--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/BasicObjectLock.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2001, 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.types.*;
+
+public class BasicObjectLock 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 {
+    Type type  = db.lookupType("BasicObjectLock");
+    lockField  = type.getField("_lock");
+    objField   = type.getOopField("_obj");
+    size       = (int) type.getSize();
+  }
+
+  private static sun.jvm.hotspot.types.Field    lockField;
+  private static sun.jvm.hotspot.types.OopField objField;
+  private static int        size;
+
+  public BasicObjectLock(Address addr) {
+    super(addr);
+  }
+
+  public OopHandle obj()  { return objField.getValue(addr); }
+  public BasicLock lock() { return new BasicLock(addr.addOffsetTo(lockField.getOffset())); }
+
+  /** Note: Use frame::interpreter_frame_monitor_size() for the size
+      of BasicObjectLocks in interpreter activation frames since it
+      includes machine-specific padding. This routine returns a size
+      in BYTES in this system! */
+  public static int size() { return size; }
+
+  /** Helper routine for Frames (also probably needed for iteration) */
+  public Address address() { return addr; }
+}