// Copyright 2018 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "base/test/clang_profiling.h" #include "base/no_destructor.h" #include "base/synchronization/lock.h" #include "build/build_config.h" extern "C" int __llvm_profile_dump(void); namespace base { void WriteClangProfilingProfile() { // __llvm_profile_dump() guarantees that it will not dump profiling // information if it is being called twice or more. However, it is not thread // safe, as it is supposed to be called from atexit() handler rather than // being called directly from random places. Since we have to call it // ourselves, we must ensure thread safety in order to prevent duplication of // profiling counters. static base::NoDestructor lock; base::AutoLock auto_lock(*lock); // Fuchsia's profile runtime does not handle profile dumping. #if !BUILDFLAG(IS_FUCHSIA) __llvm_profile_dump(); #endif // !BUILDFLAG(IS_FUCHSIA) } } // namespace base