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.OffsetInstruction;
33import org.jf.dexlib.Code.Opcode;
34import org.jf.dexlib.DexFile;
35import org.jf.dexlib.Util.AnnotatedOutput;
36
37public class Instruction10t extends OffsetInstruction {
38    public static final InstructionFactory Factory = new Factory();
39    private int targetAddressOffset;
40
41    public Instruction10t(Opcode opcode, int offA) {
42        super(opcode);
43        this.targetAddressOffset = offA;
44
45        if (targetAddressOffset == 0) {
46            throw new RuntimeException("The address offset cannot be 0. Use goto/32 instead.");
47        }
48
49        //allow out of range address offsets here, so we have the option of replacing this instruction
50        //with goto/16 or goto/32 later
51    }
52
53    private Instruction10t(Opcode opcode, byte[] buffer, int bufferIndex) {
54        super(opcode);
55
56        assert buffer[bufferIndex] == opcode.value;
57
58        this.targetAddressOffset = buffer[bufferIndex + 1];
59        assert targetAddressOffset != 0;
60    }
61
62    protected void writeInstruction(AnnotatedOutput out, int currentCodeAddress) {
63        if (targetAddressOffset == 0) {
64            throw new RuntimeException("The address offset cannot be 0. Use goto/32 instead");
65        }
66
67        if (targetAddressOffset < -128 || targetAddressOffset > 127) {
68            throw new RuntimeException("The address offset is out of range. It must be in [-128,-1] or [1, 127]");
69        }
70
71        out.writeByte(opcode.value);
72        out.writeByte(targetAddressOffset);
73    }
74
75    public void updateTargetAddressOffset(int targetAddressOffset) {
76        this.targetAddressOffset = targetAddressOffset;
77    }
78
79    public Format getFormat() {
80        return Format.Format10t;
81    }
82
83    public int getTargetAddressOffset() {
84        return targetAddressOffset;
85    }
86
87    private static class Factory implements InstructionFactory {
88        public Instruction makeInstruction(DexFile dexFile, Opcode opcode, byte[] buffer, int bufferIndex) {
89            return new Instruction10t(opcode, buffer, bufferIndex);
90        }
91    }
92}
93