    {-# LANGUAGE CPP #-}
    {-# LANGUAGE TupleSections, RecordWildCards #-}
    {-# LANGUAGE BangPatterns #-}
    {-# LANGUAGE LambdaCase #-}

    --
    --  (c) The University of Glasgow 2002-2006

    -- | The loader
    --
    -- This module deals with the top-level issues of dynamic linking (loading),
    -- calling the object-code linker and the byte-code linker where necessary.
    module GHC.Linker.Loader
       ( Loader (..)
       , LoaderState (..)
       , initLoaderState
       , uninitializedLoader
       , showLoaderState
       , getLoaderState
       -- * Load & Unload
       , loadExpr
       , loadDecls
       , loadPackages
       , loadModule
       , loadCmdLineLibs
       , loadName
       , unload
       -- * LoadedEnv
       , withExtendedLoadedEnv
       , extendLoadedEnv
       , deleteFromLoadedEnv
       )
    where

    import GHC.Prelude

    import GHC.Settings

    import GHC.Platform
    import GHC.Platform.Ways

    import GHC.Driver.Phases
    import GHC.Driver.Env
    import GHC.Driver.Session
    import GHC.Driver.Ppr
    import GHC.Driver.Config
    import GHC.Driver.Config.Diagnostic
    import GHC.Driver.Config.Finder

    import GHC.Tc.Utils.Monad

    import GHC.Runtime.Interpreter
    import GHCi.RemoteTypes

    import GHC.ByteCode.Linker
    import GHC.ByteCode.Asm
    import GHC.ByteCode.Types

    import GHC.SysTools

    import GHC.Types.Basic
    import GHC.Types.Name
    import GHC.Types.Name.Env
    import GHC.Types.SrcLoc
    import GHC.Types.Unique.DSet
    import GHC.Types.Unique.DFM

    import GHC.Utils.Outputable
    import GHC.Utils.Panic
    import GHC.Utils.Panic.Plain
    import GHC.Utils.Error
    import GHC.Utils.Logger
    import GHC.Utils.TmpFs

    import GHC.Unit.Env
    import GHC.Unit.Finder
    import GHC.Unit.Module
    import GHC.Unit.Module.ModIface
    import GHC.Unit.Module.Deps
    import GHC.Unit.Home.ModInfo
    import GHC.Unit.State as Packages

    import qualified GHC.Data.ShortText as ST
    import qualified GHC.Data.Maybe as Maybes
    import GHC.Data.FastString

    import GHC.Linker.MacOS
    import GHC.Linker.Dynamic
    import GHC.Linker.Types

    -- Standard libraries
    import Control.Monad

    import qualified Data.Set as Set
    import qualified Data.Map as M
    import Data.Char (isSpace)
    import Data.IORef
    import Data.List (intercalate, isPrefixOf, isSuffixOf, nub, partition)
    import Data.Maybe
    import Control.Concurrent.MVar
    import qualified Control.Monad.Catch as MC

    import System.FilePath
    import System.Directory
    import System.IO.Unsafe
    import System.Environment (lookupEnv)

    #if defined(mingw32_HOST_OS)
    import System.Win32.Info (getSystemDirectory)
    #endif

    import GHC.Utils.Exception

    import GHC.Unit.Module.Graph
    import GHC.Types.SourceFile
    import GHC.Utils.Misc
    import GHC.Iface.Load
    import GHC.Unit.Home
    import Data.Either
    import Control.Applicative

    uninitialised :: a
    uninitialised :: forall a. a
    uninitialised = String -> a
    forall a. String -> a
    panic String
    "Loader not initialised"

    modifyLoaderState_ :: Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ :: Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp LoaderState -> IO LoaderState
    f =
      MVar (Maybe LoaderState)
    -> (Maybe LoaderState -> IO (Maybe LoaderState)) -> IO ()
    forall a. MVar a -> (a -> IO a) -> IO ()
    modifyMVar_ (Loader -> MVar (Maybe LoaderState)
    loader_state (Interp -> Loader
    interpLoader Interp
    interp))
        ((LoaderState -> Maybe LoaderState)
    -> IO LoaderState -> IO (Maybe LoaderState)
    forall a b. (a -> b) -> IO a -> IO b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap LoaderState -> Maybe LoaderState
    forall a. a -> Maybe a
    forall (f :: * -> *) a. Applicative f => a -> f a
    pure (IO LoaderState -> IO (Maybe LoaderState))
    -> (Maybe LoaderState -> IO LoaderState)
    -> Maybe LoaderState
    -> IO (Maybe LoaderState)
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . LoaderState -> IO LoaderState
    f (LoaderState -> IO LoaderState)
    -> (Maybe LoaderState -> LoaderState)
    -> Maybe LoaderState
    -> IO LoaderState
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . LoaderState -> Maybe LoaderState -> LoaderState
    forall a. a -> Maybe a -> a
    fromMaybe LoaderState
    forall a. a
    uninitialised)

    modifyLoaderState :: Interp -> (LoaderState -> IO (LoaderState, a)) -> IO a
    modifyLoaderState :: forall a. Interp -> (LoaderState -> IO (LoaderState, a)) -> IO a
    modifyLoaderState Interp
    interp LoaderState -> IO (LoaderState, a)
    f =
      MVar (Maybe LoaderState)
    -> (Maybe LoaderState -> IO (Maybe LoaderState, a)) -> IO a
    forall a b. MVar a -> (a -> IO (a, b)) -> IO b
    modifyMVar (Loader -> MVar (Maybe LoaderState)
    loader_state (Interp -> Loader
    interpLoader Interp
    interp))
        ((LoaderState -> Maybe LoaderState)
    -> IO (LoaderState, a) -> IO (Maybe LoaderState, a)
    forall {f :: * -> *} {t} {a} {b}.
    Functor f =>
    (t -> a) -> f (t, b) -> f (a, b)
    fmapFst LoaderState -> Maybe LoaderState
    forall a. a -> Maybe a
    forall (f :: * -> *) a. Applicative f => a -> f a
    pure (IO (LoaderState, a) -> IO (Maybe LoaderState, a))
    -> (Maybe LoaderState -> IO (LoaderState, a))
    -> Maybe LoaderState
    -> IO (Maybe LoaderState, a)
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . LoaderState -> IO (LoaderState, a)
    f (LoaderState -> IO (LoaderState, a))
    -> (Maybe LoaderState -> LoaderState)
    -> Maybe LoaderState
    -> IO (LoaderState, a)
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . LoaderState -> Maybe LoaderState -> LoaderState
    forall a. a -> Maybe a -> a
    fromMaybe LoaderState
    forall a. a
    uninitialised)
      where fmapFst :: (t -> a) -> f (t, b) -> f (a, b)
    fmapFst t -> a
    f = ((t, b) -> (a, b)) -> f (t, b) -> f (a, b)
    forall a b. (a -> b) -> f a -> f b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap (\(t
    x, b
    y) -> (t -> a
    f t
    x, b
    y))

    getLoaderState :: Interp -> IO (Maybe LoaderState)
    getLoaderState :: Interp -> IO (Maybe LoaderState)
    getLoaderState Interp
    interp = MVar (Maybe LoaderState) -> IO (Maybe LoaderState)
    forall a. MVar a -> IO a
    readMVar (Loader -> MVar (Maybe LoaderState)
    loader_state (Interp -> Loader
    interpLoader Interp
    interp))

    emptyLoaderState :: LoaderState
    emptyLoaderState :: LoaderState
    emptyLoaderState = LoaderState
       { closure_env :: ClosureEnv
    closure_env = ClosureEnv
    forall a. NameEnv a
    emptyNameEnv
       , itbl_env :: ItblEnv
    itbl_env    = ItblEnv
    forall a. NameEnv a
    emptyNameEnv
       , pkgs_loaded :: PkgsLoaded
    pkgs_loaded = PkgsLoaded
    init_pkgs
       , bcos_loaded :: LinkableSet
    bcos_loaded = LinkableSet
    forall a. ModuleEnv a
    emptyModuleEnv
       , objs_loaded :: LinkableSet
    objs_loaded = LinkableSet
    forall a. ModuleEnv a
    emptyModuleEnv
       , temp_sos :: [(String, String)]
    temp_sos = []
       }
      -- Packages that don't need loading, because the compiler
      -- shares them with the interpreted program.
      --
      -- The linker's symbol table is populated with RTS symbols using an
      -- explicit list.  See rts/Linker.c for details.
      where init_pkgs :: PkgsLoaded
    init_pkgs = UnitId -> LoadedPkgInfo -> PkgsLoaded
    forall key elt. Uniquable key => key -> elt -> UniqDFM key elt
    unitUDFM UnitId
    rtsUnitId (UnitId
    -> [LibrarySpec]
    -> [LibrarySpec]
    -> UniqDSet UnitId
    -> LoadedPkgInfo
    LoadedPkgInfo UnitId
    rtsUnitId [] [] UniqDSet UnitId
    forall a. UniqDSet a
    emptyUniqDSet)

    extendLoadedEnv :: Interp -> [(Name,ForeignHValue)] -> IO ()
    extendLoadedEnv :: Interp -> [(Name, ForeignHValue)] -> IO ()
    extendLoadedEnv Interp
    interp [(Name, ForeignHValue)]
    new_bindings =
      Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp ((LoaderState -> IO LoaderState) -> IO ())
    -> (LoaderState -> IO LoaderState) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \pls :: LoaderState
    pls@LoaderState{[(String, String)]
    ClosureEnv
    ItblEnv
    PkgsLoaded
    LinkableSet
    closure_env :: LoaderState -> ClosureEnv
    itbl_env :: LoaderState -> ItblEnv
    pkgs_loaded :: LoaderState -> PkgsLoaded
    bcos_loaded :: LoaderState -> LinkableSet
    objs_loaded :: LoaderState -> LinkableSet
    temp_sos :: LoaderState -> [(String, String)]
    closure_env :: ClosureEnv
    itbl_env :: ItblEnv
    bcos_loaded :: LinkableSet
    objs_loaded :: LinkableSet
    pkgs_loaded :: PkgsLoaded
    temp_sos :: [(String, String)]
    ..} -> do
        let new_ce :: ClosureEnv
    new_ce = ClosureEnv -> [(Name, ForeignHValue)] -> ClosureEnv
    extendClosureEnv ClosureEnv
    closure_env [(Name, ForeignHValue)]
    new_bindings
        LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState -> IO LoaderState) -> LoaderState -> IO LoaderState
    forall a b. (a -> b) -> a -> b
    $! LoaderState
    pls{ closure_env :: ClosureEnv
    closure_env = ClosureEnv
    new_ce }
        -- strictness is important for not retaining old copies of the pls

    deleteFromLoadedEnv :: Interp -> [Name] -> IO ()
    deleteFromLoadedEnv :: Interp -> [Name] -> IO ()
    deleteFromLoadedEnv Interp
    interp [Name]
    to_remove =
      Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp ((LoaderState -> IO LoaderState) -> IO ())
    -> (LoaderState -> IO LoaderState) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls -> do
        let ce :: ClosureEnv
    ce = LoaderState -> ClosureEnv
    closure_env LoaderState
    pls
        let new_ce :: ClosureEnv
    new_ce = ClosureEnv -> [Name] -> ClosureEnv
    forall a. NameEnv a -> [Name] -> NameEnv a
    delListFromNameEnv ClosureEnv
    ce [Name]
    to_remove
        LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls{ closure_env :: ClosureEnv
    closure_env = ClosureEnv
    new_ce }

    -- | Load the module containing the given Name and get its associated 'HValue'.
    --
    -- Throws a 'ProgramError' if loading fails or the name cannot be found.
    loadName :: Interp -> HscEnv -> Name -> IO (ForeignHValue, [Linkable], PkgsLoaded)
    loadName :: Interp
    -> HscEnv -> Name -> IO (ForeignHValue, [Linkable], PkgsLoaded)
    loadName Interp
    interp HscEnv
    hsc_env Name
    name = do
      Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env
      Interp
    -> (LoaderState
        -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded)))
    -> IO (ForeignHValue, [Linkable], PkgsLoaded)
    forall a. Interp -> (LoaderState -> IO (LoaderState, a)) -> IO a
    modifyLoaderState Interp
    interp ((LoaderState
      -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded)))
     -> IO (ForeignHValue, [Linkable], PkgsLoaded))
    -> (LoaderState
        -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded)))
    -> IO (ForeignHValue, [Linkable], PkgsLoaded)
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls0 -> do
        (LoaderState
    pls, [Linkable]
    links, PkgsLoaded
    pkgs) <- if Bool -> Bool
    not (Name -> Bool
    isExternalName Name
    name)
           then (LoaderState, [Linkable], PkgsLoaded)
    -> IO (LoaderState, [Linkable], PkgsLoaded)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls0, [], PkgsLoaded
    forall key elt. UniqDFM key elt
    emptyUDFM)
           else do
             (LoaderState
    pls', SuccessFlag
    ok, [Linkable]
    links, PkgsLoaded
    pkgs) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls0 SrcSpan
    noSrcSpan
                                          [(() :: Constraint) => Name -> Module
    Name -> Module
    nameModule Name
    name]
             if SuccessFlag -> Bool
    failed SuccessFlag
    ok
               then GhcException -> IO (LoaderState, [Linkable], PkgsLoaded)
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError String
    "")
               else (LoaderState, [Linkable], PkgsLoaded)
    -> IO (LoaderState, [Linkable], PkgsLoaded)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls', [Linkable]
    links, PkgsLoaded
    pkgs)

        case ClosureEnv -> Name -> Maybe (Name, ForeignHValue)
    forall a. NameEnv a -> Name -> Maybe a
    lookupNameEnv (LoaderState -> ClosureEnv
    closure_env LoaderState
    pls) Name
    name of
          Just (Name
    _,ForeignHValue
    aa) -> (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls,(ForeignHValue
    aa, [Linkable]
    links, PkgsLoaded
    pkgs))
          Maybe (Name, ForeignHValue)
    Nothing     -> Bool
    -> SDoc
    -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    forall a. HasCallStack => Bool -> SDoc -> a -> a
    assertPpr (Name -> Bool
    isExternalName Name
    name) (Name -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Name
    name) (IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
     -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded)))
    -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    forall a b. (a -> b) -> a -> b
    $
                         do let sym_to_find :: FastString
    sym_to_find = Name -> String -> FastString
    nameToCLabel Name
    name String
    "closure"
                            Maybe HValueRef
    m <- Interp -> String -> IO (Maybe HValueRef)
    lookupClosure Interp
    interp (FastString -> String
    unpackFS FastString
    sym_to_find)
                            ForeignHValue
    r <- case Maybe HValueRef
    m of
                              Just HValueRef
    hvref -> Interp -> HValueRef -> IO ForeignHValue
    forall a. Interp -> RemoteRef a -> IO (ForeignRef a)
    mkFinalizedHValue Interp
    interp HValueRef
    hvref
                              Maybe HValueRef
    Nothing -> String -> String -> IO ForeignHValue
    forall a. String -> String -> IO a
    linkFail String
    "GHC.Linker.Loader.loadName"
                                           (FastString -> String
    unpackFS FastString
    sym_to_find)
                            (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    -> IO (LoaderState, (ForeignHValue, [Linkable], PkgsLoaded))
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls,(ForeignHValue
    r, [Linkable]
    links, PkgsLoaded
    pkgs))

    loadDependencies
      :: Interp
      -> HscEnv
      -> LoaderState
      -> SrcSpan
      -> [Module]
      -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded) -- ^ returns the set of linkables required
    loadDependencies :: Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls SrcSpan
    span [Module]
    needed_mods = do
    --   initLoaderState (hsc_dflags hsc_env) dl
       let dflags :: DynFlags
    dflags = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
       -- The interpreter and dynamic linker can only handle object code built
       -- the "normal" way, i.e. no non-std ways like profiling or ticky-ticky.
       -- So here we check the build tag: if we're building a non-standard way
       -- then we need to find & link object files built the "normal" way.
       Maybe String
    maybe_normal_osuf <- DynFlags -> Interp -> SrcSpan -> IO (Maybe String)
    checkNonStdWay DynFlags
    dflags Interp
    interp SrcSpan
    span

       -- Find what packages and linkables are required
       ([Linkable]
    lnks, [Linkable]
    all_lnks, [UnitId]
    pkgs, UniqDSet UnitId
    this_pkgs_needed)
          <- HscEnv
    -> LoaderState
    -> Maybe String
    -> SrcSpan
    -> [Module]
    -> IO ([Linkable], [Linkable], [UnitId], UniqDSet UnitId)
    getLinkDeps HscEnv
    hsc_env LoaderState
    pls
               Maybe String
    maybe_normal_osuf SrcSpan
    span [Module]
    needed_mods

       -- Link the packages and modules required
       LoaderState
    pls1 <- Interp -> HscEnv -> [UnitId] -> LoaderState -> IO LoaderState
    loadPackages' Interp
    interp HscEnv
    hsc_env [UnitId]
    pkgs LoaderState
    pls
       (LoaderState
    pls2, SuccessFlag
    succ) <- Interp
    -> HscEnv
    -> LoaderState
    -> [Linkable]
    -> IO (LoaderState, SuccessFlag)
    loadModuleLinkables Interp
    interp HscEnv
    hsc_env LoaderState
    pls1 [Linkable]
    lnks
       let this_pkgs_loaded :: PkgsLoaded
    this_pkgs_loaded = PkgsLoaded -> UniqDFM UnitId UnitId -> PkgsLoaded
    forall key elt elt2.
    UniqDFM key elt -> UniqDFM key elt2 -> UniqDFM key elt
    udfmRestrictKeys PkgsLoaded
    all_pkgs_loaded (UniqDFM UnitId UnitId -> PkgsLoaded)
    -> UniqDFM UnitId UnitId -> PkgsLoaded
    forall a b. (a -> b) -> a -> b
    $ UniqDSet UnitId -> UniqDFM UnitId UnitId
    forall a. UniqDSet a -> UniqDFM a a
    getUniqDSet UniqDSet UnitId
    trans_pkgs_needed
           all_pkgs_loaded :: PkgsLoaded
    all_pkgs_loaded = LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls2
           trans_pkgs_needed :: UniqDSet UnitId
    trans_pkgs_needed = [UniqDSet UnitId] -> UniqDSet UnitId
    forall a. [UniqDSet a] -> UniqDSet a
    unionManyUniqDSets (UniqDSet UnitId
    this_pkgs_needed UniqDSet UnitId -> [UniqDSet UnitId] -> [UniqDSet UnitId]
    forall a. a -> [a] -> [a]
    : [ LoadedPkgInfo -> UniqDSet UnitId
    loaded_pkg_trans_deps LoadedPkgInfo
    pkg
                                                                      | UnitId
    pkg_id <- UniqDSet UnitId -> [UnitId]
    forall a. UniqDSet a -> [a]
    uniqDSetToList UniqDSet UnitId
    this_pkgs_needed
                                                                      , Just LoadedPkgInfo
    pkg <- [PkgsLoaded -> UnitId -> Maybe LoadedPkgInfo
    forall key elt.
    Uniquable key =>
    UniqDFM key elt -> key -> Maybe elt
    lookupUDFM PkgsLoaded
    all_pkgs_loaded UnitId
    pkg_id]
                                                                      ])
       (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls2, SuccessFlag
    succ, [Linkable]
    all_lnks, PkgsLoaded
    this_pkgs_loaded)

    -- | Temporarily extend the loaded env.
    withExtendedLoadedEnv
      :: (ExceptionMonad m)
      => Interp
      -> [(Name,ForeignHValue)]
      -> m a
      -> m a
    withExtendedLoadedEnv :: forall (m :: * -> *) a.
    ExceptionMonad m =>
    Interp -> [(Name, ForeignHValue)] -> m a -> m a
    withExtendedLoadedEnv Interp
    interp [(Name, ForeignHValue)]
    new_env m a
    action
        = m () -> (() -> m ()) -> (() -> m a) -> m a
    forall (m :: * -> *) a c b.
    MonadMask m =>
    m a -> (a -> m c) -> (a -> m b) -> m b
    MC.bracket (IO () -> m ()
    forall a. IO a -> m a
    forall (m :: * -> *) a. MonadIO m => IO a -> m a
    liftIO (IO () -> m ()) -> IO () -> m ()
    forall a b. (a -> b) -> a -> b
    $ Interp -> [(Name, ForeignHValue)] -> IO ()
    extendLoadedEnv Interp
    interp [(Name, ForeignHValue)]
    new_env)
                   (\()
    _ -> m ()
    reset_old_env)
                   (\()
    _ -> m a
    action)
        where
            -- Remember that the linker state might be side-effected
            -- during the execution of the IO action, and we don't want to
            -- lose those changes (we might have linked a new module or
            -- package), so the reset action only removes the names we
            -- added earlier.
              reset_old_env :: m ()
    reset_old_env = IO () -> m ()
    forall a. IO a -> m a
    forall (m :: * -> *) a. MonadIO m => IO a -> m a
    liftIO (IO () -> m ()) -> IO () -> m ()
    forall a b. (a -> b) -> a -> b
    $
                Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp ((LoaderState -> IO LoaderState) -> IO ())
    -> (LoaderState -> IO LoaderState) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls ->
                    let cur :: ClosureEnv
    cur = LoaderState -> ClosureEnv
    closure_env LoaderState
    pls
                        new :: ClosureEnv
    new = ClosureEnv -> [Name] -> ClosureEnv
    forall a. NameEnv a -> [Name] -> NameEnv a
    delListFromNameEnv ClosureEnv
    cur (((Name, ForeignHValue) -> Name)
    -> [(Name, ForeignHValue)] -> [Name]
    forall a b. (a -> b) -> [a] -> [b]
    map (Name, ForeignHValue) -> Name
    forall a b. (a, b) -> a
    fst [(Name, ForeignHValue)]
    new_env)
                    in LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls{ closure_env :: ClosureEnv
    closure_env = ClosureEnv
    new }

    -- | Display the loader state.
    showLoaderState :: Interp -> IO SDoc
    showLoaderState :: Interp -> IO SDoc
    showLoaderState Interp
    interp = do
      Maybe LoaderState
    ls <- MVar (Maybe LoaderState) -> IO (Maybe LoaderState)
    forall a. MVar a -> IO a
    readMVar (Loader -> MVar (Maybe LoaderState)
    loader_state (Interp -> Loader
    interpLoader Interp
    interp))
      let docs :: [SDoc]
    docs = case Maybe LoaderState
    ls of
            Maybe LoaderState
    Nothing  -> [ String -> SDoc
    text String
    "Loader not initialised"]
            Just LoaderState
    pls -> [ String -> SDoc
    text String
    "Pkgs:" SDoc -> SDoc -> SDoc
    <+> [UnitId] -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr ((LoadedPkgInfo -> UnitId) -> [LoadedPkgInfo] -> [UnitId]
    forall a b. (a -> b) -> [a] -> [b]
    map LoadedPkgInfo -> UnitId
    loaded_pkg_uid ([LoadedPkgInfo] -> [UnitId]) -> [LoadedPkgInfo] -> [UnitId]
    forall a b. (a -> b) -> a -> b
    $ PkgsLoaded -> [LoadedPkgInfo]
    forall key elt. UniqDFM key elt -> [elt]
    eltsUDFM (PkgsLoaded -> [LoadedPkgInfo]) -> PkgsLoaded -> [LoadedPkgInfo]
    forall a b. (a -> b) -> a -> b
    $ LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls)
                        , String -> SDoc
    text String
    "Objs:" SDoc -> SDoc -> SDoc
    <+> [Linkable] -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LinkableSet -> [Linkable]
    forall a. ModuleEnv a -> [a]
    moduleEnvElts (LinkableSet -> [Linkable]) -> LinkableSet -> [Linkable]
    forall a b. (a -> b) -> a -> b
    $ LoaderState -> LinkableSet
    objs_loaded LoaderState
    pls)
                        , String -> SDoc
    text String
    "BCOs:" SDoc -> SDoc -> SDoc
    <+> [Linkable] -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LinkableSet -> [Linkable]
    forall a. ModuleEnv a -> [a]
    moduleEnvElts (LinkableSet -> [Linkable]) -> LinkableSet -> [Linkable]
    forall a b. (a -> b) -> a -> b
    $ LoaderState -> LinkableSet
    bcos_loaded LoaderState
    pls)
                        ]

      SDoc -> IO SDoc
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (SDoc -> IO SDoc) -> SDoc -> IO SDoc
    forall a b. (a -> b) -> a -> b
    $ PprStyle -> SDoc -> SDoc
    withPprStyle PprStyle
    defaultDumpStyle
             (SDoc -> SDoc) -> SDoc -> SDoc
    forall a b. (a -> b) -> a -> b
    $ [SDoc] -> SDoc
    vcat (String -> SDoc
    text String
    "----- Loader state -----"SDoc -> [SDoc] -> [SDoc]
    forall a. a -> [a] -> [a]
    :[SDoc]
    docs)

    {- **********************************************************************

                            Initialisation

      ********************************************************************* -}

    -- | Initialise the dynamic linker.  This entails
    --
    --  a) Calling the C initialisation procedure,
    --
    --  b) Loading any packages specified on the command line,
    --
    --  c) Loading any packages specified on the command line, now held in the
    --     @-l@ options in @v_Opt_l@,
    --
    --  d) Loading any @.o\/.dll@ files specified on the command line, now held
    --     in @ldInputs@,
    --
    --  e) Loading any MacOS frameworks.
    --
    -- NOTE: This function is idempotent; if called more than once, it does
    -- nothing.  This is useful in Template Haskell, where we call it before
    -- trying to link.
    --
    initLoaderState :: Interp -> HscEnv -> IO ()
    initLoaderState :: Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env = do
      MVar (Maybe LoaderState)
    -> (Maybe LoaderState -> IO (Maybe LoaderState)) -> IO ()
    forall a. MVar a -> (a -> IO a) -> IO ()
    modifyMVar_ (Loader -> MVar (Maybe LoaderState)
    loader_state (Interp -> Loader
    interpLoader Interp
    interp)) ((Maybe LoaderState -> IO (Maybe LoaderState)) -> IO ())
    -> (Maybe LoaderState -> IO (Maybe LoaderState)) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \Maybe LoaderState
    pls -> do
        case Maybe LoaderState
    pls of
          Just  LoaderState
    _ -> Maybe LoaderState -> IO (Maybe LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe LoaderState
    pls
          Maybe LoaderState
    Nothing -> LoaderState -> Maybe LoaderState
    forall a. a -> Maybe a
    Just (LoaderState -> Maybe LoaderState)
    -> IO LoaderState -> IO (Maybe LoaderState)
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> Interp -> HscEnv -> IO LoaderState
    reallyInitLoaderState Interp
    interp HscEnv
    hsc_env

    reallyInitLoaderState :: Interp -> HscEnv -> IO LoaderState
    reallyInitLoaderState :: Interp -> HscEnv -> IO LoaderState
    reallyInitLoaderState Interp
    interp HscEnv
    hsc_env = do
      -- Initialise the linker state
      let pls0 :: LoaderState
    pls0 = LoaderState
    emptyLoaderState

      -- (a) initialise the C dynamic linker
      Interp -> IO ()
    initObjLinker Interp
    interp

      -- (b) Load packages from the command-line (Note [preload packages])
      LoaderState
    pls <- (IO LoaderState -> UnitId -> HomeUnitEnv -> IO LoaderState)
    -> IO LoaderState -> UnitEnvGraph HomeUnitEnv -> IO LoaderState
    forall b a. (b -> UnitId -> a -> b) -> b -> UnitEnvGraph a -> b
    unitEnv_foldWithKey (\IO LoaderState
    k UnitId
    u HomeUnitEnv
    env -> IO LoaderState
    k IO LoaderState -> (LoaderState -> IO LoaderState) -> IO LoaderState
    forall a b. IO a -> (a -> IO b) -> IO b
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= \LoaderState
    pls' -> Interp -> HscEnv -> [UnitId] -> LoaderState -> IO LoaderState
    loadPackages' Interp
    interp ((() :: Constraint) => UnitId -> HscEnv -> HscEnv
    UnitId -> HscEnv -> HscEnv
    hscSetActiveUnitId UnitId
    u HscEnv
    hsc_env) (UnitState -> [UnitId]
    preloadUnits (HomeUnitEnv -> UnitState
    homeUnitEnv_units HomeUnitEnv
    env)) LoaderState
    pls') (LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls0) (HscEnv -> UnitEnvGraph HomeUnitEnv
    hsc_HUG HscEnv
    hsc_env)

      -- steps (c), (d) and (e)
      Interp -> HscEnv -> LoaderState -> IO LoaderState
    loadCmdLineLibs' Interp
    interp HscEnv
    hsc_env LoaderState
    pls

    loadCmdLineLibs :: Interp -> HscEnv -> IO ()
    loadCmdLineLibs :: Interp -> HscEnv -> IO ()
    loadCmdLineLibs Interp
    interp HscEnv
    hsc_env = do
      Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env
      Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp ((LoaderState -> IO LoaderState) -> IO ())
    -> (LoaderState -> IO LoaderState) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls ->
        Interp -> HscEnv -> LoaderState -> IO LoaderState
    loadCmdLineLibs' Interp
    interp HscEnv
    hsc_env LoaderState
    pls

    loadCmdLineLibs' :: Interp -> HscEnv -> LoaderState -> IO LoaderState
    loadCmdLineLibs' :: Interp -> HscEnv -> LoaderState -> IO LoaderState
    loadCmdLineLibs' Interp
    interp HscEnv
    hsc_env LoaderState
    pls = (Set UnitId, LoaderState) -> LoaderState
    forall a b. (a, b) -> b
    snd ((Set UnitId, LoaderState) -> LoaderState)
    -> IO (Set UnitId, LoaderState) -> IO LoaderState
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$>
        ((Set UnitId, LoaderState)
     -> UnitId -> IO (Set UnitId, LoaderState))
    -> (Set UnitId, LoaderState)
    -> Set UnitId
    -> IO (Set UnitId, LoaderState)
    forall (t :: * -> *) (m :: * -> *) b a.
    (Foldable t, Monad m) =>
    (b -> a -> m b) -> b -> t a -> m b
    foldM
          (\(Set UnitId
    done', LoaderState
    pls') UnitId
    cur_uid ->  Set UnitId -> UnitId -> LoaderState -> IO (Set UnitId, LoaderState)
    load Set UnitId
    done' UnitId
    cur_uid LoaderState
    pls')
          (Set UnitId
    forall a. Set a
    Set.empty, LoaderState
    pls)
          (HscEnv -> Set UnitId
    hsc_all_home_unit_ids HscEnv
    hsc_env)

      where
        load :: Set.Set UnitId -> UnitId -> LoaderState -> IO (Set.Set UnitId, LoaderState)
        load :: Set UnitId -> UnitId -> LoaderState -> IO (Set UnitId, LoaderState)
    load Set UnitId
    done UnitId
    uid LoaderState
    pls | UnitId
    uid UnitId -> Set UnitId -> Bool
    forall a. Ord a => a -> Set a -> Bool
    `Set.member` Set UnitId
    done = (Set UnitId, LoaderState) -> IO (Set UnitId, LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Set UnitId
    done, LoaderState
    pls)
        load Set UnitId
    done UnitId
    uid LoaderState
    pls = do
          let hsc' :: HscEnv
    hsc' = (() :: Constraint) => UnitId -> HscEnv -> HscEnv
    UnitId -> HscEnv -> HscEnv
    hscSetActiveUnitId UnitId
    uid HscEnv
    hsc_env
          -- Load potential dependencies first
          (Set UnitId
    done', LoaderState
    pls') <- ((Set UnitId, LoaderState)
     -> UnitId -> IO (Set UnitId, LoaderState))
    -> (Set UnitId, LoaderState)
    -> [UnitId]
    -> IO (Set UnitId, LoaderState)
    forall (t :: * -> *) (m :: * -> *) b a.
    (Foldable t, Monad m) =>
    (b -> a -> m b) -> b -> t a -> m b
    foldM (\(Set UnitId
    done', LoaderState
    pls') UnitId
    uid -> Set UnitId -> UnitId -> LoaderState -> IO (Set UnitId, LoaderState)
    load Set UnitId
    done' UnitId
    uid LoaderState
    pls') (Set UnitId
    done, LoaderState
    pls)
                              (UnitState -> [UnitId]
    homeUnitDepends ((() :: Constraint) => HscEnv -> UnitState
    HscEnv -> UnitState
    hsc_units HscEnv
    hsc'))
          LoaderState
    pls'' <- Interp -> HscEnv -> LoaderState -> IO LoaderState
    loadCmdLineLibs'' Interp
    interp HscEnv
    hsc' LoaderState
    pls'
          (Set UnitId, LoaderState) -> IO (Set UnitId, LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ((Set UnitId, LoaderState) -> IO (Set UnitId, LoaderState))
    -> (Set UnitId, LoaderState) -> IO (Set UnitId, LoaderState)
    forall a b. (a -> b) -> a -> b
    $ (UnitId -> Set UnitId -> Set UnitId
    forall a. Ord a => a -> Set a -> Set a
    Set.insert UnitId
    uid Set UnitId
    done', LoaderState
    pls'')

    loadCmdLineLibs''
      :: Interp
      -> HscEnv
      -> LoaderState
      -> IO LoaderState
    loadCmdLineLibs'' :: Interp -> HscEnv -> LoaderState -> IO LoaderState
    loadCmdLineLibs'' Interp
    interp HscEnv
    hsc_env LoaderState
    pls =
      do

          let dflags :: DynFlags
    dflags@(DynFlags { ldInputs :: DynFlags -> [Option]
    ldInputs = [Option]
    cmdline_ld_inputs
                               , libraryPaths :: DynFlags -> [String]
    libraryPaths = [String]
    lib_paths_base})
                = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
          let logger :: Logger
    logger = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env

          -- (c) Link libraries from the command-line
          let minus_ls_1 :: [String]
    minus_ls_1 = [ String
    lib | Option (Char
    '-':Char
    'l':String
    lib) <- [Option]
    cmdline_ld_inputs ]

          -- On Windows we want to add libpthread by default just as GCC would.
          -- However because we don't know the actual name of pthread's dll we
          -- need to defer this to the locateLib call so we can't initialize it
          -- inside of the rts. Instead we do it here to be able to find the
          -- import library for pthreads. See #13210.
          let platform :: Platform
    platform = DynFlags -> Platform
    targetPlatform DynFlags
    dflags
              os :: OS
    os       = Platform -> OS
    platformOS Platform
    platform
              minus_ls :: [String]
    minus_ls = case OS
    os of
                           OS
    OSMinGW32 -> String
    "pthread" String -> [String] -> [String]
    forall a. a -> [a] -> [a]
    : [String]
    minus_ls_1
                           OS
    _         -> [String]
    minus_ls_1
          -- See Note [Fork/Exec Windows]
          [String]
    gcc_paths <- Logger -> DynFlags -> OS -> IO [String]
    getGCCPaths Logger
    logger DynFlags
    dflags OS
    os

          [String]
    lib_paths_env <- String -> [String] -> IO [String]
    addEnvPaths String
    "LIBRARY_PATH" [String]
    lib_paths_base

          Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "Search directories (user):"
          Logger -> String -> IO ()
    maybePutStr Logger
    logger ([String] -> String
    unlines ([String] -> String) -> [String] -> String
    forall a b. (a -> b) -> a -> b
    $ (String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map (String
    "  "String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++) [String]
    lib_paths_env)
          Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "Search directories (gcc):"
          Logger -> String -> IO ()
    maybePutStr Logger
    logger ([String] -> String
    unlines ([String] -> String) -> [String] -> String
    forall a b. (a -> b) -> a -> b
    $ (String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map (String
    "  "String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++) [String]
    gcc_paths)

          [LibrarySpec]
    libspecs
            <- (String -> IO LibrarySpec) -> [String] -> IO [LibrarySpec]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (Interp
    -> HscEnv
    -> Bool
    -> [String]
    -> [String]
    -> String
    -> IO LibrarySpec
    locateLib Interp
    interp HscEnv
    hsc_env Bool
    False [String]
    lib_paths_env [String]
    gcc_paths) [String]
    minus_ls

          -- (d) Link .o files from the command-line
          [Maybe LibrarySpec]
    classified_ld_inputs <- (String -> IO (Maybe LibrarySpec))
    -> [String] -> IO [Maybe LibrarySpec]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (Logger -> Platform -> String -> IO (Maybe LibrarySpec)
    classifyLdInput Logger
    logger Platform
    platform)
                                    [ String
    f | FileOption String
    _ String
    f <- [Option]
    cmdline_ld_inputs ]

          -- (e) Link any MacOS frameworks
          let platform :: Platform
    platform = DynFlags -> Platform
    targetPlatform DynFlags
    dflags
          let ([String]
    framework_paths, [String]
    frameworks) =
                if Platform -> Bool
    platformUsesFrameworks Platform
    platform
                 then (DynFlags -> [String]
    frameworkPaths DynFlags
    dflags, DynFlags -> [String]
    cmdlineFrameworks DynFlags
    dflags)
                  else ([],[])

          -- Finally do (c),(d),(e)
          let cmdline_lib_specs :: [LibrarySpec]
    cmdline_lib_specs = [Maybe LibrarySpec] -> [LibrarySpec]
    forall a. [Maybe a] -> [a]
    catMaybes [Maybe LibrarySpec]
    classified_ld_inputs
                               [LibrarySpec] -> [LibrarySpec] -> [LibrarySpec]
    forall a. [a] -> [a] -> [a]
    ++ [LibrarySpec]
    libspecs
                               [LibrarySpec] -> [LibrarySpec] -> [LibrarySpec]
    forall a. [a] -> [a] -> [a]
    ++ (String -> LibrarySpec) -> [String] -> [LibrarySpec]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> LibrarySpec
    Framework [String]
    frameworks
          if [LibrarySpec] -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [LibrarySpec]
    cmdline_lib_specs
             then LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls
             else do
               -- Add directories to library search paths, this only has an effect
               -- on Windows. On Unix OSes this function is a NOP.
               let all_paths :: [String]
    all_paths = let paths :: [String]
    paths = String -> String
    takeDirectory (DynFlags -> String
    pgm_c DynFlags
    dflags)
                                         String -> [String] -> [String]
    forall a. a -> [a] -> [a]
    : [String]
    framework_paths
                                        [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    lib_paths_base
                                        [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [ String -> String
    takeDirectory String
    dll | DLLPath String
    dll <- [LibrarySpec]
    libspecs ]
                               in [String] -> [String]
    forall a. Eq a => [a] -> [a]
    nub ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ (String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> String
    normalise [String]
    paths
               let lib_paths :: [String]
    lib_paths = [String] -> [String]
    forall a. Eq a => [a] -> [a]
    nub ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ [String]
    lib_paths_base [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    gcc_paths
               [String]
    all_paths_env <- String -> [String] -> IO [String]
    addEnvPaths String
    "LD_LIBRARY_PATH" [String]
    all_paths
               [Ptr ()]
    pathCache <- (String -> IO (Ptr ())) -> [String] -> IO [Ptr ()]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (Interp -> String -> IO (Ptr ())
    addLibrarySearchPath Interp
    interp) [String]
    all_paths_env

               let merged_specs :: [LibrarySpec]
    merged_specs = [LibrarySpec] -> [LibrarySpec]
    mergeStaticObjects [LibrarySpec]
    cmdline_lib_specs
               LoaderState
    pls1 <- (LoaderState -> LibrarySpec -> IO LoaderState)
    -> LoaderState -> [LibrarySpec] -> IO LoaderState
    forall (t :: * -> *) (m :: * -> *) b a.
    (Foldable t, Monad m) =>
    (b -> a -> m b) -> b -> t a -> m b
    foldM (Interp
    -> HscEnv
    -> [String]
    -> [String]
    -> LoaderState
    -> LibrarySpec
    -> IO LoaderState
    preloadLib Interp
    interp HscEnv
    hsc_env [String]
    lib_paths [String]
    framework_paths) LoaderState
    pls
                             [LibrarySpec]
    merged_specs

               Logger -> String -> IO ()
    maybePutStr Logger
    logger String
    "final link ... "
               SuccessFlag
    ok <- Interp -> IO SuccessFlag
    resolveObjs Interp
    interp

               -- DLLs are loaded, reset the search paths
               (Ptr () -> IO Bool) -> [Ptr ()] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> Ptr () -> IO Bool
    removeLibrarySearchPath Interp
    interp) ([Ptr ()] -> IO ()) -> [Ptr ()] -> IO ()
    forall a b. (a -> b) -> a -> b
    $ [Ptr ()] -> [Ptr ()]
    forall a. [a] -> [a]
    reverse [Ptr ()]
    pathCache

               if SuccessFlag -> Bool
    succeeded SuccessFlag
    ok then Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
               else GhcException -> IO ()
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError String
    "linking extra libraries/objects failed")

               LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls1

    -- | Merge runs of consecutive of 'Objects'. This allows for resolution of
    -- cyclic symbol references when dynamically linking. Specifically, we link
    -- together all of the static objects into a single shared object, avoiding
    -- the issue we saw in #13786.
    mergeStaticObjects :: [LibrarySpec] -> [LibrarySpec]
    mergeStaticObjects :: [LibrarySpec] -> [LibrarySpec]
    mergeStaticObjects [LibrarySpec]
    specs = [String] -> [LibrarySpec] -> [LibrarySpec]
    go [] [LibrarySpec]
    specs
      where
        go :: [FilePath] -> [LibrarySpec] -> [LibrarySpec]
        go :: [String] -> [LibrarySpec] -> [LibrarySpec]
    go [String]
    accum (Objects [String]
    objs : [LibrarySpec]
    rest) = [String] -> [LibrarySpec] -> [LibrarySpec]
    go ([String]
    objs [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    accum) [LibrarySpec]
    rest
        go accum :: [String]
    accum@(String
    _:[String]
    _) [LibrarySpec]
    rest = [String] -> LibrarySpec
    Objects ([String] -> [String]
    forall a. [a] -> [a]
    reverse [String]
    accum) LibrarySpec -> [LibrarySpec] -> [LibrarySpec]
    forall a. a -> [a] -> [a]
    : [String] -> [LibrarySpec] -> [LibrarySpec]
    go [] [LibrarySpec]
    rest
        go [] (LibrarySpec
    spec:[LibrarySpec]
    rest) = LibrarySpec
    spec LibrarySpec -> [LibrarySpec] -> [LibrarySpec]
    forall a. a -> [a] -> [a]
    : [String] -> [LibrarySpec] -> [LibrarySpec]
    go [] [LibrarySpec]
    rest
        go [] [] = []

    {- Note [preload packages]
       ~~~~~~~~~~~~~~~~~~~~~~~
    Why do we need to preload packages from the command line?  This is an
    explanation copied from #2437:

    I tried to implement the suggestion from #3560, thinking it would be
    easy, but there are two reasons we link in packages eagerly when they
    are mentioned on the command line:

      * So that you can link in extra object files or libraries that
        depend on the packages. e.g. ghc -package foo -lbar where bar is a
        C library that depends on something in foo. So we could link in
        foo eagerly if and only if there are extra C libs or objects to
        link in, but....

      * Haskell code can depend on a C function exported by a package, and
        the normal dependency tracking that TH uses can't know about these
        dependencies. The test ghcilink004 relies on this, for example.

    I conclude that we need two -package flags: one that says "this is a
    package I want to make available", and one that says "this is a
    package I want to link in eagerly". Would that be too complicated for
    users?
    -}

    classifyLdInput :: Logger -> Platform -> FilePath -> IO (Maybe LibrarySpec)
    classifyLdInput :: Logger -> Platform -> String -> IO (Maybe LibrarySpec)
    classifyLdInput Logger
    logger Platform
    platform String
    f
      | Platform -> String -> Bool
    isObjectFilename Platform
    platform String
    f = Maybe LibrarySpec -> IO (Maybe LibrarySpec)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LibrarySpec -> Maybe LibrarySpec
    forall a. a -> Maybe a
    Just ([String] -> LibrarySpec
    Objects [String
    f]))
      | Platform -> String -> Bool
    isDynLibFilename Platform
    platform String
    f = Maybe LibrarySpec -> IO (Maybe LibrarySpec)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LibrarySpec -> Maybe LibrarySpec
    forall a. a -> Maybe a
    Just (String -> LibrarySpec
    DLLPath String
    f))
      | Bool
    otherwise          = do
            Logger -> MessageClass -> SrcSpan -> SDoc -> IO ()
    logMsg Logger
    logger MessageClass
    MCInfo SrcSpan
    noSrcSpan
                (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $ PprStyle -> SDoc -> SDoc
    withPprStyle PprStyle
    defaultUserStyle
                (String -> SDoc
    text (String
    "Warning: ignoring unrecognised input `" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    f String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    "'"))
            Maybe LibrarySpec -> IO (Maybe LibrarySpec)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe LibrarySpec
    forall a. Maybe a
    Nothing

    preloadLib
      :: Interp
      -> HscEnv
      -> [String]
      -> [String]
      -> LoaderState
      -> LibrarySpec
      -> IO LoaderState
    preloadLib :: Interp
    -> HscEnv
    -> [String]
    -> [String]
    -> LoaderState
    -> LibrarySpec
    -> IO LoaderState
    preloadLib Interp
    interp HscEnv
    hsc_env [String]
    lib_paths [String]
    framework_paths LoaderState
    pls LibrarySpec
    lib_spec = do
      Logger -> String -> IO ()
    maybePutStr Logger
    logger (String
    "Loading object " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ LibrarySpec -> String
    showLS LibrarySpec
    lib_spec String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    " ... ")
      case LibrarySpec
    lib_spec of
        Objects [String]
    static_ishs -> do
          (Bool
    b, LoaderState
    pls1) <- [String] -> [String] -> IO (Bool, LoaderState)
    preload_statics [String]
    lib_paths [String]
    static_ishs
          Logger -> String -> IO ()
    maybePutStrLn Logger
    logger (if Bool
    b  then String
    "done" else String
    "not found")
          LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls1

        Archive String
    static_ish -> do
          Bool
    b <- [String] -> String -> IO Bool
    preload_static_archive [String]
    lib_paths String
    static_ish
          Logger -> String -> IO ()
    maybePutStrLn Logger
    logger (if Bool
    b  then String
    "done" else String
    "not found")
          LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls

        DLL String
    dll_unadorned -> do
          Maybe String
    maybe_errstr <- Interp -> String -> IO (Maybe String)
    loadDLL Interp
    interp (Platform -> String -> String
    platformSOName Platform
    platform String
    dll_unadorned)
          case Maybe String
    maybe_errstr of
             Maybe String
    Nothing -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
             Just String
    mm | Platform -> OS
    platformOS Platform
    platform OS -> OS -> Bool
    forall a. Eq a => a -> a -> Bool
    /= OS
    OSDarwin ->
               String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    mm [String]
    lib_paths LibrarySpec
    lib_spec
             Just String
    mm | Bool
    otherwise -> do
               -- As a backup, on Darwin, try to also load a .so file
               -- since (apparently) some things install that way - see
               -- ticket #8770.
               let libfile :: String
    libfile = (String
    "lib" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    dll_unadorned) String -> String -> String
    <.> String
    "so"
               Maybe String
    err2 <- Interp -> String -> IO (Maybe String)
    loadDLL Interp
    interp String
    libfile
               case Maybe String
    err2 of
                 Maybe String
    Nothing -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
                 Just String
    _  -> String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    mm [String]
    lib_paths LibrarySpec
    lib_spec
          LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls

        DLLPath String
    dll_path -> do
          do Maybe String
    maybe_errstr <- Interp -> String -> IO (Maybe String)
    loadDLL Interp
    interp String
    dll_path
             case Maybe String
    maybe_errstr of
                Maybe String
    Nothing -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
                Just String
    mm -> String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    mm [String]
    lib_paths LibrarySpec
    lib_spec
             LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls

        Framework String
    framework ->
          if Platform -> Bool
    platformUsesFrameworks (DynFlags -> Platform
    targetPlatform DynFlags
    dflags)
          then do Maybe String
    maybe_errstr <- Interp -> [String] -> String -> IO (Maybe String)
    loadFramework Interp
    interp [String]
    framework_paths String
    framework
                  case Maybe String
    maybe_errstr of
                     Maybe String
    Nothing -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
                     Just String
    mm -> String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    mm [String]
    framework_paths LibrarySpec
    lib_spec
                  LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls
          else GhcException -> IO LoaderState
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError String
    "preloadLib Framework")

      where
        dflags :: DynFlags
    dflags = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
        logger :: Logger
    logger = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env

        platform :: Platform
    platform = DynFlags -> Platform
    targetPlatform DynFlags
    dflags

        preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
        preloadFailed :: String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    sys_errmsg [String]
    paths LibrarySpec
    spec
           = do Logger -> String -> IO ()
    maybePutStr Logger
    logger String
    "failed.\n"
                GhcException -> IO ()
    forall a. GhcException -> IO a
    throwGhcExceptionIO (GhcException -> IO ()) -> GhcException -> IO ()
    forall a b. (a -> b) -> a -> b
    $
                  String -> GhcException
    CmdLineError (
                        String
    "user specified .o/.so/.DLL could not be loaded ("
                        String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    sys_errmsg String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    ")\nWhilst trying to load:  "
                        String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ LibrarySpec -> String
    showLS LibrarySpec
    spec String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    "\nAdditional directories searched:"
                        String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ (if [String] -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [String]
    paths then String
    " (none)" else
                            String -> [String] -> String
    forall a. [a] -> [[a]] -> [a]
    intercalate String
    "\n" ((String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map (String
    "   "String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++) [String]
    paths)))

        -- Not interested in the paths in the static case.
        preload_statics :: [String] -> [String] -> IO (Bool, LoaderState)
    preload_statics [String]
    _paths [String]
    names
           = do Bool
    b <- [Bool] -> Bool
    forall (t :: * -> *). Foldable t => t Bool -> Bool
    or ([Bool] -> Bool) -> IO [Bool] -> IO Bool
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> (String -> IO Bool) -> [String] -> IO [Bool]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM String -> IO Bool
    doesFileExist [String]
    names
                if Bool -> Bool
    not Bool
    b then (Bool, LoaderState) -> IO (Bool, LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Bool
    False, LoaderState
    pls)
                         else if Bool
    hostIsDynamic
                                 then  do LoaderState
    pls1 <- Interp -> HscEnv -> LoaderState -> [String] -> IO LoaderState
    dynLoadObjs Interp
    interp HscEnv
    hsc_env LoaderState
    pls [String]
    names
                                          (Bool, LoaderState) -> IO (Bool, LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Bool
    True, LoaderState
    pls1)
                                 else  do (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> String -> IO ()
    loadObj Interp
    interp) [String]
    names
                                          (Bool, LoaderState) -> IO (Bool, LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Bool
    True, LoaderState
    pls)

        preload_static_archive :: [String] -> String -> IO Bool
    preload_static_archive [String]
    _paths String
    name
           = do Bool
    b <- String -> IO Bool
    doesFileExist String
    name
                if Bool -> Bool
    not Bool
    b then Bool -> IO Bool
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    False
                         else do if Bool
    hostIsDynamic
                                     then GhcException -> IO ()
    forall a. GhcException -> IO a
    throwGhcExceptionIO (GhcException -> IO ()) -> GhcException -> IO ()
    forall a b. (a -> b) -> a -> b
    $
                                          String -> GhcException
    CmdLineError String
    dynamic_msg
                                     else Interp -> String -> IO ()
    loadArchive Interp
    interp String
    name
                                 Bool -> IO Bool
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Bool
    True
          where
            dynamic_msg :: String
    dynamic_msg = [String] -> String
    unlines
              [ String
    "User-specified static library could not be loaded ("
                String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    name String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    ")"
              , String
    "Loading static libraries is not supported in this configuration."
              , String
    "Try using a dynamic library instead."
              ]

    {- **********************************************************************

                            Link a byte-code expression

      ********************************************************************* -}

    -- | Load a single expression, /including/ first loading packages and
    -- modules that this expression depends on.
    --
    -- Raises an IO exception ('ProgramError') if it can't find a compiled
    -- version of the dependents to load.
    --
    loadExpr :: Interp -> HscEnv -> SrcSpan -> UnlinkedBCO -> IO ForeignHValue
    loadExpr :: Interp -> HscEnv -> SrcSpan -> UnlinkedBCO -> IO ForeignHValue
    loadExpr Interp
    interp HscEnv
    hsc_env SrcSpan
    span UnlinkedBCO
    root_ul_bco = do
      -- Initialise the linker (if it's not been done already)
      Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env

      -- Take lock for the actual work.
      Interp
    -> (LoaderState -> IO (LoaderState, ForeignHValue))
    -> IO ForeignHValue
    forall a. Interp -> (LoaderState -> IO (LoaderState, a)) -> IO a
    modifyLoaderState Interp
    interp ((LoaderState -> IO (LoaderState, ForeignHValue))
     -> IO ForeignHValue)
    -> (LoaderState -> IO (LoaderState, ForeignHValue))
    -> IO ForeignHValue
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls0 -> do
        -- Load the packages and modules required
        (LoaderState
    pls, SuccessFlag
    ok, [Linkable]
    _, PkgsLoaded
    _) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls0 SrcSpan
    span [Module]
    needed_mods
        if SuccessFlag -> Bool
    failed SuccessFlag
    ok
          then GhcException -> IO (LoaderState, ForeignHValue)
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError String
    "")
          else do
            -- Load the expression itself
            let ie :: ItblEnv
    ie = LoaderState -> ItblEnv
    itbl_env LoaderState
    pls
                ce :: ClosureEnv
    ce = LoaderState -> ClosureEnv
    closure_env LoaderState
    pls

            -- Load the necessary packages and linkables
            let nobreakarray :: a
    nobreakarray = String -> a
    forall a. HasCallStack => String -> a
    error String
    "no break array"
                bco_ix :: NameEnv Int
    bco_ix = [(Name, Int)] -> NameEnv Int
    forall a. [(Name, a)] -> NameEnv a
    mkNameEnv [(UnlinkedBCO -> Name
    unlinkedBCOName UnlinkedBCO
    root_ul_bco, Int
    0)]
            ResolvedBCO
    resolved <- Interp
    -> ItblEnv
    -> ClosureEnv
    -> NameEnv Int
    -> RemoteRef BreakArray
    -> UnlinkedBCO
    -> IO ResolvedBCO
    linkBCO Interp
    interp ItblEnv
    ie ClosureEnv
    ce NameEnv Int
    bco_ix RemoteRef BreakArray
    forall a. a
    nobreakarray UnlinkedBCO
    root_ul_bco
            BCOOpts
    bco_opts <- DynFlags -> IO BCOOpts
    initBCOOpts (HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env)
            [HValueRef
    root_hvref] <- Interp -> BCOOpts -> [ResolvedBCO] -> IO [HValueRef]
    createBCOs Interp
    interp BCOOpts
    bco_opts [ResolvedBCO
    resolved]
            ForeignHValue
    fhv <- Interp -> HValueRef -> IO ForeignHValue
    forall a. Interp -> RemoteRef a -> IO (ForeignRef a)
    mkFinalizedHValue Interp
    interp HValueRef
    root_hvref
            (LoaderState, ForeignHValue) -> IO (LoaderState, ForeignHValue)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls, ForeignHValue
    fhv)
      where
         free_names :: [Name]
    free_names = UniqDSet Name -> [Name]
    forall a. UniqDSet a -> [a]
    uniqDSetToList (UnlinkedBCO -> UniqDSet Name
    bcoFreeNames UnlinkedBCO
    root_ul_bco)

         needed_mods :: [Module]
         needed_mods :: [Module]
    needed_mods = [ (() :: Constraint) => Name -> Module
    Name -> Module
    nameModule Name
    n | Name
    n <- [Name]
    free_names,
                         Name -> Bool
    isExternalName Name
    n,      -- Names from other modules
                         Bool -> Bool
    not (Name -> Bool
    isWiredInName Name
    n)  -- Exclude wired-in names
                       ]                        -- (see note below)
            -- Exclude wired-in names because we may not have read
            -- their interface files, so getLinkDeps will fail
            -- All wired-in names are in the base package, which we link
            -- by default, so we can safely ignore them here.

    dieWith :: DynFlags -> SrcSpan -> SDoc -> IO a
    dieWith :: forall a. DynFlags -> SrcSpan -> SDoc -> IO a
    dieWith DynFlags
    dflags SrcSpan
    span SDoc
    msg = GhcException -> IO a
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError (DynFlags -> SDoc -> String
    showSDoc DynFlags
    dflags (MessageClass -> SrcSpan -> SDoc -> SDoc
    mkLocMessage MessageClass
    MCFatal SrcSpan
    span SDoc
    msg)))

    checkNonStdWay :: DynFlags -> Interp -> SrcSpan -> IO (Maybe FilePath)
    checkNonStdWay :: DynFlags -> Interp -> SrcSpan -> IO (Maybe String)
    checkNonStdWay DynFlags
    _dflags Interp
    interp SrcSpan
    _srcspan
      | ExternalInterp {} <- Interp -> InterpInstance
    interpInstance Interp
    interp = Maybe String -> IO (Maybe String)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe String
    forall a. Maybe a
    Nothing
        -- with -fexternal-interpreter we load the .o files, whatever way
        -- they were built.  If they were built for a non-std way, then
        -- we will use the appropriate variant of the iserv binary to load them.

    -- #if-guard the following equations otherwise the pattern match checker will
    -- complain that they are redundant.
    #if defined(HAVE_INTERNAL_INTERPRETER)
    checkNonStdWay DynFlags
    dflags Interp
    _interp SrcSpan
    srcspan
      | Ways
    hostFullWays Ways -> Ways -> Bool
    forall a. Eq a => a -> a -> Bool
    == Ways
    targetFullWays = Maybe String -> IO (Maybe String)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe String
    forall a. Maybe a
    Nothing
        -- Only if we are compiling with the same ways as GHC is built
        -- with, can we dynamically load those object files. (see #3604)

      | DynFlags -> String
    objectSuf_ DynFlags
    dflags String -> String -> Bool
    forall a. Eq a => a -> a -> Bool
    == String
    normalObjectSuffix Bool -> Bool -> Bool
    && Bool -> Bool
    not (Ways -> Bool
    forall a. Set a -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null Ways
    targetFullWays)
      = DynFlags -> SrcSpan -> IO (Maybe String)
    failNonStd DynFlags
    dflags SrcSpan
    srcspan

      | Bool
    otherwise = Maybe String -> IO (Maybe String)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (String -> Maybe String
    forall a. a -> Maybe a
    Just (String
    hostWayTag String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    "o"))
      where
        targetFullWays :: Ways
    targetFullWays = Ways -> Ways
    fullWays (DynFlags -> Ways
    ways DynFlags
    dflags)
        hostWayTag :: String
    hostWayTag = case Ways -> String
    waysTag Ways
    hostFullWays of
                      String
    "" -> String
    ""
                      String
    tag -> String
    tag String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    "_"

        normalObjectSuffix :: String
        normalObjectSuffix :: String
    normalObjectSuffix = Phase -> String
    phaseInputExt Phase
    StopLn

    data Way' = Normal | Prof | Dyn

    failNonStd :: DynFlags -> SrcSpan -> IO (Maybe FilePath)
    failNonStd :: DynFlags -> SrcSpan -> IO (Maybe String)
    failNonStd DynFlags
    dflags SrcSpan
    srcspan = DynFlags -> SrcSpan -> SDoc -> IO (Maybe String)
    forall a. DynFlags -> SrcSpan -> SDoc -> IO a
    dieWith DynFlags
    dflags SrcSpan
    srcspan (SDoc -> IO (Maybe String)) -> SDoc -> IO (Maybe String)
    forall a b. (a -> b) -> a -> b
    $
      String -> SDoc
    text String
    "Cannot load" SDoc -> SDoc -> SDoc
    <+> Way' -> SDoc
    pprWay' Way'
    compWay SDoc -> SDoc -> SDoc
    <+>
         String -> SDoc
    text String
    "objects when GHC is built" SDoc -> SDoc -> SDoc
    <+> Way' -> SDoc
    pprWay' Way'
    ghciWay SDoc -> SDoc -> SDoc
    $$
      String -> SDoc
    text String
    "To fix this, either:" SDoc -> SDoc -> SDoc
    $$
      String -> SDoc
    text String
    "  (1) Use -fexternal-interpreter, or" SDoc -> SDoc -> SDoc
    $$
      SDoc
    buildTwiceMsg
        where compWay :: Way'
    compWay
                | DynFlags -> Ways
    ways DynFlags
    dflags Ways -> Way -> Bool
    `hasWay` Way
    WayDyn  = Way'
    Dyn
                | DynFlags -> Ways
    ways DynFlags
    dflags Ways -> Way -> Bool
    `hasWay` Way
    WayProf = Way'
    Prof
                | Bool
    otherwise = Way'
    Normal
              ghciWay :: Way'
    ghciWay
                | Bool
    hostIsDynamic = Way'
    Dyn
                | Bool
    hostIsProfiled = Way'
    Prof
                | Bool
    otherwise = Way'
    Normal
              buildTwiceMsg :: SDoc
    buildTwiceMsg = case (Way'
    ghciWay, Way'
    compWay) of
                (Way'
    Normal, Way'
    Dyn) -> SDoc
    dynamicTooMsg
                (Way'
    Dyn, Way'
    Normal) -> SDoc
    dynamicTooMsg
                (Way', Way')
    _ ->
                  String -> SDoc
    text String
    "  (2) Build the program twice: once" SDoc -> SDoc -> SDoc
    <+>
                    Way' -> SDoc
    pprWay' Way'
    ghciWay SDoc -> SDoc -> SDoc
    <> String -> SDoc
    text String
    ", and then" SDoc -> SDoc -> SDoc
    $$
                  String -> SDoc
    text String
    "      " SDoc -> SDoc -> SDoc
    <> Way' -> SDoc
    pprWay' Way'
    compWay SDoc -> SDoc -> SDoc
    <+>
                    String -> SDoc
    text String
    "using -osuf to set a different object file suffix."
              dynamicTooMsg :: SDoc
    dynamicTooMsg = String -> SDoc
    text String
    "  (2) Use -dynamic-too," SDoc -> SDoc -> SDoc
    <+>
                String -> SDoc
    text String
    "and use -osuf and -dynosuf to set object file suffixes as needed."
              pprWay' :: Way' -> SDoc
              pprWay' :: Way' -> SDoc
    pprWay' Way'
    way = String -> SDoc
    text (String -> SDoc) -> String -> SDoc
    forall a b. (a -> b) -> a -> b
    $ case Way'
    way of
                Way'
    Normal -> String
    "the normal way"
                Way'
    Prof -> String
    "with -prof"
                Way'
    Dyn -> String
    "with -dynamic"
    #endif

    getLinkDeps :: HscEnv
                -> LoaderState
                -> Maybe FilePath                   -- replace object suffixes?
                -> SrcSpan                          -- for error messages
                -> [Module]                         -- If you need these
                -> IO ([Linkable], [Linkable], [UnitId], UniqDSet UnitId)     -- ... then link these first
                -- The module and package dependencies for the needed modules are returned.
                -- See Note [Object File Dependencies]
    -- Fails with an IO exception if it can't find enough files

    getLinkDeps :: HscEnv
    -> LoaderState
    -> Maybe String
    -> SrcSpan
    -> [Module]
    -> IO ([Linkable], [Linkable], [UnitId], UniqDSet UnitId)
    getLinkDeps HscEnv
    hsc_env LoaderState
    pls Maybe String
    replace_osuf SrcSpan
    span [Module]
    mods
    -- Find all the packages and linkables that a set of modules depends on
     = do {
            -- 1.  Find the dependent home-pkg-modules/packages from each iface
            -- (omitting modules from the interactive package, which is already linked)
          ; ([Module]
    mods_s, UniqDSet UnitId
    pkgs_s) <-
              -- Why two code paths here? There is a significant amount of repeated work
              -- performed calculating transitive dependencies
              -- if --make uses the oneShot code path (see MultiLayerModulesTH_* tests)
              if GhcMode -> Bool
    isOneShot (DynFlags -> GhcMode
    ghcMode DynFlags
    dflags)
                then [Module]
    -> UniqDSet Module
    -> UniqDSet UnitId
    -> IO ([Module], UniqDSet UnitId)
    follow_deps ((Module -> Bool) -> [Module] -> [Module]
    forall a. (a -> Bool) -> [a] -> [a]
    filterOut Module -> Bool
    isInteractiveModule [Module]
    mods)
                                  UniqDSet Module
    forall a. UniqDSet a
    emptyUniqDSet UniqDSet UnitId
    forall a. UniqDSet a
    emptyUniqDSet;
                else do
                  ([UniqDSet UnitId]
    pkgs, [Maybe Module]
    mmods) <- [(UniqDSet UnitId, Maybe Module)]
    -> ([UniqDSet UnitId], [Maybe Module])
    forall a b. [(a, b)] -> ([a], [b])
    unzip ([(UniqDSet UnitId, Maybe Module)]
     -> ([UniqDSet UnitId], [Maybe Module]))
    -> IO [(UniqDSet UnitId, Maybe Module)]
    -> IO ([UniqDSet UnitId], [Maybe Module])
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> (ModNodeKeyWithUid -> IO (UniqDSet UnitId, Maybe Module))
    -> [ModNodeKeyWithUid] -> IO [(UniqDSet UnitId, Maybe Module)]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM ModNodeKeyWithUid -> IO (UniqDSet UnitId, Maybe Module)
    get_mod_info [ModNodeKeyWithUid]
    all_home_mods
                  ([Module], UniqDSet UnitId) -> IO ([Module], UniqDSet UnitId)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([Maybe Module] -> [Module]
    forall a. [Maybe a] -> [a]
    catMaybes [Maybe Module]
    mmods, [UniqDSet UnitId] -> UniqDSet UnitId
    forall a. [UniqDSet a] -> UniqDSet a
    unionManyUniqDSets (UniqDSet UnitId
    init_pkg_set UniqDSet UnitId -> [UniqDSet UnitId] -> [UniqDSet UnitId]
    forall a. a -> [a] -> [a]
    : [UniqDSet UnitId]
    pkgs))

          ; let
            -- 2.  Exclude ones already linked
            --      Main reason: avoid findModule calls in get_linkable
                ([Module]
    mods_needed, [Linkable]
    links_got) = [Either Module Linkable] -> ([Module], [Linkable])
    forall a b. [Either a b] -> ([a], [b])
    partitionEithers ((Module -> Either Module Linkable)
    -> [Module] -> [Either Module Linkable]
    forall a b. (a -> b) -> [a] -> [b]
    map Module -> Either Module Linkable
    split_mods [Module]
    mods_s)
                pkgs_needed :: [UnitId]
    pkgs_needed = UniqDFM UnitId UnitId -> [UnitId]
    forall key elt. UniqDFM key elt -> [elt]
    eltsUDFM (UniqDFM UnitId UnitId -> [UnitId])
    -> UniqDFM UnitId UnitId -> [UnitId]
    forall a b. (a -> b) -> a -> b
    $ UniqDSet UnitId -> UniqDFM UnitId UnitId
    forall a. UniqDSet a -> UniqDFM a a
    getUniqDSet UniqDSet UnitId
    pkgs_s UniqDFM UnitId UnitId -> PkgsLoaded -> UniqDFM UnitId UnitId
    forall key elt elt2.
    UniqDFM key elt -> UniqDFM key elt2 -> UniqDFM key elt
    `minusUDFM` LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls

                split_mods :: Module -> Either Module Linkable
    split_mods Module
    mod =
                    let is_linked :: Maybe Linkable
    is_linked = LinkableSet -> Module -> Maybe Linkable
    findModuleLinkable_maybe (LoaderState -> LinkableSet
    objs_loaded LoaderState
    pls) Module
    mod Maybe Linkable -> Maybe Linkable -> Maybe Linkable
    forall a. Maybe a -> Maybe a -> Maybe a
    forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
    <|> LinkableSet -> Module -> Maybe Linkable
    findModuleLinkable_maybe (LoaderState -> LinkableSet
    bcos_loaded LoaderState
    pls) Module
    mod
                    in case Maybe Linkable
    is_linked of
                         Just Linkable
    linkable -> Linkable -> Either Module Linkable
    forall a b. b -> Either a b
    Right Linkable
    linkable
                         Maybe Linkable
    Nothing -> Module -> Either Module Linkable
    forall a b. a -> Either a b
    Left Module
    mod

            -- 3.  For each dependent module, find its linkable
            --     This will either be in the HPT or (in the case of one-shot
            --     compilation) we may need to use maybe_getFileLinkable
          ; let { osuf :: String
    osuf = DynFlags -> String
    objectSuf DynFlags
    dflags }
          ; [Linkable]
    lnks_needed <- (Module -> IO Linkable) -> [Module] -> IO [Linkable]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (String -> Module -> IO Linkable
    get_linkable String
    osuf) [Module]
    mods_needed

          ; ([Linkable], [Linkable], [UnitId], UniqDSet UnitId)
    -> IO ([Linkable], [Linkable], [UnitId], UniqDSet UnitId)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([Linkable]
    lnks_needed, [Linkable]
    links_got [Linkable] -> [Linkable] -> [Linkable]
    forall a. [a] -> [a] -> [a]
    ++ [Linkable]
    lnks_needed, [UnitId]
    pkgs_needed, UniqDSet UnitId
    pkgs_s) }
      where
        dflags :: DynFlags
    dflags = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
        mod_graph :: ModuleGraph
    mod_graph = HscEnv -> ModuleGraph
    hsc_mod_graph HscEnv
    hsc_env

        -- This code is used in `--make` mode to calculate the home package and unit dependencies
        -- for a set of modules.
        --
        -- It is significantly more efficient to use the shared transitive dependency
        -- calculation than to compute the transitive dependency set in the same manner as oneShot mode.

        -- It is also a matter of correctness to use the module graph so that dependencies between home units
        -- is resolved correctly.
        make_deps_loop :: (UniqDSet UnitId, Set.Set NodeKey) -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set.Set NodeKey)
        make_deps_loop :: (UniqDSet UnitId, Set NodeKey)
    -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey)
    make_deps_loop (UniqDSet UnitId, Set NodeKey)
    found [] = (UniqDSet UnitId, Set NodeKey)
    found
        make_deps_loop found :: (UniqDSet UnitId, Set NodeKey)
    found@(UniqDSet UnitId
    found_units, Set NodeKey
    found_mods) (ModNodeKeyWithUid
    nk:[ModNodeKeyWithUid]
    nexts)
          | ModNodeKeyWithUid -> NodeKey
    NodeKey_Module ModNodeKeyWithUid
    nk NodeKey -> Set NodeKey -> Bool
    forall a. Ord a => a -> Set a -> Bool
    `Set.member` Set NodeKey
    found_mods = (UniqDSet UnitId, Set NodeKey)
    -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey)
    make_deps_loop (UniqDSet UnitId, Set NodeKey)
    found [ModNodeKeyWithUid]
    nexts
          | Bool
    otherwise =
            case NodeKey -> Map NodeKey (Set NodeKey) -> Maybe (Set NodeKey)
    forall k a. Ord k => k -> Map k a -> Maybe a
    M.lookup (ModNodeKeyWithUid -> NodeKey
    NodeKey_Module ModNodeKeyWithUid
    nk) (ModuleGraph -> Map NodeKey (Set NodeKey)
    mgTransDeps ModuleGraph
    mod_graph) of
                Just Set NodeKey
    trans_deps ->
                  let deps :: Set NodeKey
    deps = NodeKey -> Set NodeKey -> Set NodeKey
    forall a. Ord a => a -> Set a -> Set a
    Set.insert (ModNodeKeyWithUid -> NodeKey
    NodeKey_Module ModNodeKeyWithUid
    nk) Set NodeKey
    trans_deps
                      -- See #936 and the ghci.prog007 test for why we have to continue traversing through
                      -- boot modules.
                      todo_boot_mods :: [ModNodeKeyWithUid]
    todo_boot_mods = [ModuleNameWithIsBoot -> UnitId -> ModNodeKeyWithUid
    ModNodeKeyWithUid (ModuleName -> IsBootInterface -> ModuleNameWithIsBoot
    forall mod. mod -> IsBootInterface -> GenWithIsBoot mod
    GWIB ModuleName
    mn IsBootInterface
    NotBoot) UnitId
    uid | NodeKey_Module (ModNodeKeyWithUid (GWIB ModuleName
    mn IsBootInterface
    IsBoot) UnitId
    uid) <- Set NodeKey -> [NodeKey]
    forall a. Set a -> [a]
    Set.toList Set NodeKey
    trans_deps]
                  in (UniqDSet UnitId, Set NodeKey)
    -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey)
    make_deps_loop (UniqDSet UnitId
    found_units, Set NodeKey
    deps Set NodeKey -> Set NodeKey -> Set NodeKey
    forall a. Ord a => Set a -> Set a -> Set a
    `Set.union` Set NodeKey
    found_mods) ([ModNodeKeyWithUid]
    todo_boot_mods [ModNodeKeyWithUid] -> [ModNodeKeyWithUid] -> [ModNodeKeyWithUid]
    forall a. [a] -> [a] -> [a]
    ++ [ModNodeKeyWithUid]
    nexts)
                Maybe (Set NodeKey)
    Nothing ->
                  let (ModNodeKeyWithUid ModuleNameWithIsBoot
    _ UnitId
    uid) = ModNodeKeyWithUid
    nk
                  in (UniqDSet UnitId, Set NodeKey)
    -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey)
    make_deps_loop (UniqDSet UnitId -> UnitId -> UniqDSet UnitId
    forall a. Uniquable a => UniqDSet a -> a -> UniqDSet a
    addOneToUniqDSet UniqDSet UnitId
    found_units UnitId
    uid, Set NodeKey
    found_mods) [ModNodeKeyWithUid]
    nexts

        mkNk :: Module -> ModNodeKeyWithUid
    mkNk Module
    m = ModuleNameWithIsBoot -> UnitId -> ModNodeKeyWithUid
    ModNodeKeyWithUid (ModuleName -> IsBootInterface -> ModuleNameWithIsBoot
    forall mod. mod -> IsBootInterface -> GenWithIsBoot mod
    GWIB (Module -> ModuleName
    forall unit. GenModule unit -> ModuleName
    moduleName Module
    m) IsBootInterface
    NotBoot) (Module -> UnitId
    moduleUnitId Module
    m)
        (UniqDSet UnitId
    init_pkg_set, Set NodeKey
    all_deps) = (UniqDSet UnitId, Set NodeKey)
    -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey)
    make_deps_loop (UniqDSet UnitId
    forall a. UniqDSet a
    emptyUniqDSet, Set NodeKey
    forall a. Set a
    Set.empty) ([ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey))
    -> [ModNodeKeyWithUid] -> (UniqDSet UnitId, Set NodeKey)
    forall a b. (a -> b) -> a -> b
    $ (Module -> ModNodeKeyWithUid) -> [Module] -> [ModNodeKeyWithUid]
    forall a b. (a -> b) -> [a] -> [b]
    map Module -> ModNodeKeyWithUid
    mkNk ((Module -> Bool) -> [Module] -> [Module]
    forall a. (a -> Bool) -> [a] -> [a]
    filterOut Module -> Bool
    isInteractiveModule [Module]
    mods)

        all_home_mods :: [ModNodeKeyWithUid]
    all_home_mods = [ModNodeKeyWithUid
    with_uid | NodeKey_Module ModNodeKeyWithUid
    with_uid <- Set NodeKey -> [NodeKey]
    forall a. Set a -> [a]
    Set.toList Set NodeKey
    all_deps]

        get_mod_info :: ModNodeKeyWithUid -> IO (UniqDSet UnitId, Maybe Module)
    get_mod_info (ModNodeKeyWithUid ModuleNameWithIsBoot
    gwib UnitId
    uid) =
          case UnitEnvGraph HomeUnitEnv
    -> UnitId -> ModuleName -> Maybe HomeModInfo
    lookupHug (HscEnv -> UnitEnvGraph HomeUnitEnv
    hsc_HUG HscEnv
    hsc_env) UnitId
    uid (ModuleNameWithIsBoot -> ModuleName
    forall mod. GenWithIsBoot mod -> mod
    gwib_mod ModuleNameWithIsBoot
    gwib) of
            Just HomeModInfo
    hmi ->
              let iface :: ModIface
    iface = (HomeModInfo -> ModIface
    hm_iface HomeModInfo
    hmi)
                  mmod :: IO (Maybe Module)
    mmod = case ModIface -> HscSource
    forall (phase :: ModIfacePhase). ModIface_ phase -> HscSource
    mi_hsc_src ModIface
    iface of
                          HscSource
    HsBootFile -> Module -> IO (Maybe Module)
    forall a. Module -> IO a
    link_boot_mod_error (ModIface -> Module
    forall (phase :: ModIfacePhase). ModIface_ phase -> Module
    mi_module ModIface
    iface)
                          HscSource
    _ -> Maybe Module -> IO (Maybe Module)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (Maybe Module -> IO (Maybe Module))
    -> Maybe Module -> IO (Maybe Module)
    forall a b. (a -> b) -> a -> b
    $ Module -> Maybe Module
    forall a. a -> Maybe a
    Just (ModIface -> Module
    forall (phase :: ModIfacePhase). ModIface_ phase -> Module
    mi_module ModIface
    iface)

              in ([UnitId] -> UniqDSet UnitId
    forall a. Uniquable a => [a] -> UniqDSet a
    mkUniqDSet ([UnitId] -> UniqDSet UnitId) -> [UnitId] -> UniqDSet UnitId
    forall a b. (a -> b) -> a -> b
    $ Set UnitId -> [UnitId]
    forall a. Set a -> [a]
    Set.toList (Set UnitId -> [UnitId]) -> Set UnitId -> [UnitId]
    forall a b. (a -> b) -> a -> b
    $ Dependencies -> Set UnitId
    dep_direct_pkgs (ModIface -> Dependencies
    forall (phase :: ModIfacePhase). ModIface_ phase -> Dependencies
    mi_deps ModIface
    iface),) (Maybe Module -> (UniqDSet UnitId, Maybe Module))
    -> IO (Maybe Module) -> IO (UniqDSet UnitId, Maybe Module)
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$>  IO (Maybe Module)
    mmod
            Maybe HomeModInfo
    Nothing ->
              let err :: SDoc
    err = String -> SDoc
    text String
    "getLinkDeps: Home module not loaded" SDoc -> SDoc -> SDoc
    <+> ModuleName -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (ModuleNameWithIsBoot -> ModuleName
    forall mod. GenWithIsBoot mod -> mod
    gwib_mod ModuleNameWithIsBoot
    gwib) SDoc -> SDoc -> SDoc
    <+> UnitId -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr UnitId
    uid
              in GhcException -> IO (UniqDSet UnitId, Maybe Module)
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError (DynFlags -> SDoc -> String
    showSDoc DynFlags
    dflags SDoc
    err))

           -- This code is used in one-shot mode to traverse downwards through the HPT
           -- to find all link dependencies.
           -- The ModIface contains the transitive closure of the module dependencies
           -- within the current package, *except* for boot modules: if we encounter
           -- a boot module, we have to find its real interface and discover the
           -- dependencies of that.  Hence we need to traverse the dependency
           -- tree recursively.  See bug #936, testcase ghci/prog007.
        follow_deps :: [Module]             -- modules to follow
                    -> UniqDSet Module         -- accum. module dependencies
                    -> UniqDSet UnitId          -- accum. package dependencies
                    -> IO ([Module], UniqDSet UnitId) -- result
        follow_deps :: [Module]
    -> UniqDSet Module
    -> UniqDSet UnitId
    -> IO ([Module], UniqDSet UnitId)
    follow_deps []     UniqDSet Module
    acc_mods UniqDSet UnitId
    acc_pkgs
            = ([Module], UniqDSet UnitId) -> IO ([Module], UniqDSet UnitId)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (UniqDSet Module -> [Module]
    forall a. UniqDSet a -> [a]
    uniqDSetToList UniqDSet Module
    acc_mods, UniqDSet UnitId
    acc_pkgs)
        follow_deps (Module
    mod:[Module]
    mods) UniqDSet Module
    acc_mods UniqDSet UnitId
    acc_pkgs
            = do
              MaybeErr SDoc ModIface
    mb_iface <- SDoc
    -> HscEnv
    -> IfG (MaybeErr SDoc ModIface)
    -> IO (MaybeErr SDoc ModIface)
    forall a. SDoc -> HscEnv -> IfG a -> IO a
    initIfaceCheck (String -> SDoc
    text String
    "getLinkDeps") HscEnv
    hsc_env (IfG (MaybeErr SDoc ModIface) -> IO (MaybeErr SDoc ModIface))
    -> IfG (MaybeErr SDoc ModIface) -> IO (MaybeErr SDoc ModIface)
    forall a b. (a -> b) -> a -> b
    $
                            SDoc -> Module -> WhereFrom -> IfG (MaybeErr SDoc ModIface)
    forall lcl.
    SDoc -> Module -> WhereFrom -> IfM lcl (MaybeErr SDoc ModIface)
    loadInterface SDoc
    msg Module
    mod (IsBootInterface -> WhereFrom
    ImportByUser IsBootInterface
    NotBoot)
              ModIface
    iface <- case MaybeErr SDoc ModIface
    mb_iface of
                        Maybes.Failed SDoc
    err      -> GhcException -> IO ModIface
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError (DynFlags -> SDoc -> String
    showSDoc DynFlags
    dflags SDoc
    err))
                        Maybes.Succeeded ModIface
    iface -> ModIface -> IO ModIface
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ModIface
    iface

              Bool -> IO () -> IO ()
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
    when (ModIface -> IsBootInterface
    mi_boot ModIface
    iface IsBootInterface -> IsBootInterface -> Bool
    forall a. Eq a => a -> a -> Bool
    == IsBootInterface
    IsBoot) (IO () -> IO ()) -> IO () -> IO ()
    forall a b. (a -> b) -> a -> b
    $ Module -> IO ()
    forall a. Module -> IO a
    link_boot_mod_error Module
    mod

              let
                pkg :: Unit
    pkg = Module -> Unit
    forall unit. GenModule unit -> unit
    moduleUnit Module
    mod
                deps :: Dependencies
    deps  = ModIface -> Dependencies
    forall (phase :: ModIfacePhase). ModIface_ phase -> Dependencies
    mi_deps ModIface
    iface

                pkg_deps :: Set UnitId
    pkg_deps = Dependencies -> Set UnitId
    dep_direct_pkgs Dependencies
    deps
                ([ModuleName]
    boot_deps, [ModuleName]
    mod_deps) = (((UnitId, ModuleNameWithIsBoot) -> Either ModuleName ModuleName)
     -> [(UnitId, ModuleNameWithIsBoot)]
     -> ([ModuleName], [ModuleName]))
    -> [(UnitId, ModuleNameWithIsBoot)]
    -> ((UnitId, ModuleNameWithIsBoot) -> Either ModuleName ModuleName)
    -> ([ModuleName], [ModuleName])
    forall a b c. (a -> b -> c) -> b -> a -> c
    flip ((UnitId, ModuleNameWithIsBoot) -> Either ModuleName ModuleName)
    -> [(UnitId, ModuleNameWithIsBoot)] -> ([ModuleName], [ModuleName])
    forall a b c. (a -> Either b c) -> [a] -> ([b], [c])
    partitionWith (Set (UnitId, ModuleNameWithIsBoot)
    -> [(UnitId, ModuleNameWithIsBoot)]
    forall a. Set a -> [a]
    Set.toList (Dependencies -> Set (UnitId, ModuleNameWithIsBoot)
    dep_direct_mods Dependencies
    deps)) (((UnitId, ModuleNameWithIsBoot) -> Either ModuleName ModuleName)
     -> ([ModuleName], [ModuleName]))
    -> ((UnitId, ModuleNameWithIsBoot) -> Either ModuleName ModuleName)
    -> ([ModuleName], [ModuleName])
    forall a b. (a -> b) -> a -> b
    $
                  \case
                    (UnitId
    _, GWIB ModuleName
    m IsBootInterface
    IsBoot)  -> ModuleName -> Either ModuleName ModuleName
    forall a b. a -> Either a b
    Left ModuleName
    m
                    (UnitId
    _, GWIB ModuleName
    m IsBootInterface
    NotBoot) -> ModuleName -> Either ModuleName ModuleName
    forall a b. b -> Either a b
    Right ModuleName
    m

                mod_deps' :: [Module]
    mod_deps' = case HscEnv -> Maybe HomeUnit
    hsc_home_unit_maybe HscEnv
    hsc_env of
                              Maybe HomeUnit
    Nothing -> []
                              Just HomeUnit
    home_unit -> (Module -> Bool) -> [Module] -> [Module]
    forall a. (a -> Bool) -> [a] -> [a]
    filter (Bool -> Bool
    not (Bool -> Bool) -> (Module -> Bool) -> Module -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (Module -> UniqDSet Module -> Bool
    forall a. Uniquable a => a -> UniqDSet a -> Bool
    `elementOfUniqDSet` UniqDSet Module
    acc_mods)) ((ModuleName -> Module) -> [ModuleName] -> [Module]
    forall a b. (a -> b) -> [a] -> [b]
    map (HomeUnit -> ModuleName -> Module
    mkHomeModule HomeUnit
    home_unit) ([ModuleName] -> [Module]) -> [ModuleName] -> [Module]
    forall a b. (a -> b) -> a -> b
    $ ([ModuleName]
    boot_deps [ModuleName] -> [ModuleName] -> [ModuleName]
    forall a. [a] -> [a] -> [a]
    ++ [ModuleName]
    mod_deps))
                acc_mods' :: UniqDSet Module
    acc_mods'  = case HscEnv -> Maybe HomeUnit
    hsc_home_unit_maybe HscEnv
    hsc_env of
                              Maybe HomeUnit
    Nothing -> UniqDSet Module
    acc_mods
                              Just HomeUnit
    home_unit -> UniqDSet Module -> [Module] -> UniqDSet Module
    forall a. Uniquable a => UniqDSet a -> [a] -> UniqDSet a
    addListToUniqDSet UniqDSet Module
    acc_mods (Module
    mod Module -> [Module] -> [Module]
    forall a. a -> [a] -> [a]
    : (ModuleName -> Module) -> [ModuleName] -> [Module]
    forall a b. (a -> b) -> [a] -> [b]
    map (HomeUnit -> ModuleName -> Module
    mkHomeModule HomeUnit
    home_unit) [ModuleName]
    mod_deps)
                acc_pkgs' :: UniqDSet UnitId
    acc_pkgs'  = UniqDSet UnitId -> [UnitId] -> UniqDSet UnitId
    forall a. Uniquable a => UniqDSet a -> [a] -> UniqDSet a
    addListToUniqDSet UniqDSet UnitId
    acc_pkgs (Set UnitId -> [UnitId]
    forall a. Set a -> [a]
    Set.toList Set UnitId
    pkg_deps)

              case HscEnv -> Maybe HomeUnit
    hsc_home_unit_maybe HscEnv
    hsc_env of
                Just HomeUnit
    home_unit | HomeUnit -> Unit -> Bool
    isHomeUnit HomeUnit
    home_unit Unit
    pkg ->  [Module]
    -> UniqDSet Module
    -> UniqDSet UnitId
    -> IO ([Module], UniqDSet UnitId)
    follow_deps ([Module]
    mod_deps' [Module] -> [Module] -> [Module]
    forall a. [a] -> [a] -> [a]
    ++ [Module]
    mods)
                                                                          UniqDSet Module
    acc_mods' UniqDSet UnitId
    acc_pkgs'
                Maybe HomeUnit
    _ ->  [Module]
    -> UniqDSet Module
    -> UniqDSet UnitId
    -> IO ([Module], UniqDSet UnitId)
    follow_deps [Module]
    mods UniqDSet Module
    acc_mods (UniqDSet UnitId -> UnitId -> UniqDSet UnitId
    forall a. Uniquable a => UniqDSet a -> a -> UniqDSet a
    addOneToUniqDSet UniqDSet UnitId
    acc_pkgs' (Unit -> UnitId
    toUnitId Unit
    pkg))
            where
               msg :: SDoc
    msg = String -> SDoc
    text String
    "need to link module" SDoc -> SDoc -> SDoc
    <+> Module -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Module
    mod SDoc -> SDoc -> SDoc
    <+>
                      String -> SDoc
    text String
    "due to use of Template Haskell"

        link_boot_mod_error :: Module -> IO a
        link_boot_mod_error :: forall a. Module -> IO a
    link_boot_mod_error Module
    mod =
            GhcException -> IO a
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError (DynFlags -> SDoc -> String
    showSDoc DynFlags
    dflags (
                String -> SDoc
    text String
    "module" SDoc -> SDoc -> SDoc
    <+> Module -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr Module
    mod SDoc -> SDoc -> SDoc
    <+>
                String -> SDoc
    text String
    "cannot be linked; it is only available as a boot module")))

        no_obj :: Outputable a => a -> IO b
        no_obj :: forall a b. Outputable a => a -> IO b
    no_obj a
    mod = DynFlags -> SrcSpan -> SDoc -> IO b
    forall a. DynFlags -> SrcSpan -> SDoc -> IO a
    dieWith DynFlags
    dflags SrcSpan
    span (SDoc -> IO b) -> SDoc -> IO b
    forall a b. (a -> b) -> a -> b
    $
                         String -> SDoc
    text String
    "cannot find object file for module " SDoc -> SDoc -> SDoc
    <>
                            SDoc -> SDoc
    quotes (a -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr a
    mod) SDoc -> SDoc -> SDoc
    $$
                         SDoc
    while_linking_expr

        while_linking_expr :: SDoc
    while_linking_expr = String -> SDoc
    text String
    "while linking an interpreted expression"

            -- This one is a build-system bug

        get_linkable :: String -> Module -> IO Linkable
    get_linkable String
    osuf Module
    mod      -- A home-package module
            | Just HomeModInfo
    mod_info <- Module -> UnitEnvGraph HomeUnitEnv -> Maybe HomeModInfo
    lookupHugByModule Module
    mod (HscEnv -> UnitEnvGraph HomeUnitEnv
    hsc_HUG HscEnv
    hsc_env)
            = Linkable -> IO Linkable
    adjust_linkable (String -> Maybe Linkable -> Linkable
    forall a. HasCallStack => String -> Maybe a -> a
    Maybes.expectJust String
    "getLinkDeps" (HomeModInfo -> Maybe Linkable
    hm_linkable HomeModInfo
    mod_info))
            | Bool
    otherwise
            = do    -- It's not in the HPT because we are in one shot mode,
                    -- so use the Finder to get a ModLocation...
                 case HscEnv -> Maybe HomeUnit
    hsc_home_unit_maybe HscEnv
    hsc_env of
                  Maybe HomeUnit
    Nothing -> Module -> IO Linkable
    forall a b. Outputable a => a -> IO b
    no_obj Module
    mod
                  Just HomeUnit
    home_unit -> do

                    let fc :: FinderCache
    fc = HscEnv -> FinderCache
    hsc_FC HscEnv
    hsc_env
                    let dflags :: DynFlags
    dflags = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
                    let fopts :: FinderOpts
    fopts = DynFlags -> FinderOpts
    initFinderOpts DynFlags
    dflags
                    FindResult
    mb_stuff <- FinderCache
    -> FinderOpts -> HomeUnit -> ModuleName -> IO FindResult
    findHomeModule FinderCache
    fc FinderOpts
    fopts HomeUnit
    home_unit (Module -> ModuleName
    forall unit. GenModule unit -> ModuleName
    moduleName Module
    mod)
                    case FindResult
    mb_stuff of
                      Found ModLocation
    loc Module
    mod -> ModLocation -> Module -> IO Linkable
    found ModLocation
    loc Module
    mod
                      FindResult
    _ -> ModuleName -> IO Linkable
    forall a b. Outputable a => a -> IO b
    no_obj (Module -> ModuleName
    forall unit. GenModule unit -> ModuleName
    moduleName Module
    mod)
            where
                found :: ModLocation -> Module -> IO Linkable
    found ModLocation
    loc Module
    mod = do {
                    -- ...and then find the linkable for it
                   Maybe Linkable
    mb_lnk <- Module -> ModLocation -> IO (Maybe Linkable)
    findObjectLinkableMaybe Module
    mod ModLocation
    loc ;
                   case Maybe Linkable
    mb_lnk of {
                      Maybe Linkable
    Nothing  -> Module -> IO Linkable
    forall a b. Outputable a => a -> IO b
    no_obj Module
    mod ;
                      Just Linkable
    lnk -> Linkable -> IO Linkable
    adjust_linkable Linkable
    lnk
                  }}

                adjust_linkable :: Linkable -> IO Linkable
    adjust_linkable Linkable
    lnk
                    | Just String
    new_osuf <- Maybe String
    replace_osuf = do
                            [Unlinked]
    new_uls <- (Unlinked -> IO Unlinked) -> [Unlinked] -> IO [Unlinked]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (String -> Unlinked -> IO Unlinked
    adjust_ul String
    new_osuf)
                                            (Linkable -> [Unlinked]
    linkableUnlinked Linkable
    lnk)
                            Linkable -> IO Linkable
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Linkable
    lnk{ linkableUnlinked :: [Unlinked]
    linkableUnlinked=[Unlinked]
    new_uls }
                    | Bool
    otherwise =
                            Linkable -> IO Linkable
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Linkable
    lnk

                adjust_ul :: String -> Unlinked -> IO Unlinked
    adjust_ul String
    new_osuf (DotO String
    file) = do
                    Bool -> IO ()
    forall (m :: * -> *). (HasCallStack, Applicative m) => Bool -> m ()
    massert (String
    osuf String -> String -> Bool
    forall a. Eq a => [a] -> [a] -> Bool
    `isSuffixOf` String
    file)
                    let file_base :: String
    file_base = Maybe String -> String
    forall a. HasCallStack => Maybe a -> a
    fromJust (String -> String -> Maybe String
    stripExtension String
    osuf String
    file)
                        new_file :: String
    new_file = String
    file_base String -> String -> String
    <.> String
    new_osuf
                    Bool
    ok <- String -> IO Bool
    doesFileExist String
    new_file
                    if (Bool -> Bool
    not Bool
    ok)
                       then DynFlags -> SrcSpan -> SDoc -> IO Unlinked
    forall a. DynFlags -> SrcSpan -> SDoc -> IO a
    dieWith DynFlags
    dflags SrcSpan
    span (SDoc -> IO Unlinked) -> SDoc -> IO Unlinked
    forall a b. (a -> b) -> a -> b
    $
                              String -> SDoc
    text String
    "cannot find object file "
                                    SDoc -> SDoc -> SDoc
    <> SDoc -> SDoc
    quotes (String -> SDoc
    text String
    new_file) SDoc -> SDoc -> SDoc
    $$ SDoc
    while_linking_expr
                       else Unlinked -> IO Unlinked
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (String -> Unlinked
    DotO String
    new_file)
                adjust_ul String
    _ (DotA String
    fp) = String -> IO Unlinked
    forall a. String -> a
    panic (String
    "adjust_ul DotA " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String -> String
    forall a. Show a => a -> String
    show String
    fp)
                adjust_ul String
    _ (DotDLL String
    fp) = String -> IO Unlinked
    forall a. String -> a
    panic (String
    "adjust_ul DotDLL " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String -> String
    forall a. Show a => a -> String
    show String
    fp)
                adjust_ul String
    _ l :: Unlinked
    l@(BCOs {}) = Unlinked -> IO Unlinked
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Unlinked
    l

    {- **********************************************************************

                  Loading a Decls statement

      ********************************************************************* -}

    loadDecls :: Interp -> HscEnv -> SrcSpan -> CompiledByteCode -> IO ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)
    loadDecls :: Interp
    -> HscEnv
    -> SrcSpan
    -> CompiledByteCode
    -> IO ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)
    loadDecls Interp
    interp HscEnv
    hsc_env SrcSpan
    span cbc :: CompiledByteCode
    cbc@CompiledByteCode{[RemotePtr ()]
    [UnlinkedBCO]
    [FFIInfo]
    Maybe ModBreaks
    ItblEnv
    bc_bcos :: [UnlinkedBCO]
    bc_itbls :: ItblEnv
    bc_ffis :: [FFIInfo]
    bc_strs :: [RemotePtr ()]
    bc_breaks :: Maybe ModBreaks
    bc_bcos :: CompiledByteCode -> [UnlinkedBCO]
    bc_itbls :: CompiledByteCode -> ItblEnv
    bc_ffis :: CompiledByteCode -> [FFIInfo]
    bc_strs :: CompiledByteCode -> [RemotePtr ()]
    bc_breaks :: CompiledByteCode -> Maybe ModBreaks
    ..} = do
        -- Initialise the linker (if it's not been done already)
        Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env

        -- Take lock for the actual work.
        Interp
    -> (LoaderState
        -> IO
             (LoaderState, ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)))
    -> IO ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)
    forall a. Interp -> (LoaderState -> IO (LoaderState, a)) -> IO a
    modifyLoaderState Interp
    interp ((LoaderState
      -> IO
           (LoaderState, ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)))
     -> IO ([(Name, ForeignHValue)], [Linkable], PkgsLoaded))
    -> (LoaderState
        -> IO
             (LoaderState, ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)))
    -> IO ([(Name, ForeignHValue)], [Linkable], PkgsLoaded)
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls0 -> do
          -- Link the packages and modules required
          (LoaderState
    pls, SuccessFlag
    ok, [Linkable]
    links_needed, PkgsLoaded
    units_needed) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls0 SrcSpan
    span [Module]
    needed_mods
          if SuccessFlag -> Bool
    failed SuccessFlag
    ok
            then GhcException
    -> IO
         (LoaderState, ([(Name, ForeignHValue)], [Linkable], PkgsLoaded))
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError String
    "")
            else do
              -- Link the expression itself
              let ie :: ItblEnv
    ie = ItblEnv -> ItblEnv -> ItblEnv
    forall a. NameEnv a -> NameEnv a -> NameEnv a
    plusNameEnv (LoaderState -> ItblEnv
    itbl_env LoaderState
    pls) ItblEnv
    bc_itbls
                  ce :: ClosureEnv
    ce = LoaderState -> ClosureEnv
    closure_env LoaderState
    pls

              -- Link the necessary packages and linkables
              BCOOpts
    bco_opts <- DynFlags -> IO BCOOpts
    initBCOOpts (HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env)
              [(Name, HValueRef)]
    new_bindings <- BCOOpts
    -> Interp
    -> ItblEnv
    -> ClosureEnv
    -> [CompiledByteCode]
    -> IO [(Name, HValueRef)]
    linkSomeBCOs BCOOpts
    bco_opts Interp
    interp ItblEnv
    ie ClosureEnv
    ce [CompiledByteCode
    cbc]
              [(Name, ForeignHValue)]
    nms_fhvs <- Interp -> [(Name, HValueRef)] -> IO [(Name, ForeignHValue)]
    makeForeignNamedHValueRefs Interp
    interp [(Name, HValueRef)]
    new_bindings
              let pls2 :: LoaderState
    pls2 = LoaderState
    pls { closure_env :: ClosureEnv
    closure_env = ClosureEnv -> [(Name, ForeignHValue)] -> ClosureEnv
    extendClosureEnv ClosureEnv
    ce [(Name, ForeignHValue)]
    nms_fhvs
                             , itbl_env :: ItblEnv
    itbl_env    = ItblEnv
    ie }
              (LoaderState, ([(Name, ForeignHValue)], [Linkable], PkgsLoaded))
    -> IO
         (LoaderState, ([(Name, ForeignHValue)], [Linkable], PkgsLoaded))
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls2, ([(Name, ForeignHValue)]
    nms_fhvs, [Linkable]
    links_needed, PkgsLoaded
    units_needed))
      where
        free_names :: [Name]
    free_names = UniqDSet Name -> [Name]
    forall a. UniqDSet a -> [a]
    uniqDSetToList (UniqDSet Name -> [Name]) -> UniqDSet Name -> [Name]
    forall a b. (a -> b) -> a -> b
    $
          (UnlinkedBCO -> UniqDSet Name -> UniqDSet Name)
    -> UniqDSet Name -> [UnlinkedBCO] -> UniqDSet Name
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr (UniqDSet Name -> UniqDSet Name -> UniqDSet Name
    forall a. UniqDSet a -> UniqDSet a -> UniqDSet a
    unionUniqDSets (UniqDSet Name -> UniqDSet Name -> UniqDSet Name)
    -> (UnlinkedBCO -> UniqDSet Name)
    -> UnlinkedBCO
    -> UniqDSet Name
    -> UniqDSet Name
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . UnlinkedBCO -> UniqDSet Name
    bcoFreeNames) UniqDSet Name
    forall a. UniqDSet a
    emptyUniqDSet [UnlinkedBCO]
    bc_bcos

        needed_mods :: [Module]
        needed_mods :: [Module]
    needed_mods = [ (() :: Constraint) => Name -> Module
    Name -> Module
    nameModule Name
    n | Name
    n <- [Name]
    free_names,
                        Name -> Bool
    isExternalName Name
    n,       -- Names from other modules
                        Bool -> Bool
    not (Name -> Bool
    isWiredInName Name
    n)   -- Exclude wired-in names
                      ]                         -- (see note below)
        -- Exclude wired-in names because we may not have read
        -- their interface files, so getLinkDeps will fail
        -- All wired-in names are in the base package, which we link
        -- by default, so we can safely ignore them here.

    {- **********************************************************************

                  Loading a single module

      ********************************************************************* -}

    loadModule :: Interp -> HscEnv -> Module -> IO ()
    loadModule :: Interp -> HscEnv -> Module -> IO ()
    loadModule Interp
    interp HscEnv
    hsc_env Module
    mod = do
      Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env
      Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp ((LoaderState -> IO LoaderState) -> IO ())
    -> (LoaderState -> IO LoaderState) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls -> do
        (LoaderState
    pls', SuccessFlag
    ok, [Linkable]
    _, PkgsLoaded
    _) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls SrcSpan
    noSrcSpan [Module
    mod]
        if SuccessFlag -> Bool
    failed SuccessFlag
    ok
          then GhcException -> IO LoaderState
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    ProgramError String
    "could not load module")
          else LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls'

    {- **********************************************************************

                    Link some linkables
            The linkables may consist of a mixture of
            byte-code modules and object modules

      ********************************************************************* -}

    loadModuleLinkables :: Interp -> HscEnv -> LoaderState -> [Linkable] -> IO (LoaderState, SuccessFlag)
    loadModuleLinkables :: Interp
    -> HscEnv
    -> LoaderState
    -> [Linkable]
    -> IO (LoaderState, SuccessFlag)
    loadModuleLinkables Interp
    interp HscEnv
    hsc_env LoaderState
    pls [Linkable]
    linkables
      = IO (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a. IO a -> IO a
    mask_ (IO (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag))
    -> IO (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a b. (a -> b) -> a -> b
    $ do  -- don't want to be interrupted by ^C in here

            let ([Linkable]
    objs, [Linkable]
    bcos) = (Linkable -> Bool) -> [Linkable] -> ([Linkable], [Linkable])
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    partition Linkable -> Bool
    isObjectLinkable
                                  ((Linkable -> [Linkable]) -> [Linkable] -> [Linkable]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap Linkable -> [Linkable]
    partitionLinkable [Linkable]
    linkables)
            BCOOpts
    bco_opts <- DynFlags -> IO BCOOpts
    initBCOOpts (HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env)

                    -- Load objects first; they can't depend on BCOs
            (LoaderState
    pls1, SuccessFlag
    ok_flag) <- Interp
    -> HscEnv
    -> LoaderState
    -> [Linkable]
    -> IO (LoaderState, SuccessFlag)
    loadObjects Interp
    interp HscEnv
    hsc_env LoaderState
    pls [Linkable]
    objs

            if SuccessFlag -> Bool
    failed SuccessFlag
    ok_flag then
                    (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls1, SuccessFlag
    Failed)
              else do
                    LoaderState
    pls2 <- BCOOpts -> Interp -> LoaderState -> [Linkable] -> IO LoaderState
    dynLinkBCOs BCOOpts
    bco_opts Interp
    interp LoaderState
    pls1 [Linkable]
    bcos
                    (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls2, SuccessFlag
    Succeeded)

    -- HACK to support f-x-dynamic in the interpreter; no other purpose
    partitionLinkable :: Linkable -> [Linkable]
    partitionLinkable :: Linkable -> [Linkable]
    partitionLinkable Linkable
    li
       = let li_uls :: [Unlinked]
    li_uls = Linkable -> [Unlinked]
    linkableUnlinked Linkable
    li
             li_uls_obj :: [Unlinked]
    li_uls_obj = (Unlinked -> Bool) -> [Unlinked] -> [Unlinked]
    forall a. (a -> Bool) -> [a] -> [a]
    filter Unlinked -> Bool
    isObject [Unlinked]
    li_uls
             li_uls_bco :: [Unlinked]
    li_uls_bco = (Unlinked -> Bool) -> [Unlinked] -> [Unlinked]
    forall a. (a -> Bool) -> [a] -> [a]
    filter Unlinked -> Bool
    isInterpretable [Unlinked]
    li_uls
         in
             case ([Unlinked]
    li_uls_obj, [Unlinked]
    li_uls_bco) of
                (Unlinked
    _:[Unlinked]
    _, Unlinked
    _:[Unlinked]
    _) -> [Linkable
    li {linkableUnlinked :: [Unlinked]
    linkableUnlinked=[Unlinked]
    li_uls_obj},
                               Linkable
    li {linkableUnlinked :: [Unlinked]
    linkableUnlinked=[Unlinked]
    li_uls_bco}]
                ([Unlinked], [Unlinked])
    _ -> [Linkable
    li]

    findModuleLinkable_maybe :: LinkableSet -> Module -> Maybe Linkable
    findModuleLinkable_maybe :: LinkableSet -> Module -> Maybe Linkable
    findModuleLinkable_maybe = LinkableSet -> Module -> Maybe Linkable
    forall a. ModuleEnv a -> Module -> Maybe a
    lookupModuleEnv

    linkableInSet :: Linkable -> LinkableSet -> Bool
    linkableInSet :: Linkable -> LinkableSet -> Bool
    linkableInSet Linkable
    l LinkableSet
    objs_loaded =
      case LinkableSet -> Module -> Maybe Linkable
    findModuleLinkable_maybe LinkableSet
    objs_loaded (Linkable -> Module
    linkableModule Linkable
    l) of
            Maybe Linkable
    Nothing -> Bool
    False
            Just Linkable
    m  -> Linkable -> UTCTime
    linkableTime Linkable
    l UTCTime -> UTCTime -> Bool
    forall a. Eq a => a -> a -> Bool
    == Linkable -> UTCTime
    linkableTime Linkable
    m

    {- **********************************************************************

                    The object-code linker

      ********************************************************************* -}

    -- | Load the object files and link them
    --
    -- If the interpreter uses dynamic-linking, build a shared library and load it.
    -- Otherwise, use the RTS linker.
    loadObjects
      :: Interp
      -> HscEnv
      -> LoaderState
      -> [Linkable]
      -> IO (LoaderState, SuccessFlag)
    loadObjects :: Interp
    -> HscEnv
    -> LoaderState
    -> [Linkable]
    -> IO (LoaderState, SuccessFlag)
    loadObjects Interp
    interp HscEnv
    hsc_env LoaderState
    pls [Linkable]
    objs = do
            let (LinkableSet
    objs_loaded', [Linkable]
    new_objs) = LinkableSet -> [Linkable] -> (LinkableSet, [Linkable])
    rmDupLinkables (LoaderState -> LinkableSet
    objs_loaded LoaderState
    pls) [Linkable]
    objs
                pls1 :: LoaderState
    pls1                     = LoaderState
    pls { objs_loaded :: LinkableSet
    objs_loaded = LinkableSet
    objs_loaded' }
                unlinkeds :: [Unlinked]
    unlinkeds                = (Linkable -> [Unlinked]) -> [Linkable] -> [Unlinked]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap Linkable -> [Unlinked]
    linkableUnlinked [Linkable]
    new_objs
                wanted_objs :: [String]
    wanted_objs              = (Unlinked -> String) -> [Unlinked] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map Unlinked -> String
    nameOfObject [Unlinked]
    unlinkeds

            if Interp -> Bool
    interpreterDynamic Interp
    interp
                then do LoaderState
    pls2 <- Interp -> HscEnv -> LoaderState -> [String] -> IO LoaderState
    dynLoadObjs Interp
    interp HscEnv
    hsc_env LoaderState
    pls1 [String]
    wanted_objs
                        (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls2, SuccessFlag
    Succeeded)
                else do (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> String -> IO ()
    loadObj Interp
    interp) [String]
    wanted_objs

                        -- Link them all together
                        SuccessFlag
    ok <- Interp -> IO SuccessFlag
    resolveObjs Interp
    interp

                        -- If resolving failed, unload all our
                        -- object modules and carry on
                        if SuccessFlag -> Bool
    succeeded SuccessFlag
    ok then
                                (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls1, SuccessFlag
    Succeeded)
                          else do
                                LoaderState
    pls2 <- Interp -> [Linkable] -> LoaderState -> IO LoaderState
    unload_wkr Interp
    interp [] LoaderState
    pls1
                                (LoaderState, SuccessFlag) -> IO (LoaderState, SuccessFlag)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls2, SuccessFlag
    Failed)

    -- | Create a shared library containing the given object files and load it.
    dynLoadObjs :: Interp -> HscEnv -> LoaderState -> [FilePath] -> IO LoaderState
    dynLoadObjs :: Interp -> HscEnv -> LoaderState -> [String] -> IO LoaderState
    dynLoadObjs Interp
    _      HscEnv
    _       LoaderState
    pls                           []   = LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls
    dynLoadObjs Interp
    interp HscEnv
    hsc_env pls :: LoaderState
    pls@LoaderState{[(String, String)]
    ClosureEnv
    ItblEnv
    PkgsLoaded
    LinkableSet
    closure_env :: LoaderState -> ClosureEnv
    itbl_env :: LoaderState -> ItblEnv
    pkgs_loaded :: LoaderState -> PkgsLoaded
    bcos_loaded :: LoaderState -> LinkableSet
    objs_loaded :: LoaderState -> LinkableSet
    temp_sos :: LoaderState -> [(String, String)]
    closure_env :: ClosureEnv
    itbl_env :: ItblEnv
    bcos_loaded :: LinkableSet
    objs_loaded :: LinkableSet
    pkgs_loaded :: PkgsLoaded
    temp_sos :: [(String, String)]
    ..} [String]
    objs = do
        let unit_env :: UnitEnv
    unit_env = HscEnv -> UnitEnv
    hsc_unit_env HscEnv
    hsc_env
        let dflags :: DynFlags
    dflags   = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
        let logger :: Logger
    logger   = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env
        let tmpfs :: TmpFs
    tmpfs    = HscEnv -> TmpFs
    hsc_tmpfs HscEnv
    hsc_env
        let platform :: Platform
    platform = UnitEnv -> Platform
    ue_platform UnitEnv
    unit_env
        let minus_ls :: [String]
    minus_ls = [ String
    lib | Option (Char
    '-':Char
    'l':String
    lib) <- DynFlags -> [Option]
    ldInputs DynFlags
    dflags ]
        let minus_big_ls :: [String]
    minus_big_ls = [ String
    lib | Option (Char
    '-':Char
    'L':String
    lib) <- DynFlags -> [Option]
    ldInputs DynFlags
    dflags ]
        (String
    soFile, String
    libPath , String
    libName) <-
          Logger
    -> TmpFs
    -> TempDir
    -> TempFileLifetime
    -> String
    -> IO (String, String, String)
    newTempLibName Logger
    logger TmpFs
    tmpfs (DynFlags -> TempDir
    tmpDir DynFlags
    dflags) TempFileLifetime
    TFL_CurrentModule (Platform -> String
    platformSOExt Platform
    platform)
        let
            dflags2 :: DynFlags
    dflags2 = DynFlags
    dflags {
                          -- We don't want the original ldInputs in
                          -- (they're already linked in), but we do want
                          -- to link against previous dynLoadObjs
                          -- libraries if there were any, so that the linker
                          -- can resolve dependencies when it loads this
                          -- library.
                          ldInputs :: [Option]
    ldInputs =
                               (String -> [Option]) -> [String] -> [Option]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap (\String
    l -> [ String -> Option
    Option (String
    "-l" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    l) ])
                                         ([String] -> [String]
    forall a. Eq a => [a] -> [a]
    nub ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ (String, String) -> String
    forall a b. (a, b) -> b
    snd ((String, String) -> String) -> [(String, String)] -> [String]
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> [(String, String)]
    temp_sos)
                            [Option] -> [Option] -> [Option]
    forall a. [a] -> [a] -> [a]
    ++ (String -> [Option]) -> [String] -> [Option]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap (\String
    lp -> String -> Option
    Option (String
    "-L" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lp)
                                              Option -> [Option] -> [Option]
    forall a. a -> [a] -> [a]
    : if DynFlags -> OS -> Bool
    useXLinkerRPath DynFlags
    dflags (Platform -> OS
    platformOS Platform
    platform)
                                                then [ String -> Option
    Option String
    "-Xlinker"
                                                     , String -> Option
    Option String
    "-rpath"
                                                     , String -> Option
    Option String
    "-Xlinker"
                                                     , String -> Option
    Option String
    lp ]
                                                else [])
                                         ([String] -> [String]
    forall a. Eq a => [a] -> [a]
    nub ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ (String, String) -> String
    forall a b. (a, b) -> a
    fst ((String, String) -> String) -> [(String, String)] -> [String]
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> [(String, String)]
    temp_sos)
                            [Option] -> [Option] -> [Option]
    forall a. [a] -> [a] -> [a]
    ++ (String -> [Option]) -> [String] -> [Option]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap
                                 (\String
    lp -> String -> Option
    Option (String
    "-L" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lp)
                                      Option -> [Option] -> [Option]
    forall a. a -> [a] -> [a]
    : if DynFlags -> OS -> Bool
    useXLinkerRPath DynFlags
    dflags (Platform -> OS
    platformOS Platform
    platform)
                                        then [ String -> Option
    Option String
    "-Xlinker"
                                             , String -> Option
    Option String
    "-rpath"
                                             , String -> Option
    Option String
    "-Xlinker"
                                             , String -> Option
    Option String
    lp ]
                                        else [])
                                 [String]
    minus_big_ls
                            -- See Note [-Xlinker -rpath vs -Wl,-rpath]
                            [Option] -> [Option] -> [Option]
    forall a. [a] -> [a] -> [a]
    ++ (String -> Option) -> [String] -> [Option]
    forall a b. (a -> b) -> [a] -> [b]
    map (\String
    l -> String -> Option
    Option (String
    "-l" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    l)) [String]
    minus_ls,
                          -- Add -l options and -L options from dflags.
                          --
                          -- When running TH for a non-dynamic way, we still
                          -- need to make -l flags to link against the dynamic
                          -- libraries, so we need to add WayDyn to ways.
                          --
                          -- Even if we're e.g. profiling, we still want
                          -- the vanilla dynamic libraries, so we set the
                          -- ways / build tag to be just WayDyn.
                          targetWays_ :: Ways
    targetWays_ = Way -> Ways
    forall a. a -> Set a
    Set.singleton Way
    WayDyn,
                          outputFile_ :: Maybe String
    outputFile_ = String -> Maybe String
    forall a. a -> Maybe a
    Just String
    soFile
                      }
        -- link all "loaded packages" so symbols in those can be resolved
        -- Note: We are loading packages with local scope, so to see the
        -- symbols in this link we must link all loaded packages again.
        Logger
    -> TmpFs -> DynFlags -> UnitEnv -> [String] -> [UnitId] -> IO ()
    linkDynLib Logger
    logger TmpFs
    tmpfs DynFlags
    dflags2 UnitEnv
    unit_env [String]
    objs (LoadedPkgInfo -> UnitId
    loaded_pkg_uid (LoadedPkgInfo -> UnitId) -> [LoadedPkgInfo] -> [UnitId]
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> PkgsLoaded -> [LoadedPkgInfo]
    forall key elt. UniqDFM key elt -> [elt]
    eltsUDFM PkgsLoaded
    pkgs_loaded)

        -- if we got this far, extend the lifetime of the library file
        TmpFs -> TempFileLifetime -> [String] -> IO ()
    changeTempFilesLifetime TmpFs
    tmpfs TempFileLifetime
    TFL_GhcSession [String
    soFile]
        Maybe String
    m <- Interp -> String -> IO (Maybe String)
    loadDLL Interp
    interp String
    soFile
        case Maybe String
    m of
            Maybe String
    Nothing -> LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState -> IO LoaderState) -> LoaderState -> IO LoaderState
    forall a b. (a -> b) -> a -> b
    $! LoaderState
    pls { temp_sos :: [(String, String)]
    temp_sos = (String
    libPath, String
    libName) (String, String) -> [(String, String)] -> [(String, String)]
    forall a. a -> [a] -> [a]
    : [(String, String)]
    temp_sos }
            Just String
    err -> String -> String -> IO LoaderState
    forall a. String -> String -> IO a
    linkFail String
    msg String
    err
      where
        msg :: String
    msg = String
    "GHC.Linker.Loader.dynLoadObjs: Loading temp shared object failed"

    rmDupLinkables :: LinkableSet    -- Already loaded
                   -> [Linkable]    -- New linkables
                   -> (LinkableSet,  -- New loaded set (including new ones)
                       [Linkable])  -- New linkables (excluding dups)
    rmDupLinkables :: LinkableSet -> [Linkable] -> (LinkableSet, [Linkable])
    rmDupLinkables LinkableSet
    already [Linkable]
    ls
      = LinkableSet
    -> [Linkable] -> [Linkable] -> (LinkableSet, [Linkable])
    go LinkableSet
    already [] [Linkable]
    ls
      where
        go :: LinkableSet
    -> [Linkable] -> [Linkable] -> (LinkableSet, [Linkable])
    go LinkableSet
    already [Linkable]
    extras [] = (LinkableSet
    already, [Linkable]
    extras)
        go LinkableSet
    already [Linkable]
    extras (Linkable
    l:[Linkable]
    ls)
            | Linkable -> LinkableSet -> Bool
    linkableInSet Linkable
    l LinkableSet
    already = LinkableSet
    -> [Linkable] -> [Linkable] -> (LinkableSet, [Linkable])
    go LinkableSet
    already     [Linkable]
    extras     [Linkable]
    ls
            | Bool
    otherwise               = LinkableSet
    -> [Linkable] -> [Linkable] -> (LinkableSet, [Linkable])
    go (LinkableSet -> Module -> Linkable -> LinkableSet
    forall a. ModuleEnv a -> Module -> a -> ModuleEnv a
    extendModuleEnv LinkableSet
    already (Linkable -> Module
    linkableModule Linkable
    l) Linkable
    l) (Linkable
    lLinkable -> [Linkable] -> [Linkable]
    forall a. a -> [a] -> [a]
    :[Linkable]
    extras) [Linkable]
    ls

    {- **********************************************************************

                    The byte-code linker

      ********************************************************************* -}

    dynLinkBCOs :: BCOOpts -> Interp -> LoaderState -> [Linkable] -> IO LoaderState
    dynLinkBCOs :: BCOOpts -> Interp -> LoaderState -> [Linkable] -> IO LoaderState
    dynLinkBCOs BCOOpts
    bco_opts Interp
    interp LoaderState
    pls [Linkable]
    bcos = do

            let (LinkableSet
    bcos_loaded', [Linkable]
    new_bcos) = LinkableSet -> [Linkable] -> (LinkableSet, [Linkable])
    rmDupLinkables (LoaderState -> LinkableSet
    bcos_loaded LoaderState
    pls) [Linkable]
    bcos
                pls1 :: LoaderState
    pls1                     = LoaderState
    pls { bcos_loaded :: LinkableSet
    bcos_loaded = LinkableSet
    bcos_loaded' }
                unlinkeds :: [Unlinked]
                unlinkeds :: [Unlinked]
    unlinkeds                = (Linkable -> [Unlinked]) -> [Linkable] -> [Unlinked]
    forall (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap Linkable -> [Unlinked]
    linkableUnlinked [Linkable]
    new_bcos

                cbcs :: [CompiledByteCode]
                cbcs :: [CompiledByteCode]
    cbcs      = (Unlinked -> CompiledByteCode) -> [Unlinked] -> [CompiledByteCode]
    forall a b. (a -> b) -> [a] -> [b]
    map Unlinked -> CompiledByteCode
    byteCodeOfObject [Unlinked]
    unlinkeds

                ies :: [ItblEnv]
    ies        = (CompiledByteCode -> ItblEnv) -> [CompiledByteCode] -> [ItblEnv]
    forall a b. (a -> b) -> [a] -> [b]
    map CompiledByteCode -> ItblEnv
    bc_itbls [CompiledByteCode]
    cbcs
                gce :: ClosureEnv
    gce       = LoaderState -> ClosureEnv
    closure_env LoaderState
    pls
                final_ie :: ItblEnv
    final_ie  = (ItblEnv -> ItblEnv -> ItblEnv) -> ItblEnv -> [ItblEnv] -> ItblEnv
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr ItblEnv -> ItblEnv -> ItblEnv
    forall a. NameEnv a -> NameEnv a -> NameEnv a
    plusNameEnv (LoaderState -> ItblEnv
    itbl_env LoaderState
    pls) [ItblEnv]
    ies

            [(Name, HValueRef)]
    names_and_refs <- BCOOpts
    -> Interp
    -> ItblEnv
    -> ClosureEnv
    -> [CompiledByteCode]
    -> IO [(Name, HValueRef)]
    linkSomeBCOs BCOOpts
    bco_opts Interp
    interp ItblEnv
    final_ie ClosureEnv
    gce [CompiledByteCode]
    cbcs

            -- We only want to add the external ones to the ClosureEnv
            let ([(Name, HValueRef)]
    to_add, [(Name, HValueRef)]
    to_drop) = ((Name, HValueRef) -> Bool)
    -> [(Name, HValueRef)]
    -> ([(Name, HValueRef)], [(Name, HValueRef)])
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    partition (Name -> Bool
    isExternalName(Name -> Bool)
    -> ((Name, HValueRef) -> Name) -> (Name, HValueRef) -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    .(Name, HValueRef) -> Name
    forall a b. (a, b) -> a
    fst) [(Name, HValueRef)]
    names_and_refs

            -- Immediately release any HValueRefs we're not going to add
            Interp -> [HValueRef] -> IO ()
    freeHValueRefs Interp
    interp (((Name, HValueRef) -> HValueRef)
    -> [(Name, HValueRef)] -> [HValueRef]
    forall a b. (a -> b) -> [a] -> [b]
    map (Name, HValueRef) -> HValueRef
    forall a b. (a, b) -> b
    snd [(Name, HValueRef)]
    to_drop)
            -- Wrap finalizers on the ones we want to keep
            [(Name, ForeignHValue)]
    new_binds <- Interp -> [(Name, HValueRef)] -> IO [(Name, ForeignHValue)]
    makeForeignNamedHValueRefs Interp
    interp [(Name, HValueRef)]
    to_add

            LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls1 { closure_env :: ClosureEnv
    closure_env = ClosureEnv -> [(Name, ForeignHValue)] -> ClosureEnv
    extendClosureEnv ClosureEnv
    gce [(Name, ForeignHValue)]
    new_binds,
                          itbl_env :: ItblEnv
    itbl_env    = ItblEnv
    final_ie }

    -- Link a bunch of BCOs and return references to their values
    linkSomeBCOs :: BCOOpts
                 -> Interp
                 -> ItblEnv
                 -> ClosureEnv
                 -> [CompiledByteCode]
                 -> IO [(Name,HValueRef)]
                            -- The returned HValueRefs are associated 1-1 with
                            -- the incoming unlinked BCOs.  Each gives the
                            -- value of the corresponding unlinked BCO

    linkSomeBCOs :: BCOOpts
    -> Interp
    -> ItblEnv
    -> ClosureEnv
    -> [CompiledByteCode]
    -> IO [(Name, HValueRef)]
    linkSomeBCOs BCOOpts
    bco_opts Interp
    interp ItblEnv
    ie ClosureEnv
    ce [CompiledByteCode]
    mods = (CompiledByteCode
     -> ([(RemoteRef BreakArray, [UnlinkedBCO])]
         -> IO [(Name, HValueRef)])
     -> [(RemoteRef BreakArray, [UnlinkedBCO])]
     -> IO [(Name, HValueRef)])
    -> ([(RemoteRef BreakArray, [UnlinkedBCO])]
        -> IO [(Name, HValueRef)])
    -> [CompiledByteCode]
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    -> IO [(Name, HValueRef)]
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr CompiledByteCode
    -> ([(RemoteRef BreakArray, [UnlinkedBCO])]
        -> IO [(Name, HValueRef)])
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    -> IO [(Name, HValueRef)]
    forall {b}.
    CompiledByteCode
    -> ([(RemoteRef BreakArray, [UnlinkedBCO])] -> IO b)
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    -> IO b
    fun [(RemoteRef BreakArray, [UnlinkedBCO])] -> IO [(Name, HValueRef)]
    do_link [CompiledByteCode]
    mods []
     where
      fun :: CompiledByteCode
    -> ([(RemoteRef BreakArray, [UnlinkedBCO])] -> IO b)
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    -> IO b
    fun CompiledByteCode{[RemotePtr ()]
    [UnlinkedBCO]
    [FFIInfo]
    Maybe ModBreaks
    ItblEnv
    bc_bcos :: CompiledByteCode -> [UnlinkedBCO]
    bc_itbls :: CompiledByteCode -> ItblEnv
    bc_ffis :: CompiledByteCode -> [FFIInfo]
    bc_strs :: CompiledByteCode -> [RemotePtr ()]
    bc_breaks :: CompiledByteCode -> Maybe ModBreaks
    bc_bcos :: [UnlinkedBCO]
    bc_itbls :: ItblEnv
    bc_ffis :: [FFIInfo]
    bc_strs :: [RemotePtr ()]
    bc_breaks :: Maybe ModBreaks
    ..} [(RemoteRef BreakArray, [UnlinkedBCO])] -> IO b
    inner [(RemoteRef BreakArray, [UnlinkedBCO])]
    accum =
        case Maybe ModBreaks
    bc_breaks of
          Maybe ModBreaks
    Nothing -> [(RemoteRef BreakArray, [UnlinkedBCO])] -> IO b
    inner ((String -> RemoteRef BreakArray
    forall a. String -> a
    panic String
    "linkSomeBCOs: no break array", [UnlinkedBCO]
    bc_bcos) (RemoteRef BreakArray, [UnlinkedBCO])
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    forall a. a -> [a] -> [a]
    : [(RemoteRef BreakArray, [UnlinkedBCO])]
    accum)
          Just ModBreaks
    mb -> ForeignRef BreakArray -> (RemoteRef BreakArray -> IO b) -> IO b
    forall a b. ForeignRef a -> (RemoteRef a -> IO b) -> IO b
    withForeignRef (ModBreaks -> ForeignRef BreakArray
    modBreaks_flags ModBreaks
    mb) ((RemoteRef BreakArray -> IO b) -> IO b)
    -> (RemoteRef BreakArray -> IO b) -> IO b
    forall a b. (a -> b) -> a -> b
    $ \RemoteRef BreakArray
    breakarray ->
                       [(RemoteRef BreakArray, [UnlinkedBCO])] -> IO b
    inner ((RemoteRef BreakArray
    breakarray, [UnlinkedBCO]
    bc_bcos) (RemoteRef BreakArray, [UnlinkedBCO])
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    -> [(RemoteRef BreakArray, [UnlinkedBCO])]
    forall a. a -> [a] -> [a]
    : [(RemoteRef BreakArray, [UnlinkedBCO])]
    accum)

      do_link :: [(RemoteRef BreakArray, [UnlinkedBCO])] -> IO [(Name, HValueRef)]
    do_link [] = [(Name, HValueRef)] -> IO [(Name, HValueRef)]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return []
      do_link [(RemoteRef BreakArray, [UnlinkedBCO])]
    mods = do
        let flat :: [(RemoteRef BreakArray, UnlinkedBCO)]
    flat = [ (RemoteRef BreakArray
    breakarray, UnlinkedBCO
    bco) | (RemoteRef BreakArray
    breakarray, [UnlinkedBCO]
    bcos) <- [(RemoteRef BreakArray, [UnlinkedBCO])]
    mods, UnlinkedBCO
    bco <- [UnlinkedBCO]
    bcos ]
            names :: [Name]
    names = ((RemoteRef BreakArray, UnlinkedBCO) -> Name)
    -> [(RemoteRef BreakArray, UnlinkedBCO)] -> [Name]
    forall a b. (a -> b) -> [a] -> [b]
    map (UnlinkedBCO -> Name
    unlinkedBCOName (UnlinkedBCO -> Name)
    -> ((RemoteRef BreakArray, UnlinkedBCO) -> UnlinkedBCO)
    -> (RemoteRef BreakArray, UnlinkedBCO)
    -> Name
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (RemoteRef BreakArray, UnlinkedBCO) -> UnlinkedBCO
    forall a b. (a, b) -> b
    snd) [(RemoteRef BreakArray, UnlinkedBCO)]
    flat
            bco_ix :: NameEnv Int
    bco_ix = [(Name, Int)] -> NameEnv Int
    forall a. [(Name, a)] -> NameEnv a
    mkNameEnv ([Name] -> [Int] -> [(Name, Int)]
    forall a b. [a] -> [b] -> [(a, b)]
    zip [Name]
    names [Int
    0..])
        [ResolvedBCO]
    resolved <- [IO ResolvedBCO] -> IO [ResolvedBCO]
    forall (t :: * -> *) (m :: * -> *) a.
    (Traversable t, Monad m) =>
    t (m a) -> m (t a)
    forall (m :: * -> *) a. Monad m => [m a] -> m [a]
    sequence [ Interp
    -> ItblEnv
    -> ClosureEnv
    -> NameEnv Int
    -> RemoteRef BreakArray
    -> UnlinkedBCO
    -> IO ResolvedBCO
    linkBCO Interp
    interp ItblEnv
    ie ClosureEnv
    ce NameEnv Int
    bco_ix RemoteRef BreakArray
    breakarray UnlinkedBCO
    bco
                             | (RemoteRef BreakArray
    breakarray, UnlinkedBCO
    bco) <- [(RemoteRef BreakArray, UnlinkedBCO)]
    flat ]
        [HValueRef]
    hvrefs <- Interp -> BCOOpts -> [ResolvedBCO] -> IO [HValueRef]
    createBCOs Interp
    interp BCOOpts
    bco_opts [ResolvedBCO]
    resolved
        [(Name, HValueRef)] -> IO [(Name, HValueRef)]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([Name] -> [HValueRef] -> [(Name, HValueRef)]
    forall a b. [a] -> [b] -> [(a, b)]
    zip [Name]
    names [HValueRef]
    hvrefs)

    -- | Useful to apply to the result of 'linkSomeBCOs'
    makeForeignNamedHValueRefs
      :: Interp -> [(Name,HValueRef)] -> IO [(Name,ForeignHValue)]
    makeForeignNamedHValueRefs :: Interp -> [(Name, HValueRef)] -> IO [(Name, ForeignHValue)]
    makeForeignNamedHValueRefs Interp
    interp [(Name, HValueRef)]
    bindings =
      ((Name, HValueRef) -> IO (Name, ForeignHValue))
    -> [(Name, HValueRef)] -> IO [(Name, ForeignHValue)]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (\(Name
    n, HValueRef
    hvref) -> (Name
    n,) (ForeignHValue -> (Name, ForeignHValue))
    -> IO ForeignHValue -> IO (Name, ForeignHValue)
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    <$> Interp -> HValueRef -> IO ForeignHValue
    forall a. Interp -> RemoteRef a -> IO (ForeignRef a)
    mkFinalizedHValue Interp
    interp HValueRef
    hvref) [(Name, HValueRef)]
    bindings

    {- **********************************************************************

                    Unload some object modules

      ********************************************************************* -}

    -- ---------------------------------------------------------------------------
    -- | Unloading old objects ready for a new compilation sweep.
    --
    -- The compilation manager provides us with a list of linkables that it
    -- considers \"stable\", i.e. won't be recompiled this time around.  For
    -- each of the modules current linked in memory,
    --
    --   * if the linkable is stable (and it's the same one -- the user may have
    --     recompiled the module on the side), we keep it,
    --
    --   * otherwise, we unload it.
    --
    --   * we also implicitly unload all temporary bindings at this point.
    --
    unload
      :: Interp
      -> HscEnv
      -> [Linkable] -- ^ The linkables to *keep*.
      -> IO ()
    unload :: Interp -> HscEnv -> [Linkable] -> IO ()
    unload Interp
    interp HscEnv
    hsc_env [Linkable]
    linkables
      = IO () -> IO ()
    forall a. IO a -> IO a
    mask_ (IO () -> IO ()) -> IO () -> IO ()
    forall a b. (a -> b) -> a -> b
    $ do -- mask, so we're safe from Ctrl-C in here

            -- Initialise the linker (if it's not been done already)
            Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env

            LoaderState
    new_pls
                <- Interp
    -> (LoaderState -> IO (LoaderState, LoaderState)) -> IO LoaderState
    forall a. Interp -> (LoaderState -> IO (LoaderState, a)) -> IO a
    modifyLoaderState Interp
    interp ((LoaderState -> IO (LoaderState, LoaderState)) -> IO LoaderState)
    -> (LoaderState -> IO (LoaderState, LoaderState)) -> IO LoaderState
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls -> do
                     LoaderState
    pls1 <- Interp -> [Linkable] -> LoaderState -> IO LoaderState
    unload_wkr Interp
    interp [Linkable]
    linkables LoaderState
    pls
                     (LoaderState, LoaderState) -> IO (LoaderState, LoaderState)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState
    pls1, LoaderState
    pls1)

            let logger :: Logger
    logger = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env
            Logger -> Int -> SDoc -> IO ()
    debugTraceMsg Logger
    logger Int
    3 (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $
              String -> SDoc
    text String
    "unload: retaining objs" SDoc -> SDoc -> SDoc
    <+> [Linkable] -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LinkableSet -> [Linkable]
    forall a. ModuleEnv a -> [a]
    moduleEnvElts (LinkableSet -> [Linkable]) -> LinkableSet -> [Linkable]
    forall a b. (a -> b) -> a -> b
    $ LoaderState -> LinkableSet
    objs_loaded LoaderState
    new_pls)
            Logger -> Int -> SDoc -> IO ()
    debugTraceMsg Logger
    logger Int
    3 (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $
              String -> SDoc
    text String
    "unload: retaining bcos" SDoc -> SDoc -> SDoc
    <+> [Linkable] -> SDoc
    forall a. Outputable a => a -> SDoc
    ppr (LinkableSet -> [Linkable]
    forall a. ModuleEnv a -> [a]
    moduleEnvElts (LinkableSet -> [Linkable]) -> LinkableSet -> [Linkable]
    forall a b. (a -> b) -> a -> b
    $ LoaderState -> LinkableSet
    bcos_loaded LoaderState
    new_pls)
            () -> IO ()
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()

    unload_wkr
      :: Interp
      -> [Linkable]                -- stable linkables
      -> LoaderState
      -> IO LoaderState
    -- Does the core unload business
    -- (the wrapper blocks exceptions and deals with the LS get and put)

    unload_wkr :: Interp -> [Linkable] -> LoaderState -> IO LoaderState
    unload_wkr Interp
    interp [Linkable]
    keep_linkables pls :: LoaderState
    pls@LoaderState{[(String, String)]
    ClosureEnv
    ItblEnv
    PkgsLoaded
    LinkableSet
    closure_env :: LoaderState -> ClosureEnv
    itbl_env :: LoaderState -> ItblEnv
    pkgs_loaded :: LoaderState -> PkgsLoaded
    bcos_loaded :: LoaderState -> LinkableSet
    objs_loaded :: LoaderState -> LinkableSet
    temp_sos :: LoaderState -> [(String, String)]
    closure_env :: ClosureEnv
    itbl_env :: ItblEnv
    bcos_loaded :: LinkableSet
    objs_loaded :: LinkableSet
    pkgs_loaded :: PkgsLoaded
    temp_sos :: [(String, String)]
    ..}  = do
      -- NB. careful strictness here to avoid keeping the old LS when
      -- we're unloading some code.  -fghci-leak-check with the tests in
      -- testsuite/ghci can detect space leaks here.

      let ([Linkable]
    objs_to_keep', [Linkable]
    bcos_to_keep') = (Linkable -> Bool) -> [Linkable] -> ([Linkable], [Linkable])
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    partition Linkable -> Bool
    isObjectLinkable [Linkable]
    keep_linkables
          objs_to_keep :: LinkableSet
    objs_to_keep = [Linkable] -> LinkableSet
    mkLinkableSet [Linkable]
    objs_to_keep'
          bcos_to_keep :: LinkableSet
    bcos_to_keep = [Linkable] -> LinkableSet
    mkLinkableSet [Linkable]
    bcos_to_keep'

          discard :: LinkableSet -> Linkable -> Bool
    discard LinkableSet
    keep Linkable
    l = Bool -> Bool
    not (Linkable -> LinkableSet -> Bool
    linkableInSet Linkable
    l LinkableSet
    keep)

          (LinkableSet
    objs_to_unload, LinkableSet
    remaining_objs_loaded) =
             (Linkable -> Bool) -> LinkableSet -> (LinkableSet, LinkableSet)
    forall a. (a -> Bool) -> ModuleEnv a -> (ModuleEnv a, ModuleEnv a)
    partitionModuleEnv (LinkableSet -> Linkable -> Bool
    discard LinkableSet
    objs_to_keep) LinkableSet
    objs_loaded
          (LinkableSet
    bcos_to_unload, LinkableSet
    remaining_bcos_loaded) =
             (Linkable -> Bool) -> LinkableSet -> (LinkableSet, LinkableSet)
    forall a. (a -> Bool) -> ModuleEnv a -> (ModuleEnv a, ModuleEnv a)
    partitionModuleEnv (LinkableSet -> Linkable -> Bool
    discard LinkableSet
    bcos_to_keep) LinkableSet
    bcos_loaded

          linkables_to_unload :: [Linkable]
    linkables_to_unload = LinkableSet -> [Linkable]
    forall a. ModuleEnv a -> [a]
    moduleEnvElts LinkableSet
    objs_to_unload [Linkable] -> [Linkable] -> [Linkable]
    forall a. [a] -> [a] -> [a]
    ++ LinkableSet -> [Linkable]
    forall a. ModuleEnv a -> [a]
    moduleEnvElts LinkableSet
    bcos_to_unload

      (Linkable -> IO ()) -> [Linkable] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ Linkable -> IO ()
    unloadObjs [Linkable]
    linkables_to_unload

      -- If we unloaded any object files at all, we need to purge the cache
      -- of lookupSymbol results.
      Bool -> IO () -> IO ()
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
    when (Bool -> Bool
    not ([Linkable] -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null ((Linkable -> Bool) -> [Linkable] -> [Linkable]
    forall a. (a -> Bool) -> [a] -> [a]
    filter (Bool -> Bool
    not (Bool -> Bool) -> (Linkable -> Bool) -> Linkable -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . [String] -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null ([String] -> Bool) -> (Linkable -> [String]) -> Linkable -> Bool
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Linkable -> [String]
    linkableObjs) [Linkable]
    linkables_to_unload))) (IO () -> IO ()) -> IO () -> IO ()
    forall a b. (a -> b) -> a -> b
    $
        Interp -> IO ()
    purgeLookupSymbolCache Interp
    interp

      let -- Note that we want to remove all *local*
          -- (i.e. non-isExternal) names too (these are the
          -- temporary bindings from the command line).
          keep_name :: (Name, a) -> Bool
          keep_name :: forall a. (Name, a) -> Bool
    keep_name (Name
    n,a
    _) = Name -> Bool
    isExternalName Name
    n Bool -> Bool -> Bool
    &&
                            (() :: Constraint) => Name -> Module
    Name -> Module
    nameModule Name
    n Module -> LinkableSet -> Bool
    forall a. Module -> ModuleEnv a -> Bool
    `elemModuleEnv` LinkableSet
    remaining_bcos_loaded

          itbl_env' :: ItblEnv
    itbl_env'     = ((Name, ItblPtr) -> Bool) -> ItblEnv -> ItblEnv
    forall elt. (elt -> Bool) -> NameEnv elt -> NameEnv elt
    filterNameEnv (Name, ItblPtr) -> Bool
    forall a. (Name, a) -> Bool
    keep_name ItblEnv
    itbl_env
          closure_env' :: ClosureEnv
    closure_env'  = ((Name, ForeignHValue) -> Bool) -> ClosureEnv -> ClosureEnv
    forall elt. (elt -> Bool) -> NameEnv elt -> NameEnv elt
    filterNameEnv (Name, ForeignHValue) -> Bool
    forall a. (Name, a) -> Bool
    keep_name ClosureEnv
    closure_env

          !new_pls :: LoaderState
    new_pls = LoaderState
    pls { itbl_env :: ItblEnv
    itbl_env = ItblEnv
    itbl_env',
                           closure_env :: ClosureEnv
    closure_env = ClosureEnv
    closure_env',
                           bcos_loaded :: LinkableSet
    bcos_loaded = LinkableSet
    remaining_bcos_loaded,
                           objs_loaded :: LinkableSet
    objs_loaded = LinkableSet
    remaining_objs_loaded }

      LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    new_pls
      where
        unloadObjs :: Linkable -> IO ()
        unloadObjs :: Linkable -> IO ()
    unloadObjs Linkable
    lnk
          | Interp -> Bool
    interpreterDynamic Interp
    interp = () -> IO ()
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
            -- We don't do any cleanup when linking objects with the
            -- dynamic linker.  Doing so introduces extra complexity for
            -- not much benefit.

          | Bool
    otherwise
          = (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> String -> IO ()
    unloadObj Interp
    interp) [String
    f | DotO String
    f <- Linkable -> [Unlinked]
    linkableUnlinked Linkable
    lnk]
                    -- The components of a BCO linkable may contain
                    -- dot-o files.  Which is very confusing.
                    --
                    -- But the BCO parts can be unlinked just by
                    -- letting go of them (plus of course depopulating
                    -- the symbol table which is done in the main body)

    showLS :: LibrarySpec -> String
    showLS :: LibrarySpec -> String
    showLS (Objects [String]
    nms)  = String
    "(static) [" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String -> [String] -> String
    forall a. [a] -> [[a]] -> [a]
    intercalate String
    ", " [String]
    nms String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    "]"
    showLS (Archive String
    nm)   = String
    "(static archive) " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    nm
    showLS (DLL String
    nm)       = String
    "(dynamic) " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    nm
    showLS (DLLPath String
    nm)   = String
    "(dynamic) " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    nm
    showLS (Framework String
    nm) = String
    "(framework) " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    nm

    -- | Load exactly the specified packages, and their dependents (unless of
    -- course they are already loaded).  The dependents are loaded
    -- automatically, and it doesn't matter what order you specify the input
    -- packages.
    --
    loadPackages :: Interp -> HscEnv -> [UnitId] -> IO ()
    -- NOTE: in fact, since each module tracks all the packages it depends on,
    --       we don't really need to use the package-config dependencies.
    --
    -- However we do need the package-config stuff (to find aux libs etc),
    -- and following them lets us load libraries in the right order, which
    -- perhaps makes the error message a bit more localised if we get a link
    -- failure.  So the dependency walking code is still here.

    loadPackages :: Interp -> HscEnv -> [UnitId] -> IO ()
    loadPackages Interp
    interp HscEnv
    hsc_env [UnitId]
    new_pkgs = do
      -- It's probably not safe to try to load packages concurrently, so we take
      -- a lock.
      Interp -> HscEnv -> IO ()
    initLoaderState Interp
    interp HscEnv
    hsc_env
      Interp -> (LoaderState -> IO LoaderState) -> IO ()
    modifyLoaderState_ Interp
    interp ((LoaderState -> IO LoaderState) -> IO ())
    -> (LoaderState -> IO LoaderState) -> IO ()
    forall a b. (a -> b) -> a -> b
    $ \LoaderState
    pls ->
        Interp -> HscEnv -> [UnitId] -> LoaderState -> IO LoaderState
    loadPackages' Interp
    interp HscEnv
    hsc_env [UnitId]
    new_pkgs LoaderState
    pls

    loadPackages' :: Interp -> HscEnv -> [UnitId] -> LoaderState -> IO LoaderState
    loadPackages' :: Interp -> HscEnv -> [UnitId] -> LoaderState -> IO LoaderState
    loadPackages' Interp
    interp HscEnv
    hsc_env [UnitId]
    new_pks LoaderState
    pls = do
        PkgsLoaded
    pkgs' <- PkgsLoaded -> [UnitId] -> IO PkgsLoaded
    link (LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls) [UnitId]
    new_pks
        LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (LoaderState -> IO LoaderState) -> LoaderState -> IO LoaderState
    forall a b. (a -> b) -> a -> b
    $! LoaderState
    pls { pkgs_loaded :: PkgsLoaded
    pkgs_loaded = PkgsLoaded
    pkgs'
                      }
      where
         link :: PkgsLoaded -> [UnitId] -> IO PkgsLoaded
         link :: PkgsLoaded -> [UnitId] -> IO PkgsLoaded
    link PkgsLoaded
    pkgs [UnitId]
    new_pkgs =
             (PkgsLoaded -> UnitId -> IO PkgsLoaded)
    -> PkgsLoaded -> [UnitId] -> IO PkgsLoaded
    forall (t :: * -> *) (m :: * -> *) b a.
    (Foldable t, Monad m) =>
    (b -> a -> m b) -> b -> t a -> m b
    foldM PkgsLoaded -> UnitId -> IO PkgsLoaded
    link_one PkgsLoaded
    pkgs [UnitId]
    new_pkgs

         link_one :: PkgsLoaded -> UnitId -> IO PkgsLoaded
    link_one PkgsLoaded
    pkgs UnitId
    new_pkg
            | UnitId
    new_pkg UnitId -> PkgsLoaded -> Bool
    forall key elt. Uniquable key => key -> UniqDFM key elt -> Bool
    `elemUDFM` PkgsLoaded
    pkgs   -- Already linked
            = PkgsLoaded -> IO PkgsLoaded
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return PkgsLoaded
    pkgs

            | Just UnitInfo
    pkg_cfg <- UnitState -> UnitId -> Maybe UnitInfo
    lookupUnitId ((() :: Constraint) => HscEnv -> UnitState
    HscEnv -> UnitState
    hsc_units HscEnv
    hsc_env) UnitId
    new_pkg
            = do { let deps :: [UnitId]
    deps = UnitInfo -> [UnitId]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod -> [uid]
    unitDepends UnitInfo
    pkg_cfg
                   -- Link dependents first
                 ; PkgsLoaded
    pkgs' <- PkgsLoaded -> [UnitId] -> IO PkgsLoaded
    link PkgsLoaded
    pkgs [UnitId]
    deps
                    -- Now link the package itself
                 ; ([LibrarySpec]
    hs_cls, [LibrarySpec]
    extra_cls) <- Interp -> HscEnv -> UnitInfo -> IO ([LibrarySpec], [LibrarySpec])
    loadPackage Interp
    interp HscEnv
    hsc_env UnitInfo
    pkg_cfg
                 ; let trans_deps :: UniqDSet UnitId
    trans_deps = [UniqDSet UnitId] -> UniqDSet UnitId
    forall a. [UniqDSet a] -> UniqDSet a
    unionManyUniqDSets [ UniqDSet UnitId -> UnitId -> UniqDSet UnitId
    forall a. Uniquable a => UniqDSet a -> a -> UniqDSet a
    addOneToUniqDSet (LoadedPkgInfo -> UniqDSet UnitId
    loaded_pkg_trans_deps LoadedPkgInfo
    loaded_pkg_info) UnitId
    dep_pkg
                                                       | UnitId
    dep_pkg <- [UnitId]
    deps
                                                       , Just LoadedPkgInfo
    loaded_pkg_info <- Maybe LoadedPkgInfo -> [Maybe LoadedPkgInfo]
    forall a. a -> [a]
    forall (f :: * -> *) a. Applicative f => a -> f a
    pure (PkgsLoaded -> UnitId -> Maybe LoadedPkgInfo
    forall key elt.
    Uniquable key =>
    UniqDFM key elt -> key -> Maybe elt
    lookupUDFM PkgsLoaded
    pkgs' UnitId
    dep_pkg)
                                                       ]
                 ; PkgsLoaded -> IO PkgsLoaded
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (PkgsLoaded -> UnitId -> LoadedPkgInfo -> PkgsLoaded
    forall key elt.
    Uniquable key =>
    UniqDFM key elt -> key -> elt -> UniqDFM key elt
    addToUDFM PkgsLoaded
    pkgs' UnitId
    new_pkg (UnitId
    -> [LibrarySpec]
    -> [LibrarySpec]
    -> UniqDSet UnitId
    -> LoadedPkgInfo
    LoadedPkgInfo UnitId
    new_pkg [LibrarySpec]
    hs_cls [LibrarySpec]
    extra_cls UniqDSet UnitId
    trans_deps)) }

            | Bool
    otherwise
            = GhcException -> IO PkgsLoaded
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    CmdLineError (String
    "unknown package: " String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ FastString -> String
    unpackFS (UnitId -> FastString
    unitIdFS UnitId
    new_pkg)))

    loadPackage :: Interp -> HscEnv -> UnitInfo -> IO ([LibrarySpec], [LibrarySpec])
    loadPackage :: Interp -> HscEnv -> UnitInfo -> IO ([LibrarySpec], [LibrarySpec])
    loadPackage Interp
    interp HscEnv
    hsc_env UnitInfo
    pkg
       = do
            let dflags :: DynFlags
    dflags    = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
            let logger :: Logger
    logger    = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env
                platform :: Platform
    platform  = DynFlags -> Platform
    targetPlatform DynFlags
    dflags
                is_dyn :: Bool
    is_dyn    = Interp -> Bool
    interpreterDynamic Interp
    interp
                dirs :: [String]
    dirs | Bool
    is_dyn    = (FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack ([FilePathST] -> [String]) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> a -> b
    $ UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitLibraryDynDirs UnitInfo
    pkg
                     | Bool
    otherwise = (FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack ([FilePathST] -> [String]) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> a -> b
    $ UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitLibraryDirs UnitInfo
    pkg

            let hs_libs :: [String]
    hs_libs   = (FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack ([FilePathST] -> [String]) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> a -> b
    $ UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitLibraries UnitInfo
    pkg
                -- The FFI GHCi import lib isn't needed as
                -- GHC.Linker.Loader + rts/Linker.c link the
                -- interpreted references to FFI to the compiled FFI.
                -- We therefore filter it out so that we don't get
                -- duplicate symbol errors.
                hs_libs' :: [String]
    hs_libs'  =  (String -> Bool) -> [String] -> [String]
    forall a. (a -> Bool) -> [a] -> [a]
    filter (String
    "HSffi" String -> String -> Bool
    forall a. Eq a => a -> a -> Bool
    /=) [String]
    hs_libs

            -- Because of slight differences between the GHC dynamic linker and
            -- the native system linker some packages have to link with a
            -- different list of libraries when using GHCi. Examples include: libs
            -- that are actually gnu ld scripts, and the possibility that the .a
            -- libs do not exactly match the .so/.dll equivalents. So if the
            -- package file provides an "extra-ghci-libraries" field then we use
            -- that instead of the "extra-libraries" field.
                extdeplibs :: [String]
    extdeplibs = (FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack (if [FilePathST] -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null (UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitExtDepLibsGhc UnitInfo
    pkg)
                                          then UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitExtDepLibsSys UnitInfo
    pkg
                                          else UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitExtDepLibsGhc UnitInfo
    pkg)
                linkerlibs :: [String]
    linkerlibs = [ String
    lib | Char
    '-':Char
    'l':String
    lib <- ((FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack ([FilePathST] -> [String]) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> a -> b
    $ UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitLinkerOptions UnitInfo
    pkg) ]
                extra_libs :: [String]
    extra_libs = [String]
    extdeplibs [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    linkerlibs

            -- See Note [Fork/Exec Windows]
            [String]
    gcc_paths <- Logger -> DynFlags -> OS -> IO [String]
    getGCCPaths Logger
    logger DynFlags
    dflags (Platform -> OS
    platformOS Platform
    platform)
            [String]
    dirs_env <- String -> [String] -> IO [String]
    addEnvPaths String
    "LIBRARY_PATH" [String]
    dirs

            [LibrarySpec]
    hs_classifieds
               <- (String -> IO LibrarySpec) -> [String] -> IO [LibrarySpec]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (Interp
    -> HscEnv
    -> Bool
    -> [String]
    -> [String]
    -> String
    -> IO LibrarySpec
    locateLib Interp
    interp HscEnv
    hsc_env Bool
    True  [String]
    dirs_env [String]
    gcc_paths) [String]
    hs_libs'
            [LibrarySpec]
    extra_classifieds
               <- (String -> IO LibrarySpec) -> [String] -> IO [LibrarySpec]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (Interp
    -> HscEnv
    -> Bool
    -> [String]
    -> [String]
    -> String
    -> IO LibrarySpec
    locateLib Interp
    interp HscEnv
    hsc_env Bool
    False [String]
    dirs_env [String]
    gcc_paths) [String]
    extra_libs
            let classifieds :: [LibrarySpec]
    classifieds = [LibrarySpec]
    hs_classifieds [LibrarySpec] -> [LibrarySpec] -> [LibrarySpec]
    forall a. [a] -> [a] -> [a]
    ++ [LibrarySpec]
    extra_classifieds

            -- Complication: all the .so's must be loaded before any of the .o's.
            let known_dlls :: [String]
    known_dlls = [ String
    dll  | DLLPath String
    dll    <- [LibrarySpec]
    classifieds ]
    #if defined(CAN_LOAD_DLL)
                dlls :: [String]
    dlls       = [ String
    dll  | DLL String
    dll        <- [LibrarySpec]
    classifieds ]
    #endif
                objs :: [String]
    objs       = [ String
    obj  | Objects [String]
    objs    <- [LibrarySpec]
    classifieds
                                    , String
    obj <- [String]
    objs ]
                archs :: [String]
    archs      = [ String
    arch | Archive String
    arch   <- [LibrarySpec]
    classifieds ]

            -- Add directories to library search paths
            let dll_paths :: [String]
    dll_paths  = (String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> String
    takeDirectory [String]
    known_dlls
                all_paths :: [String]
    all_paths  = [String] -> [String]
    forall a. Eq a => [a] -> [a]
    nub ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ (String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> String
    normalise ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ [String]
    dll_paths [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    dirs
            [String]
    all_paths_env <- String -> [String] -> IO [String]
    addEnvPaths String
    "LD_LIBRARY_PATH" [String]
    all_paths
            [Ptr ()]
    pathCache <- (String -> IO (Ptr ())) -> [String] -> IO [Ptr ()]
    forall (t :: * -> *) (m :: * -> *) a b.
    (Traversable t, Monad m) =>
    (a -> m b) -> t a -> m (t b)
    forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
    mapM (Interp -> String -> IO (Ptr ())
    addLibrarySearchPath Interp
    interp) [String]
    all_paths_env

            Logger -> SDoc -> IO ()
    maybePutSDoc Logger
    logger
                (String -> SDoc
    text String
    "Loading unit " SDoc -> SDoc -> SDoc
    <> UnitInfo -> SDoc
    pprUnitInfoForUser UnitInfo
    pkg SDoc -> SDoc -> SDoc
    <> String -> SDoc
    text String
    " ... ")

    #if defined(CAN_LOAD_DLL)
            Interp -> Platform -> UnitInfo -> IO ()
    loadFrameworks Interp
    interp Platform
    platform UnitInfo
    pkg
            -- See Note [Crash early load_dyn and locateLib]
            -- Crash early if can't load any of `known_dlls`
            (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> HscEnv -> Bool -> String -> IO ()
    load_dyn Interp
    interp HscEnv
    hsc_env Bool
    True) [String]
    known_dlls
            -- For remaining `dlls` crash early only when there is surely
            -- no package's DLL around ... (not is_dyn)
            (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> HscEnv -> Bool -> String -> IO ()
    load_dyn Interp
    interp HscEnv
    hsc_env (Bool -> Bool
    not Bool
    is_dyn) (String -> IO ()) -> (String -> String) -> String -> IO ()
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . Platform -> String -> String
    platformSOName Platform
    platform) [String]
    dlls
    #endif
            -- After loading all the DLLs, we can load the static objects.
            -- Ordering isn't important here, because we do one final link
            -- step to resolve everything.
            (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> String -> IO ()
    loadObj Interp
    interp) [String]
    objs
            (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> String -> IO ()
    loadArchive Interp
    interp) [String]
    archs

            Logger -> String -> IO ()
    maybePutStr Logger
    logger String
    "linking ... "
            SuccessFlag
    ok <- Interp -> IO SuccessFlag
    resolveObjs Interp
    interp

            -- DLLs are loaded, reset the search paths
            -- Import libraries will be loaded via loadArchive so only
            -- reset the DLL search path after all archives are loaded
            -- as well.
            (Ptr () -> IO Bool) -> [Ptr ()] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ (Interp -> Ptr () -> IO Bool
    removeLibrarySearchPath Interp
    interp) ([Ptr ()] -> IO ()) -> [Ptr ()] -> IO ()
    forall a b. (a -> b) -> a -> b
    $ [Ptr ()] -> [Ptr ()]
    forall a. [a] -> [a]
    reverse [Ptr ()]
    pathCache

            if SuccessFlag -> Bool
    succeeded SuccessFlag
    ok
               then do
                 Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done."
                 ([LibrarySpec], [LibrarySpec]) -> IO ([LibrarySpec], [LibrarySpec])
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([LibrarySpec]
    hs_classifieds, [LibrarySpec]
    extra_classifieds)
               else let errmsg :: SDoc
    errmsg = String -> SDoc
    text String
    "unable to load unit `"
                                 SDoc -> SDoc -> SDoc
    <> UnitInfo -> SDoc
    pprUnitInfoForUser UnitInfo
    pkg SDoc -> SDoc -> SDoc
    <> String -> SDoc
    text String
    "'"
                     in GhcException -> IO ([LibrarySpec], [LibrarySpec])
    forall a. GhcException -> IO a
    throwGhcExceptionIO (String -> GhcException
    InstallationError (DynFlags -> SDoc -> String
    showSDoc DynFlags
    dflags SDoc
    errmsg))

    {-
    Note [Crash early load_dyn and locateLib]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    If a package is "normal" (exposes it's code from more than zero Haskell
    modules, unlike e.g. that in ghcilink004) and is built "dyn" way, then
    it has it's code compiled and linked into the DLL, which GHCi linker picks
    when loading the package's code (see the big comment in the beginning of
    `locateLib`).

    When loading DLLs, GHCi linker simply calls the system's `dlopen` or
    `LoadLibrary` APIs. This is quite different from the case when GHCi linker
    loads an object file or static library. When loading an object file or static
    library GHCi linker parses them and resolves all symbols "manually".
    These object file or static library may reference some external symbols
    defined in some external DLLs. And GHCi should know which these
    external DLLs are.

    But when GHCi loads a DLL, it's the *system* linker who manages all
    the necessary dependencies, and it is able to load this DLL not having
    any extra info. Thus we don't *have to* crash in this case even if we
    are unable to load any supposed dependencies explicitly.

    Suppose during GHCi session a client of the package wants to
    `foreign import` a symbol which isn't exposed by the package DLL, but
    is exposed by such an external (dependency) DLL.
    If the DLL isn't *explicitly* loaded because `load_dyn` failed to do
    this, then the client code eventually crashes because the GHCi linker
    isn't able to locate this symbol (GHCi linker maintains a list of
    explicitly loaded DLLs it looks into when trying to find a symbol).

    This is why we still should try to load all the dependency DLLs
    even though we know that the system linker loads them implicitly when
    loading the package DLL.

    Why we still keep the `crash_early` opportunity then not allowing such
    a permissive behaviour for any DLLs? Well, we, perhaps, improve a user
    experience in some cases slightly.

    But if it happens there exist other corner cases where our current
    usage of `crash_early` flag is overly restrictive, we may lift the
    restriction very easily.
    -}

    #if defined(CAN_LOAD_DLL)
    -- we have already searched the filesystem; the strings passed to load_dyn
    -- can be passed directly to loadDLL.  They are either fully-qualified
    -- ("/usr/lib/libfoo.so"), or unqualified ("libfoo.so").  In the latter case,
    -- loadDLL is going to search the system paths to find the library.
    load_dyn :: Interp -> HscEnv -> Bool -> FilePath -> IO ()
    load_dyn :: Interp -> HscEnv -> Bool -> String -> IO ()
    load_dyn Interp
    interp HscEnv
    hsc_env Bool
    crash_early String
    dll = do
      Maybe String
    r <- Interp -> String -> IO (Maybe String)
    loadDLL Interp
    interp String
    dll
      case Maybe String
    r of
        Maybe String
    Nothing  -> () -> IO ()
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
        Just String
    err ->
          if Bool
    crash_early
            then String -> IO ()
    forall a. String -> IO a
    cmdLineErrorIO String
    err
            else
              Bool -> IO () -> IO ()
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
    when (WarningFlag -> DiagOpts -> Bool
    diag_wopt WarningFlag
    Opt_WarnMissedExtraSharedLib DiagOpts
    diag_opts)
                (IO () -> IO ()) -> IO () -> IO ()
    forall a b. (a -> b) -> a -> b
    $ Logger -> MessageClass -> SrcSpan -> SDoc -> IO ()
    logMsg Logger
    logger
                    (DiagOpts -> DiagnosticReason -> MessageClass
    mkMCDiagnostic DiagOpts
    diag_opts (DiagnosticReason -> MessageClass)
    -> DiagnosticReason -> MessageClass
    forall a b. (a -> b) -> a -> b
    $ WarningFlag -> DiagnosticReason
    WarningWithFlag WarningFlag
    Opt_WarnMissedExtraSharedLib)
                      SrcSpan
    noSrcSpan (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $ PprStyle -> SDoc -> SDoc
    withPprStyle PprStyle
    defaultUserStyle (String -> SDoc
    note String
    err)
      where
        diag_opts :: DiagOpts
    diag_opts = DynFlags -> DiagOpts
    initDiagOpts (HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env)
        logger :: Logger
    logger = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env
        note :: String -> SDoc
    note String
    err = [SDoc] -> SDoc
    vcat ([SDoc] -> SDoc) -> [SDoc] -> SDoc
    forall a b. (a -> b) -> a -> b
    $ (String -> SDoc) -> [String] -> [SDoc]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> SDoc
    text
          [ String
    err
          , String
    "It's OK if you don't want to use symbols from it directly."
          , String
    "(the package DLL is loaded by the system linker"
          , String
    " which manages dependencies by itself)." ]

    loadFrameworks :: Interp -> Platform -> UnitInfo -> IO ()
    loadFrameworks :: Interp -> Platform -> UnitInfo -> IO ()
    loadFrameworks Interp
    interp Platform
    platform UnitInfo
    pkg
        = Bool -> IO () -> IO ()
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
    when (Platform -> Bool
    platformUsesFrameworks Platform
    platform) (IO () -> IO ()) -> IO () -> IO ()
    forall a b. (a -> b) -> a -> b
    $ (String -> IO ()) -> [String] -> IO ()
    forall (t :: * -> *) (m :: * -> *) a b.
    (Foldable t, Monad m) =>
    (a -> m b) -> t a -> m ()
    mapM_ String -> IO ()
    load [String]
    frameworks
      where
        fw_dirs :: [String]
    fw_dirs    = (FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack ([FilePathST] -> [String]) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> a -> b
    $ UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitExtDepFrameworkDirs UnitInfo
    pkg
        frameworks :: [String]
    frameworks = (FilePathST -> String) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map FilePathST -> String
    ST.unpack ([FilePathST] -> [String]) -> [FilePathST] -> [String]
    forall a b. (a -> b) -> a -> b
    $ UnitInfo -> [FilePathST]
    forall srcpkgid srcpkgname uid modulename mod.
    GenericUnitInfo srcpkgid srcpkgname uid modulename mod
    -> [FilePathST]
    Packages.unitExtDepFrameworks UnitInfo
    pkg

        load :: String -> IO ()
    load String
    fw = do  Maybe String
    r <- Interp -> [String] -> String -> IO (Maybe String)
    loadFramework Interp
    interp [String]
    fw_dirs String
    fw
                      case Maybe String
    r of
                        Maybe String
    Nothing  -> () -> IO ()
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ()
                        Just String
    err -> String -> IO ()
    forall a. String -> IO a
    cmdLineErrorIO (String
    "can't load framework: "
                                                    String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    fw String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    " (" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    err String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    ")" )
    #endif

    -- Try to find an object file for a given library in the given paths.
    -- If it isn't present, we assume that addDLL in the RTS can find it,
    -- which generally means that it should be a dynamic library in the
    -- standard system search path.
    -- For GHCi we tend to prefer dynamic libraries over static ones as
    -- they are easier to load and manage, have less overhead.
    locateLib
      :: Interp
      -> HscEnv
      -> Bool
      -> [FilePath]
      -> [FilePath]
      -> String
      -> IO LibrarySpec
    locateLib :: Interp
    -> HscEnv
    -> Bool
    -> [String]
    -> [String]
    -> String
    -> IO LibrarySpec
    locateLib Interp
    interp HscEnv
    hsc_env Bool
    is_hs [String]
    lib_dirs [String]
    gcc_dirs String
    lib
      | Bool -> Bool
    not Bool
    is_hs
        -- For non-Haskell libraries (e.g. gmp, iconv):
        --   first look in library-dirs for a dynamic library (on User paths only)
        --   (libfoo.so)
        --   then  try looking for import libraries on Windows (on User paths only)
        --   (.dll.a, .lib)
        --   first look in library-dirs for a dynamic library (on GCC paths only)
        --   (libfoo.so)
        --   then  check for system dynamic libraries (e.g. kernel32.dll on windows)
        --   then  try looking for import libraries on Windows (on GCC paths only)
        --   (.dll.a, .lib)
        --   then  look in library-dirs for a static library (libfoo.a)
        --   then look in library-dirs and inplace GCC for a dynamic library (libfoo.so)
        --   then  try looking for import libraries on Windows (.dll.a, .lib)
        --   then  look in library-dirs and inplace GCC for a static library (libfoo.a)
        --   then  try "gcc --print-file-name" to search gcc's search path
        --       for a dynamic library (#5289)
        --   otherwise, assume loadDLL can find it
        --
        --   The logic is a bit complicated, but the rationale behind it is that
        --   loading a shared library for us is O(1) while loading an archive is
        --   O(n). Loading an import library is also O(n) so in general we prefer
        --   shared libraries because they are simpler and faster.
        --
      =
    #if defined(CAN_LOAD_DLL)
        Bool -> IO (Maybe LibrarySpec)
    findDll   Bool
    user IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
    #endif
        Bool -> IO (Maybe LibrarySpec)
    tryImpLib Bool
    user IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
    #if defined(CAN_LOAD_DLL)
        Bool -> IO (Maybe LibrarySpec)
    findDll   Bool
    gcc  IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO (Maybe LibrarySpec)
    findSysDll     IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
    #endif
        Bool -> IO (Maybe LibrarySpec)
    tryImpLib Bool
    gcc  IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO (Maybe LibrarySpec)
    findArchive    IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO (Maybe LibrarySpec)
    tryGcc         IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO LibrarySpec
    assumeDll

      | Bool
    loading_dynamic_hs_libs -- search for .so libraries first.
      = IO (Maybe LibrarySpec)
    findHSDll     IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO (Maybe LibrarySpec)
    findDynObject IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO LibrarySpec
    assumeDll

      | Bool
    otherwise
        -- use HSfoo.{o,p_o} if it exists, otherwise fallback to libHSfoo{,_p}.a
      = IO (Maybe LibrarySpec)
    findObject  IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO (Maybe LibrarySpec)
    findArchive IO (Maybe LibrarySpec) -> IO LibrarySpec -> IO LibrarySpec
    forall {m :: * -> *} {b}. Monad m => m (Maybe b) -> m b -> m b
    `orElse`
        IO LibrarySpec
    assumeDll

       where
         dflags :: DynFlags
    dflags = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
         logger :: Logger
    logger = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env
         diag_opts :: DiagOpts
    diag_opts = DynFlags -> DiagOpts
    initDiagOpts DynFlags
    dflags
         dirs :: [String]
    dirs   = [String]
    lib_dirs [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    gcc_dirs
         gcc :: Bool
    gcc    = Bool
    False
         user :: Bool
    user   = Bool
    True

         obj_file :: String
    obj_file
           | Bool
    is_hs Bool -> Bool -> Bool
    && Bool
    loading_profiled_hs_libs = String
    lib String -> String -> String
    <.> String
    "p_o"
           | Bool
    otherwise = String
    lib String -> String -> String
    <.> String
    "o"
         dyn_obj_file :: String
    dyn_obj_file = String
    lib String -> String -> String
    <.> String
    "dyn_o"
         arch_files :: [String]
    arch_files = [ String
    "lib" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lib String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lib_tag String -> String -> String
    <.> String
    "a"
                      , String
    lib String -> String -> String
    <.> String
    "a" -- native code has no lib_tag
                      , String
    "lib" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lib, String
    lib
                      ]
         lib_tag :: String
    lib_tag = if Bool
    is_hs Bool -> Bool -> Bool
    && Bool
    loading_profiled_hs_libs then String
    "_p" else String
    ""

         loading_profiled_hs_libs :: Bool
    loading_profiled_hs_libs = Interp -> Bool
    interpreterProfiled Interp
    interp
         loading_dynamic_hs_libs :: Bool
    loading_dynamic_hs_libs  = Interp -> Bool
    interpreterDynamic  Interp
    interp

         import_libs :: [String]
    import_libs  = [ String
    lib String -> String -> String
    <.> String
    "lib"           , String
    "lib" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lib String -> String -> String
    <.> String
    "lib"
                        , String
    "lib" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    lib String -> String -> String
    <.> String
    "dll.a", String
    lib String -> String -> String
    <.> String
    "dll.a"
                        ]

         hs_dyn_lib_name :: String
    hs_dyn_lib_name = String
    lib String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ GhcNameVersion -> String
    dynLibSuffix (DynFlags -> GhcNameVersion
    ghcNameVersion DynFlags
    dflags)
         hs_dyn_lib_file :: String
    hs_dyn_lib_file = Platform -> String -> String
    platformHsSOName Platform
    platform String
    hs_dyn_lib_name

    #if defined(CAN_LOAD_DLL)
         so_name :: String
    so_name     = Platform -> String -> String
    platformSOName Platform
    platform String
    lib
         lib_so_name :: String
    lib_so_name = String
    "lib" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    so_name
         dyn_lib_file :: String
    dyn_lib_file = case (Arch
    arch, OS
    os) of
                                 (Arch
    ArchX86_64, OS
    OSSolaris2) -> String
    "64" String -> String -> String
    </> String
    so_name
                                 (Arch, OS)
    _ -> String
    so_name
    #endif

         findObject :: IO (Maybe LibrarySpec)
    findObject    = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec)
    -> (String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> a -> b
    $ [String] -> LibrarySpec
    Objects ([String] -> LibrarySpec)
    -> (String -> [String]) -> String -> LibrarySpec
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (String -> [String] -> [String]
    forall a. a -> [a] -> [a]
    :[]))  (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ [String] -> String -> IO (Maybe String)
    findFile [String]
    dirs String
    obj_file
         findDynObject :: IO (Maybe LibrarySpec)
    findDynObject = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec)
    -> (String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> a -> b
    $ [String] -> LibrarySpec
    Objects ([String] -> LibrarySpec)
    -> (String -> [String]) -> String -> LibrarySpec
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . (String -> [String] -> [String]
    forall a. a -> [a] -> [a]
    :[]))  (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ [String] -> String -> IO (Maybe String)
    findFile [String]
    dirs String
    dyn_obj_file
         findArchive :: IO (Maybe LibrarySpec)
    findArchive   = let local :: String -> IO (Maybe LibrarySpec)
    local String
    name = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap String -> LibrarySpec
    Archive) (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ [String] -> String -> IO (Maybe String)
    findFile [String]
    dirs String
    name
                         in  [IO (Maybe LibrarySpec)] -> IO (Maybe LibrarySpec)
    forall a. [IO (Maybe a)] -> IO (Maybe a)
    apply ((String -> IO (Maybe LibrarySpec))
    -> [String] -> [IO (Maybe LibrarySpec)]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> IO (Maybe LibrarySpec)
    local [String]
    arch_files)
         findHSDll :: IO (Maybe LibrarySpec)
    findHSDll     = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap String -> LibrarySpec
    DLLPath) (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ [String] -> String -> IO (Maybe String)
    findFile [String]
    dirs String
    hs_dyn_lib_file
    #if defined(CAN_LOAD_DLL)
         findDll :: Bool -> IO (Maybe LibrarySpec)
    findDll    Bool
    re = let dirs' :: [String]
    dirs' = if Bool
    re Bool -> Bool -> Bool
    forall a. Eq a => a -> a -> Bool
    == Bool
    user then [String]
    lib_dirs else [String]
    gcc_dirs
                         in (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap String -> LibrarySpec
    DLLPath) (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ [String] -> String -> IO (Maybe String)
    findFile [String]
    dirs' String
    dyn_lib_file
         findSysDll :: IO (Maybe LibrarySpec)
    findSysDll    = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> IO a -> IO b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec)
    -> (String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> a -> b
    $ String -> LibrarySpec
    DLL (String -> LibrarySpec)
    -> (String -> String) -> String -> LibrarySpec
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . String -> String
    dropExtension (String -> String) -> (String -> String) -> String -> String
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    . String -> String
    takeFileName) (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $
                            Interp -> String -> IO (Maybe String)
    findSystemLibrary Interp
    interp String
    so_name
    #endif
         tryGcc :: IO (Maybe LibrarySpec)
    tryGcc        = let search :: String -> [String] -> IO (Maybe String)
    search   = Logger -> DynFlags -> String -> [String] -> IO (Maybe String)
    searchForLibUsingGcc Logger
    logger DynFlags
    dflags
    #if defined(CAN_LOAD_DLL)
                             dllpath :: IO (Maybe String) -> IO (Maybe LibrarySpec)
    dllpath  = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap String -> LibrarySpec
    DLLPath)
                             short :: IO (Maybe LibrarySpec)
    short    = IO (Maybe String) -> IO (Maybe LibrarySpec)
    dllpath (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ String -> [String] -> IO (Maybe String)
    search String
    so_name [String]
    lib_dirs
                             full :: IO (Maybe LibrarySpec)
    full     = IO (Maybe String) -> IO (Maybe LibrarySpec)
    dllpath (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ String -> [String] -> IO (Maybe String)
    search String
    lib_so_name [String]
    lib_dirs
                             dlls :: [IO (Maybe LibrarySpec)]
    dlls     = [IO (Maybe LibrarySpec)
    short, IO (Maybe LibrarySpec)
    full]
    #endif
                             gcc :: String -> IO (Maybe LibrarySpec)
    gcc String
    name = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap String -> LibrarySpec
    Archive) (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $ String -> [String] -> IO (Maybe String)
    search String
    name [String]
    lib_dirs
                             files :: [String]
    files    = [String]
    import_libs [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    arch_files
                             archives :: [IO (Maybe LibrarySpec)]
    archives = (String -> IO (Maybe LibrarySpec))
    -> [String] -> [IO (Maybe LibrarySpec)]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> IO (Maybe LibrarySpec)
    gcc [String]
    files
                         in [IO (Maybe LibrarySpec)] -> IO (Maybe LibrarySpec)
    forall a. [IO (Maybe a)] -> IO (Maybe a)
    apply ([IO (Maybe LibrarySpec)] -> IO (Maybe LibrarySpec))
    -> [IO (Maybe LibrarySpec)] -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $
    #if defined(CAN_LOAD_DLL)
                              [IO (Maybe LibrarySpec)]
    dlls [IO (Maybe LibrarySpec)]
    -> [IO (Maybe LibrarySpec)] -> [IO (Maybe LibrarySpec)]
    forall a. [a] -> [a] -> [a]
    ++
    #endif
                              [IO (Maybe LibrarySpec)]
    archives
         tryImpLib :: Bool -> IO (Maybe LibrarySpec)
    tryImpLib Bool
    re = case OS
    os of
                           OS
    OSMinGW32 ->
                            let dirs' :: [String]
    dirs' = if Bool
    re Bool -> Bool -> Bool
    forall a. Eq a => a -> a -> Bool
    == Bool
    user then [String]
    lib_dirs else [String]
    gcc_dirs
                                implib :: String -> IO (Maybe LibrarySpec)
    implib String
    name = (Maybe String -> Maybe LibrarySpec)
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
    liftM ((String -> LibrarySpec) -> Maybe String -> Maybe LibrarySpec
    forall a b. (a -> b) -> Maybe a -> Maybe b
    forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
    fmap String -> LibrarySpec
    Archive) (IO (Maybe String) -> IO (Maybe LibrarySpec))
    -> IO (Maybe String) -> IO (Maybe LibrarySpec)
    forall a b. (a -> b) -> a -> b
    $
                                                [String] -> String -> IO (Maybe String)
    findFile [String]
    dirs' String
    name
                            in [IO (Maybe LibrarySpec)] -> IO (Maybe LibrarySpec)
    forall a. [IO (Maybe a)] -> IO (Maybe a)
    apply ((String -> IO (Maybe LibrarySpec))
    -> [String] -> [IO (Maybe LibrarySpec)]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> IO (Maybe LibrarySpec)
    implib [String]
    import_libs)
                           OS
    _         -> Maybe LibrarySpec -> IO (Maybe LibrarySpec)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe LibrarySpec
    forall a. Maybe a
    Nothing

         -- TH Makes use of the interpreter so this failure is not obvious.
         -- So we are nice and warn/inform users why we fail before we do.
         -- But only for haskell libraries, as C libraries don't have a
         -- profiling/non-profiling distinction to begin with.
         assumeDll :: IO LibrarySpec
    assumeDll
          | Bool
    is_hs
          , Bool -> Bool
    not Bool
    loading_dynamic_hs_libs
          , Interp -> Bool
    interpreterProfiled Interp
    interp
          = do
              let diag :: MessageClass
    diag = DiagOpts -> DiagnosticReason -> MessageClass
    mkMCDiagnostic DiagOpts
    diag_opts DiagnosticReason
    WarningWithoutFlag
              Logger -> MessageClass -> SrcSpan -> SDoc -> IO ()
    logMsg Logger
    logger MessageClass
    diag SrcSpan
    noSrcSpan (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $ PprStyle -> SDoc -> SDoc
    withPprStyle PprStyle
    defaultErrStyle (SDoc -> SDoc) -> SDoc -> SDoc
    forall a b. (a -> b) -> a -> b
    $
                String -> SDoc
    text String
    "Interpreter failed to load profiled static library" SDoc -> SDoc -> SDoc
    <+> String -> SDoc
    text String
    lib SDoc -> SDoc -> SDoc
    <> Char -> SDoc
    char Char
    '.' SDoc -> SDoc -> SDoc
    $$
                  String -> SDoc
    text String
    " \tTrying dynamic library instead. If this fails try to rebuild" SDoc -> SDoc -> SDoc
    <+>
                  String -> SDoc
    text String
    "libraries with profiling support."
              LibrarySpec -> IO LibrarySpec
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (String -> LibrarySpec
    DLL String
    lib)
          | Bool
    otherwise = LibrarySpec -> IO LibrarySpec
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (String -> LibrarySpec
    DLL String
    lib)
         infixr `orElse`
         m (Maybe b)
    f orElse :: m (Maybe b) -> m b -> m b
    `orElse` m b
    g = m (Maybe b)
    f m (Maybe b) -> (Maybe b -> m b) -> m b
    forall a b. m a -> (a -> m b) -> m b
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= m b -> (b -> m b) -> Maybe b -> m b
    forall b a. b -> (a -> b) -> Maybe a -> b
    maybe m b
    g b -> m b
    forall a. a -> m a
    forall (m :: * -> *) a. Monad m => a -> m a
    return

         apply :: [IO (Maybe a)] -> IO (Maybe a)
         apply :: forall a. [IO (Maybe a)] -> IO (Maybe a)
    apply []     = Maybe a -> IO (Maybe a)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe a
    forall a. Maybe a
    Nothing
         apply (IO (Maybe a)
    x:[IO (Maybe a)]
    xs) = do Maybe a
    x' <- IO (Maybe a)
    x
                           if Maybe a -> Bool
    forall a. Maybe a -> Bool
    isJust Maybe a
    x'
                              then Maybe a -> IO (Maybe a)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe a
    x'
                              else [IO (Maybe a)] -> IO (Maybe a)
    forall a. [IO (Maybe a)] -> IO (Maybe a)
    apply [IO (Maybe a)]
    xs

         platform :: Platform
    platform = DynFlags -> Platform
    targetPlatform DynFlags
    dflags
    #if defined(CAN_LOAD_DLL)
         arch :: Arch
    arch = Platform -> Arch
    platformArch Platform
    platform
    #endif
         os :: OS
    os = Platform -> OS
    platformOS Platform
    platform

    searchForLibUsingGcc :: Logger -> DynFlags -> String -> [FilePath] -> IO (Maybe FilePath)
    searchForLibUsingGcc :: Logger -> DynFlags -> String -> [String] -> IO (Maybe String)
    searchForLibUsingGcc Logger
    logger DynFlags
    dflags String
    so [String]
    dirs = do
       -- GCC does not seem to extend the library search path (using -L) when using
       -- --print-file-name. So instead pass it a new base location.
       String
    str <- Logger -> DynFlags -> [Option] -> IO String
    askLd Logger
    logger DynFlags
    dflags ((String -> Option) -> [String] -> [Option]
    forall a b. (a -> b) -> [a] -> [b]
    map (String -> String -> Option
    FileOption String
    "-B") [String]
    dirs
                              [Option] -> [Option] -> [Option]
    forall a. [a] -> [a] -> [a]
    ++ [String -> Option
    Option String
    "--print-file-name", String -> Option
    Option String
    so])
       let file :: String
    file = case String -> [String]
    lines String
    str of
                    []  -> String
    ""
                    String
    l:[String]
    _ -> String
    l
       if (String
    file String -> String -> Bool
    forall a. Eq a => a -> a -> Bool
    == String
    so)
          then Maybe String -> IO (Maybe String)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return Maybe String
    forall a. Maybe a
    Nothing
          else do Bool
    b <- String -> IO Bool
    doesFileExist String
    file -- file could be a folder (see #16063)
                  Maybe String -> IO (Maybe String)
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return (if Bool
    b then String -> Maybe String
    forall a. a -> Maybe a
    Just String
    file else Maybe String
    forall a. Maybe a
    Nothing)

    -- | Retrieve the list of search directory GCC and the System use to find
    --   libraries and components. See Note [Fork/Exec Windows].
    getGCCPaths :: Logger -> DynFlags -> OS -> IO [FilePath]
    getGCCPaths :: Logger -> DynFlags -> OS -> IO [String]
    getGCCPaths Logger
    logger DynFlags
    dflags OS
    os
      = case OS
    os of
          OS
    OSMinGW32 ->
            do [String]
    gcc_dirs <- Logger -> DynFlags -> String -> IO [String]
    getGccSearchDirectory Logger
    logger DynFlags
    dflags String
    "libraries"
               [String]
    sys_dirs <- IO [String]
    getSystemDirectories
               [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([String] -> IO [String]) -> [String] -> IO [String]
    forall a b. (a -> b) -> a -> b
    $ [String] -> [String]
    forall a. Eq a => [a] -> [a]
    nub ([String] -> [String]) -> [String] -> [String]
    forall a b. (a -> b) -> a -> b
    $ [String]
    gcc_dirs [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    sys_dirs
          OS
    _         -> [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return []

    -- | Cache for the GCC search directories as this can't easily change
    --   during an invocation of GHC. (Maybe with some env. variable but we'll)
    --   deal with that highly unlikely scenario then.
    {-# NOINLINE gccSearchDirCache #-}
    gccSearchDirCache :: IORef [(String, [String])]
    gccSearchDirCache :: IORef [(String, [String])]
    gccSearchDirCache = IO (IORef [(String, [String])]) -> IORef [(String, [String])]
    forall a. IO a -> a
    unsafePerformIO (IO (IORef [(String, [String])]) -> IORef [(String, [String])])
    -> IO (IORef [(String, [String])]) -> IORef [(String, [String])]
    forall a b. (a -> b) -> a -> b
    $ [(String, [String])] -> IO (IORef [(String, [String])])
    forall a. a -> IO (IORef a)
    newIORef []

    -- Note [Fork/Exec Windows]
    -- ~~~~~~~~~~~~~~~~~~~~~~~~
    -- fork/exec is expensive on Windows, for each time we ask GCC for a library we
    -- have to eat the cost of af least 3 of these: gcc -> real_gcc -> cc1.
    -- So instead get a list of location that GCC would search and use findDirs
    -- which hopefully is written in an optimized mannor to take advantage of
    -- caching. At the very least we remove the overhead of the fork/exec and waits
    -- which dominate a large percentage of startup time on Windows.
    getGccSearchDirectory :: Logger -> DynFlags -> String -> IO [FilePath]
    getGccSearchDirectory :: Logger -> DynFlags -> String -> IO [String]
    getGccSearchDirectory Logger
    logger DynFlags
    dflags String
    key = do
        [(String, [String])]
    cache <- IORef [(String, [String])] -> IO [(String, [String])]
    forall a. IORef a -> IO a
    readIORef IORef [(String, [String])]
    gccSearchDirCache
        case String -> [(String, [String])] -> Maybe [String]
    forall a b. Eq a => a -> [(a, b)] -> Maybe b
    lookup String
    key [(String, [String])]
    cache of
          Just [String]
    x  -> [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return [String]
    x
          Maybe [String]
    Nothing -> do
            String
    str <- Logger -> DynFlags -> [Option] -> IO String
    askLd Logger
    logger DynFlags
    dflags [String -> Option
    Option String
    "--print-search-dirs"]
            let line :: String
    line = (Char -> Bool) -> String -> String
    forall a. (a -> Bool) -> [a] -> [a]
    dropWhile Char -> Bool
    isSpace String
    str
                name :: String
    name = String
    key String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    ": ="
            if String -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null String
    line
              then [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return []
              else do let val :: [String]
    val = String -> [String]
    split (String -> [String]) -> String -> [String]
    forall a b. (a -> b) -> a -> b
    $ String -> String -> String
    find String
    name String
    line
                      [String]
    dirs <- (String -> IO Bool) -> [String] -> IO [String]
    forall (m :: * -> *) a.
    Applicative m =>
    (a -> m Bool) -> [a] -> m [a]
    filterM String -> IO Bool
    doesDirectoryExist [String]
    val
                      IORef [(String, [String])]
    -> ([(String, [String])] -> [(String, [String])]) -> IO ()
    forall a. IORef a -> (a -> a) -> IO ()
    modifyIORef' IORef [(String, [String])]
    gccSearchDirCache ((String
    key, [String]
    dirs)(String, [String]) -> [(String, [String])] -> [(String, [String])]
    forall a. a -> [a] -> [a]
    :)
                      [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return [String]
    val
          where split :: FilePath -> [FilePath]
                split :: String -> [String]
    split String
    r = case (Char -> Bool) -> String -> (String, String)
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    break (Char -> Char -> Bool
    forall a. Eq a => a -> a -> Bool
    ==Char
    ';') String
    r of
                            (String
    s, []    ) -> [String
    s]
                            (String
    s, (Char
    _:String
    xs)) -> String
    s String -> [String] -> [String]
    forall a. a -> [a] -> [a]
    : String -> [String]
    split String
    xs

                find :: String -> String -> String
                find :: String -> String -> String
    find String
    r String
    x = let lst :: [String]
    lst = String -> [String]
    lines String
    x
                               val :: [String]
    val = (String -> Bool) -> [String] -> [String]
    forall a. (a -> Bool) -> [a] -> [a]
    filter (String
    r String -> String -> Bool
    forall a. Eq a => [a] -> [a] -> Bool
    `isPrefixOf`) [String]
    lst
                           in if [String] -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null [String]
    val
                                 then []
                                 else case (Char -> Bool) -> String -> (String, String)
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    break (Char -> Char -> Bool
    forall a. Eq a => a -> a -> Bool
    ==Char
    '=') ([String] -> String
    forall a. HasCallStack => [a] -> a
    head [String]
    val) of
                                         (String
    _ , [])    -> []
                                         (String
    _, (Char
    _:String
    xs)) -> String
    xs

    -- | Get a list of system search directories, this to alleviate pressure on
    -- the findSysDll function.
    getSystemDirectories :: IO [FilePath]
    #if defined(mingw32_HOST_OS)
    getSystemDirectories = fmap (:[]) getSystemDirectory
    #else
    getSystemDirectories :: IO [String]
    getSystemDirectories = [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return []
    #endif

    -- | Merge the given list of paths with those in the environment variable
    --   given. If the variable does not exist then just return the identity.
    addEnvPaths :: String -> [String] -> IO [String]
    addEnvPaths :: String -> [String] -> IO [String]
    addEnvPaths String
    name [String]
    list
      = do -- According to POSIX (chapter 8.3) a zero-length prefix means current
           -- working directory. Replace empty strings in the env variable with
           -- `working_dir` (see also #14695).
           String
    working_dir <- IO String
    getCurrentDirectory
           Maybe String
    values <- String -> IO (Maybe String)
    lookupEnv String
    name
           case Maybe String
    values of
             Maybe String
    Nothing  -> [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return [String]
    list
             Just String
    arr -> [String] -> IO [String]
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return ([String] -> IO [String]) -> [String] -> IO [String]
    forall a b. (a -> b) -> a -> b
    $ [String]
    list [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ String -> String -> [String]
    splitEnv String
    working_dir String
    arr
        where
          splitEnv :: FilePath -> String -> [String]
          splitEnv :: String -> String -> [String]
    splitEnv String
    working_dir String
    value =
            case (Char -> Bool) -> String -> (String, String)
    forall a. (a -> Bool) -> [a] -> ([a], [a])
    break (Char -> Char -> Bool
    forall a. Eq a => a -> a -> Bool
    == Char
    envListSep) String
    value of
              (String
    x, []    ) ->
                [if String -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null String
    x then String
    working_dir else String
    x]
              (String
    x, (Char
    _:String
    xs)) ->
                (if String -> Bool
    forall a. [a] -> Bool
    forall (t :: * -> *) a. Foldable t => t a -> Bool
    null String
    x then String
    working_dir else String
    x) String -> [String] -> [String]
    forall a. a -> [a] -> [a]
    : String -> String -> [String]
    splitEnv String
    working_dir String
    xs
    #if defined(mingw32_HOST_OS)
          envListSep = ';'
    #else
          envListSep :: Char
    envListSep = Char
    ':'
    #endif

    -- ----------------------------------------------------------------------------
    -- Loading a dynamic library (dlopen()-ish on Unix, LoadLibrary-ish on Win32)

    {- **********************************************************************

                    Helper functions

      ********************************************************************* -}

    maybePutSDoc :: Logger -> SDoc -> IO ()
    maybePutSDoc :: Logger -> SDoc -> IO ()
    maybePutSDoc Logger
    logger SDoc
    s
        = Bool -> IO () -> IO ()
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
    when (Logger -> Int -> Bool
    logVerbAtLeast Logger
    logger Int
    2) (IO () -> IO ()) -> IO () -> IO ()
    forall a b. (a -> b) -> a -> b
    $
              Logger -> MessageClass -> SrcSpan -> SDoc -> IO ()
    logMsg Logger
    logger
                  MessageClass
    MCInteractive
                  SrcSpan
    noSrcSpan
                  (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $ PprStyle -> SDoc -> SDoc
    withPprStyle PprStyle
    defaultUserStyle SDoc
    s

    maybePutStr :: Logger -> String -> IO ()
    maybePutStr :: Logger -> String -> IO ()
    maybePutStr Logger
    logger String
    s = Logger -> SDoc -> IO ()
    maybePutSDoc Logger
    logger (String -> SDoc
    text String
    s)

    maybePutStrLn :: Logger -> String -> IO ()
    maybePutStrLn :: Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    s = Logger -> SDoc -> IO ()
    maybePutSDoc Logger
    logger (String -> SDoc
    text String
    s SDoc -> SDoc -> SDoc
    <> String -> SDoc
    text String
    "\n")