1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.ir;
  27 
  28 import jdk.nashorn.internal.codegen.Label;
  29 import jdk.nashorn.internal.ir.annotations.Immutable;
  30 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
  31 
  32 /**
  33  * IR representation for {@code break} statements.
  34  */
  35 @Immutable
  36 public final class BreakNode extends JumpStatement {
  37     private static final long serialVersionUID = 1L;
  38 
  39     /**
  40      * Constructor
  41      *
  42      * @param lineNumber line number
  43      * @param token      token
  44      * @param finish     finish
  45      * @param labelName  label name for break or null if none
  46      */
  47     public BreakNode(final int lineNumber, final long token, final int finish, final String labelName) {
  48         super(lineNumber, token, finish, labelName);
  49     }
  50 
  51     private BreakNode(final BreakNode breakNode, final LocalVariableConversion conversion) {
  52         super(breakNode, conversion);
  53     }
  54 
  55     @Override
  56     public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
  57         if (visitor.enterBreakNode(this)) {
  58             return visitor.leaveBreakNode(this);
  59         }
  60 
  61         return this;
  62     }
  63 
  64     @Override
  65     JumpStatement createNewJumpStatement(final LocalVariableConversion conversion) {
  66         return new BreakNode(this, conversion);
  67     }
  68 
  69     @Override
  70     String getStatementName() {
  71         return "break";
  72     }
  73 
  74     @Override
  75     public BreakableNode getTarget(final LexicalContext lc) {
  76         return lc.getBreakable(getLabelName());
  77     }
  78 
  79     @Override
  80     Label getTargetLabel(final BreakableNode target) {
  81         return target.getBreakLabel();
  82     }
  83 }