| /* |
| * 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.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| /** |
| * IR representation for an IF statement. |
| */ |
| @Immutable |
| public final class IfNode extends Statement implements JoinPredecessor { |
| private static final long serialVersionUID = 1L; |
| |
| /** Test expression. */ |
| private final Expression test; |
| |
| /** Pass statements. */ |
| private final Block pass; |
| |
| /** Fail statements. */ |
| private final Block fail; |
| |
| /** |
| * Local variable conversions that need to be performed after test if it evaluates to false, and there's no else |
| * branch. |
| */ |
| private final LocalVariableConversion conversion; |
| |
| /** |
| * Constructor |
| * |
| * @param lineNumber line number |
| * @param token token |
| * @param finish finish |
| * @param test test |
| * @param pass block to execute when test passes |
| * @param fail block to execute when test fails or null |
| */ |
| public IfNode(final int lineNumber, final long token, final int finish, final Expression test, final Block pass, final Block fail) { |
| super(lineNumber, token, finish); |
| this.test = test; |
| this.pass = pass; |
| this.fail = fail; |
| this.conversion = null; |
| } |
| |
| private IfNode(final IfNode ifNode, final Expression test, final Block pass, final Block fail, final LocalVariableConversion conversion) { |
| super(ifNode); |
| this.test = test; |
| this.pass = pass; |
| this.fail = fail; |
| this.conversion = conversion; |
| } |
| |
| @Override |
| public boolean isTerminal() { |
| return pass.isTerminal() && fail != null && fail.isTerminal(); |
| } |
| |
| @Override |
| public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterIfNode(this)) { |
| return visitor.leaveIfNode( |
| setTest((Expression)test.accept(visitor)). |
| setPass((Block)pass.accept(visitor)). |
| setFail(fail == null ? null : (Block)fail.accept(visitor))); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printTypes) { |
| sb.append("if ("); |
| test.toString(sb, printTypes); |
| sb.append(')'); |
| } |
| |
| /** |
| * Get the else block of this IfNode |
| * @return the else block, or null if none exists |
| */ |
| public Block getFail() { |
| return fail; |
| } |
| |
| private IfNode setFail(final Block fail) { |
| if (this.fail == fail) { |
| return this; |
| } |
| return new IfNode(this, test, pass, fail, conversion); |
| } |
| |
| /** |
| * Get the then block for this IfNode |
| * @return the then block |
| */ |
| public Block getPass() { |
| return pass; |
| } |
| |
| private IfNode setPass(final Block pass) { |
| if (this.pass == pass) { |
| return this; |
| } |
| return new IfNode(this, test, pass, fail, conversion); |
| } |
| |
| /** |
| * Get the test expression for this IfNode |
| * @return the test expression |
| */ |
| public Expression getTest() { |
| return test; |
| } |
| |
| /** |
| * Reset the test expression for this IfNode |
| * @param test a new test expression |
| * @return new or same IfNode |
| */ |
| public IfNode setTest(final Expression test) { |
| if (this.test == test) { |
| return this; |
| } |
| return new IfNode(this, test, pass, fail, conversion); |
| } |
| |
| @Override |
| public IfNode setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion conversion) { |
| if(this.conversion == conversion) { |
| return this; |
| } |
| return new IfNode(this, test, pass, fail, conversion); |
| } |
| |
| @Override |
| public LocalVariableConversion getLocalVariableConversion() { |
| return conversion; |
| } |
| } |