1 // Exception Handling support header for -*- C++ -*- 2 3 // Copyright (C) 1995-2014 Free Software Foundation, Inc. 4 // 5 // This file is part of GCC. 6 // 7 // GCC is free software; you can redistribute it and/or modify 8 // it under the terms of the GNU General Public License as published by 9 // the Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 // 12 // GCC is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 // 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file exception 27 * This is a Standard C++ Library header. 28 */ 29 30 #ifndef __EXCEPTION__ 31 #define __EXCEPTION__ 32 33 #pragma GCC system_header 34 35 #pragma GCC visibility push(default) 36 37 #include <bits/c++config.h> 38 #include <bits/atomic_lockfree_defines.h> 39 40 extern "C++" { 41 42 namespace std 43 { 44 /** 45 * @defgroup exceptions Exceptions 46 * @ingroup diagnostics 47 * 48 * Classes and functions for reporting errors via exception classes. 49 * @{ 50 */ 51 52 /** 53 * @brief Base class for all library exceptions. 54 * 55 * This is the base class for all exceptions thrown by the standard 56 * library, and by certain language expressions. You are free to derive 57 * your own %exception classes, or use a different hierarchy, or to 58 * throw non-class data (e.g., fundamental types). 59 */ 60 class exception 61 { 62 public: 63 exception() _GLIBCXX_USE_NOEXCEPT { } 64 virtual ~exception() _GLIBCXX_USE_NOEXCEPT; 65 66 /** Returns a C-style character string describing the general cause 67 * of the current error. */ 68 virtual const char* what() const _GLIBCXX_USE_NOEXCEPT; 69 }; 70 71 /** If an %exception is thrown which is not listed in a function's 72 * %exception specification, one of these may be thrown. */ 73 class bad_exception : public exception 74 { 75 public: 76 bad_exception() _GLIBCXX_USE_NOEXCEPT { } 77 78 // This declaration is not useless: 79 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 80 virtual ~bad_exception() _GLIBCXX_USE_NOEXCEPT; 81 82 // See comment in eh_exception.cc. 83 virtual const char* what() const _GLIBCXX_USE_NOEXCEPT; 84 }; 85 86 /// If you write a replacement %terminate handler, it must be of this type. 87 typedef void (*terminate_handler) (); 88 89 /// If you write a replacement %unexpected handler, it must be of this type. 90 typedef void (*unexpected_handler) (); 91 92 /// Takes a new handler function as an argument, returns the old function. 93 terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT; 94 95 #if __cplusplus >= 201103L 96 /// Return the current terminate handler. 97 terminate_handler get_terminate() noexcept; 98 #endif 99 100 /** The runtime will call this function if %exception handling must be 101 * abandoned for any reason. It can also be called by the user. */ 102 void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__)); 103 104 /// Takes a new handler function as an argument, returns the old function. 105 unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT; 106 107 #if __cplusplus >= 201103L 108 /// Return the current unexpected handler. 109 unexpected_handler get_unexpected() noexcept; 110 #endif 111 112 /** The runtime will call this function if an %exception is thrown which 113 * violates the function's %exception specification. */ 114 void unexpected() __attribute__ ((__noreturn__)); 115 116 /** [18.6.4]/1: 'Returns true after completing evaluation of a 117 * throw-expression until either completing initialization of the 118 * exception-declaration in the matching handler or entering @c unexpected() 119 * due to the throw; or after entering @c terminate() for any reason 120 * other than an explicit call to @c terminate(). [Note: This includes 121 * stack unwinding [15.2]. end note]' 122 * 123 * 2: 'When @c uncaught_exception() is true, throwing an 124 * %exception can result in a call of @c terminate() 125 * (15.5.1).' 126 */ 127 bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 128 129 // @} group exceptions 130 } // namespace std 131 132 namespace __gnu_cxx 133 { 134 _GLIBCXX_BEGIN_NAMESPACE_VERSION 135 136 /** 137 * @brief A replacement for the standard terminate_handler which 138 * prints more information about the terminating exception (if any) 139 * on stderr. 140 * 141 * @ingroup exceptions 142 * 143 * Call 144 * @code 145 * std::set_terminate(__gnu_cxx::__verbose_terminate_handler) 146 * @endcode 147 * to use. For more info, see 148 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html 149 * 150 * In 3.4 and later, this is on by default. 151 */ 152 void __verbose_terminate_handler(); 153 154 _GLIBCXX_END_NAMESPACE_VERSION 155 } // namespace 156 157 } // extern "C++" 158 159 #pragma GCC visibility pop 160 161 #if (__cplusplus >= 201103L) && (ATOMIC_INT_LOCK_FREE > 1) 162 #include <bits/exception_ptr.h> 163 #include <bits/nested_exception.h> 164 #endif 165 166 #endif 167
