Thu, 12 Jun 2008 13:50:55 -0700
Merge
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 */
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.
29 class Generation;
30 class GenRemSet;
31 class CSpaceCounters;
33 // PermGen models the part of the heap
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
41 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen);
43 public:
44 enum Name {
45 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep
46 };
48 // Permanent allocation (initialized)
49 virtual HeapWord* mem_allocate(size_t size) = 0;
51 // Mark sweep support
52 virtual void compute_new_size() = 0;
54 // Ideally, we would use MI (IMHO) but we'll do delegation instead.
55 virtual Generation* as_gen() const = 0;
57 virtual void oop_iterate(OopClosure* cl) {
58 Generation* g = as_gen();
59 assert(g != NULL, "as_gen() NULL");
60 g->oop_iterate(cl);
61 }
63 virtual void object_iterate(ObjectClosure* cl) {
64 Generation* g = as_gen();
65 assert(g != NULL, "as_gen() NULL");
66 g->object_iterate(cl);
67 }
69 // Performance Counter support
70 virtual void update_counters() {
71 Generation* g = as_gen();
72 assert(g != NULL, "as_gen() NULL");
73 g->update_counters();
74 }
75 };