1/*
2 * Copyright 2011, Google Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 *     * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *     * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *     * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32package org.jf.dexlib.Code.Format;
33
34import org.jf.dexlib.Code.Instruction;
35import org.jf.dexlib.Code.InstructionWithReference;
36import org.jf.dexlib.Code.Opcode;
37import org.jf.dexlib.Code.SingleRegisterInstruction;
38import org.jf.dexlib.DexFile;
39import org.jf.dexlib.Item;
40import org.jf.dexlib.TypeIdItem;
41import org.jf.dexlib.Util.AnnotatedOutput;
42import org.jf.dexlib.Util.NumberUtils;
43
44public class Instruction41c extends InstructionWithJumboReference implements SingleRegisterInstruction {
45    public static final InstructionFactory Factory = new Factory();
46    private short regA;
47
48    public Instruction41c(Opcode opcode, int regA, Item referencedItem) {
49        super(opcode, referencedItem);
50
51        if (regA >= 1 << 16) {
52            throw new RuntimeException("The register number must be less than v65536");
53        }
54
55        if (opcode == Opcode.NEW_INSTANCE_JUMBO) {
56            assert referencedItem instanceof TypeIdItem;
57            if (((TypeIdItem)referencedItem).getTypeDescriptor().charAt(0) != 'L') {
58                throw new RuntimeException("Only class references can be used with the new-instance/jumbo opcode");
59            }
60        }
61
62        this.regA = (short)regA;
63    }
64
65    private Instruction41c(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
66        super(dexFile, opcode, buffer, bufferIndex);
67
68        if (opcode == Opcode.NEW_INSTANCE_JUMBO &&
69                ((TypeIdItem)this.getReferencedItem()).getTypeDescriptor().charAt(0) != 'L') {
70
71            throw new RuntimeException("Only class references can be used with the new-instance/jumbo opcode");
72        }
73
74        this.regA = (short)NumberUtils.decodeUnsignedShort(buffer, bufferIndex + 6);
75    }
76
77    protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
78        out.writeByte(0xFF);
79        out.writeByte(opcode.value);
80        out.writeInt(getReferencedItem().getIndex());
81        out.writeShort(getRegisterA());
82    }
83
84    public Format getFormat() {
85        return Format.Format41c;
86    }
87
88    public int getRegisterA() {
89        return regA & 0xFFFF;
90    }
91
92    private static class Factory implements InstructionFactory {
93        public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
94            return new Instruction41c(dexFile, opcode, buffer, bufferIndex);
95        }
96    }
97}
98