1 // -*- C++ -*- Implement the members of exception_ptr.
2 // Copyright (C) 2008 Free Software Foundation, Inc.
4 // This file is part of GCC.
6 // GCC is free software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License as published by
8 // the Free Software Foundation; either version 2, or (at your option)
11 // GCC is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with GCC; see the file COPYING. If not, write to
18 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19 // Boston, MA 02110-1301, USA.
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
30 #include <bits/c++config.h>
32 #ifdef _GLIBCXX_ATOMIC_BUILTINS_4
35 #include <exception_ptr.h>
36 #include "unwind-cxx.h"
38 using namespace __cxxabiv1
;
40 std::__exception_ptr::exception_ptr::exception_ptr() throw()
41 : _M_exception_object(0)
46 std::__exception_ptr::exception_ptr::exception_ptr(void* obj
) throw()
47 : _M_exception_object(obj
)
53 std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool
) throw()
54 : _M_exception_object(0)
59 std::__exception_ptr::exception_ptr::exception_ptr(
60 const exception_ptr
& other
) throw()
61 : _M_exception_object(other
._M_exception_object
)
67 std::__exception_ptr::exception_ptr::~exception_ptr() throw()
73 std::__exception_ptr::exception_ptr
&
74 std::__exception_ptr::exception_ptr::operator=(
75 const exception_ptr
& other
) throw()
77 exception_ptr(other
).swap(*this);
83 std::__exception_ptr::exception_ptr::_M_addref() throw()
85 if (_M_exception_object
)
88 __get_exception_header_from_obj (_M_exception_object
);
89 __sync_add_and_fetch (&eh
->referenceCount
, 1);
95 std::__exception_ptr::exception_ptr::_M_release() throw()
97 if (_M_exception_object
)
100 __get_exception_header_from_obj (_M_exception_object
);
101 if (__sync_sub_and_fetch (&eh
->referenceCount
, 1) == 0)
103 if (eh
->exceptionDestructor
)
104 eh
->exceptionDestructor (_M_exception_object
);
106 __cxa_free_exception (_M_exception_object
);
107 _M_exception_object
= 0;
114 std::__exception_ptr::exception_ptr::_M_get() const throw()
116 return _M_exception_object
;
121 std::__exception_ptr::exception_ptr::_M_safe_bool_dummy()
127 std::__exception_ptr::exception_ptr::swap(exception_ptr
&other
) throw()
129 void *tmp
= _M_exception_object
;
130 _M_exception_object
= other
._M_exception_object
;
131 other
._M_exception_object
= tmp
;
136 std::__exception_ptr::exception_ptr::operator!() const throw()
138 return _M_exception_object
== 0;
142 std::__exception_ptr::exception_ptr::operator __safe_bool() const throw()
144 return _M_exception_object
? &exception_ptr::_M_safe_bool_dummy
: 0;
148 const std::type_info
*
149 std::__exception_ptr::exception_ptr::__cxa_exception_type() const throw()
151 __cxa_exception
*eh
= __get_exception_header_from_obj (_M_exception_object
);
152 return eh
->exceptionType
;
156 bool std::__exception_ptr::operator==(const exception_ptr
& lhs
,
157 const exception_ptr
& rhs
) throw()
159 return lhs
._M_exception_object
== rhs
._M_exception_object
;
163 bool std::__exception_ptr::operator!=(const exception_ptr
& lhs
,
164 const exception_ptr
& rhs
) throw()
166 return !(lhs
== rhs
);
171 std::current_exception() throw()
173 __cxa_eh_globals
*globals
= __cxa_get_globals ();
174 __cxa_exception
*header
= globals
->caughtExceptions
;
177 return std::exception_ptr();
179 // Since foreign exceptions can't be counted, we can't return them.
180 if (!__is_gxx_exception_class (header
->unwindHeader
.exception_class
))
181 return std::exception_ptr();
183 return std::exception_ptr(
184 __get_object_from_ambiguous_exception (header
));
189 __gxx_dependent_exception_cleanup (_Unwind_Reason_Code code
,
190 _Unwind_Exception
*exc
)
192 // This cleanup is set only for dependents.
193 __cxa_dependent_exception
*dep
= __get_dependent_exception_from_ue (exc
);
194 __cxa_exception
*header
=
195 __get_exception_header_from_obj (dep
->primaryException
);
197 // We only want to be called through _Unwind_DeleteException.
198 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
199 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
200 // like the GCC _Unwind_DeleteException function does.
201 if (code
!= _URC_FOREIGN_EXCEPTION_CAUGHT
&& code
!= _URC_NO_REASON
)
202 __terminate (header
->terminateHandler
);
204 __cxa_free_dependent_exception (dep
);
206 if (__sync_sub_and_fetch (&header
->referenceCount
, 1) == 0)
208 if (header
->exceptionDestructor
)
209 header
->exceptionDestructor (header
+ 1);
211 __cxa_free_exception (header
+ 1);
217 std::rethrow_exception(std::exception_ptr ep
)
219 void *obj
= ep
._M_get();
220 __cxa_exception
*eh
= __get_exception_header_from_obj (obj
);
222 __cxa_dependent_exception
*dep
= __cxa_allocate_dependent_exception ();
223 dep
->primaryException
= obj
;
224 __sync_add_and_fetch (&eh
->referenceCount
, 1);
226 dep
->unexpectedHandler
= __unexpected_handler
;
227 dep
->terminateHandler
= __terminate_handler
;
228 __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep
->unwindHeader
.exception_class
);
229 dep
->unwindHeader
.exception_cleanup
= __gxx_dependent_exception_cleanup
;
231 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
232 _Unwind_SjLj_RaiseException (&dep
->unwindHeader
);
234 _Unwind_RaiseException (&dep
->unwindHeader
);
237 // Some sort of unwinding error. Note that terminate is a handler.
238 __cxa_begin_catch (&dep
->unwindHeader
);