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|
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use rtic_syntax::{analyze::Ownership, ast::App, Context};
use crate::{analyze::Analysis, check::Extra, codegen::util};
/// Generate shared resources structs
pub fn codegen(
ctxt: Context,
needs_lt: &mut bool,
app: &App,
analysis: &Analysis,
extra: &Extra,
) -> (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().unwrap().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;
// Lock-all api related
let mut fields_mut = vec![];
let mut values_mut = vec![];
let mut max_ceiling = 0;
let mut field_get_prio = None;
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);
if !res.properties.lock_free {
lt = Some(quote!('a));
if access.is_shared() {
// [&x] (shared)
fields.push(quote!(
#(#cfgs)*
pub #name: &'a #ty
));
} else {
// Resource proxy
fields.push(quote!(
#(#cfgs)*
pub #name: shared_resources::#name<'a>
));
field_get_prio = Some(quote!(
#name
));
values.push(quote!(
#(#cfgs)*
#name: shared_resources::#name::new(priority)
));
// Lock-all related
fields_mut.push(quote!(
#(#cfgs)*
pub #name: &#lt mut #ty
));
values_mut.push(quote!(
#(#cfgs)*
#name: &mut *(&mut *#mangled_name.get_mut()).as_mut_ptr()
));
let ceiling = match analysis.ownerships.get(name) {
Some(Ownership::Owned { priority }) => *priority,
Some(Ownership::CoOwned { priority }) => *priority,
Some(Ownership::Contended { ceiling }) => *ceiling,
None => 0,
};
max_ceiling = std::cmp::max(ceiling, max_ceiling);
// continue as the value has been filled,
continue;
}
} else {
let lt = if ctxt.runs_once() {
quote!('static)
} else {
lt = Some(quote!('a));
quote!('a)
};
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt #mut_ #ty
));
}
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);
// Lock-all related
let doc_mut = format!(
"Shared resources `{}` has lock all access to",
ctxt.ident(app)
);
let ident_mut = util::shared_resources_ident_mut(ctxt, app);
let mut items = vec![];
items.push(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 (lock_all, new_struct, get_prio) = if let Some(name) = field_get_prio {
items.push(quote!(
// Used by the lock-all API
#[allow(non_snake_case)]
#[allow(non_camel_case_types)]
#[doc = #doc_mut]
pub struct #ident_mut<#lt> {
#(#fields_mut,)*
}
));
(
util::impl_mutex_struct(
extra,
&vec![], // TODO: what cfg should go here?
quote!(#ident),
quote!(#ident_mut<#lt>),
max_ceiling,
quote!(self.priority()),
quote!(|| { #ident_mut::new() }),
),
quote!(
// Used by the lock-all API
impl<#lt> #ident_mut<#lt> {
#[inline(always)]
pub unsafe fn new() -> Self {
#ident_mut {
#(#values_mut,)*
}
}
}
),
quote!(
// Used by the lock-all API
#[inline(always)]
pub unsafe fn priority(&self) -> &rtic::export::Priority {
self.#name.priority()
}
),
)
} else {
items.push(quote!(
// Used by the lock-all API
#[allow(non_snake_case)]
#[allow(non_camel_case_types)]
#[doc = #doc_mut]
pub struct #ident_mut {}
));
(quote!(), quote!(), quote!())
};
let implementations = quote!(
impl<#lt> #ident<#lt> {
#[inline(always)]
pub unsafe fn new(#arg) -> Self {
#ident {
#(#values,)*
}
}
#get_prio
}
#new_struct
#lock_all
);
(quote!(#(#items)*), implementations)
}
|
