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use syn::{Data, DeriveInput, parse_macro_input};
#[proc_macro_derive(BpfApp, attributes(license, hashmap, array_percpu, ringbuf, prog))]
pub fn derive_bpf_app(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let DeriveInput { ident, data, .. } = parse_macro_input!(input as DeriveInput);
struct UserTokens<T> {
map_cnt: T,
prog_cnt: T,
new_field: T,
map_step: T,
prog_step: T,
}
let ut = UserTokens {
map_cnt: quote::quote! {},
prog_cnt: quote::quote! {},
new_field: quote::quote! {},
map_step: quote::quote! {},
prog_step: quote::quote! {},
};
let ut = match data {
Data::Struct(data) => data.fields.into_iter().fold(ut, |ut, field| {
let UserTokens {
map_cnt,
prog_cnt,
new_field,
map_step,
prog_step,
} = ut;
let val = field.ident.unwrap();
let val_str = format!("{}\0", val);
let ty = field.ty;
UserTokens {
map_cnt: quote::quote! { #map_cnt + <#ty as ebpf_user::kind::AppItem>::MAP },
prog_cnt: quote::quote! { #prog_cnt + <#ty as ebpf_user::kind::AppItem>::PROG },
new_field: quote::quote! { #new_field #val: <#ty>::named(#val_str), },
map_step: quote::quote! {
#map_step
if let ebpf_user::kind::AppItemKindMut::Map(v) = self.#val.kind_mut() {
if counter == index {
return Some(v);
} else {
counter += 1;
}
}
},
prog_step: quote::quote! {
#prog_step
if let ebpf_user::kind::AppItemKindMut::Prog(v) = self.#val.kind_mut() {
if counter == index {
return Some(v);
} else {
counter += 1;
}
}
},
}
}),
_ => unimplemented!(),
};
let UserTokens {
map_cnt,
prog_cnt,
new_field,
map_step,
prog_step,
} = ut;
proc_macro::TokenStream::from(quote::quote! {
impl ebpf_user::BpfApp for #ident {
const MAP_CNT: usize = 0 #map_cnt;
const PROG_CNT: usize = 0 #prog_cnt;
fn instance() -> Self {
use ebpf_user::kind::AppItem;
#ident {
#new_field
}
}
fn as_mut_map(&mut self, index: usize) -> Option<&mut ebpf_user::MapRef> {
use ebpf_user::kind::AppItem;
let mut counter = 0;
#map_step
let _ = counter;
None
}
fn as_mut_prog(&mut self, index: usize) -> Option<&mut ebpf_user::ProgRef> {
use ebpf_user::kind::AppItem;
let mut counter = 0;
#prog_step
let _ = counter;
None
}
}
})
}