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#![feature(proc_macro_diagnostic)]
extern crate proc_macro;
use darling::FromMeta;
use proc_macro::{Span, TokenStream};
use quote::{format_ident, quote};
use syn::spanned::Spanned;
#[derive(Debug, FromMeta)]
struct MacroArgs {
#[darling(default)]
pool_size: Option<usize>,
#[darling(default)]
send: bool,
}
#[proc_macro_attribute]
pub fn task(args: TokenStream, item: TokenStream) -> TokenStream {
let macro_args = syn::parse_macro_input!(args as syn::AttributeArgs);
let mut task_fn = syn::parse_macro_input!(item as syn::ItemFn);
let macro_args = match MacroArgs::from_list(¯o_args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(e.write_errors());
}
};
let pool_size: usize = macro_args.pool_size.unwrap_or(1);
let mut fail = false;
if task_fn.sig.asyncness.is_none() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must be async")
.emit();
fail = true;
}
if !task_fn.sig.generics.params.is_empty() {
task_fn
.sig
.span()
.unwrap()
.error("task functions must not be generic")
.emit();
fail = true;
}
if pool_size < 1 {
Span::call_site()
.error("pool_size must be 1 or greater")
.emit();
fail = true
}
let mut arg_names: syn::punctuated::Punctuated<syn::Ident, syn::Token![,]> =
syn::punctuated::Punctuated::new();
let mut args = task_fn.sig.inputs.clone();
for arg in args.iter_mut() {
match arg {
syn::FnArg::Receiver(_) => {
arg.span()
.unwrap()
.error("task functions must not have receiver arguments")
.emit();
fail = true;
}
syn::FnArg::Typed(t) => match t.pat.as_mut() {
syn::Pat::Ident(i) => {
arg_names.push(i.ident.clone());
i.mutability = None;
}
_ => {
arg.span()
.unwrap()
.error("pattern matching in task arguments is not yet supporteds")
.emit();
fail = true;
}
},
}
}
if fail {
return TokenStream::new();
}
let name = task_fn.sig.ident.clone();
let visibility = &task_fn.vis;
task_fn.sig.ident = format_ident!("task");
let impl_ty = if macro_args.send {
quote!(impl ::core::future::Future + Send + 'static)
} else {
quote!(impl ::core::future::Future + 'static)
};
let result = quote! {
#visibility fn #name(#args) -> ::embassy::executor::SpawnToken<#impl_ty> {
use ::embassy::executor::raw::Task;
#task_fn
type F = #impl_ty;
const NEW_TASK: Task<F> = Task::new();
static POOL: [Task<F>; #pool_size] = [NEW_TASK; #pool_size];
unsafe { Task::spawn_pool(&POOL, move || task(#arg_names)) }
}
};
result.into()
}
#[proc_macro]
pub fn interrupt_declare(item: TokenStream) -> TokenStream {
let name = syn::parse_macro_input!(item as syn::Ident);
let name = format_ident!("{}", name);
let name_interrupt = format_ident!("{}", name);
let name_handler = format!("__EMBASSY_{}_HANDLER", name);
let result = quote! {
#[allow(non_camel_case_types)]
pub struct #name_interrupt(());
unsafe impl Interrupt for #name_interrupt {
type Priority = crate::interrupt::Priority;
fn number(&self) -> u16 {
use cortex_m::interrupt::InterruptNumber;
let irq = crate::pac::interrupt::#name;
irq.number() as u16
}
unsafe fn steal() -> Self {
Self(())
}
unsafe fn __handler(&self) -> &'static ::embassy::interrupt::Handler {
#[export_name = #name_handler]
static HANDLER: ::embassy::interrupt::Handler = ::embassy::interrupt::Handler::new();
&HANDLER
}
}
};
result.into()
}
#[proc_macro]
pub fn interrupt_take(item: TokenStream) -> TokenStream {
let name = syn::parse_macro_input!(item as syn::Ident);
let name = format!("{}", name);
let name_interrupt = format_ident!("{}", name);
let name_handler = format!("__EMBASSY_{}_HANDLER", name);
let result = quote! {
{
#[allow(non_snake_case)]
#[export_name = #name]
pub unsafe extern "C" fn trampoline() {
extern "C" {
#[link_name = #name_handler]
static HANDLER: ::embassy::interrupt::Handler;
}
let func = HANDLER.func.load(::embassy::export::atomic::Ordering::Acquire);
let ctx = HANDLER.ctx.load(::embassy::export::atomic::Ordering::Acquire);
if !func.is_null() {
let func: fn(*mut ()) = ::core::mem::transmute(func);
func(ctx)
}
}
static TAKEN: ::embassy::export::atomic::AtomicBool = ::embassy::export::atomic::AtomicBool::new(false);
if TAKEN.compare_exchange(false, true, ::embassy::export::atomic::Ordering::AcqRel, ::embassy::export::atomic::Ordering::Acquire).is_err() {
panic!("IRQ Already taken");
}
let irq: interrupt::#name_interrupt = unsafe { ::core::mem::transmute(()) };
irq
}
};
result.into()
}
|
