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comparison graal/com.oracle.max.cri/src/com/sun/cri/bytecode/BytecodeTableSwitch.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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3732:3e2e8b8abdaf 3733:e233f5660da4
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.sun.cri.bytecode;
24
25 /**
26 * A utility for processing {@link Bytecodes#TABLESWITCH} bytecodes.
27 */
28 public class BytecodeTableSwitch extends BytecodeSwitch {
29 private static final int OFFSET_TO_LOW_KEY = 4;
30 private static final int OFFSET_TO_HIGH_KEY = 8;
31 private static final int OFFSET_TO_FIRST_JUMP_OFFSET = 12;
32 private static final int JUMP_OFFSET_SIZE = 4;
33
34 /**
35 * Constructor for a {@link BytecodeStream}.
36 * @param stream the {@code BytecodeStream} containing the switch instruction
37 * @param bci the index in the stream of the switch instruction
38 */
39 public BytecodeTableSwitch(BytecodeStream stream, int bci) {
40 super(stream, bci);
41 }
42
43 /**
44 * Constructor for a bytecode array.
45 * @param code the bytecode array containing the switch instruction.
46 * @param bci the index in the array of the switch instruction
47 */
48 public BytecodeTableSwitch(byte[] code, int bci) {
49 super(code, bci);
50 }
51
52 /**
53 * Gets the low key of the table switch.
54 * @return the low key
55 */
56 public int lowKey() {
57 return readWord(alignedBci + OFFSET_TO_LOW_KEY);
58 }
59
60 /**
61 * Gets the high key of the table switch.
62 * @return the high key
63 */
64 public int highKey() {
65 return readWord(alignedBci + OFFSET_TO_HIGH_KEY);
66 }
67
68 @Override
69 public int keyAt(int i) {
70 return lowKey() + i;
71 }
72
73 @Override
74 public int defaultOffset() {
75 return readWord(alignedBci);
76 }
77
78 @Override
79 public int offsetAt(int i) {
80 return readWord(alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * i);
81 }
82
83 @Override
84 public int numberOfCases() {
85 return highKey() - lowKey() + 1;
86 }
87
88 @Override
89 public int size() {
90 return alignedBci + OFFSET_TO_FIRST_JUMP_OFFSET + JUMP_OFFSET_SIZE * numberOfCases() - bci;
91 }
92 }