123 lines
4.9 KiB
C
123 lines
4.9 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/alg.h"
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#include "libc/alg/bisectcarleft.h"
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#include "libc/bits/safemacros.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/hefty/spawn.h"
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#include "libc/conv/conv.h"
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#include "libc/dce.h"
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#include "libc/fmt/fmt.h"
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#include "libc/log/backtrace.h"
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#include "libc/log/log.h"
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#include "libc/nexgen32e/gc.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#define kBacktraceMaxFrames 128
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#define kBacktraceBufSize ((kBacktraceMaxFrames - 1) * (16 + 1))
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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 rc, pid, tubes[3];
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struct Garbages *garbage;
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const struct StackFrame *frame;
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const char *debugbin, *p1, *p2, *p3, *addr2line;
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char buf[kBacktraceBufSize], *argv[kBacktraceMaxFrames];
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if (!(debugbin = FindDebugBinary()) || !(addr2line = GetAddr2linePath())) {
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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(g_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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addr = frame->addr;
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if (addr == weakaddr("CollectGarbage")) {
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do {
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--gi;
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} while ((addr = garbage->p[gi].ret) == weakaddr("CollectGarbage"));
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}
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argv[i++] = &buf[j];
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j += snprintf(&buf[j], 17, "%#x", addr - 1) + 1;
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}
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argv[i++] = NULL;
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tubes[0] = STDIN_FILENO;
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tubes[1] = -1;
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tubes[2] = STDERR_FILENO;
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if ((pid = spawnve(0, tubes, addr2line, argv, environ)) == -1) {
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return -1;
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}
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while ((got = read(tubes[1], buf, kBacktraceBufSize)) > 0) {
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for (p1 = buf; 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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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(fd, 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(fd, p1, got);
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break;
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}
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}
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}
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close(tubes[1]);
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if (waitpid(pid, &rc, 0) == -1) return -1;
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if (WEXITSTATUS(rc) != 0) return -1;
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return 0;
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}
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static int PrintBacktrace(int fd, const struct StackFrame *bp) {
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if (!IsTiny()) {
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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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static bool noreentry;
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if (!bp) bp = __builtin_frame_address(0);
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if (!noreentry) {
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noreentry = true;
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PrintBacktrace(fd, bp);
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noreentry = 0;
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}
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}
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