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Handle unscoped enumeration in nested name specifier.
If an unscoped enum is used as a nested name specifier and the language dialect is not C++ 11, issue an extension warning. This fixes PR16951. Differential Revision: http://reviews.llvm.org/D6389 llvm-svn: 226413
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@ -1231,6 +1231,9 @@ def warn_cxx98_compat_enum_nested_name_spec : Warning<
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def err_nested_name_spec_is_not_class : Error<
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"%0 cannot appear before '::' because it is not a class"
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"%select{ or namespace|, namespace, or enumeration}1; did you mean ':'?">;
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def ext_nested_name_spec_is_enum : ExtWarn<
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"use of enumeration in a nested name specifier is a C++11 extension">,
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InGroup<CXX11>;
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// C++ class members
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def err_storageclass_invalid_for_member : Error<
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@ -4632,7 +4632,8 @@ public:
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bool ActOnSuperScopeSpecifier(SourceLocation SuperLoc,
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SourceLocation ColonColonLoc, CXXScopeSpec &SS);
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bool isAcceptableNestedNameSpecifier(const NamedDecl *SD);
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bool isAcceptableNestedNameSpecifier(const NamedDecl *SD,
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bool *CanCorrect = nullptr);
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NamedDecl *FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS);
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bool isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
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@ -282,7 +282,11 @@ bool Sema::ActOnSuperScopeSpecifier(SourceLocation SuperLoc,
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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(const NamedDecl *SD) {
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/// \param SD Declaration checked for nested-name-specifier.
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/// \param IsExtension If not null and the declaration is accepted as an
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/// extension, the pointed variable is assigned true.
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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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@ -298,14 +302,23 @@ bool Sema::isAcceptableNestedNameSpecifier(const NamedDecl *SD) {
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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 (const TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
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if (TD->getUnderlyingType()->isRecordType() ||
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(Context.getLangOpts().CPlusPlus11 &&
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TD->getUnderlyingType()->isEnumeralType()))
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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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} else if (isa<RecordDecl>(SD) ||
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(Context.getLangOpts().CPlusPlus11 && isa<EnumDecl>(SD)))
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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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@ -599,7 +612,13 @@ bool Sema::BuildCXXNestedNameSpecifier(Scope *S,
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}
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NamedDecl *SD = Found.getAsSingle<NamedDecl>();
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if (isAcceptableNestedNameSpecifier(SD)) {
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bool IsExtension = false;
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bool AcceptSpec = isAcceptableNestedNameSpecifier(SD, &IsExtension);
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if (!AcceptSpec && IsExtension) {
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AcceptSpec = true;
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Diag(IdentifierLoc, diag::ext_nested_name_spec_is_enum);
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}
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if (AcceptSpec) {
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if (!ObjectType.isNull() && !ObjectTypeSearchedInScope &&
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!getLangOpts().CPlusPlus11) {
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// C++03 [basic.lookup.classref]p4:
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@ -13,7 +13,8 @@ int A::*pdi1;
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int (::A::*pdi2);
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int (A::*pfi)(int);
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int B::*pbi; // expected-error {{'B' is not a class, namespace, or enumeration}}
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int B::*pbi; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
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// expected-error {{'pbi' does not point into a class}}
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int C::*pci; // expected-error {{'pci' does not point into a class}}
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void A::*pdv; // expected-error {{'pdv' declared as a member pointer to void}}
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int& A::*pdr; // expected-error {{'pdr' declared as a member pointer to a reference}}
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@ -115,8 +115,8 @@ namespace E {
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X = 0
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};
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void f() {
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return E::X; // expected-error{{'E::Nested::E' is not a class, namespace, or enumeration}}
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int f() {
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return E::X; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}}
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}
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}
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}
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@ -410,3 +410,28 @@ struct S7c {
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};
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}
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namespace PR16951 {
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namespace ns {
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enum an_enumeration {
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ENUMERATOR // expected-note{{'ENUMERATOR' declared here}}
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};
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}
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int x1 = ns::an_enumeration::ENUMERATOR; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}}
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int x2 = ns::an_enumeration::ENUMERATOR::vvv; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
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// expected-error{{'ENUMERATOR' is not a class, namespace, or enumeration}} \
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int x3 = ns::an_enumeration::X; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
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// expected-error{{no member named 'X'}}
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enum enumerator_2 {
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ENUMERATOR_2
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};
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int x4 = enumerator_2::ENUMERATOR_2; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}}
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int x5 = enumerator_2::X2; // expected-warning{{use of enumeration in a nested name specifier is a C++11 extension}} \
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// expected-error{{no member named 'X2' in 'PR16951::enumerator_2'}}
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}
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