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comparison agent/src/share/classes/sun/jvm/hotspot/oops/java_lang_Class.java @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents e6b1331a51d2
children 8e47bac5643a
comparison
equal deleted inserted replaced
6724:36d1d483d5d6 6725:da91efe96a93
1 /* 1 /*
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
27 import java.util.*; 27 import java.util.*;
28 28
29 import sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*; 30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.runtime.*; 31 import sun.jvm.hotspot.runtime.*;
32 import sun.jvm.hotspot.types.AddressField;
32 import sun.jvm.hotspot.types.Type; 33 import sun.jvm.hotspot.types.Type;
33 import sun.jvm.hotspot.types.TypeDataBase; 34 import sun.jvm.hotspot.types.TypeDataBase;
34 import sun.jvm.hotspot.utilities.*; 35 import sun.jvm.hotspot.utilities.*;
35 import sun.jvm.hotspot.jdi.JVMTIThreadState; 36 import sun.jvm.hotspot.jdi.JVMTIThreadState;
36 37
38 39
39 // initialize fields for java.lang.Class 40 // initialize fields for java.lang.Class
40 public class java_lang_Class { 41 public class java_lang_Class {
41 42
42 // java.lang.Class fields 43 // java.lang.Class fields
43 static OopField klassField; 44 static int klassOffset;
44 static IntField oopSizeField; 45 static IntField oopSizeField;
45 46
46 static { 47 static {
47 VM.registerVMInitializedObserver(new Observer() { 48 VM.registerVMInitializedObserver(new Observer() {
48 public void update(Observable o, Object data) { 49 public void update(Observable o, Object data) {
53 54
54 private static synchronized void initialize(TypeDataBase db) { 55 private static synchronized void initialize(TypeDataBase db) {
55 // klass and oop_size are HotSpot magic fields and hence we can't 56 // klass and oop_size are HotSpot magic fields and hence we can't
56 // find them from InstanceKlass for java.lang.Class. 57 // find them from InstanceKlass for java.lang.Class.
57 Type jlc = db.lookupType("java_lang_Class"); 58 Type jlc = db.lookupType("java_lang_Class");
58 int klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue(); 59 klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue();
59 if (VM.getVM().isCompressedOopsEnabled()) {
60 klassField = new NarrowOopField(new NamedFieldIdentifier("klass"), klassOffset, true);
61 } else {
62 klassField = new OopField(new NamedFieldIdentifier("klass"), klassOffset, true);
63 }
64 int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue(); 60 int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue();
65 oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true); 61 oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true);
66 } 62 }
67 63
68 /** get klassOop field at offset hc_klass_offset from a java.lang.Class object */ 64 /** get Klass* field at offset hc_klass_offset from a java.lang.Class object */
69 public static Klass asKlass(Oop aClass) { 65 public static Klass asKlass(Oop aClass) {
70 return (Klass) java_lang_Class.klassField.getValue(aClass); 66 if (VM.getVM().isCompressedHeadersEnabled()) {
67 throw new InternalError("unimplemented");
68 } else {
69 return (Klass)Metadata.instantiateWrapperFor(aClass.getHandle().getAddressAt(klassOffset));
70 }
71 } 71 }
72 72
73 /** get oop_size field at offset oop_size_offset from a java.lang.Class object */ 73 /** get oop_size field at offset oop_size_offset from a java.lang.Class object */
74 public static long getOopSize(Oop aClass) { 74 public static long getOopSize(Oop aClass) {
75 return java_lang_Class.oopSizeField.getValue(aClass); 75 return java_lang_Class.oopSizeField.getValue(aClass);