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/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
#include "lib.h"
#include "lvm-types.h"
#include "dbg_malloc.h"
#include <stdarg.h>
struct memblock {
struct memblock *prev, *next; /* All allocated blocks are linked */
size_t length; /* Size of the requested block */
int id; /* Index of the block */
const char *file; /* File that allocated */
int line; /* Line that allocated */
void *magic; /* Address of this block */
};
static struct {
unsigned int blocks, mblocks;
unsigned int bytes, mbytes;
} _mem_stats = {
0, 0, 0, 0};
static struct memblock *_head = 0;
static struct memblock *_tail = 0;
void *malloc_aux(size_t s, const char *file, int line)
{
struct memblock *nb;
size_t tsize = s + sizeof(*nb) + sizeof(unsigned long);
if (!(nb = malloc(tsize))) {
log_error("couldn't allocate any memory, size = %" PRIuPTR, s);
return 0;
}
/* set up the file and line info */
nb->file = file;
nb->line = line;
#ifdef BOUNDS_CHECK
bounds_check();
#endif
/* setup fields */
nb->magic = nb + 1;
nb->length = s;
nb->id = ++_mem_stats.blocks;
nb->next = 0;
nb->prev = _tail;
/* link to tail of the list */
if (!_head)
_head = _tail = nb;
else {
_tail->next = nb;
_tail = nb;
}
/* stomp a pretty pattern across the new memory
and fill in the boundary bytes */
{
char *ptr = (char *) (nb + 1);
size_t i;
for (i = 0; i < s; i++)
*ptr++ = i & 0x1 ? (char) 0xba : (char) 0xbe;
for (i = 0; i < sizeof(unsigned long); i++)
*ptr++ = (char) nb->id;
}
if (_mem_stats.blocks > _mem_stats.mblocks)
_mem_stats.mblocks = _mem_stats.blocks;
_mem_stats.bytes += s;
if (_mem_stats.bytes > _mem_stats.mbytes)
_mem_stats.mbytes = _mem_stats.bytes;
return nb + 1;
}
void free_aux(void *p)
{
char *ptr;
size_t i;
struct memblock *mb = ((struct memblock *) p) - 1;
if (!p)
return;
#ifdef BOUNDS_CHECK
bounds_check();
#endif
/* sanity check */
assert(mb->magic == p);
/* check data at the far boundary */
ptr = ((char *) mb) + sizeof(struct memblock) + mb->length;
for (i = 0; i < sizeof(unsigned long); i++)
if (*ptr++ != (char) mb->id)
assert(!"Damage at far end of block");
/* have we freed this before ? */
assert(mb->id != 0);
mb->id = 0;
/* stomp a different pattern across the memory */
ptr = ((char *) mb) + sizeof(struct memblock);
for (i = 0; i < mb->length; i++)
*ptr++ = i & 1 ? (char) 0xde : (char) 0xad;
/* unlink */
if (mb->prev)
mb->prev->next = mb->next;
else
_head = mb->next;
if (mb->next)
mb->next->prev = mb->prev;
else
_tail = mb->prev;
assert(_mem_stats.blocks);
_mem_stats.blocks--;
_mem_stats.bytes -= mb->length;
/* free the memory */
free(mb);
}
void *realloc_aux(void *p, unsigned int s, const char *file, int line)
{
void *r;
struct memblock *mb = ((struct memblock *) p) - 1;
r = malloc_aux(s, file, line);
if (p) {
memcpy(r, p, mb->length);
free_aux(p);
}
return r;
}
#ifdef DEBUG_MEM
int dump_memory(void)
{
unsigned long tot = 0;
struct memblock *mb;
if (_head)
log_very_verbose("You have a memory leak:");
for (mb = _head; mb; mb = mb->next) {
print_log(_LOG_INFO, mb->file, mb->line,
"block %d at %p, size %" PRIdPTR,
mb->id, mb->magic, mb->length);
tot += mb->length;
}
if (_head)
log_very_verbose("%ld bytes leaked in total", tot);
return 1;
}
void bounds_check(void)
{
struct memblock *mb = _head;
while (mb) {
size_t i;
char *ptr = ((char *) (mb + 1)) + mb->length;
for (i = 0; i < sizeof(unsigned long); i++)
if (*ptr++ != (char) mb->id)
assert(!"Memory smash");
mb = mb->next;
}
}
#endif
/*
* Local variables:
* c-file-style: "linux"
* End:
*/
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