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Start working on host-side functions

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This commit is contained in:
Isaac Clayton 2022-06-08 18:17:38 +02:00
parent 71e0555763
commit 53e56f1284
5 changed files with 232 additions and 30 deletions
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74
crates/plugin_macros/src/lib.rs
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@ -5,15 +5,15 @@ use quote::{format_ident, quote};
use syn::{parse_macro_input, FnArg, ItemFn, Type, Visibility};
#[proc_macro_attribute]
pub fn bind(args: TokenStream, function: TokenStream) -> TokenStream {
pub fn export(args: TokenStream, function: TokenStream) -> TokenStream {
if !args.is_empty() {
panic!("The bind attribute does not take any arguments");
panic!("The export attribute does not take any arguments");
}
let inner_fn = parse_macro_input!(function as ItemFn);
if let Visibility::Public(_) = inner_fn.vis {
} else {
panic!("The bind attribute only works for public functions");
panic!("The export attribute only works for public functions");
}
let inner_fn_name = format_ident!("{}", inner_fn.sig.ident);
@ -53,6 +53,7 @@ pub fn bind(args: TokenStream, function: TokenStream) -> TokenStream {
#inner_fn
#[no_mangle]
// TODO: switch len from usize to u32?
pub extern "C" fn #outer_fn_name(ptr: *const u8, len: usize) -> *const ::plugin::__Buffer {
// setup
let buffer = ::plugin::__Buffer { ptr, len };
@ -73,3 +74,70 @@ pub fn bind(args: TokenStream, function: TokenStream) -> TokenStream {
}
})
}
#[proc_macro_attribute]
pub fn import(args: TokenStream, function: TokenStream) -> TokenStream {
todo!()
// if !args.is_empty() {
// panic!("The import attribute does not take any arguments");
// }
// let inner_fn = parse_macro_input!(function as ItemFn);
// let inner_fn_name = format_ident!("{}", inner_fn.sig.ident);
// // let outer_fn_name = format_ident!("__{}", inner_fn_name);
// let variadic = inner_fn.sig.inputs.len();
// let i = (0..variadic).map(syn::Index::from);
// let t: Vec<Type> = inner_fn
// .sig
// .inputs
// .iter()
// .map(|x| match x {
// FnArg::Receiver(_) => {
// panic!("all arguments must have specified types, no `self` allowed")
// }
// FnArg::Typed(item) => *item.ty.clone(),
// })
// .collect();
// // this is cursed...
// let (args, ty) = if variadic != 1 {
// (
// quote! {
// #( data.#i ),*
// },
// quote! {
// ( #( #t ),* )
// },
// )
// } else {
// let ty = &t[0];
// (quote! { data }, quote! { #ty })
// };
// TokenStream::from(quote! {
// #[no_mangle]
// #inner_fn
// #[no_mangle]
// pub extern "C" fn #outer_fn_name(ptr: *const u8, len: usize) -> *const ::plugin::__Buffer {
// // setup
// let buffer = ::plugin::__Buffer { ptr, len };
// let data = unsafe { buffer.to_vec() };
// // operation
// let data: #ty = match ::plugin::bincode::deserialize(&data) {
// Ok(d) => d,
// Err(e) => panic!("Data passed to function not deserializable."),
// };
// let result = #inner_fn_name(#args);
// let new_data: Result<Vec<u8>, _> = ::plugin::bincode::serialize(&result);
// let new_data = new_data.unwrap();
// // teardown
// let new_buffer = unsafe { ::plugin::__Buffer::from_vec(new_data) };
// return new_buffer.leak_to_heap();
// }
// })
}