--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/memory/AbstractWriteNode.java	Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 2011, 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.memory;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_3;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
+
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.nodeinfo.InputType;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.FrameState;
+import org.graalvm.compiler.nodes.StateSplit;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.ValueNodeUtil;
+import org.graalvm.compiler.nodes.extended.GuardingNode;
+import org.graalvm.compiler.nodes.memory.address.AddressNode;
+
+@NodeInfo(allowedUsageTypes = {InputType.Memory, InputType.Guard}, cycles = CYCLES_3, size = SIZE_1)
+public abstract class AbstractWriteNode extends FixedAccessNode implements StateSplit, MemoryCheckpoint.Single, MemoryAccess, GuardingNode {
+
+    public static final NodeClass<AbstractWriteNode> TYPE = NodeClass.create(AbstractWriteNode.class);
+    @Input ValueNode value;
+    @OptionalInput(InputType.State) FrameState stateAfter;
+    @OptionalInput(InputType.Memory) Node lastLocationAccess;
+
+    protected final boolean initialization;
+
+    @Override
+    public FrameState stateAfter() {
+        return stateAfter;
+    }
+
+    @Override
+    public void setStateAfter(FrameState x) {
+        assert x == null || x.isAlive() : "frame state must be in a graph";
+        updateUsages(stateAfter, x);
+        stateAfter = x;
+    }
+
+    @Override
+    public boolean hasSideEffect() {
+        return true;
+    }
+
+    public ValueNode value() {
+        return value;
+    }
+
+    /**
+     * Returns whether this write is the initialization of the written location. If it is true, the
+     * old value of the memory location is either uninitialized or zero. If it is false, the memory
+     * location is guaranteed to contain a valid value or zero.
+     */
+    public boolean isInitialization() {
+        return initialization;
+    }
+
+    protected AbstractWriteNode(NodeClass<? extends AbstractWriteNode> c, AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) {
+        this(c, address, location, value, barrierType, false);
+    }
+
+    protected AbstractWriteNode(NodeClass<? extends AbstractWriteNode> c, AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType, boolean initialization) {
+        super(c, address, location, StampFactory.forVoid(), barrierType);
+        this.value = value;
+        this.initialization = initialization;
+    }
+
+    protected AbstractWriteNode(NodeClass<? extends AbstractWriteNode> c, AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType, GuardingNode guard,
+                    boolean initialization) {
+        super(c, address, location, StampFactory.forVoid(), guard, barrierType, false, null);
+        this.value = value;
+        this.initialization = initialization;
+    }
+
+    @Override
+    public boolean isAllowedUsageType(InputType type) {
+        return (type == InputType.Guard && getNullCheck()) ? true : super.isAllowedUsageType(type);
+    }
+
+    @Override
+    public MemoryNode getLastLocationAccess() {
+        return (MemoryNode) lastLocationAccess;
+    }
+
+    @Override
+    public void setLastLocationAccess(MemoryNode lla) {
+        Node newLla = ValueNodeUtil.asNode(lla);
+        updateUsages(lastLocationAccess, newLla);
+        lastLocationAccess = newLla;
+    }
+}