/*

 * Copyright (c) 2011, 2012, 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.

 *

 *

 */

package sun.jvm.hotspot.opto;

import java.io.PrintStream;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.ci.*;

import sun.jvm.hotspot.types.*;

public class JVMState extends VMObject {

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

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

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {

    Type type      = db.lookupType("JVMState");

    mapField = type.getAddressField("_map");

    methodField = type.getAddressField("_method");

    bciField = new CIntField(type.getCIntegerField("_bci"), 0);

    spField = new CIntField(type.getCIntegerField("_sp"), 0);

    endoffField = new CIntField(type.getCIntegerField("_endoff"), 0);

    try {

        scloffField = new CIntField(type.getCIntegerField("_scloff"), 0);

    } catch (Exception e) {

    }

    monoffField = new CIntField(type.getCIntegerField("_monoff"), 0);

    stkoffField = new CIntField(type.getCIntegerField("_stkoff"), 0);

    locoffField = new CIntField(type.getCIntegerField("_locoff"), 0);

    depthField = new CIntField(type.getCIntegerField("_depth"), 0);

    callerField = type.getAddressField("_caller");

  }

  private static AddressField mapField;

  private static AddressField methodField;

  private static CIntField bciField;

  private static CIntField spField;

  private static CIntField endoffField;

  private static CIntField scloffField;

  private static CIntField monoffField;

  private static CIntField stkoffField;

  private static CIntField locoffField;

  private static CIntField depthField;

  private static AddressField callerField;

  public static JVMState create(Address addr) {

    if (addr == null) return null;

    return new JVMState(addr);

  }

  public JVMState(Address addr) {

    super(addr);

  }

  public ciMethod method() {

    return (ciMethod) ciObjectFactory.getMetadata(methodField.getValue(getAddress()));

  }

  public int bci() {

    return (int)bciField.getValue(getAddress());

  }

  public JVMState caller() {

    return create(callerField.getValue(getAddress()));

  }

  public void dumpSpec(PrintStream out) {

    ciMethod m = method();

    if (m != null) {

      Method meth = m.method();

      out.print(" " + meth.getMethodHolder().getName().asString().replace('/', '.') + "::" +

                meth.getName().asString() + " @ bci:" + bci());

    } else {

      out.print(" runtime stub");

    }

    if (caller() != null)  caller().dumpSpec(out);

  }

}