Instruction22c.java revision 4af666e4a6dbcff1a68ebc3bc64fe813decb5920 
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.InstructionWithReference;
33import org.jf.dexlib.Code.Opcode;
34import org.jf.dexlib.Code.TwoRegisterInstruction;
35import org.jf.dexlib.DexFile;
36import org.jf.dexlib.Item;
37import org.jf.dexlib.Util.AnnotatedOutput;
38import org.jf.dexlib.Util.NumberUtils;
39
40public class Instruction22c extends InstructionWithReference implements TwoRegisterInstruction {
41    public static final Instruction.InstructionFactory Factory = new Factory();
42    private byte regA;
43    private byte regB;
44
45    public Instruction22c(Opcode opcode, byte regA, byte regB, Item referencedItem) {
46        super(opcode, referencedItem);
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    }
56
57    private Instruction22c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
58        super(dexFile, opcode, buffer, bufferIndex);
59
60        this.regA = NumberUtils.decodeLowUnsignedNibble(buffer[bufferIndex + 1]);
61        this.regB = NumberUtils.decodeHighUnsignedNibble(buffer[bufferIndex + 1]);
62    }
63
64    protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
65        if(getReferencedItem().getIndex() > 0xFFFF) {
66            if (opcode.hasJumboOpcode()) {
67                throw new RuntimeException(String.format("%s index is too large. Use the %s instruction instead.",
68                        opcode.referenceType.name(), opcode.getJumboOpcode().name));
69            } else {
70                throw new RuntimeException(String.format("%s index is too large.", opcode.referenceType.name()));
71            }
72        }
73
74        out.writeByte(opcode.value);
75        out.writeByte((regB << 4) | regA);
76        out.writeShort(getReferencedItem().getIndex());
77    }
78
79    public Format getFormat() {
80        return Format.Format22c;
81    }
82
83    public int getRegisterA() {
84        return regA;
85    }
86
87    public int getRegisterB() {
88        return regB;
89    }
90
91    private static class Factory implements Instruction.InstructionFactory {
92        public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
93            return new Instruction22c(dexFile, opcode, buffer, bufferIndex);
94        }
95    }
96}
97