1 // -*- C++ -*- Exception handling routines for throwing.
2 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 // 2011, 2012 Free Software Foundation, Inc.
5 // This file is part of GCC.
7 // GCC is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 3, or (at your option)
12 // GCC is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // Under Section 7 of GPL version 3, you are granted additional
18 // permissions described in the GCC Runtime Library Exception, version
19 // 3.1, as published by the Free Software Foundation.
21 // You should have received a copy of the GNU General Public License and
22 // a copy of the GCC Runtime Library Exception along with this program;
23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24 // <http://www.gnu.org/licenses/>.
26 #include <bits/c++config.h>
27 #include "unwind-cxx.h"
29 using namespace __cxxabiv1;
33 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
35 // This cleanup is set only for primaries.
36 __cxa_refcounted_exception *header
37 = __get_refcounted_exception_header_from_ue (exc);
39 // We only want to be called through _Unwind_DeleteException.
40 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
41 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
42 // like the GCC _Unwind_DeleteException function does.
43 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
44 __terminate (header->exc.terminateHandler);
46 #if ATOMIC_INT_LOCK_FREE > 1
47 if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
50 if (header->exc.exceptionDestructor)
51 header->exc.exceptionDestructor (header + 1);
53 __cxa_free_exception (header + 1);
54 #if ATOMIC_INT_LOCK_FREE > 1
61 __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
62 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
64 __cxa_eh_globals *globals = __cxa_get_globals ();
65 globals->uncaughtExceptions += 1;
67 // Definitely a primary.
68 __cxa_refcounted_exception *header
69 = __get_refcounted_exception_header_from_obj (obj);
70 header->referenceCount = 1;
71 header->exc.exceptionType = tinfo;
72 header->exc.exceptionDestructor = dest;
73 header->exc.unexpectedHandler = __unexpected_handler;
74 header->exc.terminateHandler = __terminate_handler;
75 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class);
76 header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup;
78 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
79 _Unwind_SjLj_RaiseException (&header->exc.unwindHeader);
81 _Unwind_RaiseException (&header->exc.unwindHeader);
84 // Some sort of unwinding error. Note that terminate is a handler.
85 __cxa_begin_catch (&header->exc.unwindHeader);
90 __cxxabiv1::__cxa_rethrow ()
92 __cxa_eh_globals *globals = __cxa_get_globals ();
93 __cxa_exception *header = globals->caughtExceptions;
95 globals->uncaughtExceptions += 1;
97 // Watch for luser rethrowing with no active exception.
100 // Tell __cxa_end_catch this is a rethrow.
101 if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
102 globals->caughtExceptions = 0;
104 header->handlerCount = -header->handlerCount;
106 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
107 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
109 #if defined(_LIBUNWIND_STD_ABI)
110 _Unwind_RaiseException (&header->unwindHeader);
112 _Unwind_Resume_or_Rethrow (&header->unwindHeader);
116 // Some sort of unwinding error. Note that terminate is a handler.
117 __cxa_begin_catch (&header->unwindHeader);