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.SparseSwitchPayload; 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 SparseSwitchMethodItem extends InstructionMethodItem<SparseSwitchPayload> { 44 private final List<SparseSwitchTarget> targets; 45 46 // Whether this sparse switch instruction should be commented out because it is never referenced 47 private boolean commentedOut; 48 49 public SparseSwitchMethodItem(MethodDefinition methodDef, int codeAddress, SparseSwitchPayload instruction) { 50 super(methodDef, codeAddress, instruction); 51 52 int baseCodeAddress = methodDef.getSparseSwitchBaseAddress(codeAddress); 53 54 targets = new ArrayList<SparseSwitchTarget>(); 55 if (baseCodeAddress >= 0) { 56 for (SwitchElement switchElement: instruction.getSwitchElements()) { 57 LabelMethodItem label = methodDef.getLabelCache().internLabel( 58 new LabelMethodItem( methodDef.classDef.options, baseCodeAddress + switchElement.getOffset(), 59 "sswitch_")); 60 targets.add(new SparseSwitchLabelTarget(switchElement.getKey(), label)); 61 } 62 } else { 63 commentedOut = true; 64 //if we couldn't determine a base address, just use relative offsets rather than labels 65 for (SwitchElement switchElement: instruction.getSwitchElements()) { 66 targets.add(new SparseSwitchOffsetTarget(switchElement.getKey(), switchElement.getOffset())); 67 } 68 } 69 } 70 71 @Override 72 public boolean writeTo(IndentingWriter writer) throws IOException { 73 if (commentedOut) { 74 writer = new CommentingIndentingWriter(writer); 75 } 76 77 writer.write(".sparse-switch\n"); 78 writer.indent(4); 79 for (SparseSwitchTarget target: targets) { 80 IntegerRenderer.writeTo(writer, target.getKey()); 81 writer.write(" -> "); 82 target.writeTargetTo(writer); 83 writeCommentIfResourceId(writer, target.getKey()); 84 writer.write('\n'); 85 } 86 writer.deindent(4); 87 writer.write(".end sparse-switch"); 88 return true; 89 } 90 91 private static abstract class SparseSwitchTarget { 92 private final int key; 93 public SparseSwitchTarget(int key) { 94 this.key = key; 95 } 96 public int getKey() { return key; } 97 public abstract void writeTargetTo(IndentingWriter writer) throws IOException; 98 } 99 100 private static class SparseSwitchLabelTarget extends SparseSwitchTarget { 101 private final LabelMethodItem target; 102 public SparseSwitchLabelTarget(int key, LabelMethodItem target) { 103 super(key); 104 this.target = target; 105 } 106 107 public void writeTargetTo(IndentingWriter writer) throws IOException { 108 target.writeTo(writer); 109 } 110 } 111 112 private static class SparseSwitchOffsetTarget extends SparseSwitchTarget { 113 private final int target; 114 public SparseSwitchOffsetTarget(int key, int target) { 115 super(key); 116 this.target = target; 117 } 118 119 public void writeTargetTo(IndentingWriter writer) throws IOException { 120 if (target >= 0) { 121 writer.write('+'); 122 } 123 writer.printSignedIntAsDec(target); 124 } 125 } 126} 127