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 22package com.sun.org.apache.bcel.internal.generic; 23 24import java.io.*; 25import com.sun.org.apache.bcel.internal.util.ByteSequence; 26 27/** 28 * TABLESWITCH - Switch within given range of values, i.e., low..high 29 * 30 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 31 * @see SWITCH 32 */ 33public class TABLESWITCH extends Select { 34 /** 35 * Empty constructor needed for the Class.newInstance() statement in 36 * Instruction.readInstruction(). Not to be used otherwise. 37 */ 38 TABLESWITCH() {} 39 40 /** 41 * @param match sorted array of match values, match[0] must be low value, 42 * match[match_length - 1] high value 43 * @param targets where to branch for matched values 44 * @param target default branch 45 */ 46 public TABLESWITCH(int[] match, InstructionHandle[] targets, 47 InstructionHandle target) { 48 super(com.sun.org.apache.bcel.internal.Constants.TABLESWITCH, match, targets, target); 49 50 length = (short)(13 + match_length * 4); /* Alignment remainder assumed 51 * 0 here, until dump time */ 52 fixed_length = length; 53 } 54 55 /** 56 * Dump instruction as byte code to stream out. 57 * @param out Output stream 58 */ 59 public void dump(DataOutputStream out) throws IOException { 60 super.dump(out); 61 62 int low = (match_length > 0)? match[0] : 0; 63 out.writeInt(low); 64 65 int high = (match_length > 0)? match[match_length - 1] : 0; 66 out.writeInt(high); 67 68 for(int i=0; i < match_length; i++) // jump offsets 69 out.writeInt(indices[i] = getTargetOffset(targets[i])); 70 } 71 72 /** 73 * Read needed data (e.g. index) from file. 74 */ 75 protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException 76 { 77 super.initFromFile(bytes, wide); 78 79 int low = bytes.readInt(); 80 int high = bytes.readInt(); 81 82 match_length = high - low + 1; 83 fixed_length = (short)(13 + match_length * 4); 84 length = (short)(fixed_length + padding); 85 86 match = new int[match_length]; 87 indices = new int[match_length]; 88 targets = new InstructionHandle[match_length]; 89 90 for(int i=low; i <= high; i++) 91 match[i - low] = i; 92 93 for(int i=0; i < match_length; i++) { 94 indices[i] = bytes.readInt(); 95 } 96 } 97 98 99 /** 100 * Call corresponding visitor method(s). The order is: 101 * Call visitor methods of implemented interfaces first, then 102 * call methods according to the class hierarchy in descending order, 103 * i.e., the most specific visitXXX() call comes last. 104 * 105 * @param v Visitor object 106 */ 107 public void accept(Visitor v) { 108 v.visitVariableLengthInstruction(this); 109 v.visitStackProducer(this); 110 v.visitBranchInstruction(this); 111 v.visitSelect(this); 112 v.visitTABLESWITCH(this); 113 } 114} 115