1998-03-07 19:24:35 +00:00
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/*-
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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2014-02-17 22:27:32 +00:00
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* 3. Neither the name of the University nor the names of its contributors
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1998-03-07 19:24:35 +00:00
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)malloc.c 5.11 (Berkeley) 2/23/91";*/
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1999-08-28 00:22:10 +00:00
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static char *rcsid = "$FreeBSD$";
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1998-03-07 19:24:35 +00:00
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#endif /* LIBC_SCCS and not lint */
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/*
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* malloc.c (Caltech) 2/21/82
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* Chris Kingsley, kingsley@cit-20.
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*
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* This is a very fast storage allocator. It allocates blocks of a small
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* number of different sizes, and keeps free lists of each size. Blocks that
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* don't exactly fit are passed up to the next larger size. In this
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* implementation, the available sizes are 2^n-4 (or 2^n-10) bytes long.
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* This is designed for use in a virtual memory environment.
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*/
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#include <sys/types.h>
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2010-08-17 09:05:39 +00:00
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#include <sys/sysctl.h>
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2000-12-09 09:35:55 +00:00
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#include <paths.h>
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2003-02-13 17:35:00 +00:00
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#include <stdarg.h>
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2003-08-22 02:22:59 +00:00
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#include <stddef.h>
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2003-02-13 17:35:00 +00:00
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#include <stdio.h>
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1998-03-07 19:24:35 +00:00
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <sys/mman.h>
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2011-08-24 20:05:13 +00:00
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#include "rtld_printf.h"
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1998-03-07 19:24:35 +00:00
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static void morecore();
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static int findbucket();
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/*
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* Pre-allocate mmap'ed pages
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*/
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#define NPOOLPAGES (32*1024/pagesz)
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static caddr_t pagepool_start, pagepool_end;
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static int morepages();
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/*
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* The overhead on a block is at least 4 bytes. When free, this space
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* contains a pointer to the next free block, and the bottom two bits must
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* be zero. When in use, the first byte is set to MAGIC, and the second
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* byte is the size index. The remaining bytes are for alignment.
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* If range checking is enabled then a second word holds the size of the
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* requested block, less 1, rounded up to a multiple of sizeof(RMAGIC).
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* The order of elements is critical: ov_magic must overlay the low order
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* bits of ov_next, and ov_magic can not be a valid ov_next bit pattern.
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*/
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union overhead {
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union overhead *ov_next; /* when free */
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struct {
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u_char ovu_magic; /* magic number */
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u_char ovu_index; /* bucket # */
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#ifdef RCHECK
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u_short ovu_rmagic; /* range magic number */
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u_int ovu_size; /* actual block size */
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#endif
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} ovu;
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#define ov_magic ovu.ovu_magic
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#define ov_index ovu.ovu_index
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#define ov_rmagic ovu.ovu_rmagic
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#define ov_size ovu.ovu_size
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};
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#define MAGIC 0xef /* magic # on accounting info */
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#define RMAGIC 0x5555 /* magic # on range info */
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#ifdef RCHECK
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#define RSLOP sizeof (u_short)
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#else
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#define RSLOP 0
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#endif
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/*
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* nextf[i] is the pointer to the next free block of size 2^(i+3). The
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* smallest allocatable block is 8 bytes. The overhead information
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* precedes the data area returned to the user.
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*/
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#define NBUCKETS 30
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static union overhead *nextf[NBUCKETS];
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static int pagesz; /* page size */
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static int pagebucket; /* page size bucket */
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#ifdef MSTATS
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/*
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* nmalloc[i] is the difference between the number of mallocs and frees
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* for a given block size.
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*/
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static u_int nmalloc[NBUCKETS];
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#include <stdio.h>
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#endif
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#if defined(MALLOC_DEBUG) || defined(RCHECK)
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#define ASSERT(p) if (!(p)) botch("p")
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#include <stdio.h>
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static void
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botch(s)
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char *s;
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{
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fprintf(stderr, "\r\nassertion botched: %s\r\n", s);
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(void) fflush(stderr); /* just in case user buffered it */
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abort();
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}
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#else
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#define ASSERT(p)
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#endif
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/* Debugging stuff */
|
2011-08-24 20:05:13 +00:00
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#define TRACE() rtld_printf("TRACE %s:%d\n", __FILE__, __LINE__)
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1998-03-07 19:24:35 +00:00
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2010-08-17 09:05:39 +00:00
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extern int pagesize;
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static int
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rtld_getpagesize(void)
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{
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int mib[2];
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size_t size;
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if (pagesize != 0)
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return (pagesize);
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mib[0] = CTL_HW;
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mib[1] = HW_PAGESIZE;
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size = sizeof(pagesize);
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if (sysctl(mib, 2, &pagesize, &size, NULL, 0) == -1)
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return (-1);
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return (pagesize);
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}
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1998-03-07 19:24:35 +00:00
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void *
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malloc(nbytes)
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size_t nbytes;
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{
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register union overhead *op;
|
1998-09-04 19:03:57 +00:00
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register int bucket;
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register long n;
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1998-03-07 19:24:35 +00:00
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register unsigned amt;
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/*
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* First time malloc is called, setup page size and
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* align break pointer so all data will be page aligned.
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*/
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if (pagesz == 0) {
|
2010-08-17 09:05:39 +00:00
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pagesz = n = rtld_getpagesize();
|
1998-03-07 19:24:35 +00:00
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if (morepages(NPOOLPAGES) == 0)
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return NULL;
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op = (union overhead *)(pagepool_start);
|
1998-09-04 19:03:57 +00:00
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n = n - sizeof (*op) - ((long)op & (n - 1));
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1998-03-07 19:24:35 +00:00
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if (n < 0)
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n += pagesz;
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if (n) {
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pagepool_start += n;
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}
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bucket = 0;
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amt = 8;
|
2003-05-04 00:56:00 +00:00
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while ((unsigned)pagesz > amt) {
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1998-03-07 19:24:35 +00:00
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amt <<= 1;
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bucket++;
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}
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pagebucket = bucket;
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}
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/*
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* Convert amount of memory requested into closest block size
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* stored in hash buckets which satisfies request.
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* Account for space used per block for accounting.
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*/
|
2003-05-04 00:56:00 +00:00
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if (nbytes <= (unsigned long)(n = pagesz - sizeof (*op) - RSLOP)) {
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1998-03-07 19:24:35 +00:00
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#ifndef RCHECK
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amt = 8; /* size of first bucket */
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bucket = 0;
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#else
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amt = 16; /* size of first bucket */
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bucket = 1;
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#endif
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n = -(sizeof (*op) + RSLOP);
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} else {
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amt = pagesz;
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bucket = pagebucket;
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}
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while (nbytes > amt + n) {
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amt <<= 1;
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if (amt == 0)
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return (NULL);
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bucket++;
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}
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/*
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* If nothing in hash bucket right now,
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* request more memory from the system.
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*/
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if ((op = nextf[bucket]) == NULL) {
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morecore(bucket);
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if ((op = nextf[bucket]) == NULL)
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return (NULL);
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}
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/* remove from linked list */
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nextf[bucket] = op->ov_next;
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op->ov_magic = MAGIC;
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op->ov_index = bucket;
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#ifdef MSTATS
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nmalloc[bucket]++;
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#endif
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#ifdef RCHECK
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/*
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* Record allocated size of block and
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* bound space with magic numbers.
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*/
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op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
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op->ov_rmagic = RMAGIC;
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*(u_short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
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#endif
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return ((char *)(op + 1));
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}
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|
2006-01-12 07:28:21 +00:00
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void *
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calloc(size_t num, size_t size)
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{
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void *ret;
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if (size != 0 && (num * size) / size != num) {
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/* size_t overflow. */
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return (NULL);
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}
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if ((ret = malloc(num * size)) != NULL)
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memset(ret, 0, num * size);
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return (ret);
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}
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1998-03-07 19:24:35 +00:00
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/*
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* Allocate more memory to the indicated bucket.
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*/
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static void
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morecore(bucket)
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int bucket;
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{
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register union overhead *op;
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register int sz; /* size of desired block */
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int amt; /* amount to allocate */
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int nblks; /* how many blocks we get */
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/*
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* sbrk_size <= 0 only for big, FLUFFY, requests (about
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* 2^30 bytes on a VAX, I think) or for a negative arg.
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*/
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sz = 1 << (bucket + 3);
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#ifdef MALLOC_DEBUG
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ASSERT(sz > 0);
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#else
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if (sz <= 0)
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return;
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#endif
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if (sz < pagesz) {
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amt = pagesz;
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nblks = amt / sz;
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} else {
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amt = sz + pagesz;
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nblks = 1;
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}
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if (amt > pagepool_end - pagepool_start)
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if (morepages(amt/pagesz + NPOOLPAGES) == 0)
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return;
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op = (union overhead *)pagepool_start;
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pagepool_start += amt;
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/*
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* Add new memory allocated to that on
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* free list for this hash bucket.
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*/
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nextf[bucket] = op;
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while (--nblks > 0) {
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op->ov_next = (union overhead *)((caddr_t)op + sz);
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op = (union overhead *)((caddr_t)op + sz);
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}
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}
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void
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free(cp)
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void *cp;
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{
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register int size;
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register union overhead *op;
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if (cp == NULL)
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return;
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op = (union overhead *)((caddr_t)cp - sizeof (union overhead));
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#ifdef MALLOC_DEBUG
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ASSERT(op->ov_magic == MAGIC); /* make sure it was in use */
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#else
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if (op->ov_magic != MAGIC)
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return; /* sanity */
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|
#endif
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#ifdef RCHECK
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ASSERT(op->ov_rmagic == RMAGIC);
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ASSERT(*(u_short *)((caddr_t)(op + 1) + op->ov_size) == RMAGIC);
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#endif
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size = op->ov_index;
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ASSERT(size < NBUCKETS);
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|
op->ov_next = nextf[size]; /* also clobbers ov_magic */
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nextf[size] = op;
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#ifdef MSTATS
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nmalloc[size]--;
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#endif
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}
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|
|
/*
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|
|
* When a program attempts "storage compaction" as mentioned in the
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|
|
* old malloc man page, it realloc's an already freed block. Usually
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|
* this is the last block it freed; occasionally it might be farther
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|
|
* back. We have to search all the free lists for the block in order
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|
|
* to determine its bucket: 1st we make one pass thru the lists
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|
|
* checking only the first block in each; if that fails we search
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|
|
* ``realloc_srchlen'' blocks in each list for a match (the variable
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|
|
* is extern so the caller can modify it). If that fails we just copy
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|
|
* however many bytes was given to realloc() and hope it's not huge.
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|
|
*/
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|
|
int realloc_srchlen = 4; /* 4 should be plenty, -1 =>'s whole list */
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|
void *
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|
|
realloc(cp, nbytes)
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|
|
void *cp;
|
|
|
|
size_t nbytes;
|
|
|
|
{
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|
|
|
register u_int onb;
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|
|
|
register int i;
|
|
|
|
union overhead *op;
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|
|
char *res;
|
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|
|
int was_alloced = 0;
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|
|
if (cp == NULL)
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|
|
return (malloc(nbytes));
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|
|
|
op = (union overhead *)((caddr_t)cp - sizeof (union overhead));
|
|
|
|
if (op->ov_magic == MAGIC) {
|
|
|
|
was_alloced++;
|
|
|
|
i = op->ov_index;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Already free, doing "compaction".
|
|
|
|
*
|
|
|
|
* Search for the old block of memory on the
|
|
|
|
* free list. First, check the most common
|
|
|
|
* case (last element free'd), then (this failing)
|
|
|
|
* the last ``realloc_srchlen'' items free'd.
|
|
|
|
* If all lookups fail, then assume the size of
|
|
|
|
* the memory block being realloc'd is the
|
|
|
|
* largest possible (so that all "nbytes" of new
|
|
|
|
* memory are copied into). Note that this could cause
|
|
|
|
* a memory fault if the old area was tiny, and the moon
|
|
|
|
* is gibbous. However, that is very unlikely.
|
|
|
|
*/
|
|
|
|
if ((i = findbucket(op, 1)) < 0 &&
|
|
|
|
(i = findbucket(op, realloc_srchlen)) < 0)
|
|
|
|
i = NBUCKETS;
|
|
|
|
}
|
|
|
|
onb = 1 << (i + 3);
|
2003-05-04 00:56:00 +00:00
|
|
|
if (onb < (u_int)pagesz)
|
1998-03-07 19:24:35 +00:00
|
|
|
onb -= sizeof (*op) + RSLOP;
|
|
|
|
else
|
|
|
|
onb += pagesz - sizeof (*op) - RSLOP;
|
|
|
|
/* avoid the copy if same size block */
|
|
|
|
if (was_alloced) {
|
|
|
|
if (i) {
|
|
|
|
i = 1 << (i + 2);
|
|
|
|
if (i < pagesz)
|
|
|
|
i -= sizeof (*op) + RSLOP;
|
|
|
|
else
|
|
|
|
i += pagesz - sizeof (*op) - RSLOP;
|
|
|
|
}
|
2003-05-04 00:56:00 +00:00
|
|
|
if (nbytes <= onb && nbytes > (size_t)i) {
|
1998-03-07 19:24:35 +00:00
|
|
|
#ifdef RCHECK
|
|
|
|
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
|
|
|
|
*(u_short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
|
|
|
|
#endif
|
|
|
|
return(cp);
|
|
|
|
} else
|
|
|
|
free(cp);
|
|
|
|
}
|
|
|
|
if ((res = malloc(nbytes)) == NULL)
|
|
|
|
return (NULL);
|
|
|
|
if (cp != res) /* common optimization if "compacting" */
|
|
|
|
bcopy(cp, res, (nbytes < onb) ? nbytes : onb);
|
|
|
|
return (res);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Search ``srchlen'' elements of each free list for a block whose
|
|
|
|
* header starts at ``freep''. If srchlen is -1 search the whole list.
|
|
|
|
* Return bucket number, or -1 if not found.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
findbucket(freep, srchlen)
|
|
|
|
union overhead *freep;
|
|
|
|
int srchlen;
|
|
|
|
{
|
|
|
|
register union overhead *p;
|
|
|
|
register int i, j;
|
|
|
|
|
|
|
|
for (i = 0; i < NBUCKETS; i++) {
|
|
|
|
j = 0;
|
|
|
|
for (p = nextf[i]; p && j != srchlen; p = p->ov_next) {
|
|
|
|
if (p == freep)
|
|
|
|
return (i);
|
|
|
|
j++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef MSTATS
|
|
|
|
/*
|
|
|
|
* mstats - print out statistics about malloc
|
|
|
|
*
|
|
|
|
* Prints two lines of numbers, one showing the length of the free list
|
|
|
|
* for each size category, the second showing the number of mallocs -
|
|
|
|
* frees for each size category.
|
|
|
|
*/
|
|
|
|
mstats(s)
|
|
|
|
char *s;
|
|
|
|
{
|
|
|
|
register int i, j;
|
|
|
|
register union overhead *p;
|
|
|
|
int totfree = 0,
|
|
|
|
totused = 0;
|
|
|
|
|
|
|
|
fprintf(stderr, "Memory allocation statistics %s\nfree:\t", s);
|
|
|
|
for (i = 0; i < NBUCKETS; i++) {
|
|
|
|
for (j = 0, p = nextf[i]; p; p = p->ov_next, j++)
|
|
|
|
;
|
|
|
|
fprintf(stderr, " %d", j);
|
|
|
|
totfree += j * (1 << (i + 3));
|
|
|
|
}
|
|
|
|
fprintf(stderr, "\nused:\t");
|
|
|
|
for (i = 0; i < NBUCKETS; i++) {
|
|
|
|
fprintf(stderr, " %d", nmalloc[i]);
|
|
|
|
totused += nmalloc[i] * (1 << (i + 3));
|
|
|
|
}
|
|
|
|
fprintf(stderr, "\n\tTotal in use: %d, total free: %d\n",
|
|
|
|
totused, totfree);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
morepages(n)
|
|
|
|
int n;
|
|
|
|
{
|
|
|
|
int fd = -1;
|
|
|
|
int offset;
|
|
|
|
|
|
|
|
if (pagepool_end - pagepool_start > pagesz) {
|
|
|
|
caddr_t addr = (caddr_t)
|
1998-09-04 19:03:57 +00:00
|
|
|
(((long)pagepool_start + pagesz - 1) & ~(pagesz - 1));
|
1998-03-07 19:24:35 +00:00
|
|
|
if (munmap(addr, pagepool_end - addr) != 0)
|
2011-08-24 20:05:13 +00:00
|
|
|
rtld_fdprintf(STDERR_FILENO, "morepages: munmap %p",
|
|
|
|
addr);
|
1998-03-07 19:24:35 +00:00
|
|
|
}
|
|
|
|
|
1998-09-04 19:03:57 +00:00
|
|
|
offset = (long)pagepool_start - ((long)pagepool_start & ~(pagesz - 1));
|
1998-03-07 19:24:35 +00:00
|
|
|
|
|
|
|
if ((pagepool_start = mmap(0, n * pagesz,
|
|
|
|
PROT_READ|PROT_WRITE,
|
|
|
|
MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
|
2011-08-24 20:05:13 +00:00
|
|
|
rtld_printf("Cannot map anonymous memory\n");
|
1998-03-07 19:24:35 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
pagepool_end = pagepool_start + n * pagesz;
|
|
|
|
pagepool_start += offset;
|
|
|
|
|
|
|
|
return n;
|
|
|
|
}
|