Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/classfile/altHashing.hpp
src/share/vm/classfile/altHashing.hpp
- changeset 10015
- eb7ce841ccec
- parent 6876
- 710a3c8b516e
- parent 10009
- 8adf45218add
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| 9934:2251ba078bec | 10015:eb7ce841ccec |
|---|---|
| 24 | 24 |
| 25 #ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP | 25 #ifndef SHARE_VM_CLASSFILE_ALTHASHING_HPP |
| 26 #define SHARE_VM_CLASSFILE_ALTHASHING_HPP | 26 #define SHARE_VM_CLASSFILE_ALTHASHING_HPP |
| 27 | 27 |
| 28 #include "prims/jni.h" | 28 #include "prims/jni.h" |
| 29 #include "classfile/symbolTable.hpp" | 29 #include "memory/allocation.hpp" |
| 30 | 30 |
| 31 /** | 31 /** |
| 32 * Hashing utilities. | 32 * Implementation of alternate more secure hashing. |
| 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 */ | 33 */ |
| 38 | 34 |
| 39 class AltHashing : AllStatic { | 35 class AltHashing : AllStatic { |
| 40 | 36 |
| 41 // utility function copied from java/lang/Integer | 37 // For the seed computation |
| 42 static juint Integer_rotateLeft(juint i, int distance) { | 38 static uint64_t halfsiphash_64(const uint32_t* data, int len); |
| 43 return (i << distance) | (i >> (32-distance)); | 39 static uint64_t halfsiphash_64(uint64_t seed, const uint32_t* data, int len); |
| 44 } | 40 #ifndef PRODUCT |
| 45 static juint murmur3_32(const int* data, int len); | 41 // Hashing functions used for internal testing |
| 46 static juint murmur3_32(juint seed, const int* data, int len); | 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(); | |
| 47 | 48 |
| 48 #ifndef PRODUCT | 49 // For Symbols |
| 49 // Hashing functions used for internal testing | 50 static uint32_t halfsiphash_32(uint64_t seed, const uint8_t* data, int len); |
| 50 static juint murmur3_32(const jbyte* data, int len); | 51 // For Strings |
| 51 static juint murmur3_32(const jchar* data, int len); | 52 static uint32_t halfsiphash_32(uint64_t seed, const uint16_t* data, int len); |
| 52 static void testMurmur3_32_ByteArray(); | |
| 53 static void testEquivalentHashes(); | |
| 54 #endif // PRODUCT | |
| 55 | |
| 56 public: | |
| 57 static juint compute_seed(); | |
| 58 static juint murmur3_32(juint seed, const jbyte* data, int len); | |
| 59 static juint murmur3_32(juint seed, const jchar* data, int len); | |
| 60 NOT_PRODUCT(static void test_alt_hash();) | 53 NOT_PRODUCT(static void test_alt_hash();) |
| 61 }; | 54 }; |
| 62 #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP | 55 #endif // SHARE_VM_CLASSFILE_ALTHASHING_HPP |
