1 /*
2 * Copyright (c) 2012, 2022, 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.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 public abstract class Metadata extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 public Metadata(Address addr) {
47 super(addr);
48 }
49
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
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("InstanceStackChunkKlass", InstanceStackChunkKlass.class);
67 metadataConstructor.addMapping("TypeArrayKlass", TypeArrayKlass.class);
68 metadataConstructor.addMapping("ObjArrayKlass", ObjArrayKlass.class);
69 metadataConstructor.addMapping("Method", Method.class);
70 metadataConstructor.addMapping("MethodData", MethodData.class);
71 metadataConstructor.addMapping("ConstMethod", ConstMethod.class);
72 metadataConstructor.addMapping("ConstantPool", ConstantPool.class);
73 metadataConstructor.addMapping("ConstantPoolCache", ConstantPoolCache.class);
74 metadataConstructor.addMapping("Annotations", Annotations.class);
75 }
76
77 public static Metadata instantiateWrapperFor(Address addr) {
78 return metadataConstructor.instantiateWrapperFor(addr);
79 }
80
81 public void iterate(MetadataVisitor visitor) {
82 visitor.setObj(this);
83 visitor.prologue();
84 iterateFields(visitor);
85 visitor.epilogue();
86 }
87
88 void iterateFields(MetadataVisitor visitor) {
89 }
90
91 public abstract void printValueOn(PrintStream tty);
92 public void dumpReplayData(PrintStream out) {
93 out.println("# Unknown Metadata");
94 }
95
96 public boolean isShared() {
97 VM vm = VM.getVM();
98 if (vm.isSharingEnabled()) {
99 return MetaspaceObj.isShared(getAddress());
100 }
101 return false;
102 }
103 }