| /* |
| * 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.DataOutputStream; |
| import java.io.IOException; |
| |
| /** |
| * GOTO - Branch always (to relative offset, not absolute address) |
| * |
| */ |
| public class GOTO extends GotoInstruction implements VariableLengthInstruction { |
| |
| /** |
| * Empty constructor needed for Instruction.readInstruction. |
| * Not to be used otherwise. |
| */ |
| GOTO() { |
| } |
| |
| |
| public GOTO(final InstructionHandle target) { |
| super(com.sun.org.apache.bcel.internal.Const.GOTO, target); |
| } |
| |
| |
| /** |
| * Dump instruction as byte code to stream out. |
| * @param out Output stream |
| */ |
| @Override |
| public void dump( final DataOutputStream out ) throws IOException { |
| super.setIndex(getTargetOffset()); |
| final short _opcode = getOpcode(); |
| if (_opcode == com.sun.org.apache.bcel.internal.Const.GOTO) { |
| super.dump(out); |
| } else { // GOTO_W |
| super.setIndex(getTargetOffset()); |
| out.writeByte(_opcode); |
| out.writeInt(super.getIndex()); |
| } |
| } |
| |
| |
| /** |
| * Called in pass 2 of InstructionList.setPositions() in order to update |
| * the branch target, that may shift due to variable length instructions. |
| * |
| * @param offset additional offset caused by preceding (variable length) instructions |
| * @param max_offset the maximum offset that may be caused by these instructions |
| * @return additional offset caused by possible change of this instruction's length |
| */ |
| @Override |
| protected int updatePosition( final int offset, final int max_offset ) { |
| final int i = getTargetOffset(); // Depending on old position value |
| setPosition(getPosition() + offset); // Position may be shifted by preceding expansions |
| if (Math.abs(i) >= (Short.MAX_VALUE - max_offset)) { // to large for short (estimate) |
| super.setOpcode(com.sun.org.apache.bcel.internal.Const.GOTO_W); |
| final short old_length = (short) super.getLength(); |
| super.setLength(5); |
| return super.getLength() - 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( final Visitor v ) { |
| v.visitVariableLengthInstruction(this); |
| v.visitUnconditionalBranch(this); |
| v.visitBranchInstruction(this); |
| v.visitGotoInstruction(this); |
| v.visitGOTO(this); |
| } |
| } |