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comparison agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegion.java @ 3972:4f93f0d00802

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7059019: G1: add G1 support to the SA Summary: Extend the SA to recognize the G1CollectedHeap and implement any code that's needed by our serviceability tools (jmap, jinfo, jstack, etc.) that depend on the SA. Reviewed-by: never, poonam, johnc
author tonyp
date Tue, 20 Sep 2011 09:59:59 -0400
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children 1526a938e670
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3953:77e1a9153757 3972:4f93f0d00802
1 /*
2 * Copyright (c) 2011, 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 package sun.jvm.hotspot.gc_implementation.g1;
26
27 import java.util.Observable;
28 import java.util.Observer;
29
30 import sun.jvm.hotspot.debugger.Address;
31 import sun.jvm.hotspot.memory.ContiguousSpace;
32 import sun.jvm.hotspot.runtime.VM;
33 import sun.jvm.hotspot.types.CIntegerField;
34 import sun.jvm.hotspot.types.Type;
35 import sun.jvm.hotspot.types.TypeDataBase;
36
37 // Mirror class for HeapRegion. Currently we don't actually include
38 // any of its fields but only iterate over it (which we get "for free"
39 // as HeapRegion ultimately inherits from ContiguousSpace).
40
41 public class HeapRegion extends ContiguousSpace {
42 // static int GrainBytes;
43 static private CIntegerField grainBytesField;
44
45 static {
46 VM.registerVMInitializedObserver(new Observer() {
47 public void update(Observable o, Object data) {
48 initialize(VM.getVM().getTypeDataBase());
49 }
50 });
51 }
52
53 static private synchronized void initialize(TypeDataBase db) {
54 Type type = db.lookupType("HeapRegion");
55
56 grainBytesField = type.getCIntegerField("GrainBytes");
57 }
58
59 static public long grainBytes() {
60 return grainBytesField.getValue();
61 }
62
63 public HeapRegion(Address addr) {
64 super(addr);
65 }
66 }