On: Assault by GC

[JoachimSchipper]

Wouldn't the GC still need to check for references from permspace objects? (It's probably still a noticeable performance boost.)

[eru → JoachimSchipper]

Your language could disallow references from permspace to normal space. Or even make permspace objects immutable.

[fpgeek → eru]

Or just track the (presumably few) mutations of permspace objects for special handling. In that case, permspace effectively becomes an infinitely long-lived generation that is never collected, only used as a source of roots.

[stcredzero → fpgeek]

Bingo. I should have written "GC only uses it as a source of roots."