132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
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/* Copyright (C) 1999-2022 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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#undef __cxa_atexit
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#define atomic_write_barrier() __asm__ ("eieio" ::: "memory")
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int
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attribute_hidden
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__internal_atexit (void (*func) (void *), void *arg, void *d,
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struct exit_function_list **listp)
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{
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struct exit_function *new = __new_exitfn (listp);
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if (new == NULL)
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return -1;
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#ifdef PTR_MANGLE
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PTR_MANGLE (func);
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#endif
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new->func.cxa.fn = (void (*) (void *, int)) func;
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new->func.cxa.arg = arg;
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new->func.cxa.dso_handle = d;
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atomic_write_barrier ();
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new->flavor = ef_cxa;
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return 0;
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}
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/* Register a function to be called by exit or when a shared library
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is unloaded. This function is only called from code generated by
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the C++ compiler. */
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int
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__cxa_atexit (void (*func) (void *), void *arg, void *d)
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{
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return __internal_atexit (func, arg, d, &__exit_funcs);
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}
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INTDEF(__cxa_atexit)
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static struct exit_function_list initial;
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struct exit_function_list *__exit_funcs = &initial;
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uint64_t __new_exitfn_called;
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struct exit_function *
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__new_exitfn (struct exit_function_list **listp)
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{
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struct exit_function_list *p = NULL;
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struct exit_function_list *l;
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struct exit_function *r = NULL;
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size_t i = 0;
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for (l = *listp; l != NULL; p = l, l = l->next)
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{
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for (i = l->idx; i > 0; --i)
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if (l->fns[i - 1].flavor != ef_free)
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break;
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if (i > 0)
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break;
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/* This block is completely unused. */
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l->idx = 0;
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}
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if (l == NULL || i == sizeof (l->fns) / sizeof (l->fns[0]))
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{
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/* The last entry in a block is used. Use the first entry in
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the previous block if it exists. Otherwise create a new one. */
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if (p == NULL)
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{
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assert (l != NULL);
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p = (struct exit_function_list *)
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calloc (1, sizeof (struct exit_function_list));
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if (p != NULL)
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{
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p->next = *listp;
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*listp = p;
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}
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}
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if (p != NULL)
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{
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r = &p->fns[0];
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p->idx = 1;
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}
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}
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else
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{
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/* There is more room in the block. */
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r = &l->fns[i];
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l->idx = i + 1;
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}
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/* Mark entry as used, but we don't know the flavor now. */
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if (r != NULL)
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{
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r->flavor = ef_us;
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++__new_exitfn_called;
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}
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return r;
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}
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