Instruction22s.java revision 4238ac2dd12461e285472dedfc0e53669b5aec35 
1/*
2 * [The "BSD licence"]
3 * Copyright (c) 2009 Ben Gruver
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.dexlib.Code.Format;
30
31import org.jf.dexlib.Code.Instruction;
32import org.jf.dexlib.Code.LiteralInstruction;
33import org.jf.dexlib.Code.Opcode;
34import org.jf.dexlib.Code.TwoRegisterInstruction;
35import org.jf.dexlib.DexFile;
36import org.jf.dexlib.Util.NumberUtils;
37import org.jf.dexlib.Util.AnnotatedOutput;
38
39public class Instruction22s extends Instruction implements TwoRegisterInstruction, LiteralInstruction {
40    public static final Instruction.InstructionFactory Factory = new Factory();
41    private byte regA;
42    private byte regB;
43    private short litC;
44
45    public Instruction22s(Opcode opcode, byte regA, byte regB, short litC) {
46        super(opcode);
47
48        if (regA >= 1 << 4 ||
49                regB >= 1 << 4) {
50            throw new RuntimeException("The register number must be less than v16");
51        }
52
53        this.regA = regA;
54        this.regB = regB;
55        this.litC = litC;
56    }
57
58    private Instruction22s(Opcode opcode, byte[] buffer, int bufferIndex) {
59        super(opcode);
60
61        this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]);
62        this.regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]);
63        this.litC = NumberUtils.decodeShort(buffer, bufferIndex + 2);
64    }
65
66    protected void writeInstruction(AnnotatedOutput out, int currentCodeOffset) {
67        out.writeByte(opcode.value);
68        out.writeByte((regB << 4) | regA);
69        out.writeShort(litC);
70    }
71
72    public Format getFormat() {
73        return Format.Format22s;
74    }
75
76    public int getRegisterA() {
77        return regA;
78    }
79
80    public int getRegisterB() {
81        return regB;
82    }
83
84    public long getLiteral() {
85        return litC;
86    }
87
88    private static class Factory implements Instruction.InstructionFactory {
89        public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
90            return new Instruction22s(opcode, buffer, bufferIndex);
91        }
92    }
93}
94