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Trim down executable sizes

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This commit is contained in:
Justine Tunney 2021-02-11 08:37:18 -08:00
parent ec69413f83
commit bfa8581537
19 changed files with 1176 additions and 131 deletions
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46
libc/runtime/exit.c Normal file
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@ -0,0 +1,46 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/weaken.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
extern const uintptr_t __fini_array_start[];
extern const uintptr_t __fini_array_end[];
/**
* Exits process with grace.
*
* This calls functions registered by atexit() before terminating
* the current process, and any associated threads. It also calls
* all the legacy linker registered destructors in reeverse order
*
* @param exitcode is masked with 255
* @see _Exit()
* @noreturn
*/
wontreturn void exit(int exitcode) {
const uintptr_t *p;
if (weaken(__cxa_finalize)) {
weaken(__cxa_finalize)(NULL);
}
for (p = *weaken(__fini_array_end); p-- > *weaken(__fini_array_start);) {
((void (*)(void))p)();
}
_Exit(exitcode);
}