2 * This module derived from code donated to the FreeBSD Project by
3 * Matthew Dillon <dillon@backplane.com>
5 * Copyright (c) 1998 The FreeBSD Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
32 * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk
35 #include "zalloc_defs.h"
37 static MemPool MallocPool;
41 static int MallocCount;
43 void mallocstats(void);
51 static void *Malloc_align(size_t, size_t);
54 # define MIN(a,b) ((a) <= (b)) ? (a) : (b)
58 Malloc(size_t bytes, const char *file __unused, int line __unused)
60 return (Malloc_align(bytes, 1));
64 Memalign(size_t alignment, size_t bytes, const char *file __unused,
70 return (Malloc_align(bytes, alignment));
74 Malloc_align(size_t bytes, size_t alignment)
79 bytes += MALLOCALIGN + 1;
84 while ((res = znalloc(&MallocPool, bytes, alignment)) == NULL) {
85 int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK;
88 if ((base = sbrk(incr)) == (char *)-1)
90 zextendPool(&MallocPool, base, incr);
91 zfree(&MallocPool, base, incr);
94 if (++MallocCount > MallocMax)
95 MallocMax = MallocCount;
98 res->ga_Magic = GAMAGIC;
100 res->ga_Bytes = bytes;
102 *((signed char *)res + bytes - 1) = -2;
105 return ((char *)res + MALLOCALIGN);
109 Free(void *ptr, const char *file, int line)
114 Guard *res = (void *)((char *)ptr - MALLOCALIGN);
119 if (res->ga_Magic == GAFREE) {
120 printf("free: duplicate free @ %p from %s:%d\n",
124 if (res->ga_Magic != GAMAGIC) {
127 dump_bytes = MIN((ptr - MallocPool.mp_Base), 512);
128 hexdump(ptr - dump_bytes, dump_bytes);
129 panic("free: guard1 fail @ %p from %s:%d",
132 res->ga_Magic = GAFREE;
135 if (*((signed char *)res + res->ga_Bytes - 1) == -1) {
136 printf("free: duplicate2 free @ %p from %s:%d\n",
140 if (*((signed char *)res + res->ga_Bytes - 1) != -2)
141 panic("free: guard2 fail @ %p + %zu from %s:%d",
142 ptr, res->ga_Bytes - MALLOCALIGN, file, line);
143 *((signed char *)res + res->ga_Bytes - 1) = -1;
146 bytes = res->ga_Bytes;
147 zfree(&MallocPool, res, bytes);
156 Calloc(size_t n1, size_t n2, const char *file, int line)
158 uintptr_t bytes = (uintptr_t)n1 * (uintptr_t)n2;
161 if ((res = Malloc(bytes, file, line)) != NULL) {
164 if (++MallocCount > MallocMax)
165 MallocMax = MallocCount;
172 * realloc() - I could be fancier here and free the old buffer before
173 * allocating the new one (saving potential fragmentation
174 * and potential buffer copies). But I don't bother.
178 Realloc(void *ptr, size_t size, const char *file, int line)
183 if ((res = Malloc(size, file, line)) != NULL) {
185 Guard *g = (Guard *)((char *)ptr - MALLOCALIGN);
187 old = g->ga_Bytes - MALLOCALIGN;
189 bcopy(ptr, res, old);
191 bcopy(ptr, res, size);
192 Free(ptr, file, line);
195 if (++MallocCount > MallocMax)
196 MallocMax = MallocCount;
198 if (DidAtExit == 0) {
210 Reallocf(void *ptr, size_t size, const char *file, int line)
214 if ((res = Realloc(ptr, size, file, line)) == NULL)
215 Free(ptr, file, line);
224 printf("Active Allocations: %d/%d\n", MallocCount, MallocMax);
226 zallocstats(&MallocPool);