hotspot/src/share/vm/memory/freeBlockDictionary.hpp
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/*
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 * Copyright (c) 2001, 2012, 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_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
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#define SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP
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#include "memory/allocation.hpp"
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#include "runtime/mutex.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ostream.hpp"
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// A FreeBlockDictionary is an abstract superclass that will allow
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// a number of alternative implementations in the future.
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template <class Chunk>
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class FreeBlockDictionary: public CHeapObj<mtGC> {
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 public:
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  enum Dither {
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    atLeast,
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    exactly,
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    roughly
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  };
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  enum DictionaryChoice {
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    dictionaryBinaryTree = 0,
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    dictionarySplayTree  = 1,
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    dictionarySkipList   = 2
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  };
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 private:
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  // This field is added and can be set to point to the
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  // the Mutex used to synchronize access to the
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  // dictionary so that assertion checking can be done.
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  // For example it is set to point to _parDictionaryAllocLock.
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  NOT_PRODUCT(Mutex* _lock;)
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 public:
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  virtual void       remove_chunk(Chunk* fc) = 0;
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  virtual Chunk*     get_chunk(size_t size, Dither dither = atLeast) = 0;
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  virtual void       return_chunk(Chunk* chunk) = 0;
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  virtual size_t     total_chunk_size(debug_only(const Mutex* lock)) const = 0;
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  virtual size_t     max_chunk_size()   const = 0;
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  virtual size_t     min_size()        const = 0;
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  // Reset the dictionary to the initial conditions for a single
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  // block.
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  virtual void       reset(HeapWord* addr, size_t size) = 0;
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  virtual void       reset() = 0;
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  virtual void       dict_census_update(size_t size, bool split, bool birth) = 0;
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  virtual bool       coal_dict_over_populated(size_t size) = 0;
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  virtual void       begin_sweep_dict_census(double coalSurplusPercent,
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                       float inter_sweep_current, float inter_sweep_estimate,
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                       float intra__sweep_current) = 0;
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  virtual void       end_sweep_dict_census(double splitSurplusPercent) = 0;
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  virtual Chunk*     find_largest_dict() const = 0;
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  // verify that the given chunk is in the dictionary.
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  virtual bool verify_chunk_in_free_list(Chunk* tc) const = 0;
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  // Sigma_{all_free_blocks} (block_size^2)
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  virtual double sum_of_squared_block_sizes() const = 0;
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  virtual Chunk* find_chunk_ends_at(HeapWord* target) const = 0;
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  virtual void inc_total_size(size_t v) = 0;
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  virtual void dec_total_size(size_t v) = 0;
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  NOT_PRODUCT (
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    virtual size_t   sum_dict_returned_bytes() = 0;
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    virtual void     initialize_dict_returned_bytes() = 0;
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    virtual size_t   total_count() = 0;
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  )
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  virtual void       report_statistics() const {
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    gclog_or_tty->print("No statistics available");
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  }
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  virtual void       print_dict_census() const = 0;
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  virtual void       print_free_lists(outputStream* st) const = 0;
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  virtual void       verify()         const = 0;
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  Mutex* par_lock()                const PRODUCT_RETURN0;
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  void   set_par_lock(Mutex* lock)       PRODUCT_RETURN;
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  void   verify_par_locked()       const PRODUCT_RETURN;
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};
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#endif // SHARE_VM_MEMORY_FREEBLOCKDICTIONARY_HPP