86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Copyright (C) 1999-2020 Free Software Foundation, Inc.
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NOTE: This source is derived from an old version taken from the GNU C
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Library (glibc).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC 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
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for 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 <assert.h>
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#include <stdlib.h>
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#include "exit.h"
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static boolean_t
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catomic_compare_and_exchange_bool_acq (long *mem, long newval, long oldval)
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{
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return ! __atomic_compare_exchange (mem, &oldval, &newval, 0,
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__ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
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}
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/* If D is non-NULL, call all functions registered with `__cxa_atexit'
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with the same dso handle. Otherwise, if D is NULL, call all of the
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registered handlers. */
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void
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__cxa_finalize (void *d)
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{
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struct exit_function_list *funcs;
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restart:
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for (funcs = __exit_funcs; funcs; funcs = funcs->next)
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{
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struct exit_function *f;
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for (f = &funcs->fns[funcs->idx - 1]; f >= &funcs->fns[0]; --f)
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{
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void (*cxafn) (void *arg, int status);
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void *cxaarg;
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if ((d == NULL || d == f->func.cxa.dso_handle)
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/* We don't want to run this cleanup more than once. */
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&& (cxafn = f->func.cxa.fn,
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cxaarg = f->func.cxa.arg,
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! catomic_compare_and_exchange_bool_acq (&f->flavor, ef_free,
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ef_cxa)))
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{
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uint64_t check = __new_exitfn_called;
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#ifdef PTR_DEMANGLE
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PTR_DEMANGLE (cxafn);
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#endif
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cxafn (cxaarg, 0);
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/* It is possible that that last exit function registered
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more exit functions. Start the loop over. */
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if (__builtin_expect (check != __new_exitfn_called, 0))
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goto restart;
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}
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}
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}
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/* Remove the registered fork handlers. We do not have to
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unregister anything if the program is going to terminate anyway. */
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#ifdef UNREGISTER_ATFORK
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if (d != NULL)
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UNREGISTER_ATFORK (d);
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#endif
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}
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