/*
 * Copyright 2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

package sun.jvm.hotspot.runtime.solaris_amd64;

import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
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.*;

public class SolarisAMD64JavaThreadPDAccess implements JavaThreadPDAccess {
    private static AddressField lastJavaFPField;
    private static AddressField osThreadField;
    private static AddressField baseOfStackPointerField;

    // Field from OSThread
    private static CIntegerField osThreadThreadIDField;

    // 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");
        osThreadThreadIDField   = type.getCIntegerField("_thread_id");
    }

    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 ) {
            return new AMD64Frame(thread.getLastJavaSP(), fp, pc);
        } else {
            return new AMD64Frame(thread.getLastJavaSP(), fp);
        }
    }

    public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
        return new AMD64RegisterMap(thread, 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) {
            return new AMD64Frame(guesser.getSP(), guesser.getFP());
        } else {
            return new AMD64Frame(guesser.getSP(), guesser.getFP(), guesser.getPC());
        }
    }


    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) {
        // 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 thread ID from the OSThread
        Address tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());

        JVMDebugger debugger = VM.getVM().getDebugger();
        return debugger.getThreadForIdentifierAddress(tidAddr);
    }

}
