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 22 package com.sun.org.apache.bcel.internal.generic; 23 24 import com.sun.org.apache.bcel.internal.Const; 25 26 /** 27 * Returnaddress, the type JSR or JSR_W instructions push upon the stack. 28 * 29 * see vmspec2 3.3.3 30 */ 31 public class ReturnaddressType extends Type { 32 33 public static final ReturnaddressType NO_TARGET = new ReturnaddressType(); 34 private InstructionHandle returnTarget; 35 36 37 /** 38 * A Returnaddress [that doesn't know where to return to]. 39 */ ReturnaddressType()40 private ReturnaddressType() { 41 super(Const.T_ADDRESS, "<return address>"); 42 } 43 44 45 /** 46 * Creates a ReturnaddressType object with a target. 47 */ ReturnaddressType(final InstructionHandle returnTarget)48 public ReturnaddressType(final InstructionHandle returnTarget) { 49 super(Const.T_ADDRESS, "<return address targeting " + returnTarget + ">"); 50 this.returnTarget = returnTarget; 51 } 52 53 54 /** @return a hash code value for the object. 55 */ 56 @Override hashCode()57 public int hashCode() { 58 if (returnTarget == null) { 59 return 0; 60 } 61 return returnTarget.hashCode(); 62 } 63 64 65 /** 66 * Returns if the two Returnaddresses refer to the same target. 67 */ 68 @Override equals( final Object rat )69 public boolean equals( final Object rat ) { 70 if (!(rat instanceof ReturnaddressType)) { 71 return false; 72 } 73 final ReturnaddressType that = (ReturnaddressType) rat; 74 if (this.returnTarget == null || that.returnTarget == null) { 75 return that.returnTarget == this.returnTarget; 76 } 77 return that.returnTarget.equals(this.returnTarget); 78 } 79 80 81 /** 82 * @return the target of this ReturnaddressType 83 */ getTarget()84 public InstructionHandle getTarget() { 85 return returnTarget; 86 } 87 } 88