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1 : // Exception Handling support header for -*- C++ -*-
2 :
3 : // Copyright (C) 1995-2016 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 0 : exception() _GLIBCXX_USE_NOEXCEPT { }
64 : virtual ~exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
65 :
66 : /** Returns a C-style character string describing the general cause
67 : * of the current error. */
68 : virtual const char*
69 : what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
70 : };
71 :
72 : /** If an %exception is thrown which is not listed in a function's
73 : * %exception specification, one of these may be thrown. */
74 : class bad_exception : public exception
75 : {
76 : public:
77 : bad_exception() _GLIBCXX_USE_NOEXCEPT { }
78 :
79 : // This declaration is not useless:
80 : // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
81 : virtual ~bad_exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
82 :
83 : // See comment in eh_exception.cc.
84 : virtual const char*
85 : what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT;
86 : };
87 :
88 : /// If you write a replacement %terminate handler, it must be of this type.
89 : typedef void (*terminate_handler) ();
90 :
91 : /// If you write a replacement %unexpected handler, it must be of this type.
92 : typedef void (*unexpected_handler) ();
93 :
94 : /// Takes a new handler function as an argument, returns the old function.
95 : terminate_handler set_terminate(terminate_handler) _GLIBCXX_USE_NOEXCEPT;
96 :
97 : #if __cplusplus >= 201103L
98 : /// Return the current terminate handler.
99 : terminate_handler get_terminate() noexcept;
100 : #endif
101 :
102 : /** The runtime will call this function if %exception handling must be
103 : * abandoned for any reason. It can also be called by the user. */
104 : void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
105 :
106 : /// Takes a new handler function as an argument, returns the old function.
107 : unexpected_handler set_unexpected(unexpected_handler) _GLIBCXX_USE_NOEXCEPT;
108 :
109 : #if __cplusplus >= 201103L
110 : /// Return the current unexpected handler.
111 : unexpected_handler get_unexpected() noexcept;
112 : #endif
113 :
114 : /** The runtime will call this function if an %exception is thrown which
115 : * violates the function's %exception specification. */
116 : void unexpected() __attribute__ ((__noreturn__));
117 :
118 : /** [18.6.4]/1: 'Returns true after completing evaluation of a
119 : * throw-expression until either completing initialization of the
120 : * exception-declaration in the matching handler or entering @c unexpected()
121 : * due to the throw; or after entering @c terminate() for any reason
122 : * other than an explicit call to @c terminate(). [Note: This includes
123 : * stack unwinding [15.2]. end note]'
124 : *
125 : * 2: 'When @c uncaught_exception() is true, throwing an
126 : * %exception can result in a call of @c terminate()
127 : * (15.5.1).'
128 : */
129 : bool uncaught_exception() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
130 :
131 : #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++98
132 : #define __cpp_lib_uncaught_exceptions 201411
133 : /// The number of uncaught exceptions.
134 : int uncaught_exceptions() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));
135 : #endif
136 :
137 : // @} group exceptions
138 : } // namespace std
139 :
140 : namespace __gnu_cxx
141 : {
142 : _GLIBCXX_BEGIN_NAMESPACE_VERSION
143 :
144 : /**
145 : * @brief A replacement for the standard terminate_handler which
146 : * prints more information about the terminating exception (if any)
147 : * on stderr.
148 : *
149 : * @ingroup exceptions
150 : *
151 : * Call
152 : * @code
153 : * std::set_terminate(__gnu_cxx::__verbose_terminate_handler)
154 : * @endcode
155 : * to use. For more info, see
156 : * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt02ch06s02.html
157 : *
158 : * In 3.4 and later, this is on by default.
159 : */
160 : void __verbose_terminate_handler();
161 :
162 : _GLIBCXX_END_NAMESPACE_VERSION
163 : } // namespace
164 :
165 : } // extern "C++"
166 :
167 : #pragma GCC visibility pop
168 :
169 : #if (__cplusplus >= 201103L) && (ATOMIC_INT_LOCK_FREE > 1)
170 : #include <bits/exception_ptr.h>
171 : #include <bits/nested_exception.h>
172 : #endif
173 :
174 : #endif
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