This will work for some languages, but I very much doubt it'll work for at least two of the three languages mentioned (C# and Java) because even their native images often contain some kind of embedded runtime inside the executable.

I think you can compile both C# and Java to native code entirely (without a self-contained runtime) but it's not the common way to deploy executables written in those languages.

That said, I'm sure there are ways to get these statistics out of a .dll/.jar as well. Reasoning about them may be a little tough as you have no idea if the code will be JIT'ed or evaluated as bytecode until you run the code, but raw bytes on disk shouldn't pose a problem.

Worst case scenario, you can just dump the disassembled bytecode (https://stackoverflow.com/questions/11345034/how-many-bytes-... or https://stackoverflow.com/a/6574882) and start counting. Provided you don't add any native calls, of course, then you'll need to add objdump's transformed output as well.