Macro cached_global_func 

macro_rules! cached_global_func {
    ($name:literal) => { ... };
}

Resolves a registered global Function by name and caches it for the lifetime of the process (lock-free after the first lookup). Each call site gets its own cache and the macro evaluates to a &'static Function. Panics — naming the function — if it is not registered.

Usage: cached_global_func!("ffi.Map").call_packed(args)