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{-# language GADTSyntax #-}
{-# language KindSignatures #-}
{-# language UnliftedFFITypes #-}
{-# language ForeignFunctionInterface #-}
{-# language MagicHash #-}
{-# language UnboxedTuples #-}
{-# language ExplicitForAll #-}
-- Test for shims when passing an array of lifted values
-- to a foreign function.
-- See test T16650a for more commentary.
import GHC.Exts
import GHC.Word
import GHC.IO
import Data.Kind (Type)
main :: IO ()
main = do
mbs <- newArray 2 ((+55) :: Int -> Int)
case box mbs of
Box x -> print =<< c_is_doubleton_homogeneous (unsafeCoerce# x)
foreign import ccall unsafe "is_doubleton_homogenous"
c_is_doubleton_homogeneous :: forall (a :: Type).
MutableArray# RealWorld a -> IO Word8
data Box :: Type where
Box :: (Any :: TYPE ('BoxedRep 'Unlifted)) -> Box
-- An array of unary integer functions
data MutableArray :: Type where
MutableArray :: MutableArray# RealWorld (Int -> Int) -> MutableArray
box :: MutableArray -> Box
{-# noinline box #-}
box (MutableArray x) = Box (unsafeCoerce# x)
-- Allocate a new array of unary integer functions.
newArray :: Int -> (Int -> Int) -> IO MutableArray
newArray (I# len#) x = IO $ \s0 -> case newArray# len# x s0 of
(# s1, a# #) -> (# s1, MutableArray a# #)
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