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comparison agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegion.java @ 20276:1526a938e670

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8047818: G1 HeapRegions can no longer be ContiguousSpaces Summary: Change parent of G1OffsetTableContigSpace to CompactibleSpace, reimplement missing functionality Reviewed-by: stefank, jmasa, tschatzl
author mgerdin
date Thu, 26 Jun 2014 11:36:58 +0200
parents 4f93f0d00802
children
comparison
equal deleted inserted replaced
20275:e5035defa3c4 20276:1526a938e670
22 * 22 *
23 */ 23 */
24 24
25 package sun.jvm.hotspot.gc_implementation.g1; 25 package sun.jvm.hotspot.gc_implementation.g1;
26 26
27 import java.util.ArrayList;
28 import java.util.List;
27 import java.util.Observable; 29 import java.util.Observable;
28 import java.util.Observer; 30 import java.util.Observer;
29
30 import sun.jvm.hotspot.debugger.Address; 31 import sun.jvm.hotspot.debugger.Address;
31 import sun.jvm.hotspot.memory.ContiguousSpace; 32 import sun.jvm.hotspot.memory.CompactibleSpace;
33 import sun.jvm.hotspot.memory.MemRegion;
32 import sun.jvm.hotspot.runtime.VM; 34 import sun.jvm.hotspot.runtime.VM;
35 import sun.jvm.hotspot.types.AddressField;
33 import sun.jvm.hotspot.types.CIntegerField; 36 import sun.jvm.hotspot.types.CIntegerField;
34 import sun.jvm.hotspot.types.Type; 37 import sun.jvm.hotspot.types.Type;
35 import sun.jvm.hotspot.types.TypeDataBase; 38 import sun.jvm.hotspot.types.TypeDataBase;
36 39
37 // Mirror class for HeapRegion. Currently we don't actually include 40 // 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" 41 // any of its fields but only iterate over it.
39 // as HeapRegion ultimately inherits from ContiguousSpace).
40 42
41 public class HeapRegion extends ContiguousSpace { 43 public class HeapRegion extends CompactibleSpace {
42 // static int GrainBytes; 44 // static int GrainBytes;
43 static private CIntegerField grainBytesField; 45 static private CIntegerField grainBytesField;
46 static private AddressField topField;
44 47
45 static { 48 static {
46 VM.registerVMInitializedObserver(new Observer() { 49 VM.registerVMInitializedObserver(new Observer() {
47 public void update(Observable o, Object data) { 50 public void update(Observable o, Object data) {
48 initialize(VM.getVM().getTypeDataBase()); 51 initialize(VM.getVM().getTypeDataBase());
52 55
53 static private synchronized void initialize(TypeDataBase db) { 56 static private synchronized void initialize(TypeDataBase db) {
54 Type type = db.lookupType("HeapRegion"); 57 Type type = db.lookupType("HeapRegion");
55 58
56 grainBytesField = type.getCIntegerField("GrainBytes"); 59 grainBytesField = type.getCIntegerField("GrainBytes");
60 topField = type.getAddressField("_top");
61
57 } 62 }
58 63
59 static public long grainBytes() { 64 static public long grainBytes() {
60 return grainBytesField.getValue(); 65 return grainBytesField.getValue();
61 } 66 }
62 67
63 public HeapRegion(Address addr) { 68 public HeapRegion(Address addr) {
64 super(addr); 69 super(addr);
65 } 70 }
71
72 public Address top() {
73 return topField.getValue(addr);
74 }
75
76 @Override
77 public List getLiveRegions() {
78 List res = new ArrayList();
79 res.add(new MemRegion(bottom(), top()));
80 return res;
81 }
82
83 @Override
84 public long used() {
85 return top().minus(bottom());
86 }
87
88 @Override
89 public long free() {
90 return end().minus(top());
91 }
66 } 92 }