libstdc++
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00001 // Exception Handling support header for -*- C++ -*- 00002 00003 // Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 00004 // 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 00005 // Free Software Foundation 00006 // 00007 // This file is part of GCC. 00008 // 00009 // GCC is free software; you can redistribute it and/or modify 00010 // it under the terms of the GNU General Public License as published by 00011 // the Free Software Foundation; either version 3, or (at your option) 00012 // any later version. 00013 // 00014 // GCC is distributed in the hope that it will be useful, 00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 // GNU General Public License for more details. 00018 // 00019 // Under Section 7 of GPL version 3, you are granted additional 00020 // permissions described in the GCC Runtime Library Exception, version 00021 // 3.1, as published by the Free Software Foundation. 00022 00023 // You should have received a copy of the GNU General Public License and 00024 // a copy of the GCC Runtime Library Exception along with this program; 00025 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00026 // <http://www.gnu.org/licenses/>. 00027 00028 /** @file exception 00029 * This is a Standard C++ Library header. 00030 */ 00031 00032 #ifndef __EXCEPTION__ 00033 #define __EXCEPTION__ 00034 00035 #pragma GCC system_header 00036 00037 #pragma GCC visibility push(default) 00038 00039 #include <bits/c++config.h> 00040 #include <bits/atomic_lockfree_defines.h> 00041 00042 extern "C++" { 00043 00044 namespace std 00045 { 00046 /** 00047 * @defgroup exceptions Exceptions 00048 * @ingroup diagnostics 00049 * 00050 * Classes and functions for reporting errors via exception classes. 00051 * @{ 00052 */ 00053 00054 /** 00055 * @brief Base class for all library exceptions. 00056 * 00057 * This is the base class for all exceptions thrown by the standard 00058 * library, and by certain language expressions. You are free to derive 00059 * your own %exception classes, or use a different hierarchy, or to 00060 * throw non-class data (e.g., fundamental types). 00061 */ 00062 class exception 00063 { 00064 public: 00065 exception() _GLIBCXX_USE_NOEXCEPT { } 00066 virtual ~exception() _GLIBCXX_USE_NOEXCEPT; 00067 00068 /** Returns a C-style character string describing the general cause 00069 * of the current error. */ 00070 virtual const char* what() const _GLIBCXX_USE_NOEXCEPT; 00071 }; 00072 00073 /** If an %exception is thrown which is not listed in a function's 00074 * %exception specification, one of these may be thrown. */ 00075 class bad_exception : public exception 00076 { 00077 public: 00078 bad_exception() _GLIBCXX_USE_NOEXCEPT { } 00079 00080 // This declaration is not useless: 00081 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 00082 virtual ~bad_exception() _GLIBCXX_USE_NOEXCEPT; 00083 00084 // See comment in eh_exception.cc. 00085 virtual const char* what() const _GLIBCXX_USE_NOEXCEPT; 00086 }; 00087 00088 /// If you write a replacement %terminate handler, it must be of this type. 00089 typedef void (*terminate_handler) (); 00090 00091 /// If you write a replacement %unexpected handler, it must be of this type. 00092 typedef void (*unexpected_handler) (); 00093 00094 /// Takes a new handler function as an argument, returns the old function. 00095 terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT; 00096 00097 /** The runtime will call this function if %exception handling must be 00098 * abandoned for any reason. It can also be called by the user. */ 00099 void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__)); 00100 00101 /// Takes a new handler function as an argument, returns the old function. 00102 unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT; 00103 00104 /** The runtime will call this function if an %exception is thrown which 00105 * violates the function's %exception specification. */ 00106 void unexpected() __attribute__ ((__noreturn__)); 00107 00108 /** [18.6.4]/1: 'Returns true after completing evaluation of a 00109 * throw-expression until either completing initialization of the 00110 * exception-declaration in the matching handler or entering @c unexpected() 00111 * due to the throw; or after entering @c terminate() for any reason 00112 * other than an explicit call to @c terminate(). [Note: This includes 00113 * stack unwinding [15.2]. end note]' 00114 * 00115 * 2: 'When @c uncaught_exception() is true, throwing an 00116 * %exception can result in a call of @c terminate() 00117 * (15.5.1).' 00118 */ 00119 bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00120 00121 // @} group exceptions 00122 } // namespace std 00123 00124 namespace __gnu_cxx 00125 { 00126 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00127 00128 /** 00129 * @brief A replacement for the standard terminate_handler which 00130 * prints more information about the terminating exception (if any) 00131 * on stderr. 00132 * 00133 * @ingroup exceptions 00134 * 00135 * Call 00136 * @code 00137 * std::set_terminate(__gnu_cxx::__verbose_terminate_handler) 00138 * @endcode 00139 * to use. For more info, see 00140 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html 00141 * 00142 * In 3.4 and later, this is on by default. 00143 */ 00144 void __verbose_terminate_handler(); 00145 00146 _GLIBCXX_END_NAMESPACE_VERSION 00147 } // namespace 00148 00149 } // extern "C++" 00150 00151 #pragma GCC visibility pop 00152 00153 #if defined(__GXX_EXPERIMENTAL_CXX0X__) && (ATOMIC_INT_LOCK_FREE > 1) 00154 #include <bits/exception_ptr.h> 00155 #include <bits/nested_exception.h> 00156 #endif 00157 00158 #endif