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ca48939816
The runtime that shipped with Swift 5.1 and earlier had a bug that interfered with backward deployment of binaries that dynamically check for protocol conformances on conditionally-available tests. This was fixed in the top-of-tree Swift runtime by https://github.com/apple/swift/pull/29887; however, that doesn't do much good for running binaries on older OSes that don't have that fix. In order for binaries built with a newer Swift compiler to run successfully on older OSes, introduce a compatibility hook that replaces the conformance cache implementation in the original OS runtime with a version based on the current implementation that has the fix for the protocol conformance bug. Fixes rdar://problem/59460603
31 lines
1.0 KiB
C++
31 lines
1.0 KiB
C++
//===--- Overrides.h --- Compat overrides for Swift 5.0 runtime ----s------===//
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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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// This file provides compatibility override hooks for Swift 5.0 runtimes.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/LLVM.h"
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#include "swift/Runtime/Metadata.h"
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namespace swift {
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using ConformsToProtocol_t =
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const WitnessTable *(const Metadata *, const ProtocolDescriptor *);
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const WitnessTable *
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swift50override_conformsToProtocol(const Metadata * const type,
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const ProtocolDescriptor *protocol,
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ConformsToProtocol_t *original);
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}
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