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annotate src/share/vm/classfile/altHashing.hpp @ 18041:52b4284cb496

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Merge with jdk8u20-b26
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 16:02:50 +0200
parents 4ca6dc0799b6
children
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1 /*
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP
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26 #define SHARE_VM_CLASSFILE_ALTHASHING_HPP
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27
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28 #include "prims/jni.h"
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29 #include "classfile/symbolTable.hpp"
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30
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31 /**
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32 * Hashing utilities.
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33 *
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34 * Implementation of Murmur3 hashing.
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35 * This code was translated from src/share/classes/sun/misc/Hashing.java
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36 * code in the JDK.
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37 */
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38
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39 class AltHashing : AllStatic {
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40
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41 // utility function copied from java/lang/Integer
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42 static juint Integer_rotateLeft(juint i, int distance) {
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43 return (i << distance) | (i >> (32-distance));
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44 }
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45 static juint murmur3_32(const int* data, int len);
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46 static juint murmur3_32(juint seed, const int* data, int len);
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47
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48 #ifndef PRODUCT
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49 // Hashing functions used for internal testing
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50 static juint murmur3_32(const jbyte* data, int len);
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51 static juint murmur3_32(const jchar* data, int len);
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52 static void testMurmur3_32_ByteArray();
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53 static void testEquivalentHashes();
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54 #endif // PRODUCT
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55
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56 public:
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57 static juint compute_seed();
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58 static juint murmur3_32(juint seed, const jbyte* data, int len);
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59 static juint murmur3_32(juint seed, const jchar* data, int len);
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60 NOT_PRODUCT(static void test_alt_hash();)
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61 };
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62 #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP