1 | /* |
2 | * Copyright (c) 2012, 2019, 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 | */ |
24 | |
25 | #ifndef SHARE_CLASSFILE_ALTHASHING_HPP |
26 | #define SHARE_CLASSFILE_ALTHASHING_HPP |
27 | |
28 | #include "jni.h" |
29 | #include "classfile/symbolTable.hpp" |
30 | |
31 | /** |
32 | * Hashing utilities. |
33 | * |
34 | * Implementation of Murmur3 hashing. |
35 | * This code was translated from src/share/classes/sun/misc/Hashing.java |
36 | * code in the JDK. |
37 | */ |
38 | |
39 | class AltHashing : AllStatic { |
40 | friend class AltHashingTest; |
41 | |
42 | // utility function copied from java/lang/Integer |
43 | static juint Integer_rotateLeft(juint i, int distance) { |
44 | return (i << distance) | (i >> (32 - distance)); |
45 | } |
46 | static juint murmur3_32(const jint* data, int len); |
47 | static juint murmur3_32(juint seed, const jint* data, int len); |
48 | |
49 | public: |
50 | static juint compute_seed(); |
51 | static juint murmur3_32(juint seed, const jbyte* data, int len); |
52 | static juint murmur3_32(juint seed, const jchar* data, int len); |
53 | }; |
54 | #endif // SHARE_CLASSFILE_ALTHASHING_HPP |
55 | |