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src/hotspot/share/gc/shared/modRefBarrierSet.hpp

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  51   inline void write_ref_field_post(T *addr, oop new_value) {}
  52 
  53   // Causes all refs in "mr" to be assumed to be modified.
  54   virtual void invalidate(MemRegion mr) = 0;
  55   virtual void write_region(MemRegion mr) = 0;
  56 
  57   // Operations on arrays, or general regions (e.g., for "clone") may be
  58   // optimized by some barriers.
  59 
  60   // Below length is the # array elements being written
  61   virtual void write_ref_array_pre(oop* dst, size_t length,
  62                                    bool dest_uninitialized = false) {}
  63   virtual void write_ref_array_pre(narrowOop* dst, size_t length,
  64                                    bool dest_uninitialized = false) {}
  65   // Below count is the # array elements being written, starting
  66   // at the address "start", which may not necessarily be HeapWord-aligned
  67   inline void write_ref_array(HeapWord* start, size_t count);
  68 
  69  protected:
  70   virtual void write_ref_array_work(MemRegion mr) = 0;
  71 
  72  public:
  73   // The ModRef abstraction introduces pre and post barriers
  74   template <DecoratorSet decorators, typename BarrierSetT>
  75   class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
  76     typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
  77 
  78   public:
  79     template <typename T>
  80     static void oop_store_in_heap(T* addr, oop value);
  81     template <typename T>
  82     static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
  83     template <typename T>
  84     static oop oop_atomic_xchg_in_heap(oop new_value, T* addr);
  85 
  86     template <typename T>
  87     static bool oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
  88                                       arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
  89                                       size_t length);
  90 




  91     static void clone_in_heap(oop src, oop dst, size_t size);
  92 
  93     static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) {
  94       oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value);
  95     }
  96 
  97     static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) {
  98       return oop_atomic_xchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset));
  99     }
 100 
 101     static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
 102       return oop_atomic_cmpxchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset), compare_value);
 103     }
 104   };
 105 };
 106 
 107 template<>
 108 struct BarrierSet::GetName<ModRefBarrierSet> {
 109   static const BarrierSet::Name value = BarrierSet::ModRef;
 110 };


  51   inline void write_ref_field_post(T *addr, oop new_value) {}
  52 
  53   // Causes all refs in "mr" to be assumed to be modified.
  54   virtual void invalidate(MemRegion mr) = 0;
  55   virtual void write_region(MemRegion mr) = 0;
  56 
  57   // Operations on arrays, or general regions (e.g., for "clone") may be
  58   // optimized by some barriers.
  59 
  60   // Below length is the # array elements being written
  61   virtual void write_ref_array_pre(oop* dst, size_t length,
  62                                    bool dest_uninitialized = false) {}
  63   virtual void write_ref_array_pre(narrowOop* dst, size_t length,
  64                                    bool dest_uninitialized = false) {}
  65   // Below count is the # array elements being written, starting
  66   // at the address "start", which may not necessarily be HeapWord-aligned
  67   inline void write_ref_array(HeapWord* start, size_t count);
  68 
  69  protected:
  70   virtual void write_ref_array_work(MemRegion mr) = 0;

  71  public:
  72   // The ModRef abstraction introduces pre and post barriers
  73   template <DecoratorSet decorators, typename BarrierSetT>
  74   class AccessBarrier: public BarrierSet::AccessBarrier<decorators, BarrierSetT> {
  75     typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw;
  76 
  77   public:
  78     template <typename T>
  79     static void oop_store_in_heap(T* addr, oop value);
  80     template <typename T>
  81     static oop oop_atomic_cmpxchg_in_heap(oop new_value, T* addr, oop compare_value);
  82     template <typename T>
  83     static oop oop_atomic_xchg_in_heap(oop new_value, T* addr);
  84 
  85     template <typename T>
  86     static void oop_arraycopy_in_heap(arrayOop src_obj, size_t src_offset_in_bytes, T* src_raw,
  87                                       arrayOop dst_obj, size_t dst_offset_in_bytes, T* dst_raw,
  88                                       size_t length);
  89   private:
  90     // Failing checkcast or check null during copy, still needs barrier
  91     template <typename T>
  92     static inline void oop_arraycopy_partial_barrier(BarrierSetT *bs, T* dst_raw, T* p);
  93   public:
  94     static void clone_in_heap(oop src, oop dst, size_t size);
  95 
  96     static void oop_store_in_heap_at(oop base, ptrdiff_t offset, oop value) {
  97       oop_store_in_heap(AccessInternal::oop_field_addr<decorators>(base, offset), value);
  98     }
  99 
 100     static oop oop_atomic_xchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset) {
 101       return oop_atomic_xchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset));
 102     }
 103 
 104     static oop oop_atomic_cmpxchg_in_heap_at(oop new_value, oop base, ptrdiff_t offset, oop compare_value) {
 105       return oop_atomic_cmpxchg_in_heap(new_value, AccessInternal::oop_field_addr<decorators>(base, offset), compare_value);
 106     }
 107   };
 108 };
 109 
 110 template<>
 111 struct BarrierSet::GetName<ModRefBarrierSet> {
 112   static const BarrierSet::Name value = BarrierSet::ModRef;
 113 };
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