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 java.io.DataOutputStream; 25 import java.io.IOException; 26 27 /** 28 * JSR - Jump to subroutine 29 * 30 * @version $Id$ 31 */ 32 public class JSR extends JsrInstruction implements VariableLengthInstruction { 33 34 /** 35 * Empty constructor needed for Instruction.readInstruction. 36 * Not to be used otherwise. 37 */ 38 JSR() { 39 } 40 41 42 public JSR(final InstructionHandle target) { 43 super(com.sun.org.apache.bcel.internal.Const.JSR, target); 44 } 45 46 47 /** 48 * Dump instruction as byte code to stream out. 49 * @param out Output stream 50 */ 51 @Override 52 public void dump( final DataOutputStream out ) throws IOException { 53 super.setIndex(getTargetOffset()); 54 if (super.getOpcode() == com.sun.org.apache.bcel.internal.Const.JSR) { 55 super.dump(out); 56 } else { // JSR_W 57 super.setIndex(getTargetOffset()); 58 out.writeByte(super.getOpcode()); 59 out.writeInt(super.getIndex()); 60 } 61 } 62 63 64 @Override 65 protected int updatePosition( final int offset, final int max_offset ) { 66 final int i = getTargetOffset(); // Depending on old position value 67 setPosition(getPosition() + offset); // Position may be shifted by preceding expansions 68 if (Math.abs(i) >= (Short.MAX_VALUE - max_offset)) { // to large for short (estimate) 69 super.setOpcode(com.sun.org.apache.bcel.internal.Const.JSR_W); 70 final short old_length = (short) super.getLength(); 71 super.setLength(5); 72 return super.getLength() - old_length; 73 } 74 return 0; 75 } 76 77 78 /** 79 * Call corresponding visitor method(s). The order is: 80 * Call visitor methods of implemented interfaces first, then 81 * call methods according to the class hierarchy in descending order, 82 * i.e., the most specific visitXXX() call comes last. 83 * 84 * @param v Visitor object 85 */ 86 @Override 87 public void accept( final Visitor v ) { 88 v.visitStackProducer(this); 89 v.visitVariableLengthInstruction(this); 90 v.visitBranchInstruction(this); 91 v.visitJsrInstruction(this); 92 v.visitJSR(this); 93 } 94 }