95 lines
3.7 KiB
C
95 lines
3.7 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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│ 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/calls/calls.h"
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#include "libc/calls/hefty/spawn.h"
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#include "libc/macros.h"
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#include "libc/runtime/runtime.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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char path[PATH_MAX];
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if (commandv("c++filt", 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[]){"c++filt", 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 *DemangleCxxFilt(char *p, const char *symbol) {
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int n;
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char buf[512];
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bool iscomplicated;
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if (!g_cxxfilt.pid) SpawnCxxFilt();
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if (g_cxxfilt.pid == -1) return NULL;
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if ((n = strlen(symbol)) >= ARRAYLEN(buf)) return NULL;
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memcpy(buf, symbol, n);
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buf[n] = '\n';
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write(g_cxxfilt.fds[0], buf, n + 1);
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n = read(g_cxxfilt.fds[1], buf, ARRAYLEN(buf));
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if (n > 1 && buf[n - 1] == '\n') {
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if (buf[n - 2] == '\r') --n;
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--n;
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iscomplicated = memchr(buf, ' ', n) || memchr(buf, '(', n);
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if (iscomplicated) *p++ = '"';
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p = mempcpy(p, buf, n);
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if (iscomplicated) *p++ = '"';
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*p = '\0';
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return p;
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} else {
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CloseCxxFilt();
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return NULL;
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}
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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) {
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char *r;
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if (startswith(symbol, "_Z")) {
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if ((r = DemangleCxxFilt(p, symbol))) return r;
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}
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return stpcpy(p, symbol);
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}
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