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 }