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comparison agent/src/share/classes/sun/jvm/hotspot/oops/ObjArrayKlass.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.oops;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 // ObjArrayKlass is the klass for ObjArrays
35
36 public class ObjArrayKlass extends ArrayKlass {
37 static {
38 VM.registerVMInitializedObserver(new Observer() {
39 public void update(Observable o, Object data) {
40 initialize(VM.getVM().getTypeDataBase());
41 }
42 });
43 }
44
45 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
46 Type type = db.lookupType("objArrayKlass");
47 elementKlass = new OopField(type.getOopField("_element_klass"), Oop.getHeaderSize());
48 bottomKlass = new OopField(type.getOopField("_bottom_klass"), Oop.getHeaderSize());
49 }
50
51 ObjArrayKlass(OopHandle handle, ObjectHeap heap) {
52 super(handle, heap);
53 }
54
55 private static OopField elementKlass;
56 private static OopField bottomKlass;
57
58 public Klass getElementKlass() { return (Klass) elementKlass.getValue(this); }
59 public Klass getBottomKlass() { return (Klass) bottomKlass.getValue(this); }
60
61 public long computeModifierFlags() {
62 long elementFlags = getElementKlass().computeModifierFlags();
63 long arrayFlags = 0L;
64 if ((elementFlags & (JVM_ACC_PUBLIC | JVM_ACC_PROTECTED)) != 0) {
65 // The array type is public if the component type is public or protected
66 arrayFlags = JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
67 } else {
68 // The array type is private if the component type is private
69 arrayFlags = JVM_ACC_ABSTRACT | JVM_ACC_FINAL;
70 }
71 return arrayFlags;
72 }
73
74 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
75 super.iterateFields(visitor, doVMFields);
76 if (doVMFields) {
77 visitor.doOop(elementKlass, true);
78 visitor.doOop(bottomKlass, true);
79 }
80 }
81
82 public Klass arrayKlassImpl(boolean orNull, int n) {
83 if (Assert.ASSERTS_ENABLED) {
84 Assert.that(getDimension() <= n, "check order of chain");
85 }
86 int dimension = (int) getDimension();
87 if (dimension == n) {
88 return this;
89 }
90 ObjArrayKlass ak = (ObjArrayKlass) getHigherDimension();
91 if (ak == null) {
92 if (orNull) return null;
93 // FIXME: would need to change in reflective system to actually
94 // allocate klass
95 throw new RuntimeException("Can not allocate array klasses in debugging system");
96 }
97
98 if (orNull) {
99 return ak.arrayKlassOrNull(n);
100 }
101 return ak.arrayKlass(n);
102 }
103
104 public Klass arrayKlassImpl(boolean orNull) {
105 return arrayKlassImpl(orNull, (int) (getDimension() + 1));
106 }
107
108 public void printValueOn(PrintStream tty) {
109 tty.print("ObjArrayKlass for ");
110 getElementKlass().printValueOn(tty);
111 }
112 };