{-# LANGUAGE OverloadedStrings #-}

module Rattus.Plugin.Strictify where
import Prelude hiding ((<>))
import Rattus.Plugin.Utils
import GhcPlugins


data SCxt = SCxt {SCxt -> SrcSpan
srcSpan :: SrcSpan, SCxt -> Bool
checkStrictData :: Bool}


strictifyExpr :: SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr :: SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr ss :: SCxt
ss (Let (NonRec b :: CoreBndr
b e1 :: CoreExpr
e1) e2 :: CoreExpr
e2) = do
  CoreExpr
e1' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e1
  CoreExpr
e2' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e2
  CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> CoreBndr -> Type -> [Alt CoreBndr] -> CoreExpr
forall b. Expr b -> b -> Type -> [Alt b] -> Expr b
Case CoreExpr
e1' CoreBndr
b (CoreExpr -> Type
exprType CoreExpr
e2) [(AltCon
DEFAULT, [], CoreExpr
e2')])
strictifyExpr ss :: SCxt
ss (Case e :: CoreExpr
e b :: CoreBndr
b t :: Type
t alts :: [Alt CoreBndr]
alts) = do
  CoreExpr
e' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e
  [Alt CoreBndr]
alts' <- (Alt CoreBndr -> CoreM (Alt CoreBndr))
-> [Alt CoreBndr] -> CoreM [Alt CoreBndr]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (\(c :: AltCon
c,args :: [CoreBndr]
args,e :: CoreExpr
e) -> (CoreExpr -> Alt CoreBndr)
-> CoreM CoreExpr -> CoreM (Alt CoreBndr)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\e' :: CoreExpr
e' -> (AltCon
c,[CoreBndr]
args,CoreExpr
e')) (SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e)) [Alt CoreBndr]
alts
  CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> CoreBndr -> Type -> [Alt CoreBndr] -> CoreExpr
forall b. Expr b -> b -> Type -> [Alt b] -> Expr b
Case CoreExpr
e' CoreBndr
b Type
t [Alt CoreBndr]
alts')
strictifyExpr ss :: SCxt
ss (Let (Rec es :: [(CoreBndr, CoreExpr)]
es) e :: CoreExpr
e) = do
  [(CoreBndr, CoreExpr)]
es' <- ((CoreBndr, CoreExpr) -> CoreM (CoreBndr, CoreExpr))
-> [(CoreBndr, CoreExpr)] -> CoreM [(CoreBndr, CoreExpr)]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
mapM (\ (b :: CoreBndr
b,e :: CoreExpr
e) -> SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e CoreM CoreExpr
-> (CoreExpr -> CoreM (CoreBndr, CoreExpr))
-> CoreM (CoreBndr, CoreExpr)
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \e' :: CoreExpr
e'-> (CoreBndr, CoreExpr) -> CoreM (CoreBndr, CoreExpr)
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreBndr
b,CoreExpr
e')) [(CoreBndr, CoreExpr)]
es
  CoreExpr
e' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e
  CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (Bind CoreBndr -> CoreExpr -> CoreExpr
forall b. Bind b -> Expr b -> Expr b
Let ([(CoreBndr, CoreExpr)] -> Bind CoreBndr
forall b. [(b, Expr b)] -> Bind b
Rec [(CoreBndr, CoreExpr)]
es') CoreExpr
e')
strictifyExpr ss :: SCxt
ss (Lam b :: CoreBndr
b e :: CoreExpr
e)
   | Bool -> Bool
not (CoreBndr -> Bool
isCoVar CoreBndr
b) Bool -> Bool -> Bool
&& Bool -> Bool
not (CoreBndr -> Bool
isTyVar CoreBndr
b) Bool -> Bool -> Bool
&& Type -> Bool
tcIsLiftedTypeKind(HasDebugCallStack => Type -> Type
Type -> Type
typeKind (CoreBndr -> Type
varType CoreBndr
b))
    = do
       CoreExpr
e' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e
       CoreBndr
b' <- FastString -> Type -> CoreM CoreBndr
forall (m :: * -> *).
MonadUnique m =>
FastString -> Type -> m CoreBndr
mkSysLocalM (String -> FastString
fsLit "strict") (CoreBndr -> Type
varType CoreBndr
b)
       CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreBndr -> CoreExpr -> CoreExpr
forall b. b -> Expr b -> Expr b
Lam CoreBndr
b' (CoreExpr -> CoreBndr -> Type -> [Alt CoreBndr] -> CoreExpr
forall b. Expr b -> b -> Type -> [Alt b] -> Expr b
Case (CoreBndr -> CoreExpr
forall b. CoreBndr -> Expr b
varToCoreExpr CoreBndr
b') CoreBndr
b (CoreExpr -> Type
exprType CoreExpr
e) [(AltCon
DEFAULT,[],CoreExpr
e')]))
   | Bool
otherwise = do
       CoreExpr
e' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e
       CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreBndr -> CoreExpr -> CoreExpr
forall b. b -> Expr b -> Expr b
Lam CoreBndr
b CoreExpr
e')
strictifyExpr ss :: SCxt
ss (Cast e :: CoreExpr
e c :: Coercion
c) = do
  CoreExpr
e' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e
  CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> Coercion -> CoreExpr
forall b. Expr b -> Coercion -> Expr b
Cast CoreExpr
e' Coercion
c)
strictifyExpr ss :: SCxt
ss (Tick t :: Tickish CoreBndr
t@(SourceNote span :: RealSrcSpan
span _) e :: CoreExpr
e) = do
  CoreExpr
e' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr (SCxt
ss{srcSpan :: SrcSpan
srcSpan = RealSrcSpan -> SrcSpan
RealSrcSpan RealSrcSpan
span}) CoreExpr
e
  CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (Tickish CoreBndr -> CoreExpr -> CoreExpr
forall b. Tickish CoreBndr -> Expr b -> Expr b
Tick Tickish CoreBndr
t CoreExpr
e')
strictifyExpr ss :: SCxt
ss (App e1 :: CoreExpr
e1 e2 :: CoreExpr
e2)
  | (SCxt -> Bool
checkStrictData SCxt
ss Bool -> Bool -> Bool
&& Bool -> Bool
not (CoreExpr -> Bool
forall b. Expr b -> Bool
isType CoreExpr
e2) Bool -> Bool -> Bool
&& Type -> Bool
tcIsLiftedTypeKind(HasDebugCallStack => Type -> Type
Type -> Type
typeKind (CoreExpr -> Type
exprType CoreExpr
e2))
        Bool -> Bool -> Bool
&& Bool -> Bool
not (Type -> Bool
isStrict (CoreExpr -> Type
exprType CoreExpr
e2))) = do
      (Severity -> SrcSpan -> SDoc -> CoreM ()
printMessage Severity
SevWarning (SCxt -> SrcSpan
srcSpan SCxt
ss)
         (String -> SDoc
text "The use of lazy type " SDoc -> SDoc -> SDoc
<> Type -> SDoc
forall a. Outputable a => a -> SDoc
ppr (CoreExpr -> Type
exprType CoreExpr
e2) SDoc -> SDoc -> SDoc
<> " may lead to memory leaks"))
      CoreExpr
e1' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss{checkStrictData :: Bool
checkStrictData = Bool
False} CoreExpr
e1
      CoreExpr
e2' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss{checkStrictData :: Bool
checkStrictData = Bool
False} CoreExpr
e2
      CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> CoreExpr -> CoreExpr
forall b. Expr b -> Expr b -> Expr b
App CoreExpr
e1' CoreExpr
e2')
  | Bool
otherwise = do
      CoreExpr
e1' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e1
      CoreExpr
e2' <- SCxt -> CoreExpr -> CoreM CoreExpr
strictifyExpr SCxt
ss CoreExpr
e2
      CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return (CoreExpr -> CoreExpr -> CoreExpr
forall b. Expr b -> Expr b -> Expr b
App CoreExpr
e1' CoreExpr
e2')
strictifyExpr _ss :: SCxt
_ss e :: CoreExpr
e = CoreExpr -> CoreM CoreExpr
forall (m :: * -> *) a. Monad m => a -> m a
return CoreExpr
e


isDelayApp :: Expr b -> Bool
isDelayApp (App e :: Expr b
e _) = Expr b -> Bool
isDelayApp Expr b
e
isDelayApp (Cast e :: Expr b
e _) = Expr b -> Bool
isDelayApp Expr b
e
isDelayApp (Tick _ e :: Expr b
e) = Expr b -> Bool
isDelayApp Expr b
e
isDelayApp (Var v :: CoreBndr
v) = CoreBndr -> Bool
isDelayVar CoreBndr
v
isDelayApp _ = Bool
False




isDelayVar :: Var -> Bool
isDelayVar :: CoreBndr -> Bool
isDelayVar v :: CoreBndr
v = Bool -> (Bool -> Bool) -> Maybe Bool -> Bool
forall b a. b -> (a -> b) -> Maybe a -> b
maybe Bool
False Bool -> Bool
forall a. a -> a
id (Maybe Bool -> Bool) -> Maybe Bool -> Bool
forall a b. (a -> b) -> a -> b
$ do
  let name :: Name
name = CoreBndr -> Name
varName CoreBndr
v
  Module
mod <- Name -> Maybe Module
nameModule_maybe Name
name
  let occ :: String
occ = Name -> String
forall a. NamedThing a => a -> String
getOccString Name
name
  Bool -> Maybe Bool
forall (m :: * -> *) a. Monad m => a -> m a
return ((String
occ String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "Delay" Bool -> Bool -> Bool
|| String
occ String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "delay") Bool -> Bool -> Bool
|| (String
occ String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "Box" Bool -> Bool -> Bool
|| String
occ String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "delay")
          Bool -> Bool -> Bool
&& ((ModuleName -> String
moduleNameString (Module -> ModuleName
moduleName Module
mod) String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "Rattus.Internal") Bool -> Bool -> Bool
||
          ModuleName -> String
moduleNameString (Module -> ModuleName
moduleName Module
mod) String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "Rattus.Primitives"))

isCase :: Expr b -> Bool
isCase Case{} = Bool
True
isCase (Tick _ e :: Expr b
e) = Expr b -> Bool
isCase Expr b
e
isCase (Cast e :: Expr b
e _) = Expr b -> Bool
isCase Expr b
e
isCase Lam {} = Bool
True
isCase e :: Expr b
e = Expr b -> Bool
forall b. Expr b -> Bool
isType Expr b
e

isTophandler :: Expr b -> Bool
isTophandler (App e1 :: Expr b
e1 e2 :: Expr b
e2) = Expr b -> Bool
isTophandler Expr b
e1 Bool -> Bool -> Bool
|| Expr b -> Bool
isTophandler Expr b
e2
isTophandler (Cast e :: Expr b
e _) = Expr b -> Bool
isTophandler Expr b
e
isTophandler (Tick _ e :: Expr b
e) = Expr b -> Bool
isTophandler Expr b
e
isTophandler e :: Expr b
e = SDoc -> String
showSDocUnsafe (Expr b -> SDoc
forall a. Outputable a => a -> SDoc
ppr Expr b
e) String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== "GHC.TopHandler.runMainIO"