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113 lines
3.5 KiB
Java
113 lines
3.5 KiB
Java
/*
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* Copyright (c) 2001, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package sun.jvm.hotspot.runtime;
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import java.util.*;
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import sun.jvm.hotspot.oops.*;
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import sun.jvm.hotspot.utilities.*;
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import sun.jvm.hotspot.debugger.*;
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import sun.jvm.hotspot.types.*;
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import sun.jvm.hotspot.utilities.Observable;
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import sun.jvm.hotspot.utilities.Observer;
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public class ObjectSynchronizer {
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static {
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VM.registerVMInitializedObserver(new Observer() {
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public void update(Observable o, Object data) {
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initialize(VM.getVM().getTypeDataBase());
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}
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});
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}
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private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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Type objectSynchronizerType = db.lookupType("ObjectSynchronizer");
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Type monitorListType = db.lookupType("MonitorList");
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Address monitorListAddr = objectSynchronizerType.getField("_in_use_list").getStaticFieldAddress();
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inUseListHead = monitorListType.getAddressField("_head").getAddress(monitorListAddr);
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}
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public long identityHashValueFor(Oop obj) {
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Mark mark = obj.getMark();
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if (mark.isUnlocked()) {
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// FIXME: can not generate marks in debugging system
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return mark.hash();
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} else if (mark.hasMonitor()) {
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ObjectMonitor monitor = mark.monitor();
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Mark temp = monitor.header();
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return temp.hash();
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} else {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(VM.getVM().isDebugging(), "Can not access displaced header otherwise");
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}
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if (mark.hasDisplacedMarkHelper()) {
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Mark temp = mark.displacedMarkHelper();
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return temp.hash();
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}
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// FIXME: can not do anything else here in debugging system
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return 0;
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}
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}
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public static Iterator objectMonitorIterator() {
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return new ObjectMonitorIterator();
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}
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private static class ObjectMonitorIterator implements Iterator {
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// JVMTI raw monitors are not included in _in_use_list and
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// are not returned by this Iterator.
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ObjectMonitorIterator() {
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mon = inUseListHead == null ? null : new ObjectMonitor(inUseListHead);
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}
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public boolean hasNext() {
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return (mon != null);
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}
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public Object next() {
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ObjectMonitor ret = mon;
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if (ret == null) {
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throw new NoSuchElementException();
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}
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// advance to next entry
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Address nextMon = mon.nextOM();
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mon = nextMon == null ? null : new ObjectMonitor(nextMon);
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return ret;
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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private ObjectMonitor mon;
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}
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private static Address inUseListHead;
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}
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