--- /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/ArrayLengthNode.java	2017-02-15 17:07:35.205108797 -0800
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2009, 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.java;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.FixedWithNextNode;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.ValueProxyNode;
+import org.graalvm.compiler.nodes.spi.Lowerable;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+import org.graalvm.compiler.nodes.spi.ValueProxy;
+import org.graalvm.compiler.nodes.spi.Virtualizable;
+import org.graalvm.compiler.nodes.spi.VirtualizerTool;
+import org.graalvm.compiler.nodes.util.GraphUtil;
+import org.graalvm.compiler.nodes.virtual.VirtualArrayNode;
+
+import jdk.vm.ci.meta.ConstantReflectionProvider;
+import jdk.vm.ci.meta.JavaConstant;
+
+/**
+ * The {@code ArrayLength} instruction gets the length of an array.
+ */
+@NodeInfo(cycles = CYCLES_2, size = SIZE_1)
+public final class ArrayLengthNode extends FixedWithNextNode implements Canonicalizable.Unary<ValueNode>, Lowerable, Virtualizable {
+
+    public static final NodeClass<ArrayLengthNode> TYPE = NodeClass.create(ArrayLengthNode.class);
+    @Input ValueNode array;
+
+    public ValueNode array() {
+        return array;
+    }
+
+    @Override
+    public ValueNode getValue() {
+        return array;
+    }
+
+    public ArrayLengthNode(ValueNode array) {
+        super(TYPE, StampFactory.positiveInt());
+        this.array = array;
+    }
+
+    public static ValueNode create(ValueNode forValue, ConstantReflectionProvider constantReflection) {
+        if (forValue instanceof NewArrayNode) {
+            NewArrayNode newArray = (NewArrayNode) forValue;
+            return newArray.length();
+        }
+
+        ValueNode length = readArrayLengthConstant(forValue, constantReflection);
+        if (length != null) {
+            return length;
+        }
+        return new ArrayLengthNode(forValue);
+    }
+
+    @Override
+    public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
+        ValueNode length = readArrayLength(forValue, tool.getConstantReflection());
+        if (length != null) {
+            return length;
+        }
+        return this;
+    }
+
+    /**
+     * Replicate the {@link ValueProxyNode}s from {@code originalValue} onto {@code value}.
+     *
+     * @param originalValue a possibly proxied value
+     * @param value a value needing proxies
+     * @return proxies wrapping {@code value}
+     */
+    private static ValueNode reproxyValue(ValueNode originalValue, ValueNode value) {
+        if (value.isConstant()) {
+            // No proxy needed
+            return value;
+        }
+        if (originalValue instanceof ValueProxyNode) {
+            ValueProxyNode proxy = (ValueProxyNode) originalValue;
+            return new ValueProxyNode(reproxyValue(proxy.getOriginalNode(), value), proxy.proxyPoint());
+        } else if (originalValue instanceof ValueProxy) {
+            ValueProxy proxy = (ValueProxy) originalValue;
+            return reproxyValue(proxy.getOriginalNode(), value);
+        } else {
+            return value;
+        }
+    }
+
+    /**
+     * Gets the length of an array if possible.
+     *
+     * @return a node representing the length of {@code array} or null if it is not available
+     */
+    public static ValueNode readArrayLength(ValueNode originalArray, ConstantReflectionProvider constantReflection) {
+        ValueNode length = GraphUtil.arrayLength(originalArray);
+        if (length != null) {
+            // Ensure that any proxies on the original value end up on the length value
+            return reproxyValue(originalArray, length);
+        }
+        return readArrayLengthConstant(originalArray, constantReflection);
+    }
+
+    private static ValueNode readArrayLengthConstant(ValueNode originalArray, ConstantReflectionProvider constantReflection) {
+        ValueNode array = GraphUtil.unproxify(originalArray);
+        if (constantReflection != null && array.isConstant() && !array.isNullConstant()) {
+            JavaConstant constantValue = array.asJavaConstant();
+            if (constantValue != null && constantValue.isNonNull()) {
+                Integer constantLength = constantReflection.readArrayLength(constantValue);
+                if (constantLength != null) {
+                    return ConstantNode.forInt(constantLength);
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public void lower(LoweringTool tool) {
+        tool.getLowerer().lower(this, tool);
+    }
+
+    @NodeIntrinsic
+    public static native int arrayLength(Object array);
+
+    @Override
+    public void virtualize(VirtualizerTool tool) {
+        ValueNode alias = tool.getAlias(array());
+        if (alias instanceof VirtualArrayNode) {
+            VirtualArrayNode virtualArray = (VirtualArrayNode) alias;
+            tool.replaceWithValue(ConstantNode.forInt(virtualArray.entryCount(), graph()));
+        }
+    }
+}