| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| package org.apache.bcel.generic; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * JSR - Jump to subroutine |
| * |
| * @version $Id$ |
| * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> |
| */ |
| public class JSR extends JsrInstruction implements VariableLengthInstruction { |
| |
| private static final long serialVersionUID = 7425681395340093184L; |
| |
| |
| /** |
| * Empty constructor needed for the Class.newInstance() statement in |
| * Instruction.readInstruction(). Not to be used otherwise. |
| */ |
| JSR() { |
| } |
| |
| |
| public JSR(InstructionHandle target) { |
| super(org.apache.bcel.Constants.JSR, target); |
| } |
| |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| @Override |
| public void dump( DataOutputStream out ) throws IOException { |
| index = getTargetOffset(); |
| if (opcode == org.apache.bcel.Constants.JSR) { |
| super.dump(out); |
| } else { // JSR_W |
| index = getTargetOffset(); |
| out.writeByte(opcode); |
| out.writeInt(index); |
| } |
| } |
| |
| |
| @Override |
| protected int updatePosition( int offset, int max_offset ) { |
| int i = getTargetOffset(); // Depending on old position value |
| position += offset; // Position may be shifted by preceding expansions |
| if (Math.abs(i) >= (32767 - max_offset)) { // to large for short (estimate) |
| opcode = org.apache.bcel.Constants.JSR_W; |
| short old_length = length; |
| length = 5; |
| return length - old_length; |
| } |
| return 0; |
| } |
| |
| |
| /** |
| * Call corresponding visitor method(s). The order is: |
| * Call visitor methods of implemented interfaces first, then |
| * call methods according to the class hierarchy in descending order, |
| * i.e., the most specific visitXXX() call comes last. |
| * |
| * @param v Visitor object |
| */ |
| @Override |
| public void accept( Visitor v ) { |
| v.visitStackProducer(this); |
| v.visitVariableLengthInstruction(this); |
| v.visitBranchInstruction(this); |
| v.visitJsrInstruction(this); |
| v.visitJSR(this); |
| } |
| } |