--- /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/VoidStamp.java	2016-12-07 13:48:05.027733800 -0800
@@ -0,0 +1,127 @@
+/*
+ * 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 org.graalvm.compiler.core.common.LIRKind;
+import org.graalvm.compiler.core.common.spi.LIRKindTool;
+import org.graalvm.compiler.debug.GraalError;
+
+import jdk.vm.ci.meta.Constant;
+import jdk.vm.ci.meta.JavaKind;
+import jdk.vm.ci.meta.MemoryAccessProvider;
+import jdk.vm.ci.meta.MetaAccessProvider;
+import jdk.vm.ci.meta.ResolvedJavaType;
+
+/**
+ * Singleton stamp representing the value of type {@code void}.
+ */
+public final class VoidStamp extends Stamp {
+
+    private VoidStamp() {
+    }
+
+    @Override
+    public Stamp unrestricted() {
+        return this;
+    }
+
+    @Override
+    public JavaKind getStackKind() {
+        return JavaKind.Void;
+    }
+
+    @Override
+    public Stamp improveWith(Stamp other) {
+        assert other instanceof VoidStamp;
+        return this;
+    }
+
+    @Override
+    public LIRKind getLIRKind(LIRKindTool tool) {
+        throw GraalError.shouldNotReachHere("void stamp has no value");
+    }
+
+    @Override
+    public ResolvedJavaType javaType(MetaAccessProvider metaAccess) {
+        return metaAccess.lookupJavaType(Void.TYPE);
+    }
+
+    @Override
+    public String toString() {
+        return "void";
+    }
+
+    @Override
+    public boolean alwaysDistinct(Stamp other) {
+        return this != other;
+    }
+
+    @Override
+    public Stamp meet(Stamp other) {
+        assert other instanceof VoidStamp;
+        return this;
+    }
+
+    @Override
+    public Stamp join(Stamp other) {
+        assert other instanceof VoidStamp;
+        return this;
+    }
+
+    @Override
+    public boolean isCompatible(Stamp stamp) {
+        return stamp instanceof VoidStamp;
+    }
+
+    @Override
+    public boolean isCompatible(Constant constant) {
+        return false;
+    }
+
+    @Override
+    public Stamp empty() {
+        // the void stamp is always empty
+        return this;
+    }
+
+    @Override
+    public boolean hasValues() {
+        return false;
+    }
+
+    @Override
+    public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {
+        throw GraalError.shouldNotReachHere("can't read values of void stamp");
+    }
+
+    @Override
+    public Stamp constant(Constant c, MetaAccessProvider meta) {
+        throw GraalError.shouldNotReachHere("void stamp has no value");
+    }
+
+    private static final VoidStamp instance = new VoidStamp();
+
+    static VoidStamp getInstance() {
+        return instance;
+    }
+}