What are the meanings of the hash keys when calling ObjectSpace.count_objects?

Question

In Ruby 1.9 (YARV) you can get a count of all currently allocated objects like so:

ObjectSpace.count_objects

which returns a hash like

Answer 1

You can get more information about the T_DATA category by calling ObjectSpace.count_tdata_objects (described here).

I believe that these are native objects controlled by the VM. Sometimes native extensions can allocate them, as well.