1 // -*- C++ -*- Implement the members of exception_ptr.
2 // Copyright (C) 2008, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 #include <bits/c++config.h>
27 #ifdef _GLIBCXX_ATOMIC_BUILTINS_4
29 #define _GLIBCXX_EH_PTR_COMPAT
32 #include <exception_ptr.h>
33 #include "unwind-cxx.h"
35 using namespace __cxxabiv1
;
37 std::__exception_ptr::exception_ptr::exception_ptr() throw()
38 : _M_exception_object(0) { }
41 std::__exception_ptr::exception_ptr::exception_ptr(void* obj
) throw()
42 : _M_exception_object(obj
) { _M_addref(); }
45 std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool
) throw()
46 : _M_exception_object(0) { }
49 std::__exception_ptr::
50 exception_ptr::exception_ptr(const exception_ptr
& other
) throw()
51 : _M_exception_object(other
._M_exception_object
)
55 std::__exception_ptr::exception_ptr::~exception_ptr() throw()
59 std::__exception_ptr::exception_ptr
&
60 std::__exception_ptr::
61 exception_ptr::operator=(const exception_ptr
& other
) throw()
63 exception_ptr(other
).swap(*this);
69 std::__exception_ptr::exception_ptr::_M_addref() throw()
71 if (_M_exception_object
)
73 __cxa_refcounted_exception
*eh
=
74 __get_refcounted_exception_header_from_obj (_M_exception_object
);
75 __sync_add_and_fetch (&eh
->referenceCount
, 1);
81 std::__exception_ptr::exception_ptr::_M_release() throw()
83 if (_M_exception_object
)
85 __cxa_refcounted_exception
*eh
=
86 __get_refcounted_exception_header_from_obj (_M_exception_object
);
87 if (__sync_sub_and_fetch (&eh
->referenceCount
, 1) == 0)
89 if (eh
->exc
.exceptionDestructor
)
90 eh
->exc
.exceptionDestructor (_M_exception_object
);
92 __cxa_free_exception (_M_exception_object
);
93 _M_exception_object
= 0;
100 std::__exception_ptr::exception_ptr::_M_get() const throw()
101 { return _M_exception_object
; }
105 std::__exception_ptr::exception_ptr::_M_safe_bool_dummy() throw () { }
109 std::__exception_ptr::exception_ptr::swap(exception_ptr
&other
) throw()
111 void *tmp
= _M_exception_object
;
112 _M_exception_object
= other
._M_exception_object
;
113 other
._M_exception_object
= tmp
;
117 // Retained for compatibility with CXXABI_1.3.
119 std::__exception_ptr::exception_ptr::operator!() const throw()
120 { return _M_exception_object
== 0; }
123 // Retained for compatibility with CXXABI_1.3.
124 std::__exception_ptr::exception_ptr::operator __safe_bool() const throw()
126 return _M_exception_object
? &exception_ptr::_M_safe_bool_dummy
: 0;
130 const std::type_info
*
131 std::__exception_ptr::exception_ptr::__cxa_exception_type() const throw()
133 __cxa_exception
*eh
= __get_exception_header_from_obj (_M_exception_object
);
134 return eh
->exceptionType
;
138 bool std::__exception_ptr::operator==(const exception_ptr
& lhs
,
139 const exception_ptr
& rhs
) throw()
140 { return lhs
._M_exception_object
== rhs
._M_exception_object
; }
143 bool std::__exception_ptr::operator!=(const exception_ptr
& lhs
,
144 const exception_ptr
& rhs
) throw()
145 { return !(lhs
== rhs
);}
149 std::current_exception() throw()
151 __cxa_eh_globals
*globals
= __cxa_get_globals ();
152 __cxa_exception
*header
= globals
->caughtExceptions
;
155 return std::exception_ptr();
157 // Since foreign exceptions can't be counted, we can't return them.
158 if (!__is_gxx_exception_class (header
->unwindHeader
.exception_class
))
159 return std::exception_ptr();
161 return std::exception_ptr(
162 __get_object_from_ambiguous_exception (header
));
167 __gxx_dependent_exception_cleanup(_Unwind_Reason_Code code
,
168 _Unwind_Exception
*exc
)
170 // This cleanup is set only for dependents.
171 __cxa_dependent_exception
*dep
= __get_dependent_exception_from_ue (exc
);
172 __cxa_refcounted_exception
*header
=
173 __get_refcounted_exception_header_from_obj (dep
->primaryException
);
175 // We only want to be called through _Unwind_DeleteException.
176 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
177 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
178 // like the GCC _Unwind_DeleteException function does.
179 if (code
!= _URC_FOREIGN_EXCEPTION_CAUGHT
&& code
!= _URC_NO_REASON
)
180 __terminate (header
->exc
.terminateHandler
);
182 __cxa_free_dependent_exception (dep
);
184 if (__sync_sub_and_fetch (&header
->referenceCount
, 1) == 0)
186 if (header
->exc
.exceptionDestructor
)
187 header
->exc
.exceptionDestructor (header
+ 1);
189 __cxa_free_exception (header
+ 1);
195 std::rethrow_exception(std::exception_ptr ep
)
197 void *obj
= ep
._M_get();
198 __cxa_refcounted_exception
*eh
199 = __get_refcounted_exception_header_from_obj (obj
);
201 __cxa_dependent_exception
*dep
= __cxa_allocate_dependent_exception ();
202 dep
->primaryException
= obj
;
203 __sync_add_and_fetch (&eh
->referenceCount
, 1);
205 dep
->unexpectedHandler
= __unexpected_handler
;
206 dep
->terminateHandler
= __terminate_handler
;
207 __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep
->unwindHeader
.exception_class
);
208 dep
->unwindHeader
.exception_cleanup
= __gxx_dependent_exception_cleanup
;
210 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
211 _Unwind_SjLj_RaiseException (&dep
->unwindHeader
);
213 _Unwind_RaiseException (&dep
->unwindHeader
);
216 // Some sort of unwinding error. Note that terminate is a handler.
217 __cxa_begin_catch (&dep
->unwindHeader
);
221 #undef _GLIBCXX_EH_PTR_COMPAT