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|
use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use rtfm_syntax::{ast::App, Context};
use crate::{analyze::Analysis, codegen::util};
// TODO need to do something different when generators are involved
pub fn codegen(
ctxt: Context,
priority: u8,
needs_lt: &mut bool,
app: &App,
analysis: &Analysis,
) -> (TokenStream2, TokenStream2) {
let mut lt = None;
let resources = match ctxt {
Context::Init(core) => &app.inits[&core].args.resources,
Context::Idle(core) => &app.idles[&core].args.resources,
Context::HardwareTask(name) => &app.hardware_tasks[name].args.resources,
Context::SoftwareTask(name) => &app.software_tasks[name].args.resources,
};
let mut fields = vec![];
let mut values = vec![];
let mut has_cfgs = false;
for (name, access) in resources {
let (res, expr) = app.resource(name).expect("UNREACHABLE");
let cfgs = &res.cfgs;
has_cfgs |= !cfgs.is_empty();
let mut_ = if access.is_exclusive() {
Some(quote!(mut))
} else {
None
};
let ty = &res.ty;
if ctxt.is_init() {
if !analysis.ownerships.contains_key(name) {
// owned by `init`
fields.push(quote!(
#(#cfgs)*
pub #name: &'static #mut_ #ty
));
values.push(quote!(
#(#cfgs)*
#name: &#mut_ #name
));
} else {
// owned by someone else
lt = Some(quote!('a));
fields.push(quote!(
#(#cfgs)*
pub #name: &'a mut #ty
));
values.push(quote!(
#(#cfgs)*
#name: &mut #name
));
}
} else if ctxt.is_generator(app) {
let ownership = &analysis.ownerships[name];
if ownership.needs_lock(priority) {
if mut_.is_none() {
// mod gresourcesd
unimplemented!()
} else {
// resource proxy
fields.push(quote!(
#(#cfgs)*
pub #name: gresources::#name
));
values.push(quote!(
#(#cfgs)*
#name: gresources::#name::new()
));
continue;
}
} else {
let lt = if ctxt.runs_once(app) {
quote!('static)
} else {
lt = Some(quote!('a));
quote!('a)
};
if ownership.is_owned() || mut_.is_none() {
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt #mut_ #ty
));
} else {
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt mut #ty
));
}
}
let is_late = expr.is_none();
if is_late {
let expr = if mut_.is_some() {
quote!(&mut *#name.as_mut_ptr())
} else {
quote!(&*#name.as_ptr())
};
values.push(quote!(
#(#cfgs)*
#name: #expr
));
} else {
values.push(quote!(
#(#cfgs)*
#name: &#mut_ #name
));
}
} else {
let ownership = &analysis.ownerships[name];
if ownership.needs_lock(priority) {
if mut_.is_none() {
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: resources::#name<'a>
));
values.push(quote!(
#(#cfgs)*
#name: resources::#name::new(priority)
));
continue;
}
} else {
let lt = if ctxt.runs_once(app) {
quote!('static)
} else {
lt = Some(quote!('a));
quote!('a)
};
if ownership.is_owned() || mut_.is_none() {
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt #mut_ #ty
));
} else {
fields.push(quote!(
#(#cfgs)*
pub #name: &#lt mut #ty
));
}
}
let is_late = expr.is_none();
if is_late {
let expr = if mut_.is_some() {
quote!(&mut *#name.as_mut_ptr())
} else {
quote!(&*#name.as_ptr())
};
values.push(quote!(
#(#cfgs)*
#name: #expr
));
} else {
values.push(quote!(
#(#cfgs)*
#name: &#mut_ #name
));
}
}
}
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 core = ctxt.core(app);
let cores = app.args.cores;
let cfg_core = util::cfg_core(core, cores);
let doc = format!("Resources `{}` has access to", ctxt.ident(app));
let ident = util::resources_ident(ctxt, app);
let item = quote!(
#cfg_core
#[allow(non_snake_case)]
#[doc = #doc]
pub struct #ident<#lt> {
#(#fields,)*
}
);
let arg = if ctxt.is_init() || ctxt.is_generator(app) {
None
} else {
Some(quote!(priority: &#lt rtfm::export::Priority))
};
let constructor = quote!(
#cfg_core
impl<#lt> #ident<#lt> {
#[inline(always)]
unsafe fn new(#arg) -> Self {
#ident {
#(#values,)*
}
}
}
);
(item, constructor)
}
|
