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macros: isolate the TAIT into its own mod.

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This fixes type inference issues due to the TAIT's defining scope
being the whole parent mod.
This commit is contained in:
Dario Nieuwenhuis 2022-04-25 22:18:52 +02:00
parent b27feb0619
commit c4cecec10c
1 changed files with 33 additions and 34 deletions
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67
embassy-macros/src/macros/task.rs
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@ -10,12 +10,10 @@ struct Args {
#[darling(default)]
pool_size: Option<usize>,
#[darling(default)]
send: bool,
#[darling(default)]
embassy_prefix: ModulePrefix,
}
pub fn run(args: syn::AttributeArgs, mut f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
pub fn run(args: syn::AttributeArgs, f: syn::ItemFn) -> Result<TokenStream, TokenStream> {
let args = Args::from_list(&args).map_err(|e| e.write_errors())?;
let embassy_prefix = args.embassy_prefix.append("embassy");
@ -35,24 +33,27 @@ pub fn run(args: syn::AttributeArgs, mut f: syn::ItemFn) -> Result<TokenStream,
ctxt.error_spanned_by(&f.sig, "pool_size must be 1 or greater");
}
let mut arg_names: syn::punctuated::Punctuated<syn::Ident, syn::Token![,]> =
syn::punctuated::Punctuated::new();
let mut arg_types = Vec::new();
let mut arg_names = Vec::new();
let mut arg_indexes = Vec::new();
let mut fargs = f.sig.inputs.clone();
for arg in fargs.iter_mut() {
for (i, arg) in fargs.iter_mut().enumerate() {
match arg {
syn::FnArg::Receiver(_) => {
ctxt.error_spanned_by(arg, "task functions must not have receiver arguments");
}
syn::FnArg::Typed(t) => match t.pat.as_mut() {
syn::Pat::Ident(i) => {
arg_names.push(i.ident.clone());
i.mutability = None;
syn::Pat::Ident(id) => {
arg_names.push(id.ident.clone());
arg_types.push(t.ty.clone());
arg_indexes.push(syn::Index::from(i));
id.mutability = None;
}
_ => {
ctxt.error_spanned_by(
arg,
"pattern matching in task arguments is not yet supporteds",
"pattern matching in task arguments is not yet supported",
);
}
},
@ -63,40 +64,38 @@ pub fn run(args: syn::AttributeArgs, mut f: syn::ItemFn) -> Result<TokenStream,
let task_ident = f.sig.ident.clone();
let task_inner_ident = format_ident!("__{}_task", task_ident);
let future_ident = format_ident!("__{}_Future", task_ident);
let pool_ident = format_ident!("__{}_POOL", task_ident);
let new_ts_ident = format_ident!("__{}_NEW_TASKSTORAGE", task_ident);
let mod_ident = format_ident!("__{}_mod", task_ident);
let args_ident = format_ident!("__{}_args", task_ident);
let visibility = &f.vis;
f.sig.ident = task_inner_ident.clone();
let impl_ty = if args.send {
quote!(impl ::core::future::Future + Send + 'static)
} else {
quote!(impl ::core::future::Future + 'static)
};
let attrs = &f.attrs;
let spawn_token = quote!(#embassy_path::executor::SpawnToken);
let task_storage = quote!(#embassy_path::executor::raw::TaskStorage);
let mut task_inner = f;
let visibility = task_inner.vis.clone();
task_inner.vis = syn::Visibility::Inherited;
task_inner.sig.ident = task_inner_ident.clone();
let result = quote! {
#task_inner
#[allow(non_camel_case_types)]
type #future_ident = #impl_ty;
type #args_ident = (#(#arg_types,)*);
#(#attrs)*
#visibility fn #task_ident(#fargs) -> #spawn_token<#future_ident> {
#f
mod #mod_ident {
use #embassy_path::executor::SpawnToken;
use #embassy_path::executor::raw::TaskStorage;
type Fut = impl ::core::future::Future + 'static;
#[allow(non_upper_case_globals)]
#[allow(clippy::declare_interior_mutable_const)]
const #new_ts_ident: #task_storage<#future_ident> = #task_storage::new();
const NEW_TS: TaskStorage<Fut> = TaskStorage::new();
#[allow(non_upper_case_globals)]
static #pool_ident: [#task_storage<#future_ident>; #pool_size] = [#new_ts_ident; #pool_size];
static POOL: [TaskStorage<Fut>; #pool_size] = [NEW_TS; #pool_size];
unsafe { #task_storage::spawn_pool(&#pool_ident, move || #task_inner_ident(#arg_names)) }
pub(super) fn task(args: super::#args_ident) -> SpawnToken<Fut> {
unsafe { TaskStorage::spawn_pool(&POOL, move || super::#task_inner_ident(#(args.#arg_indexes),*)) }
}
}
#visibility fn #task_ident(#fargs) -> #embassy_path::executor::SpawnToken<impl ::core::future::Future + 'static> {
#mod_ident::task((#(#arg_names,)*))
}
};