zalloc_malloc.c revision 100394
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 100394 2002-07-20 04:18:20Z peter $"); 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 * 63100394SpeterMalloc(size_t bytes, const char *file, int line) 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 97100394SpeterFree(void *ptr, const char *file, int line) 9839665Smsmith{ 9939665Smsmith size_t bytes; 10039665Smsmith 10139665Smsmith if (ptr != NULL) { 10239665Smsmith Guard *res = (void *)((char *)ptr - MALLOCALIGN); 10339665Smsmith 104100394Speter if (file == NULL) 105100394Speter file = "unknown"; 10639665Smsmith#ifdef USEGUARD 107100394Speter if (res->ga_Magic == GAFREE) { 108100394Speter printf("free: duplicate free @ %p from %s:%d\n", ptr, file, line); 109100394Speter return; 110100394Speter } 11139863Smsmith if (res->ga_Magic != GAMAGIC) 112100394Speter panic("free: guard1 fail @ %p from %s:%p", ptr, file, line); 113100394Speter res->ga_Magic = GAFREE; 11439665Smsmith#endif 11539665Smsmith#ifdef USEENDGUARD 116100394Speter if (*((char *)res + res->ga_Bytes - 1) == -1) { 117100394Speter printf("free: duplicate2 free @ %p from %s:%d\n", ptr, file, line); 118100394Speter return; 119100394Speter } 12039863Smsmith if (*((char *)res + res->ga_Bytes - 1) != -2) 121100394Speter panic("free: guard2 fail @ %p + %d from %s:%d", ptr, res->ga_Bytes - MALLOCALIGN, file, line); 12239665Smsmith *((char *)res + res->ga_Bytes - 1) = -1; 12339665Smsmith#endif 12439665Smsmith 12539665Smsmith bytes = res->ga_Bytes; 12639665Smsmith zfree(&MallocPool, res, bytes); 12739665Smsmith#ifdef DMALLOCDEBUG 12839665Smsmith --MallocCount; 12939665Smsmith#endif 13039665Smsmith } 13139665Smsmith} 13239665Smsmith 13339665Smsmith 13439665Smsmithvoid * 135100394SpeterCalloc(size_t n1, size_t n2, const char *file, int line) 13639665Smsmith{ 13739665Smsmith iaddr_t bytes = (iaddr_t)n1 * (iaddr_t)n2; 13839665Smsmith void *res; 13939665Smsmith 140100394Speter if ((res = Malloc(bytes, file, line)) != NULL) { 14139665Smsmith bzero(res, bytes); 14239665Smsmith#ifdef DMALLOCDEBUG 14339665Smsmith if (++MallocCount > MallocMax) 14439665Smsmith MallocMax = MallocCount; 14539665Smsmith#endif 14639665Smsmith } 14739665Smsmith return(res); 14839665Smsmith} 14939665Smsmith 15039665Smsmith/* 15139665Smsmith * realloc() - I could be fancier here and free the old buffer before 15239665Smsmith * allocating the new one (saving potential fragmentation 15339665Smsmith * and potential buffer copies). But I don't bother. 15439665Smsmith */ 15539665Smsmith 15639665Smsmithvoid * 157100394SpeterRealloc(void *ptr, size_t size, const char *file, int line) 15839665Smsmith{ 15939665Smsmith void *res; 16039665Smsmith size_t old; 16139665Smsmith 162100394Speter if ((res = Malloc(size, file, line)) != NULL) { 16339665Smsmith if (ptr) { 16439665Smsmith old = *(size_t *)((char *)ptr - MALLOCALIGN) - MALLOCALIGN; 16539665Smsmith if (old < size) 16639665Smsmith bcopy(ptr, res, old); 16739665Smsmith else 16839665Smsmith bcopy(ptr, res, size); 169100394Speter Free(ptr, file, line); 17039665Smsmith } else { 17139665Smsmith#ifdef DMALLOCDEBUG 17239665Smsmith if (++MallocCount > MallocMax) 17339665Smsmith MallocMax = MallocCount; 17439665Smsmith#ifdef EXITSTATS 17539665Smsmith if (DidAtExit == 0) { 17639665Smsmith DidAtExit = 1; 17739665Smsmith atexit(mallocstats); 17839665Smsmith } 17939665Smsmith#endif 18039665Smsmith#endif 18139665Smsmith } 18239665Smsmith } 18339665Smsmith return(res); 18439665Smsmith} 18539665Smsmith 18639665Smsmithvoid * 187100394SpeterReallocf(void *ptr, size_t size, const char *file, int line) 18839665Smsmith{ 18939665Smsmith void *res; 19039665Smsmith 191100394Speter if ((res = Realloc(ptr, size, file, line)) == NULL) 192100394Speter Free(ptr, file, line); 19339665Smsmith return(res); 19439665Smsmith} 19539665Smsmith 19639665Smsmith#ifdef DMALLOCDEBUG 19739665Smsmith 19839665Smsmithvoid 19939665Smsmithmallocstats(void) 20039665Smsmith{ 20139665Smsmith printf("Active Allocations: %d/%d\n", MallocCount, MallocMax); 20239665Smsmith#ifdef ZALLOCDEBUG 20339665Smsmith zallocstats(&MallocPool); 20439665Smsmith#endif 20539665Smsmith} 20639665Smsmith 20739665Smsmith#endif 20839665Smsmith 209