jdk8-mips64-public/hotspot: src/share/vm/classfile/altHashing.hpp@eb7ce841ccec

     1 /*

     2  * Copyright (c) 2012, 2014, 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  */

    25 #ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP

    26 #define SHARE_VM_CLASSFILE_ALTHASHING_HPP

    28 #include "prims/jni.h"

    29 #include "memory/allocation.hpp"

    31 /**

    32  * Implementation of alternate more secure hashing.

    33  */

    35 class AltHashing : AllStatic {

    37   // For the seed computation

    38   static uint64_t halfsiphash_64(const uint32_t* data, int len);

    39   static uint64_t halfsiphash_64(uint64_t seed, const uint32_t* data, int len);

    40  #ifndef PRODUCT

    41    // Hashing functions used for internal testing

    42   static void testHalfsiphash_32_ByteArray();

    43   static void testHalfsiphash_32_CharArray();

    44   static void testHalfsiphash_64_FromReference();

    45  #endif // PRODUCT

    46  public:

    47   static uint64_t compute_seed();

    49   // For Symbols

    50   static uint32_t halfsiphash_32(uint64_t seed, const uint8_t* data, int len);

    51   // For Strings

    52   static uint32_t halfsiphash_32(uint64_t seed, const uint16_t* data, int len);

    53   NOT_PRODUCT(static void test_alt_hash();)

    54 };

    55 #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP

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