ReturnaddressType.java revision 1113:2fdbfbde3bc0
1/* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5/* 6 * Licensed to the Apache Software Foundation (ASF) under one or more 7 * contributor license agreements. See the NOTICE file distributed with 8 * this work for additional information regarding copyright ownership. 9 * The ASF licenses this file to You under the Apache License, Version 2.0 10 * (the "License"); you may not use this file except in compliance with 11 * the License. You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22package com.sun.org.apache.bcel.internal.generic; 23 24import com.sun.org.apache.bcel.internal.Constants; 25import java.util.Objects; 26 27/** 28 * Returnaddress, the type JSR or JSR_W instructions push upon the stack. 29 * 30 * see vmspec2 3.3.3 31 * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase">Enver Haase</A> 32 */ 33public class ReturnaddressType extends Type { 34 35 public static final ReturnaddressType NO_TARGET = new ReturnaddressType(); 36 private InstructionHandle returnTarget; 37 38 /** 39 * A Returnaddress [that doesn't know where to return to]. 40 */ 41 private ReturnaddressType(){ 42 super(Constants.T_ADDRESS, "<return address>"); 43 } 44 45 /** 46 * Creates a ReturnaddressType object with a target. 47 */ 48 public ReturnaddressType(InstructionHandle returnTarget) { 49 super(Constants.T_ADDRESS, "<return address targeting "+returnTarget+">"); 50 this.returnTarget = returnTarget; 51 } 52 53 @Override 54 public int hashCode() { 55 return Objects.hashCode(this.returnTarget); 56 } 57 58 /** 59 * Returns if the two Returnaddresses refer to the same target. 60 */ 61 @Override 62 public boolean equals(Object rat){ 63 if(!(rat instanceof ReturnaddressType)) 64 return false; 65 66 return ((ReturnaddressType)rat).returnTarget.equals(this.returnTarget); 67 } 68 69 /** 70 * @return the target of this ReturnaddressType 71 */ 72 public InstructionHandle getTarget(){ 73 return returnTarget; 74 } 75} 76