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52a11cbf | 1 | // -*- C++ -*- Exception handling routines for throwing. |
a945c346 | 2 | // Copyright (C) 2001-2024 Free Software Foundation, Inc. |
52a11cbf | 3 | // |
cbecceb9 | 4 | // This file is part of GCC. |
52a11cbf | 5 | // |
cbecceb9 | 6 | // GCC is free software; you can redistribute it and/or modify |
52a11cbf | 7 | // it under the terms of the GNU General Public License as published by |
748086b7 | 8 | // the Free Software Foundation; either version 3, or (at your option) |
52a11cbf RH |
9 | // any later version. |
10 | // | |
cbecceb9 | 11 | // GCC is distributed in the hope that it will be useful, |
52a11cbf RH |
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 | // | |
748086b7 JJ |
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. | |
52a11cbf | 19 | |
748086b7 JJ |
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/>. | |
52a11cbf | 24 | |
52a11cbf RH |
25 | #include <bits/c++config.h> |
26 | #include "unwind-cxx.h" | |
ed3cb497 | 27 | #include "eh_atomics.h" |
52a11cbf | 28 | |
52a11cbf RH |
29 | using namespace __cxxabiv1; |
30 | ||
31 | ||
32 | static void | |
33 | __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc) | |
34 | { | |
30a333ce | 35 | // This cleanup is set only for primaries. |
c4bca01b JJ |
36 | __cxa_refcounted_exception *header |
37 | = __get_refcounted_exception_header_from_ue (exc); | |
52a11cbf | 38 | |
30a333ce | 39 | // We only want to be called through _Unwind_DeleteException. |
cb94b155 | 40 | // _Unwind_DeleteException in the HP-UX IA64 libunwind library |
30a333ce | 41 | // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT |
cb94b155 SE |
42 | // like the GCC _Unwind_DeleteException function does. |
43 | if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON) | |
c4bca01b | 44 | __terminate (header->exc.terminateHandler); |
52a11cbf | 45 | |
ed3cb497 | 46 | if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount)) |
30a333ce | 47 | { |
c4bca01b JJ |
48 | if (header->exc.exceptionDestructor) |
49 | header->exc.exceptionDestructor (header + 1); | |
52a11cbf | 50 | |
30a333ce | 51 | __cxa_free_exception (header + 1); |
30a333ce | 52 | } |
52a11cbf RH |
53 | } |
54 | ||
27abac26 | 55 | extern "C" __cxa_refcounted_exception* |
0382bcfc JM |
56 | __cxxabiv1:: |
57 | __cxa_init_primary_exception(void *obj, std::type_info *tinfo, | |
58 | void (_GLIBCXX_CDTOR_CALLABI *dest) (void *)) | |
59 | _GLIBCXX_NOTHROW | |
27abac26 GN |
60 | { |
61 | __cxa_refcounted_exception *header | |
62 | = __get_refcounted_exception_header_from_obj (obj); | |
63 | header->referenceCount = 0; | |
64 | header->exc.exceptionType = tinfo; | |
65 | header->exc.exceptionDestructor = dest; | |
f4130a3e JW |
66 | #pragma GCC diagnostic push |
67 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" | |
27abac26 | 68 | header->exc.unexpectedHandler = std::get_unexpected (); |
f4130a3e | 69 | #pragma GCC diagnostic pop |
27abac26 GN |
70 | header->exc.terminateHandler = std::get_terminate (); |
71 | __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class); | |
72 | header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup; | |
73 | ||
74 | return header; | |
75 | } | |
52a11cbf RH |
76 | |
77 | extern "C" void | |
f5c48b80 | 78 | __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo, |
2ecb85c8 | 79 | void (_GLIBCXX_CDTOR_CALLABI *dest) (void *)) |
52a11cbf | 80 | { |
83c214a8 TT |
81 | PROBE2 (throw, obj, tinfo); |
82 | ||
ccc2e73c JM |
83 | __cxa_eh_globals *globals = __cxa_get_globals (); |
84 | globals->uncaughtExceptions += 1; | |
30a333ce | 85 | // Definitely a primary. |
27abac26 GN |
86 | __cxa_refcounted_exception *header = |
87 | __cxa_init_primary_exception(obj, tinfo, dest); | |
30a333ce | 88 | header->referenceCount = 1; |
52a11cbf | 89 | |
9b92a9f3 | 90 | #ifdef __USING_SJLJ_EXCEPTIONS__ |
c4bca01b | 91 | _Unwind_SjLj_RaiseException (&header->exc.unwindHeader); |
52a11cbf | 92 | #else |
c4bca01b | 93 | _Unwind_RaiseException (&header->exc.unwindHeader); |
52a11cbf RH |
94 | #endif |
95 | ||
96 | // Some sort of unwinding error. Note that terminate is a handler. | |
c4bca01b | 97 | __cxa_begin_catch (&header->exc.unwindHeader); |
52a11cbf RH |
98 | std::terminate (); |
99 | } | |
100 | ||
101 | extern "C" void | |
723acbd5 | 102 | __cxxabiv1::__cxa_rethrow () |
52a11cbf RH |
103 | { |
104 | __cxa_eh_globals *globals = __cxa_get_globals (); | |
105 | __cxa_exception *header = globals->caughtExceptions; | |
106 | ||
39609077 RH |
107 | globals->uncaughtExceptions += 1; |
108 | ||
52a11cbf RH |
109 | // Watch for luser rethrowing with no active exception. |
110 | if (header) | |
111 | { | |
112 | // Tell __cxa_end_catch this is a rethrow. | |
617a1b71 | 113 | if (!__is_gxx_exception_class(header->unwindHeader.exception_class)) |
a944ceb9 RH |
114 | globals->caughtExceptions = 0; |
115 | else | |
83c214a8 TT |
116 | { |
117 | header->handlerCount = -header->handlerCount; | |
118 | // Only notify probe for C++ exceptions. | |
119 | PROBE2 (rethrow, __get_object_from_ambiguous_exception(header), | |
120 | header->exceptionType); | |
121 | } | |
52a11cbf | 122 | |
9b92a9f3 | 123 | #ifdef __USING_SJLJ_EXCEPTIONS__ |
a944ceb9 | 124 | _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader); |
ed0d100f | 125 | #else |
1dcca6f3 | 126 | #if defined(_LIBUNWIND_STD_ABI) |
ed0d100f | 127 | _Unwind_RaiseException (&header->unwindHeader); |
52a11cbf | 128 | #else |
a944ceb9 | 129 | _Unwind_Resume_or_Rethrow (&header->unwindHeader); |
ed0d100f | 130 | #endif |
52a11cbf RH |
131 | #endif |
132 | ||
133 | // Some sort of unwinding error. Note that terminate is a handler. | |
134 | __cxa_begin_catch (&header->unwindHeader); | |
135 | } | |
136 | std::terminate (); | |
137 | } |