1 // -*- C++ -*- Implement the members of exception_ptr.
2 // Copyright (C) 2008-2013 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>
26 #include <bits/atomic_lockfree_defines.h>
28 #if ATOMIC_INT_LOCK_FREE > 1
30 #define _GLIBCXX_EH_PTR_COMPAT
33 #include <bits/exception_ptr.h>
34 #include "unwind-cxx.h"
36 using namespace __cxxabiv1
;
38 std::__exception_ptr::exception_ptr::exception_ptr() _GLIBCXX_USE_NOEXCEPT
39 : _M_exception_object(0) { }
42 std::__exception_ptr::exception_ptr::exception_ptr(void* obj
)
44 : _M_exception_object(obj
) { _M_addref(); }
47 std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool
)
49 : _M_exception_object(0) { }
52 std::__exception_ptr::
53 exception_ptr::exception_ptr(const exception_ptr
& other
) _GLIBCXX_USE_NOEXCEPT
54 : _M_exception_object(other
._M_exception_object
)
58 std::__exception_ptr::exception_ptr::~exception_ptr() _GLIBCXX_USE_NOEXCEPT
62 std::__exception_ptr::exception_ptr
&
63 std::__exception_ptr::
64 exception_ptr::operator=(const exception_ptr
& other
) _GLIBCXX_USE_NOEXCEPT
66 exception_ptr(other
).swap(*this);
72 std::__exception_ptr::exception_ptr::_M_addref() _GLIBCXX_USE_NOEXCEPT
74 if (_M_exception_object
)
76 __cxa_refcounted_exception
*eh
=
77 __get_refcounted_exception_header_from_obj (_M_exception_object
);
78 __atomic_add_fetch (&eh
->referenceCount
, 1, __ATOMIC_ACQ_REL
);
84 std::__exception_ptr::exception_ptr::_M_release() _GLIBCXX_USE_NOEXCEPT
86 if (_M_exception_object
)
88 __cxa_refcounted_exception
*eh
=
89 __get_refcounted_exception_header_from_obj (_M_exception_object
);
90 if (__atomic_sub_fetch (&eh
->referenceCount
, 1, __ATOMIC_ACQ_REL
) == 0)
92 if (eh
->exc
.exceptionDestructor
)
93 eh
->exc
.exceptionDestructor (_M_exception_object
);
95 __cxa_free_exception (_M_exception_object
);
96 _M_exception_object
= 0;
103 std::__exception_ptr::exception_ptr::_M_get() const _GLIBCXX_USE_NOEXCEPT
104 { return _M_exception_object
; }
108 std::__exception_ptr::exception_ptr::swap(exception_ptr
&other
)
109 _GLIBCXX_USE_NOEXCEPT
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::_M_safe_bool_dummy()
120 _GLIBCXX_USE_NOEXCEPT
{ }
123 // Retained for compatibility with CXXABI_1.3.
125 std::__exception_ptr::exception_ptr::operator!() const _GLIBCXX_USE_NOEXCEPT
126 { return _M_exception_object
== 0; }
129 // Retained for compatibility with CXXABI_1.3.
130 std::__exception_ptr::exception_ptr::operator __safe_bool() const
131 _GLIBCXX_USE_NOEXCEPT
133 return _M_exception_object
? &exception_ptr::_M_safe_bool_dummy
: 0;
137 const std::type_info
*
138 std::__exception_ptr::exception_ptr::__cxa_exception_type() const
139 _GLIBCXX_USE_NOEXCEPT
141 __cxa_exception
*eh
= __get_exception_header_from_obj (_M_exception_object
);
142 return eh
->exceptionType
;
146 bool std::__exception_ptr::operator==(const exception_ptr
& lhs
,
147 const exception_ptr
& rhs
)
148 _GLIBCXX_USE_NOEXCEPT
149 { return lhs
._M_exception_object
== rhs
._M_exception_object
; }
152 bool std::__exception_ptr::operator!=(const exception_ptr
& lhs
,
153 const exception_ptr
& rhs
)
154 _GLIBCXX_USE_NOEXCEPT
155 { return !(lhs
== rhs
);}
159 std::current_exception() _GLIBCXX_USE_NOEXCEPT
161 __cxa_eh_globals
*globals
= __cxa_get_globals ();
162 __cxa_exception
*header
= globals
->caughtExceptions
;
165 return std::exception_ptr();
167 // Since foreign exceptions can't be counted, we can't return them.
168 if (!__is_gxx_exception_class (header
->unwindHeader
.exception_class
))
169 return std::exception_ptr();
171 return std::exception_ptr(
172 __get_object_from_ambiguous_exception (header
));
177 __gxx_dependent_exception_cleanup(_Unwind_Reason_Code code
,
178 _Unwind_Exception
*exc
)
180 // This cleanup is set only for dependents.
181 __cxa_dependent_exception
*dep
= __get_dependent_exception_from_ue (exc
);
182 __cxa_refcounted_exception
*header
=
183 __get_refcounted_exception_header_from_obj (dep
->primaryException
);
185 // We only want to be called through _Unwind_DeleteException.
186 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
187 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
188 // like the GCC _Unwind_DeleteException function does.
189 if (code
!= _URC_FOREIGN_EXCEPTION_CAUGHT
&& code
!= _URC_NO_REASON
)
190 __terminate (header
->exc
.terminateHandler
);
192 __cxa_free_dependent_exception (dep
);
194 if (__atomic_sub_fetch (&header
->referenceCount
, 1, __ATOMIC_ACQ_REL
) == 0)
196 if (header
->exc
.exceptionDestructor
)
197 header
->exc
.exceptionDestructor (header
+ 1);
199 __cxa_free_exception (header
+ 1);
205 std::rethrow_exception(std::exception_ptr ep
)
207 void *obj
= ep
._M_get();
208 __cxa_refcounted_exception
*eh
209 = __get_refcounted_exception_header_from_obj (obj
);
211 __cxa_dependent_exception
*dep
= __cxa_allocate_dependent_exception ();
212 dep
->primaryException
= obj
;
213 __atomic_add_fetch (&eh
->referenceCount
, 1, __ATOMIC_ACQ_REL
);
215 dep
->unexpectedHandler
= get_unexpected ();
216 dep
->terminateHandler
= get_terminate ();
217 __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep
->unwindHeader
.exception_class
);
218 dep
->unwindHeader
.exception_cleanup
= __gxx_dependent_exception_cleanup
;
220 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
221 _Unwind_SjLj_RaiseException (&dep
->unwindHeader
);
223 _Unwind_RaiseException (&dep
->unwindHeader
);
226 // Some sort of unwinding error. Note that terminate is a handler.
227 __cxa_begin_catch (&dep
->unwindHeader
);
231 #undef _GLIBCXX_EH_PTR_COMPAT