1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_MEMORY_GENERATIONSPEC_HPP
26 #define SHARE_VM_MEMORY_GENERATIONSPEC_HPP
27
28 #include "memory/generation.hpp"
29 #include "memory/permGen.hpp"
30
31 // The specification of a generation. This class also encapsulates
32 // some generation-specific behavior. This is done here rather than as a
33 // virtual function of Generation because these methods are needed in
34 // initialization of the Generations.
35 class GenerationSpec : public CHeapObj {
36 friend class VMStructs;
37 private:
38 Generation::Name _name;
39 size_t _init_size;
40 size_t _max_size;
41
42 public:
43 GenerationSpec(Generation::Name name, size_t init_size, size_t max_size) {
44 _name = name;
45 _init_size = init_size;
46 _max_size = max_size;
47 }
48
49 Generation* init(ReservedSpace rs, int level, GenRemSet* remset);
50
51 // Accessors
52 Generation::Name name() const { return _name; }
53 size_t init_size() const { return _init_size; }
54 void set_init_size(size_t size) { _init_size = size; }
55 size_t max_size() const { return _max_size; }
56 void set_max_size(size_t size) { _max_size = size; }
57
58 // Alignment
59 void align(size_t alignment) {
60 set_init_size(align_size_up(init_size(), alignment));
61 set_max_size(align_size_up(max_size(), alignment));
62 }
63
64 // Return the number of regions contained in the generation which
65 // might need to be independently covered by a remembered set.
66 virtual int n_covered_regions() const { return 1; }
67 };
68
69 typedef GenerationSpec* GenerationSpecPtr;
70
71 // The specification of a permanent generation. This class is very
72 // similar to GenerationSpec in use. Due to PermGen's not being a
73 // true Generation, we cannot combine the spec classes either.
74 class PermanentGenerationSpec : public CHeapObj {
75 friend class VMStructs;
76 private:
77 PermGen::Name _name;
78 size_t _init_size;
79 size_t _max_size;
80 size_t _read_only_size;
81 size_t _read_write_size;
82 size_t _misc_data_size;
83 size_t _misc_code_size;
84 bool _enable_shared_spaces;
85
86 enum {
87 _n_spaces = 2
88 };
89
90 public:
91 PermanentGenerationSpec(PermGen::Name name, size_t init_size,
92 size_t max_size, size_t read_only_size,
93 size_t read_write_size, size_t misc_data_size,
94 size_t misc_code_size);
95
96 PermGen* init(ReservedSpace rs, size_t init_size, GenRemSet* remset);
97
98 void disable_sharing() {
99 _enable_shared_spaces = false;
100 _read_only_size = 0;
101 _read_write_size = 0;
102 _misc_data_size = 0;
103 _misc_code_size = 0;
104 }
105
106 // Accessors
107 PermGen::Name name() const { return _name; }
108 size_t init_size() const { return _init_size; }
109 void set_init_size(size_t size) { _init_size = size; }
110
111 // Max size for user DOES NOT include shared spaces.
112 // Max size for space allocation DOES include shared spaces.
113 size_t max_size() const {
114 return _max_size + _read_only_size + _read_write_size;
115 }
116
117 // Need one covered region for the main space, and one for the shared
118 // spaces (together).
119 int n_covered_regions() const { return 2; }
120
121 void align(size_t alignment);
122
123 size_t read_only_size() const { return _read_only_size; }
124 size_t read_write_size() const { return _read_write_size; }
125 size_t misc_data_size() const { return _misc_data_size; }
126 size_t misc_code_size() const { return _misc_code_size; }
127 bool enable_shared_spaces() const { return _enable_shared_spaces; }
128 };
129
130 #endif // SHARE_VM_MEMORY_GENERATIONSPEC_HPP