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 java.io.*; 25 26/** 27 * JSR - Jump to subroutine 28 * 29 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 30 */ 31public class JSR extends JsrInstruction implements VariableLengthInstruction { 32 /** 33 * Empty constructor needed for the Class.newInstance() statement in 34 * Instruction.readInstruction(). Not to be used otherwise. 35 */ 36 JSR() {} 37 38 public JSR(InstructionHandle target) { 39 super(com.sun.org.apache.bcel.internal.Constants.JSR, target); 40 } 41 42 /** 43 * Dump instruction as byte code to stream out. 44 * @param out Output stream 45 */ 46 public void dump(DataOutputStream out) throws IOException { 47 index = getTargetOffset(); 48 if(opcode == com.sun.org.apache.bcel.internal.Constants.JSR) 49 super.dump(out); 50 else { // JSR_W 51 index = getTargetOffset(); 52 out.writeByte(opcode); 53 out.writeInt(index); 54 } 55 } 56 57 protected int updatePosition(int offset, int max_offset) { 58 int i = getTargetOffset(); // Depending on old position value 59 60 position += offset; // Position may be shifted by preceding expansions 61 62 if(Math.abs(i) >= (32767 - max_offset)) { // to large for short (estimate) 63 opcode = com.sun.org.apache.bcel.internal.Constants.JSR_W; 64 length = 5; 65 return 2; // 5 - 3 66 } 67 68 return 0; 69 } 70 71 /** 72 * Call corresponding visitor method(s). The order is: 73 * Call visitor methods of implemented interfaces first, then 74 * call methods according to the class hierarchy in descending order, 75 * i.e., the most specific visitXXX() call comes last. 76 * 77 * @param v Visitor object 78 */ 79 public void accept(Visitor v) { 80 v.visitStackProducer(this); 81 v.visitVariableLengthInstruction(this); 82 v.visitBranchInstruction(this); 83 v.visitJsrInstruction(this); 84 v.visitJSR(this); 85 } 86} 87