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//===--- FoundationSupport.cpp - Support functions for Foundation ---------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Helper functions for the Foundation framework.
//
//===----------------------------------------------------------------------===//
#include "swift/Runtime/FoundationSupport.h"
#if SWIFT_OBJC_INTEROP
#include "swift/Runtime/Metadata.h"
#include "swift/Runtime/HeapObject.h"
using namespace swift;
/// Returns a boolean indicating whether the Objective-C name of a class type is
/// stable across executions, i.e., if the class name is safe to serialize. (The
/// names of private and local types are unstable.)
bool
swift::_swift_isObjCTypeNameSerializable(Class theClass) {
auto type = (AnyClassMetadata *)theClass;
switch (type->getKind()) {
case MetadataKind::ObjCClassWrapper:
case MetadataKind::ForeignClass:
case MetadataKind::ForeignReferenceType:
return true;
case MetadataKind::Class: {
// Pure ObjC classes always have stable names.
if (type->isPureObjC())
return true;
auto cls = static_cast<const ClassMetadata *>(type);
// Peek through artificial subclasses.
if (cls->isArtificialSubclass()) {
cls = cls->Superclass;
}
// A custom ObjC name is always considered stable.
if (cls->getFlags() & ClassFlags::HasCustomObjCName)
return true;
// Otherwise the name is stable if the class has no anonymous ancestor context.
auto desc = static_cast<const ContextDescriptor *>(cls->getDescription());
while (desc) {
if (desc->getKind() == ContextDescriptorKind::Anonymous) {
return false;
}
desc = desc->Parent.get();
}
return true;
}
default:
return false;
}
}
#endif // SWIFT_OBJC_INTEROP
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