1 /*

     2  * Copyright (c) 2000, 2004, 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.compiler;

    26 

    27 import java.util.*;

    28 

    29 import sun.jvm.hotspot.code.*;

    30 import sun.jvm.hotspot.debugger.*;

    31 import sun.jvm.hotspot.runtime.*;

    32 import sun.jvm.hotspot.types.*;

    33 

    34 public class OopMap extends VMObject {

    35   private static CIntegerField pcOffsetField;

    36   private static CIntegerField omvCountField;

    37   private static CIntegerField omvDataSizeField;

    38   private static AddressField  omvDataField;

    39   private static AddressField  compressedWriteStreamField;

    40 

    41   // This is actually a field inside class CompressedStream

    42   private static AddressField  compressedStreamBufferField;

    43 

    44   static {

    45     VM.registerVMInitializedObserver(new Observer() {

    46         public void update(Observable o, Object data) {

    47           initialize(VM.getVM().getTypeDataBase());

    48         }

    49       });

    50   }

    51 

    52   private static void initialize(TypeDataBase db) {

    53     Type type = db.lookupType("OopMap");

    54 

    55     pcOffsetField              = type.getCIntegerField("_pc_offset");

    56     omvCountField              = type.getCIntegerField("_omv_count");

    57     omvDataSizeField           = type.getCIntegerField("_omv_data_size");

    58     omvDataField               = type.getAddressField("_omv_data");

    59     compressedWriteStreamField = type.getAddressField("_write_stream");

    60 

    61     type = db.lookupType("CompressedStream");

    62     compressedStreamBufferField = type.getAddressField("_buffer");

    63   }

    64 

    65   public OopMap(Address addr) {

    66     super(addr);

    67   }

    68 

    69   public long getOffset() {

    70     return pcOffsetField.getValue(addr);

    71   }

    72 

    73   //--------------------------------------------------------------------------------

    74   // Internals only below this point

    75   //

    76 

    77   // Accessors -- package private for now

    78   Address getOMVData() {

    79     return omvDataField.getValue(addr);

    80   }

    81 

    82   long getOMVDataSize() {

    83     return omvDataSizeField.getValue(addr);

    84   }

    85 

    86   long getOMVCount() {

    87     return omvCountField.getValue(addr);

    88   }

    89 

    90   CompressedWriteStream getWriteStream() {

    91     Address wsAddr = compressedWriteStreamField.getValue(addr);

    92     if (wsAddr == null) {

    93       return null;

    94     }

    95     Address bufferAddr = compressedStreamBufferField.getValue(wsAddr);

    96     if (bufferAddr == null) {

    97       return null;

    98     }

    99     return new CompressedWriteStream(bufferAddr);

   100   }

   101 }