mirror of
https://github.com/jart/cosmopolitan.git
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71 lines
3.3 KiB
C
71 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/intrin/weaken.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/intrin/cxaatexit.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/nexgen32e/bsr.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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STATIC_YOINK("__cxa_finalize");
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/**
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* Adds global destructor.
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*
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* Destructors are called in reverse order. They won't be called if the
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* program aborts or _exit() is called. Invocations of this function are
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* usually generated by the C++ compiler. Behavior is limitless if some
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* other module has linked calloc().
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*
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* @param fp is void(*)(T)
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* @param arg is passed to callback
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* @param pred can be non-null for things like dso modules
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* @return 0 on success or nonzero w/ errno
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* @note folks have forked libc in past just to unbloat atexit()
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*/
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noasan int __cxa_atexit(void *fp, void *arg, void *pred) {
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/* asan runtime depends on this function */
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unsigned i;
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struct CxaAtexitBlock *b, *b2;
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_Static_assert(ATEXIT_MAX == CHAR_BIT * sizeof(b->mask), "");
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__cxa_lock();
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b = __cxa_blocks.p;
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if (!b) b = __cxa_blocks.p = &__cxa_blocks.root;
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if (!~b->mask) {
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if (weaken(calloc) &&
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(b2 = weaken(calloc)(1, sizeof(struct CxaAtexitBlock)))) {
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b2->next = b;
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__cxa_blocks.p = b = b2;
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} else {
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__cxa_unlock();
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return enomem();
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}
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}
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i = bsr(~b->mask);
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assert(i < ARRAYLEN(b->p));
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b->mask |= 1u << i;
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b->p[i].fp = fp;
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b->p[i].arg = arg;
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b->p[i].pred = pred;
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__cxa_unlock();
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return 0;
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}
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