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https://github.com/jart/cosmopolitan.git
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eb40cb371d
This change implements a new approach to function call logging, that's based on the GCC flag: -fpatchable-function-entry. Read the commentary in build/config.mk to learn how it works.
66 lines
3.4 KiB
C
66 lines
3.4 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/atomic.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/errno.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/weaken.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/log/internal.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/tls.h"
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relegated void __assert_fail(const char *expr, const char *file, int line) {
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int me, owner;
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static atomic_int once;
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if (!__assert_disable) {
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strace_enabled(-1);
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ftrace_enabled(-1);
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owner = 0;
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me = __tls_enabled ? __get_tls()->tib_tid : __pid;
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 0);
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kprintf("%s:%d: assert(%s) failed (tid %d) %m\n", file, line, expr, me);
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if (__vforked ||
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atomic_compare_exchange_strong_explicit(
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&once, &owner, me, memory_order_relaxed, memory_order_relaxed)) {
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__restore_tty();
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if (_weaken(ShowBacktrace)) {
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_weaken(ShowBacktrace)(2, __builtin_frame_address(0));
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} else if (_weaken(PrintBacktraceUsingSymbols) &&
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_weaken(GetSymbolTable)) {
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_weaken(PrintBacktraceUsingSymbols)(2, __builtin_frame_address(0),
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_weaken(GetSymbolTable)());
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} else {
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kprintf("can't backtrace b/c `ShowCrashReports` not linked\n");
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}
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_Exitr(23);
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} else if (owner == me) {
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kprintf("assert failed while failing\n");
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_Exitr(24);
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} else {
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_Exit1(25);
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}
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}
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}
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