1 /* 2 * Copyright (c) 2005, 2011, 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.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 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 StringTable 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 Type type = db.lookupType("StringTable"); 46 theTableField = type.getAddressField("_the_table"); 47 } 48 49 // Fields 50 private static AddressField theTableField; 51 52 // Accessors 53 public static StringTable getTheTable() { 54 Address tmp = theTableField.getValue(); 55 return (StringTable) VMObjectFactory.newObject(StringTable.class, tmp); 56 } 57 58 public StringTable(Address addr) { 59 super(addr); 60 } 61 62 public interface StringVisitor { 63 public void visit(Instance string); 64 } 65 66 public void stringsDo(StringVisitor visitor) { 67 ObjectHeap oh = VM.getVM().getObjectHeap(); 68 int numBuckets = tableSize(); 69 for (int i = 0; i < numBuckets; i++) { 70 for (HashtableEntry e = (HashtableEntry) bucket(i); e != null; 71 e = (HashtableEntry) e.next()) { 72 Instance s = (Instance)oh.newOop(e.literalValue().addOffsetToAsOopHandle(0)); 73 visitor.visit(s); 74 } 75 } 76 } 77 }