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--- xnu/xnu-1504.9.26/libkern/c++/OSObject.cpp
+++ xnu/xnu-201.19/libkern/c++/OSObject.cpp
@@ -1,44 +1,32 @@
/*
- * Copyright (c) 2000 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@
*/
/* OSObject.cpp created by gvdl on Fri 1998-11-17 */
#include <libkern/c++/OSObject.h>
-#include <libkern/c++/OSArray.h>
#include <libkern/c++/OSSerialize.h>
+#include <libkern/c++/OSSymbol.h>
#include <libkern/c++/OSLib.h>
-#include <libkern/OSDebug.h>
#include <libkern/c++/OSCPPDebug.h>
-#include <IOKit/IOKitDebug.h>
#include <libkern/OSAtomic.h>
-
-#include <libkern/c++/OSCollection.h>
-
-#include <kern/queue.h>
__BEGIN_DECLS
int debug_ivars_size;
@@ -86,8 +74,6 @@
OSMetaClassDefineReservedUnused(OSObject, 13);
OSMetaClassDefineReservedUnused(OSObject, 14);
OSMetaClassDefineReservedUnused(OSObject, 15);
-
-#ifdef __ppc__
OSMetaClassDefineReservedUnused(OSObject, 16);
OSMetaClassDefineReservedUnused(OSObject, 17);
OSMetaClassDefineReservedUnused(OSObject, 18);
@@ -104,23 +90,9 @@
OSMetaClassDefineReservedUnused(OSObject, 29);
OSMetaClassDefineReservedUnused(OSObject, 30);
OSMetaClassDefineReservedUnused(OSObject, 31);
-#endif
-static const char *getClassName(const OSObject *obj)
-{
- const OSMetaClass *meta = obj->getMetaClass();
- return (meta) ? meta->getClassName() : "unknown class?";
-}
-bool OSObject::init()
- { return true; }
-
-#if (!__ppc__) || (__GNUC__ < 3)
-
-// Implemented in assembler in post gcc 3.x systems as we have a problem
-// where the destructor in gcc2.95 gets 2 arguments. The second argument
-// appears to be a flag argument. I have copied the assembler from Puma xnu
-// to OSRuntimeSupport.c So for 2.95 builds use the C
+bool OSObject::init() { return true; }
void OSObject::free()
{
const OSMetaClass *meta = getMetaClass();
@@ -129,140 +101,26 @@
meta->instanceDestructed();
delete this;
}
-#endif /* (!__ppc__) || (__GNUC__ < 3) */
int OSObject::getRetainCount() const
{
- return (int) ((UInt16) retainCount);
+ return retainCount;
}
-void OSObject::taggedRetain(const void *tag) const
+void OSObject::retain() const
{
- volatile UInt32 *countP = (volatile UInt32 *) &retainCount;
- UInt32 inc = 1;
- UInt32 origCount;
- UInt32 newCount;
-
- // Increment the collection bucket.
- if ((const void *) OSTypeID(OSCollection) == tag)
- inc |= (1UL<<16);
-
- do {
- origCount = *countP;
- if ( ((UInt16) origCount | 0x1) == 0xffff ) {
- const char *msg;
- if (origCount & 0x1) {
- // If count == 0xffff that means we are freeing now so we can
- // just return obviously somebody is cleaning up dangling
- // references.
- msg = "Attempting to retain a freed object";
- }
- else {
- // If count == 0xfffe then we have wrapped our reference count.
- // We should stop counting now as this reference must be
- // leaked rather than accidently wrapping around the clock and
- // freeing a very active object later.
-
-#if !DEBUG
- break; // Break out of update loop which pegs the reference
-#else /* DEBUG */
- // @@@ gvdl: eventually need to make this panic optional
- // based on a boot argument i.e. debug= boot flag
- msg = "About to wrap the reference count, reference leak?";
-#endif /* !DEBUG */
- }
- panic("OSObject::refcount: %s", msg);
- }
-
- newCount = origCount + inc;
- } while (!OSCompareAndSwap(origCount, newCount, const_cast<UInt32 *>(countP)));
+ OSIncrementAtomic((SInt32 *) &retainCount);
}
-void OSObject::taggedRelease(const void *tag) const
+void OSObject::release(int when) const
{
- taggedRelease(tag, 1);
-}
-
-void OSObject::taggedRelease(const void *tag, const int when) const
-{
- volatile UInt32 *countP = (volatile UInt32 *) &retainCount;
- UInt32 dec = 1;
- UInt32 origCount;
- UInt32 newCount;
- UInt32 actualCount;
-
- // Increment the collection bucket.
- if ((const void *) OSTypeID(OSCollection) == tag)
- dec |= (1UL<<16);
-
- do {
- origCount = *countP;
-
- if ( ((UInt16) origCount | 0x1) == 0xffff ) {
- if (origCount & 0x1) {
- // If count == 0xffff that means we are freeing now so we can
- // just return obviously somebody is cleaning up some dangling
- // references. So we blow out immediately.
- return;
- }
- else {
- // If count == 0xfffe then we have wrapped our reference
- // count. We should stop counting now as this reference must be
- // leaked rather than accidently freeing an active object later.
-
-#if !DEBUG
- return; // return out of function which pegs the reference
-#else /* DEBUG */
- // @@@ gvdl: eventually need to make this panic optional
- // based on a boot argument i.e. debug= boot flag
- panic("OSObject::refcount: %s",
- "About to unreference a pegged object, reference leak?");
-#endif /* !DEBUG */
- }
- }
- actualCount = origCount - dec;
- if ((UInt16) actualCount < when)
- newCount = 0xffff;
- else
- newCount = actualCount;
-
- } while (!OSCompareAndSwap(origCount, newCount, const_cast<UInt32 *>(countP)));
-
- //
- // This panic means that we have just attempted to release an object
- // whose retain count has gone to less than the number of collections
- // it is a member off. Take a panic immediately.
- // In fact the panic MAY not be a registry corruption but it is
- // ALWAYS the wrong thing to do. I call it a registry corruption 'cause
- // the registry is the biggest single use of a network of collections.
- //
-// xxx - this error message is overly-specific;
-// xxx - any code in the kernel could trip this,
-// xxx - and it applies as noted to all collections, not just the registry
- if ((UInt16) actualCount < (actualCount >> 16)) {
- panic("A kext releasing a(n) %s has corrupted the registry.",
- getClassName(this));
- }
-
- // Check for a 'free' condition and that if we are first through
- if (newCount == 0xffff) {
- (const_cast<OSObject *>(this))->free();
- }
+ if (OSDecrementAtomic((SInt32 *) &retainCount) <= when)
+ ((OSObject *) this)->free();
}
void OSObject::release() const
{
- taggedRelease(0);
-}
-
-void OSObject::retain() const
-{
- taggedRetain(0);
-}
-
-void OSObject::release(int when) const
-{
- taggedRelease(0, when);
+ release(1);
}
bool OSObject::serialize(OSSerialize *s) const
@@ -271,97 +129,29 @@
if (!s->addXMLStartTag(this, "string")) return false;
- if (!s->addString(getClassName(this))) return false;
+ const OSMetaClass *meta = getMetaClass();
+ const char *className = (meta)? meta->getClassName() : "unknown class?";
+
+ if (!s->addString(className)) return false;
if (!s->addString(" is not serializable")) return false;
return s->addXMLEndTag("string");
}
-
-thread_t gOSObjectTrackThread;
-
-queue_head_t gOSObjectTrackList =
- { (queue_t) &gOSObjectTrackList, (queue_t) &gOSObjectTrackList };
-
-lck_spin_t gOSObjectTrackLock;
-
-OSArray * OSFlushObjectTrackList(void)
-{
- OSArray * array;
- queue_entry_t next;
-
- array = OSArray::withCapacity(16);
-
- lck_spin_lock(&gOSObjectTrackLock);
- while (!queue_empty(&gOSObjectTrackList))
- {
- next = queue_first(&gOSObjectTrackList);
- remque(next);
- lck_spin_unlock(&gOSObjectTrackLock);
- array->setObject((OSObject *) (next + 1));
- lck_spin_lock(&gOSObjectTrackLock);
- }
- lck_spin_unlock(&gOSObjectTrackLock);
-
- return (array);
-}
-
-struct OSObjectTracking
-{
- queue_chain_t link;
- void * bt[14];
-};
-
void *OSObject::operator new(size_t size)
{
- size_t tracking = (gIOKitDebug & kOSTraceObjectAlloc)
- ? sizeof(OSObjectTracking) : 0;
- OSObjectTracking * mem = (OSObjectTracking *) kalloc(size + tracking);
-
+ void *mem = (void *) kalloc(size);
assert(mem);
-
- if (tracking)
- {
- if ((((thread_t) 1) == gOSObjectTrackThread) || (current_thread() == gOSObjectTrackThread))
- {
- (void) OSBacktrace(&mem->bt[0], sizeof(mem->bt) / sizeof(mem->bt[0]));
- lck_spin_lock(&gOSObjectTrackLock);
- enqueue_tail(&gOSObjectTrackList, &mem->link);
- lck_spin_unlock(&gOSObjectTrackLock);
- }
- else
- mem->link.next = 0;
- mem++;
- }
-
bzero(mem, size);
ACCUMSIZE(size);
- return (void *) mem;
+ return mem;
}
-void OSObject::operator delete(void *_mem, size_t size)
+void OSObject::operator delete(void *mem, size_t size)
{
- size_t tracking = (gIOKitDebug & kOSTraceObjectAlloc)
- ? sizeof(OSObjectTracking) : 0;
- OSObjectTracking * mem = (OSObjectTracking *) _mem;
-
- if (!mem)
- return;
-
- if (tracking)
- {
- mem--;
- if (mem->link.next)
- {
- lck_spin_lock(&gOSObjectTrackLock);
- remque(&mem->link);
- lck_spin_unlock(&gOSObjectTrackLock);
- }
- }
-
- kfree(mem, size + tracking);
+ kfree((vm_offset_t) mem, size);
ACCUMSIZE(-size);
}