133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
/*
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* Copyright (c) 1997, 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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#ifndef SHARE_CLASSFILE_STRINGTABLE_HPP
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#define SHARE_CLASSFILE_STRINGTABLE_HPP
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#include "memory/allocation.hpp"
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#include "memory/padded.hpp"
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#include "oops/oop.hpp"
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#include "oops/weakHandle.hpp"
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#include "utilities/tableStatistics.hpp"
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class CompactHashtableWriter;
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class JavaThread;
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class SerializeClosure;
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class StringTable;
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class StringTableConfig;
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class StringTableCreateEntry;
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class StringTable : public CHeapObj<mtSymbol>{
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friend class VMStructs;
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friend class Symbol;
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friend class StringTableConfig;
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friend class StringTableCreateEntry;
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static volatile bool _has_work;
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static volatile size_t _uncleaned_items_count;
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// Set if one bucket is out of balance due to hash algorithm deficiency
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static volatile bool _needs_rehashing;
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static void grow(JavaThread* jt);
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static void clean_dead_entries(JavaThread* jt);
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static double get_load_factor();
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static double get_dead_factor();
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static void check_concurrent_work();
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static void trigger_concurrent_work();
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static size_t item_added();
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static void item_removed();
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static size_t add_items_to_clean(size_t ndead);
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static oop intern(Handle string_or_null_h, const jchar* name, int len, TRAPS);
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static oop do_intern(Handle string_or_null, const jchar* name, int len, uintx hash, TRAPS);
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static oop do_lookup(const jchar* name, int len, uintx hash);
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static void print_table_statistics(outputStream* st, const char* table_name);
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static bool do_rehash();
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public:
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static size_t table_size();
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static TableStatistics get_table_statistics();
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static void create_table();
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static void do_concurrent_work(JavaThread* jt);
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static bool has_work() { return _has_work; }
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// GC support
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// Must be called before a parallel walk where strings might die.
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static void reset_dead_counter() { _uncleaned_items_count = 0; }
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// After the parallel walk this method must be called to trigger
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// cleaning. Note it might trigger a resize instead.
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static void finish_dead_counter() { check_concurrent_work(); }
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// If GC uses ParState directly it should add the number of cleared
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// strings to this method.
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static void inc_dead_counter(size_t ndead) { add_items_to_clean(ndead); }
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// Probing
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static oop lookup(Symbol* symbol);
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static oop lookup(const jchar* chars, int length);
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// Interning
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static oop intern(Symbol* symbol, TRAPS);
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static oop intern(oop string, TRAPS);
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static oop intern(const char *utf8_string, TRAPS);
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// Rehash the string table if it gets out of balance
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static void rehash_table();
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static bool needs_rehashing() { return _needs_rehashing; }
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static inline void update_needs_rehash(bool rehash) {
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if (rehash) {
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_needs_rehashing = true;
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}
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}
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// Sharing
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private:
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static oop lookup_shared(const jchar* name, int len, unsigned int hash) NOT_CDS_JAVA_HEAP_RETURN_(NULL);
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static void copy_shared_string_table(CompactHashtableWriter* ch_table) NOT_CDS_JAVA_HEAP_RETURN;
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public:
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static oop create_archived_string(oop s, Thread* THREAD) NOT_CDS_JAVA_HEAP_RETURN_(NULL);
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static void shared_oops_do(OopClosure* f) NOT_CDS_JAVA_HEAP_RETURN;
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static void write_to_archive() NOT_CDS_JAVA_HEAP_RETURN;
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static void serialize_shared_table_header(SerializeClosure* soc) NOT_CDS_JAVA_HEAP_RETURN;
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// Jcmd
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static void dump(outputStream* st, bool verbose=false);
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// Debugging
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static size_t verify_and_compare_entries();
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static void verify();
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};
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#endif // SHARE_CLASSFILE_STRINGTABLE_HPP
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