mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
208 lines
7 KiB
C
208 lines
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/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/rusage.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/syscall_support-sysv.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/intrin/promises.internal.h"
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#include "libc/intrin/safemacros.internal.h"
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#include "libc/intrin/strace.internal.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/color.internal.h"
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#include "libc/log/log.h"
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#include "libc/mem/alg.h"
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#include "libc/mem/bisectcarleft.internal.h"
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#include "libc/mem/gc.internal.h"
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#include "libc/nexgen32e/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.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/thread/tls.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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bool ok;
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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 (!PLEDGED(STDIO) || !PLEDGED(EXEC) || !PLEDGED(EXEC)) {
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return -1;
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}
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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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// backtrace_test.com failing on windows for some reason via runitd
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// don't want to pull in the high-level syscalls here anyway
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if (IsWindows()) {
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return -1;
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}
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// doesn't work on rhel5
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if (IsLinux() && !__is_linux_2_6_23()) {
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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 = __tls_enabled ? __get_tls()->tib_garbages : 0;
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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("__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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if (sys_pipe2(pipefds, O_CLOEXEC) == -1) {
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return -1;
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}
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if ((pid = fork()) == -1) {
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sys_close(pipefds[0]);
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sys_close(pipefds[1]);
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return -1;
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}
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if (!pid) {
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sys_dup2(pipefds[1], 1);
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sys_execve(addr2line, argv, environ);
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_Exit(127);
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}
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sys_close(pipefds[1]);
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for (;;) {
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got = sys_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(2, 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(2, p1, got);
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break;
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}
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}
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}
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sys_close(pipefds[0]);
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while (sys_wait4(pid, &ws, 0, 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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--__ftrace;
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--__strace;
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if (!bp) bp = __builtin_frame_address(0);
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PrintBacktrace(fd, bp);
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++__strace;
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++__ftrace;
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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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