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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE StandaloneKindSignatures #-}
{-# LANGUAGE DeriveFunctor #-}
module Compile where
import Control.Monad (ap)
import Data.Kind (Type)
import Data.Map.Strict (Map)
import qualified Data.Map.Strict as Map
import AST
data Body = Body [Stm] Inline -- body, return expr
deriving (Show)
data Stm
= VarDef String String (Maybe Inline) -- type, name, initialiser
| Launch Inline Inline Body -- num blocks, block size, kernel function body
deriving (Show)
-- inline cuda expression
data Inline
= IOp Inline String Inline
| IUOp String Inline
| ILit String
| IVar String
| ICall Inline [Inline]
deriving (Show)
data Target = Host | Device
deriving (Show)
data FunDef = FunDef Target String [String] Body -- name, params (full declarations), body
deriving (Show)
type Env :: [Ty] -> Type -> Type
data Env env v where
ETop :: Env '[] v
EPush :: v -> Env env v -> Env (t : env) v
prj :: Env env v -> Idx env t -> v
prj = \env idx -> go idx env
where go :: Idx env t -> Env env v -> v
go IZ (EPush v _) = v
go (IS i) (EPush _ env) = go i env
-- generated global function definitions, generated local statements, function typedef cache (name, decl)
newtype M a = M (Int -> Map Ty (String, String) -> ([FunDef], [Stm], Map Ty (String, String), Int, a))
deriving (Functor)
instance Applicative M where
pure x = M (\i m -> ([], [], m, i, x))
(<*>) = ap
instance Monad M where
M f >>= g = M (\i m -> let (d1, s1, m1, i1, x) = f i m
(d2, s2, m2, i2, y) = let M h = g x in h i1 m1
in (d1 <> d2, s1 <> s2, m2, i2, y))
emitFun :: FunDef -> M ()
emitFun fd = M (\i m -> ([fd], [], m, i, ()))
emitStm :: Stm -> M ()
emitStm stm = M (\i m -> ([], [stm], m, i, ()))
captureStms :: M a -> M ([Stm], a)
captureStms (M f) = M (\i m -> let (d, s, m2, i2, x) = f i m
in (d, [], m2, i2, (s, x)))
genId :: M Int
genId = M (\i m -> ([], [], m, i + 1, i))
getTypedef :: Ty -> M (Maybe String)
getTypedef t = M $ \i m -> ([], [], m, i, fst <$> Map.lookup t m)
putTypedef :: Ty -> String -> String -> M ()
putTypedef t name decl = M $ \i m -> ([], [], Map.insert t (name, decl) m, i, ())
genName :: String -> M String
genName s = (\i -> s ++ sep ++ show i ++ suf) <$> genId
where (sep, suf) = case reverse s of
[] -> ("x", "_")
c : _ | c `elem` "0123456789_" -> ("_", "")
| otherwise -> ("", "")
-- Function values are returned as a function-pointer-typed expression
compile :: Target -> Env env String -> Expr x env t -> M Inline
compile tgt env = \case
EVar _ _ i -> pure $ IVar (prj env i)
ELet _ rhs e -> do
rhsi <- compile tgt env rhs
var <- genName "x"
rhsty <- writeType (typeOf rhs)
emitStm $ VarDef rhsty var (Just rhsi)
compile tgt (EPush var env) e
EBuild1 x k e -> compile tgt env $ EBuild x (SS SZ) (k :< VNil) e
EBuild x n k e -> case tgt of
Host -> do
fname <- genName "buildfun"
let n' = fromNat (unSNat n)
shapevars = ['s' : show i | i <- [0 .. n' - 1]]
emitFun $ FunDef Device fname (map ("int " ++) shapevars) _
emitStm $ Launch _ _ _
_
Device -> _
writeType :: STy t -> M String
writeType = \case
STArr _ t -> (++ "*") <$> writeType t
STNil -> pure "Nil"
STPair a b -> (\x y -> "std::pair<" ++ x ++ "," ++ y ++ ">") <$> writeType a <*> writeType b
STScal t -> case t of
STI32 -> pure "int32_t"
STI64 -> pure "int64_t"
STF32 -> pure "float"
STF64 -> pure "double"
STBool -> pure "bool"
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