[Python-Dev] API design question: how to extend sys.settrace()? (original) (raw)
Guido van Rossum guido at python.org
Wed Sep 27 11🔞26 EDT 2017
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On Wed, Sep 27, 2017 at 8:10 AM, Serhiy Storchaka <storchaka at gmail.com> wrote:
I afraid that this change breaks an assumption in framesetlineno() about the state of the stack. This can corrupt the stack if you jump from the instruction which is a part of Python operation. For example FORITER expects an iterator on the stack. If you jump to the end of the loop from the middle of an assignment operator and skip say STOREFAST, you will left an arbitrary value on the stack. This can lead to unpredictable consequences.
Well, probably OT but the solution for that would be to stop using a local stack and instead use explicit addressing.
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