8000 [Clang][Sema] Allow qualified type names in `swift_name` attribute · llvm/llvm-project@d8ca77e · GitHub
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[Clang][Sema] Allow qualified type names in swift_name attribute
This allows adding `__attribute__((swift_name("MyNamespace.MyType.my_method()")))` on standalone C++ functions to make Swift import them as member functions of a type that is nested in a C++ namespace. rdar://138934888
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‎clang/lib/Sema/SemaSwift.cpp

Lines changed: 13 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -72,6 +72,15 @@ static bool isValidSwiftErrorResultType(QualType Ty) {
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return isValidSwiftContextType(Ty);
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}
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75+
static bool isValidSwiftContextName(StringRef ContextName) {
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// ContextName might be qualified, e.g. 'MyNamespace.MyStruct'.
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SmallVector<StringRef, 1> ContextNameComponents;
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ContextName.split(ContextNameComponents, '.');
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return all_of(ContextNameComponents, [&](StringRef Component) {
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return isValidAsciiIdentifier(Component);
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});
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}
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void SemaSwift::handleAttrAttr(Decl *D, const ParsedAttr &AL) {
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if (AL.isInvalid() || AL.isUsedAsTypeAttr())
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return;
@@ -356,11 +365,11 @@ static bool validateSwiftFunctionName(Sema &S, const ParsedAttr &AL,
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// Split at the first '.', if it exists, which separates the context name
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// from the base name.
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std::tie(ContextName, BaseName) = BaseName.split('.');
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std::tie(ContextName, BaseName) = BaseName.rsplit('.');
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if (BaseName.empty()) {
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BaseName = ContextName;
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ContextName = StringRef();
363-
} else if (ContextName.empty() || !isValidAsciiIdentifier(ContextName)) {
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} else if (ContextName.empty() || !isValidSwiftContextName(ContextName)) {
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S.Diag(Loc, diag::warn_attr_swift_name_invalid_identifier)
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<< AL << /*context*/ 1;
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return false;
@@ -584,11 +593,11 @@ bool SemaSwift::DiagnoseName(Decl *D, StringRef Name, SourceLocation Loc,
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!IsAsync) {
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StringRef ContextName, BaseName;
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587-
std::tie(ContextName, BaseName) = Name.split('.');
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std::tie(ContextName, BaseName) = Name.rsplit('.');
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if (BaseName.empty()) {
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BaseName = ContextName;
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ContextName = StringRef();
591-
} else if (!isValidAsciiIdentifier(ContextName)) {
600+
} else if (!isValidSwiftContextName(ContextName)) {
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Diag(Loc, diag::warn_attr_swift_name_invalid_identifier)
593602
<< AL << /*context*/ 1;
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return false;

‎clang/test/SemaObjCXX/attr-swift_name-cxx.mm

Lines changed: 36 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,43 @@
11
// RUN: %clang_cc1 -verify -fsyntax-only -fobjc-arc -fblocks %s
22

3+
#define SWIFT_NAME(name) __attribute__((swift_name(name)))
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#define SWIFT_ASYNC_NAME(name) __attribute__((__swift_async_name__(name)))
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namespace MyNS {
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struct NestedStruct {};
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}
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void nestedStruct_method(MyNS::NestedStruct) SWIFT_NAME("MyNS.NestedStruct.method(self:)");
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void nestedStruct_methodConstRef(const MyNS::NestedStruct&) SWIFT_NAME("MyNS.NestedStruct.methodConstRef(self:)");
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void nestedStruct_invalidContext1(MyNS::NestedStruct) SWIFT_NAME(".MyNS.NestedStruct.invalidContext1(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the context name}}
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void nestedStruct_invalidContext2(MyNS::NestedStruct) SWIFT_NAME("MyNS::NestedStruct.invalidContext2(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the context name}}
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void nestedStruct_invalidContext3(MyNS::NestedStruct) SWIFT_NAME("::MyNS::NestedStruct.invalidContext3(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the context name}}
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void nestedStruct_invalidContext4(MyNS::NestedStruct) SWIFT_NAME("MyNS..NestedStruct.invalidContext4(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the context name}}
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void nestedStruct_invalidContext5(MyNS::NestedStruct) SWIFT_NAME("MyNS.NestedStruct.invalidContext5.(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the base name}}
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void nestedStruct_invalidContext6(MyNS::NestedStruct) SWIFT_NAME("MyNS.NestedStruct::invalidContext6(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the base name}}
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namespace MyNS {
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namespace MyDeepNS {
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struct DeepNestedStruct {};
22+
}
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}
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void deepNestedStruct_method(MyNS::MyDeepNS::DeepNestedStruct) SWIFT_NAME("MyNS.MyDeepNS.DeepNestedStruct.method(self:)");
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void deepNestedStruct_methodConstRef(const MyNS::MyDeepNS::DeepNestedStruct&) SWIFT_NAME("MyNS.MyDeepNS.DeepNestedStruct.methodConstRef(self:)");
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void deepNestedStruct_invalidContext(const MyNS::MyDeepNS::DeepNestedStruct&) SWIFT_NAME("MyNS::MyDeepNS::DeepNestedStruct.methodConstRef(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the context name}}
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typedef MyNS::MyDeepNS::DeepNestedStruct DeepNestedStructTypedef;
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void deepNestedStructTypedef_method(DeepNestedStructTypedef) SWIFT_NAME("DeepNestedStructTypedef.method(self:)");
32+
void deepNestedStructTypedef_methodQualName(MyNS::MyDeepNS::DeepNestedStruct) SWIFT_NAME("DeepNestedStructTypedef.method(self:)");
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struct TopLevelStruct {
35+
struct StructInStruct {};
36+
};
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38+
void structInStruct_method(TopLevelStruct::StructInStruct) SWIFT_NAME("TopLevelStruct.StructInStruct.method(self:)");
39+
void structInStruct_invalidContext(TopLevelStruct::StructInStruct) SWIFT_NAME("TopLevelStruct::StructInStruct.method(self:)"); // expected-warning {{'swift_name' attribute has invalid identifier for the context name}}
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541
typedef int (^CallbackTy)(void);
642

743
class CXXClass {

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