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.literal;
020
021import lucee.runtime.type.scope.Scope;
022import lucee.transformer.bytecode.BytecodeContext;
023import lucee.transformer.bytecode.BytecodeException;
024import lucee.transformer.bytecode.Position;
025import lucee.transformer.bytecode.expression.ExpressionBase;
026import lucee.transformer.bytecode.expression.var.DataMember;
027import lucee.transformer.bytecode.expression.var.Variable;
028import lucee.transformer.bytecode.util.ASMConstants;
029import lucee.transformer.bytecode.util.Types;
030
031import org.objectweb.asm.Type;
032
033public class Null extends ExpressionBase  {
034
035
036        public Null(Position start, Position end) {
037                super(start, end);
038        }
039
040        @Override
041        public Type _writeOut(BytecodeContext bc, int mode) throws BytecodeException {
042                ASMConstants.NULL(bc.getAdapter());
043                return Types.OBJECT;
044        }
045
046        public Variable toVariable() {
047                Variable v = new Variable(Scope.SCOPE_UNDEFINED,getStart(),getEnd());
048                v.addMember(new DataMember(LitString.toExprString("null")));
049                return v;
050        }
051
052}