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|
-----------------------------------------------------------------------------
-- A Parser monad with access to the 'DynFlags'.
--
-- The 'P' monad only has access to the subset of 'DynFlags'
-- required for parsing Haskell.
-- The parser for C-- requires access to a lot more of the 'DynFlags',
-- so 'PD' provides access to 'DynFlags' via a 'HasDynFlags' instance.
-----------------------------------------------------------------------------
module GHC.Cmm.Monad (
PD(..)
, liftP
, failMsgPD
, getProfile
, getPlatform
, getPtrOpts
) where
import GHC.Prelude
import GHC.Platform
import GHC.Platform.Profile
import GHC.Cmm.Info
import Control.Monad
import GHC.Driver.Session
import GHC.Parser.Lexer
import GHC.Parser.Errors
import GHC.Types.SrcLoc
newtype PD a = PD { unPD :: DynFlags -> PState -> ParseResult a }
instance Functor PD where
fmap = liftM
instance Applicative PD where
pure = returnPD
(<*>) = ap
instance Monad PD where
(>>=) = thenPD
liftP :: P a -> PD a
liftP (P f) = PD $ \_ s -> f s
failMsgPD :: (SrcSpan -> Error) -> PD a
failMsgPD = liftP . failMsgP
returnPD :: a -> PD a
returnPD = liftP . return
thenPD :: PD a -> (a -> PD b) -> PD b
(PD m) `thenPD` k = PD $ \d s ->
case m d s of
POk s1 a -> unPD (k a) d s1
PFailed s1 -> PFailed s1
instance HasDynFlags PD where
getDynFlags = PD $ \d s -> POk s d
getProfile :: PD Profile
getProfile = targetProfile <$> getDynFlags
getPlatform :: PD Platform
getPlatform = profilePlatform <$> getProfile
getPtrOpts :: PD PtrOpts
getPtrOpts = do
dflags <- getDynFlags
profile <- getProfile
pure $ PtrOpts
{ po_profile = profile
, po_align_check = gopt Opt_AlignmentSanitisation dflags
}
|
