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

    DLLPath String
dll_path -> do
      do maybe_errstr <- Interp -> String -> IO (Maybe String)
loadDLL Interp
interp String
dll_path
         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]
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 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 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
        Maybe String
Nothing -> LoaderState -> IO LoaderState
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return (LoaderState -> IO LoaderState) -> LoaderState -> IO LoaderState
forall a b. (a -> b) -> a -> b
$! LoaderState
pls { temp_sos = (libPath, libName) : temp_sos }
        Just String
err -> String -> String -> IO LoaderState
forall a. String -> String -> IO a
linkFail String
msg String
err
  where
    msg :: String
msg = String
"GHC.Linker.Loader.dynLoadObjs: Loading temp shared object failed"

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

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

                The byte-code linker

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


dynLinkBCOs :: 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 -> LinkerEnv -> [CompiledByteCode] -> IO [(Name, HValueRef)]
linkSomeBCOs Interp
interp 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
             -> 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 -> LinkerEnv -> [CompiledByteCode] -> IO [(Name, HValueRef)]
linkSomeBCOs Interp
interp 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 -> LinkerEnv -> NameEnv Int -> UnlinkedBCO -> IO ResolvedBCO
linkBCO Interp
interp 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) <- 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 trans_deps)) }

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


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

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

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

        -- See Note [Fork/Exec Windows]
        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_dlls = [ String
dll  | DLLPath String
dll    <- [LibrarySpec]
classifieds ]
#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_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
#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)
           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 ()
load_dyn :: Interp -> HscEnv -> Bool -> String -> IO ()
load_dyn Interp
interp HscEnv
hsc_env Bool
crash_early String
dll = do
  r <- Interp -> String -> IO (Maybe String)
loadDLL Interp
interp String
dll
  case r of
    Maybe String
Nothing  -> () -> IO ()
forall a. a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
    Just String
err ->
      if Bool
crash_early
        then String -> IO ()
forall a. String -> IO a
cmdLineErrorIO String
err
        else
          Bool -> IO () -> IO ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (WarningFlag -> DiagOpts -> Bool
diag_wopt WarningFlag
Opt_WarnMissedExtraSharedLib DiagOpts
diag_opts)
            (IO () -> IO ()) -> IO () -> IO ()
forall a b. (a -> b) -> a -> b
$ Logger -> MessageClass -> SrcSpan -> SDoc -> IO ()
logMsg Logger
logger
                (DiagOpts
-> DiagnosticReason -> 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)
  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")