198 lines
4.4 KiB
C
198 lines
4.4 KiB
C
/*
|
|
* This module derived from code donated to the FreeBSD Project by
|
|
* Matthew Dillon <dillon@backplane.com>
|
|
*
|
|
* Copyright (c) 1998 The FreeBSD Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk
|
|
*/
|
|
|
|
#include "zalloc_defs.h"
|
|
|
|
static MemPool MallocPool;
|
|
|
|
#ifdef DMALLOCDEBUG
|
|
static int MallocMax;
|
|
static int MallocCount;
|
|
|
|
void mallocstats(void);
|
|
#endif
|
|
|
|
#ifdef malloc
|
|
#undef malloc
|
|
#undef free
|
|
#endif
|
|
|
|
#ifdef __alpha__
|
|
void
|
|
free_region(void *start, void *end)
|
|
{
|
|
zextendPool(&MallocPool, start, (caddr_t)end - (caddr_t)start);
|
|
zfree(&MallocPool, start, (caddr_t)end - (caddr_t)start);
|
|
}
|
|
#endif
|
|
|
|
void *
|
|
malloc(size_t bytes)
|
|
{
|
|
Guard *res;
|
|
|
|
#ifdef USEENDGUARD
|
|
bytes += MALLOCALIGN + 1;
|
|
#else
|
|
bytes += MALLOCALIGN;
|
|
#endif
|
|
|
|
while ((res = znalloc(&MallocPool, bytes)) == NULL) {
|
|
int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK;
|
|
char *base;
|
|
|
|
if ((base = sbrk(incr)) == (char *)-1)
|
|
return(NULL);
|
|
zextendPool(&MallocPool, base, incr);
|
|
zfree(&MallocPool, base, incr);
|
|
}
|
|
#ifdef DMALLOCDEBUG
|
|
if (++MallocCount > MallocMax)
|
|
MallocMax = MallocCount;
|
|
#endif
|
|
#ifdef USEGUARD
|
|
res->ga_Magic = GAMAGIC;
|
|
#endif
|
|
res->ga_Bytes = bytes;
|
|
#ifdef USEENDGUARD
|
|
*((char *)res + bytes - 1) = -2;
|
|
#endif
|
|
return((char *)res + MALLOCALIGN);
|
|
}
|
|
|
|
void
|
|
free(void *ptr)
|
|
{
|
|
size_t bytes;
|
|
|
|
if (ptr != NULL) {
|
|
Guard *res = (void *)((char *)ptr - MALLOCALIGN);
|
|
|
|
#ifdef USEGUARD
|
|
if (res->ga_Magic != GAMAGIC)
|
|
panic("free: guard1 fail @ %p", ptr);
|
|
res->ga_Magic = -1;
|
|
#endif
|
|
#ifdef USEENDGUARD
|
|
if (*((char *)res + res->ga_Bytes - 1) != -2)
|
|
panic("free: guard2 fail @ %p + %d", ptr, res->ga_Bytes - MALLOCALIGN);
|
|
*((char *)res + res->ga_Bytes - 1) = -1;
|
|
#endif
|
|
|
|
bytes = res->ga_Bytes;
|
|
zfree(&MallocPool, res, bytes);
|
|
#ifdef DMALLOCDEBUG
|
|
--MallocCount;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
|
|
void *
|
|
calloc(size_t n1, size_t n2)
|
|
{
|
|
iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2;
|
|
void *res;
|
|
|
|
if ((res = malloc(bytes)) != NULL) {
|
|
bzero(res, bytes);
|
|
#ifdef DMALLOCDEBUG
|
|
if (++MallocCount > MallocMax)
|
|
MallocMax = MallocCount;
|
|
#endif
|
|
}
|
|
return(res);
|
|
}
|
|
|
|
/*
|
|
* realloc() - I could be fancier here and free the old buffer before
|
|
* allocating the new one (saving potential fragmentation
|
|
* and potential buffer copies). But I don't bother.
|
|
*/
|
|
|
|
void *
|
|
realloc(void *ptr, size_t size)
|
|
{
|
|
void *res;
|
|
size_t old;
|
|
|
|
if ((res = malloc(size)) != NULL) {
|
|
if (ptr) {
|
|
old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN;
|
|
if (old < size)
|
|
bcopy(ptr, res, old);
|
|
else
|
|
bcopy(ptr, res, size);
|
|
free(ptr);
|
|
} else {
|
|
#ifdef DMALLOCDEBUG
|
|
if (++MallocCount > MallocMax)
|
|
MallocMax = MallocCount;
|
|
#ifdef EXITSTATS
|
|
if (DidAtExit == 0) {
|
|
DidAtExit = 1;
|
|
atexit(mallocstats);
|
|
}
|
|
#endif
|
|
#endif
|
|
}
|
|
}
|
|
return(res);
|
|
}
|
|
|
|
void *
|
|
reallocf(void *ptr, size_t size)
|
|
{
|
|
void *res;
|
|
|
|
if ((res = realloc(ptr, size)) == NULL)
|
|
free(ptr);
|
|
return(res);
|
|
}
|
|
|
|
#ifdef DMALLOCDEBUG
|
|
|
|
void
|
|
mallocstats(void)
|
|
{
|
|
printf("Active Allocations: %d/%d\n", MallocCount, MallocMax);
|
|
#ifdef ZALLOCDEBUG
|
|
zallocstats(&MallocPool);
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|