--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/AstSerializer.java	2020-04-15 18:49:39.000000000 +0530
+++ /dev/null	2020-04-15 18:49:39.000000000 +0530
@@ -1,55 +0,0 @@
-/*
- * Copyright (c) 2010, 2014, 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.runtime;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.ObjectOutputStream;
-import java.util.zip.Deflater;
-import java.util.zip.DeflaterOutputStream;
-import jdk.nashorn.internal.ir.FunctionNode;
-import jdk.nashorn.internal.runtime.options.Options;
-
-/**
- * This static utility class performs serialization of FunctionNode ASTs to a byte array.
- * The format is a standard Java serialization stream, deflated.
- */
-final class AstSerializer {
-    // Experimentally, we concluded that compression level 4 gives a good tradeoff between serialization speed
-    // and size.
-    private static final int COMPRESSION_LEVEL = Options.getIntProperty("nashorn.serialize.compression", 4);
-    static byte[] serialize(final FunctionNode fn) {
-        final ByteArrayOutputStream out = new ByteArrayOutputStream();
-        final Deflater deflater = new Deflater(COMPRESSION_LEVEL);
-        try (final ObjectOutputStream oout = new ObjectOutputStream(new DeflaterOutputStream(out, deflater))) {
-            oout.writeObject(fn);
-        } catch (final IOException e) {
-            throw new AssertionError("Unexpected exception serializing function", e);
-        } finally {
-            deflater.end();
-        }
-        return out.toByteArray();
-    }
-}