feat: stack var (WIP)

evaluator/nixjit_eval/src/value/closure.rs

@@ -0,0 +1,25 @@
+//! Defines the runtime representation of a partially applied function.
+use std::rc::Rc;
+
+use derive_more::Constructor;
+
+use nixjit_error::Result;
+use nixjit_ir::ExprId;
+
+use super::Value;
+use crate::EvalContext;
+
+pub type StackFrame = smallvec::SmallVec<[Value; 5]>;
+
+#[derive(Debug, Clone, Constructor)]
+pub struct Closure {
+    pub body: ExprId,
+    pub frame: StackFrame,
+}
+
+impl Closure {
+    pub fn call<Ctx: EvalContext>(self: Rc<Self>, arg: Option<Value>, ctx: &mut Ctx) -> Result<Value> {
+        let Self { body: func, frame } = Rc::unwrap_or_clone(self);
+        ctx.call(func, arg, frame)
+    }
+}