1 // -*- C++ -*- Helpers for calling unextected and terminate
2 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 // Free Software Foundation, Inc.
6 // This file is part of GCC.
8 // GCC is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3, or (at your option)
13 // GCC is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // Under Section 7 of GPL version 3, you are granted additional
19 // permissions described in the GCC Runtime Library Exception, version
20 // 3.1, as published by the Free Software Foundation.
22 // You should have received a copy of the GNU General Public License and
23 // a copy of the GCC Runtime Library Exception along with this program;
24 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
25 // <http://www.gnu.org/licenses/>.
27 #include <bits/c++config.h>
29 #include <bits/exception_defines.h>
30 #include "unwind-cxx.h"
32 using namespace __cxxabiv1;
34 #include "unwind-pe.h"
37 // Helper routine for when the exception handling code needs to call
41 __cxa_call_terminate(_Unwind_Exception* ue_header) throw ()
46 // terminate is classed as a catch handler.
47 __cxa_begin_catch(ue_header);
49 // Call the terminate handler that was in effect when we threw this
51 if (__is_gxx_exception_class(ue_header->exception_class))
55 xh = __get_exception_header_from_ue(ue_header);
56 __terminate(xh->terminateHandler);
59 /* Call the global routine if we don't have anything better. */
64 #ifdef __ARM_EABI_UNWINDER__
65 // The ARM EABI __cxa_call_unexpected has the same semantics as the generic
66 // routine, but the exception specification has a different format.
68 __cxa_call_unexpected(void* exc_obj_in)
70 _Unwind_Exception* exc_obj
71 = reinterpret_cast<_Unwind_Exception*>(exc_obj_in);
74 _Unwind_Word rtti_stride = 0;
75 _Unwind_Word* rtti_list = NULL;
76 _Unwind_Ptr rtti_base = 0;
77 bool foreign_exception;
78 std::unexpected_handler unexpectedHandler = NULL;
79 std::terminate_handler terminateHandler = NULL;
81 if (__is_gxx_exception_class(exc_obj->exception_class))
83 // Save data from the EO, which may be clobbered by _cxa_begin_catch.
84 xh = __get_exception_header_from_ue(exc_obj);
85 unexpectedHandler = xh->unexpectedHandler;
86 terminateHandler = xh->terminateHandler;
87 rtti_count = exc_obj->barrier_cache.bitpattern[1];
88 rtti_base = (_Unwind_Ptr) exc_obj->barrier_cache.bitpattern[2];
89 rtti_stride = exc_obj->barrier_cache.bitpattern[3];
90 rtti_list = (_Unwind_Word*) exc_obj->barrier_cache.bitpattern[4];
91 foreign_exception = false;
94 foreign_exception = true;
96 /* This must be called after extracting data from the EO, but before
97 calling unexpected(). */
98 __cxa_begin_catch(exc_obj);
100 // This function is a handler for our exception argument. If we exit
101 // by throwing a different exception, we'll need the original cleaned up.
102 struct end_catch_protect
104 end_catch_protect() { }
105 ~end_catch_protect() { __cxa_end_catch(); }
106 } end_catch_protect_obj;
111 if (foreign_exception)
114 __unexpected(unexpectedHandler);
118 /* See if the new exception matches the rtti list. */
119 if (foreign_exception)
122 // Get the exception thrown from unexpected.
124 __cxa_eh_globals* globals = __cxa_get_globals_fast();
125 __cxa_exception* new_xh = globals->caughtExceptions;
126 void* new_ptr = __get_object_from_ambiguous_exception (new_xh);
127 const std::type_info* catch_type;
129 bool bad_exception_allowed = false;
130 const std::type_info& bad_exc = typeid(std::bad_exception);
132 // Check the new exception against the rtti list
133 for (n = 0; n < rtti_count; n++)
137 offset = (_Unwind_Word) &rtti_list[n * (rtti_stride >> 2)];
138 offset = _Unwind_decode_typeinfo_ptr(rtti_base, offset);
139 catch_type = (const std::type_info*) (offset);
141 if (__cxa_type_match(&new_xh->unwindHeader, catch_type, false,
142 &new_ptr) != ctm_failed)
143 __throw_exception_again;
145 if (catch_type->__do_catch(&bad_exc, 0, 1))
146 bad_exception_allowed = true;
149 // If the exception spec allows std::bad_exception, throw that.
151 if (bad_exception_allowed)
152 throw std::bad_exception();
156 __terminate(terminateHandler);
159 #endif // __ARM_EABI_UNWINDER__