[cfe-dev] Weird behavior while parsing nested (and non) pragmas

[Simone Pellegrini]

Hi there,
I have a question about a weird behavior I am observing when parsing C 
programs which contains nested pragmas.

The bottom line is that I need to extend some of the functions in Sema 
in order to associate the pragmas to the correct statement. Let's 
consider now the following code:

1 int main() {
2    #pragma omp parallel
3    {
4        #pragma omp barrier
5        #pragma omp master
6        ;
7    }
8 }

my overloaded version of ActOnCompoundStmt(SourceLocation lbrac, 
SourceLocation rbrac, ...) is called every time a block is consumed, 
when I try to print the location of the left bracket and the right 
bracket I obtain something weird:

1) ActOnCompoundStmt() -> left bracket 5:4, right bracket 7:2 (line:column)
2) ActOnCompoundStmt() -> left bracket 2:22, right bracket 8:1

Naturally 1 is referred to the inner compound stmt while 2 to the main 
body. As you see, the location of the left bracket is not correct, is 
this an intended behavior or I am doing something wrong. I have to say, 
to be complete, that in order to parse the pragmas I manually call the 
ConsumeToken() of the Parser class, could be this the problem?

cheers, Simone