--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/AccessMonitorNode.java	2017-02-15 17:07:34.883094699 -0800
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2009, 2015, 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 org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.nodeinfo.InputType;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.DeoptimizingNode;
+import org.graalvm.compiler.nodes.FrameState;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.memory.AbstractMemoryCheckpoint;
+import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
+
+import jdk.vm.ci.code.BailoutException;
+
+/**
+ * The {@code AccessMonitorNode} is the base class of both monitor acquisition and release.
+ * <p>
+ * The Java bytecode specification allows non-balanced locking. Graal does not handle such cases and
+ * throws a {@link BailoutException} instead during graph building.
+ */
+@NodeInfo(allowedUsageTypes = {InputType.Memory})
+public abstract class AccessMonitorNode extends AbstractMemoryCheckpoint implements MemoryCheckpoint, DeoptimizingNode.DeoptBefore, DeoptimizingNode.DeoptAfter {
+
+    public static final NodeClass<AccessMonitorNode> TYPE = NodeClass.create(AccessMonitorNode.class);
+    @OptionalInput(InputType.State) FrameState stateBefore;
+    @Input ValueNode object;
+    @Input(InputType.Association) MonitorIdNode monitorId;
+
+    @Override
+    public boolean canDeoptimize() {
+        return true;
+    }
+
+    @Override
+    public FrameState stateBefore() {
+        return stateBefore;
+    }
+
+    @Override
+    public void setStateBefore(FrameState f) {
+        updateUsages(stateBefore, f);
+        stateBefore = f;
+    }
+
+    public ValueNode object() {
+        return object;
+    }
+
+    public MonitorIdNode getMonitorId() {
+        return monitorId;
+    }
+
+    /**
+     * Creates a new AccessMonitor instruction.
+     *
+     * @param object the instruction producing the object
+     */
+    protected AccessMonitorNode(NodeClass<? extends AccessMonitorNode> c, ValueNode object, MonitorIdNode monitorId) {
+        super(c, StampFactory.forVoid());
+        this.object = object;
+        this.monitorId = monitorId;
+    }
+}