[Cocci] How to use coccinelle as a kind of grep -l ?

[Cocci] How to use coccinelle as a kind of grep -l ?

[Francois Berenger]

Hello,

Inside of applying any patch, I need to use coccinelle
in order to detect certain C files that match a given pattern
in a source code tree.

Is it possible to use coccinelle for that, how?

-- 
Regards,
Francois.

[Cocci] How to use coccinelle as a kind of grep -l ?

[Francois Berenger]

On 12/01/2014 11:12 AM, Francois Berenger wrote:
> Hello,
>

Instead of applying ...

> Inside of applying any patch, I need to use coccinelle
> in order to detect certain C files that match a given pattern
> in a source code tree.
>
> Is it possible to use coccinelle for that, how?
>

-- 
Regards,
Francois.

[Cocci] How to use coccinelle as a kind of grep -l ?

[Nicholas Mc Guire]

On Mon, 01 Dec 2014, Francois Berenger wrote:

> On 12/01/2014 11:12 AM, Francois Berenger wrote:
>> Hello,
>>
>
> Instead of applying ...
>
>> Inside of applying any patch, I need to use coccinelle
>> in order to detect certain C files that match a given pattern
>> in a source code tree.
>>
>> Is it possible to use coccinelle for that, how?
>>
>
here is a simple (hopefuly correct) example of a scanner - that will look
for inbalanced use of spinlocks and bh disable/enable - it reports one 
line per file that matches giving the name and line-numbers of the 
potentially inballanced calls. 


@r1@                                                                            
identifier f;
expression E;
position p1,p2,p3;
@@
f(...) {
<...
(
spin_lock_bh(E)@p1;
...
spin_unlock(E)@p2;
...
local_bh_enable()@p3;
|
local_bh_disable()@p2;
...
spin_lock(E)@p3;
...
spin_unlock_bh(E)@p1;
)
...>
}

@script:python@
p1 << r1.p1;
p2 << r1.p2;
p3 << r1.p3;
@@
print "file:%s at lines %s %s %s" % (p1[0].file,p1[0].line, p2[0].line, p3[0].line)


put this in a file called scan.cocci and running with the below command 
gives me:

hofrat at debian:/usr/src/linux-next$ spatch --cocci-file /tmp/scan.cocci --dir net/core/
HANDLING: net/core/datagram.c
HANDLING: net/core/netpoll.c
...
HANDLING: net/core/sock.c
file:net/core/sock.c at lines 2396 2406 2411
file:net/core/sock.c@lines 2346 2350 2355
...


thx!
hofrat

[Cocci] How to use coccinelle as a kind of grep -l ?

[Julia Lawall]

On Mon, 1 Dec 2014, Francois Berenger wrote:

> Hello,
> 
> Inside of applying any patch, I need to use coccinelle
> in order to detect certain C files that match a given pattern
> in a source code tree.
> 
> Is it possible to use coccinelle for that, how?

Yes.  One way is to put * on the lines of interest, in place of - or +.  
Then you will get a diff in which the matched lines of interest are marked 
with -.  With emacs diff mode, you can jump from the diff to the context 
in the source file.

Another way is to use position variables and use ocaml or python to print 
a message indicating wher you found whatever is of interest.

You can find many examples of both uses in the examples in the Linux 
kernel source tree, in the scripts/coccinelle subdirectory.

julia

> 
> -- 
> Regards,
> Francois.
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