Instruction21h.java revision 9a295c54e1ecfffe0afa712ddc40d46c7e07ac2c 
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.EncodedLiteralInstruction;
32import org.jf.dexlib.Code.Instruction;
33import org.jf.dexlib.Code.Opcode;
34import org.jf.dexlib.Code.SingleRegisterInstruction;
35import org.jf.dexlib.DexFile;
36import org.jf.dexlib.Util.AnnotatedOutput;
37import org.jf.dexlib.Util.NumberUtils;
38
39public class Instruction21h extends Instruction implements SingleRegisterInstruction, EncodedLiteralInstruction {
40    public static final Instruction.InstructionFactory Factory = new Factory();
41    private byte regA;
42    private short litB;
43
44    public Instruction21h(Opcode opcode, short regA, short litB) {
45        super(opcode);
46
47        if (regA >= 1 << 8) {
48            throw new RuntimeException("The register number must be less than v256");
49        }
50
51        this.regA = (byte)regA;
52        this.litB = litB;
53    }
54
55    private Instruction21h(Opcode opcode, byte[] buffer, int bufferIndex) {
56        super(opcode);
57
58        this.regA = buffer[bufferIndex + 1];
59        this.litB = NumberUtils.decodeShort(buffer, bufferIndex + 2);
60    }
61
62    protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
63        out.writeByte(opcode.value);
64        out.writeByte(regA);
65        out.writeShort(litB);
66    }
67
68    public Format getFormat() {
69        return Format.Format21h;
70    }
71
72    public int getRegisterA() {
73        return regA & 0xFF;
74    }
75
76    public long getLiteral() {
77        return litB;
78    }
79
80    public long getDecodedLiteral() {
81        if (opcode == Opcode.CONST_HIGH16) {
82            return litB << 16;
83        } else {
84            assert opcode == Opcode.CONST_WIDE_HIGH16;
85            return ((long)litB) << 48;
86        }
87    }
88
89    private static class Factory implements Instruction.InstructionFactory {
90        public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
91            return new Instruction21h(opcode, buffer, bufferIndex);
92        }
93    }
94}
95