/*

 * Copyright (c) 2001, 2018, 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.

 *

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 */

#ifndef SHARE_VM_GC_G1_G1BARRIERSET_HPP

#define SHARE_VM_GC_G1_G1BARRIERSET_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;

 private:

  DirtyCardQueueSet& _dcqs;

 public:

  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 <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_attach(JavaThread* thread);

  virtual void on_thread_detach(JavaThread* thread);

  // 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;

  public:

    // 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);

  };

};

template<>

struct BarrierSet::GetName<G1BarrierSet> {

  static const BarrierSet::Name value = BarrierSet::G1BarrierSet;

};

template<>

struct BarrierSet::GetType<BarrierSet::G1BarrierSet> {

  typedef ::G1BarrierSet type;

};

#endif // SHARE_VM_GC_G1_G1BARRIERSET_HPP