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 }