--- /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/calc/IsNullNode.java	2016-12-09 00:55:17.310652674 -0800
@@ -0,0 +1,134 @@
+/*
+ * 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.calc;
+
+import org.graalvm.compiler.core.common.type.AbstractPointerStamp;
+import org.graalvm.compiler.core.common.type.ObjectStamp;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.nodeinfo.NodeCycles;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.LogicConstantNode;
+import org.graalvm.compiler.nodes.LogicNode;
+import org.graalvm.compiler.nodes.PiNode;
+import org.graalvm.compiler.nodes.UnaryOpLogicNode;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.spi.LIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+import org.graalvm.compiler.nodes.spi.PiPushable;
+import org.graalvm.compiler.nodes.spi.Virtualizable;
+import org.graalvm.compiler.nodes.spi.VirtualizerTool;
+import org.graalvm.compiler.nodes.type.StampTool;
+
+import jdk.vm.ci.meta.TriState;
+
+/**
+ * An IsNullNode will be true if the supplied value is null, and false if it is non-null.
+ */
+@NodeInfo(cycles = NodeCycles.CYCLES_2)
+public final class IsNullNode extends UnaryOpLogicNode implements LIRLowerable, Virtualizable, PiPushable {
+
+    public static final NodeClass<IsNullNode> TYPE = NodeClass.create(IsNullNode.class);
+
+    public IsNullNode(ValueNode object) {
+        super(TYPE, object);
+        assert object != null;
+    }
+
+    public static LogicNode create(ValueNode forValue) {
+        LogicNode result = tryCanonicalize(forValue);
+        return result == null ? new IsNullNode(forValue) : result;
+    }
+
+    public static LogicNode tryCanonicalize(ValueNode forValue) {
+        if (StampTool.isPointerAlwaysNull(forValue)) {
+            return LogicConstantNode.tautology();
+        } else if (StampTool.isPointerNonNull(forValue)) {
+            return LogicConstantNode.contradiction();
+        }
+        return null;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        // Nothing to do.
+    }
+
+    @Override
+    public boolean verify() {
+        assertTrue(getValue() != null, "is null input must not be null");
+        assertTrue(getValue().stamp() instanceof AbstractPointerStamp, "input must be a pointer not %s", getValue().stamp());
+        return super.verify();
+    }
+
+    @Override
+    public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
+        LogicNode result = tryCanonicalize(forValue);
+        return result == null ? this : result;
+    }
+
+    @Override
+    public void virtualize(VirtualizerTool tool) {
+        ValueNode alias = tool.getAlias(getValue());
+        TriState fold = tryFold(alias.stamp());
+        if (fold != TriState.UNKNOWN) {
+            tool.replaceWithValue(LogicConstantNode.forBoolean(fold.isTrue(), graph()));
+        }
+    }
+
+    @Override
+    public boolean push(PiNode parent) {
+        if (parent.stamp() instanceof ObjectStamp && parent.object().stamp() instanceof ObjectStamp) {
+            ObjectStamp piStamp = (ObjectStamp) parent.stamp();
+            ObjectStamp piValueStamp = (ObjectStamp) parent.object().stamp();
+            if (piStamp.nonNull() == piValueStamp.nonNull() && piStamp.alwaysNull() == piValueStamp.alwaysNull()) {
+                replaceFirstInput(parent, parent.object());
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @NodeIntrinsic
+    public static native IsNullNode isNull(Object object);
+
+    @Override
+    public Stamp getSucceedingStampForValue(boolean negated) {
+        return negated ? getValue().stamp().join(StampFactory.objectNonNull()) : StampFactory.alwaysNull();
+    }
+
+    @Override
+    public TriState tryFold(Stamp valueStamp) {
+        if (valueStamp instanceof ObjectStamp) {
+            ObjectStamp objectStamp = (ObjectStamp) valueStamp;
+            if (objectStamp.alwaysNull()) {
+                return TriState.TRUE;
+            } else if (objectStamp.nonNull()) {
+                return TriState.FALSE;
+            }
+        }
+        return TriState.UNKNOWN;
+    }
+}