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8ed8a28478
On Darwin, `RTLD_NEXT` doesn't do what we need it to here, with the result that if `libswiftCore`'s TSan initializer gets found first, then `libswift_Concurrency` won't have its initializer called at all, in spite of us using `RTLD_NEXT` to find the next definition. Fix this by centralising the initializer in `libswiftCore` instead. rdar://110665213
57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
//===--- ThreadSanitizer.cpp - Thread Sanitizer support -------------------===//
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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) 2023 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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// Helper functions for code that needs to integrate with the thread
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// sanitizer. In particular, TSan can't see inside the runtime libraries,
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// so we occasionally need to give it a hint that we're doing synchronization
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// in order to avoid false positives.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Threading/ThreadSanitizer.h"
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#include "swift/shims/Visibility.h"
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#include <cstdio>
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namespace swift {
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namespace threading_impl {
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SWIFT_RUNTIME_EXPORT bool _swift_tsan_enabled = false;
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SWIFT_RUNTIME_EXPORT void (*_swift_tsan_acquire)(const void *) = nullptr;
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SWIFT_RUNTIME_EXPORT void (*_swift_tsan_release)(const void *) = nullptr;
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#if __has_include(<dlfcn.h>)
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#include <dlfcn.h>
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// The TSan library code will call this function when it starts up
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SWIFT_RUNTIME_EXPORT
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void __tsan_on_initialize() {
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_swift_tsan_enabled = true;
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_swift_tsan_acquire = (void (*)(const void *))dlsym(RTLD_DEFAULT,
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"__tsan_acquire");
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_swift_tsan_release = (void (*)(const void *))dlsym(RTLD_DEFAULT,
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"__tsan_release");
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// Always call through to the next image; this won't work on macOS, but it's
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// important on Linux to allow others to hook into the thread sanitizer if
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// they wish.
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void (*next_init)(void);
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next_init = (void (*)(void))dlsym(RTLD_NEXT, "__tsan_on_initialize");
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if (next_init) {
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next_init();
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}
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}
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#endif
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} // namespace threading_impl
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} // namespace swift
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