libcxxabi/src/cxa_handlers.h

   1 //===----------------------------------------------------------------------===//
   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 // This file implements the functionality associated with the terminate_handler,
   9 //   unexpected_handler, and new_handler.
  10 //===----------------------------------------------------------------------===//
  11
  12 #ifndef _CXA_HANDLERS_H
  13 #define _CXA_HANDLERS_H
  14
  15 #include "__cxxabi_config.h"
  16
  17 #include <exception>
  18
  19 namespace std
  20 {
  21
  22 _LIBCXXABI_HIDDEN _LIBCXXABI_NORETURN
  23 void
  24 __unexpected(unexpected_handler func);
  25
  26 _LIBCXXABI_HIDDEN _LIBCXXABI_NORETURN
  27 void
  28 __terminate(terminate_handler func) noexcept;
  29
  30 }  // std
  31
  32 extern "C"
  33 {
  34
  35 _LIBCXXABI_DATA_VIS extern void (*__cxa_terminate_handler)();
  36 _LIBCXXABI_DATA_VIS extern void (*__cxa_unexpected_handler)();
  37 _LIBCXXABI_DATA_VIS extern void (*__cxa_new_handler)();
  38
  39 /*
  40
  41     At some point in the future these three symbols will become
  42     C++11 atomic variables:
  43
  44     extern std::atomic<std::terminate_handler>  __cxa_terminate_handler;
  45     extern std::atomic<std::unexpected_handler> __cxa_unexpected_handler;
  46     extern std::atomic<std::new_handler>        __cxa_new_handler;
  47
  48     This change will not impact their ABI.  But it will allow for a
  49     portable performance optimization.
  50
  51 */
  52
  53 } // extern "C"
  54
  55 #endif // _CXA_HANDLERS_H