mirror of git://gcc.gnu.org/git/gcc.git
126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
// -*- C++ -*- Exception handling routines for Transactional Memory.
|
|
// Copyright (C) 2009-2019 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of GCC.
|
|
//
|
|
// GCC is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 3, or (at your option)
|
|
// any later version.
|
|
//
|
|
// GCC is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
#include <cstdlib>
|
|
#include "unwind-cxx.h"
|
|
#include "eh_atomics.h"
|
|
|
|
using namespace __cxxabiv1;
|
|
|
|
// Free one C++ exception.
|
|
|
|
static void
|
|
free_any_cxa_exception (_Unwind_Exception *eo)
|
|
{
|
|
__cxa_refcounted_exception *h
|
|
= __get_refcounted_exception_header_from_ue (eo);
|
|
|
|
if (__is_dependent_exception (eo->exception_class))
|
|
{
|
|
__cxa_dependent_exception *dep
|
|
= __get_dependent_exception_from_ue (eo);
|
|
|
|
h = __get_refcounted_exception_header_from_obj (dep->primaryException);
|
|
|
|
__cxa_free_dependent_exception (dep);
|
|
}
|
|
|
|
if (__gnu_cxx::__eh_atomic_dec (&h->referenceCount))
|
|
__cxa_free_exception (h + 1);
|
|
}
|
|
|
|
// Cleanup exception handling state while rolling back state for
|
|
// a software transactional memory transaction.
|
|
//
|
|
// UNTHROWN_OBJ is non-null if we've called __cxa_allocate_exception
|
|
// but not yet called __cxa_throw for it.
|
|
//
|
|
// CLEANUP_EXC is non-null if we're currently processing a cleanup
|
|
// along an exception path, but we've not caught the exception yet.
|
|
//
|
|
// CAUGHT_COUNT is the nesting depth of __cxa_begin_catch within
|
|
// the transaction; undo as if calling __cxa_end_catch that many times.
|
|
|
|
extern "C" void
|
|
__cxxabiv1::__cxa_tm_cleanup (void *unthrown_obj,
|
|
void *cleanup_exc,
|
|
unsigned int caught_count) throw()
|
|
{
|
|
__cxa_eh_globals *globals = __cxa_get_globals_fast ();
|
|
|
|
// Handle a C++ exception not yet thrown.
|
|
if (unthrown_obj)
|
|
{
|
|
globals->uncaughtExceptions -= 1;
|
|
__cxa_free_exception (unthrown_obj);
|
|
}
|
|
|
|
// Handle an exception not yet caught ie. processing a cleanup
|
|
// in between the throw and the catch.
|
|
if (cleanup_exc)
|
|
{
|
|
_Unwind_Exception *eo
|
|
= reinterpret_cast <_Unwind_Exception *>(cleanup_exc);
|
|
if (__is_gxx_exception_class (eo->exception_class))
|
|
free_any_cxa_exception (eo);
|
|
else
|
|
_Unwind_DeleteException (eo);
|
|
}
|
|
|
|
// Do __cxa_end_catch caught_count times, but don't bother running
|
|
// the destructors for the objects involved. All of that is being
|
|
// undone by the transaction restart.
|
|
if (caught_count > 0)
|
|
{
|
|
__cxa_exception *h = globals->caughtExceptions;
|
|
|
|
// Rethrown foreign exceptions are removed from the stack immediately.
|
|
// We would have freed this exception via THIS_EXC above.
|
|
if (h == NULL)
|
|
return;
|
|
|
|
do
|
|
{
|
|
__cxa_exception *next;
|
|
_Unwind_Exception *eo = &h->unwindHeader;
|
|
|
|
if (__is_gxx_exception_class (eo->exception_class))
|
|
{
|
|
next = h->nextException;
|
|
free_any_cxa_exception (eo);
|
|
}
|
|
else
|
|
{
|
|
_Unwind_DeleteException (eo);
|
|
next = 0;
|
|
}
|
|
|
|
h = next;
|
|
}
|
|
while (--caught_count);
|
|
|
|
globals->caughtExceptions = h;
|
|
}
|
|
}
|