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

487 lines
17 KiB
Haskell

-- ghc-mod: Making Haskell development *more* fun
-- Copyright (C) 2015 Daniel Gröber <dxld ÄT darkboxed DOT org>
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
{-# LANGUAGE CPP, ViewPatterns, NamedFieldPuns, RankNTypes #-}
module Language.Haskell.GhcMod.Target where
import Control.Arrow
import Control.Applicative
import Control.Category ((.))
import Control.Monad.Reader (runReaderT)
import GHC
import GHC.Paths (libdir)
import StaticFlags
import SysTools
import DynFlags
import HscMain
import HscTypes
import Language.Haskell.GhcMod.DynFlags
import Language.Haskell.GhcMod.Monad.Types
import Language.Haskell.GhcMod.CabalHelper
import Language.Haskell.GhcMod.HomeModuleGraph
import Language.Haskell.GhcMod.PathsAndFiles
import Language.Haskell.GhcMod.GhcPkg
import Language.Haskell.GhcMod.Error
import Language.Haskell.GhcMod.Logging
import Language.Haskell.GhcMod.Types
import Language.Haskell.GhcMod.Utils as U
import Data.Maybe
import Data.Monoid as Monoid
import Data.Either
import Data.Foldable as Foldable (foldrM)
import qualified Data.Foldable as Foldable
import Data.Traversable hiding (mapM, forM)
import Data.IORef
import Data.List
import Data.Map (Map)
import qualified Data.Map as Map
import Data.Set (Set)
import qualified Data.Set as Set
import Distribution.Helper
import Prelude hiding ((.))
import System.Directory
import System.FilePath
withLightHscEnv :: forall m a. IOish m
=> [GHCOption] -> (HscEnv -> m a) -> m a
withLightHscEnv opts action = gbracket initEnv teardownEnv action
where
teardownEnv :: HscEnv -> m ()
teardownEnv env = liftIO $ do
let dflags = hsc_dflags env
cleanTempFiles dflags
cleanTempDirs dflags
initEnv :: m HscEnv
initEnv = liftIO $ do
initStaticOpts
settings <- initSysTools (Just libdir)
dflags <- initDynFlags (defaultDynFlags settings)
env <- newHscEnv dflags
dflags' <- runLightGhc env $ do
-- HomeModuleGraph and probably all other clients get into all sorts of
-- trouble if the package state isn't initialized here
_ <- setSessionDynFlags =<< addCmdOpts opts =<< getSessionDynFlags
getSessionDynFlags
newHscEnv dflags'
runLightGhc :: HscEnv -> LightGhc a -> IO a
runLightGhc env action = do
renv <- newIORef env
flip runReaderT renv $ unLightGhc action
runGmPkgGhc :: (IOish m, GmEnv m, GmState m, GmLog m) => LightGhc a -> m a
runGmPkgGhc action = do
pkgOpts <- packageGhcOptions
withLightHscEnv pkgOpts $ \env -> liftIO $ runLightGhc env action
initSession :: IOish m
=> [GHCOption] -> (DynFlags -> Ghc DynFlags) -> GhcModT m ()
initSession opts mdf = do
s <- gmsGet
case gmGhcSession s of
Just GmGhcSession {..} -> when (gmgsOptions /= opts) $ putNewSession s
Nothing -> putNewSession s
where
putNewSession s = do
rghc <- (liftIO . newIORef =<< newSession =<< cradle)
gmsPut s { gmGhcSession = Just $ GmGhcSession opts rghc }
newSession Cradle { cradleTempDir } = liftIO $ do
runGhc (Just libdir) $ do
let setDf df = setTmpDir cradleTempDir <$> (mdf =<< addCmdOpts opts df)
_ <- setSessionDynFlags =<< setDf =<< getSessionDynFlags
getSession
-- | Drop the currently active GHC session, the next that requires a GHC session
-- will initialize a new one.
dropSession :: IOish m => GhcModT m ()
dropSession = do
s <- gmsGet
case gmGhcSession s of
Just (GmGhcSession _opts ref) -> do
-- TODO: This is still not enough, there seem to still be references to
-- GHC's state around afterwards.
liftIO $ writeIORef ref (error "HscEnv: session was dropped")
-- Not available on ghc<7.8; didn't really help anyways
-- liftIO $ setUnsafeGlobalDynFlags (error "DynFlags: session was dropped")
gmsPut s { gmGhcSession = Nothing }
Nothing -> return ()
runGmlT :: IOish m => [Either FilePath ModuleName] -> GmlT m a -> GhcModT m a
runGmlT fns action = runGmlT' fns return action
runGmlT' :: IOish m
=> [Either FilePath ModuleName]
-> (DynFlags -> Ghc DynFlags)
-> GmlT m a
-> GhcModT m a
runGmlT' fns mdf action = runGmlTWith fns mdf id action
runGmlTWith :: IOish m
=> [Either FilePath ModuleName]
-> (DynFlags -> Ghc DynFlags)
-> (GmlT m a -> GmlT m b)
-> GmlT m a
-> GhcModT m b
runGmlTWith efnmns' mdf wrapper action = do
crdl <- cradle
Options { ghcUserOptions } <- options
let (fns, mns) = partitionEithers efnmns'
ccfns = map (cradleCurrentDir crdl </>) fns
cfns <- liftIO $ mapM canonicalizePath ccfns
let serfnmn = Set.fromList $ map Right mns ++ map Left cfns
opts <- targetGhcOptions crdl serfnmn
let opts' = opts ++ ["-O0"] ++ ghcUserOptions
gmVomit
"session-ghc-options"
(text "Initializing GHC session with following options")
(intercalate " " $ map (("\""++) . (++"\"")) opts')
initSession opts' $
setModeSimple >>> setEmptyLogger >>> mdf
let rfns = map (makeRelative $ cradleRootDir crdl) cfns
unGmlT $ wrapper $ do
loadTargets (map moduleNameString mns ++ rfns)
action
targetGhcOptions :: forall m. IOish m
=> Cradle
-> Set (Either FilePath ModuleName)
-> GhcModT m [GHCOption]
targetGhcOptions crdl sefnmn = do
when (Set.null sefnmn) $ error "targetGhcOptions: no targets given"
case cradleProjectType crdl of
CabalProject -> cabalOpts crdl
_ -> sandboxOpts crdl
where
zipMap f l = l `zip` (f `map` l)
cabalOpts :: Cradle -> GhcModT m [String]
cabalOpts Cradle{..} = do
mcs <- cabalResolvedComponents
let mdlcs = moduleComponents mcs `zipMap` Set.toList sefnmn
candidates = findCandidates $ map snd mdlcs
let noCandidates = Set.null candidates
noModuleHasAnyAssignment = all (Set.null . snd) mdlcs
if noCandidates && noModuleHasAnyAssignment
then do
-- First component should be ChLibName, if no lib will take lexically first exe.
let cns = filter (/= ChSetupHsName) $ Map.keys mcs
gmLog GmWarning "" $ strDoc $ "Could not find a component assignment, falling back to picking library component in cabal file."
return $ gmcGhcOpts $ fromJust $ Map.lookup (head cns) mcs
else do
when noCandidates $
throwError $ GMECabalCompAssignment mdlcs
let cn = pickComponent candidates
return $ gmcGhcOpts $ fromJust $ Map.lookup cn mcs
resolvedComponentsCache :: IOish m => Cached (GhcModT m) GhcModState
[GmComponent 'GMCRaw (Set.Set ModulePath)]
(Map.Map ChComponentName (GmComponent 'GMCResolved (Set.Set ModulePath)))
resolvedComponentsCache = Cached {
cacheLens = Just (lGmcResolvedComponents . lGmCaches),
cacheFile = resolvedComponentsCacheFile,
cachedAction = \tcfs comps ma -> do
Cradle {..} <- cradle
let iifsM = invalidatingInputFiles tcfs
mums :: Maybe [Either FilePath ModuleName]
mums =
case iifsM of
Nothing -> Nothing
Just iifs ->
let
filterOutSetupCfg =
filter (/= cradleRootDir </> setupConfigPath)
changedFiles = filterOutSetupCfg iifs
in if null changedFiles
then Nothing
else Just $ map Left changedFiles
setupChanged = maybe False
(elem $ cradleRootDir </> setupConfigPath)
iifsM
case (setupChanged, ma) of
(False, Just mcs) -> gmsGet >>= \s -> gmsPut s { gmComponents = mcs }
_ -> return ()
let mdesc (Left f) = "file:" ++ f
mdesc (Right mn) = "module:" ++ moduleNameString mn
changed = map (text . mdesc) $ Foldable.concat mums
changedDoc | [] <- changed = text "none"
| otherwise = sep changed
gmLog GmDebug "resolvedComponentsCache" $
text "files changed" <+>: changedDoc
mcs <- resolveGmComponents mums comps
return (setupConfigPath:flatten mcs , mcs)
}
where
flatten :: Map.Map ChComponentName (GmComponent t (Set.Set ModulePath))
-> [FilePath]
flatten = Map.elems
>>> map (gmcHomeModuleGraph >>> gmgGraph
>>> Map.elems
>>> map (Set.map mpPath)
>>> Set.unions
)
>>> Set.unions
>>> Set.toList
moduleComponents :: Map ChComponentName (GmComponent t (Set ModulePath))
-> Either FilePath ModuleName
-> Set ChComponentName
moduleComponents m efnmn =
foldr' Set.empty m $ \c s ->
let
memb =
case efnmn of
Left fn -> fn `Set.member` Set.map mpPath (smp c)
Right mn -> mn `Set.member` Set.map mpModule (smp c)
in if memb
then Set.insert (gmcName c) s
else s
where
smp c = Map.keysSet $ gmgGraph $ gmcHomeModuleGraph c
foldr' b as f = Map.foldr f b as
findCandidates :: [Set ChComponentName] -> Set ChComponentName
findCandidates [] = Set.empty
findCandidates scns = foldl1 Set.intersection scns
pickComponent :: Set ChComponentName -> ChComponentName
pickComponent scn = Set.findMin scn
packageGhcOptions :: (Applicative m, IOish m, GmEnv m, GmState m, GmLog m)
=> m [GHCOption]
packageGhcOptions = do
crdl <- cradle
case cradleProjectType crdl of
CabalProject -> getGhcMergedPkgOptions
_ -> sandboxOpts crdl
-- also works for plain projects!
sandboxOpts :: MonadIO m => Cradle -> m [String]
sandboxOpts crdl = do
pkgDbStack <- liftIO $ getSandboxPackageDbStack $ cradleRootDir crdl
let pkgOpts = ghcDbStackOpts pkgDbStack
return $ ["-i" ++ d | d <- [wdir,rdir]] ++ pkgOpts ++ ["-Wall"]
where
(wdir, rdir) = (cradleCurrentDir crdl, cradleRootDir crdl)
getSandboxPackageDbStack :: FilePath
-- ^ Project Directory (where the cabal.sandbox.config
-- file would be if it exists)
-> IO [GhcPkgDb]
getSandboxPackageDbStack cdir =
([GlobalDb] ++) . maybe [UserDb] return <$> getSandboxDb cdir
resolveGmComponent :: (IOish m, GmLog m, GmEnv m)
=> Maybe [CompilationUnit] -- ^ Updated modules
-> GmComponent 'GMCRaw (Set ModulePath)
-> m (GmComponent 'GMCResolved (Set ModulePath))
resolveGmComponent mums c@GmComponent {..} = do
withLightHscEnv ghcOpts $ \env -> do
let srcDirs = if null gmcSourceDirs then [""] else gmcSourceDirs
let mg = gmcHomeModuleGraph
let simp = gmcEntrypoints
sump <- case mums of
Nothing -> return simp
Just ums ->
Set.fromList . catMaybes <$>
mapM (resolveModule env srcDirs) ums
mg' <- canonicalizeModuleGraph =<< updateHomeModuleGraph env mg simp sump
return $ c { gmcEntrypoints = simp, gmcHomeModuleGraph = mg' }
where ghcOpts = concat [
gmcGhcSrcOpts,
gmcGhcLangOpts,
[ "-optP-include", "-optP" ++ macrosHeaderPath ]
]
resolveEntrypoint :: (IOish m, GmEnv m, GmLog m)
=> Cradle
-> GmComponent 'GMCRaw ChEntrypoint
-> m (GmComponent 'GMCRaw (Set ModulePath))
resolveEntrypoint Cradle {..} c@GmComponent {..} = do
withLightHscEnv gmcGhcSrcOpts $ \env -> do
let srcDirs = if null gmcSourceDirs then [""] else gmcSourceDirs
eps <- liftIO $ resolveChEntrypoints cradleRootDir gmcEntrypoints
rms <- resolveModule env srcDirs `mapM` eps
return c { gmcEntrypoints = Set.fromList $ catMaybes rms }
-- TODO: remember that he file from `main-is:` is always module `Main` and let
-- ghc do the warning about it. Right now we run that module through
-- resolveModule like any other
resolveChEntrypoints :: FilePath -> ChEntrypoint -> IO [CompilationUnit]
resolveChEntrypoints _ (ChLibEntrypoint em om) =
return $ map (Right . chModToMod) (em ++ om)
resolveChEntrypoints _ (ChExeEntrypoint main om) =
return $ [Left main] ++ map (Right . chModToMod) om
resolveChEntrypoints srcDir ChSetupEntrypoint = do
shs <- doesFileExist (srcDir </> "Setup.hs")
slhs <- doesFileExist (srcDir </> "Setup.lhs")
return $ case (shs, slhs) of
(True, _) -> [Left "Setup.hs"]
(_, True) -> [Left "Setup.lhs"]
(False, False) -> []
chModToMod :: ChModuleName -> ModuleName
chModToMod (ChModuleName mn) = mkModuleName mn
resolveModule :: (MonadIO m, GmEnv m, GmLog m) =>
HscEnv -> [FilePath] -> CompilationUnit -> m (Maybe ModulePath)
resolveModule env _srcDirs (Right mn) =
liftIO $ traverse canonicalizeModulePath =<< findModulePath env mn
resolveModule env srcDirs (Left fn') = do
mfn <- liftIO $ findFile' srcDirs fn'
case mfn of
Nothing -> return Nothing
Just fn'' -> do
fn <- liftIO $ canonicalizePath fn''
emn <- liftIO $ fileModuleName env fn
case emn of
Left errs -> do
gmLog GmWarning ("resolveModule " ++ show fn) $
Monoid.mempty $+$ (vcat $ map text errs)
return Nothing -- TODO: should expose these errors otherwise
-- modules with preprocessor/parse errors are
-- going to be missing
Right mmn -> return $ Just $
case mmn of
Nothing -> mkMainModulePath fn
Just mn -> ModulePath mn fn
where
-- needed for ghc 7.4
findFile' dirs file =
getFirst . mconcat <$> mapM (fmap First . mightExist . (</>file)) dirs
-- fileModuleName fn (dir:dirs)
-- | makeRelative dir fn /= fn
type CompilationUnit = Either FilePath ModuleName
resolveGmComponents :: (IOish m, GmState m, GmLog m, GmEnv m)
=> Maybe [CompilationUnit]
-- ^ Updated modules
-> [GmComponent 'GMCRaw (Set ModulePath)]
-> m (Map ChComponentName (GmComponent 'GMCResolved (Set ModulePath)))
resolveGmComponents mumns cs = do
s <- gmsGet
m' <- foldrM' (gmComponents s) cs $ \c m -> do
case Map.lookup (gmcName c) m of
Nothing -> insertUpdated m c
Just c' -> if same gmcRawEntrypoints c c' && same gmcGhcSrcOpts c c'
then return m
else insertUpdated m c
gmsPut s { gmComponents = m' }
return m'
where
foldrM' b fa f = foldrM f b fa
insertUpdated m c = do
rc <- resolveGmComponent mumns c
return $ Map.insert (gmcName rc) rc m
same :: Eq b
=> (forall t a. GmComponent t a -> b)
-> GmComponent u c -> GmComponent v d -> Bool
same f a b = (f a) == (f b)
-- | Set the files as targets and load them.
loadTargets :: IOish m => [String] -> GmlT m ()
loadTargets filesOrModules = do
gmLog GmDebug "loadTargets" $
text "Loading" <+>: fsep (map text filesOrModules)
targets <- forM filesOrModules (flip guessTarget Nothing)
setTargets targets
mode <- getCompilerMode
if mode == Intelligent
then loadTargets' Intelligent
else do
mdls <- depanal [] False
let fallback = needsFallback mdls
if fallback then do
resetTargets targets
setIntelligent
gmLog GmInfo "loadTargets" $
text "Target needs interpeter, switching to LinkInMemory/HscInterpreted. Perfectly normal if anything is using TemplateHaskell, QuasiQuotes or PatternSynonyms."
loadTargets' Intelligent
else
loadTargets' Simple
where
loadTargets' Simple = do
void $ load LoadAllTargets
mapM_ (parseModule >=> typecheckModule >=> desugarModule) =<< getModuleGraph
loadTargets' Intelligent = do
df <- getSessionDynFlags
void $ setSessionDynFlags (setModeIntelligent df)
void $ load LoadAllTargets
resetTargets targets = do
setTargets []
void $ load LoadAllTargets
setTargets targets
setIntelligent = do
newdf <- setModeIntelligent <$> getSessionDynFlags
void $ setSessionDynFlags newdf
setCompilerMode Intelligent
needsFallback :: ModuleGraph -> Bool
needsFallback = any $ \ms ->
let df = ms_hspp_opts ms in
Opt_TemplateHaskell `xopt` df
|| Opt_QuasiQuotes `xopt` df
#if __GLASGOW_HASKELL__ >= 708
|| (Opt_PatternSynonyms `xopt` df)
#endif
cabalResolvedComponents :: (IOish m) =>
GhcModT m (Map ChComponentName (GmComponent 'GMCResolved (Set ModulePath)))
cabalResolvedComponents = do
crdl@(Cradle{..}) <- cradle
comps <- mapM (resolveEntrypoint crdl) =<< getComponents
cached cradleRootDir resolvedComponentsCache comps