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|
use crate::syntax::{ast::App, Context};
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use crate::codegen::util;
/// Generate shared 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 => unreachable!("Tried to generate shared resources struct for init"),
Context::Idle => {
&app.idle
.as_ref()
.expect("RTIC-ICE: unable to get idle name")
.args
.shared_resources
}
Context::HardwareTask(name) => &app.hardware_tasks[name].args.shared_resources,
Context::SoftwareTask(name) => &app.software_tasks[name].args.shared_resources,
};
let mut fields = vec![];
let mut values = vec![];
let mut has_cfgs = false;
for (name, access) in resources {
let res = app.shared_resources.get(name).expect("UNREACHABLE");
let cfgs = &res.cfgs;
has_cfgs |= !cfgs.is_empty();
// access hold if the resource is [x] (exclusive) or [&x] (shared)
let mut_ = if access.is_exclusive() {
Some(quote!(mut))
} else {
None
};
let ty = &res.ty;
let mangled_name = util::static_shared_resource_ident(name);
let shared_name = util::need_to_lock_ident(name);
if res.properties.lock_free {
// Lock free resources of `idle` and `init` get 'static lifetime
let lt = if ctxt.runs_once() {
quote!('static)
} else {
lt = Some(quote!('a));
quote!('a)
};
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt #mut_ #ty
));
} else if access.is_shared() {
lt = Some(quote!('a));
fields.push(quote!(
#(#cfgs)*
pub #name: &'a #ty
));
} else {
// Resource proxy
lt = Some(quote!('a));
fields.push(quote!(
#(#cfgs)*
pub #name: shared_resources::#shared_name<'a>
));
values.push(quote!(
#(#cfgs)*
#name: shared_resources::#shared_name::new(priority)
));
// continue as the value has been filled,
continue;
}
let expr = if access.is_exclusive() {
quote!(&mut *(&mut *#mangled_name.get_mut()).as_mut_ptr())
} else {
quote!(&*(&*#mangled_name.get()).as_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!("Shared resources `{}` has access to", ctxt.ident(app));
let ident = util::shared_resources_ident(ctxt, app);
let item = quote!(
#[allow(non_snake_case)]
#[allow(non_camel_case_types)]
#[doc = #doc]
pub struct #ident<#lt> {
#(#fields,)*
}
);
let arg = if ctxt.is_init() {
None
} else {
Some(quote!(priority: &#lt rtic::export::Priority))
};
let constructor = quote!(
impl<#lt> #ident<#lt> {
#[inline(always)]
pub unsafe fn new(#arg) -> Self {
#ident {
#(#values,)*
}
}
}
);
(item, constructor)
}
|
