57       mirror::Object* to_ref = GetFwdPtr(from_ref);  in Mark()  local
59         DCHECK_NE(to_ref, ReadBarrier::GrayPtr())  in Mark()
60             << "from_ref=" << from_ref << " to_ref=" << to_ref;  in Mark()
62       if (to_ref == nullptr) {  in Mark()
64         to_ref = Copy(from_ref);  in Mark()
66       DCHECK(region_space_->IsInToSpace(to_ref) || heap_->non_moving_space_->HasAddress(to_ref))  in Mark()
67           << "from_ref=" << from_ref << " to_ref=" << to_ref;  in Mark()
68       return to_ref;  in Mark()
75       mirror::Object* to_ref = from_ref;  in Mark()  local
81           DCHECK_EQ(to_ref->GetReadBarrierPointer(), ReadBarrier::GrayPtr());  in Mark()
83         PushOntoMarkStack(to_ref);  in Mark()
85       return to_ref;  in Mark()