/// Compute the DeclContext that is associated with the given
/// scope specifier.
///
/// \param SS the C++ scope specifier as it appears in the source
///
/// \param EnteringContext when true, we will be entering the context of
/// this scope specifier, so we can retrieve the declaration context of a
/// class template or class template partial specialization even if it is
/// not the current instantiation.
///
/// \returns the declaration context represented by the scope specifier @p SS,
/// or NULL if the declaration context cannot be computed (e.g., because it is
/// dependent and not the current instantiation).
DeclContext *Sema::computeDeclContext(const CXXScopeSpec &SS,
bool EnteringContext) {
if (!SS.isSet() || SS.isInvalid())
return nullptr;
NestedNameSpecifier *NNS = SS.getScopeRep();
if (NNS->isDependent()) {
// If this nested-name-specifier refers to the current
// instantiation, return its DeclContext.
if (CXXRecordDecl *Record = getCurrentInstantiationOf(NNS))
return Record;
if (EnteringContext) {
const Type *NNSType = NNS->getAsType();
if (!NNSType) {
return nullptr;
}
// Look through type alias templates, per C++0x [temp.dep.type]p1.
NNSType = Context.getCanonicalType(NNSType);
if (const TemplateSpecializationType *SpecType
= NNSType->getAs<TemplateSpecializationType>()) {
// We are entering the context of the nested name specifier, so try to
// match the nested name specifier to either a primary class template
// or a class template partial specialization.
if (ClassTemplateDecl *ClassTemplate
= dyn_cast_or_null<ClassTemplateDecl>(
SpecType->getTemplateName().getAsTemplateDecl())) {
QualType ContextType
= Context.getCanonicalType(QualType(SpecType, 0));
// If the type of the nested name specifier is the same as the
// injected class name of the named class template, we're entering
// into that class template definition.
QualType Injected
= ClassTemplate->getInjectedClassNameSpecialization();
if (Context.hasSameType(Injected, ContextType))
return ClassTemplate->getTemplatedDecl();
// If the type of the nested name specifier is the same as the
// type of one of the class template's class template partial
// specializations, we're entering into the definition of that
// class template partial specialization.
if (ClassTemplatePartialSpecializationDecl *PartialSpec
= ClassTemplate->findPartialSpecialization(ContextType)) {
// A declaration of the partial specialization must be visible.
// We can always recover here, because this only happens when we're
// entering the context, and that can't happen in a SFINAE context.
assert(!isSFINAEContext() &&
"partial specialization scope specifier in SFINAE context?");
if (!hasVisibleDeclaration(PartialSpec))
diagnoseMissingImport(SS.getLastQualifierNameLoc(), PartialSpec,
MissingImportKind::PartialSpecialization,
/*Recover*/true);
return PartialSpec;
}
}
} else if (const RecordType *RecordT = NNSType->getAs<RecordType>()) {
// The nested name specifier refers to a member of a class template.
return RecordT->getDecl();
}
}
return nullptr;
}
switch (NNS->getKind()) {
case NestedNameSpecifier::Identifier:
llvm_unreachable("Dependent nested-name-specifier has no DeclContext");
case NestedNameSpecifier::Namespace:
return NNS->getAsNamespace();
case NestedNameSpecifier::NamespaceAlias:
return NNS->getAsNamespaceAlias()->getNamespace();
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate: {
const TagType *Tag = NNS->getAsType()->getAs<TagType>();
assert(Tag && "Non-tag type in nested-name-specifier");
return Tag->getDecl();
}
case NestedNameSpecifier::Global:
return Context.getTranslationUnitDecl();
case NestedNameSpecifier::Super:
return NNS->getAsRecordDecl();
}
llvm_unreachable("Invalid NestedNameSpecifier::Kind!");
}
/// \brief Compute the DeclContext that is associated with the given
/// scope specifier.
///
/// \param SS the C++ scope specifier as it appears in the source
///
/// \param EnteringContext when true, we will be entering the context of
/// this scope specifier, so we can retrieve the declaration context of a
/// class template or class template partial specialization even if it is
/// not the current instantiation.
///
/// \returns the declaration context represented by the scope specifier @p SS,
/// or NULL if the declaration context cannot be computed (e.g., because it is
/// dependent and not the current instantiation).
DeclContext *Sema::computeDeclContext(const CXXScopeSpec &SS,
bool EnteringContext) {
if (!SS.isSet() || SS.isInvalid())
return 0;
NestedNameSpecifier *NNS
= static_cast<NestedNameSpecifier *>(SS.getScopeRep());
if (NNS->isDependent()) {
// If this nested-name-specifier refers to the current
// instantiation, return its DeclContext.
if (CXXRecordDecl *Record = getCurrentInstantiationOf(NNS))
return Record;
if (EnteringContext) {
const Type *NNSType = NNS->getAsType();
if (!NNSType) {
return 0;
}
// Look through type alias templates, per C++0x [temp.dep.type]p1.
NNSType = Context.getCanonicalType(NNSType);
if (const TemplateSpecializationType *SpecType
= NNSType->getAs<TemplateSpecializationType>()) {
// We are entering the context of the nested name specifier, so try to
// match the nested name specifier to either a primary class template
// or a class template partial specialization.
if (ClassTemplateDecl *ClassTemplate
= dyn_cast_or_null<ClassTemplateDecl>(
SpecType->getTemplateName().getAsTemplateDecl())) {
QualType ContextType
= Context.getCanonicalType(QualType(SpecType, 0));
// If the type of the nested name specifier is the same as the
// injected class name of the named class template, we're entering
// into that class template definition.
QualType Injected
= ClassTemplate->getInjectedClassNameSpecialization();
if (Context.hasSameType(Injected, ContextType))
return ClassTemplate->getTemplatedDecl();
// If the type of the nested name specifier is the same as the
// type of one of the class template's class template partial
// specializations, we're entering into the definition of that
// class template partial specialization.
if (ClassTemplatePartialSpecializationDecl *PartialSpec
= ClassTemplate->findPartialSpecialization(ContextType))
return PartialSpec;
}
} else if (const RecordType *RecordT = NNSType->getAs<RecordType>()) {
// The nested name specifier refers to a member of a class template.
return RecordT->getDecl();
}
}
return 0;
}
switch (NNS->getKind()) {
case NestedNameSpecifier::Identifier:
llvm_unreachable("Dependent nested-name-specifier has no DeclContext");
case NestedNameSpecifier::Namespace:
return NNS->getAsNamespace();
case NestedNameSpecifier::NamespaceAlias:
return NNS->getAsNamespaceAlias()->getNamespace();
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate: {
const TagType *Tag = NNS->getAsType()->getAs<TagType>();
assert(Tag && "Non-tag type in nested-name-specifier");
return Tag->getDecl();
} break;
case NestedNameSpecifier::Global:
return Context.getTranslationUnitDecl();
}
// Required to silence a GCC warning.
return 0;
}
// It handles two cases:
// * remove the specifier if it refers to TheNamespaceDecl
// * replace the specifier with a new name if the corresponding namespace
// has a name conflicts, e.g.,
// namespace NS1 { }
// namespace NS2 {
// namespace NS1 {
// void foo() {}
// }
// namespace NS3 {
// using NS1::foo;
// void bar() { foo(); }
// }
// }
// If we remove NS2, then the inner namespace NS1 conflicts with
// the global NS1, but "using NS1::foo" refers to the conflicting NS1.
bool RemoveNamespaceRewriteVisitor::TraverseNestedNameSpecifierLoc(
NestedNameSpecifierLoc QualifierLoc)
{
SkipRewriteName = false;
// Reset the flag
if (SkipTraverseNestedNameSpecifier) {
SkipTraverseNestedNameSpecifier = false;
return true;
}
if (!QualifierLoc || QualifierLoc.getBeginLoc().isInvalid())
return true;
SmallVector<NestedNameSpecifierLoc, 8> QualifierLocs;
for (; QualifierLoc; QualifierLoc = QualifierLoc.getPrefix())
QualifierLocs.push_back(QualifierLoc);
while (!QualifierLocs.empty()) {
NestedNameSpecifierLoc Loc = QualifierLocs.pop_back_val();
NestedNameSpecifier *NNS = Loc.getNestedNameSpecifier();
NestedNameSpecifier::SpecifierKind Kind = NNS->getKind();
const NamespaceDecl *ND = NULL;
switch (Kind) {
case NestedNameSpecifier::Namespace: {
ND = NNS->getAsNamespace()->getCanonicalDecl();
break;
}
case NestedNameSpecifier::NamespaceAlias: {
const NamespaceAliasDecl *NAD = NNS->getAsNamespaceAlias();
if (!NAD->getQualifier())
ND = NAD->getNamespace()->getCanonicalDecl();
break;
}
case NestedNameSpecifier::TypeSpec: // Fall-through
case NestedNameSpecifier::TypeSpecWithTemplate:
TraverseTypeLoc(Loc.getTypeLoc());
break;
default:
break;
}
if (!ND)
continue;
if (ND == ConsumerInstance->TheNamespaceDecl) {
ConsumerInstance->RewriteHelper->removeSpecifier(Loc);
continue;
}
std::string SpecifierName;
if (Loc.getBeginLoc().isInvalid())
continue;
ConsumerInstance->RewriteHelper->getSpecifierAsString(Loc, SpecifierName);
std::string NDName = ND->getNameAsString();
std::string Name = "";
ConsumerInstance->getNewName(ND, Name);
// Skip it if this specifier is the same as ND's name.
// Note that the above case could only happen for UsingNamedDecls
if (ConsumerInstance->isForUsingNamedDecls && (SpecifierName == NDName)) {
// It could happen for example:
// namespace NS1 { }
// namespace NS2 {
// using namespace NS1;
// void bar() { NS1::foo(); }
// }
// If we remove NS2, then the guard below avoids renaming
// NS1::foo to NS1::foo::foo.
if (Name.empty()) {
SkipRewriteName = true;
return true;
}
// another case to handle:
// namespace NS1 {
// namespace NS2 {
// void foo() {}
// }
// }
// namespace NS3 {
// using namespace NS1;
// void bar() { NS2::foo(); }
// }
// If we remove NS3, we do need to rename NS2::foo as NS1::NS2::foo
if (!ConsumerInstance->isSuffix(Name, SpecifierName)) {
SkipRewriteName = true;
return true;
}
}
if (!Name.empty()) {
ConsumerInstance->RewriteHelper->replaceSpecifier(Loc, Name);
SkipRewriteName = true;
return true;
}
}
return true;
}
