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.op; 020 021import lucee.runtime.exp.TemplateException; 022import lucee.transformer.bytecode.BytecodeContext; 023import lucee.transformer.bytecode.BytecodeException; 024import lucee.transformer.bytecode.Literal; 025import lucee.transformer.bytecode.Position; 026import lucee.transformer.bytecode.cast.CastBoolean; 027import lucee.transformer.bytecode.expression.ExprBoolean; 028import lucee.transformer.bytecode.expression.Expression; 029import lucee.transformer.bytecode.expression.ExpressionBase; 030import lucee.transformer.bytecode.literal.LitBoolean; 031import lucee.transformer.bytecode.util.Methods; 032import lucee.transformer.bytecode.util.Types; 033 034import org.objectweb.asm.Label; 035import org.objectweb.asm.Opcodes; 036import org.objectweb.asm.Type; 037import org.objectweb.asm.commons.GeneratorAdapter; 038 039public final class OpNegate extends ExpressionBase implements ExprBoolean { 040 041 private ExprBoolean expr; 042 043 private OpNegate(Expression expr, Position start, Position end) { 044 super(start,end); 045 this.expr=CastBoolean.toExprBoolean(expr); 046 } 047 048 /** 049 * Create a String expression from a Expression 050 * @param left 051 * @param right 052 * 053 * @return String expression 054 * @throws TemplateException 055 */ 056 public static ExprBoolean toExprBoolean(Expression expr, Position start, Position end) { 057 if(expr instanceof Literal) { 058 Boolean b=((Literal) expr).getBoolean(null); 059 if(b!=null) { 060 return new LitBoolean(!b.booleanValue(),start,end); 061 } 062 } 063 return new OpNegate(expr,start,end); 064 } 065 066 067 /** 068 * 069 * @see lucee.transformer.bytecode.expression.ExpressionBase#_writeOut(org.objectweb.asm.commons.GeneratorAdapter, int) 070 */ 071 public Type _writeOut(BytecodeContext bc, int mode) throws BytecodeException { 072 GeneratorAdapter adapter = bc.getAdapter(); 073 if(mode==MODE_REF) { 074 _writeOut(bc,MODE_VALUE); 075 adapter.invokeStatic(Types.CASTER,Methods.METHOD_TO_BOOLEAN_FROM_BOOLEAN); 076 return Types.BOOLEAN; 077 } 078 079 080 Label l1 = new Label(); 081 Label l2 = new Label(); 082 083 expr.writeOut(bc, MODE_VALUE); 084 adapter.ifZCmp(Opcodes.IFEQ,l1); 085 086 adapter.visitInsn(Opcodes.ICONST_0); 087 adapter.visitJumpInsn(Opcodes.GOTO, l2); 088 adapter.visitLabel(l1); 089 adapter.visitInsn(Opcodes.ICONST_1); 090 adapter.visitLabel(l2); 091 092 return Types.BOOLEAN_VALUE; 093 094 } 095 096 /*public int getType() { 097 return Types._BOOLEAN; 098 }*/ 099 100}