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/* $Id: xmalloc-debug.c,v 1.2 2007-10-04 11:52:03 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and 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 MIND, 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.
*/
#ifdef DEBUG
#include <sys/types.h>
#include <ctype.h>
#include <dlfcn.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "tmux.h"
/* Single xmalloc allocated block. */
struct xmalloc_blk {
void *caller;
void *ptr;
size_t size;
SPLAY_ENTRY(xmalloc_blk) entry;
};
/* Splay tree of allocated blocks. */
SPLAY_HEAD(xmalloc_tree, xmalloc_blk);
struct xmalloc_tree xmalloc_tree = SPLAY_INITIALIZER(&xmalloc_tree);
/* Various statistics. */
size_t xmalloc_allocated;
size_t xmalloc_freed;
size_t xmalloc_peak;
u_int xmalloc_frees;
u_int xmalloc_mallocs;
u_int xmalloc_reallocs;
/* Print function. */
#define XMALLOC_PRINT log_debug
/* Bytes of unallocated blocks and number of allocated blocks to show. */
#define XMALLOC_BYTES 8
#define XMALLOC_LINES 32
/* Macro to update peek usage variable. */
#define XMALLOC_UPDATE() do { \
if (xmalloc_allocated - xmalloc_freed > xmalloc_peak) \
xmalloc_peak = xmalloc_allocated - xmalloc_freed; \
} while (0)
/* Tree functions. */
int xmalloc_cmp(struct xmalloc_blk *, struct xmalloc_blk *);
SPLAY_PROTOTYPE(xmalloc_tree, xmalloc_blk, entry, xmalloc_cmp);
SPLAY_GENERATE(xmalloc_tree, xmalloc_blk, entry, xmalloc_cmp);
/* Compare two blocks. */
int
xmalloc_cmp(struct xmalloc_blk *blk1, struct xmalloc_blk *blk2)
{
uintptr_t ptr1 = (uintptr_t) blk1->ptr;
uintptr_t ptr2 = (uintptr_t) blk2->ptr;
if (ptr1 < ptr2)
return (-1);
if (ptr1 > ptr2)
return (1);
return (0);
}
/* Clear statistics and block list; used to start fresh after fork(2). */
void
xmalloc_clear(void)
{
struct xmalloc_blk *blk;
xmalloc_allocated = 0;
xmalloc_freed = 0;
xmalloc_peak = 0;
xmalloc_frees = 0;
xmalloc_mallocs = 0;
xmalloc_reallocs = 0;
while (!SPLAY_EMPTY(&xmalloc_tree)) {
blk = SPLAY_ROOT(&xmalloc_tree);
SPLAY_REMOVE(xmalloc_tree, &xmalloc_tree, blk);
free(blk);
}
}
/* Print report of statistics and unfreed blocks. */
void
xmalloc_report(pid_t pid, const char *hdr)
{
struct xmalloc_blk *blk;
u_char *iptr;
char buf[4 * XMALLOC_BYTES + 1], *optr;
size_t len;
u_int n;
Dl_info info;
XMALLOC_PRINT("%s: %ld: allocated=%zu, freed=%zu, difference=%zd, "
"peak=%zu", hdr, (long) pid, xmalloc_allocated, xmalloc_freed,
xmalloc_allocated - xmalloc_freed, xmalloc_peak);
XMALLOC_PRINT("%s: %ld: mallocs=%u, reallocs=%u, frees=%u", hdr,
(long) pid, xmalloc_mallocs, xmalloc_reallocs, xmalloc_frees);
n = 0;
SPLAY_FOREACH(blk, xmalloc_tree, &xmalloc_tree) {
n++;
if (n >= XMALLOC_LINES)
continue;
len = blk->size;
if (len > XMALLOC_BYTES)
len = XMALLOC_BYTES;
memset(&info, 0, sizeof info);
if (dladdr(blk->caller, &info) == 0)
info.dli_sname = info.dli_saddr = NULL;
optr = buf;
iptr = blk->ptr;
for (; len > 0; len--) {
if (isascii(*iptr) && !iscntrl(*iptr)) {
*optr++ = *iptr++;
continue;
}
*optr++ = '\\';
*optr++ = '0' + ((*iptr >> 6) & 07);
*optr++ = '0' + ((*iptr >> 3) & 07);
*optr++ = '0' + (*iptr & 07);
iptr++;
}
*optr = '\0';
XMALLOC_PRINT("%s: %ld: %u, %s+0x%02tx: [%p %zu: %s]", hdr,
(long) pid, n, info.dli_sname, ((u_char *) blk->caller) -
((u_char *) info.dli_saddr), blk->ptr, blk->size, buf);
}
XMALLOC_PRINT("%s: %ld: %u unfreed blocks", hdr, (long) pid, n);
}
/* Record a newly created block. */
void
xmalloc_new(void *caller, void *ptr, size_t size)
{
struct xmalloc_blk *blk;
xmalloc_allocated += size;
XMALLOC_UPDATE();
if ((blk = malloc(sizeof *blk)) == NULL)
abort();
blk->ptr = ptr;
blk->size = size;
blk->caller = caller;
SPLAY_INSERT(xmalloc_tree, &xmalloc_tree, blk);
xmalloc_mallocs++;
XMALLOC_UPDATE();
}
/* Record changes to a block. */
void
xmalloc_change(void *caller, void *oldptr, void *newptr, size_t newsize)
{
struct xmalloc_blk *blk, key;
ssize_t change;
if (oldptr == NULL) {
xmalloc_new(caller, newptr, newsize);
return;
}
key.ptr = oldptr;
blk = SPLAY_FIND(xmalloc_tree, &xmalloc_tree, &key);
if (blk == NULL)
return;
change = newsize - blk->size;
if (change > 0)
xmalloc_allocated += change;
else
xmalloc_freed -= change;
XMALLOC_UPDATE();
SPLAY_REMOVE(xmalloc_tree, &xmalloc_tree, blk);
blk->ptr = newptr;
blk->size = newsize;
blk->caller = caller;
SPLAY_INSERT(xmalloc_tree, &xmalloc_tree, blk);
xmalloc_reallocs++;
XMALLOC_UPDATE();
}
/* Record a block free. */
void
xmalloc_free(void *ptr)
{
struct xmalloc_blk *blk, key;
key.ptr = ptr;
blk = SPLAY_FIND(xmalloc_tree, &xmalloc_tree, &key);
if (blk == NULL)
return;
xmalloc_freed += blk->size;
SPLAY_REMOVE(xmalloc_tree, &xmalloc_tree, blk);
free(blk);
xmalloc_frees++;
XMALLOC_UPDATE();
}
#endif /* DEBUG */
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