--- old/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/ir/LoopNode.java	2020-04-15 18:47:58.000000000 +0530
+++ /dev/null	2020-04-15 18:47:58.000000000 +0530
@@ -1,186 +0,0 @@
-/*
- * 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;
-
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import jdk.nashorn.internal.codegen.Label;
-
-/**
- * A loop node, for example a while node, do while node or for node
- */
-public abstract class LoopNode extends BreakableStatement {
-    private static final long serialVersionUID = 1L;
-
-    /** loop continue label. */
-    protected final Label continueLabel;
-
-    /** Loop test node, null if infinite */
-    protected final JoinPredecessorExpression test;
-
-    /** Loop body */
-    protected final Block body;
-
-    /** Can control flow escape from loop, e.g. through breaks or continues to outer loops? */
-    protected final boolean controlFlowEscapes;
-
-    /**
-     * Constructor
-     *
-     * @param lineNumber         lineNumber
-     * @param token              token
-     * @param finish             finish
-     * @param body               loop body
-     * @param test               test
-     * @param controlFlowEscapes controlFlowEscapes
-     */
-    protected LoopNode(final int lineNumber, final long token, final int finish, final Block body, final JoinPredecessorExpression test, final boolean controlFlowEscapes) {
-        super(lineNumber, token, finish, new Label("while_break"));
-        this.continueLabel = new Label("while_continue");
-        this.body = body;
-        this.controlFlowEscapes = controlFlowEscapes;
-        this.test = test;
-    }
-
-    /**
-     * Constructor
-     *
-     * @param loopNode loop node
-     * @param test     new test
-     * @param body     new body
-     * @param controlFlowEscapes controlFlowEscapes
-     * @param conversion the local variable conversion carried by this loop node.
-     */
-    protected LoopNode(final LoopNode loopNode, final JoinPredecessorExpression test, final Block body,
-            final boolean controlFlowEscapes, final LocalVariableConversion conversion) {
-        super(loopNode, conversion);
-        this.continueLabel = new Label(loopNode.continueLabel);
-        this.test = test;
-        this.body = body;
-        this.controlFlowEscapes = controlFlowEscapes;
-    }
-
-    @Override
-    public abstract Node ensureUniqueLabels(final LexicalContext lc);
-
-    /**
-     * Does the control flow escape from this loop, i.e. through breaks or
-     * continues to outer loops?
-     * @return true if control flow escapes
-     */
-    public boolean controlFlowEscapes() {
-        return controlFlowEscapes;
-    }
-
-
-    @Override
-    public boolean isTerminal() {
-        if (!mustEnter()) {
-            return false;
-        }
-        //must enter but control flow may escape - then not terminal
-        if (controlFlowEscapes) {
-            return false;
-        }
-        //must enter, but body ends with return - then terminal
-        if (body.isTerminal()) {
-            return true;
-        }
-        //no breaks or returns, it is still terminal if we can never exit
-        return test == null;
-    }
-
-    /**
-     * Conservative check: does this loop have to be entered?
-     * @return true if body will execute at least once
-     */
-    public abstract boolean mustEnter();
-
-    /**
-     * Get the continue label for this while node, i.e. location to go to on continue
-     * @return continue label
-     */
-    public Label getContinueLabel() {
-        return continueLabel;
-    }
-
-    @Override
-    public List<Label> getLabels() {
-        return Collections.unmodifiableList(Arrays.asList(breakLabel, continueLabel));
-    }
-
-    @Override
-    public boolean isLoop() {
-        return true;
-    }
-
-    /**
-     * Get the body for this for node
-     * @return the body
-     */
-    public abstract Block getBody();
-
-    /**
-     * @param lc   lexical context
-     * @param body new body
-     * @return new for node if changed or existing if not
-     */
-    public abstract LoopNode setBody(final LexicalContext lc, final Block body);
-
-    /**
-     * Get the test for this for node
-     * @return the test
-     */
-    public final JoinPredecessorExpression getTest() {
-        return test;
-    }
-
-    /**
-     * Set the test for this for node
-     *
-     * @param lc lexical context
-     * @param test new test
-     * @return same or new node depending on if test was changed
-     */
-    public abstract LoopNode setTest(final LexicalContext lc, final JoinPredecessorExpression test);
-
-    /**
-     * Set the control flow escapes flag for this node.
-     * TODO  - integrate this with Lowering in a better way
-     *
-     * @param lc lexical context
-     * @param controlFlowEscapes control flow escapes value
-     * @return new loop node if changed otherwise the same
-     */
-    public abstract LoopNode setControlFlowEscapes(final LexicalContext lc, final boolean controlFlowEscapes);
-
-    /**
-     * Does this loop have a LET declaration and hence require a per-iteration scope?
-     * @return true if a per-iteration scope is required.
-     */
-    public abstract boolean hasPerIterationScope();
-}