libstdc++
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00001 // Exception Handling support header (exception_ptr class) for -*- C++ -*- 00002 00003 // Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation 00004 // 00005 // This file is part of GCC. 00006 // 00007 // GCC is free software; you can redistribute it and/or modify 00008 // it under the terms of the GNU General Public License as published by 00009 // the Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 // 00012 // GCC is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 // 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file bits/exception_ptr.h 00027 * This is an internal header file, included by other library headers. 00028 * Do not attempt to use it directly. @headername{exception} 00029 */ 00030 00031 #ifndef _EXCEPTION_PTR_H 00032 #define _EXCEPTION_PTR_H 00033 00034 #pragma GCC visibility push(default) 00035 00036 #include <bits/c++config.h> 00037 #include <bits/exception_defines.h> 00038 00039 #if ATOMIC_INT_LOCK_FREE < 2 00040 # error This platform does not support exception propagation. 00041 #endif 00042 00043 extern "C++" { 00044 00045 namespace std 00046 { 00047 /** 00048 * @addtogroup exceptions 00049 * @{ 00050 */ 00051 namespace __exception_ptr 00052 { 00053 class exception_ptr; 00054 } 00055 00056 using __exception_ptr::exception_ptr; 00057 00058 /** Obtain an exception_ptr to the currently handled exception. If there 00059 * is none, or the currently handled exception is foreign, return the null 00060 * value. 00061 */ 00062 exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT; 00063 00064 /// Throw the object pointed to by the exception_ptr. 00065 void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__)); 00066 00067 namespace __exception_ptr 00068 { 00069 /** 00070 * @brief An opaque pointer to an arbitrary exception. 00071 * @ingroup exceptions 00072 */ 00073 class exception_ptr 00074 { 00075 void* _M_exception_object; 00076 00077 explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT; 00078 00079 void _M_addref() _GLIBCXX_USE_NOEXCEPT; 00080 void _M_release() _GLIBCXX_USE_NOEXCEPT; 00081 00082 void *_M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__)); 00083 00084 friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT; 00085 friend void std::rethrow_exception(exception_ptr); 00086 00087 public: 00088 exception_ptr() _GLIBCXX_USE_NOEXCEPT; 00089 00090 exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT; 00091 00092 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00093 exception_ptr(nullptr_t) noexcept 00094 : _M_exception_object(0) 00095 { } 00096 00097 exception_ptr(exception_ptr&& __o) noexcept 00098 : _M_exception_object(__o._M_exception_object) 00099 { __o._M_exception_object = 0; } 00100 #endif 00101 00102 #if !defined (__GXX_EXPERIMENTAL_CXX0X__) || defined (_GLIBCXX_EH_PTR_COMPAT) 00103 typedef void (exception_ptr::*__safe_bool)(); 00104 00105 // For construction from nullptr or 0. 00106 exception_ptr(__safe_bool) _GLIBCXX_USE_NOEXCEPT; 00107 #endif 00108 00109 exception_ptr& 00110 operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT; 00111 00112 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00113 exception_ptr& 00114 operator=(exception_ptr&& __o) noexcept 00115 { 00116 exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this); 00117 return *this; 00118 } 00119 #endif 00120 00121 ~exception_ptr() _GLIBCXX_USE_NOEXCEPT; 00122 00123 void 00124 swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT; 00125 00126 #ifdef _GLIBCXX_EH_PTR_COMPAT 00127 // Retained for compatibility with CXXABI_1.3. 00128 void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT 00129 __attribute__ ((__const__)); 00130 bool operator!() const _GLIBCXX_USE_NOEXCEPT 00131 __attribute__ ((__pure__)); 00132 operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT; 00133 #endif 00134 00135 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00136 explicit operator bool() const 00137 { return _M_exception_object; } 00138 #endif 00139 00140 friend bool 00141 operator==(const exception_ptr&, const exception_ptr&) 00142 _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00143 00144 const class type_info* 00145 __cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT 00146 __attribute__ ((__pure__)); 00147 }; 00148 00149 bool 00150 operator==(const exception_ptr&, const exception_ptr&) 00151 _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00152 00153 bool 00154 operator!=(const exception_ptr&, const exception_ptr&) 00155 _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); 00156 00157 inline void 00158 swap(exception_ptr& __lhs, exception_ptr& __rhs) 00159 { __lhs.swap(__rhs); } 00160 00161 } // namespace __exception_ptr 00162 00163 00164 /// Obtain an exception_ptr pointing to a copy of the supplied object. 00165 template<typename _Ex> 00166 exception_ptr 00167 copy_exception(_Ex __ex) _GLIBCXX_USE_NOEXCEPT 00168 { 00169 __try 00170 { 00171 #ifdef __EXCEPTIONS 00172 throw __ex; 00173 #endif 00174 } 00175 __catch(...) 00176 { 00177 return current_exception(); 00178 } 00179 } 00180 00181 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00182 // 1130. copy_exception name misleading 00183 /// Obtain an exception_ptr pointing to a copy of the supplied object. 00184 template<typename _Ex> 00185 exception_ptr 00186 make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT 00187 { return std::copy_exception<_Ex>(__ex); } 00188 00189 // @} group exceptions 00190 } // namespace std 00191 00192 } // extern "C++" 00193 00194 #pragma GCC visibility pop 00195 00196 #endif