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 java.util.Stack; 022 023import lucee.transformer.bytecode.BytecodeContext; 024import lucee.transformer.bytecode.BytecodeException; 025import lucee.transformer.bytecode.Position; 026import lucee.transformer.bytecode.Statement; 027import lucee.transformer.bytecode.expression.Expression; 028import lucee.transformer.bytecode.util.ASMConstants; 029import lucee.transformer.bytecode.util.Types; 030import lucee.transformer.bytecode.visitor.OnFinally; 031 032import org.objectweb.asm.Opcodes; 033import org.objectweb.asm.commons.GeneratorAdapter; 034 035/** 036 * Return Statement 037 */ 038public final class Return extends StatementBaseNoFinal { 039 040 Expression expr; 041 042 /** 043 * Constructor of the class 044 * @param line 045 */ 046 public Return(Position start,Position end) { 047 super(start,end); 048 setHasFlowController(true); 049 //expr=LitString.toExprString("", line); 050 } 051 052 /** 053 * Constructor of the class 054 * @param expr 055 * @param line 056 */ 057 public Return(Expression expr, Position start,Position end) { 058 super(start,end); 059 this.expr=expr; 060 setHasFlowController(true); 061 //if(expr==null)expr=LitString.toExprString("", line); 062 } 063 064 public void _writeOut(BytecodeContext bc) throws BytecodeException { 065 GeneratorAdapter adapter = bc.getAdapter(); 066 067 068 if(expr==null)ASMConstants.NULL(adapter); 069 else expr.writeOut(bc, Expression.MODE_REF); 070 071 // call finallies 072 Stack<OnFinally> finallies = bc.getOnFinallyStack(); 073 int len=finallies.size(); 074 OnFinally onFinally; 075 if(len>0) { 076 int rtn = adapter.newLocal(Types.OBJECT); 077 adapter.storeLocal(rtn, Types.OBJECT); 078 for(int i=len-1;i>=0;i--) { 079 onFinally=finallies.get(i); 080 if(!bc.insideFinally(onFinally)) 081 onFinally.writeOut(bc); 082 } 083 adapter.loadLocal(rtn, Types.OBJECT); 084 } 085 086 087 088 if(bc.getMethod().getReturnType().equals(Types.VOID)) { 089 adapter.pop(); 090 adapter.visitInsn(Opcodes.RETURN); 091 } 092 else adapter.visitInsn(Opcodes.ARETURN); 093 } 094 095 096 /** 097 * 098 * @see lucee.transformer.bytecode.statement.StatementBase#setParent(lucee.transformer.bytecode.Statement) 099 */ 100 public void setParent(Statement parent) { 101 super.setParent(parent); 102 parent.setHasFlowController(true); 103 } 104}