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 }