src/hotspot/share/gc/z/zBarrierSet.hpp

/*
 * Copyright (c) 2015, 2019, 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_Z_ZBARRIERSET_HPP
#define SHARE_GC_Z_ZBARRIERSET_HPP

#include "gc/shared/barrierSet.hpp"

class ZBarrierSetAssembler;

class ZBarrierSet : public BarrierSet {
public:
  ZBarrierSet();

  static ZBarrierSetAssembler* assembler();
  static bool barrier_needed(DecoratorSet decorators, BasicType type);

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

  virtual void print_on(outputStream* st) const {}

  template <DecoratorSet decorators, typename BarrierSetT = ZBarrierSet>
  class AccessBarrier : public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
  private:
    typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;

    template <DecoratorSet expected>
    static void verify_decorators_present();

    template <DecoratorSet expected>
    static void verify_decorators_absent();

    static oop* field_addr(oop base, ptrdiff_t offset);

    template <typename T>
    static oop load_barrier_on_oop_field_preloaded(T* addr, oop o);

    template <typename T>
    static oop load_barrier_on_unknown_oop_field_preloaded(oop base, ptrdiff_t offset, T* addr, oop o);

  public:
    //
    // In heap
    //
    template <typename T>
    static oop oop_load_in_heap(T* addr);
    static oop oop_load_in_heap_at(oop base, ptrdiff_t offset);

    template <typename T>
    static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
    static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value);

    template <typename T>
    static oop oop_atomic_xchg_in_heap(T* addr, oop new_value);
    static oop oop_atomic_xchg_in_heap_at(oop base, ptrdiff_t offset, oop new_value);

    template <typename T>
    static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
                                      arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
                                      size_t length);

    static void clone_in_heap(oop src, oop dst, size_t size);

    //
    // Not in heap
    //
    template <typename T>
    static oop oop_load_not_in_heap(T* addr);

    template <typename T>
    static oop oop_atomic_cmpxchg_not_in_heap(oop new_value, T* addr, oop compare_value);

    template <typename T>
    static oop oop_atomic_xchg_not_in_heap(T* addr, oop new_value);
  };
};

template<> struct BarrierSet::GetName<ZBarrierSet> {
  static const BarrierSet::Name value = BarrierSet::ZBarrierSet;
};

template<> struct BarrierSet::GetType<BarrierSet::ZBarrierSet> {
  typedef ::ZBarrierSet type;
};

#endif // SHARE_GC_Z_ZBARRIERSET_HPP