zalloc_malloc.c revision 84221
144301Swollman/* 244301Swollman * This module derived from code donated to the FreeBSD Project by 344301Swollman * Matthew Dillon <dillon@backplane.com> 444301Swollman * 544301Swollman * Copyright (c) 1998 The FreeBSD Project 644301Swollman * All rights reserved. 744301Swollman * 844301Swollman * Redistribution and use in source and binary forms, with or without 944301Swollman * modification, are permitted provided that the following conditions 1044301Swollman * are met: 1144301Swollman * 1. Redistributions of source code must retain the above copyright 1244301Swollman * notice, this list of conditions and the following disclaimer. 1344301Swollman * 2. Redistributions in binary form must reproduce the above copyright 1444301Swollman * notice, this list of conditions and the following disclaimer in the 1544301Swollman * documentation and/or other materials provided with the distribution. 1644301Swollman * 1744301Swollman * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1844301Swollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1944301Swollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2044301Swollman * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2144301Swollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2244301Swollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2344301Swollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2444301Swollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2544301Swollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2644301Swollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2744301Swollman * SUCH DAMAGE. 2844301Swollman */ 2944301Swollman 3044301Swollman#include <sys/cdefs.h> 3144301Swollman__FBSDID("$FreeBSD: head/lib/libstand/zalloc_malloc.c 84221 2001-09-30 22:28:01Z dillon $"); 3244301Swollman 3344301Swollman/* 3444301Swollman * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk 3544301Swollman */ 3644301Swollman 3744301Swollman#include "zalloc_defs.h" 3844301Swollman 3944301Swollmanstatic MemPool MallocPool; 4044301Swollman 4144301Swollman#ifdef DMALLOCDEBUG 4244301Swollmanstatic int MallocMax; 4344301Swollmanstatic int MallocCount; 4444301Swollman 4544301Swollmanvoid mallocstats(void); 4644301Swollman#endif 4744301Swollman 4844301Swollman#ifdef malloc 4944301Swollman#undef malloc 5044301Swollman#undef free 5144301Swollman#endif 5244301Swollman 5344301Swollman#ifdef __alpha__ 5444301Swollmanvoid 5544301Swollmanfree_region(void *start, void *end) 5644301Swollman{ 5744301Swollman zextendPool(&MallocPool, start, (caddr_t)end - (caddr_t)start); 5844301Swollman zfree(&MallocPool, start, (caddr_t)end - (caddr_t)start); 5974385Sphk} 6074385Sphk#endif 6174385Sphk 6274385Sphkvoid * 6344301Swollmanmalloc(size_t bytes) 6444301Swollman{ 6544301Swollman Guard *res; 6644301Swollman 6744301Swollman#ifdef USEENDGUARD 6844301Swollman bytes += MALLOCALIGN + 1; 6944301Swollman#else 7044301Swollman bytes += MALLOCALIGN; 7144301Swollman#endif 7244301Swollman 7344301Swollman while ((res = znalloc(&MallocPool, bytes)) == NULL) { 7444301Swollman int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; 7544301Swollman char *base; 7644301Swollman 7744301Swollman if ((base = sbrk(incr)) == (char *)-1) 7844301Swollman return(NULL); 7944301Swollman zextendPool(&MallocPool, base, incr); 8044301Swollman zfree(&MallocPool, base, incr); 8144301Swollman } 8244301Swollman#ifdef DMALLOCDEBUG 8344301Swollman if (++MallocCount > MallocMax) 8444301Swollman MallocMax = MallocCount; 85154479Sphk#endif 8644301Swollman#ifdef USEGUARD 8744301Swollman res->ga_Magic = GAMAGIC; 8844301Swollman#endif 8944301Swollman res->ga_Bytes = bytes; 9074385Sphk#ifdef USEENDGUARD 91154479Sphk *((char *)res + bytes - 1) = -2; 9244301Swollman#endif 9344301Swollman return((char *)res + MALLOCALIGN); 9444301Swollman} 95 96void 97free(void *ptr) 98{ 99 size_t bytes; 100 101 if (ptr != NULL) { 102 Guard *res = (void *)((char *)ptr - MALLOCALIGN); 103 104#ifdef USEGUARD 105 if (res->ga_Magic != GAMAGIC) 106 panic("free: guard1 fail @ %p", ptr); 107 res->ga_Magic = -1; 108#endif 109#ifdef USEENDGUARD 110 if (*((char *)res + res->ga_Bytes - 1) != -2) 111 panic("free: guard2 fail @ %p + %d", ptr, res->ga_Bytes - MALLOCALIGN); 112 *((char *)res + res->ga_Bytes - 1) = -1; 113#endif 114 115 bytes = res->ga_Bytes; 116 zfree(&MallocPool, res, bytes); 117#ifdef DMALLOCDEBUG 118 --MallocCount; 119#endif 120 } 121} 122 123 124void * 125calloc(size_t n1, size_t n2) 126{ 127 iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2; 128 void *res; 129 130 if ((res = malloc(bytes)) != NULL) { 131 bzero(res, bytes); 132#ifdef DMALLOCDEBUG 133 if (++MallocCount > MallocMax) 134 MallocMax = MallocCount; 135#endif 136 } 137 return(res); 138} 139 140/* 141 * realloc() - I could be fancier here and free the old buffer before 142 * allocating the new one (saving potential fragmentation 143 * and potential buffer copies). But I don't bother. 144 */ 145 146void * 147realloc(void *ptr, size_t size) 148{ 149 void *res; 150 size_t old; 151 152 if ((res = malloc(size)) != NULL) { 153 if (ptr) { 154 old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; 155 if (old < size) 156 bcopy(ptr, res, old); 157 else 158 bcopy(ptr, res, size); 159 free(ptr); 160 } else { 161#ifdef DMALLOCDEBUG 162 if (++MallocCount > MallocMax) 163 MallocMax = MallocCount; 164#ifdef EXITSTATS 165 if (DidAtExit == 0) { 166 DidAtExit = 1; 167 atexit(mallocstats); 168 } 169#endif 170#endif 171 } 172 } 173 return(res); 174} 175 176void * 177reallocf(void *ptr, size_t size) 178{ 179 void *res; 180 181 if ((res = realloc(ptr, size)) == NULL) 182 free(ptr); 183 return(res); 184} 185 186#ifdef DMALLOCDEBUG 187 188void 189mallocstats(void) 190{ 191 printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 192#ifdef ZALLOCDEBUG 193 zallocstats(&MallocPool); 194#endif 195} 196 197#endif 198 199