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 /*

  * Copyright (c) 2001, 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

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  */

 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP

 #include "gc_implementation/g1/concurrentMark.hpp"

 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

 inline void CMTask::push(oop obj) {

   HeapWord* objAddr = (HeapWord*) obj;

   assert(_g1h->is_in_g1_reserved(objAddr), "invariant");

   assert(!_g1h->is_on_master_free_list(

               _g1h->heap_region_containing((HeapWord*) objAddr)), "invariant");

   assert(!_g1h->is_obj_ill(obj), "invariant");

   assert(_nextMarkBitMap->isMarked(objAddr), "invariant");

   if (_cm->verbose_high()) {

     gclog_or_tty->print_cr("[%d] pushing "PTR_FORMAT, _task_id, (void*) obj);

   }

   if (!_task_queue->push(obj)) {

     // The local task queue looks full. We need to push some entries

     // to the global stack.

     if (_cm->verbose_medium()) {

       gclog_or_tty->print_cr("[%d] task queue overflow, "

                              "moving entries to the global stack",

                              _task_id);

     }

     move_entries_to_global_stack();

     // this should succeed since, even if we overflow the global

     // stack, we should have definitely removed some entries from the

     // local queue. So, there must be space on it.

     bool success = _task_queue->push(obj);

     assert(success, "invariant");

   }

   statsOnly( int tmp_size = _task_queue->size();

              if (tmp_size > _local_max_size) {

                _local_max_size = tmp_size;

              }

              ++_local_pushes );

 }

 // This determines whether the method below will check both the local

 // and global fingers when determining whether to push on the stack a

 // gray object (value 1) or whether it will only check the global one

 // (value 0). The tradeoffs are that the former will be a bit more

 // accurate and possibly push less on the stack, but it might also be

 // a little bit slower.

 #define _CHECK_BOTH_FINGERS_      1

 inline void CMTask::deal_with_reference(oop obj) {

   if (_cm->verbose_high()) {

     gclog_or_tty->print_cr("[%d] we're dealing with reference = "PTR_FORMAT,

                            _task_id, (void*) obj);

   }

   ++_refs_reached;

   HeapWord* objAddr = (HeapWord*) obj;

   assert(obj->is_oop_or_null(true /* ignore mark word */), "Error");

  if (_g1h->is_in_g1_reserved(objAddr)) {

     assert(obj != NULL, "null check is implicit");

     if (!_nextMarkBitMap->isMarked(objAddr)) {

       // Only get the containing region if the object is not marked on the

       // bitmap (otherwise, it's a waste of time since we won't do

       // anything with it).

       HeapRegion* hr = _g1h->heap_region_containing_raw(obj);

       if (!hr->obj_allocated_since_next_marking(obj)) {

         if (_cm->verbose_high()) {

           gclog_or_tty->print_cr("[%d] "PTR_FORMAT" is not considered marked",

                                  _task_id, (void*) obj);

         }

         // we need to mark it first

         if (_nextMarkBitMap->parMark(objAddr)) {

           // No OrderAccess:store_load() is needed. It is implicit in the

           // CAS done in parMark(objAddr) above

           HeapWord* global_finger = _cm->finger();

 #if _CHECK_BOTH_FINGERS_

           // we will check both the local and global fingers

           if (_finger != NULL && objAddr < _finger) {

             if (_cm->verbose_high()) {

               gclog_or_tty->print_cr("[%d] below the local finger ("PTR_FORMAT"), "

                                      "pushing it", _task_id, _finger);

             }

             push(obj);

           } else if (_curr_region != NULL && objAddr < _region_limit) {

             // do nothing

           } else if (objAddr < global_finger) {

             // Notice that the global finger might be moving forward

             // concurrently. This is not a problem. In the worst case, we

             // mark the object while it is above the global finger and, by

             // the time we read the global finger, it has moved forward

             // passed this object. In this case, the object will probably

             // be visited when a task is scanning the region and will also

             // be pushed on the stack. So, some duplicate work, but no

             // correctness problems.

             if (_cm->verbose_high()) {

               gclog_or_tty->print_cr("[%d] below the global finger "

                                      "("PTR_FORMAT"), pushing it",

                                      _task_id, global_finger);

             }

             push(obj);

           } else {

             // do nothing

           }

 #else // _CHECK_BOTH_FINGERS_

           // we will only check the global finger

           if (objAddr < global_finger) {

             // see long comment above

             if (_cm->verbose_high()) {

               gclog_or_tty->print_cr("[%d] below the global finger "

                                      "("PTR_FORMAT"), pushing it",

                                      _task_id, global_finger);

             }

             push(obj);

           }

 #endif // _CHECK_BOTH_FINGERS_

         }

       }

     }

   }

 }

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_INLINE_HPP