author | manc |
Wed, 13 Nov 2019 16:49:14 -0800 | |
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parent 58084 | cddef3bde924 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "classfile/altHashing.hpp" |
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#include "classfile/dictionary.hpp" |
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#include "classfile/javaClasses.inline.hpp" |
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#include "classfile/moduleEntry.hpp" |
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#include "classfile/packageEntry.hpp" |
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#include "classfile/placeholders.hpp" |
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#include "classfile/protectionDomainCache.hpp" |
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#include "classfile/stringTable.hpp" |
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#include "code/nmethod.hpp" |
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#include "logging/log.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/weakHandle.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "utilities/dtrace.hpp" |
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#include "utilities/hashtable.hpp" |
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#include "utilities/hashtable.inline.hpp" |
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#include "utilities/numberSeq.hpp" |
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// This hashtable is implemented as an open hash table with a fixed number of buckets. |
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template <MEMFLAGS F> BasicHashtableEntry<F>* BasicHashtable<F>::new_entry_free_list() { |
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BasicHashtableEntry<F>* entry = NULL; |
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if (_free_list != NULL) { |
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entry = _free_list; |
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_free_list = _free_list->next(); |
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} |
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return entry; |
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} |
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// HashtableEntrys are allocated in blocks to reduce the space overhead. |
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template <MEMFLAGS F> BasicHashtableEntry<F>* BasicHashtable<F>::new_entry(unsigned int hashValue) { |
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BasicHashtableEntry<F>* entry = new_entry_free_list(); |
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if (entry == NULL) { |
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if (_first_free_entry + _entry_size >= _end_block) { |
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int block_size = MIN2(512, MAX3(2, (int)_table_size / 2, (int)_number_of_entries)); |
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int len = _entry_size * block_size; |
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len = 1 << log2_int(len); // round down to power of 2 |
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assert(len >= _entry_size, ""); |
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_first_free_entry = NEW_C_HEAP_ARRAY2(char, len, F, CURRENT_PC); |
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_entry_blocks->append(_first_free_entry); |
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_end_block = _first_free_entry + len; |
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} |
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entry = (BasicHashtableEntry<F>*)_first_free_entry; |
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_first_free_entry += _entry_size; |
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} |
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assert(_entry_size % HeapWordSize == 0, ""); |
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entry->set_hash(hashValue); |
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return entry; |
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} |
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template <class T, MEMFLAGS F> HashtableEntry<T, F>* Hashtable<T, F>::new_entry(unsigned int hashValue, T obj) { |
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HashtableEntry<T, F>* entry; |
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entry = (HashtableEntry<T, F>*)BasicHashtable<F>::new_entry(hashValue); |
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entry->set_literal(obj); |
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return entry; |
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} |
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// Version of hashtable entry allocation that allocates in the C heap directly. |
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// The block allocator in BasicHashtable has less fragmentation, but the memory is not freed until |
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// the whole table is freed. Use allocate_new_entry() if you want to individually free the memory |
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// used by each entry |
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template <class T, MEMFLAGS F> HashtableEntry<T, F>* Hashtable<T, F>::allocate_new_entry(unsigned int hashValue, T obj) { |
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HashtableEntry<T, F>* entry = (HashtableEntry<T, F>*) NEW_C_HEAP_ARRAY(char, this->entry_size(), F); |
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entry->set_hash(hashValue); |
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entry->set_literal(obj); |
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entry->set_next(NULL); |
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return entry; |
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} |
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template <MEMFLAGS F> void BasicHashtable<F>::free_buckets() { |
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FREE_C_HEAP_ARRAY(HashtableBucket, _buckets); |
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_buckets = NULL; |
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} |
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// For oops and Strings the size of the literal is interesting. For other types, nobody cares. |
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static int literal_size(ConstantPool*) { return 0; } |
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static int literal_size(Klass*) { return 0; } |
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static int literal_size(nmethod*) { return 0; } |
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static int literal_size(Symbol *symbol) { |
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return symbol->size() * HeapWordSize; |
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} |
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static int literal_size(oop obj) { |
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// NOTE: this would over-count if (pre-JDK8) java_lang_Class::has_offset_field() is true, |
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// and the String.value array is shared by several Strings. However, starting from JDK8, |
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// the String.value array is not shared anymore. |
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if (obj == NULL) { |
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return 0; |
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} else if (obj->klass() == SystemDictionary::String_klass()) { |
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return (obj->size() + java_lang_String::value(obj)->size()) * HeapWordSize; |
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} else { |
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return obj->size(); |
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} |
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} |
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static int literal_size(WeakHandle<vm_class_loader_data> v) { |
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return literal_size(v.peek()); |
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} |
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template <MEMFLAGS F> bool BasicHashtable<F>::resize(int new_size) { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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// Allocate new buckets |
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HashtableBucket<F>* buckets_new = NEW_C_HEAP_ARRAY2_RETURN_NULL(HashtableBucket<F>, new_size, F, CURRENT_PC); |
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if (buckets_new == NULL) { |
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return false; |
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} |
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// Clear the new buckets |
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for (int i = 0; i < new_size; i++) { |
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buckets_new[i].clear(); |
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} |
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int table_size_old = _table_size; |
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// hash_to_index() uses _table_size, so switch the sizes now |
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_table_size = new_size; |
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// Move entries from the old table to a new table |
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for (int index_old = 0; index_old < table_size_old; index_old++) { |
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for (BasicHashtableEntry<F>* p = _buckets[index_old].get_entry(); p != NULL; ) { |
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BasicHashtableEntry<F>* next = p->next(); |
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bool keep_shared = p->is_shared(); |
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int index_new = hash_to_index(p->hash()); |
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p->set_next(buckets_new[index_new].get_entry()); |
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buckets_new[index_new].set_entry(p); |
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if (keep_shared) { |
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p->set_shared(); |
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} |
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p = next; |
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} |
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} |
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// The old backets now can be released |
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BasicHashtable<F>::free_buckets(); |
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// Switch to the new storage |
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_buckets = buckets_new; |
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return true; |
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} |
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template <MEMFLAGS F> bool BasicHashtable<F>::maybe_grow(int max_size, int load_factor) { |
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assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
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if (table_size() >= max_size) { |
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return false; |
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} |
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if (number_of_entries() / table_size() > load_factor) { |
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resize(MIN2<int>(table_size() * 2, max_size)); |
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return true; |
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} else { |
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return false; |
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} |
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} |
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template <class T, MEMFLAGS F> TableStatistics Hashtable<T, F>::statistics_calculate(T (*literal_load_barrier)(HashtableEntry<T, F>*)) { |
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NumberSeq summary; |
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int literal_bytes = 0; |
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for (int i = 0; i < this->table_size(); ++i) { |
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int count = 0; |
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for (HashtableEntry<T, F>* e = this->bucket(i); |
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e != NULL; e = e->next()) { |
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count++; |
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T l = (literal_load_barrier != NULL) ? literal_load_barrier(e) : e->literal(); |
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literal_bytes += literal_size(l); |
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} |
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summary.add((double)count); |
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} |
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return TableStatistics(this->_stats_rate, summary, literal_bytes, sizeof(HashtableBucket<F>), sizeof(HashtableEntry<T, F>)); |
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} |
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// Dump footprint and bucket length statistics |
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// |
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// Note: if you create a new subclass of Hashtable<MyNewType, F>, you will need to |
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// add a new function static int literal_size(MyNewType lit) |
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// because I can't get template <class T> int literal_size(T) to pick the specializations for Symbol and oop. |
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template <class T, MEMFLAGS F> void Hashtable<T, F>::print_table_statistics(outputStream* st, |
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const char *table_name, |
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215 |
T (*literal_load_barrier)(HashtableEntry<T, F>*)) { |
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TableStatistics ts = statistics_calculate(literal_load_barrier); |
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ts.print(st, table_name); |
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} |
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#ifndef PRODUCT |
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template <class T> void print_literal(T l) { |
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l->print(); |
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} |
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static void print_literal(WeakHandle<vm_class_loader_data> l) { |
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l.print(); |
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} |
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|
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template <class T, MEMFLAGS F> void Hashtable<T, F>::print() { |
1 | 230 |
ResourceMark rm; |
231 |
||
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for (int i = 0; i < BasicHashtable<F>::table_size(); i++) { |
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HashtableEntry<T, F>* entry = bucket(i); |
|
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while(entry != NULL) { |
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tty->print("%d : ", i); |
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print_literal(entry->literal()); |
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tty->cr(); |
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entry = entry->next(); |
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} |
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} |
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} |
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template <MEMFLAGS F> |
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template <class T> void BasicHashtable<F>::verify_table(const char* table_name) { |
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int element_count = 0; |
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int max_bucket_count = 0; |
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int max_bucket_number = 0; |
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for (int index = 0; index < table_size(); index++) { |
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int bucket_count = 0; |
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for (T* probe = (T*)bucket(index); probe != NULL; probe = probe->next()) { |
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probe->verify(); |
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bucket_count++; |
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} |
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element_count += bucket_count; |
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if (bucket_count > max_bucket_count) { |
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max_bucket_count = bucket_count; |
|
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max_bucket_number = index; |
|
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} |
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1 | 259 |
} |
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guarantee(number_of_entries() == element_count, |
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"Verify of %s failed", table_name); |
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// Log some statistics about the hashtable |
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log_info(hashtables)("%s max bucket size %d bucket %d element count %d table size %d", table_name, |
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max_bucket_count, max_bucket_number, _number_of_entries, _table_size); |
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if (_number_of_entries > 0 && log_is_enabled(Debug, hashtables)) { |
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for (int index = 0; index < table_size(); index++) { |
|
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int bucket_count = 0; |
|
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for (T* probe = (T*)bucket(index); probe != NULL; probe = probe->next()) { |
|
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log_debug(hashtables)("bucket %d hash " INTPTR_FORMAT, index, (intptr_t)probe->hash()); |
|
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bucket_count++; |
|
272 |
} |
|
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if (bucket_count > 0) { |
|
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log_debug(hashtables)("bucket %d count %d", index, bucket_count); |
|
275 |
} |
|
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} |
|
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} |
|
1 | 278 |
} |
279 |
#endif // PRODUCT |
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// Explicitly instantiate these types |
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template class Hashtable<nmethod*, mtGC>; |
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template class HashtableEntry<nmethod*, mtGC>; |
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template class BasicHashtable<mtGC>; |
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template class Hashtable<ConstantPool*, mtClass>; |
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template class Hashtable<Symbol*, mtSymbol>; |
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template class Hashtable<Klass*, mtClass>; |
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template class Hashtable<InstanceKlass*, mtClass>; |
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template class Hashtable<WeakHandle<vm_class_loader_data>, mtClass>; |
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template class Hashtable<Symbol*, mtModule>; |
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template class Hashtable<oop, mtSymbol>; |
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template class Hashtable<Symbol*, mtClass>; |
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template class HashtableEntry<Symbol*, mtSymbol>; |
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template class HashtableEntry<Symbol*, mtClass>; |
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template class HashtableEntry<oop, mtSymbol>; |
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template class HashtableEntry<WeakHandle<vm_class_loader_data>, mtClass>; |
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template class HashtableBucket<mtClass>; |
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template class BasicHashtableEntry<mtSymbol>; |
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template class BasicHashtableEntry<mtCode>; |
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template class BasicHashtable<mtClass>; |
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template class BasicHashtable<mtClassShared>; |
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template class BasicHashtable<mtSymbol>; |
303 |
template class BasicHashtable<mtCode>; |
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template class BasicHashtable<mtInternal>; |
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template class BasicHashtable<mtModule>; |
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template class BasicHashtable<mtCompiler>; |
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template class BasicHashtable<mtTracing>; |
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|
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template void BasicHashtable<mtClass>::verify_table<DictionaryEntry>(char const*); |
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template void BasicHashtable<mtModule>::verify_table<ModuleEntry>(char const*); |
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template void BasicHashtable<mtModule>::verify_table<PackageEntry>(char const*); |
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template void BasicHashtable<mtClass>::verify_table<ProtectionDomainCacheEntry>(char const*); |
46545 | 313 |
template void BasicHashtable<mtClass>::verify_table<PlaceholderEntry>(char const*); |