1 /*

     2  * Copyright (c) 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.runtime;

    26 

    27 import java.util.*;

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

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

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

    31 

    32 public class PerfDataPrologue extends VMObject {

    33     private static JIntField  magicField;

    34     private static JByteField byteOrderField;

    35     private static JByteField majorVersionField;

    36     private static JByteField minorVersionField;

    37     private static JByteField accessibleField;

    38     private static JIntField  usedField;

    39     private static JIntField  overflowField;

    40     private static JLongField modTimeStampField;

    41     private static JIntField  entryOffsetField;

    42     private static JIntField  numEntriesField;

    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 synchronized void initialize(TypeDataBase db) {

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

    54         magicField = type.getJIntField("magic");

    55         byteOrderField = type.getJByteField("byte_order");

    56         majorVersionField = type.getJByteField("major_version");

    57         minorVersionField = type.getJByteField("minor_version");

    58         accessibleField = type.getJByteField("accessible");

    59         usedField = type.getJIntField("used");

    60         overflowField = type.getJIntField("overflow");

    61         modTimeStampField = type.getJLongField("mod_time_stamp");

    62         entryOffsetField = type.getJIntField("entry_offset");

    63         numEntriesField = type.getJIntField("num_entries");

    64     }

    65 

    66     public PerfDataPrologue(Address addr) {

    67         super(addr);

    68     }

    69 

    70     // Accessors

    71     public int magic() {

    72         return (int) magicField.getValue(addr);

    73     }

    74 

    75     public byte byteOrder() {

    76         return (byte) byteOrderField.getValue(addr);

    77     }

    78 

    79     public byte majorVersion() {

    80         return (byte) majorVersionField.getValue(addr);

    81     }

    82 

    83     public boolean accessible() {

    84         return ((byte) accessibleField.getValue(addr)) != (byte)0;

    85     }

    86 

    87     public int used() {

    88         return (int) usedField.getValue(addr);

    89     }

    90 

    91     public int overflow() {

    92         return (int) overflowField.getValue(addr);

    93     }

    94 

    95     public long modTimeStamp() {

    96         return (long) modTimeStampField.getValue(addr);

    97     }

    98 

    99     public int entryOffset() {

   100         return (int) entryOffsetField.getValue(addr);

   101     }

   102 

   103     public int numEntries() {

   104         return (int) numEntriesField.getValue(addr);

   105     }

   106 }