/*

 * 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_HEAPREGIONSET_INLINE_HPP

#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP

#include "gc_implementation/g1/heapRegionSet.hpp"

inline void HeapRegionSetBase::add(HeapRegion* hr) {

  check_mt_safety();

  assert(hr->containing_set() == NULL, hrs_ext_msg(this, "should not already have a containing set %u"));

  assert(hr->next() == NULL, hrs_ext_msg(this, "should not already be linked"));

  _count.increment(1u, hr->capacity());

  hr->set_containing_set(this);

  verify_region(hr);

}

inline void HeapRegionSetBase::remove(HeapRegion* hr) {

  check_mt_safety();

  verify_region(hr);

  assert(hr->next() == NULL, hrs_ext_msg(this, "should already be unlinked"));

  hr->set_containing_set(NULL);

  assert(_count.length() > 0, hrs_ext_msg(this, "pre-condition"));

  _count.decrement(1u, hr->capacity());

}

inline void FreeRegionList::add_as_head(HeapRegion* hr) {

  assert((length() == 0 && _head == NULL && _tail == NULL) ||

         (length() >  0 && _head != NULL && _tail != NULL),

         hrs_ext_msg(this, "invariant"));

  // add() will verify the region and check mt safety.

  add(hr);

  // Now link the region.

  if (_head != NULL) {

    hr->set_next(_head);

  } else {

    _tail = hr;

  }

  _head = hr;

}

inline void FreeRegionList::add_as_tail(HeapRegion* hr) {

  check_mt_safety();

  assert((length() == 0 && _head == NULL && _tail == NULL) ||

         (length() >  0 && _head != NULL && _tail != NULL),

         hrs_ext_msg(this, "invariant"));

  add(hr);

  // Now link the region.

  if (_tail != NULL) {

    _tail->set_next(hr);

  } else {

    _head = hr;

  }

  _tail = hr;

}

inline HeapRegion* FreeRegionList::remove_head() {

  assert(!is_empty(), hrs_ext_msg(this, "the list should not be empty"));

  assert(length() > 0 && _head != NULL && _tail != NULL,

         hrs_ext_msg(this, "invariant"));

  // We need to unlink it first.

  HeapRegion* hr = _head;

  _head = hr->next();

  if (_head == NULL) {

    _tail = NULL;

  }

  hr->set_next(NULL);

  remove(hr);

  return hr;

}

inline HeapRegion* FreeRegionList::remove_head_or_null() {

  check_mt_safety();

  if (!is_empty()) {

    return remove_head();

  } else {

    return NULL;

  }

}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP