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24 
25 package sun.jvm.hotspot.oops;
26 
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.memory.*;
30 import sun.jvm.hotspot.utilities.*;
31 import sun.jvm.hotspot.debugger.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34 import sun.jvm.hotspot.utilities.Observable;
35 import sun.jvm.hotspot.utilities.Observer;
36 
37 abstract public class Metadata extends VMObject {
38   static {
VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } })39     VM.registerVMInitializedObserver(new Observer() {
40         public void update(Observable o, Object data) {
41           initialize(VM.getVM().getTypeDataBase());
42         }
43       });
44   }
45 
Metadata(Address addr)46   public Metadata(Address addr) {
47     super(addr);
48   }
49 
alignSize(long size)50   public static long alignSize(long size) {
51     // natural word size.
52     return VM.getVM().alignUp(size, VM.getVM().getBytesPerWord());
53   }
54 
55   private static VirtualBaseConstructor<Metadata> metadataConstructor;
56 
initialize(TypeDataBase db)57   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
58     metadataConstructor = new VirtualBaseConstructor<>(db, db.lookupType("Metadata"), null, null);
59     // Define an explicit mapping since the C++ and Java type names don't match.
60     metadataConstructor.addMapping("Metadata", Metadata.class);
61     metadataConstructor.addMapping("Klass", Klass.class);
62     metadataConstructor.addMapping("InstanceKlass", InstanceKlass.class);
63     metadataConstructor.addMapping("InstanceMirrorKlass", InstanceMirrorKlass.class);
64     metadataConstructor.addMapping("InstanceRefKlass", InstanceRefKlass.class);
65     metadataConstructor.addMapping("InstanceClassLoaderKlass", InstanceClassLoaderKlass.class);
66     metadataConstructor.addMapping("TypeArrayKlass", TypeArrayKlass.class);
67     metadataConstructor.addMapping("ObjArrayKlass", ObjArrayKlass.class);
68     metadataConstructor.addMapping("Method", Method.class);
69     metadataConstructor.addMapping("MethodData", MethodData.class);
70     metadataConstructor.addMapping("ConstMethod", ConstMethod.class);
71     metadataConstructor.addMapping("ConstantPool", ConstantPool.class);
72     metadataConstructor.addMapping("ConstantPoolCache", ConstantPoolCache.class);
73   }
74 
instantiateWrapperFor(Address addr)75   public static Metadata instantiateWrapperFor(Address addr) {
76     return metadataConstructor.instantiateWrapperFor(addr);
77   }
78 
iterate(MetadataVisitor visitor)79   public void iterate(MetadataVisitor visitor) {
80     visitor.setObj(this);
81     visitor.prologue();
82     iterateFields(visitor);
83     visitor.epilogue();
84   }
85 
iterateFields(MetadataVisitor visitor)86   void iterateFields(MetadataVisitor visitor) {
87   }
88 
printValueOn(PrintStream tty)89   abstract public void printValueOn(PrintStream tty);
dumpReplayData(PrintStream out)90   public void dumpReplayData(PrintStream out) {
91       out.println("# Unknown Metadata");
92   }
93 
isShared()94   public boolean isShared() {
95     VM vm = VM.getVM();
96     if (vm.isSharingEnabled()) {
97       return MetaspaceObj.isShared(getAddress());
98     }
99     return false;
100   }
101 }
102