content: {-# LANGUAGE CPP, BangPatterns, MagicHash, NondecreasingIndentation, OverloadedStrings #-}
  
  -------------------------------------------------------------------------------
  --
  -- | Main API for compiling plain Haskell source code.
  --
  -- This module implements compilation of a Haskell source. It is
  -- /not/ concerned with preprocessing of source files; this is handled
  -- in "DriverPipeline".
  --
  -- There are various entry points depending on what mode we're in:
  -- "batch" mode (@--make@), "one-shot" mode (@-c@, @-S@ etc.), and
  -- "interactive" mode (GHCi). There are also entry points for
  -- individual passes: parsing, typechecking/renaming, desugaring, and
  -- simplification.
  --
  -- All the functions here take an 'HscEnv' as a parameter, but none of
  -- them return a new one: 'HscEnv' is treated as an immutable value
  -- from here on in (although it has mutable components, for the
  -- caches).
  --
  -- Warning messages are dealt with consistently throughout this API:
  -- during compilation warnings are collected, and before any function
  -- in @HscMain@ returns, the warnings are either printed, or turned
  -- into a real compialtion error if the @-Werror@ flag is enabled.
  --
  -- (c) The GRASP/AQUA Project, Glasgow University, 1993-2000
  --
  -------------------------------------------------------------------------------
  
  module Eta.Main.HscMain
      (
      -- * Making an HscEnv
        newHscEnv
  
      -- * Compiling complete source files
      , Messager, batchMsg
      , HscStatus (..)
      , hscCompileOneShot
      , hscCompileCore
  
      , genericHscCompileGetFrontendResult
  
      , genModDetails
      , hscSimpleIface
      , hscWriteIface
      , hscNormalIface
      , hscGenHardCode
      , hscInteractive
  
      -- * Running passes separately
      , hscParse
      , hscTypecheckRename
      , hscDesugar
      , makeSimpleIface
      , makeSimpleDetails
      , hscSimplify -- ToDo, shouldn't really export this
  
      -- * Support for interactive evaluation
      , hscParseIdentifier
      , hscTcRcLookupName
      , hscTcRnGetInfo
      , hscCheckSafe
      , hscGetSafe
  #ifdef ETA_REPL
      , hscIsGHCiMonad
      , hscGetModuleInterface
      , hscRnImportDecls
      , hscTcRnLookupRdrName
      , hscStmt, hscStmtWithLocation
      , hscDecls, hscDeclsWithLocation
      , hscTcExpr, hscImport, hscKcType
      , hscCompileCoreExpr
      , hscParseExpr
      , hscParsedStmt
      -- * Low-level exports for hooks
      , hscCompileCoreExpr'
  #endif
        -- We want to make sure that we export enough to be able to redefine
        -- hscFileFrontEnd in client code
      , hscParse', hscSimplify', hscDesugar', tcRnModule'
      , getHscEnv
      , hscSimpleIface', hscNormalIface'
      , oneShotMsg
      , hscFileFrontEnd, genericHscFrontend, dumpIfaceStats
      , ioMsgMaybe, showModuleIndex
      ) where
  
  #ifdef ETA_REPL
  import Eta.REPL.RemoteTypes ( ForeignHValue )
  import Eta.REPL.Linker
  import Eta.BasicTypes.Id
  import Eta.Core.CoreTidy         ( tidyExpr )
  import Eta.Types.Type             ( Type )
  import Eta.Prelude.PrelNames
  import {- Kind parts of -} Eta.Types.Type         ( Kind )
  import Eta.Core.CoreLint         ( lintInteractiveExpr )
  import Eta.BasicTypes.VarEnv           ( emptyTidyEnv )
  import Eta.Utils.Panic
  import Eta.BasicTypes.ConLike
  #endif
  
  import Eta.BasicTypes.Module
  import Eta.BasicTypes.RdrName
  import Eta.HsSyn.HsSyn
  import Eta.Core.CoreSyn
  import Eta.Utils.StringBuffer
  import Eta.Parser.Parser
  import qualified Eta.Parser.Lexer as Lexer
  import Eta.Parser.Lexer
  import Eta.BasicTypes.SrcLoc
  import Eta.TypeCheck.TcRnDriver
  import Eta.Iface.TcIface          ( typecheckIface )
  import Eta.TypeCheck.TcRnMonad
  import Eta.BasicTypes.NameCache   ( initNameCache )
  import Eta.Iface.LoadIface        ( ifaceStats, initExternalPackageState )
  import Eta.Prelude.PrelInfo
  import Eta.Iface.MkIface
  import Eta.DeSugar.DeSugar
  import Eta.SimplCore.SimplCore
  import Eta.Main.TidyPgm
  import Eta.Core.CorePrep
  import Eta.Core.CoreUtils            (exprType)
  import Eta.StgSyn.CoreToStg          ( coreToStg )
  import Eta.StgSyn.StgSyn
  import Eta.Profiling.CostCentre
  import Eta.Types.TyCon
  import Eta.BasicTypes.Name
  import Eta.SimplStg.SimplStg         ( stg2stg )
  import Eta.BasicTypes.NameEnv        ( emptyNameEnv )
  import Eta.Types.InstEnv
  import Eta.Types.FamInstEnv
  import Eta.Utils.Fingerprint         ( Fingerprint )
  import Eta.Utils.PprColor
  import Eta.Main.Hooks
  import Eta.TypeCheck.TcEnv
  import Eta.Main.DynFlags
  import Eta.Main.ErrUtils
  
  import Eta.Utils.Outputable
  import Eta.Main.HscStats             ( ppSourceStats )
  import Eta.Main.HscTypes
  import Eta.Utils.FastString
  import Eta.BasicTypes.UniqSupply
  import Eta.Utils.Bag
  import Eta.Utils.Exception
  
  import Eta.Utils.Util
  
  import Eta.CodeGen.Main
  import Eta.CodeGen.Name
  import Eta.Utils.JAR
  import Eta.Main.Packages
  import Codec.JVM
  
  import Data.List
  import Data.IORef
  import System.FilePath as FilePath
  import System.Directory
  import qualified Data.Map as M
  import qualified Data.Text as T
  import qualified Data.Set as S
  import Data.Set (Set)
  import Control.Arrow((&&&))
  import Control.Monad
  import Data.Data hiding (Fixity)
  import Control.Concurrent
  #include "HsVersions.h"
  
  {- **********************************************************************
  %*                                                                      *
                  Initialisation
  %*                                                                      *
  %********************************************************************* -}
  
  newHscEnv :: DynFlags -> IO HscEnv
  newHscEnv dflags = do
      eps_var <- newIORef initExternalPackageState
      us      <- mkSplitUniqSupply 'r'
      nc_var  <- newIORef (initNameCache us knownKeyNames)
      fc_var  <- newIORef emptyInstalledModuleEnv
      iserv_mvar <- newMVar Nothing
      mlc_var <- newIORef emptyModuleEnv
      ic      <- newInteractiveContext dflags
      idx_var <- newMVar emptyClassIndex
      return HscEnv {  hsc_dflags       = dflags,
                       hsc_targets      = [],
                       hsc_mod_graph    = emptyMG,
                       hsc_IC           = ic,
                       hsc_HPT          = emptyHomePackageTable,
                       hsc_EPS          = eps_var,
                       hsc_NC           = nc_var,
                       hsc_FC           = fc_var,
                       hsc_iserv        = iserv_mvar,
                       hsc_MLC          = mlc_var,
                       hsc_type_env_var = Nothing,
                       hsc_classIndex   = idx_var }
  
  -- -----------------------------------------------------------------------------
  
  getWarnings :: Hsc WarningMessages
  getWarnings = Hsc $ \_ w -> return (w, w)
  
  clearWarnings :: Hsc ()
  clearWarnings = Hsc $ \_ _ -> return ((), emptyBag)
  
  logWarnings :: WarningMessages -> Hsc ()
  logWarnings w = Hsc $ \_ w0 -> return ((), w0 `unionBags` w)
  
  getHscEnv :: Hsc HscEnv
  getHscEnv = Hsc $ \e w -> return (e, w)
  
  handleWarnings :: Hsc ()
  handleWarnings = do
      dflags <- getDynFlags
      w <- getWarnings
      liftIO $ printOrThrowWarnings dflags w
      clearWarnings
  
  -- | log warning in the monad, and if there are errors then
  -- throw a SourceError exception.
  logWarningsReportErrors :: Messages -> Hsc ()
  logWarningsReportErrors (warns,errs) = do
      logWarnings warns
      when (not $ isEmptyBag errs) $ throwErrors errs
  
  -- | Throw some errors.
  throwErrors :: ErrorMessages -> Hsc a
  throwErrors = liftIO . throwIO . mkSrcErr
  
  -- | Deal with errors and warnings returned by a compilation step
  --
  -- In order to reduce dependencies to other parts of the compiler, functions
  -- outside the "main" parts of GHC return warnings and errors as a parameter
  -- and signal success via by wrapping the result in a 'Maybe' type. This
  -- function logs the returned warnings and propagates errors as exceptions
  -- (of type 'SourceError').
  --
  -- This function assumes the following invariants:
  --
  --  1. If the second result indicates success (is of the form 'Just x'),
  --     there must be no error messages in the first result.
  --
  --  2. If there are no error messages, but the second result indicates failure
  --     there should be warnings in the first result. That is, if the action
  --     failed, it must have been due to the warnings (i.e., @-Werror@).
  ioMsgMaybe :: IO (Messages, Maybe a) -> Hsc a
  ioMsgMaybe ioA = do
      ((warns,errs), mb_r) <- liftIO ioA
      logWarnings warns
      case mb_r of
          Nothing -> throwErrors errs
          Just r  -> ASSERT( isEmptyBag errs ) return r
  
  -- | like ioMsgMaybe, except that we ignore error messages and return
  -- 'Nothing' instead.
  ioMsgMaybe' :: IO (Messages, Maybe a) -> Hsc (Maybe a)
  ioMsgMaybe' ioA = do
      ((warns,_errs), mb_r) <- liftIO $ ioA
      logWarnings warns
      return mb_r
  
  -- -----------------------------------------------------------------------------
  -- | Lookup things in the compiler's environment
  
  #ifdef ETA_REPL
  hscTcRnLookupRdrName :: HscEnv -> Located RdrName -> IO [Name]
  hscTcRnLookupRdrName hsc_env0 rdr_name
    = runInteractiveHsc hsc_env0 $
      do { hsc_env <- getHscEnv
         ; ioMsgMaybe $ tcRnLookupRdrName hsc_env rdr_name }
  #endif
  
  hscTcRcLookupName :: HscEnv -> Name -> IO (Maybe TyThing)
  hscTcRcLookupName hsc_env0 name = runInteractiveHsc hsc_env0 $ do
    hsc_env <- getHscEnv
    ioMsgMaybe' $ tcRnLookupName hsc_env name
        -- ignore errors: the only error we're likely to get is
        -- "name not found", and the Maybe in the return type
        -- is used to indicate that.
  
  hscTcRnGetInfo :: HscEnv -> Name -> IO (Maybe (TyThing, Fixity, [ClsInst], [FamInst], SDoc))
  hscTcRnGetInfo hsc_env0 name
    = runInteractiveHsc hsc_env0 $
      do { hsc_env <- getHscEnv
         ; ioMsgMaybe' $ tcRnGetInfo hsc_env name }
  
  #ifdef ETA_REPL
  hscIsGHCiMonad :: HscEnv -> String -> IO Name
  hscIsGHCiMonad hsc_env name
    = runHsc hsc_env $ ioMsgMaybe $ isGHCiMonad hsc_env name
  
  hscGetModuleInterface :: HscEnv -> Module -> IO ModIface
  hscGetModuleInterface hsc_env0 mod = runInteractiveHsc hsc_env0 $ do
    hsc_env <- getHscEnv
    ioMsgMaybe $ getModuleInterface hsc_env mod
  
  -- -----------------------------------------------------------------------------
  -- | Rename some import declarations
  hscRnImportDecls :: HscEnv -> [LImportDecl RdrName] -> IO GlobalRdrEnv
  hscRnImportDecls hsc_env0 import_decls = runInteractiveHsc hsc_env0 $ do
    hsc_env <- getHscEnv
    ioMsgMaybe $ tcRnImportDecls hsc_env import_decls
  #endif
  
  -- -----------------------------------------------------------------------------
  -- | parse a file, returning the abstract syntax
  
  hscParse :: HscEnv -> ModSummary -> IO HsParsedModule
  hscParse hsc_env mod_summary = runHsc hsc_env $ hscParse' mod_summary
  
  -- internal version, that doesn't fail due to -Werror
  hscParse' :: ModSummary -> Hsc HsParsedModule
  hscParse' mod_summary
   | Just r <- ms_parsed_mod mod_summary = return r
   | otherwise = do
      dflags <- getDynFlags
      let src_filename  = ms_hspp_file mod_summary
          maybe_src_buf = ms_hspp_buf  mod_summary
  
      --------------------------  Parser  ----------------
      liftIO $ showPass dflags "Parser"
      {-# SCC "Parser" #-} do
  
      -- sometimes we already have the buffer in memory, perhaps
      -- because we needed to parse the imports out of it, or get the
      -- module name.
      buf <- case maybe_src_buf of
                 Just b  -> return b
                 Nothing -> liftIO $ hGetStringBuffer src_filename
  
      let loc = mkRealSrcLoc (mkFastString src_filename) 1 1
      let parseMod | HsigFile == ms_hsc_src mod_summary
                   = parseSignature
                   | otherwise = parseModule
  
      case unP parseMod (mkPState dflags buf loc) of
          PFailed span err ->
              liftIO $ throwOneError (mkPlainErrMsg dflags span err)
  
          POk pst rdr_module -> do
              logWarningsReportErrors (getMessages pst)
              liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" $
                                     ppr rdr_module
              liftIO $ dumpIfSet_dyn dflags Opt_D_source_stats "Source Statistics" $
                                     ppSourceStats False rdr_module
  
              -- To get the list of extra source files, we take the list
              -- that the parser gave us,
              --   - eliminate files beginning with '<'.  gcc likes to use
              --     pseudo-filenames like "<built-in>" and "<command-line>"
              --   - normalise them (elimiante differences between ./f and f)
              --   - filter out the preprocessed source file
              --   - filter out anything beginning with tmpdir
              --   - remove duplicates
              --   - filter out the .hs/.lhs source filename if we have one
              --
              let n_hspp  = FilePath.normalise src_filename
                  srcs0 = nub $ filter (not . (tmpDir dflags `isPrefixOf`))
                              $ filter (not . (== n_hspp))
                              $ map FilePath.normalise
                              $ filter (not . (isPrefixOf "<"))
                              $ map unpackFS
                              $ srcfiles pst
                  srcs1 = case ml_hs_file (ms_location mod_summary) of
                            Just f  -> filter (/= FilePath.normalise f) srcs0
                            Nothing -> srcs0
  
              -- sometimes we see source files from earlier
              -- preprocessing stages that cannot be found, so just
              -- filter them out:
              srcs2 <- liftIO $ filterM doesFileExist srcs1
  
              return HsParsedModule {
                        hpm_module    = rdr_module,
                        hpm_src_files = srcs2,
                        hpm_annotations
                                = (M.fromListWith (++) $ annotations pst,
                                   M.fromList $ ((noSrcSpan,comment_q pst)
                                                   :(annotations_comments pst)))
                     }
  
  -- XXX: should this really be a Maybe X?  Check under which circumstances this
  -- can become a Nothing and decide whether this should instead throw an
  -- exception/signal an error.
  type RenamedStuff =
          (Maybe (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
                  Maybe LHsDocString))
  
  -- | Rename and typecheck a module, additionally returning the renamed syntax
  hscTypecheckRename :: HscEnv -> ModSummary -> HsParsedModule
                     -> IO (TcGblEnv, RenamedStuff)
  hscTypecheckRename hsc_env mod_summary rdr_module = runHsc hsc_env $ do
      tc_result <- tcRnModule' hsc_env mod_summary False rdr_module
  
          -- This 'do' is in the Maybe monad!
      let rn_info = do decl <- tcg_rn_decls tc_result
                       let imports = tcg_rn_imports tc_result
                           exports = tcg_rn_exports tc_result
                           doc_hdr = tcg_doc_hdr tc_result
                       return (decl,imports,exports,doc_hdr)
  
      return (tc_result, rn_info)
  
  hscTypecheck :: Bool -- ^ Keep renamed source?
               -> ModSummary -> Maybe HsParsedModule
               -> Hsc TcGblEnv
  hscTypecheck keep_rn mod_summary mb_rdr_module = do
      hsc_env <- getHscEnv
      let hsc_src = ms_hsc_src mod_summary
          dflags = hsc_dflags hsc_env
          outer_mod = ms_mod mod_summary
          inner_mod = canonicalizeHomeModule dflags (moduleName outer_mod)
          src_filename  = ms_hspp_file mod_summary
          real_loc = realSrcLocSpan $ mkRealSrcLoc (mkFastString src_filename) 1 1
      MASSERT( moduleUnitId outer_mod == thisPackage dflags )
      if hsc_src == HsigFile && not (isHoleModule inner_mod)
          then ioMsgMaybe $ tcRnInstantiateSignature hsc_env outer_mod real_loc
          else
           do hpm <- case mb_rdr_module of
                      Just hpm -> return hpm
                      Nothing -> hscParse' mod_summary
              tc_result0 <- tcRnModule' hsc_env mod_summary keep_rn hpm
              if hsc_src == HsigFile
                  then do (iface, _, _) <- liftIO $ hscSimpleIface hsc_env tc_result0 Nothing
                          ioMsgMaybe $
                              tcRnMergeSignatures hsc_env (tcg_top_loc tc_result0) iface
                  else return tc_result0
  
  
  -- wrapper around tcRnModule to handle safe haskell extras
  tcRnModule' :: HscEnv -> ModSummary -> Bool -> HsParsedModule
              -> Hsc TcGblEnv
  tcRnModule' hsc_env sum save_rn_syntax mod = do
      tcg_res <- {-# SCC "Typecheck-Rename" #-}
                 ioMsgMaybe $
                     tcRnModule hsc_env (ms_hsc_src sum) save_rn_syntax mod
  
      tcSafeOK <- liftIO $ readIORef (tcg_safeInfer tcg_res)
      dflags   <- getDynFlags
      let allSafeOK = safeInferred dflags && tcSafeOK
  
      -- end of the safe haskell line, how to respond to user?
      if not (safeHaskellOn dflags) || (safeInferOn dflags && not allSafeOK)
          -- if safe Haskell off or safe infer failed, mark unsafe
          then markUnsafeInfer tcg_res emptyBag
  
          -- module (could be) safe, throw warning if needed
          else do
              tcg_res' <- hscCheckSafeImports tcg_res
              safe <- liftIO $ readIORef (tcg_safeInfer tcg_res')
              when safe $ do
                case wopt Opt_WarnSafe dflags of
                  True -> (logWarnings $ unitBag $ mkPlainWarnMsg dflags
                         (warnSafeOnLoc dflags) $ errSafe tcg_res')
                  False | safeHaskell dflags == Sf_Trustworthy &&
                          wopt Opt_WarnTrustworthySafe dflags ->
                    (logWarnings $ unitBag $ mkPlainWarnMsg dflags
                      (trustworthyOnLoc dflags) $ errTwthySafe tcg_res')
                  False -> return ()
              return tcg_res'
    where
      pprMod t  = ppr $ moduleName $ tcg_mod t
      errSafe t = quotes (pprMod t) <+> text "has been inferred as safe!"
      errTwthySafe t = quotes (pprMod t)
        <+> text "is marked as Trustworthy but has been inferred as safe!"
  
  -- | Convert a typechecked module to Core
  hscDesugar :: HscEnv -> ModSummary -> TcGblEnv -> IO ModGuts
  hscDesugar hsc_env mod_summary tc_result =
      runHsc hsc_env $ hscDesugar' (ms_location mod_summary) tc_result
  
  hscDesugar' :: ModLocation -> TcGblEnv -> Hsc ModGuts
  hscDesugar' mod_location tc_result = do
      hsc_env <- getHscEnv
      r <- ioMsgMaybe $
        {-# SCC "deSugar" #-}
        deSugar hsc_env mod_location tc_result
  
      -- always check -Werror after desugaring, this is the last opportunity for
      -- warnings to arise before the backend.
      handleWarnings
      return r
  
  -- | Make a 'ModIface' from the results of typechecking. Used when
  -- not optimising, and the interface doesn't need to contain any
  -- unfoldings or other cross-module optimisation info.
  -- ToDo: the old interface is only needed to get the version numbers,
  -- we should use fingerprint versions instead.
  makeSimpleIface :: HscEnv -> Maybe ModIface -> TcGblEnv -> ModDetails
                  -> IO (ModIface,Bool)
  makeSimpleIface hsc_env maybe_old_iface tc_result details = runHsc hsc_env $ do
      safe_mode <- hscGetSafeMode tc_result
      ioMsgMaybe $ do
          mkIfaceTc hsc_env (fmap mi_iface_hash maybe_old_iface) safe_mode
                    details tc_result
  
  -- | Make a 'ModDetails' from the results of typechecking. Used when
  -- typechecking only, as opposed to full compilation.
  makeSimpleDetails :: HscEnv -> TcGblEnv -> IO ModDetails
  makeSimpleDetails hsc_env tc_result = mkBootModDetailsTc hsc_env tc_result
  
  
  {- **********************************************************************
  %*                                                                      *
                  The main compiler pipeline
  %*                                                                      *
  %********************************************************************* -}
  
  {-
                     --------------------------------
                          The compilation proper
                     --------------------------------
  
  It's the task of the compilation proper to compile Haskell, hs-boot and core
  files to either byte-code, hard-code (C, asm, LLVM, ect) or to nothing at all
  (the module is still parsed and type-checked. This feature is mostly used by
  IDE's and the likes). Compilation can happen in either 'one-shot', 'batch',
  'nothing', or 'interactive' mode. 'One-shot' mode targets hard-code, 'batch'
  mode targets hard-code, 'nothing' mode targets nothing and 'interactive' mode
  targets byte-code.
  
  The modes are kept separate because of their different types and meanings:
  
   * In 'one-shot' mode, we're only compiling a single file and can therefore
   discard the new ModIface and ModDetails. This is also the reason it only
   targets hard-code; compiling to byte-code or nothing doesn't make sense when
   we discard the result.
  
   * 'Batch' mode is like 'one-shot' except that we keep the resulting ModIface
   and ModDetails. 'Batch' mode doesn't target byte-code since that require us to
   return the newly compiled byte-code.
  
   * 'Nothing' mode has exactly the same type as 'batch' mode but they're still
   kept separate. This is because compiling to nothing is fairly special: We
   don't output any interface files, we don't run the simplifier and we don't
   generate any code.
  
   * 'Interactive' mode is similar to 'batch' mode except that we return the
   compiled byte-code together with the ModIface and ModDetails.
  
  Trying to compile a hs-boot file to byte-code will result in a run-time error.
  This is the only thing that isn't caught by the type-system.
  -}
  
  
  type Messager = HscEnv -> (Int,Int) -> RecompileRequired -> ModSummary -> IO ()
  
  genericHscCompileGetFrontendResult ::
                       Bool -- always do basic recompilation check?
                    -> Maybe TcGblEnv
                    -> Maybe Messager
                    -> HscEnv
                    -> ModSummary
                    -> SourceModified
                    -> Maybe ModIface  -- Old interface, if available
                    -> (Int,Int)       -- (i,n) = module i of n (for msgs)
                    -> IO (Either ModIface (TcGblEnv, Maybe Fingerprint))
  
  genericHscCompileGetFrontendResult
    always_do_basic_recompilation_check m_tc_result
    mHscMessage hsc_env mod_summary source_modified mb_old_iface mod_index
      = do
  
      let msg what = case mHscMessage of
                     Just hscMessage -> hscMessage hsc_env mod_index what mod_summary
                     Nothing -> return ()
  
          skip iface = do
              msg UpToDate
              return $ Left iface
  
          compile mb_old_hash reason = do
              msg reason
              tc_result <- runHsc hsc_env $ genericHscFrontend mod_summary
              return $ Right (tc_result, mb_old_hash)
  
          stable = case source_modified of
                       SourceUnmodifiedAndStable -> True
                       _                         -> False
  
      case m_tc_result of
           Just tc_result
            | not always_do_basic_recompilation_check ->
               return $ Right (tc_result, Nothing)
           _ -> do
              (recomp_reqd, mb_checked_iface)
                  <- {-# SCC "checkOldIface" #-}
                     checkOldIface hsc_env mod_summary
                                  source_modified mb_old_iface
              -- save the interface that comes back from checkOldIface.
              -- In one-shot mode we don't have the old iface until this
              -- point, when checkOldIface reads it from the disk.
              let mb_old_hash = fmap mi_iface_hash mb_checked_iface
  
              case mb_checked_iface of
                  Just iface | not (recompileRequired recomp_reqd) ->
                      -- If the module used TH splices when it was last
                      -- compiled, then the recompilation check is not
                      -- accurate enough (#481) and we must ignore
                      -- it.  However, if the module is stable (none of
                      -- the modules it depends on, directly or
                      -- indirectly, changed), then we *can* skip
                      -- recompilation. This is why the SourceModified
                      -- type contains SourceUnmodifiedAndStable, and
                      -- it's pretty important: otherwise ghc --make
                      -- would always recompile TH modules, even if
                      -- nothing at all has changed. Stability is just
                      -- the same check that make is doing for us in
                      -- one-shot mode.
                      case m_tc_result of
                      Nothing
                       | mi_used_th iface && not stable ->
                          compile mb_old_hash (RecompBecause "TH")
                      _ ->
                          skip iface
                  _ ->
                      case m_tc_result of
                      Nothing -> compile mb_old_hash recomp_reqd
                      Just tc_result ->
                          return $ Right (tc_result, mb_old_hash)
  
  genericHscFrontend :: ModSummary -> Hsc TcGblEnv
  genericHscFrontend mod_summary =
    getHooked hscFrontendHook genericHscFrontend' >>= ($ mod_summary)
  
  genericHscFrontend' :: ModSummary -> Hsc TcGblEnv
  genericHscFrontend' mod_summary = hscFileFrontEnd mod_summary
  
  --------------------------------------------------------------
  -- Compilers
  --------------------------------------------------------------
  
  hscCompileOneShot :: HscEnv
                    -> ModSummary
                    -> SourceModified
                    -> IO HscStatus
  hscCompileOneShot env =
    lookupHook hscCompileOneShotHook hscCompileOneShot' (hsc_dflags env) env
  
  -- Compile Haskell/boot in OneShot mode.
  hscCompileOneShot' :: HscEnv
                     -> ModSummary
                     -> SourceModified
                     -> IO HscStatus
  hscCompileOneShot' hsc_env mod_summary src_changed
    = do
      -- One-shot mode needs a knot-tying mutable variable for interface
      -- files. See TcRnTypes.TcGblEnv.tcg_type_env_var.
      -- See also Note [hsc_type_env_var hack]
      type_env_var <- newIORef emptyNameEnv
      let mod = ms_mod mod_summary
          hsc_env' = hsc_env{ hsc_type_env_var = Just (mod, type_env_var) }
  
          msg what = oneShotMsg hsc_env' what
  
          skip = do msg UpToDate
                    dumpIfaceStats hsc_env'
                    return HscUpToDate
  
          compile mb_old_hash reason = runHsc hsc_env' $ do
              liftIO $ msg reason
              tc_result <- genericHscFrontend mod_summary
              guts0 <- hscDesugar' (ms_location mod_summary) tc_result
              dflags <- getDynFlags
              case hscTarget dflags of
                  HscNothing -> do
                      when (gopt Opt_WriteInterface dflags) $ liftIO $ do
                          (iface, changed, _details) <- hscSimpleIface hsc_env tc_result mb_old_hash
                          hscWriteIface dflags iface changed mod_summary
                      return HscNotGeneratingCode
                  _ ->
                      case ms_hsc_src mod_summary of
                      t | isHsBootOrSig t ->
                          do (iface, changed, _) <- hscSimpleIface' tc_result mb_old_hash
                             liftIO $ hscWriteIface dflags iface changed mod_summary
                             return (case t of
                                      HsBootFile -> HscUpdateBoot
                                      HsigFile -> HscUpdateSig
                                      HsSrcFile -> panic "hscCompileOneShot Src")
                      _ ->
                          do guts <- hscSimplify' guts0
                             (iface, changed, _details, cgguts) <- hscNormalIface' guts mb_old_hash
                             liftIO $ hscWriteIface dflags iface changed mod_summary
                             return $ HscRecomp cgguts mod_summary
  
          -- XXX This is always False, because in one-shot mode the
          -- concept of stability does not exist.  The driver never
          -- passes SourceUnmodifiedAndStable in here.
          stable = case src_changed of
                       SourceUnmodifiedAndStable -> True
                       _                         -> False
  
      (recomp_reqd, mb_checked_iface)
          <- {-# SCC "checkOldIface" #-}
             checkOldIface hsc_env' mod_summary src_changed Nothing
      -- save the interface that comes back from checkOldIface.
      -- In one-shot mode we don't have the old iface until this
      -- point, when checkOldIface reads it from the disk.
      let mb_old_hash = fmap mi_iface_hash mb_checked_iface
  
      case mb_checked_iface of
          Just iface | not (recompileRequired recomp_reqd) ->
              -- If the module used TH splices when it was last compiled,
              -- then the recompilation check is not accurate enough (#481)
              -- and we must ignore it. However, if the module is stable
              -- (none of the modules it depends on, directly or indirectly,
              -- changed), then we *can* skip recompilation. This is why
              -- the SourceModified type contains SourceUnmodifiedAndStable,
              -- and it's pretty important: otherwise ghc --make would
              -- always recompile TH modules, even if nothing at all has
              -- changed. Stability is just the same check that make is
              -- doing for us in one-shot mode.
              if mi_used_th iface && not stable
              then compile mb_old_hash (RecompBecause "TH")
              else skip
          _ ->
              compile mb_old_hash recomp_reqd
  
  --------------------------------------------------------------
  -- NoRecomp handlers
  --------------------------------------------------------------
  -- NB: this must be knot-tied appropriately, see hscIncrementalCompile
  genModDetails :: HscEnv -> ModIface -> IO ModDetails
  genModDetails hsc_env old_iface
    = do
      new_details <- {-# SCC "tcRnIface" #-}
                     initIfaceLoad hsc_env (typecheckIface old_iface)
      dumpIfaceStats hsc_env
      return new_details
  
  --------------------------------------------------------------
  -- Progress displayers.
  --------------------------------------------------------------
  
  oneShotMsg :: HscEnv -> RecompileRequired -> IO ()
  oneShotMsg hsc_env recomp =
      case recomp of
          UpToDate ->
              compilationProgressMsg (hsc_dflags hsc_env) $
                     "compilation IS NOT required"
          _ ->
              return ()
  
  batchMsg :: Messager
  batchMsg hsc_env mod_index recomp mod_summary =
      case recomp of
          MustCompile -> showMsg "Compiling " ""
          UpToDate
              | verbosity (hsc_dflags hsc_env) >= 2 -> showMsg "Skipping  " ""
              | otherwise -> return ()
          RecompBecause reason -> showMsg "Compiling " (" [" ++ reason ++ "]")
      where
          dflags = hsc_dflags hsc_env
          showMsg msg reason =
              compilationProgressMsg dflags $
                showSDocWithColor dflags $
                  colored colYellowFg (text $
                    showModuleIndex mod_index ++ msg ++
                    showModMsg dflags (hscTarget dflags) (recompileRequired recomp) mod_summary ++
                    reason)
  
  --------------------------------------------------------------
  -- FrontEnds
  --------------------------------------------------------------
  
  hscFileFrontEnd :: ModSummary -> Hsc TcGblEnv
  hscFileFrontEnd mod_summary = hscTypecheck False mod_summary Nothing
  -- hscFileFrontEnd mod_summary = do
  --     hpm <- hscParse' mod_summary
  --     hsc_env <- getHscEnv
  --     tcg_env <- tcRnModule' hsc_env mod_summary False hpm
  --     return tcg_env
  
  --------------------------------------------------------------
  -- Safe Haskell
  --------------------------------------------------------------
  
  -- Note [Safe Haskell Trust Check]
  -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  -- Safe Haskell checks that an import is trusted according to the following
  -- rules for an import of module M that resides in Package P:
  --
  --   * If M is recorded as Safe and all its trust dependencies are OK
  --     then M is considered safe.
  --   * If M is recorded as Trustworthy and P is considered trusted and
  --     all M's trust dependencies are OK then M is considered safe.
  --
  -- By trust dependencies we mean that the check is transitive. So if
  -- a module M that is Safe relies on a module N that is trustworthy,
  -- importing module M will first check (according to the second case)
  -- that N is trusted before checking M is trusted.
  --
  -- This is a minimal description, so please refer to the user guide
  -- for more details. The user guide is also considered the authoritative
  -- source in this matter, not the comments or code.
  
  
  -- Note [Safe Haskell Inference]
  -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  -- Safe Haskell does Safe inference on modules that don't have any specific
  -- safe haskell mode flag. The basic aproach to this is:
  --   * When deciding if we need to do a Safe language check, treat
  --     an unmarked module as having -XSafe mode specified.
  --   * For checks, don't throw errors but return them to the caller.
  --   * Caller checks if there are errors:
  --     * For modules explicitly marked -XSafe, we throw the errors.
  --     * For unmarked modules (inference mode), we drop the errors
  --       and mark the module as being Unsafe.
  --
  -- It used to be that we only did safe inference on modules that had no Safe
  -- Haskell flags, but now we perform safe inference on all modules as we want
  -- to allow users to set the `--fwarn-safe`, `--fwarn-unsafe` and
  -- `--fwarn-trustworthy-safe` flags on Trustworthy and Unsafe modules so that a
  -- user can ensure their assumptions are correct and see reasons for why a
  -- module is safe or unsafe.
  --
  -- This is tricky as we must be careful when we should throw an error compared
  -- to just warnings. For checking safe imports we manage it as two steps. First
  -- we check any imports that are required to be safe, then we check all other
  -- imports to see if we can infer them to be safe.
  
  
  -- | Check that the safe imports of the module being compiled are valid.
  -- If not we either issue a compilation error if the module is explicitly
  -- using Safe Haskell, or mark the module as unsafe if we're in safe
  -- inference mode.
  hscCheckSafeImports :: TcGblEnv -> Hsc TcGblEnv
  hscCheckSafeImports tcg_env = do
      dflags   <- getDynFlags
      tcg_env' <- checkSafeImports dflags tcg_env
      checkRULES dflags tcg_env'
  
    where
      checkRULES dflags tcg_env' = do
        case safeLanguageOn dflags of
            True -> do
                -- XSafe: we nuke user written RULES
                logWarnings $ warns dflags (tcg_rules tcg_env')
                return tcg_env' { tcg_rules = [] }
            False
                  -- SafeInferred: user defined RULES, so not safe
                | safeInferOn dflags && not (null $ tcg_rules tcg_env')
                -> markUnsafeInfer tcg_env' $ warns dflags (tcg_rules tcg_env')
  
                  -- Trustworthy OR SafeInferred: with no RULES
                | otherwise
                -> return tcg_env'
  
      warns dflags rules = listToBag $ map (warnRules dflags) rules
      warnRules dflags (L loc (HsRule n _ _ _ _ _ _)) =
          mkPlainWarnMsg dflags loc $
              text "Rule \"" <> ftext (unLoc n) <> text "\" ignored" $+$
              text "User defined rules are disabled under Safe Haskell"
  
  -- | Validate that safe imported modules are actually safe.  For modules in the
  -- HomePackage (the package the module we are compiling in resides) this just
  -- involves checking its trust type is 'Safe' or 'Trustworthy'. For modules
  -- that reside in another package we also must check that the external pacakge
  -- is trusted. See the Note [Safe Haskell Trust Check] above for more
  -- information.
  --
  -- The code for this is quite tricky as the whole algorithm is done in a few
  -- distinct phases in different parts of the code base. See
  -- RnNames.rnImportDecl for where package trust dependencies for a module are
  -- collected and unioned.  Specifically see the Note [RnNames . Tracking Trust
  -- Transitively] and the Note [RnNames . Trust Own Package].
  checkSafeImports :: DynFlags -> TcGblEnv -> Hsc TcGblEnv
  checkSafeImports dflags tcg_env
      = do
          imps <- mapM condense imports'
          let (safeImps, regImps) = partition (\(_,_,s) -> s) imps
  
          -- We want to use the warning state specifically for detecting if safe
          -- inference has failed, so store and clear any existing warnings.
          oldErrs <- getWarnings
          clearWarnings
  
          -- Check safe imports are correct
          safePkgs <- S.fromList <$> mapMaybeM checkSafe safeImps
          safeErrs <- getWarnings
          clearWarnings
  
          -- Check non-safe imports are correct if inferring safety
          -- See the Note [Safe Haskell Inference]
          (infErrs, infPkgs) <- case (safeInferOn dflags) of
            False -> return (emptyBag, S.empty)
            True -> do infPkgs <- S.fromList <$> mapMaybeM checkSafe regImps
                       infErrs <- getWarnings
                       clearWarnings
                       return (infErrs, infPkgs)
  
          -- restore old errors
          logWarnings oldErrs
  
          case (isEmptyBag safeErrs) of
            -- Failed safe check
            False -> liftIO . throwIO . mkSrcErr $ safeErrs
  
            -- Passed safe check
            True -> do
              let infPassed = isEmptyBag infErrs
              tcg_env' <- case (not infPassed) of
                True  -> markUnsafeInfer tcg_env infErrs
                False -> return tcg_env
              when (packageTrustOn dflags) $ checkPkgTrust dflags pkgReqs
              let newTrust = pkgTrustReqs safePkgs infPkgs infPassed
              return tcg_env' { tcg_imports = impInfo `plusImportAvails` newTrust }
  
    where
      impInfo  = tcg_imports tcg_env     -- ImportAvails
      imports  = imp_mods impInfo        -- ImportedMods
      imports1 = moduleEnvToList imports -- (Module, [ImportedBy])
      imports' = map (fmap importedByUser) imports1 -- (Module, [ImportedModsVal])
      pkgReqs  = imp_trust_pkgs impInfo  -- [InstalledUnitId]
  
      condense :: (Module, [ImportedModsVal]) -> Hsc (Module, SrcSpan, IsSafeImport)
      condense (_, [])   = panic "HscMain.condense: Pattern match failure!"
      condense (m, x:xs) = do imv <- foldlM cond' x xs
                              return (m, imv_span imv, imv_is_safe imv)
  
      -- ImportedModsVal = (ModuleName, Bool, SrcSpan, IsSafeImport)
      cond' :: ImportedModsVal -> ImportedModsVal -> Hsc ImportedModsVal
      cond' v1 v2
          | imv_is_safe v1 /= imv_is_safe v2
          = do
              dflags <- getDynFlags
              throwErrors $ unitBag $ mkPlainErrMsg dflags (imv_span v1)
                (text "Module" <+> ppr (imv_name v1) <+>
                (text $ "is imported both as a safe and unsafe import!"))
          | otherwise
          = return v1
  
      -- easier interface to work with
      checkSafe :: (Module, SrcSpan, a) -> Hsc (Maybe InstalledUnitId)
      checkSafe (m, l, _) = fst `fmap` hscCheckSafe' dflags m l
  
      -- what pkg's to add to our trust requirements
      pkgTrustReqs req inf infPassed | safeInferOn dflags
                                    && safeHaskell dflags == Sf_None && infPassed
                                     = emptyImportAvails {
                                         imp_trust_pkgs = req `S.union` inf
                                     }
      pkgTrustReqs _   _ _ | safeHaskell dflags == Sf_Unsafe
                           = emptyImportAvails
      pkgTrustReqs req _ _ = emptyImportAvails { imp_trust_pkgs = req }
  
  -- | Check that a module is safe to import.
  --
  -- We return True to indicate the import is safe and False otherwise
  -- although in the False case an exception may be thrown first.
  hscCheckSafe :: HscEnv -> Module -> SrcSpan -> IO Bool
  hscCheckSafe hsc_env m l = runHsc hsc_env $ do
      dflags <- getDynFlags
      pkgs <- snd `fmap` hscCheckSafe' dflags m l
      when (packageTrustOn dflags) $ checkPkgTrust dflags pkgs
      errs <- getWarnings
      return $ isEmptyBag errs
  
  -- | Return if a module is trusted and the pkgs it depends on to be trusted.
  hscGetSafe :: HscEnv -> Module -> SrcSpan -> IO (Bool, Set InstalledUnitId)
  hscGetSafe hsc_env m l = runHsc hsc_env $ do
      dflags       <- getDynFlags
      (self, pkgs) <- hscCheckSafe' dflags m l
      good         <- isEmptyBag `fmap` getWarnings
      clearWarnings -- don't want them printed...
      let pkgs' | Just p <- self = S.insert p pkgs
                | otherwise      = pkgs
      return (good, pkgs')
  
  -- | Is a module trusted? If not, throw or log errors depending on the type.
  -- Return (regardless of trusted or not) if the trust type requires the modules
  -- own package be trusted and a list of other packages required to be trusted
  -- (these later ones haven't been checked) but the own package trust has been.
  hscCheckSafe' :: DynFlags -> Module -> SrcSpan -> Hsc (Maybe InstalledUnitId, Set InstalledUnitId)
  hscCheckSafe' dflags m l = do
      (tw, pkgs) <- isModSafe m l
      case tw of
          False              -> return (Nothing, pkgs)
          True | isHomePkg m -> return (Nothing, pkgs)
               | otherwise   -> return (Just $ toInstalledUnitId (moduleUnitId m), pkgs)
    where
      isModSafe :: Module -> SrcSpan -> Hsc (Bool, Set InstalledUnitId)
      isModSafe m l = do
          iface <- lookup' m
          case iface of
              -- can't load iface to check trust!
              Nothing -> throwErrors $ unitBag $ mkPlainErrMsg dflags l
                           $ text "Can't load the interface file for" <+> ppr m
                             <> text ", to check that it can be safely imported"
  
              -- got iface, check trust
              Just iface' ->
                  let trust = getSafeMode $ mi_trust iface'
                      trust_own_pkg = mi_trust_pkg iface'
                      -- check module is trusted
                      safeM = trust `elem` [Sf_Safe, Sf_Trustworthy]
                      -- check package is trusted
                      safeP = packageTrusted trust trust_own_pkg m
                      -- pkg trust reqs
                      pkgRs = S.fromList . map fst $ filter snd $ dep_pkgs $ mi_deps iface'
                      -- General errors we throw but Safe errors we log
                      errs = case (safeM, safeP) of
                          (True, True ) -> emptyBag
                          (True, False) -> pkgTrustErr
                          (False, _   ) -> modTrustErr
                  in do
                      logWarnings errs
                      return (trust == Sf_Trustworthy, pkgRs)
  
                  where
                      pkgTrustErr = unitBag $ mkErrMsg dflags l (pkgQual dflags) $
                          sep [ ppr (moduleName m)
                                  <> text ": Can't be safely imported!"
                              , text "The package (" <> ppr (moduleUnitId m)
                                  <> text ") the module resides in isn't trusted."
                              ]
                      modTrustErr = unitBag $ mkErrMsg dflags l (pkgQual dflags) $
                          sep [ ppr (moduleName m)
                                  <> text ": Can't be safely imported!"
                              , text "The module itself isn't safe." ]
  
      -- | Check the package a module resides in is trusted. Safe compiled
      -- modules are trusted without requiring that their package is trusted. For
      -- trustworthy modules, modules in the home package are trusted but
      -- otherwise we check the package trust flag.
      packageTrusted :: SafeHaskellMode -> Bool -> Module -> Bool
      packageTrusted Sf_None             _ _ = False -- shouldn't hit these cases
      packageTrusted Sf_Unsafe           _ _ = False -- prefer for completeness.
      packageTrusted _ _ _
          | not (packageTrustOn dflags)      = True
      packageTrusted Sf_Safe         False _ = True
      packageTrusted _ _ m
          | isHomePkg m = True
          | otherwise   = trusted $ getPackageDetails dflags (moduleUnitId m)
  
      lookup' :: Module -> Hsc (Maybe ModIface)
      lookup' m = do
          hsc_env <- getHscEnv
          hsc_eps <- liftIO $ hscEPS hsc_env
          let pkgIfaceT = eps_PIT hsc_eps
              homePkgT  = hsc_HPT hsc_env
              iface     = lookupIfaceByModule dflags homePkgT pkgIfaceT m
  #ifdef ETA_REPL
          -- the 'lookupIfaceByModule' method will always fail when calling from GHCi
          -- as the compiler hasn't filled in the various module tables
          -- so we need to call 'getModuleInterface' to load from disk
          iface' <- case iface of
              Just _  -> return iface
              Nothing -> snd `fmap` (liftIO $ getModuleInterface hsc_env m)
          return iface'
  #else
          return iface
  #endif
  
  
      isHomePkg :: Module -> Bool
      isHomePkg m
          | thisPackage dflags == moduleUnitId m = True
          | otherwise                               = False
  
  -- | Check the list of packages are trusted.
  checkPkgTrust :: DynFlags -> Set InstalledUnitId -> Hsc ()
  checkPkgTrust dflags pkgs =
      case errors of
          [] -> return ()
          _  -> (liftIO . throwIO . mkSrcErr . listToBag) errors
      where
          errors = S.foldr go [] pkgs
          go pkg acc
              | trusted $ getInstalledPackageDetails dflags pkg
              = acc
              | otherwise
              = (:acc) $ mkErrMsg dflags noSrcSpan (pkgQual dflags)
                     $ text "The package (" <> ppr pkg <> text ") is required" <>
                       text " to be trusted but it isn't!"
  
  -- | Set module to unsafe and (potentially) wipe trust information.
  --
  -- Make sure to call this method to set a module to inferred unsafe, it should
  -- be a central and single failure method. We only wipe the trust information
  -- when we aren't in a specific Safe Haskell mode.
  --
  -- While we only use this for recording that a module was inferred unsafe, we
  -- may call it on modules using Trustworthy or Unsafe flags so as to allow
  -- warning flags for safety to function correctly. See Note [Safe Haskell
  -- Inference].
  markUnsafeInfer :: TcGblEnv -> WarningMessages -> Hsc TcGblEnv
  markUnsafeInfer tcg_env whyUnsafe = do
      dflags <- getDynFlags
  
      when (wopt Opt_WarnUnsafe dflags)
           (logWarnings $ unitBag $
               mkPlainWarnMsg dflags (warnUnsafeOnLoc dflags) (whyUnsafe' dflags))
  
      liftIO $ writeIORef (tcg_safeInfer tcg_env) False
      -- NOTE: Only wipe trust when not in an explicity safe haskell mode. Other
      -- times inference may be on but we are in Trustworthy mode -- so we want
      -- to record safe-inference failed but not wipe the trust dependencies.
      case safeHaskell dflags == Sf_None of
        True  -> return $ tcg_env { tcg_imports = wiped_trust }
        False -> return tcg_env
  
    where
      wiped_trust   = (tcg_imports tcg_env) { imp_trust_pkgs = S.empty }
      pprMod        = ppr $ moduleName $ tcg_mod tcg_env
      whyUnsafe' df = vcat [ quotes pprMod <+> text "has been inferred as unsafe!"
                           , text "Reason:"
                           , nest 4 $ (vcat $ badFlags df) $+$
                                      (vcat $ pprErrMsgBagWithLoc whyUnsafe) $+$
                                      (vcat $ badInsts $ tcg_insts tcg_env)
                           ]
      badFlags df   = concat $ map (badFlag df) unsafeFlagsForInfer
      badFlag df (str,loc,on,_)
          | on df     = [mkLocMessage SevOutput (loc df) $
                              text str <+> text "is not allowed in Safe Haskell"]
          | otherwise = []
      badInsts insts = concat $ map badInst insts
  
      checkOverlap (NoOverlap _) = False
      checkOverlap _             = True
  
      badInst ins | checkOverlap (overlapMode (is_flag ins))
                  = [mkLocMessage SevOutput (nameSrcSpan $ getName $ is_dfun ins) $
                        ppr (overlapMode $ is_flag ins) <+>
                        text "overlap mode isn't allowed in Safe Haskell"]
                  | otherwise = []
  
  
  -- | Figure out the final correct safe haskell mode
  hscGetSafeMode :: TcGblEnv -> Hsc SafeHaskellMode
  hscGetSafeMode tcg_env = do
      dflags  <- getDynFlags
      liftIO $ finalSafeMode dflags tcg_env
  
  --------------------------------------------------------------
  -- Simplifiers
  --------------------------------------------------------------
  
  hscSimplify :: HscEnv -> ModGuts -> IO ModGuts
  hscSimplify hsc_env modguts = runHsc hsc_env $ hscSimplify' modguts
  
  hscSimplify' :: ModGuts -> Hsc ModGuts
  hscSimplify' ds_result = do
      hsc_env <- getHscEnv
      {-# SCC "Core2Core" #-}
        liftIO $ core2core hsc_env ds_result
  
  --------------------------------------------------------------
  -- Interface generators
  --------------------------------------------------------------
  
  hscSimpleIface :: HscEnv
                 -> TcGblEnv
                 -> Maybe Fingerprint
                 -> IO (ModIface, Bool, ModDetails)
  hscSimpleIface hsc_env tc_result mb_old_iface
      = runHsc hsc_env $ hscSimpleIface' tc_result mb_old_iface
  
  hscSimpleIface' :: TcGblEnv
                  -> Maybe Fingerprint
                  -> Hsc (ModIface, Bool, ModDetails)
  hscSimpleIface' tc_result mb_old_iface = do
      hsc_env   <- getHscEnv
      details   <- liftIO $ mkBootModDetailsTc hsc_env tc_result
      safe_mode <- hscGetSafeMode tc_result
      (new_iface, no_change)
          <- {-# SCC "MkFinalIface" #-}
             ioMsgMaybe $
                 mkIfaceTc hsc_env mb_old_iface safe_mode details tc_result
      -- And the answer is ...
      liftIO $ dumpIfaceStats hsc_env
      return (new_iface, no_change, details)
  
  hscNormalIface :: HscEnv
                 -> ModGuts
                 -> Maybe Fingerprint
                 -> IO (ModIface, Bool, ModDetails, CgGuts)
  hscNormalIface hsc_env simpl_result mb_old_iface =
      runHsc hsc_env $ hscNormalIface' simpl_result mb_old_iface
  
  hscNormalIface' :: ModGuts
                  -> Maybe Fingerprint
                  -> Hsc (ModIface, Bool, ModDetails, CgGuts)
  hscNormalIface' simpl_result mb_old_iface = do
      hsc_env <- getHscEnv
      (cg_guts, details) <- {-# SCC "CoreTidy" #-}
                            liftIO $ tidyProgram hsc_env simpl_result
  
      -- BUILD THE NEW ModIface and ModDetails
      --  and emit external core if necessary
      -- This has to happen *after* code gen so that the back-end
      -- info has been set. Not yet clear if it matters waiting
      -- until after code output
      (new_iface, no_change)
          <- {-# SCC "MkFinalIface" #-}
             ioMsgMaybe $
                 mkIface hsc_env mb_old_iface details simpl_result
  
      liftIO $ dumpIfaceStats hsc_env
  
      -- Return the prepared code.
      return (new_iface, no_change, details, cg_guts)
  
  --------------------------------------------------------------
  -- BackEnd combinators
  --------------------------------------------------------------
  
  hscWriteIface :: DynFlags -> ModIface -> Bool -> ModSummary -> IO ()
  hscWriteIface dflags iface no_change mod_summary = do
      let ifaceFile = ml_hi_file (ms_location mod_summary)
      unless no_change $
          {-# SCC "writeIface" #-}
          writeIfaceFile dflags ifaceFile iface
      whenGeneratingDynamicToo dflags $ do
          -- TODO: We should do a no_change check for the dynamic
          --       interface file too
          -- TODO: Should handle the dynamic hi filename properly
          let dynIfaceFile = replaceExtension ifaceFile (dynHiSuf dflags)
              dynIfaceFile' = addBootSuffix_maybe (mi_boot iface) dynIfaceFile
              dynDflags = dynamicTooMkDynamicDynFlags dflags
          writeIfaceFile dynDflags dynIfaceFile' iface
  
  -- | Compile to hard-code.
  hscGenHardCode :: HscEnv -> CgGuts -> ModSummary -> FilePath
                 -> IO (FilePath, Maybe FilePath) -- ^ @Just f@ <=> _stub.c is f
  hscGenHardCode hsc_env cgguts mod_summary output_filename = do
          let CgGuts{ -- This is the last use of the ModGuts in a compilation.
                      -- From now on, we just use the bits we need.
                      cg_module   = this_mod,
                      cg_binds    = core_binds,
                      cg_tycons   = tycons,
                      cg_foreign  = foreign_stubs,
                      cg_dep_pkgs = _dependencies,
                      cg_hpc_info = hpc_info } = cgguts
              dflags = hsc_dflags hsc_env
              location = ms_location mod_summary
              data_tycons = filter isDataTyCon tycons
              -- cg_tycons includes newtypes, for the benefit of External Core,
              -- but we don't generate any code for newtypes
  
          -------------------
          -- PREPARE FOR CODE GENERATION
          -- Do saturation and convert to A-normal form
          prepd_binds <- {-# SCC "CorePrep" #-}
                         corePrepPgm hsc_env this_mod location core_binds data_tycons ;
          -----------------  Convert to STG ------------------
          (stg_binds, _cost_centre_info)
              <- {-# SCC "CoreToStg" #-}
                 myCoreToStg dflags this_mod prepd_binds
  
          let modClass = moduleJavaClass this_mod
          modClasses <- codeGen hsc_env this_mod location data_tycons stg_binds hpc_info
                                (lookupStubs modClass foreign_stubs)
          let stubClasses = outputForeignStubs dflags foreign_stubs modClass
              classes = stubClasses ++ modClasses
              jarContents = map (classFilePath &&& classFileBS) classes
          -- createEmptyJar output_filename
          addMultiByteStringsToJar' (gopt Opt_NormalizeJar dflags) output_filename
                                    (compressionMethod dflags) jarContents
          return (output_filename, Nothing)
  
  outputForeignStubs :: DynFlags -> ForeignStubs -> T.Text -> [ClassFile]
  outputForeignStubs _dflags NoStubs _ = []
  outputForeignStubs _dflags (ForeignStubs _ _ classExports) modClass =
    map f $ filter (\(cls, _) -> cls /= modClass) $ foreignExportsList classExports
    where f (classSpec, (methodDefs, fieldDefs)) =
            mkClassFile java7 [Public, Super] (jvmify className) (Just superClass)
              interfaces fieldDefs methodDefs''
            where className':specs = T.words classSpec
                  className = jvmify className'
                  methodDefs' = methodDefs
                  methodDefs'' = if hasConstructor
                                 then methodDefs'
                                 else  mkDefaultConstructor className superClass
                                     : methodDefs'
                  hasConstructor = any (\(MethodDef _ (UName n) _ _ _) ->
                                          n == "<init>") methodDefs
                  (superClass, interfaces) = parseSpecs specs jobjectC []
          parseSpecs ("extends":superClass:xs) _ is = parseSpecs xs (jvmify superClass) is
          parseSpecs ("implements":interface:xs) sc is = parseSpecs xs sc (jvmify interface:is)
          parseSpecs [] sc is = (sc, reverse is)
          parseSpecs _ _ _ = error $ "Invalid foreign export spec."
          jvmify = T.map (\c -> if c == '.' then '/' else c)
  
  hscInteractive :: HscEnv
                 -> CgGuts
                 -> ModSummary
                 -> IO [ClassFile]
  #ifdef ETA_REPL
  hscInteractive hsc_env cgguts mod_summary = do
      let dflags = hsc_dflags hsc_env
          CgGuts{ -- This is the last use of the ModGuts in a compilation.
                  -- From now on, we just use the bits we need.
                 cg_module   = this_mod,
                 cg_binds    = core_binds,
                 cg_tycons   = tycons,
                 cg_foreign  = foreign_stubs } = cgguts
  
          location = ms_location mod_summary
          data_tycons = filter isDataTyCon tycons
          -- cg_tycons includes newtypes, for the benefit of External Core,
          -- but we don't generate any code for newtypes
  
      -------------------
      -- PREPARE FOR CODE GENERATION
      -- Do saturation and convert to A-normal form
      prepd_binds <- {-# SCC "CorePrep" #-}
                     corePrepPgm hsc_env this_mod location core_binds data_tycons
  
      (stg_binds, _cost_centre_info)
          <- {-# SCC "CoreToStg" #-}
              myCoreToStg dflags this_mod prepd_binds
  
      let modClass = moduleJavaClass this_mod
      modClasses <- codeGen hsc_env this_mod location data_tycons stg_binds
                      (panic "hpc_info") (lookupStubs modClass foreign_stubs)
      let stubClasses = outputForeignStubs dflags foreign_stubs modClass
          classes = modClasses ++ stubClasses
      return classes
  #else
  hscInteractive _ _ = panic "GHC not compiled with interpreter"
  #endif
  
  myCoreToStg :: DynFlags -> Module -> CoreProgram
              -> IO ( [StgBinding] -- output program
                    , CollectedCCs) -- cost centre info (declared and used)
  myCoreToStg dflags this_mod prepd_binds = do
      stg_binds
          <- {-# SCC "Core2Stg" #-}
             coreToStg dflags this_mod prepd_binds
  
      (stg_binds2, cost_centre_info)
          <- {-# SCC "Stg2Stg" #-}
             stg2stg dflags this_mod stg_binds
  
      return (stg_binds2, cost_centre_info)
  
  
  {- **********************************************************************
  %*                                                                      *
  \subsection{Compiling a do-statement}
  %*                                                                      *
  %********************************************************************* -}
  
  {-
  When the UnlinkedBCOExpr is linked you get an HValue of type *IO [HValue]* When
  you run it you get a list of HValues that should be the same length as the list
  of names; add them to the ClosureEnv.
  
  A naked expression returns a singleton Name [it]. The stmt is lifted into the
  IO monad as explained in Note [Interactively-bound Ids in GHCi] in HscTypes
  -}
  
  #ifdef ETA_REPL
  -- | Compile a stmt all the way to an HValue, but don't run it
  --
  -- We return Nothing to indicate an empty statement (or comment only), not a
  -- parse error.
  hscStmt :: HscEnv -> String -> IO (Maybe (Either Reinterpret ([Id], ForeignHValue, FixityEnv)))
  hscStmt hsc_env stmt = hscStmtWithLocation hsc_env stmt "<interactive>" 1
  
  -- | Compile a stmt all the way to an HValue, but don't run it
  --
  -- We return Nothing to indicate an empty statement (or comment only), not a
  -- parse error.
  hscStmtWithLocation :: HscEnv
                      -> String -- ^ The statement
                      -> String -- ^ The source
                      -> Int    -- ^ Starting line
                      -> IO ( Maybe (Either Reinterpret ([Id]
                            , ForeignHValue {- IO [HValue] -}
                            , FixityEnv)))
  hscStmtWithLocation hsc_env0 stmt source linenumber =
    runInteractiveHsc hsc_env0 $ do
      maybe_stmt <- hscParseStmtWithLocation source linenumber stmt
      case maybe_stmt of
        Nothing -> return Nothing
  
        Just parsed_stmt -> do
          hsc_env <- getHscEnv
          liftIO $ hscParsedStmt hsc_env parsed_stmt
  
  hscParsedStmt :: HscEnv
                -> GhciLStmt RdrName  -- ^ The parsed statement
                -> IO ( Maybe (Either Reinterpret ([Id]
                      , ForeignHValue {- IO [HValue] -}
                      , FixityEnv)))
  hscParsedStmt hsc_env stmt = runInteractiveHsc hsc_env $ do
    -- Rename and typecheck it
    eResult <- ioMsgMaybe $ tcRnStmt hsc_env stmt
  
    case eResult of
      Right (ids, tc_expr, fix_env) -> do
  
          -- Desugar it
          ds_expr <- ioMsgMaybe $ deSugarExpr hsc_env tc_expr
          liftIO (lintInteractiveExpr "desugar expression" hsc_env ds_expr)
          handleWarnings
  
          -- Then code-gen, and link it
          -- It's important NOT to have package 'interactive' as thisUnitId
          -- for linking, else we try to link 'main' and can't find it.
          -- Whereas the linker already knows to ignore 'interactive'
          let src_span = srcLocSpan interactiveSrcLoc
          -- TODO: Allow hooks to work
          hval <- liftIO $ hscCompileCoreExpr hsc_env src_span ds_expr
  
          return $ Just $ Right (ids, hval, fix_env)
      Left reinterpret -> return $ Just $ Left reinterpret
  
  -- | Compile a decls
  hscDecls :: HscEnv
           -> String -- ^ The statement
           -> IO ([TyThing], InteractiveContext)
  hscDecls hsc_env str = hscDeclsWithLocation hsc_env str "<interactive>" 1
  
  -- | Compile a decls
  hscDeclsWithLocation :: HscEnv
                       -> String -- ^ The statement
                       -> String -- ^ The source
                       -> Int    -- ^ Starting line
                       -> IO ([TyThing], InteractiveContext)
  hscDeclsWithLocation hsc_env0 str source linenumber =
   runInteractiveHsc hsc_env0 $ do
      L _ (HsModule{ hsmodDecls = decls }) <-
          hscParseThingWithLocation source linenumber parseModule str
  
      {- Rename and typecheck it -}
      hsc_env <- getHscEnv
      tc_gblenv <- ioMsgMaybe $ tcRnDeclsi hsc_env decls
  
      {- Grab the new instances -}
      -- We grab the whole environment because of the overlapping that may have
      -- been done. See the notes at the definition of InteractiveContext
      -- (ic_instances) for more details.
      let defaults = tcg_default tc_gblenv
          dflags = hsc_dflags hsc_env
  
      {- Desugar it -}
      -- We use a basically null location for iNTERACTIVE
      let iNTERACTIVELoc = ModLocation{ ml_hs_file   = Nothing,
                                        ml_hi_file   = panic "hsDeclsWithLocation:ml_hi_file",
                                        ml_obj_file  = panic "hsDeclsWithLocation:ml_hi_file"}
      ds_result <- hscDesugar' iNTERACTIVELoc tc_gblenv
  
      {- Simplify -}
      simpl_mg <- liftIO $ hscSimplify hsc_env ds_result
      -- simpl_mg <- liftIO $ do
      --   plugins <- readIORef (tcg_th_coreplugins tc_gblenv)
      --   hscSimplify hsc_env plugins ds_result
  
      {- Tidy -}
      (tidy_cg, mod_details) <- liftIO $ tidyProgram hsc_env simpl_mg
  
      let !CgGuts{ cg_module    = this_mod,
                   cg_binds     = core_binds,
                   cg_tycons    = tycons,
                   cg_foreign   = foreign_stubs } = tidy_cg
  
          !ModDetails { md_insts     = cls_insts
                      , md_fam_insts = fam_insts } = mod_details
              -- Get the *tidied* cls_insts and fam_insts
  
          data_tycons = filter isDataTyCon tycons
  
      {- Prepare For Code Generation -}
      -- Do saturation and convert to A-normal form
      prepd_binds <- {-# SCC "CorePrep" #-}
        liftIO $ corePrepPgm hsc_env this_mod iNTERACTIVELoc core_binds data_tycons
  
      (stg_binds, _cost_centre_info)
          <- {-# SCC "CoreToStg" #-}
              liftIO $ myCoreToStg dflags this_mod prepd_binds
  
      let modClass = moduleJavaClass this_mod
      modClasses <- liftIO $ codeGen hsc_env this_mod iNTERACTIVELoc data_tycons
                      stg_binds (panic "hpc_info") (lookupStubs modClass foreign_stubs)
      let stubClasses = outputForeignStubs dflags foreign_stubs modClass
          classes = modClasses ++ stubClasses
  
      liftIO $ linkClasses hsc_env (forceClasses classes)
  
      -- let src_span = srcLocSpan interactiveSrcLoc
  
      let tcs = filterOut isImplicitTyCon (mg_tcs simpl_mg)
          patsyns = mg_patsyns simpl_mg
  
          ext_ids = [ id | id <- bindersOfBinds core_binds
                         , isExternalName (idName id)
                         , not (isDFunId id || isImplicitId id) ]
              -- We only need to keep around the external bindings
              -- (as decided by TidyPgm), since those are the only ones
              -- that might later be looked up by name.  But we can exclude
              --    - DFunIds, which are in 'cls_insts' (see Note [ic_tythings] in HscTypes
              --    - Implicit Ids, which are implicit in tcs
              -- c.f. TcRnDriver.runTcInteractive, which reconstructs the TypeEnv
  
          new_tythings = map AnId ext_ids ++ map ATyCon tcs ++ map (AConLike . PatSynCon) patsyns
          ictxt        = hsc_IC hsc_env
          -- See Note [Fixity declarations in GHCi]
          fix_env      = tcg_fix_env tc_gblenv
          new_ictxt    = extendInteractiveContext ictxt new_tythings cls_insts
                                                  fam_insts defaults fix_env
      return (new_tythings, new_ictxt)
  
  {-
    Note [Fixity declarations in GHCi]
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
    To support fixity declarations on types defined within GHCi (as requested
    in #10018) we record the fixity environment in InteractiveContext.
    When we want to evaluate something TcRnDriver.runTcInteractive pulls out this
    fixity environment and uses it to initialize the global typechecker environment.
    After the typechecker has finished its business, an updated fixity environment
    (reflecting whatever fixity declarations were present in the statements we
    passed it) will be returned from hscParsedStmt. This is passed to
    updateFixityEnv, which will stuff it back into InteractiveContext, to be
    used in evaluating the next statement.
  
  -}
  
  hscImport :: HscEnv -> String -> IO (ImportDecl RdrName)
  hscImport hsc_env str = runInteractiveHsc hsc_env $ do
      (L _ (HsModule{hsmodImports=is})) <-
         hscParseThing parseModule str
      case is of
          [L _ i] -> return i
          _ -> liftIO $ throwOneError $
                   mkPlainErrMsg (hsc_dflags hsc_env) noSrcSpan $
                       text "parse error in import declaration"
  
  -- | Typecheck an expression (but don't run it)
  hscTcExpr :: HscEnv
            -> String -- ^ The expression
            -> IO Type
  hscTcExpr hsc_env0 expr = runInteractiveHsc hsc_env0 $ do
    hsc_env <- getHscEnv
    parsed_expr <- hscParseExpr expr
    ioMsgMaybe $ tcRnExpr hsc_env (noLoc parsed_expr)
  
  -- | Find the kind of a type
  -- Currently this does *not* generalise the kinds of the type
  hscKcType
    :: HscEnv
    -> Bool            -- ^ Normalise the type
    -> String          -- ^ The type as a string
    -> IO (Type, Kind) -- ^ Resulting type (possibly normalised) and kind
  hscKcType hsc_env0 normalise str = runInteractiveHsc hsc_env0 $ do
      hsc_env <- getHscEnv
      ty <- hscParseType str
      ioMsgMaybe $ tcRnType hsc_env normalise ty
  
  hscParseExpr :: String -> Hsc (HsExpr RdrName)
  hscParseExpr expr = do
    hsc_env <- getHscEnv
    maybe_stmt <- hscParseStmt expr
    case maybe_stmt of
      Just (L _ (BodyStmt expr _ _ _)) -> return (unLoc expr)
      _ -> throwErrors $ unitBag $ mkPlainErrMsg (hsc_dflags hsc_env) noSrcSpan
        (text "not an expression:" <+> quotes (text expr))
  
  hscParseStmt :: String -> Hsc (Maybe (GhciLStmt RdrName))
  hscParseStmt = hscParseThing parseStmt
  
  hscParseStmtWithLocation :: String -> Int -> String
                           -> Hsc (Maybe (GhciLStmt RdrName))
  hscParseStmtWithLocation source linenumber stmt =
      hscParseThingWithLocation source linenumber parseStmt stmt
  
  hscParseType :: String -> Hsc (LHsType RdrName)
  hscParseType = hscParseThing parseType
  
  #endif
  
  hscParseIdentifier :: HscEnv -> String -> IO (Located RdrName)
  hscParseIdentifier hsc_env str =
      runInteractiveHsc hsc_env $ hscParseThing parseIdentifier str
  
  hscParseThing :: (Outputable thing, Data thing)
                => Lexer.P thing -> String -> Hsc thing
  hscParseThing = hscParseThingWithLocation "<interactive>" 1
  
  hscParseThingWithLocation :: (Outputable thing, Data thing) => String -> Int
                            -> Lexer.P thing -> String -> Hsc thing
  hscParseThingWithLocation source linenumber parser str
    = {-# SCC "Parser" #-} do
      -- withTiming getDynFlags
      --            (text "Parser [source]")
      --            (const ()) $
      dflags <- getDynFlags
      liftIO $ showPass dflags "Parser"
  
      let buf = stringToStringBuffer str
          loc = mkRealSrcLoc (fsLit source) linenumber 1
  
      case unP parser (mkPState dflags buf loc) of
          PFailed span err ->
                liftIO $ throwOneError (mkPlainErrMsg dflags span err)
          -- PFailed warnFn span err -> do
          --     logWarningsReportErrors (warnFn dflags)
          --     handleWarnings
          --     let msg = mkPlainErrMsg dflags span err
          --     throwErrors $ unitBag msg
  
          POk pst thing -> do
              logWarningsReportErrors (getMessages pst)
              liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr thing)
              return thing
          -- POk pst thing -> do
          --     logWarningsReportErrors (getMessages pst dflags)
          --     liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr thing)
              -- liftIO $ dumpIfSet_dyn dflags Opt_D_dump_parsed_ast "Parser AST" $
              --                        showAstData NoBlankSrcSpan thing
              -- return thing
  
  hscCompileCore :: HscEnv -> Bool -> SafeHaskellMode -> ModSummary
                 -> CoreProgram -> FilePath -> IO ()
  hscCompileCore hsc_env simplify safe_mode mod_summary binds output_filename
    = runHsc hsc_env $ do
          guts <- maybe_simplify (mkModGuts (ms_mod mod_summary) safe_mode binds)
          (iface, changed, _details, cgguts) <- hscNormalIface' guts Nothing
          liftIO $ hscWriteIface (hsc_dflags hsc_env) iface changed mod_summary
          _ <- liftIO $ hscGenHardCode hsc_env cgguts mod_summary output_filename
          return ()
  
    where
      maybe_simplify mod_guts | simplify = hscSimplify' mod_guts
                              | otherwise = return mod_guts
  
  -- Makes a "vanilla" ModGuts.
  mkModGuts :: Module -> SafeHaskellMode -> CoreProgram -> ModGuts
  mkModGuts mod safe binds =
      ModGuts {
          mg_module       = mod,
          mg_hsc_src      = HsSrcFile,
          mg_exports      = [],
          mg_usages       = [],
          mg_deps         = noDependencies,
          mg_used_th      = False,
          mg_rdr_env      = emptyGlobalRdrEnv,
          mg_fix_env      = emptyFixityEnv,
          mg_tcs          = [],
          mg_insts        = [],
          mg_fam_insts    = [],
          mg_patsyns      = [],
          mg_rules        = [],
          mg_vect_decls   = [],
          mg_binds        = binds,
          mg_foreign      = NoStubs,
          mg_warns        = NoWarnings,
          mg_anns         = [],
          mg_hpc_info     = emptyHpcInfo False,
          mg_modBreaks    = emptyModBreaks,
          mg_vect_info    = noVectInfo,
          mg_inst_env     = emptyInstEnv,
          mg_fam_inst_env = emptyFamInstEnv,
          mg_safe_haskell = safe,
          mg_trust_pkg    = False
      }
  
  
  {- **********************************************************************
  %*                                                                      *
          Desugar, simplify, convert to bytecode, and link an expression
  %*                                                                      *
  %********************************************************************* -}
  
  #ifdef ETA_REPL
  
  hscCompileCoreExpr :: HscEnv -> SrcSpan -> CoreExpr -> IO ForeignHValue
  hscCompileCoreExpr hsc_env =
    lookupHook hscCompileCoreExprHook hscCompileCoreExpr' (hsc_dflags hsc_env) hsc_env
  
  hscCompileCoreExpr' :: HscEnv -> SrcSpan -> CoreExpr -> IO ForeignHValue
  hscCompileCoreExpr' hsc_env _srcspan ds_expr
      = do { let dflags = hsc_dflags hsc_env
  
             {- Simplify it -}
           ; simpl_expr <- simplifyExpr dflags ds_expr
  
             {- Tidy it (temporary, until coreSat does cloning) -}
           ; let tidy_expr = tidyExpr emptyTidyEnv simpl_expr
  
             {- Prepare for codegen -}
           ; prepd_expr <- corePrepExpr dflags hsc_env tidy_expr
  
             {- Lint if necessary -}
           ; lintInteractiveExpr "hscCompileExpr" hsc_env prepd_expr
  
           ; exprNo <- icExprCounterInc (hsc_IC hsc_env)
  
           -----------------  Convert to STG ------------------
           ; let exprFS = fsLit "$expr"
                 this_mod0 = icInteractiveModule (hsc_IC hsc_env)
                 this_mod =
                     this_mod0 { moduleName =
                                 mkModuleName $ moduleNameString (moduleName this_mod0)
                                             ++ "_" ++ show exprNo }
  
                 exprName = mkExternalName (getUnique exprFS)
                              this_mod (mkVarOccFS exprFS)
                              noSrcSpan
                 -- Create an id to keep the codegen happy
                 exprId = mkVanillaGlobal exprName
                            (exprType prepd_expr)
                 prepd_binds = [NonRec exprId prepd_expr]
                 -- Stub location to keep the codegen happy
                 mod_location =
                   ModLocation { ml_hs_file = Just "Interactive.hs"
                               , ml_hi_file = "Interactive.hi"
                               , ml_obj_file = "Interactive.jar" }
  
           ; (stg_binds, _cost_centre_info)
               <- {-# SCC "CoreToStg" #-}
                  myCoreToStg dflags this_mod prepd_binds
  
             {- link it -}
           ; modClasses <- codeGen hsc_env this_mod mod_location
                             [] stg_binds (panic "hpcInfo") Nothing
  
           ; hval <- linkExpr hsc_env (T.unpack $ moduleJavaClass this_mod)
                                      (T.unpack $ idNameText dflags exprId) modClasses
  
           ; return hval }
  
  
  #endif
  
  {- **********************************************************************
  %*                                                                      *
          Statistics on reading interfaces
  %*                                                                      *
  %********************************************************************* -}
  
  dumpIfaceStats :: HscEnv -> IO ()
  dumpIfaceStats hsc_env = do
      eps <- readIORef (hsc_EPS hsc_env)
      dumpIfSet dflags (dump_if_trace || dump_rn_stats)
                "Interface statistics"
                (ifaceStats eps)
    where
      dflags = hsc_dflags hsc_env
      dump_rn_stats = dopt Opt_D_dump_rn_stats dflags
      dump_if_trace = dopt Opt_D_dump_if_trace dflags
  
  
  {- **********************************************************************
  %*                                                                      *
          Progress Messages: Module i of n
  %*                                                                      *
  %********************************************************************* -}
  
  showModuleIndex :: (Int, Int) -> String
  showModuleIndex (i,n) = "[" ++ padded ++ " of " ++ n_str ++ "] "
    where
      n_str = show n
      i_str = show i
      padded = replicate (length n_str - length i_str) ' ' ++ i_str
  