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Howdy,
Please review!
While implementing Stackless Python, a new problem arose:
Nested structures like frame chains and tracebacks can now
easily grow somuch that they cause a stack overflow on deallocation.
To protect lists, tuples, frames, dicts and tracebacks against
this, I wrote a stackless deallocator.
At the moment, everything is done in trashcan.c .
This gives a slight performance loss of 5% for pystone, most probably
due to the double indirection and non-local code reference.
It is yet a hack, since I'm grabbing the tp->dealloc pointers of these
types and replace them by safe versions. This just in order to
try out things quickly. Later I will change this and incorporate
the stack checks into the affected modules, after I got some
feedback on this.
This patch applies to Stackless and standard Python as well:
Deallocation of deeply nested structures will never again cause
a stack overflow.
Installation for the intermediate version:
Insert a line
_Py_trashcan_install();
at the end of Py_Initialize in pythonrun.c
Please try it and check my code wether there is a better solution.
cheers - chris
--
Christian Tismer :^) <mailto:tismer@appliedbiometrics.com>
Applied Biometrics GmbH : Have a break! Take a ride on Python's
Düppelstr. 31 : *Starship* http://starship.python.net
12163 Berlin : PGP key -> http://wwwkeys.pgp.net
PGP Fingerprint E182 71C7 1A9D 66E9 9D15 D3CC D4D7 93E2 1FAE F6DF
we're tired of banana software - shipped green, ripens at home
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