1// Exception Handling support header for -*- C++ -*-
2
3// Copyright (C) 1995-2020 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/exception.h>
39
40extern "C++" {
41
42namespace std
43{
44  /** @addtogroup exceptions
45   *  @{
46   */
47
48  /** If an %exception is thrown which is not listed in a function's
49   *  %exception specification, one of these may be thrown.  */
50  class bad_exception : public exception
51  {
52  public:
53    bad_exception() _GLIBCXX_USE_NOEXCEPT { }
54
55    // This declaration is not useless:
56    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
57    virtual ~bad_exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
58
59    // See comment in eh_exception.cc.
60    virtual const char*
61    what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
62  };
63
64  /// If you write a replacement %terminate handler, it must be of this type.
65  typedef void (*terminate_handler) ();
66
67  /// If you write a replacement %unexpected handler, it must be of this type.
68  typedef void (*unexpected_handler) ();
69
70  /// Takes a new handler function as an argument, returns the old function.
71  terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT;
72
73#if __cplusplus >= 201103L
74  /// Return the current terminate handler.
75  terminate_handler get_terminate() noexcept;
76#endif
77
78  /** The runtime will call this function if %exception handling must be
79   *  abandoned for any reason.  It can also be called by the user.  */
80  void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
81
82  /// Takes a new handler function as an argument, returns the old function.
83  unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT;
84
85#if __cplusplus >= 201103L
86  /// Return the current unexpected handler.
87  unexpected_handler get_unexpected() noexcept;
88#endif
89
90  /** The runtime will call this function if an %exception is thrown which
91   *  violates the function's %exception specification.  */
92  void unexpected() __attribute__ ((__noreturn__));
93
94  /** [18.6.4]/1:  'Returns true after completing evaluation of a
95   *  throw-expression until either completing initialization of the
96   *  exception-declaration in the matching handler or entering @c unexpected()
97   *  due to the throw; or after entering @c terminate() for any reason
98   *  other than an explicit call to @c terminate().  [Note: This includes
99   *  stack unwinding [15.2].  end note]'
100   *
101   *  2: 'When @c uncaught_exception() is true, throwing an
102   *  %exception can result in a call of @c terminate()
103   *  (15.5.1).'
104   */
105  _GLIBCXX17_DEPRECATED
106  bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
107
108#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++98
109#define __cpp_lib_uncaught_exceptions 201411L
110  /// The number of uncaught exceptions.
111  int uncaught_exceptions() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
112#endif
113
114  /// @} group exceptions
115} // namespace std
116
117namespace __gnu_cxx
118{
119_GLIBCXX_BEGIN_NAMESPACE_VERSION
120
121  /**
122   *  @brief A replacement for the standard terminate_handler which
123   *  prints more information about the terminating exception (if any)
124   *  on stderr.
125   *
126   *  @ingroup exceptions
127   *
128   *  Call
129   *   @code
130   *     std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
131   *   @endcode
132   *  to use.  For more info, see
133   *  http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
134   *
135   *  In 3.4 and later, this is on by default.
136   */
137  void __verbose_terminate_handler();
138
139_GLIBCXX_END_NAMESPACE_VERSION
140} // namespace
141
142} // extern "C++"
143
144#pragma GCC visibility pop
145
146#if (__cplusplus >= 201103L)
147#include <bits/exception_ptr.h>
148#include <bits/nested_exception.h>
149#endif
150
151#endif
152