From 6be1eae89399536838ff55e52d6e7d00f93a950d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Madeleine=20Sydney=20=C5=9Alaga?= <msyds@deertopia.net>
Date: Thu, 3 Sep 2026 15:34:45 -0600
Subject: [PATCH] arith

---
 src/Gyehoek/CPS/Eval.hs | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/Gyehoek/CPS/Eval.hs b/src/Gyehoek/CPS/Eval.hs
index 33ca68c..6c17b90 100644
--- a/src/Gyehoek/CPS/Eval.hs
+++ b/src/Gyehoek/CPS/Eval.hs
@@ -91,8 +91,9 @@ eval g (ExpLetRec bs e) = eval g' e
 
 eval g (Halt rs) = traverse (evalVal g) rs
 
-eval g (ExpContinue k xs) = evalVal g k >>= \case
-  ObjImm (ImmLabel "halt") -> traverse (evalVal g) xs
+eval g (ExpContinue k xs) =
+  case k of
+    ValVar x -> continueWith g (KexpVar x) xs
 
 eval g (ExpApply f xs ktail) = do
   f' <- evalVal g f
@@ -106,12 +107,31 @@ eval g (ExpApply f xs ktail) = do
           & #store <>~ H.fromList (zip bxs xs')
           & maybe id (\b -> #store . at b ?~ ktail') bktail
 
+eval g (ExpPrim p k) = traverse (evalVal g) p >>= \case
+  PrimAdd x y -> arith2 (+) x y
+  PrimMul x y -> arith2 (*) x y
+  PrimSub x y -> arith2 (-) x y
+  PrimDiv x y -> arith2 div x y
+  where
+    arith2 f (ObjImm (ImmInt x)) (ObjImm (ImmInt y)) =
+      pure1 . ObjImm . ImmInt $ f x y
+
 eval g e = err [i|unimplemented exp: #{S.encodeOrShow' @Text S.datumIso e}|]
 
+continueWith :: Jalmot :> es => Env -> Kexp -> List Val -> Eff es (List Obj)
+continueWith g kexp xs = do
+  xs' <- traverse (evalVal g) xs
+  evalKexp g kexp >>= \case
+    ObjImm (ImmLabel "halt") -> traverse (evalVal g) xs
+    ObjHob (HobClosure {code,env}) -> eval env' e
+      where
+        MkAbs bxs bktail e = code
+        env' = env & #store <>~ H.fromList (zip bxs xs')
+
 evalKexp :: Jalmot :> es => Env -> Kexp -> Eff es Obj
 evalKexp g = \case
   KexpVar x -> var g x
-  KexpKappa kap -> _
+  KexpKappa kap -> pure . ObjHob $ HobClosure (AbsKappa kap) g
 
 evalVal
   :: Jalmot :> es