< prev index next >

src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.inline.hpp

Print this page
rev 60500 : 8251359: Shenandoah: filter null oops before calling enqueue/SATB barrier


  60   shenandoah_assert_in_cset(load_addr, obj);
  61 
  62   oop fwd = resolve_forwarded_not_null_mutator(obj);
  63   if (obj == fwd) {
  64     assert(_heap->is_evacuation_in_progress(),
  65            "evac should be in progress");
  66     Thread* const t = Thread::current();
  67     ShenandoahEvacOOMScope scope(t);
  68     fwd = _heap->evacuate_object(obj, t);
  69   }
  70 
  71   if (load_addr != NULL && fwd != obj) {
  72     // Since we are here and we know the load address, update the reference.
  73     ShenandoahHeap::cas_oop(fwd, load_addr, obj);
  74   }
  75 
  76   return fwd;
  77 }
  78 
  79 inline void ShenandoahBarrierSet::enqueue(oop obj) {

  80   assert(_satb_mark_queue_set.is_active(), "only get here when SATB active");
  81 
  82   // Filter marked objects before hitting the SATB queues. The same predicate would
  83   // be used by SATBMQ::filter to eliminate already marked objects downstream, but
  84   // filtering here helps to avoid wasteful SATB queueing work to begin with.
  85   if (!_heap->requires_marking(obj)) return;
  86 
  87   ShenandoahThreadLocalData::satb_mark_queue(Thread::current()).enqueue_known_active(obj);
  88 }
  89 
  90 template <DecoratorSet decorators, typename T>
  91 inline void ShenandoahBarrierSet::satb_barrier(T *field) {
  92   if (HasDecorator<decorators, IS_DEST_UNINITIALIZED>::value ||
  93       HasDecorator<decorators, AS_NO_KEEPALIVE>::value) {
  94     return;
  95   }
  96   if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) {
  97     T heap_oop = RawAccess<>::oop_load(field);
  98     if (!CompressedOops::is_null(heap_oop)) {
  99       enqueue(CompressedOops::decode(heap_oop));
 100     }
 101   }
 102 }
 103 
 104 inline void ShenandoahBarrierSet::satb_enqueue(oop value) {
 105   assert(value != NULL, "checked before");
 106   if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) {
 107     enqueue(value);
 108   }
 109 }
 110 
 111 inline void ShenandoahBarrierSet::storeval_barrier(oop obj) {
 112   if (ShenandoahStoreValEnqueueBarrier && obj != NULL && _heap->is_concurrent_mark_in_progress()) {
 113     enqueue(obj);
 114   }
 115 }
 116 
 117 inline void ShenandoahBarrierSet::keep_alive_if_weak(DecoratorSet decorators, oop value) {
 118   assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");

 119   const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
 120   const bool peek              = (decorators & AS_NO_KEEPALIVE) != 0;
 121   if (!peek && !on_strong_oop_ref) {
 122     satb_enqueue(value);
 123   }
 124 }
 125 
 126 template <DecoratorSet decorators>
 127 inline void ShenandoahBarrierSet::keep_alive_if_weak(oop value) {

 128   assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
 129   if (!HasDecorator<decorators, ON_STRONG_OOP_REF>::value &&
 130       !HasDecorator<decorators, AS_NO_KEEPALIVE>::value) {
 131     satb_enqueue(value);
 132   }
 133 }
 134 
 135 template <DecoratorSet decorators, typename BarrierSetT>
 136 template <typename T>
 137 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_load_not_in_heap(T* addr) {
 138   oop value = Raw::oop_load_not_in_heap(addr);
 139   if (value != NULL) {
 140     ShenandoahBarrierSet *const bs = ShenandoahBarrierSet::barrier_set();
 141     value = bs->load_reference_barrier_native(value, addr);
 142     if (value != NULL) {
 143       bs->keep_alive_if_weak<decorators>(value);
 144     }
 145   }
 146   return value;
 147 }




  60   shenandoah_assert_in_cset(load_addr, obj);
  61 
  62   oop fwd = resolve_forwarded_not_null_mutator(obj);
  63   if (obj == fwd) {
  64     assert(_heap->is_evacuation_in_progress(),
  65            "evac should be in progress");
  66     Thread* const t = Thread::current();
  67     ShenandoahEvacOOMScope scope(t);
  68     fwd = _heap->evacuate_object(obj, t);
  69   }
  70 
  71   if (load_addr != NULL && fwd != obj) {
  72     // Since we are here and we know the load address, update the reference.
  73     ShenandoahHeap::cas_oop(fwd, load_addr, obj);
  74   }
  75 
  76   return fwd;
  77 }
  78 
  79 inline void ShenandoahBarrierSet::enqueue(oop obj) {
  80   assert(!CompressedOops::is_null(obj), "checked by caller");
  81   assert(_satb_mark_queue_set.is_active(), "only get here when SATB active");
  82 
  83   // Filter marked objects before hitting the SATB queues. The same predicate would
  84   // be used by SATBMQ::filter to eliminate already marked objects downstream, but
  85   // filtering here helps to avoid wasteful SATB queueing work to begin with.
  86   if (!_heap->requires_marking(obj)) return;
  87 
  88   ShenandoahThreadLocalData::satb_mark_queue(Thread::current()).enqueue_known_active(obj);
  89 }
  90 
  91 template <DecoratorSet decorators, typename T>
  92 inline void ShenandoahBarrierSet::satb_barrier(T *field) {
  93   if (HasDecorator<decorators, IS_DEST_UNINITIALIZED>::value ||
  94       HasDecorator<decorators, AS_NO_KEEPALIVE>::value) {
  95     return;
  96   }
  97   if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) {
  98     T heap_oop = RawAccess<>::oop_load(field);
  99     if (!CompressedOops::is_null(heap_oop)) {
 100       enqueue(CompressedOops::decode(heap_oop));
 101     }
 102   }
 103 }
 104 
 105 inline void ShenandoahBarrierSet::satb_enqueue(oop value) {
 106   assert(value != NULL, "checked before");
 107   if (ShenandoahSATBBarrier && _heap->is_concurrent_mark_in_progress()) {
 108     enqueue(value);
 109   }
 110 }
 111 
 112 inline void ShenandoahBarrierSet::storeval_barrier(oop obj) {
 113   if (ShenandoahStoreValEnqueueBarrier && obj != NULL && _heap->is_concurrent_mark_in_progress()) {
 114     enqueue(obj);
 115   }
 116 }
 117 
 118 inline void ShenandoahBarrierSet::keep_alive_if_weak(DecoratorSet decorators, oop value) {
 119   assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
 120   assert(!CompressedOops::is_null(value), "checked by caller");
 121   const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
 122   const bool peek              = (decorators & AS_NO_KEEPALIVE) != 0;
 123   if (!peek && !on_strong_oop_ref) {
 124     satb_enqueue(value);
 125   }
 126 }
 127 
 128 template <DecoratorSet decorators>
 129 inline void ShenandoahBarrierSet::keep_alive_if_weak(oop value) {
 130   assert(!CompressedOops::is_null(value), "checked by caller");
 131   assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
 132   if (!HasDecorator<decorators, ON_STRONG_OOP_REF>::value &&
 133       !HasDecorator<decorators, AS_NO_KEEPALIVE>::value) {
 134     satb_enqueue(value);
 135   }
 136 }
 137 
 138 template <DecoratorSet decorators, typename BarrierSetT>
 139 template <typename T>
 140 inline oop ShenandoahBarrierSet::AccessBarrier<decorators, BarrierSetT>::oop_load_not_in_heap(T* addr) {
 141   oop value = Raw::oop_load_not_in_heap(addr);
 142   if (value != NULL) {
 143     ShenandoahBarrierSet *const bs = ShenandoahBarrierSet::barrier_set();
 144     value = bs->load_reference_barrier_native(value, addr);
 145     if (value != NULL) {
 146       bs->keep_alive_if_weak<decorators>(value);
 147     }
 148   }
 149   return value;
 150 }


< prev index next >