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.z;
26
27 import sun.jvm.hotspot.debugger.Address;
28 import sun.jvm.hotspot.runtime.VM;
29 import sun.jvm.hotspot.runtime.VMObject;
30 import sun.jvm.hotspot.runtime.VMObjectFactory;
31 import sun.jvm.hotspot.types.CIntegerField;
32 import sun.jvm.hotspot.types.Type;
33 import sun.jvm.hotspot.types.TypeDataBase;
34
35 public class ZPage extends VMObject {
36 private static CIntegerField typeField;
37 private static long virtualFieldOffset;
38 private static long forwardingFieldOffset;
39
40 static {
41 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
42 }
43
44 static private synchronized void initialize(TypeDataBase db) {
45 Type type = db.lookupType("ZPage");
46
47 typeField = type.getCIntegerField("_type");
48 virtualFieldOffset = type.getField("_virtual").getOffset();
49 forwardingFieldOffset = type.getField("_forwarding").getOffset();
50 }
51
52 public ZPage(Address addr) {
53 super(addr);
54 }
55
56 private byte type() {
57 return typeField.getJByte(addr);
58 }
59
60 private ZVirtualMemory virtual() {
61 return (ZVirtualMemory)VMObjectFactory.newObject(ZVirtualMemory.class, addr.addOffsetTo(virtualFieldOffset));
62 }
63
64 private ZForwardingTable forwarding() {
65 return (ZForwardingTable)VMObjectFactory.newObject(ZForwardingTable.class, addr.addOffsetTo(forwardingFieldOffset));
66 }
67
68 private long start() {
69 return virtual().start();
70 }
71
72 Address forward_object(Address from) {
73 // Lookup address in forwarding table
74 long from_offset = ZAddress.offset(from);
75 long from_index = (from_offset - start()) >> object_alignment_shift();
76 ZForwardingTableEntry entry = forwarding().find(from_index);
77 assert(!entry.is_empty());
78 assert(entry.from_index() == from_index);
79
80 return ZAddress.good(entry.to_offset());
81 }
82
83 Address relocate_object(Address from) {
84 // Lookup address in forwarding table
85 long from_offset = ZAddress.offset(from);
86 long from_index = (from_offset - start()) >> object_alignment_shift();
87 ZForwardingTableEntry entry = forwarding().find(from_index);
88 if (!entry.is_empty() && entry.from_index() == from_index) {
89 return ZAddress.good(entry.to_offset());
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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.z;
26
27 import sun.jvm.hotspot.debugger.Address;
28 import sun.jvm.hotspot.runtime.VM;
29 import sun.jvm.hotspot.runtime.VMObject;
30 import sun.jvm.hotspot.runtime.VMObjectFactory;
31 import sun.jvm.hotspot.types.CIntegerField;
32 import sun.jvm.hotspot.types.Type;
33 import sun.jvm.hotspot.types.TypeDataBase;
34
35 public class ZPage extends VMObject {
36 private static CIntegerField typeField;
37 private static long virtualFieldOffset;
38 private static CIntegerField topField;
39 private static CIntegerField refcountField;
40 private static long forwardingFieldOffset;
41
42 static {
43 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase()));
44 }
45
46 static private synchronized void initialize(TypeDataBase db) {
47 Type type = db.lookupType("ZPage");
48
49 typeField = type.getCIntegerField("_type");
50 virtualFieldOffset = type.getField("_virtual").getOffset();
51 topField = type.getCIntegerField("_top");
52 refcountField = type.getCIntegerField("_refcount");
53 forwardingFieldOffset = type.getField("_forwarding").getOffset();
54 }
55
56 public ZPage(Address addr) {
57 super(addr);
58 }
59
60 private byte type() {
61 return typeField.getJByte(addr);
62 }
63
64 private ZVirtualMemory virtual() {
65 return (ZVirtualMemory)VMObjectFactory.newObject(ZVirtualMemory.class, addr.addOffsetTo(virtualFieldOffset));
66 }
67
68 private ZForwardingTable forwarding() {
69 return (ZForwardingTable)VMObjectFactory.newObject(ZForwardingTable.class, addr.addOffsetTo(forwardingFieldOffset));
70 }
71
72 public long start() {
73 return virtual().start();
74 }
75
76 public long top() {
77 return topField.getJLong(addr);
78 }
79
80 public int refcount() {
81 return topField.getJInt(addr);
82 }
83
84 Address forward_object(Address from) {
85 // Lookup address in forwarding table
86 long from_offset = ZAddress.offset(from);
87 long from_index = (from_offset - start()) >> object_alignment_shift();
88 ZForwardingTableEntry entry = forwarding().find(from_index);
89 assert(!entry.is_empty());
90 assert(entry.from_index() == from_index);
91
92 return ZAddress.good(entry.to_offset());
93 }
94
95 Address relocate_object(Address from) {
96 // Lookup address in forwarding table
97 long from_offset = ZAddress.offset(from);
98 long from_index = (from_offset - start()) >> object_alignment_shift();
99 ZForwardingTableEntry entry = forwarding().find(from_index);
100 if (!entry.is_empty() && entry.from_index() == from_index) {
101 return ZAddress.good(entry.to_offset());
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