422   const size_t length_in_bytes = static_cast<size_t>(_length) << ArrayKlass::cast(_klass)->log2_element_size();
423   const BasicType element_type = ArrayKlass::cast(_klass)->element_type();
424   const size_t base_offset_in_bytes = arrayOopDesc::base_offset_in_bytes(element_type);
425   const size_t size_in_bytes = _word_size * BytesPerWord;
426 
427   const address obj_end = reinterpret_cast<address>(mem) + size_in_bytes;
428   const address base = reinterpret_cast<address>(mem) + base_offset_in_bytes;
429   const address elements_end = base + length_in_bytes;
430   assert(elements_end <= obj_end, "payload must fit in object");
431   if (elements_end < obj_end) {
432     const size_t padding_in_bytes = obj_end - elements_end;
433     Copy::fill_to_bytes(elements_end, padding_in_bytes, heapPaddingByteVal);
434   }
435 }
436 #endif
437 
438 oop ClassAllocator::initialize(HeapWord* mem) const {
439   // Set oop_size field before setting the _klass field because a
440   // non-null _klass field indicates that the object is parsable by
441   // concurrent GC.
442   assert(_word_size > 0, "oop_size must be positive.");
443   mem_clear(mem);
444   java_lang_Class::set_oop_size(mem, _word_size);
445   return finish(mem);
446 }

422   const size_t length_in_bytes = static_cast<size_t>(_length) << ArrayKlass::cast(_klass)->log2_element_size();
423   const BasicType element_type = ArrayKlass::cast(_klass)->element_type();
424   const size_t base_offset_in_bytes = arrayOopDesc::base_offset_in_bytes(element_type);
425   const size_t size_in_bytes = _word_size * BytesPerWord;
426 
427   const address obj_end = reinterpret_cast<address>(mem) + size_in_bytes;
428   const address base = reinterpret_cast<address>(mem) + base_offset_in_bytes;
429   const address elements_end = base + length_in_bytes;
430   assert(elements_end <= obj_end, "payload must fit in object");
431   if (elements_end < obj_end) {
432     const size_t padding_in_bytes = obj_end - elements_end;
433     Copy::fill_to_bytes(elements_end, padding_in_bytes, heapPaddingByteVal);
434   }
435 }
436 #endif
437 
438 oop ClassAllocator::initialize(HeapWord* mem) const {
439   // Set oop_size field before setting the _klass field because a
440   // non-null _klass field indicates that the object is parsable by
441   // concurrent GC.
442   assert(_base_size > 0, "oop_size must be positive.");
443   mem_clear(mem);
444   java_lang_Class::set_oop_size(mem, _base_size);
445   return finish(mem);
446 }