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{-# LANGUAGE DeriveDataTypeable, RankNTypes #-}
module Main where
--------------------------------------------------------------------------------
-- Imports
--------------------------------------------------------------------------------
-- from base:
import Prelude hiding (catch)
import Control.Exception ( Exception, SomeException, throwIO )
import qualified Control.Exception as E ( mask, bracket, bracket_ )
import Data.Typeable
import Control.Monad (join)
-- from criterion:
import Criterion.Main
-- from transformers:
import Control.Monad.IO.Class
import Control.Monad.Trans.Maybe
import Control.Monad.Trans.Reader
import Control.Monad.Trans.State
import Control.Monad.Trans.Writer
-- from monad-peel:
import qualified Control.Exception.Peel as MP
import qualified Control.Monad.IO.Peel as MP
-- from monad-control:
import qualified Control.Monad.Trans.Control as MC
-- from lifted-base:
import qualified Control.Exception.Lifted as MC
--------------------------------------------------------------------------------
-- Main
--------------------------------------------------------------------------------
main :: IO ()
main = defaultMain
[ b "bracket" benchBracket MP.bracket MC.bracket
, b "bracket_" benchBracket_ MP.bracket_ MC.bracket_
, b "catch" benchCatch MP.catch MC.catch
, b "try" benchTry MP.try MC.try
, bgroup "mask"
[ bench "monad-peel" $ whnfIO $ benchMask mpMask
, bench "monad-control" $ whnfIO $ benchMask MC.mask
]
, bgroup "liftIOOp"
[ bench "monad-peel" $ whnfIO $ exe $ MP.liftIOOp (E.bracket nop (\_ -> nop))
(\_ -> nop)
, bench "monad-control" $ whnfIO $ exe $ MC.liftBaseOp (E.bracket nop (\_ -> nop))
(\_ -> nop)
]
, bgroup "liftIOOp_"
[ bench "monad-peel" $ whnfIO $ exe $ MP.liftIOOp_ (E.bracket_ nop nop) nop
, bench "monad-control" $ whnfIO $ exe $ MC.liftBaseOp_ (E.bracket_ nop nop) nop
]
]
b name bnch peel mndCtrl = bgroup name
[ bench "monad-peel" $ whnfIO $ bnch peel
, bench "monad-control" $ whnfIO $ bnch mndCtrl
]
--------------------------------------------------------------------------------
-- Monad stack
--------------------------------------------------------------------------------
type M a = ReaderT Int (StateT Bool (WriterT String (MaybeT IO))) a
type R a = IO (Maybe ((a, Bool), String))
runM :: Int -> Bool -> M a -> R a
runM r s m = runMaybeT (runWriterT (runStateT (runReaderT m r) s))
exe :: M a -> R a
exe = runM 0 False
--------------------------------------------------------------------------------
-- Benchmarks
--------------------------------------------------------------------------------
benchBracket bracket = exe $ bracket nop (\_ -> nop) (\_ -> nop)
benchBracket_ bracket_ = exe $ bracket_ nop nop nop
benchCatch catch = exe $ catch throwE (\E -> nop)
benchTry try = exe $ try throwE :: R (Either E ())
benchMask :: (((forall a. M a -> M a) -> M ()) -> M ()) -> R ()
benchMask mask = exe $ mask $ \restore -> nop >> restore nop >> nop
--------------------------------------------------------------------------------
-- Utils
--------------------------------------------------------------------------------
nop :: Monad m => m ()
nop = return ()
data E = E deriving (Show, Typeable)
instance Exception E
throwE :: MonadIO m => m ()
throwE = liftIO $ throwIO E
mpMask :: MP.MonadPeelIO m => ((forall a. m a -> m a) -> m b) -> m b
mpMask f = do
k <- MP.peelIO
join $ liftIO $ E.mask $ \restore -> k $ f $ MP.liftIOOp_ restore