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b3ed7aee24
This adds in hooks so that the new hash/isEqual interop (which bridges Obj-C hash/isEqual: calls to the corresponding Swift Hashable/Equatable conformances) can be selectively disabled based on the OS and/or client. For now, enable the new semantics everywhere except Apple platforms (which have legacy apps that may be relying on the old semantics).
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===--- Bincompat.h - Binary compatibility checks. -------------*- 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 - 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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// Checks for enabling binary compatibility workarounds.
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//
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//===----------------------------------------------------------------------===//
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namespace swift {
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namespace runtime {
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namespace bincompat {
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/// Whether protocol conformance iteration should be reversed, to prefer
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/// conformances from images that are later in the list over earlier ones.
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/// Default is false starting with Swift 5.4.
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bool useLegacyProtocolConformanceReverseIteration();
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/// Whether we should crash when we encounter a non-nullable Obj-C
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/// reference with a null value as the source of a cast.
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/// Default is true starting with Swift 5.4.
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bool useLegacyPermissiveObjCNullSemanticsInCasting();
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/// Whether we should use the legacy semantics for casting nil optionals
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/// to nested optionals
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bool useLegacyOptionalNilInjectionInCasting();
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/// Whether to use legacy semantics when boxing Swift values for
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/// Obj-C interop
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bool useLegacyObjCBoxingInCasting();
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/// Whether to use legacy semantics when unboxing __SwiftValue
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bool useLegacySwiftValueUnboxingInCasting();
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/// Legacy semantics use trivial implementations for -hashValue/-isEqual:
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/// requests from ObjC to Swift values.
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/// New semantics attempt to dispatch to Swift Hashable/Equatable conformances
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/// if present.
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bool useLegacySwiftObjCHashing();
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} // namespace bincompat
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} // namespace runtime
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} // namespace swift
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