Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/ArrayKlass.java @ 6725:da91efe96a93
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 | c18cbe5936b8 |
| children | d8ce2825b193 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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"); | |
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48 dimension = new CIntField(type.getCIntegerField("_dimension"), 0); |
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49 higherDimension = new MetadataField(type.getAddressField("_higher_dimension"), 0); |
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50 lowerDimension = new MetadataField(type.getAddressField("_lower_dimension"), 0); |
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51 vtableLen = new CIntField(type.getCIntegerField("_vtable_len"), 0); |
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52 allocSize = new CIntField(type.getCIntegerField("_alloc_size"), 0); |
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53 componentMirror = new OopField(type.getOopField("_component_mirror"), 0); |
| 0 | 54 javaLangCloneableName = null; |
| 55 javaLangObjectName = null; | |
| 56 javaIoSerializableName = null; | |
| 57 } | |
| 58 | |
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59 public ArrayKlass(Address addr) { |
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60 super(addr); |
| 0 | 61 } |
| 62 | |
| 63 private static CIntField dimension; | |
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64 private static MetadataField higherDimension; |
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65 private static MetadataField lowerDimension; |
| 0 | 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 | |
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6964458: Reimplement class meta-data storage to use native memory
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144 public void iterateFields(MetadataVisitor visitor) { |
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145 super.iterateFields(visitor); |
| 0 | 146 visitor.doCInt(dimension, true); |
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6964458: Reimplement class meta-data storage to use native memory
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147 visitor.doMetadata(higherDimension, true); |
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148 visitor.doMetadata(lowerDimension, true); |
| 0 | 149 visitor.doCInt(vtableLen, true); |
| 150 visitor.doCInt(allocSize, true); | |
| 151 visitor.doOop(componentMirror, true); | |
| 152 } | |
| 153 } |