/*

 * Copyright (c) 2001, 2010, 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.

 *

 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP

#define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP

#include "gc_implementation/g1/g1RemSet.hpp"

#include "gc_implementation/g1/heapRegionRemSet.hpp"

#include "oops/oop.inline.hpp"

inline size_t G1RemSet::n_workers() {

  if (_g1->workers() != NULL) {

    return _g1->workers()->total_workers();

  } else {

    return 1;

  }

}

template <class T>

inline void G1RemSet::write_ref(HeapRegion* from, T* p) {

  par_write_ref(from, p, 0);

}

template <class T>

inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {

  oop obj = oopDesc::load_decode_heap_oop(p);

#ifdef ASSERT

  // can't do because of races

  // assert(obj == NULL || obj->is_oop(), "expected an oop");

  // Do the safe subset of is_oop

  if (obj != NULL) {

#ifdef CHECK_UNHANDLED_OOPS

    oopDesc* o = obj.obj();

#else

    oopDesc* o = obj;

#endif // CHECK_UNHANDLED_OOPS

    assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");

    assert(Universe::heap()->is_in_reserved(obj), "must be in heap");

  }

#endif // ASSERT

  assert(from == NULL || from->is_in_reserved(p), "p is not in from");

  HeapRegion* to = _g1->heap_region_containing(obj);

  if (to != NULL && from != to) {

    assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");

    to->rem_set()->add_reference(p, tid);

  }

}

template <class T>

inline void UpdateRSOopClosure::do_oop_work(T* p) {

  assert(_from != NULL, "from region must be non-NULL");

  _rs->par_write_ref(_from, p, _worker_i);

}

template <class T>

inline void UpdateRSetImmediate::do_oop_work(T* p) {

  assert(_from->is_in_reserved(p), "paranoia");

  T heap_oop = oopDesc::load_heap_oop(p);

  if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {

    _g1_rem_set->par_write_ref(_from, p, 0);

  }

}

template <class T>

inline void UpdateRSOrPushRefOopClosure::do_oop_work(T* p) {

  oop obj = oopDesc::load_decode_heap_oop(p);

#ifdef ASSERT

  // can't do because of races

  // assert(obj == NULL || obj->is_oop(), "expected an oop");

  // Do the safe subset of is_oop

  if (obj != NULL) {

#ifdef CHECK_UNHANDLED_OOPS

    oopDesc* o = obj.obj();

#else

    oopDesc* o = obj;

#endif // CHECK_UNHANDLED_OOPS

    assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");

    assert(Universe::heap()->is_in_reserved(obj), "must be in heap");

  }

#endif // ASSERT

  assert(_from != NULL, "from region must be non-NULL");

  HeapRegion* to = _g1->heap_region_containing(obj);

  if (to != NULL && _from != to) {

    // The _record_refs_into_cset flag is true during the RSet

    // updating part of an evacuation pause. It is false at all

    // other times:

    //  * rebuilding the rembered sets after a full GC

    //  * during concurrent refinement.

    //  * updating the remembered sets of regions in the collection

    //    set in the event of an evacuation failure (when deferred

    //    updates are enabled).

    if (_record_refs_into_cset && to->in_collection_set()) {

      // We are recording references that point into the collection

      // set and this particular reference does exactly that...

      // If the referenced object has already been forwarded

      // to itself, we are handling an evacuation failure and

      // we have already visited/tried to copy this object

      // there is no need to retry.

      if (!self_forwarded(obj)) {

        assert(_push_ref_cl != NULL, "should not be null");

        // Push the reference in the refs queue of the G1ParScanThreadState

        // instance for this worker thread.

        _push_ref_cl->do_oop(p);

      }

      // Deferred updates to the CSet are either discarded (in the normal case),

      // or processed (if an evacuation failure occurs) at the end

      // of the collection.

      // See G1RemSet::cleanup_after_oops_into_collection_set_do().

    } else {

      // We either don't care about pushing references that point into the

      // collection set (i.e. we're not during an evacuation pause) _or_

      // the reference doesn't point into the collection set. Either way

      // we add the reference directly to the RSet of the region containing

      // the referenced object.

      _g1_rem_set->par_write_ref(_from, p, _worker_i);

    }

  }

}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP