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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libitm/] [eh_cpp.cc] - Blame information for rev 772

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1 737 jeremybenn
/* Copyright (C) 2009, 2011, 2012 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) && !defined (__MACH__)
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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 NULL; }
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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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