[Stackless] Ann: Stackless Python is DEAD! Long live Stackless Python

Sam Rushing rushing at nightmare.com
Sat Jan 19 01:33:51 CET 2002


Christian Tismer wrote:

> What I now do is to enforce stacklessness.
> The key function is PyEval_EvalCodeEx.
> This function calls
>         retval = eval_frame(f);
> and this is exactly what I capture.
> This call to eval_frame is wrapped by a special function
> of mine, which does the forbidden things.
> It checks, whether a recursive call of PyEval_EvalCodeEx
> is running. If so, the stack area between the current
> PyEval_EvalCodeEx and the former is saved into extra memory.
> Then, the current invocation's locals are moved up,
> and execution continues there.

Let me see if I understand this correctly - you are in effect changing 
C's execution model to one that uses a linked list of heap-allocated 
frames?  With PyEval_EvalCodeEx() being the 'frame granularity'?

Seems like this could run into trouble with an optimizing compiler...

-Sam


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