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 /*

  * copyright (c) 2011, 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_HEAPREGIONSET_INLINE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP

 #include "gc_implementation/g1/heapRegionSet.hpp"

 //////////////////// HeapRegionSetBase ////////////////////

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

   // Assumes the caller has already verified the region.

   _length           += 1;

   if (!hr->isHumongous()) {

     _region_num     += 1;

   } else {

     _region_num     += calculate_region_num(hr);

   }

   _total_used_bytes += hr->used();

 }

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

   hrl_assert_region_ok(this, hr, NULL);

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

   update_for_addition(hr);

   hr->set_containing_set(this);

 }

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

   // Assumes the caller has already verified the region.

   assert(_length > 0, hrl_ext_msg(this, "pre-condition"));

   _length -= 1;

   size_t region_num_diff;

   if (!hr->isHumongous()) {

     region_num_diff = 1;

   } else {

     region_num_diff = calculate_region_num(hr);

   }

   assert(region_num_diff <= _region_num,

          hrl_err_msg("[%s] region's region num: "SIZE_FORMAT" "

                      "should be <= region num: "SIZE_FORMAT,

                      name(), region_num_diff, _region_num));

   _region_num -= region_num_diff;

   size_t used_bytes = hr->used();

   assert(used_bytes <= _total_used_bytes,

          hrl_err_msg("[%s] region's used bytes: "SIZE_FORMAT" "

                      "should be <= used bytes: "SIZE_FORMAT,

                      name(), used_bytes, _total_used_bytes));

   _total_used_bytes -= used_bytes;

 }

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

   hrl_assert_region_ok(this, hr, this);

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

   hr->set_containing_set(NULL);

   update_for_removal(hr);

 }

 //////////////////// HeapRegionSet ////////////////////

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

   hrl_assert_mt_safety_ok(this);

   // add_internal() will verify the region.

   add_internal(hr);

 }

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

   hrl_assert_mt_safety_ok(this);

   // remove_internal() will verify the region.

   remove_internal(hr);

 }

 inline void HeapRegionSet::remove_with_proxy(HeapRegion* hr,

                                              HeapRegionSet* proxy_set) {

   // No need to fo the MT safety check here given that this method

   // does not update the contents of the set but instead accumulates

   // the changes in proxy_set which is assumed to be thread-local.

   hrl_assert_sets_match(this, proxy_set);

   hrl_assert_region_ok(this, hr, this);

   hr->set_containing_set(NULL);

   proxy_set->update_for_addition(hr);

 }

 //////////////////// HeapRegionLinkedList ////////////////////

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

   hrl_assert_mt_safety_ok(this);

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

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

          hrl_ext_msg(this, "invariant"));

   // add_internal() will verify the region.

   add_internal(hr);

   // Now link the region.

   if (_tail != NULL) {

     _tail->set_next(hr);

   } else {

     _head = hr;

   }

   _tail = hr;

 }

 inline HeapRegion* HeapRegionLinkedList::remove_head() {

   hrl_assert_mt_safety_ok(this);

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

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

          hrl_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_internal() will verify the region.

   remove_internal(hr);

   return hr;

 }

 inline HeapRegion* HeapRegionLinkedList::remove_head_or_null() {

   hrl_assert_mt_safety_ok(this);

   if (!is_empty()) {

     return remove_head();

   } else {

     return NULL;

   }

 }

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP