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 */ 017package org.apache.bcel.generic; 018 019import org.apache.bcel.Const; 020import org.apache.bcel.ExceptionConst; 021 022/** 023 * Super class for the xRETURN family of instructions. 024 */ 025public abstract class ReturnInstruction extends Instruction implements ExceptionThrower, TypedInstruction, StackConsumer { 026 027 /** 028 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 029 */ 030 ReturnInstruction() { 031 } 032 033 /** 034 * @param opcode of instruction 035 */ 036 protected ReturnInstruction(final short opcode) { 037 super(opcode, (short) 1); 038 } 039 040 @Override 041 public Class<?>[] getExceptions() { 042 return new Class[] {ExceptionConst.ILLEGAL_MONITOR_STATE}; 043 } 044 045 public Type getType() { 046 final short opcode = super.getOpcode(); 047 switch (opcode) { 048 case Const.IRETURN: 049 return Type.INT; 050 case Const.LRETURN: 051 return Type.LONG; 052 case Const.FRETURN: 053 return Type.FLOAT; 054 case Const.DRETURN: 055 return Type.DOUBLE; 056 case Const.ARETURN: 057 return Type.OBJECT; 058 case Const.RETURN: 059 return Type.VOID; 060 default: // Never reached 061 throw new ClassGenException("Unknown type " + opcode); 062 } 063 } 064 065 /** 066 * @return type associated with the instruction 067 */ 068 @Override 069 public Type getType(final ConstantPoolGen cp) { 070 return getType(); 071 } 072}