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,
44 compileToCore, compileToCoreModule,
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, 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,
250 import Bag ( unitBag, listToBag )
251 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
252 mkPlainErrMsg, printBagOfErrors, printBagOfWarnings,
254 import qualified ErrUtils
256 import StringBuffer ( StringBuffer, hGetStringBuffer )
259 import Maybes ( expectJust, mapCatMaybes )
261 import HaddockLex ( tokenise )
263 import Control.Concurrent
264 import System.Directory ( getModificationTime, doesFileExist )
267 import qualified Data.List as List
269 import System.Exit ( exitWith, ExitCode(..) )
270 import System.Time ( ClockTime )
271 import Control.Exception as Exception hiding (handle)
274 import System.IO.Error ( try, isDoesNotExistError )
275 import Prelude hiding (init)
278 -- -----------------------------------------------------------------------------
279 -- Exception handlers
281 -- | Install some default exception handlers and run the inner computation.
282 -- Unless you want to handle exceptions yourself, you should wrap this around
283 -- the top level of your program. The default handlers output the error
284 -- message(s) to stderr and exit cleanly.
285 defaultErrorHandler :: DynFlags -> IO a -> IO a
286 defaultErrorHandler dflags inner =
287 -- top-level exception handler: any unrecognised exception is a compiler bug.
288 handle (\exception -> do
291 -- an IO exception probably isn't our fault, so don't panic
293 fatalErrorMsg dflags (text (show exception))
294 AsyncException StackOverflow ->
295 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
297 fatalErrorMsg dflags (text (show (Panic (show exception))))
298 exitWith (ExitFailure 1)
301 -- program errors: messages with locations attached. Sometimes it is
302 -- convenient to just throw these as exceptions.
303 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
304 exitWith (ExitFailure 1)) $
306 -- error messages propagated as exceptions
307 handleDyn (\dyn -> do
310 PhaseFailed _ code -> exitWith code
311 Interrupted -> exitWith (ExitFailure 1)
312 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
313 exitWith (ExitFailure 1)
317 -- | Install a default cleanup handler to remove temporary files
318 -- deposited by a GHC run. This is seperate from
319 -- 'defaultErrorHandler', because you might want to override the error
320 -- handling, but still get the ordinary cleanup behaviour.
321 defaultCleanupHandler :: DynFlags -> IO a -> IO a
322 defaultCleanupHandler dflags inner =
323 -- make sure we clean up after ourselves
324 later (do cleanTempFiles dflags
327 -- exceptions will be blocked while we clean the temporary files,
328 -- so there shouldn't be any difficulty if we receive further
333 -- | Starts a new session. A session consists of a set of loaded
334 -- modules, a set of options (DynFlags), and an interactive context.
335 newSession :: Maybe FilePath -> IO Session
336 newSession mb_top_dir = do
338 main_thread <- myThreadId
339 modifyMVar_ interruptTargetThread (return . (main_thread :))
340 installSignalHandlers
343 dflags0 <- initSysTools mb_top_dir defaultDynFlags
344 dflags <- initDynFlags dflags0
345 env <- newHscEnv dflags
349 -- tmp: this breaks the abstraction, but required because DriverMkDepend
350 -- needs to call the Finder. ToDo: untangle this.
351 sessionHscEnv :: Session -> IO HscEnv
352 sessionHscEnv (Session ref) = readIORef ref
354 -- -----------------------------------------------------------------------------
357 -- | Grabs the DynFlags from the Session
358 getSessionDynFlags :: Session -> IO DynFlags
359 getSessionDynFlags s = withSession s (return . hsc_dflags)
361 -- | Updates the DynFlags in a Session. This also reads
362 -- the package database (unless it has already been read),
363 -- and prepares the compilers knowledge about packages. It
364 -- can be called again to load new packages: just add new
365 -- package flags to (packageFlags dflags).
367 -- Returns a list of new packages that may need to be linked in using
368 -- the dynamic linker (see 'linkPackages') as a result of new package
369 -- flags. If you are not doing linking or doing static linking, you
370 -- can ignore the list of packages returned.
372 setSessionDynFlags :: Session -> DynFlags -> IO [PackageId]
373 setSessionDynFlags (Session ref) dflags = do
374 hsc_env <- readIORef ref
375 (dflags', preload) <- initPackages dflags
376 writeIORef ref $! hsc_env{ hsc_dflags = dflags' }
379 -- | If there is no -o option, guess the name of target executable
380 -- by using top-level source file name as a base.
381 guessOutputFile :: Session -> IO ()
382 guessOutputFile s = modifySession s $ \env ->
383 let dflags = hsc_dflags env
384 mod_graph = hsc_mod_graph env
385 mainModuleSrcPath, guessedName :: Maybe String
386 mainModuleSrcPath = do
387 let isMain = (== mainModIs dflags) . ms_mod
388 [ms] <- return (filter isMain mod_graph)
389 ml_hs_file (ms_location ms)
390 guessedName = fmap basenameOf mainModuleSrcPath
392 case outputFile dflags of
394 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
396 -- -----------------------------------------------------------------------------
399 -- ToDo: think about relative vs. absolute file paths. And what
400 -- happens when the current directory changes.
402 -- | Sets the targets for this session. Each target may be a module name
403 -- or a filename. The targets correspond to the set of root modules for
404 -- the program\/library. Unloading the current program is achieved by
405 -- setting the current set of targets to be empty, followed by load.
406 setTargets :: Session -> [Target] -> IO ()
407 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
409 -- | returns the current set of targets
410 getTargets :: Session -> IO [Target]
411 getTargets s = withSession s (return . hsc_targets)
413 -- | Add another target
414 addTarget :: Session -> Target -> IO ()
416 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
419 removeTarget :: Session -> TargetId -> IO ()
420 removeTarget s target_id
421 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
423 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
425 -- Attempts to guess what Target a string refers to. This function implements
426 -- the --make/GHCi command-line syntax for filenames:
428 -- - if the string looks like a Haskell source filename, then interpret
430 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
432 -- - otherwise interpret the string as a module name
434 guessTarget :: String -> Maybe Phase -> IO Target
435 guessTarget file (Just phase)
436 = return (Target (TargetFile file (Just phase)) Nothing)
437 guessTarget file Nothing
438 | isHaskellSrcFilename file
439 = return (Target (TargetFile file Nothing) Nothing)
441 = do exists <- doesFileExist hs_file
443 then return (Target (TargetFile hs_file Nothing) Nothing)
445 exists <- doesFileExist lhs_file
447 then return (Target (TargetFile lhs_file Nothing) Nothing)
449 return (Target (TargetModule (mkModuleName file)) Nothing)
451 hs_file = file `joinFileExt` "hs"
452 lhs_file = file `joinFileExt` "lhs"
454 -- -----------------------------------------------------------------------------
455 -- Extending the program scope
457 extendGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
458 extendGlobalRdrScope session rdrElts
459 = modifySession session $ \hscEnv ->
460 let global_rdr = hsc_global_rdr_env hscEnv
461 in hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv global_rdr rdrElts }
463 setGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
464 setGlobalRdrScope session rdrElts
465 = modifySession session $ \hscEnv ->
466 hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv emptyGlobalRdrEnv rdrElts }
468 extendGlobalTypeScope :: Session -> [Id] -> IO ()
469 extendGlobalTypeScope session ids
470 = modifySession session $ \hscEnv ->
471 let global_type = hsc_global_type_env hscEnv
472 in hscEnv{ hsc_global_type_env = extendTypeEnvWithIds global_type ids }
474 setGlobalTypeScope :: Session -> [Id] -> IO ()
475 setGlobalTypeScope session ids
476 = modifySession session $ \hscEnv ->
477 hscEnv{ hsc_global_type_env = extendTypeEnvWithIds emptyTypeEnv ids }
479 -- -----------------------------------------------------------------------------
480 -- Parsing Haddock comments
482 parseHaddockComment :: String -> Either String (HsDoc RdrName)
483 parseHaddockComment string = parseHaddockParagraphs (tokenise string)
485 -- -----------------------------------------------------------------------------
486 -- Loading the program
488 -- Perform a dependency analysis starting from the current targets
489 -- and update the session with the new module graph.
490 depanal :: Session -> [ModuleName] -> Bool -> IO (Maybe ModuleGraph)
491 depanal (Session ref) excluded_mods allow_dup_roots = do
492 hsc_env <- readIORef ref
494 dflags = hsc_dflags hsc_env
495 targets = hsc_targets hsc_env
496 old_graph = hsc_mod_graph hsc_env
498 showPass dflags "Chasing dependencies"
499 debugTraceMsg dflags 2 (hcat [
500 text "Chasing modules from: ",
501 hcat (punctuate comma (map pprTarget targets))])
503 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
505 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
510 -- | The result of load.
512 = LoadOk Errors -- ^ all specified targets were loaded successfully.
513 | LoadFailed Errors -- ^ not all modules were loaded.
515 type Errors = [String]
517 data ErrMsg = ErrMsg {
518 errMsgSeverity :: Severity, -- warning, error, etc.
519 errMsgSpans :: [SrcSpan],
520 errMsgShortDoc :: Doc,
521 errMsgExtraInfo :: Doc
527 | LoadUpTo ModuleName
528 | LoadDependenciesOf ModuleName
530 -- | Try to load the program. If a Module is supplied, then just
531 -- attempt to load up to this target. If no Module is supplied,
532 -- then try to load all targets.
533 load :: Session -> LoadHowMuch -> IO SuccessFlag
534 load s@(Session ref) how_much
536 -- Dependency analysis first. Note that this fixes the module graph:
537 -- even if we don't get a fully successful upsweep, the full module
538 -- graph is still retained in the Session. We can tell which modules
539 -- were successfully loaded by inspecting the Session's HPT.
540 mb_graph <- depanal s [] False
542 Just mod_graph -> catchingFailure $ load2 s how_much mod_graph
543 Nothing -> return Failed
544 where catchingFailure f = f `Exception.catch` \e -> do
545 hsc_env <- readIORef ref
546 -- trac #1565 / test ghci021:
547 -- let bindings may explode if we try to use them after
549 writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
552 load2 :: Session -> LoadHowMuch -> [ModSummary] -> IO SuccessFlag
553 load2 s@(Session ref) how_much mod_graph = do
555 hsc_env <- readIORef ref
557 let hpt1 = hsc_HPT hsc_env
558 let dflags = hsc_dflags hsc_env
560 -- The "bad" boot modules are the ones for which we have
561 -- B.hs-boot in the module graph, but no B.hs
562 -- The downsweep should have ensured this does not happen
564 let all_home_mods = [ms_mod_name s
565 | s <- mod_graph, not (isBootSummary s)]
566 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
567 not (ms_mod_name s `elem` all_home_mods)]
568 ASSERT( null bad_boot_mods ) return ()
570 -- mg2_with_srcimps drops the hi-boot nodes, returning a
571 -- graph with cycles. Among other things, it is used for
572 -- backing out partially complete cycles following a failed
573 -- upsweep, and for removing from hpt all the modules
574 -- not in strict downwards closure, during calls to compile.
575 let mg2_with_srcimps :: [SCC ModSummary]
576 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
578 -- If we can determine that any of the {-# SOURCE #-} imports
579 -- are definitely unnecessary, then emit a warning.
580 warnUnnecessarySourceImports dflags mg2_with_srcimps
583 -- check the stability property for each module.
584 stable_mods@(stable_obj,stable_bco)
585 = checkStability hpt1 mg2_with_srcimps all_home_mods
587 -- prune bits of the HPT which are definitely redundant now,
589 pruned_hpt = pruneHomePackageTable hpt1
590 (flattenSCCs mg2_with_srcimps)
595 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
596 text "Stable BCO:" <+> ppr stable_bco)
598 -- Unload any modules which are going to be re-linked this time around.
599 let stable_linkables = [ linkable
600 | m <- stable_obj++stable_bco,
601 Just hmi <- [lookupUFM pruned_hpt m],
602 Just linkable <- [hm_linkable hmi] ]
603 unload hsc_env stable_linkables
605 -- We could at this point detect cycles which aren't broken by
606 -- a source-import, and complain immediately, but it seems better
607 -- to let upsweep_mods do this, so at least some useful work gets
608 -- done before the upsweep is abandoned.
609 --hPutStrLn stderr "after tsort:\n"
610 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
612 -- Now do the upsweep, calling compile for each module in
613 -- turn. Final result is version 3 of everything.
615 -- Topologically sort the module graph, this time including hi-boot
616 -- nodes, and possibly just including the portion of the graph
617 -- reachable from the module specified in the 2nd argument to load.
618 -- This graph should be cycle-free.
619 -- If we're restricting the upsweep to a portion of the graph, we
620 -- also want to retain everything that is still stable.
621 let full_mg :: [SCC ModSummary]
622 full_mg = topSortModuleGraph False mod_graph Nothing
624 maybe_top_mod = case how_much of
626 LoadDependenciesOf m -> Just m
629 partial_mg0 :: [SCC ModSummary]
630 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
632 -- LoadDependenciesOf m: we want the upsweep to stop just
633 -- short of the specified module (unless the specified module
636 | LoadDependenciesOf _mod <- how_much
637 = ASSERT( case last partial_mg0 of
638 AcyclicSCC ms -> ms_mod_name ms == _mod; _ -> False )
639 List.init partial_mg0
645 | AcyclicSCC ms <- full_mg,
646 ms_mod_name ms `elem` stable_obj++stable_bco,
647 ms_mod_name ms `notElem` [ ms_mod_name ms' |
648 AcyclicSCC ms' <- partial_mg ] ]
650 mg = stable_mg ++ partial_mg
652 -- clean up between compilations
653 let cleanup = cleanTempFilesExcept dflags
654 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
656 debugTraceMsg dflags 2 (hang (text "Ready for upsweep")
658 (upsweep_ok, hsc_env1, modsUpswept)
659 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
660 pruned_hpt stable_mods cleanup mg
662 -- Make modsDone be the summaries for each home module now
663 -- available; this should equal the domain of hpt3.
664 -- Get in in a roughly top .. bottom order (hence reverse).
666 let modsDone = reverse modsUpswept
668 -- Try and do linking in some form, depending on whether the
669 -- upsweep was completely or only partially successful.
671 if succeeded upsweep_ok
674 -- Easy; just relink it all.
675 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
677 -- Clean up after ourselves
678 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
680 -- Issue a warning for the confusing case where the user
681 -- said '-o foo' but we're not going to do any linking.
682 -- We attempt linking if either (a) one of the modules is
683 -- called Main, or (b) the user said -no-hs-main, indicating
684 -- that main() is going to come from somewhere else.
686 let ofile = outputFile dflags
687 let no_hs_main = dopt Opt_NoHsMain dflags
689 main_mod = mainModIs dflags
690 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
691 do_linking = a_root_is_Main || no_hs_main
693 when (ghcLink dflags == LinkBinary
694 && isJust ofile && not do_linking) $
695 debugTraceMsg dflags 1 $
696 text ("Warning: output was redirected with -o, " ++
697 "but no output will be generated\n" ++
698 "because there is no " ++
699 moduleNameString (moduleName main_mod) ++ " module.")
701 -- link everything together
702 linkresult <- link (ghcLink dflags) dflags do_linking (hsc_HPT hsc_env1)
704 loadFinish Succeeded linkresult ref hsc_env1
707 -- Tricky. We need to back out the effects of compiling any
708 -- half-done cycles, both so as to clean up the top level envs
709 -- and to avoid telling the interactive linker to link them.
710 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
713 = map ms_mod modsDone
714 let mods_to_zap_names
715 = findPartiallyCompletedCycles modsDone_names
718 = filter ((`notElem` mods_to_zap_names).ms_mod)
721 let hpt4 = retainInTopLevelEnvs (map ms_mod_name mods_to_keep)
724 -- Clean up after ourselves
725 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
727 -- there should be no Nothings where linkables should be, now
728 ASSERT(all (isJust.hm_linkable)
729 (eltsUFM (hsc_HPT hsc_env))) do
731 -- Link everything together
732 linkresult <- link (ghcLink dflags) dflags False hpt4
734 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
735 loadFinish Failed linkresult ref hsc_env4
737 -- Finish up after a load.
739 -- If the link failed, unload everything and return.
740 loadFinish :: SuccessFlag -> SuccessFlag -> IORef HscEnv -> HscEnv -> IO SuccessFlag
741 loadFinish _all_ok Failed ref hsc_env
742 = do unload hsc_env []
743 writeIORef ref $! discardProg hsc_env
746 -- Empty the interactive context and set the module context to the topmost
747 -- newly loaded module, or the Prelude if none were loaded.
748 loadFinish all_ok Succeeded ref hsc_env
749 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
753 -- Forget the current program, but retain the persistent info in HscEnv
754 discardProg :: HscEnv -> HscEnv
756 = hsc_env { hsc_mod_graph = emptyMG,
757 hsc_IC = emptyInteractiveContext,
758 hsc_HPT = emptyHomePackageTable }
760 -- used to fish out the preprocess output files for the purposes of
761 -- cleaning up. The preprocessed file *might* be the same as the
762 -- source file, but that doesn't do any harm.
763 ppFilesFromSummaries :: [ModSummary] -> [FilePath]
764 ppFilesFromSummaries summaries = map ms_hspp_file summaries
766 -- -----------------------------------------------------------------------------
770 CheckedModule { parsedSource :: ParsedSource,
771 renamedSource :: Maybe RenamedSource,
772 typecheckedSource :: Maybe TypecheckedSource,
773 checkedModuleInfo :: Maybe ModuleInfo,
774 coreModule :: Maybe CoreModule
776 -- ToDo: improvements that could be made here:
777 -- if the module succeeded renaming but not typechecking,
778 -- we can still get back the GlobalRdrEnv and exports, so
779 -- perhaps the ModuleInfo should be split up into separate
780 -- fields within CheckedModule.
782 type ParsedSource = Located (HsModule RdrName)
783 type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
784 Maybe (HsDoc Name), HaddockModInfo Name)
785 type TypecheckedSource = LHsBinds Id
788 -- - things that aren't in the output of the typechecker right now:
792 -- - type/data/newtype declarations
793 -- - class declarations
795 -- - extra things in the typechecker's output:
796 -- - default methods are turned into top-level decls.
797 -- - dictionary bindings
800 -- | This is the way to get access to parsed and typechecked source code
801 -- for a module. 'checkModule' attempts to typecheck the module. If
802 -- successful, it returns the abstract syntax for the module.
803 -- If compileToCore is true, it also desugars the module and returns the
804 -- resulting Core bindings as a component of the CheckedModule.
805 checkModule :: Session -> ModuleName -> Bool -> IO (Maybe CheckedModule)
806 checkModule (Session ref) mod compileToCore = do
807 -- parse & typecheck the module
808 hsc_env <- readIORef ref
809 let mg = hsc_mod_graph hsc_env
810 case [ ms | ms <- mg, ms_mod_name ms == mod ] of
813 mbChecked <- hscFileCheck
814 hsc_env{hsc_dflags=ms_hspp_opts ms}
817 Nothing -> return Nothing
818 Just (HscChecked parsed renamed Nothing _) ->
819 return (Just (CheckedModule {
820 parsedSource = parsed,
821 renamedSource = renamed,
822 typecheckedSource = Nothing,
823 checkedModuleInfo = Nothing,
824 coreModule = Nothing }))
825 Just (HscChecked parsed renamed
826 (Just (tc_binds, rdr_env, details))
827 maybeCoreBinds) -> do
828 let minf = ModuleInfo {
829 minf_type_env = md_types details,
830 minf_exports = availsToNameSet $
832 minf_rdr_env = Just rdr_env,
833 minf_instances = md_insts details
835 ,minf_modBreaks = emptyModBreaks
838 return (Just (CheckedModule {
839 parsedSource = parsed,
840 renamedSource = renamed,
841 typecheckedSource = Just tc_binds,
842 checkedModuleInfo = Just minf,
843 coreModule = maybeCoreBinds}))
845 -- | This is the way to get access to the Core bindings corresponding
846 -- to a module. 'compileToCore' invokes 'checkModule' to parse, typecheck, and
847 -- desugar the module, then returns the resulting Core module (consisting of
848 -- the module name, type declarations, and function declarations) if
850 compileToCoreModule :: Session -> FilePath -> IO (Maybe CoreModule)
851 compileToCoreModule 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 case find ((== fn) . msHsFilePath) modGraph of
862 Just modSummary -> do
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 $ coreModule checkedMod
870 Nothing -> panic "compileToCoreModule: target FilePath not found in\
871 module dependency graph"
873 -- | Provided for backwards-compatibility: compileToCore returns just the Core
874 -- bindings, but for most purposes, you probably want to call
875 -- compileToCoreModule.
876 compileToCore :: Session -> FilePath -> IO (Maybe [CoreBind])
877 compileToCore session fn = do
878 maybeCoreModule <- compileToCoreModule session fn
879 return $ fmap cm_binds maybeCoreModule
880 -- ---------------------------------------------------------------------------
883 unload :: HscEnv -> [Linkable] -> IO ()
884 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
885 = case ghcLink (hsc_dflags hsc_env) of
887 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
889 LinkInMemory -> panic "unload: no interpreter"
890 -- urgh. avoid warnings:
891 hsc_env stable_linkables
895 -- -----------------------------------------------------------------------------
899 Stability tells us which modules definitely do not need to be recompiled.
900 There are two main reasons for having stability:
902 - avoid doing a complete upsweep of the module graph in GHCi when
903 modules near the bottom of the tree have not changed.
905 - to tell GHCi when it can load object code: we can only load object code
906 for a module when we also load object code fo all of the imports of the
907 module. So we need to know that we will definitely not be recompiling
908 any of these modules, and we can use the object code.
910 The stability check is as follows. Both stableObject and
911 stableBCO are used during the upsweep phase later.
914 stable m = stableObject m || stableBCO m
917 all stableObject (imports m)
918 && old linkable does not exist, or is == on-disk .o
919 && date(on-disk .o) > date(.hs)
922 all stable (imports m)
923 && date(BCO) > date(.hs)
926 These properties embody the following ideas:
928 - if a module is stable, then:
929 - if it has been compiled in a previous pass (present in HPT)
930 then it does not need to be compiled or re-linked.
931 - if it has not been compiled in a previous pass,
932 then we only need to read its .hi file from disk and
933 link it to produce a ModDetails.
935 - if a modules is not stable, we will definitely be at least
936 re-linking, and possibly re-compiling it during the upsweep.
937 All non-stable modules can (and should) therefore be unlinked
940 - Note that objects are only considered stable if they only depend
941 on other objects. We can't link object code against byte code.
945 :: HomePackageTable -- HPT from last compilation
946 -> [SCC ModSummary] -- current module graph (cyclic)
947 -> [ModuleName] -- all home modules
948 -> ([ModuleName], -- stableObject
949 [ModuleName]) -- stableBCO
951 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
953 checkSCC (stable_obj, stable_bco) scc0
954 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
955 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
956 | otherwise = (stable_obj, stable_bco)
958 scc = flattenSCC scc0
959 scc_mods = map ms_mod_name scc
960 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
962 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
963 -- all imports outside the current SCC, but in the home pkg
965 stable_obj_imps = map (`elem` stable_obj) scc_allimps
966 stable_bco_imps = map (`elem` stable_bco) scc_allimps
973 and (zipWith (||) stable_obj_imps stable_bco_imps)
977 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
981 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
982 Just hmi | Just l <- hm_linkable hmi
983 -> isObjectLinkable l && t == linkableTime l
985 -- why '>=' rather than '>' above? If the filesystem stores
986 -- times to the nearset second, we may occasionally find that
987 -- the object & source have the same modification time,
988 -- especially if the source was automatically generated
989 -- and compiled. Using >= is slightly unsafe, but it matches
993 = case lookupUFM hpt (ms_mod_name ms) of
994 Just hmi | Just l <- hm_linkable hmi ->
995 not (isObjectLinkable l) &&
996 linkableTime l >= ms_hs_date ms
999 ms_allimps :: ModSummary -> [ModuleName]
1000 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
1002 -- -----------------------------------------------------------------------------
1003 -- Prune the HomePackageTable
1005 -- Before doing an upsweep, we can throw away:
1007 -- - For non-stable modules:
1008 -- - all ModDetails, all linked code
1009 -- - all unlinked code that is out of date with respect to
1012 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
1013 -- space at the end of the upsweep, because the topmost ModDetails of the
1014 -- old HPT holds on to the entire type environment from the previous
1017 pruneHomePackageTable
1020 -> ([ModuleName],[ModuleName])
1023 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
1026 | is_stable modl = hmi'
1027 | otherwise = hmi'{ hm_details = emptyModDetails }
1029 modl = moduleName (mi_module (hm_iface hmi))
1030 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
1031 = hmi{ hm_linkable = Nothing }
1034 where ms = expectJust "prune" (lookupUFM ms_map modl)
1036 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
1038 is_stable m = m `elem` stable_obj || m `elem` stable_bco
1040 -- -----------------------------------------------------------------------------
1042 -- Return (names of) all those in modsDone who are part of a cycle
1043 -- as defined by theGraph.
1044 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1045 findPartiallyCompletedCycles modsDone theGraph
1049 chew ((AcyclicSCC _):rest) = chew rest -- acyclic? not interesting.
1050 chew ((CyclicSCC vs):rest)
1051 = let names_in_this_cycle = nub (map ms_mod vs)
1053 = nub ([done | done <- modsDone,
1054 done `elem` names_in_this_cycle])
1055 chewed_rest = chew rest
1057 if notNull mods_in_this_cycle
1058 && length mods_in_this_cycle < length names_in_this_cycle
1059 then mods_in_this_cycle ++ chewed_rest
1062 -- -----------------------------------------------------------------------------
1065 -- This is where we compile each module in the module graph, in a pass
1066 -- from the bottom to the top of the graph.
1068 -- There better had not be any cyclic groups here -- we check for them.
1071 :: HscEnv -- Includes initially-empty HPT
1072 -> HomePackageTable -- HPT from last time round (pruned)
1073 -> ([ModuleName],[ModuleName]) -- stable modules (see checkStability)
1074 -> IO () -- How to clean up unwanted tmp files
1075 -> [SCC ModSummary] -- Mods to do (the worklist)
1077 HscEnv, -- With an updated HPT
1078 [ModSummary]) -- Mods which succeeded
1080 upsweep hsc_env old_hpt stable_mods cleanup sccs = do
1081 (res, hsc_env, done) <- upsweep' hsc_env old_hpt [] sccs 1 (length sccs)
1082 return (res, hsc_env, reverse done)
1085 upsweep' hsc_env _old_hpt done
1087 = return (Succeeded, hsc_env, done)
1089 upsweep' hsc_env _old_hpt done
1090 (CyclicSCC ms:_) _ _
1091 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1092 return (Failed, hsc_env, done)
1094 upsweep' hsc_env old_hpt done
1095 (AcyclicSCC mod:mods) mod_index nmods
1096 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1097 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1098 -- (moduleEnvElts (hsc_HPT hsc_env)))
1100 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1103 cleanup -- Remove unwanted tmp files between compilations
1106 Nothing -> return (Failed, hsc_env, [])
1108 let this_mod = ms_mod_name mod
1110 -- Add new info to hsc_env
1111 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1112 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1114 -- Space-saving: delete the old HPT entry
1115 -- for mod BUT if mod is a hs-boot
1116 -- node, don't delete it. For the
1117 -- interface, the HPT entry is probaby for the
1118 -- main Haskell source file. Deleting it
1119 -- would force the real module to be recompiled
1121 old_hpt1 | isBootSummary mod = old_hpt
1122 | otherwise = delFromUFM old_hpt this_mod
1126 -- fixup our HomePackageTable after we've finished compiling
1127 -- a mutually-recursive loop. See reTypecheckLoop, below.
1128 hsc_env2 <- reTypecheckLoop hsc_env1 mod done'
1130 upsweep' hsc_env2 old_hpt1 done' mods (mod_index+1) nmods
1133 -- Compile a single module. Always produce a Linkable for it if
1134 -- successful. If no compilation happened, return the old Linkable.
1135 upsweep_mod :: HscEnv
1137 -> ([ModuleName],[ModuleName])
1139 -> Int -- index of module
1140 -> Int -- total number of modules
1141 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1143 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1145 this_mod_name = ms_mod_name summary
1146 this_mod = ms_mod summary
1147 mb_obj_date = ms_obj_date summary
1148 obj_fn = ml_obj_file (ms_location summary)
1149 hs_date = ms_hs_date summary
1151 is_stable_obj = this_mod_name `elem` stable_obj
1152 is_stable_bco = this_mod_name `elem` stable_bco
1154 old_hmi = lookupUFM old_hpt this_mod_name
1156 -- We're using the dflags for this module now, obtained by
1157 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1158 dflags = ms_hspp_opts summary
1159 prevailing_target = hscTarget (hsc_dflags hsc_env)
1160 local_target = hscTarget dflags
1162 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1163 -- we don't do anything dodgy: these should only work to change
1164 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1165 -- end up trying to link object code to byte code.
1166 target = if prevailing_target /= local_target
1167 && (not (isObjectTarget prevailing_target)
1168 || not (isObjectTarget local_target))
1169 then prevailing_target
1172 -- store the corrected hscTarget into the summary
1173 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1175 -- The old interface is ok if
1176 -- a) we're compiling a source file, and the old HPT
1177 -- entry is for a source file
1178 -- b) we're compiling a hs-boot file
1179 -- Case (b) allows an hs-boot file to get the interface of its
1180 -- real source file on the second iteration of the compilation
1181 -- manager, but that does no harm. Otherwise the hs-boot file
1182 -- will always be recompiled
1187 Just hm_info | isBootSummary summary -> Just iface
1188 | not (mi_boot iface) -> Just iface
1189 | otherwise -> Nothing
1191 iface = hm_iface hm_info
1193 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1194 compile_it = compile hsc_env summary' mod_index nmods mb_old_iface
1196 compile_it_discard_iface
1197 = compile hsc_env summary' mod_index nmods Nothing
1203 -- Regardless of whether we're generating object code or
1204 -- byte code, we can always use an existing object file
1205 -- if it is *stable* (see checkStability).
1206 | is_stable_obj, isJust old_hmi ->
1208 -- object is stable, and we have an entry in the
1209 -- old HPT: nothing to do
1211 | is_stable_obj, isNothing old_hmi -> do
1212 linkable <- findObjectLinkable this_mod obj_fn
1213 (expectJust "upseep1" mb_obj_date)
1214 compile_it (Just linkable)
1215 -- object is stable, but we need to load the interface
1216 -- off disk to make a HMI.
1220 ASSERT(isJust old_hmi) -- must be in the old_hpt
1222 -- BCO is stable: nothing to do
1224 | Just hmi <- old_hmi,
1225 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1226 linkableTime l >= ms_hs_date summary ->
1228 -- we have an old BCO that is up to date with respect
1229 -- to the source: do a recompilation check as normal.
1233 -- no existing code at all: we must recompile.
1235 -- When generating object code, if there's an up-to-date
1236 -- object file on the disk, then we can use it.
1237 -- However, if the object file is new (compared to any
1238 -- linkable we had from a previous compilation), then we
1239 -- must discard any in-memory interface, because this
1240 -- means the user has compiled the source file
1241 -- separately and generated a new interface, that we must
1242 -- read from the disk.
1244 obj | isObjectTarget obj,
1245 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1248 | Just l <- hm_linkable hmi,
1249 isObjectLinkable l && linkableTime l == obj_date
1250 -> compile_it (Just l)
1252 linkable <- findObjectLinkable this_mod obj_fn obj_date
1253 compile_it_discard_iface (Just linkable)
1260 -- Filter modules in the HPT
1261 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1262 retainInTopLevelEnvs keep_these hpt
1263 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1265 , let mb_mod_info = lookupUFM hpt mod
1266 , isJust mb_mod_info ]
1268 -- ---------------------------------------------------------------------------
1269 -- Typecheck module loops
1272 See bug #930. This code fixes a long-standing bug in --make. The
1273 problem is that when compiling the modules *inside* a loop, a data
1274 type that is only defined at the top of the loop looks opaque; but
1275 after the loop is done, the structure of the data type becomes
1278 The difficulty is then that two different bits of code have
1279 different notions of what the data type looks like.
1281 The idea is that after we compile a module which also has an .hs-boot
1282 file, we re-generate the ModDetails for each of the modules that
1283 depends on the .hs-boot file, so that everyone points to the proper
1284 TyCons, Ids etc. defined by the real module, not the boot module.
1285 Fortunately re-generating a ModDetails from a ModIface is easy: the
1286 function TcIface.typecheckIface does exactly that.
1288 Picking the modules to re-typecheck is slightly tricky. Starting from
1289 the module graph consisting of the modules that have already been
1290 compiled, we reverse the edges (so they point from the imported module
1291 to the importing module), and depth-first-search from the .hs-boot
1292 node. This gives us all the modules that depend transitively on the
1293 .hs-boot module, and those are exactly the modules that we need to
1296 Following this fix, GHC can compile itself with --make -O2.
1299 reTypecheckLoop :: HscEnv -> ModSummary -> ModuleGraph -> IO HscEnv
1300 reTypecheckLoop hsc_env ms graph
1301 | not (isBootSummary ms) &&
1302 any (\m -> ms_mod m == this_mod && isBootSummary m) graph
1304 let mss = reachableBackwards (ms_mod_name ms) graph
1305 non_boot = filter (not.isBootSummary) mss
1306 debugTraceMsg (hsc_dflags hsc_env) 2 $
1307 text "Re-typechecking loop: " <> ppr (map ms_mod_name non_boot)
1308 typecheckLoop hsc_env (map ms_mod_name non_boot)
1312 this_mod = ms_mod ms
1314 typecheckLoop :: HscEnv -> [ModuleName] -> IO HscEnv
1315 typecheckLoop hsc_env mods = do
1317 fixIO $ \new_hpt -> do
1318 let new_hsc_env = hsc_env{ hsc_HPT = new_hpt }
1319 mds <- initIfaceCheck new_hsc_env $
1320 mapM (typecheckIface . hm_iface) hmis
1321 let new_hpt = addListToUFM old_hpt
1322 (zip mods [ hmi{ hm_details = details }
1323 | (hmi,details) <- zip hmis mds ])
1325 return hsc_env{ hsc_HPT = new_hpt }
1327 old_hpt = hsc_HPT hsc_env
1328 hmis = map (expectJust "typecheckLoop" . lookupUFM old_hpt) mods
1330 reachableBackwards :: ModuleName -> [ModSummary] -> [ModSummary]
1331 reachableBackwards mod summaries
1332 = [ ms | (ms,_,_) <- map vertex_fn nodes_we_want ]
1334 -- all the nodes reachable by traversing the edges backwards
1335 -- from the root node:
1336 nodes_we_want = reachable (transposeG graph) root
1338 -- the rest just sets up the graph:
1339 (nodes, lookup_key) = moduleGraphNodes False summaries
1340 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1342 | Just key <- lookup_key HsBootFile mod, Just v <- key_fn key = v
1343 | otherwise = panic "reachableBackwards"
1345 -- ---------------------------------------------------------------------------
1346 -- Topological sort of the module graph
1349 :: Bool -- Drop hi-boot nodes? (see below)
1353 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1354 -- The resulting list of strongly-connected-components is in topologically
1355 -- sorted order, starting with the module(s) at the bottom of the
1356 -- dependency graph (ie compile them first) and ending with the ones at
1359 -- Drop hi-boot nodes (first boolean arg)?
1361 -- False: treat the hi-boot summaries as nodes of the graph,
1362 -- so the graph must be acyclic
1364 -- True: eliminate the hi-boot nodes, and instead pretend
1365 -- the a source-import of Foo is an import of Foo
1366 -- The resulting graph has no hi-boot nodes, but can by cyclic
1368 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1369 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1370 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1371 = stronglyConnComp (map vertex_fn (reachable graph root))
1373 -- restrict the graph to just those modules reachable from
1374 -- the specified module. We do this by building a graph with
1375 -- the full set of nodes, and determining the reachable set from
1376 -- the specified node.
1377 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1378 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1380 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1381 | otherwise = throwDyn (ProgramError "module does not exist")
1383 moduleGraphNodes :: Bool -> [ModSummary]
1384 -> ([(ModSummary, Int, [Int])], HscSource -> ModuleName -> Maybe Int)
1385 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1387 -- Drop hs-boot nodes by using HsSrcFile as the key
1388 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1389 | otherwise = HsBootFile
1391 -- We use integers as the keys for the SCC algorithm
1392 nodes :: [(ModSummary, Int, [Int])]
1393 nodes = [(s, expectJust "topSort" $
1394 lookup_key (ms_hsc_src s) (ms_mod_name s),
1395 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1396 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1397 (-- see [boot-edges] below
1398 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1400 else case lookup_key HsBootFile (ms_mod_name s) of
1405 , not (isBootSummary s && drop_hs_boot_nodes) ]
1406 -- Drop the hi-boot ones if told to do so
1408 -- [boot-edges] if this is a .hs and there is an equivalent
1409 -- .hs-boot, add a link from the former to the latter. This
1410 -- has the effect of detecting bogus cases where the .hs-boot
1411 -- depends on the .hs, by introducing a cycle. Additionally,
1412 -- it ensures that we will always process the .hs-boot before
1413 -- the .hs, and so the HomePackageTable will always have the
1414 -- most up to date information.
1416 key_map :: NodeMap Int
1417 key_map = listToFM ([(moduleName (ms_mod s), ms_hsc_src s)
1421 lookup_key :: HscSource -> ModuleName -> Maybe Int
1422 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1424 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1425 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1426 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1427 -- the IsBootInterface parameter True; else False
1430 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1431 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1433 msKey :: ModSummary -> NodeKey
1434 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1436 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1437 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1439 nodeMapElts :: NodeMap a -> [a]
1440 nodeMapElts = eltsFM
1442 -- If there are {-# SOURCE #-} imports between strongly connected
1443 -- components in the topological sort, then those imports can
1444 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1445 -- were necessary, then the edge would be part of a cycle.
1446 warnUnnecessarySourceImports :: DynFlags -> [SCC ModSummary] -> IO ()
1447 warnUnnecessarySourceImports dflags sccs =
1448 printBagOfWarnings dflags (listToBag (concat (map (check.flattenSCC) sccs)))
1450 let mods_in_this_cycle = map ms_mod_name ms in
1451 [ warn i | m <- ms, i <- ms_srcimps m,
1452 unLoc i `notElem` mods_in_this_cycle ]
1454 warn :: Located ModuleName -> WarnMsg
1457 (ptext SLIT("Warning: {-# SOURCE #-} unnecessary in import of ")
1458 <+> quotes (ppr mod))
1460 -----------------------------------------------------------------------------
1461 -- Downsweep (dependency analysis)
1463 -- Chase downwards from the specified root set, returning summaries
1464 -- for all home modules encountered. Only follow source-import
1467 -- We pass in the previous collection of summaries, which is used as a
1468 -- cache to avoid recalculating a module summary if the source is
1471 -- The returned list of [ModSummary] nodes has one node for each home-package
1472 -- module, plus one for any hs-boot files. The imports of these nodes
1473 -- are all there, including the imports of non-home-package modules.
1476 -> [ModSummary] -- Old summaries
1477 -> [ModuleName] -- Ignore dependencies on these; treat
1478 -- them as if they were package modules
1479 -> Bool -- True <=> allow multiple targets to have
1480 -- the same module name; this is
1481 -- very useful for ghc -M
1482 -> IO (Maybe [ModSummary])
1483 -- The elts of [ModSummary] all have distinct
1484 -- (Modules, IsBoot) identifiers, unless the Bool is true
1485 -- in which case there can be repeats
1486 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1487 = -- catch error messages and return them
1488 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1489 rootSummaries <- mapM getRootSummary roots
1490 let root_map = mkRootMap rootSummaries
1491 checkDuplicates root_map
1492 summs <- loop (concatMap msDeps rootSummaries) root_map
1495 roots = hsc_targets hsc_env
1497 old_summary_map :: NodeMap ModSummary
1498 old_summary_map = mkNodeMap old_summaries
1500 getRootSummary :: Target -> IO ModSummary
1501 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1502 = do exists <- doesFileExist file
1504 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1505 else throwDyn $ mkPlainErrMsg noSrcSpan $
1506 text "can't find file:" <+> text file
1507 getRootSummary (Target (TargetModule modl) maybe_buf)
1508 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1509 (L rootLoc modl) maybe_buf excl_mods
1510 case maybe_summary of
1511 Nothing -> packageModErr modl
1514 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1516 -- In a root module, the filename is allowed to diverge from the module
1517 -- name, so we have to check that there aren't multiple root files
1518 -- defining the same module (otherwise the duplicates will be silently
1519 -- ignored, leading to confusing behaviour).
1520 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1521 checkDuplicates root_map
1522 | allow_dup_roots = return ()
1523 | null dup_roots = return ()
1524 | otherwise = multiRootsErr (head dup_roots)
1526 dup_roots :: [[ModSummary]] -- Each at least of length 2
1527 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1529 loop :: [(Located ModuleName,IsBootInterface)]
1530 -- Work list: process these modules
1531 -> NodeMap [ModSummary]
1532 -- Visited set; the range is a list because
1533 -- the roots can have the same module names
1534 -- if allow_dup_roots is True
1536 -- The result includes the worklist, except
1537 -- for those mentioned in the visited set
1538 loop [] done = return (concat (nodeMapElts done))
1539 loop ((wanted_mod, is_boot) : ss) done
1540 | Just summs <- lookupFM done key
1541 = if isSingleton summs then
1544 do { multiRootsErr summs; return [] }
1545 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1546 is_boot wanted_mod Nothing excl_mods
1548 Nothing -> loop ss done
1549 Just s -> loop (msDeps s ++ ss)
1550 (addToFM done key [s]) }
1552 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1554 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1555 mkRootMap summaries = addListToFM_C (++) emptyFM
1556 [ (msKey s, [s]) | s <- summaries ]
1558 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1559 -- (msDeps s) returns the dependencies of the ModSummary s.
1560 -- A wrinkle is that for a {-# SOURCE #-} import we return
1561 -- *both* the hs-boot file
1562 -- *and* the source file
1563 -- as "dependencies". That ensures that the list of all relevant
1564 -- modules always contains B.hs if it contains B.hs-boot.
1565 -- Remember, this pass isn't doing the topological sort. It's
1566 -- just gathering the list of all relevant ModSummaries
1568 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1569 ++ [ (m,False) | m <- ms_imps s ]
1571 -----------------------------------------------------------------------------
1572 -- Summarising modules
1574 -- We have two types of summarisation:
1576 -- * Summarise a file. This is used for the root module(s) passed to
1577 -- cmLoadModules. The file is read, and used to determine the root
1578 -- module name. The module name may differ from the filename.
1580 -- * Summarise a module. We are given a module name, and must provide
1581 -- a summary. The finder is used to locate the file in which the module
1586 -> [ModSummary] -- old summaries
1587 -> FilePath -- source file name
1588 -> Maybe Phase -- start phase
1589 -> Maybe (StringBuffer,ClockTime)
1592 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1593 -- we can use a cached summary if one is available and the
1594 -- source file hasn't changed, But we have to look up the summary
1595 -- by source file, rather than module name as we do in summarise.
1596 | Just old_summary <- findSummaryBySourceFile old_summaries file
1598 let location = ms_location old_summary
1600 -- return the cached summary if the source didn't change
1601 src_timestamp <- case maybe_buf of
1602 Just (_,t) -> return t
1603 Nothing -> getModificationTime file
1604 -- The file exists; we checked in getRootSummary above.
1605 -- If it gets removed subsequently, then this
1606 -- getModificationTime may fail, but that's the right
1609 if ms_hs_date old_summary == src_timestamp
1610 then do -- update the object-file timestamp
1611 obj_timestamp <- getObjTimestamp location False
1612 return old_summary{ ms_obj_date = obj_timestamp }
1620 let dflags = hsc_dflags hsc_env
1622 (dflags', hspp_fn, buf)
1623 <- preprocessFile dflags file mb_phase maybe_buf
1625 (srcimps,the_imps, L _ mod_name) <- getImports dflags' buf hspp_fn file
1627 -- Make a ModLocation for this file
1628 location <- mkHomeModLocation dflags mod_name file
1630 -- Tell the Finder cache where it is, so that subsequent calls
1631 -- to findModule will find it, even if it's not on any search path
1632 mod <- addHomeModuleToFinder hsc_env mod_name location
1634 src_timestamp <- case maybe_buf of
1635 Just (_,t) -> return t
1636 Nothing -> getModificationTime file
1637 -- getMofificationTime may fail
1639 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1641 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1642 ms_location = location,
1643 ms_hspp_file = hspp_fn,
1644 ms_hspp_opts = dflags',
1645 ms_hspp_buf = Just buf,
1646 ms_srcimps = srcimps, ms_imps = the_imps,
1647 ms_hs_date = src_timestamp,
1648 ms_obj_date = obj_timestamp })
1650 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1651 findSummaryBySourceFile summaries file
1652 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1653 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
1657 -- Summarise a module, and pick up source and timestamp.
1660 -> NodeMap ModSummary -- Map of old summaries
1661 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1662 -> Located ModuleName -- Imported module to be summarised
1663 -> Maybe (StringBuffer, ClockTime)
1664 -> [ModuleName] -- Modules to exclude
1665 -> IO (Maybe ModSummary) -- Its new summary
1667 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1668 | wanted_mod `elem` excl_mods
1671 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1672 = do -- Find its new timestamp; all the
1673 -- ModSummaries in the old map have valid ml_hs_files
1674 let location = ms_location old_summary
1675 src_fn = expectJust "summariseModule" (ml_hs_file location)
1677 -- check the modification time on the source file, and
1678 -- return the cached summary if it hasn't changed. If the
1679 -- file has disappeared, we need to call the Finder again.
1681 Just (_,t) -> check_timestamp old_summary location src_fn t
1683 m <- System.IO.Error.try (getModificationTime src_fn)
1685 Right t -> check_timestamp old_summary location src_fn t
1686 Left e | isDoesNotExistError e -> find_it
1687 | otherwise -> ioError e
1689 | otherwise = find_it
1691 dflags = hsc_dflags hsc_env
1693 hsc_src = if is_boot then HsBootFile else HsSrcFile
1695 check_timestamp old_summary location src_fn src_timestamp
1696 | ms_hs_date old_summary == src_timestamp = do
1697 -- update the object-file timestamp
1698 obj_timestamp <- getObjTimestamp location is_boot
1699 return (Just old_summary{ ms_obj_date = obj_timestamp })
1701 -- source changed: re-summarise.
1702 new_summary location (ms_mod old_summary) src_fn src_timestamp
1705 -- Don't use the Finder's cache this time. If the module was
1706 -- previously a package module, it may have now appeared on the
1707 -- search path, so we want to consider it to be a home module. If
1708 -- the module was previously a home module, it may have moved.
1709 uncacheModule hsc_env wanted_mod
1710 found <- findImportedModule hsc_env wanted_mod Nothing
1713 | isJust (ml_hs_file location) ->
1715 just_found location mod
1717 -- Drop external-pkg
1718 ASSERT(modulePackageId mod /= thisPackage dflags)
1722 err -> noModError dflags loc wanted_mod err
1725 just_found location mod = do
1726 -- Adjust location to point to the hs-boot source file,
1727 -- hi file, object file, when is_boot says so
1728 let location' | is_boot = addBootSuffixLocn location
1729 | otherwise = location
1730 src_fn = expectJust "summarise2" (ml_hs_file location')
1732 -- Check that it exists
1733 -- It might have been deleted since the Finder last found it
1734 maybe_t <- modificationTimeIfExists src_fn
1736 Nothing -> noHsFileErr loc src_fn
1737 Just t -> new_summary location' mod src_fn t
1740 new_summary location mod src_fn src_timestamp
1742 -- Preprocess the source file and get its imports
1743 -- The dflags' contains the OPTIONS pragmas
1744 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1745 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn src_fn
1747 when (mod_name /= wanted_mod) $
1748 throwDyn $ mkPlainErrMsg mod_loc $
1749 text "file name does not match module name"
1750 <+> quotes (ppr mod_name)
1752 -- Find the object timestamp, and return the summary
1753 obj_timestamp <- getObjTimestamp location is_boot
1755 return (Just ( ModSummary { ms_mod = mod,
1756 ms_hsc_src = hsc_src,
1757 ms_location = location,
1758 ms_hspp_file = hspp_fn,
1759 ms_hspp_opts = dflags',
1760 ms_hspp_buf = Just buf,
1761 ms_srcimps = srcimps,
1763 ms_hs_date = src_timestamp,
1764 ms_obj_date = obj_timestamp }))
1767 getObjTimestamp :: ModLocation -> Bool -> IO (Maybe ClockTime)
1768 getObjTimestamp location is_boot
1769 = if is_boot then return Nothing
1770 else modificationTimeIfExists (ml_obj_file location)
1773 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1774 -> IO (DynFlags, FilePath, StringBuffer)
1775 preprocessFile dflags src_fn mb_phase Nothing
1777 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1778 buf <- hGetStringBuffer hspp_fn
1779 return (dflags', hspp_fn, buf)
1781 preprocessFile dflags src_fn mb_phase (Just (buf, _time))
1783 -- case we bypass the preprocessing stage?
1785 local_opts = getOptions buf src_fn
1787 (dflags', _errs) <- parseDynamicFlags dflags (map unLoc local_opts)
1788 -- XXX: shouldn't we be reporting the errors?
1792 | Just (Unlit _) <- mb_phase = True
1793 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1794 -- note: local_opts is only required if there's no Unlit phase
1795 | dopt Opt_Cpp dflags' = True
1796 | dopt Opt_Pp dflags' = True
1799 when needs_preprocessing $
1800 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1802 return (dflags', src_fn, buf)
1805 -----------------------------------------------------------------------------
1807 -----------------------------------------------------------------------------
1809 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
1810 -- ToDo: we don't have a proper line number for this error
1811 noModError dflags loc wanted_mod err
1812 = throwDyn $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
1814 noHsFileErr :: SrcSpan -> String -> a
1815 noHsFileErr loc path
1816 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1818 packageModErr :: ModuleName -> a
1820 = throwDyn $ mkPlainErrMsg noSrcSpan $
1821 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1823 multiRootsErr :: [ModSummary] -> IO ()
1824 multiRootsErr [] = panic "multiRootsErr"
1825 multiRootsErr summs@(summ1:_)
1826 = throwDyn $ mkPlainErrMsg noSrcSpan $
1827 text "module" <+> quotes (ppr mod) <+>
1828 text "is defined in multiple files:" <+>
1829 sep (map text files)
1832 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1834 cyclicModuleErr :: [ModSummary] -> SDoc
1836 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1837 2 (vcat (map show_one ms))
1839 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1840 nest 2 $ ptext SLIT("imports:") <+>
1841 (pp_imps HsBootFile (ms_srcimps ms)
1842 $$ pp_imps HsSrcFile (ms_imps ms))]
1843 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1844 pp_imps src mods = fsep (map (show_mod src) mods)
1847 -- | Inform GHC that the working directory has changed. GHC will flush
1848 -- its cache of module locations, since it may no longer be valid.
1849 -- Note: if you change the working directory, you should also unload
1850 -- the current program (set targets to empty, followed by load).
1851 workingDirectoryChanged :: Session -> IO ()
1852 workingDirectoryChanged s = withSession s $ flushFinderCaches
1854 -- -----------------------------------------------------------------------------
1855 -- inspecting the session
1857 -- | Get the module dependency graph.
1858 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1859 getModuleGraph s = withSession s (return . hsc_mod_graph)
1861 isLoaded :: Session -> ModuleName -> IO Bool
1862 isLoaded s m = withSession s $ \hsc_env ->
1863 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
1865 getBindings :: Session -> IO [TyThing]
1866 getBindings s = withSession s $ \hsc_env ->
1867 -- we have to implement the shadowing behaviour of ic_tmp_ids here
1868 -- (see InteractiveContext) and the quickest way is to use an OccEnv.
1870 tmp_ids = ic_tmp_ids (hsc_IC hsc_env)
1871 filtered = foldr f (const []) tmp_ids emptyUniqSet
1873 | uniq `elementOfUniqSet` set = rest set
1874 | otherwise = AnId id : rest (addOneToUniqSet set uniq)
1875 where uniq = getUnique (nameOccName (idName id))
1879 getPrintUnqual :: Session -> IO PrintUnqualified
1880 getPrintUnqual s = withSession s $ \hsc_env ->
1881 return (icPrintUnqual (hsc_dflags hsc_env) (hsc_IC hsc_env))
1883 -- | Container for information about a 'Module'.
1884 data ModuleInfo = ModuleInfo {
1885 minf_type_env :: TypeEnv,
1886 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
1887 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1888 minf_instances :: [Instance]
1890 ,minf_modBreaks :: ModBreaks
1892 -- ToDo: this should really contain the ModIface too
1894 -- We don't want HomeModInfo here, because a ModuleInfo applies
1895 -- to package modules too.
1897 -- | Request information about a loaded 'Module'
1898 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1899 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1900 let mg = hsc_mod_graph hsc_env
1901 if mdl `elem` map ms_mod mg
1902 then getHomeModuleInfo hsc_env (moduleName mdl)
1904 {- if isHomeModule (hsc_dflags hsc_env) mdl
1906 else -} getPackageModuleInfo hsc_env mdl
1907 -- getPackageModuleInfo will attempt to find the interface, so
1908 -- we don't want to call it for a home module, just in case there
1909 -- was a problem loading the module and the interface doesn't
1910 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1912 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1914 getPackageModuleInfo hsc_env mdl = do
1915 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
1917 Nothing -> return Nothing
1919 eps <- readIORef (hsc_EPS hsc_env)
1921 names = availsToNameSet avails
1923 tys = [ ty | name <- concatMap availNames avails,
1924 Just ty <- [lookupTypeEnv pte name] ]
1926 return (Just (ModuleInfo {
1927 minf_type_env = mkTypeEnv tys,
1928 minf_exports = names,
1929 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
1930 minf_instances = error "getModuleInfo: instances for package module unimplemented",
1931 minf_modBreaks = emptyModBreaks
1934 getPackageModuleInfo _hsc_env _mdl = do
1935 -- bogusly different for non-GHCI (ToDo)
1939 getHomeModuleInfo :: HscEnv -> ModuleName -> IO (Maybe ModuleInfo)
1940 getHomeModuleInfo hsc_env mdl =
1941 case lookupUFM (hsc_HPT hsc_env) mdl of
1942 Nothing -> return Nothing
1944 let details = hm_details hmi
1945 return (Just (ModuleInfo {
1946 minf_type_env = md_types details,
1947 minf_exports = availsToNameSet (md_exports details),
1948 minf_rdr_env = mi_globals $! hm_iface hmi,
1949 minf_instances = md_insts details
1951 ,minf_modBreaks = getModBreaks hmi
1955 -- | The list of top-level entities defined in a module
1956 modInfoTyThings :: ModuleInfo -> [TyThing]
1957 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1959 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1960 modInfoTopLevelScope minf
1961 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1963 modInfoExports :: ModuleInfo -> [Name]
1964 modInfoExports minf = nameSetToList $! minf_exports minf
1966 -- | Returns the instances defined by the specified module.
1967 -- Warning: currently unimplemented for package modules.
1968 modInfoInstances :: ModuleInfo -> [Instance]
1969 modInfoInstances = minf_instances
1971 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1972 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1974 mkPrintUnqualifiedForModule :: Session -> ModuleInfo -> IO (Maybe PrintUnqualified)
1975 mkPrintUnqualifiedForModule s minf = withSession s $ \hsc_env -> do
1976 return (fmap (mkPrintUnqualified (hsc_dflags hsc_env)) (minf_rdr_env minf))
1978 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1979 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1980 case lookupTypeEnv (minf_type_env minf) name of
1981 Just tyThing -> return (Just tyThing)
1983 eps <- readIORef (hsc_EPS hsc_env)
1984 return $! lookupType (hsc_dflags hsc_env)
1985 (hsc_HPT hsc_env) (eps_PTE eps) name
1988 modInfoModBreaks :: ModuleInfo -> ModBreaks
1989 modInfoModBreaks = minf_modBreaks
1992 isDictonaryId :: Id -> Bool
1994 = case tcSplitSigmaTy (idType id) of { (_tvs, _theta, tau) -> isDictTy tau }
1996 -- | Looks up a global name: that is, any top-level name in any
1997 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1998 -- the interactive context, and therefore does not require a preceding
2000 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
2001 lookupGlobalName s name = withSession s $ \hsc_env -> do
2002 eps <- readIORef (hsc_EPS hsc_env)
2003 return $! lookupType (hsc_dflags hsc_env)
2004 (hsc_HPT hsc_env) (eps_PTE eps) name
2006 -- -----------------------------------------------------------------------------
2007 -- Misc exported utils
2009 dataConType :: DataCon -> Type
2010 dataConType dc = idType (dataConWrapId dc)
2012 -- | print a 'NamedThing', adding parentheses if the name is an operator.
2013 pprParenSymName :: NamedThing a => a -> SDoc
2014 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
2016 -- ----------------------------------------------------------------------------
2021 -- - Data and Typeable instances for HsSyn.
2023 -- ToDo: check for small transformations that happen to the syntax in
2024 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
2026 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
2027 -- to get from TyCons, Ids etc. to TH syntax (reify).
2029 -- :browse will use either lm_toplev or inspect lm_interface, depending
2030 -- on whether the module is interpreted or not.
2032 -- This is for reconstructing refactored source code
2033 -- Calls the lexer repeatedly.
2034 -- ToDo: add comment tokens to token stream
2035 getTokenStream :: Session -> Module -> IO [Located Token]
2038 -- -----------------------------------------------------------------------------
2039 -- Interactive evaluation
2041 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
2042 -- filesystem and package database to find the corresponding 'Module',
2043 -- using the algorithm that is used for an @import@ declaration.
2044 findModule :: Session -> ModuleName -> Maybe PackageId -> IO Module
2045 findModule s mod_name maybe_pkg = withSession s $ \hsc_env ->
2047 dflags = hsc_dflags hsc_env
2048 hpt = hsc_HPT hsc_env
2049 this_pkg = thisPackage dflags
2051 case lookupUFM hpt mod_name of
2052 Just mod_info -> return (mi_module (hm_iface mod_info))
2053 _not_a_home_module -> do
2054 res <- findImportedModule hsc_env mod_name maybe_pkg
2056 Found _ m | modulePackageId m /= this_pkg -> return m
2057 | otherwise -> throwDyn (CmdLineError (showSDoc $
2058 text "module" <+> pprModule m <+>
2059 text "is not loaded"))
2060 err -> let msg = cannotFindModule dflags mod_name err in
2061 throwDyn (CmdLineError (showSDoc msg))
2064 getHistorySpan :: Session -> History -> IO SrcSpan
2065 getHistorySpan sess h = withSession sess $ \hsc_env ->
2066 return$ InteractiveEval.getHistorySpan hsc_env h
2068 obtainTerm :: Session -> Bool -> Id -> IO Term
2069 obtainTerm sess force id = withSession sess $ \hsc_env ->
2070 InteractiveEval.obtainTerm hsc_env force id
2072 obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term
2073 obtainTerm1 sess force mb_ty a = withSession sess $ \hsc_env ->
2074 InteractiveEval.obtainTerm1 hsc_env force mb_ty a
2076 obtainTermB :: Session -> Int -> Bool -> Id -> IO Term
2077 obtainTermB sess bound force id = withSession sess $ \hsc_env ->
2078 InteractiveEval.obtainTermB hsc_env bound force id