SparseSwitchMethodItem.java revision fbea4e751fa6f1748ded4379a4b64601cb53ba7b 
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.baksmali.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        implements Iterable<LabelMethodItem> {
45    private final List<SparseSwitchTarget> targets;
46    private final boolean dead;
47
48    public SparseSwitchMethodItem(MethodDefinition methodDefinition, CodeItem codeItem, int codeAddress, boolean dead,
49                                  SparseSwitchDataPseudoInstruction instruction) {
50        super(codeItem, codeAddress, instruction);
51
52        int baseCodeAddress = methodDefinition.getSparseSwitchBaseAddress(codeAddress);
53
54        targets = new ArrayList<SparseSwitchTarget>();
55        Iterator<SparseSwitchDataPseudoInstruction.SparseSwitchTarget> iterator = instruction.iterateKeysAndTargets();
56        while (iterator.hasNext()) {
57            SparseSwitchDataPseudoInstruction.SparseSwitchTarget target = iterator.next();
58            SparseSwitchTarget sparseSwitchTarget = new SparseSwitchTarget();
59            sparseSwitchTarget.Key = target.key;
60
61            LabelMethodItem label = new LabelMethodItem(baseCodeAddress + target.targetAddressOffset, "sswitch_");
62            label = methodDefinition.getLabelCache().internLabel(label);
63            sparseSwitchTarget.Target = label;
64            label.setUncommented();
65
66            targets.add(sparseSwitchTarget);
67        }
68
69        this.dead = dead;
70    }
71
72    @Override
73    public boolean writeTo(IndentingWriter writer) throws IOException {
74        if (dead) {
75            writer.write("#.sparse-switch\n");
76            for (SparseSwitchTarget target: targets) {
77                IntegerRenderer.writeTo(writer, target.Key);
78                writer.write(" -> ");
79                target.Target.writeTo(writer);
80                writer.write('\n');
81            }
82            writer.write("#.end sparse-switch");
83        } else {
84            writer.write(".sparse-switch\n");
85            writer.indent(4);
86            for (SparseSwitchTarget target: targets) {
87                IntegerRenderer.writeTo(writer, target.Key);
88                writer.write(" -> ");
89                target.Target.writeTo(writer);
90                writer.write('\n');
91            }
92            writer.deindent(4);
93            writer.write(".end sparse-switch");
94        }
95        return true;
96    }
97
98    public Iterator<LabelMethodItem> iterator() {
99        return new Iterator<LabelMethodItem>() {
100            private Iterator<SparseSwitchTarget> iterator = targets.iterator();
101
102            public boolean hasNext() {
103                return iterator.hasNext();
104            }
105
106            public LabelMethodItem next() {
107                return iterator.next().Target;
108            }
109
110            public void remove() {
111                iterator.remove();
112            }
113        };
114    }
115
116    private static class SparseSwitchTarget {
117        public int Key;
118        public LabelMethodItem Target;
119    }
120}
121