/*

 * Copyright 2001-2007 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.

 *

 */

#include "incls/_precompiled.incl"

#include "incls/_g1SATBCardTableModRefBS.cpp.incl"

G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,

                                                 int max_covered_regions) :

    CardTableModRefBSForCTRS(whole_heap, max_covered_regions)

{

  _kind = G1SATBCT;

}

void G1SATBCardTableModRefBS::enqueue(oop pre_val) {

  if (!JavaThread::satb_mark_queue_set().active()) return;

  Thread* thr = Thread::current();

  if (thr->is_Java_thread()) {

    JavaThread* jt = (JavaThread*)thr;

    jt->satb_mark_queue().enqueue(pre_val);

  } else {

    MutexLocker x(Shared_SATB_Q_lock);

    JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);

  }

}

// When we know the current java thread:

void

G1SATBCardTableModRefBS::write_ref_field_pre_static(void* field,

                                                    oop newVal,

                                                    JavaThread* jt) {

  if (!JavaThread::satb_mark_queue_set().active()) return;

  assert(!UseCompressedOops, "Else will need to modify this to deal with narrowOop");

  oop preVal = *(oop*)field;

  if (preVal != NULL) {

    jt->satb_mark_queue().enqueue(preVal);

  }

}

void

G1SATBCardTableModRefBS::write_ref_array_pre(MemRegion mr) {

  if (!JavaThread::satb_mark_queue_set().active()) return;

  assert(!UseCompressedOops, "Else will need to modify this to deal with narrowOop");

  oop* elem_ptr = (oop*)mr.start();

  while ((HeapWord*)elem_ptr < mr.end()) {

    oop elem = *elem_ptr;

    if (elem != NULL) enqueue(elem);

    elem_ptr++;

  }

}

G1SATBCardTableLoggingModRefBS::

G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,

                               int max_covered_regions) :

  G1SATBCardTableModRefBS(whole_heap, max_covered_regions),

  _dcqs(JavaThread::dirty_card_queue_set())

{

  _kind = G1SATBCTLogging;

}

void

G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,

                                                     oop new_val) {

  jbyte* byte = byte_for(field);

  if (*byte != dirty_card) {

    *byte = dirty_card;

    Thread* thr = Thread::current();

    if (thr->is_Java_thread()) {

      JavaThread* jt = (JavaThread*)thr;

      jt->dirty_card_queue().enqueue(byte);

    } else {

      MutexLockerEx x(Shared_DirtyCardQ_lock,

                      Mutex::_no_safepoint_check_flag);

      _dcqs.shared_dirty_card_queue()->enqueue(byte);

    }

  }

}

void

G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,

                                                       oop new_val) {

  uintptr_t field_uint = (uintptr_t)field;

  uintptr_t new_val_uint = (uintptr_t)new_val;

  uintptr_t comb = field_uint ^ new_val_uint;

  comb = comb >> HeapRegion::LogOfHRGrainBytes;

  if (comb == 0) return;

  if (new_val == NULL) return;

  // Otherwise, log it.

  G1SATBCardTableLoggingModRefBS* g1_bs =

    (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();

  g1_bs->write_ref_field_work(field, new_val);

}

void

G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {

  jbyte* byte = byte_for(mr.start());

  jbyte* last_byte = byte_for(mr.last());

  Thread* thr = Thread::current();

  if (whole_heap) {

    while (byte <= last_byte) {

      *byte = dirty_card;

      byte++;

    }

  } else {

    // Enqueue if necessary.

    if (thr->is_Java_thread()) {

      JavaThread* jt = (JavaThread*)thr;

      while (byte <= last_byte) {

        if (*byte != dirty_card) {

          *byte = dirty_card;

          jt->dirty_card_queue().enqueue(byte);

        }

        byte++;

      }

    } else {

      MutexLockerEx x(Shared_DirtyCardQ_lock,

                      Mutex::_no_safepoint_check_flag);

      while (byte <= last_byte) {

        if (*byte != dirty_card) {

          *byte = dirty_card;

          _dcqs.shared_dirty_card_queue()->enqueue(byte);

        }

        byte++;

      }

    }

  }

}