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use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use rtic_syntax::{ast::App, Context};
use crate::codegen::util;
/// Generates local resources structs
pub fn codegen(ctxt: Context, needs_lt: &mut bool, app: &App) -> (TokenStream2, TokenStream2) {
let mut lt = None;
let resources = match ctxt {
Context::Init => &app.init.args.local_resources,
Context::Idle => &app.idle.as_ref().unwrap().args.local_resources,
Context::HardwareTask(name) => &app.hardware_tasks[name].args.local_resources,
Context::SoftwareTask(name) => &app.software_tasks[name].args.local_resources,
};
let mut fields = vec![];
let mut values = vec![];
let mut has_cfgs = false;
for (name, task_local) in resources {
let res = app.local_resources.get(name).expect("UNREACHABLE");
let cfgs = &res.cfgs;
has_cfgs |= !cfgs.is_empty();
let lt = if ctxt.runs_once() {
quote!('static)
} else {
lt = Some(quote!('a));
quote!('a)
};
let ty = &res.ty;
let mangled_name = util::mark_internal_ident(&util::static_local_resource_ident(name));
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt mut #ty
));
let expr = quote!(&mut *#mangled_name.get_mut_unchecked().as_mut_ptr());
values.push(quote!(
#(#cfgs)*
#name: #expr
));
}
if lt.is_some() {
*needs_lt = true;
// The struct could end up empty due to `cfg`s leading to an error due to `'a` being unused
if has_cfgs {
fields.push(quote!(
#[doc(hidden)]
pub __marker__: core::marker::PhantomData<&'a ()>
));
values.push(quote!(__marker__: core::marker::PhantomData))
}
}
let doc = format!("Local resources `{}` has access to", ctxt.ident(app));
let ident = util::local_resources_ident(ctxt, app);
let ident = util::mark_internal_ident(&ident);
let item = quote!(
#[allow(non_snake_case)]
#[doc = #doc]
pub struct #ident<#lt> {
#(#fields,)*
}
);
let constructor = quote!(
impl<#lt> #ident<#lt> {
#[inline(always)]
pub unsafe fn new() -> Self {
#ident {
#(#values,)*
}
}
}
);
(item, constructor)
}
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