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

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