Coccinelle semantic patch to find misuses of PyDescr_NewMethod with respect to reference counters in cpython

cpython_leaks.cocci

@r exists@
local idexpression x;
expression e;
position p1,p2;
@@

x = PyDescr_NewMethod@p1(...)
... when != Py_INCREF(x)
   when != Py_XINCREF(x)
   when != Py_DECREF(x)
   when != Py_XDECREF(x)
   when != e = x
   when != true x == NULL
(
return <+...x...+>;
|
return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

cocci.print_main("call",p1)
cocci.print_secs("ret",p2)

I had gone through all you do DamienCassou,
well done. Can we join to work the project together?