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

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