123 lines
4.4 KiB
C
123 lines
4.4 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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│ 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/assert.h"
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#include "libc/bits/safemacros.internal.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/calls/struct/iovec.h"
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#include "libc/macros.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/sock.h"
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#include "libc/str/str.h"
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#include "tool/build/lib/demangle.h"
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struct CxxFilt {
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int pid;
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int fds[3];
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} g_cxxfilt;
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void CloseCxxFilt(void) {
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close(g_cxxfilt.fds[0]);
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close(g_cxxfilt.fds[1]);
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g_cxxfilt.pid = -1;
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}
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void SpawnCxxFilt(void) {
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int pid;
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const char *cxxfilt;
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char path[PATH_MAX];
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cxxfilt = firstnonnull(getenv("CXXFILT"), "c++filt");
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if (commandv(cxxfilt, path)) {
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g_cxxfilt.fds[0] = -1;
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g_cxxfilt.fds[1] = -1;
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g_cxxfilt.fds[2] = 2;
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if ((pid = spawnve(0, g_cxxfilt.fds, path, (char *const[]){cxxfilt, NULL},
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environ)) != -1) {
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atexit(CloseCxxFilt);
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}
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} else {
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pid = -1;
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}
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g_cxxfilt.pid = pid;
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}
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char *CopySymbol(char *p, size_t pn, const char *s, size_t sn) {
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size_t extra;
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bool showdots, iscomplicated;
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assert(pn >= 1 + 3 + 1 + 1);
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iscomplicated = memchr(s, ' ', sn) || memchr(s, '(', sn);
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extra = 1;
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if (iscomplicated) extra += 2;
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if (sn + extra > pn) {
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sn = pn - extra - 3;
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showdots = true;
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} else {
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showdots = false;
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}
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if (iscomplicated) *p++ = '"';
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p = mempcpy(p, s, sn);
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if (showdots) p = stpcpy(p, "...");
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if (iscomplicated) *p++ = '"';
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*p = '\0';
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return p;
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}
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char *DemangleCxxFilt(char *p, size_t pn, const char *s, size_t sn) {
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ssize_t rc;
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size_t got;
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struct iovec iov[2];
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static char buf[PAGESIZE];
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if (!g_cxxfilt.pid) SpawnCxxFilt();
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if (g_cxxfilt.pid == -1) return NULL;
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buf[0] = '\n';
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iov[0].iov_base = s;
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iov[0].iov_len = sn;
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iov[1].iov_base = buf;
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iov[1].iov_len = 1;
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writev(g_cxxfilt.fds[0], iov, ARRAYLEN(iov));
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if ((rc = read(g_cxxfilt.fds[1], buf, sizeof(buf))) != -1) {
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got = rc;
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if (got >= 2 && buf[got - 1] == '\n') {
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if (buf[got - 2] == '\r') --got;
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--got;
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return CopySymbol(p, pn, buf, got);
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}
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}
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CloseCxxFilt();
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return NULL;
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}
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/**
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* Decrypts C++ symbol.
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*
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* Decoding these takes roughly the same lines of code as an entire
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* x86_64 disassembler. That's just for the GNU encoding scheme. So
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* what we'll do, is just offload this work to the c++filt program.
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*/
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char *Demangle(char *p, const char *symbol, size_t n) {
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char *r;
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size_t sn;
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sn = strlen(symbol);
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if (startswith(symbol, "_Z")) {
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if ((r = DemangleCxxFilt(p, n, symbol, sn))) return r;
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}
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return CopySymbol(p, n, symbol, sn);
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}
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