544 lines
14 KiB
C
544 lines
14 KiB
C
/*-
|
|
* Copyright (c) 1983, 1991 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)alloc.c 5.8 (Berkeley) 6/8/91";
|
|
static char rcsid[] = "$Header: /cvsroot/src/bin/csh/alloc.c,v 1.3 1993/03/23 00:23:56 cgd Exp $";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* tc.alloc.c from malloc.c (Caltech) 2/21/82
|
|
* Chris Kingsley, kingsley@cit-20.
|
|
*
|
|
* This is a very fast storage allocator. It allocates blocks of a small
|
|
* number of different sizes, and keeps free lists of each size. Blocks that
|
|
* don't exactly fit are passed up to the next larger size. In this
|
|
* implementation, the available sizes are 2^n-4 (or 2^n-12) bytes long.
|
|
* This is designed for use in a program that uses vast quantities of memory,
|
|
* but bombs when it runs out.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#if __STDC__
|
|
# include <stdarg.h>
|
|
#else
|
|
# include <varargs.h>
|
|
#endif
|
|
|
|
#include "csh.h"
|
|
#include "extern.h"
|
|
|
|
char *memtop = NULL; /* PWP: top of current memory */
|
|
char *membot = NULL; /* PWP: bottom of allocatable memory */
|
|
|
|
#ifndef SYSMALLOC
|
|
|
|
#undef RCHECK
|
|
#undef DEBUG
|
|
|
|
|
|
#ifndef NULL
|
|
#define NULL 0
|
|
#endif
|
|
|
|
|
|
/*
|
|
* The overhead on a block is at least 4 bytes. When free, this space
|
|
* contains a pointer to the next free block, and the bottom two bits must
|
|
* be zero. When in use, the first byte is set to MAGIC, and the second
|
|
* byte is the size index. The remaining bytes are for alignment.
|
|
* If range checking is enabled and the size of the block fits
|
|
* in two bytes, then the top two bytes hold the size of the requested block
|
|
* plus the range checking words, and the header word MINUS ONE.
|
|
*/
|
|
|
|
#define ROUNDUP 7
|
|
|
|
#define ALIGN(a) (((a) + ROUNDUP) & ~ROUNDUP)
|
|
|
|
union overhead {
|
|
union overhead *ov_next; /* when free */
|
|
struct {
|
|
u_char ovu_magic; /* magic number */
|
|
u_char ovu_index; /* bucket # */
|
|
#ifdef RCHECK
|
|
u_short ovu_size; /* actual block size */
|
|
u_int ovu_rmagic; /* range magic number */
|
|
#endif
|
|
} ovu;
|
|
#define ov_magic ovu.ovu_magic
|
|
#define ov_index ovu.ovu_index
|
|
#define ov_size ovu.ovu_size
|
|
#define ov_rmagic ovu.ovu_rmagic
|
|
};
|
|
|
|
#define MAGIC 0xfd /* magic # on accounting info */
|
|
#define RMAGIC 0x55555555 /* magic # on range info */
|
|
#ifdef RCHECK
|
|
#define RSLOP sizeof (u_int)
|
|
#else
|
|
#define RSLOP 0
|
|
#endif
|
|
|
|
/*
|
|
* nextf[i] is the pointer to the next free block of size 2^(i+3). The
|
|
* smallest allocatable block is 8 bytes. The overhead information
|
|
* precedes the data area returned to the user.
|
|
*/
|
|
#define NBUCKETS 30
|
|
static union overhead *nextf[NBUCKETS];
|
|
|
|
static int findbucket __P((union overhead *, int));
|
|
static void morecore __P((int));
|
|
|
|
/*
|
|
* nmalloc[i] is the difference between the number of mallocs and frees
|
|
* for a given block size.
|
|
*/
|
|
static u_int nmalloc[NBUCKETS];
|
|
|
|
|
|
#ifdef DEBUG
|
|
#define CHECK(a, str, p) \
|
|
if (a) { \
|
|
xprintf(str, p); \
|
|
xprintf("memtop = %lx membot = %lx.\n", memtop, membot); \
|
|
abort(); \
|
|
} \
|
|
else
|
|
#else
|
|
#define CHECK(a, str, p) \
|
|
if (a) { \
|
|
xprintf(str, p); \
|
|
xprintf("memtop = %lx membot = %lx.\n", memtop, membot); \
|
|
return; \
|
|
} \
|
|
else
|
|
#endif
|
|
|
|
ptr_t
|
|
malloc(nbytes)
|
|
register size_t nbytes;
|
|
{
|
|
#ifndef lint
|
|
register union overhead *p;
|
|
register int bucket = 0;
|
|
register unsigned shiftr;
|
|
|
|
/*
|
|
* Convert amount of memory requested into closest block size stored in
|
|
* hash buckets which satisfies request. Account for space used per block
|
|
* for accounting.
|
|
*/
|
|
nbytes = ALIGN(ALIGN(sizeof(union overhead)) + nbytes + RSLOP);
|
|
shiftr = (nbytes - 1) >> 2;
|
|
|
|
/* apart from this loop, this is O(1) */
|
|
while (shiftr >>= 1)
|
|
bucket++;
|
|
/*
|
|
* If nothing in hash bucket right now, request more memory from the
|
|
* system.
|
|
*/
|
|
if (nextf[bucket] == NULL)
|
|
morecore(bucket);
|
|
if ((p = (union overhead *) nextf[bucket]) == NULL) {
|
|
child++;
|
|
#ifndef DEBUG
|
|
stderror(ERR_NOMEM);
|
|
#else
|
|
showall();
|
|
xprintf("nbytes=%d: Out of memory\n", nbytes);
|
|
abort();
|
|
#endif
|
|
/* fool lint */
|
|
return ((ptr_t) 0);
|
|
}
|
|
/* remove from linked list */
|
|
nextf[bucket] = nextf[bucket]->ov_next;
|
|
p->ov_magic = MAGIC;
|
|
p->ov_index = bucket;
|
|
nmalloc[bucket]++;
|
|
#ifdef RCHECK
|
|
/*
|
|
* Record allocated size of block and bound space with magic numbers.
|
|
*/
|
|
if (nbytes <= 0x10000)
|
|
p->ov_size = nbytes - 1;
|
|
p->ov_rmagic = RMAGIC;
|
|
*((u_int *) (((caddr_t) p) + nbytes - RSLOP)) = RMAGIC;
|
|
#endif
|
|
return ((ptr_t) (((caddr_t) p) + ALIGN(sizeof(union overhead))));
|
|
#else
|
|
if (nbytes)
|
|
return ((ptr_t) 0);
|
|
else
|
|
return ((ptr_t) 0);
|
|
#endif /* !lint */
|
|
}
|
|
|
|
#ifndef lint
|
|
/*
|
|
* Allocate more memory to the indicated bucket.
|
|
*/
|
|
static void
|
|
morecore(bucket)
|
|
register int bucket;
|
|
{
|
|
register union overhead *op;
|
|
register int rnu; /* 2^rnu bytes will be requested */
|
|
register int nblks; /* become nblks blocks of the desired size */
|
|
register int siz;
|
|
|
|
if (nextf[bucket])
|
|
return;
|
|
/*
|
|
* Insure memory is allocated on a page boundary. Should make getpageize
|
|
* call?
|
|
*/
|
|
op = (union overhead *) sbrk(0);
|
|
memtop = (char *) op;
|
|
if (membot == NULL)
|
|
membot = memtop;
|
|
if ((int) op & 0x3ff) {
|
|
memtop = (char *) sbrk(1024 - ((int) op & 0x3ff));
|
|
memtop += 1024 - ((int) op & 0x3ff);
|
|
}
|
|
|
|
/* take 2k unless the block is bigger than that */
|
|
rnu = (bucket <= 8) ? 11 : bucket + 3;
|
|
nblks = 1 << (rnu - (bucket + 3)); /* how many blocks to get */
|
|
if (rnu < bucket)
|
|
rnu = bucket;
|
|
memtop = (char *) sbrk(1 << rnu); /* PWP */
|
|
op = (union overhead *) memtop;
|
|
memtop += 1 << rnu;
|
|
/* no more room! */
|
|
if ((int) op == -1)
|
|
return;
|
|
/*
|
|
* Round up to minimum allocation size boundary and deduct from block count
|
|
* to reflect.
|
|
*/
|
|
if (((u_int) op) & ROUNDUP) {
|
|
op = (union overhead *) (((u_int) op + (ROUNDUP + 1)) & ~ROUNDUP);
|
|
nblks--;
|
|
}
|
|
/*
|
|
* Add new memory allocated to that on free list for this hash bucket.
|
|
*/
|
|
nextf[bucket] = op;
|
|
siz = 1 << (bucket + 3);
|
|
while (--nblks > 0) {
|
|
op->ov_next = (union overhead *) (((caddr_t) op) + siz);
|
|
op = (union overhead *) (((caddr_t) op) + siz);
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef sun
|
|
int
|
|
#else
|
|
void
|
|
#endif
|
|
free(cp)
|
|
ptr_t cp;
|
|
{
|
|
#ifndef lint
|
|
register int size;
|
|
register union overhead *op;
|
|
|
|
if (cp == NULL)
|
|
return;
|
|
CHECK(!memtop || !membot, "free(%lx) called before any allocations.", cp);
|
|
CHECK(cp > (ptr_t) memtop, "free(%lx) above top of memory.", cp);
|
|
CHECK(cp < (ptr_t) membot, "free(%lx) above top of memory.", cp);
|
|
op = (union overhead *) (((caddr_t) cp) - ALIGN(sizeof(union overhead)));
|
|
CHECK(op->ov_magic != MAGIC, "free(%lx) bad block.", cp);
|
|
|
|
#ifdef RCHECK
|
|
if (op->ov_index <= 13)
|
|
CHECK(*(u_int *) ((caddr_t) op + op->ov_size + 1 - RSLOP) != RMAGIC,
|
|
"free(%lx) bad range check.", cp);
|
|
#endif
|
|
CHECK(op->ov_index >= NBUCKETS, "free(%lx) bad block index.", cp);
|
|
size = op->ov_index;
|
|
op->ov_next = nextf[size];
|
|
nextf[size] = op;
|
|
|
|
nmalloc[size]--;
|
|
|
|
#else
|
|
if (cp == NULL)
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
ptr_t
|
|
calloc(i, j)
|
|
size_t i, j;
|
|
{
|
|
#ifndef lint
|
|
register char *cp, *scp;
|
|
|
|
i *= j;
|
|
scp = cp = (char *) xmalloc((size_t) i);
|
|
if (i != 0)
|
|
do
|
|
*cp++ = 0;
|
|
while (--i);
|
|
|
|
return (scp);
|
|
#else
|
|
if (i && j)
|
|
return ((ptr_t) 0);
|
|
else
|
|
return ((ptr_t) 0);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* When a program attempts "storage compaction" as mentioned in the
|
|
* old malloc man page, it realloc's an already freed block. Usually
|
|
* this is the last block it freed; occasionally it might be farther
|
|
* back. We have to search all the free lists for the block in order
|
|
* to determine its bucket: 1st we make one pass thru the lists
|
|
* checking only the first block in each; if that fails we search
|
|
* ``realloc_srchlen'' blocks in each list for a match (the variable
|
|
* is extern so the caller can modify it). If that fails we just copy
|
|
* however many bytes was given to realloc() and hope it's not huge.
|
|
*/
|
|
#ifndef lint
|
|
int realloc_srchlen = 4; /* 4 should be plenty, -1 =>'s whole list */
|
|
|
|
#endif /* lint */
|
|
|
|
ptr_t
|
|
realloc(cp, nbytes)
|
|
ptr_t cp;
|
|
size_t nbytes;
|
|
{
|
|
#ifndef lint
|
|
register u_int onb;
|
|
union overhead *op;
|
|
char *res;
|
|
register int i;
|
|
int was_alloced = 0;
|
|
|
|
if (cp == NULL)
|
|
return (malloc(nbytes));
|
|
op = (union overhead *) (((caddr_t) cp) - ALIGN(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 smallest
|
|
* possible.
|
|
*/
|
|
if ((i = findbucket(op, 1)) < 0 &&
|
|
(i = findbucket(op, realloc_srchlen)) < 0)
|
|
i = 0;
|
|
|
|
onb = ALIGN(nbytes + ALIGN(sizeof(union overhead)) + RSLOP);
|
|
|
|
/* avoid the copy if same size block */
|
|
if (was_alloced && (onb < (1 << (i + 3))) && (onb >= (1 << (i + 2))))
|
|
return ((ptr_t) cp);
|
|
if ((res = malloc(nbytes)) == NULL)
|
|
return ((ptr_t) 0);
|
|
if (cp != res) /* common optimization */
|
|
bcopy(cp, res, nbytes);
|
|
if (was_alloced)
|
|
free(cp);
|
|
return (res);
|
|
#else
|
|
if (cp && nbytes)
|
|
return ((ptr_t) 0);
|
|
else
|
|
return ((ptr_t) 0);
|
|
#endif /* !lint */
|
|
}
|
|
|
|
|
|
|
|
#ifndef lint
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
#else /* SYSMALLOC */
|
|
|
|
/**
|
|
** ``Protected versions'' of malloc, realloc, calloc, and free
|
|
**
|
|
** On many systems:
|
|
**
|
|
** 1. malloc(0) is bad
|
|
** 2. free(0) is bad
|
|
** 3. realloc(0, n) is bad
|
|
** 4. realloc(n, 0) is bad
|
|
**
|
|
** Also we call our error routine if we run out of memory.
|
|
**/
|
|
char *
|
|
Malloc(n)
|
|
size_t n;
|
|
{
|
|
ptr_t ptr;
|
|
|
|
n = n ? n : 1;
|
|
|
|
if ((ptr = malloc(n)) == (ptr_t) 0) {
|
|
child++;
|
|
stderror(ERR_NOMEM);
|
|
}
|
|
return ((char *) ptr);
|
|
}
|
|
|
|
char *
|
|
Realloc(p, n)
|
|
ptr_t p;
|
|
size_t n;
|
|
{
|
|
ptr_t ptr;
|
|
|
|
n = n ? n : 1;
|
|
if ((ptr = (p ? realloc(p, n) : malloc(n))) == (ptr_t) 0) {
|
|
child++;
|
|
stderror(ERR_NOMEM);
|
|
}
|
|
return ((char *) ptr);
|
|
}
|
|
|
|
char *
|
|
Calloc(s, n)
|
|
size_t s, n;
|
|
{
|
|
char *sptr;
|
|
ptr_t ptr;
|
|
|
|
n *= s;
|
|
n = n ? n : 1;
|
|
if ((ptr = malloc(n)) == (ptr_t) 0) {
|
|
child++;
|
|
stderror(ERR_NOMEM);
|
|
}
|
|
|
|
sptr = (char *) ptr;
|
|
if (n != 0)
|
|
do
|
|
*sptr++ = 0;
|
|
while (--n);
|
|
|
|
return ((char *) ptr);
|
|
}
|
|
|
|
void
|
|
Free(p)
|
|
ptr_t p;
|
|
{
|
|
if (p)
|
|
free(p);
|
|
}
|
|
|
|
#endif /* SYSMALLOC */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
void
|
|
showall()
|
|
{
|
|
#ifndef SYSMALLOC
|
|
register int i, j;
|
|
register union overhead *p;
|
|
int totfree = 0, totused = 0;
|
|
|
|
xprintf("csh current memory allocation:\nfree:\t");
|
|
for (i = 0; i < NBUCKETS; i++) {
|
|
for (j = 0, p = nextf[i]; p; p = p->ov_next, j++);
|
|
xprintf(" %4d", j);
|
|
totfree += j * (1 << (i + 3));
|
|
}
|
|
xprintf("\nused:\t");
|
|
for (i = 0; i < NBUCKETS; i++) {
|
|
xprintf(" %4d", nmalloc[i]);
|
|
totused += nmalloc[i] * (1 << (i + 3));
|
|
}
|
|
xprintf("\n\tTotal in use: %d, total free: %d\n",
|
|
totused, totfree);
|
|
xprintf("\tAllocated memory from 0x%lx to 0x%lx. Real top at 0x%lx\n",
|
|
membot, memtop, (char *) sbrk(0));
|
|
#else
|
|
xprintf("Allocated memory from 0x%lx to 0x%lx (%ld).\n",
|
|
membot, memtop = (char *) sbrk(0), memtop - membot);
|
|
#endif /* SYSMALLOC */
|
|
}
|