1 /*
2 * Copyright (c) 2011, 2016, 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 *
24
25 package sun.jvm.hotspot.oops;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.runtime.*;
32 import sun.jvm.hotspot.types.AddressField;
33 import sun.jvm.hotspot.types.Type;
34 import sun.jvm.hotspot.types.TypeDataBase;
35 import sun.jvm.hotspot.utilities.*;
36
37 /** A utility class encapsulating useful oop operations */
38
39 // initialize fields for java.lang.Class
40 public class java_lang_Class {
41
42 // java.lang.Class fields
43 static int klassOffset;
44 static IntField oopSizeField;
45
46 static {
47 VM.registerVMInitializedObserver(new Observer() {
48 public void update(Observable o, Object data) {
49 initialize(VM.getVM().getTypeDataBase());
50 }
51 });
52 }
53
54 private static synchronized void initialize(TypeDataBase db) {
55 // klass and oop_size are HotSpot magic fields and hence we can't
56 // find them from InstanceKlass for java.lang.Class.
57 Type jlc = db.lookupType("java_lang_Class");
58 klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue();
59 int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue();
60 oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true);
61 }
62
63 /** get Klass* field at offset hc_klass_offset from a java.lang.Class object */
64 public static Klass asKlass(Oop aClass) {
65 return (Klass)Metadata.instantiateWrapperFor(aClass.getHandle().getAddressAt(klassOffset));
66 }
67
68 /** get oop_size field at offset oop_size_offset from a java.lang.Class object */
69 public static long getOopSize(Oop aClass) {
70 return java_lang_Class.oopSizeField.getValue(aClass);
71 }
72 }
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1 /*
2 * Copyright (c) 2011, 2017, 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 *
24
25 package sun.jvm.hotspot.oops;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.memory.*;
31 import sun.jvm.hotspot.runtime.*;
32 import sun.jvm.hotspot.types.AddressField;
33 import sun.jvm.hotspot.types.Type;
34 import sun.jvm.hotspot.types.TypeDataBase;
35 import sun.jvm.hotspot.utilities.*;
36
37 /** A utility class encapsulating useful oop operations */
38
39 // initialize fields for java.lang.Class
40 public class java_lang_Class {
41
42 // java.lang.Class fields
43 static int klassOffset;
44 static int arrayKlassOffset;
45 static IntField oopSizeField;
46
47 static {
48 VM.registerVMInitializedObserver(new Observer() {
49 public void update(Observable o, Object data) {
50 initialize(VM.getVM().getTypeDataBase());
51 }
52 });
53 }
54
55 private static synchronized void initialize(TypeDataBase db) {
56 // klass and oop_size are HotSpot magic fields and hence we can't
57 // find them from InstanceKlass for java.lang.Class.
58 Type jlc = db.lookupType("java_lang_Class");
59 klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue();
60 arrayKlassOffset = (int) jlc.getCIntegerField("_array_klass_offset").getValue();
61 int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue();
62 oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true);
63 }
64
65 /** get Klass* field at offset hc_klass_offset from a java.lang.Class object */
66 public static Klass asKlass(Oop aClass) {
67 return (Klass)Metadata.instantiateWrapperFor(aClass.getHandle().getAddressAt(klassOffset));
68 }
69
70 /** get oop_size field at offset oop_size_offset from a java.lang.Class object */
71 public static long getOopSize(Oop aClass) {
72 return java_lang_Class.oopSizeField.getValue(aClass);
73 }
74
75 /**
76 * Returns the Java name for this Java mirror
77 */
78 public static String asExternalName(Oop aClass) {
79 Klass k = java_lang_Class.asKlass(aClass);
80 if (k == null) { // primitive
81 BasicType type = BasicType.T_VOID;
82 ArrayKlass ak = (ArrayKlass)Metadata.instantiateWrapperFor(
83 aClass.getHandle().getAddressAt(arrayKlassOffset));
84 if (ak != null) {
85 type = BasicType.intToBasicType(ak.getElementType());
86 }
87 return type.getName();
88 } else {
89 return k.getName().asString();
90 }
91 }
92
93 }
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