1 /*

     2  * Copyright 2001-2004 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 // The specification of a generation.  This class also encapsulates

    26 // some generation-specific behavior.  This is done here rather than as a

    27 // virtual function of Generation because these methods are needed in

    28 // initialization of the Generations.

    29 class GenerationSpec : public CHeapObj {

    30   friend class VMStructs;

    31 private:

    32   Generation::Name _name;

    33   size_t           _init_size;

    34   size_t           _max_size;

    35 

    36 public:

    37   GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) {

    38     _name = name;

    39     _init_size = init_size;

    40     _max_size = max_size;

    41   }

    42 

    43   Generation* init(ReservedSpace rs, int level, GenRemSet* remset);

    44 

    45   // Accessors

    46   Generation::Name name()        const { return _name; }

    47   size_t init_size()             const { return _init_size; }

    48   void set_init_size(size_t size)      { _init_size = size; }

    49   size_t max_size()              const { return _max_size; }

    50   void set_max_size(size_t size)       { _max_size = size; }

    51 

    52   // Alignment

    53   void align(size_t alignment) {

    54     set_init_size(align_size_up(init_size(), alignment));

    55     set_max_size(align_size_up(max_size(), alignment));

    56   }

    57 

    58   // Return the number of regions contained in the generation which

    59   // might need to be independently covered by a remembered set.

    60   virtual int n_covered_regions() const { return 1; }

    61 };

    62 

    63 typedef GenerationSpec* GenerationSpecPtr;

    64 

    65 // The specification of a permanent generation. This class is very

    66 // similar to GenerationSpec in use. Due to PermGen's not being a

    67 // true Generation, we cannot combine the spec classes either.

    68 class PermanentGenerationSpec : public CHeapObj {

    69   friend class VMStructs;

    70 private:

    71   PermGen::Name    _name;

    72   size_t           _init_size;

    73   size_t           _max_size;

    74   size_t           _read_only_size;

    75   size_t           _read_write_size;

    76   size_t           _misc_data_size;

    77   size_t           _misc_code_size;

    78   bool             _enable_shared_spaces;

    79 

    80   enum {

    81     _n_spaces = 2

    82   };

    83 

    84 public:

    85   PermanentGenerationSpec(PermGen::Name name, size_t init_size,

    86                           size_t max_size, size_t read_only_size,

    87                           size_t read_write_size, size_t misc_data_size,

    88                           size_t misc_code_size);

    89 

    90   PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset);

    91 

    92   void disable_sharing() {

    93     _enable_shared_spaces = false;

    94     _read_only_size = 0;

    95     _read_write_size = 0;

    96     _misc_data_size = 0;

    97     _misc_code_size = 0;

    98   }

    99 

   100   // Accessors

   101   PermGen::Name name()           const { return _name; }

   102   size_t init_size()             const { return _init_size; }

   103   void set_init_size(size_t size)      { _init_size = size; }

   104 

   105   // Max size for user DOES NOT include shared spaces.

   106   // Max size for space allocation DOES include shared spaces.

   107   size_t max_size() const {

   108     return _max_size + _read_only_size + _read_write_size;

   109   }

   110 

   111   // Need one covered region for the main space, and one for the shared

   112   // spaces (together).

   113   int n_covered_regions() const { return 2; }

   114 

   115   void align(size_t alignment);

   116 

   117   size_t read_only_size() const { return _read_only_size; }

   118   size_t read_write_size() const { return _read_write_size; }

   119   size_t misc_data_size() const { return _misc_data_size; }

   120   size_t misc_code_size() const { return _misc_code_size; }

   121   bool enable_shared_spaces()    const { return _enable_shared_spaces; }

   122 };