| /* |
| * 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 java.util.Collections; |
| import java.util.List; |
| import jdk.nashorn.internal.codegen.Label; |
| import jdk.nashorn.internal.ir.annotations.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| /** |
| * IR representation of CASE clause. |
| * Case nodes are not BreakableNodes, but the SwitchNode is |
| */ |
| @Immutable |
| public final class CaseNode extends Node implements JoinPredecessor, Labels, Terminal { |
| private static final long serialVersionUID = 1L; |
| |
| /** Test expression. */ |
| private final Expression test; |
| |
| /** Statements. */ |
| private final Block body; |
| |
| /** Case entry label. */ |
| private final Label entry; |
| |
| /** |
| * @see JoinPredecessor |
| */ |
| private final LocalVariableConversion conversion; |
| |
| /** |
| * Constructors |
| * |
| * @param token token |
| * @param finish finish |
| * @param test case test node, can be any node in JavaScript |
| * @param body case body |
| */ |
| public CaseNode(final long token, final int finish, final Expression test, final Block body) { |
| super(token, finish); |
| |
| this.test = test; |
| this.body = body; |
| this.entry = new Label("entry"); |
| this.conversion = null; |
| } |
| |
| CaseNode(final CaseNode caseNode, final Expression test, final Block body, final LocalVariableConversion conversion) { |
| super(caseNode); |
| |
| this.test = test; |
| this.body = body; |
| this.entry = new Label(caseNode.entry); |
| this.conversion = conversion; |
| } |
| |
| /** |
| * Is this a terminal case node, i.e. does it end control flow like having a throw or return? |
| * |
| * @return true if this node statement is terminal |
| */ |
| @Override |
| public boolean isTerminal() { |
| return body.isTerminal(); |
| } |
| |
| /** |
| * Assist in IR navigation. |
| * @param visitor IR navigating visitor. |
| */ |
| @Override |
| public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterCaseNode(this)) { |
| final Expression newTest = test == null ? null : (Expression)test.accept(visitor); |
| final Block newBody = body == null ? null : (Block)body.accept(visitor); |
| |
| return visitor.leaveCaseNode(setTest(newTest).setBody(newBody)); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printTypes) { |
| if (test != null) { |
| sb.append("case "); |
| test.toString(sb, printTypes); |
| 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 Expression getTest() { |
| return test; |
| } |
| |
| /** |
| * Reset the test expression for this case node |
| * @param test new test expression |
| * @return new or same CaseNode |
| */ |
| public CaseNode setTest(final Expression test) { |
| if (this.test == test) { |
| return this; |
| } |
| return new CaseNode(this, test, body, conversion); |
| } |
| |
| @Override |
| public JoinPredecessor setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion conversion) { |
| if(this.conversion == conversion) { |
| return this; |
| } |
| return new CaseNode(this, test, body, conversion); |
| } |
| |
| @Override |
| public LocalVariableConversion getLocalVariableConversion() { |
| return conversion; |
| } |
| |
| private CaseNode setBody(final Block body) { |
| if (this.body == body) { |
| return this; |
| } |
| return new CaseNode(this, test, body, conversion); |
| } |
| |
| @Override |
| public List<Label> getLabels() { |
| return Collections.unmodifiableList(Collections.singletonList(entry)); |
| } |
| } |