kichikuou 12ddb585fb Rework delegate implementation ...

Delegates "weakly" reference objects, meaning that referenced objects
can be deleted. Delegate invocations must not invoke on deleted objects.
This is achieved as follows:

* Each heap object has a sequential number.
* Each delegate object is backed by a page storing (object, function,
  seq) triples.
* Deleted objects can be detected by comparing the sequential number
  stored in the delegate with the sequential number of the object
  currently on the heap.

This is consistent with the AliceSoft's implementation (presumed from
the contents of resume save).

This implementation removes dead objects from the delegate in DG_CALL
and DG_NUMOF instructions. (We could do that more often, e.g. when an
object is added to a delegate.)

This breaks existing resume saves that contain delegates. For games that
predate delegate support, this does not affect the save format.

2024-08-05 16:25:08 +09:00

..

heap.h

Rework delegate implementation

2024-08-05 16:25:08 +09:00

page.h

Rework delegate implementation

2024-08-05 16:25:08 +09:00