bpo-42823: Update frame.f_lineno before any call to the (C) tracing function. #24150
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Minimizes breakage and ensures PyFrame_GetLineNumber is efficient.
This PR sets the C field
frame.f_lineno
to the actual line number before any call to a tracing function, and sets it back to zero after the call. This:frame.f_lineno
always holds same value as the Python attributePyFrame_GetLineNumber()
efficient, as it will not need to do any computation when called within a tracing function.Should have no effect when tracing is turned off.
https://bugs.python.org/issue42823