[Python-Dev] Add Py_REPLACE and Py_XREPLACE macros
storchaka at gmail.com
Sun Feb 16 21:10:40 CET 2014
16.02.14 02:05, Nick Coghlan написав(ла):
> It's also likely than many of these crashes could only be reproduced
> through incorrect usage of the C API.
Rather through queer or malicious usage of Python classes with strange
code in __del__.
> For example:
> Such that Py_CLEAR and Py_XCLEAR are equivalent to:
There is no Py_XCLEAR. Py_CLEAR itself checks its argument for NULL (as
Py_XDECREF and Py_XINCREF). And these names looks too cumbersome to me.
> While the name does suggest the macro will expand to:
> target = value;
> which isn't quite accurate, it's close enough that people should still
> be able to understand what the operation does.
This is not just inaccurate, this is wrong. Py_REPLACE first assigns new
value and then DECREF old value. So it rather can be named as
Py_SET_AND_DECREF, but of course this name looks ugly and confusing.
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