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1 /*
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2 * Copyright 2001-2004 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The specification of a generation. This class also encapsulates
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26 // some generation-specific behavior. This is done here rather than as a
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27 // virtual function of Generation because these methods are needed in
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28 // initialization of the Generations.
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29 class GenerationSpec : public CHeapObj {
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30 friend class VMStructs;
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31 private:
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32 Generation::Name _name;
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33 size_t _init_size;
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34 size_t _max_size;
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35
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36 public:
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37 GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) {
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38 _name = name;
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39 _init_size = init_size;
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40 _max_size = max_size;
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41 }
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42
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43 Generation* init(ReservedSpace rs, int level, GenRemSet* remset);
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44
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45 // Accessors
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46 Generation::Name name() const { return _name; }
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47 size_t init_size() const { return _init_size; }
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48 void set_init_size(size_t size) { _init_size = size; }
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49 size_t max_size() const { return _max_size; }
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50 void set_max_size(size_t size) { _max_size = size; }
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51
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52 // Alignment
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53 void align(size_t alignment) {
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54 set_init_size(align_size_up(init_size(), alignment));
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55 set_max_size(align_size_up(max_size(), alignment));
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56 }
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57
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58 // Return the number of regions contained in the generation which
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59 // might need to be independently covered by a remembered set.
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60 virtual int n_covered_regions() const { return 1; }
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61 };
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62
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63 typedef GenerationSpec* GenerationSpecPtr;
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64
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65 // The specification of a permanent generation. This class is very
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66 // similar to GenerationSpec in use. Due to PermGen's not being a
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67 // true Generation, we cannot combine the spec classes either.
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68 class PermanentGenerationSpec : public CHeapObj {
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69 friend class VMStructs;
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70 private:
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71 PermGen::Name _name;
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72 size_t _init_size;
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73 size_t _max_size;
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74 size_t _read_only_size;
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75 size_t _read_write_size;
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76 size_t _misc_data_size;
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77 size_t _misc_code_size;
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78 bool _enable_shared_spaces;
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79
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80 enum {
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81 _n_spaces = 2
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82 };
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83
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84 public:
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85 PermanentGenerationSpec(PermGen::Name name, size_t init_size,
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86 size_t max_size, size_t read_only_size,
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87 size_t read_write_size, size_t misc_data_size,
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88 size_t misc_code_size);
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89
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90 PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset);
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91
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92 void disable_sharing() {
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93 _enable_shared_spaces = false;
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94 _read_only_size = 0;
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95 _read_write_size = 0;
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96 _misc_data_size = 0;
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97 _misc_code_size = 0;
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98 }
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99
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100 // Accessors
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101 PermGen::Name name() const { return _name; }
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102 size_t init_size() const { return _init_size; }
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103 void set_init_size(size_t size) { _init_size = size; }
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104
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105 // Max size for user DOES NOT include shared spaces.
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106 // Max size for space allocation DOES include shared spaces.
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107 size_t max_size() const {
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108 return _max_size + _read_only_size + _read_write_size;
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109 }
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110
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111 // Need one covered region for the main space, and one for the shared
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112 // spaces (together).
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113 int n_covered_regions() const { return 2; }
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114
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115 void align(size_t alignment);
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116
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117 size_t read_only_size() const { return _read_only_size; }
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118 size_t read_write_size() const { return _read_write_size; }
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119 size_t misc_data_size() const { return _misc_data_size; }
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120 size_t misc_code_size() const { return _misc_code_size; }
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121 bool enable_shared_spaces() const { return _enable_shared_spaces; }
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122 };
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