001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020import java.io.DataOutputStream; 021import java.io.IOException; 022 023import org.apache.bcel.util.ByteSequence; 024 025/** 026 * TABLESWITCH - Switch within given range of values, i.e., low..high 027 * 028 * @see SWITCH 029 */ 030public class TABLESWITCH extends Select { 031 032 /** 033 * Empty constructor needed for Instruction.readInstruction. 034 * Not to be used otherwise. 035 */ 036 TABLESWITCH() { 037 } 038 039 040 /** 041 * @param match sorted array of match values, match[0] must be low value, 042 * match[match_length - 1] high value 043 * @param targets where to branch for matched values 044 * @param defaultTarget default branch 045 */ 046 public TABLESWITCH(final int[] match, final InstructionHandle[] targets, final InstructionHandle defaultTarget) { 047 super(org.apache.bcel.Const.TABLESWITCH, match, targets, defaultTarget); 048 /* Alignment remainder assumed 0 here, until dump time */ 049 final short _length = (short) (13 + getMatch_length() * 4); 050 super.setLength(_length); 051 setFixed_length(_length); 052 } 053 054 055 /** 056 * Dump instruction as byte code to stream out. 057 * @param out Output stream 058 */ 059 @Override 060 public void dump( final DataOutputStream out ) throws IOException { 061 super.dump(out); 062 final int _match_length = getMatch_length(); 063 final int low = (_match_length > 0) ? super.getMatch(0) : 0; 064 out.writeInt(low); 065 final int high = (_match_length > 0) ? super.getMatch(_match_length - 1) : 0; 066 out.writeInt(high); 067 for (int i = 0; i < _match_length; i++) { 068 out.writeInt(setIndices(i, getTargetOffset(super.getTarget(i)))); 069 } 070 } 071 072 073 /** 074 * Read needed data (e.g. index) from file. 075 */ 076 @Override 077 protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { 078 super.initFromFile(bytes, wide); 079 final int low = bytes.readInt(); 080 final int high = bytes.readInt(); 081 final int _match_length = high - low + 1; 082 setMatch_length(_match_length); 083 final short _fixed_length = (short) (13 + _match_length * 4); 084 setFixed_length(_fixed_length); 085 super.setLength((short) (_fixed_length + super.getPadding())); 086 super.setMatches(new int[_match_length]); 087 super.setIndices(new int[_match_length]); 088 super.setTargets(new InstructionHandle[_match_length]); 089 for (int i = 0; i < _match_length; i++) { 090 super.setMatch(i, low + i); 091 super.setIndices(i, bytes.readInt()); 092 } 093 } 094 095 096 /** 097 * Call corresponding visitor method(s). The order is: 098 * Call visitor methods of implemented interfaces first, then 099 * call methods according to the class hierarchy in descending order, 100 * i.e., the most specific visitXXX() call comes last. 101 * 102 * @param v Visitor object 103 */ 104 @Override 105 public void accept( final Visitor v ) { 106 v.visitVariableLengthInstruction(this); 107 v.visitStackConsumer(this); 108 v.visitBranchInstruction(this); 109 v.visitSelect(this); 110 v.visitTABLESWITCH(this); 111 } 112}