Mercurial > hg > graal-compiler
annotate agent/src/share/classes/sun/jvm/hotspot/memory/SystemDictionary.java @ 132:60b728ec77c1
6652736: well known classes in system dictionary are inefficiently processed
Summary: combine many scalar variables into a single enum-indexed array in SystemDictionary.
Reviewed-by: kvn
| author | jrose |
|---|---|
| date | Tue, 29 Apr 2008 19:45:22 -0700 |
| parents | a61af66fc99e |
| children | 83c868b757c0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2001-2005 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.memory; | |
| 26 | |
| 27 import java.util.*; | |
| 28 import sun.jvm.hotspot.debugger.*; | |
| 29 import sun.jvm.hotspot.oops.*; | |
| 30 import sun.jvm.hotspot.runtime.*; | |
| 31 import sun.jvm.hotspot.types.*; | |
|
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32 import sun.jvm.hotspot.types.OopField; // resolve ambiguity with oops.OopField |
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33 |
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34 // following needed for on-the-fly field construction: |
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35 import sun.jvm.hotspot.types.basic.BasicOopField; |
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36 import sun.jvm.hotspot.types.basic.BasicTypeDataBase; |
| 0 | 37 |
| 38 public class SystemDictionary { | |
| 39 private static AddressField dictionaryField; | |
| 40 private static AddressField sharedDictionaryField; | |
| 41 private static AddressField placeholdersField; | |
| 42 private static AddressField loaderConstraintTableField; | |
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43 private static OopField javaSystemLoaderField; |
| 0 | 44 private static int nofBuckets; |
| 45 | |
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46 private static OopField wellKnownKlasses; |
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47 private static OopField objectKlassField; |
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48 private static OopField classLoaderKlassField; |
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49 private static OopField stringKlassField; |
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50 private static OopField systemKlassField; |
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51 private static OopField threadKlassField; |
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52 private static OopField threadGroupKlassField; |
| 0 | 53 |
| 54 static { | |
| 55 VM.registerVMInitializedObserver(new Observer() { | |
| 56 public void update(Observable o, Object data) { | |
| 57 initialize(VM.getVM().getTypeDataBase()); | |
| 58 } | |
| 59 }); | |
| 60 } | |
| 61 | |
| 62 private static synchronized void initialize(TypeDataBase db) { | |
| 63 Type type = db.lookupType("SystemDictionary"); | |
| 64 | |
| 65 dictionaryField = type.getAddressField("_dictionary"); | |
| 66 sharedDictionaryField = type.getAddressField("_shared_dictionary"); | |
| 67 placeholdersField = type.getAddressField("_placeholders"); | |
| 68 loaderConstraintTableField = type.getAddressField("_loader_constraints"); | |
| 69 javaSystemLoaderField = type.getOopField("_java_system_loader"); | |
| 70 nofBuckets = db.lookupIntConstant("SystemDictionary::_nof_buckets").intValue(); | |
| 71 | |
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72 wellKnownKlasses = type.getOopField("_well_known_klasses[0]"); |
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73 objectKlassField = findWellKnownKlass("object_klass", type, db); |
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74 classLoaderKlassField = findWellKnownKlass("classloader_klass", type, db); |
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75 stringKlassField = findWellKnownKlass("string_klass", type, db); |
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76 systemKlassField = findWellKnownKlass("system_klass", type, db); |
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77 threadKlassField = findWellKnownKlass("thread_klass", type, db); |
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78 threadGroupKlassField = findWellKnownKlass("threadGroup_klass", type, db); |
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79 } |
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80 |
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81 private static OopField findWellKnownKlass(String indexName, Type type, TypeDataBase db) { |
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82 Address wkk = wellKnownKlasses.getStaticFieldAddress(); |
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83 int index = db.lookupIntConstant("SystemDictionary::#"+indexName).intValue(); |
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84 return new BasicOopField((BasicTypeDataBase)db, type, indexName, type, |
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85 true, index * db.getAddressSize(), wkk); |
| 0 | 86 } |
| 87 | |
| 88 public Dictionary dictionary() { | |
| 89 Address tmp = dictionaryField.getValue(); | |
| 90 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); | |
| 91 } | |
| 92 | |
| 93 public Dictionary sharedDictionary() { | |
| 94 Address tmp = sharedDictionaryField.getValue(); | |
| 95 return (Dictionary) VMObjectFactory.newObject(Dictionary.class, tmp); | |
| 96 } | |
| 97 | |
| 98 public PlaceholderTable placeholders() { | |
| 99 Address tmp = placeholdersField.getValue(); | |
| 100 return (PlaceholderTable) VMObjectFactory.newObject(PlaceholderTable.class, tmp); | |
| 101 } | |
| 102 | |
| 103 public LoaderConstraintTable constraints() { | |
| 104 Address tmp = placeholdersField.getValue(); | |
| 105 return (LoaderConstraintTable) VMObjectFactory.newObject(LoaderConstraintTable.class, tmp); | |
| 106 } | |
| 107 | |
| 108 // few well known classes -- not all are added here. | |
| 109 // add more if needed. | |
| 110 public static InstanceKlass getThreadKlass() { | |
| 111 return (InstanceKlass) newOop(threadKlassField.getValue()); | |
| 112 } | |
| 113 | |
| 114 public static InstanceKlass getThreadGroupKlass() { | |
| 115 return (InstanceKlass) newOop(threadGroupKlassField.getValue()); | |
| 116 } | |
| 117 | |
| 118 public static InstanceKlass getObjectKlass() { | |
| 119 return (InstanceKlass) newOop(objectKlassField.getValue()); | |
| 120 } | |
| 121 | |
| 122 public static InstanceKlass getStringKlass() { | |
| 123 return (InstanceKlass) newOop(stringKlassField.getValue()); | |
| 124 } | |
| 125 | |
| 126 public static InstanceKlass getClassLoaderKlass() { | |
| 127 return (InstanceKlass) newOop(classLoaderKlassField.getValue()); | |
| 128 } | |
| 129 | |
| 130 public static InstanceKlass getSystemKlass() { | |
| 131 return (InstanceKlass) newOop(systemKlassField.getValue()); | |
| 132 } | |
| 133 | |
| 134 public InstanceKlass getAbstractOwnableSynchronizerKlass() { | |
| 135 return (InstanceKlass) find("java/util/concurrent/locks/AbstractOwnableSynchronizer", | |
| 136 null, null); | |
| 137 } | |
| 138 | |
| 139 public static Oop javaSystemLoader() { | |
| 140 return newOop(javaSystemLoaderField.getValue()); | |
| 141 } | |
| 142 | |
| 143 public static int getNumOfBuckets() { | |
| 144 return nofBuckets; | |
| 145 } | |
| 146 | |
| 147 private static Oop newOop(OopHandle handle) { | |
| 148 return VM.getVM().getObjectHeap().newOop(handle); | |
| 149 } | |
| 150 | |
| 151 /** Lookup an already loaded class. If not found null is returned. */ | |
| 152 public Klass find(String className, Oop classLoader, Oop protectionDomain) { | |
| 153 Symbol sym = VM.getVM().getSymbolTable().probe(className); | |
| 154 if (sym == null) return null; | |
| 155 return find(sym, classLoader, protectionDomain); | |
| 156 } | |
| 157 | |
| 158 /** Lookup an already loaded class. If not found null is returned. */ | |
| 159 public Klass find(Symbol className, Oop classLoader, Oop protectionDomain) { | |
| 160 Dictionary dict = dictionary(); | |
| 161 long hash = dict.computeHash(className, classLoader); | |
| 162 int index = dict.hashToIndex(hash); | |
| 163 return dict.find(index, hash, className, classLoader, protectionDomain); | |
| 164 } | |
| 165 | |
| 166 /** Interface for iterating through all classes in dictionary */ | |
| 167 public static interface ClassVisitor { | |
| 168 public void visit(Klass k); | |
| 169 } | |
| 170 | |
| 171 /** Interface for iterating through all classes and their class | |
| 172 loaders in dictionary */ | |
| 173 public static interface ClassAndLoaderVisitor { | |
| 174 public void visit(Klass k, Oop loader); | |
| 175 } | |
| 176 | |
| 177 /** Iterate over all klasses - including object, primitive | |
| 178 array klasses */ | |
| 179 public void allClassesDo(final ClassVisitor v) { | |
| 180 ClassVisitor visitor = new ClassVisitor() { | |
| 181 public void visit(Klass k) { | |
| 182 for (Klass l = k; l != null; l = l.arrayKlassOrNull()) { | |
| 183 v.visit(l); | |
| 184 } | |
| 185 } | |
| 186 }; | |
| 187 classesDo(visitor); | |
| 188 VM.getVM().getUniverse().basicTypeClassesDo(visitor); | |
| 189 } | |
| 190 | |
| 191 /** Iterate over all klasses in dictionary; just the classes from | |
| 192 declaring class loaders */ | |
| 193 public void classesDo(ClassVisitor v) { | |
| 194 dictionary().classesDo(v); | |
| 195 } | |
| 196 | |
| 197 /** All classes, and their class loaders */ | |
| 198 public void classesDo(ClassAndLoaderVisitor v) { | |
| 199 dictionary().classesDo(v); | |
| 200 } | |
| 201 | |
| 202 /** All array classes of primitive type, and their class loaders */ | |
| 203 public void primArrayClassesDo(ClassAndLoaderVisitor v) { | |
| 204 placeholders().primArrayClassesDo(v); | |
| 205 } | |
| 206 } |