544 lines
14 KiB
C
544 lines
14 KiB
C
/*-
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* Copyright (c) 1983, 1991 The 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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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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#ifndef lint
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/*static char sccsid[] = "from: @(#)alloc.c 5.8 (Berkeley) 6/8/91";*/
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static char rcsid[] = "$Id: alloc.c,v 1.4 1993/08/01 19:00:53 mycroft Exp $";
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#endif /* not lint */
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/*
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* tc.alloc.c from 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-12) bytes long.
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* This is designed for use in a program that uses vast quantities of memory,
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* but bombs when it runs out.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#if __STDC__
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# include <stdarg.h>
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#else
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# include <varargs.h>
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#endif
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#include "csh.h"
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#include "extern.h"
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char *memtop = NULL; /* PWP: top of current memory */
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char *membot = NULL; /* PWP: bottom of allocatable memory */
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#ifndef SYSMALLOC
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#undef RCHECK
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#undef DEBUG
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#ifndef NULL
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#define NULL 0
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#endif
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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 and the size of the block fits
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* in two bytes, then the top two bytes hold the size of the requested block
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* plus the range checking words, and the header word MINUS ONE.
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*/
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#define ROUNDUP 7
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#define ALIGN(a) (((a) + ROUNDUP) & ~ROUNDUP)
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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_size; /* actual block size */
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u_int ovu_rmagic; /* range magic number */
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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_size ovu.ovu_size
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#define ov_rmagic ovu.ovu_rmagic
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};
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#define MAGIC 0xfd /* magic # on accounting info */
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#define RMAGIC 0x55555555 /* magic # on range info */
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#ifdef RCHECK
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#define RSLOP sizeof (u_int)
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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 findbucket __P((union overhead *, int));
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static void morecore __P((int));
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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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#ifdef DEBUG
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#define CHECK(a, str, p) \
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if (a) { \
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xprintf(str, p); \
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xprintf("memtop = %lx membot = %lx.\n", memtop, membot); \
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abort(); \
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} \
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else
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#else
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#define CHECK(a, str, p) \
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if (a) { \
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xprintf(str, p); \
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xprintf("memtop = %lx membot = %lx.\n", memtop, membot); \
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return; \
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} \
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else
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#endif
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ptr_t
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malloc(nbytes)
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register size_t nbytes;
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{
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#ifndef lint
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register union overhead *p;
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register int bucket = 0;
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register unsigned shiftr;
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/*
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* Convert amount of memory requested into closest block size stored in
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* hash buckets which satisfies request. Account for space used per block
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* for accounting.
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*/
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nbytes = ALIGN(ALIGN(sizeof(union overhead)) + nbytes + RSLOP);
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shiftr = (nbytes - 1) >> 2;
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/* apart from this loop, this is O(1) */
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while (shiftr >>= 1)
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bucket++;
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/*
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* If nothing in hash bucket right now, request more memory from the
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* system.
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*/
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if (nextf[bucket] == NULL)
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morecore(bucket);
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if ((p = (union overhead *) nextf[bucket]) == NULL) {
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child++;
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#ifndef DEBUG
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stderror(ERR_NOMEM);
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#else
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showall();
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xprintf("nbytes=%d: Out of memory\n", nbytes);
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abort();
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#endif
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/* fool lint */
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return ((ptr_t) 0);
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}
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/* remove from linked list */
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nextf[bucket] = nextf[bucket]->ov_next;
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p->ov_magic = MAGIC;
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p->ov_index = bucket;
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nmalloc[bucket]++;
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#ifdef RCHECK
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/*
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* Record allocated size of block and bound space with magic numbers.
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*/
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if (nbytes <= 0x10000)
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p->ov_size = nbytes - 1;
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p->ov_rmagic = RMAGIC;
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*((u_int *) (((caddr_t) p) + nbytes - RSLOP)) = RMAGIC;
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#endif
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return ((ptr_t) (((caddr_t) p) + ALIGN(sizeof(union overhead))));
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#else
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if (nbytes)
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return ((ptr_t) 0);
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else
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return ((ptr_t) 0);
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#endif /* !lint */
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}
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#ifndef lint
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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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register int bucket;
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{
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register union overhead *op;
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register int rnu; /* 2^rnu bytes will be requested */
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register int nblks; /* become nblks blocks of the desired size */
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register int siz;
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if (nextf[bucket])
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return;
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/*
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* Insure memory is allocated on a page boundary. Should make getpageize
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* call?
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*/
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op = (union overhead *) sbrk(0);
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memtop = (char *) op;
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if (membot == NULL)
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membot = memtop;
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if ((int) op & 0x3ff) {
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memtop = (char *) sbrk(1024 - ((int) op & 0x3ff));
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memtop += 1024 - ((int) op & 0x3ff);
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}
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/* take 2k unless the block is bigger than that */
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rnu = (bucket <= 8) ? 11 : bucket + 3;
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nblks = 1 << (rnu - (bucket + 3)); /* how many blocks to get */
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if (rnu < bucket)
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rnu = bucket;
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memtop = (char *) sbrk(1 << rnu); /* PWP */
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op = (union overhead *) memtop;
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memtop += 1 << rnu;
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/* no more room! */
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if ((int) op == -1)
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return;
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/*
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* Round up to minimum allocation size boundary and deduct from block count
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* to reflect.
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*/
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if (((u_int) op) & ROUNDUP) {
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op = (union overhead *) (((u_int) op + (ROUNDUP + 1)) & ~ROUNDUP);
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nblks--;
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}
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/*
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* Add new memory allocated to that on free list for this hash bucket.
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*/
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nextf[bucket] = op;
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siz = 1 << (bucket + 3);
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while (--nblks > 0) {
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op->ov_next = (union overhead *) (((caddr_t) op) + siz);
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op = (union overhead *) (((caddr_t) op) + siz);
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}
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}
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#endif
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#ifdef sun
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int
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#else
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void
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#endif
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free(cp)
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ptr_t cp;
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{
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#ifndef lint
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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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CHECK(!memtop || !membot, "free(%lx) called before any allocations.", cp);
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CHECK(cp > (ptr_t) memtop, "free(%lx) above top of memory.", cp);
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CHECK(cp < (ptr_t) membot, "free(%lx) above top of memory.", cp);
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op = (union overhead *) (((caddr_t) cp) - ALIGN(sizeof(union overhead)));
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CHECK(op->ov_magic != MAGIC, "free(%lx) bad block.", cp);
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#ifdef RCHECK
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if (op->ov_index <= 13)
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CHECK(*(u_int *) ((caddr_t) op + op->ov_size + 1 - RSLOP) != RMAGIC,
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"free(%lx) bad range check.", cp);
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#endif
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CHECK(op->ov_index >= NBUCKETS, "free(%lx) bad block index.", cp);
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size = op->ov_index;
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op->ov_next = nextf[size];
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nextf[size] = op;
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nmalloc[size]--;
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#else
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if (cp == NULL)
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return;
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#endif
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}
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ptr_t
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calloc(i, j)
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size_t i, j;
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{
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#ifndef lint
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register char *cp, *scp;
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i *= j;
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scp = cp = (char *) xmalloc((size_t) i);
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if (i != 0)
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do
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*cp++ = 0;
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while (--i);
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return (scp);
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#else
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if (i && j)
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return ((ptr_t) 0);
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else
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return ((ptr_t) 0);
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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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#ifndef lint
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int realloc_srchlen = 4; /* 4 should be plenty, -1 =>'s whole list */
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#endif /* lint */
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ptr_t
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realloc(cp, nbytes)
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ptr_t cp;
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size_t nbytes;
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{
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#ifndef lint
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register u_int onb;
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union overhead *op;
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char *res;
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register int i;
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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) - ALIGN(sizeof(union overhead)));
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if (op->ov_magic == MAGIC) {
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was_alloced++;
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i = op->ov_index;
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}
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else
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/*
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* Already free, doing "compaction".
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*
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* Search for the old block of memory on the free list. First, check the
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* most common case (last element free'd), then (this failing) the last
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* ``realloc_srchlen'' items free'd. If all lookups fail, then assume
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* the size of the memory block being realloc'd is the smallest
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* possible.
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*/
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if ((i = findbucket(op, 1)) < 0 &&
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(i = findbucket(op, realloc_srchlen)) < 0)
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i = 0;
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onb = ALIGN(nbytes + ALIGN(sizeof(union overhead)) + RSLOP);
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/* avoid the copy if same size block */
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if (was_alloced && (onb < (1 << (i + 3))) && (onb >= (1 << (i + 2))))
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return ((ptr_t) cp);
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if ((res = malloc(nbytes)) == NULL)
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return ((ptr_t) 0);
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if (cp != res) /* common optimization */
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bcopy(cp, res, nbytes);
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if (was_alloced)
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free(cp);
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return (res);
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#else
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if (cp && nbytes)
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return ((ptr_t) 0);
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else
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return ((ptr_t) 0);
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#endif /* !lint */
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}
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#ifndef lint
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/*
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* Search ``srchlen'' elements of each free list for a block whose
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* header starts at ``freep''. If srchlen is -1 search the whole list.
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* Return bucket number, or -1 if not found.
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*/
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static int
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findbucket(freep, srchlen)
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union overhead *freep;
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int srchlen;
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{
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register union overhead *p;
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register int i, j;
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for (i = 0; i < NBUCKETS; i++) {
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j = 0;
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for (p = nextf[i]; p && j != srchlen; p = p->ov_next) {
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if (p == freep)
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return (i);
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j++;
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}
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}
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return (-1);
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}
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#endif
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#else /* SYSMALLOC */
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/**
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** ``Protected versions'' of malloc, realloc, calloc, and free
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**
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** On many systems:
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**
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** 1. malloc(0) is bad
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** 2. free(0) is bad
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** 3. realloc(0, n) is bad
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** 4. realloc(n, 0) is bad
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**
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** Also we call our error routine if we run out of memory.
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**/
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char *
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Malloc(n)
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size_t n;
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{
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ptr_t ptr;
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n = n ? n : 1;
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if ((ptr = malloc(n)) == (ptr_t) 0) {
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child++;
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stderror(ERR_NOMEM);
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}
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return ((char *) ptr);
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}
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char *
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Realloc(p, n)
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ptr_t p;
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size_t n;
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{
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ptr_t ptr;
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n = n ? n : 1;
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if ((ptr = (p ? realloc(p, n) : malloc(n))) == (ptr_t) 0) {
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child++;
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stderror(ERR_NOMEM);
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}
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return ((char *) ptr);
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}
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char *
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Calloc(s, n)
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size_t s, n;
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{
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char *sptr;
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ptr_t ptr;
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n *= s;
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n = n ? n : 1;
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if ((ptr = malloc(n)) == (ptr_t) 0) {
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child++;
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stderror(ERR_NOMEM);
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}
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sptr = (char *) ptr;
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if (n != 0)
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do
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*sptr++ = 0;
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while (--n);
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return ((char *) ptr);
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}
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void
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Free(p)
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ptr_t p;
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{
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if (p)
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free(p);
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}
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#endif /* SYSMALLOC */
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/*
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* mstats - print out statistics about malloc
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*
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* Prints two lines of numbers, one showing the length of the free list
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* for each size category, the second showing the number of mallocs -
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* frees for each size category.
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*/
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void
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showall()
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{
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#ifndef SYSMALLOC
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register int i, j;
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register union overhead *p;
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int totfree = 0, totused = 0;
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xprintf("csh current memory allocation:\nfree:\t");
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for (i = 0; i < NBUCKETS; i++) {
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for (j = 0, p = nextf[i]; p; p = p->ov_next, j++);
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xprintf(" %4d", j);
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totfree += j * (1 << (i + 3));
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}
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xprintf("\nused:\t");
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for (i = 0; i < NBUCKETS; i++) {
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xprintf(" %4d", nmalloc[i]);
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totused += nmalloc[i] * (1 << (i + 3));
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}
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xprintf("\n\tTotal in use: %d, total free: %d\n",
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totused, totfree);
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xprintf("\tAllocated memory from 0x%lx to 0x%lx. Real top at 0x%lx\n",
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membot, memtop, (char *) sbrk(0));
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#else
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xprintf("Allocated memory from 0x%lx to 0x%lx (%ld).\n",
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membot, memtop = (char *) sbrk(0), memtop - membot);
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#endif /* SYSMALLOC */
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}
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