1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
16 -- * Flags and settings
17 DynFlags(..), DynFlag(..), Severity(..), HscTarget(..), dopt,
18 GhcMode(..), GhcLink(..), defaultObjectTarget,
25 Target(..), TargetId(..), Phase,
32 -- * Extending the program scope
33 extendGlobalRdrScope, -- :: Session -> [GlobalRdrElt] -> IO ()
34 setGlobalRdrScope, -- :: Session -> [GlobalRdrElt] -> IO ()
35 extendGlobalTypeScope, -- :: Session -> [Id] -> IO ()
36 setGlobalTypeScope, -- :: Session -> [Id] -> IO ()
38 -- * Loading\/compiling the program
40 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
41 workingDirectoryChanged,
42 checkModule, CheckedModule(..),
43 TypecheckedSource, ParsedSource, RenamedSource,
46 -- * Parsing Haddock comments
49 -- * Inspecting the module structure of the program
50 ModuleGraph, ModSummary(..), ms_mod_name, ModLocation(..),
55 -- * Inspecting modules
62 modInfoIsExportedName,
65 mkPrintUnqualifiedForModule,
68 PrintUnqualified, alwaysQualify,
70 -- * Interactive evaluation
71 getBindings, getPrintUnqual,
74 setContext, getContext,
83 runStmt, SingleStep(..),
85 Resume(resumeStmt, resumeThreadId, resumeBreakInfo, resumeSpan,
86 resumeHistory, resumeHistoryIx),
87 History(historyBreakInfo, historyEnclosingDecl),
88 GHC.getHistorySpan, getHistoryModule,
92 InteractiveEval.forward,
95 compileExpr, HValue, dynCompileExpr,
97 GHC.obtainTerm, GHC.obtainTerm1, GHC.obtainTermB, reconstructType,
99 ModBreaks(..), BreakIndex,
100 BreakInfo(breakInfo_number, breakInfo_module),
101 BreakArray, setBreakOn, setBreakOff, getBreak,
104 -- * Abstract syntax elements
110 Module, mkModule, pprModule, moduleName, modulePackageId,
111 ModuleName, mkModuleName, moduleNameString,
115 isExternalName, nameModule, pprParenSymName, nameSrcSpan,
117 RdrName(Qual,Unqual),
121 isImplicitId, isDeadBinder,
122 isExportedId, isLocalId, isGlobalId,
124 isPrimOpId, isFCallId, isClassOpId_maybe,
125 isDataConWorkId, idDataCon,
126 isBottomingId, isDictonaryId,
127 recordSelectorFieldLabel,
129 -- ** Type constructors
131 tyConTyVars, tyConDataCons, tyConArity,
132 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
134 synTyConDefn, synTyConType, synTyConResKind,
140 -- ** Data constructors
142 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
143 dataConIsInfix, isVanillaDataCon,
145 StrictnessMark(..), isMarkedStrict,
149 classMethods, classSCTheta, classTvsFds,
154 instanceDFunId, pprInstance, pprInstanceHdr,
156 -- ** Types and Kinds
157 Type, dropForAlls, splitForAllTys, funResultTy,
158 pprParendType, pprTypeApp,
161 ThetaType, pprThetaArrow,
167 module HsSyn, -- ToDo: remove extraneous bits
171 defaultFixity, maxPrecedence,
175 -- ** Source locations
177 mkSrcLoc, isGoodSrcLoc, noSrcLoc,
178 srcLocFile, srcLocLine, srcLocCol,
180 mkSrcSpan, srcLocSpan, isGoodSrcSpan, noSrcSpan,
181 srcSpanStart, srcSpanEnd,
183 srcSpanStartLine, srcSpanEndLine,
184 srcSpanStartCol, srcSpanEndCol,
187 GhcException(..), showGhcException,
197 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
198 * what StaticFlags should we expose, if any?
201 #include "HsVersions.h"
204 import qualified Linker
205 import Linker ( HValue )
209 import InteractiveEval
214 import TcRnMonad ( initIfaceCheck )
219 import Type hiding (typeKind)
220 import TcType hiding (typeKind)
222 import Var hiding (setIdType)
223 import TysPrim ( alphaTyVars )
228 import Name hiding ( varName )
229 import OccName ( parenSymOcc )
230 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr )
233 import DriverPipeline
234 import DriverPhases ( HscSource(..), Phase(..), isHaskellSrcFilename, startPhase )
235 import HeaderInfo ( getImports, getOptions )
237 import HscMain ( newHscEnv, hscFileCheck, HscChecked(..) )
241 import SysTools ( initSysTools, cleanTempFiles, cleanTempFilesExcept,
251 import Bag ( unitBag, listToBag )
252 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
253 mkPlainErrMsg, printBagOfErrors, printBagOfWarnings,
255 import qualified ErrUtils
257 import StringBuffer ( StringBuffer, hGetStringBuffer )
260 import Maybes ( expectJust, mapCatMaybes )
262 import HaddockLex ( tokenise )
264 import Control.Concurrent
265 import System.Directory ( getModificationTime, doesFileExist )
268 import qualified Data.List as List
270 import System.Exit ( exitWith, ExitCode(..) )
271 import System.Time ( ClockTime )
272 import Control.Exception as Exception hiding (handle)
275 import System.IO.Error ( try, isDoesNotExistError )
276 import Prelude hiding (init)
279 -- -----------------------------------------------------------------------------
280 -- Exception handlers
282 -- | Install some default exception handlers and run the inner computation.
283 -- Unless you want to handle exceptions yourself, you should wrap this around
284 -- the top level of your program. The default handlers output the error
285 -- message(s) to stderr and exit cleanly.
286 defaultErrorHandler :: DynFlags -> IO a -> IO a
287 defaultErrorHandler dflags inner =
288 -- top-level exception handler: any unrecognised exception is a compiler bug.
289 handle (\exception -> do
292 -- an IO exception probably isn't our fault, so don't panic
294 fatalErrorMsg dflags (text (show exception))
295 AsyncException StackOverflow ->
296 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
298 fatalErrorMsg dflags (text (show (Panic (show exception))))
299 exitWith (ExitFailure 1)
302 -- program errors: messages with locations attached. Sometimes it is
303 -- convenient to just throw these as exceptions.
304 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
305 exitWith (ExitFailure 1)) $
307 -- error messages propagated as exceptions
308 handleDyn (\dyn -> do
311 PhaseFailed _ code -> exitWith code
312 Interrupted -> exitWith (ExitFailure 1)
313 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
314 exitWith (ExitFailure 1)
318 -- | Install a default cleanup handler to remove temporary files
319 -- deposited by a GHC run. This is seperate from
320 -- 'defaultErrorHandler', because you might want to override the error
321 -- handling, but still get the ordinary cleanup behaviour.
322 defaultCleanupHandler :: DynFlags -> IO a -> IO a
323 defaultCleanupHandler dflags inner =
324 -- make sure we clean up after ourselves
325 later (do cleanTempFiles dflags
328 -- exceptions will be blocked while we clean the temporary files,
329 -- so there shouldn't be any difficulty if we receive further
334 -- | Starts a new session. A session consists of a set of loaded
335 -- modules, a set of options (DynFlags), and an interactive context.
336 newSession :: Maybe FilePath -> IO Session
337 newSession mb_top_dir = do
339 main_thread <- myThreadId
340 modifyMVar_ interruptTargetThread (return . (main_thread :))
341 installSignalHandlers
344 dflags0 <- initSysTools mb_top_dir defaultDynFlags
345 dflags <- initDynFlags dflags0
346 env <- newHscEnv dflags
350 -- tmp: this breaks the abstraction, but required because DriverMkDepend
351 -- needs to call the Finder. ToDo: untangle this.
352 sessionHscEnv :: Session -> IO HscEnv
353 sessionHscEnv (Session ref) = readIORef ref
355 -- -----------------------------------------------------------------------------
358 -- | Grabs the DynFlags from the Session
359 getSessionDynFlags :: Session -> IO DynFlags
360 getSessionDynFlags s = withSession s (return . hsc_dflags)
362 -- | Updates the DynFlags in a Session. This also reads
363 -- the package database (unless it has already been read),
364 -- and prepares the compilers knowledge about packages. It
365 -- can be called again to load new packages: just add new
366 -- package flags to (packageFlags dflags).
368 -- Returns a list of new packages that may need to be linked in using
369 -- the dynamic linker (see 'linkPackages') as a result of new package
370 -- flags. If you are not doing linking or doing static linking, you
371 -- can ignore the list of packages returned.
373 setSessionDynFlags :: Session -> DynFlags -> IO [PackageId]
374 setSessionDynFlags (Session ref) dflags = do
375 hsc_env <- readIORef ref
376 (dflags', preload) <- initPackages dflags
377 writeIORef ref $! hsc_env{ hsc_dflags = dflags' }
380 -- | If there is no -o option, guess the name of target executable
381 -- by using top-level source file name as a base.
382 guessOutputFile :: Session -> IO ()
383 guessOutputFile s = modifySession s $ \env ->
384 let dflags = hsc_dflags env
385 mod_graph = hsc_mod_graph env
386 mainModuleSrcPath, guessedName :: Maybe String
387 mainModuleSrcPath = do
388 let isMain = (== mainModIs dflags) . ms_mod
389 [ms] <- return (filter isMain mod_graph)
390 ml_hs_file (ms_location ms)
391 guessedName = fmap basenameOf mainModuleSrcPath
393 case outputFile dflags of
395 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
397 -- -----------------------------------------------------------------------------
400 -- ToDo: think about relative vs. absolute file paths. And what
401 -- happens when the current directory changes.
403 -- | Sets the targets for this session. Each target may be a module name
404 -- or a filename. The targets correspond to the set of root modules for
405 -- the program\/library. Unloading the current program is achieved by
406 -- setting the current set of targets to be empty, followed by load.
407 setTargets :: Session -> [Target] -> IO ()
408 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
410 -- | returns the current set of targets
411 getTargets :: Session -> IO [Target]
412 getTargets s = withSession s (return . hsc_targets)
414 -- | Add another target
415 addTarget :: Session -> Target -> IO ()
417 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
420 removeTarget :: Session -> TargetId -> IO ()
421 removeTarget s target_id
422 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
424 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
426 -- Attempts to guess what Target a string refers to. This function implements
427 -- the --make/GHCi command-line syntax for filenames:
429 -- - if the string looks like a Haskell source filename, then interpret
431 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
433 -- - otherwise interpret the string as a module name
435 guessTarget :: String -> Maybe Phase -> IO Target
436 guessTarget file (Just phase)
437 = return (Target (TargetFile file (Just phase)) Nothing)
438 guessTarget file Nothing
439 | isHaskellSrcFilename file
440 = return (Target (TargetFile file Nothing) Nothing)
442 = do exists <- doesFileExist hs_file
444 then return (Target (TargetFile hs_file Nothing) Nothing)
446 exists <- doesFileExist lhs_file
448 then return (Target (TargetFile lhs_file Nothing) Nothing)
450 return (Target (TargetModule (mkModuleName file)) Nothing)
452 hs_file = file `joinFileExt` "hs"
453 lhs_file = file `joinFileExt` "lhs"
455 -- -----------------------------------------------------------------------------
456 -- Extending the program scope
458 extendGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
459 extendGlobalRdrScope session rdrElts
460 = modifySession session $ \hscEnv ->
461 let global_rdr = hsc_global_rdr_env hscEnv
462 in hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv global_rdr rdrElts }
464 setGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
465 setGlobalRdrScope session rdrElts
466 = modifySession session $ \hscEnv ->
467 hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv emptyGlobalRdrEnv rdrElts }
469 extendGlobalTypeScope :: Session -> [Id] -> IO ()
470 extendGlobalTypeScope session ids
471 = modifySession session $ \hscEnv ->
472 let global_type = hsc_global_type_env hscEnv
473 in hscEnv{ hsc_global_type_env = extendTypeEnvWithIds global_type ids }
475 setGlobalTypeScope :: Session -> [Id] -> IO ()
476 setGlobalTypeScope session ids
477 = modifySession session $ \hscEnv ->
478 hscEnv{ hsc_global_type_env = extendTypeEnvWithIds emptyTypeEnv ids }
480 -- -----------------------------------------------------------------------------
481 -- Parsing Haddock comments
483 parseHaddockComment :: String -> Either String (HsDoc RdrName)
484 parseHaddockComment string = parseHaddockParagraphs (tokenise string)
486 -- -----------------------------------------------------------------------------
487 -- Loading the program
489 -- Perform a dependency analysis starting from the current targets
490 -- and update the session with the new module graph.
491 depanal :: Session -> [ModuleName] -> Bool -> IO (Maybe ModuleGraph)
492 depanal (Session ref) excluded_mods allow_dup_roots = do
493 hsc_env <- readIORef ref
495 dflags = hsc_dflags hsc_env
496 targets = hsc_targets hsc_env
497 old_graph = hsc_mod_graph hsc_env
499 showPass dflags "Chasing dependencies"
500 debugTraceMsg dflags 2 (hcat [
501 text "Chasing modules from: ",
502 hcat (punctuate comma (map pprTarget targets))])
504 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
506 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
511 -- | The result of load.
513 = LoadOk Errors -- ^ all specified targets were loaded successfully.
514 | LoadFailed Errors -- ^ not all modules were loaded.
516 type Errors = [String]
518 data ErrMsg = ErrMsg {
519 errMsgSeverity :: Severity, -- warning, error, etc.
520 errMsgSpans :: [SrcSpan],
521 errMsgShortDoc :: Doc,
522 errMsgExtraInfo :: Doc
528 | LoadUpTo ModuleName
529 | LoadDependenciesOf ModuleName
531 -- | Try to load the program. If a Module is supplied, then just
532 -- attempt to load up to this target. If no Module is supplied,
533 -- then try to load all targets.
534 load :: Session -> LoadHowMuch -> IO SuccessFlag
535 load s@(Session ref) how_much
537 -- Dependency analysis first. Note that this fixes the module graph:
538 -- even if we don't get a fully successful upsweep, the full module
539 -- graph is still retained in the Session. We can tell which modules
540 -- were successfully loaded by inspecting the Session's HPT.
541 mb_graph <- depanal s [] False
543 Just mod_graph -> catchingFailure $ load2 s how_much mod_graph
544 Nothing -> return Failed
545 where catchingFailure f = f `Exception.catch` \e -> do
546 hsc_env <- readIORef ref
547 -- trac #1565 / test ghci021:
548 -- let bindings may explode if we try to use them after
550 writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
553 load2 :: Session -> LoadHowMuch -> [ModSummary] -> IO SuccessFlag
554 load2 s@(Session ref) how_much mod_graph = do
556 hsc_env <- readIORef ref
558 let hpt1 = hsc_HPT hsc_env
559 let dflags = hsc_dflags hsc_env
561 -- The "bad" boot modules are the ones for which we have
562 -- B.hs-boot in the module graph, but no B.hs
563 -- The downsweep should have ensured this does not happen
565 let all_home_mods = [ms_mod_name s
566 | s <- mod_graph, not (isBootSummary s)]
567 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
568 not (ms_mod_name s `elem` all_home_mods)]
569 ASSERT( null bad_boot_mods ) return ()
571 -- mg2_with_srcimps drops the hi-boot nodes, returning a
572 -- graph with cycles. Among other things, it is used for
573 -- backing out partially complete cycles following a failed
574 -- upsweep, and for removing from hpt all the modules
575 -- not in strict downwards closure, during calls to compile.
576 let mg2_with_srcimps :: [SCC ModSummary]
577 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
579 -- If we can determine that any of the {-# SOURCE #-} imports
580 -- are definitely unnecessary, then emit a warning.
581 warnUnnecessarySourceImports dflags mg2_with_srcimps
584 -- check the stability property for each module.
585 stable_mods@(stable_obj,stable_bco)
586 = checkStability hpt1 mg2_with_srcimps all_home_mods
588 -- prune bits of the HPT which are definitely redundant now,
590 pruned_hpt = pruneHomePackageTable hpt1
591 (flattenSCCs mg2_with_srcimps)
596 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
597 text "Stable BCO:" <+> ppr stable_bco)
599 -- Unload any modules which are going to be re-linked this time around.
600 let stable_linkables = [ linkable
601 | m <- stable_obj++stable_bco,
602 Just hmi <- [lookupUFM pruned_hpt m],
603 Just linkable <- [hm_linkable hmi] ]
604 unload hsc_env stable_linkables
606 -- We could at this point detect cycles which aren't broken by
607 -- a source-import, and complain immediately, but it seems better
608 -- to let upsweep_mods do this, so at least some useful work gets
609 -- done before the upsweep is abandoned.
610 --hPutStrLn stderr "after tsort:\n"
611 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
613 -- Now do the upsweep, calling compile for each module in
614 -- turn. Final result is version 3 of everything.
616 -- Topologically sort the module graph, this time including hi-boot
617 -- nodes, and possibly just including the portion of the graph
618 -- reachable from the module specified in the 2nd argument to load.
619 -- This graph should be cycle-free.
620 -- If we're restricting the upsweep to a portion of the graph, we
621 -- also want to retain everything that is still stable.
622 let full_mg :: [SCC ModSummary]
623 full_mg = topSortModuleGraph False mod_graph Nothing
625 maybe_top_mod = case how_much of
627 LoadDependenciesOf m -> Just m
630 partial_mg0 :: [SCC ModSummary]
631 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
633 -- LoadDependenciesOf m: we want the upsweep to stop just
634 -- short of the specified module (unless the specified module
637 | LoadDependenciesOf _mod <- how_much
638 = ASSERT( case last partial_mg0 of
639 AcyclicSCC ms -> ms_mod_name ms == _mod; _ -> False )
640 List.init partial_mg0
646 | AcyclicSCC ms <- full_mg,
647 ms_mod_name ms `elem` stable_obj++stable_bco,
648 ms_mod_name ms `notElem` [ ms_mod_name ms' |
649 AcyclicSCC ms' <- partial_mg ] ]
651 mg = stable_mg ++ partial_mg
653 -- clean up between compilations
654 let cleanup = cleanTempFilesExcept dflags
655 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
657 debugTraceMsg dflags 2 (hang (text "Ready for upsweep")
659 (upsweep_ok, hsc_env1, modsUpswept)
660 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
661 pruned_hpt stable_mods cleanup mg
663 -- Make modsDone be the summaries for each home module now
664 -- available; this should equal the domain of hpt3.
665 -- Get in in a roughly top .. bottom order (hence reverse).
667 let modsDone = reverse modsUpswept
669 -- Try and do linking in some form, depending on whether the
670 -- upsweep was completely or only partially successful.
672 if succeeded upsweep_ok
675 -- Easy; just relink it all.
676 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
678 -- Clean up after ourselves
679 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
681 -- Issue a warning for the confusing case where the user
682 -- said '-o foo' but we're not going to do any linking.
683 -- We attempt linking if either (a) one of the modules is
684 -- called Main, or (b) the user said -no-hs-main, indicating
685 -- that main() is going to come from somewhere else.
687 let ofile = outputFile dflags
688 let no_hs_main = dopt Opt_NoHsMain dflags
690 main_mod = mainModIs dflags
691 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
692 do_linking = a_root_is_Main || no_hs_main
694 when (ghcLink dflags == LinkBinary
695 && isJust ofile && not do_linking) $
696 debugTraceMsg dflags 1 $
697 text ("Warning: output was redirected with -o, " ++
698 "but no output will be generated\n" ++
699 "because there is no " ++
700 moduleNameString (moduleName main_mod) ++ " module.")
702 -- link everything together
703 linkresult <- link (ghcLink dflags) dflags do_linking (hsc_HPT hsc_env1)
705 loadFinish Succeeded linkresult ref hsc_env1
708 -- Tricky. We need to back out the effects of compiling any
709 -- half-done cycles, both so as to clean up the top level envs
710 -- and to avoid telling the interactive linker to link them.
711 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
714 = map ms_mod modsDone
715 let mods_to_zap_names
716 = findPartiallyCompletedCycles modsDone_names
719 = filter ((`notElem` mods_to_zap_names).ms_mod)
722 let hpt4 = retainInTopLevelEnvs (map ms_mod_name mods_to_keep)
725 -- Clean up after ourselves
726 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
728 -- there should be no Nothings where linkables should be, now
729 ASSERT(all (isJust.hm_linkable)
730 (eltsUFM (hsc_HPT hsc_env))) do
732 -- Link everything together
733 linkresult <- link (ghcLink dflags) dflags False hpt4
735 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
736 loadFinish Failed linkresult ref hsc_env4
738 -- Finish up after a load.
740 -- If the link failed, unload everything and return.
741 loadFinish :: SuccessFlag -> SuccessFlag -> IORef HscEnv -> HscEnv -> IO SuccessFlag
742 loadFinish _all_ok Failed ref hsc_env
743 = do unload hsc_env []
744 writeIORef ref $! discardProg hsc_env
747 -- Empty the interactive context and set the module context to the topmost
748 -- newly loaded module, or the Prelude if none were loaded.
749 loadFinish all_ok Succeeded ref hsc_env
750 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
754 -- Forget the current program, but retain the persistent info in HscEnv
755 discardProg :: HscEnv -> HscEnv
757 = hsc_env { hsc_mod_graph = emptyMG,
758 hsc_IC = emptyInteractiveContext,
759 hsc_HPT = emptyHomePackageTable }
761 -- used to fish out the preprocess output files for the purposes of
762 -- cleaning up. The preprocessed file *might* be the same as the
763 -- source file, but that doesn't do any harm.
764 ppFilesFromSummaries :: [ModSummary] -> [FilePath]
765 ppFilesFromSummaries summaries = map ms_hspp_file summaries
767 -- -----------------------------------------------------------------------------
771 CheckedModule { parsedSource :: ParsedSource,
772 renamedSource :: Maybe RenamedSource,
773 typecheckedSource :: Maybe TypecheckedSource,
774 checkedModuleInfo :: Maybe ModuleInfo,
775 coreBinds :: Maybe [CoreBind]
777 -- ToDo: improvements that could be made here:
778 -- if the module succeeded renaming but not typechecking,
779 -- we can still get back the GlobalRdrEnv and exports, so
780 -- perhaps the ModuleInfo should be split up into separate
781 -- fields within CheckedModule.
783 type ParsedSource = Located (HsModule RdrName)
784 type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
785 Maybe (HsDoc Name), HaddockModInfo Name)
786 type TypecheckedSource = LHsBinds Id
789 -- - things that aren't in the output of the typechecker right now:
793 -- - type/data/newtype declarations
794 -- - class declarations
796 -- - extra things in the typechecker's output:
797 -- - default methods are turned into top-level decls.
798 -- - dictionary bindings
801 -- | This is the way to get access to parsed and typechecked source code
802 -- for a module. 'checkModule' attempts to typecheck the module. If
803 -- successful, it returns the abstract syntax for the module.
804 -- If compileToCore is true, it also desugars the module and returns the
805 -- resulting Core bindings as a component of the CheckedModule.
806 checkModule :: Session -> ModuleName -> Bool -> IO (Maybe CheckedModule)
807 checkModule (Session ref) mod compileToCore = do
808 -- parse & typecheck the module
809 hsc_env <- readIORef ref
810 let mg = hsc_mod_graph hsc_env
811 case [ ms | ms <- mg, ms_mod_name ms == mod ] of
814 mbChecked <- hscFileCheck
815 hsc_env{hsc_dflags=ms_hspp_opts ms}
818 Nothing -> return Nothing
819 Just (HscChecked parsed renamed Nothing _) ->
820 return (Just (CheckedModule {
821 parsedSource = parsed,
822 renamedSource = renamed,
823 typecheckedSource = Nothing,
824 checkedModuleInfo = Nothing,
825 coreBinds = Nothing }))
826 Just (HscChecked parsed renamed
827 (Just (tc_binds, rdr_env, details))
828 maybeCoreBinds) -> do
829 let minf = ModuleInfo {
830 minf_type_env = md_types details,
831 minf_exports = availsToNameSet $
833 minf_rdr_env = Just rdr_env,
834 minf_instances = md_insts details
836 ,minf_modBreaks = emptyModBreaks
839 return (Just (CheckedModule {
840 parsedSource = parsed,
841 renamedSource = renamed,
842 typecheckedSource = Just tc_binds,
843 checkedModuleInfo = Just minf,
844 coreBinds = maybeCoreBinds}))
846 -- | This is the way to get access to the Core bindings corresponding
847 -- to a module. 'compileToCore' invokes 'checkModule' to parse, typecheck, and
848 -- desugar the module, then returns the resulting list of Core bindings if
850 compileToCore :: Session -> FilePath -> IO (Maybe [CoreBind])
851 compileToCore session fn = do
852 -- First, set the target to the desired filename
853 target <- guessTarget fn Nothing
854 addTarget session target
855 load session LoadAllTargets
856 -- Then find dependencies
857 maybeModGraph <- depanal session [] True
858 case maybeModGraph of
859 Nothing -> return Nothing
861 let modSummary = expectJust "compileToCore" $
862 find ((== fn) . msHsFilePath) modGraph
863 -- Now we have the module name;
864 -- parse, typecheck and desugar the module
865 let mod = ms_mod_name modSummary
866 maybeCheckedModule <- checkModule session mod True
867 case maybeCheckedModule of
868 Nothing -> return Nothing
869 Just checkedMod -> return $ coreBinds checkedMod
870 -- ---------------------------------------------------------------------------
873 unload :: HscEnv -> [Linkable] -> IO ()
874 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
875 = case ghcLink (hsc_dflags hsc_env) of
877 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
879 LinkInMemory -> panic "unload: no interpreter"
880 -- urgh. avoid warnings:
881 hsc_env stable_linkables
885 -- -----------------------------------------------------------------------------
889 Stability tells us which modules definitely do not need to be recompiled.
890 There are two main reasons for having stability:
892 - avoid doing a complete upsweep of the module graph in GHCi when
893 modules near the bottom of the tree have not changed.
895 - to tell GHCi when it can load object code: we can only load object code
896 for a module when we also load object code fo all of the imports of the
897 module. So we need to know that we will definitely not be recompiling
898 any of these modules, and we can use the object code.
900 The stability check is as follows. Both stableObject and
901 stableBCO are used during the upsweep phase later.
904 stable m = stableObject m || stableBCO m
907 all stableObject (imports m)
908 && old linkable does not exist, or is == on-disk .o
909 && date(on-disk .o) > date(.hs)
912 all stable (imports m)
913 && date(BCO) > date(.hs)
916 These properties embody the following ideas:
918 - if a module is stable, then:
919 - if it has been compiled in a previous pass (present in HPT)
920 then it does not need to be compiled or re-linked.
921 - if it has not been compiled in a previous pass,
922 then we only need to read its .hi file from disk and
923 link it to produce a ModDetails.
925 - if a modules is not stable, we will definitely be at least
926 re-linking, and possibly re-compiling it during the upsweep.
927 All non-stable modules can (and should) therefore be unlinked
930 - Note that objects are only considered stable if they only depend
931 on other objects. We can't link object code against byte code.
935 :: HomePackageTable -- HPT from last compilation
936 -> [SCC ModSummary] -- current module graph (cyclic)
937 -> [ModuleName] -- all home modules
938 -> ([ModuleName], -- stableObject
939 [ModuleName]) -- stableBCO
941 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
943 checkSCC (stable_obj, stable_bco) scc0
944 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
945 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
946 | otherwise = (stable_obj, stable_bco)
948 scc = flattenSCC scc0
949 scc_mods = map ms_mod_name scc
950 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
952 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
953 -- all imports outside the current SCC, but in the home pkg
955 stable_obj_imps = map (`elem` stable_obj) scc_allimps
956 stable_bco_imps = map (`elem` stable_bco) scc_allimps
963 and (zipWith (||) stable_obj_imps stable_bco_imps)
967 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
971 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
972 Just hmi | Just l <- hm_linkable hmi
973 -> isObjectLinkable l && t == linkableTime l
975 -- why '>=' rather than '>' above? If the filesystem stores
976 -- times to the nearset second, we may occasionally find that
977 -- the object & source have the same modification time,
978 -- especially if the source was automatically generated
979 -- and compiled. Using >= is slightly unsafe, but it matches
983 = case lookupUFM hpt (ms_mod_name ms) of
984 Just hmi | Just l <- hm_linkable hmi ->
985 not (isObjectLinkable l) &&
986 linkableTime l >= ms_hs_date ms
989 ms_allimps :: ModSummary -> [ModuleName]
990 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
992 -- -----------------------------------------------------------------------------
993 -- Prune the HomePackageTable
995 -- Before doing an upsweep, we can throw away:
997 -- - For non-stable modules:
998 -- - all ModDetails, all linked code
999 -- - all unlinked code that is out of date with respect to
1002 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
1003 -- space at the end of the upsweep, because the topmost ModDetails of the
1004 -- old HPT holds on to the entire type environment from the previous
1007 pruneHomePackageTable
1010 -> ([ModuleName],[ModuleName])
1013 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
1016 | is_stable modl = hmi'
1017 | otherwise = hmi'{ hm_details = emptyModDetails }
1019 modl = moduleName (mi_module (hm_iface hmi))
1020 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
1021 = hmi{ hm_linkable = Nothing }
1024 where ms = expectJust "prune" (lookupUFM ms_map modl)
1026 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
1028 is_stable m = m `elem` stable_obj || m `elem` stable_bco
1030 -- -----------------------------------------------------------------------------
1032 -- Return (names of) all those in modsDone who are part of a cycle
1033 -- as defined by theGraph.
1034 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1035 findPartiallyCompletedCycles modsDone theGraph
1039 chew ((AcyclicSCC _):rest) = chew rest -- acyclic? not interesting.
1040 chew ((CyclicSCC vs):rest)
1041 = let names_in_this_cycle = nub (map ms_mod vs)
1043 = nub ([done | done <- modsDone,
1044 done `elem` names_in_this_cycle])
1045 chewed_rest = chew rest
1047 if notNull mods_in_this_cycle
1048 && length mods_in_this_cycle < length names_in_this_cycle
1049 then mods_in_this_cycle ++ chewed_rest
1052 -- -----------------------------------------------------------------------------
1055 -- This is where we compile each module in the module graph, in a pass
1056 -- from the bottom to the top of the graph.
1058 -- There better had not be any cyclic groups here -- we check for them.
1061 :: HscEnv -- Includes initially-empty HPT
1062 -> HomePackageTable -- HPT from last time round (pruned)
1063 -> ([ModuleName],[ModuleName]) -- stable modules (see checkStability)
1064 -> IO () -- How to clean up unwanted tmp files
1065 -> [SCC ModSummary] -- Mods to do (the worklist)
1067 HscEnv, -- With an updated HPT
1068 [ModSummary]) -- Mods which succeeded
1070 upsweep hsc_env old_hpt stable_mods cleanup sccs = do
1071 (res, hsc_env, done) <- upsweep' hsc_env old_hpt [] sccs 1 (length sccs)
1072 return (res, hsc_env, reverse done)
1075 upsweep' hsc_env _old_hpt done
1077 = return (Succeeded, hsc_env, done)
1079 upsweep' hsc_env _old_hpt done
1080 (CyclicSCC ms:_) _ _
1081 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1082 return (Failed, hsc_env, done)
1084 upsweep' hsc_env old_hpt done
1085 (AcyclicSCC mod:mods) mod_index nmods
1086 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1087 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1088 -- (moduleEnvElts (hsc_HPT hsc_env)))
1090 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1093 cleanup -- Remove unwanted tmp files between compilations
1096 Nothing -> return (Failed, hsc_env, [])
1098 let this_mod = ms_mod_name mod
1100 -- Add new info to hsc_env
1101 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1102 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1104 -- Space-saving: delete the old HPT entry
1105 -- for mod BUT if mod is a hs-boot
1106 -- node, don't delete it. For the
1107 -- interface, the HPT entry is probaby for the
1108 -- main Haskell source file. Deleting it
1109 -- would force the real module to be recompiled
1111 old_hpt1 | isBootSummary mod = old_hpt
1112 | otherwise = delFromUFM old_hpt this_mod
1116 -- fixup our HomePackageTable after we've finished compiling
1117 -- a mutually-recursive loop. See reTypecheckLoop, below.
1118 hsc_env2 <- reTypecheckLoop hsc_env1 mod done'
1120 upsweep' hsc_env2 old_hpt1 done' mods (mod_index+1) nmods
1123 -- Compile a single module. Always produce a Linkable for it if
1124 -- successful. If no compilation happened, return the old Linkable.
1125 upsweep_mod :: HscEnv
1127 -> ([ModuleName],[ModuleName])
1129 -> Int -- index of module
1130 -> Int -- total number of modules
1131 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1133 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1135 this_mod_name = ms_mod_name summary
1136 this_mod = ms_mod summary
1137 mb_obj_date = ms_obj_date summary
1138 obj_fn = ml_obj_file (ms_location summary)
1139 hs_date = ms_hs_date summary
1141 is_stable_obj = this_mod_name `elem` stable_obj
1142 is_stable_bco = this_mod_name `elem` stable_bco
1144 old_hmi = lookupUFM old_hpt this_mod_name
1146 -- We're using the dflags for this module now, obtained by
1147 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1148 dflags = ms_hspp_opts summary
1149 prevailing_target = hscTarget (hsc_dflags hsc_env)
1150 local_target = hscTarget dflags
1152 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1153 -- we don't do anything dodgy: these should only work to change
1154 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1155 -- end up trying to link object code to byte code.
1156 target = if prevailing_target /= local_target
1157 && (not (isObjectTarget prevailing_target)
1158 || not (isObjectTarget local_target))
1159 then prevailing_target
1162 -- store the corrected hscTarget into the summary
1163 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1165 -- The old interface is ok if
1166 -- a) we're compiling a source file, and the old HPT
1167 -- entry is for a source file
1168 -- b) we're compiling a hs-boot file
1169 -- Case (b) allows an hs-boot file to get the interface of its
1170 -- real source file on the second iteration of the compilation
1171 -- manager, but that does no harm. Otherwise the hs-boot file
1172 -- will always be recompiled
1177 Just hm_info | isBootSummary summary -> Just iface
1178 | not (mi_boot iface) -> Just iface
1179 | otherwise -> Nothing
1181 iface = hm_iface hm_info
1183 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1184 compile_it = compile hsc_env summary' mod_index nmods mb_old_iface
1186 compile_it_discard_iface
1187 = compile hsc_env summary' mod_index nmods Nothing
1193 -- Regardless of whether we're generating object code or
1194 -- byte code, we can always use an existing object file
1195 -- if it is *stable* (see checkStability).
1196 | is_stable_obj, isJust old_hmi ->
1198 -- object is stable, and we have an entry in the
1199 -- old HPT: nothing to do
1201 | is_stable_obj, isNothing old_hmi -> do
1202 linkable <- findObjectLinkable this_mod obj_fn
1203 (expectJust "upseep1" mb_obj_date)
1204 compile_it (Just linkable)
1205 -- object is stable, but we need to load the interface
1206 -- off disk to make a HMI.
1210 ASSERT(isJust old_hmi) -- must be in the old_hpt
1212 -- BCO is stable: nothing to do
1214 | Just hmi <- old_hmi,
1215 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1216 linkableTime l >= ms_hs_date summary ->
1218 -- we have an old BCO that is up to date with respect
1219 -- to the source: do a recompilation check as normal.
1223 -- no existing code at all: we must recompile.
1225 -- When generating object code, if there's an up-to-date
1226 -- object file on the disk, then we can use it.
1227 -- However, if the object file is new (compared to any
1228 -- linkable we had from a previous compilation), then we
1229 -- must discard any in-memory interface, because this
1230 -- means the user has compiled the source file
1231 -- separately and generated a new interface, that we must
1232 -- read from the disk.
1234 obj | isObjectTarget obj,
1235 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1238 | Just l <- hm_linkable hmi,
1239 isObjectLinkable l && linkableTime l == obj_date
1240 -> compile_it (Just l)
1242 linkable <- findObjectLinkable this_mod obj_fn obj_date
1243 compile_it_discard_iface (Just linkable)
1250 -- Filter modules in the HPT
1251 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1252 retainInTopLevelEnvs keep_these hpt
1253 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1255 , let mb_mod_info = lookupUFM hpt mod
1256 , isJust mb_mod_info ]
1258 -- ---------------------------------------------------------------------------
1259 -- Typecheck module loops
1262 See bug #930. This code fixes a long-standing bug in --make. The
1263 problem is that when compiling the modules *inside* a loop, a data
1264 type that is only defined at the top of the loop looks opaque; but
1265 after the loop is done, the structure of the data type becomes
1268 The difficulty is then that two different bits of code have
1269 different notions of what the data type looks like.
1271 The idea is that after we compile a module which also has an .hs-boot
1272 file, we re-generate the ModDetails for each of the modules that
1273 depends on the .hs-boot file, so that everyone points to the proper
1274 TyCons, Ids etc. defined by the real module, not the boot module.
1275 Fortunately re-generating a ModDetails from a ModIface is easy: the
1276 function TcIface.typecheckIface does exactly that.
1278 Picking the modules to re-typecheck is slightly tricky. Starting from
1279 the module graph consisting of the modules that have already been
1280 compiled, we reverse the edges (so they point from the imported module
1281 to the importing module), and depth-first-search from the .hs-boot
1282 node. This gives us all the modules that depend transitively on the
1283 .hs-boot module, and those are exactly the modules that we need to
1286 Following this fix, GHC can compile itself with --make -O2.
1289 reTypecheckLoop :: HscEnv -> ModSummary -> ModuleGraph -> IO HscEnv
1290 reTypecheckLoop hsc_env ms graph
1291 | not (isBootSummary ms) &&
1292 any (\m -> ms_mod m == this_mod && isBootSummary m) graph
1294 let mss = reachableBackwards (ms_mod_name ms) graph
1295 non_boot = filter (not.isBootSummary) mss
1296 debugTraceMsg (hsc_dflags hsc_env) 2 $
1297 text "Re-typechecking loop: " <> ppr (map ms_mod_name non_boot)
1298 typecheckLoop hsc_env (map ms_mod_name non_boot)
1302 this_mod = ms_mod ms
1304 typecheckLoop :: HscEnv -> [ModuleName] -> IO HscEnv
1305 typecheckLoop hsc_env mods = do
1307 fixIO $ \new_hpt -> do
1308 let new_hsc_env = hsc_env{ hsc_HPT = new_hpt }
1309 mds <- initIfaceCheck new_hsc_env $
1310 mapM (typecheckIface . hm_iface) hmis
1311 let new_hpt = addListToUFM old_hpt
1312 (zip mods [ hmi{ hm_details = details }
1313 | (hmi,details) <- zip hmis mds ])
1315 return hsc_env{ hsc_HPT = new_hpt }
1317 old_hpt = hsc_HPT hsc_env
1318 hmis = map (expectJust "typecheckLoop" . lookupUFM old_hpt) mods
1320 reachableBackwards :: ModuleName -> [ModSummary] -> [ModSummary]
1321 reachableBackwards mod summaries
1322 = [ ms | (ms,_,_) <- map vertex_fn nodes_we_want ]
1324 -- all the nodes reachable by traversing the edges backwards
1325 -- from the root node:
1326 nodes_we_want = reachable (transposeG graph) root
1328 -- the rest just sets up the graph:
1329 (nodes, lookup_key) = moduleGraphNodes False summaries
1330 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1332 | Just key <- lookup_key HsBootFile mod, Just v <- key_fn key = v
1333 | otherwise = panic "reachableBackwards"
1335 -- ---------------------------------------------------------------------------
1336 -- Topological sort of the module graph
1339 :: Bool -- Drop hi-boot nodes? (see below)
1343 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1344 -- The resulting list of strongly-connected-components is in topologically
1345 -- sorted order, starting with the module(s) at the bottom of the
1346 -- dependency graph (ie compile them first) and ending with the ones at
1349 -- Drop hi-boot nodes (first boolean arg)?
1351 -- False: treat the hi-boot summaries as nodes of the graph,
1352 -- so the graph must be acyclic
1354 -- True: eliminate the hi-boot nodes, and instead pretend
1355 -- the a source-import of Foo is an import of Foo
1356 -- The resulting graph has no hi-boot nodes, but can by cyclic
1358 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1359 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1360 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1361 = stronglyConnComp (map vertex_fn (reachable graph root))
1363 -- restrict the graph to just those modules reachable from
1364 -- the specified module. We do this by building a graph with
1365 -- the full set of nodes, and determining the reachable set from
1366 -- the specified node.
1367 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1368 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1370 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1371 | otherwise = throwDyn (ProgramError "module does not exist")
1373 moduleGraphNodes :: Bool -> [ModSummary]
1374 -> ([(ModSummary, Int, [Int])], HscSource -> ModuleName -> Maybe Int)
1375 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1377 -- Drop hs-boot nodes by using HsSrcFile as the key
1378 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1379 | otherwise = HsBootFile
1381 -- We use integers as the keys for the SCC algorithm
1382 nodes :: [(ModSummary, Int, [Int])]
1383 nodes = [(s, expectJust "topSort" $
1384 lookup_key (ms_hsc_src s) (ms_mod_name s),
1385 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1386 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1387 (-- see [boot-edges] below
1388 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1390 else case lookup_key HsBootFile (ms_mod_name s) of
1395 , not (isBootSummary s && drop_hs_boot_nodes) ]
1396 -- Drop the hi-boot ones if told to do so
1398 -- [boot-edges] if this is a .hs and there is an equivalent
1399 -- .hs-boot, add a link from the former to the latter. This
1400 -- has the effect of detecting bogus cases where the .hs-boot
1401 -- depends on the .hs, by introducing a cycle. Additionally,
1402 -- it ensures that we will always process the .hs-boot before
1403 -- the .hs, and so the HomePackageTable will always have the
1404 -- most up to date information.
1406 key_map :: NodeMap Int
1407 key_map = listToFM ([(moduleName (ms_mod s), ms_hsc_src s)
1411 lookup_key :: HscSource -> ModuleName -> Maybe Int
1412 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1414 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1415 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1416 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1417 -- the IsBootInterface parameter True; else False
1420 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1421 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1423 msKey :: ModSummary -> NodeKey
1424 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1426 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1427 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1429 nodeMapElts :: NodeMap a -> [a]
1430 nodeMapElts = eltsFM
1432 -- If there are {-# SOURCE #-} imports between strongly connected
1433 -- components in the topological sort, then those imports can
1434 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1435 -- were necessary, then the edge would be part of a cycle.
1436 warnUnnecessarySourceImports :: DynFlags -> [SCC ModSummary] -> IO ()
1437 warnUnnecessarySourceImports dflags sccs =
1438 printBagOfWarnings dflags (listToBag (concat (map (check.flattenSCC) sccs)))
1440 let mods_in_this_cycle = map ms_mod_name ms in
1441 [ warn i | m <- ms, i <- ms_srcimps m,
1442 unLoc i `notElem` mods_in_this_cycle ]
1444 warn :: Located ModuleName -> WarnMsg
1447 (ptext SLIT("Warning: {-# SOURCE #-} unnecessary in import of ")
1448 <+> quotes (ppr mod))
1450 -----------------------------------------------------------------------------
1451 -- Downsweep (dependency analysis)
1453 -- Chase downwards from the specified root set, returning summaries
1454 -- for all home modules encountered. Only follow source-import
1457 -- We pass in the previous collection of summaries, which is used as a
1458 -- cache to avoid recalculating a module summary if the source is
1461 -- The returned list of [ModSummary] nodes has one node for each home-package
1462 -- module, plus one for any hs-boot files. The imports of these nodes
1463 -- are all there, including the imports of non-home-package modules.
1466 -> [ModSummary] -- Old summaries
1467 -> [ModuleName] -- Ignore dependencies on these; treat
1468 -- them as if they were package modules
1469 -> Bool -- True <=> allow multiple targets to have
1470 -- the same module name; this is
1471 -- very useful for ghc -M
1472 -> IO (Maybe [ModSummary])
1473 -- The elts of [ModSummary] all have distinct
1474 -- (Modules, IsBoot) identifiers, unless the Bool is true
1475 -- in which case there can be repeats
1476 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1477 = -- catch error messages and return them
1478 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1479 rootSummaries <- mapM getRootSummary roots
1480 let root_map = mkRootMap rootSummaries
1481 checkDuplicates root_map
1482 summs <- loop (concatMap msDeps rootSummaries) root_map
1485 roots = hsc_targets hsc_env
1487 old_summary_map :: NodeMap ModSummary
1488 old_summary_map = mkNodeMap old_summaries
1490 getRootSummary :: Target -> IO ModSummary
1491 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1492 = do exists <- doesFileExist file
1494 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1495 else throwDyn $ mkPlainErrMsg noSrcSpan $
1496 text "can't find file:" <+> text file
1497 getRootSummary (Target (TargetModule modl) maybe_buf)
1498 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1499 (L rootLoc modl) maybe_buf excl_mods
1500 case maybe_summary of
1501 Nothing -> packageModErr modl
1504 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1506 -- In a root module, the filename is allowed to diverge from the module
1507 -- name, so we have to check that there aren't multiple root files
1508 -- defining the same module (otherwise the duplicates will be silently
1509 -- ignored, leading to confusing behaviour).
1510 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1511 checkDuplicates root_map
1512 | allow_dup_roots = return ()
1513 | null dup_roots = return ()
1514 | otherwise = multiRootsErr (head dup_roots)
1516 dup_roots :: [[ModSummary]] -- Each at least of length 2
1517 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1519 loop :: [(Located ModuleName,IsBootInterface)]
1520 -- Work list: process these modules
1521 -> NodeMap [ModSummary]
1522 -- Visited set; the range is a list because
1523 -- the roots can have the same module names
1524 -- if allow_dup_roots is True
1526 -- The result includes the worklist, except
1527 -- for those mentioned in the visited set
1528 loop [] done = return (concat (nodeMapElts done))
1529 loop ((wanted_mod, is_boot) : ss) done
1530 | Just summs <- lookupFM done key
1531 = if isSingleton summs then
1534 do { multiRootsErr summs; return [] }
1535 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1536 is_boot wanted_mod Nothing excl_mods
1538 Nothing -> loop ss done
1539 Just s -> loop (msDeps s ++ ss)
1540 (addToFM done key [s]) }
1542 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1544 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1545 mkRootMap summaries = addListToFM_C (++) emptyFM
1546 [ (msKey s, [s]) | s <- summaries ]
1548 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1549 -- (msDeps s) returns the dependencies of the ModSummary s.
1550 -- A wrinkle is that for a {-# SOURCE #-} import we return
1551 -- *both* the hs-boot file
1552 -- *and* the source file
1553 -- as "dependencies". That ensures that the list of all relevant
1554 -- modules always contains B.hs if it contains B.hs-boot.
1555 -- Remember, this pass isn't doing the topological sort. It's
1556 -- just gathering the list of all relevant ModSummaries
1558 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1559 ++ [ (m,False) | m <- ms_imps s ]
1561 -----------------------------------------------------------------------------
1562 -- Summarising modules
1564 -- We have two types of summarisation:
1566 -- * Summarise a file. This is used for the root module(s) passed to
1567 -- cmLoadModules. The file is read, and used to determine the root
1568 -- module name. The module name may differ from the filename.
1570 -- * Summarise a module. We are given a module name, and must provide
1571 -- a summary. The finder is used to locate the file in which the module
1576 -> [ModSummary] -- old summaries
1577 -> FilePath -- source file name
1578 -> Maybe Phase -- start phase
1579 -> Maybe (StringBuffer,ClockTime)
1582 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1583 -- we can use a cached summary if one is available and the
1584 -- source file hasn't changed, But we have to look up the summary
1585 -- by source file, rather than module name as we do in summarise.
1586 | Just old_summary <- findSummaryBySourceFile old_summaries file
1588 let location = ms_location old_summary
1590 -- return the cached summary if the source didn't change
1591 src_timestamp <- case maybe_buf of
1592 Just (_,t) -> return t
1593 Nothing -> getModificationTime file
1594 -- The file exists; we checked in getRootSummary above.
1595 -- If it gets removed subsequently, then this
1596 -- getModificationTime may fail, but that's the right
1599 if ms_hs_date old_summary == src_timestamp
1600 then do -- update the object-file timestamp
1601 obj_timestamp <- getObjTimestamp location False
1602 return old_summary{ ms_obj_date = obj_timestamp }
1610 let dflags = hsc_dflags hsc_env
1612 (dflags', hspp_fn, buf)
1613 <- preprocessFile dflags file mb_phase maybe_buf
1615 (srcimps,the_imps, L _ mod_name) <- getImports dflags' buf hspp_fn file
1617 -- Make a ModLocation for this file
1618 location <- mkHomeModLocation dflags mod_name file
1620 -- Tell the Finder cache where it is, so that subsequent calls
1621 -- to findModule will find it, even if it's not on any search path
1622 mod <- addHomeModuleToFinder hsc_env mod_name location
1624 src_timestamp <- case maybe_buf of
1625 Just (_,t) -> return t
1626 Nothing -> getModificationTime file
1627 -- getMofificationTime may fail
1629 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1631 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1632 ms_location = location,
1633 ms_hspp_file = hspp_fn,
1634 ms_hspp_opts = dflags',
1635 ms_hspp_buf = Just buf,
1636 ms_srcimps = srcimps, ms_imps = the_imps,
1637 ms_hs_date = src_timestamp,
1638 ms_obj_date = obj_timestamp })
1640 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1641 findSummaryBySourceFile summaries file
1642 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1643 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
1647 -- Summarise a module, and pick up source and timestamp.
1650 -> NodeMap ModSummary -- Map of old summaries
1651 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1652 -> Located ModuleName -- Imported module to be summarised
1653 -> Maybe (StringBuffer, ClockTime)
1654 -> [ModuleName] -- Modules to exclude
1655 -> IO (Maybe ModSummary) -- Its new summary
1657 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1658 | wanted_mod `elem` excl_mods
1661 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1662 = do -- Find its new timestamp; all the
1663 -- ModSummaries in the old map have valid ml_hs_files
1664 let location = ms_location old_summary
1665 src_fn = expectJust "summariseModule" (ml_hs_file location)
1667 -- check the modification time on the source file, and
1668 -- return the cached summary if it hasn't changed. If the
1669 -- file has disappeared, we need to call the Finder again.
1671 Just (_,t) -> check_timestamp old_summary location src_fn t
1673 m <- System.IO.Error.try (getModificationTime src_fn)
1675 Right t -> check_timestamp old_summary location src_fn t
1676 Left e | isDoesNotExistError e -> find_it
1677 | otherwise -> ioError e
1679 | otherwise = find_it
1681 dflags = hsc_dflags hsc_env
1683 hsc_src = if is_boot then HsBootFile else HsSrcFile
1685 check_timestamp old_summary location src_fn src_timestamp
1686 | ms_hs_date old_summary == src_timestamp = do
1687 -- update the object-file timestamp
1688 obj_timestamp <- getObjTimestamp location is_boot
1689 return (Just old_summary{ ms_obj_date = obj_timestamp })
1691 -- source changed: re-summarise.
1692 new_summary location (ms_mod old_summary) src_fn src_timestamp
1695 -- Don't use the Finder's cache this time. If the module was
1696 -- previously a package module, it may have now appeared on the
1697 -- search path, so we want to consider it to be a home module. If
1698 -- the module was previously a home module, it may have moved.
1699 uncacheModule hsc_env wanted_mod
1700 found <- findImportedModule hsc_env wanted_mod Nothing
1703 | isJust (ml_hs_file location) ->
1705 just_found location mod
1707 -- Drop external-pkg
1708 ASSERT(modulePackageId mod /= thisPackage dflags)
1712 err -> noModError dflags loc wanted_mod err
1715 just_found location mod = do
1716 -- Adjust location to point to the hs-boot source file,
1717 -- hi file, object file, when is_boot says so
1718 let location' | is_boot = addBootSuffixLocn location
1719 | otherwise = location
1720 src_fn = expectJust "summarise2" (ml_hs_file location')
1722 -- Check that it exists
1723 -- It might have been deleted since the Finder last found it
1724 maybe_t <- modificationTimeIfExists src_fn
1726 Nothing -> noHsFileErr loc src_fn
1727 Just t -> new_summary location' mod src_fn t
1730 new_summary location mod src_fn src_timestamp
1732 -- Preprocess the source file and get its imports
1733 -- The dflags' contains the OPTIONS pragmas
1734 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1735 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn src_fn
1737 when (mod_name /= wanted_mod) $
1738 throwDyn $ mkPlainErrMsg mod_loc $
1739 text "file name does not match module name"
1740 <+> quotes (ppr mod_name)
1742 -- Find the object timestamp, and return the summary
1743 obj_timestamp <- getObjTimestamp location is_boot
1745 return (Just ( ModSummary { ms_mod = mod,
1746 ms_hsc_src = hsc_src,
1747 ms_location = location,
1748 ms_hspp_file = hspp_fn,
1749 ms_hspp_opts = dflags',
1750 ms_hspp_buf = Just buf,
1751 ms_srcimps = srcimps,
1753 ms_hs_date = src_timestamp,
1754 ms_obj_date = obj_timestamp }))
1757 getObjTimestamp :: ModLocation -> Bool -> IO (Maybe ClockTime)
1758 getObjTimestamp location is_boot
1759 = if is_boot then return Nothing
1760 else modificationTimeIfExists (ml_obj_file location)
1763 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1764 -> IO (DynFlags, FilePath, StringBuffer)
1765 preprocessFile dflags src_fn mb_phase Nothing
1767 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1768 buf <- hGetStringBuffer hspp_fn
1769 return (dflags', hspp_fn, buf)
1771 preprocessFile dflags src_fn mb_phase (Just (buf, _time))
1773 -- case we bypass the preprocessing stage?
1775 local_opts = getOptions buf src_fn
1777 (dflags', _errs) <- parseDynamicFlags dflags (map unLoc local_opts)
1778 -- XXX: shouldn't we be reporting the errors?
1782 | Just (Unlit _) <- mb_phase = True
1783 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1784 -- note: local_opts is only required if there's no Unlit phase
1785 | dopt Opt_Cpp dflags' = True
1786 | dopt Opt_Pp dflags' = True
1789 when needs_preprocessing $
1790 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1792 return (dflags', src_fn, buf)
1795 -----------------------------------------------------------------------------
1797 -----------------------------------------------------------------------------
1799 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
1800 -- ToDo: we don't have a proper line number for this error
1801 noModError dflags loc wanted_mod err
1802 = throwDyn $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
1804 noHsFileErr :: SrcSpan -> String -> a
1805 noHsFileErr loc path
1806 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1808 packageModErr :: ModuleName -> a
1810 = throwDyn $ mkPlainErrMsg noSrcSpan $
1811 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1813 multiRootsErr :: [ModSummary] -> IO ()
1814 multiRootsErr [] = panic "multiRootsErr"
1815 multiRootsErr summs@(summ1:_)
1816 = throwDyn $ mkPlainErrMsg noSrcSpan $
1817 text "module" <+> quotes (ppr mod) <+>
1818 text "is defined in multiple files:" <+>
1819 sep (map text files)
1822 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1824 cyclicModuleErr :: [ModSummary] -> SDoc
1826 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1827 2 (vcat (map show_one ms))
1829 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1830 nest 2 $ ptext SLIT("imports:") <+>
1831 (pp_imps HsBootFile (ms_srcimps ms)
1832 $$ pp_imps HsSrcFile (ms_imps ms))]
1833 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1834 pp_imps src mods = fsep (map (show_mod src) mods)
1837 -- | Inform GHC that the working directory has changed. GHC will flush
1838 -- its cache of module locations, since it may no longer be valid.
1839 -- Note: if you change the working directory, you should also unload
1840 -- the current program (set targets to empty, followed by load).
1841 workingDirectoryChanged :: Session -> IO ()
1842 workingDirectoryChanged s = withSession s $ flushFinderCaches
1844 -- -----------------------------------------------------------------------------
1845 -- inspecting the session
1847 -- | Get the module dependency graph.
1848 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1849 getModuleGraph s = withSession s (return . hsc_mod_graph)
1851 isLoaded :: Session -> ModuleName -> IO Bool
1852 isLoaded s m = withSession s $ \hsc_env ->
1853 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
1855 getBindings :: Session -> IO [TyThing]
1856 getBindings s = withSession s $ \hsc_env ->
1857 -- we have to implement the shadowing behaviour of ic_tmp_ids here
1858 -- (see InteractiveContext) and the quickest way is to use an OccEnv.
1860 tmp_ids = ic_tmp_ids (hsc_IC hsc_env)
1861 filtered = foldr f (const []) tmp_ids emptyUniqSet
1863 | uniq `elementOfUniqSet` set = rest set
1864 | otherwise = AnId id : rest (addOneToUniqSet set uniq)
1865 where uniq = getUnique (nameOccName (idName id))
1869 getPrintUnqual :: Session -> IO PrintUnqualified
1870 getPrintUnqual s = withSession s $ \hsc_env ->
1871 return (icPrintUnqual (hsc_dflags hsc_env) (hsc_IC hsc_env))
1873 -- | Container for information about a 'Module'.
1874 data ModuleInfo = ModuleInfo {
1875 minf_type_env :: TypeEnv,
1876 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
1877 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1878 minf_instances :: [Instance]
1880 ,minf_modBreaks :: ModBreaks
1882 -- ToDo: this should really contain the ModIface too
1884 -- We don't want HomeModInfo here, because a ModuleInfo applies
1885 -- to package modules too.
1887 -- | Request information about a loaded 'Module'
1888 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1889 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1890 let mg = hsc_mod_graph hsc_env
1891 if mdl `elem` map ms_mod mg
1892 then getHomeModuleInfo hsc_env (moduleName mdl)
1894 {- if isHomeModule (hsc_dflags hsc_env) mdl
1896 else -} getPackageModuleInfo hsc_env mdl
1897 -- getPackageModuleInfo will attempt to find the interface, so
1898 -- we don't want to call it for a home module, just in case there
1899 -- was a problem loading the module and the interface doesn't
1900 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1902 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1904 getPackageModuleInfo hsc_env mdl = do
1905 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
1907 Nothing -> return Nothing
1909 eps <- readIORef (hsc_EPS hsc_env)
1911 names = availsToNameSet avails
1913 tys = [ ty | name <- concatMap availNames avails,
1914 Just ty <- [lookupTypeEnv pte name] ]
1916 return (Just (ModuleInfo {
1917 minf_type_env = mkTypeEnv tys,
1918 minf_exports = names,
1919 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
1920 minf_instances = error "getModuleInfo: instances for package module unimplemented",
1921 minf_modBreaks = emptyModBreaks
1924 getPackageModuleInfo _hsc_env _mdl = do
1925 -- bogusly different for non-GHCI (ToDo)
1929 getHomeModuleInfo :: HscEnv -> ModuleName -> IO (Maybe ModuleInfo)
1930 getHomeModuleInfo hsc_env mdl =
1931 case lookupUFM (hsc_HPT hsc_env) mdl of
1932 Nothing -> return Nothing
1934 let details = hm_details hmi
1935 return (Just (ModuleInfo {
1936 minf_type_env = md_types details,
1937 minf_exports = availsToNameSet (md_exports details),
1938 minf_rdr_env = mi_globals $! hm_iface hmi,
1939 minf_instances = md_insts details
1941 ,minf_modBreaks = getModBreaks hmi
1945 -- | The list of top-level entities defined in a module
1946 modInfoTyThings :: ModuleInfo -> [TyThing]
1947 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1949 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1950 modInfoTopLevelScope minf
1951 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1953 modInfoExports :: ModuleInfo -> [Name]
1954 modInfoExports minf = nameSetToList $! minf_exports minf
1956 -- | Returns the instances defined by the specified module.
1957 -- Warning: currently unimplemented for package modules.
1958 modInfoInstances :: ModuleInfo -> [Instance]
1959 modInfoInstances = minf_instances
1961 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1962 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1964 mkPrintUnqualifiedForModule :: Session -> ModuleInfo -> IO (Maybe PrintUnqualified)
1965 mkPrintUnqualifiedForModule s minf = withSession s $ \hsc_env -> do
1966 return (fmap (mkPrintUnqualified (hsc_dflags hsc_env)) (minf_rdr_env minf))
1968 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1969 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1970 case lookupTypeEnv (minf_type_env minf) name of
1971 Just tyThing -> return (Just tyThing)
1973 eps <- readIORef (hsc_EPS hsc_env)
1974 return $! lookupType (hsc_dflags hsc_env)
1975 (hsc_HPT hsc_env) (eps_PTE eps) name
1978 modInfoModBreaks :: ModuleInfo -> ModBreaks
1979 modInfoModBreaks = minf_modBreaks
1982 isDictonaryId :: Id -> Bool
1984 = case tcSplitSigmaTy (idType id) of { (_tvs, _theta, tau) -> isDictTy tau }
1986 -- | Looks up a global name: that is, any top-level name in any
1987 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1988 -- the interactive context, and therefore does not require a preceding
1990 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1991 lookupGlobalName s name = withSession s $ \hsc_env -> do
1992 eps <- readIORef (hsc_EPS hsc_env)
1993 return $! lookupType (hsc_dflags hsc_env)
1994 (hsc_HPT hsc_env) (eps_PTE eps) name
1996 -- -----------------------------------------------------------------------------
1997 -- Misc exported utils
1999 dataConType :: DataCon -> Type
2000 dataConType dc = idType (dataConWrapId dc)
2002 -- | print a 'NamedThing', adding parentheses if the name is an operator.
2003 pprParenSymName :: NamedThing a => a -> SDoc
2004 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
2006 -- ----------------------------------------------------------------------------
2011 -- - Data and Typeable instances for HsSyn.
2013 -- ToDo: check for small transformations that happen to the syntax in
2014 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
2016 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
2017 -- to get from TyCons, Ids etc. to TH syntax (reify).
2019 -- :browse will use either lm_toplev or inspect lm_interface, depending
2020 -- on whether the module is interpreted or not.
2022 -- This is for reconstructing refactored source code
2023 -- Calls the lexer repeatedly.
2024 -- ToDo: add comment tokens to token stream
2025 getTokenStream :: Session -> Module -> IO [Located Token]
2028 -- -----------------------------------------------------------------------------
2029 -- Interactive evaluation
2031 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
2032 -- filesystem and package database to find the corresponding 'Module',
2033 -- using the algorithm that is used for an @import@ declaration.
2034 findModule :: Session -> ModuleName -> Maybe PackageId -> IO Module
2035 findModule s mod_name maybe_pkg = withSession s $ \hsc_env ->
2037 dflags = hsc_dflags hsc_env
2038 hpt = hsc_HPT hsc_env
2039 this_pkg = thisPackage dflags
2041 case lookupUFM hpt mod_name of
2042 Just mod_info -> return (mi_module (hm_iface mod_info))
2043 _not_a_home_module -> do
2044 res <- findImportedModule hsc_env mod_name maybe_pkg
2046 Found _ m | modulePackageId m /= this_pkg -> return m
2047 | otherwise -> throwDyn (CmdLineError (showSDoc $
2048 text "module" <+> pprModule m <+>
2049 text "is not loaded"))
2050 err -> let msg = cannotFindModule dflags mod_name err in
2051 throwDyn (CmdLineError (showSDoc msg))
2054 getHistorySpan :: Session -> History -> IO SrcSpan
2055 getHistorySpan sess h = withSession sess $ \hsc_env ->
2056 return$ InteractiveEval.getHistorySpan hsc_env h
2058 obtainTerm :: Session -> Bool -> Id -> IO Term
2059 obtainTerm sess force id = withSession sess $ \hsc_env ->
2060 InteractiveEval.obtainTerm hsc_env force id
2062 obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term
2063 obtainTerm1 sess force mb_ty a = withSession sess $ \hsc_env ->
2064 InteractiveEval.obtainTerm1 hsc_env force mb_ty a
2066 obtainTermB :: Session -> Int -> Bool -> Id -> IO Term
2067 obtainTermB sess bound force id = withSession sess $ \hsc_env ->
2068 InteractiveEval.obtainTermB hsc_env bound force id