| /* |
| * 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 a WHILE statement. This is the superclass of all |
| * loop nodes |
| */ |
| @Immutable |
| public final class WhileNode extends LoopNode { |
| private static final long serialVersionUID = 1L; |
| |
| |
| /** is this a do while node ? */ |
| private final boolean isDoWhile; |
| |
| /** |
| * Constructor |
| * |
| * @param lineNumber line number |
| * @param token token |
| * @param finish finish |
| * @param isDoWhile is this a do while loop? |
| */ |
| public WhileNode(final int lineNumber, final long token, final int finish, final boolean isDoWhile) { |
| super(lineNumber, token, finish, null, false); |
| this.isDoWhile = isDoWhile; |
| } |
| |
| /** |
| * Internal copy constructor |
| * |
| * @param whileNode while node |
| * @param test test |
| * @param body body |
| * @param controlFlowEscapes control flow escapes? |
| * @param conversion TODO |
| */ |
| private WhileNode(final WhileNode whileNode, final JoinPredecessorExpression test, final Block body, final boolean controlFlowEscapes, final LocalVariableConversion conversion) { |
| super(whileNode, test, body, controlFlowEscapes, conversion); |
| this.isDoWhile = whileNode.isDoWhile; |
| } |
| |
| @Override |
| public Node ensureUniqueLabels(final LexicalContext lc) { |
| return Node.replaceInLexicalContext(lc, this, new WhileNode(this, test, body, controlFlowEscapes, conversion)); |
| } |
| |
| @Override |
| public boolean hasGoto() { |
| return test == null; |
| } |
| |
| @Override |
| public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterWhileNode(this)) { |
| if (isDoWhile()) { |
| return visitor.leaveWhileNode( |
| setBody(lc, (Block)body.accept(visitor)). |
| setTest(lc, (JoinPredecessorExpression)test.accept(visitor))); |
| } |
| return visitor.leaveWhileNode( |
| setTest(lc, (JoinPredecessorExpression)test.accept(visitor)). |
| setBody(lc, (Block)body.accept(visitor))); |
| } |
| return this; |
| } |
| |
| @Override |
| public WhileNode setTest(final LexicalContext lc, final JoinPredecessorExpression test) { |
| if (this.test == test) { |
| return this; |
| } |
| return Node.replaceInLexicalContext(lc, this, new WhileNode(this, test, body, controlFlowEscapes, conversion)); |
| } |
| |
| @Override |
| public Block getBody() { |
| return body; |
| } |
| |
| @Override |
| public WhileNode setBody(final LexicalContext lc, final Block body) { |
| if (this.body == body) { |
| return this; |
| } |
| return Node.replaceInLexicalContext(lc, this, new WhileNode(this, test, body, controlFlowEscapes, conversion)); |
| } |
| |
| @Override |
| public WhileNode setControlFlowEscapes(final LexicalContext lc, final boolean controlFlowEscapes) { |
| if (this.controlFlowEscapes == controlFlowEscapes) { |
| return this; |
| } |
| return Node.replaceInLexicalContext(lc, this, new WhileNode(this, test, body, controlFlowEscapes, conversion)); |
| } |
| |
| @Override |
| JoinPredecessor setLocalVariableConversionChanged(final LexicalContext lc, final LocalVariableConversion conversion) { |
| return Node.replaceInLexicalContext(lc, this, new WhileNode(this, test, body, controlFlowEscapes, conversion)); |
| } |
| |
| /** |
| * Check if this is a do while loop or a normal while loop |
| * @return true if do while |
| */ |
| public boolean isDoWhile() { |
| return isDoWhile; |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printType) { |
| sb.append("while ("); |
| test.toString(sb, printType); |
| sb.append(')'); |
| } |
| |
| @Override |
| public boolean mustEnter() { |
| if (isDoWhile()) { |
| return true; |
| } |
| return test == null; |
| } |
| |
| @Override |
| public boolean hasPerIterationScope() { |
| return false; |
| } |
| } |