Re: [Xen-devel] [PATCH v9 02/10] scripts: Coccinelle script to use ERRP_AUTO_PROPAGATE()

[Markus Armbruster <armbru@redhat.com>]

Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> writes:

> 13.03.2020 10:50, Markus Armbruster wrote:
>> Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> writes:
>>
>> [...]
>>> +// Warn several Error * definitions.
>>> +@check1 disable optional_qualifier exists@
>>> +identifier fn = rule1.fn, local_err, local_err2;
>>> +@@
>>> +
>>> + fn(..., Error ** ____, ...)
>>> + {
>>> +     ...
>>> +     Error *local_err = NULL;
>>> +     ... when any
>>> +     Error *local_err2 = NULL;
>>> +     ... when any
>>> + }
>>> +
>>> +@ script:python @
>>> +fn << check1.fn;
>>> +@@
>>> +
>>> +print('Warning: function {} has several definitions of '
>>> +      'Error * local variable'.format(fn))
>>
>> Printing the positions like you do in the next rule is useful when
>> examining these warnings.
>
> I decided that searching for Error * definition is simple, and better for
> user to search all definitions by hand (may be more than too).
>
> But understanding control flows is more complex thing and better to help
> user with line positions.
>
> But if you want, we can add them of course. Note, that for some reasons some
> times coccinelle instead of original filename prints something like /tmp/...original-name...
> so it don't look nice and may be a bit misleading.

I noticed when I actually tried mu idea %-}


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