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/*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.memory;
import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
public class CMSCollector extends VMObject {
private static long markBitMapFieldOffset;
public CMSCollector(Address addr) {
super(addr);
}
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static synchronized void initialize(TypeDataBase db) {
Type type = db.lookupType("CMSCollector");
markBitMapFieldOffset = type.getField("_markBitMap").getOffset();
}
//Accessing mark bitmap
public CMSBitMap markBitMap() {
return (CMSBitMap) VMObjectFactory.newObject(
CMSBitMap.class,
addr.addOffsetTo(markBitMapFieldOffset));
}
public long blockSizeUsingPrintezisBits(Address addr) {
CMSBitMap markBitMap = markBitMap();
long addressSize = VM.getVM().getAddressSize();
if ( markBitMap.isMarked(addr) && markBitMap.isMarked(addr.addOffsetTo(1*addressSize)) ) {
Address nextOneAddr = markBitMap.getNextMarkedWordAddress(addr.addOffsetTo(2*addressSize));
//return size in bytes
long size = (nextOneAddr.addOffsetTo(1*addressSize)).minus(addr);
return size;
} else {
//missing Printezis marks
return -1;
}
}
}
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