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 allocSize = new CIntField(type.getCIntegerField("_alloc_size"), 0); 53 componentMirror = new OopField(type.getOopField("_component_mirror"), 0); 54 javaLangCloneableName = null; 55 javaLangObjectName = null; 56 javaIoSerializableName = null; 57 } 58 59 public ArrayKlass(Address addr) { 60 super(addr); 61 } 62 63 private static CIntField dimension; 64 private static MetadataField higherDimension; 65 private static MetadataField lowerDimension; 66 private static CIntField vtableLen; 67 private static CIntField allocSize; 68 private static OopField componentMirror; 69 70 public Klass getJavaSuper() { 71 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); 72 return sysDict.getObjectKlass(); 73 } 74 75 public long getDimension() { return dimension.getValue(this); } 76 public Klass getHigherDimension() { return (Klass) higherDimension.getValue(this); } 77 public Klass getLowerDimension() { return (Klass) lowerDimension.getValue(this); } 78 public long getVtableLen() { return vtableLen.getValue(this); } 79 public long getAllocSize() { return allocSize.getValue(this); } 80 public Oop getComponentMirror() { return componentMirror.getValue(this); } 81 82 // constant class names - javaLangCloneable, javaIoSerializable, javaLangObject 83 // Initialized lazily to avoid initialization ordering dependencies between ArrayKlass and SymbolTable 84 private static Symbol javaLangCloneableName; 85 private static Symbol javaLangObjectName; 86 private static Symbol javaIoSerializableName; 87 private static Symbol javaLangCloneableName() { 88 if (javaLangCloneableName == null) { 89 javaLangCloneableName = VM.getVM().getSymbolTable().probe("java/lang/Cloneable"); 90 } 91 return javaLangCloneableName; 92 } 93 94 private static Symbol javaLangObjectName() { 95 if (javaLangObjectName == null) { 96 javaLangObjectName = VM.getVM().getSymbolTable().probe("java/lang/Object"); 97 } 98 return javaLangObjectName; 99 } 100 101 private static Symbol javaIoSerializableName() { 102 if (javaIoSerializableName == null) { 103 javaIoSerializableName = VM.getVM().getSymbolTable().probe("java/io/Serializable"); 104 } 105 return javaIoSerializableName; 106 } 107 108 public int getClassStatus() { 109 return JVMDIClassStatus.VERIFIED | JVMDIClassStatus.PREPARED | JVMDIClassStatus.INITIALIZED; 110 } 111 112 public long computeModifierFlags() { 113 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 114 } 115 116 public long getArrayHeaderInBytes() { 117 return Bits.maskBits(getLayoutHelper() >> LH_HEADER_SIZE_SHIFT, 0xFF); 118 } 119 120 public int getLog2ElementSize() { 121 return Bits.maskBits(getLayoutHelper() >> LH_LOG2_ELEMENT_SIZE_SHIFT, 0xFF); 122 } 123 124 public int getElementType() { 125 return Bits.maskBits(getLayoutHelper() >> LH_ELEMENT_TYPE_SHIFT, 0xFF); 126 } 127 128 boolean computeSubtypeOf(Klass k) { 129 // An array is a subtype of Serializable, Clonable, and Object 130 Symbol name = k.getName(); 131 if (name != null && (name.equals(javaIoSerializableName()) || 132 name.equals(javaLangCloneableName()) || 133 name.equals(javaLangObjectName()))) { 134 return true; 135 } else { 136 return false; 137 } 138 } 139 140 public void printValueOn(PrintStream tty) { 141 tty.print("ArrayKlass"); 142 } 143 144 public void iterateFields(MetadataVisitor visitor) { 145 super.iterateFields(visitor); 146 visitor.doCInt(dimension, true); 147 visitor.doMetadata(higherDimension, true); 148 visitor.doMetadata(lowerDimension, true); 149 visitor.doCInt(vtableLen, true); 150 visitor.doCInt(allocSize, true); 151 visitor.doOop(componentMirror, true); 152 } 153 }