[Stackless] PEP 3146: Merging Unladen Swallow into Python

Richard Tew richard.m.tew at gmail.com
Sun Feb 21 19:32:49 CET 2010

My Google Alert picked up an interesting reference to Stackless this
morning.  It relates to how if the Unladen Swallow merge into Python
goes ahead, how Stackless might need to change (with us doing the


-- >8 -- 8< --

Invasive forks of CPython such as Stackless Python [115]  are more
challenging to support. Since Stackless is highly unlikely to be
merged into CPython [116] and an increased maintenance burden is part
and parcel of any fork, we consider compatibility with Stackless to be
relatively low-priority. JIT-compiled stack frames use the C stack, so
Stackless should be able to treat them the same as it treats calls
through extension modules. If that turns out to be unacceptable,
Stackless could either remove the JIT compiler or improve JIT code
generation to better support heap-based stack frames [117], [118].

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