stupid

.dir-locals.el

@@ -9,9 +9,6 @@
       . (progn (defun apply-cabal-fmt-h ()
                  (haskell-mode-buffer-apply-command "cabal-fmt"))
                (add-hook 'before-save-hook #'apply-cabal-fmt-h nil t)))))
- (scheme-mode
-  . ((eval . (dolist (s '(kappa κ prim))
-               (put s 'scheme-indent-function 1)))))
  (nil
   . ((eval
       . (progn (defun display-ansi ()

doc/closure-conversion.org

@@ -132,34 +132,3 @@ multiple ~env-ref~ calls could probably be replaced with a primitive that loads
                                  $code)
                      1))))
 #+end_src
-
-** example
-
-#+begin_src scheme
-  (λ (n m ktail)
-    (letrec ((f (λ (x ktail-0) (+ x n ktail-0)))
-             (g (λ (y ktail-1) (+ y g ktail-1))))
-      (prim (cons f g) ktail)))
-#+end_src
-
-#+begin_src scheme
-  (λ (n m ktail)
-    (letrec ((f-code (λ (x ktail-0)
-                       (prim (env-get 2)
-                         (κ (n)
-                           (+ x n ktail-0)))))
-             (g-code (λ (y ktail-1)
-                       (prim (env-get 3)
-                         (κ (m)
-                           (+ y m ktail-1))))))
-      (letrec ((with-closure-code
-                (κ (f g)
-                  (prim (get-env 0)
-                    (κ (ktail)
-                      (prim cons f g ktail))))))
-        (prim (make-shared-closure (with-closure-code)
-                                   ktail)
-          (κ (with-closure)
-            (prim (make-shared-closure (f-code g-code) n m)
-              with-closure))))))
-#+end_src

doc/libraries.org

@@ -1,9 +0,0 @@
-#+title: on libraries
-
-R⁷RS leaves it unspecified how exactly libraries correspond to files:
-
-#+begin_quote
-Programs and libraries are typically stored in files, although in some implementations they can be entered interactively into a running Scheme system. Other paradigms are possible. Implementations which store libraries in files should document the mapping from the name of a library to its location in the file system.
-#+end_quote
-
-thus the implementation of ~define-library~ is open to much interpretation. we could possibly define libraries as first-class objects, or deal with them statically. the former case is appealing to me, as it could massively simplify interactive use.

golden/exec/cons-2/exec

@@ -1,2 +0,0 @@
-ret > ExitSuccess
-out > (456 . 123)

golden/exec/cons-2/source.scm

@@ -1,2 +0,0 @@
-(let ((p (cons 123 456)))
-  (cons (cdr p) (car p)))

golden/exec/lit-int/exec

@@ -1,2 +0,0 @@
-ret > ExitSuccess
-out > 123

golden/exec/lit-int/source.scm

@@ -1 +0,0 @@
-123

golden/exec/map/exec

@@ -1,2 +0,0 @@
-ret > ExitSuccess
-out > (0 . (1 . (4 . (9 . (16 . ())))))

golden/exec/map/source.scm

@@ -1,7 +0,0 @@
-(letrec ((my-map (λ (f l)
-                   (if (pair? l)
-                       (cons (f (car l))
-                             (my-map f (cdr l)))
-                       (list)))))
-  (my-map (λ (x) (* x x))
-          (list 0 1 2 3 4)))

gyehoek.cabal

@@ -60,12 +60,12 @@ library
     Gyehoek.CPS.Close
     Gyehoek.CPS.Convert
     Gyehoek.CPS.Eval
-    Gyehoek.CPS.Hoist
+    Gyehoek.CPS.Stackify
     Gyehoek.CPS.Syntax
     Gyehoek.Driver
+    Gyehoek.Language
     Gyehoek.GenSym
     Gyehoek.Jalmot
-    Gyehoek.Language
     Gyehoek.Lift1
     Gyehoek.Options
     Gyehoek.Prelude
@@ -77,6 +77,9 @@ library
     Gyehoek.Sexp.QQ
     Gyehoek.Sexp.Read
     Gyehoek.Sexp.Syntax
+    Gyehoek.Stack.Lower
+    Gyehoek.Stack.Syntax
+    Gyehoek.Stack.VM
     Gyehoek.Wasm
 
   build-depends:
@@ -97,7 +100,6 @@ library
     , hashable
     , invertible-grammar
     , lens
-    , lucid
     , megaparsec
     , mtl
     , optparse-applicative
@@ -105,7 +107,6 @@ library
     , pretty-simple
     , prettyprinter
     , prettyprinter-ansi-terminal
-    , prettyprinter-lucid
     , process
     , recursion-schemes
     , scientific
@@ -116,7 +117,8 @@ library
     , typed-process
     , unordered-containers
     , vector
-    , tardis
+    , lucid
+    , prettyprinter-lucid
 
   hs-source-dirs:   src
   default-language: GHC2024
@@ -131,11 +133,14 @@ test-suite test
   -- cabal-fmt: expand test -Main
   other-modules:
     Gyehoek.Test.CPS.Eval
+    Gyehoek.Test.CPS.Stackify
     Gyehoek.Test.CPS.Syntax
+    Gyehoek.Test.Golden
     Gyehoek.Test.Scheme.Syntax
     Gyehoek.Test.Sexp.Print
     Gyehoek.Test.Sexp.QQ
     Gyehoek.Test.Sexp.Read
+    Gyehoek.Test.Stack.VM
     Gyehoek.TestUtil
     Root
 
@@ -166,7 +171,6 @@ test-suite doctest
   build-depends:
     , base
     , gyehoek
-
   default-extensions: CPP
   main-is:            doctest.hs
 

src/Gyehoek/CPS/Close.hs

@@ -7,49 +7,32 @@ import Gyehoek.CPS.Syntax
 import Data.List (nub)
 import Gyehoek.GenSym
 import Gyehoek.Prelude
-import Debug.Pretty.Simple
-import Gyehoek.Sexp qualified as S
-import Data.HashSet.Lens
-import Data.Traversable
 
 
-genCodeName :: GenSym :> es => Name -> Eff es Name
+close :: GenSym :> es => Exp -> Eff es Exp
-genCodeName f = gensym' @Name $ f ^. _Wrapped' . to (<> "-code")
+close = transformM \case
-
+  ExpLetRec [(f, AbsLambda lam@(MkLambda bs kb m))] e -> do
-bindEnv :: List Name -> Exp -> Exp
+    f_code <- gensym' @Name $ f ^. _Wrapped' . to (<> "-code")
-bindEnv frees m = [cps|
+    -- it would probably be most sane to generate a symbol for `env`,
-  (prim (get-env) (κ #{frees} #{m}))
+    -- but we're reusing the lambda binding so we don't have to
-|]
+    -- explicitly substitute recursive calls.
-
+    let frees = nub $ free' lam
-close1 :: forall es. GenSym :> es => Exp -> Eff es Exp
+    let m' = ifoldr
-close1 = \case
+             (\n x q ->
-  lr@(ExpLetRec bs e) -> do
+               let p = if x == f then PrimEnv @Val else PrimEnvRef n
-    let boundNames = bs ^.. each . _1
+               in [cps|
-    let boundNames' = setOf each boundNames
+                 (prim #{p}
-    let frees = bs
+                   (κ (#{x}) #{q}))
-          & foldMapOf
+             |])
-            (each . _2)
+             m frees
-            (freeWithBound' boundNames')
-          & nub
-    env_cont_l <- gensym' @Name "env-cont"
-    e_l <- gensym' @Name "letrec-body-cont"
-    bs' <- for bs \(f,ab) -> do
-      f_code_l <- genCodeName f
-      pure ( f_code_l
-           , ab & absBody %~ bindEnv (boundNames ++ frees)
-           )
-    let codes = bs' ^.. each . _1 . to MkLabel
     pure [cps|
-      (letrec #{bs'}
+      (letrec ((#{f_code} (λ (##{bs} #{kb})
-        (prim (make-shared-closure #{codes} #{frees})
+                            #{m'})))
-          (κ #{boundNames}
+        (prim (make-closure #{f_code} ##{frees})
-            #{e})))
+          (κ (#{f}) #{e})))
     |]
 
   e -> pure e
 
-close :: forall es. GenSym :> es => Exp -> Eff es Exp
-close = transformM close1
-
 closeProgram :: GenSym :> es => Program -> Eff es Program
 closeProgram = traverseOf (#body . #body) close

src/Gyehoek/CPS/Convert.hs

@@ -46,18 +46,29 @@ convert (Scm.ExpLit l) k = k . one . ValImm $ case l of
   LitBool b -> ImmBool b
   _ -> _
 
+-- special case: call/cc is desugared during cps-conversion...
+-- convert (Scm.ExpPrim (PrimCallCC withcc)) k = do
+--   convert1 withcc \withcc' -> do
+--     cc_l <- gensym' @Name "cc"
+--     r1_l <- gensym' @Name "r"
+--     r2_l <- gensym' @Name "r"
+--     ccish_l <- gensym' @Name "ccish"
+--     reified_cc_l <- gensym' @Name "reified-cc"
+--     m <- k [ValVar r1_l]
+--     pure [cps|
+-- (letrec ((#{cc_l} (κ (#{r1_l})
+--                      #{m})))
+--   (prim (capture/cc)
+--        (κ (#{reified_cc_l})
+--           (#{withcc'} #{reified_cc_l} #{cc_l}))))
+--     |]
+
+-- ...while all other prims are left as-is for later stages to
+-- handle..
 convert (Scm.ExpPrim p) k =
   telescope (convert1 @es) p \p' -> do
-    r_l <- gensym' "r"
+    r <- gensym' "r"
-    -- k_l <- gensym' @Name "prim-k"
+    ExpPrim p' . MkKappa [r] <$> k [ValVar r]
-    m <- k [ValVar r_l]
-    pure [cps|
-      (prim #{p'} (κ (#{r_l}) #{m}))
-    |]
-    -- pure [cps|
-    --   (letrec ((#{k_l} (κ (#{r_l}) #{m})))
-    --     (prim #{p'} #{k_l}))
-    -- |]
 
 convert (Scm.ExpLambda xs e) k = do
   f <- gensym' "lambda-body"
@@ -70,25 +81,17 @@ convert (Scm.ExpLambda xs e) k = do
 
 convert (Scm.ExpApply f xs) k =
   telescope (convert1 @es) (f:|xs) \(f':|xs') -> do
-    r <- gensym' @Name "r"
+    r <- gensym' "r"
     x <- gensym' "x"
     m <- k [ValVar x]
     pure $ ExpLetRec [(r, AbsKappa' [x] m)] $
-      ExpApply f' xs' (KexpVar r)
+      ExpApply f' xs' r
 
 convert (Scm.ExpBegin xs) k = telescope (convert @es) xs (k . NE.last)
 
 convert (Scm.ExpIf c t f) k =
-  convert1 c \c' -> do
+  convert1 c \c' ->
-    t_l <- gensym' @Name "truthy-cont"
+    ExpIf c' <$> convert t k <*> convert f k
-    f_l <- gensym' @Name "falsey-cont"
-    t' <- convert t k
-    f' <- convert f k
-    pure [cps|
-      (letrec ((#{t_l} (κ () #{t'}))
-               (#{f_l} (κ () #{f'})))
-        (if #{c'} #{t_l} #{f_l}))
-    |]
 
 -- let-bindings are desugared into continuation calls whose parameters
 -- are the left-hand sides and whose arguments are the right-hand

src/Gyehoek/CPS/Eval.hs

@@ -1,303 +1,99 @@
 {-# LANGUAGE ViewPatterns #-}
-{-# LANGUAGE DeriveAnyClass #-}
-{-# LANGUAGE TypeFamilies #-}
-{-# LANGUAGE OverloadedLists #-}
 module Gyehoek.CPS.Eval
   ( evalProgram
   , module Gyehoek.CPS.Syntax
   , evalExp
-  , eGrammar
   ) where
 
-import Gyehoek.CPS.Syntax hiding (Hob(..), Obj(..), cont)
+import Gyehoek.CPS.Syntax
-import Gyehoek.Sexp qualified as S
+import Control.Lens
-import Control.Lens hiding (assign)
+import Data.Maybe (fromMaybe)
-import Data.Maybe (fromMaybe, isJust)
 import Text.Show.Functions ()
 import qualified Data.HashMap.Strict as H
-import Gyehoek.Prelude hiding (assign)
+import Gyehoek.Prelude
 import Debug.Pretty.Simple
-import Gyehoek.Jalmot
-import Control.Monad.Cont
-import Gyehoek.Sexp qualified as S
-import GHC.Generics (Generically(..))
-import Gyehoek.Sexp ((:-)(..))
-import Data.List (nub, mapAccumR, compareLength)
-import Data.HashSet.Lens (setOf)
-import Data.IntMap.Strict (IntMap)
-import Data.IntMap.Strict qualified as IM
-import Data.Monoid
-import Control.Monad.State
-import Data.Traversable (for)
-import Data.Foldable (traverse_, foldrM)
 
 
-newtype Loc = MkLoc { getLoc :: Int }
+data Env = MkEnv
-  deriving stock (Generic, Data)
+  { vars :: HashMap Name Obj
-  deriving newtype (Show, Eq, Ord, Enum)
+  , labels :: HashMap Name (Env, Abs)
-
-data Store = MkStore
-  { nextLoc :: Loc
-  , heap :: IntMap E
   }
-  deriving stock (Show, Generic)
-
-type instance Index Store = Loc
-type instance IxValue Store = E
-
-instance Ixed Store where ix (MkLoc j) = #heap . ix j
-instance At Store where at (MkLoc j) = #heap . at j
-
-emptyStore :: Store
-emptyStore = MkStore
-  { nextLoc = MkLoc 0
-  , heap = mempty
-  }
-
-newtype Env = MkEnv { getEnv :: HashMap Name Loc }
-  deriving stock (Show, Generic, Data)
-  deriving newtype (Semigroup, Monoid)
-
-emptyEnv :: Env
-emptyEnv = mempty
-
-type instance Index Env = Name
-type instance IxValue Env = Loc
-
-instance Ixed Env where ix j = #getEnv . ix j
-instance At Env where at j = #getEnv . at j
-
-update :: Loc -> E -> Store -> Store
-update (MkLoc loc) v = #heap %~ IM.alter f loc
-  where
-    f (Just _) = Just v
-    f Nothing = error "segfault lol"
-
-updates :: Foldable f => f (Loc, E) -> Store -> Store
-updates = alaf Endo foldMap (uncurry update)
-
-fetch :: Loc -> M r E
-fetch (MkLoc loc) = gets (^?! #heap . ix loc)
-
-new :: M r Loc
-new = state \st -> (st.nextLoc, st & #nextLoc %~ succ)
-
-new' :: E -> M r Loc
-new' e = state \st ->
-  ( st.nextLoc
-  , st & #nextLoc %~ succ & at st.nextLoc ?~ e
-  )
-
-defines :: Traversable t => t (Name, E) -> M Answer Env
-defines = alaf Ap foldMap \(name,e) -> do
-  l <- new' e
-  pure $ bind name l
-
-var :: HasCallStack => Env -> Name -> M Answer Loc
-var g x = case g ^. at x of
-  Just l -> pure l
-  Nothing -> wrong [i|unbound variable #{x}|]
-
-type CmdCont = Store -> Answer
-type ExpCont = List E -> CmdCont
-
-type M r = ContT r (State Store)
-
-data Answer
-  = AnswerValues (List E)
-  | AnswerError AJalmot
   deriving (Show, Generic)
 
-data Mutability
+eval :: Env -> Exp -> List Obj
-  = Mut
-  | NoMut
-  deriving (Show, Generic, Data, Eq)
 
-wrong :: Text -> M Answer a
+eval g (Halt xs) = evalVal g <$> xs
-wrong s = ContT \_ -> pure . AnswerError . EvalError $ s
 
-orWrong
+eval g (ExpContinue k xs) =
-  :: Getting (First a) s a
+  case g ^. #labels . at k' of
-  -> Text -> s -> M Answer a
+    Just (h, AbsKappa' bs m) -> eval h' m
-orWrong p msg s = case getFirst . getConst $ p (Const . First . Just) s of
-  Nothing -> wrong msg
-  Just x -> pure x
-
-bind :: Name -> Loc -> Env
-bind k = MkEnv . H.singleton k
-
-extends :: Foldable f => f (Name, Loc) -> Env -> Env
-extends xs g = g <> foldMap (uncurry bind) xs
-
-assign :: Loc -> E -> M Answer ()
-assign l e = do
-  use (at l) >>= \case
-    Just _ -> at l ?= e
-    Nothing -> wrong [i|#{e}에서 #{l}이라는 주소는 없다|]
-
-
-
--- | The denotation of an expressed value.
-data E
-  = ESymbol Text
-  | ECharacter Char
-  | EInt Int
-  | EBool Bool
-  | EUndefined
-  | EUnspecified
-  | ENull
-  | EPair Mutability Loc Loc
-  | EVec Mutability (List Loc)
-  | EString Mutability (List Loc)
-  | EProcedure Procedure
-  deriving stock (Show, Generic)
-
-type Procedure = List E -> DynPoints -> M Answer (List E)
-
-eGrammar :: Store -> S.DatumGrammar E
-eGrammar st = S.partialOsi (const . Left $ mempty) go
       where
-    gofetch x = go $ st ^?! ix x
+        h' = h & #vars <>~ envOfBinds bs (evalVal g <$> xs)
-    go = \case
+    _ -> error [i|not a kappa: #{k}|]
-      ESymbol s -> S.Symbol s
-      ECharacter c -> S.Character c
-      EInt n -> S.Number (fromIntegral n)
-      EBool b -> S.Boolean b
-      EUndefined -> S.Unreadable "#<undefined>"
-      EUnspecified -> S.Unreadable "#<unspecified>"
-      EProcedure _ -> S.Unreadable "#<procedure>"
-      ENull -> S.List []
-      EPair _mut car cdr -> S.DotList [gofetch car] (gofetch cdr)
-      EVec _mut xs -> S.Vector . fmap gofetch $ xs
-      EString _mut xs -> S.String _
-
-data DynPoints = MkDynPoints
-  deriving (Generic, Data)
-
-
-
-truthy :: E -> Bool
-truthy (EBool False) = False
-truthy _ = True
-
-
-
-evalVal :: Env -> Val -> M Answer E
-
-evalVal g (ValVar x) = var g x >>= fetch
-
-evalVal g (ValImm imm) = case imm of
-  ImmLabel (MkLabel l) -> var g l >>= fetch
-  ImmInt n -> pure $ EInt n
-  ImmBool b -> pure $ EBool b
-  ImmUndefined -> pure EUndefined
-
-evalKexp :: Env -> Kexp -> M Answer E
-evalKexp g (KexpVar x) = var g x >>= fetch
-evalKexp g (KexpKappa kap) = evalAbs g (AbsKappa kap)
-
-evalAbs :: Env -> Abs -> M Answer E
-evalAbs g (MkAbs formals ktail e) = pure . EProcedure $ \xs dps ->
-  let
-    formals' = formals ++ foldMap (:[]) ktail
-    lformals = length formals'
-    lxs = length xs
-  in if lformals /= lxs
-  then wrong [i|함수는 #{lformals}개의 인자를 필요로 하는데 #{lxs}개 받았다.|]
-  else do
-    ls <- xs & traverse new'
-    let g' = g & extends (zip formals' ls)
-    eval g' dps e
-
-eval :: Env -> DynPoints -> Exp -> M Answer (List E)
-
-eval g dps (ExpJump f xs ktail) = do
-  f' <- evalVal g f
-  xs' <- traverse (evalVal g) xs
-  ktail' <- traverse (evalKexp g) (ktail ^.. _Just)
-  case f' of
-    EProcedure p -> p (xs' ++ ktail') dps
-    _ -> wrong "bad procedure"
-
-eval g dps (ExpLetRec bs e) = do
-  ls <- for bs . const $ new' EUndefined
-  let g' = g & extends (zip (bs ^.. each . _1) ls)
-  bs' <- forOf (each . _2) bs (evalAbs g')
-  traverse_ (uncurry assign) $ zip ls (bs' ^.. each . _2)
-  eval g' dps e
-
-eval g dps (ExpPrim (PrimCallCC withcc) k) = do
-  withcc' <- evalVal g withcc >>= orWrong #_EProcedure
-    [i|call/cc: 함수가 아닌 것을 받았다|]
-  k' <- evalKexp g k
-  kproc <- orWrong #_EProcedure [i|call/cc: 몰라...|] k'
-  let cc = EProcedure \xs dps -> case unsnoc xs of
-        Just (xs',_) -> kproc xs' dps
-        Nothing -> wrong [i|call/cc: 잘못하는데!|]
-  withcc' [cc,k'] dps
-
-eval g dps (ExpPrim p k) = do
-  p' <- evalPrim g dps =<< traverse (evalVal g) p
-  evalKexp g k >>= \case
-    EProcedure fp -> fp p' dps
-    _ -> wrong [i|prim(#{p})의 계속을 나쁘다|]
-
-eval g dps (ExpIf c t f) = do
-  c' <- evalVal g c
-  let b = if truthy c' then t else f
-  var g b >>= fetch >>= \case
-    EProcedure fp -> fp [] dps
-    _ -> wrong [i|if의 계속을 나쁘다|]
-
-eval g dps e = error [i|unimplemented #{e}|]
-
-evalPrim :: Env -> DynPoints -> Prim E -> M Answer (List E)
-evalPrim g dps = \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
-  PrimZeroP x -> pure1 . EBool . isJust $ x ^? #EInt . only 0
-  PrimCons x y -> pcons x y >>= pure1
-  PrimCar p -> cr p _2
-  PrimCdr p -> cr p _3
-  PrimPairP p -> pure1 . EBool . maybe False (const True) $
-    p ^? #_EPair
-  PrimValues xs -> pure xs
-  PrimList xs -> foldrM pcons ENull xs >>= pure1
-  p -> wrong [i|prim(#{p})은 벌써 나지 않다|]
   where
-    pure1 x = pure [x]
+    k' = case evalVal g k of
-    pcons x y = do
+      ObjImm (ImmLabel x) -> x
-      (x',y') <- traverseOf both new' (x,y)
+      x -> error [i|expected label, got #{x}|]
-      pure $ EPair Mut x' y'
-    arith2 f (EInt x) (EInt y) = pure [EInt $ f x y]
-    arith2 f x y = wrong [i|나쁜 인자: #{x}, #{y}|]
-    cr p l = orWrong (#_EPair . l) [i|car/cdr는 pair을 받지 않다|] p
-      >>= fmap (:[]) . fetch
 
-
+eval g (ExpApply f xs ktail) =
-
+  case g ^?! #labels . at f' of
-evalExp :: Jalmot :> es => Exp -> Eff es _
+    Just (h,AbsLambda' bs kb m) -> eval h' m
-evalExp e = _
+      where h' = h & #vars <>~ envOfBinds bs (evalVal g <$> xs)
-
+                   & #labels . at kb .~ (g ^. #labels . at ktail)
-evalProgram :: Jalmot :> es => Program -> Eff es (List S.Datum)
+    Nothing -> error [i|undefined label: #{f}|]
-evalProgram (MkProgram lam) = case run (pure . AnswerValues) of
-  (AnswerError jm, _) -> throwError jm
-  (AnswerValues vs, st) -> traverse (S.toDatum $ eGrammar st) vs
   where
-    run f = (`runState` emptyStore) . (`runContT` f) $ do
+    f' = case evalVal g f of
-      g <- setup
+      ObjImm (ImmLabel x) -> x
-      eval g MkDynPoints (ExpLetRec
+      x -> error [i|expected label, got #{x}|]
-        [("_start",AbsLambda lam)]
-        (ExpApply (ValVar "_start") [] (KexpVar "halt")))
 
-
+eval g (ExpLetRec [(b, ab)] e) = eval g' e
+  where g' = g & #labels . at b ?~ ab
 
-setup :: M Answer Env
+eval g (ExpPrim p (MkKappa bs e)) = case evalVal g <$> p of
-setup = defines @List
+  PrimAdd x y -> arithBinop (+) x y
-  [ ("halt", EProcedure prim_halt)
+  PrimMul x y -> arithBinop (*) x y
-  ]
+  PrimSub x y -> arithBinop (-) x y
+  PrimDiv x y -> arithBinop div x y
+  PrimMakeClosure x env -> ret [ObjHob (HobClosure lbl env) ]
+    where
+      lbl = case x of
+        ObjImm (ImmLabel l) -> l
+        _ -> error [i|expected label, got #{x}|]
+  _ -> error [i|unhandled prim: #{p}|]
+  where
+    ret rs = eval
+        (g & #vars <>~ envOfBinds bs rs)
+        e
+    arithBinop f (ObjImm (ImmInt x)) (ObjImm (ImmInt y)) =
+      ret [ObjImm . ImmInt $ f x y]
+    arithBinop _ x y = error [i|bad arith: #{x}, #{y}|]
 
-prim_halt :: Procedure
+eval _ e = error [i|unimplemented case: #{e}|]
-prim_halt xs _dps = ContT \_ -> pure $ AnswerValues xs
+
+envOfBinds bs xs = foldMap (uncurry H.singleton) (zip bs xs)
+
+evalVal :: Env -> Val -> Obj
+evalVal g = \case
+  ValVar x -> fromMaybe (error [i|unbound: #{x}|]) $ g ^?! #vars . at x
+  ValImm x -> ObjImm x
+
+emptyEnv :: Env
+emptyEnv = MkEnv
+  { vars = mempty
+  -- a kinda silly hack to make sure `halt` is handled correctly when
+  -- it appears as the tail continuation of an application. the
+  -- special case of `eval` responsible for `halt` only covers terms
+  -- of the form `(continue $halt xs …)`; other terms such as
+  -- `($some-fn xs $halt)` just see an undefined label `$halt`.
+  , labels = H.singleton "halt" $
+     AbsKappa' ["h0"] $ Halt [ValVar "h0"]
+  }
+
+evalExp :: Exp -> List Obj
+evalExp = eval emptyEnv
+
+evalProgram :: Program -> List Obj
+evalProgram (MkProgram lam) = eval emptyEnv [cps|
+  (letrec ((start #{lam}))
+    (start halt))
+|]

src/Gyehoek/CPS/Hoist.hs

@@ -1,24 +0,0 @@
-module Gyehoek.CPS.Hoist
-  ( hoistProgram
-  ) where
-
-import Gyehoek.CPS.Syntax
-import Gyehoek.Prelude
-import qualified Data.HashMap.Strict as H
-import Effectful.Writer.Static.Local
-import Data.Foldable
-
-
-type Hoist = Writer (HashMap Label Abs)
-
-hoist :: Hoist :> es => Exp -> Eff es Exp
-hoist = transformM \case
-  ExpLetRec bs m -> do
-    traverse_ (\(k,v) -> tell $ H.singleton (MkLabel k) v) bs
-    pure m
-  e -> pure e
-
-hoistProgram :: Program -> Eff es HoistedProgram
-hoistProgram p = do
-  (body,bindings) <- runWriter $ traverseOf #body hoist p.body
-  pure $ MkHoistedProgram {body,bindings}

src/Gyehoek/CPS/Stackify.hs

@@ -0,0 +1,200 @@
+{-# LANGUAGE OverloadedLists #-}
+module Gyehoek.CPS.Stackify
+  ( stackifyProgram
+  , module Gyehoek.CPS.Syntax
+  ) where
+
+import Gyehoek.CPS.Syntax
+import Gyehoek.Stack.Syntax qualified as Stk
+import Data.Sequence (Seq)
+import Data.Sequence qualified as Seq
+import Gyehoek.GenSym
+import Effectful.Writer.Static.Shared
+import Data.Foldable
+import qualified Data.HashMap.Strict as H
+import Data.List (elemIndex, nub)
+import Data.Text qualified as T
+import Gyehoek.Prelude
+import Debug.Pretty.Simple
+import qualified Gyehoek.Sexp as S
+
+
+type Stackify = Writer Stk.Program
+
+runStackify :: Eff (Stackify : es) a -> Eff es (a, Stk.Program)
+runStackify = runWriter
+
+live :: Free a => Env -> a -> List Name
+-- TODO: free' should return an OSet lol
+live g e = nub (free' e) & filter \x ->
+  x `elem` g.bound
+  -- && not (x `elem` g.contStack)
+
+data BlockBuilder
+  = Code (List Stk.Instr) BlockBuilder
+  | Tail Stk.Tail
+  deriving (Show, Generic)
+
+buildBlock :: BlockBuilder -> Stk.Block
+buildBlock = go [] where
+  go acc (Code xs bb) = go (acc ++ xs) bb
+  go acc (Tail t) = Stk.MkBlock acc t
+
+emitRoutine :: Stackify :> es => Stk.Routine -> Eff es ()
+emitRoutine rt = tell [rt]
+
+stackify
+  :: (GenSym :> es, Stackify :> es)
+  => Env -> Exp -> Eff es BlockBuilder
+
+stackify g (ExpLetRec [(f, AbsKappa kap)] e) = do
+  kap' <- stackifyKappa g kap
+  emitRoutine . Stk.MkRoutine (MkLabel f) . buildBlock $ kap'
+  stackify g e
+
+stackify g (ExpLetRec [(f, AbsLambda lam)] e) = do
+  lam' <- stackifyLambda g (MkLabel f) lam
+  emitRoutine lam'
+  stackify g e
+
+stackify g (ExpIf c t f) = do
+  let c' = stackifyVal g c
+  t' <- buildBlock <$> stackify g t
+  f' <- buildBlock <$> stackify g f
+  pure . Tail $ Stk.If c' t' f'
+
+stackify g (ExpApply f xs ktail) = do
+  pure $
+    Code [ Stk.Push $ stackifyVal g (ValVar ktail)
+         , Stk.Push $ stackifyVal g f
+         ] $
+    Code (pushArgs g xs) $
+    Tail (Stk.Call (length xs))
+
+stackify g e@(ExpContinue k xs)
+  | isn't (#_ValVar . only g.tail) k = pure $
+    Code [ Stk.Push (stackifyVal g k) ] $
+    Code (pushArgs g xs) $
+    Tail $ Stk.TailCall (length xs)
+  | otherwise = pure $
+    Code (pushArgs g xs) $
+    Tail (Stk.Return (length xs))
+
+stackify g (ExpPrim (PrimCallCC withcc) cc) = do
+  cc' <- stackifyKappa g cc
+  cc_l <- gensym' @Label "cc"
+  emitRoutine . Stk.MkRoutine cc_l . buildBlock $ cc'
+  pure $
+    Code [ Stk.Push $ stackifyVal g withcc
+         , Stk.Push $ stackifyVal g (ValLabel cc_l)
+         ] $
+    Tail Stk.CallCC
+
+stackify g (ExpPrim p kap) = do
+  kap' <- stackifyKappa g kap
+  pure $ Code [ Stk.Prim (stackifyVal g <$> p) ] kap'
+
+stackify _ e = error [i|unimplemented exp: #{e}|]
+
+loadArgs :: List Name -> List Stk.Instr
+loadArgs = imapOf itraversed \n x -> Stk.Load (MkReg x) n
+
+pushArgs :: Env -> List Val -> List Stk.Instr
+pushArgs g args = [ Stk.Push $ stackifyVal g x | x <- reverse args ]
+
+-- affine
+_ValName :: Traversal' Val Name
+_ValName = failing #_ValVar (#_ValImm . #_ImmLabel . #_MkLabel)
+
+stackifyKappa
+  :: (Stackify :> es, GenSym :> es)
+  => Env -> Kappa
+  -> Eff es BlockBuilder
+stackifyKappa g (MkKappa xs m) = do
+  let g' = g & #bound <>:~ xs
+  Code (loadArgs g'.bound)
+    <$> stackify g' m
+
+stackifyLambda
+  :: (Stackify :> es, GenSym :> es)
+  => Env -> Label -> Lambda
+  -> Eff es Stk.Routine
+stackifyLambda g name (MkLambda xs k m) = do
+  m' <- stackify (g & #bound .~ xs & #tail .~ k) m
+  pure $
+    Stk.MkRoutine name . buildBlock $
+    Code (loadArgs xs) $
+    Code [Stk.Load (MkReg k) (length xs + 1)] m'
+
+stackifyVal :: Env -> Val -> Stk.Val
+stackifyVal g = \case
+  ValImm imm -> Stk.ValImm imm
+  ValVar v -> case regOf g v of
+    Just r -> Stk.ValReg r
+    Nothing -> Stk.ValLabel (MkLabel v)
+  v -> error [i|unimplemented val: #{v}|]
+
+regOf :: Env -> Name -> Maybe Reg
+regOf g x
+  | x `elem` g.bound || x == g.tail = Just . MkReg $ x
+  | otherwise                       = Nothing
+
+
+
+data Env = MkEnv
+  -- | `bound` tracks the stack lifetime of bound variables.
+  { bound :: List Name
+  -- | for each locally-bound continuation @k@, @liveness@ has an
+  -- entry @(k,ls)@ where @ls@ is the sequence of registers @k@
+  -- expects to find saved on the stack.
+  , liveness :: HashMap Label (List Name)
+  , tail :: Name
+  }
+  deriving (Show, Generic)
+
+emptyEnv :: Env
+emptyEnv = MkEnv
+  { bound = mempty
+  , liveness = mempty
+  , tail = "halt"
+  }
+
+
+
+stackifyProgram :: GenSym :> es => Program -> Eff es Stk.Program
+stackifyProgram (MkProgram lam) = do
+  let g = emptyEnv
+  (_,p) <- runStackify $ emitRoutine =<< stackifyLambda g "start" lam
+  pure p
+
+letfn :: Program
+letfn = [cps|
+(λ (start-ktail0)
+  (letrec ((lambda-body1
+            (λ (x lambda-tail2)
+              (prim (* x x) (κ (r3) (continue lambda-tail2 r3))))))
+    (letrec ((let-body6
+              (κ (square)
+                (letrec ((r4 (κ (x5) (continue start-ktail0 x5))))
+                  (square 4 r4)))))
+      (continue let-body6 lambda-body1))))
+|]
+
+blah :: Program
+blah = [cps|
+(λ (ktail0)
+          (letrec ((fac (λ (n ktail)
+                             (prim (zero? n)
+                               (κ (x0)
+                                 (if x0
+                                   (continue ktail 1)
+                                   (prim (- n 1)
+                                     (κ (x1)
+                                       (letrec ((fac-k0
+                                                  (κ (x2)
+                                                    (prim (* n x2)
+                                                      (κ (x3)
+                                                        (continue ktail x3))))))
+                                         (fac x1 fac-k0))))))))))
+               (fac 6 halt)))
+|]

src/Gyehoek/CPS/Syntax.hs

@@ -10,12 +10,10 @@ module Gyehoek.CPS.Syntax
   , Kappa(..)
   , Lambda(..)
   , Exp(..)
-  , Kexp(..)
   , ExpF(..)
   , Name(..)
   , Prim(..)
   , Program(..)
-  , HoistedProgram(..)
   , Lit(..)
   , Imm(..)
   , Obj(..)
@@ -41,12 +39,6 @@ module Gyehoek.CPS.Syntax
   , Free(..)
   , pattern ValLabel
   , pattern ObjLabel
-  , absBody
-  , pattern MkAbs
-  , _MkAbs
-  , unhoist
-  , pattern ExpJump
-  , _ExpJump
   )
   where
 
@@ -64,10 +56,6 @@ import Gyehoek.Sexp (G, (:-)(..))
 import qualified Data.InvertibleGrammar.Base as IG
 import Gyehoek.GenSym (Gen)
 import Data.String (IsString)
-import Control.Applicative
-import qualified Data.HashMap.Strict as H
-import GHC.Records (HasField (..))
-import Data.Bifunctor
 
 -- Data types
 
@@ -125,60 +113,24 @@ data Abs
   | AbsLambda Lambda
   deriving (Show, Generic, Data, Eq)
 
-pattern AbsKappa' :: List Name -> Exp -> Abs
+pattern AbsKappa' :: [Name] -> Exp -> Abs
 pattern AbsKappa' xs e = AbsKappa (MkKappa xs e)
 
-pattern AbsLambda' :: List Name -> Name -> Exp -> Abs
+pattern AbsLambda' :: [Name] -> Name -> Exp -> Abs
 pattern AbsLambda' xs e ktail = AbsLambda (MkLambda xs e ktail)
 
-{-# COMPLETE AbsKappa', AbsLambda' #-}
-
-_MkAbs :: Iso' Abs (List Name, Maybe Name, Exp)
-_MkAbs = iso
-  (\case
-    AbsKappa' xs e -> (xs,Nothing,e)
-    AbsLambda' xs ktail e -> (xs,Just ktail,e))
-  (\(xs,ktail,e) -> case ktail of
-    Just k -> AbsLambda' xs k e
-    Nothing -> AbsKappa' xs e)
-
-pattern MkAbs :: List Name -> Maybe Name -> Exp -> Abs
-pattern MkAbs xs ktail body <- (view _MkAbs -> (xs,ktail,body))
-  where MkAbs xs ktail body = review _MkAbs (xs,ktail,body)
-
-{-# COMPLETE MkAbs #-}
-
-_ExpJump :: Prism' Exp (Val, List Val, Maybe Kexp)
-_ExpJump = prism'
-  (\(f,xs,ktail) -> case ktail of
-    Just k -> ExpApply f xs k
-    Nothing -> ExpContinue f xs)
-  \case
-    ExpApply f xs ktail -> Just (f,xs,Just ktail)
-    ExpContinue f xs -> Just (f,xs,Nothing)
-    _ -> Nothing
-
-pattern ExpJump :: Val -> List Val -> Maybe Kexp -> Exp
-pattern ExpJump f xs ktail <- (preview _ExpJump -> Just (f,xs,ktail))
-  where ExpJump f xs ktail = review _ExpJump (f,xs,ktail)
-
 data Exp
-  = ExpPrim (Prim Val) Kexp
+  = ExpPrim (Prim Val) Kappa
   | ExpLetRec { binders :: List (Name, Abs), body :: Exp }
   | ExpContinue Val (List Val)
-  | ExpIf Val Name Name
+  | ExpIf Val Exp Exp
   | ExpApply
     { op :: Val
     , args :: List Val
-    , cont :: Kexp
+    , cont :: Name
     }
   deriving (Show, Generic, Data, Eq)
 
-data Kexp
-  = KexpVar Name
-  | KexpKappa Kappa
-  deriving (Show, Generic, Data, Eq)
-
 pattern Halt :: List Val -> Exp
 pattern Halt xs = ExpContinue (ValLabel "halt") xs
 
@@ -193,22 +145,6 @@ data Program = MkProgram
   }
   deriving (Show, Generic, Data)
 
-data HoistedProgram = MkHoistedProgram
-  { bindings :: HashMap Label Abs
-  , body :: Lambda
-  }
-  deriving stock (Show, Generic, Data)
-
-type instance Index HoistedProgram = Label
-type instance IxValue HoistedProgram = Abs
-
-instance Ixed HoistedProgram where ix j = #bindings . ix j
-
-instance At HoistedProgram where at j = #bindings . at j
-
-instance Each HoistedProgram HoistedProgram Abs Abs where
-  each = #bindings . each
-
 makePrisms ''Kappa
 makePrisms ''Exp
 makeFieldsId ''Exp
@@ -232,21 +168,6 @@ _AbsLambda' = prism'
 
 instance Plated Exp where plate = uniplate
 
-absBody :: Lens' Abs Exp
-absBody = lens
-  (\case
-    AbsLambda lam -> lam.body
-    AbsKappa kap -> kap.body)
-  (\cases
-    (AbsLambda lam) b -> AbsLambda $ lam & #body .~ b
-    (AbsKappa kap) b -> AbsKappa $ kap & #body .~ b)
-
-unhoist :: HoistedProgram -> Program
-unhoist p =
-  MkProgram $ p.body & body %~ ExpLetRec
-    (p ^.. #bindings . itraversed . withIndex
-      . to (\(MkLabel l, ab) -> (l,ab)))
-
 
 -- DatumIso instances
 
@@ -350,51 +271,30 @@ instance S.DatumIso Exp where
       if_ = S.ifLike "if"
         S.datumIso S.datumIso S.datumIso
       app :: forall t.
-        G (Datum :- t) (Kexp :- List Val :- Val :- t)
+        G (Datum :- t) (Name :- ([Val] :- (Val :- t)))
-      app = S.list $
+      app = S.list $ S.el (S.datumIso @Val)
-        S.flipped (S.PartialIso
+        -- >>> S.flipped Gyehoek.Datum.nonEmptyGrammar
-          (\(S.MkListContext ctx :- t) ->
-            case ctx of
-              f:kexp:xs -> S.MkListContext (f : snoc xs kexp) :- t
-              _ -> error "unreachable")
-          (\(S.MkListContext ctx :- t) ->
-            case unsnoc ctx of
-              Just (f:xs,kexp) -> Right $ S.MkListContext (f:kexp:xs) :- t
-              _ -> Left $ S.expected "continuation arg"))
-        >>> S.el (S.datumIso @Val)
-        >>> S.el (S.datumIso @Kexp)
         >>> S.rest (S.datumIso @Val)
-        >>> S.onTail S.swap
+        -- >>> _
+        >>> S.onTail (S.flipped $ IG.PartialIso
+                      (\(karg :- args :- op :- t) ->
+                         (args ++ [ValVar karg]) :- op :- t)
+                      (\(xs :- op :- t) -> case xs ^? _Snoc of
+                          Just (args,preview #ValVar -> Just karg) ->
+                            Right $ karg:- args :- op :- t
+                          _ -> Left $ S.expected "continuation arg"
+                      ))
+      -- prim = S.headTagged2 "prim"
+      --   (primDatumIso id (S.datumIso @Val))
+      --   (S.datumIso @Kappa)
       prim = S.list $
         S.el (S.decorate S.SynBuiltin >>> S.sym "prim")
         >>> S.el (primDatumIso id (S.datumIso @Val))
         >>> S.el S.datumIso
 
-instance S.DatumIso Kexp where
-  datumIso = S.match
-    $ S.With (S.datumIso @Name >>>)
-    $ S.With (S.datumIso @Kappa >>>)
-    $ S.End
-
 instance S.DatumIso Program where
   datumIso = S.with \prog -> S.datumIso @Lambda >>> prog
 
--- the printed representation is pretty dishonest in its current
--- state. consider the following hoisted program:
--- 
---  (letrec ((k (κ () (continue start-ktail 123))))
---    (λ (start-ktail)
---      (continue k)))
--- 
--- here, `start-ktail` is bound in `k`, but the printed representation
--- fails to reflect that.
-instance S.DatumIso HoistedProgram where
-  datumIso = S.with \prog ->
-    S.letLike "letrec"
-      (S.datumIso @Label) (S.datumIso @Abs) (S.datumIso @Lambda)
-    >>> S.onTail (S.iso H.fromList H.toList)
-    >>> prog
-
 
 -- quasiquoters
 
@@ -407,7 +307,6 @@ instance CPS Kappa where toCPS = S.fromDatumUnsafe S.datumIso
 instance CPS Lambda where toCPS = S.fromDatumUnsafe S.datumIso
 instance CPS Abs where toCPS = S.fromDatumUnsafe S.datumIso
 instance CPS Program where toCPS = S.fromDatumUnsafe S.datumIso
-instance CPS HoistedProgram where toCPS = S.fromDatumUnsafe S.datumIso
 
 cps :: S.QuasiQuoter
 cps = S.makeSx' [| toCPS |]
@@ -430,8 +329,7 @@ class Free a where
   freeWithBound :: HashSet Name -> a -> HashSet Name
   freeWithBound bound = HS.fromList . freeWithBound' bound
 
-  -- | Free variables given in the same left-to-right order they
+  -- | Free variables given in the order of their appearance.
-  -- appear.
   free' :: a -> List Name
   free' = freeWithBound' mempty
 
@@ -441,21 +339,11 @@ instance Free Abs where
   freeWithBound' bound (AbsKappa kap) = freeWithBound' bound kap
   freeWithBound' bound (AbsLambda lam) = freeWithBound' bound lam
 
-mif :: Alternative f => (a -> Bool) -> a -> f a
-mif p a
-  | p a = pure a
-  | otherwise = empty
-
-instance Free Kexp where
-  freeWithBound' bound = \case
-    KexpVar x -> mif (`notElem` bound) x
-    KexpKappa kap -> freeWithBound' bound kap
-
 instance Free Exp where
   freeWithBound' bound = \case
     ExpPrim p k ->
-      (p ^.. folded . #ValVar . filtered (`notElem` bound))
+      p & toListOf (folded . #ValVar . filtered (`notElem` bound))
-      ++ freeWithBound' bound k
+        & (<> freeWithBound' bound k)
     ExpLetRec bs m ->
       foldMapOf (each . _2) (freeWithBound' bound') bs
       <> freeWithBound' bound' m
@@ -463,10 +351,10 @@ instance Free Exp where
     ExpContinue k xs -> filter (`notElem` bound) ((k:xs) ^.. each . #ValVar)
     ExpIf c t f ->
       (c ^.. #ValVar . filtered (`notElem` bound))
-      <> mif (`notElem` bound) t <> mif (`notElem` bound) f
+      <> freeWithBound' bound t <> freeWithBound' bound f
     ExpApply f xs k ->
       (f:xs) ^.. (each . #ValVar . filtered (`notElem` bound))
-      <> freeWithBound' bound k
+      <> (k ^.. filtered (`notElem` bound))
 
 instance Free Kappa where
   freeWithBound' bound (MkKappa xs m) =

src/Gyehoek/Driver.hs

@@ -1,5 +1,5 @@
 module Gyehoek.Driver
-  (main, convert_e2e, parse_e2e, readScm, eval_cps1_e2e, eval_cps2_e2e)
+  (main, lower_e2e, convert_e2e, parse_e2e, readScm, eval_e2e)
   where
 
 import Gyehoek.Options
@@ -17,6 +17,7 @@ import qualified Data.Text.Encoding as T
 import System.IO (Handle)
 import System.IO qualified as IO
 import Gyehoek.CPS.Convert
+import Gyehoek.Stack.Lower
 import Gyehoek.CPS.Eval qualified as CPS
 import Control.Monad
 import Text.Pretty.Simple (pShowNoColor)
@@ -24,14 +25,16 @@ import System.Process.Typed
 import System.Environment.Blank (getEnvDefault)
 import qualified Data.Text.IO as TIO
 import qualified Data.ByteString.Lazy as BS
+import Gyehoek.CPS.Stackify (stackifyProgram)
+import Gyehoek.Stack.VM (eval, writeObj, Obj, traceEval)
 import qualified Data.Text as T
+import Gyehoek.Stack.Syntax qualified as Stk
 import Gyehoek.CPS.Close (closeProgram)
 import Control.Lens.Extras (is)
 import Control.Arrow ((>>>))
 import Gyehoek.Prelude
 import Gyehoek.Jalmot
 import qualified Gyehoek.Sexp as S
-import Gyehoek.CPS.Hoist (hoistProgram)
 
 
 main :: IO ()
@@ -115,20 +118,29 @@ driver opts = do
     hPutStrLn FS.stdout . view strict . pShowNoColor $ scm
   cps <- convertProgram scm
   when opts.dumpCPS do
-     S.writeDatum cps
+     hPutStrLn FS.stdout =<< S.encodeWith S.datumIso cps
   closedCps <- closeProgram cps
   when opts.dumpClosed do
-    S.writeDatum closedCps
+    hPutStrLn FS.stdout =<< S.encodeWith S.datumIso closedCps
-  hoistedCps <- hoistProgram closedCps
-  when opts.dumpHoisted do
-    S.writeDatum hoistedCps
   let rt_is p = is (_Just . p) opts.runtime
-  when (rt_is #HigherOrderCPS) do
+  dumpOrRun opts.dumpStackified (rt_is #Stackify)
-    CPS.evalProgram cps
+    (stackifyProgram closedCps)
-      >>= S.writeData
+    (hPutStrLn FS.stdout <=< S.encodeDataWith S.dataIso)
+    (eval >=> fmap writeObj
+         >>> T.unwords
+         >>> hPutStrLn FS.stdout)
   when (rt_is #CPS) do
-    CPS.evalProgram closedCps
+    closedCps
-      >>= S.writeData
+      & CPS.evalProgram
+      & fmap writeObj
+      & T.unwords
+      & hPutStrLn FS.stdout
+  -- dumpOrRun opts.inspectWasm (rt_is #Wasm)
+  --   (lowerProgram cps)
+  --   inspectWasm
+  --   (\wat -> withFile opts.output FS.WriteMode \h -> hPutStrLn h wat)
+  when opts.traceStackified do
+    stackifyProgram closedCps >>= traceEval
 
 parse_e2e :: FilePath -> IO Scm.Program
 parse_e2e = runJalmotIO . runFileSystem . readScm
@@ -137,18 +149,12 @@ convert_e2e :: FilePath -> IO CPS.Program
 convert_e2e = runJalmotIO . runFileSystem . runGenSym
   . (closeProgram <=< convertProgram <=< readScm)
 
-eval_cps1_e2e :: FilePath -> IO Text
+lower_e2e :: FilePath -> IO Text
-eval_cps1_e2e fp = runJalmotIO . runFileSystem . runGenSym $
+lower_e2e =
-  readScm fp
+  runJalmotIO . runFileSystem . runGenSym
-   >>= convertProgram
+  . (lowerProgram <=< closeProgram <=< convertProgram <=< readScm)
-   >>= closeProgram
-   >>= CPS.evalProgram
-   >>= pure . S.encodeOrShowData' S.dataIso
 
-eval_cps2_e2e :: FilePath -> IO Text
+eval_e2e :: FilePath -> IO (List Obj)
-eval_cps2_e2e fp = runJalmotIO . runFileSystem . runGenSym $
+eval_e2e fp = runJalmotIO . runFileSystem . runGenSym $ do
-  readScm fp
+  stk <- stackifyProgram <=< closeProgram <=< convertProgram <=< readScm $ fp
-   >>= convertProgram
+  eval stk
-   -- >>= closeProgram
-   >>= CPS.evalProgram
-   >>= pure . S.encodeOrShowData' S.dataIso

src/Gyehoek/Jalmot.hs

@@ -31,7 +31,6 @@ data AJalmot
   = ReaderError (ParseErrorBundle Text Void)
   | GrammarError (Grammar.ErrorMessage Ann)
   | VMError Text
-  | EvalError Text
   deriving (Show, Generic, Data)
 
 data AJalmotCS = MkAJalmotCS !CallStack !AJalmot
@@ -67,7 +66,6 @@ instance Exception AJalmot where
         & layoutPretty defaultLayoutOptions
         & renderString
     VMError err -> [i|#{err}|]
-    EvalError err -> [i|#{err}|]
 
 instance Exception AJalmotCS where
   backtraceDesired = const False

src/Gyehoek/Options.hs

@@ -13,13 +13,14 @@ import Data.Foldable
 import Gyehoek.Prelude hiding (argument)
 
 
-data Runtime = Wasm | CPS | HigherOrderCPS
+data Runtime = Stackify | Wasm | CPS
   deriving (Show, Generic, Eq)
 
 data Language
   = LanguageScheme
   | LanguageCPS
   | LanguageClosed
+  | LanguageStackified
   | LanguageWasm
   deriving (Show, Generic, Eq)
 
@@ -27,30 +28,30 @@ data Options = MkOptions
   { dumpClosed :: Bool
   , dumpCPS :: Bool
   , dumpParsed :: Bool
-  , dumpHoisted :: Bool
+  , dumpStackified :: Bool
-  , noColour :: Bool
+  , traceStackified :: Bool
   , runtime :: Maybe Runtime
   , inspectWasm :: Bool
   , output :: FilePath
   , sourceFile :: FilePath
   , sourceLanguage :: Language
-  , targetLanguage :: Language
   }
   deriving (Show, Generic)
 
-languageValues = ["scheme","cps","closed","wasm"]
+languageValues = ["scheme","cps","closed","stackified","wasm"]
 languageReader = maybeReader \case
   "scheme" -> Just LanguageScheme
   "cps" -> Just LanguageCPS
   "closed" -> Just LanguageClosed
+  "stackified" -> Just LanguageStackified
   "wasm" -> Just LanguageWasm
   _ -> Nothing
 
 runtimeValues = ["stackify","wasm","cps","none"]
 runtimeReader = maybeReader \case
+  "stackify" -> Just (Just Stackify)
   "wasm" -> Just (Just Wasm)
-  "cps1" -> Just (Just CPS)
+  "cps" -> Just (Just CPS)
-  ("cps";"higher-order-cps") -> Just (Just HigherOrderCPS)
   "none" -> Just Nothing
   _ -> Nothing
 
@@ -58,19 +59,16 @@ parser :: Parser Options
 parser = do
   dumpClosed <- switch (long "dump-closed")
   dumpCPS <- switch (long "dump-cps")
+  dumpStackified <- switch (long "dump-stackified")
   dumpParsed <- switch (long "dump-parsed")
-  dumpHoisted <- switch (long "dump-hoisted")
+  traceStackified <- switch (long "trace-stackified")
-  noColour <- switch . fold $
-    [ long "no-colour"
-    , long "no-color"
-    ]
   inspectWasm <- switch $ long "inspect-wasm" <> short 'p'
   runtime <- option runtimeReader . fold $
     [ long "runtime"
     , short 'R'
-    , value (Just HigherOrderCPS)
+    , value (Just Stackify)
     , completeWith runtimeValues
-    , showDefaultWith $ const "higher-order-cps"
+    , showDefaultWith $ const "stackify"
     , metavar "RUNTIME"
     ]
   sourceLanguage <- option languageReader . fold $
@@ -81,14 +79,6 @@ parser = do
     , showDefaultWith $ const "scheme"
     , metavar "LANGUAGE"
     ]
-  targetLanguage <- option languageReader . fold $
-    [ long "target"
-    , short 'T'
-    , value LanguageCPS
-    , completeWith languageValues
-    , showDefaultWith $ const "cps"
-    , metavar "LANGUAGE"
-    ]
   output <- strOption . fold $
     [ long "output"
     , short 'o'

src/Gyehoek/Scheme/Syntax.hs

@@ -10,7 +10,6 @@
 {-# LANGUAGE OrPatterns #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE DeriveAnyClass #-}
-{-# LANGUAGE ViewPatterns #-}
 module Gyehoek.Scheme.Syntax
   ( Name(..)
   , Prim(..)
@@ -54,8 +53,6 @@ import Gyehoek.Sexp.Grammar qualified as Sexp
 import Gyehoek.Sexp.Grammar qualified as S
 import Gyehoek.Sexp.Grammar (DatumIso, G, DataIso, (:-)((:-)))
 import Gyehoek.Prelude
-import Control.Lens.Extras (is)
-import qualified Data.Scientific as Sci
 
 
 newtype Name = MkName { inner :: Text }
@@ -84,8 +81,6 @@ data Prim e
   | PrimZeroP e
   | PrimNewline
   | PrimMakeClosure { code :: e, env :: List e }
-  | PrimMakeSharedClosure { codes :: List e, env :: List e }
-  | PrimGetEnv
   | PrimEnv
   | PrimEnvRef Int
   | PrimCallCC e
@@ -93,8 +88,6 @@ data Prim e
   | PrimInvokeCC e (List e)
   | PrimValues (List e)
   | PrimCallWithValues e e
-  | PrimPairP e
-  | PrimList (List e)
   deriving stock (Show, Generic, Functor, Foldable, Traversable, Data, Eq)
   deriving anyclass (NFData)
 
@@ -133,37 +126,8 @@ data CommandOrDef
   deriving stock (Show, Generic, Data)
   deriving anyclass (NFData)
 
-newtype LibName = MkLibName { inner :: NonEmpty Name }
+newtype Program = MkProgram
-  deriving stock (Show, Generic, Data)
+  { commandsAndDefs :: List CommandOrDef
-  deriving anyclass (NFData)
-
-data ImportSet
-  = ImportLib LibName
-  | ImportOnly ImportSet (NonEmpty Name)
-  | ImportExcept ImportSet (NonEmpty Name)
-  | ImportPrefix ImportSet Name
-  | ImportRename ImportSet (NonEmpty (Name, Name))
-  deriving stock (Show, Generic, Data)
-  deriving anyclass (NFData)
-
-newtype ImportDecl = MkImportDecl (NonEmpty ImportSet)
-  deriving stock (Show, Generic, Data)
-  deriving anyclass (NFData)
-
-data LibDecl
-  deriving stock (Show, Generic, Data)
-  deriving anyclass (NFData)
-
-data Lib = MkLib
-  { name :: LibName
-  , decls :: List LibDecl
-  }
-  deriving stock (Show, Generic, Data)
-  deriving anyclass (NFData)
-
-data Program = MkProgram
-  { imports :: List ImportDecl
-  , commandsAndDefs :: List CommandOrDef
   }
   deriving stock (Show, Generic, Data)
   deriving anyclass (NFData)
@@ -204,10 +168,6 @@ primDatumIso namefn a = S.match
     $ S.With (. ht1 "zero?")
     $ S.With (. ht0 "newline")
     $ S.With (. ht1' "make-closure")
-    $ S.With (. S.headTagged2 (namefn "make-shared-closure")
-      (S.list $ S.rest a)
-      (S.list $ S.rest a))
-    $ S.With (. ht0 "get-env")
     $ S.With (. ht0 "env")
     $ S.With (. S.headTagged1 (namefn "env-ref") S.int)
     $ S.With (. ht1 "call/cc")
@@ -215,8 +175,6 @@ primDatumIso namefn a = S.match
     $ S.With (. ht1' "invoke/cc")
     $ S.With (. ht0' "values")
     $ S.With (. ht2 "call-with-values")
-    $ S.With (. ht1 "pair?")
-    $ S.With (. ht0' "list")
     $ S.End
     where
       idn = S.el . S.sym . namefn
@@ -276,58 +234,8 @@ instance DatumIso CommandOrDef where
     $ S.With (\_Begin -> _Begin . S.beginLike "begin" (S.rest S.datumIso))
     $ S.End
 
-instance DatumIso LibName where
-  datumIso = S.with \g ->
-    S.list (S.restData $ S.nonEmptyData comp)
-    >>> g
-    where
-      comp = S.partialOsi
-        (\case
-          S.Symbol s -> Right $ MkName s
-          S.Number (Sci.floatingOrInteger @Double @Int -> Right n)
-            | n > 0 -> Right $ MkName [i|#{n}|]
-          _ -> Left $ S.expected "library name part"
-          )
-        \(MkName s) -> S.Symbol s
-
-instance DatumIso ImportSet where
-  datumIso = S.match
-    $ S.With (S.datumIso @LibName >>>)
-    $ S.With (imp "only" >>>)
-    $ S.With (imp "except" >>>)
-    $ S.With (imp' "prefix" >>>)
-    $ S.With (imp "rename" >>>)
-    $ S.End
-    where
-      imp s = S.list $ S.el (S.symBuiltin s)
-        >>> S.el S.datumIso >>> S.restData S.dataIso
-      imp' s = S.list $
-        S.el (S.symBuiltin s)
-        >>> S.el S.datumIso
-        >>> S.el S.datumIso
-
-instance DatumIso ImportDecl where
-  datumIso = S.with \decl ->
-    S.list (S.el (S.symBuiltin "import") >>> S.restData S.dataIso)
-    >>> decl
-
 instance DataIso Program where
-  dataIso = S.with \g ->
+  dataIso = S.dataIso @(List CommandOrDef) >>> S.iso coerce coerce
-    splitG
-    >>> S.onHead (S.sealed S.dataIso)
-    >>> S.onTail (S.onHead . S.sealed $ S.dataIso)
-    >>> g
-    where
-      isImport = \case
-        S.List (S.Symbol "import" : _) -> True
-        _ -> False
-      splitG :: G (List S.Datum :- t) (List S.Datum :- List S.Datum :- t)
-      splitG = S.Iso
-        (\(xs:-t) ->
-          let (ys,zs) = span isImport xs
-          in zs :- ys :- t
-        )
-        \(zs:-ys:-t) -> (ys ++ zs) :- t
 
 
 -- utilities

src/Gyehoek/Sexp/Grammar.hs

@@ -15,7 +15,6 @@ module Gyehoek.Sexp.Grammar
   , encodeDataTest
   , encodeDataTestColour
   , encodeOrShow'
-  , encodeOrShowData'
   , decodeDataWith
   , encodeDataWith'
   , decodeTest
@@ -29,8 +28,6 @@ module Gyehoek.Sexp.Grammar
   , fromDatumUnsafe
   , Control.Category.id
   , fromDataUnsafe
-  , writeDatum
-  , writeData
   )
   where
 
@@ -48,8 +45,6 @@ import qualified Control.Category
 import qualified Data.Vector as V
 import Data.String (IsString (fromString))
 import qualified Data.Text as T
-import System.Environment (lookupEnv)
-import Data.Foldable (toList)
 
 
 toDatum :: Jalmot :> es => DatumGrammar a -> a -> Eff es Datum
@@ -131,39 +126,6 @@ encodeOrShow' g x = fromString $
     Left _ -> show x
     Right t -> T.unpack t
 
-encodeOrShow :: (IsString s, Show a) => DatumGrammar a -> a -> s
-encodeOrShow g x = fromString $
-  case runPureEff . runJalmot . encodeWith g $ x of
-    Left _ -> show x
-    Right t -> T.unpack t
-
-encodeOrShowData' :: (IsString s, Show a) => DataGrammar a -> a -> s
-encodeOrShowData' g x = fromString $
-  case runPureEff . runJalmot . encodeDataWith' g $ x of
-    Left _ -> show x
-    Right t -> T.unpack t
-
-encodeOrShowData :: (IsString s, Show a) => DataGrammar a -> a -> s
-encodeOrShowData g x = fromString $
-  case runPureEff . runJalmot . encodeDataWith g $ x of
-    Left _ -> show x
-    Right t -> T.unpack t
-
-useColour :: IO Bool
-useColour = maybe True (const False) <$> lookupEnv "NO_COLOR"
-
-writeDatum :: (Show a, DatumIso a, MonadIO m) => a -> m ()
-writeDatum x = do
-  c <- liftIO useColour 
-  let f = if c then encodeOrShow else encodeOrShow'
-  liftIO . TIO.putStrLn . f datumIso $ x
-
-writeData :: (Show a, DataIso a, MonadIO m) => a -> m ()
-writeData x = do
-  c <- liftIO useColour 
-  let f = if c then encodeOrShowData else encodeOrShowData'
-  liftIO . TIO.putStrLn . f dataIso $ x
-
 class DatumIso a where
   datumIso :: DatumGrammar a
 
@@ -188,8 +150,5 @@ instance DatumIso a => DataIso (V.Vector a) where
   dataIso = iso fromList V.toList
     >>> (onHead . traversed . sealed $ datumIso @a)
 
-instance DatumIso a => DataIso (NonEmpty a) where
-  dataIso = nonEmptyData datumIso
-
 instance (DatumIso a, DatumIso b) => DatumIso (a, b) where
   datumIso = with \tup2 -> list (el datumIso >>> el datumIso) >>> tup2

src/Gyehoek/Sexp/Grammar/Base.hs

@@ -9,7 +9,7 @@ module Gyehoek.Sexp.Grammar.Base
   , DatumGrammar
   , DataGrammar
   , Grammar
-  , ListContext(..)
+  , ListContext
   , (:-)((:-))
   -- * lists
   , list
@@ -17,7 +17,6 @@ module Gyehoek.Sexp.Grammar.Base
   , el
   , rest
   , restData
-  , nonEmptyData
   , headTagged0'
   , headTagged0
   , headTagged1'
@@ -33,8 +32,6 @@ module Gyehoek.Sexp.Grammar.Base
   , integer
   , int
   , unreadable
-  -- ** symbols
-  , symBuiltin
   -- * TODO: sort lol
   , prismIso
   , isoIso, decorate
@@ -52,7 +49,7 @@ import Data.InvertibleGrammar.Base
 import Data.InvertibleGrammar.Base as Re
   ( Grammar(..))
 import Data.InvertibleGrammar.Combinators
-import Gyehoek.Prelude hiding (traversed, iso, cons, coerced, Iso, Simple, simple)
+import Gyehoek.Prelude hiding (iso, cons, coerced, Iso, Simple, simple)
 import Gyehoek.Sexp.Syntax hiding (position)
 import Gyehoek.Sexp.Print (printDatum')
 import Data.Scientific (Scientific)
@@ -60,7 +57,6 @@ import qualified Data.Scientific as Sci
 import qualified Data.Text as T
 import Control.Monad.RWS (modify)
 import qualified Data.List.NonEmpty as NE
-import Data.Foldable (toList)
 
 
 -- $setup
@@ -242,14 +238,6 @@ restData g =
   >>> g
   >>> push (MkListContext []) (const True) mempty
 
-nonEmptyData :: DatumGrammar a -> DataGrammar (NonEmpty a)
-nonEmptyData g = partialOsi
-    (\case
-      [] -> Left $ expected "non-empty sequence"
-      x:xs -> Right $ x:|xs)
-    toList
-  >>> (onHead . traversed . sealed $ g)
-
 snoced
   :: Snoc s s a a
   => Grammar p (s :- a :- t) (s :- t)

src/Gyehoek/Stack/Lower.hs

@@ -0,0 +1,29 @@
+module Gyehoek.Stack.Lower
+  ( lowerProgram
+  ) where
+
+import Gyehoek.Stack.Syntax
+import Gyehoek.Wasm qualified as Wasm
+import Gyehoek.Prelude
+import Gyehoek.Wasm (wat, watM)
+
+
+lowerRoutine :: Routine -> Wasm.Function
+lowerRoutine rt = _
+
+lowerBlock :: Block -> Wasm.Expr
+lowerBlock = _
+
+lowerInstr :: Instr -> Wasm.Expr
+lowerInstr = \case
+  -- PopCont ktail -> [wat|
+    
+  -- |]
+
+lowerProgram :: Program -> Eff es Wasm.Module
+lowerProgram p = pure [watM|
+  (module
+    ##{rs})
+|]
+  where
+    rs = p ^.. #routines . each . to lowerRoutine

src/Gyehoek/Stack/Syntax.hs

@@ -0,0 +1,150 @@
+{-# LANGUAGE TemplateHaskellQuotes #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE DeriveAnyClass #-}
+module Gyehoek.Stack.Syntax
+  ( Program(..)
+  , Routine(..)
+  , Instr(..)
+  , Block(..)
+  , Tail(..)
+  , Val(..)
+  , Lit(..)
+  , Obj(..)
+  , Imm(..)
+  , Hob(..)
+  , Prim(..)
+  , Name(..)
+  , Reg(..)
+  , Label(..)
+  , pattern ValLabel
+  , pattern ObjLabel
+  , stkP
+  ) where
+
+import Control.Lens
+import qualified Gyehoek.Sexp as S
+import Gyehoek.Scheme.Syntax (Name(..), Lit(..), Prim(..))
+import GHC.Exts (IsList(..))
+import Data.List (intersperse)
+import Gyehoek.CPS.Syntax (Imm(..), Obj(..), Hob(..), pattern ObjLabel, Reg, Label)
+import Gyehoek.Prelude
+import Gyehoek.Sexp ((:-)((:-)))
+
+
+newtype Program = MkProgram
+  { routines :: HashMap Label Routine
+  }
+  deriving stock (Show, Generic, Data)
+  deriving newtype (Semigroup, Monoid)
+  deriving anyclass (NFData)
+
+instance IsList Program where
+  type Item Program = Routine
+  fromList rs = MkProgram
+    { routines = fromList [ (r.label, r) | r <- rs ]
+    }
+  toList = toListOf $ #routines . each
+
+data Routine = MkRoutine
+  { label :: Label
+  , start :: Block
+  }
+  deriving stock (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Block = MkBlock
+  { code :: List Instr
+  , tail :: Tail
+  }
+  deriving stock (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Tail
+  -- | call the procedure at stack index `n` supplied with `n`
+  -- arguments on top of the stack, then return by calling the
+  -- continuation at stack index `n+1`.
+  = TailCall Int
+  | Call Int
+  | If Val Block Block
+  | Return Int
+  | CallCC
+  deriving stock (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Instr
+  = Pop Reg
+  | Push Val
+  | Load Reg Int
+  | Prim (Prim Val)
+  deriving stock (Show, Generic, Data)
+  deriving anyclass (NFData)
+
+data Val
+  = ValReg Reg
+  | ValImm Imm
+  deriving stock (Show, Generic, Data, Eq)
+  deriving anyclass (NFData)
+
+pattern ValLabel :: Label -> Val
+pattern ValLabel x = ValImm (ImmLabel x)
+
+
+--- sexp work
+
+pure []
+
+instance S.DatumIso Instr where
+  datumIso = S.match
+    $ S.With (S.headTagged1 "pop!" S.datumIso >>>)
+    $ S.With (S.headTagged1 "push!" S.datumIso >>>)
+    $ S.With (S.headTagged2 "load" S.datumIso S.datumIso >>>)
+    $ S.With (S.headTagged1 "prim" S.datumIso >>>)
+    $ S.End
+    where
+
+instance S.DataIso Block where
+  dataIso = S.with \g ->
+    S.flipped S.snoced
+    >>> S.onHead (S.traversed $ S.sealed S.datumIso)
+    >>> S.onTail (S.datumIso @Tail)
+    >>> S.swap
+    >>> g
+
+instance S.DatumIso Tail where
+  datumIso = S.match
+    $ S.With (S.headTagged1 "tail-call" S.datumIso >>>)
+    $ S.With (S.headTagged1 "call" S.datumIso >>>)
+    $ S.With (if_ >>>)
+    $ S.With (S.headTagged1 "return" S.datumIso >>>)
+    $ S.With (S.headTagged0 "call/cc" >>>)
+    $ S.End
+    where
+      -- if_ = S.ifLike "if" (S.datumIso @Val) S.datumIso S.datumIso
+      if_ = S.ifLike "if" (S.datumIso @Val) (branch "then") (branch "else")
+      branch :: Text -> S.DatumGrammar Block
+      branch s =
+        S.listWithIndentation (S.NSpecial 0) $
+            S.el (S.decorate S.SynBuiltin >>> S.sym s)
+            >>> S.restData (S.dataIso @Block)
+
+instance S.DatumIso Val where
+  datumIso = S.match
+    $ S.With (S.datumIso >>>)
+    $ S.With (S.datumIso >>>)
+    $ S.End
+
+instance S.DatumIso Routine where
+  datumIso = S.with \rout ->
+      S.listWithIndentation (S.NSpecial 1)
+       ( S.el (S.decorate S.SynBuiltin >>> S.sym "define")
+       >>> S.el (S.datumIso @Label)
+       >>> S.restData (S.dataIso @Block)
+       )
+      >>> rout
+
+instance S.DataIso Program where
+  dataIso = S.dataIso @(List Routine) >>> S.iso fromList toList
+
+stkP :: S.QuasiQuoter
+stkP = S.makeSxs [|| S.fromDataUnsafe (S.dataIso @Program) ||]

src/Gyehoek/Stack/VM.hs

@@ -0,0 +1,521 @@
+{-# LANGUAGE ViewPatterns, MultilineStrings #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE DeriveAnyClass #-}
+module Gyehoek.Stack.VM
+  ( VM(..)
+  , Env(..)
+  , eval
+  , trace
+  , module Gyehoek.Stack.Syntax
+  , writeObj
+  , traceEval
+  ) where
+
+import Gyehoek.Stack.Syntax
+import Control.Lens
+import qualified Data.HashMap.Strict as H
+import Data.List (unfoldr, intersperse, compareLength)
+import Gyehoek.Prelude
+import qualified Data.List.NonEmpty as NE
+import Lucid
+import Data.Foldable (traverse_)
+import qualified Gyehoek.Sexp as S
+import Gyehoek.Jalmot
+import Text.Pretty.Simple (pStringNoColor, pShowNoColor)
+import Effectful.State.Static.Local (runState, evalState, get)
+import Data.Traversable
+import Control.Applicative (Alternative(..))
+import Gyehoek.Sexp.Print (htmlData)
+import Control.DeepSeq (deepseq, ($!!))
+import Gyehoek.Sexp.Print (htmlData, htmlDatum)
+import Control.DeepSeq (deepseq, ($!!))
+import Data.String (fromString)
+import Data.Monoid (First)
+import GHC.Stack (popCallStack)
+import Data.Maybe (fromMaybe)
+
+
+-- | non-essential information maintained only to aide in debugging.
+data DebugVM = MkDebugVM
+  { activeRoutine :: Label
+  }
+  deriving (Show, Generic)
+
+newtype Frame = MkFrame { locals :: List Obj }
+  deriving stock (Show, Generic)
+
+-- affine
+returnAddress :: Traversal' Frame Obj
+returnAddress = #locals . _last
+
+-- affine
+activeProcedure :: Traversal' Frame Obj
+activeProcedure = #locals . _init . _last
+
+newtype Stack = MkStack { frames :: NonEmpty Frame }
+  deriving stock (Show, Generic)
+
+data VM = MkVM
+  { stack :: Stack
+  , code :: List Instr
+  , tail :: Tail
+  , registers :: HashMap Reg Obj
+  , stdout :: Text
+  , result :: Maybe (List Obj)
+  , debug :: DebugVM
+  }
+  deriving (Show, Generic)
+
+type instance Index Frame = Int
+type instance IxValue Frame = Obj
+
+instance Ixed Frame where
+  ix j = wrappedIso . ix j
+
+instance Cons Frame Frame Obj Obj where
+  _Cons = prism'
+    (\(x,MkFrame xs) -> MkFrame (x:xs))
+    \case
+      MkFrame (x:xs) -> Just (x, MkFrame xs)
+      MkFrame [] -> Nothing
+
+instance Each Frame Frame Obj Obj where each = wrappedIso . each
+
+instance Each Stack Stack Frame Frame where each = wrappedIso . each
+
+pushes :: Foldable f => f Obj -> Frame -> Frame
+pushes = flip $ foldr cons
+
+_NonEmpty :: Iso (NonEmpty a) (NonEmpty b) (a, List a) (b, List b)
+_NonEmpty = iso
+  (\(x:|xs) -> (x,xs))
+  (\(x,xs) -> x:|xs)
+
+pushFrame :: Frame -> Stack -> Stack
+pushFrame f (MkStack xs) = MkStack $ NE.cons f xs
+
+activeFrame :: Lens' VM Frame
+activeFrame = #stack . #frames . _NonEmpty . _1
+
+data Env = MkEnv
+  { labels :: HashMap Label Routine
+  }
+  deriving (Show, Generic)
+
+step :: Jalmot :> es => Env -> VM -> Eff es VM
+step g vm = case vm ^. #code of
+  c:cs -> stepI g (vm & #code .~ cs) c
+  [] -> stepT g vm vm.tail
+
+vmerror :: (HasCallStack, Jalmot :> es) => Text -> Eff es a
+vmerror = throwError . VMError
+
+stepI :: Jalmot :> es => Env -> VM -> Instr -> Eff es VM
+
+stepI e vm (Load r j) = do
+  x <- expectOf [i|object at index #{j}|] (activeFrame . ix j) vm
+  pure $ vm & #registers . at r ?~ x
+
+stepI e vm (Push v) = traverseOf activeFrame push vm
+  where push xs = cons <$> evalVal e vm v <*> pure xs
+
+stepI g vm (Prim p) = stepP g vm p
+
+stepI e vm (Pop r) = case vm ^? activeFrame . _Cons of
+  Nothing -> vmerror "empty stack"
+  Just (x,xs) -> pure $ vm & #registers . at r ?~ x
+               & activeFrame .~ xs
+
+stepI e vm ins = vmerror [i|unimplemented instruction: #{ins}|]
+
+stepT :: Jalmot :> es => Env -> VM -> Tail -> Eff es VM
+
+stepT g vm tc@(Call nargs) = do
+  (args,f,ret,frm) <- parseCall nargs (vm ^. activeFrame)
+    & expectOf [i|bad call: #{show tc}|] _Just
+  rt <- getRoutine g f
+  let newFrame = MkFrame $ args ++ [f,ret]
+  pure $ vm
+    & jumpToRoutine rt
+    & activeFrame .~ frm
+    -- it is not essential we clear the registers, but it'll
+    -- make bugs more obvious.
+    & #registers .~ mempty
+    & #stack %~ \stk ->
+      case f of
+        ObjHob (HobContinuation {stack}) ->
+          coerce $ stack & _NonEmpty . _1 <>:~ (args ++ [f])
+        _ -> pushFrame newFrame stk
+
+stepT g vm tc@(Return nret) = do
+  (xs,_) <- splitAtExact nret (vm ^. activeFrame . #locals)
+    & expectOf [i|bad return: #{show tc}|] _Just
+  expectOf [i|no return addr|] (activeFrame . returnAddress) vm >>= \case
+    ObjLabel "halt" -> pure $ vm & #result ?~ xs
+    ra -> do
+      rt <- getRoutine g ra
+      vm & traverseOf #stack (fmap snd . popFrame)
+         & mapped . activeFrame %~ pushes xs
+         & mapped %~ jumpToRoutine rt
+         -- it is not essential we clear the registers, but it'll make
+         -- bugs more obvious.
+         & mapped . #registers .~ mempty
+
+stepT g vm tc@(TailCall nargs) = do
+  (args,f,ra) <- parseTailCall nargs (vm ^. activeFrame)
+    & expectOf [i|bad call: #{show tc}|] _Just
+  case f of
+    ObjLabel "halt" -> pure $ vm & #result ?~ args
+    _ -> do
+      rt <- getRoutine g f
+      let newFrame = MkFrame $ args ++ [f, ra]
+      pure $ vm
+        & jumpToRoutine rt
+        -- replace the active frame; don't push a new one.
+        & activeFrame .~ newFrame
+        -- it is not essential we clear the registers, but it'll make
+        -- bugs more obvious.
+        & #registers .~ mempty
+
+stepT g vm (If c t f) = do
+  branch <- evalVal g vm c <&> \case
+      ObjImm (ImmBool False) -> f
+      _ -> t
+  pure $ jumpToBlock branch vm
+
+stepT g vm CallCC = do
+  (cc,withcc,frm) <- parseCallCC (vm ^. activeFrame)
+    & expectOf "bad call/cc" _Just
+  let stk = vm.stack & #frames . _NonEmpty . _1 .~ frm
+  let reified_cc = ObjHob $ HobContinuation cc (coerce stk)
+  let newFrame = MkFrame [reified_cc, withcc, cc]
+  rt <- getRoutine g withcc
+  pure $ vm
+    & jumpToRoutine rt
+    -- replace the active frame; don't push a new one.
+    & activeFrame .~ newFrame
+    -- it is not essential we clear the registers, but it'll make
+    -- bugs more obvious.
+    & #registers .~ mempty
+
+stepP :: Jalmot :> es => Env -> VM -> Prim Val -> Eff es VM
+stepP g vm p = traverse (evalVal g vm) p >>= \case
+  PrimZeroP x -> case x of
+    ObjImm (ImmInt n) -> ret1 . ObjImm . ImmBool $ n == 0
+    _ -> vmerror [i|bad arg to zero?: #{x}|]
+  PrimAdd x y -> arith_binop (+) x y
+  PrimMul x y -> arith_binop (*) x y
+  PrimSub x y -> arith_binop (-) x y
+  PrimDiv x y -> arith_binop div x y
+  PrimMakeClosure f env ->
+    case f of
+      ObjImm (ImmLabel l) -> ret1 . ObjHob $ HobClosure l env
+      _ -> vmerror [i|expected label, got #{f}|]
+  PrimEnv -> do
+    x <- vm & expectOf "expected closure" (activeFrame . activeProcedure)
+    ret1 x
+  PrimEnvRef n -> do
+    (label,env) <- vm & expectOf "expected closure"
+        (activeFrame . activeProcedure . #_ObjHob . #_HobClosure) 
+    x <- env & expectOf "expected upval" (ix n)
+    ret1 x
+  PrimCons x y -> ret1 $ ObjHob $ HobPair x y
+  PrimCar x -> case x of
+      ObjHob (HobPair car _) -> ret1 car
+      _ -> vmerror [i|expected pair, got ${x}|]
+  PrimCdr x -> case x of
+      ObjHob (HobPair _ cdr) -> ret1 cdr
+      _ -> vmerror [i|expected pair, got ${x}|]
+  -- PrimCaptureCC -> do
+  --   label <- vm & expectOf [i|bad stack, no return addr|]
+  --     (activeFrame . returnAddress . #_ObjImm . #_ImmLabel)
+  --   ret1 . ObjHob $ HobContinuation { label }
+  x -> vmerror [i|unimplemented prim: #{p}|]
+  where
+    ret vs = pure $ vm & activeFrame . #locals <>:~ vs
+    ret1 v = ret [v]
+    arith_binop op (ObjImm (ImmInt x)) (ObjImm (ImmInt y)) =
+      ret1 $ ObjImm (ImmInt (op x y))
+    arith_binop _ x y = vmerror [i|bad arith: #{x}, #{y}|]
+
+
+
+popFrame :: (HasCallStack, Jalmot :> es) => Stack -> Eff es (Frame, Stack)
+popFrame stk = case stk ^. #frames . to NE.uncons of
+  (_, Nothing) -> vmerror "no frame to pop"
+  (f, Just fs) -> pure (f, stk & #frames .~ fs)
+
+jumpToBlock :: Block -> VM -> VM
+jumpToBlock b vm = vm
+  & #code .~ b.code
+  & #tail .~ b.tail
+
+jumpToRoutine :: Routine -> VM -> VM
+jumpToRoutine rt vm = vm
+  & jumpToBlock rt.start
+  & #debug . #activeRoutine .~ rt.label
+
+getLabel :: Obj -> Maybe Label
+getLabel = \case
+  ObjHob (HobClosure {label}) -> Just label
+  ObjHob (HobContinuation {cont}) -> getLabel cont
+  ObjImm (ImmLabel label) -> Just label
+  x -> Nothing
+
+getRoutine :: (HasCallStack, Jalmot :> es) => Env -> Obj -> Eff es Routine
+getRoutine g f = do
+  l <- getLabel f & expectOf [i|no label for #{f}|] _Just
+  case g ^. #labels . at l of
+    Just rt -> pure rt
+    Nothing -> vmerror [i|undefined label #{l}|]
+
+expectOf
+  :: (HasCallStack, Jalmot :> es)
+  => Text -> Getting (First a) s a -> s -> Eff es a
+expectOf msg l = maybe (vmerror msg) pure . preview l
+
+evalToLabel :: Jalmot :> es => Env -> VM -> Val -> Eff es Label
+evalToLabel e vm v =
+  evalVal e vm v >>= \case
+    ObjImm (ImmLabel x) -> pure x
+    x -> vmerror [i|not a label: #{x}|]
+
+evalVal :: Jalmot :> es => Env -> VM -> Val -> Eff es Obj
+evalVal e vm = \case
+  ValImm imm -> pure $ ObjImm imm
+  ValReg r -> case vm ^. #registers . at r of
+    Just x -> pure x
+    Nothing -> vmerror [i|undefined register: #{r}|]
+
+splitAtExact :: Int -> List a -> Maybe (List a, List a)
+splitAtExact n xs = case compareLength xs n of
+  (EQ;GT) -> Just $ splitAt n xs
+  LT -> Nothing
+
+takeExact :: Int -> List a -> Maybe (List a)
+takeExact n xs = case compareLength xs n of
+  (EQ;GT) -> Just $ take n xs
+  LT -> Nothing
+
+parseCallCC :: Frame -> Maybe (Obj, Obj, Frame)
+parseCallCC frm = do
+  ([cc,withcc],ys) <- splitAtExact 2 (frm ^. #locals)
+  pure (cc,withcc,MkFrame ys)
+
+parseCall :: Int -> Frame -> Maybe (List Obj, Obj, Obj, Frame)
+parseCall nargs frm = do
+  (xs,ys) <- splitAtExact (nargs+2) (frm ^. #locals)
+  let (xs',[f,ret]) = splitAt nargs xs
+  pure (xs',f,ret,MkFrame ys)
+
+parseTailCall :: Int -> Frame -> Maybe (List Obj, Obj, Obj)
+parseTailCall nargs frm = do
+  (xs,_) <- splitAtExact (nargs+1) (frm ^. #locals)
+  let (xs',f) = xs ^?! _Snoc
+  pure (xs',f,frm ^?! returnAddress)
+
+initialVM :: VM
+initialVM = MkVM
+  { stack = MkStack . NE.singleton . MkFrame $
+    [ ObjLabel "start"
+    , ObjLabel "<nowhere at all>"
+    , ObjLabel "halt"
+    ]
+  , tail = TailCall 0
+  , code = []
+  , registers = mempty
+  , stdout = ""
+  , result = Nothing
+  , debug = MkDebugVM
+    { activeRoutine = "<nowhere>"
+    }
+  }
+
+initialEnv :: Program -> Env
+initialEnv p = MkEnv
+  { labels = p.routines
+  }
+
+loop :: (a -> Either b a) -> a -> b
+loop f a = case f a of
+  Right a' -> loop f a'
+  Left b -> b
+
+loopM :: Monad m => (a -> m (Either b a)) -> a -> m b
+loopM f a = f a >>= \case
+  Right a' -> loopM f a'
+  Left b -> pure b
+
+eval :: Jalmot :> es => Program -> Eff es (List Obj)
+eval p = initialVM & loopM \vm -> case vm ^. #result of
+  Nothing -> Right <$> step (initialEnv p) vm
+  Just rs -> pure . Left $ rs
+
+data Trace
+  = Step { vm :: VM, next :: Trace }
+  | StepToSuccess { vm :: VM, result :: List Obj }
+  | StepToFailure { vm :: VM, err :: AJalmotCS }
+  deriving (Show)
+
+trace :: Program -> Trace
+trace p = go (initialEnv p) initialVM
+  where
+    go g vm =
+      case vm.result of
+        Just rs -> StepToSuccess vm rs
+        Nothing ->
+          case runPureEff . runJalmotCS $ step g vm of
+            Left err -> StepToFailure vm err
+            Right vm' -> Step vm (go g vm')
+
+writeObj :: Obj -> Text
+writeObj = runJalmotUnsafe . S.encodeWith' S.datumIso
+
+traceEval :: IOE :> es => Program -> Eff es ()
+traceEval p = do
+  let t = trace p
+  liftIO . renderToFile "trace.html" . ppDoc p $ t
+
+ppDoc :: Program -> Trace -> Html ()
+ppDoc p t =
+  html_ do
+    head_ do
+      title_ "stackify trace"
+      style_ """
+        pre {
+          max-width: 95vw;
+          overflow: scroll;
+        }
+        table {
+          max-width: 95vw;
+        }
+        tbody > tr:nth-of-type(even) {
+            background-color: rgb(237 238 242);
+        }
+        .loc {
+            font-size: 0.8rem;
+        }
+        .syn-builtin, .syn-macro {
+            color: purple;
+            font-style: italic;
+            font-weight: bold;
+        }
+        .syn-constant {
+            color: olive;
+        }
+        .syn-procedure {
+            color: teal;
+        }
+        td pre {
+          display: inline
+        }
+        .syn-paren-0 { color: maroon; }
+        .syn-paren-1 { color: olive; }
+        .syn-paren-2 { color: green; }
+        .syn-paren-3 { color: navy; }
+        .syn-paren-4 { color: purple; }
+        .stack-frame
+        { display: inline-flex
+        ; flex-direction: row
+        ; column-gap: 0.5em
+        }
+      """
+    body_ do
+      details_ do
+        summary_ "stack code"
+        pre_ $ code_ do
+          htmlData . runJalmotUnsafe . S.toData S.dataIso $ p
+      ppTrace t
+
+ppTrace :: Trace -> Html ()
+ppTrace trace =
+  table_ do
+    thead_ $ tr_ do
+      traverse_ (th_ [scope_ "col"])
+        ["routine","next instruction","stack frame"]
+    tbody_ do
+      go trace
+  where
+    go :: Trace -> Html ()
+    go = \case
+      Step vm next -> ppVM vm >> go next
+      StepToSuccess vm rs -> do
+        tr_ [class_ "trace-result"] do
+          td_ do
+            details_ do
+              summary_ "result"
+              pre_ do
+                code_ . toHtml . pShowNoColor $ vm
+          td_ [colspan_ "2"] do
+            sequence_ . intersperse " | " $ code_ . ppDatum <$> rs
+      StepToFailure vm err -> do
+        ppVM vm
+        tr_ [class_ "trace-failure"] do
+          td_ [colspan_ "3"] do
+            details_ do
+              summary_ "error"
+              pre_ do
+                samp_ do
+                  fromString $ displayException err
+
+ppVM :: VM -> Html ()
+ppVM vm = do
+  tr_ do
+    td_ do
+      details_ do
+        summary_ do
+          var_ [class_ "loc"] do
+            vm ^. #debug . #activeRoutine . to ppDatum
+        pre_ do
+          code_ . toHtml . pShowNoColor $ vm
+    td_ do
+      code_ curi
+    td_ do
+      ppStack vm.stack
+  where
+    curi = vm ^?! failing (#code . _head . to ppDatum) (#tail . to ppDatum)
+
+ppStack :: Stack -> Html ()
+ppStack stk = do
+  span_ [class_ "stack"] do
+    stk ^.. each
+      & fmap ppFrame
+      & intersperse " | "
+      & sequence_
+
+ppFrame :: Frame -> Html ()
+ppFrame frm = do
+  span_ [class_ "stack-frame"] do
+    sequence_ $ frm ^.. #locals . each . to ppDatum
+
+ppData :: S.DataIso a => a -> Html ()
+ppData = htmlData . runJalmotUnsafe . S.toData S.dataIso
+
+ppDatum :: S.DatumIso a => a -> Html ()
+ppDatum = htmlDatum . runJalmotUnsafe . S.toDatum S.datumIso
+
+fac (n :: Int) = [stkP|
+(define $start
+  (push! $fac)
+  (push! #{n})
+  (tail-call 1))
+
+(define $fac
+  (load %n 0)
+  (prim %x0 (zero? %n))
+  (if %x0
+      (then (push! 1)
+            (return 1))
+      (else (prim %x1 (- %n 1))
+            (push! $fac-c0)
+            (push! $fac)
+            (push! %x1)
+            (call 1))))
+
+(define $fac-c0
+  (pop! %x2)
+  (pop! %n)
+  (prim %x3 (* %n %x2))
+  (push! %x3)
+  (return 1))
+|]

src/Gyehoek/Wasm.hs

@@ -1,3 +1,4 @@
+{- HLINT ignore "Use newtype instead of data" -}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE TemplateHaskellQuotes #-}

test/Gyehoek/Test/CPS/Eval.hs

@@ -5,75 +5,53 @@ import Test.Tasty.HUnit
 import Gyehoek.CPS.Syntax (cps, Obj(..), Hob(..), Imm(..))
 import Gyehoek.CPS.Eval qualified as Sut
 import Data.List (List)
-import Test.Tasty.ExpectedFailure (ignoreTestBecause, expectFail)
+import Test.Tasty.ExpectedFailure (ignoreTestBecause)
-import System.Directory (listDirectory)
-import Test.Tasty.Silver
-import System.FilePath
-import Control.Exception
-import qualified Gyehoek.Driver as Driver
-import Control.DeepSeq (($!!))
-import System.Exit (ExitCode(..))
-import qualified Data.Text as T
-import Data.Function (applyWhen)
-import Gyehoek.Prelude
 
 
-brokenEvalTests :: List String
+test_cpsInterpreter =
-brokenEvalTests =
+  ignoreTestBecause "i forgorrrr" $
-  []
+  testGroup "cps interpreter" $
-  -- [ "adder"
+  [ primitives
-  -- , "apply2"
+  , testCase "halt with constant" do
-  -- , "apply-twice"
+      evalsTo [ObjImm (ImmInt 123)] [cps|
-  -- , "arith"
+        (continue halt 123)
-  -- , "begin-1"
+      |]
-  -- , "callcc-constant"
+  , testCase "identity cont" do
-  -- , "callcc-discard"
+      evalsTo [ObjImm (ImmInt 154)] [cps|
-  -- , "callcc-early-exit-1"
+        (letrec ((id (κ (x)
-  -- , "callcc-early-exit-2"
+                       (continue halt x))))
-  -- , "callcc-early-exit-3"
+          (continue id 154))
-  -- , "callcc-early-exit-4"
+      |]
-  -- , "callcc-early-exit-5"
+  , testCase "identity function" do
-  -- , "callcc-early-exit-6"
+      evalsTo [ObjImm (ImmInt 456)] [cps|
-  -- , "callcc-nested-1"
+        (letrec ((id (λ (x ktail)
-  -- , "callcc-nested-2"
+                       (continue ktail x))))
-  -- , "complicated-1"
+          (id 456 halt))
-  -- , "cons-1"
+      |]
-  -- , "factorial"
+  , testCase "square" do
-  -- , "false"
+      evalsTo [ObjImm (ImmInt 81)] [cps|
-  -- , "fn-of-fn"
+        (letrec ((square (λ (x ktail)
-  -- , "if-false"
+                           (prim (* x x)
-  -- , "if-number"
+                             (κ (r) (continue ktail r))))))
-  -- , "if-true"
+          (square 9 halt))
-  -- , "lambda"
+      |]
-  -- , "letrec-fn"
-  -- , "let-fn"
-  -- , "lit-int"
-  -- , "square"
-  -- , "true"
-  -- ]
-
-test_eval :: IO TestTree
-test_eval = do
-  cs <- listDirectory "golden/exec"
-      <&> fmap ("golden/exec" </>)
-  pure $ testGroup "cps interpreter"
-    [ testGroup "higher-order" $ cpsCase Driver.eval_cps2_e2e <$> cs
-    -- , testGroup "first-order" $ cpsCase Driver.eval_cps1_e2e <$> cs
   ]
 
-maybeBroken name broken = applyWhen (name `elem` broken) expectFail
+evalsTo :: HasCallStack => List Obj -> Sut.Exp -> Assertion
+evalsTo rs e = Sut.evalExp e @?= rs
 
-cpsCase :: (FilePath -> IO Text) -> FilePath -> TestTree
+primitives = testGroup "primitives"
-cpsCase f test =
+  [ testGroup "arith"
-  maybeBroken testName brokenEvalTests $
+    [ testCase "basic 1" do
-    goldenVsAction testName resultFile action printProcResult
+        evalsTo [ObjImm (ImmInt 20)] [cps|
-  where
+          (prim (* 4 5)
-    testName = takeFileName test
+            (κ (x) (continue halt x)))
-    resultFile = test </> "exec"
+          |]
-    sourceFile = test </> "source.scm"
+    , testCase "basic 2" do
-    action = catch @SomeException
+        evalsTo [ObjImm (ImmInt 35)] [cps|
-      (do r <- f sourceFile
+          (prim (* 2 16)
-          pure $!! ( ExitSuccess
+            (κ (x) (prim (+ x 3)
-                   , r
+                      (κ (r) (continue halt r)))))
-                   , "" ))
+          |]
-      \e -> pure (ExitFailure 1, "", T.pack $ displayException e)
+    ]
+  ]

test/Gyehoek/Test/CPS/Stackify.hs

@@ -0,0 +1,95 @@
+module Gyehoek.Test.CPS.Stackify where
+
+import Test.Tasty (TestTree, testGroup)
+import Test.Tasty.HUnit
+import qualified Gyehoek.CPS.Stackify as Sut
+import Gyehoek.Stack.VM as Stk
+import Gyehoek.CPS.Syntax (cps)
+import Gyehoek.CPS.Syntax qualified as CPS
+import Gyehoek.GenSym (runGenSym)
+import Effectful
+import Gyehoek.Prelude
+import Gyehoek.Jalmot
+
+
+test_stackify =
+  [ trivialReturn
+  , tailCall
+  , prim
+  , condition
+  , procedure
+  ]
+
+evalsTo :: HasCallStack => List Obj -> Sut.Program -> Assertion
+evalsTo rs e = runJalmotUnsafe (Stk.eval e') @?= rs
+  where
+    e' = e & Sut.stackifyProgram & runGenSym & runPureEff
+
+trivialReturn = testGroup "trivial return"
+  [ testCase "return int" do
+      evalsTo [ObjImm (ImmInt 4)]
+        [cps|(λ (ktail) (continue ktail 4))|]
+  , testCase "return bool" do
+      evalsTo [ObjImm (ImmBool True)]
+        [cps|(λ (ktail) (continue ktail #t))|]
+      evalsTo [ObjImm (ImmBool False)]
+        [cps|(λ (ktail) (continue ktail #f))|]
+  ]
+
+tailCall = testGroup "tail call"
+  [ testCase "square" do
+      evalsTo [ObjImm (ImmInt 16)] [cps|
+        (λ (ktail0)
+          (letrec ((square (λ (x ktail)
+                             (prim (* x x)
+                               (κ (x0) (continue ktail x0))))))
+            (square 4 halt)))
+      |]
+  ]
+
+prim = testGroup "prim"
+  [ testCase "multiply" do
+      evalsTo [ObjImm (ImmInt 20)]
+        [cps|(λ (ktail0)
+            (prim (* 4 5)
+               (κ (x) (continue ktail0 x))))|]
+  , testCase "add" do
+      evalsTo [ObjImm (ImmInt 9)]
+        [cps|(λ (ktail0)
+        (prim (+ 4 5)
+               (κ (x) (continue ktail0 x))))|]
+  -- , testGroup "call/cc"
+  --   [ testCase "trivial" do
+  --       evalsTo [ObjImm (ImmInt 123)]
+  --         [cps|(letrec ((f (λ (cc ktail) (continue cc 123))))
+  --                (prim (call/cc f)))|]
+  --   ]
+  ]
+
+condition = testCase "if" do
+  evalsTo [ObjImm (ImmInt 123)]
+    [cps|(λ (ktail0)
+      (if #t (continue ktail0 123) (continue ktail0 456)))|]
+  evalsTo [ObjImm (ImmInt 456)]
+    [cps|(λ (ktail0)
+      (if #f (continue ktail0 123) (continue ktail0 456)))|]
+
+procedure = testGroup "procedure"
+  [ testCase "factorial" do
+      evalsTo [ObjImm (ImmInt 720)]
+        [cps|(λ (ktail0)
+          (letrec ((fac (λ (n ktail)
+                             (prim (zero? n)
+                               (κ (x0)
+                                 (if x0
+                                   (continue ktail 1)
+                                   (prim (- n 1)
+                                     (κ (x1)
+                                       (letrec ((fac-k0
+                                                  (κ (x2)
+                                                    (prim (* n x2)
+                                                      (κ (x3)
+                                                        (continue ktail x3))))))
+                                         (fac x1 fac-k0))))))))))
+               (fac 6 halt)))|]
+  ]

test/Gyehoek/Test/CPS/Syntax.hs

@@ -46,9 +46,9 @@ qq = testGroup "parser"
   , testCase "application" do
       assertEqual "" (Sut.ExpApply (Sut.ValVar "f")
                      [Sut.ValVar "x",Sut.ValVar "y"]
-                     (Sut.KexpVar "k"))
+                     "k")
         [cps|(f x y k)|]
       assertEqual "" (Sut.ExpApply (Sut.ValVar "f")
-                     [] (Sut.KexpVar "k"))
+                     [] "k")
         [cps|(f k)|]
   ]

test/Gyehoek/Test/Golden.hs

@@ -0,0 +1,84 @@
+module Gyehoek.Test.Golden where
+
+import Test.Tasty (TestTree, testGroup)
+import Test.Tasty.Silver
+import Gyehoek.Driver qualified as Driver
+import System.FilePath
+import Data.List (List)
+import Data.Functor ((<&>))
+import System.Directory
+import Data.Function
+import System.Environment.Blank (getEnvDefault)
+import qualified System.Process.Text as PT
+import Control.Exception (SomeException (SomeException), Exception (..), catch)
+import Gyehoek.Stack.VM (writeObj)
+import Data.Text qualified as T
+import System.Exit (ExitCode(..))
+import Test.Tasty.ExpectedFailure (expectFail, ignoreTestBecause)
+import Control.DeepSeq (($!!))
+import Text.Pretty.Simple (pShow, pShowNoColor)
+import Control.Lens (strict, view)
+import Gyehoek.Sexp.Read qualified as Read
+import Effectful
+
+
+brokenWasmTests :: List String
+brokenWasmTests =
+  [
+  ]
+
+brokenStackifyTests :: List String
+brokenStackifyTests =
+  [
+  ]
+
+test_root :: IO TestTree
+test_root = do
+  all_cases <- listDirectory "golden/exec"
+  let tests = all_cases
+            & fmap ("golden/exec"</>)
+  testGroup "execution" <$> sequenceA
+    [ ignoreTestBecause "wasm codegen is on the backburner"
+      <$> wasmTests tests
+    , stackifyTests tests
+    ]
+
+maybeBroken name broken = applyWhen (name `elem` broken) expectFail
+
+wasmTests :: List FilePath -> IO TestTree
+wasmTests files = do
+  cmd <- getEnvDefault "GYEHOEK_WASM_RUNTIME"
+    "runtime/target/debug/gyehoek-wasm-runtime"
+  pure $ testGroup "wasm" $ files <&> \test ->
+    let testname = takeFileName test
+        scmfile = test </> "source.scm"
+        resultfile = test </> "exec"
+        action = do
+          t <- Driver.lower_e2e scmfile
+          PT.readProcessWithExitCode cmd ["-"] t
+    in maybeBroken testname brokenWasmTests $
+      goldenVsAction
+       testname
+       resultfile
+       action
+       printProcResult
+
+stackifyTests :: List FilePath -> IO TestTree
+stackifyTests files = do
+  pure $ testGroup "stackified" $ files <&> \test ->
+    let testname = takeFileName test
+        scmfile = test </> "source.scm"
+        resultfile = test </> "exec"
+        action =
+          catch @SomeException
+            (do rs <- Driver.eval_e2e scmfile
+                pure $!! ( ExitSuccess
+                     , T.unwords . fmap writeObj $ rs
+                     , "" ))
+            \e -> pure (ExitFailure 1, "", T.pack $ displayException e)
+    in maybeBroken testname brokenStackifyTests $
+     goldenVsAction
+       testname
+       resultfile
+       action
+       printProcResult

test/Gyehoek/Test/Stack/VM.hs

@@ -0,0 +1,111 @@
+{-# LANGUAGE OverloadedLists #-}
+module Gyehoek.Test.Stack.VM where
+
+import Test.Tasty (TestTree, testGroup)
+import Test.Tasty.HUnit
+import Gyehoek.Stack.Syntax
+import Gyehoek.Stack.VM qualified as Sut
+import Data.List (List)
+import Gyehoek.Jalmot
+import Gyehoek.Prelude (i)
+
+
+evalsTo :: List Obj -> Program -> Assertion
+evalsTo rs p = runJalmotUnsafe (Sut.eval p) @?= rs
+
+test_root = testGroup "stack machine"
+  [ testCase "immediate halt" do
+      evalsTo [] [stkP|
+        (define $start
+          (return 0))
+      |]
+  , testCase "lit int" do
+      evalsTo [ObjImm (ImmInt 3)] [stkP|
+        (define $start
+          (push! 3)
+          (return 1))
+      |]
+  , testCase "non-tail identity function" do
+      evalsTo [ObjImm (ImmInt 123)] [stkP|
+        (define $id
+          (return 1))
+        (define $c
+          (return 1))
+        (define $start
+          (push! $c)
+          (push! $id)
+          (push! 123)
+          (call 1))
+      |]
+  , testCase "tail identity function" do
+      evalsTo [ObjImm (ImmInt 123)] [stkP|
+        (define $id
+          (return 1))
+        (define $start
+          (push! $id)
+          (push! 123)
+          (tail-call 1))
+      |]
+  , testCase "return constant" do
+      evalsTo [ObjImm (ImmInt 123)] [stkP|
+        (define $start
+          (push! $silly)
+          (tail-call 1))
+        (define $silly
+          (push! 123)
+          (return 1))
+      |]
+  , testCase "return multiple" do
+      evalsTo [ObjImm (ImmInt n) | n <- [1,2,3]] [stkP|
+        (define $start
+          (push! 3)
+          (push! 2)
+          (push! 1)
+          (return 3))
+      |]
+  , testCase "return none" do
+      evalsTo [] [stkP|
+        (define $start
+          (return 0))
+      |]
+  , testCase "square" do
+      evalsTo [ObjImm (ImmInt 16)] [stkP|
+        (define $start
+          (push! $square)
+          (push! 4)
+          (tail-call 1))
+        (define $square
+          (pop! %x)
+          (prim (* %x %x))
+          (return 1))
+      |]
+  , testGroup "factorial"
+      let
+        hsfac (n :: Int) = foldr @List (*) 1 [1..n]
+        fac (n :: Int) = [stkP|
+          (define $start
+            (push! $fac)
+            (push! #{n})
+            (tail-call 1))
+          (define $fac
+            (load %n 0)
+            (prim (zero? %n))
+            (pop! %x0)
+            (if %x0
+                (then (push! 1)
+                      (return 1))
+                (else (push! $fac-c0)
+                      (push! $fac)
+                      (prim (- %n 1))
+                      (call 1))))
+          (define $fac-c0
+            (pop! %x2)
+            (pop! %n)
+            (prim (* %n %x2))
+            (return 1))
+      |]
+        mkcase n = testCase [i|#{n}|] do
+          evalsTo [ObjImm . ImmInt $ hsfac n] $ fac n
+      -- 20 is the greatest `n` for which n! ≤ maxBount @Int
+      in [ mkcase n | n <- [0,1,6,20] ]
+  ]