cosmopolitan/libc/log/backtrace3.c

90 lines
4.1 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/bisectcarleft.internal.h"
#include "libc/assert.h"
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/fmt/fmt.h"
#include "libc/fmt/itoa.h"
#include "libc/log/backtrace.internal.h"
#include "libc/macros.h"
#include "libc/nexgen32e/gc.internal.h"
#include "libc/nexgen32e/stackframe.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/symbols.internal.h"
#include "libc/str/str.h"
/**
* Prints stack frames with symbols.
*
* PrintBacktraceUsingSymbols(STDOUT_FILENO, NULL, GetSymbolTable());
*
* @param f is output stream
* @param bp is rbp which can be NULL to detect automatically
* @param st is open symbol table for current executable
* @return -1 w/ errno if error happened
*/
int PrintBacktraceUsingSymbols(int fd, const struct StackFrame *bp,
struct SymbolTable *st) {
char *p;
size_t gi;
intptr_t addr;
int64_t addend;
struct Garbages *garbage;
char buf[256], ibuf[21];
const struct Symbol *symbol;
const struct StackFrame *frame;
if (!st) return -1;
if (!bp) bp = __builtin_frame_address(0);
garbage = weaken(__garbage);
gi = garbage ? garbage->i : 0;
for (frame = bp; frame; frame = frame->next) {
addr = frame->addr;
if (addr == weakaddr("__gc")) {
do {
--gi;
} while ((addr = garbage->p[gi].ret) == weakaddr("__gc"));
}
p = buf;
p = mempcpy(p, ibuf, uint64toarray_fixed16((intptr_t)frame, ibuf, 48));
*p++ = ' ';
p = mempcpy(p, ibuf, uint64toarray_fixed16(addr, ibuf, 48));
*p++ = ' ';
if (st->count && ((intptr_t)addr >= (intptr_t)&_base &&
(intptr_t)addr <= (intptr_t)&_end)) {
symbol = &st->symbols[bisectcarleft((const int32_t(*)[2])st->symbols,
st->count, addr - st->addr_base - 1)];
p = stpcpy(p, &st->name_base[symbol->name_rva]);
addend = addr - st->addr_base - symbol->addr_rva;
*p++ = addend >= 0 ? '+' : '-';
if (addend) *p++ = '0', *p++ = 'x';
p = mempcpy(p, ibuf, uint64toarray_radix16(ABS(addend), ibuf));
} else {
p = stpcpy(p, "UNKNOWN");
}
*p++ = '\r';
*p++ = '\n';
if (write(fd, buf, p - buf) == -1) {
return -1;
}
}
return 0;
}