Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/ExecuteNode.java @ 143:4be452026847
8010652: Eliminate non-child references in Block/FunctionNode, and make few node types immutable
Reviewed-by: jlaskey, lagergren
author | attila |
---|---|
date | Sat, 23 Mar 2013 00:58:39 +0100 |
parents | 59970b70ebb5 |
children |
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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; import jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.runtime.Source; /** * IR representation for executing bare expressions. Basically, an expression * node means "this code will be executed" and evaluating it results in * statements being added to the IR */ public class ExecuteNode extends Node { /** Expression to execute. */ private Node expression; /** * Constructor * * @param source the source * @param token token * @param finish finish * @param expression the expression to execute */ public ExecuteNode(final Source source, final long token, final int finish, final Node expression) { super(source, token, finish); this.expression = expression; } /** * Constructor * * @param expression an expression to wrap, from which source, tokens and finish are also inherited */ public ExecuteNode(final Node expression) { super(expression.getSource(), expression.getToken(), expression.getFinish()); this.expression = expression; } private ExecuteNode(final ExecuteNode executeNode, final CopyState cs) { super(executeNode); this.expression = cs.existingOrCopy(executeNode.expression); } @Override protected Node copy(final CopyState cs) { return new ExecuteNode(this, cs); } @Override public boolean equals(final Object other) { if (!super.equals(other)) { return false; } return expression.equals(((ExecuteNode)other).getExpression()); } @Override public int hashCode() { return super.hashCode() ^ expression.hashCode(); } @Override public Node accept(final NodeVisitor visitor) { if (visitor.enterExecuteNode(this) != null) { setExpression(expression.accept(visitor)); return visitor.leaveExecuteNode(this); } return this; } @Override public void toString(final StringBuilder sb) { expression.toString(sb); } /** * Return the expression to be executed * @return the expression */ public Node getExpression() { return expression; } /** * Reset the expression to be executed * @param expression the expression */ public void setExpression(final Node expression) { this.expression = expression; } }