Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/ThrowNode.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 | e478708faa22 |
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.annotations.Ignore; import jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.runtime.Source; /** * IR representation for THROW statements. */ public class ThrowNode extends Node { /** Exception expression. */ private Node expression; /** Try chain. */ @Ignore private final TryNode tryChain; /** * Constructor * * @param source the source * @param token token * @param finish finish * @param expression expression to throw * @param tryChain surrounding try chain */ public ThrowNode(final Source source, final long token, final int finish, final Node expression, final TryNode tryChain) { super(source, token, finish); this.expression = expression; this.tryChain = tryChain; setIsTerminal(true); } private ThrowNode(final ThrowNode throwNode, final CopyState cs) { super(throwNode); this.expression = cs.existingOrCopy(throwNode.expression); this.tryChain = (TryNode)cs.existingOrSame(throwNode.tryChain); } @Override protected Node copy(final CopyState cs) { return new ThrowNode(this, cs); } /** * Assist in IR navigation. * @param visitor IR navigating visitor. */ @Override public Node accept(final NodeVisitor visitor) { if (visitor.enterThrowNode(this) != null) { setExpression(expression.accept(visitor)); return visitor.leaveThrowNode(this); } return this; } @Override public void toString(final StringBuilder sb) { sb.append("throw "); if (expression != null) { expression.toString(sb); } } /** * Get the expression that is being thrown by this node * @return expression */ public Node getExpression() { return expression; } /** * Reset the expression being thrown by this node * @param expression new expression */ public void setExpression(final Node expression) { this.expression = expression; } /** * Get surrounding tryChain for this node * @return try chain */ public TryNode getTryChain() { return tryChain; } }