1 // -*- C++ -*- Exception handling routines for throwing.
2 // Copyright (C) 2001-2013 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 "unwind-cxx.h"
28 using namespace __cxxabiv1;
32 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
34 // This cleanup is set only for primaries.
35 __cxa_refcounted_exception *header
36 = __get_refcounted_exception_header_from_ue (exc);
38 // We only want to be called through _Unwind_DeleteException.
39 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
40 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
41 // like the GCC _Unwind_DeleteException function does.
42 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
43 __terminate (header->exc.terminateHandler);
45 #if ATOMIC_INT_LOCK_FREE > 1
46 if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
49 if (header->exc.exceptionDestructor)
50 header->exc.exceptionDestructor (header + 1);
52 __cxa_free_exception (header + 1);
53 #if ATOMIC_INT_LOCK_FREE > 1
60 __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
61 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
63 PROBE2 (throw, obj, tinfo);
65 // Definitely a primary.
66 __cxa_refcounted_exception *header
67 = __get_refcounted_exception_header_from_obj (obj);
68 header->referenceCount = 1;
69 header->exc.exceptionType = tinfo;
70 header->exc.exceptionDestructor = dest;
71 header->exc.unexpectedHandler = __unexpected_handler;
72 header->exc.terminateHandler = __terminate_handler;
73 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class);
74 header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup;
76 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
77 _Unwind_SjLj_RaiseException (&header->exc.unwindHeader);
79 _Unwind_RaiseException (&header->exc.unwindHeader);
82 // Some sort of unwinding error. Note that terminate is a handler.
83 __cxa_begin_catch (&header->exc.unwindHeader);
88 __cxxabiv1::__cxa_rethrow ()
90 __cxa_eh_globals *globals = __cxa_get_globals ();
91 __cxa_exception *header = globals->caughtExceptions;
93 globals->uncaughtExceptions += 1;
95 // Watch for luser rethrowing with no active exception.
98 // Tell __cxa_end_catch this is a rethrow.
99 if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
100 globals->caughtExceptions = 0;
103 header->handlerCount = -header->handlerCount;
104 // Only notify probe for C++ exceptions.
105 PROBE2 (rethrow, __get_object_from_ambiguous_exception(header),
106 header->exceptionType);
109 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
110 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
112 #if defined(_LIBUNWIND_STD_ABI)
113 _Unwind_RaiseException (&header->unwindHeader);
115 _Unwind_Resume_or_Rethrow (&header->unwindHeader);
119 // Some sort of unwinding error. Note that terminate is a handler.
120 __cxa_begin_catch (&header->unwindHeader);