1 /*
2 * Copyright (c) 2001, 2004, 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 // 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 };