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* [Cocci] Does coccinelle support non-standard C?
@ 2019-05-22 11:28 Christoph Böhmwalder
  2019-05-22 11:37 ` Julia Lawall
  0 siblings, 1 reply; 5+ messages in thread
From: Christoph Böhmwalder @ 2019-05-22 11:28 UTC (permalink / raw)
  To: cocci

Hi,

Consider the following snippet of C:


#define f() ({ puts("hello"); 0; })
int main()
{
     printf("%d\n", f());
}


It uses an expression statement in the definition of `f`, which is a gcc 
extension.

Now let's try to write a semantic patch to generate something like this:


@@
@@
- cocci_replace_this()
+ ({ puts("hello"); 0; })


With the C code as:


#define f() cocci_replace_this()
int main()
{
     printf("%d\n", f());
}


This prompts the following error message from spatch:


$ spatch --sp-file test.cocci test.c
init_defs_builtins: /usr/lib/coccinelle/standard.h
32 33
Fatal error: exception Failure("plus: parse error: \n = File 
\"test.cocci\", line 4, column 3,  charpos = 32\n    around = '{', whole 
content = + ({ puts(\"hello\"); 0; })\n")


Now here's my question: this obviously implies that coccinelle doesn't 
support expression statements (or any other non-standard C for that 
matter). Can I still somehow tell spatch to just replace it with this 
string of text instead of trying to parse it as C?

Thanks.

--
Regards,
Christoph
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-- links below jump to the message on this page --
2019-05-22 11:28 [Cocci] Does coccinelle support non-standard C? Christoph Böhmwalder
2019-05-22 11:37 ` Julia Lawall
2019-05-22 11:39   ` Christoph Böhmwalder
2019-05-22 11:55     ` Julia Lawall
2019-05-22 11:57       ` Christoph Böhmwalder

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