Delete bundled copy of NSS and replace with README.

nspr/pr/src/malloc/prmalloc.c

Index: nspr/pr/src/malloc/prmalloc.c
diff --git a/nspr/pr/src/malloc/prmalloc.c b/nspr/pr/src/malloc/prmalloc.c
deleted file mode 100644
index 174d0daf79c357eb4b709ee8271677d3c52afe79..0000000000000000000000000000000000000000
--- a/nspr/pr/src/malloc/prmalloc.c
+++ /dev/null
@@ -1,1142 +0,0 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "primpl.h"
-
-/*
-** We override malloc etc. on any platform which has preemption +
-** nspr20 user level threads.  When we're debugging, we can make our
-** version of malloc fail occasionally.
-*/
-#ifdef _PR_OVERRIDE_MALLOC
-
-/*
-** Thread safe version of malloc, calloc, realloc, free
-*/
-#include <stdarg.h>
-
-#ifdef DEBUG
-#define SANITY
-#define EXTRA_SANITY
-#else
-#undef SANITY
-#undef EXTRA_SANITY
-#endif
-
-/* Forward decls */
-void *_PR_UnlockedMalloc(size_t size);
-void _PR_UnlockedFree(void *ptr);
-void *_PR_UnlockedRealloc(void *ptr, size_t size);
-void *_PR_UnlockedCalloc(size_t n, size_t elsize);
-
-/************************************************************************/
-
-/*
- * ----------------------------------------------------------------------------
- * "THE BEER-WARE LICENSE" (Revision 42):
- * <phk@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
- * can do whatever you want with this stuff. If we meet some day, and you think
- * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
- * ----------------------------------------------------------------------------
- *
- */
-
-/*
- * Defining SANITY will enable some checks which will tell you if the users
- * program did botch something
- */
-
-/*
- * Defining EXTRA_SANITY will enable some checks which are mostly related
- * to internal conditions in malloc.c
- */
-
-/*
- * Very verbose progress on stdout...
- */
-#if 0
-#  define TRACE(foo)    printf  foo
-static int malloc_event;
-#else
-#  define TRACE(foo)	
-#endif
-
-/* XXX Pick a number, any number */
-#   define malloc_pagesize		4096UL
-#   define malloc_pageshift		12UL
-
-#ifdef XP_UNIX
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/mman.h>
-#endif
-
-/*
- * This structure describes a page's worth of chunks.
- */
-
-struct pginfo {
-    struct pginfo	*next;	/* next on the free list */
-    char		*page;	/* Pointer to the page */
-    u_short		size;	/* size of this page's chunks */
-    u_short		shift;	/* How far to shift for this size chunks */
-    u_short		free;	/* How many free chunks */
-    u_short		total;	/* How many chunk */
-    u_long		bits[1]; /* Which chunks are free */
-};
-
-struct pgfree {
-    struct pgfree	*next;	/* next run of free pages */
-    struct pgfree	*prev;	/* prev run of free pages */
-    char		*page;	/* pointer to free pages */
-    char		*end;	/* pointer to end of free pages */
-    u_long		size;	/* number of bytes free */
-};
-
-/*
- * How many bits per u_long in the bitmap.
- * Change only if not 8 bits/byte
- */
-#define	MALLOC_BITS	(8*sizeof(u_long))
-
-/*
- * Magic values to put in the page_directory
- */
-#define MALLOC_NOT_MINE	((struct pginfo*) 0)
-#define MALLOC_FREE 	((struct pginfo*) 1)
-#define MALLOC_FIRST	((struct pginfo*) 2)
-#define MALLOC_FOLLOW	((struct pginfo*) 3)
-#define MALLOC_MAGIC	((struct pginfo*) 4)
-
-/*
- * Set to one when malloc_init has been called
- */
-static	unsigned	initialized;
-
-/*
- * The size of a page.
- * Must be a integral multiplum of the granularity of mmap(2).
- * Your toes will curl if it isn't a power of two
- */
-#define malloc_pagemask	((malloc_pagesize)-1)
-
-/*
- * The size of the largest chunk.
- * Half a page.
- */
-#define malloc_maxsize	((malloc_pagesize)>>1)
-
-/*
- * malloc_pagesize == 1 << malloc_pageshift
- */
-#ifndef malloc_pageshift
-static	unsigned	malloc_pageshift;
-#endif /* malloc_pageshift */
-
-/*
- * The smallest allocation we bother about.
- * Must be power of two
- */
-#ifndef malloc_minsize
-static	unsigned  malloc_minsize;
-#endif /* malloc_minsize */
-
-/*
- * The largest chunk we care about.
- * Must be smaller than pagesize
- * Must be power of two
- */
-#ifndef malloc_maxsize
-static	unsigned  malloc_maxsize;
-#endif /* malloc_maxsize */
-
-#ifndef malloc_cache
-static	unsigned  malloc_cache;
-#endif /* malloc_cache */
-
-/*
- * The offset from pagenumber to index into the page directory
- */
-static	u_long  malloc_origo;
-
-/*
- * The last index in the page directory we care about
- */
-static	u_long  last_index;
-
-/*
- * Pointer to page directory.
- * Allocated "as if with" malloc
- */
-static	struct	pginfo **page_dir;
-
-/*
- * How many slots in the page directory
- */
-static	unsigned	malloc_ninfo;
-
-/*
- * Free pages line up here 
- */
-static struct pgfree	free_list;
-
-/*
- * Abort() if we fail to get VM ?
- */
-static int malloc_abort;
-
-#ifdef SANITY
-/*
- * Are we trying to die ?
- */
-static int suicide;
-#endif
-
-/*
- * dump statistics
- */
-static int malloc_stats;
-
-/*
- * always realloc ?
- */
-static int malloc_realloc;
-
-/*
- * my last break.
- */
-static void *malloc_brk;
-
-/*
- * one location cache for free-list holders
- */
-static struct pgfree *px;
-
-static int set_pgdir(void *ptr, struct  pginfo *info);
-static int extend_page_directory(u_long index);
-
-#ifdef SANITY
-void
-malloc_dump(FILE *fd)
-{
-    struct pginfo **pd;
-    struct pgfree *pf;
-    int j;
-
-    pd = page_dir;
-
-    /* print out all the pages */
-    for(j=0;j<=last_index;j++) {
-	fprintf(fd,"%08lx %5d ",(j+malloc_origo) << malloc_pageshift,j);
-	if (pd[j] == MALLOC_NOT_MINE) {
-	    for(j++;j<=last_index && pd[j] == MALLOC_NOT_MINE;j++)
-		;
-	    j--;
-	    fprintf(fd,".. %5d not mine\n",	j);
-	} else if (pd[j] == MALLOC_FREE) {
-	    for(j++;j<=last_index && pd[j] == MALLOC_FREE;j++)
-		;
-	    j--;
-	    fprintf(fd,".. %5d free\n", j);
-	} else if (pd[j] == MALLOC_FIRST) {
-	    for(j++;j<=last_index && pd[j] == MALLOC_FOLLOW;j++)
-		;
-	    j--;
-	    fprintf(fd,".. %5d in use\n", j);
-	} else if (pd[j] < MALLOC_MAGIC) {
-	    fprintf(fd,"(%p)\n", pd[j]);
-	} else {
-	    fprintf(fd,"%p %d (of %d) x %d @ %p --> %p\n",
-		pd[j],pd[j]->free, pd[j]->total, 
-		pd[j]->size, pd[j]->page, pd[j]->next);
-	}
-    }
-
-    for(pf=free_list.next; pf; pf=pf->next) {
-	fprintf(fd,"Free: @%p [%p...%p[ %ld ->%p <-%p\n",
-		pf,pf->page,pf->end,pf->size,pf->prev,pf->next);
-	if (pf == pf->next) {
-		fprintf(fd,"Free_list loops.\n");
-		break;
-	}
-    }
-
-    /* print out various info */
-    fprintf(fd,"Minsize\t%d\n",malloc_minsize);
-    fprintf(fd,"Maxsize\t%ld\n",malloc_maxsize);
-    fprintf(fd,"Pagesize\t%ld\n",malloc_pagesize);
-    fprintf(fd,"Pageshift\t%ld\n",malloc_pageshift);
-    fprintf(fd,"FirstPage\t%ld\n",malloc_origo);
-    fprintf(fd,"LastPage\t%ld %lx\n",last_index+malloc_pageshift,
-	(last_index + malloc_pageshift) << malloc_pageshift);
-    fprintf(fd,"Break\t%ld\n",(u_long)sbrk(0) >> malloc_pageshift);
-}
-
-static void wrterror(char *fmt, ...)
-{
-    char *q = "malloc() error: ";
-    char buf[100];
-    va_list ap;
-
-    suicide = 1;
-
-    va_start(ap, fmt);
-    PR_vsnprintf(buf, sizeof(buf), fmt, ap);
-    va_end(ap);
-    fputs(q, stderr);
-    fputs(buf, stderr);
-
-    malloc_dump(stderr);
-    PR_Abort();
-}
-
-static void wrtwarning(char *fmt, ...)
-{
-    char *q = "malloc() warning: ";
-    char buf[100];
-    va_list ap;
-
-    va_start(ap, fmt);
-    PR_vsnprintf(buf, sizeof(buf), fmt, ap);
-    va_end(ap);
-    fputs(q, stderr);
-    fputs(buf, stderr);
-}
-#endif /* SANITY */
-
-
-/*
- * Allocate a number of pages from the OS
- */
-static caddr_t
-map_pages(int pages, int update)
-{
-    caddr_t result,tail;
-
-    result = ((caddr_t)sbrk(0)) + malloc_pagemask - 1;
-    result = (caddr_t) ((u_long)result & ~malloc_pagemask);
-    tail = result + (pages << malloc_pageshift);
-    if (!brk(tail)) {
-	last_index = ((u_long)tail >> malloc_pageshift) - malloc_origo -1;
-	malloc_brk = tail;
-	TRACE(("%6d S %p .. %p\n",malloc_event++, result, tail));
-	if (!update || last_index < malloc_ninfo ||
-	  extend_page_directory(last_index))
-	    return result;
-    }
-    TRACE(("%6d s %d %p %d\n",malloc_event++,pages,sbrk(0),errno));
-#ifdef EXTRA_SANITY
-    wrterror("map_pages fails\n");
-#endif
-    return 0;
-}
-
-#define set_bit(_pi,_bit) \
-    (_pi)->bits[(_bit)/MALLOC_BITS] |= 1L<<((_bit)%MALLOC_BITS)
-
-#define clr_bit(_pi,_bit) \
-    (_pi)->bits[(_bit)/MALLOC_BITS] &= ~(1L<<((_bit)%MALLOC_BITS));
-
-#define tst_bit(_pi,_bit) \
-    ((_pi)->bits[(_bit)/MALLOC_BITS] & (1L<<((_bit)%MALLOC_BITS)))
-
-/*
- * Extend page directory
- */
-static int
-extend_page_directory(u_long index)
-{
-    struct  pginfo **young, **old;
-    int i;
-
-    TRACE(("%6d E %lu\n",malloc_event++,index));
-    
-    /* Make it this many pages */
-    i = index * sizeof *page_dir;
-    i /= malloc_pagesize;
-    i += 2;
-
-    /* Get new pages, if you used this much mem you don't care :-) */
-    young = (struct pginfo**) map_pages(i,0);
-    if (!young)
-	return 0;
-
-    /* Copy the old stuff */
-    memset(young, 0, i * malloc_pagesize);
-    memcpy(young, page_dir,
-	    malloc_ninfo * sizeof *page_dir);
-
-    /* register the new size */
-    malloc_ninfo = i * malloc_pagesize / sizeof *page_dir;
-
-    /* swap the pointers */
-    old = page_dir;
-    page_dir = young;
-
-    /* Mark the pages */
-    index = ((u_long)young >> malloc_pageshift) - malloc_origo;
-    page_dir[index] = MALLOC_FIRST;
-    while (--i) {
-	page_dir[++index] = MALLOC_FOLLOW;
-    }
-
-    /* Now free the old stuff */
-    _PR_UnlockedFree(old);
-    return 1;
-}
-
-/*
- * Set entry in page directory.
- * Extend page directory if need be.
- */
-static int
-set_pgdir(void *ptr, struct  pginfo *info)
-{
-    u_long index = ((u_long)ptr >> malloc_pageshift) - malloc_origo;
-
-    if (index >= malloc_ninfo && !extend_page_directory(index))
-	return 0;
-    page_dir[index] = info;
-    return 1;
-}
-
-/*
- * Initialize the world
- */
-static void
-malloc_init (void)
-{
-    int i;
-    char *p;
-
-    TRACE(("%6d I\n",malloc_event++));
-#ifdef DEBUG
-    for (p=getenv("MALLOC_OPTIONS"); p && *p; p++) {
-	switch (*p) {
-	    case 'a': malloc_abort = 0; break;
-	    case 'A': malloc_abort = 1; break;
-	    case 'd': malloc_stats = 0; break;
-	    case 'D': malloc_stats = 1; break;
-	    case 'r': malloc_realloc = 0; break;
-	    case 'R': malloc_realloc = 1; break;
-	    default:
-		wrtwarning("Unknown chars in MALLOC_OPTIONS\n");
-		break;
-	}
-    }
-#endif
-
-#ifndef malloc_pagesize
-    /* determine our pagesize */
-    malloc_pagesize = getpagesize();
-#endif /* malloc_pagesize */
-
-#ifndef malloc_pageshift
-    /* determine how much we shift by to get there */
-    for (i = malloc_pagesize; i > 1; i >>= 1)
-	malloc_pageshift++;
-#endif /* malloc_pageshift */
-
-#ifndef malloc_cache
-    malloc_cache = 50 << malloc_pageshift;	
-#endif /* malloc_cache */
-
-#ifndef malloc_minsize
-    /*
-     * find the smallest size allocation we will bother about.
-     * this is determined as the smallest allocation that can hold
-     * it's own pginfo;
-     */
-    i = 2;
-    for(;;) {
-	int j;
-
-	/* Figure out the size of the bits */
-	j = malloc_pagesize/i;
-	j /= 8;
-	if (j < sizeof(u_long))
-		j = sizeof (u_long);
-	if (sizeof(struct pginfo) + j - sizeof (u_long) <= i)
-		break;
-	i += i;
-    }
-    malloc_minsize = i;
-#endif /* malloc_minsize */
-
-
-    /* Allocate one page for the page directory */
-    page_dir = (struct pginfo **) map_pages(1,0);
-#ifdef SANITY
-    if (!page_dir)
-	wrterror("fatal: my first mmap failed.  (check limits ?)\n");
-#endif
-
-    /*
-     * We need a maximum of malloc_pageshift buckets, steal these from the
-     * front of the page_directory;
-     */
-    malloc_origo = (u_long) page_dir >> malloc_pageshift;
-    malloc_origo -= malloc_pageshift;
-
-    /* Clear it */
-    memset(page_dir,0,malloc_pagesize);
-
-    /* Find out how much it tells us */
-    malloc_ninfo = malloc_pagesize / sizeof *page_dir;
-
-    /* Plug the page directory into itself */
-    i = set_pgdir(page_dir,MALLOC_FIRST);
-#ifdef SANITY
-    if (!i)
-	wrterror("fatal: couldn't set myself in the page directory\n");
-#endif
-
-    /* Been here, done that */
-    initialized++;
-}
-
-/*
- * Allocate a number of complete pages
- */
-static void *malloc_pages(size_t size)
-{
-    void *p,*delay_free = 0;
-    int i;
-    struct pgfree *pf;
-    u_long index;
-
-    /* How many pages ? */
-    size += (malloc_pagesize-1);
-    size &= ~malloc_pagemask;
-
-    p = 0;
-    /* Look for free pages before asking for more */
-    for(pf = free_list.next; pf; pf = pf->next) {
-#ifdef EXTRA_SANITY
-	if (pf->page == pf->end)
-	    wrterror("zero entry on free_list\n");
-	if (pf->page > pf->end) {
-	    TRACE(("%6d !s %p %p %p <%d>\n",malloc_event++,
-		pf,pf->page,pf->end,__LINE__));
-	    wrterror("sick entry on free_list\n");
-	}
-	if ((void*)pf->page >= (void*)sbrk(0))
-	    wrterror("entry on free_list past brk\n");
-	if (page_dir[((u_long)pf->page >> malloc_pageshift) - malloc_origo] 
-	  != MALLOC_FREE) {
-	    TRACE(("%6d !f %p %p %p <%d>\n",malloc_event++,
-		pf,pf->page,pf->end,__LINE__));
-	    wrterror("non-free first page on free-list\n");
-	}
-	if (page_dir[((u_long)pf->end >> malloc_pageshift) - 1 - malloc_origo] 
-	  != MALLOC_FREE)
-	    wrterror("non-free last page on free-list\n");
-#endif /* EXTRA_SANITY */
-	if (pf->size < size) 
-	    continue;
-	else if (pf->size == size) {
-	    p = pf->page;
-	    if (pf->next)
-		    pf->next->prev = pf->prev;
-	    pf->prev->next = pf->next;
-	    delay_free = pf;
-	    break;
-	} else {
-	    p = pf->page;
-	    pf->page += size;
-	    pf->size -= size;
-	    break;
-        }
-    }
-#ifdef EXTRA_SANITY
-    if (p && page_dir[((u_long)p >> malloc_pageshift) - malloc_origo] 
-      != MALLOC_FREE) {
-	wrterror("allocated non-free page on free-list\n");
-    }
-#endif /* EXTRA_SANITY */
-
-    size >>= malloc_pageshift;
-
-    /* Map new pages */
-    if (!p)
-	p = map_pages(size,1);
-
-    if (p) {
-	/* Mark the pages in the directory */
-	index = ((u_long)p >> malloc_pageshift) - malloc_origo;
-	page_dir[index] = MALLOC_FIRST;
-	for (i=1;i<size;i++)
-	    page_dir[index+i] = MALLOC_FOLLOW;
-    }
-    if (delay_free) {
-	if (!px) 
-	    px = (struct pgfree*)delay_free;
-	else
-	    _PR_UnlockedFree(delay_free);
-    }
-    return p;
-}
-
-/*
- * Allocate a page of fragments
- */
-
-static int
-malloc_make_chunks(int bits)
-{
-    struct  pginfo *bp;
-    void *pp;
-    int i,k,l;
-
-    /* Allocate a new bucket */
-    pp = malloc_pages(malloc_pagesize);
-    if (!pp)
-	return 0;
-    l = sizeof *bp - sizeof(u_long);
-    l += sizeof(u_long) *
-	(((malloc_pagesize >> bits)+MALLOC_BITS-1) / MALLOC_BITS);
-    if ((1<<(bits)) <= l+l) {
-	bp = (struct  pginfo *)pp;
-    } else {
-	bp = (struct  pginfo *)_PR_UnlockedMalloc(l);
-    }
-    if (!bp)
-	return 0;
-    bp->size = (1<<bits);
-    bp->shift = bits;
-    bp->total = bp->free = malloc_pagesize >> bits;
-    bp->next = page_dir[bits];
-    bp->page = (char*)pp;
-    i = set_pgdir(pp,bp);
-    if (!i)
-	return 0;
-
-    /* We can safely assume that there is nobody in this chain */
-    page_dir[bits] = bp;
-
-    /* set all valid bits in the bits */
-    k = bp->total;
-    i = 0;
-/*
-    for(;k-i >= MALLOC_BITS; i += MALLOC_BITS)
-	bp->bits[i / MALLOC_BITS] = ~0;
-*/
-    for(; i < k; i++)
-	set_bit(bp,i);
-
-    if (bp != pp)
-	return 1;
-
-    /* We may have used the first ones already */
-    for(i=0;l > 0;i++) {
-	clr_bit(bp,i);
-	bp->free--;
-	bp->total--;
-	l -= (1 << bits);
-    }
-    return 1;
-}
-
-/*
- * Allocate a fragment
- */
-static void *malloc_bytes(size_t size)
-{
-    size_t s;
-    int j;
-    struct  pginfo *bp;
-    int k;
-    u_long *lp, bf;
-
-    /* Don't bother with anything less than this */
-    if (size < malloc_minsize) {
-	size = malloc_minsize;
-    }
-
-    /* Find the right bucket */
-    j = 1;
-    s = size - 1;
-    while (s >>= 1) {
-        j++;
-    }
-
-    /* If it's empty, make a page more of that size chunks */
-    if (!page_dir[j] && !malloc_make_chunks(j))
-	return 0;
-
-    /* Find first word of bitmap which isn't empty */
-    bp = page_dir[j];
-    for (lp = bp->bits; !*lp; lp++)
-	;
-
-    /* Find that bit */
-    bf = *lp;
-    k = 0;
-    while ((bf & 1) == 0) {
-	bf >>= 1;
-	k++;
-    }
-
-    *lp ^= 1L<<k;                       /* clear it */
-    bp->free--;
-    if (!bp->free) {
-	page_dir[j] = bp->next;
-	bp->next = 0;
-    }
-    k += (lp - bp->bits)*MALLOC_BITS;
-    return bp->page + (k << bp->shift);
-}
-
-void *_PR_UnlockedMalloc(size_t size)
-{
-    void *result;
-
-    /* Round up to a multiple of 8 bytes */
-    if (size & 7) {
-	size = size + 8 - (size & 7);
-    }
-
-    if (!initialized)
-	malloc_init();
-
-#ifdef SANITY
-    if (suicide)
-	PR_Abort();
-#endif
-
-    if (size <= malloc_maxsize)
-	result =  malloc_bytes(size);
-    else
-	result =  malloc_pages(size);
-#ifdef SANITY
-    if (malloc_abort && !result)
-	wrterror("malloc() returns NULL\n");
-#endif
-    TRACE(("%6d M %p %d\n",malloc_event++,result,size));
-
-    return result;
-}
-
-void *_PR_UnlockedMemalign(size_t alignment, size_t size)
-{
-    void *result;
-
-    /*
-     * alignment has to be a power of 2
-     */
-
-    if ((size <= alignment) && (alignment <= malloc_maxsize))
-		size = alignment;	
-    else
-           	size += alignment - 1;	
-
-    /* Round up to a multiple of 8 bytes */
-    if (size & 7) {
-	size = size + 8 - (size & 7);
-    }
-
-    if (!initialized)
-	malloc_init();
-
-#ifdef SANITY
-    if (suicide)
-	abort();
-#endif
-
-    if (size <= malloc_maxsize)
-	result =  malloc_bytes(size);
-    else
-	result =  malloc_pages(size);
-#ifdef SANITY
-    if (malloc_abort && !result)
-	wrterror("malloc() returns NULL\n");
-#endif
-    TRACE(("%6d A %p %d\n",malloc_event++,result,size));
-
-    if ((u_long)result & (alignment - 1))
-    	return ((void *)(((u_long)result + alignment)  & ~(alignment - 1)));
-    else
-    	return result;
-}
-
-void *_PR_UnlockedCalloc(size_t n, size_t nelem)
-{
-    void *p;
-
-    /* Compute total size and then round up to a double word amount */
-    n *= nelem;
-    if (n & 7) {
-	n = n + 8 - (n & 7);
-    }
-
-    /* Get the memory */
-    p = _PR_UnlockedMalloc(n);
-    if (p) {
-	/* Zero it */
-	memset(p, 0, n);
-    }
-    return p;
-}
-
-/*
- * Change an allocation's size
- */
-void *_PR_UnlockedRealloc(void *ptr, size_t size)
-{
-    void *p;
-    u_long osize,page,index,tmp_index;
-    struct pginfo **mp;
-
-    if (!initialized)
-	malloc_init();
-
-#ifdef SANITY
-    if (suicide)
-	PR_Abort();
-#endif
-
-    /* used as free() */
-    TRACE(("%6d R %p %d\n",malloc_event++, ptr, size));
-    if (ptr && !size) {
-	_PR_UnlockedFree(ptr);
-	return _PR_UnlockedMalloc (1);
-    }
-
-    /* used as malloc() */
-    if (!ptr) {
-	p = _PR_UnlockedMalloc(size);
-	return p;
-    }
-
-    /* Find the page directory entry for the page in question */
-    page = (u_long)ptr >> malloc_pageshift;
-    index = page - malloc_origo;
-
-    /*
-     * check if memory was allocated by memalign
-     */
-    tmp_index = index;
-    while (page_dir[tmp_index] == MALLOC_FOLLOW)
-	tmp_index--;
-    if (tmp_index != index) {
-	/*
-	 * memalign-allocated memory
-	 */
-	index = tmp_index;
-	page = index + malloc_origo;			
-	ptr = (void *) (page << malloc_pageshift);
-    }
-    TRACE(("%6d R2 %p %d\n",malloc_event++, ptr, size));
-
-    /* make sure it makes sense in some fashion */
-    if (index < malloc_pageshift || index > last_index) {
-#ifdef SANITY
-	wrtwarning("junk pointer passed to realloc()\n");
-#endif
-	return 0;
-    }
-
-    /* find the size of that allocation, and see if we need to relocate */
-    mp = &page_dir[index];
-    if (*mp == MALLOC_FIRST) {
-	osize = malloc_pagesize;
-	while (mp[1] == MALLOC_FOLLOW) {
-	    osize += malloc_pagesize;
-	    mp++;
-	}
-        if (!malloc_realloc && 
-		size < osize && 
-		size > malloc_maxsize &&
-	    size > (osize - malloc_pagesize)) {
-	    return ptr;
-	}
-    } else if (*mp >= MALLOC_MAGIC) {
-	osize = (*mp)->size;
-	if (!malloc_realloc &&
-		size < osize && 
-	    (size > (*mp)->size/2 || (*mp)->size == malloc_minsize)) {
-	    return ptr;
-	}
-    } else {
-#ifdef SANITY
-	wrterror("realloc() of wrong page.\n");
-#endif
-    }
-
-    /* try to reallocate */
-    p = _PR_UnlockedMalloc(size);
-
-    if (p) {
-	/* copy the lesser of the two sizes */
-	if (osize < size)
-	    memcpy(p,ptr,osize);
-	else
-	    memcpy(p,ptr,size);
-	_PR_UnlockedFree(ptr);
-    }
-#ifdef DEBUG
-    else if (malloc_abort)
-	wrterror("realloc() returns NULL\n");
-#endif
-
-    return p;
-}
-
-/*
- * Free a sequence of pages
- */
-
-static void
-free_pages(char *ptr, u_long page, int index, struct pginfo *info)
-{
-    int i;
-    struct pgfree *pf,*pt;
-    u_long l;
-    char *tail;
-
-    TRACE(("%6d FP %p %d\n",malloc_event++, ptr, page));
-    /* Is it free already ? */
-    if (info == MALLOC_FREE) {
-#ifdef SANITY
-	wrtwarning("freeing free page at %p.\n", ptr);
-#endif
-	return;
-    }
-
-#ifdef SANITY
-    /* Is it not the right place to begin ? */
-    if (info != MALLOC_FIRST)
-	wrterror("freeing wrong page.\n");
-
-    /* Is this really a pointer to a page ? */
-    if ((u_long)ptr & malloc_pagemask)
-	wrterror("freeing messed up page pointer.\n");
-#endif
-
-    /* Count how many pages it is anyway */
-    page_dir[index] = MALLOC_FREE;
-    for (i = 1; page_dir[index+i] == MALLOC_FOLLOW; i++)
-	page_dir[index + i] = MALLOC_FREE;
-
-    l = i << malloc_pageshift;
-
-    tail = ptr+l;
-
-    /* add to free-list */
-    if (!px)
-	px = (struct pgfree*)_PR_UnlockedMalloc(sizeof *pt);
-    /* XXX check success */
-    px->page = ptr;
-    px->end =  tail;
-    px->size = l;
-    if (!free_list.next) {
-	px->next = free_list.next;
-	px->prev = &free_list;
-	free_list.next = px;
-	pf = px;
-	px = 0;
-    } else {
-	tail = ptr+l;
-	for(pf = free_list.next; pf->next && pf->end < ptr; pf = pf->next)
-	    ;
-	for(; pf; pf = pf->next) {
-	    if (pf->end == ptr ) {
-		/* append to entry */
-		pf->end += l;
-		pf->size += l;
-		if (pf->next && pf->end == pf->next->page ) {
-		    pt = pf->next;
-		    pf->end = pt->end;
-		    pf->size += pt->size;
-		    pf->next = pt->next;
-		    if (pf->next)
-			pf->next->prev = pf;
-		    _PR_UnlockedFree(pt);
-		}
-	    } else if (pf->page == tail) {
-		/* prepend to entry */
-		pf->size += l;
-		pf->page = ptr;
-	    } else if (pf->page > ptr) {
-		px->next = pf;
-		px->prev = pf->prev;
-		pf->prev = px;
-		px->prev->next = px;
-		pf = px;
-		px = 0;
-	    } else if (!pf->next) {
-		px->next = 0;
-		px->prev = pf;
-		pf->next = px;
-		pf = px;
-		px = 0;
-	    } else {
-		continue;
-	    }
-	    break;
-	}
-    }
-    if (!pf->next &&
-      pf->size > malloc_cache &&
-      pf->end == malloc_brk &&
-      malloc_brk == (void*)sbrk(0)) {
-	pf->end = pf->page + malloc_cache;
-	pf->size = malloc_cache;
-	TRACE(("%6d U %p %d\n",malloc_event++,pf->end,pf->end - pf->page));
-	brk(pf->end);
-	malloc_brk = pf->end;
-	/* Find the page directory entry for the page in question */
-	page = (u_long)pf->end >> malloc_pageshift;
-	index = page - malloc_origo;
-	/* Now update the directory */
-	for(i=index;i <= last_index;)
-	    page_dir[i++] = MALLOC_NOT_MINE;
-	last_index = index - 1;
-    }
-}
-
-/*
- * Free a chunk, and possibly the page it's on, if the page becomes empty.
- */
-
-static void
-free_bytes(void *ptr, u_long page, int index, struct pginfo *info)
-{
-    int i;
-    struct pginfo **mp;
-    void *vp;
-
-    /* Make sure that pointer is multiplum of chunk-size */
-#ifdef SANITY
-    if ((u_long)ptr & (info->size - 1))
-	wrterror("freeing messed up chunk pointer\n");
-#endif
-
-    /* Find the chunk number on the page */
-    i = ((u_long)ptr & malloc_pagemask) >> info->shift;
-
-    /* See if it's free already */
-    if (tst_bit(info,i)) {
-#ifdef SANITY
-	wrtwarning("freeing free chunk at %p\n", ptr);
-#endif
-	return;
-    }
-
-    /* Mark it free */
-    set_bit(info,i);
-    info->free++;
-
-    /* If the page was full before, we need to put it on the queue now */
-    if (info->free == 1) {
-	mp = page_dir + info->shift;
-	while (*mp && (*mp)->next && (*mp)->next->page < info->page)
-	    mp = &(*mp)->next;
-	info->next = *mp;
-	*mp = info;
-	return;
-    }
-
-    /* If this page isn't empty, don't do anything. */
-    if (info->free != info->total)
-	return;
-
-    /* We may want to keep at least one page of each size chunks around.  */
-    mp = page_dir + info->shift;
-    if (0 && (*mp == info) && !info->next)
-	return;
-
-    /* Find & remove this page in the queue */
-    while (*mp != info) {
-	mp = &((*mp)->next);
-#ifdef EXTRA_SANITY
-	if (!*mp) {
-		TRACE(("%6d !q %p\n",malloc_event++,info));
-		wrterror("Not on queue\n");
-	}
-#endif
-    }
-    *mp = info->next;
-
-    /* Free the page & the info structure if need be */
-    set_pgdir(info->page,MALLOC_FIRST);
-    if((void*)info->page == (void*)info) {
-	_PR_UnlockedFree(info->page);
-    } else {
-	vp = info->page;
-	_PR_UnlockedFree(info);
-	_PR_UnlockedFree(vp);
-    }
-}
-
-void _PR_UnlockedFree(void *ptr)
-{
-    u_long page;
-    struct pginfo *info;
-    int index, tmp_index;
-
-    TRACE(("%6d F %p\n",malloc_event++,ptr));
-    /* This is legal */
-    if (!ptr)
-	return;
-
-#ifdef SANITY
-    /* There wouldn't be anything to free */
-    if (!initialized) {
-	wrtwarning("free() called before malloc() ever got called\n");
-	return;
-    }
-#endif
-
-#ifdef SANITY
-    if (suicide)
-	PR_Abort();
-#endif
-
-    /* Find the page directory entry for the page in question */
-    page = (u_long)ptr >> malloc_pageshift;
-    index = page - malloc_origo;
-
-    /*
-     * check if memory was allocated by memalign
-     */
-    tmp_index = index;
-    while (page_dir[tmp_index] == MALLOC_FOLLOW)
-	tmp_index--;
-    if (tmp_index != index) {
-	/*
-	 * memalign-allocated memory
-	 */
-	index = tmp_index;
-	page = index + malloc_origo;			
-	ptr = (void *) (page << malloc_pageshift);
-    }
-    /* make sure it makes sense in some fashion */
-    if (index < malloc_pageshift) {
-#ifdef SANITY
-	wrtwarning("junk pointer %p (low) passed to free()\n", ptr);
-#endif
-	return;
-    }
-    if (index > last_index) {
-#ifdef SANITY
-	wrtwarning("junk pointer %p (high) passed to free()\n", ptr);
-#endif
-	return;
-    }
-
-    /* handle as page-allocation or chunk allocation */
-    info = page_dir[index];
-    if (info < MALLOC_MAGIC)
-        free_pages((char*)ptr, page, index, info);
-    else 
-	free_bytes(ptr,page,index,info);
-    return;
-}
-#endif /* _PR_OVERRIDE_MALLOC */