author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 46746 | hotspot/src/share/vm/utilities/hashtable.cpp@ea379ebb9447 |
child 47634 | 6a0c42c40cd1 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2003, 2017, 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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#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 "memory/allocation.inline.hpp" |
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#include "memory/filemap.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/oop.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, MAX2((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_intptr(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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_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 allocator in blocks is preferable but doesn't have free semantics. |
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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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// Check to see if the hashtable is unbalanced. The caller set a flag to |
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// rehash at the next safepoint. If this bucket is 60 times greater than the |
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// expected average bucket length, it's an unbalanced hashtable. |
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// This is somewhat an arbitrary heuristic but if one bucket gets to |
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// rehash_count which is currently 100, there's probably something wrong. |
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template <class T, MEMFLAGS F> bool RehashableHashtable<T, F>::check_rehash_table(int count) { |
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assert(this->table_size() != 0, "underflow"); |
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if (count > (((double)this->number_of_entries()/(double)this->table_size())*rehash_multiple)) { |
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// Set a flag for the next safepoint, which should be at some guaranteed |
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// safepoint interval. |
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return true; |
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} |
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return false; |
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} |
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// Create a new table and using alternate hash code, populate the new table |
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// with the existing elements. This can be used to change the hash code |
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// and could in the future change the size of the table. |
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template <class T, MEMFLAGS F> void RehashableHashtable<T, F>::move_to(RehashableHashtable<T, F>* new_table) { |
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// Initialize the global seed for hashing. |
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_seed = AltHashing::compute_seed(); |
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assert(seed() != 0, "shouldn't be zero"); |
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int saved_entry_count = this->number_of_entries(); |
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// Iterate through the table and create a new entry for the new table |
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for (int i = 0; i < new_table->table_size(); ++i) { |
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for (HashtableEntry<T, F>* p = this->bucket(i); p != NULL; ) { |
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HashtableEntry<T, F>* next = p->next(); |
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T string = p->literal(); |
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// Use alternate hashing algorithm on the symbol in the first table |
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unsigned int hashValue = string->new_hash(seed()); |
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// Get a new index relative to the new table (can also change size) |
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int index = new_table->hash_to_index(hashValue); |
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p->set_hash(hashValue); |
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// Keep the shared bit in the Hashtable entry to indicate that this entry |
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// can't be deleted. The shared bit is the LSB in the _next field so |
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// walking the hashtable past these entries requires |
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// BasicHashtableEntry::make_ptr() call. |
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bool keep_shared = p->is_shared(); |
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this->unlink_entry(p); |
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new_table->add_entry(index, 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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// give the new table the free list as well |
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new_table->copy_freelist(this); |
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assert(new_table->number_of_entries() == saved_entry_count, "lost entry on dictionary copy?"); |
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// Destroy memory used by the buckets in the hashtable. The memory |
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// for the elements has been used in a new table and is not |
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// destroyed. The memory reuse will benefit resizing the SystemDictionary |
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// to avoid a memory allocation spike at safepoint. |
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BasicHashtable<F>::free_buckets(); |
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} |
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template <MEMFLAGS F> void BasicHashtable<F>::free_buckets() { |
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if (NULL != _buckets) { |
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// Don't delete the buckets in the shared space. They aren't |
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// allocated by os::malloc |
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if (!UseSharedSpaces || |
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!FileMapInfo::current_info()->is_in_shared_space(_buckets)) { |
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FREE_C_HEAP_ARRAY(HashtableBucket, _buckets); |
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} |
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_buckets = NULL; |
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} |
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} |
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template <MEMFLAGS F> void BasicHashtable<F>::BucketUnlinkContext::free_entry(BasicHashtableEntry<F>* entry) { |
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entry->set_next(_removed_head); |
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_removed_head = entry; |
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if (_removed_tail == NULL) { |
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_removed_tail = entry; |
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} |
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_num_removed++; |
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} |
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template <MEMFLAGS F> void BasicHashtable<F>::bulk_free_entries(BucketUnlinkContext* context) { |
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if (context->_num_removed == 0) { |
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assert(context->_removed_head == NULL && context->_removed_tail == NULL, |
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"Zero entries in the unlink context, but elements linked from " PTR_FORMAT " to " PTR_FORMAT, |
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p2i(context->_removed_head), p2i(context->_removed_tail)); |
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return; |
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} |
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// MT-safe add of the list of BasicHashTableEntrys from the context to the free list. |
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BasicHashtableEntry<F>* current = _free_list; |
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while (true) { |
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192 |
context->_removed_tail->set_next(current); |
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BasicHashtableEntry<F>* old = (BasicHashtableEntry<F>*)Atomic::cmpxchg_ptr(context->_removed_head, &_free_list, current); |
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194 |
if (old == current) { |
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195 |
break; |
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196 |
} |
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197 |
current = old; |
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198 |
} |
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199 |
Atomic::add(-context->_num_removed, &_number_of_entries); |
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200 |
} |
1 | 201 |
// Copy the table to the shared space. |
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template <MEMFLAGS F> size_t BasicHashtable<F>::count_bytes_for_table() { |
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size_t bytes = 0; |
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bytes += sizeof(intptr_t); // len |
1 | 205 |
|
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for (int i = 0; i < _table_size; ++i) { |
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for (BasicHashtableEntry<F>** p = _buckets[i].entry_addr(); |
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*p != NULL; |
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p = (*p)->next_addr()) { |
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210 |
bytes += entry_size(); |
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211 |
} |
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212 |
} |
1 | 213 |
|
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return bytes; |
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215 |
} |
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216 |
|
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// Dump the hash table entries (into CDS archive) |
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template <MEMFLAGS F> void BasicHashtable<F>::copy_table(char* top, char* end) { |
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assert(is_aligned(top, sizeof(intptr_t)), "bad alignment"); |
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intptr_t *plen = (intptr_t*)(top); |
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top += sizeof(*plen); |
1 | 222 |
|
223 |
int i; |
|
224 |
for (i = 0; i < _table_size; ++i) { |
|
13195 | 225 |
for (BasicHashtableEntry<F>** p = _buckets[i].entry_addr(); |
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*p != NULL; |
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p = (*p)->next_addr()) { |
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*p = (BasicHashtableEntry<F>*)memcpy(top, (void*)*p, entry_size()); |
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top += entry_size(); |
1 | 230 |
} |
231 |
} |
|
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*plen = (char*)(top) - (char*)plen - sizeof(*plen); |
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233 |
assert(top == end, "count_bytes_for_table is wrong"); |
1 | 234 |
// Set the shared bit. |
235 |
||
236 |
for (i = 0; i < _table_size; ++i) { |
|
13195 | 237 |
for (BasicHashtableEntry<F>* p = bucket(i); p != NULL; p = p->next()) { |
1 | 238 |
p->set_shared(); |
239 |
} |
|
240 |
} |
|
241 |
} |
|
242 |
||
46742 | 243 |
// For oops and Strings the size of the literal is interesting. For other types, nobody cares. |
244 |
static int literal_size(ConstantPool*) { return 0; } |
|
245 |
static int literal_size(Klass*) { return 0; } |
|
246 |
#if INCLUDE_ALL_GCS |
|
247 |
static int literal_size(nmethod*) { return 0; } |
|
248 |
#endif |
|
249 |
||
250 |
static int literal_size(Symbol *symbol) { |
|
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return symbol->size() * HeapWordSize; |
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252 |
} |
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253 |
|
46742 | 254 |
static int literal_size(oop obj) { |
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255 |
// 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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257 |
// the String.value array is not shared anymore. |
46742 | 258 |
if (obj == NULL) { |
259 |
return 0; |
|
260 |
} else if (obj->klass() == SystemDictionary::String_klass()) { |
|
261 |
return (obj->size() + java_lang_String::value(obj)->size()) * HeapWordSize; |
|
262 |
} else { |
|
263 |
return obj->size(); |
|
264 |
} |
|
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265 |
} |
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266 |
|
46742 | 267 |
|
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268 |
// Dump footprint and bucket length statistics |
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269 |
// |
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270 |
// Note: if you create a new subclass of Hashtable<MyNewType, F>, you will need to |
46742 | 271 |
// add a new function static int literal_size(MyNewType lit) |
272 |
// because I can't get template <class T> int literal_size(T) to pick the specializations for Symbol and oop. |
|
273 |
// |
|
274 |
// The StringTable and SymbolTable dumping print how much footprint is used by the String and Symbol |
|
275 |
// literals. |
|
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276 |
|
46742 | 277 |
template <class T, MEMFLAGS F> void Hashtable<T, F>::print_table_statistics(outputStream* st, |
278 |
const char *table_name) { |
|
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279 |
NumberSeq summary; |
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280 |
int literal_bytes = 0; |
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281 |
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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literal_bytes += literal_size(e->literal()); |
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287 |
} |
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288 |
summary.add((double)count); |
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289 |
} |
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290 |
double num_buckets = summary.num(); |
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291 |
double num_entries = summary.sum(); |
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292 |
|
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int bucket_bytes = (int)num_buckets * sizeof(HashtableBucket<F>); |
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int entry_bytes = (int)num_entries * sizeof(HashtableEntry<T, F>); |
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int total_bytes = literal_bytes + bucket_bytes + entry_bytes; |
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296 |
|
46742 | 297 |
int bucket_size = (num_buckets <= 0) ? 0 : (bucket_bytes / num_buckets); |
298 |
int entry_size = (num_entries <= 0) ? 0 : (entry_bytes / num_entries); |
|
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299 |
|
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300 |
st->print_cr("%s statistics:", table_name); |
46742 | 301 |
st->print_cr("Number of buckets : %9d = %9d bytes, each %d", (int)num_buckets, bucket_bytes, bucket_size); |
302 |
st->print_cr("Number of entries : %9d = %9d bytes, each %d", (int)num_entries, entry_bytes, entry_size); |
|
303 |
if (literal_bytes != 0) { |
|
304 |
double literal_avg = (num_entries <= 0) ? 0 : (literal_bytes / num_entries); |
|
305 |
st->print_cr("Number of literals : %9d = %9d bytes, avg %7.3f", (int)num_entries, literal_bytes, literal_avg); |
|
306 |
} |
|
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307 |
st->print_cr("Total footprint : %9s = %9d bytes", "", total_bytes); |
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308 |
st->print_cr("Average bucket size : %9.3f", summary.avg()); |
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309 |
st->print_cr("Variance of bucket size : %9.3f", summary.variance()); |
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310 |
st->print_cr("Std. dev. of bucket size: %9.3f", summary.sd()); |
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311 |
st->print_cr("Maximum bucket size : %9d", (int)summary.maximum()); |
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312 |
} |
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313 |
|
1 | 314 |
|
315 |
// Dump the hash table buckets. |
|
316 |
||
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317 |
template <MEMFLAGS F> size_t BasicHashtable<F>::count_bytes_for_buckets() { |
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318 |
size_t bytes = 0; |
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319 |
bytes += sizeof(intptr_t); // len |
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320 |
bytes += sizeof(intptr_t); // _number_of_entries |
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321 |
bytes += _table_size * sizeof(HashtableBucket<F>); // the buckets |
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322 |
|
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323 |
return bytes; |
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324 |
} |
1 | 325 |
|
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326 |
// Dump the buckets (into CDS archive) |
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327 |
template <MEMFLAGS F> void BasicHashtable<F>::copy_buckets(char* top, char* end) { |
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328 |
assert(is_aligned(top, sizeof(intptr_t)), "bad alignment"); |
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329 |
intptr_t len = _table_size * sizeof(HashtableBucket<F>); |
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330 |
*(intptr_t*)(top) = len; |
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331 |
top += sizeof(intptr_t); |
1 | 332 |
|
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333 |
*(intptr_t*)(top) = _number_of_entries; |
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334 |
top += sizeof(intptr_t); |
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335 |
|
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336 |
_buckets = (HashtableBucket<F>*)memcpy(top, (void*)_buckets, len); |
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337 |
top += len; |
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|
338 |
|
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339 |
assert(top == end, "count_bytes_for_buckets is wrong"); |
1 | 340 |
} |
341 |
||
342 |
#ifndef PRODUCT |
|
343 |
||
13195 | 344 |
template <class T, MEMFLAGS F> void Hashtable<T, F>::print() { |
1 | 345 |
ResourceMark rm; |
346 |
||
13195 | 347 |
for (int i = 0; i < BasicHashtable<F>::table_size(); i++) { |
348 |
HashtableEntry<T, F>* entry = bucket(i); |
|
1 | 349 |
while(entry != NULL) { |
350 |
tty->print("%d : ", i); |
|
351 |
entry->literal()->print(); |
|
352 |
tty->cr(); |
|
353 |
entry = entry->next(); |
|
354 |
} |
|
355 |
} |
|
356 |
} |
|
357 |
||
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358 |
template <MEMFLAGS F> |
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359 |
template <class T> void BasicHashtable<F>::verify_table(const char* table_name) { |
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360 |
int element_count = 0; |
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361 |
int max_bucket_count = 0; |
46545 | 362 |
int max_bucket_number = 0; |
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363 |
for (int index = 0; index < table_size(); index++) { |
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364 |
int bucket_count = 0; |
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|
365 |
for (T* probe = (T*)bucket(index); probe != NULL; probe = probe->next()) { |
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366 |
probe->verify(); |
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367 |
bucket_count++; |
1 | 368 |
} |
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|
369 |
element_count += bucket_count; |
46545 | 370 |
if (bucket_count > max_bucket_count) { |
371 |
max_bucket_count = bucket_count; |
|
372 |
max_bucket_number = index; |
|
373 |
} |
|
1 | 374 |
} |
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guarantee(number_of_entries() == element_count, |
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376 |
"Verify of %s failed", table_name); |
46545 | 377 |
|
378 |
// Log some statistics about the hashtable |
|
379 |
log_info(hashtables)("%s max bucket size %d bucket %d element count %d table size %d", table_name, |
|
380 |
max_bucket_count, max_bucket_number, _number_of_entries, _table_size); |
|
381 |
if (_number_of_entries > 0 && log_is_enabled(Debug, hashtables)) { |
|
382 |
for (int index = 0; index < table_size(); index++) { |
|
383 |
int bucket_count = 0; |
|
384 |
for (T* probe = (T*)bucket(index); probe != NULL; probe = probe->next()) { |
|
385 |
log_debug(hashtables)("bucket %d hash " INTPTR_FORMAT, index, (intptr_t)probe->hash()); |
|
386 |
bucket_count++; |
|
387 |
} |
|
388 |
if (bucket_count > 0) { |
|
389 |
log_debug(hashtables)("bucket %d count %d", index, bucket_count); |
|
390 |
} |
|
391 |
} |
|
392 |
} |
|
1 | 393 |
} |
394 |
#endif // PRODUCT |
|
395 |
||
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// Explicitly instantiate these types |
26422 | 397 |
#if INCLUDE_ALL_GCS |
398 |
template class Hashtable<nmethod*, mtGC>; |
|
399 |
template class HashtableEntry<nmethod*, mtGC>; |
|
400 |
template class BasicHashtable<mtGC>; |
|
401 |
#endif |
|
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template class Hashtable<ConstantPool*, mtClass>; |
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403 |
template class RehashableHashtable<Symbol*, mtSymbol>; |
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template class RehashableHashtable<oopDesc*, mtSymbol>; |
13195 | 405 |
template class Hashtable<Symbol*, mtSymbol>; |
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406 |
template class Hashtable<Klass*, mtClass>; |
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407 |
template class Hashtable<InstanceKlass*, mtClass>; |
13195 | 408 |
template class Hashtable<oop, mtClass>; |
46729 | 409 |
template class Hashtable<Symbol*, mtModule>; |
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410 |
#if defined(SOLARIS) || defined(CHECK_UNHANDLED_OOPS) |
13195 | 411 |
template class Hashtable<oop, mtSymbol>; |
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412 |
template class RehashableHashtable<oop, mtSymbol>; |
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|
413 |
#endif // SOLARIS || CHECK_UNHANDLED_OOPS |
13195 | 414 |
template class Hashtable<oopDesc*, mtSymbol>; |
415 |
template class Hashtable<Symbol*, mtClass>; |
|
416 |
template class HashtableEntry<Symbol*, mtSymbol>; |
|
417 |
template class HashtableEntry<Symbol*, mtClass>; |
|
418 |
template class HashtableEntry<oop, mtSymbol>; |
|
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|
419 |
template class HashtableBucket<mtClass>; |
13195 | 420 |
template class BasicHashtableEntry<mtSymbol>; |
421 |
template class BasicHashtableEntry<mtCode>; |
|
422 |
template class BasicHashtable<mtClass>; |
|
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|
423 |
template class BasicHashtable<mtClassShared>; |
13195 | 424 |
template class BasicHashtable<mtSymbol>; |
425 |
template class BasicHashtable<mtCode>; |
|
426 |
template class BasicHashtable<mtInternal>; |
|
38733 | 427 |
template class BasicHashtable<mtModule>; |
36384 | 428 |
#if INCLUDE_TRACE |
429 |
template class Hashtable<Symbol*, mtTracing>; |
|
430 |
template class HashtableEntry<Symbol*, mtTracing>; |
|
431 |
template class BasicHashtable<mtTracing>; |
|
432 |
#endif |
|
30593 | 433 |
template class BasicHashtable<mtCompiler>; |
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|
434 |
|
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|
435 |
template void BasicHashtable<mtClass>::verify_table<DictionaryEntry>(char const*); |
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436 |
template void BasicHashtable<mtModule>::verify_table<ModuleEntry>(char const*); |
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437 |
template void BasicHashtable<mtModule>::verify_table<PackageEntry>(char const*); |
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|
438 |
template void BasicHashtable<mtClass>::verify_table<ProtectionDomainCacheEntry>(char const*); |
46545 | 439 |
template void BasicHashtable<mtClass>::verify_table<PlaceholderEntry>(char const*); |