/*

 * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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_SHENANDOAH_SHENANDOAHHEAPREGION_INLINE_HPP

#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGION_INLINE_HPP

#include "gc/shenandoah/shenandoahHeap.inline.hpp"

#include "gc/shenandoah/shenandoahHeapRegion.hpp"

#include "gc/shenandoah/shenandoahPacer.inline.hpp"

#include "runtime/atomic.hpp"

HeapWord* ShenandoahHeapRegion::allocate(size_t size, ShenandoahAllocRequest::Type type) {

  _heap->assert_heaplock_or_safepoint();

  HeapWord* obj = top();

  if (pointer_delta(end(), obj) >= size) {

    make_regular_allocation();

    adjust_alloc_metadata(type, size);

    HeapWord* new_top = obj + size;

    set_top(new_top);

    assert(is_aligned(obj) && is_aligned(new_top), "checking alignment");

    return obj;

  } else {

    return NULL;

  }

}

inline void ShenandoahHeapRegion::adjust_alloc_metadata(ShenandoahAllocRequest::Type type, size_t size) {

  bool is_first_alloc = (top() == bottom());

  switch (type) {

    case ShenandoahAllocRequest::_alloc_shared:

    case ShenandoahAllocRequest::_alloc_tlab:

      _seqnum_last_alloc_mutator = _alloc_seq_num.value++;

      if (is_first_alloc) {

        assert (_seqnum_first_alloc_mutator == 0, "Region " SIZE_FORMAT " metadata is correct", _region_number);

        _seqnum_first_alloc_mutator = _seqnum_last_alloc_mutator;

      }

      break;

    case ShenandoahAllocRequest::_alloc_shared_gc:

    case ShenandoahAllocRequest::_alloc_gclab:

      _seqnum_last_alloc_gc = _alloc_seq_num.value++;

      if (is_first_alloc) {

        assert (_seqnum_first_alloc_gc == 0, "Region " SIZE_FORMAT " metadata is correct", _region_number);

        _seqnum_first_alloc_gc = _seqnum_last_alloc_gc;

      }

      break;

    default:

      ShouldNotReachHere();

  }

  switch (type) {

    case ShenandoahAllocRequest::_alloc_shared:

    case ShenandoahAllocRequest::_alloc_shared_gc:

      _shared_allocs += size;

      break;

    case ShenandoahAllocRequest::_alloc_tlab:

      _tlab_allocs += size;

      break;

    case ShenandoahAllocRequest::_alloc_gclab:

      _gclab_allocs += size;

      break;

    default:

      ShouldNotReachHere();

  }

}

inline void ShenandoahHeapRegion::increase_live_data_alloc_words(size_t s) {

  internal_increase_live_data(s);

}

inline void ShenandoahHeapRegion::increase_live_data_gc_words(size_t s) {

  internal_increase_live_data(s);

  if (ShenandoahPacing) {

    _pacer->report_mark(s);

  }

}

inline void ShenandoahHeapRegion::internal_increase_live_data(size_t s) {

  size_t new_live_data = Atomic::add(s, &_live_data);

#ifdef ASSERT

  size_t live_bytes = new_live_data * HeapWordSize;

  size_t used_bytes = used();

  assert(live_bytes <= used_bytes,

         "can't have more live data than used: " SIZE_FORMAT ", " SIZE_FORMAT, live_bytes, used_bytes);

#endif

}

#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAPREGION_INLINE_HPP