368 lines
11 KiB
Haskell
368 lines
11 KiB
Haskell
{-# LANGUAGE CPP, GeneralizedNewtypeDeriving, FlexibleInstances #-}
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{-# LANGUAGE FlexibleContexts, MultiParamTypeClasses, RankNTypes #-}
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{-# LANGUAGE TypeFamilies, UndecidableInstances, RecordWildCards #-}
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{-# LANGUAGE StandaloneDeriving #-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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module Language.Haskell.GhcMod.Monad (
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-- * Monad Types
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GhcMod
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, GhcModT
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, IOish
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, GhcModEnv(..)
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, GhcModState(..)
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, GhcModWriter
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-- * Monad utilities
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, runGhcMod
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, runGhcModT
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, runGhcModT'
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, withErrorHandler
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, liftGhcMod
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, toGhcMod
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, newGhcModEnv
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, options
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, cradle
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, module Control.Monad.Reader.Class
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, module Control.Monad.Writer.Class
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, module Control.Monad.State.Class
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) where
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#if __GLASGOW_HASKELL__ < 708
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-- 'CoreMonad.MonadIO' and 'Control.Monad.IO.Class.MonadIO' are different
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-- classes before ghc 7.8
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#define DIFFERENT_MONADIO 1
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-- RWST doen't have a MonadIO instance before ghc 7.8
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#define MONADIO_INSTANCES 1
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#endif
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Cradle
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import Language.Haskell.GhcMod.DynFlags
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import Language.Haskell.GhcMod.GhcPkg
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import Language.Haskell.GhcMod.GHCChoice
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import Language.Haskell.GhcMod.CabalApi
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import qualified Language.Haskell.GhcMod.Gap as Gap
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import DynFlags
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import Exception
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import GHC
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import qualified GHC as G
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import GHC.Paths (libdir)
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import GhcMonad
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#if __GLASGOW_HASKELL__ <= 702
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import HscTypes
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#endif
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-- MonadUtils of GHC 7.6 or earlier defines its own MonadIO.
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-- RWST does not automatically become an instance of MonadIO.
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-- MonadUtils of GHC 7.8 or later imports MonadIO in Monad.Control.IO.Class.
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-- So, RWST automatically becomes an instance of MonadIO.
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import MonadUtils
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#if DIFFERENT_MONADIO
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import Control.Monad.Trans.Class (lift)
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import qualified Control.Monad.IO.Class
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import Data.Monoid (Monoid)
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#endif
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import Control.Applicative (Alternative)
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import Control.Monad (MonadPlus, liftM, void)
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import Control.Monad.Base (MonadBase, liftBase)
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import Control.Monad.Reader.Class
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import Control.Monad.State.Class
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import Control.Monad.Trans.Class
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#if __GLASGOW_HASKELL__ < 708
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import Control.Monad.Trans.Maybe
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#endif
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import Control.Monad.Trans.Control (MonadBaseControl(..), StM, liftBaseWith,
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control, liftBaseOp, liftBaseOp_)
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import Control.Monad.Trans.RWS.Lazy (RWST(..), runRWST)
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import Control.Monad.Writer.Class
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import Control.Monad.Error (Error(..), ErrorT(..), MonadError)
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import Data.Maybe (fromJust, isJust)
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import Data.IORef (IORef, readIORef, writeIORef, newIORef)
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import System.Exit (exitSuccess)
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import System.IO (hPutStr, hPrint, stderr)
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import System.Directory (getCurrentDirectory)
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----------------------------------------------------------------
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data GhcModEnv = GhcModEnv {
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gmGhcSession :: !(IORef HscEnv)
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, gmOptions :: Options
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, gmCradle :: Cradle
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}
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data GhcModState = GhcModState deriving (Eq,Show,Read)
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defaultState :: GhcModState
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defaultState = GhcModState
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type GhcModWriter = ()
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data GhcModError = GMENoMsg
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| GMEString String
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| GMECabal
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| GMEGhc
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deriving (Eq,Show,Read)
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instance Error GhcModError where
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noMsg = GMENoMsg
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strMsg = GMEString
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----------------------------------------------------------------
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type IOish m = (Functor m, MonadIO m, MonadBaseControl IO m)
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type GhcMod a = GhcModT (ErrorT GhcModError IO) a
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newtype GhcModT m a = GhcModT {
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unGhcModT :: RWST GhcModEnv GhcModWriter GhcModState m a
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} deriving (Functor
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, Applicative
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, Alternative
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, Monad
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, MonadPlus
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, MonadIO
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#if DIFFERENT_MONADIO
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, Control.Monad.IO.Class.MonadIO
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#endif
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, MonadReader GhcModEnv
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, MonadWriter GhcModWriter
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, MonadState GhcModState
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, MonadTrans
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)
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deriving instance MonadError GhcModError m => MonadError GhcModError (GhcModT m)
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#if MONADIO_INSTANCES
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instance (Monoid w, MonadIO m) => MonadIO (RWST r w s m) where
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liftIO = lift . liftIO
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instance (Error e, MonadIO m) => MonadIO (ErrorT e m) where
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liftIO = lift . liftIO
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instance (MonadIO m) => MonadIO (MaybeT m) where
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liftIO = lift . liftIO
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#endif
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----------------------------------------------------------------
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-- | Initialize the 'DynFlags' relating to the compilation of a single
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-- file or GHC session according to the 'Cradle' and 'Options'
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-- provided.
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initializeFlagsWithCradle :: GhcMonad m
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=> Options
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-> Cradle
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-> m ()
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initializeFlagsWithCradle opt c
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| cabal = withCabal |||> withSandbox
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| otherwise = withSandbox
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where
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mCradleFile = cradleCabalFile c
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cabal = isJust mCradleFile
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ghcopts = ghcOpts opt
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withCabal = do
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pkgDesc <- liftIO $ parseCabalFile $ fromJust mCradleFile
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compOpts <- liftIO $ getCompilerOptions ghcopts c pkgDesc
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initSession CabalPkg opt compOpts
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withSandbox = initSession SingleFile opt compOpts
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where
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importDirs = [".","..","../..","../../..","../../../..","../../../../.."]
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pkgOpts = ghcDbStackOpts $ cradlePkgDbStack c
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compOpts
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| null pkgOpts = CompilerOptions ghcopts importDirs []
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| otherwise = CompilerOptions (ghcopts ++ pkgOpts) [wdir,rdir] []
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wdir = cradleCurrentDir c
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rdir = cradleRootDir c
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initSession :: GhcMonad m
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=> Build
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-> Options
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-> CompilerOptions
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-> m ()
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initSession build Options {..} CompilerOptions {..} = do
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df <- G.getSessionDynFlags
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void $ G.setSessionDynFlags =<< addCmdOpts ghcOptions
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( setModeSimple
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$ setFlags
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$ setIncludeDirs includeDirs
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$ setBuildEnv build
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$ setEmptyLogger
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$ Gap.addPackageFlags depPackages df)
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----------------------------------------------------------------
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newGhcModEnv :: Options -> FilePath -> IO GhcModEnv
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newGhcModEnv opt dir = do
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session <- newIORef (error "empty session")
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c <- findCradle' dir
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return GhcModEnv {
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gmGhcSession = session
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, gmOptions = opt
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, gmCradle = c
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}
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-- | Run a @GhcModT m@ computation, i.e. one with a custom underlying monad.
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--
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-- You probably don't want this, look at 'runGhcMod' instead.
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runGhcModT :: IOish m => Options -> GhcModT m a -> m a
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runGhcModT opt action = do
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env <- liftBase $ newGhcModEnv opt =<< getCurrentDirectory
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(a,(_,_)) <- runGhcModT' env defaultState $ do
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dflags <- getSessionDynFlags
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defaultCleanupHandler dflags $ do
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initializeFlagsWithCradle opt (gmCradle env)
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action
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return a
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-- | Run a computation inside @GhcModT@ providing the RWST environment and
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-- initial state. This is a low level function, use it only if you know what to
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-- do with 'GhcModEnv' and 'GhcModState'.
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--
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-- You should probably look at 'runGhcModT' instead.
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runGhcModT' :: IOish m
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=> GhcModEnv
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-> GhcModState
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-> GhcModT m a
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-> m (a,(GhcModState, GhcModWriter))
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runGhcModT' r s a = do
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(a',s',w) <- runRWST (unGhcModT $ initGhcMonad (Just libdir) >> a) r s
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return (a',(s',w))
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-- | Run a 'GhcMod' computation. If you want an underlying monad other than
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-- 'ErrorT e IO' you should look at 'runGhcModT'
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runGhcMod :: Options
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-> GhcMod a
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-> IO (Either GhcModError a)
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runGhcMod o a =
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runErrorT $ runGhcModT o a
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liftErrorT :: IOish m => GhcModT m a -> GhcModT (ErrorT GhcModError m) a
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liftErrorT action =
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GhcModT $ RWST $ \e s -> ErrorT $ Right <$> (runRWST $ unGhcModT action) e s
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-- | Lift @(GhcModT IO)@ into @GhcMod@, which is an alias for @GhcModT (ErrorT
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-- GhcModError IO)@.
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liftGhcMod :: GhcModT IO a -> GhcMod a
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liftGhcMod = liftErrorT
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----------------------------------------------------------------
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withErrorHandler :: IOish m => String -> GhcModT m a -> GhcModT m a
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withErrorHandler label = ghandle ignore
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where
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ignore :: IOish m => SomeException -> GhcModT m a
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ignore e = liftIO $ do
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hPutStr stderr $ label ++ ":0:0:Error:"
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hPrint stderr e
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exitSuccess
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-- | This is only a transitional mechanism don't use it for new code.
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toGhcMod :: IOish m => Ghc a -> GhcModT m a
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toGhcMod a = do
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s <- gmGhcSession <$> ask
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liftIO $ unGhc a $ Session s
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----------------------------------------------------------------
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options :: IOish m => GhcModT m Options
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options = gmOptions <$> ask
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cradle :: IOish m => GhcModT m Cradle
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cradle = gmCradle <$> ask
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instance (MonadBaseControl IO m) => MonadBase IO (GhcModT m) where
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liftBase = GhcModT . liftBase
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instance (MonadBaseControl IO m) => MonadBaseControl IO (GhcModT m) where
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newtype StM (GhcModT m) a = StGhcMod {
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unStGhcMod :: StM (RWST GhcModEnv GhcModWriter GhcModState m) a }
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liftBaseWith f = GhcModT . liftBaseWith $ \runInBase ->
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f $ liftM StGhcMod . runInBase . unGhcModT
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restoreM = GhcModT . restoreM . unStGhcMod
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{-# INLINE liftBaseWith #-}
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{-# INLINE restoreM #-}
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-- GHC cannot prove the following instances to be decidable automatically using
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-- the FlexibleContexts extension as they violate the second Paterson Condition,
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-- namely that: The assertion has fewer constructors and variables (taken
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-- together and counting repetitions) than the head. Specifically the
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-- @MonadBaseControl IO m@ constraint is causing this violation.
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--
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-- Proof of termination:
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--
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-- Assuming all constraints containing the variable `m' exist and are decidable
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-- we show termination by manually replacing the current set of constraints with
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-- their own set of constraints and show that this, after a finite number of
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-- steps, results in the empty set, i.e. not having to check any more
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-- constraints.
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--
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-- We start by setting the constraints to be those immediate constraints of the
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-- instance declaration which cannot be proven decidable automatically for the
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-- type under consideration.
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--
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-- @
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-- { MonadBaseControl IO m }
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-- @
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--
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-- Classes used:
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--
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-- * @class MonadBase b m => MonadBaseControl b m@
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--
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-- @
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-- { MonadBase IO m }
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-- @
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--
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-- Classes used:
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--
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-- * @class (Applicative b, Applicative m, Monad b, Monad m) => MonadBase b m@
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--
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-- @
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-- { Applicative IO, Applicative m, Monad IO, Monad m }
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-- @
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--
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-- Classes used:
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--
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-- * @class Monad m@
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-- * @class Applicative f => Functor f@
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--
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-- @
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-- { Functor m }
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-- @
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--
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-- Classes used:
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--
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-- * @class Functor f@
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--
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-- @
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-- { }
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-- @
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-- ∎
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instance (Functor m, MonadIO m, MonadBaseControl IO m)
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=> GhcMonad (GhcModT m) where
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getSession = (liftIO . readIORef) . gmGhcSession =<< ask
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setSession a = (liftIO . flip writeIORef a) . gmGhcSession =<< ask
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#if __GLASGOW_HASKELL__ >= 706
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instance (Functor m, MonadIO m, MonadBaseControl IO m)
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=> HasDynFlags (GhcModT m) where
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getDynFlags = getSessionDynFlags
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#endif
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instance (MonadIO m, MonadBaseControl IO m)
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=> ExceptionMonad (GhcModT m) where
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gcatch act handler = control $ \run ->
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run act `gcatch` (run . handler)
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gmask = liftBaseOp gmask . liftRestore
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where liftRestore f r = f $ liftBaseOp_ r
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