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comparison src/share/vm/memory/permGen.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c0492d52d55b
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1 /*
2 * Copyright 2000-2005 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 // All heaps contains a "permanent generation," containing permanent
26 // (reflective) objects. This is like a regular generation in some ways,
27 // but unlike one in others, and so is split apart.
28
29 class Generation;
30 class GenRemSet;
31 class CSpaceCounters;
32
33 // PermGen models the part of the heap
34
35 class PermGen : public CHeapObj {
36 friend class VMStructs;
37 protected:
38 size_t _capacity_expansion_limit; // maximum expansion allowed without a
39 // full gc occuring
40
41 public:
42 enum Name {
43 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep
44 };
45
46 // Permanent allocation (initialized)
47 virtual HeapWord* mem_allocate(size_t size) = 0;
48
49 // Mark sweep support
50 virtual void compute_new_size() = 0;
51
52 // Ideally, we would use MI (IMHO) but we'll do delegation instead.
53 virtual Generation* as_gen() const = 0;
54
55 virtual void oop_iterate(OopClosure* cl) {
56 Generation* g = as_gen();
57 assert(g != NULL, "as_gen() NULL");
58 g->oop_iterate(cl);
59 }
60
61 virtual void object_iterate(ObjectClosure* cl) {
62 Generation* g = as_gen();
63 assert(g != NULL, "as_gen() NULL");
64 g->object_iterate(cl);
65 }
66
67 // Performance Counter support
68 virtual void update_counters() {
69 Generation* g = as_gen();
70 assert(g != NULL, "as_gen() NULL");
71 g->update_counters();
72 }
73 };