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2a75c0b6 | 1 | // -*- C++ -*- Helpers for calling unextected and terminate |
aa118a03 | 2 | // Copyright (C) 2001-2014 Free Software Foundation, Inc. |
2a75c0b6 PB |
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 | |
748086b7 | 8 | // the Free Software Foundation; either version 3, or (at your option) |
2a75c0b6 PB |
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 | // | |
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. | |
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/>. | |
2a75c0b6 | 24 | |
2a75c0b6 PB |
25 | #include <bits/c++config.h> |
26 | #include <cstdlib> | |
7c3e9502 | 27 | #include <bits/exception_defines.h> |
2a75c0b6 PB |
28 | #include "unwind-cxx.h" |
29 | ||
30 | using namespace __cxxabiv1; | |
31 | ||
32 | #include "unwind-pe.h" | |
33 | ||
34 | ||
35 | // Helper routine for when the exception handling code needs to call | |
36 | // terminate. | |
37 | ||
38 | extern "C" void | |
b91cc3b9 | 39 | __cxa_call_terminate(_Unwind_Exception* ue_header) throw () |
2a75c0b6 PB |
40 | { |
41 | ||
42 | if (ue_header) | |
43 | { | |
44 | // terminate is classed as a catch handler. | |
45 | __cxa_begin_catch(ue_header); | |
46 | ||
47 | // Call the terminate handler that was in effect when we threw this | |
48 | // exception. */ | |
49 | if (__is_gxx_exception_class(ue_header->exception_class)) | |
50 | { | |
51 | __cxa_exception* xh; | |
52 | ||
53 | xh = __get_exception_header_from_ue(ue_header); | |
54 | __terminate(xh->terminateHandler); | |
55 | } | |
56 | } | |
57 | /* Call the global routine if we don't have anything better. */ | |
58 | std::terminate(); | |
59 | } | |
60 | ||
61 | ||
62 | #ifdef __ARM_EABI_UNWINDER__ | |
63 | // The ARM EABI __cxa_call_unexpected has the same semantics as the generic | |
64 | // routine, but the exception specification has a different format. | |
65 | extern "C" void | |
66 | __cxa_call_unexpected(void* exc_obj_in) | |
67 | { | |
68 | _Unwind_Exception* exc_obj | |
69 | = reinterpret_cast<_Unwind_Exception*>(exc_obj_in); | |
70 | ||
71 | int rtti_count = 0; | |
72 | _Unwind_Word rtti_stride = 0; | |
73 | _Unwind_Word* rtti_list = NULL; | |
1e874273 | 74 | _Unwind_Ptr rtti_base = 0; |
2a75c0b6 PB |
75 | bool foreign_exception; |
76 | std::unexpected_handler unexpectedHandler = NULL; | |
77 | std::terminate_handler terminateHandler = NULL; | |
78 | __cxa_exception* xh; | |
79 | if (__is_gxx_exception_class(exc_obj->exception_class)) | |
80 | { | |
81 | // Save data from the EO, which may be clobbered by _cxa_begin_catch. | |
82 | xh = __get_exception_header_from_ue(exc_obj); | |
83 | unexpectedHandler = xh->unexpectedHandler; | |
84 | terminateHandler = xh->terminateHandler; | |
85 | rtti_count = exc_obj->barrier_cache.bitpattern[1]; | |
1e874273 | 86 | rtti_base = (_Unwind_Ptr) exc_obj->barrier_cache.bitpattern[2]; |
2a75c0b6 PB |
87 | rtti_stride = exc_obj->barrier_cache.bitpattern[3]; |
88 | rtti_list = (_Unwind_Word*) exc_obj->barrier_cache.bitpattern[4]; | |
89 | foreign_exception = false; | |
90 | } | |
91 | else | |
92 | foreign_exception = true; | |
93 | ||
94 | /* This must be called after extracting data from the EO, but before | |
95 | calling unexpected(). */ | |
96 | __cxa_begin_catch(exc_obj); | |
97 | ||
98 | // This function is a handler for our exception argument. If we exit | |
99 | // by throwing a different exception, we'll need the original cleaned up. | |
100 | struct end_catch_protect | |
101 | { | |
102 | end_catch_protect() { } | |
103 | ~end_catch_protect() { __cxa_end_catch(); } | |
104 | } end_catch_protect_obj; | |
105 | ||
106 | ||
90021b55 RM |
107 | __try |
108 | { | |
2a75c0b6 PB |
109 | if (foreign_exception) |
110 | std::unexpected(); | |
111 | else | |
112 | __unexpected(unexpectedHandler); | |
113 | } | |
90021b55 | 114 | __catch(...) |
2a75c0b6 PB |
115 | { |
116 | /* See if the new exception matches the rtti list. */ | |
117 | if (foreign_exception) | |
118 | std::terminate(); | |
119 | ||
120 | // Get the exception thrown from unexpected. | |
121 | ||
122 | __cxa_eh_globals* globals = __cxa_get_globals_fast(); | |
123 | __cxa_exception* new_xh = globals->caughtExceptions; | |
c5e46192 | 124 | void* new_ptr = __get_object_from_ambiguous_exception (new_xh); |
2a75c0b6 PB |
125 | const std::type_info* catch_type; |
126 | int n; | |
127 | bool bad_exception_allowed = false; | |
128 | const std::type_info& bad_exc = typeid(std::bad_exception); | |
129 | ||
130 | // Check the new exception against the rtti list | |
131 | for (n = 0; n < rtti_count; n++) | |
132 | { | |
133 | _Unwind_Word offset; | |
134 | ||
135 | offset = (_Unwind_Word) &rtti_list[n * (rtti_stride >> 2)]; | |
1e874273 | 136 | offset = _Unwind_decode_typeinfo_ptr(rtti_base, offset); |
2a75c0b6 PB |
137 | catch_type = (const std::type_info*) (offset); |
138 | ||
139 | if (__cxa_type_match(&new_xh->unwindHeader, catch_type, false, | |
140 | &new_ptr) != ctm_failed) | |
141 | __throw_exception_again; | |
142 | ||
90021b55 RM |
143 | // If the exception spec allows std::bad_exception, throw that. |
144 | // We don't have a thrown object to compare against, but since | |
145 | // bad_exception doesn't have virtual bases, that's OK; just pass NULL. | |
146 | void* obj = NULL; | |
147 | if (catch_type->__do_catch(&bad_exc, &obj, 1)) | |
2a75c0b6 PB |
148 | bad_exception_allowed = true; |
149 | } | |
150 | ||
151 | // If the exception spec allows std::bad_exception, throw that. | |
90021b55 | 152 | #ifdef __EXCEPTIONS |
2a75c0b6 PB |
153 | if (bad_exception_allowed) |
154 | throw std::bad_exception(); | |
90021b55 | 155 | #endif |
2a75c0b6 PB |
156 | |
157 | // Otherwise, die. | |
158 | __terminate(terminateHandler); | |
159 | } | |
160 | } | |
161 | #endif // __ARM_EABI_UNWINDER__ |