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comparison src/share/vm/classfile/altHashing.hpp @ 6162:e9140bf80b4a

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7158800: Improve storage of symbol tables Summary: Use an alternate version of hashing algorithm for symbol string tables and after a certain bucket size to improve performance Reviewed-by: pbk, kamg, dlong, kvn, fparain
author coleenp
date Wed, 13 Jun 2012 19:52:59 -0400
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children cd6b3f1a94ff
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6129:4d399f013e5a 6162:e9140bf80b4a
1 /*
2 * Copyright (c) 2012, 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_VM_CLASSFILE_ALTHASHING_HPP
26 #define SHARE_VM_CLASSFILE_ALTHASHING_HPP
27
28 #include "prims/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
41 // utility function copied from java/lang/Integer
42 static jint Integer_rotateLeft(jint i, int distance) {
43 return (i << distance) | (((juint)i) >> (32-distance));
44 }
45 static jint murmur3_32(const int* data, int len);
46 static jint murmur3_32(jint seed, const int* data, int len);
47
48 #ifndef PRODUCT
49 // Hashing functions used for internal testing
50 static jint murmur3_32(const jbyte* data, int len);
51 static jint murmur3_32(const jchar* data, int len);
52 static void testMurmur3_32_ByteArray();
53 static void testEquivalentHashes();
54 #endif // PRODUCT
55
56 public:
57 static jint compute_seed();
58 static jint murmur3_32(jint seed, const jbyte* data, int len);
59 static jint murmur3_32(jint seed, const jchar* data, int len);
60 NOT_PRODUCT(static void test_alt_hash();)
61 };
62 #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP