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.PackedSwitchPayload;
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 PackedSwitchMethodItem extends InstructionMethodItem<PackedSwitchPayload> {
44    private final List<PackedSwitchTarget> targets;
45    private final int firstKey;
46
47    // Whether this sparse switch instruction should be commented out because it is never referenced
48    private boolean commentedOut;
49
50    public PackedSwitchMethodItem(MethodDefinition methodDef, int codeAddress, PackedSwitchPayload instruction) {
51        super(methodDef, codeAddress, instruction);
52
53        int baseCodeAddress = methodDef.getPackedSwitchBaseAddress(codeAddress);
54
55        targets = new ArrayList<PackedSwitchTarget>();
56
57        boolean first = true;
58        int firstKey = 0;
59        if (baseCodeAddress >= 0) {
60            for (SwitchElement switchElement: instruction.getSwitchElements()) {
61                if (first) {
62                    firstKey = switchElement.getKey();
63                    first = false;
64                }
65                LabelMethodItem label = methodDef.getLabelCache().internLabel(
66                        new LabelMethodItem(methodDef.classDef.options, baseCodeAddress + switchElement.getOffset(),
67                                "pswitch_"));
68                targets.add(new PackedSwitchLabelTarget(label));
69            }
70        } else {
71            commentedOut = true;
72            for (SwitchElement switchElement: instruction.getSwitchElements()) {
73                if (first) {
74                    firstKey = switchElement.getKey();
75                    first = false;
76                }
77                targets.add(new PackedSwitchOffsetTarget(switchElement.getOffset()));
78            }
79        }
80        this.firstKey = firstKey;
81    }
82
83    @Override
84    public boolean writeTo(IndentingWriter writer) throws IOException {
85        if (commentedOut) {
86            writer = new CommentingIndentingWriter(writer);
87        }
88        writer.write(".packed-switch ");
89        IntegerRenderer.writeTo(writer, firstKey);
90        writer.indent(4);
91        writer.write('\n');
92        int key = firstKey;
93        for (PackedSwitchTarget target: targets) {
94            target.writeTargetTo(writer);
95            writeCommentIfResourceId(writer, key);
96            writer.write('\n');
97            key++;
98        }
99        writer.deindent(4);
100        writer.write(".end packed-switch");
101        return true;
102    }
103
104    private static abstract class PackedSwitchTarget {
105        public abstract void writeTargetTo(IndentingWriter writer) throws IOException;
106    }
107
108    private static class PackedSwitchLabelTarget extends PackedSwitchTarget {
109        private final LabelMethodItem target;
110        public PackedSwitchLabelTarget(LabelMethodItem target) {
111            this.target = target;
112        }
113        public void writeTargetTo(IndentingWriter writer) throws IOException {
114            target.writeTo(writer);
115        }
116    }
117
118    private static class PackedSwitchOffsetTarget extends PackedSwitchTarget {
119        private final int target;
120        public PackedSwitchOffsetTarget(int target) {
121            this.target = target;
122        }
123        public void writeTargetTo(IndentingWriter writer) throws IOException {
124            if (target >= 0) {
125                writer.write('+');
126            }
127            writer.printSignedIntAsDec(target);
128        }
129    }
130}
131