/*

 * Copyright (c) 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

#ifndef SHARE_GC_SHARED_C2_G1BARRIERSETC2_HPP

#define SHARE_GC_SHARED_C2_G1BARRIERSETC2_HPP

#include "gc/shared/c2/cardTableBarrierSetC2.hpp"

class PhaseTransform;

class Type;

class TypeFunc;

class G1BarrierSetC2: public CardTableBarrierSetC2 {

protected:

  virtual void pre_barrier(GraphKit* kit,

                           bool do_load,

                           Node* ctl,

                           Node* obj,

                           Node* adr,

                           uint adr_idx,

                           Node* val,

                           const TypeOopPtr* val_type,

                           Node* pre_val,

                           BasicType bt) const;

  virtual void post_barrier(GraphKit* kit,

                            Node* ctl,

                            Node* store,

                            Node* obj,

                            Node* adr,

                            uint adr_idx,

                            Node* val,

                            BasicType bt,

                            bool use_precise) const;

  bool g1_can_remove_pre_barrier(GraphKit* kit,

                                 PhaseTransform* phase,

                                 Node* adr,

                                 BasicType bt,

                                 uint adr_idx) const;

  bool g1_can_remove_post_barrier(GraphKit* kit,

                                  PhaseTransform* phase, Node* store,

                                  Node* adr) const;

  void g1_mark_card(GraphKit* kit,

                    IdealKit& ideal,

                    Node* card_adr,

                    Node* oop_store,

                    uint oop_alias_idx,

                    Node* index,

                    Node* index_adr,

                    Node* buffer,

                    const TypeFunc* tf) const;

  // Helper for unsafe accesses, that may or may not be on the referent field.

  // Generates the guards that check whether the result of

  // Unsafe.getReference should be recorded in an SATB log buffer.

  void insert_pre_barrier(GraphKit* kit, Node* base_oop, Node* offset, Node* pre_val, bool need_mem_bar) const;

  static const TypeFunc* write_ref_field_pre_entry_Type();

  static const TypeFunc* write_ref_field_post_entry_Type();

  virtual Node* load_at_resolved(C2Access& access, const Type* val_type) const;

 public:

  virtual bool is_gc_barrier_node(Node* node) const;

  virtual void eliminate_gc_barrier(PhaseMacroExpand* macro, Node* node) const;

  virtual Node* step_over_gc_barrier(Node* c) const;

};

#endif // SHARE_GC_SHARED_C2_G1BARRIERSETC2_HPP