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ObjectMonitor.java
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ObjectMonitor.java
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/*
* Copyright (c) 2001, 2021, 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.debugger.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;
public class ObjectMonitor extends VMObject {
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 {
heap = VM.getVM().getObjectHeap();
Type type = db.lookupType("ObjectMonitor");
sun.jvm.hotspot.types.Field f = type.getField("_header");
headerFieldOffset = f.getOffset();
f = type.getField("_object");
objectFieldOffset = f.getOffset();
f = type.getField("_owner");
ownerFieldOffset = f.getOffset();
f = type.getField("_next_om");
nextOMFieldOffset = f.getOffset();
contentionsField = new CIntField(type.getCIntegerField("_contentions"), 0);
waitersField = new CIntField(type.getCIntegerField("_waiters"), 0);
recursionsField = type.getCIntegerField("_recursions");
}
public ObjectMonitor(Address addr) {
super(addr);
}
public Mark header() {
return new Mark(addr.addOffsetTo(headerFieldOffset));
}
// FIXME
// void set_header(markWord hdr);
// FIXME: must implement and delegate to platform-dependent implementation
// public boolean isBusy();
public boolean isEntered(sun.jvm.hotspot.runtime.Thread current) {
Address o = owner();
if (current.threadObjectAddress().equals(o) ||
current.isLockOwned(o)) {
return true;
}
return false;
}
public Address owner() { return addr.getAddressAt(ownerFieldOffset); }
// FIXME
// void set_owner(void* owner);
public int waiters() { return (int)waitersField.getValue(this); }
public Address nextOM() { return addr.getAddressAt(nextOMFieldOffset); }
// FIXME
// void set_queue(void* owner);
public long recursions() { return recursionsField.getValue(addr); }
public OopHandle object() {
Address objAddr = addr.getAddressAt(objectFieldOffset);
if (objAddr == null) {
return null;
}
return objAddr.getOopHandleAt(0);
}
public int contentions() {
return (int)contentionsField.getValue(this);
}
// The following four either aren't expressed as typed fields in
// vmStructs.cpp because they aren't strongly typed in the VM, or
// would confuse the SA's type system.
private static ObjectHeap heap;
private static long headerFieldOffset;
private static long objectFieldOffset;
private static long ownerFieldOffset;
private static long nextOMFieldOffset;
private static CIntField contentionsField;
private static CIntField waitersField;
private static CIntegerField recursionsField;
// FIXME: expose platform-dependent stuff
}