Started work

1 files changed, 146 insertions, 0 deletions

diff --git a/macros/src/codegen/local_resources.rs b/macros/src/codegen/local_resources.rs
new file mode 100644
index 00000000..dd3cbb44
--- /dev/null
+++ b/macros/src/codegen/local_resources.rs
@@ -0,0 +1,146 @@
+use proc_macro2::TokenStream as TokenStream2;
+use quote::quote;
+use rtic_syntax::{analyze::Ownership, ast::App};
+
+use crate::{analyze::Analysis, check::Extra, codegen::util};
+
+/// Generates `local` variables and local resource proxies
+pub fn codegen(
+    app: &App,
+    analysis: &Analysis,
+    extra: &Extra,
+) -> (
+    // mod_app -- the `static` variables behind the proxies
+    Vec<TokenStream2>,
+    // mod_resources -- the `resources` module
+    TokenStream2,
+) {
+    let mut mod_app = vec![];
+    let mut mod_resources = vec![];
+
+    for (name, res) in app.local_resources {
+        // let expr = &res.expr; // TODO: Extract from tasks???...
+        let cfgs = &res.cfgs;
+        let ty = &res.ty;
+        let mangled_name = util::mark_internal_ident(&name);
+
+        {
+            // late resources in `util::link_section_uninit`
+            let section = if expr.is_none() {
+                util::link_section_uninit(true)
+            } else {
+                None
+            };
+
+            // resource type and assigned value
+            let (ty, expr) = if let Some(expr) = expr {
+                // early resource
+                (
+                    quote!(rtic::RacyCell<#ty>),
+                    quote!(rtic::RacyCell::new(#expr)),
+                )
+            } else {
+                // late resource
+                (
+                    quote!(rtic::RacyCell<core::mem::MaybeUninit<#ty>>),
+                    quote!(rtic::RacyCell::new(core::mem::MaybeUninit::uninit())),
+                )
+            };
+
+            let attrs = &res.attrs;
+
+            // For future use
+            // let doc = format!(" RTIC internal: {}:{}", file!(), line!());
+            mod_app.push(quote!(
+                #[allow(non_upper_case_globals)]
+                // #[doc = #doc]
+                #[doc(hidden)]
+                #(#attrs)*
+                #(#cfgs)*
+                #section
+                static #mangled_name: #ty = #expr;
+            ));
+        }
+
+        let r_prop = &res.properties;
+        // For future use
+        // let doc = format!(" RTIC internal: {}:{}", file!(), line!());
+
+        if !r_prop.task_local && !r_prop.lock_free {
+            mod_resources.push(quote!(
+                // #[doc = #doc]
+                #[doc(hidden)]
+                #[allow(non_camel_case_types)]
+                #(#cfgs)*
+                pub struct #name<'a> {
+                    priority: &'a Priority,
+                }
+
+                #(#cfgs)*
+                impl<'a> #name<'a> {
+                    #[inline(always)]
+                    pub unsafe fn new(priority: &'a Priority) -> Self {
+                        #name { priority }
+                    }
+
+                    #[inline(always)]
+                    pub unsafe fn priority(&self) -> &Priority {
+                        self.priority
+                    }
+                }
+            ));
+
+            let (ptr, _doc) = if expr.is_none() {
+                // late resource
+                (
+                    quote!(
+                        #(#cfgs)*
+                        #mangled_name.get_mut_unchecked().as_mut_ptr()
+                    ),
+                    "late",
+                )
+            } else {
+                // early resource
+                (
+                    quote!(
+                        #(#cfgs)*
+                        #mangled_name.get_mut_unchecked()
+                    ),
+                    "early",
+                )
+            };
+
+            let ceiling = match analysis.ownerships.get(name) {
+                Some(Ownership::Owned { priority }) => *priority,
+                Some(Ownership::CoOwned { priority }) => *priority,
+                Some(Ownership::Contended { ceiling }) => *ceiling,
+                None => 0,
+            };
+
+            // For future use
+            // let doc = format!(" RTIC internal ({} resource): {}:{}", doc, file!(), line!());
+
+            mod_app.push(util::impl_mutex(
+                extra,
+                cfgs,
+                true,
+                name,
+                quote!(#ty),
+                ceiling,
+                ptr,
+            ));
+        }
+    }
+
+    let mod_resources = if mod_resources.is_empty() {
+        quote!()
+    } else {
+        quote!(mod resources {
+            use rtic::export::Priority;
+
+            #(#mod_resources)*
+        })
+    };
+
+    (mod_app, mod_resources)
+}