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Make old C++ demangler asynchronous signal safe

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It's now possible to safely print C++ backtraces from signal handlers.
This symbol demangler doesn't need malloc, tls, or even static memory.
Additionally, this change makes it 2x faster and adds test cases. It's
almost as performant and accurate as the libcxxabi implementation now.
This commit is contained in:
Justine Tunney 2024-05-07 03:06:12 -07:00
parent a6ecbb747d
commit 57c0b065c8
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GPG key ID: BE714B4575D6E328
10 changed files with 42326 additions and 1979 deletions
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68
libc/str/strtoul.c Normal file
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@ -0,0 +1,68 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/errno.h"
#include "libc/fmt/conv.h"
#include "libc/fmt/internal.h"
#include "libc/limits.h"
#include "libc/stdckdint.h"
#include "libc/str/str.h"
#include "libc/str/tab.internal.h"
/**
* Decodes unsigned integer from ASCII string.
*
* @param s is a non-null nul-terminated string
* @param endptr if non-null will always receive a pointer to the char
* following the last one this function processed, which is usually
* the NUL byte, or in the case of invalid strings, would point to
* the first invalid character
* @param base can be anywhere between [2,36] or 0 to auto-detect based
* on the the prefixes 0 (octal), 0x (hexadecimal), 0b (binary), or
* decimal (base 10) by default
* @return decoded integer mod 2⁶⁴ negated if leading `-`
* @raise ERANGE on overflow
*/
unsigned long strtoul(const char *s, char **endptr, int base) {
char t = 0;
int d, c = *s;
unsigned long x = 0;
CONSUME_SPACES(char, s, c);
GET_SIGN(s, c, d);
GET_RADIX(s, c, base);
if ((c = kBase36[c & 255]) && --c < base) {
t |= 1;
do {
if (ckd_mul(&x, x, base) || ckd_add(&x, x, c)) {
if (endptr) {
*endptr = (char *)(s + 1);
}
errno = ERANGE;
return ULONG_MAX;
}
} while ((c = kBase36[*++s & 255]) && --c < base);
}
if (t && endptr) {
*endptr = (char *)s;
}
return d > 0 ? x : -x;
}
__weak_reference(strtoul, strtoumax);
__weak_reference(strtoul, strtoull);
__weak_reference(strtoul, strtoull_l);