1 // Copyright 2018 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "base/test/clang_profiling.h" 6 7 #include "base/no_destructor.h" 8 #include "base/synchronization/lock.h" 9 #include "build/build_config.h" 10 11 extern "C" int __llvm_profile_dump(void); 12 13 namespace base { 14 WriteClangProfilingProfile()15void WriteClangProfilingProfile() { 16 // __llvm_profile_dump() guarantees that it will not dump profiling 17 // information if it is being called twice or more. However, it is not thread 18 // safe, as it is supposed to be called from atexit() handler rather than 19 // being called directly from random places. Since we have to call it 20 // ourselves, we must ensure thread safety in order to prevent duplication of 21 // profiling counters. 22 static base::NoDestructor<base::Lock> lock; 23 base::AutoLock auto_lock(*lock); 24 25 // Fuchsia's profile runtime does not handle profile dumping. 26 #if !BUILDFLAG(IS_FUCHSIA) 27 __llvm_profile_dump(); 28 #endif // !BUILDFLAG(IS_FUCHSIA) 29 } 30 31 } // namespace base 32