| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 com.sun.org.apache.bcel.internal.generic; |
| |
| import java.io.*; |
| |
| /** |
| * GOTO - Branch always (to relative offset, not absolute address) |
| * |
| * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> |
| */ |
| public class GOTO extends GotoInstruction implements VariableLengthInstruction { |
| /** |
| * Empty constructor needed for the Class.newInstance() statement in |
| * Instruction.readInstruction(). Not to be used otherwise. |
| */ |
| GOTO() {} |
| |
| public GOTO(InstructionHandle target) { |
| super(com.sun.org.apache.bcel.internal.Constants.GOTO, target); |
| } |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| public void dump(DataOutputStream out) throws IOException { |
| index = getTargetOffset(); |
| if(opcode == com.sun.org.apache.bcel.internal.Constants.GOTO) |
| super.dump(out); |
| else { // GOTO_W |
| index = getTargetOffset(); |
| out.writeByte(opcode); |
| out.writeInt(index); |
| } |
| } |
| |
| /** Called in pass 2 of InstructionList.setPositions() in order to update |
| * the branch target, that may shift due to variable length instructions. |
| */ |
| 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 = com.sun.org.apache.bcel.internal.Constants.GOTO_W; |
| length = 5; |
| return 2; // 5 - 3 |
| } |
| |
| 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 |
| */ |
| public void accept(Visitor v) { |
| v.visitVariableLengthInstruction(this); |
| v.visitUnconditionalBranch(this); |
| v.visitBranchInstruction(this); |
| v.visitGotoInstruction(this); |
| v.visitGOTO(this); |
| } |
| } |