eightbitraptor[wiki]

Ruby Objspace

• rb_objspace_t struct - accessed by the rb_objspace macro.
  • Contains information about the garbage collector.
  • malloc_params - not sure what these are used for (I mean, I assume they’re given to malloc calls, but I don’t know what they mean). limit, increase, and optionally if defined, allocated_size and allocations
  • a struct flags that contains some bit fields
    • mode - ?
    • immediate_sweep - ?
    • dont_gc - ?
    • dont_incremental - ?
    • during_gc - ?
    • duringcompacting` - ?
    • gc_stressful - ?
    • has_hook - ?
    • during_minor_gc - ?
  • A count of the total allocated objects total_allocated_objects as well as a VALUE pointer to the next_object_id. I think this is in reference to what one of Arron’s rubyconf keynotes talked about wrt how object id assignment changed. TODO: Look this up later.
  • Probably the most important things here: 2 instances of rb_heap_t for the eden_heap and the tomb_heap - These are the heaps where RVALUE’s are allocated.
  • Some other stuff: TODO: Come back to this later.