-/* $Header: malloc.c,v 1.0 87/12/18 13:05:35 root Exp $
+/* malloc.c
*
- * $Log: malloc.c,v $
- * Revision 1.0 87/12/18 13:05:35 root
- * Initial revision
- *
*/
#ifndef lint
-static char sccsid[] = "@(#)malloc.c 4.3 (Berkeley) 9/16/83";
-#endif
-#include <stdio.h>
-
+#ifdef DEBUGGING
#define RCHECK
+#endif
/*
* malloc.c (Caltech) 2/21/82
* Chris Kingsley, kingsley@cit-20.
* but bombs when it runs out.
*/
-#include <sys/types.h>
+#include "EXTERN.h"
+#include "perl.h"
+
+/* I don't much care whether these are defined in sys/types.h--LAW */
-#define NULL 0
+#define u_char unsigned char
+#define u_int unsigned int
+#define u_short unsigned short
/*
* The overhead on a block is at least 4 bytes. When free, this space
*/
union overhead {
union overhead *ov_next; /* when free */
+#if MEM_ALIGNBYTES > 4
+ double strut; /* alignment problems */
+#endif
struct {
u_char ovu_magic; /* magic number */
u_char ovu_index; /* bucket # */
#define ov_rmagic ovu.ovu_rmagic
};
+#ifdef debug
+static void botch _((char *s));
+#endif
+static void morecore _((int bucket));
+static int findbucket _((union overhead *freep, int srchlen));
+
#define MAGIC 0xff /* magic # on accounting info */
#define RMAGIC 0x55555555 /* magic # on range info */
#ifdef RCHECK
static union overhead *nextf[NBUCKETS];
extern char *sbrk();
-#ifdef MSTATS
+#ifdef DEBUGGING_MSTATS
/*
* nmalloc[i] is the difference between the number of mallocs and frees
* for a given block size.
#ifdef debug
#define ASSERT(p) if (!(p)) botch("p"); else
-static
+static void
botch(s)
char *s;
{
#define ASSERT(p)
#endif
-char *
+Malloc_t
malloc(nbytes)
- register unsigned nbytes;
+ register MEM_SIZE nbytes;
{
register union overhead *p;
register int bucket = 0;
- register unsigned shiftr;
+ register MEM_SIZE shiftr;
+
+#ifdef safemalloc
+#ifdef DEBUGGING
+ MEM_SIZE size = nbytes;
+#endif
+
+#ifdef MSDOS
+ if (nbytes > 0xffff) {
+ fprintf(stderr, "Allocation too large: %lx\n", (long)nbytes);
+ my_exit(1);
+ }
+#endif /* MSDOS */
+#ifdef DEBUGGING
+ if ((long)nbytes < 0)
+ croak("panic: malloc");
+#endif
+#endif /* safemalloc */
/*
* Convert amount of memory requested into
*/
if (nextf[bucket] == NULL)
morecore(bucket);
- if ((p = (union overhead *)nextf[bucket]) == NULL)
+ if ((p = (union overhead *)nextf[bucket]) == NULL) {
+#ifdef safemalloc
+ if (!nomemok) {
+ fputs("Out of memory!\n", stderr);
+ my_exit(1);
+ }
+#else
return (NULL);
+#endif
+ }
+
+#ifdef safemalloc
+ DEBUG_m(fprintf(stderr,"0x%lx: (%05d) malloc %ld bytes\n",
+ (unsigned long)(p+1),an++,(long)size));
+#endif /* safemalloc */
+
/* remove from linked list */
- if (*((int*)p) > 0x10000000)
- fprintf(stderr,"Corrupt malloc ptr 0x%x at 0x%x\n",*((int*)p),p);
- nextf[bucket] = nextf[bucket]->ov_next;
+#ifdef RCHECK
+ if (*((int*)p) & (sizeof(union overhead) - 1))
+ fprintf(stderr,"Corrupt malloc ptr 0x%lx at 0x%lx\n",
+ (unsigned long)*((int*)p),(unsigned long)p);
+#endif
+ nextf[bucket] = p->ov_next;
p->ov_magic = MAGIC;
p->ov_index= bucket;
-#ifdef MSTATS
+#ifdef DEBUGGING_MSTATS
nmalloc[bucket]++;
#endif
#ifdef RCHECK
p->ov_rmagic = RMAGIC;
*((u_int *)((caddr_t)p + nbytes - RSLOP)) = RMAGIC;
#endif
- return ((char *)(p + 1));
+ return ((Malloc_t)(p + 1));
}
/*
* Allocate more memory to the indicated bucket.
*/
-static
+static void
morecore(bucket)
- register 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;
+ register MEM_SIZE siz;
if (nextf[bucket])
return;
* on a page boundary. Should
* make getpageize call?
*/
+#ifndef atarist /* on the atari we dont have to worry about this */
op = (union overhead *)sbrk(0);
+#ifndef I286
if ((int)op & 0x3ff)
- sbrk(1024 - ((int)op & 0x3ff));
+ (void)sbrk(1024 - ((int)op & 0x3ff));
+#else
+ /* The sbrk(0) call on the I286 always returns the next segment */
+#endif
+#endif /* atarist */
+
+#if !(defined(I286) || defined(atarist))
/* take 2k unless the block is bigger than that */
rnu = (bucket <= 8) ? 11 : bucket + 3;
+#else
+ /* take 16k unless the block is bigger than that
+ (80286s like large segments!), probably good on the atari too */
+ rnu = (bucket <= 11) ? 14 : bucket + 3;
+#endif
nblks = 1 << (rnu - (bucket + 3)); /* how many blocks to get */
if (rnu < bucket)
rnu = bucket;
- op = (union overhead *)sbrk(1 << rnu);
+ op = (union overhead *)sbrk(1L << rnu);
/* no more room! */
if ((int)op == -1)
return;
* Round up to minimum allocation size boundary
* and deduct from block count to reflect.
*/
+#ifndef I286
if ((int)op & 7) {
- op = (union overhead *)(((int)op + 8) &~ 7);
+ op = (union overhead *)(((MEM_SIZE)op + 8) &~ 7);
nblks--;
}
+#else
+ /* Again, this should always be ok on an 80286 */
+#endif
/*
* Add new memory allocated to that on
* free list for this hash bucket.
}
}
-free(cp)
- char *cp;
+Free_t
+free(mp)
+ Malloc_t mp;
{
- register int size;
+ register MEM_SIZE size;
register union overhead *op;
+ char *cp = (char*)mp;
+
+#ifdef safemalloc
+ DEBUG_m(fprintf(stderr,"0x%lx: (%05d) free\n",(unsigned long)cp,an++));
+#endif /* safemalloc */
if (cp == NULL)
return;
#ifdef debug
ASSERT(op->ov_magic == MAGIC); /* make sure it was in use */
#else
- if (op->ov_magic != MAGIC)
+ if (op->ov_magic != MAGIC) {
+#ifdef RCHECK
+ warn("%s free() ignored",
+ op->ov_rmagic == RMAGIC - 1 ? "Duplicate" : "Bad");
+#else
+ warn("Bad free() ignored");
+#endif
return; /* sanity */
+ }
#endif
#ifdef RCHECK
ASSERT(op->ov_rmagic == RMAGIC);
if (op->ov_index <= 13)
ASSERT(*(u_int *)((caddr_t)op + op->ov_size + 1 - RSLOP) == RMAGIC);
+ op->ov_rmagic = RMAGIC - 1;
#endif
ASSERT(op->ov_index < NBUCKETS);
size = op->ov_index;
op->ov_next = nextf[size];
nextf[size] = op;
-#ifdef MSTATS
+#ifdef DEBUGGING_MSTATS
nmalloc[size]--;
#endif
}
* 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
+ * ``reall_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.
*/
-int realloc_srchlen = 4; /* 4 should be plenty, -1 =>'s whole list */
+int reall_srchlen = 4; /* 4 should be plenty, -1 =>'s whole list */
-char *
-realloc(cp, nbytes)
- char *cp;
- unsigned nbytes;
+Malloc_t
+realloc(mp, nbytes)
+ Malloc_t mp;
+ MEM_SIZE nbytes;
{
- register u_int onb;
+ register MEM_SIZE onb;
union overhead *op;
char *res;
register int i;
int was_alloced = 0;
+ char *cp = (char*)mp;
+
+#ifdef safemalloc
+#ifdef DEBUGGING
+ MEM_SIZE size = nbytes;
+#endif
+
+#ifdef MSDOS
+ if (nbytes > 0xffff) {
+ fprintf(stderr, "Reallocation too large: %lx\n", size);
+ my_exit(1);
+ }
+#endif /* MSDOS */
+ if (!cp)
+ return malloc(nbytes);
+#ifdef DEBUGGING
+ if ((long)nbytes < 0)
+ croak("panic: realloc");
+#endif
+#endif /* safemalloc */
- if (cp == NULL)
- return (malloc(nbytes));
op = (union overhead *)((caddr_t)cp - sizeof (union overhead));
if (op->ov_magic == MAGIC) {
was_alloced++;
* 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.
+ * the last ``reall_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 = findbucket(op, reall_srchlen)) < 0)
i = 0;
}
- onb = (1 << (i + 3)) - sizeof (*op) - RSLOP;
+ onb = (1L << (i + 3)) - sizeof (*op) - RSLOP;
/* avoid the copy if same size block */
if (was_alloced &&
- nbytes <= onb && nbytes > (onb >> 1) - sizeof(*op) - RSLOP)
- return(cp);
- if ((res = malloc(nbytes)) == NULL)
- return (NULL);
- if (cp != res) /* common optimization */
- bcopy(cp, res, (nbytes < onb) ? nbytes : onb);
- if (was_alloced)
- free(cp);
- return (res);
+ nbytes <= onb && nbytes > (onb >> 1) - sizeof(*op) - RSLOP) {
+#ifdef RCHECK
+ /*
+ * Record new allocated size of block and
+ * bound space with magic numbers.
+ */
+ if (op->ov_index <= 13) {
+ /*
+ * 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 += sizeof (union overhead) + RSLOP;
+ nbytes = (nbytes + 3) &~ 3;
+ op->ov_size = nbytes - 1;
+ *((u_int *)((caddr_t)op + nbytes - RSLOP)) = RMAGIC;
+ }
+#endif
+ res = cp;
+ }
+ else {
+ if ((res = (char*)malloc(nbytes)) == NULL)
+ return (NULL);
+ if (cp != res) /* common optimization */
+ Copy(cp, res, (MEM_SIZE)(nbytes<onb?nbytes:onb), char);
+ if (was_alloced)
+ free(cp);
+ }
+
+#ifdef safemalloc
+#ifdef DEBUGGING
+ if (debug & 128) {
+ fprintf(stderr,"0x%lx: (%05d) rfree\n",(unsigned long)res,an++);
+ fprintf(stderr,"0x%lx: (%05d) realloc %ld bytes\n",
+ (unsigned long)res,an++,(long)size);
+ }
+#endif
+#endif /* safemalloc */
+ return ((Malloc_t)res);
}
/*
* header starts at ``freep''. If srchlen is -1 search the whole list.
* Return bucket number, or -1 if not found.
*/
-static
+static int
findbucket(freep, srchlen)
union overhead *freep;
int srchlen;
return (-1);
}
-#ifdef MSTATS
+#ifdef DEBUGGING_MSTATS
/*
* mstats - print out statistics about malloc
*
* for each size category, the second showing the number of mallocs -
* frees for each size category.
*/
-mstats(s)
+void
+dump_mstats(s)
char *s;
{
register int i, j;
register union overhead *p;
- int totfree = 0,
- totused = 0;
+ int topbucket=0, totfree=0, totused=0;
+ u_int nfree[NBUCKETS];
- fprintf(stderr, "Memory allocation statistics %s\nfree:\t", s);
- for (i = 0; i < NBUCKETS; i++) {
+ 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]);
+ nfree[i] = j;
+ totfree += nfree[i] * (1 << (i + 3));
totused += nmalloc[i] * (1 << (i + 3));
+ if (nfree[i] || nmalloc[i])
+ topbucket = i;
+ }
+ if (s)
+ fprintf(stderr, "Memory allocation statistics %s (buckets 8..%d)\n",
+ s, (1 << (topbucket + 3)) );
+ fprintf(stderr, " %7d free: ", totfree);
+ for (i=0; i <= topbucket; i++) {
+ fprintf(stderr, (i<5)?" %5d":" %3d", nfree[i]);
+ }
+ fprintf(stderr, "\n %7d used: ", totused);
+ for (i=0; i <= topbucket; i++) {
+ fprintf(stderr, (i<5)?" %5d":" %3d", nmalloc[i]);
}
- fprintf(stderr, "\n\tTotal in use: %d, total free: %d\n",
- totused, totfree);
+ fprintf(stderr, "\n");
+}
+#else
+void
+dump_mstats(s)
+ char *s;
+{
}
#endif
+#endif /* lint */
https://perl5.git.perl.org / perl5.git / blobdiff