--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/NonNullParametersPhase.java	2017-02-15 17:08:12.639747728 -0800
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2013, 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.phases.common;
+
+import org.graalvm.compiler.core.common.type.ObjectStamp;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.nodes.ParameterNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.phases.Phase;
+
+/**
+ * Modifies the stamp of all object {@linkplain ParameterNode parameters} in a graph to denote they
+ * are non-null. This can be used for graphs where the caller null checks all arguments.
+ */
+public class NonNullParametersPhase extends Phase {
+
+    @Override
+    protected void run(StructuredGraph graph) {
+        Stamp nonNull = StampFactory.objectNonNull();
+        for (ParameterNode param : graph.getNodes(ParameterNode.TYPE)) {
+            if (param.stamp() instanceof ObjectStamp) {
+                ObjectStamp paramStamp = (ObjectStamp) param.stamp();
+                param.setStamp(paramStamp.join(nonNull));
+            }
+        }
+    }
+}