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comparison libstdc++-v3/libsupc++/eh_throw.cc @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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68:561a7518be6b 111:04ced10e8804
1 // -*- C++ -*- Exception handling routines for throwing.
2 // Copyright (C) 2001-2017 Free Software Foundation, Inc.
3 //
4 // This file is part of GCC.
5 //
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)
9 // any later version.
10 //
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.
15 //
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.
19
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/>.
24
25 #include <bits/c++config.h>
26 #include "unwind-cxx.h"
27 #include "eh_atomics.h"
28
29 using namespace __cxxabiv1;
30
31
32 static void
33 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
34 {
35 // This cleanup is set only for primaries.
36 __cxa_refcounted_exception *header
37 = __get_refcounted_exception_header_from_ue (exc);
38
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);
45
46 if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount))
47 {
48 if (header->exc.exceptionDestructor)
49 header->exc.exceptionDestructor (header + 1);
50
51 __cxa_free_exception (header + 1);
52 }
53 }
54
55 extern "C" __cxa_refcounted_exception*
56 __cxxabiv1::__cxa_init_primary_exception(void *obj, std::type_info *tinfo,
57 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
58 {
59 __cxa_refcounted_exception *header
60 = __get_refcounted_exception_header_from_obj (obj);
61 header->referenceCount = 0;
62 header->exc.exceptionType = tinfo;
63 header->exc.exceptionDestructor = dest;
64 header->exc.unexpectedHandler = std::get_unexpected ();
65 header->exc.terminateHandler = std::get_terminate ();
66 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class);
67 header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup;
68
69 return header;
70 }
71
72 extern "C" void
73 __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
74 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
75 {
76 PROBE2 (throw, obj, tinfo);
77
78 __cxa_eh_globals *globals = __cxa_get_globals ();
79 globals->uncaughtExceptions += 1;
80 // Definitely a primary.
81 __cxa_refcounted_exception *header =
82 __cxa_init_primary_exception(obj, tinfo, dest);
83 header->referenceCount = 1;
84
85 #ifdef __USING_SJLJ_EXCEPTIONS__
86 _Unwind_SjLj_RaiseException (&header->exc.unwindHeader);
87 #else
88 _Unwind_RaiseException (&header->exc.unwindHeader);
89 #endif
90
91 // Some sort of unwinding error. Note that terminate is a handler.
92 __cxa_begin_catch (&header->exc.unwindHeader);
93 std::terminate ();
94 }
95
96 extern "C" void
97 __cxxabiv1::__cxa_rethrow ()
98 {
99 __cxa_eh_globals *globals = __cxa_get_globals ();
100 __cxa_exception *header = globals->caughtExceptions;
101
102 globals->uncaughtExceptions += 1;
103
104 // Watch for luser rethrowing with no active exception.
105 if (header)
106 {
107 // Tell __cxa_end_catch this is a rethrow.
108 if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
109 globals->caughtExceptions = 0;
110 else
111 {
112 header->handlerCount = -header->handlerCount;
113 // Only notify probe for C++ exceptions.
114 PROBE2 (rethrow, __get_object_from_ambiguous_exception(header),
115 header->exceptionType);
116 }
117
118 #ifdef __USING_SJLJ_EXCEPTIONS__
119 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
120 #else
121 #if defined(_LIBUNWIND_STD_ABI)
122 _Unwind_RaiseException (&header->unwindHeader);
123 #else
124 _Unwind_Resume_or_Rethrow (&header->unwindHeader);
125 #endif
126 #endif
127
128 // Some sort of unwinding error. Note that terminate is a handler.
129 __cxa_begin_catch (&header->unwindHeader);
130 }
131 std::terminate ();
132 }