/*

 * Copyright (c) 2005, 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.win32_amd64;

import java.io.*;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.debugger.win32.*;

import sun.jvm.hotspot.debugger.amd64.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.runtime.amd64.*;

import sun.jvm.hotspot.types.*;

import sun.jvm.hotspot.utilities.*;

/** This class is only public to allow using the VMObjectFactory to

    instantiate these.

*/

public class Win32AMD64JavaThreadPDAccess implements JavaThreadPDAccess {

  private static AddressField  lastJavaFPField;

  private static AddressField  osThreadField;

  // Field from OSThread

  private static Field         osThreadThreadHandleField;

  // This is currently unneeded but is being kept in case we change

  // the currentFrameGuess algorithm

  private static final long GUESS_SCAN_RANGE = 128 * 1024;

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

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

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) {

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

    Type anchorType = db.lookupType("JavaFrameAnchor");

    lastJavaFPField         = anchorType.getAddressField("_last_Java_fp");

    osThreadField           = type.getAddressField("_osthread");

    type = db.lookupType("OSThread");

    osThreadThreadHandleField = type.getField("_thread_handle");

  }

  public Address getLastJavaFP(Address addr) {

    return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset()));

  }

  public Address getLastJavaPC(Address addr) {

    return null;

  }

  public Address getBaseOfStackPointer(Address addr) {

    return null;

  }

  public Frame getLastFramePD(JavaThread thread, Address addr) {

    Address fp = thread.getLastJavaFP();

    if (fp == null) {

      return null; // no information

    }

    Address pc =  thread.getLastJavaPC();

    if ( pc != null ) {

    } else {

    }

  }

  public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {

  }

  public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {

    ThreadProxy t = getThreadProxy(addr);

    AMD64ThreadContext context = (AMD64ThreadContext) t.getContext();

    AMD64CurrentFrameGuess guesser = new AMD64CurrentFrameGuess(context, thread);

    if (!guesser.run(GUESS_SCAN_RANGE)) {

      return null;

    }

    if (guesser.getPC() == null) {

    } else {

    }

  }

  public void printThreadIDOn(Address addr, PrintStream tty) {

    tty.print(getThreadProxy(addr));

  }

  public void printInfoOn(Address threadAddr, PrintStream tty) {

  }

  public Address getLastSP(Address addr) {

    ThreadProxy t = getThreadProxy(addr);

    AMD64ThreadContext context = (AMD64ThreadContext) t.getContext();

    return context.getRegisterAsAddress(AMD64ThreadContext.RSP);

  }

  public ThreadProxy getThreadProxy(Address addr) {

    // Addr is the address of the JavaThread.

    // Fetch the OSThread (for now and for simplicity, not making a

    // separate "OSThread" class in this package)

    Address osThreadAddr = osThreadField.getValue(addr);

    // Get the address of the HANDLE within the OSThread

    Address threadHandleAddr =

      osThreadAddr.addOffsetTo(osThreadThreadHandleField.getOffset());

    JVMDebugger debugger = VM.getVM().getDebugger();

    return debugger.getThreadForIdentifierAddress(threadHandleAddr);

  }

}