38 lines · cpp
1//===-- Implementation of exit --------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/stdlib/exit.h"10#include "src/__support/OSUtil/exit.h"11#include "src/__support/common.h"12#include "src/__support/macros/config.h"13 14namespace LIBC_NAMESPACE_DECL {15 16extern "C" void __cxa_finalize(void *);17 18// exit needs to clean up TLS and call associated destructors.19// TODO: Strictly speaking, it is not valid to call exit in overlay mode20// as we have no way to ensure system libc will call the TLS destructors.21// We should run exit related tests in hermetic mode but this is currently22// blocked by https://github.com/llvm/llvm-project/issues/133925.23extern "C" [[gnu::weak]] void __cxa_thread_finalize();24 25// TODO: use recursive mutex to protect this routine.26[[noreturn]] LLVM_LIBC_FUNCTION(void, exit, (int status)) {27// FIXME: The NVPTX target does not support external weak symbols correctly28// despite being an ELF platform. Disable pending a future split.29#if !defined(LIBC_TARGET_ARCH_IS_NVPTX)30 if (__cxa_thread_finalize)31 __cxa_thread_finalize();32#endif33 __cxa_finalize(nullptr);34 internal::exit(status);35}36 37} // namespace LIBC_NAMESPACE_DECL38