1 // -*- C++ -*- Exception handling routines for throwing.
2 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 // 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 2, 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 // You should have received a copy of the GNU General Public License
18 // along with GCC; see the file COPYING. If not, write to
19 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20 // Boston, MA 02110-1301, USA.
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
31 #include <bits/c++config.h>
32 #include "unwind-cxx.h"
34 using namespace __cxxabiv1;
38 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
40 // This cleanup is set only for primaries.
41 __cxa_refcounted_exception *header
42 = __get_refcounted_exception_header_from_ue (exc);
44 // We only want to be called through _Unwind_DeleteException.
45 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
46 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
47 // like the GCC _Unwind_DeleteException function does.
48 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
49 __terminate (header->exc.terminateHandler);
51 #ifdef _GLIBCXX_ATOMIC_BUILTINS_4
52 if (__sync_sub_and_fetch (&header->referenceCount, 1) == 0)
55 if (header->exc.exceptionDestructor)
56 header->exc.exceptionDestructor (header + 1);
58 __cxa_free_exception (header + 1);
59 #ifdef _GLIBCXX_ATOMIC_BUILTINS_4
66 __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
67 void (*dest) (void *))
69 // Definitely a primary.
70 __cxa_refcounted_exception *header
71 = __get_refcounted_exception_header_from_obj (obj);
72 header->referenceCount = 1;
73 header->exc.exceptionType = tinfo;
74 header->exc.exceptionDestructor = dest;
75 header->exc.unexpectedHandler = __unexpected_handler;
76 header->exc.terminateHandler = __terminate_handler;
77 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class);
78 header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup;
80 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
81 _Unwind_SjLj_RaiseException (&header->exc.unwindHeader);
83 _Unwind_RaiseException (&header->exc.unwindHeader);
86 // Some sort of unwinding error. Note that terminate is a handler.
87 __cxa_begin_catch (&header->exc.unwindHeader);
92 __cxxabiv1::__cxa_rethrow ()
94 __cxa_eh_globals *globals = __cxa_get_globals ();
95 __cxa_exception *header = globals->caughtExceptions;
97 globals->uncaughtExceptions += 1;
99 // Watch for luser rethrowing with no active exception.
102 // Tell __cxa_end_catch this is a rethrow.
103 if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
104 globals->caughtExceptions = 0;
106 header->handlerCount = -header->handlerCount;
108 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
109 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
111 #if defined(_LIBUNWIND_STD_ABI)
112 _Unwind_RaiseException (&header->unwindHeader);
114 _Unwind_Resume_or_Rethrow (&header->unwindHeader);
118 // Some sort of unwinding error. Note that terminate is a handler.
119 __cxa_begin_catch (&header->unwindHeader);