aboutsummaryrefslogtreecommitdiff
path: root/src/HaskellCodeExplorer/PackageInfo.hs
blob: 8ba3abd020db2779f420e803766c88da9fd40b8b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
{-# LANGUAGE CPP #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE Rank2Types #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}

module HaskellCodeExplorer.PackageInfo
  ( createPackageInfo
  , ghcVersion
  ) where

import Control.DeepSeq(deepseq)
import Control.Exception
  ( IOException
  , SomeAsyncException
  , SomeException
  , fromException
  , throw
  , try
  )
import Control.Monad (foldM, join, unless)
import Control.Monad.Extra (anyM, findM)
import Control.Monad.Logger
  ( LoggingT(..)
  , MonadLogger(..)
  , MonadLoggerIO(..)
  , logDebugN
  , logErrorN
  , logInfoN
  )
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as BSC
import qualified Data.HashMap.Strict as HM
import Data.IORef (readIORef)
import qualified Data.IntMap.Strict as IM
import qualified Data.List as L
import Data.Maybe (fromMaybe, isJust, maybeToList)
import qualified Data.Set as S
import qualified Data.Text as T
import qualified Data.Text.Encoding as TE
import Data.Version (Version(..), showVersion, parseVersion)
import Text.ParserCombinators.ReadP (readP_to_S)
import Digraph (flattenSCCs)
import Distribution.Helper
  ( ChComponentName(..)
  , ChEntrypoint(..)
  , ChModuleName(..)
  , components
  , entrypoints
  , ghcOptions
  , mkQueryEnv
  , packageId
  , runQuery
  , sourceDirs
  )
import DynFlags
  ( DynFlags(..)
  , GeneralFlag(..)
  , GhcMode(..)
  , WarnReason(..)
  , gopt_set
  , parseDynamicFlagsCmdLine
  )
import Exception (ExceptionMonad(..), ghandle)
import GHC
  ( GhcLink(..)
  , HscTarget(..)
  , LoadHowMuch(..)
  , ModLocation(..)
  , ModSummary(..)
  , Severity
  , SrcSpan
  , getModuleGraph
  , getSession
  , getSessionDynFlags
  , guessTarget
  , load
  , noLoc
  , parseModule
  , runGhcT
  , setSessionDynFlags
  , setTargets
  , topSortModuleGraph
  , typecheckModule
  , moduleNameString
  , moduleName  
  )
import GHC.Paths (libdir)
import GhcMonad (GhcT(..), liftIO)
import HaskellCodeExplorer.GhcUtils (isHsBoot,toText)
import HaskellCodeExplorer.ModuleInfo (ModuleDependencies, createModuleInfo)
import qualified HaskellCodeExplorer.Types as HCE
import HscTypes (hsc_EPS, hsc_HPT)
import Outputable (PprStyle, SDoc, neverQualify, showSDocForUser)
import Packages (initPackages)
import Prelude hiding (id)
import System.Directory
  ( doesFileExist  
  , findExecutable
  , setCurrentDirectory
  , getCurrentDirectory
  , makeAbsolute
  )
import qualified System.Directory.Tree as DT
import System.Exit (exitFailure)
import System.FilePath
  ( (</>)
  , addTrailingPathSeparator
  , joinPath
  , normalise
  , replaceExtension
  , splitPath
  , takeExtension
  , takeBaseName
  , takeDirectory
  , splitDirectories  
  )
import System.FilePath.Find
import System.IO (IOMode(..), withFile)
import System.Process (readProcess)

createPackageInfo ::
     FilePath -- ^ Path to a Cabal package
  -> Maybe FilePath -- ^ Relative path to a dist directory
  -> HCE.SourceCodePreprocessing -- ^ Before or after preprocessor
  -> [String] -- ^ Options for GHC
  -> [String] -- ^ Directories to ignore
  -> LoggingT IO (HCE.PackageInfo HCE.ModuleInfo)
createPackageInfo packageDirectoryPath mbDistDirRelativePath sourceCodePreprocessing additionalGhcOptions ignoreDirectories = do
  packageDirectoryAbsPath <- liftIO $ makeAbsolute packageDirectoryPath
  currentDirectory <- liftIO getCurrentDirectory
  liftIO $ setCurrentDirectory packageDirectoryAbsPath
  distDir <-
    case mbDistDirRelativePath of
      Just path -> return $ packageDirectoryAbsPath </> path
      Nothing -> do
        eitherDistDir <- findDistDirectory packageDirectoryAbsPath
        case eitherDistDir of
          Right distDir -> return distDir
          Left errorMessage ->
            logErrorN (T.pack errorMessage) >> liftIO exitFailure
  eitherPackageGhcVersion <- liftIO $ getPackageGhcVersion distDir
  case eitherPackageGhcVersion of
    Right packageGhcVersion ->
      if take 2 (versionBranch packageGhcVersion) == take 2 (versionBranch ghcVersion)
        then return ()
        else let message =
                   "GHC version mismatch. haskell-code-indexer: " ++
                   showVersion ghcVersion ++
                   ", package: " ++
                   showVersion packageGhcVersion
              in logErrorN (T.pack message) >> liftIO exitFailure
    Left err -> logErrorN (T.pack err) >> liftIO exitFailure
  let cabalHelperQueryEnv = mkQueryEnv packageDirectoryAbsPath distDir
  ((packageName, packageVersion), compInfo) <-
    liftIO $
    runQuery
      cabalHelperQueryEnv
      ((,) <$> packageId <*>
       (zip3 <$> components ((,) <$> ghcOptions) <*>
        components ((,) <$> entrypoints) <*>
        components ((,) <$> sourceDirs)))
  let currentPackageId = HCE.PackageId (T.pack packageName) packageVersion
  logInfoN $ T.append "Indexing " $ HCE.packageIdToText currentPackageId
  let buildComponents =
        L.map
          (\((options, compName), (entrypoint, _), (srcDirs, _)) ->
             ( chComponentNameToComponentId compName
             , options
             , chEntrypointsToModules entrypoint
             , srcDirs
             , chComponentNameToComponentType compName)) .
        L.sortBy
          (\((_, compName1), _, _) ((_, compName2), _, _) ->
             compare compName1 compName2) $
        compInfo
      libSrcDirs =
        concatMap (\(_, _, _, srcDirs, _) -> srcDirs) .
        filter (\(_, _, _, _, compType) -> HCE.isLibrary compType) $
        buildComponents
  (indexedModules, (_fileMapResult, _defSiteMapResult, modNameMapResult)) <-
    foldM
      (\(modules, (fileMap, defSiteMap, modNameMap)) (compId, options, (mbMain, moduleNames), srcDirs, _) -> do
         mbMainPath <-
           case mbMain of
             Just mainPath ->
               liftIO $
               findM doesFileExist $
               mainPath :
               map (\srcDir -> normalise $ srcDir </> mainPath) srcDirs
             Nothing -> return Nothing
         (modules', (fileMap', defSiteMap', modNameMap')) <-
           indexBuildComponent
             sourceCodePreprocessing
             currentPackageId
             compId
             (fileMap, defSiteMap, modNameMap)
             srcDirs
             libSrcDirs
             (options ++ additionalGhcOptions)
             (maybe moduleNames (: moduleNames) mbMainPath)
         return (modules ++ modules', (fileMap', defSiteMap', modNameMap')))
      ([], (HM.empty, HM.empty, HM.empty))
      buildComponents
  let modId = HCE.id :: HCE.ModuleInfo -> HCE.HaskellModulePath
      moduleMap =
        HM.fromList . map (\modInfo -> (modId modInfo, modInfo)) $
        indexedModules
      references = L.foldl' addReferencesFromModule HM.empty indexedModules
      moduleId = HCE.id :: HCE.ModuleInfo -> HCE.HaskellModulePath
      topLevelIdentifiersTrie =
        L.foldl' addTopLevelIdentifiersFromModule HCE.emptyTrie .
        L.filter (not . isHsBoot . moduleId) $
        indexedModules
  directoryTree <-
    liftIO $
    buildDirectoryTree
      packageDirectoryAbsPath
      ignoreDirectories
      (\path -> HM.member (HCE.HaskellModulePath . T.pack $ path) moduleMap)
  liftIO $ setCurrentDirectory currentDirectory
  return
    HCE.PackageInfo
      { id = currentPackageId
      , moduleMap = moduleMap
      , moduleNameMap = modNameMapResult
      , directoryTree = directoryTree
      , externalIdOccMap = references
      , externalIdInfoMap = topLevelIdentifiersTrie
      }
  where
    chEntrypointsToModules :: ChEntrypoint -> (Maybe String, [String])
    chEntrypointsToModules (ChLibEntrypoint modules otherModules signatures) =
      ( Nothing
      , L.map chModuleToString modules ++
        L.map chModuleToString otherModules ++ L.map chModuleToString signatures)
    chEntrypointsToModules (ChExeEntrypoint mainModule _otherModules) =
      (Just mainModule, [])
    chEntrypointsToModules ChSetupEntrypoint = (Nothing, [])
    chModuleToString :: ChModuleName -> String
    chModuleToString (ChModuleName n) = n
    chComponentNameToComponentType :: ChComponentName -> HCE.ComponentType
    chComponentNameToComponentType ChSetupHsName = HCE.Setup
    chComponentNameToComponentType ChLibName = HCE.Lib
    chComponentNameToComponentType (ChSubLibName name) =
      HCE.SubLib $ T.pack name
    chComponentNameToComponentType (ChFLibName name) = HCE.FLib $ T.pack name
    chComponentNameToComponentType (ChExeName name) = HCE.Exe $ T.pack name
    chComponentNameToComponentType (ChTestName name) = HCE.Test $ T.pack name
    chComponentNameToComponentType (ChBenchName name) = HCE.Bench $ T.pack name
    chComponentNameToComponentId :: ChComponentName -> HCE.ComponentId
    chComponentNameToComponentId ChLibName = HCE.ComponentId "lib"
    chComponentNameToComponentId (ChSubLibName name) =
      HCE.ComponentId . T.append "sublib-" . T.pack $ name
    chComponentNameToComponentId (ChFLibName name) =
      HCE.ComponentId . T.append "flib-" . T.pack $ name
    chComponentNameToComponentId (ChExeName name) =
      HCE.ComponentId . T.append "exe-" . T.pack $ name
    chComponentNameToComponentId (ChTestName name) =
      HCE.ComponentId . T.append "test-" . T.pack $ name
    chComponentNameToComponentId (ChBenchName name) =
      HCE.ComponentId . T.append "bench-" . T.pack $ name
    chComponentNameToComponentId ChSetupHsName = HCE.ComponentId "setup"

-- | Parses the header of setup-config file.
-- The header is generated by Cabal:
-- https://github.com/haskell/cabal/blob/5be57c0d251be40a6263cd996d99703b8de1ed79/Cabal/Distribution/Simple/Configure.hs#L286-L295
getPackageGhcVersion :: FilePath -> IO (Either String Version)
getPackageGhcVersion distDir =
  withFile (distDir </> "setup-config") ReadMode $ \handle -> do
    header <- BSC.hGetLine handle
    let parseHeader :: BSC.ByteString -> Maybe BSC.ByteString
        parseHeader hdr =
          case BSC.words hdr of
            ["Saved", "package", "config", "for", _package, "written", "by", _cabal, "using", compiler] ->
              Just compiler
            _ -> Nothing
        parseCompiler :: BSC.ByteString -> Maybe BSC.ByteString
        parseCompiler compiler =
          case BSC.split '-' compiler of
            ["ghc", version] -> Just version
            _ -> Nothing
        parseGhcVersion :: BSC.ByteString -> Maybe Version
        parseGhcVersion version =
          case filter ((== "") . snd) $
               readP_to_S parseVersion $ BSC.unpack version of
            [(ver, "")] -> Just ver
            _ -> Nothing
    case parseHeader header >>= parseCompiler >>= parseGhcVersion of
      Just version -> return $ Right version
      _ ->
        return $
        Left $
        "Unexpected setup-config header: \"" ++
        BSC.unpack header ++
        "\"\nIt may mean that the version of Cabal used to build this package is not supported by haskell-code-indexer yet."

#if MIN_VERSION_GLASGOW_HASKELL(8,6,4,0)
ghcVersion :: Version
ghcVersion = Version {versionBranch = [8, 6, 4, 0], versionTags = []}
#elif MIN_VERSION_GLASGOW_HASKELL(8,6,3,0)     
ghcVersion :: Version
ghcVersion = Version {versionBranch = [8, 6, 3, 0], versionTags = []}    
#elif MIN_VERSION_GLASGOW_HASKELL(8,4,4,0) 
ghcVersion :: Version
ghcVersion = Version {versionBranch = [8, 4, 4, 0], versionTags = []}
#elif MIN_VERSION_GLASGOW_HASKELL(8,4,3,0)
ghcVersion :: Version
ghcVersion = Version {versionBranch = [8, 4, 3, 0], versionTags = []}
#elif MIN_VERSION_GLASGOW_HASKELL(8,2,2,0)
ghcVersion :: Version
ghcVersion = Version {versionBranch = [8, 2, 2, 0], versionTags = []}
#else
ghcVersion :: Version
ghcVersion = Version {versionBranch = [8, 0, 2, 0], versionTags = []}
#endif  
      
buildDirectoryTree :: FilePath -> [FilePath] -> (FilePath -> Bool) -> IO HCE.DirTree
buildDirectoryTree path ignoreDirectories isHaskellModule = do
  (_dir DT.:/ tree) <- DT.readDirectoryWith (const . return $ ()) path
  -- Tuple up the complete file path with the file contents, by building up the path,
  -- trie-style, from the root. The filepath will be relative to "anchored" directory.
  let treeWithPaths = DT.zipPaths ("" DT.:/ DT.filterDir (not . ignore) tree)
  return $ toDirTree (removeTopDir . fst <$> treeWithPaths)
  where
    ignore :: DT.DirTree a -> Bool
    ignore (DT.Dir dirName _)
      | "." `L.isPrefixOf` dirName = True
      | dirName == "dist" = True
      | dirName == "dist-newstyle" = True
      | dirName == "tmp" = True
      | otherwise = dirName `elem` ignoreDirectories
    ignore (DT.Failed _ _) = True
    ignore _ = False
    removeTopDir :: FilePath -> FilePath
    removeTopDir p =
      case splitPath p of
        _x:xs -> joinPath xs
        [] -> ""
    toDirTree :: DT.DirTree FilePath -> HCE.DirTree
    toDirTree (DT.Dir name contents) =
      HCE.Dir name (map toDirTree . filter (not . DT.failed) $ contents)
    toDirTree (DT.File name filePath) =
      HCE.File name filePath (isHaskellModule filePath)
    toDirTree (DT.Failed name err) =
      HCE.File (name ++ " : " ++ show err) "" False
        
addTopLevelIdentifiersFromModule ::
     HCE.Trie Char HCE.ExternalIdentifierInfo
  -> HCE.ModuleInfo
  -> HCE.Trie Char HCE.ExternalIdentifierInfo
addTopLevelIdentifiersFromModule trieIdInfo HCE.ModuleInfo {..} =
  L.foldl'
    (\trie idInfo@(HCE.ExternalIdentifierInfo HCE.IdentifierInfo {..}) ->
       HCE.insertToTrie S.insert (T.unpack demangledOccName) idInfo trie)
    trieIdInfo
    externalIds
  
addReferencesFromModule ::     
     HM.HashMap HCE.ExternalId (S.Set HCE.IdentifierSrcSpan)
  -> HCE.ModuleInfo
  -> HM.HashMap HCE.ExternalId (S.Set HCE.IdentifierSrcSpan)
addReferencesFromModule references modInfo@HCE.ModuleInfo {..} =
  eachIdentifierOccurrence
    references
    modInfo
    (\occMap lineNumber startCol endCol occ ->
       let mbIdExternalId =
             join $
             HCE.externalId <$>
             maybe
               Nothing
               (`HM.lookup` idInfoMap)
               (HCE.internalId (occ :: HCE.IdentifierOccurrence))
           idSrcSpan =
             HCE.IdentifierSrcSpan
               { modulePath = id
               , line = lineNumber
               , startColumn = startCol
               , endColumn = endCol
               }
        in case mbIdExternalId of
             Just externalId ->
               HM.insertWith S.union externalId (S.singleton idSrcSpan) occMap
             Nothing -> occMap)

findDistDirectory :: FilePath -> LoggingT IO (Either String FilePath)
findDistDirectory packagePath = do
  let parents =
        reverse . map joinPath . filter (not . null) . L.inits . splitPath $
        packagePath
  -- e.g., ["/dir/subdir/subsubdir","/dir/subdir/","/dir/","/"]
  hasStackYaml <-
    liftIO $ anyM (\path -> doesFileExist (path </> "stack.yaml")) parents
  mbStackExecutable <- liftIO $ findExecutable "stack"
  case (hasStackYaml, mbStackExecutable) of
    (True, Just stack) -> do
      let removeEndOfLine str
            | null str = str
            | otherwise = init str
      logInfoN
        "Found stack.yaml. Executing \"stack path --dist-dir\" to get dist directory."
      eitherDistDir :: (Either IOException String) <-
        liftIO .
        try . fmap removeEndOfLine . readProcess stack ["path", "--dist-dir"] $
        ""
      case eitherDistDir of
        Right distDir -> do
          logInfoN $ T.append "Stack dist directory : " $ T.pack distDir
          hasSetupConfig <- liftIO $ doesFileExist $ distDir </> "setup-config"
          if hasSetupConfig
            then return $ Right distDir
            else return $
                 Left
                   "Cannot find setup-config file in a dist directory. Has the package been built?"
        Left exception ->
          return $
          Left $
          "Error while executing \"stack path --dist-dir\" : " ++ show exception
    _ -> do
      logInfoN "Trying to find dist directory"
      setupConfigPaths <-
        liftIO $
        map (takeDirectory . normalise) <$>
        find always (fileName ==? "setup-config") "."
      case setupConfigPaths of
        [] ->
          return $
          Left "Cannot find dist directory. Has the package been built?"
        [path] -> do
          logInfoN $ T.append "Found dist directory : " $ T.pack path
          return $ Right path
        _ ->
          return $
          Left $
          "Found multiple possible dist directories : \n" ++
          show setupConfigPaths ++ " \nPlease specify --dist option"
          
eachIdentifierOccurrence ::
     forall a.
     a
  -> HCE.ModuleInfo
  -> (a -> IM.Key -> Int -> Int -> HCE.IdentifierOccurrence -> a)
  -> a
eachIdentifierOccurrence accumulator HCE.ModuleInfo {..} f =
  IM.foldlWithKey'
    (\acc lineNumber occurences ->
       L.foldl'
         (\a ((startCol, endCol), occ) -> f a lineNumber startCol endCol occ)
         acc
         occurences)
    accumulator
    idOccMap

instance ExceptionMonad (LoggingT IO) where
  gcatch act h =
    LoggingT $ \logFn ->
      runLoggingT act logFn `gcatch` \e -> runLoggingT (h e) logFn
  gmask f =
    LoggingT $ \logFn ->
      gmask $ \io_restore ->
        let g_restore (LoggingT m) = LoggingT $ \lf -> io_restore (m lf)
         in runLoggingT (f g_restore) logFn

instance MonadLoggerIO (GhcT (LoggingT IO)) where
  askLoggerIO = GhcT $ const askLoggerIO

instance MonadLogger (GhcT (LoggingT IO)) where
  monadLoggerLog loc source level =
    GhcT . const . monadLoggerLog loc source level

gtrySync :: (ExceptionMonad m) => m a -> m (Either SomeException a)
gtrySync action = ghandleSync (return . Left) (fmap Right action)

ghandleSync :: (ExceptionMonad m) => (SomeException -> m a) -> m a -> m a
ghandleSync onError =
  ghandle
    (\ex ->
       case fromException ex of
         Just (asyncEx :: SomeAsyncException) -> throw asyncEx
         _ -> onError ex)
    
indexBuildComponent ::
     HCE.SourceCodePreprocessing -- ^ Before or after preprocessor
  -> HCE.PackageId -- ^ Current package id
  -> HCE.ComponentId -- ^ Current component id
  -> ModuleDependencies -- ^ Already indexed modules
  -> [FilePath] -- ^ Src dirs
  -> [FilePath] -- ^ Src dirs of libraries
  -> [String] -- ^ Command-line options for GHC
  -> [String] -- ^ Modules to compile
  -> LoggingT IO ([HCE.ModuleInfo],ModuleDependencies)
indexBuildComponent sourceCodePreprocessing currentPackageId componentId deps@(fileMap, defSiteMap, modNameMap) srcDirs libSrcDirs options modules = do
  let onError ex = do
        logErrorN $
          T.concat
            [ "Error while indexing component "
            , HCE.getComponentId componentId
            , " : "
            , T.pack . show $ ex
            ]
        return ([], deps)
  ghandleSync onError $
    runGhcT (Just libdir) $ do
      logDebugN (T.append "Component id : " $ HCE.getComponentId componentId)
      logDebugN (T.append "Modules : " $ T.pack $ show modules)
      logDebugN
        (T.append "GHC command line options : " $
         T.pack $ L.intercalate " " (options ++ modules))
      flags <- getSessionDynFlags
      (flags', _, _) <-
        parseDynamicFlagsCmdLine
          flags
          (L.map noLoc . L.filter ("-Werror" /=) $ options) -- -Werror flag makes warnings fatal
      (flags'', _) <- liftIO $ initPackages flags'
      logFn <- askLoggerIO
      let logAction ::
               DynFlags
            -> WarnReason
            -> Severity
            -> SrcSpan
            -> Outputable.PprStyle
            -> SDoc
            -> IO ()
          logAction fs _reason _severity srcSpan _stype msg =
            runLoggingT
              (logDebugN
                 (T.append "GHC message : " $
                  T.pack $
                  showSDocForUser fs neverQualify msg ++
                  " , SrcSpan : " ++ show srcSpan))
              logFn
          mbTmpDir =
            case hiDir flags'' of
              Just buildDir ->
                Just $ buildDir </> (takeBaseName buildDir ++ "-tmp")
              Nothing -> Nothing
      _ <-
        setSessionDynFlags $
        L.foldl'
          gopt_set
          (flags''
             { hscTarget = HscAsm
             , ghcLink = LinkInMemory
             , ghcMode = CompManager
             , log_action = logAction
             , importPaths = importPaths flags'' ++ maybeToList mbTmpDir
             })
          [Opt_Haddock]
      targets <- mapM (`guessTarget` Nothing) modules
      setTargets targets
      _ <- load LoadAllTargets
      modGraph <- getModuleGraph
      let topSortMods = flattenSCCs (topSortModuleGraph False modGraph Nothing)
          buildDir =
            addTrailingPathSeparator . normalise . fromMaybe "" . hiDir $
            flags''
          pathsModuleName =
            "Paths_" ++
            map
              (\c ->
                 if c == '-'
                   then '_'
                   else c)
              (T.unpack (HCE.name (currentPackageId :: HCE.PackageId)))
      (modSumWithPath, modulesNotFound) <-
        (\(mods, notFound) ->
           ( L.reverse .
             L.foldl'
               (\acc (mbPath, modSum) ->
                  case mbPath of
                    Just path
                      | not $ HM.member path defSiteMap -> (path, modSum) : acc
                    _ -> acc)
               [] $
             mods
           , map snd notFound)) .
        L.partition (\(mbPath, _) -> isJust mbPath) <$>
        mapM
          (\modSum ->
             liftIO $
             (, modSum) <$>
             findHaskellModulePath buildDir (srcDirs ++ libSrcDirs) modSum)
          (filter
             (\modSum ->
                pathsModuleName /=
                (moduleNameString . moduleName $ ms_mod modSum))
             topSortMods)
      unless (null modulesNotFound) $
        logErrorN $
        T.append
          "Cannot find module path : "
          (toText flags'' $ map ms_mod modulesNotFound)
      foldM
        (\(indexedModules, (fileMap', defSiteMap', modNameMap')) (modulePath, modSum) -> do
           result <-
             indexModule
               sourceCodePreprocessing
               componentId
               currentPackageId
               flags''
               (fileMap', defSiteMap', modNameMap')
               (modulePath, modSum)
           case result of
             Right (modInfo, (fileMap'', defSiteMap'', modNameMap'')) ->
               return
                 ( modInfo : indexedModules
                 , (fileMap'', defSiteMap'', modNameMap''))
             Left exception -> do
               logErrorN $
                 T.concat
                   [ "Error while indexing "
                   , T.pack . show $ modulePath
                   , " : "
                   , T.pack . show $ exception
                   ]
               return (indexedModules, (fileMap', defSiteMap', modNameMap')))
        ([], (fileMap, defSiteMap, modNameMap))
        modSumWithPath
          
findHaskellModulePath ::
     FilePath -> [FilePath] -> ModSummary -> IO (Maybe HCE.HaskellModulePath)
findHaskellModulePath buildDir srcDirs modSum =
  case normalise <$> (ml_hs_file . ms_location $ modSum) of
    Just modulePath ->
      let toHaskellModulePath = return . Just . HCE.HaskellModulePath . T.pack
          removeTmpDir path =
            case splitDirectories path of
              parent:rest ->
                if "-tmp" `L.isSuffixOf` parent
                  then joinPath rest
                  else path
              _ -> path
       in case removeTmpDir <$> L.stripPrefix buildDir modulePath of
            -- File is in the build directory        
            Just path
              | takeExtension path == ".hs-boot" -> do
                let possiblePaths = path : map (</> path) srcDirs
                mbFoundPath <- findM doesFileExist possiblePaths
                case mbFoundPath of
                  Just p -> toHaskellModulePath p
                  _ -> return Nothing
              | takeExtension path == ".hs" -> do
                let paths =
                      map
                        (replaceExtension path)
                        HCE.haskellPreprocessorExtensions
                    possiblePaths =
                      paths ++
                      concatMap (\srcDir -> map (srcDir </>) paths) srcDirs
                mbFoundPath <- findM doesFileExist possiblePaths
                case mbFoundPath of
                  Just p -> toHaskellModulePath p
                  _ -> return Nothing
              | otherwise -> return Nothing
            Nothing -> toHaskellModulePath modulePath
    Nothing -> return Nothing

indexModule ::
     HCE.SourceCodePreprocessing
  -> HCE.ComponentId
  -> HCE.PackageId
  -> DynFlags
  -> ModuleDependencies
  -> (HCE.HaskellModulePath, ModSummary)
  -> GhcT (LoggingT IO) (Either SomeException ( HCE.ModuleInfo
                                              , ModuleDependencies))
indexModule sourceCodePreprocessing componentId currentPackageId flags deps (modulePath, modSum) =
  gtrySync $ do
    logDebugN (T.append "Indexing " $ HCE.getHaskellModulePath modulePath)
    parsedModule <- parseModule modSum
    typecheckedModule <- typecheckModule parsedModule
    hscEnv <- getSession
    externalPackageState <- liftIO . readIORef . hsc_EPS $ hscEnv
    originalSourceCode <-
      liftIO $
      T.replace "\t" "        " . TE.decodeUtf8 <$>
      BS.readFile (T.unpack . HCE.getHaskellModulePath $ modulePath)
    let (modInfo, (fileMap', exportMap', moduleNameMap'), typeErrors) =
          createModuleInfo
            deps
            ( flags
            , typecheckedModule
            , hsc_HPT hscEnv
            , externalPackageState
            , modSum)
            modulePath
            currentPackageId
            componentId
            (originalSourceCode, sourceCodePreprocessing)
    unless (null typeErrors) $
      logInfoN $ T.append "Type errors : " $ T.pack $ show typeErrors
    deepseq modInfo $ return (modInfo, (fileMap', exportMap', moduleNameMap'))