rust/macros/export.rs

// SPDX-License-Identifier: GPL-2.0

use proc_macro2::TokenStream;
use quote::quote;

/// Please see [`crate::export`] for documentation.
pub(crate) fn export(f: syn::ItemFn) -> TokenStream {
    let name = &f.sig.ident;

    quote! {
        // This verifies that the function has the same signature as the declaration generated by
        // bindgen. It makes use of the fact that all branches of an if/else must have the same
        // type.
        const _: () = {
            if true {
                ::kernel::bindings::#name
            } else {
                #name
            };
        };

        #[no_mangle]
        #f
    }
}