001    /*
002     $Id: BlockScope.java,v 1.4 2004/07/10 03:31:39 bran Exp $
003    
004     Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005    
006     Redistribution and use of this software and associated documentation
007     ("Software"), with or without modification, are permitted provided
008     that the following conditions are met:
009    
010     1. Redistributions of source code must retain copyright
011        statements and notices.  Redistributions must also contain a
012        copy of this document.
013    
014     2. Redistributions in binary form must reproduce the
015        above copyright notice, this list of conditions and the
016        following disclaimer in the documentation and/or other
017        materials provided with the distribution.
018    
019     3. The name "groovy" must not be used to endorse or promote
020        products derived from this Software without prior written
021        permission of The Codehaus.  For written permission,
022        please contact info@codehaus.org.
023    
024     4. Products derived from this Software may not be called "groovy"
025        nor may "groovy" appear in their names without prior written
026        permission of The Codehaus. "groovy" is a registered
027        trademark of The Codehaus.
028    
029     5. Due credit should be given to The Codehaus -
030        http://groovy.codehaus.org/
031    
032     THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033     ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034     NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036     THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037     INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041     STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043     OF THE POSSIBILITY OF SUCH DAMAGE.
044    
045     */
046    package org.codehaus.groovy.classgen;
047    
048    import org.objectweb.asm.Label;
049    
050    /**
051     * A helper class to help maintain a stack of scopes for labels etc
052     * 
053     * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
054     * @version $Revision: 1.4 $
055     */
056    public class BlockScope {
057    
058    
059        // new scopes for methods do not have continue and break labels
060        // for, while, dowhile need to explicitly set the lables
061            // switch can break but not continue
062        private Label breakLabel = null; //new Label();
063        private Label continueLabel = null; //new Label();
064        private BlockScope parent;
065        private int firstVariableIndex = 0;
066        
067        public BlockScope(BlockScope parent) {
068            this.parent = parent;
069        }
070        
071        public Label getContinueLabel() {
072            return continueLabel;
073        }
074    
075        public void setContinueLabel(Label continueLabel) {
076            this.continueLabel = continueLabel;
077        }
078    
079        public Label getBreakLabel() {
080            return breakLabel;
081        }
082    
083        public void setBreakLabel(Label breakLabel) {
084                this.breakLabel = breakLabel;
085            }
086    
087        public BlockScope getParent() {
088            return parent;
089        }
090    
091        public int getFirstVariableIndex() {
092            return firstVariableIndex;
093        }
094    
095        public void setFirstVariableIndex(int firstVariableIndex) {
096            this.firstVariableIndex = firstVariableIndex;
097        }
098    
099        /**
100         *
101         * @param firstVariableIndex
102         * @deprecated
103         */
104        public void setLastVariableIndex(int firstVariableIndex) {
105            this.firstVariableIndex = firstVariableIndex;
106        }
107    
108        public int getLastVariableIndex() {
109            return firstVariableIndex;
110        }
111    
112    }