forked from KolibriOS/kolibrios
160 lines
4.9 KiB
C++
160 lines
4.9 KiB
C++
// -*- C++ -*- Helpers for calling unextected and terminate
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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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// 2011
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// Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <bits/c++config.h>
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#include <cstdlib>
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#include <bits/exception_defines.h>
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#include "unwind-cxx.h"
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using namespace __cxxabiv1;
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#include "unwind-pe.h"
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// Helper routine for when the exception handling code needs to call
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// terminate.
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extern "C" void
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__cxa_call_terminate(_Unwind_Exception* ue_header) throw ()
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{
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if (ue_header)
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{
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// terminate is classed as a catch handler.
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__cxa_begin_catch(ue_header);
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// Call the terminate handler that was in effect when we threw this
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// exception. */
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if (__is_gxx_exception_class(ue_header->exception_class))
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{
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__cxa_exception* xh;
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xh = __get_exception_header_from_ue(ue_header);
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__terminate(xh->terminateHandler);
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}
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}
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/* Call the global routine if we don't have anything better. */
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std::terminate();
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}
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#ifdef __ARM_EABI_UNWINDER__
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// The ARM EABI __cxa_call_unexpected has the same semantics as the generic
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// routine, but the exception specification has a different format.
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extern "C" void
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__cxa_call_unexpected(void* exc_obj_in)
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{
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_Unwind_Exception* exc_obj
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= reinterpret_cast<_Unwind_Exception*>(exc_obj_in);
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int rtti_count = 0;
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_Unwind_Word rtti_stride = 0;
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_Unwind_Word* rtti_list = NULL;
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_Unwind_Ptr rtti_base = 0;
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bool foreign_exception;
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std::unexpected_handler unexpectedHandler = NULL;
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std::terminate_handler terminateHandler = NULL;
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__cxa_exception* xh;
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if (__is_gxx_exception_class(exc_obj->exception_class))
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{
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// Save data from the EO, which may be clobbered by _cxa_begin_catch.
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xh = __get_exception_header_from_ue(exc_obj);
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unexpectedHandler = xh->unexpectedHandler;
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terminateHandler = xh->terminateHandler;
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rtti_count = exc_obj->barrier_cache.bitpattern[1];
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rtti_base = (_Unwind_Ptr) exc_obj->barrier_cache.bitpattern[2];
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rtti_stride = exc_obj->barrier_cache.bitpattern[3];
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rtti_list = (_Unwind_Word*) exc_obj->barrier_cache.bitpattern[4];
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foreign_exception = false;
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}
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else
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foreign_exception = true;
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/* This must be called after extracting data from the EO, but before
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calling unexpected(). */
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__cxa_begin_catch(exc_obj);
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// This function is a handler for our exception argument. If we exit
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// by throwing a different exception, we'll need the original cleaned up.
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struct end_catch_protect
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{
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end_catch_protect() { }
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~end_catch_protect() { __cxa_end_catch(); }
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} end_catch_protect_obj;
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__try
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{
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if (foreign_exception)
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std::unexpected();
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else
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__unexpected(unexpectedHandler);
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}
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__catch(...)
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{
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/* See if the new exception matches the rtti list. */
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if (foreign_exception)
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std::terminate();
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// Get the exception thrown from unexpected.
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__cxa_eh_globals* globals = __cxa_get_globals_fast();
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__cxa_exception* new_xh = globals->caughtExceptions;
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void* new_ptr = __get_object_from_ambiguous_exception (new_xh);
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const std::type_info* catch_type;
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int n;
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bool bad_exception_allowed = false;
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const std::type_info& bad_exc = typeid(std::bad_exception);
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// Check the new exception against the rtti list
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for (n = 0; n < rtti_count; n++)
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{
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_Unwind_Word offset;
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offset = (_Unwind_Word) &rtti_list[n * (rtti_stride >> 2)];
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offset = _Unwind_decode_typeinfo_ptr(rtti_base, offset);
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catch_type = (const std::type_info*) (offset);
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if (__cxa_type_match(&new_xh->unwindHeader, catch_type, false,
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&new_ptr) != ctm_failed)
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__throw_exception_again;
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if (catch_type->__do_catch(&bad_exc, 0, 1))
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bad_exception_allowed = true;
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}
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// If the exception spec allows std::bad_exception, throw that.
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#ifdef __EXCEPTIONS
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if (bad_exception_allowed)
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throw std::bad_exception();
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#endif
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// Otherwise, die.
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__terminate(terminateHandler);
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}
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}
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#endif // __ARM_EABI_UNWINDER__
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