SwitchInstruction.java revision cfead78069f3dc32998dc118ee08cab3867acea2 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2011 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.classfile.instruction;
22
23/**
24 * This Instruction represents a simple instruction without variable arguments
25 * or constant pool references.
26 *
27 * @author Eric Lafortune
28 */
29public abstract class SwitchInstruction extends Instruction
30{
31    public int   defaultOffset;
32    public int[] jumpOffsets;
33
34
35    /**
36     * Creates an uninitialized SwitchInstruction.
37     */
38    public SwitchInstruction() {}
39
40
41    /**
42     * Creates a new SwitchInstruction with the given arguments.
43     */
44    public SwitchInstruction(byte  opcode,
45                             int   defaultOffset,
46                             int[] jumpOffsets)
47    {
48        this.opcode        = opcode;
49        this.defaultOffset = defaultOffset;
50        this.jumpOffsets   = jumpOffsets;
51    }
52
53
54    /**
55     * Copies the given instruction into this instruction.
56     * @param switchInstruction the instruction to be copied.
57     * @return this instruction.
58     */
59    public SwitchInstruction copy(SwitchInstruction switchInstruction)
60    {
61        this.opcode        = switchInstruction.opcode;
62        this.defaultOffset = switchInstruction.defaultOffset;
63        this.jumpOffsets   = switchInstruction.jumpOffsets;
64
65        return this;
66    }
67
68
69    // Implementations for Instruction.
70
71    public String toString(int offset)
72    {
73        return "["+offset+"] "+toString()+" (target="+(offset+defaultOffset)+")";
74    }
75
76
77    // Implementations for Object.
78
79    public String toString()
80    {
81        return getName()+" ("+jumpOffsets.length+" offsets, default="+defaultOffset+")";
82    }
83}
84