--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.graph/src/org/graalvm/compiler/graph/iterators/NodeIterable.java	2016-12-09 00:48:32.054788906 -0800
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2011, 2012, 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.graph.iterators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+
+import org.graalvm.compiler.graph.Node;
+
+public interface NodeIterable<T extends Node> extends Iterable<T> {
+
+    @SuppressWarnings("unchecked")
+    default <F extends T> NodeIterable<F> filter(Class<F> clazz) {
+        return (NodeIterable<F>) new FilteredNodeIterable<>(this).and(NodePredicates.isA(clazz));
+    }
+
+    default FilteredNodeIterable<T> filter(NodePredicate predicate) {
+        return new FilteredNodeIterable<>(this).and(predicate);
+    }
+
+    default List<T> snapshot() {
+        ArrayList<T> list = new ArrayList<>();
+        snapshotTo(list);
+        return list;
+    }
+
+    default void snapshotTo(Collection<? super T> to) {
+        for (T n : this) {
+            to.add(n);
+        }
+    }
+
+    default T first() {
+        Iterator<T> iterator = iterator();
+        if (iterator.hasNext()) {
+            return iterator.next();
+        }
+        return null;
+    }
+
+    default int count() {
+        int count = 0;
+        Iterator<T> iterator = iterator();
+        while (iterator.hasNext()) {
+            iterator.next();
+            count++;
+        }
+        return count;
+    }
+
+    default boolean isEmpty() {
+        return !iterator().hasNext();
+    }
+
+    default boolean isNotEmpty() {
+        return iterator().hasNext();
+    }
+
+    default boolean contains(T node) {
+        for (T next : this) {
+            if (next == node) {
+                return true;
+            }
+        }
+        return false;
+    }
+}