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      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 
     29 package org.jf.baksmali.Adaptors.Format;
     30 
     31 import org.jf.baksmali.Adaptors.LabelMethodItem;
     32 import org.jf.baksmali.Adaptors.MethodDefinition;
     33 import org.jf.util.IndentingWriter;
     34 import org.jf.baksmali.Renderers.IntegerRenderer;
     35 import org.jf.dexlib.Code.Format.PackedSwitchDataPseudoInstruction;
     36 import org.jf.dexlib.CodeItem;
     37 
     38 import java.io.IOException;
     39 import java.util.ArrayList;
     40 import java.util.Iterator;
     41 import java.util.List;
     42 
     43 public class PackedSwitchMethodItem extends InstructionMethodItem<PackedSwitchDataPseudoInstruction> {
     44     private final List<PackedSwitchTarget> targets;
     45 
     46     public PackedSwitchMethodItem(MethodDefinition methodDefinition, CodeItem codeItem, int codeAddress,
     47                                   PackedSwitchDataPseudoInstruction instruction) {
     48         super(codeItem, codeAddress, instruction);
     49 
     50         int baseCodeAddress = methodDefinition.getPackedSwitchBaseAddress(codeAddress);
     51 
     52         targets = new ArrayList<PackedSwitchTarget>();
     53         Iterator<PackedSwitchDataPseudoInstruction.PackedSwitchTarget> iterator = instruction.iterateKeysAndTargets();
     54 
     55         if (baseCodeAddress >= 0) {
     56             while (iterator.hasNext()) {
     57                 PackedSwitchDataPseudoInstruction.PackedSwitchTarget target = iterator.next();
     58                 PackedSwitchLabelTarget packedSwitchLabelTarget = new PackedSwitchLabelTarget();
     59 
     60 
     61                 LabelMethodItem label = new LabelMethodItem(baseCodeAddress + target.targetAddressOffset, "pswitch_");
     62                 label = methodDefinition.getLabelCache().internLabel(label);
     63                 packedSwitchLabelTarget.Target = label;
     64                 targets.add(packedSwitchLabelTarget);
     65             }
     66         } else {
     67             while (iterator.hasNext()) {
     68                 PackedSwitchDataPseudoInstruction.PackedSwitchTarget target = iterator.next();
     69                 PackedSwitchOffsetTarget packedSwitchOffsetTarget = new PackedSwitchOffsetTarget();
     70 
     71 
     72                 packedSwitchOffsetTarget.Target = target.targetAddressOffset;
     73                 targets.add(packedSwitchOffsetTarget);
     74             }
     75         }
     76     }
     77 
     78     @Override
     79     public boolean writeTo(IndentingWriter writer) throws IOException {
     80         writer.write(".packed-switch ");
     81         IntegerRenderer.writeTo(writer, instruction.getFirstKey());
     82         writer.indent(4);
     83         writer.write('\n');
     84         for (PackedSwitchTarget target: targets) {
     85             target.writeTargetTo(writer);
     86             writer.write('\n');
     87         }
     88         writer.deindent(4);
     89         writer.write(".end packed-switch");
     90         return true;
     91     }
     92 
     93     private static abstract class PackedSwitchTarget {
     94         public abstract void writeTargetTo(IndentingWriter writer) throws IOException;
     95     }
     96 
     97     private static class PackedSwitchLabelTarget extends PackedSwitchTarget {
     98         public LabelMethodItem Target;
     99         public void writeTargetTo(IndentingWriter writer) throws IOException {
    100             Target.writeTo(writer);
    101         }
    102     }
    103 
    104     private static class PackedSwitchOffsetTarget extends PackedSwitchTarget {
    105         public int Target;
    106         public void writeTargetTo(IndentingWriter writer) throws IOException {
    107             if (Target >= 0) {
    108                 writer.write('+');
    109             }
    110             writer.printSignedIntAsDec(Target);
    111         }
    112     }
    113 }
    114