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From: Julia Lawall <julia.lawall@lip6.fr>
To: Markus Elfring <Markus.Elfring@web.de>
Cc: Yi Wang <wang.yi59@zte.com.cn>,
	Michal Marek <michal.lkml@markovi.net>,
	Nicolas Palix <nicolas.palix@imag.fr>,
	linux-kernel@vger.kernel.org, Wen Yang <wen.yang99@zte.com.cn>,
	cocci@systeme.lip6.fr
Subject: Re: [Cocci] [4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses
Date: Tue, 14 May 2019 08:52:54 +0200 (CEST)
Message-ID: <alpine.DEB.2.21.1905140849570.2567@hadrien> (raw)
In-Reply-To: <4116e083-9e21-62d7-10b7-5cb26594144c@web.de>



On Tue, 14 May 2019, Markus Elfring wrote:

> >> A SmPL ellipsis was specified for a search approach so that additional
> >> source code would be tolerated between an assignment to a local variable
> >> and the corresponding null pointer check.
> >>
> >> But such code should be restricted.
> >> * The local variable must not be reassigned there.
> >> * It must also not be forwarded to an other assignment target.
> >>
> >> Take additional casts for these code exclusion specifications into account
> >> together with optional parentheses.
> >
> > NACK.
>
> Can you agree to any information which I presented in the commit message?
>
>
> > You don't need so many type metavariables.
>
> It seems that the Coccinelle software can cope also with my SmPL code addition.
> You might feel uncomfortable with the suggested changes for a while.

It's ugly.  Much more ugly than msg =

>
>
> > Type metavariables in the same ... can be the same.
>
> Such information is good to know for the proper usage of specifications
> after a SmPL ellipsis.
>
> * Can it become required to identify involved source code placeholders
>   by extra metavariables?

I don't understand the question.

> * Would you like to clarify the probability any more how often the shown
>   type casts will be identical?

No idea about this one either.

Basically, if you have T && T, the two T's have to be the same, and T is
not pure.  If you have T || T, then only one will be matched and T remains
pure.  If you have T on two separate ...s then you are in the && case.  If
you have T in two branches of a disjunction or in two whens on the same
... you are in the || case.  Just as you can use the variable e1 over and
over on the same when, you can use the same T.

julia
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Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-23  6:14 [Cocci] [PATCH] coccinelle: put_device: reduce false positives Wen Yang
2019-03-23 13:41 ` Julia Lawall
2019-03-23 19:44 ` Markus Elfring
2019-03-23 20:06   ` Julia Lawall
2019-03-26  8:45     ` Dan Carpenter
2019-03-26  9:38       ` Julia Lawall
2019-03-26 10:11         ` Dan Carpenter
2019-03-26 10:15           ` Julia Lawall
2019-03-28 13:08             ` Masahiro Yamada
2019-03-28 14:19               ` Julia Lawall
2019-04-01  6:44               ` [Cocci] Coccinelle: " Markus Elfring
2019-04-01 20:04                 ` Julia Lawall
2019-05-13  8:55 ` [Cocci] [PATCH 0/5] Coccinelle: put_device: Adjustments for a SmPL script Markus Elfring
2019-05-13  8:59   ` [Cocci] [PATCH 1/5] Coccinelle: put_device: Adjust a message construction Markus Elfring
2019-05-13  9:35     ` Julia Lawall
2019-05-13 11:33       ` [Cocci] [1/5] " Markus Elfring
2019-05-13 11:36         ` Julia Lawall
2019-05-13 12:48           ` Markus Elfring
2019-07-06 13:13     ` [Cocci] [PATCH 1/5] " Masahiro Yamada
2019-05-13  9:01   ` [Cocci] [PATCH 2/5] Coccinelle: put_device: Add a cast to an expression for an assignment Markus Elfring
2019-05-13  9:33     ` Julia Lawall
2019-07-06 13:13     ` Masahiro Yamada
2019-05-13  9:05   ` [Cocci] [PATCH 3/5] Coccinelle: put_device: Merge four SmPL when constraints into one Markus Elfring
2019-05-13  9:32     ` Julia Lawall
2019-05-13 11:48       ` [Cocci] [3/5] " Markus Elfring
2019-05-13 11:48       ` Markus Elfring
2019-05-13 11:51         ` Julia Lawall
2019-05-13 12:52           ` Markus Elfring
2019-05-13  9:07   ` [Cocci] [PATCH 4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses Markus Elfring
2019-05-13  9:31     ` Julia Lawall
2019-05-13 12:22       ` [Cocci] [4/5] " Markus Elfring
2019-05-14  5:55       ` Markus Elfring
2019-05-14  6:52         ` Julia Lawall [this message]
2019-05-14  7:49           ` Markus Elfring
2019-05-14  9:18             ` [Cocci] [4/5] Coccinelle: put_device: Extend when constraints for twoSmPL ellipses wen.yang99
2019-05-14  9:51               ` Markus Elfring
2019-05-14  7:49           ` [Cocci] [4/5] Coccinelle: put_device: Extend when constraints for two SmPL ellipses Markus Elfring
2019-05-13  9:07   ` [Cocci] [PATCH 4/5] " Markus Elfring
2019-05-13  9:10   ` [Cocci] [PATCH 5/5] Coccinelle: put_device: Merge two SmPL when constraints into one Markus Elfring
2019-05-13  9:30     ` Julia Lawall
2019-05-13 12:35       ` [Cocci] [5/5] " Markus Elfring

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