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; 028import lucee.transformer.bytecode.literal.LitBoolean; 029 030import org.objectweb.asm.Label; 031import org.objectweb.asm.Opcodes; 032import org.objectweb.asm.commons.GeneratorAdapter; 033 034public final class While extends StatementBaseNoFinal implements FlowControlBreak,FlowControlContinue,HasBody { 035 036 private ExprBoolean expr; 037 private Body body; 038 039 040 private Label begin = new Label(); 041 private Label end = new Label(); 042 private String label; 043 044 045 046 /** 047 * Constructor of the class 048 * @param expr 049 * @param body 050 * @param line 051 */ 052 public While(Expression expr,Body body,Position start,Position end, String label) { 053 super(start,end); 054 this.expr=CastBoolean.toExprBoolean(expr); 055 this.body=body; 056 body.setParent(this); 057 this.label=label; 058 } 059 060 061 /** 062 * Constructor of the class 063 * @param b 064 * @param body 065 * @param line 066 */ 067 public While(boolean b, Body body,Position start,Position end, String label) { 068 this(LitBoolean.toExprBoolean(b),body,start, end, label); 069 } 070 071 @Override 072 public void _writeOut(BytecodeContext bc) throws BytecodeException { 073 GeneratorAdapter adapter = bc.getAdapter(); 074 adapter.visitLabel(begin); 075 076 expr.writeOut(bc, Expression.MODE_VALUE); 077 adapter.ifZCmp(Opcodes.IFEQ, end); 078 079 body.writeOut(bc); 080 adapter.visitJumpInsn(Opcodes.GOTO, begin); 081 082 adapter.visitLabel(end); 083 } 084 085 @Override 086 public Label getBreakLabel() { 087 return end; 088 } 089 090 @Override 091 public Label getContinueLabel() { 092 return begin; 093 } 094 095 @Override 096 public Body getBody() { 097 return body; 098 } 099 100 @Override 101 public String getLabel() { 102 return label; 103 } 104}