mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
191 lines
6.7 KiB
C
191 lines
6.7 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/alg/alg.h"
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#include "libc/alg/bisectcarleft.internal.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/fmt/fmt.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/log/color.internal.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/log/log.h"
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#include "libc/nexgen32e/gc.internal.h"
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#include "libc/runtime/gc.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/stdio/append.internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/x/x.h"
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#define kBacktraceMaxFrames 128
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#define kBacktraceBufSize ((kBacktraceMaxFrames - 1) * (18 + 1))
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static void ShowHint(const char *s) {
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kprintf("%snote: %s%s\n", SUBTLE, s, RESET);
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}
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static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
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ssize_t got;
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intptr_t addr;
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size_t i, j, gi;
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int ws, pid, pipefds[2];
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struct Garbages *garbage;
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const struct StackFrame *frame;
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char *debugbin, *p1, *p2, *p3, *addr2line;
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char buf[kBacktraceBufSize], *argv[kBacktraceMaxFrames];
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if (!(debugbin = FindDebugBinary())) {
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return -1;
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}
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if (!(addr2line = GetAddr2linePath())) {
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if (IsLinux()) {
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ShowHint("can't find addr2line on path or in ADDR2LINE");
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}
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return -1;
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}
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// DWARF is a weak standard. Platforms that use LLVM or old GNU
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// usually can't be counted upon to print backtraces correctly.
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if (!IsLinux() && !IsWindows()) {
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ShowHint("won't print addr2line backtrace because probably llvm");
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return -1;
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}
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if (IsWindows()) {
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// TODO: We need a way to *not* pass //?/C:/... paths to mingw
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return -1;
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}
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i = 0;
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j = 0;
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argv[i++] = "addr2line";
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argv[i++] = "-a"; /* filter out w/ shell script wrapper for old versions */
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argv[i++] = "-pCife";
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argv[i++] = debugbin;
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garbage = weaken(__garbage);
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gi = garbage ? garbage->i : 0;
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for (frame = bp; frame && i < kBacktraceMaxFrames - 1; frame = frame->next) {
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if (!IsValidStackFramePointer(frame)) {
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return -1;
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}
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addr = frame->addr;
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if (addr == weakaddr("__gc")) {
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do {
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--gi;
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} while ((addr = garbage->p[gi].ret) == weakaddr("__gc"));
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}
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argv[i++] = buf + j;
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buf[j++] = '0';
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buf[j++] = 'x';
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j += uint64toarray_radix16(addr - 1, buf + j) + 1;
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}
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argv[i++] = NULL;
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pipe(pipefds);
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if (!(pid = vfork())) {
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dup2(pipefds[1], 1);
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if (pipefds[0] != 1) close(pipefds[0]);
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if (pipefds[1] != 1) close(pipefds[1]);
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execve(addr2line, argv, environ);
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_exit(127);
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}
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close(pipefds[1]);
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for (;;) {
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got = read(pipefds[0], buf, kBacktraceBufSize);
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if (!got) break;
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if (got == -1 && errno == EINTR) {
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errno = 0;
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continue;
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}
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if (got == -1) {
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kprintf("error reading backtrace %m\n");
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break;
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}
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p1 = buf;
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p3 = p1 + got;
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/*
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* remove racist output from gnu tooling, that can't be disabled
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* otherwise, since it breaks other tools like emacs that aren't
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* equipped to ignore it, and what's most problematic is that
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* addr2line somehow manages to put the racism onto the one line
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* in the backtrace we actually care about.
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*/
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for (got = p3 - buf, p1 = buf; got;) {
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if ((p2 = memmem(p1, got, " (discriminator ",
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strlen(" (discriminator ") - 1)) &&
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(p3 = memchr(p2, '\n', got - (p2 - p1)))) {
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if (p3 > p2 && p3[-1] == '\r') --p3;
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__write(p1, p2 - p1);
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got -= p3 - p1;
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p1 += p3 - p1;
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} else {
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__write(p1, got);
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break;
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}
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}
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}
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close(pipefds[0]);
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while (waitpid(pid, &ws, 0) == -1) {
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if (errno == EINTR) continue;
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return -1;
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}
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if (WIFEXITED(ws) && !WEXITSTATUS(ws)) {
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return 0;
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} else {
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return -1;
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}
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}
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static int PrintBacktrace(int fd, const struct StackFrame *bp) {
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if (!IsTiny() && !__isworker) {
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if (PrintBacktraceUsingAddr2line(fd, bp) != -1) {
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return 0;
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}
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}
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return PrintBacktraceUsingSymbols(fd, bp, GetSymbolTable());
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}
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void ShowBacktrace(int fd, const struct StackFrame *bp) {
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#ifdef __FNO_OMIT_FRAME_POINTER__
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/* asan runtime depends on this function */
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__atomic_fetch_sub(&g_ftrace, 1, __ATOMIC_RELAXED);
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__atomic_fetch_sub(&__strace, 1, __ATOMIC_RELAXED);
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if (!bp) bp = __builtin_frame_address(0);
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PrintBacktrace(fd, bp);
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__atomic_fetch_add(&__strace, 1, __ATOMIC_RELAXED);
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__atomic_fetch_add(&g_ftrace, 1, __ATOMIC_RELAXED);
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#else
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(fprintf)(stderr, "ShowBacktrace() needs these flags to show C backtrace:\n"
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"\t-D__FNO_OMIT_FRAME_POINTER__\n"
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"\t-fno-omit-frame-pointer\n");
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#endif
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}
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