Determing line number and file name of the perl file from within C++

Question

I am working with Perl embedded in our application. We have installed quite a few C++ functions that are called from within Perl. One of them is a logging function. I would like to add the file name and line number of the Perl file that called this function to the log message.
I know on the Perl side I can use the "caller()" function to get this information, but this function is already used in hundreds of locations, so I would prefer to modify the C++ side, is this information passed to the C++ XSUB functions and if so how would I get at it?

Thanks.

Answer 1

This should work:

char *file;
I32 line;

file = OutCopFILE(PL_curcop);
line = CopLINE(PL_curcop);

Control ops (cops) are one of the two ops OP_NEXTSTATE and op_DBSTATE, that (loosely speaking) are separate statements. They hold information important for lexical state and error reporting. At run time, PL_curcop is set to point to the most recently executed cop, and thus can be used to determine our current state.

— cop.h