View Javadoc
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 }