hotspot/agent/src/share/classes/sun/jvm/hotspot/compiler/ImmutableOopMapPair.java
changeset 30590 14f7f48c1377
child 30630 0c9eb2d41b48
equal deleted inserted replaced
30589:4722e25bfd6d 30590:14f7f48c1377
       
     1 /*
       
     2  * Copyright (c) 2015, 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 sun.jvm.hotspot.debugger.Address;
       
    28 import sun.jvm.hotspot.runtime.VM;
       
    29 import sun.jvm.hotspot.types.CIntegerField;
       
    30 import sun.jvm.hotspot.types.Type;
       
    31 import sun.jvm.hotspot.types.TypeDataBase;
       
    32 
       
    33 import java.util.Observable;
       
    34 import java.util.Observer;
       
    35 
       
    36 public class ImmutableOopMapPair {
       
    37   private static CIntegerField pcField;
       
    38   private static CIntegerField offsetField;
       
    39   private static long classSize;
       
    40 
       
    41   static {
       
    42     VM.registerVMInitializedObserver(new Observer() {
       
    43       public void update(Observable o, Object data) {
       
    44         initialize(VM.getVM().getTypeDataBase());
       
    45       }
       
    46     });
       
    47   }
       
    48 
       
    49   private final Address address;
       
    50 
       
    51   public ImmutableOopMapPair(Address address) {
       
    52     this.address = address;
       
    53   }
       
    54 
       
    55   public static long classSize() {
       
    56     return classSize;
       
    57   }
       
    58 
       
    59   public int getPC() {
       
    60     return (int) pcField.getValue(address);
       
    61   }
       
    62 
       
    63   public int getOffset() {
       
    64     return (int) offsetField.getValue(address);
       
    65   }
       
    66 
       
    67   private static void initialize(TypeDataBase db) {
       
    68     Type type = db.lookupType("ImmutableOopMapSet");
       
    69 
       
    70     pcField = type.getCIntegerField("_pc_offset");
       
    71     offsetField = type.getCIntegerField("_oopmap_offset");
       
    72     classSize = type.getSize();
       
    73   }
       
    74 }