the openg libraries are 'compatible with labview' which meets these standards: https://decibel.ni.com/content/docs/DOC-8981 but otherwise, no clue. Definitely a weird requirement.
Depending on the specific requirements, you might be able to focus in the restriction by only using code which uses native labview functions (ie no CLFN/dll calls). Then you can figure out what types of malicious things labview could do -- for example, file IO functions are probably out, as would be any code which uses VI server (could call other code dynamically). These are both pretty easy to verify. From the product page this leaves you:
-Array manipulation
-String manipulation -Application control -File handling
-Zip files
-Timing tools
-MD5 digest implementation
-Error handling
-Variant and flattened data manipulation
Still a pretty good set of tools and I can't think of any way this could affect other machines in a malicious way. Of course if the definition is 'you must inspect every function'...well, have fun