127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
// -*- C++ -*- Exception handling routines for Transactional Memory.
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// Copyright (C) 2009-2017 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 <cstdlib>
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#include "unwind-cxx.h"
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using namespace __cxxabiv1;
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// Free one C++ exception.
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static void
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free_any_cxa_exception (_Unwind_Exception *eo)
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{
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__cxa_refcounted_exception *h
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= __get_refcounted_exception_header_from_ue (eo);
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if (__is_dependent_exception (eo->exception_class))
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{
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__cxa_dependent_exception *dep
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= __get_dependent_exception_from_ue (eo);
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h = __get_refcounted_exception_header_from_obj (dep->primaryException);
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__cxa_free_dependent_exception (dep);
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}
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#if __GCC_ATOMIC_INT_LOCK_FREE > 1
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if (__atomic_sub_fetch (&h->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
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#endif
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__cxa_free_exception (h + 1);
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}
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// Cleanup exception handling state while rolling back state for
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// a software transactional memory transaction.
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//
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// UNTHROWN_OBJ is non-null if we've called __cxa_allocate_exception
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// but not yet called __cxa_throw for it.
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//
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// CLEANUP_EXC is non-null if we're currently processing a cleanup
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// along an exception path, but we've not caught the exception yet.
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//
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// CAUGHT_COUNT is the nesting depth of __cxa_begin_catch within
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// the transaction; undo as if calling __cxa_end_catch that many times.
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extern "C" void
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__cxxabiv1::__cxa_tm_cleanup (void *unthrown_obj,
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void *cleanup_exc,
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unsigned int caught_count) throw()
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{
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__cxa_eh_globals *globals = __cxa_get_globals_fast ();
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// Handle a C++ exception not yet thrown.
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if (unthrown_obj)
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{
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globals->uncaughtExceptions -= 1;
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__cxa_free_exception (unthrown_obj);
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}
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// Handle an exception not yet caught ie. processing a cleanup
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// in between the throw and the catch.
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if (cleanup_exc)
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{
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_Unwind_Exception *eo
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= reinterpret_cast <_Unwind_Exception *>(cleanup_exc);
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if (__is_gxx_exception_class (eo->exception_class))
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free_any_cxa_exception (eo);
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else
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_Unwind_DeleteException (eo);
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}
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// Do __cxa_end_catch caught_count times, but don't bother running
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// the destructors for the objects involved. All of that is being
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// undone by the transaction restart.
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if (caught_count > 0)
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{
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__cxa_exception *h = globals->caughtExceptions;
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// Rethrown foreign exceptions are removed from the stack immediately.
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// We would have freed this exception via THIS_EXC above.
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if (h == NULL)
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return;
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do
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{
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__cxa_exception *next;
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_Unwind_Exception *eo = &h->unwindHeader;
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if (__is_gxx_exception_class (eo->exception_class))
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{
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next = h->nextException;
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free_any_cxa_exception (eo);
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}
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else
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{
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_Unwind_DeleteException (eo);
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next = 0;
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}
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h = next;
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}
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while (--caught_count);
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globals->caughtExceptions = h;
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}
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}
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