mirror of git://gcc.gnu.org/git/gcc.git
124 lines
4.0 KiB
C++
124 lines
4.0 KiB
C++
// -*- C++ -*- Exception handling routines for throwing.
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// Copyright (C) 2001-2013 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 "unwind-cxx.h"
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using namespace __cxxabiv1;
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static void
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__gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
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{
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// This cleanup is set only for primaries.
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__cxa_refcounted_exception *header
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= __get_refcounted_exception_header_from_ue (exc);
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// We only want to be called through _Unwind_DeleteException.
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// _Unwind_DeleteException in the HP-UX IA64 libunwind library
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// returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
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// like the GCC _Unwind_DeleteException function does.
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if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
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__terminate (header->exc.terminateHandler);
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#if ATOMIC_INT_LOCK_FREE > 1
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if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
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{
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#endif
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if (header->exc.exceptionDestructor)
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header->exc.exceptionDestructor (header + 1);
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__cxa_free_exception (header + 1);
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#if ATOMIC_INT_LOCK_FREE > 1
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}
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#endif
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}
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extern "C" void
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__cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
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void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
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{
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PROBE2 (throw, obj, tinfo);
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// Definitely a primary.
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__cxa_refcounted_exception *header
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= __get_refcounted_exception_header_from_obj (obj);
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header->referenceCount = 1;
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header->exc.exceptionType = tinfo;
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header->exc.exceptionDestructor = dest;
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header->exc.unexpectedHandler = std::get_unexpected ();
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header->exc.terminateHandler = std::get_terminate ();
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__GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class);
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header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup;
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#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
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_Unwind_SjLj_RaiseException (&header->exc.unwindHeader);
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#else
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_Unwind_RaiseException (&header->exc.unwindHeader);
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#endif
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// Some sort of unwinding error. Note that terminate is a handler.
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__cxa_begin_catch (&header->exc.unwindHeader);
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std::terminate ();
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}
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extern "C" void
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__cxxabiv1::__cxa_rethrow ()
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{
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__cxa_eh_globals *globals = __cxa_get_globals ();
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__cxa_exception *header = globals->caughtExceptions;
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globals->uncaughtExceptions += 1;
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// Watch for luser rethrowing with no active exception.
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if (header)
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{
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// Tell __cxa_end_catch this is a rethrow.
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if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
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globals->caughtExceptions = 0;
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else
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{
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header->handlerCount = -header->handlerCount;
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// Only notify probe for C++ exceptions.
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PROBE2 (rethrow, __get_object_from_ambiguous_exception(header),
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header->exceptionType);
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}
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#ifdef _GLIBCXX_SJLJ_EXCEPTIONS
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_Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
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#else
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#if defined(_LIBUNWIND_STD_ABI)
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_Unwind_RaiseException (&header->unwindHeader);
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#else
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_Unwind_Resume_or_Rethrow (&header->unwindHeader);
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#endif
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#endif
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// Some sort of unwinding error. Note that terminate is a handler.
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__cxa_begin_catch (&header->unwindHeader);
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}
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std::terminate ();
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}
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