Move rtic macros to repo root, tune xtask

rtic-macros/src/analyze.rs

@@ -0,0 +1,49 @@
+use core::ops;
+use std::collections::{BTreeMap, BTreeSet};
+
+use crate::syntax::{
+    analyze::{self, Priority},
+    ast::{App, Dispatcher},
+};
+use syn::Ident;
+
+/// Extend the upstream `Analysis` struct with our field
+pub struct Analysis {
+    parent: analyze::Analysis,
+    pub interrupts: BTreeMap<Priority, (Ident, Dispatcher)>,
+}
+
+impl ops::Deref for Analysis {
+    type Target = analyze::Analysis;
+
+    fn deref(&self) -> &Self::Target {
+        &self.parent
+    }
+}
+
+// Assign an interrupt to each priority level
+pub fn app(analysis: analyze::Analysis, app: &App) -> Analysis {
+    let mut available_interrupt = app.args.dispatchers.clone();
+
+    // the set of priorities (each priority only once)
+    let priorities = app
+        .software_tasks
+        .values()
+        .map(|task| task.args.priority)
+        .collect::<BTreeSet<_>>();
+
+    // map from priorities to interrupts (holding name and attributes)
+
+    let interrupts: BTreeMap<Priority, _> = priorities
+        .iter()
+        .filter(|prio| **prio > 0) // 0 prio tasks are run in main
+        .copied()
+        .rev()
+        .map(|p| (p, available_interrupt.pop().expect("UNREACHABLE")))
+        .collect();
+
+    Analysis {
+        parent: analysis,
+        interrupts,
+    }
+}