zalloc_malloc.c revision 39863
139665Smsmith/* 239665Smsmith * This module derived from code donated to the FreeBSD Project by 339665Smsmith * Matthew Dillon <dillon@backplane.com> 439665Smsmith * 539665Smsmith * Copyright (c) 1998 The FreeBSD Project 639665Smsmith * All rights reserved. 739665Smsmith * 839665Smsmith * Redistribution and use in source and binary forms, with or without 939665Smsmith * modification, are permitted provided that the following conditions 1039665Smsmith * are met: 1139665Smsmith * 1. Redistributions of source code must retain the above copyright 1239665Smsmith * notice, this list of conditions and the following disclaimer. 1339665Smsmith * 2. Redistributions in binary form must reproduce the above copyright 1439665Smsmith * notice, this list of conditions and the following disclaimer in the 1539665Smsmith * documentation and/or other materials provided with the distribution. 1639665Smsmith * 1739665Smsmith * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1839665Smsmith * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1939665Smsmith * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2039665Smsmith * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2139665Smsmith * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2239665Smsmith * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2339665Smsmith * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2439665Smsmith * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2539665Smsmith * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2639665Smsmith * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2739665Smsmith * SUCH DAMAGE. 2839665Smsmith * 2939863Smsmith * $Id: zalloc_malloc.c,v 1.2 1998/09/26 10:48:50 dfr Exp $ 3039665Smsmith */ 3139665Smsmith 3239665Smsmith/* 3339665Smsmith * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk 3439665Smsmith */ 3539665Smsmith 3639665Smsmith#include "zalloc_defs.h" 3739665Smsmith 3839863Smsmithstatic MemPool MallocPool; 3939665Smsmith 4039665Smsmith#ifdef DMALLOCDEBUG 4139665Smsmithstatic int MallocMax; 4239665Smsmithstatic int MallocCount; 4339665Smsmith 4439665Smsmithvoid mallocstats(void); 4539665Smsmith#endif 4639665Smsmith 4739672Sdfr#ifdef malloc 4839672Sdfr#undef malloc 4939672Sdfr#undef free 5039672Sdfr#endif 5139672Sdfr 5239665Smsmithvoid * 5339665Smsmithmalloc(size_t bytes) 5439665Smsmith{ 5539665Smsmith Guard *res; 5639665Smsmith 5739665Smsmith#ifdef USEENDGUARD 5839665Smsmith bytes += MALLOCALIGN + 1; 5939665Smsmith#else 6039665Smsmith bytes += MALLOCALIGN; 6139665Smsmith#endif 6239665Smsmith 6339665Smsmith while ((res = znalloc(&MallocPool, bytes)) == NULL) { 6439665Smsmith int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; 6539665Smsmith char *base; 6639665Smsmith 6739665Smsmith if ((base = sbrk(incr)) == (char *)-1) 6839665Smsmith return(NULL); 6939665Smsmith zextendPool(&MallocPool, base, incr); 7039665Smsmith zfree(&MallocPool, base, incr); 7139665Smsmith } 7239665Smsmith#ifdef DMALLOCDEBUG 7339665Smsmith if (++MallocCount > MallocMax) 7439665Smsmith MallocMax = MallocCount; 7539665Smsmith#endif 7639665Smsmith#ifdef USEGUARD 7739665Smsmith res->ga_Magic = GAMAGIC; 7839665Smsmith#endif 7939665Smsmith res->ga_Bytes = bytes; 8039665Smsmith#ifdef USEENDGUARD 8139665Smsmith *((char *)res + bytes - 1) = -2; 8239665Smsmith#endif 8339665Smsmith return((char *)res + MALLOCALIGN); 8439665Smsmith} 8539665Smsmith 8639665Smsmithvoid 8739665Smsmithfree(void *ptr) 8839665Smsmith{ 8939665Smsmith size_t bytes; 9039665Smsmith 9139665Smsmith if (ptr != NULL) { 9239665Smsmith Guard *res = (void *)((char *)ptr - MALLOCALIGN); 9339665Smsmith 9439665Smsmith#ifdef USEGUARD 9539863Smsmith if (res->ga_Magic != GAMAGIC) 9639863Smsmith panic("free: guard1 fail @ %p", ptr); 9739665Smsmith res->ga_Magic = -1; 9839665Smsmith#endif 9939665Smsmith#ifdef USEENDGUARD 10039863Smsmith if (*((char *)res + res->ga_Bytes - 1) != -2) 10139863Smsmith panic("free: guard2 fail @ %p + %d", ptr, res->ga_Bytes - MALLOCALIGN); 10239665Smsmith *((char *)res + res->ga_Bytes - 1) = -1; 10339665Smsmith#endif 10439665Smsmith 10539665Smsmith bytes = res->ga_Bytes; 10639665Smsmith zfree(&MallocPool, res, bytes); 10739665Smsmith#ifdef DMALLOCDEBUG 10839665Smsmith --MallocCount; 10939665Smsmith#endif 11039665Smsmith } 11139665Smsmith} 11239665Smsmith 11339665Smsmith 11439665Smsmithvoid * 11539665Smsmithcalloc(size_t n1, size_t n2) 11639665Smsmith{ 11739665Smsmith iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2; 11839665Smsmith void *res; 11939665Smsmith 12039665Smsmith if ((res = malloc(bytes)) != NULL) { 12139665Smsmith bzero(res, bytes); 12239665Smsmith#ifdef DMALLOCDEBUG 12339665Smsmith if (++MallocCount > MallocMax) 12439665Smsmith MallocMax = MallocCount; 12539665Smsmith#endif 12639665Smsmith } 12739665Smsmith return(res); 12839665Smsmith} 12939665Smsmith 13039665Smsmith/* 13139665Smsmith * realloc() - I could be fancier here and free the old buffer before 13239665Smsmith * allocating the new one (saving potential fragmentation 13339665Smsmith * and potential buffer copies). But I don't bother. 13439665Smsmith */ 13539665Smsmith 13639665Smsmithvoid * 13739665Smsmithrealloc(void *ptr, size_t size) 13839665Smsmith{ 13939665Smsmith void *res; 14039665Smsmith size_t old; 14139665Smsmith 14239665Smsmith if ((res = malloc(size)) != NULL) { 14339665Smsmith if (ptr) { 14439665Smsmith old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; 14539665Smsmith if (old < size) 14639665Smsmith bcopy(ptr, res, old); 14739665Smsmith else 14839665Smsmith bcopy(ptr, res, size); 14939665Smsmith free(ptr); 15039665Smsmith } else { 15139665Smsmith#ifdef DMALLOCDEBUG 15239665Smsmith if (++MallocCount > MallocMax) 15339665Smsmith MallocMax = MallocCount; 15439665Smsmith#ifdef EXITSTATS 15539665Smsmith if (DidAtExit == 0) { 15639665Smsmith DidAtExit = 1; 15739665Smsmith atexit(mallocstats); 15839665Smsmith } 15939665Smsmith#endif 16039665Smsmith#endif 16139665Smsmith } 16239665Smsmith } 16339665Smsmith return(res); 16439665Smsmith} 16539665Smsmith 16639665Smsmithvoid * 16739665Smsmithreallocf(void *ptr, size_t size) 16839665Smsmith{ 16939665Smsmith void *res; 17039665Smsmith 17139665Smsmith if ((res = realloc(ptr, size)) == NULL) 17239665Smsmith free(ptr); 17339665Smsmith return(res); 17439665Smsmith} 17539665Smsmith 17639665Smsmith#ifdef DMALLOCDEBUG 17739665Smsmith 17839665Smsmithvoid 17939665Smsmithmallocstats(void) 18039665Smsmith{ 18139665Smsmith printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 18239665Smsmith#ifdef ZALLOCDEBUG 18339665Smsmith zallocstats(&MallocPool); 18439665Smsmith#endif 18539665Smsmith} 18639665Smsmith 18739665Smsmith#endif 18839665Smsmith 189