1 // -*- C++ -*- std::terminate, std::unexpected and friends. 2 // Copyright (C) 1994-2022 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 "eh_term_handler.h" 30 #include <bits/exception_defines.h> 31 #include <bits/atomic_lockfree_defines.h> 32 33 #if ATOMIC_POINTER_LOCK_FREE < 2 34 #include <ext/concurrence.h> 35 namespace 36 { 37 __gnu_cxx::__mutex mx; 38 } 39 #endif 40 41 using namespace __cxxabiv1; 42 43 void 44 __cxxabiv1::__terminate (std::terminate_handler handler) throw () 45 { 46 __try 47 { 48 handler (); 49 std::abort (); 50 } 51 __catch(...) 52 { std::abort (); } 53 } 54 55 void 56 std::terminate () throw() 57 { 58 __cxxabiv1::__terminate (get_terminate ()); 59 } 60 61 #pragma GCC diagnostic ignored "-Wdeprecated-declarations" 62 void 63 __cxxabiv1::__unexpected (std::unexpected_handler handler) 64 { 65 handler(); 66 std::terminate (); 67 } 68 69 void 70 std::unexpected () 71 { 72 __unexpected (get_unexpected ()); 73 } 74 75 std::terminate_handler 76 std::set_terminate (std::terminate_handler func) throw() 77 { 78 if (!func) 79 func = _GLIBCXX_DEFAULT_TERM_HANDLER; 80 81 std::terminate_handler old; 82 #if ATOMIC_POINTER_LOCK_FREE > 1 83 __atomic_exchange (&__terminate_handler, &func, &old, __ATOMIC_ACQ_REL); 84 #else 85 __gnu_cxx::__scoped_lock l(mx); 86 old = __terminate_handler; 87 __terminate_handler = func; 88 #endif 89 return old; 90 } 91 92 std::terminate_handler 93 std::get_terminate () noexcept 94 { 95 std::terminate_handler func; 96 #if ATOMIC_POINTER_LOCK_FREE > 1 97 __atomic_load (&__terminate_handler, &func, __ATOMIC_ACQUIRE); 98 #else 99 __gnu_cxx::__scoped_lock l(mx); 100 func = __terminate_handler; 101 #endif 102 return func; 103 } 104 105 std::unexpected_handler 106 std::set_unexpected (std::unexpected_handler func) throw() 107 { 108 if (!func) 109 func = std::terminate; 110 111 std::unexpected_handler old; 112 #if ATOMIC_POINTER_LOCK_FREE > 1 113 __atomic_exchange (&__unexpected_handler, &func, &old, __ATOMIC_ACQ_REL); 114 #else 115 __gnu_cxx::__scoped_lock l(mx); 116 old = __unexpected_handler; 117 __unexpected_handler = func; 118 #endif 119 return old; 120 } 121 122 std::unexpected_handler 123 std::get_unexpected () noexcept 124 { 125 std::unexpected_handler func; 126 #if ATOMIC_POINTER_LOCK_FREE > 1 127 __atomic_load (&__unexpected_handler, &func, __ATOMIC_ACQUIRE); 128 #else 129 __gnu_cxx::__scoped_lock l(mx); 130 func = __unexpected_handler; 131 #endif 132 return func; 133 } 134