SparseSwitchMethodItem.java revision 754b3c4dc009b7a02e39001560c3f0fd6a7cc2c0 
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.dexlib2.iface.instruction.SwitchElement;
34import org.jf.dexlib2.iface.instruction.formats.SparseSwitchPayload;
35import org.jf.util.IndentingWriter;
36import org.jf.baksmali.Renderers.IntegerRenderer;
37
38import java.io.IOException;
39import java.util.ArrayList;
40import java.util.List;
41
42public class SparseSwitchMethodItem extends InstructionMethodItem<SparseSwitchPayload> {
43    private final List<SparseSwitchTarget> targets;
44
45    public SparseSwitchMethodItem(MethodDefinition methodDef, int codeAddress, SparseSwitchPayload instruction) {
46        super(methodDef, codeAddress, instruction);
47
48        int baseCodeAddress = methodDef.getSparseSwitchBaseAddress(codeAddress);
49
50        targets = new ArrayList<SparseSwitchTarget>();
51        if (baseCodeAddress >= 0) {
52            for (SwitchElement switchElement: instruction.getSwitchElements()) {
53                LabelMethodItem label = new LabelMethodItem(baseCodeAddress + switchElement.getOffset(), "sswitch_");
54                targets.add(new SparseSwitchLabelTarget(switchElement.getKey(), label));
55            }
56        } else {
57            //if we couldn't determine a base address, just use relative offsets rather than labels
58            for (SwitchElement switchElement: instruction.getSwitchElements()) {
59                targets.add(new SparseSwitchOffsetTarget(switchElement.getKey(), switchElement.getOffset()));
60            }
61        }
62    }
63
64    @Override
65    public boolean writeTo(IndentingWriter writer) throws IOException {
66        writer.write(".sparse-switch\n");
67        writer.indent(4);
68        for (SparseSwitchTarget target: targets) {
69            IntegerRenderer.writeTo(writer, target.getKey());
70            writer.write(" -> ");
71            target.writeTargetTo(writer);
72            writer.write('\n');
73        }
74        writer.deindent(4);
75        writer.write(".end sparse-switch");
76        return true;
77    }
78
79    private static abstract class SparseSwitchTarget {
80        private final int key;
81        public SparseSwitchTarget(int key) {
82            this.key = key;
83        }
84        public int getKey() { return key; }
85        public abstract void writeTargetTo(IndentingWriter writer) throws IOException;
86    }
87
88    private static class SparseSwitchLabelTarget extends SparseSwitchTarget {
89        private final LabelMethodItem target;
90        public SparseSwitchLabelTarget(int key, LabelMethodItem target) {
91            super(key);
92            this.target = target;
93        }
94
95        public void writeTargetTo(IndentingWriter writer) throws IOException {
96            target.writeTo(writer);
97        }
98    }
99
100    private static class SparseSwitchOffsetTarget extends SparseSwitchTarget {
101        private final int target;
102        public SparseSwitchOffsetTarget(int key, int target) {
103            super(key);
104            this.target = target;
105        }
106
107        public void writeTargetTo(IndentingWriter writer) throws IOException {
108            if (target >= 0) {
109                writer.write('+');
110            }
111            writer.printSignedIntAsDec(target);
112        }
113    }
114}
115