src/hotspot/share/gc/shared/modRefBarrierSet.hpp
author eosterlund
Wed, 21 Mar 2018 14:38:32 +0100
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8198949: Modularize arraycopy stub routine GC barriers Reviewed-by: rkennke, pliden
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/*
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 * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP
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#define SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP
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#include "gc/shared/barrierSet.hpp"
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#include "memory/memRegion.hpp"
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class Klass;
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class ModRefBarrierSet: public BarrierSet {
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protected:
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  ModRefBarrierSet(BarrierSetAssembler* barrier_set_assembler,
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                   const BarrierSet::FakeRtti& fake_rtti)
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    : BarrierSet(barrier_set_assembler,
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                 fake_rtti.add_tag(BarrierSet::ModRef)) { }
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  ~ModRefBarrierSet() { }
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public:
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  template <DecoratorSet decorators, typename T>
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  inline void write_ref_field_pre(T* addr) {}
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  template <DecoratorSet decorators, typename T>
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  inline void write_ref_field_post(T *addr, oop new_value) {}
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  // Causes all refs in "mr" to be assumed to be modified.
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  virtual void invalidate(MemRegion mr) = 0;
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  virtual void write_region(MemRegion mr) = 0;
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  // Operations on arrays, or general regions (e.g., for "clone") may be
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  // optimized by some barriers.
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  // Below length is the # array elements being written
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  virtual void write_ref_array_pre(oop* dst, size_t length,
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                                   bool dest_uninitialized = false) {}
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  virtual void write_ref_array_pre(narrowOop* dst, size_t length,
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                                   bool dest_uninitialized = false) {}
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  // Below count is the # array elements being written, starting
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  // at the address "start", which may not necessarily be HeapWord-aligned
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  inline void write_ref_array(HeapWord* start, size_t count);
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 protected:
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  virtual void write_ref_array_work(MemRegion mr) = 0;
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 public:
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  // The ModRef abstraction introduces pre and post barriers
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  template <DecoratorSet decorators, typename BarrierSetT>
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  class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
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    typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
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  public:
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    template <typename T>
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    static void oop_store_in_heap(T* addr, oop value);
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    template <typename T>
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    static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
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    template <typename T>
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    static oop oop_atomic_xchg_in_heap(oop new_value, T* addr);
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    template <typename T>
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    static bool oop_arraycopy_in_heap(arrayOop src_obj, arrayOop dst_obj, T* src, T* dst, size_t length);
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    static void clone_in_heap(oop src, oop dst, size_t size);
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    static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) {
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      oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value);
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    }
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    static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) {
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      return oop_atomic_xchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset));
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    }
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    static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
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      return oop_atomic_cmpxchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset), compare_value);
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    }
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  };
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};
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template<>
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struct BarrierSet::GetName<ModRefBarrierSet> {
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  static const BarrierSet::Name value = BarrierSet::ModRef;
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};
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#endif // SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP