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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
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
//===--- Overrides.cpp - Compat override table for Swift 5.1 runtime ------===//
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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 5.1 runtimes.
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//
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//===----------------------------------------------------------------------===//
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#include "../../public/runtime/CompatibilityOverride.h"
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#include "Overrides.h"
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#include <dlfcn.h>
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#include <mach-o/dyld.h>
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#include <mach-o/getsect.h>
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using namespace swift;
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struct OverrideSection {
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uintptr_t version;
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#define OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
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Override_ ## name name;
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#include "../../public/runtime/CompatibilityOverride.def"
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};
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OverrideSection Swift51Overrides
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__attribute__((used, section("__DATA,__swift51_hooks"))) = {
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.version = 0,
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.conformsToSwiftProtocol = swift51override_conformsToSwiftProtocol,
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};
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// Allow this library to get force-loaded by autolinking
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__attribute__((weak, visibility("hidden")))
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extern "C"
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char _swift_FORCE_LOAD_$_swiftCompatibility51 = 0;
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