1 /*

     2  * Copyright (c) 2011, 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.x86;

    26 

    27 import java.util.*;

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

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

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

    31 

    32 public class X86RicochetFrame extends VMObject {

    33   static {

    34     VM.registerVMInitializedObserver(new Observer() {

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

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

    37         }

    38       });

    39   }

    40 

    41   private static void initialize(TypeDataBase db) {

    42     Type type = db.lookupType("MethodHandles::RicochetFrame");

    43 

    44     senderLinkField    = type.getAddressField("_sender_link");

    45     savedArgsBaseField = type.getAddressField("_saved_args_base");

    46     exactSenderSPField = type.getAddressField("_exact_sender_sp");

    47     senderPCField      = type.getAddressField("_sender_pc");

    48   }

    49 

    50   private static AddressField senderLinkField;

    51   private static AddressField savedArgsBaseField;

    52   private static AddressField exactSenderSPField;

    53   private static AddressField senderPCField;

    54 

    55   static X86RicochetFrame fromFrame(X86Frame f) {

    56     return new X86RicochetFrame(f.getFP().addOffsetTo(- senderLinkField.getOffset()));

    57   }

    58 

    59   private X86RicochetFrame(Address addr) {

    60     super(addr);

    61   }

    62 

    63   public Address senderLink() {

    64     return senderLinkField.getValue(addr);

    65   }

    66   public Address senderLinkAddress() {

    67     return addr.addOffsetTo(senderLinkField.getOffset());

    68   }

    69   public Address savedArgsBase() {

    70     return savedArgsBaseField.getValue(addr);

    71   }

    72   public Address extendedSenderSP() {

    73     return savedArgsBase();

    74   }

    75   public Address exactSenderSP() {

    76     return exactSenderSPField.getValue(addr);

    77   }

    78   public Address senderPC() {

    79     return senderPCField.getValue(addr);

    80   }

    81 }