1 files changed, 112 insertions, 0 deletions
diff --git a/macros/src/codegen/init.rs b/macros/src/codegen/init.rs
new file mode 100644
index 00000000..271be94c
--- /dev/null
+++ b/macros/src/codegen/init.rs
@@ -0,0 +1,112 @@
+use proc_macro2::TokenStream as TokenStream2;
+use quote::quote;
+use rtfm_syntax::{ast::App, Context};
+
+use crate::{
+    analyze::Analysis,
+    check::Extra,
+    codegen::{locals, module, resources_struct, util},
+};
+
+/// Generates support code for `#[init]` functions
+pub fn codegen(
+    core: u8,
+    app: &App,
+    analysis: &Analysis,
+    extra: &Extra,
+) -> (
+    // const_app_idle -- the `${init}Resources` constructor
+    Option<TokenStream2>,
+    // root_init -- items that must be placed in the root of the crate:
+    // - the `${init}Locals` struct
+    // - the `${init}Resources` struct
+    // - the `${init}LateResources` struct
+    // - the `${init}` module, which contains types like `${init}::Context`
+    Vec<TokenStream2>,
+    // user_init -- the `#[init]` function written by the user
+    Option<TokenStream2>,
+    // call_init -- the call to the user `#[init]` if there's one
+    Option<TokenStream2>,
+) {
+    if let Some(init) = app.inits.get(&core) {
+        let cfg_core = util::cfg_core(core, app.args.cores);
+        let mut needs_lt = false;
+        let name = &init.name;
+
+        let mut root_init = vec![];
+
+        let ret = {
+            let late_fields = analysis
+                .late_resources
+                .get(&core)
+                .map(|resources| {
+                    resources
+                        .iter()
+                        .map(|name| {
+                            let ty = &app.late_resources[name].ty;
+
+                            quote!(pub #name: #ty)
+                        })
+                        .collect::<Vec<_>>()
+                })
+                .unwrap_or(vec![]);
+
+            if !late_fields.is_empty() {
+                let late_resources = util::late_resources_ident(&name);
+
+                root_init.push(quote!(
+                    /// Resources initialized at runtime
+                    #cfg_core
+                    #[allow(non_snake_case)]
+                    pub struct #late_resources {
+                        #(#late_fields),*
+                    }
+                ));
+
+                Some(quote!(-> #name::LateResources))
+            } else {
+                None
+            }
+        };
+
+        let mut locals_pat = None;
+        let mut locals_new = None;
+        if !init.locals.is_empty() {
+            let (struct_, pat) = locals::codegen(Context::Init(core), &init.locals, app);
+
+            locals_new = Some(quote!(#name::Locals::new()));
+            locals_pat = Some(pat);
+            root_init.push(struct_);
+        }
+
+        let context = &init.context;
+        let attrs = &init.attrs;
+        let stmts = &init.stmts;
+        let user_init = Some(quote!(
+            #(#attrs)*
+            #cfg_core
+            #[allow(non_snake_case)]
+            fn #name(#(#locals_pat,)* #context: #name::Context) #ret {
+                #(#stmts)*
+            }
+        ));
+
+        let mut const_app = None;
+        if !init.args.resources.is_empty() {
+            let (item, constructor) =
+                resources_struct::codegen(Context::Init(core), 0, &mut needs_lt, app, analysis);
+
+            root_init.push(item);
+            const_app = Some(constructor);
+        }
+
+        let call_init =
+            Some(quote!(let late = #name(#(#locals_new,)* #name::Context::new(core.into()));));
+
+        root_init.push(module::codegen(Context::Init(core), needs_lt, app, extra));
+
+        (const_app, root_init, user_init, call_init)
+    } else {
+        (None, vec![], None, None)
+    }
+}