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comparison graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/BytecodeTableSwitch.java @ 21713:454a99ca00a9

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fixed canonicalizeprojects issues
author Doug Simon <doug.simon@oracle.com>
date Wed, 03 Jun 2015 22:13:10 +0200
parents graal/com.oracle.jvmci.bytecode/src/com/oracle/graal/bytecode/BytecodeTableSwitch.java@1c41d00e6b2f
children
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21712:a59a0c85650a 21713:454a99ca00a9
1 /*
2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.jvmci.bytecode;
24
25 /**
26 * A utility for processing {@link Bytecodes#TABLESWITCH} bytecodes.
27 */
28 public class BytecodeTableSwitch extends BytecodeSwitch {
29
30 private static final int OFFSET_TO_LOW_KEY = 4;
31 private static final int OFFSET_TO_HIGH_KEY = 8;
32 private static final int OFFSET_TO_FIRST_JUMP_OFFSET = 12;
33 private static final int JUMP_OFFSET_SIZE = 4;
34
35 /**
36 * Constructor for a {@link BytecodeStream}.
37 *
38 * @param stream the {@code BytecodeStream} containing the switch instruction
39 * @param bci the index in the stream of the switch instruction
40 */
41 public BytecodeTableSwitch(BytecodeStream stream, int bci) {
42 super(stream, bci);
43 }
44
45 /**
46 * Gets the low key of the table switch.
47 *
48 * @return the low key
49 */
50 public int lowKey() {
51 return stream.readInt(alignedBci + OFFSET_TO_LOW_KEY);
52 }
53
54 /**
55 * Gets the high key of the table switch.
56 *
57 * @return the high key
58 */
59 public int highKey() {
60 return stream.readInt(alignedBci + OFFSET_TO_HIGH_KEY);
61 }
62
63 @Override
64 public int keyAt(int i) {
65 return lowKey() + i;
66 }
67
68 @Override
69 public int offsetAt(int i) {
70 return stream.readInt(alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * i);
71 }
72
73 @Override
74 public int numberOfCases() {
75 return highKey() - lowKey() + 1;
76 }
77
78 @Override
79 public int size() {
80 return alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * numberOfCases() - bci;
81 }
82 }