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diff --git a/src/libs/xpcom18a4/nsprpub/lib/ds/plarena.c b/src/libs/xpcom18a4/nsprpub/lib/ds/plarena.c
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation. Portions created by Netscape are
+ * Copyright (C) 1998-2000 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK *****
+ */
+
+/*
+ * Lifetime-based fast allocation, inspired by much prior art, including
+ * "Fast Allocation and Deallocation of Memory Based on Object Lifetimes"
+ * David R. Hanson, Software -- Practice and Experience, Vol. 20(1).
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "plarena.h"
+#include "prmem.h"
+#include "prbit.h"
+#include "prlog.h"
+#include "prlock.h"
+#include "prinit.h"
+
+static PLArena *arena_freelist;
+
+#ifdef PL_ARENAMETER
+static PLArenaStats *arena_stats_list;
+
+#define COUNT(pool,what) (pool)->stats.what++
+#else
+#define COUNT(pool,what) /* nothing */
+#endif
+
+#define PL_ARENA_DEFAULT_ALIGN sizeof(double)
+
+static PRLock *arenaLock;
+static PRCallOnceType once;
+
+/*
+** InitializeArenas() -- Initialize arena operations.
+**
+** InitializeArenas() is called exactly once and only once from
+** LockArena(). This function creates the arena protection
+** lock: arenaLock.
+**
+** Note: If the arenaLock cannot be created, InitializeArenas()
+** fails quietly, returning only PR_FAILURE. This percolates up
+** to the application using the Arena API. He gets no arena
+** from PL_ArenaAllocate(). It's up to him to fail gracefully
+** or recover.
+**
+*/
+static PRStatus InitializeArenas( void )
+{
+ PR_ASSERT( arenaLock == NULL );
+ arenaLock = PR_NewLock();
+ if ( arenaLock == NULL )
+ return PR_FAILURE;
+ else
+ return PR_SUCCESS;
+} /* end ArenaInitialize() */
+
+static PRStatus LockArena( void )
+{
+ PRStatus rc = PR_CallOnce( &once, InitializeArenas );
+
+ if ( PR_FAILURE != rc )
+ PR_Lock( arenaLock );
+ return(rc);
+} /* end LockArena() */
+
+static void UnlockArena( void )
+{
+ PR_Unlock( arenaLock );
+ return;
+} /* end UnlockArena() */
+
+PR_IMPLEMENT(void) PL_InitArenaPool(
+ PLArenaPool *pool, const char *name, PRUint32 size, PRUint32 align)
+{
+#if defined(XP_MAC)
+#pragma unused (name)
+#endif
+
+ if (align == 0)
+ align = PL_ARENA_DEFAULT_ALIGN;
+ pool->mask = PR_BITMASK(PR_CeilingLog2(align));
+ pool->first.next = NULL;
+ /* Set all three addresses in pool->first to the same dummy value.
+ * These addresses are only compared with each other, but never
+ * dereferenced. */
+ pool->first.base = pool->first.avail = pool->first.limit =
+ (PRUword)PL_ARENA_ALIGN(pool, &pool->first + 1);
+ pool->current = &pool->first;
+ pool->arenasize = size;
+#ifdef PL_ARENAMETER
+ memset(&pool->stats, 0, sizeof pool->stats);
+ pool->stats.name = strdup(name);
+ pool->stats.next = arena_stats_list;
+ arena_stats_list = &pool->stats;
+#endif
+}
+
+
+/*
+** PL_ArenaAllocate() -- allocate space from an arena pool
+**
+** Description: PL_ArenaAllocate() allocates space from an arena
+** pool.
+**
+** First, try to satisfy the request from arenas starting at
+** pool->current.
+**
+** If there is not enough space in the arena pool->current, try
+** to claim an arena, on a first fit basis, from the global
+** freelist (arena_freelist).
+**
+** If no arena in arena_freelist is suitable, then try to
+** allocate a new arena from the heap.
+**
+** Returns: pointer to allocated space or NULL
+**
+** Notes: The original implementation had some difficult to
+** solve bugs; the code was difficult to read. Sometimes it's
+** just easier to rewrite it. I did that. larryh.
+**
+** See also: bugzilla: 45343.
+**
+*/
+
+PR_IMPLEMENT(void *) PL_ArenaAllocate(PLArenaPool *pool, PRUint32 nb)
+{
+ PLArena *a;
+ char *rp; /* returned pointer */
+ PRUint32 nbOld;
+
+ PR_ASSERT((nb & pool->mask) == 0);
+
+ nbOld = nb;
+ nb = (PRUword)PL_ARENA_ALIGN(pool, nb); /* force alignment */
+ if (nb < nbOld)
+ return NULL;
+
+ /* attempt to allocate from arenas at pool->current */
+ {
+ a = pool->current;
+ do {
+ if ( a->avail +nb <= a->limit ) {
+ pool->current = a;
+ rp = (char *)a->avail;
+ a->avail += nb;
+ return rp;
+ }
+ } while( NULL != (a = a->next) );
+ }
+
+ /* attempt to allocate from arena_freelist */
+ {
+ PLArena *p; /* previous pointer, for unlinking from freelist */
+
+ /* lock the arena_freelist. Make access to the freelist MT-Safe */
+ if ( PR_FAILURE == LockArena())
+ return(0);
+
+ for ( a = p = arena_freelist; a != NULL ; p = a, a = a->next ) {
+ if ( a->base +nb <= a->limit ) {
+ if ( p == arena_freelist )
+ arena_freelist = a->next;
+ else
+ p->next = a->next;
+ UnlockArena();
+ a->avail = a->base;
+ rp = (char *)a->avail;
+ a->avail += nb;
+ /* the newly allocated arena is linked after pool->current
+ * and becomes pool->current */
+ a->next = pool->current->next;
+ pool->current->next = a;
+ pool->current = a;
+ if ( NULL == pool->first.next )
+ pool->first.next = a;
+ return(rp);
+ }
+ }
+ UnlockArena();
+ }
+
+ /* attempt to allocate from the heap */
+ {
+ PRUint32 sz = PR_MAX(pool->arenasize, nb);
+ sz += sizeof *a + pool->mask; /* header and alignment slop */
+ a = (PLArena*)PR_MALLOC(sz);
+ if ( NULL != a ) {
+ a->limit = (PRUword)a + sz;
+ a->base = a->avail = (PRUword)PL_ARENA_ALIGN(pool, a + 1);
+ rp = (char *)a->avail;
+ a->avail += nb;
+ PR_ASSERT(a->avail <= a->limit);
+ /* the newly allocated arena is linked after pool->current
+ * and becomes pool->current */
+ a->next = pool->current->next;
+ pool->current->next = a;
+ pool->current = a;
+ if ( NULL == pool->first.next )
+ pool->first.next = a;
+ PL_COUNT_ARENA(pool,++);
+ COUNT(pool, nmallocs);
+ return(rp);
+ }
+ }
+
+ /* we got to here, and there's no memory to allocate */
+ return(NULL);
+} /* --- end PL_ArenaAllocate() --- */
+
+PR_IMPLEMENT(void *) PL_ArenaGrow(
+ PLArenaPool *pool, void *p, PRUint32 size, PRUint32 incr)
+{
+ void *newp;
+
+ if (PR_UINT32_MAX - size < incr)
+ return NULL;
+ PL_ARENA_ALLOCATE(newp, pool, size + incr);
+ if (newp)
+ memcpy(newp, p, size);
+ return newp;
+}
+
+/*
+ * Free tail arenas linked after head, which may not be the true list head.
+ * Reset pool->current to point to head in case it pointed at a tail arena.
+ */
+static void FreeArenaList(PLArenaPool *pool, PLArena *head, PRBool reallyFree)
+{
+ PLArena **ap, *a;
+
+ ap = &head->next;
+ a = *ap;
+ if (!a)
+ return;
+
+#ifdef DEBUG
+ do {
+ PR_ASSERT(a->base <= a->avail && a->avail <= a->limit);
+ a->avail = a->base;
+ PL_CLEAR_UNUSED(a);
+ } while ((a = a->next) != 0);
+ a = *ap;
+#endif
+
+ if (reallyFree) {
+ do {
+ *ap = a->next;
+ PL_CLEAR_ARENA(a);
+ PL_COUNT_ARENA(pool,--);
+ PR_DELETE(a);
+ } while ((a = *ap) != 0);
+ } else {
+ /* Insert the whole arena chain at the front of the freelist. */
+ do {
+ ap = &(*ap)->next;
+ } while (*ap);
+ LockArena();
+ *ap = arena_freelist;
+ arena_freelist = a;
+ head->next = 0;
+ UnlockArena();
+ }
+
+ pool->current = head;
+}
+
+PR_IMPLEMENT(void) PL_ArenaRelease(PLArenaPool *pool, char *mark)
+{
+ PLArena *a;
+
+ for (a = pool->first.next; a; a = a->next) {
+ if (PR_UPTRDIFF(mark, a->base) < PR_UPTRDIFF(a->avail, a->base)) {
+ a->avail = (PRUword)PL_ARENA_ALIGN(pool, mark);
+ FreeArenaList(pool, a, PR_FALSE);
+ return;
+ }
+ }
+}
+
+PR_IMPLEMENT(void) PL_FreeArenaPool(PLArenaPool *pool)
+{
+ FreeArenaList(pool, &pool->first, PR_FALSE);
+ COUNT(pool, ndeallocs);
+}
+
+PR_IMPLEMENT(void) PL_FinishArenaPool(PLArenaPool *pool)
+{
+ FreeArenaList(pool, &pool->first, PR_TRUE);
+#ifdef PL_ARENAMETER
+ {
+ PLArenaStats *stats, **statsp;
+
+ if (pool->stats.name)
+ PR_DELETE(pool->stats.name);
+ for (statsp = &arena_stats_list; (stats = *statsp) != 0;
+ statsp = &stats->next) {
+ if (stats == &pool->stats) {
+ *statsp = stats->next;
+ return;
+ }
+ }
+ }
+#endif
+}
+
+PR_IMPLEMENT(void) PL_CompactArenaPool(PLArenaPool *ap)
+{
+#if XP_MAC
+#pragma unused (ap)
+#if 0
+ PRArena *curr = &(ap->first);
+ while (curr) {
+ reallocSmaller(curr, curr->avail - (uprword_t)curr);
+ curr->limit = curr->avail;
+ curr = curr->next;
+ }
+#endif
+#endif
+}
+
+PR_IMPLEMENT(void) PL_ArenaFinish(void)
+{
+ PLArena *a, *next;
+
+ for (a = arena_freelist; a; a = next) {
+ next = a->next;
+ PR_DELETE(a);
+ }
+ arena_freelist = NULL;
+
+ if (arenaLock) {
+ PR_DestroyLock(arenaLock);
+ arenaLock = NULL;
+ }
+}
+
+#ifdef PL_ARENAMETER
+PR_IMPLEMENT(void) PL_ArenaCountAllocation(PLArenaPool *pool, PRUint32 nb)
+{
+ pool->stats.nallocs++;
+ pool->stats.nbytes += nb;
+ if (nb > pool->stats.maxalloc)
+ pool->stats.maxalloc = nb;
+ pool->stats.variance += nb * nb;
+}
+
+PR_IMPLEMENT(void) PL_ArenaCountInplaceGrowth(
+ PLArenaPool *pool, PRUint32 size, PRUint32 incr)
+{
+ pool->stats.ninplace++;
+}
+
+PR_IMPLEMENT(void) PL_ArenaCountGrowth(
+ PLArenaPool *pool, PRUint32 size, PRUint32 incr)
+{
+ pool->stats.ngrows++;
+ pool->stats.nbytes += incr;
+ pool->stats.variance -= size * size;
+ size += incr;
+ if (size > pool->stats.maxalloc)
+ pool->stats.maxalloc = size;
+ pool->stats.variance += size * size;
+}
+
+PR_IMPLEMENT(void) PL_ArenaCountRelease(PLArenaPool *pool, char *mark)
+{
+ pool->stats.nreleases++;
+}
+
+PR_IMPLEMENT(void) PL_ArenaCountRetract(PLArenaPool *pool, char *mark)
+{
+ pool->stats.nfastrels++;
+}
+
+#include <math.h>
+#include <stdio.h>
+
+PR_IMPLEMENT(void) PL_DumpArenaStats(FILE *fp)
+{
+ PLArenaStats *stats;
+ double mean, variance;
+
+ for (stats = arena_stats_list; stats; stats = stats->next) {
+ if (stats->nallocs != 0) {
+ mean = (double)stats->nbytes / stats->nallocs;
+ variance = fabs(stats->variance / stats->nallocs - mean * mean);
+ } else {
+ mean = variance = 0;
+ }
+
+ fprintf(fp, "\n%s allocation statistics:\n", stats->name);
+ fprintf(fp, " number of arenas: %u\n", stats->narenas);
+ fprintf(fp, " number of allocations: %u\n", stats->nallocs);
+ fprintf(fp, " number of free arena reclaims: %u\n", stats->nreclaims);
+ fprintf(fp, " number of malloc calls: %u\n", stats->nmallocs);
+ fprintf(fp, " number of deallocations: %u\n", stats->ndeallocs);
+ fprintf(fp, " number of allocation growths: %u\n", stats->ngrows);
+ fprintf(fp, " number of in-place growths: %u\n", stats->ninplace);
+ fprintf(fp, "number of released allocations: %u\n", stats->nreleases);
+ fprintf(fp, " number of fast releases: %u\n", stats->nfastrels);
+ fprintf(fp, " total bytes allocated: %u\n", stats->nbytes);
+ fprintf(fp, " mean allocation size: %g\n", mean);
+ fprintf(fp, " standard deviation: %g\n", sqrt(variance));
+ fprintf(fp, " maximum allocation size: %u\n", stats->maxalloc);
+ }
+}
+#endif /* PL_ARENAMETER */