--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/virtual/LockState.java	2016-12-09 00:56:05.895794240 -0800
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2011, 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 org.graalvm.compiler.nodes.virtual;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import org.graalvm.compiler.nodes.java.MonitorIdNode;
+
+/**
+ * The class implements a simple linked list of MonitorIdNodes, which can be used to describe the
+ * current lock state of an object.
+ */
+public final class LockState {
+
+    public final MonitorIdNode monitorId;
+    public final LockState next;
+
+    public LockState(MonitorIdNode monitorId, LockState next) {
+        this.monitorId = monitorId;
+        this.next = next;
+    }
+
+    @Override
+    public String toString() {
+        return monitorId.getLockDepth() + (next == null ? "" : "," + next);
+    }
+
+    public static List<MonitorIdNode> asList(LockState state) {
+        if (state == null) {
+            return Collections.emptyList();
+        } else {
+            ArrayList<MonitorIdNode> result = new ArrayList<>();
+            LockState a = state;
+            do {
+                result.add(a.monitorId);
+                a = a.next;
+            } while (a != null);
+            return result;
+        }
+    }
+}