1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
12 defaultCleanupHandler,
15 Ghc, GhcT, GhcMonad(..),
16 runGhc, runGhcT, initGhcMonad,
17 gcatch, gbracket, gfinally,
18 clearWarnings, getWarnings, hasWarnings,
19 printExceptionAndWarnings, printWarnings,
22 -- * Flags and settings
23 DynFlags(..), DynFlag(..), Severity(..), HscTarget(..), dopt,
24 GhcMode(..), GhcLink(..), defaultObjectTarget,
31 Target(..), TargetId(..), Phase,
38 -- * Extending the program scope
41 extendGlobalTypeScope,
44 -- * Loading\/compiling the program
46 load, loadWithLogger, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
47 defaultWarnErrLogger, WarnErrLogger,
48 workingDirectoryChanged,
49 parseModule, typecheckModule, desugarModule, loadModule,
50 ParsedModule, TypecheckedModule, DesugaredModule, -- all abstract
51 TypecheckedSource, ParsedSource, RenamedSource, -- ditto
52 TypecheckedMod, ParsedMod,
53 moduleInfo, renamedSource, typecheckedSource,
54 parsedSource, coreModule,
55 compileToCoreModule, compileToCoreSimplified,
59 -- * Parsing Haddock comments
62 -- * Inspecting the module structure of the program
63 ModuleGraph, ModSummary(..), ms_mod_name, ModLocation(..),
68 -- * Inspecting modules
75 modInfoIsExportedName,
79 mkPrintUnqualifiedForModule,
81 -- * Querying the environment
85 PrintUnqualified, alwaysQualify,
87 -- * Interactive evaluation
88 getBindings, getPrintUnqual,
91 setContext, getContext,
101 runStmt, SingleStep(..),
103 Resume(resumeStmt, resumeThreadId, resumeBreakInfo, resumeSpan,
104 resumeHistory, resumeHistoryIx),
105 History(historyBreakInfo, historyEnclosingDecl),
106 GHC.getHistorySpan, getHistoryModule,
109 InteractiveEval.back,
110 InteractiveEval.forward,
113 InteractiveEval.compileExpr, HValue, dynCompileExpr,
115 GHC.obtainTermFromId, GHC.obtainTermFromVal, reconstructType,
117 ModBreaks(..), BreakIndex,
118 BreakInfo(breakInfo_number, breakInfo_module),
119 BreakArray, setBreakOn, setBreakOff, getBreak,
122 -- * Abstract syntax elements
128 Module, mkModule, pprModule, moduleName, modulePackageId,
129 ModuleName, mkModuleName, moduleNameString,
133 isExternalName, nameModule, pprParenSymName, nameSrcSpan,
135 RdrName(Qual,Unqual),
139 isImplicitId, isDeadBinder,
140 isExportedId, isLocalId, isGlobalId,
142 isPrimOpId, isFCallId, isClassOpId_maybe,
143 isDataConWorkId, idDataCon,
144 isBottomingId, isDictonaryId,
145 recordSelectorFieldLabel,
147 -- ** Type constructors
149 tyConTyVars, tyConDataCons, tyConArity,
150 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
152 synTyConDefn, synTyConType, synTyConResKind,
158 -- ** Data constructors
160 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
161 dataConIsInfix, isVanillaDataCon,
163 StrictnessMark(..), isMarkedStrict,
167 classMethods, classSCTheta, classTvsFds,
172 instanceDFunId, pprInstance, pprInstanceHdr,
174 -- ** Types and Kinds
175 Type, splitForAllTys, funResultTy,
176 pprParendType, pprTypeApp,
179 ThetaType, pprThetaArrow,
185 module HsSyn, -- ToDo: remove extraneous bits
189 defaultFixity, maxPrecedence,
193 -- ** Source locations
195 mkSrcLoc, isGoodSrcLoc, noSrcLoc,
196 srcLocFile, srcLocLine, srcLocCol,
198 mkSrcSpan, srcLocSpan, isGoodSrcSpan, noSrcSpan,
199 srcSpanStart, srcSpanEnd,
201 srcSpanStartLine, srcSpanEndLine,
202 srcSpanStartCol, srcSpanEndCol,
207 -- *** Constructing Located
208 noLoc, mkGeneralLocated,
210 -- *** Deconstructing Located
213 -- *** Combining and comparing Located values
214 eqLocated, cmpLocated, combineLocs, addCLoc,
215 leftmost_smallest, leftmost_largest, rightmost,
219 GhcException(..), showGhcException,
221 -- * Token stream manipulations
223 getTokenStream, getRichTokenStream,
224 showRichTokenStream, addSourceToTokens,
234 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
235 * what StaticFlags should we expose, if any?
238 #include "HsVersions.h"
241 import qualified Linker
242 import Linker ( HValue )
246 import InteractiveEval
251 import TcRnTypes hiding (LIE)
252 import TcRnMonad ( initIfaceCheck )
256 import qualified HsSyn -- hack as we want to reexport the whole module
257 import HsSyn hiding ((<.>))
258 import Type hiding (typeKind)
259 import TcType hiding (typeKind)
262 import TysPrim ( alphaTyVars )
267 import Name hiding ( varName )
268 import OccName ( parenSymOcc )
269 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr,
271 import FamInstEnv ( emptyFamInstEnv )
275 import DriverPipeline
276 import DriverPhases ( HscSource(..), Phase(..), isHaskellSrcFilename, startPhase )
282 import StaticFlagParser
283 import qualified StaticFlags
284 import SysTools ( initSysTools, cleanTempFiles, cleanTempFilesExcept,
289 import qualified UniqFM as UFM
295 import Bag ( unitBag, listToBag, emptyBag, isEmptyBag )
299 import StringBuffer ( StringBuffer, hGetStringBuffer, nextChar )
302 import Maybes ( expectJust, mapCatMaybes )
304 import HaddockLex ( tokenise )
308 import Control.Concurrent
309 import System.Directory ( getModificationTime, doesFileExist,
310 getCurrentDirectory )
313 import qualified Data.List as List
314 import Data.Typeable ( Typeable )
315 import Data.Word ( Word8 )
317 import System.Exit ( exitWith, ExitCode(..) )
318 import System.Time ( ClockTime, getClockTime )
321 import System.FilePath
323 import System.IO.Error ( try, isDoesNotExistError )
324 import Prelude hiding (init)
327 -- -----------------------------------------------------------------------------
328 -- Exception handlers
330 -- | Install some default exception handlers and run the inner computation.
331 -- Unless you want to handle exceptions yourself, you should wrap this around
332 -- the top level of your program. The default handlers output the error
333 -- message(s) to stderr and exit cleanly.
334 defaultErrorHandler :: (ExceptionMonad m, MonadIO m) => DynFlags -> m a -> m a
335 defaultErrorHandler dflags inner =
336 -- top-level exception handler: any unrecognised exception is a compiler bug.
337 ghandle (\exception -> liftIO $ do
339 case fromException exception of
340 -- an IO exception probably isn't our fault, so don't panic
341 Just (ioe :: IOException) ->
342 fatalErrorMsg dflags (text (show ioe))
343 _ -> case fromException exception of
344 Just StackOverflow ->
345 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
346 _ -> case fromException exception of
347 Just (ex :: ExitCode) -> throw ex
350 (text (show (Panic (show exception))))
351 exitWith (ExitFailure 1)
354 -- error messages propagated as exceptions
359 PhaseFailed _ code -> exitWith code
360 Interrupted -> exitWith (ExitFailure 1)
361 _ -> do fatalErrorMsg dflags (text (show ge))
362 exitWith (ExitFailure 1)
366 -- | Install a default cleanup handler to remove temporary files deposited by
367 -- a GHC run. This is seperate from 'defaultErrorHandler', because you might
368 -- want to override the error handling, but still get the ordinary cleanup
370 defaultCleanupHandler :: (ExceptionMonad m, MonadIO m) =>
371 DynFlags -> m a -> m a
372 defaultCleanupHandler dflags inner =
373 -- make sure we clean up after ourselves
376 cleanTempFiles dflags
379 -- exceptions will be blocked while we clean the temporary files,
380 -- so there shouldn't be any difficulty if we receive further
383 -- | Print the error message and all warnings. Useful inside exception
384 -- handlers. Clears warnings after printing.
385 printExceptionAndWarnings :: GhcMonad m => SourceError -> m ()
386 printExceptionAndWarnings err = do
387 let errs = srcErrorMessages err
389 dflags <- getSessionDynFlags
391 -- Empty errors means we failed due to -Werror. (Since this function
392 -- takes a source error as argument, we know for sure _some_ error
393 -- did indeed happen.)
395 printBagOfWarnings dflags warns
396 printBagOfErrors dflags (unitBag warnIsErrorMsg)
397 else liftIO $ printBagOfErrors dflags errs
400 -- | Print all accumulated warnings using 'log_action'.
401 printWarnings :: GhcMonad m => m ()
403 dflags <- getSessionDynFlags
405 liftIO $ printBagOfWarnings dflags warns
408 -- | Run function for the 'Ghc' monad.
410 -- It initialises the GHC session and warnings via 'initGhcMonad'. Each call
411 -- to this function will create a new session which should not be shared among
414 -- Any errors not handled inside the 'Ghc' action are propagated as IO
417 runGhc :: Maybe FilePath -- ^ See argument to 'initGhcMonad'.
418 -> Ghc a -- ^ The action to perform.
420 runGhc mb_top_dir ghc = do
421 wref <- newIORef emptyBag
422 ref <- newIORef undefined
423 let session = Session ref wref
424 flip unGhc session $ do
425 initGhcMonad mb_top_dir
427 -- XXX: unregister interrupt handlers here?
429 -- | Run function for 'GhcT' monad transformer.
431 -- It initialises the GHC session and warnings via 'initGhcMonad'. Each call
432 -- to this function will create a new session which should not be shared among
435 runGhcT :: (ExceptionMonad m, Functor m, MonadIO m) =>
436 Maybe FilePath -- ^ See argument to 'initGhcMonad'.
437 -> GhcT m a -- ^ The action to perform.
439 runGhcT mb_top_dir ghct = do
440 wref <- liftIO $ newIORef emptyBag
441 ref <- liftIO $ newIORef undefined
442 let session = Session ref wref
443 flip unGhcT session $ do
444 initGhcMonad mb_top_dir
447 -- | Initialise a GHC session.
449 -- If you implement a custom 'GhcMonad' you must call this function in the
450 -- monad run function. It will initialise the session variable and clear all
453 -- The first argument should point to the directory where GHC's library files
454 -- reside. More precisely, this should be the output of @ghc --print-libdir@
455 -- of the version of GHC the module using this API is compiled with. For
456 -- portability, you should use the @ghc-paths@ package, available at
457 -- <http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ghc-paths>.
459 initGhcMonad :: GhcMonad m => Maybe FilePath -> m ()
460 initGhcMonad mb_top_dir = do
462 main_thread <- liftIO $ myThreadId
463 liftIO $ modifyMVar_ interruptTargetThread (return . (main_thread :))
464 liftIO $ installSignalHandlers
466 liftIO $ StaticFlags.initStaticOpts
468 dflags0 <- liftIO $ initDynFlags defaultDynFlags
469 dflags <- liftIO $ initSysTools mb_top_dir dflags0
470 env <- liftIO $ newHscEnv dflags
474 -- -----------------------------------------------------------------------------
477 -- | Grabs the DynFlags from the Session
478 getSessionDynFlags :: GhcMonad m => m DynFlags
479 getSessionDynFlags = withSession (return . hsc_dflags)
481 -- | Updates the DynFlags in a Session. This also reads
482 -- the package database (unless it has already been read),
483 -- and prepares the compilers knowledge about packages. It
484 -- can be called again to load new packages: just add new
485 -- package flags to (packageFlags dflags).
487 -- Returns a list of new packages that may need to be linked in using
488 -- the dynamic linker (see 'linkPackages') as a result of new package
489 -- flags. If you are not doing linking or doing static linking, you
490 -- can ignore the list of packages returned.
492 setSessionDynFlags :: GhcMonad m => DynFlags -> m [PackageId]
493 setSessionDynFlags dflags = do
494 (dflags', preload) <- liftIO $ initPackages dflags
495 modifySession (\h -> h{ hsc_dflags = dflags' })
498 -- | If there is no -o option, guess the name of target executable
499 -- by using top-level source file name as a base.
500 guessOutputFile :: GhcMonad m => m ()
501 guessOutputFile = modifySession $ \env ->
502 let dflags = hsc_dflags env
503 mod_graph = hsc_mod_graph env
504 mainModuleSrcPath :: Maybe String
505 mainModuleSrcPath = do
506 let isMain = (== mainModIs dflags) . ms_mod
507 [ms] <- return (filter isMain mod_graph)
508 ml_hs_file (ms_location ms)
509 name = fmap dropExtension mainModuleSrcPath
511 #if defined(mingw32_HOST_OS)
512 -- we must add the .exe extention unconditionally here, otherwise
513 -- when name has an extension of its own, the .exe extension will
514 -- not be added by DriverPipeline.exeFileName. See #2248
515 name_exe = fmap (<.> "exe") name
520 case outputFile dflags of
522 Nothing -> env { hsc_dflags = dflags { outputFile = name_exe } }
524 -- -----------------------------------------------------------------------------
527 -- ToDo: think about relative vs. absolute file paths. And what
528 -- happens when the current directory changes.
530 -- | Sets the targets for this session. Each target may be a module name
531 -- or a filename. The targets correspond to the set of root modules for
532 -- the program\/library. Unloading the current program is achieved by
533 -- setting the current set of targets to be empty, followed by 'load'.
534 setTargets :: GhcMonad m => [Target] -> m ()
535 setTargets targets = modifySession (\h -> h{ hsc_targets = targets })
537 -- | Returns the current set of targets
538 getTargets :: GhcMonad m => m [Target]
539 getTargets = withSession (return . hsc_targets)
541 -- | Add another target.
542 addTarget :: GhcMonad m => Target -> m ()
544 = modifySession (\h -> h{ hsc_targets = target : hsc_targets h })
547 removeTarget :: GhcMonad m => TargetId -> m ()
548 removeTarget target_id
549 = modifySession (\h -> h{ hsc_targets = filter (hsc_targets h) })
551 filter targets = [ t | t@(Target id _ _) <- targets, id /= target_id ]
553 -- | Attempts to guess what Target a string refers to. This function
554 -- implements the @--make@/GHCi command-line syntax for filenames:
556 -- - if the string looks like a Haskell source filename, then interpret it
559 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
562 -- - otherwise interpret the string as a module name
564 guessTarget :: GhcMonad m => String -> Maybe Phase -> m Target
565 guessTarget str (Just phase)
566 = return (Target (TargetFile str (Just phase)) True Nothing)
567 guessTarget str Nothing
568 | isHaskellSrcFilename file
569 = return (target (TargetFile file Nothing))
571 = do exists <- liftIO $ doesFileExist hs_file
573 then return (target (TargetFile hs_file Nothing))
575 exists <- liftIO $ doesFileExist lhs_file
577 then return (target (TargetFile lhs_file Nothing))
579 if looksLikeModuleName file
580 then return (target (TargetModule (mkModuleName file)))
583 (ProgramError (showSDoc $
584 text "target" <+> quotes (text file) <+>
585 text "is not a module name or a source file"))
588 | '*':rest <- str = (rest, False)
589 | otherwise = (str, True)
591 hs_file = file <.> "hs"
592 lhs_file = file <.> "lhs"
594 target tid = Target tid obj_allowed Nothing
596 -- -----------------------------------------------------------------------------
597 -- Extending the program scope
599 extendGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
600 extendGlobalRdrScope rdrElts
601 = modifySession $ \hscEnv ->
602 let global_rdr = hsc_global_rdr_env hscEnv
603 in hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv global_rdr rdrElts }
605 setGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
606 setGlobalRdrScope rdrElts
607 = modifySession $ \hscEnv ->
608 hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv emptyGlobalRdrEnv rdrElts }
610 extendGlobalTypeScope :: GhcMonad m => [Id] -> m ()
611 extendGlobalTypeScope ids
612 = modifySession $ \hscEnv ->
613 let global_type = hsc_global_type_env hscEnv
614 in hscEnv{ hsc_global_type_env = extendTypeEnvWithIds global_type ids }
616 setGlobalTypeScope :: GhcMonad m => [Id] -> m ()
617 setGlobalTypeScope ids
618 = modifySession $ \hscEnv ->
619 hscEnv{ hsc_global_type_env = extendTypeEnvWithIds emptyTypeEnv ids }
621 -- -----------------------------------------------------------------------------
622 -- Parsing Haddock comments
624 parseHaddockComment :: String -> Either String (HsDoc RdrName)
625 parseHaddockComment string =
626 case parseHaddockParagraphs (tokenise string) of
630 -- -----------------------------------------------------------------------------
631 -- Loading the program
633 -- | Perform a dependency analysis starting from the current targets
634 -- and update the session with the new module graph.
635 depanal :: GhcMonad m =>
636 [ModuleName] -- ^ excluded modules
637 -> Bool -- ^ allow duplicate roots
639 depanal excluded_mods allow_dup_roots = do
640 hsc_env <- getSession
642 dflags = hsc_dflags hsc_env
643 targets = hsc_targets hsc_env
644 old_graph = hsc_mod_graph hsc_env
646 liftIO $ showPass dflags "Chasing dependencies"
647 liftIO $ debugTraceMsg dflags 2 (hcat [
648 text "Chasing modules from: ",
649 hcat (punctuate comma (map pprTarget targets))])
651 mod_graph <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
652 modifySession $ \_ -> hsc_env { hsc_mod_graph = mod_graph }
657 | LoadUpTo ModuleName
658 | LoadDependenciesOf ModuleName
660 -- | Try to load the program. Calls 'loadWithLogger' with the default
661 -- compiler that just immediately logs all warnings and errors.
662 load :: GhcMonad m => LoadHowMuch -> m SuccessFlag
664 loadWithLogger defaultWarnErrLogger how_much
666 -- | A function called to log warnings and errors.
667 type WarnErrLogger = GhcMonad m => Maybe SourceError -> m ()
669 defaultWarnErrLogger :: WarnErrLogger
670 defaultWarnErrLogger Nothing = printWarnings
671 defaultWarnErrLogger (Just e) = printExceptionAndWarnings e
673 -- | Try to load the program. If a Module is supplied, then just
674 -- attempt to load up to this target. If no Module is supplied,
675 -- then try to load all targets.
677 -- The first argument is a function that is called after compiling each
678 -- module to print wanrings and errors.
680 loadWithLogger :: GhcMonad m => WarnErrLogger -> LoadHowMuch -> m SuccessFlag
681 loadWithLogger logger how_much = do
682 -- Dependency analysis first. Note that this fixes the module graph:
683 -- even if we don't get a fully successful upsweep, the full module
684 -- graph is still retained in the Session. We can tell which modules
685 -- were successfully loaded by inspecting the Session's HPT.
686 mod_graph <- depanal [] False
687 load2 how_much mod_graph logger
689 load2 :: GhcMonad m => LoadHowMuch -> [ModSummary] -> WarnErrLogger
691 load2 how_much mod_graph logger = do
693 hsc_env <- getSession
695 let hpt1 = hsc_HPT hsc_env
696 let dflags = hsc_dflags hsc_env
698 -- The "bad" boot modules are the ones for which we have
699 -- B.hs-boot in the module graph, but no B.hs
700 -- The downsweep should have ensured this does not happen
702 let all_home_mods = [ms_mod_name s
703 | s <- mod_graph, not (isBootSummary s)]
704 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
705 not (ms_mod_name s `elem` all_home_mods)]
706 ASSERT( null bad_boot_mods ) return ()
708 -- check that the module given in HowMuch actually exists, otherwise
709 -- topSortModuleGraph will bomb later.
710 let checkHowMuch (LoadUpTo m) = checkMod m
711 checkHowMuch (LoadDependenciesOf m) = checkMod m
715 | m `elem` all_home_mods = and_then
717 liftIO $ errorMsg dflags (text "no such module:" <+>
721 checkHowMuch how_much $ do
723 -- mg2_with_srcimps drops the hi-boot nodes, returning a
724 -- graph with cycles. Among other things, it is used for
725 -- backing out partially complete cycles following a failed
726 -- upsweep, and for removing from hpt all the modules
727 -- not in strict downwards closure, during calls to compile.
728 let mg2_with_srcimps :: [SCC ModSummary]
729 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
731 -- If we can determine that any of the {-# SOURCE #-} imports
732 -- are definitely unnecessary, then emit a warning.
733 warnUnnecessarySourceImports dflags mg2_with_srcimps
736 -- check the stability property for each module.
737 stable_mods@(stable_obj,stable_bco)
738 = checkStability hpt1 mg2_with_srcimps all_home_mods
740 -- prune bits of the HPT which are definitely redundant now,
742 pruned_hpt = pruneHomePackageTable hpt1
743 (flattenSCCs mg2_with_srcimps)
746 liftIO $ evaluate pruned_hpt
748 -- before we unload anything, make sure we don't leave an old
749 -- interactive context around pointing to dead bindings. Also,
750 -- write the pruned HPT to allow the old HPT to be GC'd.
751 modifySession $ \_ -> hsc_env{ hsc_IC = emptyInteractiveContext,
752 hsc_HPT = pruned_hpt }
754 liftIO $ debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
755 text "Stable BCO:" <+> ppr stable_bco)
757 -- Unload any modules which are going to be re-linked this time around.
758 let stable_linkables = [ linkable
759 | m <- stable_obj++stable_bco,
760 Just hmi <- [lookupUFM pruned_hpt m],
761 Just linkable <- [hm_linkable hmi] ]
762 liftIO $ unload hsc_env stable_linkables
764 -- We could at this point detect cycles which aren't broken by
765 -- a source-import, and complain immediately, but it seems better
766 -- to let upsweep_mods do this, so at least some useful work gets
767 -- done before the upsweep is abandoned.
768 --hPutStrLn stderr "after tsort:\n"
769 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
771 -- Now do the upsweep, calling compile for each module in
772 -- turn. Final result is version 3 of everything.
774 -- Topologically sort the module graph, this time including hi-boot
775 -- nodes, and possibly just including the portion of the graph
776 -- reachable from the module specified in the 2nd argument to load.
777 -- This graph should be cycle-free.
778 -- If we're restricting the upsweep to a portion of the graph, we
779 -- also want to retain everything that is still stable.
780 let full_mg :: [SCC ModSummary]
781 full_mg = topSortModuleGraph False mod_graph Nothing
783 maybe_top_mod = case how_much of
785 LoadDependenciesOf m -> Just m
788 partial_mg0 :: [SCC ModSummary]
789 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
791 -- LoadDependenciesOf m: we want the upsweep to stop just
792 -- short of the specified module (unless the specified module
795 | LoadDependenciesOf _mod <- how_much
796 = ASSERT( case last partial_mg0 of
797 AcyclicSCC ms -> ms_mod_name ms == _mod; _ -> False )
798 List.init partial_mg0
804 | AcyclicSCC ms <- full_mg,
805 ms_mod_name ms `elem` stable_obj++stable_bco,
806 ms_mod_name ms `notElem` [ ms_mod_name ms' |
807 AcyclicSCC ms' <- partial_mg ] ]
809 mg = stable_mg ++ partial_mg
811 -- clean up between compilations
812 let cleanup = cleanTempFilesExcept dflags
813 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
815 liftIO $ debugTraceMsg dflags 2 (hang (text "Ready for upsweep")
817 (upsweep_ok, hsc_env1, modsUpswept)
819 (hsc_env { hsc_HPT = emptyHomePackageTable })
820 pruned_hpt stable_mods cleanup mg
822 -- Make modsDone be the summaries for each home module now
823 -- available; this should equal the domain of hpt3.
824 -- Get in in a roughly top .. bottom order (hence reverse).
826 let modsDone = reverse modsUpswept
828 -- Try and do linking in some form, depending on whether the
829 -- upsweep was completely or only partially successful.
831 if succeeded upsweep_ok
834 -- Easy; just relink it all.
835 do liftIO $ debugTraceMsg dflags 2 (text "Upsweep completely successful.")
837 -- Clean up after ourselves
838 liftIO $ cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
840 -- Issue a warning for the confusing case where the user
841 -- said '-o foo' but we're not going to do any linking.
842 -- We attempt linking if either (a) one of the modules is
843 -- called Main, or (b) the user said -no-hs-main, indicating
844 -- that main() is going to come from somewhere else.
846 let ofile = outputFile dflags
847 let no_hs_main = dopt Opt_NoHsMain dflags
849 main_mod = mainModIs dflags
850 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
851 do_linking = a_root_is_Main || no_hs_main
853 when (ghcLink dflags == LinkBinary
854 && isJust ofile && not do_linking) $
855 liftIO $ debugTraceMsg dflags 1 $
856 text ("Warning: output was redirected with -o, " ++
857 "but no output will be generated\n" ++
858 "because there is no " ++
859 moduleNameString (moduleName main_mod) ++ " module.")
861 -- link everything together
862 linkresult <- liftIO $ link (ghcLink dflags) dflags do_linking (hsc_HPT hsc_env1)
864 loadFinish Succeeded linkresult hsc_env1
867 -- Tricky. We need to back out the effects of compiling any
868 -- half-done cycles, both so as to clean up the top level envs
869 -- and to avoid telling the interactive linker to link them.
870 do liftIO $ debugTraceMsg dflags 2 (text "Upsweep partially successful.")
873 = map ms_mod modsDone
874 let mods_to_zap_names
875 = findPartiallyCompletedCycles modsDone_names
878 = filter ((`notElem` mods_to_zap_names).ms_mod)
881 let hpt4 = retainInTopLevelEnvs (map ms_mod_name mods_to_keep)
884 -- Clean up after ourselves
885 liftIO $ cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
887 -- there should be no Nothings where linkables should be, now
888 ASSERT(all (isJust.hm_linkable)
889 (eltsUFM (hsc_HPT hsc_env))) do
891 -- Link everything together
892 linkresult <- liftIO $ link (ghcLink dflags) dflags False hpt4
894 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
895 loadFinish Failed linkresult hsc_env4
897 -- Finish up after a load.
899 -- If the link failed, unload everything and return.
900 loadFinish :: GhcMonad m =>
901 SuccessFlag -> SuccessFlag -> HscEnv
903 loadFinish _all_ok Failed hsc_env
904 = do liftIO $ unload hsc_env []
905 modifySession $ \_ -> discardProg hsc_env
908 -- Empty the interactive context and set the module context to the topmost
909 -- newly loaded module, or the Prelude if none were loaded.
910 loadFinish all_ok Succeeded hsc_env
911 = do modifySession $ \_ -> hsc_env{ hsc_IC = emptyInteractiveContext }
915 -- Forget the current program, but retain the persistent info in HscEnv
916 discardProg :: HscEnv -> HscEnv
918 = hsc_env { hsc_mod_graph = emptyMG,
919 hsc_IC = emptyInteractiveContext,
920 hsc_HPT = emptyHomePackageTable }
922 -- used to fish out the preprocess output files for the purposes of
923 -- cleaning up. The preprocessed file *might* be the same as the
924 -- source file, but that doesn't do any harm.
925 ppFilesFromSummaries :: [ModSummary] -> [FilePath]
926 ppFilesFromSummaries summaries = map ms_hspp_file summaries
928 -- -----------------------------------------------------------------------------
930 class ParsedMod m where
931 modSummary :: m -> ModSummary
932 parsedSource :: m -> ParsedSource
934 class ParsedMod m => TypecheckedMod m where
935 renamedSource :: m -> Maybe RenamedSource
936 typecheckedSource :: m -> TypecheckedSource
937 moduleInfo :: m -> ModuleInfo
938 tm_internals :: m -> (TcGblEnv, ModDetails)
939 -- ToDo: improvements that could be made here:
940 -- if the module succeeded renaming but not typechecking,
941 -- we can still get back the GlobalRdrEnv and exports, so
942 -- perhaps the ModuleInfo should be split up into separate
945 class TypecheckedMod m => DesugaredMod m where
946 coreModule :: m -> ModGuts
948 -- | The result of successful parsing.
950 ParsedModule { pm_mod_summary :: ModSummary
951 , pm_parsed_source :: ParsedSource }
953 instance ParsedMod ParsedModule where
954 modSummary m = pm_mod_summary m
955 parsedSource m = pm_parsed_source m
957 -- | The result of successful typechecking. It also contains the parser
959 data TypecheckedModule =
960 TypecheckedModule { tm_parsed_module :: ParsedModule
961 , tm_renamed_source :: Maybe RenamedSource
962 , tm_typechecked_source :: TypecheckedSource
963 , tm_checked_module_info :: ModuleInfo
964 , tm_internals_ :: (TcGblEnv, ModDetails)
967 instance ParsedMod TypecheckedModule where
968 modSummary m = modSummary (tm_parsed_module m)
969 parsedSource m = parsedSource (tm_parsed_module m)
971 instance TypecheckedMod TypecheckedModule where
972 renamedSource m = tm_renamed_source m
973 typecheckedSource m = tm_typechecked_source m
974 moduleInfo m = tm_checked_module_info m
975 tm_internals m = tm_internals_ m
977 -- | The result of successful desugaring (i.e., translation to core). Also
978 -- contains all the information of a typechecked module.
979 data DesugaredModule =
980 DesugaredModule { dm_typechecked_module :: TypecheckedModule
981 , dm_core_module :: ModGuts
984 instance ParsedMod DesugaredModule where
985 modSummary m = modSummary (dm_typechecked_module m)
986 parsedSource m = parsedSource (dm_typechecked_module m)
988 instance TypecheckedMod DesugaredModule where
989 renamedSource m = renamedSource (dm_typechecked_module m)
990 typecheckedSource m = typecheckedSource (dm_typechecked_module m)
991 moduleInfo m = moduleInfo (dm_typechecked_module m)
992 tm_internals m = tm_internals_ (dm_typechecked_module m)
994 instance DesugaredMod DesugaredModule where
995 coreModule m = dm_core_module m
997 type ParsedSource = Located (HsModule RdrName)
998 type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
999 Maybe (HsDoc Name), HaddockModInfo Name)
1000 type TypecheckedSource = LHsBinds Id
1003 -- - things that aren't in the output of the typechecker right now:
1004 -- - the export list
1006 -- - type signatures
1007 -- - type/data/newtype declarations
1008 -- - class declarations
1010 -- - extra things in the typechecker's output:
1011 -- - default methods are turned into top-level decls.
1012 -- - dictionary bindings
1014 -- | Return the 'ModSummary' of a module with the given name.
1016 -- The module must be part of the module graph (see 'hsc_mod_graph' and
1017 -- 'ModuleGraph'). If this is not the case, this function will throw a
1020 -- This function ignores boot modules and requires that there is only one
1021 -- non-boot module with the given name.
1022 getModSummary :: GhcMonad m => ModuleName -> m ModSummary
1023 getModSummary mod = do
1024 mg <- liftM hsc_mod_graph getSession
1025 case [ ms | ms <- mg, ms_mod_name ms == mod, not (isBootSummary ms) ] of
1026 [] -> throw $ mkApiErr (text "Module not part of module graph")
1028 multiple -> throw $ mkApiErr (text "getModSummary is ambiguous: " <+> ppr multiple)
1030 -- | Parse a module.
1032 -- Throws a 'SourceError' on parse error.
1033 parseModule :: GhcMonad m => ModSummary -> m ParsedModule
1035 hsc_env0 <- getSession
1036 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1037 rdr_module <- parseFile hsc_env ms
1038 return (ParsedModule ms rdr_module)
1040 -- | Typecheck and rename a parsed module.
1042 -- Throws a 'SourceError' if either fails.
1043 typecheckModule :: GhcMonad m => ParsedModule -> m TypecheckedModule
1044 typecheckModule pmod = do
1045 let ms = modSummary pmod
1046 hsc_env0 <- getSession
1047 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1048 (tc_gbl_env, rn_info)
1049 <- typecheckRenameModule hsc_env ms (parsedSource pmod)
1050 details <- liftIO $ makeSimpleDetails hsc_env tc_gbl_env
1053 tm_internals_ = (tc_gbl_env, details),
1054 tm_parsed_module = pmod,
1055 tm_renamed_source = rn_info,
1056 tm_typechecked_source = tcg_binds tc_gbl_env,
1057 tm_checked_module_info =
1059 minf_type_env = md_types details,
1060 minf_exports = availsToNameSet $ md_exports details,
1061 minf_rdr_env = Just (tcg_rdr_env tc_gbl_env),
1062 minf_instances = md_insts details
1064 ,minf_modBreaks = emptyModBreaks
1068 -- | Desugar a typechecked module.
1069 desugarModule :: GhcMonad m => TypecheckedModule -> m DesugaredModule
1070 desugarModule tcm = do
1071 let ms = modSummary tcm
1072 hsc_env0 <- getSession
1073 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1074 let (tcg, _) = tm_internals tcm
1075 guts <- deSugarModule hsc_env ms tcg
1078 dm_typechecked_module = tcm,
1079 dm_core_module = guts
1082 -- | Load a module. Input doesn't need to be desugared.
1084 -- XXX: Describe usage.
1085 loadModule :: (TypecheckedMod mod, GhcMonad m) => mod -> m mod
1087 let ms = modSummary tcm
1088 let mod = ms_mod_name ms
1089 hsc_env0 <- getSession
1090 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1091 let (tcg, details) = tm_internals tcm
1092 (iface,_) <- liftIO $ makeSimpleIface hsc_env Nothing tcg details
1093 let mod_info = HomeModInfo {
1095 hm_details = details,
1096 hm_linkable = Nothing }
1097 let hpt_new = addToUFM (hsc_HPT hsc_env) mod mod_info
1098 modifySession $ \_ -> hsc_env0{ hsc_HPT = hpt_new }
1101 -- | This is the way to get access to the Core bindings corresponding
1102 -- to a module. 'compileToCore' parses, typechecks, and
1103 -- desugars the module, then returns the resulting Core module (consisting of
1104 -- the module name, type declarations, and function declarations) if
1106 compileToCoreModule :: GhcMonad m => FilePath -> m CoreModule
1107 compileToCoreModule = compileCore False
1109 -- | Like compileToCoreModule, but invokes the simplifier, so
1110 -- as to return simplified and tidied Core.
1111 compileToCoreSimplified :: GhcMonad m => FilePath -> m CoreModule
1112 compileToCoreSimplified = compileCore True
1114 -- | Provided for backwards-compatibility: compileToCore returns just the Core
1115 -- bindings, but for most purposes, you probably want to call
1116 -- compileToCoreModule.
1117 compileToCore :: GhcMonad m => FilePath -> m [CoreBind]
1118 compileToCore fn = do
1119 mod <- compileToCoreModule session fn
1120 return $ cm_binds mod
1122 -- | Takes a CoreModule and compiles the bindings therein
1123 -- to object code. The first argument is a bool flag indicating
1124 -- whether to run the simplifier.
1125 -- The resulting .o, .hi, and executable files, if any, are stored in the
1126 -- current directory, and named according to the module name.
1127 -- Returns True iff compilation succeeded.
1128 -- This has only so far been tested with a single self-contained module.
1129 compileCoreToObj :: GhcMonad m => Bool -> CoreModule -> m ()
1130 compileCoreToObj simplify cm@(CoreModule{ cm_module = mName }) = do
1131 hscEnv <- getSession
1132 dflags <- getSessionDynFlags
1133 currentTime <- liftIO $ getClockTime
1134 cwd <- liftIO $ getCurrentDirectory
1135 modLocation <- liftIO $ mkHiOnlyModLocation dflags (hiSuf dflags) cwd
1136 ((moduleNameSlashes . moduleName) mName)
1138 let modSummary = ModSummary { ms_mod = mName,
1139 ms_hsc_src = ExtCoreFile,
1140 ms_location = modLocation,
1141 -- By setting the object file timestamp to Nothing,
1142 -- we always force recompilation, which is what we
1143 -- want. (Thus it doesn't matter what the timestamp
1144 -- for the (nonexistent) source file is.)
1145 ms_hs_date = currentTime,
1146 ms_obj_date = Nothing,
1147 -- Only handling the single-module case for now, so no imports.
1152 ms_hspp_opts = dflags,
1153 ms_hspp_buf = Nothing
1156 ioMsgMaybe $ flip evalComp (CompState{ compHscEnv=hscEnv,
1157 compModSummary=modSummary,
1158 compOldIface=Nothing}) $
1159 let maybe_simplify mod_guts | simplify = hscSimplify mod_guts
1160 | otherwise = return mod_guts
1161 in maybe_simplify (mkModGuts cm)
1167 -- Makes a "vanilla" ModGuts.
1168 mkModGuts :: CoreModule -> ModGuts
1169 mkModGuts coreModule = ModGuts {
1170 mg_module = cm_module coreModule,
1173 mg_deps = noDependencies,
1174 mg_dir_imps = emptyModuleEnv,
1175 mg_used_names = emptyNameSet,
1176 mg_rdr_env = emptyGlobalRdrEnv,
1177 mg_fix_env = emptyFixityEnv,
1178 mg_types = emptyTypeEnv,
1182 mg_binds = cm_binds coreModule,
1183 mg_foreign = NoStubs,
1184 mg_warns = NoWarnings,
1186 mg_hpc_info = emptyHpcInfo False,
1187 mg_modBreaks = emptyModBreaks,
1188 mg_vect_info = noVectInfo,
1189 mg_inst_env = emptyInstEnv,
1190 mg_fam_inst_env = emptyFamInstEnv
1193 compileCore :: GhcMonad m => Bool -> FilePath -> m CoreModule
1194 compileCore simplify fn = do
1195 -- First, set the target to the desired filename
1196 target <- guessTarget fn Nothing
1199 -- Then find dependencies
1200 modGraph <- depanal [] True
1201 case find ((== fn) . msHsFilePath) modGraph of
1202 Just modSummary -> do
1203 -- Now we have the module name;
1204 -- parse, typecheck and desugar the module
1205 mod_guts <- coreModule `fmap`
1206 (desugarModule =<< typecheckModule =<< parseModule modSummary)
1207 liftM gutsToCoreModule $
1210 -- If simplify is true: simplify (hscSimplify), then tidy
1212 hsc_env <- getSession
1213 simpl_guts <- ioMsg $ evalComp (hscSimplify mod_guts)
1215 compHscEnv = hsc_env,
1216 compModSummary = modSummary,
1217 compOldIface = Nothing})
1218 tidy_guts <- liftIO $ tidyProgram hsc_env simpl_guts
1219 return $ Left tidy_guts
1221 return $ Right mod_guts
1223 Nothing -> panic "compileToCoreModule: target FilePath not found in\
1224 module dependency graph"
1225 where -- two versions, based on whether we simplify (thus run tidyProgram,
1226 -- which returns a (CgGuts, ModDetails) pair, or not (in which case
1227 -- we just have a ModGuts.
1228 gutsToCoreModule :: Either (CgGuts, ModDetails) ModGuts -> CoreModule
1229 gutsToCoreModule (Left (cg, md)) = CoreModule {
1230 cm_module = cg_module cg, cm_types = md_types md,
1231 cm_imports = cg_dir_imps cg, cm_binds = cg_binds cg
1233 gutsToCoreModule (Right mg) = CoreModule {
1234 cm_module = mg_module mg, cm_types = mg_types mg,
1235 cm_imports = moduleEnvKeys (mg_dir_imps mg), cm_binds = mg_binds mg
1238 -- ---------------------------------------------------------------------------
1241 unload :: HscEnv -> [Linkable] -> IO ()
1242 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
1243 = case ghcLink (hsc_dflags hsc_env) of
1245 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
1247 LinkInMemory -> panic "unload: no interpreter"
1248 -- urgh. avoid warnings:
1249 hsc_env stable_linkables
1253 -- -----------------------------------------------------------------------------
1257 Stability tells us which modules definitely do not need to be recompiled.
1258 There are two main reasons for having stability:
1260 - avoid doing a complete upsweep of the module graph in GHCi when
1261 modules near the bottom of the tree have not changed.
1263 - to tell GHCi when it can load object code: we can only load object code
1264 for a module when we also load object code fo all of the imports of the
1265 module. So we need to know that we will definitely not be recompiling
1266 any of these modules, and we can use the object code.
1268 The stability check is as follows. Both stableObject and
1269 stableBCO are used during the upsweep phase later.
1272 stable m = stableObject m || stableBCO m
1275 all stableObject (imports m)
1276 && old linkable does not exist, or is == on-disk .o
1277 && date(on-disk .o) > date(.hs)
1280 all stable (imports m)
1281 && date(BCO) > date(.hs)
1284 These properties embody the following ideas:
1286 - if a module is stable, then:
1288 - if it has been compiled in a previous pass (present in HPT)
1289 then it does not need to be compiled or re-linked.
1291 - if it has not been compiled in a previous pass,
1292 then we only need to read its .hi file from disk and
1293 link it to produce a 'ModDetails'.
1295 - if a modules is not stable, we will definitely be at least
1296 re-linking, and possibly re-compiling it during the 'upsweep'.
1297 All non-stable modules can (and should) therefore be unlinked
1298 before the 'upsweep'.
1300 - Note that objects are only considered stable if they only depend
1301 on other objects. We can't link object code against byte code.
1305 :: HomePackageTable -- HPT from last compilation
1306 -> [SCC ModSummary] -- current module graph (cyclic)
1307 -> [ModuleName] -- all home modules
1308 -> ([ModuleName], -- stableObject
1309 [ModuleName]) -- stableBCO
1311 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
1313 checkSCC (stable_obj, stable_bco) scc0
1314 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
1315 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
1316 | otherwise = (stable_obj, stable_bco)
1318 scc = flattenSCC scc0
1319 scc_mods = map ms_mod_name scc
1320 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
1322 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
1323 -- all imports outside the current SCC, but in the home pkg
1325 stable_obj_imps = map (`elem` stable_obj) scc_allimps
1326 stable_bco_imps = map (`elem` stable_bco) scc_allimps
1330 && all object_ok scc
1333 and (zipWith (||) stable_obj_imps stable_bco_imps)
1337 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
1341 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
1342 Just hmi | Just l <- hm_linkable hmi
1343 -> isObjectLinkable l && t == linkableTime l
1345 -- why '>=' rather than '>' above? If the filesystem stores
1346 -- times to the nearset second, we may occasionally find that
1347 -- the object & source have the same modification time,
1348 -- especially if the source was automatically generated
1349 -- and compiled. Using >= is slightly unsafe, but it matches
1350 -- make's behaviour.
1353 = case lookupUFM hpt (ms_mod_name ms) of
1354 Just hmi | Just l <- hm_linkable hmi ->
1355 not (isObjectLinkable l) &&
1356 linkableTime l >= ms_hs_date ms
1359 ms_allimps :: ModSummary -> [ModuleName]
1360 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
1362 -- -----------------------------------------------------------------------------
1364 -- | Prune the HomePackageTable
1366 -- Before doing an upsweep, we can throw away:
1368 -- - For non-stable modules:
1369 -- - all ModDetails, all linked code
1370 -- - all unlinked code that is out of date with respect to
1373 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
1374 -- space at the end of the upsweep, because the topmost ModDetails of the
1375 -- old HPT holds on to the entire type environment from the previous
1378 pruneHomePackageTable
1381 -> ([ModuleName],[ModuleName])
1384 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
1387 | is_stable modl = hmi'
1388 | otherwise = hmi'{ hm_details = emptyModDetails }
1390 modl = moduleName (mi_module (hm_iface hmi))
1391 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
1392 = hmi{ hm_linkable = Nothing }
1395 where ms = expectJust "prune" (lookupUFM ms_map modl)
1397 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
1399 is_stable m = m `elem` stable_obj || m `elem` stable_bco
1401 -- -----------------------------------------------------------------------------
1403 -- Return (names of) all those in modsDone who are part of a cycle
1404 -- as defined by theGraph.
1405 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1406 findPartiallyCompletedCycles modsDone theGraph
1410 chew ((AcyclicSCC _):rest) = chew rest -- acyclic? not interesting.
1411 chew ((CyclicSCC vs):rest)
1412 = let names_in_this_cycle = nub (map ms_mod vs)
1414 = nub ([done | done <- modsDone,
1415 done `elem` names_in_this_cycle])
1416 chewed_rest = chew rest
1418 if notNull mods_in_this_cycle
1419 && length mods_in_this_cycle < length names_in_this_cycle
1420 then mods_in_this_cycle ++ chewed_rest
1423 -- -----------------------------------------------------------------------------
1427 -- This is where we compile each module in the module graph, in a pass
1428 -- from the bottom to the top of the graph.
1430 -- There better had not be any cyclic groups here -- we check for them.
1434 WarnErrLogger -- ^ Called to print warnings and errors.
1435 -> HscEnv -- ^ Includes initially-empty HPT
1436 -> HomePackageTable -- ^ HPT from last time round (pruned)
1437 -> ([ModuleName],[ModuleName]) -- ^ stable modules (see checkStability)
1438 -> IO () -- ^ How to clean up unwanted tmp files
1439 -> [SCC ModSummary] -- ^ Mods to do (the worklist)
1441 HscEnv, -- With an updated HPT
1442 [ModSummary]) -- Mods which succeeded
1444 upsweep logger hsc_env old_hpt stable_mods cleanup sccs = do
1445 (res, hsc_env, done) <- upsweep' hsc_env old_hpt [] sccs 1 (length sccs)
1446 return (res, hsc_env, reverse done)
1449 upsweep' hsc_env _old_hpt done
1451 = return (Succeeded, hsc_env, done)
1453 upsweep' hsc_env _old_hpt done
1454 (CyclicSCC ms:_) _ _
1455 = do liftIO $ fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1456 return (Failed, hsc_env, done)
1458 upsweep' hsc_env old_hpt done
1459 (AcyclicSCC mod:mods) mod_index nmods
1460 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1461 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1462 -- (moduleEnvElts (hsc_HPT hsc_env)))
1465 <- handleSourceError
1466 (\err -> do logger (Just err); return Nothing) $ do
1467 mod_info <- upsweep_mod hsc_env old_hpt stable_mods
1469 logger Nothing -- log warnings
1470 return (Just mod_info)
1472 liftIO cleanup -- Remove unwanted tmp files between compilations
1475 Nothing -> return (Failed, hsc_env, done)
1477 let this_mod = ms_mod_name mod
1479 -- Add new info to hsc_env
1480 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1481 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1483 -- Space-saving: delete the old HPT entry
1484 -- for mod BUT if mod is a hs-boot
1485 -- node, don't delete it. For the
1486 -- interface, the HPT entry is probaby for the
1487 -- main Haskell source file. Deleting it
1488 -- would force the real module to be recompiled
1490 old_hpt1 | isBootSummary mod = old_hpt
1491 | otherwise = delFromUFM old_hpt this_mod
1495 -- fixup our HomePackageTable after we've finished compiling
1496 -- a mutually-recursive loop. See reTypecheckLoop, below.
1497 hsc_env2 <- liftIO $ reTypecheckLoop hsc_env1 mod done'
1499 upsweep' hsc_env2 old_hpt1 done' mods (mod_index+1) nmods
1501 -- | Compile a single module. Always produce a Linkable for it if
1502 -- successful. If no compilation happened, return the old Linkable.
1503 upsweep_mod :: GhcMonad m =>
1506 -> ([ModuleName],[ModuleName])
1508 -> Int -- index of module
1509 -> Int -- total number of modules
1512 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1514 this_mod_name = ms_mod_name summary
1515 this_mod = ms_mod summary
1516 mb_obj_date = ms_obj_date summary
1517 obj_fn = ml_obj_file (ms_location summary)
1518 hs_date = ms_hs_date summary
1520 is_stable_obj = this_mod_name `elem` stable_obj
1521 is_stable_bco = this_mod_name `elem` stable_bco
1523 old_hmi = lookupUFM old_hpt this_mod_name
1525 -- We're using the dflags for this module now, obtained by
1526 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1527 dflags = ms_hspp_opts summary
1528 prevailing_target = hscTarget (hsc_dflags hsc_env)
1529 local_target = hscTarget dflags
1531 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1532 -- we don't do anything dodgy: these should only work to change
1533 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1534 -- end up trying to link object code to byte code.
1535 target = if prevailing_target /= local_target
1536 && (not (isObjectTarget prevailing_target)
1537 || not (isObjectTarget local_target))
1538 then prevailing_target
1541 -- store the corrected hscTarget into the summary
1542 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1544 -- The old interface is ok if
1545 -- a) we're compiling a source file, and the old HPT
1546 -- entry is for a source file
1547 -- b) we're compiling a hs-boot file
1548 -- Case (b) allows an hs-boot file to get the interface of its
1549 -- real source file on the second iteration of the compilation
1550 -- manager, but that does no harm. Otherwise the hs-boot file
1551 -- will always be recompiled
1556 Just hm_info | isBootSummary summary -> Just iface
1557 | not (mi_boot iface) -> Just iface
1558 | otherwise -> Nothing
1560 iface = hm_iface hm_info
1562 compile_it :: GhcMonad m => Maybe Linkable -> m HomeModInfo
1563 compile_it = compile hsc_env summary' mod_index nmods mb_old_iface
1565 compile_it_discard_iface :: GhcMonad m =>
1566 Maybe Linkable -> m HomeModInfo
1567 compile_it_discard_iface
1568 = compile hsc_env summary' mod_index nmods Nothing
1574 -- Regardless of whether we're generating object code or
1575 -- byte code, we can always use an existing object file
1576 -- if it is *stable* (see checkStability).
1577 | is_stable_obj, isJust old_hmi ->
1578 let Just hmi = old_hmi in
1580 -- object is stable, and we have an entry in the
1581 -- old HPT: nothing to do
1583 | is_stable_obj, isNothing old_hmi -> do
1584 linkable <- liftIO $ findObjectLinkable this_mod obj_fn
1585 (expectJust "upsweep1" mb_obj_date)
1586 compile_it (Just linkable)
1587 -- object is stable, but we need to load the interface
1588 -- off disk to make a HMI.
1592 ASSERT(isJust old_hmi) -- must be in the old_hpt
1593 let Just hmi = old_hmi in
1595 -- BCO is stable: nothing to do
1597 | Just hmi <- old_hmi,
1598 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1599 linkableTime l >= ms_hs_date summary ->
1601 -- we have an old BCO that is up to date with respect
1602 -- to the source: do a recompilation check as normal.
1606 -- no existing code at all: we must recompile.
1608 -- When generating object code, if there's an up-to-date
1609 -- object file on the disk, then we can use it.
1610 -- However, if the object file is new (compared to any
1611 -- linkable we had from a previous compilation), then we
1612 -- must discard any in-memory interface, because this
1613 -- means the user has compiled the source file
1614 -- separately and generated a new interface, that we must
1615 -- read from the disk.
1617 obj | isObjectTarget obj,
1618 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1621 | Just l <- hm_linkable hmi,
1622 isObjectLinkable l && linkableTime l == obj_date
1623 -> compile_it (Just l)
1625 linkable <- liftIO $ findObjectLinkable this_mod obj_fn obj_date
1626 compile_it_discard_iface (Just linkable)
1633 -- Filter modules in the HPT
1634 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1635 retainInTopLevelEnvs keep_these hpt
1636 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1638 , let mb_mod_info = lookupUFM hpt mod
1639 , isJust mb_mod_info ]
1641 -- ---------------------------------------------------------------------------
1642 -- Typecheck module loops
1645 See bug #930. This code fixes a long-standing bug in --make. The
1646 problem is that when compiling the modules *inside* a loop, a data
1647 type that is only defined at the top of the loop looks opaque; but
1648 after the loop is done, the structure of the data type becomes
1651 The difficulty is then that two different bits of code have
1652 different notions of what the data type looks like.
1654 The idea is that after we compile a module which also has an .hs-boot
1655 file, we re-generate the ModDetails for each of the modules that
1656 depends on the .hs-boot file, so that everyone points to the proper
1657 TyCons, Ids etc. defined by the real module, not the boot module.
1658 Fortunately re-generating a ModDetails from a ModIface is easy: the
1659 function TcIface.typecheckIface does exactly that.
1661 Picking the modules to re-typecheck is slightly tricky. Starting from
1662 the module graph consisting of the modules that have already been
1663 compiled, we reverse the edges (so they point from the imported module
1664 to the importing module), and depth-first-search from the .hs-boot
1665 node. This gives us all the modules that depend transitively on the
1666 .hs-boot module, and those are exactly the modules that we need to
1669 Following this fix, GHC can compile itself with --make -O2.
1672 reTypecheckLoop :: HscEnv -> ModSummary -> ModuleGraph -> IO HscEnv
1673 reTypecheckLoop hsc_env ms graph
1674 | not (isBootSummary ms) &&
1675 any (\m -> ms_mod m == this_mod && isBootSummary m) graph
1677 let mss = reachableBackwards (ms_mod_name ms) graph
1678 non_boot = filter (not.isBootSummary) mss
1679 debugTraceMsg (hsc_dflags hsc_env) 2 $
1680 text "Re-typechecking loop: " <> ppr (map ms_mod_name non_boot)
1681 typecheckLoop hsc_env (map ms_mod_name non_boot)
1685 this_mod = ms_mod ms
1687 typecheckLoop :: HscEnv -> [ModuleName] -> IO HscEnv
1688 typecheckLoop hsc_env mods = do
1690 fixIO $ \new_hpt -> do
1691 let new_hsc_env = hsc_env{ hsc_HPT = new_hpt }
1692 mds <- initIfaceCheck new_hsc_env $
1693 mapM (typecheckIface . hm_iface) hmis
1694 let new_hpt = addListToUFM old_hpt
1695 (zip mods [ hmi{ hm_details = details }
1696 | (hmi,details) <- zip hmis mds ])
1698 return hsc_env{ hsc_HPT = new_hpt }
1700 old_hpt = hsc_HPT hsc_env
1701 hmis = map (expectJust "typecheckLoop" . lookupUFM old_hpt) mods
1703 reachableBackwards :: ModuleName -> [ModSummary] -> [ModSummary]
1704 reachableBackwards mod summaries
1705 = [ ms | (ms,_,_) <- reachableG (transposeG graph) root ]
1706 where -- the rest just sets up the graph:
1707 (graph, lookup_node) = moduleGraphNodes False summaries
1708 root = expectJust "reachableBackwards" (lookup_node HsBootFile mod)
1710 -- ---------------------------------------------------------------------------
1711 -- Topological sort of the module graph
1713 type SummaryNode = (ModSummary, Int, [Int])
1717 -- ^ Drop hi-boot nodes? (see below)
1721 -- ^ Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1722 -- The resulting list of strongly-connected-components is in topologically
1723 -- sorted order, starting with the module(s) at the bottom of the
1724 -- dependency graph (ie compile them first) and ending with the ones at
1727 -- Drop hi-boot nodes (first boolean arg)?
1729 -- - @False@: treat the hi-boot summaries as nodes of the graph,
1730 -- so the graph must be acyclic
1732 -- - @True@: eliminate the hi-boot nodes, and instead pretend
1733 -- the a source-import of Foo is an import of Foo
1734 -- The resulting graph has no hi-boot nodes, but can be cyclic
1736 topSortModuleGraph drop_hs_boot_nodes summaries mb_root_mod
1737 = map (fmap summaryNodeSummary) $ stronglyConnCompG initial_graph
1739 (graph, lookup_node) = moduleGraphNodes drop_hs_boot_nodes summaries
1741 initial_graph = case mb_root_mod of
1744 -- restrict the graph to just those modules reachable from
1745 -- the specified module. We do this by building a graph with
1746 -- the full set of nodes, and determining the reachable set from
1747 -- the specified node.
1748 let root | Just node <- lookup_node HsSrcFile root_mod, graph `hasVertexG` node = node
1749 | otherwise = ghcError (ProgramError "module does not exist")
1750 in graphFromEdgedVertices (seq root (reachableG graph root))
1752 summaryNodeKey :: SummaryNode -> Int
1753 summaryNodeKey (_, k, _) = k
1755 summaryNodeSummary :: SummaryNode -> ModSummary
1756 summaryNodeSummary (s, _, _) = s
1758 moduleGraphNodes :: Bool -> [ModSummary]
1759 -> (Graph SummaryNode, HscSource -> ModuleName -> Maybe SummaryNode)
1760 moduleGraphNodes drop_hs_boot_nodes summaries = (graphFromEdgedVertices nodes, lookup_node)
1762 numbered_summaries = zip summaries [1..]
1764 lookup_node :: HscSource -> ModuleName -> Maybe SummaryNode
1765 lookup_node hs_src mod = lookupFM node_map (mod, hs_src)
1767 lookup_key :: HscSource -> ModuleName -> Maybe Int
1768 lookup_key hs_src mod = fmap summaryNodeKey (lookup_node hs_src mod)
1770 node_map :: NodeMap SummaryNode
1771 node_map = listToFM [ ((moduleName (ms_mod s), ms_hsc_src s), node)
1772 | node@(s, _, _) <- nodes ]
1774 -- We use integers as the keys for the SCC algorithm
1775 nodes :: [SummaryNode]
1776 nodes = [ (s, key, out_keys)
1777 | (s, key) <- numbered_summaries
1778 -- Drop the hi-boot ones if told to do so
1779 , not (isBootSummary s && drop_hs_boot_nodes)
1780 , let out_keys = out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1781 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1782 (-- see [boot-edges] below
1783 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1785 else case lookup_key HsBootFile (ms_mod_name s) of
1789 -- [boot-edges] if this is a .hs and there is an equivalent
1790 -- .hs-boot, add a link from the former to the latter. This
1791 -- has the effect of detecting bogus cases where the .hs-boot
1792 -- depends on the .hs, by introducing a cycle. Additionally,
1793 -- it ensures that we will always process the .hs-boot before
1794 -- the .hs, and so the HomePackageTable will always have the
1795 -- most up to date information.
1797 -- Drop hs-boot nodes by using HsSrcFile as the key
1798 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1799 | otherwise = HsBootFile
1801 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1802 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1803 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1804 -- the IsBootInterface parameter True; else False
1807 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1808 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1810 msKey :: ModSummary -> NodeKey
1811 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1813 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1814 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1816 nodeMapElts :: NodeMap a -> [a]
1817 nodeMapElts = eltsFM
1819 -- | If there are {-# SOURCE #-} imports between strongly connected
1820 -- components in the topological sort, then those imports can
1821 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1822 -- were necessary, then the edge would be part of a cycle.
1823 warnUnnecessarySourceImports :: GhcMonad m => DynFlags -> [SCC ModSummary] -> m ()
1824 warnUnnecessarySourceImports dflags sccs =
1825 liftIO $ printBagOfWarnings dflags (listToBag (concatMap (check.flattenSCC) sccs))
1827 let mods_in_this_cycle = map ms_mod_name ms in
1828 [ warn i | m <- ms, i <- ms_srcimps m,
1829 unLoc i `notElem` mods_in_this_cycle ]
1831 warn :: Located ModuleName -> WarnMsg
1834 (ptext (sLit "Warning: {-# SOURCE #-} unnecessary in import of ")
1835 <+> quotes (ppr mod))
1837 -----------------------------------------------------------------------------
1838 -- Downsweep (dependency analysis)
1840 -- Chase downwards from the specified root set, returning summaries
1841 -- for all home modules encountered. Only follow source-import
1844 -- We pass in the previous collection of summaries, which is used as a
1845 -- cache to avoid recalculating a module summary if the source is
1848 -- The returned list of [ModSummary] nodes has one node for each home-package
1849 -- module, plus one for any hs-boot files. The imports of these nodes
1850 -- are all there, including the imports of non-home-package modules.
1852 downsweep :: GhcMonad m =>
1854 -> [ModSummary] -- Old summaries
1855 -> [ModuleName] -- Ignore dependencies on these; treat
1856 -- them as if they were package modules
1857 -> Bool -- True <=> allow multiple targets to have
1858 -- the same module name; this is
1859 -- very useful for ghc -M
1861 -- The elts of [ModSummary] all have distinct
1862 -- (Modules, IsBoot) identifiers, unless the Bool is true
1863 -- in which case there can be repeats
1864 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1865 = do -- catch error messages and return them
1866 --handleErrMsg -- should be covered by GhcMonad now
1867 -- (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1868 rootSummaries <- mapM getRootSummary roots
1869 let root_map = mkRootMap rootSummaries
1870 checkDuplicates root_map
1871 summs <- loop (concatMap msDeps rootSummaries) root_map
1874 roots = hsc_targets hsc_env
1876 old_summary_map :: NodeMap ModSummary
1877 old_summary_map = mkNodeMap old_summaries
1879 getRootSummary :: GhcMonad m => Target -> m ModSummary
1880 getRootSummary (Target (TargetFile file mb_phase) obj_allowed maybe_buf)
1881 = do exists <- liftIO $ doesFileExist file
1883 then summariseFile hsc_env old_summaries file mb_phase
1884 obj_allowed maybe_buf
1885 else throwOneError $ mkPlainErrMsg noSrcSpan $
1886 text "can't find file:" <+> text file
1887 getRootSummary (Target (TargetModule modl) obj_allowed maybe_buf)
1888 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1889 (L rootLoc modl) obj_allowed
1891 case maybe_summary of
1892 Nothing -> packageModErr modl
1895 rootLoc = mkGeneralSrcSpan (fsLit "<command line>")
1897 -- In a root module, the filename is allowed to diverge from the module
1898 -- name, so we have to check that there aren't multiple root files
1899 -- defining the same module (otherwise the duplicates will be silently
1900 -- ignored, leading to confusing behaviour).
1901 checkDuplicates :: GhcMonad m => NodeMap [ModSummary] -> m ()
1902 checkDuplicates root_map
1903 | allow_dup_roots = return ()
1904 | null dup_roots = return ()
1905 | otherwise = liftIO $ multiRootsErr (head dup_roots)
1907 dup_roots :: [[ModSummary]] -- Each at least of length 2
1908 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1910 loop :: GhcMonad m =>
1911 [(Located ModuleName,IsBootInterface)]
1912 -- Work list: process these modules
1913 -> NodeMap [ModSummary]
1914 -- Visited set; the range is a list because
1915 -- the roots can have the same module names
1916 -- if allow_dup_roots is True
1918 -- The result includes the worklist, except
1919 -- for those mentioned in the visited set
1920 loop [] done = return (concat (nodeMapElts done))
1921 loop ((wanted_mod, is_boot) : ss) done
1922 | Just summs <- lookupFM done key
1923 = if isSingleton summs then
1926 do { liftIO $ multiRootsErr summs; return [] }
1928 = do mb_s <- summariseModule hsc_env old_summary_map
1929 is_boot wanted_mod True
1932 Nothing -> loop ss done
1933 Just s -> loop (msDeps s ++ ss) (addToFM done key [s])
1935 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1937 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1938 mkRootMap summaries = addListToFM_C (++) emptyFM
1939 [ (msKey s, [s]) | s <- summaries ]
1941 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1942 -- (msDeps s) returns the dependencies of the ModSummary s.
1943 -- A wrinkle is that for a {-# SOURCE #-} import we return
1944 -- *both* the hs-boot file
1945 -- *and* the source file
1946 -- as "dependencies". That ensures that the list of all relevant
1947 -- modules always contains B.hs if it contains B.hs-boot.
1948 -- Remember, this pass isn't doing the topological sort. It's
1949 -- just gathering the list of all relevant ModSummaries
1951 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1952 ++ [ (m,False) | m <- ms_imps s ]
1954 -----------------------------------------------------------------------------
1955 -- Summarising modules
1957 -- We have two types of summarisation:
1959 -- * Summarise a file. This is used for the root module(s) passed to
1960 -- cmLoadModules. The file is read, and used to determine the root
1961 -- module name. The module name may differ from the filename.
1963 -- * Summarise a module. We are given a module name, and must provide
1964 -- a summary. The finder is used to locate the file in which the module
1970 -> [ModSummary] -- old summaries
1971 -> FilePath -- source file name
1972 -> Maybe Phase -- start phase
1973 -> Bool -- object code allowed?
1974 -> Maybe (StringBuffer,ClockTime)
1977 summariseFile hsc_env old_summaries file mb_phase obj_allowed maybe_buf
1978 -- we can use a cached summary if one is available and the
1979 -- source file hasn't changed, But we have to look up the summary
1980 -- by source file, rather than module name as we do in summarise.
1981 | Just old_summary <- findSummaryBySourceFile old_summaries file
1983 let location = ms_location old_summary
1985 -- return the cached summary if the source didn't change
1986 src_timestamp <- case maybe_buf of
1987 Just (_,t) -> return t
1988 Nothing -> liftIO $ getModificationTime file
1989 -- The file exists; we checked in getRootSummary above.
1990 -- If it gets removed subsequently, then this
1991 -- getModificationTime may fail, but that's the right
1994 if ms_hs_date old_summary == src_timestamp
1995 then do -- update the object-file timestamp
1997 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
1998 || obj_allowed -- bug #1205
1999 then liftIO $ getObjTimestamp location False
2001 return old_summary{ ms_obj_date = obj_timestamp }
2009 let dflags = hsc_dflags hsc_env
2011 (dflags', hspp_fn, buf)
2012 <- preprocessFile hsc_env file mb_phase maybe_buf
2014 (srcimps,the_imps, L _ mod_name) <- liftIO $ getImports dflags' buf hspp_fn file
2016 -- Make a ModLocation for this file
2017 location <- liftIO $ mkHomeModLocation dflags mod_name file
2019 -- Tell the Finder cache where it is, so that subsequent calls
2020 -- to findModule will find it, even if it's not on any search path
2021 mod <- liftIO $ addHomeModuleToFinder hsc_env mod_name location
2023 src_timestamp <- case maybe_buf of
2024 Just (_,t) -> return t
2025 Nothing -> liftIO $ getModificationTime file
2026 -- getMofificationTime may fail
2028 -- when the user asks to load a source file by name, we only
2029 -- use an object file if -fobject-code is on. See #1205.
2031 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
2032 || obj_allowed -- bug #1205
2033 then liftIO $ modificationTimeIfExists (ml_obj_file location)
2036 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
2037 ms_location = location,
2038 ms_hspp_file = hspp_fn,
2039 ms_hspp_opts = dflags',
2040 ms_hspp_buf = Just buf,
2041 ms_srcimps = srcimps, ms_imps = the_imps,
2042 ms_hs_date = src_timestamp,
2043 ms_obj_date = obj_timestamp })
2045 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
2046 findSummaryBySourceFile summaries file
2047 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
2048 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
2052 -- Summarise a module, and pick up source and timestamp.
2056 -> NodeMap ModSummary -- Map of old summaries
2057 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
2058 -> Located ModuleName -- Imported module to be summarised
2059 -> Bool -- object code allowed?
2060 -> Maybe (StringBuffer, ClockTime)
2061 -> [ModuleName] -- Modules to exclude
2062 -> m (Maybe ModSummary) -- Its new summary
2064 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod)
2065 obj_allowed maybe_buf excl_mods
2066 | wanted_mod `elem` excl_mods
2069 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
2070 = do -- Find its new timestamp; all the
2071 -- ModSummaries in the old map have valid ml_hs_files
2072 let location = ms_location old_summary
2073 src_fn = expectJust "summariseModule" (ml_hs_file location)
2075 -- check the modification time on the source file, and
2076 -- return the cached summary if it hasn't changed. If the
2077 -- file has disappeared, we need to call the Finder again.
2079 Just (_,t) -> check_timestamp old_summary location src_fn t
2081 m <- liftIO $ System.IO.Error.try (getModificationTime src_fn)
2083 Right t -> check_timestamp old_summary location src_fn t
2084 Left e | isDoesNotExistError e -> find_it
2085 | otherwise -> liftIO $ ioError e
2087 | otherwise = find_it
2089 dflags = hsc_dflags hsc_env
2091 hsc_src = if is_boot then HsBootFile else HsSrcFile
2093 check_timestamp old_summary location src_fn src_timestamp
2094 | ms_hs_date old_summary == src_timestamp = do
2095 -- update the object-file timestamp
2096 obj_timestamp <- liftIO $
2097 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
2098 || obj_allowed -- bug #1205
2099 then getObjTimestamp location is_boot
2101 return (Just old_summary{ ms_obj_date = obj_timestamp })
2103 -- source changed: re-summarise.
2104 new_summary location (ms_mod old_summary) src_fn src_timestamp
2107 -- Don't use the Finder's cache this time. If the module was
2108 -- previously a package module, it may have now appeared on the
2109 -- search path, so we want to consider it to be a home module. If
2110 -- the module was previously a home module, it may have moved.
2111 liftIO $ uncacheModule hsc_env wanted_mod
2112 found <- liftIO $ findImportedModule hsc_env wanted_mod Nothing
2115 | isJust (ml_hs_file location) ->
2117 just_found location mod
2119 -- Drop external-pkg
2120 ASSERT(modulePackageId mod /= thisPackage dflags)
2123 err -> liftIO $ noModError dflags loc wanted_mod err
2126 just_found location mod = do
2127 -- Adjust location to point to the hs-boot source file,
2128 -- hi file, object file, when is_boot says so
2129 let location' | is_boot = addBootSuffixLocn location
2130 | otherwise = location
2131 src_fn = expectJust "summarise2" (ml_hs_file location')
2133 -- Check that it exists
2134 -- It might have been deleted since the Finder last found it
2135 maybe_t <- liftIO $ modificationTimeIfExists src_fn
2137 Nothing -> noHsFileErr loc src_fn
2138 Just t -> new_summary location' mod src_fn t
2141 new_summary location mod src_fn src_timestamp
2143 -- Preprocess the source file and get its imports
2144 -- The dflags' contains the OPTIONS pragmas
2145 (dflags', hspp_fn, buf) <- preprocessFile hsc_env src_fn Nothing maybe_buf
2146 (srcimps, the_imps, L mod_loc mod_name) <- liftIO $ getImports dflags' buf hspp_fn src_fn
2148 when (mod_name /= wanted_mod) $
2149 throwOneError $ mkPlainErrMsg mod_loc $
2150 text "File name does not match module name:"
2151 $$ text "Saw:" <+> quotes (ppr mod_name)
2152 $$ text "Expected:" <+> quotes (ppr wanted_mod)
2154 -- Find the object timestamp, and return the summary
2155 obj_timestamp <- liftIO $
2156 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
2157 || obj_allowed -- bug #1205
2158 then getObjTimestamp location is_boot
2161 return (Just (ModSummary { ms_mod = mod,
2162 ms_hsc_src = hsc_src,
2163 ms_location = location,
2164 ms_hspp_file = hspp_fn,
2165 ms_hspp_opts = dflags',
2166 ms_hspp_buf = Just buf,
2167 ms_srcimps = srcimps,
2169 ms_hs_date = src_timestamp,
2170 ms_obj_date = obj_timestamp }))
2173 getObjTimestamp :: ModLocation -> Bool -> IO (Maybe ClockTime)
2174 getObjTimestamp location is_boot
2175 = if is_boot then return Nothing
2176 else modificationTimeIfExists (ml_obj_file location)
2179 preprocessFile :: GhcMonad m =>
2182 -> Maybe Phase -- ^ Starting phase
2183 -> Maybe (StringBuffer,ClockTime)
2184 -> m (DynFlags, FilePath, StringBuffer)
2185 preprocessFile hsc_env src_fn mb_phase Nothing
2187 (dflags', hspp_fn) <- preprocess hsc_env (src_fn, mb_phase)
2188 buf <- liftIO $ hGetStringBuffer hspp_fn
2189 return (dflags', hspp_fn, buf)
2191 preprocessFile hsc_env src_fn mb_phase (Just (buf, _time))
2193 let dflags = hsc_dflags hsc_env
2194 -- case we bypass the preprocessing stage?
2196 local_opts = getOptions dflags buf src_fn
2198 (dflags', leftovers, warns)
2199 <- parseDynamicNoPackageFlags dflags local_opts
2200 liftIO $ checkProcessArgsResult leftovers -- XXX: throws exceptions
2201 liftIO $ handleFlagWarnings dflags' warns -- XXX: throws exceptions
2205 | Just (Unlit _) <- mb_phase = True
2206 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
2207 -- note: local_opts is only required if there's no Unlit phase
2208 | dopt Opt_Cpp dflags' = True
2209 | dopt Opt_Pp dflags' = True
2212 when needs_preprocessing $
2213 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
2215 return (dflags', src_fn, buf)
2218 -----------------------------------------------------------------------------
2220 -----------------------------------------------------------------------------
2222 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
2223 -- ToDo: we don't have a proper line number for this error
2224 noModError dflags loc wanted_mod err
2225 = throwOneError $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
2227 noHsFileErr :: GhcMonad m => SrcSpan -> String -> m a
2228 noHsFileErr loc path
2229 = throwOneError $ mkPlainErrMsg loc $ text "Can't find" <+> text path
2231 packageModErr :: GhcMonad m => ModuleName -> m a
2233 = throwOneError $ mkPlainErrMsg noSrcSpan $
2234 text "module" <+> quotes (ppr mod) <+> text "is a package module"
2236 multiRootsErr :: [ModSummary] -> IO ()
2237 multiRootsErr [] = panic "multiRootsErr"
2238 multiRootsErr summs@(summ1:_)
2239 = throwOneError $ mkPlainErrMsg noSrcSpan $
2240 text "module" <+> quotes (ppr mod) <+>
2241 text "is defined in multiple files:" <+>
2242 sep (map text files)
2245 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
2247 cyclicModuleErr :: [ModSummary] -> SDoc
2249 = hang (ptext (sLit "Module imports form a cycle for modules:"))
2250 2 (vcat (map show_one ms))
2252 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
2253 nest 2 $ ptext (sLit "imports:") <+>
2254 (pp_imps HsBootFile (ms_srcimps ms)
2255 $$ pp_imps HsSrcFile (ms_imps ms))]
2256 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
2257 pp_imps src mods = fsep (map (show_mod src) mods)
2260 -- | Inform GHC that the working directory has changed. GHC will flush
2261 -- its cache of module locations, since it may no longer be valid.
2262 -- Note: if you change the working directory, you should also unload
2263 -- the current program (set targets to empty, followed by load).
2264 workingDirectoryChanged :: GhcMonad m => m ()
2265 workingDirectoryChanged = withSession $ (liftIO . flushFinderCaches)
2267 -- -----------------------------------------------------------------------------
2268 -- inspecting the session
2270 -- | Get the module dependency graph.
2271 getModuleGraph :: GhcMonad m => m ModuleGraph -- ToDo: DiGraph ModSummary
2272 getModuleGraph = liftM hsc_mod_graph getSession
2274 -- | Return @True@ <==> module is loaded.
2275 isLoaded :: GhcMonad m => ModuleName -> m Bool
2276 isLoaded m = withSession $ \hsc_env ->
2277 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
2279 -- | Return the bindings for the current interactive session.
2280 getBindings :: GhcMonad m => m [TyThing]
2281 getBindings = withSession $ \hsc_env ->
2282 -- we have to implement the shadowing behaviour of ic_tmp_ids here
2283 -- (see InteractiveContext) and the quickest way is to use an OccEnv.
2285 tmp_ids = ic_tmp_ids (hsc_IC hsc_env)
2286 filtered = foldr f (const []) tmp_ids emptyUniqSet
2288 | uniq `elementOfUniqSet` set = rest set
2289 | otherwise = AnId id : rest (addOneToUniqSet set uniq)
2290 where uniq = getUnique (nameOccName (idName id))
2294 getPrintUnqual :: GhcMonad m => m PrintUnqualified
2295 getPrintUnqual = withSession $ \hsc_env ->
2296 return (icPrintUnqual (hsc_dflags hsc_env) (hsc_IC hsc_env))
2298 -- | Container for information about a 'Module'.
2299 data ModuleInfo = ModuleInfo {
2300 minf_type_env :: TypeEnv,
2301 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
2302 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
2303 minf_instances :: [Instance]
2305 ,minf_modBreaks :: ModBreaks
2307 -- ToDo: this should really contain the ModIface too
2309 -- We don't want HomeModInfo here, because a ModuleInfo applies
2310 -- to package modules too.
2312 -- | Request information about a loaded 'Module'
2313 getModuleInfo :: GhcMonad m => Module -> m (Maybe ModuleInfo) -- XXX: Maybe X
2314 getModuleInfo mdl = withSession $ \hsc_env -> do
2315 let mg = hsc_mod_graph hsc_env
2316 if mdl `elem` map ms_mod mg
2317 then liftIO $ getHomeModuleInfo hsc_env (moduleName mdl)
2319 {- if isHomeModule (hsc_dflags hsc_env) mdl
2321 else -} liftIO $ getPackageModuleInfo hsc_env mdl
2322 -- getPackageModuleInfo will attempt to find the interface, so
2323 -- we don't want to call it for a home module, just in case there
2324 -- was a problem loading the module and the interface doesn't
2325 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
2327 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
2329 getPackageModuleInfo hsc_env mdl = do
2330 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
2332 Nothing -> return Nothing
2334 eps <- readIORef (hsc_EPS hsc_env)
2336 names = availsToNameSet avails
2338 tys = [ ty | name <- concatMap availNames avails,
2339 Just ty <- [lookupTypeEnv pte name] ]
2341 return (Just (ModuleInfo {
2342 minf_type_env = mkTypeEnv tys,
2343 minf_exports = names,
2344 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
2345 minf_instances = error "getModuleInfo: instances for package module unimplemented",
2346 minf_modBreaks = emptyModBreaks
2349 getPackageModuleInfo _hsc_env _mdl = do
2350 -- bogusly different for non-GHCI (ToDo)
2354 getHomeModuleInfo :: HscEnv -> ModuleName -> IO (Maybe ModuleInfo)
2355 getHomeModuleInfo hsc_env mdl =
2356 case lookupUFM (hsc_HPT hsc_env) mdl of
2357 Nothing -> return Nothing
2359 let details = hm_details hmi
2360 return (Just (ModuleInfo {
2361 minf_type_env = md_types details,
2362 minf_exports = availsToNameSet (md_exports details),
2363 minf_rdr_env = mi_globals $! hm_iface hmi,
2364 minf_instances = md_insts details
2366 ,minf_modBreaks = getModBreaks hmi
2370 -- | The list of top-level entities defined in a module
2371 modInfoTyThings :: ModuleInfo -> [TyThing]
2372 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
2374 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
2375 modInfoTopLevelScope minf
2376 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
2378 modInfoExports :: ModuleInfo -> [Name]
2379 modInfoExports minf = nameSetToList $! minf_exports minf
2381 -- | Returns the instances defined by the specified module.
2382 -- Warning: currently unimplemented for package modules.
2383 modInfoInstances :: ModuleInfo -> [Instance]
2384 modInfoInstances = minf_instances
2386 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
2387 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
2389 mkPrintUnqualifiedForModule :: GhcMonad m =>
2391 -> m (Maybe PrintUnqualified) -- XXX: returns a Maybe X
2392 mkPrintUnqualifiedForModule minf = withSession $ \hsc_env -> do
2393 return (fmap (mkPrintUnqualified (hsc_dflags hsc_env)) (minf_rdr_env minf))
2395 modInfoLookupName :: GhcMonad m =>
2397 -> m (Maybe TyThing) -- XXX: returns a Maybe X
2398 modInfoLookupName minf name = withSession $ \hsc_env -> do
2399 case lookupTypeEnv (minf_type_env minf) name of
2400 Just tyThing -> return (Just tyThing)
2402 eps <- liftIO $ readIORef (hsc_EPS hsc_env)
2403 return $! lookupType (hsc_dflags hsc_env)
2404 (hsc_HPT hsc_env) (eps_PTE eps) name
2407 modInfoModBreaks :: ModuleInfo -> ModBreaks
2408 modInfoModBreaks = minf_modBreaks
2411 isDictonaryId :: Id -> Bool
2413 = case tcSplitSigmaTy (idType id) of { (_tvs, _theta, tau) -> isDictTy tau }
2415 -- | Looks up a global name: that is, any top-level name in any
2416 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
2417 -- the interactive context, and therefore does not require a preceding
2419 lookupGlobalName :: GhcMonad m => Name -> m (Maybe TyThing)
2420 lookupGlobalName name = withSession $ \hsc_env -> do
2421 liftIO $ lookupTypeHscEnv hsc_env name
2423 findGlobalAnns :: (GhcMonad m, Typeable a) => ([Word8] -> a) -> AnnTarget Name -> m [a]
2424 findGlobalAnns deserialize target = withSession $ \hsc_env -> do
2425 ann_env <- liftIO $ prepareAnnotations hsc_env Nothing
2426 return (findAnns deserialize ann_env target)
2429 -- | get the GlobalRdrEnv for a session
2430 getGRE :: GhcMonad m => m GlobalRdrEnv
2431 getGRE = withSession $ \hsc_env-> return $ ic_rn_gbl_env (hsc_IC hsc_env)
2434 -- -----------------------------------------------------------------------------
2436 -- | Return all /external/ modules available in the package database.
2437 -- Modules from the current session (i.e., from the 'HomePackageTable') are
2439 packageDbModules :: GhcMonad m =>
2440 Bool -- ^ Only consider exposed packages.
2442 packageDbModules only_exposed = do
2443 dflags <- getSessionDynFlags
2444 let pkgs = UFM.eltsUFM (pkgIdMap (pkgState dflags))
2446 [ mkModule pid modname | p <- pkgs
2447 , not only_exposed || exposed p
2448 , pid <- [mkPackageId (package p)]
2449 , modname <- exposedModules p ]
2451 -- -----------------------------------------------------------------------------
2452 -- Misc exported utils
2454 dataConType :: DataCon -> Type
2455 dataConType dc = idType (dataConWrapId dc)
2457 -- | print a 'NamedThing', adding parentheses if the name is an operator.
2458 pprParenSymName :: NamedThing a => a -> SDoc
2459 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
2461 -- ----------------------------------------------------------------------------
2466 -- - Data and Typeable instances for HsSyn.
2468 -- ToDo: check for small transformations that happen to the syntax in
2469 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
2471 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
2472 -- to get from TyCons, Ids etc. to TH syntax (reify).
2474 -- :browse will use either lm_toplev or inspect lm_interface, depending
2475 -- on whether the module is interpreted or not.
2479 -- Extract the filename, stringbuffer content and dynflags associed to a module
2481 -- XXX: Explain pre-conditions
2482 getModuleSourceAndFlags :: GhcMonad m => Module -> m (String, StringBuffer, DynFlags)
2483 getModuleSourceAndFlags mod = do
2484 m <- getModSummary (moduleName mod)
2485 case ml_hs_file $ ms_location m of
2486 Nothing -> throw $ mkApiErr (text "No source available for module " <+> ppr mod)
2487 Just sourceFile -> do
2488 source <- liftIO $ hGetStringBuffer sourceFile
2489 return (sourceFile, source, ms_hspp_opts m)
2492 -- | Return module source as token stream, including comments.
2494 -- The module must be in the module graph and its source must be available.
2495 -- Throws a 'HscTypes.SourceError' on parse error.
2496 getTokenStream :: GhcMonad m => Module -> m [Located Token]
2497 getTokenStream mod = do
2498 (sourceFile, source, flags) <- getModuleSourceAndFlags mod
2499 let startLoc = mkSrcLoc (mkFastString sourceFile) 0 0
2500 case lexTokenStream source startLoc flags of
2501 POk _ ts -> return ts
2502 PFailed span err -> throw $ mkSrcErr (unitBag $ mkPlainErrMsg span err)
2504 -- | Give even more information on the source than 'getTokenStream'
2505 -- This function allows reconstructing the source completely with
2506 -- 'showRichTokenStream'.
2507 getRichTokenStream :: GhcMonad m => Module -> m [(Located Token, String)]
2508 getRichTokenStream mod = do
2509 (sourceFile, source, flags) <- getModuleSourceAndFlags mod
2510 let startLoc = mkSrcLoc (mkFastString sourceFile) 0 0
2511 case lexTokenStream source startLoc flags of
2512 POk _ ts -> return $ addSourceToTokens startLoc source ts
2513 PFailed span err -> throw $ mkSrcErr (unitBag $ mkPlainErrMsg span err)
2515 -- | Given a source location and a StringBuffer corresponding to this
2516 -- location, return a rich token stream with the source associated to the
2518 addSourceToTokens :: SrcLoc -> StringBuffer -> [Located Token]
2519 -> [(Located Token, String)]
2520 addSourceToTokens _ _ [] = []
2521 addSourceToTokens loc buf (t@(L span _) : ts)
2522 | not (isGoodSrcSpan span) = (t,"") : addSourceToTokens loc buf ts
2523 | otherwise = (t,str) : addSourceToTokens newLoc newBuf ts
2525 (newLoc, newBuf, str) = go "" loc buf
2526 start = srcSpanStart span
2527 end = srcSpanEnd span
2528 go acc loc buf | loc < start = go acc nLoc nBuf
2529 | start <= loc && loc < end = go (ch:acc) nLoc nBuf
2530 | otherwise = (loc, buf, reverse acc)
2531 where (ch, nBuf) = nextChar buf
2532 nLoc = advanceSrcLoc loc ch
2535 -- | Take a rich token stream such as produced from 'getRichTokenStream' and
2536 -- return source code almost identical to the original code (except for
2537 -- insignificant whitespace.)
2538 showRichTokenStream :: [(Located Token, String)] -> String
2539 showRichTokenStream ts = go startLoc ts ""
2540 where sourceFile = srcSpanFile (getLoc . fst . head $ ts)
2541 startLoc = mkSrcLoc sourceFile 0 0
2543 go loc ((L span _, str):ts)
2544 | not (isGoodSrcSpan span) = go loc ts
2545 | locLine == tokLine = ((replicate (tokCol - locCol) ' ') ++)
2548 | otherwise = ((replicate (tokLine - locLine) '\n') ++)
2549 . ((replicate tokCol ' ') ++)
2552 where (locLine, locCol) = (srcLocLine loc, srcLocCol loc)
2553 (tokLine, tokCol) = (srcSpanStartLine span, srcSpanStartCol span)
2554 tokEnd = srcSpanEnd span
2556 -- -----------------------------------------------------------------------------
2557 -- Interactive evaluation
2559 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
2560 -- filesystem and package database to find the corresponding 'Module',
2561 -- using the algorithm that is used for an @import@ declaration.
2562 findModule :: GhcMonad m => ModuleName -> Maybe FastString -> m Module
2563 findModule mod_name maybe_pkg = withSession $ \hsc_env -> liftIO $ -- XXX
2565 dflags = hsc_dflags hsc_env
2566 hpt = hsc_HPT hsc_env
2567 this_pkg = thisPackage dflags
2569 case lookupUFM hpt mod_name of
2570 Just mod_info -> return (mi_module (hm_iface mod_info))
2571 _not_a_home_module -> do
2572 res <- findImportedModule hsc_env mod_name maybe_pkg
2574 Found _ m | modulePackageId m /= this_pkg -> return m
2575 | otherwise -> ghcError (CmdLineError (showSDoc $
2576 text "module" <+> quotes (ppr (moduleName m)) <+>
2577 text "is not loaded"))
2578 err -> let msg = cannotFindModule dflags mod_name err in
2579 ghcError (CmdLineError (showSDoc msg))
2582 getHistorySpan :: GhcMonad m => History -> m SrcSpan
2583 getHistorySpan h = withSession $ \hsc_env ->
2584 return$ InteractiveEval.getHistorySpan hsc_env h
2586 obtainTermFromVal :: GhcMonad m => Int -> Bool -> Type -> a -> m Term
2587 obtainTermFromVal bound force ty a =
2588 withSession $ \hsc_env ->
2589 liftIO $ InteractiveEval.obtainTermFromVal hsc_env bound force ty a
2591 obtainTermFromId :: GhcMonad m => Int -> Bool -> Id -> m Term
2592 obtainTermFromId bound force id =
2593 withSession $ \hsc_env ->
2594 liftIO $ InteractiveEval.obtainTermFromId hsc_env bound force id