--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/SharedPropertyMap.java	2020-04-15 18:50:10.000000000 +0530
+++ /dev/null	2020-04-15 18:50:10.000000000 +0530
@@ -1,83 +0,0 @@
-/*
- * Copyright (c) 2015, 2019, 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.lang.invoke.SwitchPoint;
-
-/**
- * This class represents a property map that can be shared among multiple prototype objects, allowing all inheriting
- * top-level objects to also share one property map. This class is only used for prototype objects, the
- * top-level objects use ordinary {@link PropertyMap}s with the {@link PropertyMap#sharedProtoMap} field
- * set to the expected shared prototype map.
- *
- * <p>When an instance of this class is evolved because a property is added, removed, or modified in an object
- * using it, the {@link #invalidateSwitchPoint()} method is invoked to signal to all callsites and inheriting
- * objects that the assumption of a single shared prototype map is no longer valid. The property map resulting
- * from the modification will no longer be an instance of this class.</p>
- */
-public final class SharedPropertyMap extends PropertyMap {
-
-    @SuppressWarnings("serial") // Not statically typed as Serializable
-    private SwitchPoint switchPoint;
-
-    private static final long serialVersionUID = 2166297719721778876L;
-
-    /**
-     * Create a new shared property map from the given {@code map}.
-     * @param map property map to copy
-     */
-    SharedPropertyMap(final PropertyMap map) {
-        super(map);
-        this.switchPoint = new SwitchPoint();
-    }
-
-    @Override
-    public void propertyChanged(final Property property) {
-        invalidateSwitchPoint();
-        super.propertyChanged(property);
-    }
-
-    @Override
-    synchronized boolean isValidSharedProtoMap() {
-        return switchPoint != null;
-    }
-
-    @Override
-    synchronized SwitchPoint getSharedProtoSwitchPoint() {
-        return switchPoint;
-    }
-
-    /**
-     * Invalidate the shared prototype switch point if this is a shared prototype map.
-     */
-    synchronized void invalidateSwitchPoint() {
-        if (switchPoint != null) {
-            assert !switchPoint.hasBeenInvalidated();
-            SwitchPoint.invalidateAll(new SwitchPoint[]{ switchPoint });
-            switchPoint = null;
-        }
-    }
-}