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6305f20a | 1 | // Exception Handling support header for -*- C++ -*- |
d34786e3 | 2 | |
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3 | // Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, |
4 | // 2004, 2005, 2006, 2007 | |
d66ae36a | 5 | // Free Software Foundation |
e2c09482 | 6 | // |
cbecceb9 | 7 | // This file is part of GCC. |
6305f20a | 8 | // |
cbecceb9 | 9 | // GCC is free software; you can redistribute it and/or modify |
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10 | // it under the terms of the GNU General Public License as published by |
11 | // the Free Software Foundation; either version 2, or (at your option) | |
12 | // any later version. | |
13 | // | |
cbecceb9 | 14 | // GCC is distributed in the hope that it will be useful, |
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15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | // GNU General Public License for more details. | |
18 | // | |
19 | // You should have received a copy of the GNU General Public License | |
cbecceb9 | 20 | // along with GCC; see the file COPYING. If not, write to |
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21 | // the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
22 | // Boston, MA 02110-1301, USA. | |
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23 | |
24 | // As a special exception, you may use this file as part of a free software | |
25 | // library without restriction. Specifically, if other files instantiate | |
26 | // templates or use macros or inline functions from this file, or you compile | |
27 | // this file and link it with other files to produce an executable, this | |
28 | // file does not by itself cause the resulting executable to be covered by | |
29 | // the GNU General Public License. This exception does not however | |
30 | // invalidate any other reasons why the executable file might be covered by | |
31 | // the GNU General Public License. | |
32 | ||
669f7a03 | 33 | /** @file exception |
78a53887 | 34 | * This is a Standard C++ Library header. |
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35 | */ |
36 | ||
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37 | #ifndef __EXCEPTION__ |
38 | #define __EXCEPTION__ | |
39 | ||
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40 | #pragma GCC visibility push(default) |
41 | ||
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42 | #include <bits/c++config.h> |
43 | ||
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44 | extern "C++" { |
45 | ||
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46 | namespace std |
47 | { | |
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48 | /** |
49 | * @brief Base class for all library exceptions. | |
50 | * | |
51 | * This is the base class for all exceptions thrown by the standard | |
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52 | * library, and by certain language expressions. You are free to derive |
53 | * your own %exception classes, or use a different hierarchy, or to | |
54 | * throw non-class data (e.g., fundamental types). | |
669f7a03 | 55 | */ |
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56 | class exception |
57 | { | |
58 | public: | |
59 | exception() throw() { } | |
f68147f7 | 60 | virtual ~exception() throw(); |
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61 | /** Returns a C-style character string describing the general cause |
62 | * of the current error. */ | |
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63 | virtual const char* what() const throw(); |
64 | }; | |
6305f20a | 65 | |
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66 | /** If an %exception is thrown which is not listed in a function's |
67 | * %exception specification, one of these may be thrown. */ | |
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68 | class bad_exception : public exception |
69 | { | |
70 | public: | |
71 | bad_exception() throw() { } | |
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72 | // This declaration is not useless: |
73 | // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 | |
d66ae36a | 74 | virtual ~bad_exception() throw(); |
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75 | // See comment in eh_exception.cc. |
76 | virtual const char* what() const throw(); | |
d34786e3 | 77 | }; |
6305f20a | 78 | |
669f7a03 | 79 | /// If you write a replacement %terminate handler, it must be of this type. |
d34786e3 | 80 | typedef void (*terminate_handler) (); |
669f7a03 | 81 | /// If you write a replacement %unexpected handler, it must be of this type. |
d34786e3 | 82 | typedef void (*unexpected_handler) (); |
6305f20a | 83 | |
669f7a03 | 84 | /// Takes a new handler function as an argument, returns the old function. |
d34786e3 | 85 | terminate_handler set_terminate(terminate_handler) throw(); |
669f7a03 | 86 | /** The runtime will call this function if %exception handling must be |
bad38757 | 87 | * abandoned for any reason. It can also be called by the user. */ |
d34786e3 | 88 | void terminate() __attribute__ ((__noreturn__)); |
6305f20a | 89 | |
669f7a03 | 90 | /// Takes a new handler function as an argument, returns the old function. |
d34786e3 | 91 | unexpected_handler set_unexpected(unexpected_handler) throw(); |
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92 | /** The runtime will call this function if an %exception is thrown which |
93 | * violates the function's %exception specification. */ | |
d34786e3 | 94 | void unexpected() __attribute__ ((__noreturn__)); |
6305f20a | 95 | |
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96 | /** [18.6.4]/1: "Returns true after completing evaluation of a |
97 | * throw-expression until either completing initialization of the | |
98 | * exception-declaration in the matching handler or entering @c unexpected() | |
99 | * due to the throw; or after entering @c terminate() for any reason | |
100 | * other than an explicit call to @c terminate(). [Note: This includes | |
101 | * stack unwinding [15.2]. end note]" | |
102 | * | |
103 | * 2: "When @c uncaught_exception() is true, throwing an %exception can | |
104 | * result in a call of @c terminate() (15.5.1)." | |
105 | */ | |
d34786e3 | 106 | bool uncaught_exception() throw(); |
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107 | } // namespace std |
108 | ||
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109 | _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
110 | ||
74a3070f | 111 | /** A replacement for the standard terminate_handler which prints more |
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112 | information about the terminating exception (if any) on stderr. Call |
113 | @code | |
afb0141f | 114 | std::set_terminate (__gnu_cxx::__verbose_terminate_handler) |
ffe94f83 | 115 | @endcode |
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116 | to use. For more info, see |
117 | http://gcc.gnu.org/onlinedocs/libstdc++/19_diagnostics/howto.html#4 | |
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118 | |
119 | In 3.4 and later, this is on by default. | |
efe44c60 | 120 | */ |
afb0141f | 121 | void __verbose_terminate_handler (); |
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122 | |
123 | _GLIBCXX_END_NAMESPACE | |
74a3070f | 124 | |
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125 | } // extern "C++" |
126 | ||
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127 | #pragma GCC visibility pop |
128 | ||
6305f20a | 129 | #endif |