    {-# LANGUAGE CPP #-}
    {-# LANGUAGE RecordWildCards #-}
    {-# 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
       -- * Internals
       , rmDupLinkables
       , modifyLoaderState
       , initLinkDepsOpts
       , partitionLinkable
       )
    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.Diagnostic
    import GHC.Driver.Config.Finder

    import GHC.Tc.Utils.Monad

    import GHC.Runtime.Interpreter
    import GHCi.RemoteTypes
    import GHC.Iface.Load
    import GHCi.Message (LoadedDLL)

    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.Error
    import GHC.Utils.Logger
    import GHC.Utils.TmpFs

    import GHC.Unit.Env
    import GHC.Unit.Module
    import GHC.Unit.State as Packages

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

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

    -- Standard libraries
    import Control.Monad

    import qualified Data.Set as Set
    import Data.Char (isSpace)
    import Data.IORef
    import Data.List (intercalate, isPrefixOf, 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

    -- Note [Linkers and loaders]
    -- ~~~~~~~~~~~~~~~~~~~~~~~~~~
    --
    -- Linkers are used to produce linked objects (.so, executables); loaders are
    -- used to link in memory (e.g., in GHCi) with the already loaded libraries
    -- (ghc-lib, rts, etc.).
    --
    -- Linking can usually be done with an external linker program ("ld"), but
    -- loading is more tricky:
    --
    --    * Fully dynamic:
    --       when GHC is built as a set of dynamic libraries (ghc-lib, rts, etc.)
    --       and the modules to load are also compiled for dynamic linking, a
    --       solution is to fully rely on external tools:
    --
    --       1) link a .so with the external linker
    --       2) load the .so with POSIX's "dlopen"
    --
    --    * When GHC is built as a static program or when libraries we want to load
    --    aren't compiled for dynamic linking, GHC uses its own loader ("runtime
    --    linker"). The runtime linker is part of the rts (rts/Linker.c).
    --
    -- Note that within GHC's codebase we often use the word "linker" to refer to
    -- the static object loader in the runtime system.
    --
    -- Loading can be delegated to an external interpreter ("iserv") when
    -- -fexternal-interpreter is used.

    uninitialised :: a
    uninitialised :: forall a. a
    uninitialised = String -> a
    forall a. HasCallStack => 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
       { linker_env :: LinkerEnv
    linker_env = LinkerEnv
         { closure_env :: ClosureEnv
    closure_env = ClosureEnv
    forall a. NameEnv a
    emptyNameEnv
         , itbl_env :: ItblEnv
    itbl_env    = ItblEnv
    forall a. NameEnv a
    emptyNameEnv
         , addr_env :: AddrEnv
    addr_env    = AddrEnv
    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]
    -> [RemotePtr LoadedDLL]
    -> 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
    $ \LoaderState
    pls -> do
        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 -> (ClosureEnv -> ClosureEnv) -> LoaderState
    modifyClosureEnv LoaderState
    pls ((ClosureEnv -> ClosureEnv) -> LoaderState)
    -> (ClosureEnv -> ClosureEnv) -> LoaderState
    forall a b. (a -> b) -> a -> b
    $ \ClosureEnv
    ce ->
          ClosureEnv -> [(Name, ForeignHValue)] -> ClosureEnv
    extendClosureEnv ClosureEnv
    ce [(Name, ForeignHValue)]
    new_bindings
        -- 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
        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 -> (ClosureEnv -> ClosureEnv) -> LoaderState
    modifyClosureEnv LoaderState
    pls ((ClosureEnv -> ClosureEnv) -> LoaderState)
    -> (ClosureEnv -> ClosureEnv) -> LoaderState
    forall a b. (a -> b) -> a -> b
    $ \ClosureEnv
    ce ->
          ClosureEnv -> [Name] -> ClosureEnv
    forall a. NameEnv a -> [Name] -> NameEnv a
    delListFromNameEnv ClosureEnv
    ce [Name]
    to_remove

    -- | 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
        (pls, links, 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 {k} (key :: k) elt. UniqDFM key elt
    emptyUDFM)
           else do
             (pls', ok, links, pkgs) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls0 SrcSpan
    noSrcSpan
                                          [HasDebugCallStack => Name -> Module
    Name -> Module
    nameModule Name
    name]
             if failed ok
               then throwGhcExceptionIO (ProgramError "")
               else return (pls', links, pkgs)

        case lookupNameEnv (closure_env (linker_env pls)) 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"
                            m <- Interp -> String -> IO (Maybe HValueRef)
    lookupClosure Interp
    interp (FastString -> String
    unpackFS FastString
    sym_to_find)
                            r <- case 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)
                            return (pls,(r, links, pkgs))

    loadDependencies
      :: Interp
      -> HscEnv
      -> LoaderState
      -> SrcSpan
      -> [Module]
      -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded) -- ^ returns the set of linkables required
    -- When called, the loader state must have been initialized (see `initLoaderState`)
    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
       let opts :: LinkDepsOpts
    opts = HscEnv -> LinkDepsOpts
    initLinkDepsOpts HscEnv
    hsc_env

       -- Find what packages and linkables are required
       deps <- LinkDepsOpts
    -> Interp -> LoaderState -> SrcSpan -> [Module] -> IO LinkDeps
    getLinkDeps LinkDepsOpts
    opts Interp
    interp LoaderState
    pls SrcSpan
    span [Module]
    needed_mods

       let this_pkgs_needed = LinkDeps -> UniqDSet UnitId
    ldNeededUnits LinkDeps
    deps

       -- Link the packages and modules required
       pls1 <- loadPackages' interp hsc_env (ldUnits deps) pls
       (pls2, succ) <- loadModuleLinkables interp hsc_env pls1 (ldNeededLinkables deps)
       let this_pkgs_loaded = PkgsLoaded -> UniqDFM UnitId UnitId -> PkgsLoaded
    forall {k} (key :: k) 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 = LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls2
           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]
                                                                      ])
       return (pls2, succ, ldAllLinkables deps, 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.
    (HasCallStack, 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 -> [Name] -> IO ()
    deleteFromLoadedEnv Interp
    interp (((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)

    -- | Display the loader state.
    showLoaderState :: Interp -> IO SDoc
    showLoaderState :: Interp -> IO SDoc
    showLoaderState Interp
    interp = do
      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 = case Maybe LoaderState
    ls of
            Maybe LoaderState
    Nothing  -> [ String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "Loader not initialised"]
            Just LoaderState
    pls -> [ String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "Pkgs:" SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <+> [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 {k} (key :: k) 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
    forall doc. IsLine doc => String -> doc
    text String
    "Objs:" SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <+> [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
    forall doc. IsLine doc => String -> doc
    text String
    "BCOs:" SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <+> [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)
                        ]

      return $ withPprStyle defaultDumpStyle
             $ vcat (text "----- Loader state -----":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

      case Platform -> Arch
    platformArch (DynFlags -> Platform
    targetPlatform (HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env)) of
        -- FIXME: we don't initialize anything with the JS interpreter.
        -- Perhaps we should load preload packages. We'll load them on demand
        -- anyway.
        Arch
    ArchJavaScript -> LoaderState -> IO LoaderState
    forall a. a -> IO a
    forall (m :: * -> *) a. Monad m => a -> m a
    return LoaderState
    pls0

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

          -- (b) Load packages from the command-line (Note [preload packages])
          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 (HasDebugCallStack => 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)
          loadCmdLineLibs' interp hsc_env 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' = HasDebugCallStack => UnitId -> HscEnv -> HscEnv
    UnitId -> HscEnv -> HscEnv
    hscSetActiveUnitId UnitId
    uid HscEnv
    hsc_env
          -- Load potential dependencies first
          (done', 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 (HasDebugCallStack => HscEnv -> UnitState
    HscEnv -> UnitState
    hsc_units HscEnv
    hsc'))
          pls'' <- loadCmdLineLibs'' interp hsc' pls'
          return $ (Set.insert uid done', 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]
          gcc_paths <- Logger -> DynFlags -> OS -> IO [String]
    getGCCPaths Logger
    logger DynFlags
    dflags OS
    os

          lib_paths_env <- addEnvPaths "LIBRARY_PATH" lib_paths_base

          maybePutStrLn logger "Search directories (user):"
          maybePutStr logger (unlines $ map ("  "++) lib_paths_env)
          maybePutStrLn logger "Search directories (gcc):"
          maybePutStr logger (unlines $ map ("  "++) gcc_paths)

          libspecs
            <- mapM (locateLib interp hsc_env False lib_paths_env gcc_paths) minus_ls

          -- (d) Link .o files from the command-line
          classified_ld_inputs <- mapM (classifyLdInput logger platform)
                                    [ f | FileOption _ f <- cmdline_ld_inputs ]

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

          -- Finally do (c),(d),(e)
          let 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 null cmdline_lib_specs
             then return 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 = 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] -> [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
               all_paths_env <- addEnvPaths "LD_LIBRARY_PATH" all_paths
               pathCache <- mapM (addLibrarySearchPath interp) all_paths_env

               let merged_specs = [LibrarySpec] -> [LibrarySpec]
    mergeStaticObjects [LibrarySpec]
    cmdline_lib_specs
               pls1 <- foldM (preloadLib interp hsc_env lib_paths framework_paths) pls
                             merged_specs

               maybePutStr logger "final link ... "
               ok <- resolveObjs interp

               -- DLLs are loaded, reset the search paths
               mapM_ (removeLibrarySearchPath interp) $ reverse pathCache

               if succeeded ok then maybePutStrLn logger "done"
               else throwGhcExceptionIO (ProgramError "linking extra libraries/objects failed")

               return 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
    forall doc. IsLine doc => String -> doc
    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
          (b, pls1) <- [String] -> [String] -> IO (Bool, LoaderState)
    preload_statics [String]
    lib_paths [String]
    static_ishs
          maybePutStrLn logger (if b  then "done" else "not found")
          return pls1

        Archive String
    static_ish -> do
          b <- [String] -> String -> IO Bool
    preload_static_archive [String]
    lib_paths String
    static_ish
          maybePutStrLn logger (if b  then "done" else "not found")
          return pls

        DLL String
    dll_unadorned -> do
          maybe_errstr <- Interp -> String -> IO (Either String (RemotePtr LoadedDLL))
    loadDLL Interp
    interp (Platform -> String -> String
    platformSOName Platform
    platform String
    dll_unadorned)
          case maybe_errstr of
             Right RemotePtr LoadedDLL
    _ -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
             Left 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
             Left 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"
               err2 <- Interp -> String -> IO (Either String (RemotePtr LoadedDLL))
    loadDLL Interp
    interp String
    libfile
               case err2 of
                 Right RemotePtr LoadedDLL
    _ -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
                 Left String
    _  -> String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    mm [String]
    lib_paths LibrarySpec
    lib_spec
          return pls

        DLLPath String
    dll_path -> do
          do maybe_errstr <- Interp -> String -> IO (Either String (RemotePtr LoadedDLL))
    loadDLL Interp
    interp String
    dll_path
             case maybe_errstr of
                Right RemotePtr LoadedDLL
    _ -> Logger -> String -> IO ()
    maybePutStrLn Logger
    logger String
    "done"
                Left String
    mm -> String -> [String] -> LibrarySpec -> IO ()
    preloadFailed String
    mm [String]
    lib_paths LibrarySpec
    lib_spec
             return pls

        Framework String
    framework ->
          if Platform -> Bool
    platformUsesFrameworks (DynFlags -> Platform
    targetPlatform DynFlags
    dflags)
          then do maybe_errstr <- Interp -> [String] -> String -> IO (Maybe String)
    loadFramework Interp
    interp [String]
    framework_paths String
    framework
                  case 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
                  return 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 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 not b then return (False, pls)
                         else if hostIsDynamic
                                 then  do pls1 <- dynLoadObjs interp hsc_env pls names
                                          return (True, pls1)
                                 else  do mapM_ (loadObj interp) names
                                          return (True, pls)

        preload_static_archive :: [String] -> String -> IO Bool
    preload_static_archive [String]
    _paths String
    name
           = do b <- String -> IO Bool
    doesFileExist String
    name
                if not b then return False
                         else do if hostIsDynamic
                                     then throwGhcExceptionIO $
                                          CmdLineError dynamic_msg
                                     else loadArchive interp name
                                 return 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
        (pls, ok, _, _) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls0 SrcSpan
    span [Module]
    needed_mods
        if failed ok
          then throwGhcExceptionIO (ProgramError "")
          else do
            -- Load the expression itself
            -- Load the necessary packages and linkables
            let le = LoaderState -> LinkerEnv
    linker_env LoaderState
    pls
                bco_ix = [(Name, Int)] -> NameEnv Int
    forall a. [(Name, a)] -> NameEnv a
    mkNameEnv [(UnlinkedBCO -> Name
    unlinkedBCOName UnlinkedBCO
    root_ul_bco, Int
    0)]
            resolved <- linkBCO interp (pkgs_loaded pls) le bco_ix root_ul_bco
            [root_hvref] <- createBCOs interp [resolved]
            fhv <- mkFinalizedHValue interp root_hvref
            return (pls, 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 = [ HasDebugCallStack => 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.

    initLinkDepsOpts :: HscEnv -> LinkDepsOpts
    initLinkDepsOpts :: HscEnv -> LinkDepsOpts
    initLinkDepsOpts HscEnv
    hsc_env = LinkDepsOpts
    opts
      where
        opts :: LinkDepsOpts
    opts = LinkDepsOpts
                { ldObjSuffix :: String
    ldObjSuffix   = DynFlags -> String
    objectSuf DynFlags
    dflags
                , ldOneShotMode :: Bool
    ldOneShotMode = GhcMode -> Bool
    isOneShot (DynFlags -> GhcMode
    ghcMode DynFlags
    dflags)
                , ldModuleGraph :: ModuleGraph
    ldModuleGraph = HscEnv -> ModuleGraph
    hsc_mod_graph HscEnv
    hsc_env
                , ldUnitEnv :: UnitEnv
    ldUnitEnv     = HscEnv -> UnitEnv
    hsc_unit_env HscEnv
    hsc_env
                , ldLoadIface :: SDoc -> Module -> IO (MaybeErr MissingInterfaceError ModIface)
    ldLoadIface   = SDoc -> Module -> IO (MaybeErr MissingInterfaceError ModIface)
    load_iface
                , ldPprOpts :: SDocContext
    ldPprOpts     = DynFlags -> PprStyle -> SDocContext
    initSDocContext DynFlags
    dflags PprStyle
    defaultUserStyle
                , ldFinderCache :: FinderCache
    ldFinderCache = HscEnv -> FinderCache
    hsc_FC HscEnv
    hsc_env
                , ldFinderOpts :: FinderOpts
    ldFinderOpts  = DynFlags -> FinderOpts
    initFinderOpts DynFlags
    dflags
                , ldUseByteCode :: Bool
    ldUseByteCode = GeneralFlag -> DynFlags -> Bool
    gopt GeneralFlag
    Opt_UseBytecodeRatherThanObjects DynFlags
    dflags
                , ldMsgOpts :: DiagnosticOpts IfaceMessage
    ldMsgOpts     = DynFlags -> DiagnosticOpts IfaceMessage
    initIfaceMessageOpts DynFlags
    dflags
                , ldWays :: Ways
    ldWays        = DynFlags -> Ways
    ways DynFlags
    dflags
                }
        dflags :: DynFlags
    dflags = HscEnv -> DynFlags
    hsc_dflags HscEnv
    hsc_env
        load_iface :: SDoc -> Module -> IO (MaybeErr MissingInterfaceError ModIface)
    load_iface SDoc
    msg Module
    mod = SDoc
    -> HscEnv
    -> IfG (MaybeErr MissingInterfaceError ModIface)
    -> IO (MaybeErr MissingInterfaceError ModIface)
    forall a. SDoc -> HscEnv -> IfG a -> IO a
    initIfaceCheck (String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "loader") HscEnv
    hsc_env
                              (IfG (MaybeErr MissingInterfaceError ModIface)
     -> IO (MaybeErr MissingInterfaceError ModIface))
    -> IfG (MaybeErr MissingInterfaceError ModIface)
    -> IO (MaybeErr MissingInterfaceError ModIface)
    forall a b. (a -> b) -> a -> b
    $ SDoc
    -> Module
    -> WhereFrom
    -> IfG (MaybeErr MissingInterfaceError ModIface)
    forall lcl.
    SDoc
    -> Module
    -> WhereFrom
    -> IfM lcl (MaybeErr MissingInterfaceError ModIface)
    loadInterface SDoc
    msg Module
    mod (IsBootInterface -> WhereFrom
    ImportByUser IsBootInterface
    NotBoot)

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

                  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{[UnlinkedBCO]
    [FFIInfo]
    Maybe ModBreaks
    AddrEnv
    ItblEnv
    bc_bcos :: [UnlinkedBCO]
    bc_itbls :: ItblEnv
    bc_ffis :: [FFIInfo]
    bc_strs :: AddrEnv
    bc_breaks :: Maybe ModBreaks
    bc_breaks :: CompiledByteCode -> Maybe ModBreaks
    bc_strs :: CompiledByteCode -> AddrEnv
    bc_ffis :: CompiledByteCode -> [FFIInfo]
    bc_itbls :: CompiledByteCode -> ItblEnv
    bc_bcos :: CompiledByteCode -> [UnlinkedBCO]
    ..} = 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
          (pls, ok, links_needed, 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 failed ok
            then throwGhcExceptionIO (ProgramError "")
            else do
              -- Link the expression itself
              let le  = LoaderState -> LinkerEnv
    linker_env LoaderState
    pls
                  le2 = LinkerEnv
    le { itbl_env = plusNameEnv (itbl_env le) bc_itbls
                           , addr_env = plusNameEnv (addr_env le) bc_strs }

              -- Link the necessary packages and linkables
              new_bindings <- linkSomeBCOs interp (pkgs_loaded pls) le2 [cbc]
              nms_fhvs <- makeForeignNamedHValueRefs interp new_bindings
              let ce2  = ClosureEnv -> [(Name, ForeignHValue)] -> ClosureEnv
    extendClosureEnv (LinkerEnv -> ClosureEnv
    closure_env LinkerEnv
    le2) [(Name, ForeignHValue)]
    nms_fhvs
                  !pls2 = LoaderState
    pls { linker_env = le2 { closure_env = ce2 } }
              return (pls2, (nms_fhvs, links_needed, 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 = [ HasDebugCallStack => 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
        (pls', ok, _, _) <- Interp
    -> HscEnv
    -> LoaderState
    -> SrcSpan
    -> [Module]
    -> IO (LoaderState, SuccessFlag, [Linkable], PkgsLoaded)
    loadDependencies Interp
    interp HscEnv
    hsc_env LoaderState
    pls SrcSpan
    noSrcSpan [Module
    mod]
        if failed ok
          then throwGhcExceptionIO (ProgramError "could not load module")
          else return 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)

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

            if failed ok_flag then
                    return (pls1, Failed)
              else do
                    pls2 <- dynLinkBCOs interp pls1 bcos
                    return (pls2, 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=li_uls_obj},
                               Linkable
    li {linkableUnlinked=li_uls_bco}]
                ([Unlinked], [Unlinked])
    _ -> [Linkable
    li]

    linkableInSet :: Linkable -> LinkableSet -> Bool
    linkableInSet :: Linkable -> LinkableSet -> Bool
    linkableInSet Linkable
    l LinkableSet
    objs_loaded =
      case LinkableSet -> Module -> Maybe Linkable
    forall a. ModuleEnv a -> Module -> Maybe a
    lookupModuleEnv 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 = 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 pls2 <- Interp -> HscEnv -> LoaderState -> [String] -> IO LoaderState
    dynLoadObjs Interp
    interp HscEnv
    hsc_env LoaderState
    pls1 [String]
    wanted_objs
                        return (pls2, 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
                        ok <- Interp -> IO SuccessFlag
    resolveObjs Interp
    interp

                        -- If resolving failed, unload all our
                        -- object modules and carry on
                        if succeeded ok then
                                return (pls1, Succeeded)
                          else do
                                pls2 <- unload_wkr interp [] pls1
                                return (pls2, 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)]
    PkgsLoaded
    LinkableSet
    LinkerEnv
    linker_env :: LoaderState -> LinkerEnv
    pkgs_loaded :: LoaderState -> PkgsLoaded
    bcos_loaded :: LoaderState -> LinkableSet
    objs_loaded :: LoaderState -> LinkableSet
    temp_sos :: LoaderState -> [(String, String)]
    linker_env :: LinkerEnv
    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 ]
        (soFile, libPath , 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
    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 =
                               concatMap (\String
    l -> [ String -> Option
    Option (String
    "-l" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    l) ])
                                         (nub $ snd <$> temp_sos)
                            ++ 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 [])
                                         (nub $ fst <$> temp_sos)
                            ++ 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 [])
                                 minus_big_ls
                            -- See Note [-Xlinker -rpath vs -Wl,-rpath]
                            ++ map (\String
    l -> String -> Option
    Option (String
    "-l" String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    l)) 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_ = Set.singleton WayDyn,
                          outputFile_ = Just 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.
        linkDynLib logger tmpfs dflags2 unit_env objs (loaded_pkg_uid <$> eltsUDFM pkgs_loaded)

        -- if we got this far, extend the lifetime of the library file
        changeTempFilesLifetime tmpfs TFL_GhcSession [soFile]
        m <- loadDLL interp soFile
        case m of
          Right RemotePtr LoadedDLL
    _ -> 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 = (libPath, libName) : temp_sos }
          Left 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 :: Interp -> LoaderState -> [Linkable] -> IO LoaderState
    dynLinkBCOs :: Interp -> LoaderState -> [Linkable] -> IO LoaderState
    dynLinkBCOs 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 = 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 (t :: * -> *) a b. Foldable t => (a -> [b]) -> t a -> [b]
    concatMap Unlinked -> [CompiledByteCode]
    byteCodeOfObject [Unlinked]
    unlinkeds

                le1 :: LinkerEnv
    le1 = LoaderState -> LinkerEnv
    linker_env LoaderState
    pls
                ie2 :: ItblEnv
    ie2 = (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 (LinkerEnv -> ItblEnv
    itbl_env LinkerEnv
    le1) ((CompiledByteCode -> ItblEnv) -> [CompiledByteCode] -> [ItblEnv]
    forall a b. (a -> b) -> [a] -> [b]
    map CompiledByteCode -> ItblEnv
    bc_itbls [CompiledByteCode]
    cbcs)
                ae2 :: AddrEnv
    ae2 = (AddrEnv -> AddrEnv -> AddrEnv) -> AddrEnv -> [AddrEnv] -> AddrEnv
    forall a b. (a -> b -> b) -> b -> [a] -> b
    forall (t :: * -> *) a b.
    Foldable t =>
    (a -> b -> b) -> b -> t a -> b
    foldr AddrEnv -> AddrEnv -> AddrEnv
    forall a. NameEnv a -> NameEnv a -> NameEnv a
    plusNameEnv (LinkerEnv -> AddrEnv
    addr_env LinkerEnv
    le1) ((CompiledByteCode -> AddrEnv) -> [CompiledByteCode] -> [AddrEnv]
    forall a b. (a -> b) -> [a] -> [b]
    map CompiledByteCode -> AddrEnv
    bc_strs [CompiledByteCode]
    cbcs)
                le2 :: LinkerEnv
    le2 = LinkerEnv
    le1 { itbl_env = ie2, addr_env = ae2 }

            names_and_refs <- Interp
    -> PkgsLoaded
    -> LinkerEnv
    -> [CompiledByteCode]
    -> IO [(Name, HValueRef)]
    linkSomeBCOs Interp
    interp (LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls) LinkerEnv
    le2 [CompiledByteCode]
    cbcs

            -- We only want to add the external ones to the ClosureEnv
            let (to_add, to_drop) = partition (isExternalName.fst) names_and_refs

            -- Immediately release any HValueRefs we're not going to add
            freeHValueRefs interp (map snd to_drop)
            -- Wrap finalizers on the ones we want to keep
            new_binds <- makeForeignNamedHValueRefs interp to_add

            let ce2 = ClosureEnv -> [(Name, ForeignHValue)] -> ClosureEnv
    extendClosureEnv (LinkerEnv -> ClosureEnv
    closure_env LinkerEnv
    le2) [(Name, ForeignHValue)]
    new_binds
            return $! pls1 { linker_env = le2 { closure_env = ce2 } }

    -- Link a bunch of BCOs and return references to their values
    linkSomeBCOs :: Interp
                 -> PkgsLoaded
                 -> LinkerEnv
                 -> [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 :: Interp
    -> PkgsLoaded
    -> LinkerEnv
    -> [CompiledByteCode]
    -> IO [(Name, HValueRef)]
    linkSomeBCOs Interp
    interp PkgsLoaded
    pkgs_loaded LinkerEnv
    le [CompiledByteCode]
    mods = (CompiledByteCode
     -> ([[UnlinkedBCO]] -> IO [(Name, HValueRef)])
     -> [[UnlinkedBCO]]
     -> IO [(Name, HValueRef)])
    -> ([[UnlinkedBCO]] -> IO [(Name, HValueRef)])
    -> [CompiledByteCode]
    -> [[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
    -> ([[UnlinkedBCO]] -> IO [(Name, HValueRef)])
    -> [[UnlinkedBCO]]
    -> IO [(Name, HValueRef)]
    forall {t}.
    CompiledByteCode -> ([[UnlinkedBCO]] -> t) -> [[UnlinkedBCO]] -> t
    fun [[UnlinkedBCO]] -> IO [(Name, HValueRef)]
    do_link [CompiledByteCode]
    mods []
     where
      fun :: CompiledByteCode -> ([[UnlinkedBCO]] -> t) -> [[UnlinkedBCO]] -> t
    fun CompiledByteCode{[UnlinkedBCO]
    [FFIInfo]
    Maybe ModBreaks
    AddrEnv
    ItblEnv
    bc_breaks :: CompiledByteCode -> Maybe ModBreaks
    bc_strs :: CompiledByteCode -> AddrEnv
    bc_ffis :: CompiledByteCode -> [FFIInfo]
    bc_itbls :: CompiledByteCode -> ItblEnv
    bc_bcos :: CompiledByteCode -> [UnlinkedBCO]
    bc_bcos :: [UnlinkedBCO]
    bc_itbls :: ItblEnv
    bc_ffis :: [FFIInfo]
    bc_strs :: AddrEnv
    bc_breaks :: Maybe ModBreaks
    ..} [[UnlinkedBCO]] -> t
    inner [[UnlinkedBCO]]
    accum = [[UnlinkedBCO]] -> t
    inner ([UnlinkedBCO]
    bc_bcos [UnlinkedBCO] -> [[UnlinkedBCO]] -> [[UnlinkedBCO]]
    forall a. a -> [a] -> [a]
    : [[UnlinkedBCO]]
    accum)

      do_link :: [[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 [[UnlinkedBCO]]
    mods = do
        let flat :: [UnlinkedBCO]
    flat = [ UnlinkedBCO
    bco | [UnlinkedBCO]
    bcos <- [[UnlinkedBCO]]
    mods, UnlinkedBCO
    bco <- [UnlinkedBCO]
    bcos ]
            names :: [Name]
    names = (UnlinkedBCO -> Name) -> [UnlinkedBCO] -> [Name]
    forall a b. (a -> b) -> [a] -> [b]
    map UnlinkedBCO -> Name
    unlinkedBCOName [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..])
        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
    -> PkgsLoaded
    -> LinkerEnv
    -> NameEnv Int
    -> UnlinkedBCO
    -> IO ResolvedBCO
    linkBCO Interp
    interp PkgsLoaded
    pkgs_loaded LinkerEnv
    le NameEnv Int
    bco_ix UnlinkedBCO
    bco | UnlinkedBCO
    bco <- [UnlinkedBCO]
    flat ]
        hvrefs <- createBCOs interp resolved
        return (zip names 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

            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
                     pls1 <- Interp -> [Linkable] -> LoaderState -> IO LoaderState
    unload_wkr Interp
    interp [Linkable]
    linkables LoaderState
    pls
                     return (pls1, pls1)

            let logger = HscEnv -> Logger
    hsc_logger HscEnv
    hsc_env
            debugTraceMsg logger 3 $
              text "unload: retaining objs" <+> ppr (moduleEnvElts $ objs_loaded new_pls)
            debugTraceMsg logger 3 $
              text "unload: retaining bcos" <+> ppr (moduleEnvElts $ bcos_loaded new_pls)
            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)]
    PkgsLoaded
    LinkableSet
    LinkerEnv
    linker_env :: LoaderState -> LinkerEnv
    pkgs_loaded :: LoaderState -> PkgsLoaded
    bcos_loaded :: LoaderState -> LinkableSet
    objs_loaded :: LoaderState -> LinkableSet
    temp_sos :: LoaderState -> [(String, String)]
    linker_env :: LinkerEnv
    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 -> Bool
          keep_name :: Name -> Bool
    keep_name Name
    n = Name -> Bool
    isExternalName Name
    n Bool -> Bool -> Bool
    &&
                        HasDebugCallStack => Name -> Module
    Name -> Module
    nameModule Name
    n Module -> LinkableSet -> Bool
    forall a. Module -> ModuleEnv a -> Bool
    `elemModuleEnv` LinkableSet
    remaining_bcos_loaded

          !new_pls :: LoaderState
    new_pls = LoaderState
    pls { linker_env = filterLinkerEnv keep_name linker_env,
                           bcos_loaded = remaining_bcos_loaded,
                           objs_loaded = 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
        pkgs' <- PkgsLoaded -> [UnitId] -> IO PkgsLoaded
    link (LoaderState -> PkgsLoaded
    pkgs_loaded LoaderState
    pls) [UnitId]
    new_pks
        return $! pls { pkgs_loaded = 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 (HasDebugCallStack => 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
                 ; pkgs' <- PkgsLoaded -> [UnitId] -> IO PkgsLoaded
    link PkgsLoaded
    pkgs [UnitId]
    deps
                    -- Now link the package itself
                 ; (hs_cls, extra_cls, loaded_dlls) <- loadPackage interp hsc_env pkg_cfg
                 ; let 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)
                                                       ]
                 ; return (addToUDFM pkgs' new_pkg (LoadedPkgInfo new_pkg hs_cls extra_cls loaded_dlls 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], [RemotePtr LoadedDLL])
    loadPackage :: Interp
    -> HscEnv
    -> UnitInfo
    -> IO ([LibrarySpec], [LibrarySpec], [RemotePtr LoadedDLL])
    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]
            gcc_paths <- Logger -> DynFlags -> OS -> IO [String]
    getGCCPaths Logger
    logger DynFlags
    dflags (Platform -> OS
    platformOS Platform
    platform)
            dirs_env <- addEnvPaths "LIBRARY_PATH" dirs

            hs_classifieds
               <- mapM (locateLib interp hsc_env True  dirs_env gcc_paths) hs_libs'
            extra_classifieds
               <- mapM (locateLib interp hsc_env False dirs_env gcc_paths) extra_libs
            let 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_hs_dlls    = [ String
    dll | DLLPath String
    dll <- [LibrarySpec]
    hs_classifieds ]
                known_extra_dlls = [ String
    dll | DLLPath String
    dll <- [LibrarySpec]
    extra_classifieds ]
                known_dlls       = [String]
    known_hs_dlls [String] -> [String] -> [String]
    forall a. [a] -> [a] -> [a]
    ++ [String]
    known_extra_dlls
    #if defined(CAN_LOAD_DLL)
                dlls       = [ String
    dll  | DLL String
    dll        <- [LibrarySpec]
    classifieds ]
    #endif
                objs       = [ String
    obj  | Objects [String]
    objs    <- [LibrarySpec]
    classifieds
                                    , String
    obj <- [String]
    objs ]
                archs      = [ String
    arch | Archive String
    arch   <- [LibrarySpec]
    classifieds ]

            -- Add directories to library search paths
            let dll_paths  = (String -> String) -> [String] -> [String]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> String
    takeDirectory [String]
    known_dlls
                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
            all_paths_env <- addEnvPaths "LD_LIBRARY_PATH" all_paths
            pathCache <- mapM (addLibrarySearchPath interp) all_paths_env

            maybePutSDoc logger
                (text "Loading unit " <> pprUnitInfoForUser pkg <> text " ... ")

    #if defined(CAN_LOAD_DLL)
            loadFrameworks interp platform pkg
            -- See Note [Crash early load_dyn and locateLib]
            -- Crash early if can't load any of `known_dlls`
            mapM_ (load_dyn interp hsc_env True) known_extra_dlls
            loaded_dlls <- mapMaybeM (load_dyn interp hsc_env True) known_hs_dlls
            -- For remaining `dlls` crash early only when there is surely
            -- no package's DLL around ... (not is_dyn)
            mapM_ (load_dyn interp hsc_env (not is_dyn) . platformSOName platform) dlls
    #else
            let loaded_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.
            mapM_ (loadObj interp) objs
            mapM_ (loadArchive interp) archs

            maybePutStr logger "linking ... "
            ok <- resolveObjs 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.
            mapM_ (removeLibrarySearchPath interp) $ reverse pathCache

            if succeeded ok
               then do
                 maybePutStrLn logger "done."
                 return (hs_classifieds, extra_classifieds, loaded_dlls)
               else let errmsg = String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "unable to load unit `"
                                 SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <> UnitInfo -> SDoc
    pprUnitInfoForUser UnitInfo
    pkg SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <> String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    "'"
                     in throwGhcExceptionIO (InstallationError (showSDoc dflags 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 (Maybe (RemotePtr LoadedDLL))
    load_dyn :: Interp
    -> HscEnv -> Bool -> String -> IO (Maybe (RemotePtr LoadedDLL))
    load_dyn Interp
    interp HscEnv
    hsc_env Bool
    crash_early String
    dll = do
      r <- Interp -> String -> IO (Either String (RemotePtr LoadedDLL))
    loadDLL Interp
    interp String
    dll
      case r of
        Right RemotePtr LoadedDLL
    loaded_dll -> Maybe (RemotePtr LoadedDLL) -> IO (Maybe (RemotePtr LoadedDLL))
    forall a. a -> IO a
    forall (f :: * -> *) a. Applicative f => a -> f a
    pure (RemotePtr LoadedDLL -> Maybe (RemotePtr LoadedDLL)
    forall a. a -> Maybe a
    Just RemotePtr LoadedDLL
    loaded_dll)
        Left String
    err ->
          if Bool
    crash_early
            then String -> IO (Maybe (RemotePtr LoadedDLL))
    forall a. String -> IO a
    cmdLineErrorIO String
    err
            else do
              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 -> Maybe DiagnosticCode -> MessageClass
    mkMCDiagnostic DiagOpts
    diag_opts (WarningFlag -> DiagnosticReason
    WarningWithFlag WarningFlag
    Opt_WarnMissedExtraSharedLib) Maybe DiagnosticCode
    forall a. Maybe a
    Nothing)
                      SrcSpan
    noSrcSpan (SDoc -> IO ()) -> SDoc -> IO ()
    forall a b. (a -> b) -> a -> b
    $ PprStyle -> SDoc -> SDoc
    withPprStyle PprStyle
    defaultUserStyle (String -> SDoc
    forall {doc}. (IsDoc doc, IsLine doc) => String -> doc
    note String
    err)
              Maybe (RemotePtr LoadedDLL) -> IO (Maybe (RemotePtr LoadedDLL))
    forall a. a -> IO a
    forall (f :: * -> *) a. Applicative f => a -> f a
    pure Maybe (RemotePtr LoadedDLL)
    forall a. Maybe a
    Nothing
      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 -> doc
    note String
    err = [doc] -> doc
    forall doc. IsDoc doc => [doc] -> doc
    vcat ([doc] -> doc) -> [doc] -> doc
    forall a b. (a -> b) -> a -> b
    $ (String -> doc) -> [String] -> [doc]
    forall a b. (a -> b) -> [a] -> [b]
    map String -> doc
    forall doc. IsLine doc => String -> doc
    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  r <- Interp -> [String] -> String -> IO (Maybe String)
    loadFramework Interp
    interp [String]
    fw_dirs String
    fw
                      case 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
    lib0
      | 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

         -- Emulate ld's behavior of treating $LIB in `-l:$LIB` as a literal file
         -- name
         (String
    lib, Bool
    verbatim) = case String
    lib0 of
           Char
    ':' : String
    rest -> (String
    rest, Bool
    True)
           String
    other      -> (String
    other, Bool
    False)

         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
           | Bool
    verbatim = [String
    lib]
           | Bool
    otherwise = [ 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
           | Bool
    verbatim = [String
    lib]
           | Bool
    otherwise = [ 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
           | Bool
    verbatim Bool -> Bool -> Bool
    && (String -> Bool) -> [String] -> Bool
    forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
    any (String -> String -> Bool
    `isExtensionOf` String
    lib) [String
    ".so", String
    ".dylib", String
    ".dll"]
           = String
    lib

           | Arch
    ArchX86_64 <- Arch
    arch
           , OS
    OSSolaris2 <- OS
    os
           = String
    "64" String -> String -> String
    </> String
    so_name

           | Bool
    otherwise
            = 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 -> Maybe DiagnosticCode -> MessageClass
    mkMCDiagnostic DiagOpts
    diag_opts DiagnosticReason
    WarningWithoutFlag Maybe DiagnosticCode
    forall a. Maybe a
    Nothing
              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
    forall doc. IsLine doc => String -> doc
    text String
    "Interpreter failed to load profiled static library" SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <+> String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    lib SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <> Char -> SDoc
    forall doc. IsLine doc => Char -> doc
    char Char
    '.' SDoc -> SDoc -> SDoc
    forall doc. IsDoc doc => doc -> doc -> doc
    $$
                  String -> SDoc
    forall doc. IsLine doc => String -> doc
    text String
    " \tTrying dynamic library instead. If this fails try to rebuild" SDoc -> SDoc -> SDoc
    forall doc. IsLine doc => doc -> doc -> doc
    <+>
                  String -> SDoc
    forall doc. IsLine doc => String -> doc
    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 x' <- IO (Maybe a)
    x
                           if isJust x'
                              then return x'
                              else apply 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.
       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 = case String -> [String]
    lines String
    str of
                    []  -> String
    ""
                    String
    l:[String]
    _ -> String
    l
       if (file == so)
          then return Nothing
          else do b <- doesFileExist file -- file could be a folder (see #16063)
                  return (if b then Just file else 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 gcc_dirs <- Logger -> DynFlags -> String -> IO [String]
    getGccSearchDirectory Logger
    logger DynFlags
    dflags String
    "libraries"
               sys_dirs <- getSystemDirectories
               return $ nub $ gcc_dirs ++ 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 manner 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
        cache <- IORef [(String, [String])] -> IO [(String, [String])]
    forall a. IORef a -> IO a
    readIORef IORef [(String, [String])]
    gccSearchDirCache
        case lookup key 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
            str <- Logger -> DynFlags -> [Option] -> IO String
    askLd Logger
    logger DynFlags
    dflags [String -> Option
    Option String
    "--print-search-dirs"]
            let line = (Char -> Bool) -> String -> String
    forall a. (a -> Bool) -> [a] -> [a]
    dropWhile Char -> Bool
    isSpace String
    str
                name = String
    key String -> String -> String
    forall a. [a] -> [a] -> [a]
    ++ String
    ": ="
            if null line
              then return []
              else do let val = String -> [String]
    split (String -> [String]) -> String -> [String]
    forall a b. (a -> b) -> a -> b
    $ String -> String -> String
    find String
    name String
    line
                      dirs <- filterM doesDirectoryExist val
                      modifyIORef' gccSearchDirCache ((key, dirs):)
                      return 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 case [String]
    val of
                                  [] -> []
                                  String
    x:[String]
    _ -> 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
    x 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).
           working_dir <- IO String
    getCurrentDirectory
           values <- lookupEnv name
           case 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
    forall doc. IsLine doc => String -> doc
    text String
    s)

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