Mercurial > hg > truffle
comparison graal/com.oracle.jvmci.bytecode/src/com/oracle/jvmci/bytecode/BytecodeLookupSwitch.java @ 21713:454a99ca00a9
fixed canonicalizeprojects issues
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 03 Jun 2015 22:13:10 +0200 |
parents | graal/com.oracle.jvmci.bytecode/src/com/oracle/graal/bytecode/BytecodeLookupSwitch.java@1c41d00e6b2f |
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21712:a59a0c85650a | 21713:454a99ca00a9 |
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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#LOOKUPSWITCH} bytecodes. | |
27 */ | |
28 public class BytecodeLookupSwitch extends BytecodeSwitch { | |
29 | |
30 private static final int OFFSET_TO_NUMBER_PAIRS = 4; | |
31 private static final int OFFSET_TO_FIRST_PAIR_MATCH = 8; | |
32 private static final int OFFSET_TO_FIRST_PAIR_OFFSET = 12; | |
33 private static final int PAIR_SIZE = 8; | |
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 BytecodeLookupSwitch(BytecodeStream stream, int bci) { | |
42 super(stream, bci); | |
43 } | |
44 | |
45 @Override | |
46 public int offsetAt(int i) { | |
47 return stream.readInt(alignedBci + OFFSET_TO_FIRST_PAIR_OFFSET + PAIR_SIZE * i); | |
48 } | |
49 | |
50 @Override | |
51 public int keyAt(int i) { | |
52 return stream.readInt(alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * i); | |
53 } | |
54 | |
55 @Override | |
56 public int numberOfCases() { | |
57 return stream.readInt(alignedBci + OFFSET_TO_NUMBER_PAIRS); | |
58 } | |
59 | |
60 @Override | |
61 public int size() { | |
62 return alignedBci + OFFSET_TO_FIRST_PAIR_MATCH + PAIR_SIZE * numberOfCases() - bci; | |
63 } | |
64 } |