Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/runtime/ObjectSynchronizer.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/runtime/ObjectSynchronizer.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,127 @@ +/* + * Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.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; + +}