--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes.test/src/org/graalvm/compiler/nodes/test/AbstractObjectStampTest.java	2017-02-15 17:06:23.957991581 -0800
@@ -0,0 +1,253 @@
+/*
+ * 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.nodes.test;
+
+import org.junit.Assert;
+
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.TypeReference;
+import org.graalvm.compiler.core.test.GraalCompilerTest;
+
+public abstract class AbstractObjectStampTest extends GraalCompilerTest {
+
+    protected static class A {
+
+    }
+
+    protected static class B extends A {
+
+    }
+
+    protected static class C extends B implements I {
+
+    }
+
+    protected static class D extends A {
+
+    }
+
+    protected abstract static class E extends A {
+
+    }
+
+    protected interface I {
+
+    }
+
+    protected interface OtherI {
+
+    }
+
+    protected interface SubI1 extends I {
+
+    }
+
+    protected interface SubI2 extends I {
+
+    }
+
+    protected interface SubI3 extends I {
+
+    }
+
+    protected interface SubI4 extends SubI3, SubI1 {
+    }
+
+    protected interface SubI5 extends SubI3, OtherI {
+
+    }
+
+    protected interface SubI6 extends OtherI {
+
+    }
+
+    protected interface Base1 {
+
+    }
+
+    protected interface Base2 {
+
+    }
+
+    protected interface ImplOrder1 extends Base1, Base2 {
+
+    }
+
+    protected interface ImplOrder2 extends Base2, Base1 {
+
+    }
+
+    /* Example of a deep interface hierarchy. */
+
+    protected interface I45 {
+
+    }
+
+    protected interface I46 {
+
+    }
+
+    protected interface I41 extends I45 {
+
+    }
+
+    protected interface I42 extends I45 {
+
+    }
+
+    protected interface I43 extends I46 {
+
+    }
+
+    protected interface I44 extends I46 {
+
+    }
+
+    protected interface I35 extends I41, I42 {
+
+    }
+
+    protected interface I36 extends I43, I44 {
+
+    }
+
+    protected interface I31 extends I35 {
+
+    }
+
+    protected interface I32 extends I35 {
+
+    }
+
+    protected interface I33 extends I36 {
+
+    }
+
+    protected interface I34 extends I36 {
+
+    }
+
+    protected interface I25 extends I31, I32 {
+
+    }
+
+    protected interface I26 extends I33, I34 {
+
+    }
+
+    protected interface I21 extends I25 {
+
+    }
+
+    protected interface I22 extends I25 {
+
+    }
+
+    protected interface I23 extends I26 {
+
+    }
+
+    protected interface I24 extends I26 {
+
+    }
+
+    protected interface I15 extends I21, I22 {
+
+    }
+
+    protected interface I16 extends I23, I24 {
+
+    }
+
+    protected interface I11 extends I15 {
+
+    }
+
+    protected interface I12 extends I15 {
+
+    }
+
+    protected interface I13 extends I16 {
+
+    }
+
+    protected interface I14 extends I16 {
+
+    }
+
+    protected interface I5 extends I11, I12 {
+
+    }
+
+    protected interface I6 extends I13, I14 {
+
+    }
+
+    protected interface I1 extends I5 {
+
+    }
+
+    protected interface I2 extends I5 {
+
+    }
+
+    protected interface I3 extends I6 {
+
+    }
+
+    protected interface I4 extends I6 {
+
+    }
+
+    protected interface Deep1 extends I1, I2 {
+
+    }
+
+    protected interface Deep2 extends I3, I4 {
+
+    }
+
+    /**
+     * Joins the two stamps and also asserts that the meet operation is commutative.
+     */
+    protected static Stamp join(Stamp a, Stamp b) {
+        Stamp ab = a.join(b);
+        Stamp ba = b.join(a);
+        Assert.assertEquals(ab, ba);
+        return ab;
+    }
+
+    /**
+     * Meets the two stamps and also asserts that the meet operation is commutative.
+     */
+    protected static Stamp meet(Stamp a, Stamp b) {
+        Stamp ab = a.meet(b);
+        Stamp ba = b.meet(a);
+        Assert.assertEquals(ab, ba);
+        return ab;
+    }
+
+    protected TypeReference getType(Class<?> clazz) {
+        return TypeReference.createTrustedWithoutAssumptions(getMetaAccess().lookupJavaType(clazz));
+    }
+}