9e3e985ae5
Here's some screenshots of an emulator tui program that was compiled on Linux, then scp'd it to Windows, Mac, and FreeBSD. https://justine.storage.googleapis.com/blinkenlights-cmdexe.png https://justine.storage.googleapis.com/blinkenlights-imac.png https://justine.storage.googleapis.com/blinkenlights-freebsd.png https://justine.storage.googleapis.com/blinkenlights-lisp.png How is this even possible that we have a nontrivial ui binary that just works on Mac, Windows, Linux, and BSD? Surely a first ever achievement. Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in emulator for fun and profit.
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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