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diff --git a/src/jdk/nashorn/internal/ir/Flags.java b/src/jdk/nashorn/internal/ir/Flags.java
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+/*
+ * Copyright (c) 2010, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 jdk.nashorn.internal.ir;
+
+/**
+ * Interface implemented by all nodes that have flags in
+ * a lexical context. This is needed as we sometimes have to save
+ * the setting of flags in the lexical context until a block
+ * is completely finished and its final version (after multiple
+ * copy on writes) is placed in the lexical context
+ *
+ * @param <T> lexical context node that can have flags set during code generation
+ */
+public interface Flags<T extends LexicalContextNode> {
+
+    /**
+     * Check if a flag is set in a lexical context node
+     * @param flag flag to check
+     * @return flags
+     */
+    public boolean getFlag(int flag);
+
+    /**
+     * Clear a flag of a LexicalContextNode
+     * @param lc lexical context
+     * @param flag flag to clear
+     * @return the new LexicalContext node if flags were changed, same otherwise
+     */
+    public T clearFlag(final LexicalContext lc, int flag);
+
+    /**
+     * Set a flag of a LexicalContextNode
+     * @param lc lexical context
+     * @param flag flag to set
+     * @return the new LexicalContext node if flags were changed, same otherwise
+     */
+    public T setFlag(final LexicalContext lc, int flag);
+
+    /**
+     * Set all flags of a LexicalContextNode, overwriting previous flags
+     * @param lc lexical context
+     * @param flags new flags value
+     * @return the new LexicalContext node if flags were changed, same otherwise
+     */
+    public T setFlags(final LexicalContext lc, int flags);
+}