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.classfile.*; 30 import sun.jvm.hotspot.oops.*; 31 import sun.jvm.hotspot.types.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.utilities.*; 34 35 public class Dictionary extends sun.jvm.hotspot.utilities.Hashtable { 36 static { 37 VM.registerVMInitializedObserver(new Observer() { 38 public void update(Observable o, Object data) { 39 initialize(VM.getVM().getTypeDataBase()); 40 } 41 }); 42 } 43 44 private static synchronized void initialize(TypeDataBase db) { 45 // just checking that the type exists 46 Type type = db.lookupType("Dictionary"); 47 } 48 49 public Dictionary(Address addr) { 50 super(addr); 51 } 52 53 // this is overriden here so that Hashtable.bucket will return 54 // object of DictionaryEntry.class 55 protected Class getHashtableEntryClass() { 56 return DictionaryEntry.class; 57 } 58 59 /** All classes, and their initiating class loader, passed in. */ 60 public void allEntriesDo(ClassLoaderDataGraph.ClassAndLoaderVisitor v, Oop loader) { 61 int tblSize = tableSize(); 62 for (int index = 0; index < tblSize; index++) { 63 for (DictionaryEntry probe = (DictionaryEntry) bucket(index); probe != null; 64 probe = (DictionaryEntry) probe.next()) { 65 Klass k = probe.klass(); 66 v.visit(k, loader); 67 } 68 } 69 } 70 71 // - Internals only below this point 72 73 private DictionaryEntry getEntry(int index, long hash, Symbol className) { 74 for (DictionaryEntry entry = (DictionaryEntry) bucket(index); entry != null; 75 entry = (DictionaryEntry) entry.next()) { 76 if (entry.hash() == hash && entry.equals(className)) { 77 return entry; 78 } 79 } 80 return null; 81 } 82 83 public boolean contains(Klass c) { 84 long hash = computeHash(c.getName()); 85 int index = hashToIndex(hash); 86 87 for (DictionaryEntry entry = (DictionaryEntry) bucket(index); entry != null; 88 entry = (DictionaryEntry) entry.next()) { 89 if (entry.literalValue().equals(c.getAddress())) { 90 return true; 91 } 92 } 93 return false; 94 } 95 }