1/* 2 * [The "BSD licence"] 3 * Copyright (c) 2010 Ben Gruver (JesusFreke) 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29package org.jf.baksmali.Adaptors.Format; 30 31import org.jf.baksmali.Adaptors.CommentingIndentingWriter; 32import org.jf.baksmali.Adaptors.LabelMethodItem; 33import org.jf.baksmali.Adaptors.MethodDefinition; 34import org.jf.dexlib2.iface.instruction.SwitchElement; 35import org.jf.dexlib2.iface.instruction.formats.PackedSwitchPayload; 36import org.jf.util.IndentingWriter; 37import org.jf.baksmali.Renderers.IntegerRenderer; 38 39import java.io.IOException; 40import java.util.ArrayList; 41import java.util.List; 42 43public class PackedSwitchMethodItem extends InstructionMethodItem<PackedSwitchPayload> { 44 private final List<PackedSwitchTarget> targets; 45 private final int firstKey; 46 47 // Whether this sparse switch instruction should be commented out because it is never referenced 48 private boolean commentedOut; 49 50 public PackedSwitchMethodItem(MethodDefinition methodDef, int codeAddress, PackedSwitchPayload instruction) { 51 super(methodDef, codeAddress, instruction); 52 53 int baseCodeAddress = methodDef.getPackedSwitchBaseAddress(codeAddress); 54 55 targets = new ArrayList<PackedSwitchTarget>(); 56 57 boolean first = true; 58 int firstKey = 0; 59 if (baseCodeAddress >= 0) { 60 for (SwitchElement switchElement: instruction.getSwitchElements()) { 61 if (first) { 62 firstKey = switchElement.getKey(); 63 first = false; 64 } 65 LabelMethodItem label = methodDef.getLabelCache().internLabel( 66 new LabelMethodItem(methodDef.classDef.options, baseCodeAddress + switchElement.getOffset(), 67 "pswitch_")); 68 targets.add(new PackedSwitchLabelTarget(label)); 69 } 70 } else { 71 commentedOut = true; 72 for (SwitchElement switchElement: instruction.getSwitchElements()) { 73 if (first) { 74 firstKey = switchElement.getKey(); 75 first = false; 76 } 77 targets.add(new PackedSwitchOffsetTarget(switchElement.getOffset())); 78 } 79 } 80 this.firstKey = firstKey; 81 } 82 83 @Override 84 public boolean writeTo(IndentingWriter writer) throws IOException { 85 if (commentedOut) { 86 writer = new CommentingIndentingWriter(writer); 87 } 88 writer.write(".packed-switch "); 89 IntegerRenderer.writeTo(writer, firstKey); 90 writer.indent(4); 91 writer.write('\n'); 92 int key = firstKey; 93 for (PackedSwitchTarget target: targets) { 94 target.writeTargetTo(writer); 95 writeCommentIfResourceId(writer, key); 96 writer.write('\n'); 97 key++; 98 } 99 writer.deindent(4); 100 writer.write(".end packed-switch"); 101 return true; 102 } 103 104 private static abstract class PackedSwitchTarget { 105 public abstract void writeTargetTo(IndentingWriter writer) throws IOException; 106 } 107 108 private static class PackedSwitchLabelTarget extends PackedSwitchTarget { 109 private final LabelMethodItem target; 110 public PackedSwitchLabelTarget(LabelMethodItem target) { 111 this.target = target; 112 } 113 public void writeTargetTo(IndentingWriter writer) throws IOException { 114 target.writeTo(writer); 115 } 116 } 117 118 private static class PackedSwitchOffsetTarget extends PackedSwitchTarget { 119 private final int target; 120 public PackedSwitchOffsetTarget(int target) { 121 this.target = target; 122 } 123 public void writeTargetTo(IndentingWriter writer) throws IOException { 124 if (target >= 0) { 125 writer.write('+'); 126 } 127 writer.printSignedIntAsDec(target); 128 } 129 } 130} 131