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--- xnu/xnu-1228.3.13/libkern/c++/OSSymbol.cpp
+++ xnu/xnu-344.26/libkern/c++/OSSymbol.cpp
@@ -1,29 +1,23 @@
/*
- * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_HEADER_START@
*
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License"). You may not use this file except in compliance with the
+ * License. Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
*
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
*
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ * @APPLE_LICENSE_HEADER_END@
*/
/* IOSymbol.cpp created by gvdl on Fri 1998-11-17 */
@@ -51,24 +45,6 @@
#define ACCUMSIZE(s)
#endif
-#define INITIAL_POOL_SIZE (exp2ml(1 + log2(kInitBucketCount)))
-
-#define GROW_FACTOR (1)
-#define SHRINK_FACTOR (3)
-
-#define GROW_POOL() do \
- if (count * GROW_FACTOR > nBuckets) { \
- reconstructSymbols(true); \
- } \
-while (0)
-
-#define SHRINK_POOL() do \
- if (count * SHRINK_FACTOR < nBuckets && \
- nBuckets > INITIAL_POOL_SIZE) { \
- reconstructSymbols(false); \
- } \
-while (0)
-
class OSSymbolPool
{
private:
@@ -102,8 +78,7 @@
static unsigned long log2(unsigned int x);
static unsigned long exp2ml(unsigned int x);
- void reconstructSymbols(void);
- void reconstructSymbols(bool grow);
+ void reconstructSymbols();
public:
static void *operator new(size_t size);
@@ -118,7 +93,7 @@
inline void closeGate() { mutex_lock(poolGate); };
inline void openGate() { mutex_unlock(poolGate); };
- OSSymbol *findSymbol(const char *cString) const;
+ OSSymbol *findSymbol(const char *cString, OSSymbol ***replace) const;
OSSymbol *insertSymbol(OSSymbol *sym);
void removeSymbol(OSSymbol *sym);
@@ -138,14 +113,14 @@
void OSSymbolPool::operator delete(void *mem, size_t size)
{
- kfree(mem, size);
+ kfree((vm_offset_t)mem, size);
ACCUMSIZE(-size);
}
bool OSSymbolPool::init()
{
count = 0;
- nBuckets = INITIAL_POOL_SIZE;
+ nBuckets = exp2ml(1 + log2(kInitBucketCount));
buckets = (Bucket *) kalloc(nBuckets * sizeof(Bucket));
ACCUMSIZE(nBuckets * sizeof(Bucket));
if (!buckets)
@@ -170,12 +145,12 @@
OSSymbolPool::~OSSymbolPool()
{
if (buckets) {
- kfree(buckets, nBuckets * sizeof(Bucket));
+ kfree((vm_offset_t)buckets, nBuckets * sizeof(Bucket));
ACCUMSIZE(-(nBuckets * sizeof(Bucket)));
}
if (poolGate)
- kfree(poolGate, 36 * 4);
+ kfree((vm_offset_t) poolGate, 36 * 4);
}
unsigned long OSSymbolPool::log2(unsigned int x)
@@ -217,35 +192,14 @@
return thisBucket->symbolP[stateP->j];
}
-void OSSymbolPool::reconstructSymbols(void)
-{
- this->reconstructSymbols(true);
-}
-
-void OSSymbolPool::reconstructSymbols(bool grow)
-{
- unsigned int new_nBuckets = nBuckets;
+void OSSymbolPool::reconstructSymbols()
+{
+ OSSymbolPool old(this);
OSSymbol *insert;
OSSymbolPoolState state;
- if (grow) {
- new_nBuckets += new_nBuckets + 1;
- } else {
- /* Don't shrink the pool below the default initial size.
- */
- if (nBuckets <= INITIAL_POOL_SIZE) {
- return;
- }
- new_nBuckets = (new_nBuckets - 1) / 2;
- }
-
- /* Create old pool to iterate after doing above check, cause it
- * gets finalized at return.
- */
- OSSymbolPool old(this);
-
+ nBuckets += nBuckets + 1;
count = 0;
- nBuckets = new_nBuckets;
buckets = (Bucket *) kalloc(nBuckets * sizeof(Bucket));
ACCUMSIZE(nBuckets * sizeof(Bucket));
/* @@@ gvdl: Zero test and panic if can't set up pool */
@@ -256,7 +210,7 @@
insertSymbol(insert);
}
-OSSymbol *OSSymbolPool::findSymbol(const char *cString) const
+OSSymbol *OSSymbolPool::findSymbol(const char *cString, OSSymbol ***replace) const
{
Bucket *thisBucket;
unsigned int j, inLen, hash;
@@ -266,6 +220,8 @@
thisBucket = &buckets[hash % nBuckets];
j = thisBucket->count;
+ *replace = NULL;
+
if (!j)
return 0;
@@ -273,16 +229,28 @@
probeSymbol = (OSSymbol *) thisBucket->symbolP;
if (inLen == probeSymbol->length
- && (strcmp(probeSymbol->string, cString) == 0))
- return probeSymbol;
+ && (strcmp(probeSymbol->string, cString) == 0)) {
+ probeSymbol->retain();
+ if (probeSymbol->getRetainCount() != 0xffff)
+ return probeSymbol;
+ else
+ // replace this one
+ *replace = (OSSymbol **) &thisBucket->symbolP;
+ }
return 0;
}
for (list = thisBucket->symbolP; j--; list++) {
probeSymbol = *list;
if (inLen == probeSymbol->length
- && (strcmp(probeSymbol->string, cString) == 0))
- return probeSymbol;
+ && (strcmp(probeSymbol->string, cString) == 0)) {
+ probeSymbol->retain();
+ if (probeSymbol->getRetainCount() != 0xffff)
+ return probeSymbol;
+ else
+ // replace this one
+ *replace = list;
+ }
}
return 0;
@@ -303,7 +271,7 @@
thisBucket->symbolP = (OSSymbol **) sym;
thisBucket->count++;
count++;
- return sym;
+ return 0;
}
if (j == 1) {
@@ -321,9 +289,10 @@
thisBucket->symbolP = list;
thisBucket->count++;
count++;
- GROW_POOL();
-
- return sym;
+ if (count > nBuckets)
+ reconstructSymbols();
+
+ return 0;
}
for (list = thisBucket->symbolP; j--; list++) {
@@ -340,12 +309,13 @@
/* @@@ gvdl: Zero test and panic if can't set up pool */
list[0] = sym;
bcopy(thisBucket->symbolP, list + 1, j * sizeof(OSSymbol *));
- kfree(thisBucket->symbolP, j * sizeof(OSSymbol *));
+ kfree((vm_offset_t)thisBucket->symbolP, j * sizeof(OSSymbol *));
ACCUMSIZE(-(j * sizeof(OSSymbol *)));
thisBucket->symbolP = list;
- GROW_POOL();
-
- return sym;
+ if (count > nBuckets)
+ reconstructSymbols();
+
+ return 0;
}
void OSSymbolPool::removeSymbol(OSSymbol *sym)
@@ -369,7 +339,6 @@
thisBucket->symbolP = 0;
count--;
thisBucket->count--;
- SHRINK_POOL();
return;
}
return;
@@ -379,22 +348,20 @@
probeSymbol = list[0];
if (probeSymbol == sym) {
thisBucket->symbolP = (OSSymbol **) list[1];
- kfree(list, 2 * sizeof(OSSymbol *));
+ kfree((vm_offset_t)list, 2 * sizeof(OSSymbol *));
ACCUMSIZE(-(2 * sizeof(OSSymbol *)));
count--;
thisBucket->count--;
- SHRINK_POOL();
return;
}
probeSymbol = list[1];
if (probeSymbol == sym) {
thisBucket->symbolP = (OSSymbol **) list[0];
- kfree(list, 2 * sizeof(OSSymbol *));
+ kfree((vm_offset_t)list, 2 * sizeof(OSSymbol *));
ACCUMSIZE(-(2 * sizeof(OSSymbol *)));
count--;
thisBucket->count--;
- SHRINK_POOL();
return;
}
return;
@@ -414,7 +381,7 @@
bcopy(thisBucket->symbolP + thisBucket->count-j,
list + thisBucket->count-1-j,
j * sizeof(OSSymbol *));
- kfree(thisBucket->symbolP, thisBucket->count * sizeof(OSSymbol *));
+ kfree((vm_offset_t)thisBucket->symbolP, thisBucket->count * sizeof(OSSymbol *));
ACCUMSIZE(-(thisBucket->count * sizeof(OSSymbol *)));
thisBucket->symbolP = list;
count--;
@@ -472,62 +439,48 @@
const OSSymbol *OSSymbol::withCString(const char *cString)
{
+ OSSymbol **replace;
+
pool->closeGate();
- OSSymbol *oldSymb = pool->findSymbol(cString);
- if (!oldSymb) {
- OSSymbol *newSymb = new OSSymbol;
- if (!newSymb) {
- pool->openGate();
- return newSymb;
- }
-
- if (newSymb->OSString::initWithCString(cString))
- oldSymb = pool->insertSymbol(newSymb);
-
- if (newSymb == oldSymb) {
- pool->openGate();
- return newSymb; // return the newly created & inserted symbol.
- }
- else
- // Somebody else inserted the new symbol so free our copy
+ OSSymbol *newSymb = pool->findSymbol(cString, &replace);
+ if (!newSymb && (newSymb = new OSSymbol) ) {
+ if (newSymb->OSString::initWithCString(cString)) {
+ if (replace)
+ *replace = newSymb;
+ else
+ pool->insertSymbol(newSymb);
+ } else {
newSymb->OSString::free();
- }
-
- oldSymb->retain(); // Retain the old symbol before releasing the lock.
-
+ newSymb = 0;
+ }
+ }
pool->openGate();
- return oldSymb;
+
+ return newSymb;
}
const OSSymbol *OSSymbol::withCStringNoCopy(const char *cString)
{
+ OSSymbol **replace;
+
pool->closeGate();
- OSSymbol *oldSymb = pool->findSymbol(cString);
- if (!oldSymb) {
- OSSymbol *newSymb = new OSSymbol;
- if (!newSymb) {
- pool->openGate();
- return newSymb;
- }
-
- if (newSymb->OSString::initWithCStringNoCopy(cString))
- oldSymb = pool->insertSymbol(newSymb);
-
- if (newSymb == oldSymb) {
- pool->openGate();
- return newSymb; // return the newly created & inserted symbol.
- }
- else
- // Somebody else inserted the new symbol so free our copy
+ OSSymbol *newSymb = pool->findSymbol(cString, &replace);
+ if (!newSymb && (newSymb = new OSSymbol) ) {
+ if (newSymb->OSString::initWithCStringNoCopy(cString)) {
+ if (replace)
+ *replace = newSymb;
+ else
+ pool->insertSymbol(newSymb);
+ } else {
newSymb->OSString::free();
- }
-
- oldSymb->retain(); // Retain the old symbol before releasing the lock.
-
+ newSymb = 0;
+ }
+ }
pool->openGate();
- return oldSymb;
+
+ return newSymb;
}
void OSSymbol::checkForPageUnload(void *startAddr, void *endAddr)
@@ -550,21 +503,12 @@
pool->openGate();
}
-void OSSymbol::taggedRelease(const void *tag) const
-{
- super::taggedRelease(tag);
-}
-
-void OSSymbol::taggedRelease(const void *tag, const int when) const
+void OSSymbol::free()
{
pool->closeGate();
- super::taggedRelease(tag, when);
+ pool->removeSymbol(this);
pool->openGate();
-}
-
-void OSSymbol::free()
-{
- pool->removeSymbol(this);
+
super::free();
}