ghc-mod/Language/Haskell/GhcMod/DynFlags.hs

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{-# LANGUAGE CPP #-}
module Language.Haskell.GhcMod.DynFlags where
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import Control.Applicative
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import Control.Monad
import GHC
import qualified GHC as G
import GHC.Paths (libdir)
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import qualified Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.DebugLogger
import System.IO.Unsafe (unsafePerformIO)
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import Prelude
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setDebugLogger :: (String -> IO ()) -> DynFlags -> DynFlags
setDebugLogger put df = do
Gap.setLogAction df (debugLogAction put)
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-- * Fast
-- * Friendly to foreign export
-- * Not friendly to -XTemplateHaskell and -XPatternSynonyms
-- * Uses little memory
setModeSimple :: DynFlags -> DynFlags
setModeSimple df = df {
ghcMode = CompManager
, ghcLink = NoLink
, hscTarget = HscNothing
, optLevel = 0
}
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-- * Slow
-- * Not friendly to foreign export
-- * Friendly to -XTemplateHaskell and -XPatternSynonyms
-- * Uses lots of memory
setModeIntelligent :: DynFlags -> DynFlags
setModeIntelligent df = df {
ghcMode = CompManager
, ghcLink = LinkInMemory
, hscTarget = HscInterpreted
, optLevel = 0
}
-- | Parse command line ghc options and add them to the 'DynFlags' passed
addCmdOpts :: GhcMonad m => [GHCOption] -> DynFlags -> m DynFlags
addCmdOpts cmdOpts df =
fst3 <$> G.parseDynamicFlags df (map G.noLoc cmdOpts)
where
fst3 (a,_,_) = a
----------------------------------------------------------------
withDynFlags :: GhcMonad m
=> (DynFlags -> DynFlags)
-> m a
-> m a
withDynFlags setFlags body = G.gbracket setup teardown (\_ -> body)
where
setup = do
dflags <- G.getSessionDynFlags
void $ G.setSessionDynFlags (setFlags dflags)
return dflags
teardown = void . G.setSessionDynFlags
withCmdFlags :: GhcMonad m => [GHCOption] -> m a -> m a
withCmdFlags flags body = G.gbracket setup teardown (\_ -> body)
where
setup = do
dflags <- G.getSessionDynFlags
void $ G.setSessionDynFlags =<< addCmdOpts flags dflags
return dflags
teardown = void . G.setSessionDynFlags
----------------------------------------------------------------
-- | Set 'DynFlags' equivalent to "-w:".
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setNoWarningFlags :: DynFlags -> DynFlags
setNoWarningFlags df = df { warningFlags = Gap.emptyWarnFlags}
-- | Set 'DynFlags' equivalent to "-Wall".
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setAllWarningFlags :: DynFlags -> DynFlags
setAllWarningFlags df = df { warningFlags = allWarningFlags }
allWarningFlags :: Gap.WarnFlags
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allWarningFlags = unsafePerformIO $
G.runGhc (Just libdir) $ do
df <- G.getSessionDynFlags
df' <- addCmdOpts ["-Wall"] df
return $ G.warningFlags df'
----------------------------------------------------------------
-- | Set 'DynFlags' equivalent to "-fno-max-relevant-bindings".
setNoMaxRelevantBindings :: DynFlags -> DynFlags
#if __GLASGOW_HASKELL__ >= 708
setNoMaxRelevantBindings df = df { maxRelevantBinds = Nothing }
#else
setNoMaxRelevantBindings = id
#endif
deferErrors :: DynFlags -> Ghc DynFlags
deferErrors df = return $
Gap.setWarnTypedHoles $ Gap.setDeferTypedHoles $
Gap.setDeferTypeErrors $ setNoWarningFlags df