--- /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/java/MonitorEnterNode.java	2016-12-09 00:55:49.869087807 -0800
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2009, 2016, 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.java;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_100;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_100;
+
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.graph.IterableNodeType;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.extended.MonitorEnter;
+import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
+import org.graalvm.compiler.nodes.spi.Lowerable;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+import org.graalvm.compiler.nodes.spi.Virtualizable;
+import org.graalvm.compiler.nodes.spi.VirtualizerTool;
+import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
+
+/**
+ * The {@code MonitorEnterNode} represents the acquisition of a monitor.
+ */
+@NodeInfo(cycles = CYCLES_100, size = SIZE_100)
+public class MonitorEnterNode extends AccessMonitorNode implements Virtualizable, Lowerable, IterableNodeType, MonitorEnter, MemoryCheckpoint.Single {
+
+    public static final NodeClass<MonitorEnterNode> TYPE = NodeClass.create(MonitorEnterNode.class);
+
+    public MonitorEnterNode(ValueNode object, MonitorIdNode monitorId) {
+        this(TYPE, object, monitorId);
+    }
+
+    public MonitorEnterNode(NodeClass<? extends MonitorEnterNode> c, ValueNode object, MonitorIdNode monitorId) {
+        super(c, object, monitorId);
+    }
+
+    @Override
+    public LocationIdentity getLocationIdentity() {
+        return LocationIdentity.any();
+    }
+
+    @Override
+    public void lower(LoweringTool tool) {
+        tool.getLowerer().lower(this, tool);
+    }
+
+    @Override
+    public void virtualize(VirtualizerTool tool) {
+        ValueNode alias = tool.getAlias(object());
+        if (alias instanceof VirtualObjectNode) {
+            VirtualObjectNode virtual = (VirtualObjectNode) alias;
+            if (virtual.hasIdentity()) {
+                tool.addLock(virtual, getMonitorId());
+                tool.delete();
+            }
+        }
+    }
+}