1  //===------------------------- cxa_handlers.h -----------------------------===//
 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