{-# LANGUAGE BangPatterns          #-}
{-# LANGUAGE ConstraintKinds       #-}
{-# LANGUAGE FlexibleContexts      #-}
{-# LANGUAGE FlexibleInstances     #-}
{-# LANGUAGE GADTs                 #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE ScopedTypeVariables   #-}
{-# LANGUAGE TemplateHaskell       #-}
{-# LANGUAGE TypeApplications      #-}
{-# LANGUAGE TypeFamilies          #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
-- |
-- Module      : Data.Array.Accelerate.LLVM.PTX.Execute.Marshal
-- Copyright   : [2014..2020] The Accelerate Team
-- License     : BSD3
--
-- Maintainer  : Trevor L. McDonell <trevor.mcdonell@gmail.com>
-- Stability   : experimental
-- Portability : non-portable (GHC extensions)
--

module Data.Array.Accelerate.LLVM.PTX.Execute.Marshal (

  module Data.Array.Accelerate.LLVM.Execute.Marshal

) where

import Data.Array.Accelerate.LLVM.State
import Data.Array.Accelerate.LLVM.Execute.Marshal

import Data.Array.Accelerate.LLVM.PTX.Target
import Data.Array.Accelerate.LLVM.PTX.Execute.Async
import qualified Data.Array.Accelerate.LLVM.PTX.Array.Prim      as Prim

import Data.Array.Accelerate.Type
import Data.Array.Accelerate.Array.Data

import qualified Foreign.CUDA.Driver                            as CUDA

import qualified Data.DList                                     as DL


instance Marshal PTX where
  type ArgR PTX = CUDA.FunParam

  marshalInt = CUDA.VArg
  marshalScalarData' t
    | SingleArrayDict <- singleArrayDict t
    = liftPar . fmap (DL.singleton . CUDA.VArg) . unsafeGetDevicePtr t

-- TODO FIXME !!!
--
-- We will probably need to change marshal to be a bracketed function, so that
-- the garbage collector does not try to evict the array in the middle of
-- a computation.
--
unsafeGetDevicePtr
    :: SingleType e
    -> ArrayData e
    -> LLVM PTX (CUDA.DevicePtr (ScalarArrayDataR e))
unsafeGetDevicePtr !t !ad =
  Prim.withDevicePtr t ad (\p -> return (Nothing, p))