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
39class 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