1 /* 2 * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Licensed to the Apache Software Foundation (ASF) under one or more 6 * contributor license agreements. See the NOTICE file distributed with 7 * this work for additional information regarding copyright ownership. 8 * The ASF licenses this file to You under the Apache License, Version 2.0 9 * (the "License"); you may not use this file except in compliance with 10 * the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.bcel.internal.generic; 22 23 import com.sun.org.apache.bcel.internal.Const; 24 import com.sun.org.apache.bcel.internal.ExceptionConst; 25 26 /** 27 * Super class for the xRETURN family of instructions. 28 * 29 * @LastModified: Jan 2020 30 */ 31 public abstract class ReturnInstruction extends Instruction implements ExceptionThrower, 32 TypedInstruction, StackConsumer { 33 34 /** 35 * Empty constructor needed for Instruction.readInstruction. 36 * Not to be used otherwise. 37 */ 38 ReturnInstruction() { 39 } 40 41 42 /** 43 * @param opcode of instruction 44 */ 45 protected ReturnInstruction(final short opcode) { 46 super(opcode, (short) 1); 47 } 48 49 50 public Type getType() { 51 final short _opcode = super.getOpcode(); 52 switch (_opcode) { 53 case Const.IRETURN: 54 return Type.INT; 55 case Const.LRETURN: 56 return Type.LONG; 57 case Const.FRETURN: 58 return Type.FLOAT; 59 case Const.DRETURN: 60 return Type.DOUBLE; 61 case Const.ARETURN: 62 return Type.OBJECT; 63 case Const.RETURN: 64 return Type.VOID; 65 default: // Never reached 66 throw new ClassGenException("Unknown type " + _opcode); 67 } 68 } 69 70 71 @Override 72 public Class<?>[] getExceptions() { 73 return new Class<?>[] { 74 ExceptionConst.ILLEGAL_MONITOR_STATE 75 }; 76 } 77 78 79 /** @return type associated with the instruction 80 */ 81 @Override 82 public Type getType( final ConstantPoolGen cp ) { 83 return getType(); 84 } 85 }