zalloc_malloc.c revision 40520
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 * 2940520Sdfr * $Id: zalloc_malloc.c,v 1.3 1998/10/01 17:35:08 msmith 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 5240520Sdfr#ifdef __alpha__ 5340520Sdfrvoid 5440520Sdfrfree_region(void *start, void *end) 5540520Sdfr{ 5640520Sdfr zextendPool(&MallocPool, start, (caddr_t)end - (caddr_t)start); 5740520Sdfr zfree(&MallocPool, start, (caddr_t)end - (caddr_t)start); 5840520Sdfr} 5940520Sdfr#endif 6040520Sdfr 6139665Smsmithvoid * 6239665Smsmithmalloc(size_t bytes) 6339665Smsmith{ 6439665Smsmith Guard *res; 6539665Smsmith 6639665Smsmith#ifdef USEENDGUARD 6739665Smsmith bytes += MALLOCALIGN + 1; 6839665Smsmith#else 6939665Smsmith bytes += MALLOCALIGN; 7039665Smsmith#endif 7139665Smsmith 7239665Smsmith while ((res = znalloc(&MallocPool, bytes)) == NULL) { 7339665Smsmith int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; 7439665Smsmith char *base; 7539665Smsmith 7639665Smsmith if ((base = sbrk(incr)) == (char *)-1) 7739665Smsmith return(NULL); 7839665Smsmith zextendPool(&MallocPool, base, incr); 7939665Smsmith zfree(&MallocPool, base, incr); 8039665Smsmith } 8139665Smsmith#ifdef DMALLOCDEBUG 8239665Smsmith if (++MallocCount > MallocMax) 8339665Smsmith MallocMax = MallocCount; 8439665Smsmith#endif 8539665Smsmith#ifdef USEGUARD 8639665Smsmith res->ga_Magic = GAMAGIC; 8739665Smsmith#endif 8839665Smsmith res->ga_Bytes = bytes; 8939665Smsmith#ifdef USEENDGUARD 9039665Smsmith *((char *)res + bytes - 1) = -2; 9139665Smsmith#endif 9239665Smsmith return((char *)res + MALLOCALIGN); 9339665Smsmith} 9439665Smsmith 9539665Smsmithvoid 9639665Smsmithfree(void *ptr) 9739665Smsmith{ 9839665Smsmith size_t bytes; 9939665Smsmith 10039665Smsmith if (ptr != NULL) { 10139665Smsmith Guard *res = (void *)((char *)ptr - MALLOCALIGN); 10239665Smsmith 10339665Smsmith#ifdef USEGUARD 10439863Smsmith if (res->ga_Magic != GAMAGIC) 10539863Smsmith panic("free: guard1 fail @ %p", ptr); 10639665Smsmith res->ga_Magic = -1; 10739665Smsmith#endif 10839665Smsmith#ifdef USEENDGUARD 10939863Smsmith if (*((char *)res + res->ga_Bytes - 1) != -2) 11039863Smsmith panic("free: guard2 fail @ %p + %d", ptr, res->ga_Bytes - MALLOCALIGN); 11139665Smsmith *((char *)res + res->ga_Bytes - 1) = -1; 11239665Smsmith#endif 11339665Smsmith 11439665Smsmith bytes = res->ga_Bytes; 11539665Smsmith zfree(&MallocPool, res, bytes); 11639665Smsmith#ifdef DMALLOCDEBUG 11739665Smsmith --MallocCount; 11839665Smsmith#endif 11939665Smsmith } 12039665Smsmith} 12139665Smsmith 12239665Smsmith 12339665Smsmithvoid * 12439665Smsmithcalloc(size_t n1, size_t n2) 12539665Smsmith{ 12639665Smsmith iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2; 12739665Smsmith void *res; 12839665Smsmith 12939665Smsmith if ((res = malloc(bytes)) != NULL) { 13039665Smsmith bzero(res, bytes); 13139665Smsmith#ifdef DMALLOCDEBUG 13239665Smsmith if (++MallocCount > MallocMax) 13339665Smsmith MallocMax = MallocCount; 13439665Smsmith#endif 13539665Smsmith } 13639665Smsmith return(res); 13739665Smsmith} 13839665Smsmith 13939665Smsmith/* 14039665Smsmith * realloc() - I could be fancier here and free the old buffer before 14139665Smsmith * allocating the new one (saving potential fragmentation 14239665Smsmith * and potential buffer copies). But I don't bother. 14339665Smsmith */ 14439665Smsmith 14539665Smsmithvoid * 14639665Smsmithrealloc(void *ptr, size_t size) 14739665Smsmith{ 14839665Smsmith void *res; 14939665Smsmith size_t old; 15039665Smsmith 15139665Smsmith if ((res = malloc(size)) != NULL) { 15239665Smsmith if (ptr) { 15339665Smsmith old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; 15439665Smsmith if (old < size) 15539665Smsmith bcopy(ptr, res, old); 15639665Smsmith else 15739665Smsmith bcopy(ptr, res, size); 15839665Smsmith free(ptr); 15939665Smsmith } else { 16039665Smsmith#ifdef DMALLOCDEBUG 16139665Smsmith if (++MallocCount > MallocMax) 16239665Smsmith MallocMax = MallocCount; 16339665Smsmith#ifdef EXITSTATS 16439665Smsmith if (DidAtExit == 0) { 16539665Smsmith DidAtExit = 1; 16639665Smsmith atexit(mallocstats); 16739665Smsmith } 16839665Smsmith#endif 16939665Smsmith#endif 17039665Smsmith } 17139665Smsmith } 17239665Smsmith return(res); 17339665Smsmith} 17439665Smsmith 17539665Smsmithvoid * 17639665Smsmithreallocf(void *ptr, size_t size) 17739665Smsmith{ 17839665Smsmith void *res; 17939665Smsmith 18039665Smsmith if ((res = realloc(ptr, size)) == NULL) 18139665Smsmith free(ptr); 18239665Smsmith return(res); 18339665Smsmith} 18439665Smsmith 18539665Smsmith#ifdef DMALLOCDEBUG 18639665Smsmith 18739665Smsmithvoid 18839665Smsmithmallocstats(void) 18939665Smsmith{ 19039665Smsmith printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 19139665Smsmith#ifdef ZALLOCDEBUG 19239665Smsmith zallocstats(&MallocPool); 19339665Smsmith#endif 19439665Smsmith} 19539665Smsmith 19639665Smsmith#endif 19739665Smsmith 198