269   oop forwardee = o->forward_to_atomic(new_obj, test_mark, memory_order_relaxed);
270   if (forwardee == nullptr) {  // forwardee is null when forwarding is successful
271     // We won any races, we "own" this object.
272     assert(new_obj == o->forwardee(), "Sanity");
273 
274     // Increment age if obj still in new generation. Now that
275     // we're dealing with a markWord that cannot change, it is
276     // okay to use the non mt safe oop methods.
277     if (!new_obj_is_tenured) {
278       new_obj->incr_age();
279       assert(young_space()->contains(new_obj), "Attempt to push non-promoted obj");
280     }
281 
282     ContinuationGCSupport::transform_stack_chunk(new_obj);
283 
284     // Do the size comparison first with new_obj_size, which we
285     // already have. Hopefully, only a few objects are larger than
286     // _min_array_size_for_chunking, and most of them will be arrays.
287     // So, the is->objArray() test would be very infrequent.
288     if (new_obj_size > _min_array_size_for_chunking &&
289         new_obj->is_objArray() &&
290         PSChunkLargeArrays) {
291       push_objArray(o, new_obj);
292     } else {
293       // we'll just push its contents
294       push_contents(new_obj);
295 
296       if (StringDedup::is_enabled() &&
297           java_lang_String::is_instance(new_obj) &&
298           psStringDedup::is_candidate_from_evacuation(new_obj, new_obj_is_tenured)) {
299         _string_dedup_requests.add(o);
300       }
301     }
302     return new_obj;
303   } else {
304     // We lost, someone else "owns" this object.
305 
306     assert(o->is_forwarded(), "Object must be forwarded if the cas failed.");
307     assert(o->forwardee() == forwardee, "invariant");
308 
309     if (new_obj_is_tenured) {

269   oop forwardee = o->forward_to_atomic(new_obj, test_mark, memory_order_relaxed);
270   if (forwardee == nullptr) {  // forwardee is null when forwarding is successful
271     // We won any races, we "own" this object.
272     assert(new_obj == o->forwardee(), "Sanity");
273 
274     // Increment age if obj still in new generation. Now that
275     // we're dealing with a markWord that cannot change, it is
276     // okay to use the non mt safe oop methods.
277     if (!new_obj_is_tenured) {
278       new_obj->incr_age();
279       assert(young_space()->contains(new_obj), "Attempt to push non-promoted obj");
280     }
281 
282     ContinuationGCSupport::transform_stack_chunk(new_obj);
283 
284     // Do the size comparison first with new_obj_size, which we
285     // already have. Hopefully, only a few objects are larger than
286     // _min_array_size_for_chunking, and most of them will be arrays.
287     // So, the is->objArray() test would be very infrequent.
288     if (new_obj_size > _min_array_size_for_chunking &&
289         new_obj->is_refArray() &&
290         PSChunkLargeArrays) {
291       push_objArray(o, new_obj);
292     } else {
293       // we'll just push its contents
294       push_contents(new_obj);
295 
296       if (StringDedup::is_enabled() &&
297           java_lang_String::is_instance(new_obj) &&
298           psStringDedup::is_candidate_from_evacuation(new_obj, new_obj_is_tenured)) {
299         _string_dedup_requests.add(o);
300       }
301     }
302     return new_obj;
303   } else {
304     // We lost, someone else "owns" this object.
305 
306     assert(o->is_forwarded(), "Object must be forwarded if the cas failed.");
307     assert(o->forwardee() == forwardee, "invariant");
308 
309     if (new_obj_is_tenured) {