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src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/BasicObjectLock.java

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25 package sun.jvm.hotspot.runtime;
26 
27 import java.util.*;
28 
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31 import sun.jvm.hotspot.utilities.Observable;
32 import sun.jvm.hotspot.utilities.Observer;
33 
34 public class BasicObjectLock extends VMObject {
35   static {
36     VM.registerVMInitializedObserver(new Observer() {
37         public void update(Observable o, Object data) {
38           initialize(VM.getVM().getTypeDataBase());
39         }
40       });
41   }
42 
43   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
44     Type type  = db.lookupType("BasicObjectLock");
45     lockField  = type.getField("_lock");
46     objField   = type.getOopField("_obj");
47     size       = (int) type.getSize();
48   }
49 
50   private static sun.jvm.hotspot.types.Field    lockField;
51   private static sun.jvm.hotspot.types.OopField objField;
52   private static int        size;
53 
54   public BasicObjectLock(Address addr) {
55     super(addr);
56   }
57 
58   public OopHandle obj()  { return objField.getValue(addr); }
59   public BasicLock lock() { return new BasicLock(addr.addOffsetTo(lockField.getOffset())); }
60 
61   /** Note: Use frame::interpreter_frame_monitor_size() for the size
62       of BasicObjectLocks in interpreter activation frames since it
63       includes machine-specific padding. This routine returns a size
64       in BYTES in this system! */
65   public static int size() { return size; }
66 
67   /** Helper routine for Frames (also probably needed for iteration) */
68   public Address address() { return addr; }
69 }

25 package sun.jvm.hotspot.runtime;
26 
27 import java.util.*;
28 
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31 import sun.jvm.hotspot.utilities.Observable;
32 import sun.jvm.hotspot.utilities.Observer;
33 
34 public class BasicObjectLock extends VMObject {
35   static {
36     VM.registerVMInitializedObserver(new Observer() {
37         public void update(Observable o, Object data) {
38           initialize(VM.getVM().getTypeDataBase());
39         }
40       });
41   }
42 
43   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
44     Type type  = db.lookupType("BasicObjectLock");

45     objField   = type.getOopField("_obj");
46     size       = (int) type.getSize();
47   }
48 

49   private static sun.jvm.hotspot.types.OopField objField;
50   private static int        size;
51 
52   public BasicObjectLock(Address addr) {
53     super(addr);
54   }
55 
56   public OopHandle obj()  { return objField.getValue(addr); }

57 
58   /** Note: Use frame::interpreter_frame_monitor_size() for the size
59       of BasicObjectLocks in interpreter activation frames since it
60       includes machine-specific padding. This routine returns a size
61       in BYTES in this system! */
62   public static int size() { return size; }
63 
64   /** Helper routine for Frames (also probably needed for iteration) */
65   public Address address() { return addr; }
66 }
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