PackedSwitchMethodItem.java revision cb3e0ea38a669633b8daefd538750c8ded46f524 
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.PackedSwitchDataPseudoInstruction;
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 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