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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.
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 * 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.
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 * 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).
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package jdk.nashorn.internal.ir;

/**
 * Interface implemented by AST nodes that either can occur as predecessors of a control flow join, or contain a control
 * flow join themselves. JoinPredecessor only provides a getter and setter for a {@link LocalVariableConversion}; the
 * semantics of control flow for a particular node implementing the interface are shared between
 * {@code LocalVariableTypesCalculator} that creates the conversions, and {@code CodeGenerator} that uses them.
 */
public interface JoinPredecessor {
    /**
     * Set the local variable conversions needed to unify their types at a control flow join point.
     * @param lc the current lexical context
     * @param conversion the conversions.
     * @return this node or a different node representing the change.
     */
    public JoinPredecessor setLocalVariableConversion(LexicalContext lc, LocalVariableConversion conversion);

    /**
     * Returns the local variable conversions needed to unify their types at a control flow join point.

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