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, TypedInstruction, StackConsumer { 028 029 /** 030 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 031 */ 032 ReturnInstruction() { 033 } 034 035 /** 036 * @param opcode of instruction 037 */ 038 protected ReturnInstruction(final short opcode) { 039 super(opcode, (short) 1); 040 } 041 042 @Override 043 public Class<?>[] getExceptions() { 044 return new Class[] {ExceptionConst.ILLEGAL_MONITOR_STATE}; 045 } 046 047 public Type getType() { 048 final short opcode = super.getOpcode(); 049 switch (opcode) { 050 case Const.IRETURN: 051 return Type.INT; 052 case Const.LRETURN: 053 return Type.LONG; 054 case Const.FRETURN: 055 return Type.FLOAT; 056 case Const.DRETURN: 057 return Type.DOUBLE; 058 case Const.ARETURN: 059 return Type.OBJECT; 060 case Const.RETURN: 061 return Type.VOID; 062 default: // Never reached 063 throw new ClassGenException("Unknown type " + opcode); 064 } 065 } 066 067 /** 068 * @return type associated with the instruction 069 */ 070 @Override 071 public Type getType(final ConstantPoolGen cp) { 072 return getType(); 073 } 074}