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}