zalloc_malloc.c revision 84221
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 */ 2939665Smsmith 3084221Sdillon#include <sys/cdefs.h> 3184221Sdillon__FBSDID("$FreeBSD: head/lib/libstand/zalloc_malloc.c 84221 2001-09-30 22:28:01Z dillon $"); 3284221Sdillon 3339665Smsmith/* 3439665Smsmith * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk 3539665Smsmith */ 3639665Smsmith 3739665Smsmith#include "zalloc_defs.h" 3839665Smsmith 3939863Smsmithstatic MemPool MallocPool; 4039665Smsmith 4139665Smsmith#ifdef DMALLOCDEBUG 4239665Smsmithstatic int MallocMax; 4339665Smsmithstatic int MallocCount; 4439665Smsmith 4539665Smsmithvoid mallocstats(void); 4639665Smsmith#endif 4739665Smsmith 4839672Sdfr#ifdef malloc 4939672Sdfr#undef malloc 5039672Sdfr#undef free 5139672Sdfr#endif 5239672Sdfr 5340520Sdfr#ifdef __alpha__ 5440520Sdfrvoid 5540520Sdfrfree_region(void *start, void *end) 5640520Sdfr{ 5740520Sdfr zextendPool(&MallocPool, start, (caddr_t)end - (caddr_t)start); 5840520Sdfr zfree(&MallocPool, start, (caddr_t)end - (caddr_t)start); 5940520Sdfr} 6040520Sdfr#endif 6140520Sdfr 6239665Smsmithvoid * 6339665Smsmithmalloc(size_t bytes) 6439665Smsmith{ 6539665Smsmith Guard *res; 6639665Smsmith 6739665Smsmith#ifdef USEENDGUARD 6839665Smsmith bytes += MALLOCALIGN + 1; 6939665Smsmith#else 7039665Smsmith bytes += MALLOCALIGN; 7139665Smsmith#endif 7239665Smsmith 7339665Smsmith while ((res = znalloc(&MallocPool, bytes)) == NULL) { 7439665Smsmith int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK; 7539665Smsmith char *base; 7639665Smsmith 7739665Smsmith if ((base = sbrk(incr)) == (char *)-1) 7839665Smsmith return(NULL); 7939665Smsmith zextendPool(&MallocPool, base, incr); 8039665Smsmith zfree(&MallocPool, base, incr); 8139665Smsmith } 8239665Smsmith#ifdef DMALLOCDEBUG 8339665Smsmith if (++MallocCount > MallocMax) 8439665Smsmith MallocMax = MallocCount; 8539665Smsmith#endif 8639665Smsmith#ifdef USEGUARD 8739665Smsmith res->ga_Magic = GAMAGIC; 8839665Smsmith#endif 8939665Smsmith res->ga_Bytes = bytes; 9039665Smsmith#ifdef USEENDGUARD 9139665Smsmith *((char *)res + bytes - 1) = -2; 9239665Smsmith#endif 9339665Smsmith return((char *)res + MALLOCALIGN); 9439665Smsmith} 9539665Smsmith 9639665Smsmithvoid 9739665Smsmithfree(void *ptr) 9839665Smsmith{ 9939665Smsmith size_t bytes; 10039665Smsmith 10139665Smsmith if (ptr != NULL) { 10239665Smsmith Guard *res = (void *)((char *)ptr - MALLOCALIGN); 10339665Smsmith 10439665Smsmith#ifdef USEGUARD 10539863Smsmith if (res->ga_Magic != GAMAGIC) 10639863Smsmith panic("free: guard1 fail @ %p", ptr); 10739665Smsmith res->ga_Magic = -1; 10839665Smsmith#endif 10939665Smsmith#ifdef USEENDGUARD 11039863Smsmith if (*((char *)res + res->ga_Bytes - 1) != -2) 11139863Smsmith panic("free: guard2 fail @ %p + %d", ptr, res->ga_Bytes - MALLOCALIGN); 11239665Smsmith *((char *)res + res->ga_Bytes - 1) = -1; 11339665Smsmith#endif 11439665Smsmith 11539665Smsmith bytes = res->ga_Bytes; 11639665Smsmith zfree(&MallocPool, res, bytes); 11739665Smsmith#ifdef DMALLOCDEBUG 11839665Smsmith --MallocCount; 11939665Smsmith#endif 12039665Smsmith } 12139665Smsmith} 12239665Smsmith 12339665Smsmith 12439665Smsmithvoid * 12539665Smsmithcalloc(size_t n1, size_t n2) 12639665Smsmith{ 12739665Smsmith iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2; 12839665Smsmith void *res; 12939665Smsmith 13039665Smsmith if ((res = malloc(bytes)) != NULL) { 13139665Smsmith bzero(res, bytes); 13239665Smsmith#ifdef DMALLOCDEBUG 13339665Smsmith if (++MallocCount > MallocMax) 13439665Smsmith MallocMax = MallocCount; 13539665Smsmith#endif 13639665Smsmith } 13739665Smsmith return(res); 13839665Smsmith} 13939665Smsmith 14039665Smsmith/* 14139665Smsmith * realloc() - I could be fancier here and free the old buffer before 14239665Smsmith * allocating the new one (saving potential fragmentation 14339665Smsmith * and potential buffer copies). But I don't bother. 14439665Smsmith */ 14539665Smsmith 14639665Smsmithvoid * 14739665Smsmithrealloc(void *ptr, size_t size) 14839665Smsmith{ 14939665Smsmith void *res; 15039665Smsmith size_t old; 15139665Smsmith 15239665Smsmith if ((res = malloc(size)) != NULL) { 15339665Smsmith if (ptr) { 15439665Smsmith old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; 15539665Smsmith if (old < size) 15639665Smsmith bcopy(ptr, res, old); 15739665Smsmith else 15839665Smsmith bcopy(ptr, res, size); 15939665Smsmith free(ptr); 16039665Smsmith } else { 16139665Smsmith#ifdef DMALLOCDEBUG 16239665Smsmith if (++MallocCount > MallocMax) 16339665Smsmith MallocMax = MallocCount; 16439665Smsmith#ifdef EXITSTATS 16539665Smsmith if (DidAtExit == 0) { 16639665Smsmith DidAtExit = 1; 16739665Smsmith atexit(mallocstats); 16839665Smsmith } 16939665Smsmith#endif 17039665Smsmith#endif 17139665Smsmith } 17239665Smsmith } 17339665Smsmith return(res); 17439665Smsmith} 17539665Smsmith 17639665Smsmithvoid * 17739665Smsmithreallocf(void *ptr, size_t size) 17839665Smsmith{ 17939665Smsmith void *res; 18039665Smsmith 18139665Smsmith if ((res = realloc(ptr, size)) == NULL) 18239665Smsmith free(ptr); 18339665Smsmith return(res); 18439665Smsmith} 18539665Smsmith 18639665Smsmith#ifdef DMALLOCDEBUG 18739665Smsmith 18839665Smsmithvoid 18939665Smsmithmallocstats(void) 19039665Smsmith{ 19139665Smsmith printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 19239665Smsmith#ifdef ZALLOCDEBUG 19339665Smsmith zallocstats(&MallocPool); 19439665Smsmith#endif 19539665Smsmith} 19639665Smsmith 19739665Smsmith#endif 19839665Smsmith 199