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 moduleInfo, renamedSource, typecheckedSource,
53 parsedSource, coreModule,
54 compileToCoreModule, compileToCoreSimplified,
58 -- * Parsing Haddock comments
61 -- * Inspecting the module structure of the program
62 ModuleGraph, ModSummary(..), ms_mod_name, ModLocation(..),
67 -- * Inspecting modules
74 modInfoIsExportedName,
77 mkPrintUnqualifiedForModule,
80 PrintUnqualified, alwaysQualify,
82 -- * Interactive evaluation
83 getBindings, getPrintUnqual,
86 setContext, getContext,
96 runStmt, SingleStep(..),
98 Resume(resumeStmt, resumeThreadId, resumeBreakInfo, resumeSpan,
99 resumeHistory, resumeHistoryIx),
100 History(historyBreakInfo, historyEnclosingDecl),
101 GHC.getHistorySpan, getHistoryModule,
104 InteractiveEval.back,
105 InteractiveEval.forward,
108 InteractiveEval.compileExpr, HValue, dynCompileExpr,
110 GHC.obtainTermFromId, GHC.obtainTermFromVal, reconstructType,
112 ModBreaks(..), BreakIndex,
113 BreakInfo(breakInfo_number, breakInfo_module),
114 BreakArray, setBreakOn, setBreakOff, getBreak,
117 -- * Abstract syntax elements
123 Module, mkModule, pprModule, moduleName, modulePackageId,
124 ModuleName, mkModuleName, moduleNameString,
128 isExternalName, nameModule, pprParenSymName, nameSrcSpan,
130 RdrName(Qual,Unqual),
134 isImplicitId, isDeadBinder,
135 isExportedId, isLocalId, isGlobalId,
137 isPrimOpId, isFCallId, isClassOpId_maybe,
138 isDataConWorkId, idDataCon,
139 isBottomingId, isDictonaryId,
140 recordSelectorFieldLabel,
142 -- ** Type constructors
144 tyConTyVars, tyConDataCons, tyConArity,
145 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
147 synTyConDefn, synTyConType, synTyConResKind,
153 -- ** Data constructors
155 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
156 dataConIsInfix, isVanillaDataCon,
158 StrictnessMark(..), isMarkedStrict,
162 classMethods, classSCTheta, classTvsFds,
167 instanceDFunId, pprInstance, pprInstanceHdr,
169 -- ** Types and Kinds
170 Type, splitForAllTys, funResultTy,
171 pprParendType, pprTypeApp,
174 ThetaType, pprThetaArrow,
180 module HsSyn, -- ToDo: remove extraneous bits
184 defaultFixity, maxPrecedence,
188 -- ** Source locations
190 mkSrcLoc, isGoodSrcLoc, noSrcLoc,
191 srcLocFile, srcLocLine, srcLocCol,
193 mkSrcSpan, srcLocSpan, isGoodSrcSpan, noSrcSpan,
194 srcSpanStart, srcSpanEnd,
196 srcSpanStartLine, srcSpanEndLine,
197 srcSpanStartCol, srcSpanEndCol,
202 -- *** Constructing Located
203 noLoc, mkGeneralLocated,
205 -- *** Deconstructing Located
208 -- *** Combining and comparing Located values
209 eqLocated, cmpLocated, combineLocs, addCLoc,
210 leftmost_smallest, leftmost_largest, rightmost,
214 GhcException(..), showGhcException,
216 -- * Token stream manipulations
218 getTokenStream, getRichTokenStream,
219 showRichTokenStream, addSourceToTokens,
229 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
230 * what StaticFlags should we expose, if any?
233 #include "HsVersions.h"
236 import qualified Linker
237 import Linker ( HValue )
241 import InteractiveEval
246 import TcRnTypes hiding (LIE)
247 import TcRnMonad ( initIfaceCheck )
251 import qualified HsSyn -- hack as we want to reexport the whole module
252 import HsSyn hiding ((<.>))
253 import Type hiding (typeKind)
254 import TcType hiding (typeKind)
257 import TysPrim ( alphaTyVars )
262 import Name hiding ( varName )
263 import OccName ( parenSymOcc )
264 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr,
266 import FamInstEnv ( emptyFamInstEnv )
270 import DriverPipeline
271 import DriverPhases ( HscSource(..), Phase(..), isHaskellSrcFilename, startPhase )
277 import StaticFlagParser
278 import qualified StaticFlags
279 import SysTools ( initSysTools, cleanTempFiles, cleanTempFilesExcept,
288 import Bag ( unitBag, listToBag, emptyBag, isEmptyBag )
292 import StringBuffer ( StringBuffer, hGetStringBuffer, nextChar )
295 import Maybes ( expectJust, mapCatMaybes )
297 import HaddockLex ( tokenise )
301 import Control.Concurrent
302 import System.Directory ( getModificationTime, doesFileExist,
303 getCurrentDirectory )
306 import qualified Data.List as List
308 import System.Exit ( exitWith, ExitCode(..) )
309 import System.Time ( ClockTime, getClockTime )
312 import System.FilePath
314 import System.IO.Error ( try, isDoesNotExistError )
315 import Prelude hiding (init)
318 -- -----------------------------------------------------------------------------
319 -- Exception handlers
321 -- | Install some default exception handlers and run the inner computation.
322 -- Unless you want to handle exceptions yourself, you should wrap this around
323 -- the top level of your program. The default handlers output the error
324 -- message(s) to stderr and exit cleanly.
325 defaultErrorHandler :: (ExceptionMonad m, MonadIO m) => DynFlags -> m a -> m a
326 defaultErrorHandler dflags inner =
327 -- top-level exception handler: any unrecognised exception is a compiler bug.
328 ghandle (\exception -> liftIO $ do
330 case fromException exception of
331 -- an IO exception probably isn't our fault, so don't panic
332 Just (ioe :: IOException) ->
333 fatalErrorMsg dflags (text (show ioe))
334 _ -> case fromException exception of
335 Just StackOverflow ->
336 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
337 _ -> case fromException exception of
338 Just (ex :: ExitCode) -> throw ex
341 (text (show (Panic (show exception))))
342 exitWith (ExitFailure 1)
345 -- error messages propagated as exceptions
350 PhaseFailed _ code -> exitWith code
351 Interrupted -> exitWith (ExitFailure 1)
352 _ -> do fatalErrorMsg dflags (text (show ge))
353 exitWith (ExitFailure 1)
357 -- | Install a default cleanup handler to remove temporary files deposited by
358 -- a GHC run. This is seperate from 'defaultErrorHandler', because you might
359 -- want to override the error handling, but still get the ordinary cleanup
361 defaultCleanupHandler :: (ExceptionMonad m, MonadIO m) =>
362 DynFlags -> m a -> m a
363 defaultCleanupHandler dflags inner =
364 -- make sure we clean up after ourselves
367 cleanTempFiles dflags
370 -- exceptions will be blocked while we clean the temporary files,
371 -- so there shouldn't be any difficulty if we receive further
374 -- | Print the error message and all warnings. Useful inside exception
375 -- handlers. Clears warnings after printing.
376 printExceptionAndWarnings :: GhcMonad m => SourceError -> m ()
377 printExceptionAndWarnings err = do
378 let errs = srcErrorMessages err
380 dflags <- getSessionDynFlags
382 -- Empty errors means we failed due to -Werror. (Since this function
383 -- takes a source error as argument, we know for sure _some_ error
384 -- did indeed happen.)
386 printBagOfWarnings dflags warns
387 printBagOfErrors dflags (unitBag warnIsErrorMsg)
388 else liftIO $ printBagOfErrors dflags errs
391 -- | Print all accumulated warnings using 'log_action'.
392 printWarnings :: GhcMonad m => m ()
394 dflags <- getSessionDynFlags
396 liftIO $ printBagOfWarnings dflags warns
399 -- | Run function for the 'Ghc' monad.
401 -- It initialises the GHC session and warnings via 'initGhcMonad'. Each call
402 -- to this function will create a new session which should not be shared among
405 -- Any errors not handled inside the 'Ghc' action are propagated as IO
408 runGhc :: Maybe FilePath -- ^ See argument to 'initGhcMonad'.
409 -> Ghc a -- ^ The action to perform.
411 runGhc mb_top_dir ghc = do
412 wref <- newIORef emptyBag
413 ref <- newIORef undefined
414 let session = Session ref wref
415 flip unGhc session $ do
416 initGhcMonad mb_top_dir
418 -- XXX: unregister interrupt handlers here?
420 -- | Run function for 'GhcT' monad transformer.
422 -- It initialises the GHC session and warnings via 'initGhcMonad'. Each call
423 -- to this function will create a new session which should not be shared among
426 runGhcT :: (ExceptionMonad m, Functor m, MonadIO m) =>
427 Maybe FilePath -- ^ See argument to 'initGhcMonad'.
428 -> GhcT m a -- ^ The action to perform.
430 runGhcT mb_top_dir ghct = do
431 wref <- liftIO $ newIORef emptyBag
432 ref <- liftIO $ newIORef undefined
433 let session = Session ref wref
434 flip unGhcT session $ do
435 initGhcMonad mb_top_dir
438 -- | Initialise a GHC session.
440 -- If you implement a custom 'GhcMonad' you must call this function in the
441 -- monad run function. It will initialise the session variable and clear all
444 -- The first argument should point to the directory where GHC's library files
445 -- reside. More precisely, this should be the output of @ghc --print-libdir@
446 -- of the version of GHC the module using this API is compiled with. For
447 -- portability, you should use the @ghc-paths@ package, available at
448 -- <http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ghc-paths>.
450 initGhcMonad :: GhcMonad m => Maybe FilePath -> m ()
451 initGhcMonad mb_top_dir = do
453 main_thread <- liftIO $ myThreadId
454 liftIO $ modifyMVar_ interruptTargetThread (return . (main_thread :))
455 liftIO $ installSignalHandlers
457 liftIO $ StaticFlags.initStaticOpts
459 dflags0 <- liftIO $ initDynFlags defaultDynFlags
460 dflags <- liftIO $ initSysTools mb_top_dir dflags0
461 env <- liftIO $ newHscEnv dflags
465 -- -----------------------------------------------------------------------------
468 -- | Grabs the DynFlags from the Session
469 getSessionDynFlags :: GhcMonad m => m DynFlags
470 getSessionDynFlags = withSession (return . hsc_dflags)
472 -- | Updates the DynFlags in a Session. This also reads
473 -- the package database (unless it has already been read),
474 -- and prepares the compilers knowledge about packages. It
475 -- can be called again to load new packages: just add new
476 -- package flags to (packageFlags dflags).
478 -- Returns a list of new packages that may need to be linked in using
479 -- the dynamic linker (see 'linkPackages') as a result of new package
480 -- flags. If you are not doing linking or doing static linking, you
481 -- can ignore the list of packages returned.
483 setSessionDynFlags :: GhcMonad m => DynFlags -> m [PackageId]
484 setSessionDynFlags dflags = do
485 (dflags', preload) <- liftIO $ initPackages dflags
486 modifySession (\h -> h{ hsc_dflags = dflags' })
489 -- | If there is no -o option, guess the name of target executable
490 -- by using top-level source file name as a base.
491 guessOutputFile :: GhcMonad m => m ()
492 guessOutputFile = modifySession $ \env ->
493 let dflags = hsc_dflags env
494 mod_graph = hsc_mod_graph env
495 mainModuleSrcPath :: Maybe String
496 mainModuleSrcPath = do
497 let isMain = (== mainModIs dflags) . ms_mod
498 [ms] <- return (filter isMain mod_graph)
499 ml_hs_file (ms_location ms)
500 name = fmap dropExtension mainModuleSrcPath
502 #if defined(mingw32_HOST_OS)
503 -- we must add the .exe extention unconditionally here, otherwise
504 -- when name has an extension of its own, the .exe extension will
505 -- not be added by DriverPipeline.exeFileName. See #2248
506 name_exe = fmap (<.> "exe") name
511 case outputFile dflags of
513 Nothing -> env { hsc_dflags = dflags { outputFile = name_exe } }
515 -- -----------------------------------------------------------------------------
518 -- ToDo: think about relative vs. absolute file paths. And what
519 -- happens when the current directory changes.
521 -- | Sets the targets for this session. Each target may be a module name
522 -- or a filename. The targets correspond to the set of root modules for
523 -- the program\/library. Unloading the current program is achieved by
524 -- setting the current set of targets to be empty, followed by 'load'.
525 setTargets :: GhcMonad m => [Target] -> m ()
526 setTargets targets = modifySession (\h -> h{ hsc_targets = targets })
528 -- | Returns the current set of targets
529 getTargets :: GhcMonad m => m [Target]
530 getTargets = withSession (return . hsc_targets)
532 -- | Add another target.
533 addTarget :: GhcMonad m => Target -> m ()
535 = modifySession (\h -> h{ hsc_targets = target : hsc_targets h })
538 removeTarget :: GhcMonad m => TargetId -> m ()
539 removeTarget target_id
540 = modifySession (\h -> h{ hsc_targets = filter (hsc_targets h) })
542 filter targets = [ t | t@(Target id _ _) <- targets, id /= target_id ]
544 -- | Attempts to guess what Target a string refers to. This function
545 -- implements the @--make@/GHCi command-line syntax for filenames:
547 -- - if the string looks like a Haskell source filename, then interpret it
550 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
553 -- - otherwise interpret the string as a module name
555 guessTarget :: GhcMonad m => String -> Maybe Phase -> m Target
556 guessTarget str (Just phase)
557 = return (Target (TargetFile str (Just phase)) True Nothing)
558 guessTarget str Nothing
559 | isHaskellSrcFilename file
560 = return (target (TargetFile file Nothing))
562 = do exists <- liftIO $ doesFileExist hs_file
564 then return (target (TargetFile hs_file Nothing))
566 exists <- liftIO $ doesFileExist lhs_file
568 then return (target (TargetFile lhs_file Nothing))
570 if looksLikeModuleName file
571 then return (target (TargetModule (mkModuleName file)))
574 (ProgramError (showSDoc $
575 text "target" <+> quotes (text file) <+>
576 text "is not a module name or a source file"))
579 | '*':rest <- str = (rest, False)
580 | otherwise = (str, True)
582 hs_file = file <.> "hs"
583 lhs_file = file <.> "lhs"
585 target tid = Target tid obj_allowed Nothing
587 -- -----------------------------------------------------------------------------
588 -- Extending the program scope
590 extendGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
591 extendGlobalRdrScope rdrElts
592 = modifySession $ \hscEnv ->
593 let global_rdr = hsc_global_rdr_env hscEnv
594 in hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv global_rdr rdrElts }
596 setGlobalRdrScope :: GhcMonad m => [GlobalRdrElt] -> m ()
597 setGlobalRdrScope rdrElts
598 = modifySession $ \hscEnv ->
599 hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv emptyGlobalRdrEnv rdrElts }
601 extendGlobalTypeScope :: GhcMonad m => [Id] -> m ()
602 extendGlobalTypeScope ids
603 = modifySession $ \hscEnv ->
604 let global_type = hsc_global_type_env hscEnv
605 in hscEnv{ hsc_global_type_env = extendTypeEnvWithIds global_type ids }
607 setGlobalTypeScope :: GhcMonad m => [Id] -> m ()
608 setGlobalTypeScope ids
609 = modifySession $ \hscEnv ->
610 hscEnv{ hsc_global_type_env = extendTypeEnvWithIds emptyTypeEnv ids }
612 -- -----------------------------------------------------------------------------
613 -- Parsing Haddock comments
615 parseHaddockComment :: String -> Either String (HsDoc RdrName)
616 parseHaddockComment string =
617 case parseHaddockParagraphs (tokenise string) of
621 -- -----------------------------------------------------------------------------
622 -- Loading the program
624 -- | Perform a dependency analysis starting from the current targets
625 -- and update the session with the new module graph.
626 depanal :: GhcMonad m =>
627 [ModuleName] -- ^ excluded modules
628 -> Bool -- ^ allow duplicate roots
630 depanal excluded_mods allow_dup_roots = do
631 hsc_env <- getSession
633 dflags = hsc_dflags hsc_env
634 targets = hsc_targets hsc_env
635 old_graph = hsc_mod_graph hsc_env
637 liftIO $ showPass dflags "Chasing dependencies"
638 liftIO $ debugTraceMsg dflags 2 (hcat [
639 text "Chasing modules from: ",
640 hcat (punctuate comma (map pprTarget targets))])
642 mod_graph <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
643 modifySession $ \_ -> hsc_env { hsc_mod_graph = mod_graph }
648 | LoadUpTo ModuleName
649 | LoadDependenciesOf ModuleName
651 -- | Try to load the program. Calls 'loadWithLogger' with the default
652 -- compiler that just immediately logs all warnings and errors.
653 load :: GhcMonad m => LoadHowMuch -> m SuccessFlag
655 loadWithLogger defaultWarnErrLogger how_much
657 -- | A function called to log warnings and errors.
658 type WarnErrLogger = GhcMonad m => Maybe SourceError -> m ()
660 defaultWarnErrLogger :: WarnErrLogger
661 defaultWarnErrLogger Nothing = printWarnings
662 defaultWarnErrLogger (Just e) = printExceptionAndWarnings e
664 -- | Try to load the program. If a Module is supplied, then just
665 -- attempt to load up to this target. If no Module is supplied,
666 -- then try to load all targets.
668 -- The first argument is a function that is called after compiling each
669 -- module to print wanrings and errors.
671 loadWithLogger :: GhcMonad m => WarnErrLogger -> LoadHowMuch -> m SuccessFlag
672 loadWithLogger logger how_much = do
673 -- Dependency analysis first. Note that this fixes the module graph:
674 -- even if we don't get a fully successful upsweep, the full module
675 -- graph is still retained in the Session. We can tell which modules
676 -- were successfully loaded by inspecting the Session's HPT.
677 mod_graph <- depanal [] False
678 load2 how_much mod_graph logger
680 load2 :: GhcMonad m => LoadHowMuch -> [ModSummary] -> WarnErrLogger
682 load2 how_much mod_graph logger = do
684 hsc_env <- getSession
686 let hpt1 = hsc_HPT hsc_env
687 let dflags = hsc_dflags hsc_env
689 -- The "bad" boot modules are the ones for which we have
690 -- B.hs-boot in the module graph, but no B.hs
691 -- The downsweep should have ensured this does not happen
693 let all_home_mods = [ms_mod_name s
694 | s <- mod_graph, not (isBootSummary s)]
695 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
696 not (ms_mod_name s `elem` all_home_mods)]
697 ASSERT( null bad_boot_mods ) return ()
699 -- check that the module given in HowMuch actually exists, otherwise
700 -- topSortModuleGraph will bomb later.
701 let checkHowMuch (LoadUpTo m) = checkMod m
702 checkHowMuch (LoadDependenciesOf m) = checkMod m
706 | m `elem` all_home_mods = and_then
708 liftIO $ errorMsg dflags (text "no such module:" <+>
712 checkHowMuch how_much $ do
714 -- mg2_with_srcimps drops the hi-boot nodes, returning a
715 -- graph with cycles. Among other things, it is used for
716 -- backing out partially complete cycles following a failed
717 -- upsweep, and for removing from hpt all the modules
718 -- not in strict downwards closure, during calls to compile.
719 let mg2_with_srcimps :: [SCC ModSummary]
720 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
722 -- If we can determine that any of the {-# SOURCE #-} imports
723 -- are definitely unnecessary, then emit a warning.
724 warnUnnecessarySourceImports dflags mg2_with_srcimps
727 -- check the stability property for each module.
728 stable_mods@(stable_obj,stable_bco)
729 = checkStability hpt1 mg2_with_srcimps all_home_mods
731 -- prune bits of the HPT which are definitely redundant now,
733 pruned_hpt = pruneHomePackageTable hpt1
734 (flattenSCCs mg2_with_srcimps)
737 liftIO $ evaluate pruned_hpt
739 -- before we unload anything, make sure we don't leave an old
740 -- interactive context around pointing to dead bindings. Also,
741 -- write the pruned HPT to allow the old HPT to be GC'd.
742 modifySession $ \_ -> hsc_env{ hsc_IC = emptyInteractiveContext,
743 hsc_HPT = pruned_hpt }
745 liftIO $ debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
746 text "Stable BCO:" <+> ppr stable_bco)
748 -- Unload any modules which are going to be re-linked this time around.
749 let stable_linkables = [ linkable
750 | m <- stable_obj++stable_bco,
751 Just hmi <- [lookupUFM pruned_hpt m],
752 Just linkable <- [hm_linkable hmi] ]
753 liftIO $ unload hsc_env stable_linkables
755 -- We could at this point detect cycles which aren't broken by
756 -- a source-import, and complain immediately, but it seems better
757 -- to let upsweep_mods do this, so at least some useful work gets
758 -- done before the upsweep is abandoned.
759 --hPutStrLn stderr "after tsort:\n"
760 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
762 -- Now do the upsweep, calling compile for each module in
763 -- turn. Final result is version 3 of everything.
765 -- Topologically sort the module graph, this time including hi-boot
766 -- nodes, and possibly just including the portion of the graph
767 -- reachable from the module specified in the 2nd argument to load.
768 -- This graph should be cycle-free.
769 -- If we're restricting the upsweep to a portion of the graph, we
770 -- also want to retain everything that is still stable.
771 let full_mg :: [SCC ModSummary]
772 full_mg = topSortModuleGraph False mod_graph Nothing
774 maybe_top_mod = case how_much of
776 LoadDependenciesOf m -> Just m
779 partial_mg0 :: [SCC ModSummary]
780 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
782 -- LoadDependenciesOf m: we want the upsweep to stop just
783 -- short of the specified module (unless the specified module
786 | LoadDependenciesOf _mod <- how_much
787 = ASSERT( case last partial_mg0 of
788 AcyclicSCC ms -> ms_mod_name ms == _mod; _ -> False )
789 List.init partial_mg0
795 | AcyclicSCC ms <- full_mg,
796 ms_mod_name ms `elem` stable_obj++stable_bco,
797 ms_mod_name ms `notElem` [ ms_mod_name ms' |
798 AcyclicSCC ms' <- partial_mg ] ]
800 mg = stable_mg ++ partial_mg
802 -- clean up between compilations
803 let cleanup = cleanTempFilesExcept dflags
804 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
806 liftIO $ debugTraceMsg dflags 2 (hang (text "Ready for upsweep")
808 (upsweep_ok, hsc_env1, modsUpswept)
810 (hsc_env { hsc_HPT = emptyHomePackageTable })
811 pruned_hpt stable_mods cleanup mg
813 -- Make modsDone be the summaries for each home module now
814 -- available; this should equal the domain of hpt3.
815 -- Get in in a roughly top .. bottom order (hence reverse).
817 let modsDone = reverse modsUpswept
819 -- Try and do linking in some form, depending on whether the
820 -- upsweep was completely or only partially successful.
822 if succeeded upsweep_ok
825 -- Easy; just relink it all.
826 do liftIO $ debugTraceMsg dflags 2 (text "Upsweep completely successful.")
828 -- Clean up after ourselves
829 liftIO $ cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
831 -- Issue a warning for the confusing case where the user
832 -- said '-o foo' but we're not going to do any linking.
833 -- We attempt linking if either (a) one of the modules is
834 -- called Main, or (b) the user said -no-hs-main, indicating
835 -- that main() is going to come from somewhere else.
837 let ofile = outputFile dflags
838 let no_hs_main = dopt Opt_NoHsMain dflags
840 main_mod = mainModIs dflags
841 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
842 do_linking = a_root_is_Main || no_hs_main
844 when (ghcLink dflags == LinkBinary
845 && isJust ofile && not do_linking) $
846 liftIO $ debugTraceMsg dflags 1 $
847 text ("Warning: output was redirected with -o, " ++
848 "but no output will be generated\n" ++
849 "because there is no " ++
850 moduleNameString (moduleName main_mod) ++ " module.")
852 -- link everything together
853 linkresult <- liftIO $ link (ghcLink dflags) dflags do_linking (hsc_HPT hsc_env1)
855 loadFinish Succeeded linkresult hsc_env1
858 -- Tricky. We need to back out the effects of compiling any
859 -- half-done cycles, both so as to clean up the top level envs
860 -- and to avoid telling the interactive linker to link them.
861 do liftIO $ debugTraceMsg dflags 2 (text "Upsweep partially successful.")
864 = map ms_mod modsDone
865 let mods_to_zap_names
866 = findPartiallyCompletedCycles modsDone_names
869 = filter ((`notElem` mods_to_zap_names).ms_mod)
872 let hpt4 = retainInTopLevelEnvs (map ms_mod_name mods_to_keep)
875 -- Clean up after ourselves
876 liftIO $ cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
878 -- there should be no Nothings where linkables should be, now
879 ASSERT(all (isJust.hm_linkable)
880 (eltsUFM (hsc_HPT hsc_env))) do
882 -- Link everything together
883 linkresult <- liftIO $ link (ghcLink dflags) dflags False hpt4
885 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
886 loadFinish Failed linkresult hsc_env4
888 -- Finish up after a load.
890 -- If the link failed, unload everything and return.
891 loadFinish :: GhcMonad m =>
892 SuccessFlag -> SuccessFlag -> HscEnv
894 loadFinish _all_ok Failed hsc_env
895 = do liftIO $ unload hsc_env []
896 modifySession $ \_ -> discardProg hsc_env
899 -- Empty the interactive context and set the module context to the topmost
900 -- newly loaded module, or the Prelude if none were loaded.
901 loadFinish all_ok Succeeded hsc_env
902 = do modifySession $ \_ -> hsc_env{ hsc_IC = emptyInteractiveContext }
906 -- Forget the current program, but retain the persistent info in HscEnv
907 discardProg :: HscEnv -> HscEnv
909 = hsc_env { hsc_mod_graph = emptyMG,
910 hsc_IC = emptyInteractiveContext,
911 hsc_HPT = emptyHomePackageTable }
913 -- used to fish out the preprocess output files for the purposes of
914 -- cleaning up. The preprocessed file *might* be the same as the
915 -- source file, but that doesn't do any harm.
916 ppFilesFromSummaries :: [ModSummary] -> [FilePath]
917 ppFilesFromSummaries summaries = map ms_hspp_file summaries
919 -- -----------------------------------------------------------------------------
921 class ParsedMod m where
922 modSummary :: m -> ModSummary
923 parsedSource :: m -> ParsedSource
925 class ParsedMod m => TypecheckedMod m where
926 renamedSource :: m -> Maybe RenamedSource
927 typecheckedSource :: m -> TypecheckedSource
928 moduleInfo :: m -> ModuleInfo
929 tm_internals :: m -> (TcGblEnv, ModDetails)
930 -- ToDo: improvements that could be made here:
931 -- if the module succeeded renaming but not typechecking,
932 -- we can still get back the GlobalRdrEnv and exports, so
933 -- perhaps the ModuleInfo should be split up into separate
936 class TypecheckedMod m => DesugaredMod m where
937 coreModule :: m -> ModGuts
939 -- | The result of successful parsing.
941 ParsedModule { pm_mod_summary :: ModSummary
942 , pm_parsed_source :: ParsedSource }
944 instance ParsedMod ParsedModule where
945 modSummary m = pm_mod_summary m
946 parsedSource m = pm_parsed_source m
948 -- | The result of successful typechecking. It also contains the parser
950 data TypecheckedModule =
951 TypecheckedModule { tm_parsed_module :: ParsedModule
952 , tm_renamed_source :: Maybe RenamedSource
953 , tm_typechecked_source :: TypecheckedSource
954 , tm_checked_module_info :: ModuleInfo
955 , tm_internals_ :: (TcGblEnv, ModDetails)
958 instance ParsedMod TypecheckedModule where
959 modSummary m = modSummary (tm_parsed_module m)
960 parsedSource m = parsedSource (tm_parsed_module m)
962 instance TypecheckedMod TypecheckedModule where
963 renamedSource m = tm_renamed_source m
964 typecheckedSource m = tm_typechecked_source m
965 moduleInfo m = tm_checked_module_info m
966 tm_internals m = tm_internals_ m
968 -- | The result of successful desugaring (i.e., translation to core). Also
969 -- contains all the information of a typechecked module.
970 data DesugaredModule =
971 DesugaredModule { dm_typechecked_module :: TypecheckedModule
972 , dm_core_module :: ModGuts
975 instance ParsedMod DesugaredModule where
976 modSummary m = modSummary (dm_typechecked_module m)
977 parsedSource m = parsedSource (dm_typechecked_module m)
979 instance TypecheckedMod DesugaredModule where
980 renamedSource m = renamedSource (dm_typechecked_module m)
981 typecheckedSource m = typecheckedSource (dm_typechecked_module m)
982 moduleInfo m = moduleInfo (dm_typechecked_module m)
983 tm_internals m = tm_internals_ (dm_typechecked_module m)
985 instance DesugaredMod DesugaredModule where
986 coreModule m = dm_core_module m
988 type ParsedSource = Located (HsModule RdrName)
989 type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
990 Maybe (HsDoc Name), HaddockModInfo Name)
991 type TypecheckedSource = LHsBinds Id
994 -- - things that aren't in the output of the typechecker right now:
998 -- - type/data/newtype declarations
999 -- - class declarations
1001 -- - extra things in the typechecker's output:
1002 -- - default methods are turned into top-level decls.
1003 -- - dictionary bindings
1005 -- | Return the 'ModSummary' of a module with the given name.
1007 -- The module must be part of the module graph (see 'hsc_mod_graph' and
1008 -- 'ModuleGraph'). If this is not the case, this function will throw a
1011 -- This function ignores boot modules and requires that there is only one
1012 -- non-boot module with the given name.
1013 getModSummary :: GhcMonad m => ModuleName -> m ModSummary
1014 getModSummary mod = do
1015 mg <- liftM hsc_mod_graph getSession
1016 case [ ms | ms <- mg, ms_mod_name ms == mod, not (isBootSummary ms) ] of
1017 [] -> throw $ mkApiErr (text "Module not part of module graph")
1019 multiple -> throw $ mkApiErr (text "getModSummary is ambiguous: " <+> ppr multiple)
1021 -- | Parse a module.
1023 -- Throws a 'SourceError' on parse error.
1024 parseModule :: GhcMonad m => ModSummary -> m ParsedModule
1026 hsc_env0 <- getSession
1027 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1028 rdr_module <- parseFile hsc_env ms
1029 return (ParsedModule ms rdr_module)
1031 -- | Typecheck and rename a parsed module.
1033 -- Throws a 'SourceError' if either fails.
1034 typecheckModule :: GhcMonad m => ParsedModule -> m TypecheckedModule
1035 typecheckModule pmod = do
1036 let ms = modSummary pmod
1037 hsc_env0 <- getSession
1038 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1039 (tc_gbl_env, rn_info)
1040 <- typecheckRenameModule hsc_env ms (parsedSource pmod)
1041 details <- liftIO $ makeSimpleDetails hsc_env tc_gbl_env
1044 tm_internals_ = (tc_gbl_env, details),
1045 tm_parsed_module = pmod,
1046 tm_renamed_source = rn_info,
1047 tm_typechecked_source = tcg_binds tc_gbl_env,
1048 tm_checked_module_info =
1050 minf_type_env = md_types details,
1051 minf_exports = availsToNameSet $ md_exports details,
1052 minf_rdr_env = Just (tcg_rdr_env tc_gbl_env),
1053 minf_instances = md_insts details
1055 ,minf_modBreaks = emptyModBreaks
1059 -- | Desugar a typechecked module.
1060 desugarModule :: GhcMonad m => TypecheckedModule -> m DesugaredModule
1061 desugarModule tcm = do
1062 let ms = modSummary tcm
1063 hsc_env0 <- getSession
1064 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1065 let (tcg, _) = tm_internals tcm
1066 guts <- deSugarModule hsc_env ms tcg
1069 dm_typechecked_module = tcm,
1070 dm_core_module = guts
1073 -- | Load a module. Input doesn't need to be desugared.
1075 -- XXX: Describe usage.
1076 loadModule :: (TypecheckedMod mod, GhcMonad m) => mod -> m mod
1078 let ms = modSummary tcm
1079 let mod = ms_mod_name ms
1080 hsc_env0 <- getSession
1081 let hsc_env = hsc_env0 { hsc_dflags = ms_hspp_opts ms }
1082 let (tcg, details) = tm_internals tcm
1083 (iface,_) <- liftIO $ makeSimpleIface hsc_env Nothing tcg details
1084 let mod_info = HomeModInfo {
1086 hm_details = details,
1087 hm_linkable = Nothing }
1088 let hpt_new = addToUFM (hsc_HPT hsc_env) mod mod_info
1089 modifySession $ \_ -> hsc_env0{ hsc_HPT = hpt_new }
1092 -- | This is the way to get access to the Core bindings corresponding
1093 -- to a module. 'compileToCore' parses, typechecks, and
1094 -- desugars the module, then returns the resulting Core module (consisting of
1095 -- the module name, type declarations, and function declarations) if
1097 compileToCoreModule :: GhcMonad m => FilePath -> m CoreModule
1098 compileToCoreModule = compileCore False
1100 -- | Like compileToCoreModule, but invokes the simplifier, so
1101 -- as to return simplified and tidied Core.
1102 compileToCoreSimplified :: GhcMonad m => FilePath -> m CoreModule
1103 compileToCoreSimplified = compileCore True
1105 -- | Provided for backwards-compatibility: compileToCore returns just the Core
1106 -- bindings, but for most purposes, you probably want to call
1107 -- compileToCoreModule.
1108 compileToCore :: GhcMonad m => FilePath -> m [CoreBind]
1109 compileToCore fn = do
1110 mod <- compileToCoreModule session fn
1111 return $ cm_binds mod
1113 -- | Takes a CoreModule and compiles the bindings therein
1114 -- to object code. The first argument is a bool flag indicating
1115 -- whether to run the simplifier.
1116 -- The resulting .o, .hi, and executable files, if any, are stored in the
1117 -- current directory, and named according to the module name.
1118 -- Returns True iff compilation succeeded.
1119 -- This has only so far been tested with a single self-contained module.
1120 compileCoreToObj :: GhcMonad m => Bool -> CoreModule -> m ()
1121 compileCoreToObj simplify cm@(CoreModule{ cm_module = mName }) = do
1122 hscEnv <- getSession
1123 dflags <- getSessionDynFlags
1124 currentTime <- liftIO $ getClockTime
1125 cwd <- liftIO $ getCurrentDirectory
1126 modLocation <- liftIO $ mkHiOnlyModLocation dflags (hiSuf dflags) cwd
1127 ((moduleNameSlashes . moduleName) mName)
1129 let modSummary = ModSummary { ms_mod = mName,
1130 ms_hsc_src = ExtCoreFile,
1131 ms_location = modLocation,
1132 -- By setting the object file timestamp to Nothing,
1133 -- we always force recompilation, which is what we
1134 -- want. (Thus it doesn't matter what the timestamp
1135 -- for the (nonexistent) source file is.)
1136 ms_hs_date = currentTime,
1137 ms_obj_date = Nothing,
1138 -- Only handling the single-module case for now, so no imports.
1143 ms_hspp_opts = dflags,
1144 ms_hspp_buf = Nothing
1147 ioMsgMaybe $ flip evalComp (CompState{ compHscEnv=hscEnv,
1148 compModSummary=modSummary,
1149 compOldIface=Nothing}) $
1150 let maybe_simplify mod_guts | simplify = hscSimplify mod_guts
1151 | otherwise = return mod_guts
1152 in maybe_simplify (mkModGuts cm)
1158 -- Makes a "vanilla" ModGuts.
1159 mkModGuts :: CoreModule -> ModGuts
1160 mkModGuts coreModule = ModGuts {
1161 mg_module = cm_module coreModule,
1164 mg_deps = noDependencies,
1165 mg_dir_imps = emptyModuleEnv,
1166 mg_used_names = emptyNameSet,
1167 mg_rdr_env = emptyGlobalRdrEnv,
1168 mg_fix_env = emptyFixityEnv,
1169 mg_types = emptyTypeEnv,
1173 mg_binds = cm_binds coreModule,
1174 mg_foreign = NoStubs,
1175 mg_warns = NoWarnings,
1176 mg_hpc_info = emptyHpcInfo False,
1177 mg_modBreaks = emptyModBreaks,
1178 mg_vect_info = noVectInfo,
1179 mg_inst_env = emptyInstEnv,
1180 mg_fam_inst_env = emptyFamInstEnv
1183 compileCore :: GhcMonad m => Bool -> FilePath -> m CoreModule
1184 compileCore simplify fn = do
1185 -- First, set the target to the desired filename
1186 target <- guessTarget fn Nothing
1189 -- Then find dependencies
1190 modGraph <- depanal [] True
1191 case find ((== fn) . msHsFilePath) modGraph of
1192 Just modSummary -> do
1193 -- Now we have the module name;
1194 -- parse, typecheck and desugar the module
1195 mod_guts <- coreModule `fmap`
1196 (desugarModule =<< typecheckModule =<< parseModule modSummary)
1197 liftM gutsToCoreModule $
1200 -- If simplify is true: simplify (hscSimplify), then tidy
1202 hsc_env <- getSession
1203 simpl_guts <- ioMsg $ evalComp (hscSimplify mod_guts)
1205 compHscEnv = hsc_env,
1206 compModSummary = modSummary,
1207 compOldIface = Nothing})
1208 tidy_guts <- liftIO $ tidyProgram hsc_env simpl_guts
1209 return $ Left tidy_guts
1211 return $ Right mod_guts
1213 Nothing -> panic "compileToCoreModule: target FilePath not found in\
1214 module dependency graph"
1215 where -- two versions, based on whether we simplify (thus run tidyProgram,
1216 -- which returns a (CgGuts, ModDetails) pair, or not (in which case
1217 -- we just have a ModGuts.
1218 gutsToCoreModule :: Either (CgGuts, ModDetails) ModGuts -> CoreModule
1219 gutsToCoreModule (Left (cg, md)) = CoreModule {
1220 cm_module = cg_module cg, cm_types = md_types md,
1221 cm_imports = cg_dir_imps cg, cm_binds = cg_binds cg
1223 gutsToCoreModule (Right mg) = CoreModule {
1224 cm_module = mg_module mg, cm_types = mg_types mg,
1225 cm_imports = moduleEnvKeys (mg_dir_imps mg), cm_binds = mg_binds mg
1228 -- ---------------------------------------------------------------------------
1231 unload :: HscEnv -> [Linkable] -> IO ()
1232 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
1233 = case ghcLink (hsc_dflags hsc_env) of
1235 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
1237 LinkInMemory -> panic "unload: no interpreter"
1238 -- urgh. avoid warnings:
1239 hsc_env stable_linkables
1243 -- -----------------------------------------------------------------------------
1247 Stability tells us which modules definitely do not need to be recompiled.
1248 There are two main reasons for having stability:
1250 - avoid doing a complete upsweep of the module graph in GHCi when
1251 modules near the bottom of the tree have not changed.
1253 - to tell GHCi when it can load object code: we can only load object code
1254 for a module when we also load object code fo all of the imports of the
1255 module. So we need to know that we will definitely not be recompiling
1256 any of these modules, and we can use the object code.
1258 The stability check is as follows. Both stableObject and
1259 stableBCO are used during the upsweep phase later.
1262 stable m = stableObject m || stableBCO m
1265 all stableObject (imports m)
1266 && old linkable does not exist, or is == on-disk .o
1267 && date(on-disk .o) > date(.hs)
1270 all stable (imports m)
1271 && date(BCO) > date(.hs)
1274 These properties embody the following ideas:
1276 - if a module is stable, then:
1278 - if it has been compiled in a previous pass (present in HPT)
1279 then it does not need to be compiled or re-linked.
1281 - if it has not been compiled in a previous pass,
1282 then we only need to read its .hi file from disk and
1283 link it to produce a 'ModDetails'.
1285 - if a modules is not stable, we will definitely be at least
1286 re-linking, and possibly re-compiling it during the 'upsweep'.
1287 All non-stable modules can (and should) therefore be unlinked
1288 before the 'upsweep'.
1290 - Note that objects are only considered stable if they only depend
1291 on other objects. We can't link object code against byte code.
1295 :: HomePackageTable -- HPT from last compilation
1296 -> [SCC ModSummary] -- current module graph (cyclic)
1297 -> [ModuleName] -- all home modules
1298 -> ([ModuleName], -- stableObject
1299 [ModuleName]) -- stableBCO
1301 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
1303 checkSCC (stable_obj, stable_bco) scc0
1304 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
1305 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
1306 | otherwise = (stable_obj, stable_bco)
1308 scc = flattenSCC scc0
1309 scc_mods = map ms_mod_name scc
1310 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
1312 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
1313 -- all imports outside the current SCC, but in the home pkg
1315 stable_obj_imps = map (`elem` stable_obj) scc_allimps
1316 stable_bco_imps = map (`elem` stable_bco) scc_allimps
1320 && all object_ok scc
1323 and (zipWith (||) stable_obj_imps stable_bco_imps)
1327 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
1331 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
1332 Just hmi | Just l <- hm_linkable hmi
1333 -> isObjectLinkable l && t == linkableTime l
1335 -- why '>=' rather than '>' above? If the filesystem stores
1336 -- times to the nearset second, we may occasionally find that
1337 -- the object & source have the same modification time,
1338 -- especially if the source was automatically generated
1339 -- and compiled. Using >= is slightly unsafe, but it matches
1340 -- make's behaviour.
1343 = case lookupUFM hpt (ms_mod_name ms) of
1344 Just hmi | Just l <- hm_linkable hmi ->
1345 not (isObjectLinkable l) &&
1346 linkableTime l >= ms_hs_date ms
1349 ms_allimps :: ModSummary -> [ModuleName]
1350 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
1352 -- -----------------------------------------------------------------------------
1354 -- | Prune the HomePackageTable
1356 -- Before doing an upsweep, we can throw away:
1358 -- - For non-stable modules:
1359 -- - all ModDetails, all linked code
1360 -- - all unlinked code that is out of date with respect to
1363 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
1364 -- space at the end of the upsweep, because the topmost ModDetails of the
1365 -- old HPT holds on to the entire type environment from the previous
1368 pruneHomePackageTable
1371 -> ([ModuleName],[ModuleName])
1374 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
1377 | is_stable modl = hmi'
1378 | otherwise = hmi'{ hm_details = emptyModDetails }
1380 modl = moduleName (mi_module (hm_iface hmi))
1381 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
1382 = hmi{ hm_linkable = Nothing }
1385 where ms = expectJust "prune" (lookupUFM ms_map modl)
1387 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
1389 is_stable m = m `elem` stable_obj || m `elem` stable_bco
1391 -- -----------------------------------------------------------------------------
1393 -- Return (names of) all those in modsDone who are part of a cycle
1394 -- as defined by theGraph.
1395 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1396 findPartiallyCompletedCycles modsDone theGraph
1400 chew ((AcyclicSCC _):rest) = chew rest -- acyclic? not interesting.
1401 chew ((CyclicSCC vs):rest)
1402 = let names_in_this_cycle = nub (map ms_mod vs)
1404 = nub ([done | done <- modsDone,
1405 done `elem` names_in_this_cycle])
1406 chewed_rest = chew rest
1408 if notNull mods_in_this_cycle
1409 && length mods_in_this_cycle < length names_in_this_cycle
1410 then mods_in_this_cycle ++ chewed_rest
1413 -- -----------------------------------------------------------------------------
1417 -- This is where we compile each module in the module graph, in a pass
1418 -- from the bottom to the top of the graph.
1420 -- There better had not be any cyclic groups here -- we check for them.
1424 WarnErrLogger -- ^ Called to print warnings and errors.
1425 -> HscEnv -- ^ Includes initially-empty HPT
1426 -> HomePackageTable -- ^ HPT from last time round (pruned)
1427 -> ([ModuleName],[ModuleName]) -- ^ stable modules (see checkStability)
1428 -> IO () -- ^ How to clean up unwanted tmp files
1429 -> [SCC ModSummary] -- ^ Mods to do (the worklist)
1431 HscEnv, -- With an updated HPT
1432 [ModSummary]) -- Mods which succeeded
1434 upsweep logger hsc_env old_hpt stable_mods cleanup sccs = do
1435 (res, hsc_env, done) <- upsweep' hsc_env old_hpt [] sccs 1 (length sccs)
1436 return (res, hsc_env, reverse done)
1439 upsweep' hsc_env _old_hpt done
1441 = return (Succeeded, hsc_env, done)
1443 upsweep' hsc_env _old_hpt done
1444 (CyclicSCC ms:_) _ _
1445 = do liftIO $ fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1446 return (Failed, hsc_env, done)
1448 upsweep' hsc_env old_hpt done
1449 (AcyclicSCC mod:mods) mod_index nmods
1450 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1451 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1452 -- (moduleEnvElts (hsc_HPT hsc_env)))
1455 <- handleSourceError
1456 (\err -> do logger (Just err); return Nothing) $ do
1457 mod_info <- upsweep_mod hsc_env old_hpt stable_mods
1459 logger Nothing -- log warnings
1460 return (Just mod_info)
1462 liftIO cleanup -- Remove unwanted tmp files between compilations
1465 Nothing -> return (Failed, hsc_env, done)
1467 let this_mod = ms_mod_name mod
1469 -- Add new info to hsc_env
1470 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1471 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1473 -- Space-saving: delete the old HPT entry
1474 -- for mod BUT if mod is a hs-boot
1475 -- node, don't delete it. For the
1476 -- interface, the HPT entry is probaby for the
1477 -- main Haskell source file. Deleting it
1478 -- would force the real module to be recompiled
1480 old_hpt1 | isBootSummary mod = old_hpt
1481 | otherwise = delFromUFM old_hpt this_mod
1485 -- fixup our HomePackageTable after we've finished compiling
1486 -- a mutually-recursive loop. See reTypecheckLoop, below.
1487 hsc_env2 <- liftIO $ reTypecheckLoop hsc_env1 mod done'
1489 upsweep' hsc_env2 old_hpt1 done' mods (mod_index+1) nmods
1491 -- | Compile a single module. Always produce a Linkable for it if
1492 -- successful. If no compilation happened, return the old Linkable.
1493 upsweep_mod :: GhcMonad m =>
1496 -> ([ModuleName],[ModuleName])
1498 -> Int -- index of module
1499 -> Int -- total number of modules
1502 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1504 this_mod_name = ms_mod_name summary
1505 this_mod = ms_mod summary
1506 mb_obj_date = ms_obj_date summary
1507 obj_fn = ml_obj_file (ms_location summary)
1508 hs_date = ms_hs_date summary
1510 is_stable_obj = this_mod_name `elem` stable_obj
1511 is_stable_bco = this_mod_name `elem` stable_bco
1513 old_hmi = lookupUFM old_hpt this_mod_name
1515 -- We're using the dflags for this module now, obtained by
1516 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1517 dflags = ms_hspp_opts summary
1518 prevailing_target = hscTarget (hsc_dflags hsc_env)
1519 local_target = hscTarget dflags
1521 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1522 -- we don't do anything dodgy: these should only work to change
1523 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1524 -- end up trying to link object code to byte code.
1525 target = if prevailing_target /= local_target
1526 && (not (isObjectTarget prevailing_target)
1527 || not (isObjectTarget local_target))
1528 then prevailing_target
1531 -- store the corrected hscTarget into the summary
1532 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1534 -- The old interface is ok if
1535 -- a) we're compiling a source file, and the old HPT
1536 -- entry is for a source file
1537 -- b) we're compiling a hs-boot file
1538 -- Case (b) allows an hs-boot file to get the interface of its
1539 -- real source file on the second iteration of the compilation
1540 -- manager, but that does no harm. Otherwise the hs-boot file
1541 -- will always be recompiled
1546 Just hm_info | isBootSummary summary -> Just iface
1547 | not (mi_boot iface) -> Just iface
1548 | otherwise -> Nothing
1550 iface = hm_iface hm_info
1552 compile_it :: GhcMonad m => Maybe Linkable -> m HomeModInfo
1553 compile_it = compile hsc_env summary' mod_index nmods mb_old_iface
1555 compile_it_discard_iface :: GhcMonad m =>
1556 Maybe Linkable -> m HomeModInfo
1557 compile_it_discard_iface
1558 = compile hsc_env summary' mod_index nmods Nothing
1564 -- Regardless of whether we're generating object code or
1565 -- byte code, we can always use an existing object file
1566 -- if it is *stable* (see checkStability).
1567 | is_stable_obj, isJust old_hmi ->
1568 let Just hmi = old_hmi in
1570 -- object is stable, and we have an entry in the
1571 -- old HPT: nothing to do
1573 | is_stable_obj, isNothing old_hmi -> do
1574 linkable <- liftIO $ findObjectLinkable this_mod obj_fn
1575 (expectJust "upsweep1" mb_obj_date)
1576 compile_it (Just linkable)
1577 -- object is stable, but we need to load the interface
1578 -- off disk to make a HMI.
1582 ASSERT(isJust old_hmi) -- must be in the old_hpt
1583 let Just hmi = old_hmi in
1585 -- BCO is stable: nothing to do
1587 | Just hmi <- old_hmi,
1588 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1589 linkableTime l >= ms_hs_date summary ->
1591 -- we have an old BCO that is up to date with respect
1592 -- to the source: do a recompilation check as normal.
1596 -- no existing code at all: we must recompile.
1598 -- When generating object code, if there's an up-to-date
1599 -- object file on the disk, then we can use it.
1600 -- However, if the object file is new (compared to any
1601 -- linkable we had from a previous compilation), then we
1602 -- must discard any in-memory interface, because this
1603 -- means the user has compiled the source file
1604 -- separately and generated a new interface, that we must
1605 -- read from the disk.
1607 obj | isObjectTarget obj,
1608 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1611 | Just l <- hm_linkable hmi,
1612 isObjectLinkable l && linkableTime l == obj_date
1613 -> compile_it (Just l)
1615 linkable <- liftIO $ findObjectLinkable this_mod obj_fn obj_date
1616 compile_it_discard_iface (Just linkable)
1623 -- Filter modules in the HPT
1624 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1625 retainInTopLevelEnvs keep_these hpt
1626 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1628 , let mb_mod_info = lookupUFM hpt mod
1629 , isJust mb_mod_info ]
1631 -- ---------------------------------------------------------------------------
1632 -- Typecheck module loops
1635 See bug #930. This code fixes a long-standing bug in --make. The
1636 problem is that when compiling the modules *inside* a loop, a data
1637 type that is only defined at the top of the loop looks opaque; but
1638 after the loop is done, the structure of the data type becomes
1641 The difficulty is then that two different bits of code have
1642 different notions of what the data type looks like.
1644 The idea is that after we compile a module which also has an .hs-boot
1645 file, we re-generate the ModDetails for each of the modules that
1646 depends on the .hs-boot file, so that everyone points to the proper
1647 TyCons, Ids etc. defined by the real module, not the boot module.
1648 Fortunately re-generating a ModDetails from a ModIface is easy: the
1649 function TcIface.typecheckIface does exactly that.
1651 Picking the modules to re-typecheck is slightly tricky. Starting from
1652 the module graph consisting of the modules that have already been
1653 compiled, we reverse the edges (so they point from the imported module
1654 to the importing module), and depth-first-search from the .hs-boot
1655 node. This gives us all the modules that depend transitively on the
1656 .hs-boot module, and those are exactly the modules that we need to
1659 Following this fix, GHC can compile itself with --make -O2.
1662 reTypecheckLoop :: HscEnv -> ModSummary -> ModuleGraph -> IO HscEnv
1663 reTypecheckLoop hsc_env ms graph
1664 | not (isBootSummary ms) &&
1665 any (\m -> ms_mod m == this_mod && isBootSummary m) graph
1667 let mss = reachableBackwards (ms_mod_name ms) graph
1668 non_boot = filter (not.isBootSummary) mss
1669 debugTraceMsg (hsc_dflags hsc_env) 2 $
1670 text "Re-typechecking loop: " <> ppr (map ms_mod_name non_boot)
1671 typecheckLoop hsc_env (map ms_mod_name non_boot)
1675 this_mod = ms_mod ms
1677 typecheckLoop :: HscEnv -> [ModuleName] -> IO HscEnv
1678 typecheckLoop hsc_env mods = do
1680 fixIO $ \new_hpt -> do
1681 let new_hsc_env = hsc_env{ hsc_HPT = new_hpt }
1682 mds <- initIfaceCheck new_hsc_env $
1683 mapM (typecheckIface . hm_iface) hmis
1684 let new_hpt = addListToUFM old_hpt
1685 (zip mods [ hmi{ hm_details = details }
1686 | (hmi,details) <- zip hmis mds ])
1688 return hsc_env{ hsc_HPT = new_hpt }
1690 old_hpt = hsc_HPT hsc_env
1691 hmis = map (expectJust "typecheckLoop" . lookupUFM old_hpt) mods
1693 reachableBackwards :: ModuleName -> [ModSummary] -> [ModSummary]
1694 reachableBackwards mod summaries
1695 = [ ms | (ms,_,_) <- reachableG (transposeG graph) root ]
1696 where -- the rest just sets up the graph:
1697 (graph, lookup_node) = moduleGraphNodes False summaries
1698 root = expectJust "reachableBackwards" (lookup_node HsBootFile mod)
1700 -- ---------------------------------------------------------------------------
1701 -- Topological sort of the module graph
1703 type SummaryNode = (ModSummary, Int, [Int])
1706 :: Bool -- Drop hi-boot nodes? (see below)
1710 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1711 -- The resulting list of strongly-connected-components is in topologically
1712 -- sorted order, starting with the module(s) at the bottom of the
1713 -- dependency graph (ie compile them first) and ending with the ones at
1716 -- Drop hi-boot nodes (first boolean arg)?
1718 -- False: treat the hi-boot summaries as nodes of the graph,
1719 -- so the graph must be acyclic
1721 -- True: eliminate the hi-boot nodes, and instead pretend
1722 -- the a source-import of Foo is an import of Foo
1723 -- The resulting graph has no hi-boot nodes, but can be cyclic
1725 topSortModuleGraph drop_hs_boot_nodes summaries mb_root_mod
1726 = map (fmap summaryNodeSummary) $ stronglyConnCompG initial_graph
1728 (graph, lookup_node) = moduleGraphNodes drop_hs_boot_nodes summaries
1730 initial_graph = case mb_root_mod of
1733 -- restrict the graph to just those modules reachable from
1734 -- the specified module. We do this by building a graph with
1735 -- the full set of nodes, and determining the reachable set from
1736 -- the specified node.
1737 let root | Just node <- lookup_node HsSrcFile root_mod, graph `hasVertexG` node = node
1738 | otherwise = ghcError (ProgramError "module does not exist")
1739 in graphFromEdgedVertices (seq root (reachableG graph root))
1741 summaryNodeKey :: SummaryNode -> Int
1742 summaryNodeKey (_, k, _) = k
1744 summaryNodeSummary :: SummaryNode -> ModSummary
1745 summaryNodeSummary (s, _, _) = s
1747 moduleGraphNodes :: Bool -> [ModSummary]
1748 -> (Graph SummaryNode, HscSource -> ModuleName -> Maybe SummaryNode)
1749 moduleGraphNodes drop_hs_boot_nodes summaries = (graphFromEdgedVertices nodes, lookup_node)
1751 numbered_summaries = zip summaries [1..]
1753 lookup_node :: HscSource -> ModuleName -> Maybe SummaryNode
1754 lookup_node hs_src mod = lookupFM node_map (mod, hs_src)
1756 lookup_key :: HscSource -> ModuleName -> Maybe Int
1757 lookup_key hs_src mod = fmap summaryNodeKey (lookup_node hs_src mod)
1759 node_map :: NodeMap SummaryNode
1760 node_map = listToFM [ ((moduleName (ms_mod s), ms_hsc_src s), node)
1761 | node@(s, _, _) <- nodes ]
1763 -- We use integers as the keys for the SCC algorithm
1764 nodes :: [SummaryNode]
1765 nodes = [ (s, key, out_keys)
1766 | (s, key) <- numbered_summaries
1767 -- Drop the hi-boot ones if told to do so
1768 , not (isBootSummary s && drop_hs_boot_nodes)
1769 , let out_keys = out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1770 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1771 (-- see [boot-edges] below
1772 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1774 else case lookup_key HsBootFile (ms_mod_name s) of
1778 -- [boot-edges] if this is a .hs and there is an equivalent
1779 -- .hs-boot, add a link from the former to the latter. This
1780 -- has the effect of detecting bogus cases where the .hs-boot
1781 -- depends on the .hs, by introducing a cycle. Additionally,
1782 -- it ensures that we will always process the .hs-boot before
1783 -- the .hs, and so the HomePackageTable will always have the
1784 -- most up to date information.
1786 -- Drop hs-boot nodes by using HsSrcFile as the key
1787 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1788 | otherwise = HsBootFile
1790 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1791 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1792 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1793 -- the IsBootInterface parameter True; else False
1796 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1797 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1799 msKey :: ModSummary -> NodeKey
1800 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1802 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1803 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1805 nodeMapElts :: NodeMap a -> [a]
1806 nodeMapElts = eltsFM
1808 -- | If there are {-# SOURCE #-} imports between strongly connected
1809 -- components in the topological sort, then those imports can
1810 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1811 -- were necessary, then the edge would be part of a cycle.
1812 warnUnnecessarySourceImports :: GhcMonad m => DynFlags -> [SCC ModSummary] -> m ()
1813 warnUnnecessarySourceImports dflags sccs =
1814 liftIO $ printBagOfWarnings dflags (listToBag (concatMap (check.flattenSCC) sccs))
1816 let mods_in_this_cycle = map ms_mod_name ms in
1817 [ warn i | m <- ms, i <- ms_srcimps m,
1818 unLoc i `notElem` mods_in_this_cycle ]
1820 warn :: Located ModuleName -> WarnMsg
1823 (ptext (sLit "Warning: {-# SOURCE #-} unnecessary in import of ")
1824 <+> quotes (ppr mod))
1826 -----------------------------------------------------------------------------
1827 -- Downsweep (dependency analysis)
1829 -- Chase downwards from the specified root set, returning summaries
1830 -- for all home modules encountered. Only follow source-import
1833 -- We pass in the previous collection of summaries, which is used as a
1834 -- cache to avoid recalculating a module summary if the source is
1837 -- The returned list of [ModSummary] nodes has one node for each home-package
1838 -- module, plus one for any hs-boot files. The imports of these nodes
1839 -- are all there, including the imports of non-home-package modules.
1841 downsweep :: GhcMonad m =>
1843 -> [ModSummary] -- Old summaries
1844 -> [ModuleName] -- Ignore dependencies on these; treat
1845 -- them as if they were package modules
1846 -> Bool -- True <=> allow multiple targets to have
1847 -- the same module name; this is
1848 -- very useful for ghc -M
1850 -- The elts of [ModSummary] all have distinct
1851 -- (Modules, IsBoot) identifiers, unless the Bool is true
1852 -- in which case there can be repeats
1853 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1854 = do -- catch error messages and return them
1855 --handleErrMsg -- should be covered by GhcMonad now
1856 -- (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1857 rootSummaries <- mapM getRootSummary roots
1858 let root_map = mkRootMap rootSummaries
1859 checkDuplicates root_map
1860 summs <- loop (concatMap msDeps rootSummaries) root_map
1863 roots = hsc_targets hsc_env
1865 old_summary_map :: NodeMap ModSummary
1866 old_summary_map = mkNodeMap old_summaries
1868 getRootSummary :: GhcMonad m => Target -> m ModSummary
1869 getRootSummary (Target (TargetFile file mb_phase) obj_allowed maybe_buf)
1870 = do exists <- liftIO $ doesFileExist file
1872 then summariseFile hsc_env old_summaries file mb_phase
1873 obj_allowed maybe_buf
1874 else throwOneError $ mkPlainErrMsg noSrcSpan $
1875 text "can't find file:" <+> text file
1876 getRootSummary (Target (TargetModule modl) obj_allowed maybe_buf)
1877 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1878 (L rootLoc modl) obj_allowed
1880 case maybe_summary of
1881 Nothing -> packageModErr modl
1884 rootLoc = mkGeneralSrcSpan (fsLit "<command line>")
1886 -- In a root module, the filename is allowed to diverge from the module
1887 -- name, so we have to check that there aren't multiple root files
1888 -- defining the same module (otherwise the duplicates will be silently
1889 -- ignored, leading to confusing behaviour).
1890 checkDuplicates :: GhcMonad m => NodeMap [ModSummary] -> m ()
1891 checkDuplicates root_map
1892 | allow_dup_roots = return ()
1893 | null dup_roots = return ()
1894 | otherwise = liftIO $ multiRootsErr (head dup_roots)
1896 dup_roots :: [[ModSummary]] -- Each at least of length 2
1897 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1899 loop :: GhcMonad m =>
1900 [(Located ModuleName,IsBootInterface)]
1901 -- Work list: process these modules
1902 -> NodeMap [ModSummary]
1903 -- Visited set; the range is a list because
1904 -- the roots can have the same module names
1905 -- if allow_dup_roots is True
1907 -- The result includes the worklist, except
1908 -- for those mentioned in the visited set
1909 loop [] done = return (concat (nodeMapElts done))
1910 loop ((wanted_mod, is_boot) : ss) done
1911 | Just summs <- lookupFM done key
1912 = if isSingleton summs then
1915 do { liftIO $ multiRootsErr summs; return [] }
1917 = do mb_s <- summariseModule hsc_env old_summary_map
1918 is_boot wanted_mod True
1921 Nothing -> loop ss done
1922 Just s -> loop (msDeps s ++ ss) (addToFM done key [s])
1924 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1926 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1927 mkRootMap summaries = addListToFM_C (++) emptyFM
1928 [ (msKey s, [s]) | s <- summaries ]
1930 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1931 -- (msDeps s) returns the dependencies of the ModSummary s.
1932 -- A wrinkle is that for a {-# SOURCE #-} import we return
1933 -- *both* the hs-boot file
1934 -- *and* the source file
1935 -- as "dependencies". That ensures that the list of all relevant
1936 -- modules always contains B.hs if it contains B.hs-boot.
1937 -- Remember, this pass isn't doing the topological sort. It's
1938 -- just gathering the list of all relevant ModSummaries
1940 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1941 ++ [ (m,False) | m <- ms_imps s ]
1943 -----------------------------------------------------------------------------
1944 -- Summarising modules
1946 -- We have two types of summarisation:
1948 -- * Summarise a file. This is used for the root module(s) passed to
1949 -- cmLoadModules. The file is read, and used to determine the root
1950 -- module name. The module name may differ from the filename.
1952 -- * Summarise a module. We are given a module name, and must provide
1953 -- a summary. The finder is used to locate the file in which the module
1959 -> [ModSummary] -- old summaries
1960 -> FilePath -- source file name
1961 -> Maybe Phase -- start phase
1962 -> Bool -- object code allowed?
1963 -> Maybe (StringBuffer,ClockTime)
1966 summariseFile hsc_env old_summaries file mb_phase obj_allowed maybe_buf
1967 -- we can use a cached summary if one is available and the
1968 -- source file hasn't changed, But we have to look up the summary
1969 -- by source file, rather than module name as we do in summarise.
1970 | Just old_summary <- findSummaryBySourceFile old_summaries file
1972 let location = ms_location old_summary
1974 -- return the cached summary if the source didn't change
1975 src_timestamp <- case maybe_buf of
1976 Just (_,t) -> return t
1977 Nothing -> liftIO $ getModificationTime file
1978 -- The file exists; we checked in getRootSummary above.
1979 -- If it gets removed subsequently, then this
1980 -- getModificationTime may fail, but that's the right
1983 if ms_hs_date old_summary == src_timestamp
1984 then do -- update the object-file timestamp
1986 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
1987 || obj_allowed -- bug #1205
1988 then liftIO $ getObjTimestamp location False
1990 return old_summary{ ms_obj_date = obj_timestamp }
1998 let dflags = hsc_dflags hsc_env
2000 (dflags', hspp_fn, buf)
2001 <- preprocessFile hsc_env file mb_phase maybe_buf
2003 (srcimps,the_imps, L _ mod_name) <- liftIO $ getImports dflags' buf hspp_fn file
2005 -- Make a ModLocation for this file
2006 location <- liftIO $ mkHomeModLocation dflags mod_name file
2008 -- Tell the Finder cache where it is, so that subsequent calls
2009 -- to findModule will find it, even if it's not on any search path
2010 mod <- liftIO $ addHomeModuleToFinder hsc_env mod_name location
2012 src_timestamp <- case maybe_buf of
2013 Just (_,t) -> return t
2014 Nothing -> liftIO $ getModificationTime file
2015 -- getMofificationTime may fail
2017 -- when the user asks to load a source file by name, we only
2018 -- use an object file if -fobject-code is on. See #1205.
2020 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
2021 || obj_allowed -- bug #1205
2022 then liftIO $ modificationTimeIfExists (ml_obj_file location)
2025 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
2026 ms_location = location,
2027 ms_hspp_file = hspp_fn,
2028 ms_hspp_opts = dflags',
2029 ms_hspp_buf = Just buf,
2030 ms_srcimps = srcimps, ms_imps = the_imps,
2031 ms_hs_date = src_timestamp,
2032 ms_obj_date = obj_timestamp })
2034 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
2035 findSummaryBySourceFile summaries file
2036 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
2037 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
2041 -- Summarise a module, and pick up source and timestamp.
2045 -> NodeMap ModSummary -- Map of old summaries
2046 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
2047 -> Located ModuleName -- Imported module to be summarised
2048 -> Bool -- object code allowed?
2049 -> Maybe (StringBuffer, ClockTime)
2050 -> [ModuleName] -- Modules to exclude
2051 -> m (Maybe ModSummary) -- Its new summary
2053 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod)
2054 obj_allowed maybe_buf excl_mods
2055 | wanted_mod `elem` excl_mods
2058 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
2059 = do -- Find its new timestamp; all the
2060 -- ModSummaries in the old map have valid ml_hs_files
2061 let location = ms_location old_summary
2062 src_fn = expectJust "summariseModule" (ml_hs_file location)
2064 -- check the modification time on the source file, and
2065 -- return the cached summary if it hasn't changed. If the
2066 -- file has disappeared, we need to call the Finder again.
2068 Just (_,t) -> check_timestamp old_summary location src_fn t
2070 m <- liftIO $ System.IO.Error.try (getModificationTime src_fn)
2072 Right t -> check_timestamp old_summary location src_fn t
2073 Left e | isDoesNotExistError e -> find_it
2074 | otherwise -> liftIO $ ioError e
2076 | otherwise = find_it
2078 dflags = hsc_dflags hsc_env
2080 hsc_src = if is_boot then HsBootFile else HsSrcFile
2082 check_timestamp old_summary location src_fn src_timestamp
2083 | ms_hs_date old_summary == src_timestamp = do
2084 -- update the object-file timestamp
2085 obj_timestamp <- liftIO $
2086 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
2087 || obj_allowed -- bug #1205
2088 then getObjTimestamp location is_boot
2090 return (Just old_summary{ ms_obj_date = obj_timestamp })
2092 -- source changed: re-summarise.
2093 new_summary location (ms_mod old_summary) src_fn src_timestamp
2096 -- Don't use the Finder's cache this time. If the module was
2097 -- previously a package module, it may have now appeared on the
2098 -- search path, so we want to consider it to be a home module. If
2099 -- the module was previously a home module, it may have moved.
2100 liftIO $ uncacheModule hsc_env wanted_mod
2101 found <- liftIO $ findImportedModule hsc_env wanted_mod Nothing
2104 | isJust (ml_hs_file location) ->
2106 just_found location mod
2108 -- Drop external-pkg
2109 ASSERT(modulePackageId mod /= thisPackage dflags)
2112 err -> liftIO $ noModError dflags loc wanted_mod err
2115 just_found location mod = do
2116 -- Adjust location to point to the hs-boot source file,
2117 -- hi file, object file, when is_boot says so
2118 let location' | is_boot = addBootSuffixLocn location
2119 | otherwise = location
2120 src_fn = expectJust "summarise2" (ml_hs_file location')
2122 -- Check that it exists
2123 -- It might have been deleted since the Finder last found it
2124 maybe_t <- liftIO $ modificationTimeIfExists src_fn
2126 Nothing -> noHsFileErr loc src_fn
2127 Just t -> new_summary location' mod src_fn t
2130 new_summary location mod src_fn src_timestamp
2132 -- Preprocess the source file and get its imports
2133 -- The dflags' contains the OPTIONS pragmas
2134 (dflags', hspp_fn, buf) <- preprocessFile hsc_env src_fn Nothing maybe_buf
2135 (srcimps, the_imps, L mod_loc mod_name) <- liftIO $ getImports dflags' buf hspp_fn src_fn
2137 when (mod_name /= wanted_mod) $
2138 throwOneError $ mkPlainErrMsg mod_loc $
2139 text "File name does not match module name:"
2140 $$ text "Saw:" <+> quotes (ppr mod_name)
2141 $$ text "Expected:" <+> quotes (ppr wanted_mod)
2143 -- Find the object timestamp, and return the summary
2144 obj_timestamp <- liftIO $
2145 if isObjectTarget (hscTarget (hsc_dflags hsc_env))
2146 || obj_allowed -- bug #1205
2147 then getObjTimestamp location is_boot
2150 return (Just (ModSummary { ms_mod = mod,
2151 ms_hsc_src = hsc_src,
2152 ms_location = location,
2153 ms_hspp_file = hspp_fn,
2154 ms_hspp_opts = dflags',
2155 ms_hspp_buf = Just buf,
2156 ms_srcimps = srcimps,
2158 ms_hs_date = src_timestamp,
2159 ms_obj_date = obj_timestamp }))
2162 getObjTimestamp :: ModLocation -> Bool -> IO (Maybe ClockTime)
2163 getObjTimestamp location is_boot
2164 = if is_boot then return Nothing
2165 else modificationTimeIfExists (ml_obj_file location)
2168 preprocessFile :: GhcMonad m =>
2171 -> Maybe Phase -- ^ Starting phase
2172 -> Maybe (StringBuffer,ClockTime)
2173 -> m (DynFlags, FilePath, StringBuffer)
2174 preprocessFile hsc_env src_fn mb_phase Nothing
2176 (dflags', hspp_fn) <- preprocess hsc_env (src_fn, mb_phase)
2177 buf <- liftIO $ hGetStringBuffer hspp_fn
2178 return (dflags', hspp_fn, buf)
2180 preprocessFile hsc_env src_fn mb_phase (Just (buf, _time))
2182 let dflags = hsc_dflags hsc_env
2183 -- case we bypass the preprocessing stage?
2185 local_opts = getOptions dflags buf src_fn
2187 (dflags', leftovers, warns)
2188 <- parseDynamicNoPackageFlags dflags local_opts
2189 liftIO $ checkProcessArgsResult leftovers -- XXX: throws exceptions
2190 liftIO $ handleFlagWarnings dflags' warns -- XXX: throws exceptions
2194 | Just (Unlit _) <- mb_phase = True
2195 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
2196 -- note: local_opts is only required if there's no Unlit phase
2197 | dopt Opt_Cpp dflags' = True
2198 | dopt Opt_Pp dflags' = True
2201 when needs_preprocessing $
2202 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
2204 return (dflags', src_fn, buf)
2207 -----------------------------------------------------------------------------
2209 -----------------------------------------------------------------------------
2211 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
2212 -- ToDo: we don't have a proper line number for this error
2213 noModError dflags loc wanted_mod err
2214 = throwOneError $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
2216 noHsFileErr :: GhcMonad m => SrcSpan -> String -> m a
2217 noHsFileErr loc path
2218 = throwOneError $ mkPlainErrMsg loc $ text "Can't find" <+> text path
2220 packageModErr :: GhcMonad m => ModuleName -> m a
2222 = throwOneError $ mkPlainErrMsg noSrcSpan $
2223 text "module" <+> quotes (ppr mod) <+> text "is a package module"
2225 multiRootsErr :: [ModSummary] -> IO ()
2226 multiRootsErr [] = panic "multiRootsErr"
2227 multiRootsErr summs@(summ1:_)
2228 = throwOneError $ mkPlainErrMsg noSrcSpan $
2229 text "module" <+> quotes (ppr mod) <+>
2230 text "is defined in multiple files:" <+>
2231 sep (map text files)
2234 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
2236 cyclicModuleErr :: [ModSummary] -> SDoc
2238 = hang (ptext (sLit "Module imports form a cycle for modules:"))
2239 2 (vcat (map show_one ms))
2241 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
2242 nest 2 $ ptext (sLit "imports:") <+>
2243 (pp_imps HsBootFile (ms_srcimps ms)
2244 $$ pp_imps HsSrcFile (ms_imps ms))]
2245 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
2246 pp_imps src mods = fsep (map (show_mod src) mods)
2249 -- | Inform GHC that the working directory has changed. GHC will flush
2250 -- its cache of module locations, since it may no longer be valid.
2251 -- Note: if you change the working directory, you should also unload
2252 -- the current program (set targets to empty, followed by load).
2253 workingDirectoryChanged :: GhcMonad m => m ()
2254 workingDirectoryChanged = withSession $ (liftIO . flushFinderCaches)
2256 -- -----------------------------------------------------------------------------
2257 -- inspecting the session
2259 -- | Get the module dependency graph.
2260 getModuleGraph :: GhcMonad m => m ModuleGraph -- ToDo: DiGraph ModSummary
2261 getModuleGraph = liftM hsc_mod_graph getSession
2263 -- | Return @True@ <==> module is loaded.
2264 isLoaded :: GhcMonad m => ModuleName -> m Bool
2265 isLoaded m = withSession $ \hsc_env ->
2266 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
2268 -- | Return the bindings for the current interactive session.
2269 getBindings :: GhcMonad m => m [TyThing]
2270 getBindings = withSession $ \hsc_env ->
2271 -- we have to implement the shadowing behaviour of ic_tmp_ids here
2272 -- (see InteractiveContext) and the quickest way is to use an OccEnv.
2274 tmp_ids = ic_tmp_ids (hsc_IC hsc_env)
2275 filtered = foldr f (const []) tmp_ids emptyUniqSet
2277 | uniq `elementOfUniqSet` set = rest set
2278 | otherwise = AnId id : rest (addOneToUniqSet set uniq)
2279 where uniq = getUnique (nameOccName (idName id))
2283 getPrintUnqual :: GhcMonad m => m PrintUnqualified
2284 getPrintUnqual = withSession $ \hsc_env ->
2285 return (icPrintUnqual (hsc_dflags hsc_env) (hsc_IC hsc_env))
2287 -- | Container for information about a 'Module'.
2288 data ModuleInfo = ModuleInfo {
2289 minf_type_env :: TypeEnv,
2290 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
2291 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
2292 minf_instances :: [Instance]
2294 ,minf_modBreaks :: ModBreaks
2296 -- ToDo: this should really contain the ModIface too
2298 -- We don't want HomeModInfo here, because a ModuleInfo applies
2299 -- to package modules too.
2301 -- | Request information about a loaded 'Module'
2302 getModuleInfo :: GhcMonad m => Module -> m (Maybe ModuleInfo) -- XXX: Maybe X
2303 getModuleInfo mdl = withSession $ \hsc_env -> do
2304 let mg = hsc_mod_graph hsc_env
2305 if mdl `elem` map ms_mod mg
2306 then liftIO $ getHomeModuleInfo hsc_env (moduleName mdl)
2308 {- if isHomeModule (hsc_dflags hsc_env) mdl
2310 else -} liftIO $ getPackageModuleInfo hsc_env mdl
2311 -- getPackageModuleInfo will attempt to find the interface, so
2312 -- we don't want to call it for a home module, just in case there
2313 -- was a problem loading the module and the interface doesn't
2314 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
2316 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
2318 getPackageModuleInfo hsc_env mdl = do
2319 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
2321 Nothing -> return Nothing
2323 eps <- readIORef (hsc_EPS hsc_env)
2325 names = availsToNameSet avails
2327 tys = [ ty | name <- concatMap availNames avails,
2328 Just ty <- [lookupTypeEnv pte name] ]
2330 return (Just (ModuleInfo {
2331 minf_type_env = mkTypeEnv tys,
2332 minf_exports = names,
2333 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
2334 minf_instances = error "getModuleInfo: instances for package module unimplemented",
2335 minf_modBreaks = emptyModBreaks
2338 getPackageModuleInfo _hsc_env _mdl = do
2339 -- bogusly different for non-GHCI (ToDo)
2343 getHomeModuleInfo :: HscEnv -> ModuleName -> IO (Maybe ModuleInfo)
2344 getHomeModuleInfo hsc_env mdl =
2345 case lookupUFM (hsc_HPT hsc_env) mdl of
2346 Nothing -> return Nothing
2348 let details = hm_details hmi
2349 return (Just (ModuleInfo {
2350 minf_type_env = md_types details,
2351 minf_exports = availsToNameSet (md_exports details),
2352 minf_rdr_env = mi_globals $! hm_iface hmi,
2353 minf_instances = md_insts details
2355 ,minf_modBreaks = getModBreaks hmi
2359 -- | The list of top-level entities defined in a module
2360 modInfoTyThings :: ModuleInfo -> [TyThing]
2361 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
2363 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
2364 modInfoTopLevelScope minf
2365 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
2367 modInfoExports :: ModuleInfo -> [Name]
2368 modInfoExports minf = nameSetToList $! minf_exports minf
2370 -- | Returns the instances defined by the specified module.
2371 -- Warning: currently unimplemented for package modules.
2372 modInfoInstances :: ModuleInfo -> [Instance]
2373 modInfoInstances = minf_instances
2375 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
2376 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
2378 mkPrintUnqualifiedForModule :: GhcMonad m =>
2380 -> m (Maybe PrintUnqualified) -- XXX: returns a Maybe X
2381 mkPrintUnqualifiedForModule minf = withSession $ \hsc_env -> do
2382 return (fmap (mkPrintUnqualified (hsc_dflags hsc_env)) (minf_rdr_env minf))
2384 modInfoLookupName :: GhcMonad m =>
2386 -> m (Maybe TyThing) -- XXX: returns a Maybe X
2387 modInfoLookupName minf name = withSession $ \hsc_env -> do
2388 case lookupTypeEnv (minf_type_env minf) name of
2389 Just tyThing -> return (Just tyThing)
2391 eps <- liftIO $ readIORef (hsc_EPS hsc_env)
2392 return $! lookupType (hsc_dflags hsc_env)
2393 (hsc_HPT hsc_env) (eps_PTE eps) name
2396 modInfoModBreaks :: ModuleInfo -> ModBreaks
2397 modInfoModBreaks = minf_modBreaks
2400 isDictonaryId :: Id -> Bool
2402 = case tcSplitSigmaTy (idType id) of { (_tvs, _theta, tau) -> isDictTy tau }
2404 -- | Looks up a global name: that is, any top-level name in any
2405 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
2406 -- the interactive context, and therefore does not require a preceding
2408 lookupGlobalName :: GhcMonad m => Name -> m (Maybe TyThing)
2409 lookupGlobalName name = withSession $ \hsc_env -> do
2410 eps <- liftIO $ readIORef (hsc_EPS hsc_env)
2411 return $! lookupType (hsc_dflags hsc_env)
2412 (hsc_HPT hsc_env) (eps_PTE eps) name
2415 -- | get the GlobalRdrEnv for a session
2416 getGRE :: GhcMonad m => m GlobalRdrEnv
2417 getGRE = withSession $ \hsc_env-> return $ ic_rn_gbl_env (hsc_IC hsc_env)
2420 -- -----------------------------------------------------------------------------
2421 -- Misc exported utils
2423 dataConType :: DataCon -> Type
2424 dataConType dc = idType (dataConWrapId dc)
2426 -- | print a 'NamedThing', adding parentheses if the name is an operator.
2427 pprParenSymName :: NamedThing a => a -> SDoc
2428 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
2430 -- ----------------------------------------------------------------------------
2435 -- - Data and Typeable instances for HsSyn.
2437 -- ToDo: check for small transformations that happen to the syntax in
2438 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
2440 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
2441 -- to get from TyCons, Ids etc. to TH syntax (reify).
2443 -- :browse will use either lm_toplev or inspect lm_interface, depending
2444 -- on whether the module is interpreted or not.
2448 -- Extract the filename, stringbuffer content and dynflags associed to a module
2450 -- XXX: Explain pre-conditions
2451 getModuleSourceAndFlags :: GhcMonad m => Module -> m (String, StringBuffer, DynFlags)
2452 getModuleSourceAndFlags mod = do
2453 m <- getModSummary (moduleName mod)
2454 case ml_hs_file $ ms_location m of
2455 Nothing -> throw $ mkApiErr (text "No source available for module " <+> ppr mod)
2456 Just sourceFile -> do
2457 source <- liftIO $ hGetStringBuffer sourceFile
2458 return (sourceFile, source, ms_hspp_opts m)
2461 -- | Return module source as token stream, including comments.
2463 -- The module must be in the module graph and its source must be available.
2464 -- Throws a 'HscTypes.SourceError' on parse error.
2465 getTokenStream :: GhcMonad m => Module -> m [Located Token]
2466 getTokenStream mod = do
2467 (sourceFile, source, flags) <- getModuleSourceAndFlags mod
2468 let startLoc = mkSrcLoc (mkFastString sourceFile) 0 0
2469 case lexTokenStream source startLoc flags of
2470 POk _ ts -> return ts
2471 PFailed span err -> throw $ mkSrcErr (unitBag $ mkPlainErrMsg span err)
2473 -- | Give even more information on the source than 'getTokenStream'
2474 -- This function allows reconstructing the source completely with
2475 -- 'showRichTokenStream'.
2476 getRichTokenStream :: GhcMonad m => Module -> m [(Located Token, String)]
2477 getRichTokenStream mod = do
2478 (sourceFile, source, flags) <- getModuleSourceAndFlags mod
2479 let startLoc = mkSrcLoc (mkFastString sourceFile) 0 0
2480 case lexTokenStream source startLoc flags of
2481 POk _ ts -> return $ addSourceToTokens startLoc source ts
2482 PFailed span err -> throw $ mkSrcErr (unitBag $ mkPlainErrMsg span err)
2484 -- | Given a source location and a StringBuffer corresponding to this
2485 -- location, return a rich token stream with the source associated to the
2487 addSourceToTokens :: SrcLoc -> StringBuffer -> [Located Token]
2488 -> [(Located Token, String)]
2489 addSourceToTokens _ _ [] = []
2490 addSourceToTokens loc buf (t@(L span _) : ts)
2491 | not (isGoodSrcSpan span) = (t,"") : addSourceToTokens loc buf ts
2492 | otherwise = (t,str) : addSourceToTokens newLoc newBuf ts
2494 (newLoc, newBuf, str) = go "" loc buf
2495 start = srcSpanStart span
2496 end = srcSpanEnd span
2497 go acc loc buf | loc < start = go acc nLoc nBuf
2498 | start <= loc && loc < end = go (ch:acc) nLoc nBuf
2499 | otherwise = (loc, buf, reverse acc)
2500 where (ch, nBuf) = nextChar buf
2501 nLoc = advanceSrcLoc loc ch
2504 -- | Take a rich token stream such as produced from 'getRichTokenStream' and
2505 -- return source code almost identical to the original code (except for
2506 -- insignificant whitespace.)
2507 showRichTokenStream :: [(Located Token, String)] -> String
2508 showRichTokenStream ts = go startLoc ts ""
2509 where sourceFile = srcSpanFile (getLoc . fst . head $ ts)
2510 startLoc = mkSrcLoc sourceFile 0 0
2512 go loc ((L span _, str):ts)
2513 | not (isGoodSrcSpan span) = go loc ts
2514 | locLine == tokLine = ((replicate (tokCol - locCol) ' ') ++)
2517 | otherwise = ((replicate (tokLine - locLine) '\n') ++)
2518 . ((replicate tokCol ' ') ++)
2521 where (locLine, locCol) = (srcLocLine loc, srcLocCol loc)
2522 (tokLine, tokCol) = (srcSpanStartLine span, srcSpanStartCol span)
2523 tokEnd = srcSpanEnd span
2525 -- -----------------------------------------------------------------------------
2526 -- Interactive evaluation
2528 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
2529 -- filesystem and package database to find the corresponding 'Module',
2530 -- using the algorithm that is used for an @import@ declaration.
2531 findModule :: GhcMonad m => ModuleName -> Maybe FastString -> m Module
2532 findModule mod_name maybe_pkg = withSession $ \hsc_env -> liftIO $ -- XXX
2534 dflags = hsc_dflags hsc_env
2535 hpt = hsc_HPT hsc_env
2536 this_pkg = thisPackage dflags
2538 case lookupUFM hpt mod_name of
2539 Just mod_info -> return (mi_module (hm_iface mod_info))
2540 _not_a_home_module -> do
2541 res <- findImportedModule hsc_env mod_name maybe_pkg
2543 Found _ m | modulePackageId m /= this_pkg -> return m
2544 | otherwise -> ghcError (CmdLineError (showSDoc $
2545 text "module" <+> quotes (ppr (moduleName m)) <+>
2546 text "is not loaded"))
2547 err -> let msg = cannotFindModule dflags mod_name err in
2548 ghcError (CmdLineError (showSDoc msg))
2551 getHistorySpan :: GhcMonad m => History -> m SrcSpan
2552 getHistorySpan h = withSession $ \hsc_env ->
2553 return$ InteractiveEval.getHistorySpan hsc_env h
2555 obtainTermFromVal :: GhcMonad m => Int -> Bool -> Type -> a -> m Term
2556 obtainTermFromVal bound force ty a =
2557 withSession $ \hsc_env ->
2558 liftIO $ InteractiveEval.obtainTermFromVal hsc_env bound force ty a
2560 obtainTermFromId :: GhcMonad m => Int -> Bool -> Id -> m Term
2561 obtainTermFromId bound force id =
2562 withSession $ \hsc_env ->
2563 liftIO $ InteractiveEval.obtainTermFromId hsc_env bound force id
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