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

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Date:	Mon, 01 Dec 2014 12:12:17 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	kernel-janitors@...r.kernel.org
CC:	Coccinelle <cocci@...teme.lip6.fr>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Determination for the number of named function parameters (with SmPL)

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
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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