Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/CaseNode.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.codegen.Label; import jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.runtime.Source; /** * IR representation of CASE clause. * */ public class CaseNode extends BreakableNode { /** Test expression. */ private Node test; /** Statements. */ private Block body; /** Case entry label. */ private final Label entry; /** * Constructors * * @param source the source * @param token token * @param finish finish * @param test case test node, can be any node in JavaScript * @param body case body */ public CaseNode(final Source source, final long token, final int finish, final Node test, final Block body) { super(source, token, finish); this.test = test; this.body = body; this.entry = new Label("entry"); } private CaseNode(final CaseNode caseNode, final CopyState cs) { super(caseNode); this.test = cs.existingOrCopy(caseNode.test); this.body = (Block)cs.existingOrCopy(caseNode.body); this.entry = new Label(caseNode.entry); } @Override protected Node copy(final CopyState cs) { return new CaseNode(this, cs); } /** * Assist in IR navigation. * @param visitor IR navigating visitor. */ @Override public Node accept(final NodeVisitor visitor) { if (visitor.enterCaseNode(this) != null) { if (test != null) { test = test.accept(visitor); } if (body != null) { body = (Block)body.accept(visitor); } return visitor.leaveCaseNode(this); } return this; } @Override public void toString(final StringBuilder sb) { if (test != null) { sb.append("case "); test.toString(sb); sb.append(':'); } else { sb.append("default:"); } } /** * Get the body for this case node * @return the body */ public Block getBody() { return body; } /** * Get the entry label for this case node * @return the entry label */ public Label getEntry() { return entry; } /** * Get the test expression for this case node * @return the test */ public Node getTest() { return test; } /** * Reset the test expression for this case node * @param test new test expression */ public void setTest(final Node test) { this.test = test; } }