001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020import org.apache.bcel.Const; 021import org.apache.bcel.ExceptionConst; 022 023/** 024 * Super class for the xRETURN family of instructions. 025 * 026 */ 027public abstract class ReturnInstruction extends Instruction implements ExceptionThrower, 028 TypedInstruction, StackConsumer { 029 030 /** 031 * Empty constructor needed for Instruction.readInstruction. 032 * Not to be used otherwise. 033 */ 034 ReturnInstruction() { 035 } 036 037 038 /** 039 * @param opcode of instruction 040 */ 041 protected ReturnInstruction(final short opcode) { 042 super(opcode, (short) 1); 043 } 044 045 046 public Type getType() { 047 final short _opcode = super.getOpcode(); 048 switch (_opcode) { 049 case Const.IRETURN: 050 return Type.INT; 051 case Const.LRETURN: 052 return Type.LONG; 053 case Const.FRETURN: 054 return Type.FLOAT; 055 case Const.DRETURN: 056 return Type.DOUBLE; 057 case Const.ARETURN: 058 return Type.OBJECT; 059 case Const.RETURN: 060 return Type.VOID; 061 default: // Never reached 062 throw new ClassGenException("Unknown type " + _opcode); 063 } 064 } 065 066 067 @Override 068 public Class<?>[] getExceptions() { 069 return new Class[] { 070 ExceptionConst.ILLEGAL_MONITOR_STATE 071 }; 072 } 073 074 075 /** @return type associated with the instruction 076 */ 077 @Override 078 public Type getType( final ConstantPoolGen cp ) { 079 return getType(); 080 } 081}