001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.transformer.bytecode.statement;
020
021import lucee.transformer.bytecode.Body;
022import lucee.transformer.bytecode.BytecodeContext;
023import lucee.transformer.bytecode.BytecodeException;
024import lucee.transformer.bytecode.Position;
025import lucee.transformer.bytecode.cast.CastBoolean;
026import lucee.transformer.bytecode.expression.ExprBoolean;
027import lucee.transformer.bytecode.expression.Expression;
028
029import org.objectweb.asm.Label;
030import org.objectweb.asm.Opcodes;
031import org.objectweb.asm.commons.GeneratorAdapter;
032
033public final class DoWhile extends StatementBaseNoFinal implements FlowControlBreak,FlowControlContinue,HasBody {
034
035        private ExprBoolean expr;
036        private Body body;
037
038        private Label begin = new Label();
039        private Label beforeEnd = new Label();
040        private Label end = new Label();
041        private String label;
042        
043        
044        /**
045         * Constructor of the class
046         * @param expr
047         * @param body
048         * @param line
049         */
050        public DoWhile(Expression expr,Body body,Position start, Position end, String label) {
051                super(start,end);
052                this.expr=CastBoolean.toExprBoolean(expr);
053                this.body=body;
054                body.setParent(this);
055                this.label=label;
056        }
057        
058        @Override
059        public void _writeOut(BytecodeContext bc) throws BytecodeException {
060                GeneratorAdapter adapter = bc.getAdapter();
061                adapter.visitLabel(begin);
062                body.writeOut(bc);
063                
064                adapter.visitLabel(beforeEnd);
065                
066                
067                expr.writeOut(bc, Expression.MODE_VALUE);
068                adapter.ifZCmp(Opcodes.IFNE, begin);
069                
070                adapter.visitLabel(end);
071                
072        }
073
074        @Override
075        public Label getBreakLabel() {
076                return end;
077        }
078
079        @Override
080        public Label getContinueLabel() {
081                return beforeEnd;
082        }
083
084        @Override
085        public Body getBody() {
086                return body;
087        }
088
089        @Override
090        public String getLabel() {
091                return label;
092        }
093
094}