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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 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.
* @return the local variable conversions needed to unify their types at a control flow join point. Can be null.
* Can contain {@link LocalVariableConversion#isLive() dead conversions}.
*/
public LocalVariableConversion getLocalVariableConversion();
}
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