text: /*
   * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   *
   */
  
  #ifndef SHARE_VM_MEMORY_GENERATIONSPEC_HPP
  #define SHARE_VM_MEMORY_GENERATIONSPEC_HPP
  
  #include "memory/generation.hpp"
  #include "memory/permGen.hpp"
  
  // The specification of a generation.  This class also encapsulates
  // some generation-specific behavior.  This is done here rather than as a
  // virtual function of Generation because these methods are needed in
  // initialization of the Generations.
  class GenerationSpec : public CHeapObj {
    friend class VMStructs;
  private:
    Generation::Name _name;
    size_t           _init_size;
    size_t           _max_size;
  
  public:
    GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) {
      _name = name;
      _init_size = init_size;
      _max_size = max_size;
    }
  
    Generation* init(ReservedSpace rs, int level, GenRemSet* remset);
  
    // Accessors
    Generation::Name name()        const { return _name; }
    size_t init_size()             const { return _init_size; }
    void set_init_size(size_t size)      { _init_size = size; }
    size_t max_size()              const { return _max_size; }
    void set_max_size(size_t size)       { _max_size = size; }
  
    // Alignment
    void align(size_t alignment) {
      set_init_size(align_size_up(init_size(), alignment));
      set_max_size(align_size_up(max_size(), alignment));
    }
  
    // Return the number of regions contained in the generation which
    // might need to be independently covered by a remembered set.
    virtual int n_covered_regions() const { return 1; }
  };
  
  typedef GenerationSpec* GenerationSpecPtr;
  
  // The specification of a permanent generation. This class is very
  // similar to GenerationSpec in use. Due to PermGen's not being a
  // true Generation, we cannot combine the spec classes either.
  class PermanentGenerationSpec : public CHeapObj {
    friend class VMStructs;
  private:
    PermGen::Name    _name;
    size_t           _init_size;
    size_t           _max_size;
    size_t           _read_only_size;
    size_t           _read_write_size;
    size_t           _misc_data_size;
    size_t           _misc_code_size;
    bool             _enable_shared_spaces;
  
    enum {
      _n_spaces = 2
    };
  
  public:
    PermanentGenerationSpec(PermGen::Name name, size_t init_size,
                            size_t max_size, size_t read_only_size,
                            size_t read_write_size, size_t misc_data_size,
                            size_t misc_code_size);
  
    PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset);
  
    void disable_sharing() {
      _enable_shared_spaces = false;
      _read_only_size = 0;
      _read_write_size = 0;
      _misc_data_size = 0;
      _misc_code_size = 0;
    }
  
    // Accessors
    PermGen::Name name()           const { return _name; }
    size_t init_size()             const { return _init_size; }
    void set_init_size(size_t size)      { _init_size = size; }
  
    // Max size for user DOES NOT include shared spaces.
    // Max size for space allocation DOES include shared spaces.
    size_t max_size() const {
      return _max_size + _read_only_size + _read_write_size;
    }
  
    // Need one covered region for the main space, and one for the shared
    // spaces (together).
    int n_covered_regions() const { return 2; }
  
    void align(size_t alignment);
  
    size_t read_only_size() const { return _read_only_size; }
    size_t read_write_size() const { return _read_write_size; }
    size_t misc_data_size() const { return _misc_data_size; }
    size_t misc_code_size() const { return _misc_code_size; }
    bool enable_shared_spaces()    const { return _enable_shared_spaces; }
  };
  
  #endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP
  