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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 labeled statement. It implements JoinPredecessor to hold conversions that need to be effected
* when the block exits normally, but is also targeted by a break statement that might bring different local variable
* types to the join at the break point.
*/
@Immutable
public final class LabelNode extends LexicalContextStatement implements JoinPredecessor {
private static final long serialVersionUID = 1L;
/** Label ident. */
private final String labelName;
/** Statements. */
private final Block body;
private final LocalVariableConversion localVariableConversion;
/**
* Constructor
*
* @param lineNumber line number
* @param token token
* @param finish finish
* @param labelName label name
* @param body body of label node
*/
public LabelNode(final int lineNumber, final long token, final int finish, final String labelName, final Block body) {
super(lineNumber, token, finish);
this.labelName = labelName;
this.body = body;
this.localVariableConversion = null;
}
private LabelNode(final LabelNode labelNode, final String labelName, final Block body, final LocalVariableConversion localVariableConversion) {
super(labelNode);
this.labelName = labelName;
this.body = body;
this.localVariableConversion = localVariableConversion;
}
@Override
public boolean isTerminal() {
return body.isTerminal();
}
@Override
public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) {
if (visitor.enterLabelNode(this)) {
return visitor.leaveLabelNode(setBody(lc, (Block)body.accept(visitor)));
}
return this;
}
@Override
public void toString(final StringBuilder sb, final boolean printType) {
sb.append(labelName).append(':');
}
/**
* Get the body of the node
* @return the body
*/
public Block getBody() {
return body;
}
/**
* Reset the body of the node
* @param lc lexical context
* @param body new body
* @return new for node if changed or existing if not
*/
public LabelNode setBody(final LexicalContext lc, final Block body) {
if (this.body == body) {
return this;
}
return Node.replaceInLexicalContext(lc, this, new LabelNode(this, labelName, body, localVariableConversion));
}
/**
* Get the label name
* @return the label
*/
public String getLabelName() {
return labelName;
}
@Override
public LocalVariableConversion getLocalVariableConversion() {
return localVariableConversion;
}
@Override
public LabelNode setLocalVariableConversion(final LexicalContext lc, final LocalVariableConversion localVariableConversion) {
if(this.localVariableConversion == localVariableConversion) {
return this;
}
return Node.replaceInLexicalContext(lc, this, new LabelNode(this, labelName, body, localVariableConversion));
}
}
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