LookupCtx << Found.getLookupName() << SS.getRange()
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<< FixItHint::CreateReplacement(Found.getNameLoc(),
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Found.getLookupName().getAsString());
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else
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Diag(Found.getNameLoc(), diag::err_undeclared_var_use_suggest)
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<< Name << Found.getLookupName()
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<< FixItHint::CreateReplacement(Found.getNameLoc(),
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Found.getLookupName().getAsString());
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if (NamedDecl *ND = Found.getAsSingle<NamedDecl>())
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Diag(ND->getLocation(), diag::note_previous_decl)
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<< ND->getDeclName();
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} else {
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Found.clear();
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Found.setLookupName(&II);
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}
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}
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NamedDecl *SD = Found.getAsSingle<NamedDecl>();
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if (isAcceptableNestedNameSpecifier(SD)) {
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if (!ObjectType.isNull() && !ObjectTypeSearchedInScope) {
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// C++ [basic.lookup.classref]p4:
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// [...] If the name is found in both contexts, the
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// class-name-or-namespace-name shall refer to the same entity.
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//
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// We already found the name in the scope of the object. Now, look
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// into the current scope (the scope of the postfix-expression) to
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// see if we can find the same name there. As above, if there is no
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// scope, reconstruct the result from the template instantiation itself.
|
|
NamedDecl *OuterDecl;
|
|
if (S) {
|
|
LookupResult FoundOuter(*this, &II, IdLoc, LookupNestedNameSpecifierName);
|
|
LookupName(FoundOuter, S);
|
|
OuterDecl = FoundOuter.getAsSingle<NamedDecl>();
|
|
} else
|
|
OuterDecl = ScopeLookupResult;
|
|
|
|
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 0;
|
|
|
|
Diag(IdLoc, diag::err_nested_name_member_ref_lookup_ambiguous)
|
|
<< &II;
|
|
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 (NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(SD))
|
|
return NestedNameSpecifier::Create(Context, Prefix, Namespace);
|
|
|
|
// FIXME: It would be nice to maintain the namespace alias name, then
|
|
// see through that alias when resolving the nested-name-specifier down to
|
|
// a declaration context.
|
|
if (NamespaceAliasDecl *Alias = dyn_cast<NamespaceAliasDecl>(SD))
|
|
return NestedNameSpecifier::Create(Context, Prefix,
|
|
|
|
Alias->getNamespace());
|
|
|
|
QualType T = Context.getTypeDeclType(cast<TypeDecl>(SD));
|
|
return NestedNameSpecifier::Create(Context, Prefix, false,
|
|
T.getTypePtr());
|
|
}
|
|
|
|
// Otherwise, we have an error case. If we don't want diagnostics, just
|
|
// return an error now.
|
|
if (ErrorRecoveryLookup)
|
|
return 0;
|
|
|
|
// 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);
|
|
}
|
|
|
|
unsigned DiagID;
|
|
if (!Found.empty())
|
|
DiagID = diag::err_expected_class_or_namespace;
|
|
else if (SS.isSet()) {
|
|
Diag(IdLoc, diag::err_no_member) << &II << LookupCtx << SS.getRange();
|
|
return 0;
|
|
} else
|
|
DiagID = diag::err_undeclared_var_use;
|
|
|
|
if (SS.isSet())
|
|
Diag(IdLoc, DiagID) << &II << SS.getRange();
|
|
else
|
|
Diag(IdLoc, DiagID) << &II;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// ActOnCXXNestedNameSpecifier - Called during parsing of a
|
|
/// nested-name-specifier. e.g. for "foo::bar::" we parsed "foo::" and now
|
|
/// we want to resolve "bar::". 'SS' is empty or the previously parsed
|
|
/// nested-name part ("foo::"), 'IdLoc' is the source location of 'bar',
|
|
/// 'CCLoc' is the location of '::' and 'II' is the identifier for 'bar'.
|
|
/// Returns a CXXScopeTy* object representing the C++ scope.
|
|
Sema::CXXScopeTy *Sema::ActOnCXXNestedNameSpecifier(Scope *S,
|
|
CXXScopeSpec &SS,
|
|
SourceLocation IdLoc,
|
|
SourceLocation CCLoc,
|
|
IdentifierInfo &II,
|
|
TypeTy *ObjectTypePtr,
|
|
bool EnteringContext) {
|
|
return BuildCXXNestedNameSpecifier(S, SS, IdLoc, CCLoc, II,
|
|
QualType::getFromOpaquePtr(ObjectTypePtr),
|
|
/*ScopeLookupResult=*/0, EnteringContext,
|
|
false);
|
|
}
|
|
|
|
/// IsInvalidUnlessNestedName - This method is used for error recovery
|
|
/// purposes to determine whether the specified identifier is only valid as
|
|
/// a nested name specifier, for example a namespace name. It is
|
|
/// conservatively correct to always return false from this method.
|
|
///
|
|
/// The arguments are the same as those passed to ActOnCXXNestedNameSpecifier.
|
|
bool Sema::IsInvalidUnlessNestedName(Scope *S, CXXScopeSpec &SS,
|
|
IdentifierInfo &II, TypeTy *ObjectType,
|
|
bool EnteringContext) {
|
|
return BuildCXXNestedNameSpecifier(S, SS, SourceLocation(), SourceLocation(),
|
|
II, QualType::getFromOpaquePtr(ObjectType),
|
|
/*ScopeLookupResult=*/0, EnteringContext,
|
|
true);
|
|
}
|
|
|
|
Sema::CXXScopeTy *Sema::ActOnCXXNestedNameSpecifier(Scope *S,
|
|
const CXXScopeSpec &SS,
|
|
TypeTy *Ty,
|
|
SourceRange TypeRange,
|
|
SourceLocation CCLoc) {
|
|
NestedNameSpecifier *Prefix
|
|
= static_cast<NestedNameSpecifier *>(SS.getScopeRep());
|
|
QualType T = GetTypeFromParser(Ty);
|
|
return NestedNameSpecifier::Create(Context, Prefix, /*FIXME:*/false,
|
|
T.getTypePtr());
|
|
}
|
|
|
|
bool Sema::ShouldEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS) {
|
|
assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
|
|
|
|
NestedNameSpecifier *Qualifier =
|
|
static_cast<NestedNameSpecifier*>(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:
|
|
// These are always namespace scopes. We never want to enter a
|
|
// namespace scope from anything but a file context.
|
|
return CurContext->getLookupContext()->isFileContext();
|
|
|
|
case NestedNameSpecifier::Identifier:
|
|
case NestedNameSpecifier::TypeSpec:
|
|
case NestedNameSpecifier::TypeSpecWithTemplate:
|
|
// These are never namespace scopes.
|
|
return true;
|
|
}
|
|
|
|
// Silence bogus warning.
|
|
return false;
|
|
}
|
|
|
|
/// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
|
|
/// scope or nested-name-specifier) is parsed, part of a declarator-id.
|
|
/// After this method is called, according to [C++ 3.4.3p3], names should be
|
|
/// looked up in the declarator-id's scope, until the declarator is parsed and
|
|
/// ActOnCXXExitDeclaratorScope is called.
|
|
/// The 'SS' should be a non-empty valid CXXScopeSpec.
|
|
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;
|
|
}
|
|
|
|
/// ActOnCXXExitDeclaratorScope - Called when a declarator that previously
|
|
/// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same
|
|
/// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well.
|
|
/// Used to indicate that names should revert to being looked up in the
|
|
/// defining scope.
|
|
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);
|
|
}
|