1 /* 2 * Copyright (c) 2003, 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.memory; 26 27 import java.util.*; 28 import sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.oops.*; 30 import sun.jvm.hotspot.types.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.utilities.*; 33 34 public class Dictionary extends TwoOopHashtable { 35 static { 36 VM.registerVMInitializedObserver(new Observer() { 37 public void update(Observable o, Object data) { 38 initialize(VM.getVM().getTypeDataBase()); 39 } 40 }); 41 } 42 43 private static synchronized void initialize(TypeDataBase db) { 44 // just checking that the type exists 45 Type type = db.lookupType("Dictionary"); 46 } 47 48 public Dictionary(Address addr) { 49 super(addr); 50 } 51 52 // this is overriden here so that Hashtable.bucket will return 53 // object of DictionaryEntry.class 54 protected Class getHashtableEntryClass() { 55 return DictionaryEntry.class; 56 } 57 58 /** Iterate over all klasses in dictionary; just the classes from 59 declaring class loaders */ 60 public void classesDo(SystemDictionary.ClassVisitor v) { 61 ObjectHeap heap = VM.getVM().getObjectHeap(); 62 int tblSize = tableSize(); 63 for (int index = 0; index < tblSize; index++) { 64 for (DictionaryEntry probe = (DictionaryEntry) bucket(index); probe != null; 65 probe = (DictionaryEntry) probe.next()) { 66 Klass k = probe.klass(); 67 if (heap.equal(probe.loader(), ((InstanceKlass) k).getClassLoader())) { 68 v.visit(k); 69 } 70 } 71 } 72 } 73 74 /** All classes, and their class loaders */ 75 public void classesDo(SystemDictionary.ClassAndLoaderVisitor v) { 76 int tblSize = tableSize(); 77 for (int index = 0; index < tblSize; index++) { 78 for (DictionaryEntry probe = (DictionaryEntry) bucket(index); probe != null; 79 probe = (DictionaryEntry) probe.next()) { 80 Klass k = probe.klass(); 81 v.visit(k, probe.loader()); 82 } 83 } 84 } 85 86 public Klass find(int index, long hash, Symbol className, Oop classLoader, Oop protectionDomain) { 87 DictionaryEntry entry = getEntry(index, hash, className, classLoader); 88 if (entry != null && entry.isValidProtectionDomain(protectionDomain)) { 89 return entry.klass(); 90 } 91 return null; 92 } 93 94 // - Internals only below this point 95 96 private DictionaryEntry getEntry(int index, long hash, Symbol className, Oop classLoader) { 97 for (DictionaryEntry entry = (DictionaryEntry) bucket(index); entry != null; 98 entry = (DictionaryEntry) entry.next()) { 99 if (entry.hash() == hash && entry.equals(className, classLoader)) { 100 return entry; 101 } 102 } 103 return null; 104 } 105 106 public boolean contains(Klass c, Oop classLoader) { 107 long hash = computeHash(c.getName(), classLoader); 108 int index = hashToIndex(hash); 109 110 for (DictionaryEntry entry = (DictionaryEntry) bucket(index); entry != null; 111 entry = (DictionaryEntry) entry.next()) { 112 if (entry.literalValue().equals(c.getAddress())) { 113 return true; 114 } 115 } 116 return false; 117 } 118 }