libc/startup/baremetal/fini.cpp

   1 //===-- Implementation file of __libc_fini_array --------------------------===//
   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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/macros/config.h"
  10 #include <stddef.h>
  11 #include <stdint.h>
  12
  13 namespace LIBC_NAMESPACE_DECL {
  14
  15 extern "C" {
  16 extern uintptr_t __fini_array_start[];
  17 extern uintptr_t __fini_array_end[];
  18 }
  19
  20 using FiniCallback = void(void);
  21
  22 extern "C" void __libc_fini_array(void) {
  23   size_t fini_array_size = __fini_array_end - __fini_array_start;
  24   for (size_t i = fini_array_size; i > 0; --i)
  25     reinterpret_cast<FiniCallback *>(__fini_array_start[i - 1])();
  26 }
  27
  28 } // namespace LIBC_NAMESPACE_DECL