--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/nodes/PureFunctionMacroNode.java	2017-02-15 17:09:18.484630524 -0800
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2013, 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.replacements.nodes;
+
+import org.graalvm.compiler.core.common.type.StampPair;
+import org.graalvm.compiler.graph.Node;
+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.CallTargetNode.InvokeKind;
+import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.ValueNode;
+
+import jdk.vm.ci.meta.JavaConstant;
+import jdk.vm.ci.meta.MetaAccessProvider;
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+
+/**
+ * This node class can be used to create {@link MacroNode}s for simple pure functions like
+ * {@link System#identityHashCode(Object)}.
+ */
+@NodeInfo
+public abstract class PureFunctionMacroNode extends MacroStateSplitNode implements Canonicalizable {
+
+    public static final NodeClass<PureFunctionMacroNode> TYPE = NodeClass.create(PureFunctionMacroNode.class);
+
+    public PureFunctionMacroNode(NodeClass<? extends MacroNode> c, InvokeKind invokeKind, ResolvedJavaMethod targetMethod, int bci, StampPair returnStamp, ValueNode... arguments) {
+        super(c, invokeKind, targetMethod, bci, returnStamp, arguments);
+    }
+
+    /**
+     * This method should return either a constant that represents the result of the function, or
+     * null if no such result could be determined.
+     */
+    protected abstract JavaConstant evaluate(JavaConstant param, MetaAccessProvider metaAccess);
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        if (tool.allUsagesAvailable() && hasNoUsages()) {
+            return null;
+        } else {
+            ValueNode param = arguments.get(0);
+            if (param.isConstant()) {
+                JavaConstant constant = evaluate(param.asJavaConstant(), tool.getMetaAccess());
+                if (constant != null) {
+                    return ConstantNode.forConstant(constant, tool.getMetaAccess());
+                }
+            }
+        }
+        return this;
+    }
+}