/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

package sun.jvm.hotspot.runtime.x86;

import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;

public class X86RicochetFrame extends VMObject {
  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static void initialize(TypeDataBase db) {
    Type type = db.lookupType("MethodHandles::RicochetFrame");

    senderLinkField    = type.getAddressField("_sender_link");
    savedArgsBaseField = type.getAddressField("_saved_args_base");
    exactSenderSPField = type.getAddressField("_exact_sender_sp");
    senderPCField      = type.getAddressField("_sender_pc");
  }

  private static AddressField senderLinkField;
  private static AddressField savedArgsBaseField;
  private static AddressField exactSenderSPField;
  private static AddressField senderPCField;

  static X86RicochetFrame fromFrame(X86Frame f) {
    return new X86RicochetFrame(f.getFP().addOffsetTo(- senderLinkField.getOffset()));
  }

  private X86RicochetFrame(Address addr) {
    super(addr);
  }

  public Address senderLink() {
    return senderLinkField.getValue(addr);
  }
  public Address senderLinkAddress() {
    return addr.addOffsetTo(senderLinkField.getOffset());
  }
  public Address savedArgsBase() {
    return savedArgsBaseField.getValue(addr);
  }
  public Address extendedSenderSP() {
    return savedArgsBase();
  }
  public Address exactSenderSP() {
    return exactSenderSPField.getValue(addr);
  }
  public Address senderPC() {
    return senderPCField.getValue(addr);
  }
}
