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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 java.util.Collections;
import java.util.List;
import jdk.nashorn.internal.codegen.Label;
import jdk.nashorn.internal.ir.annotations.Immutable;
@Immutable
abstract class BreakableStatement extends LexicalContextStatement implements BreakableNode {
/** break label. */
protected final Label breakLabel;
/**
* Constructor
*
* @param lineNumber line number
* @param token token
* @param finish finish
* @param breakLabel break label
*/
protected BreakableStatement(final int lineNumber, final long token, final int finish, final Label breakLabel) {
super(lineNumber, token, finish);
this.breakLabel = breakLabel;
}
/**
* Copy constructor
*
* @param breakableNode source node
*/
protected BreakableStatement(final BreakableStatement breakableNode) {
super(breakableNode);
this.breakLabel = new Label(breakableNode.getBreakLabel());
}
/**
* Check whether this can be broken out from without using a label,
* e.g. everything but Blocks, basically
* @return true if breakable without label
*/
@Override
public boolean isBreakableWithoutLabel() {
return true;
}
/**
* Return the break label, i.e. the location to go to on break.
* @return the break label
*/
@Override
public Label getBreakLabel() {
return breakLabel;
}
/**
* Return the labels associated with this node. Breakable nodes that
* aren't LoopNodes only have a break label - the location immediately
* afterwards the node in code
* @return list of labels representing locations around this node
*/
@Override
public List<Label> getLabels() {
return Collections.singletonList(breakLabel);
}
}
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