--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/ObjectMonitor.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2001, 2014, 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.*;
+
+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("FreeNext");
+    FreeNextFieldOffset = f.getOffset();
+    countField  = type.getJIntField("_count");
+    waitersField = type.getJIntField("_waiters");
+    recursionsField = type.getCIntegerField("_recursions");
+  }
+
+  public ObjectMonitor(Address addr) {
+    super(addr);
+  }
+
+  public Mark header() {
+    return new Mark(addr.addOffsetTo(headerFieldOffset));
+  }
+
+  // FIXME
+  //  void      set_header(markOop 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 waitersField.getValue(addr); }
+
+  public Address freeNext() { return addr.getAddressAt(FreeNextFieldOffset); }
+  // FIXME
+  //  void      set_queue(void* owner);
+
+  public int count() { return countField.getValue(addr); }
+  // FIXME
+  //  void      set_count(int count);
+
+  public long recursions() { return recursionsField.getValue(addr); }
+
+  public OopHandle object() {
+    return addr.getOopHandleAt(objectFieldOffset);
+  }
+
+  // contentions is always equal to count
+  public int contentions() {
+      return count();
+  }
+
+  // FIXME
+  //  void*     object_addr();
+  //  void      set_object(void* obj);
+
+  // 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          FreeNextFieldOffset;
+  private static JIntField     countField;
+  private static JIntField     waitersField;
+  private static CIntegerField recursionsField;
+  // FIXME: expose platform-dependent stuff
+}