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111
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1 // Exception Handling support header for -*- C++ -*-
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2
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145
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3 // Copyright (C) 1995-2020 Free Software Foundation, Inc.
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111
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4 //
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5 // This file is part of GCC.
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6 //
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7 // GCC is free software; you can redistribute it and/or modify
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8 // it under the terms of the GNU General Public License as published by
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9 // the Free Software Foundation; either version 3, or (at your option)
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10 // any later version.
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11 //
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12 // GCC is distributed in the hope that it will be useful,
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13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 // GNU General Public License for more details.
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16 //
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17 // Under Section 7 of GPL version 3, you are granted additional
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18 // permissions described in the GCC Runtime Library Exception, version
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19 // 3.1, as published by the Free Software Foundation.
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20
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21 // You should have received a copy of the GNU General Public License and
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22 // a copy of the GCC Runtime Library Exception along with this program;
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23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 // <http://www.gnu.org/licenses/>.
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25
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26 /** @file exception
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27 * This is a Standard C++ Library header.
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28 */
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29
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30 #ifndef __EXCEPTION__
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31 #define __EXCEPTION__
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32
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33 #pragma GCC system_header
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34
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35 #pragma GCC visibility push(default)
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36
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37 #include <bits/c++config.h>
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38 #include <bits/exception.h>
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39
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40 extern "C++" {
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41
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42 namespace std
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43 {
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145
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44 /** @addtogroup exceptions
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45 * @{
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46 */
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47
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111
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48 /** If an %exception is thrown which is not listed in a function's
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49 * %exception specification, one of these may be thrown. */
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50 class bad_exception : public exception
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51 {
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52 public:
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53 bad_exception() _GLIBCXX_USE_NOEXCEPT { }
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54
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55 // This declaration is not useless:
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56 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
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57 virtual ~bad_exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
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58
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59 // See comment in eh_exception.cc.
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60 virtual const char*
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61 what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
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62 };
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63
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64 /// If you write a replacement %terminate handler, it must be of this type.
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65 typedef void (*terminate_handler) ();
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66
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67 /// If you write a replacement %unexpected handler, it must be of this type.
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68 typedef void (*unexpected_handler) ();
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69
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70 /// Takes a new handler function as an argument, returns the old function.
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71 terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT;
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72
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73 #if __cplusplus >= 201103L
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74 /// Return the current terminate handler.
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75 terminate_handler get_terminate() noexcept;
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76 #endif
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77
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78 /** The runtime will call this function if %exception handling must be
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79 * abandoned for any reason. It can also be called by the user. */
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80 void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
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81
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82 /// Takes a new handler function as an argument, returns the old function.
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83 unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT;
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84
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85 #if __cplusplus >= 201103L
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86 /// Return the current unexpected handler.
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87 unexpected_handler get_unexpected() noexcept;
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88 #endif
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89
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90 /** The runtime will call this function if an %exception is thrown which
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91 * violates the function's %exception specification. */
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92 void unexpected() __attribute__ ((__noreturn__));
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93
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94 /** [18.6.4]/1: 'Returns true after completing evaluation of a
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95 * throw-expression until either completing initialization of the
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96 * exception-declaration in the matching handler or entering @c unexpected()
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97 * due to the throw; or after entering @c terminate() for any reason
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98 * other than an explicit call to @c terminate(). [Note: This includes
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99 * stack unwinding [15.2]. end note]'
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100 *
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101 * 2: 'When @c uncaught_exception() is true, throwing an
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102 * %exception can result in a call of @c terminate()
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103 * (15.5.1).'
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104 */
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105 _GLIBCXX17_DEPRECATED
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106 bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
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107
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145
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108 #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++98
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109 #define __cpp_lib_uncaught_exceptions 201411L
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111
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110 /// The number of uncaught exceptions.
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111 int uncaught_exceptions() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
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112 #endif
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113
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114 // @} group exceptions
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115 } // namespace std
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116
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117 namespace __gnu_cxx
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118 {
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119 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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120
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121 /**
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122 * @brief A replacement for the standard terminate_handler which
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123 * prints more information about the terminating exception (if any)
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124 * on stderr.
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125 *
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126 * @ingroup exceptions
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127 *
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128 * Call
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129 * @code
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130 * std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
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131 * @endcode
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132 * to use. For more info, see
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133 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
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134 *
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135 * In 3.4 and later, this is on by default.
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136 */
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137 void __verbose_terminate_handler();
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138
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139 _GLIBCXX_END_NAMESPACE_VERSION
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140 } // namespace
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141
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142 } // extern "C++"
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143
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144 #pragma GCC visibility pop
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145
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146 #if (__cplusplus >= 201103L)
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147 #include <bits/exception_ptr.h>
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148 #include <bits/nested_exception.h>
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149 #endif
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150
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151 #endif
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