1 // -*- C++ -*- std::terminate, std::unexpected and friends. 2 // Copyright (C) 1994-2018 Free Software Foundation, Inc. 3 // 4 // This file is part of GCC. 5 // 6 // GCC is free software; you can redistribute it and/or modify 7 // it under the terms of the GNU General Public License as published by 8 // the Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 // 11 // GCC is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 // 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 #include "typeinfo" 26 #include "exception" 27 #include <cstdlib> 28 #include "unwind-cxx.h" 29 #include <bits/exception_defines.h> 30 #include <bits/atomic_lockfree_defines.h> 31 32 #if ATOMIC_POINTER_LOCK_FREE < 2 33 #include <ext/concurrence.h> 34 namespace 35 { 36 __gnu_cxx::__mutex mx; 37 } 38 #endif 39 40 using namespace __cxxabiv1; 41 42 void 43 __cxxabiv1::__terminate (std::terminate_handler handler) throw () 44 { 45 __try 46 { 47 handler (); 48 std::abort (); 49 } 50 __catch(...) 51 { std::abort (); } 52 } 53 54 void 55 std::terminate () throw() 56 { 57 __terminate (get_terminate ()); 58 } 59 60 void 61 __cxxabiv1::__unexpected (std::unexpected_handler handler) 62 { 63 handler(); 64 std::terminate (); 65 } 66 67 void 68 std::unexpected () 69 { 70 __unexpected (get_unexpected ()); 71 } 72 73 std::terminate_handler 74 std::set_terminate (std::terminate_handler func) throw() 75 { 76 std::terminate_handler old; 77 #if ATOMIC_POINTER_LOCK_FREE > 1 78 __atomic_exchange (&__terminate_handler, &func, &old, __ATOMIC_ACQ_REL); 79 #else 80 __gnu_cxx::__scoped_lock l(mx); 81 old = __terminate_handler; 82 __terminate_handler = func; 83 #endif 84 return old; 85 } 86 87 std::terminate_handler 88 std::get_terminate () noexcept 89 { 90 std::terminate_handler func; 91 #if ATOMIC_POINTER_LOCK_FREE > 1 92 __atomic_load (&__terminate_handler, &func, __ATOMIC_ACQUIRE); 93 #else 94 __gnu_cxx::__scoped_lock l(mx); 95 func = __terminate_handler; 96 #endif 97 return func; 98 } 99 100 std::unexpected_handler 101 std::set_unexpected (std::unexpected_handler func) throw() 102 { 103 std::unexpected_handler old; 104 #if ATOMIC_POINTER_LOCK_FREE > 1 105 __atomic_exchange (&__unexpected_handler, &func, &old, __ATOMIC_ACQ_REL); 106 #else 107 __gnu_cxx::__scoped_lock l(mx); 108 old = __unexpected_handler; 109 __unexpected_handler = func; 110 #endif 111 return old; 112 } 113 114 std::unexpected_handler 115 std::get_unexpected () noexcept 116 { 117 std::unexpected_handler func; 118 #if ATOMIC_POINTER_LOCK_FREE > 1 119 __atomic_load (&__unexpected_handler, &func, __ATOMIC_ACQUIRE); 120 #else 121 __gnu_cxx::__scoped_lock l(mx); 122 func = __unexpected_handler; 123 #endif 124 return func; 125 } 126