view src/hotspot/share/gc/g1/g1BarrierSet.hpp @ 49677:93d84f667d12

8201318: Introduce GCThreadLocalData to abstract GC-specific data belonging to a thread Reviewed-by: shade, rehn
author pliden
date Thu, 12 Apr 2018 08:25:56 +0200
parents c3a10df652c0
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 * 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.
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 * questions.


#include "gc/g1/dirtyCardQueue.hpp"
#include "gc/g1/satbMarkQueue.hpp"
#include "gc/shared/cardTableBarrierSet.hpp"

class DirtyCardQueueSet;
class CardTable;
class G1CardTable;

// This barrier is specialized to use a logging barrier to support
// snapshot-at-the-beginning marking.

class G1BarrierSet: public CardTableBarrierSet {
  friend class VMStructs;
  static SATBMarkQueueSet  _satb_mark_queue_set;
  static DirtyCardQueueSet _dirty_card_queue_set;

  G1BarrierSet(G1CardTable* table);
  ~G1BarrierSet() { }

  // Add "pre_val" to a set of objects that may have been disconnected from the
  // pre-marking object graph.
  static void enqueue(oop pre_val);

  static void enqueue_if_weak_or_archive(DecoratorSet decorators, oop value);

  template <class T> void write_ref_array_pre_work(T* dst, size_t count);
  virtual void write_ref_array_pre(oop* dst, size_t count, bool dest_uninitialized);
  virtual void write_ref_array_pre(narrowOop* dst, size_t count, bool dest_uninitialized);

  static void write_ref_array_pre_oop_entry(oop* dst, size_t length);
  static void write_ref_array_pre_narrow_oop_entry(narrowOop* dst, size_t length);
  static void write_ref_array_post_entry(HeapWord* dst, size_t length);

  template <DecoratorSet decorators, typename T>
  void write_ref_field_pre(T* field);

  // NB: if you do a whole-heap invalidation, the "usual invariant" defined
  // above no longer applies.
  void invalidate(MemRegion mr);

  void write_region(MemRegion mr)         { invalidate(mr); }
  void write_ref_array_work(MemRegion mr) { invalidate(mr); }

  template <DecoratorSet decorators, typename T>
  void write_ref_field_post(T* field, oop new_val);
  void write_ref_field_post_slow(volatile jbyte* byte);

  virtual void on_thread_create(Thread* thread);
  virtual void on_thread_destroy(Thread* thread);
  virtual void on_thread_attach(JavaThread* thread);
  virtual void on_thread_detach(JavaThread* thread);

  static SATBMarkQueueSet& satb_mark_queue_set() {
    return _satb_mark_queue_set;

  static DirtyCardQueueSet& dirty_card_queue_set() {
    return _dirty_card_queue_set;

  // Callbacks for runtime accesses.
  template <DecoratorSet decorators, typename BarrierSetT = G1BarrierSet>
  class AccessBarrier: public ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> {
    typedef ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> ModRef;
    typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;

    // Needed for loads on non-heap weak references
    template <typename T>
    static oop oop_load_not_in_heap(T* addr);

    // Needed for non-heap stores
    template <typename T>
    static void oop_store_not_in_heap(T* addr, oop new_value);

    // Needed for weak references
    static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);

    // Defensive: will catch weak oops at addresses in heap
    template <typename T>
    static oop oop_load_in_heap(T* addr);

struct BarrierSet::GetName<G1BarrierSet> {
  static const BarrierSet::Name value = BarrierSet::G1BarrierSet;

struct BarrierSet::GetType<BarrierSet::G1BarrierSet> {
  typedef ::G1BarrierSet type;