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-- MIT License, Copyright (c) 2024 Marvin Borner
-- Ultimately, the optimizer should not be outsourced but handled directly in Haskell.
-- For now, my BLoC format is used in combination with BLoCade the BLoC-aid.
module Optimizer
( optimizeToTarget
, optimizedReduce
) where
import Binary
import Control.Exception
import qualified Data.BitString as Bit
import qualified Data.ByteString.Lazy.Char8 as Byte
import Helper
import Reducer
import System.IO
import System.Process
tryIO :: IO a -> IO (Either IOException a)
tryIO = try
toBloc :: Expression -> IO (Failable Handle)
toBloc e = do
let binary = toBinary e
tryBloc <- tryIO $ createProcess (proc "bloc" ["-i", "-", "--from-blc"])
{ std_in = CreatePipe
, std_out = CreatePipe
}
let bloc = case tryBloc of
Right (Just i, Just o, _, _) -> Just (i, o)
_ -> Nothing
case bloc of
Just (inH, outH) -> do
hPutStrLn inH binary
return $ Right outH
Nothing -> return $ Left $ OptimizerError "can't read/write to bloc"
toTarget :: Expression -> String -> IO (Failable String)
toTarget e target = do
maybeBloc <- toBloc e
case maybeBloc of
Left err -> return $ Left err
Right bloc -> do
res <- tryIO $ createProcess (proc "blocade" ["-i", "-", "-t", target])
{ std_in = UseHandle bloc
, std_out = CreatePipe
}
let out = case res of
Left _ -> Nothing
Right (_, o, _, _) -> o
case out of
Just h -> do
hSetBinaryMode h True
content <- hGetContents h
return $ case content of
"" -> Left $ OptimizerError "blocade returned empty string"
_ -> Right content
Nothing -> return $ Left $ OptimizerError "can't read from blocade"
-- TODO: add more targets (including other PL compilation)
toExpression :: String -> String -> Expression
toExpression "blc" = fromBinary
toExpression "unblc" = fromBinary
toExpression "bblc" =
fromBinary . fromBitString . Bit.bitStringLazy . Byte.pack
toExpression "unbblc" =
fromBinary . fromBitString . Bit.bitStringLazy . Byte.pack
toExpression _ = invalidProgramState
optimizeToTarget :: EvalConf -> Expression -> IO Expression
optimizeToTarget conf e = do
let target = _optimizeTarget conf
case target of
"" -> return e -- No target, fallback to unoptimized expression
_ -> do
maybeRes <- toTarget e target
case maybeRes of
Left err -> do
print err
return e -- Fallback to unoptimized expression
Right res -> return $ toExpression target res
optimizedReduce :: EvalConf -> Expression -> IO Expression
optimizedReduce conf e = optimizeToTarget conf e >>= reduce
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