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/* Copyright (C) 1999-2020 Free Software Foundation, Inc.
NOTE: This source is derived from an old version taken from the GNU C
Library (glibc).
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 <assert.h>
#include <stdlib.h>
#include "exit.h"
static boolean_t
catomic_compare_and_exchange_bool_acq (long *mem, long newval, long oldval)
{
return ! __atomic_compare_exchange (mem, &oldval, &newval, 0,
__ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
}
/* If D is non-NULL, call all functions registered with `__cxa_atexit'
with the same dso handle. Otherwise, if D is NULL, call all of the
registered handlers. */
void
__cxa_finalize (void *d)
{
struct exit_function_list *funcs;
restart:
for (funcs = __exit_funcs; funcs; funcs = funcs->next)
{
struct exit_function *f;
for (f = &funcs->fns[funcs->idx - 1]; f >= &funcs->fns[0]; --f)
{
void (*cxafn) (void *arg, int status);
void *cxaarg;
if ((d == NULL || d == f->func.cxa.dso_handle)
/* We don't want to run this cleanup more than once. */
&& (cxafn = f->func.cxa.fn,
cxaarg = f->func.cxa.arg,
! catomic_compare_and_exchange_bool_acq (&f->flavor, ef_free,
ef_cxa)))
{
uint64_t check = __new_exitfn_called;
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (cxafn);
#endif
cxafn (cxaarg, 0);
/* It is possible that that last exit function registered
more exit functions. Start the loop over. */
if (__builtin_expect (check != __new_exitfn_called, 0))
goto restart;
}
}
}
/* Remove the registered fork handlers. We do not have to
unregister anything if the program is going to terminate anyway. */
#ifdef UNREGISTER_ATFORK
if (d != NULL)
UNREGISTER_ATFORK (d);
#endif
}
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