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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.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;
}
}
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