Instruction22x.java revision b3abca4c90929e31e6a8c52bc0178c44e3e53c6b 
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.dexlib.Code.Format;
30
31import org.jf.dexlib.Code.Instruction;
32import org.jf.dexlib.Code.Opcode;
33import org.jf.dexlib.Code.TwoRegisterInstruction;
34import org.jf.dexlib.DexFile;
35import org.jf.dexlib.Util.AnnotatedOutput;
36import org.jf.dexlib.Util.NumberUtils;
37
38public class Instruction22x extends Instruction implements TwoRegisterInstruction {
39    public static final Instruction.InstructionFactory Factory = new Factory();
40    private byte regA;
41    private short regB;
42
43    public Instruction22x(Opcode opcode, short regA, int regB) {
44        super(opcode);
45
46        if (regA >= 1 << 8) {
47            throw new RuntimeException("The register number must be less than v16");
48        }
49
50        if (regB >= 1 << 16) {
51            throw new RuntimeException("The register number must be less than v65536");
52        }
53
54        this.regA = (byte)regA;
55        this.regB = (short)regB;
56    }
57
58    private Instruction22x(Opcode opcode, byte[] buffer, int bufferIndex) {
59        super(opcode);
60
61        this.regA = buffer[bufferIndex + 1];
62        this.regB = (short)NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 2);
63    }
64
65    protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
66        out.writeByte(opcode.value);
67        out.writeByte(regA);
68        out.writeShort(regB);
69    }
70
71    public Format getFormat() {
72        return Format.Format22x;
73    }
74
75    public int getRegisterA() {
76        return regA & 0xFF;
77    }
78
79    public int getRegisterB() {
80        return regB & 0xFFFF;
81    }
82
83    private static class Factory implements Instruction.InstructionFactory {
84        public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
85            return new Instruction22x(opcode, buffer, bufferIndex);
86        }
87    }
88}
89