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1 // -*- C++ -*- std::terminate, std::unexpected and friends.
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2 // Copyright (C) 1994-2020 Free Software Foundation, Inc.
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3 //
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4 // This file is part of GCC.
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5 //
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6 // GCC is free software; you can redistribute it and/or modify
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7 // it under the terms of the GNU General Public License as published by
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8 // the Free Software Foundation; either version 3, or (at your option)
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9 // any later version.
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10 //
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11 // GCC is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15 //
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16 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 #include "typeinfo"
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26 #include "exception"
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27 #include <cstdlib>
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28 #include "unwind-cxx.h"
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29 #include "eh_term_handler.h"
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30 #include <bits/exception_defines.h>
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31 #include <bits/atomic_lockfree_defines.h>
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32
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33 #if ATOMIC_POINTER_LOCK_FREE < 2
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34 #include <ext/concurrence.h>
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35 namespace
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36 {
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37 __gnu_cxx::__mutex mx;
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38 }
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39 #endif
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40
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41 using namespace __cxxabiv1;
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42
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43 void
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44 __cxxabiv1::__terminate (std::terminate_handler handler) throw ()
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45 {
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46 __try
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47 {
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48 handler ();
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49 std::abort ();
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50 }
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51 __catch(...)
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52 { std::abort (); }
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53 }
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54
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55 void
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56 std::terminate () throw()
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57 {
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58 __terminate (get_terminate ());
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59 }
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60
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61 void
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62 __cxxabiv1::__unexpected (std::unexpected_handler handler)
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63 {
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64 handler();
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65 std::terminate ();
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66 }
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67
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68 void
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69 std::unexpected ()
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70 {
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71 __unexpected (get_unexpected ());
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72 }
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73
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74 std::terminate_handler
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75 std::set_terminate (std::terminate_handler func) throw()
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76 {
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77 if (!func)
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78 func = _GLIBCXX_DEFAULT_TERM_HANDLER;
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79
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80 std::terminate_handler old;
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81 #if ATOMIC_POINTER_LOCK_FREE > 1
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82 __atomic_exchange (&__terminate_handler, &func, &old, __ATOMIC_ACQ_REL);
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83 #else
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84 __gnu_cxx::__scoped_lock l(mx);
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85 old = __terminate_handler;
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86 __terminate_handler = func;
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87 #endif
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88 return old;
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89 }
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90
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91 std::terminate_handler
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92 std::get_terminate () noexcept
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93 {
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94 std::terminate_handler func;
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95 #if ATOMIC_POINTER_LOCK_FREE > 1
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96 __atomic_load (&__terminate_handler, &func, __ATOMIC_ACQUIRE);
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97 #else
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98 __gnu_cxx::__scoped_lock l(mx);
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99 func = __terminate_handler;
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100 #endif
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101 return func;
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102 }
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103
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104 std::unexpected_handler
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105 std::set_unexpected (std::unexpected_handler func) throw()
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106 {
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107 if (!func)
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108 func = std::terminate;
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109
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110 std::unexpected_handler old;
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111 #if ATOMIC_POINTER_LOCK_FREE > 1
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112 __atomic_exchange (&__unexpected_handler, &func, &old, __ATOMIC_ACQ_REL);
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113 #else
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114 __gnu_cxx::__scoped_lock l(mx);
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115 old = __unexpected_handler;
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116 __unexpected_handler = func;
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117 #endif
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118 return old;
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119 }
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120
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121 std::unexpected_handler
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122 std::get_unexpected () noexcept
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123 {
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124 std::unexpected_handler func;
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125 #if ATOMIC_POINTER_LOCK_FREE > 1
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126 __atomic_load (&__unexpected_handler, &func, __ATOMIC_ACQUIRE);
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127 #else
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128 __gnu_cxx::__scoped_lock l(mx);
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129 func = __unexpected_handler;
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130 #endif
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131 return func;
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132 }
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