--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/AbstractPointerStamp.java	2016-12-09 00:47:14.093353306 -0800
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2014, 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.core.common.type;
+
+import jdk.vm.ci.meta.Constant;
+import jdk.vm.ci.meta.JavaConstant;
+import jdk.vm.ci.meta.JavaKind;
+
+/**
+ * Abstract base class of all pointer types.
+ */
+public abstract class AbstractPointerStamp extends Stamp {
+
+    private final boolean nonNull;
+    private final boolean alwaysNull;
+
+    protected AbstractPointerStamp(boolean nonNull, boolean alwaysNull) {
+        this.nonNull = nonNull;
+        this.alwaysNull = alwaysNull;
+    }
+
+    public boolean nonNull() {
+        assert !this.isEmpty() || nonNull;
+        return nonNull;
+    }
+
+    public boolean alwaysNull() {
+        return alwaysNull;
+    }
+
+    protected abstract AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull);
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (alwaysNull ? 1231 : 1237);
+        result = prime * result + (nonNull ? 1231 : 1237);
+        return result;
+    }
+
+    @Override
+    public Stamp join(Stamp stamp) {
+        AbstractPointerStamp other = (AbstractPointerStamp) stamp;
+        boolean joinNonNull = this.nonNull || other.nonNull;
+        boolean joinAlwaysNull = this.alwaysNull || other.alwaysNull;
+        if (joinNonNull && joinAlwaysNull) {
+            return empty();
+        } else {
+            return copyWith(joinNonNull, joinAlwaysNull);
+        }
+    }
+
+    @Override
+    public Stamp improveWith(Stamp other) {
+        return join(other);
+    }
+
+    @Override
+    public Stamp meet(Stamp stamp) {
+        AbstractPointerStamp other = (AbstractPointerStamp) stamp;
+        boolean meetNonNull = this.nonNull && other.nonNull;
+        boolean meetAlwaysNull = this.alwaysNull && other.alwaysNull;
+        return copyWith(meetNonNull, meetAlwaysNull);
+    }
+
+    @Override
+    public Stamp unrestricted() {
+        return copyWith(false, false);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+        AbstractPointerStamp other = (AbstractPointerStamp) obj;
+        return this.alwaysNull == other.alwaysNull && this.nonNull == other.nonNull;
+    }
+
+    @Override
+    public Constant asConstant() {
+        if (alwaysNull) {
+            return JavaConstant.NULL_POINTER;
+        } else {
+            return null;
+        }
+    }
+
+    @Override
+    public JavaKind getStackKind() {
+        return JavaKind.Illegal;
+    }
+}