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118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
/* Copyright (C) 2009-2014 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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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 "libitm_i.h"
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using namespace GTM;
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/* Everything from libstdc++ is weak, to avoid requiring that library
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to be linked into plain C applications using libitm.so. */
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#define WEAK __attribute__((weak))
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extern "C" {
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extern void *__cxa_allocate_exception (size_t) WEAK;
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extern void __cxa_throw (void *, void *, void *) WEAK;
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extern void *__cxa_begin_catch (void *) WEAK;
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extern void __cxa_end_catch (void) WEAK;
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extern void __cxa_tm_cleanup (void *, void *, unsigned int) WEAK;
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#if !defined (HAVE_ELF_STYLE_WEAKREF)
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void *__cxa_allocate_exception (size_t) { return NULL; }
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void __cxa_throw (void *, void *, void *) { return; }
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void *__cxa_begin_catch (void *) { return NULL; }
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void __cxa_end_catch (void) { return; }
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void __cxa_tm_cleanup (void *, void *, unsigned int) { return; }
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void _Unwind_DeleteException (_Unwind_Exception *) { return; }
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#endif /* HAVE_ELF_STYLE_WEAKREF */
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}
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void *
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_ITM_cxa_allocate_exception (size_t size)
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{
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void *r = __cxa_allocate_exception (size);
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gtm_thr()->cxa_unthrown = r;
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return r;
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}
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void
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_ITM_cxa_throw (void *obj, void *tinfo, void *dest)
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{
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gtm_thr()->cxa_unthrown = NULL;
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__cxa_throw (obj, tinfo, dest);
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}
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void *
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_ITM_cxa_begin_catch (void *exc_ptr)
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{
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gtm_thr()->cxa_catch_count++;
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return __cxa_begin_catch (exc_ptr);
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}
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void
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_ITM_cxa_end_catch (void)
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{
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gtm_thr()->cxa_catch_count--;
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__cxa_end_catch ();
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}
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void
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GTM::gtm_thread::revert_cpp_exceptions (gtm_transaction_cp *cp)
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{
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if (cp)
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{
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// If rolling back a nested transaction, only clean up unthrown
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// exceptions since the last checkpoint. Always reset eh_in_flight
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// because it just contains the argument provided to
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// _ITM_commitTransactionEH
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void *unthrown =
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(cxa_unthrown != cp->cxa_unthrown ? cxa_unthrown : NULL);
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assert (cxa_catch_count >= cp->cxa_catch_count);
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uint32_t catch_count = cxa_catch_count - cp->cxa_catch_count;
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if (unthrown || catch_count)
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{
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__cxa_tm_cleanup (unthrown, this->eh_in_flight, catch_count);
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cxa_catch_count = cp->cxa_catch_count;
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cxa_unthrown = cp->cxa_unthrown;
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this->eh_in_flight = NULL;
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}
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}
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else
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{
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// Both cxa_catch_count and cxa_unthrown are maximal because EH regions
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// and transactions are properly nested.
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if (this->cxa_unthrown || this->cxa_catch_count)
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{
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__cxa_tm_cleanup (this->cxa_unthrown, this->eh_in_flight,
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this->cxa_catch_count);
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this->cxa_catch_count = 0;
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this->cxa_unthrown = NULL;
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this->eh_in_flight = NULL;
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}
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}
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}
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