libstdc++-v3/libsupc++/exception

   1 // Exception Handling support header for -*- C++ -*-
   2
   3 // Copyright (C) 1995-2024 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 #include <bits/c++config.h>
  36 #include <bits/exception.h>
  37
  38 #define __glibcxx_want_uncaught_exceptions
  39 #include <bits/version.h>
  40
  41 extern "C++" {
  42
  43 namespace std _GLIBCXX_VISIBILITY(default)
  44 {
  45   /** @addtogroup exceptions
  46    *  @{
  47    */
  48
  49   /** If an %exception is thrown which is not listed in a function's
  50    *  %exception specification, one of these may be thrown.
  51    *
  52    *  @ingroup exceptions
  53    */
  54   class bad_exception : public exception
  55   {
  56   public:
  57     bad_exception() _GLIBCXX_USE_NOEXCEPT { }
  58
  59     // This declaration is not useless:
  60     // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
  61     virtual ~bad_exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
  62
  63     // See comment in eh_exception.cc.
  64     virtual const char*
  65     what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
  66   };
  67
  68   /// If you write a replacement %terminate handler, it must be of this type.
  69   typedef void (*terminate_handler) ();
  70
  71   /// Takes a new handler function as an argument, returns the old function.
  72   terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT;
  73
  74 #if __cplusplus >= 201103L
  75   /// Return the current terminate handler.
  76   terminate_handler get_terminate() noexcept;
  77 #endif
  78
  79   /** The runtime will call this function if %exception handling must be
  80    *  abandoned for any reason.  It can also be called by the user.  */
  81   void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__,__cold__));
  82
  83 #if __cplusplus < 201703L || (__cplusplus <= 202002L && _GLIBCXX_USE_DEPRECATED)
  84   /// If you write a replacement %unexpected handler, it must be of this type.
  85   typedef void (*_GLIBCXX11_DEPRECATED unexpected_handler) ();
  86
  87   /** Takes a new handler function as an argument, returns the old function.
  88    *
  89    * @deprecated Removed from the C++ standard in C++17
  90    */
  91   _GLIBCXX11_DEPRECATED
  92   unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT;
  93
  94 #if __cplusplus >= 201103L
  95   /** Return the current unexpected handler.
  96    *
  97    * @since C++11
  98    * @deprecated Removed from the C++ standard in C++17
  99    */
 100   _GLIBCXX11_DEPRECATED
 101   unexpected_handler get_unexpected() noexcept;
 102 #endif
 103
 104   /** The runtime will call this function if an %exception is thrown which
 105    *  violates the function's %exception specification.
 106    *
 107    * @deprecated Removed from the C++ standard in C++17
 108    */
 109   _GLIBCXX11_DEPRECATED
 110   void unexpected() __attribute__ ((__noreturn__,__cold__));
 111 #endif
 112
 113   /** [18.6.4]/1:  'Returns true after completing evaluation of a
 114    *  throw-expression until either completing initialization of the
 115    *  exception-declaration in the matching handler or entering `unexpected()`
 116    *  due to the throw; or after entering `terminate()` for any reason
 117    *  other than an explicit call to `terminate()`.  [Note: This includes
 118    *  stack unwinding [15.2].  end note]'
 119    *
 120    *  2: 'When `uncaught_exception()` is true, throwing an
 121    *  %exception can result in a call of 1terminate()`
 122    *  (15.5.1).'
 123    */
 124   _GLIBCXX17_DEPRECATED_SUGGEST("std::uncaught_exceptions()")
 125   bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
 126
 127 #ifdef __cpp_lib_uncaught_exceptions // C++ >= 17 || GNU++ >= 03
 128   /** The number of uncaught exceptions.
 129    *  @since C++17, or any non-strict mode, e.g. `-std=gnu++98`
 130    *  @see uncaught_exception()
 131    */
 132   int uncaught_exceptions() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
 133 #endif
 134
 135   /// @} group exceptions
 136 } // namespace std
 137
 138 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
 139 {
 140 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 141
 142   /**
 143    *  @brief A replacement for the standard terminate_handler which
 144    *  prints more information about the terminating exception (if any)
 145    *  on stderr.
 146    *
 147    *  @ingroup exceptions
 148    *
 149    *  Call
 150    *   @code
 151    *     std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
 152    *   @endcode
 153    *  to use.  For more info, see
 154    *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
 155    *
 156    *  In 3.4 and later, this is on by default.
 157    */
 158   void __verbose_terminate_handler();
 159
 160 _GLIBCXX_END_NAMESPACE_VERSION
 161 } // namespace
 162
 163 } // extern "C++"
 164
 165 #if (__cplusplus >= 201103L)
 166 #include <bits/exception_ptr.h>
 167 #include <bits/nested_exception.h>
 168 #endif
 169
 170 #endif