linux-kernel - Re: Determination for the number of named function parameters (with SmPL)

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Date:	Tue, 2 Dec 2014 08:30:23 -0800
From:	Mark D Rustad <mrustad@...il.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	kernel-janitors@...r.kernel.org,
	Coccinelle <cocci@...teme.lip6.fr>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Determination for the number of named function parameters (with SmPL)

On Dec 1, 2014, at 3:12 AM, SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:

> Hello,
> 
> Would you like to know how many named function parameters are used in the source files?
> 
> How do you think about to try the following semantic query approach out a bit more?
> 
> @initialize:python@
> @@
> import sys
> import sqlite3 as SQLite
> connection = SQLite.connect(":memory:")
> c = connection.cursor()
> c.execute("""create table numbers (number integer)""")
> delimiter = "|"
> 
> def store_number(count):
>    """Add an integer to an internal list."""
>    c.execute("""insert into numbers (number) values (?)""",
>              (count, )
>             )
> 
> @counting_parameters@
> identifier work;
> parameter list[number] pl;
> type return_type;
> @@
> return_type work(pl)
> {
>  ...
> }
> 
> @script:python collection@
> count << counting_parameters.number;
> @@
> store_number(count)
> 
> @finalize:python@
> @@
> c.execute("""select count(*) nr from numbers""")
> result = c.fetchone()
> 
> if result[0] > 0:
>   c.execute("""create index x on numbers (number)""")
>   c.execute("select number, count(*) nr from numbers group by number")
>   sys.stdout.write(delimiter.join( ("number", "counter") ))
>   sys.stdout.write("\r\n")
>   for result in c:
>      sys.stdout.write(delimiter.join((str(result[0]),
>                                       str(result[1])
>                                      )))
>      sys.stdout.write("\r\n")
> else:
>   sys.stderr.write("No result for this analysis!\n")
> 
> connection.close()
> 
> 
> 
> elfring@...ne:~/Projekte/Coccinelle/Probe> XX=$(date) && spatch.opt -timeout 12 -sp-file list_parameter_numbers1.cocci -dir /usr/src/linux-stable > list_parameter_numbers1.txt 2> list_parameter_numbers1-errors.txt ; YY=$(date) && echo "$XX * $YY"
> ...
> elfring@...ne:~/Projekte/Coccinelle/Probe> cat list_parameter_numbers1.txt
> number|counter
> 0|29

I think the results are dubious. Only 29 functions with no parameters? That can't be right.

> 1|18261
> 2|15374
> 3|12237
> 4|8159
> 5|4339
> 6|2701
> 7|1183
> 8|518
> 9|260
> 10|146
> 11|83
> 12|42
> 13|21
> 14|9
> 15|7
> 16|2
> 17|4
> 18|1
> 21|1
> 22|1
> 
> 
> Do you find such an analysis result from the source files for Linux 3.17.4
> interesting for further considerations?
> 
> Regards,
> Markus
> --
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-- 
Mark Rustad, MRustad@...il.com


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