1 /* 2 * Copyright (c) 2003, 2019, 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_UTILITIES_HASHTABLE_INLINE_HPP 26 #define SHARE_UTILITIES_HASHTABLE_INLINE_HPP 27 28 #include "memory/allocation.inline.hpp" 29 #include "runtime/orderAccess.hpp" 30 #include "utilities/hashtable.hpp" 31 #include "utilities/dtrace.hpp" 32 33 // Inline function definitions for hashtable.hpp. 34 35 // -------------------------------------------------------------------------- 36 37 // Initialize a table. 38 39 template <MEMFLAGS F> inline BasicHashtable<F>::BasicHashtable(int table_size, int entry_size) { 40 // Called on startup, no locking needed 41 initialize(table_size, entry_size, 0); 42 _buckets = NEW_C_HEAP_ARRAY2(HashtableBucket<F>, table_size, F, CURRENT_PC); 43 for (int index = 0; index < _table_size; index++) { 44 _buckets[index].clear(); 45 } 46 _stats_rate = TableRateStatistics(); 47 } 48 49 50 template <MEMFLAGS F> inline BasicHashtable<F>::BasicHashtable(int table_size, int entry_size, 51 HashtableBucket<F>* buckets, 52 int number_of_entries) { 53 // Called on startup, no locking needed 54 initialize(table_size, entry_size, number_of_entries); 55 _buckets = buckets; 56 _stats_rate = TableRateStatistics(); 57 } 58 59 template <MEMFLAGS F> inline BasicHashtable<F>::~BasicHashtable() { 60 for (int i = 0; i < _entry_blocks->length(); i++) { 61 FREE_C_HEAP_ARRAY(char, _entry_blocks->at(i)); 62 } 63 delete _entry_blocks; 64 free_buckets(); 65 } 66 67 template <MEMFLAGS F> inline void BasicHashtable<F>::initialize(int table_size, int entry_size, 68 int number_of_entries) { 69 // Called on startup, no locking needed 70 _table_size = table_size; 71 _entry_size = entry_size; 72 _free_list = NULL; 73 _first_free_entry = NULL; 74 _end_block = NULL; 75 _number_of_entries = number_of_entries; 76 _entry_blocks = new(ResourceObj::C_HEAP, F) GrowableArray<char*>(4, true, F); 77 } 78 79 80 // The following method is MT-safe and may be used with caution. 81 template <MEMFLAGS F> inline BasicHashtableEntry<F>* BasicHashtable<F>::bucket(int i) const { 82 return _buckets[i].get_entry(); 83 } 84 85 86 template <MEMFLAGS F> inline void HashtableBucket<F>::set_entry(BasicHashtableEntry<F>* l) { 87 // Warning: Preserve store ordering. The PackageEntryTable, ModuleEntryTable and 88 // SystemDictionary are read without locks. The new entry must be 89 // complete before other threads can be allowed to see it 90 // via a store to _buckets[index]. 91 OrderAccess::release_store(&_entry, l); 92 } 93 94 95 template <MEMFLAGS F> inline BasicHashtableEntry<F>* HashtableBucket<F>::get_entry() const { 96 // Warning: Preserve load ordering. The PackageEntryTable, ModuleEntryTable and 97 // SystemDictionary are read without locks. The new entry must be 98 // complete before other threads can be allowed to see it 99 // via a store to _buckets[index]. 100 return OrderAccess::load_acquire(&_entry); 101 } 102 103 104 template <MEMFLAGS F> inline void BasicHashtable<F>::set_entry(int index, BasicHashtableEntry<F>* entry) { 105 _buckets[index].set_entry(entry); 106 if (entry != NULL) { 107 _stats_rate.add(); 108 } else { 109 _stats_rate.remove(); 110 } 111 } 112 113 114 template <MEMFLAGS F> inline void BasicHashtable<F>::add_entry(int index, BasicHashtableEntry<F>* entry) { 115 entry->set_next(bucket(index)); 116 _buckets[index].set_entry(entry); 117 ++_number_of_entries; 118 _stats_rate.add(); 119 } 120 121 template <MEMFLAGS F> inline void BasicHashtable<F>::free_entry(BasicHashtableEntry<F>* entry) { 122 entry->set_next(_free_list); 123 _free_list = entry; 124 --_number_of_entries; 125 _stats_rate.remove(); 126 } 127 128 #endif // SHARE_UTILITIES_HASHTABLE_INLINE_HPP