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src/hotspot/share/classfile/altHashing.hpp

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   1 /*
   2  * Copyright (c) 2012, 2016, 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   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 int* data, int len);
  47   static juint murmur3_32(juint seed, const int* data, int len);
  48 
   1 /*
   2  * Copyright (c) 2012, 2017, 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 "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   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 int* data, int len);
  47   static juint murmur3_32(juint seed, const int* data, int len);
  48 
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