1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. and/or its affiliates.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP
  26 
  27 #include "gc/shared/markBitMap.inline.hpp"
  28 #include "gc/shenandoah/shenandoahBarrierSet.inline.hpp"
  29 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
  30 #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
  31 #include "gc/shenandoah/shenandoahStringDedup.hpp"
  32 #include "gc/shenandoah/shenandoahTraversalGC.hpp"
  33 #include "gc/shenandoah/shenandoahTaskqueue.hpp"
  34 #include "memory/iterator.inline.hpp"
  35 #include "oops/oop.inline.hpp"
  36 
  37 template <class T, bool STRING_DEDUP>
  38 void ShenandoahTraversalGC::process_oop(T* p, Thread* thread, ShenandoahObjToScanQueue* queue, ShenandoahStrDedupQueue* dq) {
  39   T o = oopDesc::load_heap_oop(p);
  40   if (! oopDesc::is_null(o)) {
  41     oop obj = oopDesc::decode_heap_oop_not_null(o);
  42     if (_heap->in_collection_set(obj)) {
  43       oop forw = ShenandoahBarrierSet::resolve_forwarded_not_null(obj);
  44       if (oopDesc::unsafe_equals(obj, forw)) {
  45         bool evacuated = false;
  46         forw = _heap->evacuate_object(obj, thread, evacuated);
  47       }
  48       assert(! oopDesc::unsafe_equals(obj, forw) || _heap->cancelled_concgc(), "must be evacuated");
  49       // Update reference.
  50       _heap->atomic_compare_exchange_oop(forw, p, obj);
  51       obj = forw;
  52     }
  53 
  54     if (!_heap->is_marked_next(obj) && _heap->mark_next(obj)) {
  55       bool succeeded = queue->push(ShenandoahMarkTask(obj));
  56       assert(succeeded, "must succeed to push to task queue");
  57 
  58       if (STRING_DEDUP && ShenandoahStringDedup::is_candidate(obj)) {
  59         assert(ShenandoahStringDedup::is_enabled(), "Must be enabled");
  60         assert(dq != NULL, "Dedup queue not set");
  61         ShenandoahStringDedup::enqueue_candidate(obj, dq);
  62       }
  63     }
  64   }
  65 }
  66 
  67 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHTRAVERSALGC_INLINE_HPP