55 lines
2.6 KiB
C
55 lines
2.6 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/itoa.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "third_party/dlmalloc/dlmalloc.internal.h"
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static uintptr_t lastfree_;
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void *AddressBirthAction(void *addr) {
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char buf[64], *p;
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p = buf;
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p = stpcpy(p, __FUNCTION__);
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p = stpcpy(p, ": 0x");
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p += uint64toarray_radix16((uintptr_t)addr, p);
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*p++ = '\n';
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__print(buf, p - buf);
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if (lastfree_ == (uintptr_t)addr) {
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lastfree_ = 0;
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}
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return addr;
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}
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void *AddressDeathAction(void *addr) {
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char buf[64], *p;
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p = buf;
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p = stpcpy(p, __FUNCTION__);
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p = stpcpy(p, ": 0x");
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p += uint64toarray_radix16((uintptr_t)addr, p);
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if (lastfree_ != (uintptr_t)addr) {
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lastfree_ = (uintptr_t)addr;
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} else {
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p = stpcpy(p, " [OBVIOUS DOUBLE FREE]");
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}
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*p++ = '\n';
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__print(buf, p - buf);
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return addr;
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}
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