55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
/*
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* Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP
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#define SHARE_VM_CLASSFILE_ALTHASHING_HPP
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#include "jni.h"
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#include "classfile/symbolTable.hpp"
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/**
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* Hashing utilities.
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*
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* Implementation of Murmur3 hashing.
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* This code was translated from src/share/classes/sun/misc/Hashing.java
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* code in the JDK.
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*/
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class AltHashing : AllStatic {
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friend class AltHashingTest;
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// utility function copied from java/lang/Integer
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static juint Integer_rotateLeft(juint i, int distance) {
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return (i << distance) | (i >> (32 - distance));
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}
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static juint murmur3_32(const jint* data, int len);
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static juint murmur3_32(juint seed, const jint* data, int len);
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public:
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static juint compute_seed();
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static juint murmur3_32(juint seed, const jbyte* data, int len);
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static juint murmur3_32(juint seed, const jchar* data, int len);
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};
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#endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP
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