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comparison agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionSeq.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
parents
children 720b6a76dd9d
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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.Iterator;
28 import java.util.Observable;
29 import java.util.Observer;
30
31 import sun.jvm.hotspot.debugger.Address;
32 import sun.jvm.hotspot.runtime.VM;
33 import sun.jvm.hotspot.runtime.VMObject;
34 import sun.jvm.hotspot.runtime.VMObjectFactory;
35 import sun.jvm.hotspot.types.AddressField;
36 import sun.jvm.hotspot.types.CIntegerField;
37 import sun.jvm.hotspot.types.Type;
38 import sun.jvm.hotspot.types.TypeDataBase;
39
40 // Mirror class for HeapRegionSeq. It's essentially an index -> HeapRegion map.
41
42 public class HeapRegionSeq extends VMObject {
43 // HeapRegion** _regions;
44 static private AddressField regionsField;
45 // size_t _length;
46 static private CIntegerField lengthField;
47
48 static {
49 VM.registerVMInitializedObserver(new Observer() {
50 public void update(Observable o, Object data) {
51 initialize(VM.getVM().getTypeDataBase());
52 }
53 });
54 }
55
56 static private synchronized void initialize(TypeDataBase db) {
57 Type type = db.lookupType("HeapRegionSeq");
58
59 regionsField = type.getAddressField("_regions");
60 lengthField = type.getCIntegerField("_length");
61 }
62
63 private HeapRegion at(long index) {
64 Address arrayAddr = regionsField.getValue(addr);
65 // Offset of &_region[index]
66 long offset = index * VM.getVM().getAddressSize();
67 Address regionAddr = arrayAddr.getAddressAt(offset);
68 return (HeapRegion) VMObjectFactory.newObject(HeapRegion.class,
69 regionAddr);
70 }
71
72 public long length() {
73 return lengthField.getValue(addr);
74 }
75
76 private class HeapRegionIterator implements Iterator<HeapRegion> {
77 private long index;
78 private long length;
79
80 @Override
81 public boolean hasNext() { return index < length; }
82
83 @Override
84 public HeapRegion next() { return at(index++); }
85
86 @Override
87 public void remove() { /* not supported */ }
88
89 HeapRegionIterator(Address addr) {
90 index = 0;
91 length = length();
92 }
93 }
94
95 public Iterator<HeapRegion> heapRegionIterator() {
96 return new HeapRegionIterator(addr);
97 }
98
99 public HeapRegionSeq(Address addr) {
100 super(addr);
101 }
102 }