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/* watch.c - watchpoint functions for malloc */
/* Copyright (C) 2001-2003 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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, either version 3 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include "imalloc.h"
#ifdef MALLOC_WATCH
#include "watch.h"
#define WATCH_MAX 32
int _malloc_nwatch;
static PTR_T _malloc_watch_list[WATCH_MAX];
static void
watch_warn (addr, file, line, type, data)
PTR_T addr;
const char *file;
int line, type;
unsigned long data;
{
char *tag;
if (type == W_ALLOC)
tag = "allocated";
else if (type == W_FREE)
tag = "freed";
else if (type == W_REALLOC)
tag = "requesting resize";
else if (type == W_RESIZED)
tag = "just resized";
else
tag = "bug: unknown operation";
fprintf (stderr, "malloc: watch alert: %p %s ", addr, tag);
if (data != (unsigned long)-1)
fprintf (stderr, "(size %lu) ", data);
fprintf (stderr, "from '%s:%d'\n", file ? file : "unknown", line);
}
void
_malloc_ckwatch (addr, file, line, type, data)
PTR_T addr;
const char *file;
int line, type;
unsigned long data;
{
register int i;
for (i = _malloc_nwatch - 1; i >= 0; i--)
{
if (_malloc_watch_list[i] == addr)
{
watch_warn (addr, file, line, type, data);
return;
}
}
}
#endif /* MALLOC_WATCH */
PTR_T
malloc_watch (addr)
PTR_T addr;
{
register int i;
PTR_T ret;
if (addr == 0)
return addr;
ret = (PTR_T)0;
#ifdef MALLOC_WATCH
for (i = _malloc_nwatch - 1; i >= 0; i--)
{
if (_malloc_watch_list[i] == addr)
break;
}
if (i < 0)
{
if (_malloc_nwatch == WATCH_MAX) /* full, take out first */
{
ret = _malloc_watch_list[0];
_malloc_nwatch--;
for (i = 0; i < _malloc_nwatch; i++)
_malloc_watch_list[i] = _malloc_watch_list[i+1];
}
_malloc_watch_list[_malloc_nwatch++] = addr;
}
#endif
return ret;
}
/* Remove a watchpoint set on ADDR. If ADDR is NULL, remove all
watchpoints. Returns ADDR if everything went OK, NULL if ADDR was
not being watched. */
PTR_T
malloc_unwatch (addr)
PTR_T addr;
{
#ifdef MALLOC_WATCH
register int i;
if (addr == 0)
{
for (i = 0; i < _malloc_nwatch; i++)
_malloc_watch_list[i] = (PTR_T)0;
_malloc_nwatch = 0;
return ((PTR_T)0);
}
else
{
for (i = 0; i < _malloc_nwatch; i++)
{
if (_malloc_watch_list[i] == addr)
break;
}
if (i == _malloc_nwatch)
return ((PTR_T)0); /* not found */
/* shuffle everything from i+1 to end down 1 */
_malloc_nwatch--;
for ( ; i < _malloc_nwatch; i++)
_malloc_watch_list[i] = _malloc_watch_list[i+1];
return addr;
}
#else
return ((PTR_T)0);
#endif
}
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