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From: Joe Perches <joe@perches.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Julia Lawall <julia.lawall@lip6.fr>,
	cocci <cocci@systeme.lip6.fr>
Cc: Giuseppe Scrivano <gscrivan@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Andy Whitcroft <apw@shadowen.org>
Subject: [Cocci] coccinelle: Convert comma to semicolons (was Re: [PATCH] checkpatch: Add test for comma use that should be semicolon)
Date: Wed, 19 Aug 2020 16:07:23 -0700
Message-ID: <b0fd63e4b379eda69ee85ab098353582b8c054bb.camel@perches.com> (raw)
In-Reply-To: <3bf27caf462007dfa75647b040ab3191374a59de.camel@perches.com>

On Wed, 2020-08-19 at 14:22 -0700, Joe Perches wrote:
> There are commas used as statement terminations that should typically
> have used semicolons instead.  Only direct assignments or use of a single
> function or value on a single line are detected by this test.
> 
> e.g.:
> 	foo = bar(),		/* typical use is semicolon not comma */
> 	bar = baz();
> 
> Add an imperfect test to detect these comma uses.
> 
> No false positives were found in testing, but many types of false negatives
> are possible.
> 
> e.g.:
> 	foo = bar() + 1,	/* comma use, but not direct assignment */
> 	bar = baz();

Hi.

I recently added a test for this condition to linux's checkpatch.

A similar coccinelle script might be:

$ cat comma.cocci
@@
expression e1;
expression e2;
@@

	e1
-	,
+	;
	e2;
$

This works reasonably well but it has several false positives
for declarations like:

$ spatch --sp-file comma.cocci mm/huge_memory.c
diff -u -p a/huge_memory.c b/huge_memory.c
--- a/huge_memory.c
+++ b/huge_memory.c
@@ -2778,7 +2778,7 @@ static unsigned long deferred_split_scan
 	struct pglist_data *pgdata = NODE_DATA(sc->nid);
 	struct deferred_split *ds_queue = &pgdata->deferred_split_queue;
 	unsigned long flags;
-	LIST_HEAD(list), *pos, *next;
+	LIST_HEAD(list), *pos; *next;
 	struct page *page;
 	int split = 0;
$

Any script improvement suggestions?


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Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200818184107.f8af232fb58b17160c570874@linux-foundation.org>
     [not found] ` <3bf27caf462007dfa75647b040ab3191374a59de.camel@perches.com>
2020-08-19 23:07   ` Joe Perches [this message]
2020-08-20  8:33     ` Julia Lawall
2020-08-20 16:52       ` Joe Perches
2020-08-20 17:03         ` Julia Lawall
2020-08-20 17:28           ` Joe Perches
2020-08-22  1:08           ` Joe Perches
2020-08-22  3:35             ` Valdis Klētnieks
2020-08-22  5:30               ` Joe Perches
2020-08-22  7:07                 ` Julia Lawall
2020-09-24 20:19                   ` Thomas Gleixner
2020-09-24 20:21                     ` Julia Lawall
2020-09-24 20:33                     ` Joe Perches
2020-09-24 21:53                       ` Thomas Gleixner
2020-09-24 22:23                         ` Joe Perches
2020-09-25 17:06                           ` Julia Lawall
2020-09-25 17:26                             ` Joe Perches
2020-09-26 19:11                               ` Valdis Klētnieks
2020-09-27 17:08                           ` Julia Lawall
2020-09-27 17:45                             ` Joe Perches
2020-09-27 19:35                               ` Julia Lawall

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