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91209d311d
Associated objects are actively dangerous there because they’re non-isolated actor state, and it’s “new” code wher no backward compatibility concerns that make it more difficult to ban this on other forms of classes. rdar://69769048
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===--- Class.h - Compiler/runtime class-metadata values -------*- C++ -*-===//
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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) 2014 - 2017 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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// This header provides target-independent information about class
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// metadata.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_ABI_CLASS_H
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#define SWIFT_ABI_CLASS_H
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#include <stdint.h>
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namespace swift {
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/// Objective-C class flags, stored in the ro-data.
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enum class ObjCClassFlags : uint32_t {
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/// This class is a metaclass.
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Meta = 0x00001,
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/// This class is a root class.
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Root = 0x00002,
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/// This class provides a non-trivial .cxx_construct or .cxx_destruct
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/// implementation.
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HasCXXStructors = 0x00004,
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/// This class has hidden visibility.
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Hidden = 0x00010,
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/// This class has the exception attribute.
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Exception = 0x00020,
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/// This class provides a metadata update callback trailing the ro-data.
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/// Note that we're re-using the obsolete flag above.
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HasMetadataUpdateCallback = 0x00040,
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/// (Obsolete) ARC-specific: this class has a .release_ivars method.
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HasIvarReleaser = 0x00040,
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/// This class implementation was compiled under ARC.
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CompiledByARC = 0x00080,
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/// This class provides a non-trivial .cxx_destruct method, but
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/// its .cxx_construct is trivial. For backwards compatibility,
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/// when setting this flag, HasCXXStructors must be set as well.
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HasCXXDestructorOnly = 0x00100,
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/// This class does not allow associated objects on instances.
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///
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/// Will cause the objc runtime to trap in objc_setAssociatedObject.
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ForbidsAssociatedObjects = 0x00400,
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};
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inline ObjCClassFlags &operator|=(ObjCClassFlags &lhs, ObjCClassFlags rhs) {
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lhs = ObjCClassFlags(uint32_t(lhs) | uint32_t(rhs));
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return lhs;
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}
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inline ObjCClassFlags operator|(ObjCClassFlags lhs, ObjCClassFlags rhs) {
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return (lhs |= rhs);
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}
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}
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#endif // SWIFT_ABI_CLASS_H
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