linux-kernel - Re: [PATCH] checkpatch: Warn on macros with flow control statements

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Date:	Wed, 10 Sep 2014 07:36:40 -0700
From:	Joe Perches <joe@...ches.com>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	devel@...verdev.osuosl.org,
	"Dilger, Andreas" <andreas.dilger@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peng Tao <bergwolf@...il.com>, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Drokin, Oleg" <oleg.drokin@...el.com>,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] checkpatch: Warn on macros with flow control statements

On Wed, 2014-09-10 at 16:06 +0200, Julia Lawall wrote:
> On Wed, 10 Sep 2014, Joe Perches wrote:
> > On Wed, 2014-09-10 at 11:43 +0300, Dan Carpenter wrote:
> > > On Tue, Sep 09, 2014 at 01:38:13PM -0700, Joe Perches wrote:
> > > > Macros with flow control statements (goto and return) are
> > > > not very nice to read as any flow movement is unexpected.
> >
> > break and continue are also flow control statements
> > but are those are frequently used in macros in
> > complete switch statements so were not added.
> 
> Would it be possible to make a warning when there is a break or continue
> but no while/switch/etc.

I suppose the has_flow_statement could be extended.

Maybe something like:

			if ($ctx =~ /\b(goto|return|break|continue)\b/ &&
			    $ctx !~ /\b(switch|if|do|while)\b/) {
				has_flow_statement = 1;
			}

but checkpatch isn't really capable  of doing proper
flow logic analysis.

I'm not sure it's worthwhile.



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