[P4-dev] extern function return in backend

hemant at mnkcg.com hemant at mnkcg.com
Fri Oct 20 11:57:34 EDT 2017


The extern below has a function returning bool.  The args of the function
are not relevant to my question and thus are replaced with ellipses.

 

extern myExtern {

       myExtern();

       bool compare(.);

};

 

I know args to an extern function are obtained by backend software as
follows, such as getting the first arg:

 

method->expr->arguments->at(0);

 

How does one get the bool returned from the function in backend to see if
the frontend P4 program used "!extvar.compare()" or "extvar.compare()"?

 

Hemant

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