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f5bdb858e0
Moved all the threading code to one place. Added explicit support for Darwin, Linux, Pthreads, C11 threads and Win32 threads, including new implementations of Once for Linux, Pthreads, C11 and Win32. rdar://90776105
71 lines
2.3 KiB
C++
71 lines
2.3 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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__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 =
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(uintptr_t)swift::tls_get(SWIFT_COMPATIBILITY_50_TLS_KEY);
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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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swift::tls_set(SWIFT_COMPATIBILITY_50_TLS_KEY, (void *)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 =
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(uintptr_t)swift::tls_get(SWIFT_COMPATIBILITY_50_TLS_KEY);
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auto newKey = origKey | 0x1;
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swift::tls_set(SWIFT_COMPATIBILITY_50_TLS_KEY, (void *)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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