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2884ddbc3e
These changes are needed to get things building with a C11 threads shim header on macOS. rdar://90776105
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
//===--- ProtocolConformance.cpp - Swift protocol conformance checking ----===//
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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 - 2019 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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// Runtime support for dynamic replaceable functions.
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//
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// This implementation is intended to be backward-deployed into Swift 5.0
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// runtimes.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Runtime/Exclusivity.h"
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#include "swift/Runtime/FunctionReplacement.h"
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#include "swift/Threading/ThreadLocalStorage.h"
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using namespace swift;
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namespace {
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// Some threading libraries will need a global constructor here; that is
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// unavoidable in the general case, so turn off the warning just for this line.
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wglobal-constructors"
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SWIFT_THREAD_LOCAL_TYPE(uintptr_t, SWIFT_COMPATIBILITY_50_TLS_KEY) compat50Key;
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#pragma clang diagnostic pop
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} // namespace
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__attribute__((visibility("hidden"), weak))
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extern "C" char *swift_getFunctionReplacement50(char **ReplFnPtr, char *CurrFn) {
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// Call the current implementation if it is available.
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if (swift_getFunctionReplacement)
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return swift_getFunctionReplacement(ReplFnPtr, CurrFn);
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char *ReplFn = *ReplFnPtr;
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char *RawReplFn = ReplFn;
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#if SWIFT_PTRAUTH
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RawReplFn = ptrauth_strip(RawReplFn, ptrauth_key_function_pointer);
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#endif
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if (RawReplFn == CurrFn)
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return nullptr;
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auto origKey = compat50Key.get();
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if ((origKey & 0x1) != 0) {
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auto mask = ((uintptr_t)-1) < 1;
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auto resetKey = origKey & mask;
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compat50Key.set(resetKey);
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return nullptr;
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}
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return ReplFn;
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}
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__attribute__((visibility("hidden"), weak))
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extern "C" char *swift_getOrigOfReplaceable50(char **OrigFnPtr) {
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// Call the current implementation if it is available.
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if (swift_getOrigOfReplaceable)
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return swift_getOrigOfReplaceable(OrigFnPtr);
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char *OrigFn = *OrigFnPtr;
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auto origKey = compat50Key.get();
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auto newKey = origKey | 0x1;
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compat50Key.set(newKey);
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return OrigFn;
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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_$_swiftCompatibilityDynamicReplacements = 0;
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