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:
Py_CLEAR_AND_SET
Py_XCLEAR_AND_SET
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:
Py_CLEAR(target);
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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