ghc-mod/GHCApi.hs

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{-# LANGUAGE ScopedTypeVariables #-}
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module GHCApi (
withGHC
, withGHCDummyFile
, initializeFlags
, initializeFlagsWithCradle
, setTargetFile
, getDynamicFlags
, setSlowDynFlags
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, checkSlowAndSet
, canCheckFast
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) where
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import CabalApi
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import Control.Applicative
import Control.Exception
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import Control.Monad
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import CoreMonad
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import Data.Maybe (isJust)
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import DynFlags
import ErrMsg
import Exception
import GHC
import GHC.Paths (libdir)
import System.Exit
import System.IO
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import Types
----------------------------------------------------------------
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withGHCDummyFile :: Alternative m => Ghc (m a) -> IO (m a)
withGHCDummyFile = withGHC "Dummy"
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withGHC :: Alternative m => FilePath -> Ghc (m a) -> IO (m a)
withGHC file body = ghandle ignore $ runGhc (Just libdir) $ do
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dflags <- getSessionDynFlags
defaultCleanupHandler dflags body
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where
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ignore :: Alternative m => SomeException -> IO (m a)
ignore e = do
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hPutStr stderr $ file ++ ":0:0:Error:"
hPrint stderr e
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exitSuccess
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----------------------------------------------------------------
importDirs :: [IncludeDir]
importDirs = [".","..","../..","../../..","../../../..","../../../../.."]
data Build = CabalPkg | SingleFile deriving Eq
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initializeFlagsWithCradle :: Options -> Cradle -> [GHCOption] -> Bool -> Ghc LogReader
initializeFlagsWithCradle opt cradle ghcOptions logging
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| cabal = withCabal `gcatch` fallback
| otherwise = withoutCabal
where
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cabal = isJust $ cradleCabalFile cradle
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withCabal = do
(gopts,idirs,depPkgs) <- liftIO $ fromCabalFile ghcOptions cradle
initSession CabalPkg opt gopts idirs (Just depPkgs) logging
withoutCabal =
initSession SingleFile opt ghcOptions importDirs Nothing logging
fallback :: SomeException -> Ghc LogReader
fallback _ = withoutCabal
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----------------------------------------------------------------
initSession :: Build
-> Options
-> [GHCOption]
-> [IncludeDir]
-> Maybe [Package]
-> Bool
-> Ghc LogReader
initSession build opt cmdOpts idirs mDepPkgs logging = do
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dflags0 <- getSessionDynFlags
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(dflags1,readLog) <- setupDynamicFlags dflags0
_ <- setSessionDynFlags dflags1
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return readLog
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where
setupDynamicFlags df0 = do
df1 <- modifyFlagsWithOpts df0 cmdOpts
let df2 = modifyFlags df1 idirs mDepPkgs (expandSplice opt) build
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df3 <- modifyFlagsWithOpts df2 $ ghcOpts opt
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liftIO $ setLogger logging df3
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----------------------------------------------------------------
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initializeFlags :: Options -> Ghc ()
initializeFlags opt = do
dflags0 <- getSessionDynFlags
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dflags1 <- modifyFlagsWithOpts dflags0 $ ghcOpts opt
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void $ setSessionDynFlags dflags1
----------------------------------------------------------------
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-- FIXME removing Options
modifyFlags :: DynFlags -> [IncludeDir] -> Maybe [Package] -> Bool -> Build -> DynFlags
modifyFlags d0 idirs mDepPkgs splice build
| splice = setSplice d4
| otherwise = d4
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where
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d1 = d0 { importPaths = idirs }
d2 = setFastOrNot d1 Fast
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d3 = maybe d2 (addDevPkgs d2) mDepPkgs
d4 | build == CabalPkg = setCabalPkg d3
| otherwise = d3
setCabalPkg :: DynFlags -> DynFlags
setCabalPkg dflag = dopt_set dflag Opt_BuildingCabalPackage
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setSplice :: DynFlags -> DynFlags
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setSplice dflag = dopt_set dflag Opt_D_dump_splices
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addDevPkgs :: DynFlags -> [Package] -> DynFlags
addDevPkgs df pkgs = df''
where
df' = dopt_set df Opt_HideAllPackages
df'' = df' {
packageFlags = map ExposePackage pkgs ++ packageFlags df
}
----------------------------------------------------------------
setFastOrNot :: DynFlags -> CheckSpeed -> DynFlags
setFastOrNot dflags Slow = dflags {
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ghcLink = LinkInMemory
, hscTarget = HscInterpreted
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}
setFastOrNot dflags Fast = dflags {
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ghcLink = NoLink
, hscTarget = HscNothing
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}
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setSlowDynFlags :: Ghc ()
setSlowDynFlags = (flip setFastOrNot Slow <$> getSessionDynFlags)
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>>= void . setSessionDynFlags
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-- To check TH, a session module graph is necessary.
-- "load" sets a session module graph using "depanal".
-- But we have to set "-fno-code" to DynFlags before "load".
-- So, this is necessary redundancy.
checkSlowAndSet :: Ghc ()
checkSlowAndSet = do
fast <- canCheckFast <$> depanal [] False
unless fast setSlowDynFlags
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----------------------------------------------------------------
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modifyFlagsWithOpts :: DynFlags -> [String] -> Ghc DynFlags
modifyFlagsWithOpts dflags cmdOpts =
tfst <$> parseDynamicFlags dflags (map noLoc cmdOpts)
where
tfst (a,_,_) = a
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----------------------------------------------------------------
setTargetFile :: (GhcMonad m) => String -> m ()
setTargetFile file = do
target <- guessTarget file Nothing
setTargets [target]
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----------------------------------------------------------------
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getDynamicFlags :: IO DynFlags
getDynamicFlags = runGhc (Just libdir) getSessionDynFlags
canCheckFast :: ModuleGraph -> Bool
canCheckFast = not . any (hasTHorQQ . ms_hspp_opts)
where
hasTHorQQ :: DynFlags -> Bool
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hasTHorQQ dflags = any (`xopt` dflags) [Opt_TemplateHaskell, Opt_QuasiQuotes]