| // 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_coverage.h" |
| |
| #include "base/no_destructor.h" |
| #include "base/synchronization/lock.h" |
| |
| extern "C" int __llvm_profile_dump(void); |
| |
| namespace base { |
| |
| void WriteClangCoverageProfile() { |
| // __llvm_profile_dump() guarantees that it will not dump coverage 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 coverage counters. |
| static base::NoDestructor<base::Lock> lock; |
| base::AutoLock auto_lock(*lock); |
| __llvm_profile_dump(); |
| } |
| |
| } // namespace base |
