Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/classfile/altHashing.hpp@2c6ef90f030a (annotated)
src/share/vm/classfile/altHashing.hpp
Mon, 07 Jul 2014 10:12:40 +0200
- author
- stefank
- date
- Mon, 07 Jul 2014 10:12:40 +0200
- changeset 6992
- 2c6ef90f030a
- parent 6351
- f9e35a9dc8c7
- child 6876
- 710a3c8b516e
- child 10008
- fd3484fadbe3
- permissions
- -rw-r--r--
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
| coleenp@3865 | 1 | /* |
| minqi@6351 | 2 | * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. |
| coleenp@3865 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| coleenp@3865 | 4 | * |
| coleenp@3865 | 5 | * This code is free software; you can redistribute it and/or modify it |
| coleenp@3865 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| coleenp@3865 | 7 | * published by the Free Software Foundation. |
| coleenp@3865 | 8 | * |
| coleenp@3865 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| coleenp@3865 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| coleenp@3865 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| coleenp@3865 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| coleenp@3865 | 13 | * accompanied this code). |
| coleenp@3865 | 14 | * |
| coleenp@3865 | 15 | * You should have received a copy of the GNU General Public License version |
| coleenp@3865 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| coleenp@3865 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| coleenp@3865 | 18 | * |
| coleenp@3865 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| coleenp@3865 | 20 | * or visit www.oracle.com if you need additional information or have any |
| coleenp@3865 | 21 | * questions. |
| coleenp@3865 | 22 | * |
| coleenp@3865 | 23 | */ |
| coleenp@3865 | 24 | |
| coleenp@3865 | 25 | #ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP |
| coleenp@3865 | 26 | #define SHARE_VM_CLASSFILE_ALTHASHING_HPP |
| coleenp@3865 | 27 | |
| coleenp@3865 | 28 | #include "prims/jni.h" |
| coleenp@3865 | 29 | #include "classfile/symbolTable.hpp" |
| coleenp@3865 | 30 | |
| coleenp@3865 | 31 | /** |
| coleenp@3865 | 32 | * Hashing utilities. |
| coleenp@3865 | 33 | * |
| coleenp@3865 | 34 | * Implementation of Murmur3 hashing. |
| coleenp@3865 | 35 | * This code was translated from src/share/classes/sun/misc/Hashing.java |
| coleenp@3865 | 36 | * code in the JDK. |
| coleenp@3865 | 37 | */ |
| coleenp@3865 | 38 | |
| coleenp@3865 | 39 | class AltHashing : AllStatic { |
| coleenp@3865 | 40 | |
| coleenp@3865 | 41 | // utility function copied from java/lang/Integer |
| minqi@6351 | 42 | static juint Integer_rotateLeft(juint i, int distance) { |
| minqi@6351 | 43 | return (i << distance) | (i >> (32-distance)); |
| coleenp@3865 | 44 | } |
| minqi@6351 | 45 | static juint murmur3_32(const int* data, int len); |
| minqi@6351 | 46 | static juint murmur3_32(juint seed, const int* data, int len); |
| coleenp@3865 | 47 | |
| coleenp@3865 | 48 | #ifndef PRODUCT |
| coleenp@3865 | 49 | // Hashing functions used for internal testing |
| minqi@6351 | 50 | static juint murmur3_32(const jbyte* data, int len); |
| minqi@6351 | 51 | static juint murmur3_32(const jchar* data, int len); |
| coleenp@3865 | 52 | static void testMurmur3_32_ByteArray(); |
| coleenp@3865 | 53 | static void testEquivalentHashes(); |
| coleenp@3865 | 54 | #endif // PRODUCT |
| coleenp@3865 | 55 | |
| coleenp@3865 | 56 | public: |
| minqi@6351 | 57 | static juint compute_seed(); |
| minqi@6351 | 58 | static juint murmur3_32(juint seed, const jbyte* data, int len); |
| minqi@6351 | 59 | static juint murmur3_32(juint seed, const jchar* data, int len); |
| coleenp@3865 | 60 | NOT_PRODUCT(static void test_alt_hash();) |
| coleenp@3865 | 61 | }; |
| coleenp@3865 | 62 | #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP |
