[R-pkg-devel] User defined RNG and code registration.

? Sat, 23 Sep 2023 08:42:25 +0000
Ralf Stubner <ralf.stubner at gmail.com> ?????:

?Random.user describes a way to hook a user- defined
RNG into R. However, it looks like these two things are not
compatible, i.e. `user_unif_rand` et al. are not found, if dynamic
symbols are not allowed.

You're right! Looking at the code, if R_useDynamicSymbols(dll, FALSE)
has been called for a DLL, the branch that calls dlsym() or
GetProcAddress() to find symbols from that library by their shared
object symbol names gets completely disabled; only the registered
function names known to R matter at this point.

Or can one register these routines somehow even though they are not
following one of the standard calling conventions?

It sounds unsatisfying, but if you register your user_unif_rand
function with the right name and any of the ABIs supported by R, it
sounds like it should work as long as you never call it using the
.Call/.C/.Fortran ABI it's registered for.

Best regards,
Ivan