1 /*
2 * Copyright (c) 2000, 2012, 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.utilities.*;
30 import sun.jvm.hotspot.debugger.*;
31 import sun.jvm.hotspot.memory.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.types.*;
34
35 // ArrayKlass is the abstract class for all array classes
36
37 public class ArrayKlass extends Klass {
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 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("ArrayKlass");
48 dimension = new CIntField(type.getCIntegerField("_dimension"), 0);
49 higherDimension = new MetadataField(type.getAddressField("_higher_dimension"), 0);
50 lowerDimension = new MetadataField(type.getAddressField("_lower_dimension"), 0);
51 vtableLen = new CIntField(type.getCIntegerField("_vtable_len"), 0);
52 componentMirror = new OopField(type.getOopField("_component_mirror"), 0);
53 javaLangCloneableName = null;
54 javaLangObjectName = null;
55 javaIoSerializableName = null;
56 }
57
58 public ArrayKlass(Address addr) {
59 super(addr);
60 }
61
62 private static CIntField dimension;
63 private static MetadataField higherDimension;
64 private static MetadataField lowerDimension;
65 private static CIntField vtableLen;
66 private static OopField componentMirror;
67
68 public Klass getJavaSuper() {
69 SystemDictionary sysDict = VM.getVM().getSystemDictionary();
70 return sysDict.getObjectKlass();
71 }
72
73 public long getDimension() { return dimension.getValue(this); }
74 public Klass getHigherDimension() { return (Klass) higherDimension.getValue(this); }
75 public Klass getLowerDimension() { return (Klass) lowerDimension.getValue(this); }
76 public long getVtableLen() { return vtableLen.getValue(this); }
77 public Oop getComponentMirror() { return componentMirror.getValue(this); }
78
79 // constant class names - javaLangCloneable, javaIoSerializable, javaLangObject
80 // Initialized lazily to avoid initialization ordering dependencies between ArrayKlass and SymbolTable
81 private static Symbol javaLangCloneableName;
82 private static Symbol javaLangObjectName;
83 private static Symbol javaIoSerializableName;
84 private static Symbol javaLangCloneableName() {
85 if (javaLangCloneableName == null) {
86 javaLangCloneableName = VM.getVM().getSymbolTable().probe("java/lang/Cloneable");
87 }
88 return javaLangCloneableName;
89 }
90
91 private static Symbol javaLangObjectName() {
92 if (javaLangObjectName == null) {
93 javaLangObjectName = VM.getVM().getSymbolTable().probe("java/lang/Object");
94 }
95 return javaLangObjectName;
96 }
97
98 private static Symbol javaIoSerializableName() {
99 if (javaIoSerializableName == null) {
100 javaIoSerializableName = VM.getVM().getSymbolTable().probe("java/io/Serializable");
101 }
102 return javaIoSerializableName;
103 }
104
105 public int getClassStatus() {
106 return JVMDIClassStatus.VERIFIED | JVMDIClassStatus.PREPARED | JVMDIClassStatus.INITIALIZED;
107 }
108
109 public long computeModifierFlags() {
110 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
111 }
112
113 public long getArrayHeaderInBytes() {
114 return Bits.maskBits(getLayoutHelper() >> LH_HEADER_SIZE_SHIFT, 0xFF);
115 }
116
117 public int getLog2ElementSize() {
118 return Bits.maskBits(getLayoutHelper() >> LH_LOG2_ELEMENT_SIZE_SHIFT, 0xFF);
119 }
120
121 public int getElementType() {
122 return Bits.maskBits(getLayoutHelper() >> LH_ELEMENT_TYPE_SHIFT, 0xFF);
123 }
124
125 boolean computeSubtypeOf(Klass k) {
126 // An array is a subtype of Serializable, Clonable, and Object
127 Symbol name = k.getName();
128 if (name != null && (name.equals(javaIoSerializableName()) ||
129 name.equals(javaLangCloneableName()) ||
130 name.equals(javaLangObjectName()))) {
131 return true;
132 } else {
133 return false;
134 }
135 }
136
137 public void printValueOn(PrintStream tty) {
138 tty.print("ArrayKlass");
139 }
140
141 public void iterateFields(MetadataVisitor visitor) {
142 super.iterateFields(visitor);
143 visitor.doCInt(dimension, true);
144 visitor.doMetadata(higherDimension, true);
145 visitor.doMetadata(lowerDimension, true);
146 visitor.doCInt(vtableLen, true);
147 visitor.doOop(componentMirror, true);
148 }
149 }