| /* |
| * Copyright (c) 2001, 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.runtime; |
| |
| import java.util.*; |
| |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.utilities.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.types.*; |
| |
| public class ObjectSynchronizer { |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { |
| Type type; |
| try { |
| type = db.lookupType("ObjectSynchronizer"); |
| AddressField blockListField; |
| blockListField = type.getAddressField("gBlockList"); |
| gBlockListAddr = blockListField.getValue(); |
| blockSize = db.lookupIntConstant("ObjectSynchronizer::_BLOCKSIZE").intValue(); |
| } catch (RuntimeException e) { } |
| type = db.lookupType("ObjectMonitor"); |
| objectMonitorTypeSize = type.getSize(); |
| } |
| |
| public long identityHashValueFor(Oop obj) { |
| Mark mark = obj.getMark(); |
| if (mark.isUnlocked()) { |
| // FIXME: can not generate marks in debugging system |
| return mark.hash(); |
| } else if (mark.hasMonitor()) { |
| ObjectMonitor monitor = mark.monitor(); |
| Mark temp = monitor.header(); |
| return temp.hash(); |
| } else { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(VM.getVM().isDebugging(), "Can not access displaced header otherwise"); |
| } |
| if (mark.hasDisplacedMarkHelper()) { |
| Mark temp = mark.displacedMarkHelper(); |
| return temp.hash(); |
| } |
| // FIXME: can not do anything else here in debugging system |
| return 0; |
| } |
| } |
| |
| public static Iterator objectMonitorIterator() { |
| if (gBlockListAddr != null) { |
| return new ObjectMonitorIterator(); |
| } else { |
| return null; |
| } |
| } |
| |
| private static class ObjectMonitorIterator implements Iterator { |
| |
| // JVMTI raw monitors are not pointed by gBlockList |
| // and are not included by this Iterator. May add them later. |
| |
| ObjectMonitorIterator() { |
| blockAddr = gBlockListAddr; |
| index = blockSize - 1; |
| block = new ObjectMonitor(blockAddr); |
| } |
| |
| public boolean hasNext() { |
| return (index > 0 || block.freeNext() != null); |
| } |
| |
| public Object next() { |
| Address addr; |
| if (index > 0) { |
| addr = blockAddr.addOffsetTo(index*objectMonitorTypeSize); |
| } else { |
| blockAddr = block.freeNext(); |
| index = blockSize - 1; |
| addr = blockAddr.addOffsetTo(index*objectMonitorTypeSize); |
| } |
| index --; |
| return new ObjectMonitor(addr); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| private ObjectMonitor block; |
| private int index; |
| private Address blockAddr; |
| } |
| |
| private static Address gBlockListAddr; |
| private static int blockSize; |
| private static long objectMonitorTypeSize; |
| |
| } |