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src/hotspot/share/gc/parallel/psPromotionLAB.cpp

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  66   }
  67 
  68   assert(this->top() <= this->end(), "pointers out of order");
  69 }
  70 
  71 // Fill all remaining lab space with an unreachable object.
  72 // The goal is to leave a contiguous parseable span of objects.
  73 void PSPromotionLAB::flush() {
  74   assert(_state != flushed, "Attempt to flush PLAB twice");
  75   assert(top() <= end(), "pointers out of order");
  76 
  77   // If we were initialized to a zero sized lab, there is
  78   // nothing to flush
  79   if (_state == zero_size)
  80     return;
  81 
  82   // PLAB's never allocate the last aligned_header_size
  83   // so they can always fill with an array.
  84   HeapWord* tlab_end = end() + filler_header_size;
  85   typeArrayOop filler_oop = (typeArrayOop) top();
  86   filler_oop->set_mark_raw(markWord::prototype());
  87   filler_oop->set_klass(Universe::intArrayKlassObj());
  88   const size_t array_length =
  89     pointer_delta(tlab_end, top()) - typeArrayOopDesc::header_size(T_INT);
  90   assert( (array_length * (HeapWordSize/sizeof(jint))) < (size_t)max_jint, "array too big in PSPromotionLAB");
  91   filler_oop->set_length((int)(array_length * (HeapWordSize/sizeof(jint))));
  92 
  93 #ifdef ASSERT
  94   // Note that we actually DO NOT want to use the aligned header size!
  95   HeapWord* elt_words = ((HeapWord*)filler_oop) + typeArrayOopDesc::header_size(T_INT);
  96   Copy::fill_to_words(elt_words, array_length, 0xDEAABABE);
  97 #endif
  98 
  99   set_bottom(NULL);
 100   set_end(NULL);
 101   set_top(NULL);
 102 
 103   _state = flushed;
 104 }
 105 
 106 bool PSPromotionLAB::unallocate_object(HeapWord* obj, size_t obj_size) {




  66   }
  67 
  68   assert(this->top() <= this->end(), "pointers out of order");
  69 }
  70 
  71 // Fill all remaining lab space with an unreachable object.
  72 // The goal is to leave a contiguous parseable span of objects.
  73 void PSPromotionLAB::flush() {
  74   assert(_state != flushed, "Attempt to flush PLAB twice");
  75   assert(top() <= end(), "pointers out of order");
  76 
  77   // If we were initialized to a zero sized lab, there is
  78   // nothing to flush
  79   if (_state == zero_size)
  80     return;
  81 
  82   // PLAB's never allocate the last aligned_header_size
  83   // so they can always fill with an array.
  84   HeapWord* tlab_end = end() + filler_header_size;
  85   typeArrayOop filler_oop = (typeArrayOop) top();
  86   filler_oop->set_mark_raw(markOopDesc::prototype());
  87   filler_oop->set_klass(Universe::intArrayKlassObj());
  88   const size_t array_length =
  89     pointer_delta(tlab_end, top()) - typeArrayOopDesc::header_size(T_INT);
  90   assert( (array_length * (HeapWordSize/sizeof(jint))) < (size_t)max_jint, "array too big in PSPromotionLAB");
  91   filler_oop->set_length((int)(array_length * (HeapWordSize/sizeof(jint))));
  92 
  93 #ifdef ASSERT
  94   // Note that we actually DO NOT want to use the aligned header size!
  95   HeapWord* elt_words = ((HeapWord*)filler_oop) + typeArrayOopDesc::header_size(T_INT);
  96   Copy::fill_to_words(elt_words, array_length, 0xDEAABABE);
  97 #endif
  98 
  99   set_bottom(NULL);
 100   set_end(NULL);
 101   set_top(NULL);
 102 
 103   _state = flushed;
 104 }
 105 
 106 bool PSPromotionLAB::unallocate_object(HeapWord* obj, size_t obj_size) {


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