coleenp@3865: /*
minqi@6351:  * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
coleenp@3865:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
coleenp@3865:  *
coleenp@3865:  * This code is free software; you can redistribute it and/or modify it
coleenp@3865:  * under the terms of the GNU General Public License version 2 only, as
coleenp@3865:  * published by the Free Software Foundation.
coleenp@3865:  *
coleenp@3865:  * This code is distributed in the hope that it will be useful, but WITHOUT
coleenp@3865:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
coleenp@3865:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
coleenp@3865:  * version 2 for more details (a copy is included in the LICENSE file that
coleenp@3865:  * accompanied this code).
coleenp@3865:  *
coleenp@3865:  * You should have received a copy of the GNU General Public License version
coleenp@3865:  * 2 along with this work; if not, write to the Free Software Foundation,
coleenp@3865:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
coleenp@3865:  *
coleenp@3865:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
coleenp@3865:  * or visit www.oracle.com if you need additional information or have any
coleenp@3865:  * questions.
coleenp@3865:  *
coleenp@3865:  */
coleenp@3865: 
coleenp@3865: #ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP
coleenp@3865: #define SHARE_VM_CLASSFILE_ALTHASHING_HPP
coleenp@3865: 
coleenp@3865: #include "prims/jni.h"
coleenp@3865: #include "classfile/symbolTable.hpp"
coleenp@3865: 
coleenp@3865: /**
coleenp@3865:  * Hashing utilities.
coleenp@3865:  *
coleenp@3865:  * Implementation of Murmur3 hashing.
coleenp@3865:  * This code was translated from src/share/classes/sun/misc/Hashing.java
coleenp@3865:  * code in the JDK.
coleenp@3865:  */
coleenp@3865: 
coleenp@3865: class AltHashing : AllStatic {
coleenp@3865: 
coleenp@3865:   // utility function copied from java/lang/Integer
minqi@6351:   static juint Integer_rotateLeft(juint i, int distance) {
minqi@6351:     return (i << distance) | (i >> (32-distance));
coleenp@3865:   }
minqi@6351:   static juint murmur3_32(const int* data, int len);
minqi@6351:   static juint murmur3_32(juint seed, const int* data, int len);
coleenp@3865: 
coleenp@3865: #ifndef PRODUCT
coleenp@3865:   // Hashing functions used for internal testing
minqi@6351:   static juint murmur3_32(const jbyte* data, int len);
minqi@6351:   static juint murmur3_32(const jchar* data, int len);
coleenp@3865:   static void testMurmur3_32_ByteArray();
coleenp@3865:   static void testEquivalentHashes();
coleenp@3865: #endif // PRODUCT
coleenp@3865: 
coleenp@3865:  public:
minqi@6351:   static juint compute_seed();
minqi@6351:   static juint murmur3_32(juint seed, const jbyte* data, int len);
minqi@6351:   static juint murmur3_32(juint seed, const jchar* data, int len);
coleenp@3865:   NOT_PRODUCT(static void test_alt_hash();)
coleenp@3865: };
coleenp@3865: #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP