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