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.LabelMethodItem; 32import org.jf.baksmali.Adaptors.MethodDefinition; 33import org.jf.util.IndentingWriter; 34import org.jf.baksmali.Renderers.IntegerRenderer; 35import org.jf.dexlib.Code.Format.SparseSwitchDataPseudoInstruction; 36import org.jf.dexlib.CodeItem; 37 38import java.io.IOException; 39import java.util.ArrayList; 40import java.util.Iterator; 41import java.util.List; 42 43public class SparseSwitchMethodItem extends InstructionMethodItem<SparseSwitchDataPseudoInstruction> { 44 private final List<SparseSwitchTarget> targets; 45 46 public SparseSwitchMethodItem(MethodDefinition methodDefinition, CodeItem codeItem, int codeAddress, 47 SparseSwitchDataPseudoInstruction instruction) { 48 super(codeItem, codeAddress, instruction); 49 50 int baseCodeAddress = methodDefinition.getSparseSwitchBaseAddress(codeAddress); 51 52 targets = new ArrayList<SparseSwitchTarget>(); 53 Iterator<SparseSwitchDataPseudoInstruction.SparseSwitchTarget> iterator = instruction.iterateKeysAndTargets(); 54 if (baseCodeAddress != 0) { 55 while (iterator.hasNext()) { 56 SparseSwitchDataPseudoInstruction.SparseSwitchTarget target = iterator.next(); 57 SparseSwitchLabelTarget sparseSwitchLabelTarget = new SparseSwitchLabelTarget(); 58 sparseSwitchLabelTarget.Key = target.key; 59 60 LabelMethodItem label = new LabelMethodItem(baseCodeAddress + target.targetAddressOffset, "sswitch_"); 61 label = methodDefinition.getLabelCache().internLabel(label); 62 sparseSwitchLabelTarget.Target = label; 63 64 targets.add(sparseSwitchLabelTarget); 65 } 66 } else { 67 //if we couldn't determine a base address, just use relative offsets rather than labels 68 while (iterator.hasNext()) { 69 SparseSwitchDataPseudoInstruction.SparseSwitchTarget target = iterator.next(); 70 SparseSwitchOffsetTarget sparseSwitchOffsetTarget = new SparseSwitchOffsetTarget(); 71 sparseSwitchOffsetTarget.Key = target.key; 72 73 sparseSwitchOffsetTarget.Target = target.targetAddressOffset; 74 targets.add(sparseSwitchOffsetTarget); 75 } 76 } 77 } 78 79 @Override 80 public boolean writeTo(IndentingWriter writer) throws IOException { 81 writer.write(".sparse-switch\n"); 82 writer.indent(4); 83 for (SparseSwitchTarget target: targets) { 84 IntegerRenderer.writeTo(writer, target.Key); 85 writer.write(" -> "); 86 target.writeTargetTo(writer); 87 writer.write('\n'); 88 } 89 writer.deindent(4); 90 writer.write(".end sparse-switch"); 91 return true; 92 } 93 94 private static abstract class SparseSwitchTarget { 95 public int Key; 96 public abstract void writeTargetTo(IndentingWriter writer) throws IOException; 97 } 98 99 private static class SparseSwitchLabelTarget extends SparseSwitchTarget { 100 public LabelMethodItem Target; 101 public void writeTargetTo(IndentingWriter writer) throws IOException { 102 Target.writeTo(writer); 103 } 104 } 105 106 private static class SparseSwitchOffsetTarget extends SparseSwitchTarget { 107 public int Target; 108 public void writeTargetTo(IndentingWriter writer) throws IOException { 109 if (Target >= 0) { 110 writer.write('+'); 111 } 112 writer.printSignedIntAsDec(Target); 113 } 114 } 115} 116