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 -- ToDo: explain argument [[mb_top_dir]]
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 coreModule :: Maybe CoreModule
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 coreModule = 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 coreModule = 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 Core module (consisting of
849 -- the module name, type declarations, and function declarations) if
851 compileToCoreModule :: Session -> FilePath -> IO (Maybe CoreModule)
852 compileToCoreModule session fn = do
853 -- First, set the target to the desired filename
854 target <- guessTarget fn Nothing
855 addTarget session target
856 load session LoadAllTargets
857 -- Then find dependencies
858 maybeModGraph <- depanal session [] True
859 case maybeModGraph of
860 Nothing -> return Nothing
862 case find ((== fn) . msHsFilePath) modGraph of
863 Just modSummary -> do
864 -- Now we have the module name;
865 -- parse, typecheck and desugar the module
866 let mod = ms_mod_name modSummary
867 maybeCheckedModule <- checkModule session mod True
868 case maybeCheckedModule of
869 Nothing -> return Nothing
870 Just checkedMod -> return $ coreModule checkedMod
871 Nothing -> panic "compileToCoreModule: target FilePath not found in\
872 module dependency graph"
874 -- | Provided for backwards-compatibility: compileToCore returns just the Core
875 -- bindings, but for most purposes, you probably want to call
876 -- compileToCoreModule.
877 compileToCore :: Session -> FilePath -> IO (Maybe [CoreBind])
878 compileToCore session fn = do
879 maybeCoreModule <- compileToCoreModule session fn
880 return $ fmap cm_binds maybeCoreModule
881 -- ---------------------------------------------------------------------------
884 unload :: HscEnv -> [Linkable] -> IO ()
885 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
886 = case ghcLink (hsc_dflags hsc_env) of
888 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
890 LinkInMemory -> panic "unload: no interpreter"
891 -- urgh. avoid warnings:
892 hsc_env stable_linkables
896 -- -----------------------------------------------------------------------------
900 Stability tells us which modules definitely do not need to be recompiled.
901 There are two main reasons for having stability:
903 - avoid doing a complete upsweep of the module graph in GHCi when
904 modules near the bottom of the tree have not changed.
906 - to tell GHCi when it can load object code: we can only load object code
907 for a module when we also load object code fo all of the imports of the
908 module. So we need to know that we will definitely not be recompiling
909 any of these modules, and we can use the object code.
911 The stability check is as follows. Both stableObject and
912 stableBCO are used during the upsweep phase later.
915 stable m = stableObject m || stableBCO m
918 all stableObject (imports m)
919 && old linkable does not exist, or is == on-disk .o
920 && date(on-disk .o) > date(.hs)
923 all stable (imports m)
924 && date(BCO) > date(.hs)
927 These properties embody the following ideas:
929 - if a module is stable, then:
930 - if it has been compiled in a previous pass (present in HPT)
931 then it does not need to be compiled or re-linked.
932 - if it has not been compiled in a previous pass,
933 then we only need to read its .hi file from disk and
934 link it to produce a ModDetails.
936 - if a modules is not stable, we will definitely be at least
937 re-linking, and possibly re-compiling it during the upsweep.
938 All non-stable modules can (and should) therefore be unlinked
941 - Note that objects are only considered stable if they only depend
942 on other objects. We can't link object code against byte code.
946 :: HomePackageTable -- HPT from last compilation
947 -> [SCC ModSummary] -- current module graph (cyclic)
948 -> [ModuleName] -- all home modules
949 -> ([ModuleName], -- stableObject
950 [ModuleName]) -- stableBCO
952 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
954 checkSCC (stable_obj, stable_bco) scc0
955 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
956 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
957 | otherwise = (stable_obj, stable_bco)
959 scc = flattenSCC scc0
960 scc_mods = map ms_mod_name scc
961 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
963 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
964 -- all imports outside the current SCC, but in the home pkg
966 stable_obj_imps = map (`elem` stable_obj) scc_allimps
967 stable_bco_imps = map (`elem` stable_bco) scc_allimps
974 and (zipWith (||) stable_obj_imps stable_bco_imps)
978 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
982 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
983 Just hmi | Just l <- hm_linkable hmi
984 -> isObjectLinkable l && t == linkableTime l
986 -- why '>=' rather than '>' above? If the filesystem stores
987 -- times to the nearset second, we may occasionally find that
988 -- the object & source have the same modification time,
989 -- especially if the source was automatically generated
990 -- and compiled. Using >= is slightly unsafe, but it matches
994 = case lookupUFM hpt (ms_mod_name ms) of
995 Just hmi | Just l <- hm_linkable hmi ->
996 not (isObjectLinkable l) &&
997 linkableTime l >= ms_hs_date ms
1000 ms_allimps :: ModSummary -> [ModuleName]
1001 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
1003 -- -----------------------------------------------------------------------------
1004 -- Prune the HomePackageTable
1006 -- Before doing an upsweep, we can throw away:
1008 -- - For non-stable modules:
1009 -- - all ModDetails, all linked code
1010 -- - all unlinked code that is out of date with respect to
1013 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
1014 -- space at the end of the upsweep, because the topmost ModDetails of the
1015 -- old HPT holds on to the entire type environment from the previous
1018 pruneHomePackageTable
1021 -> ([ModuleName],[ModuleName])
1024 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
1027 | is_stable modl = hmi'
1028 | otherwise = hmi'{ hm_details = emptyModDetails }
1030 modl = moduleName (mi_module (hm_iface hmi))
1031 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
1032 = hmi{ hm_linkable = Nothing }
1035 where ms = expectJust "prune" (lookupUFM ms_map modl)
1037 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
1039 is_stable m = m `elem` stable_obj || m `elem` stable_bco
1041 -- -----------------------------------------------------------------------------
1043 -- Return (names of) all those in modsDone who are part of a cycle
1044 -- as defined by theGraph.
1045 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1046 findPartiallyCompletedCycles modsDone theGraph
1050 chew ((AcyclicSCC _):rest) = chew rest -- acyclic? not interesting.
1051 chew ((CyclicSCC vs):rest)
1052 = let names_in_this_cycle = nub (map ms_mod vs)
1054 = nub ([done | done <- modsDone,
1055 done `elem` names_in_this_cycle])
1056 chewed_rest = chew rest
1058 if notNull mods_in_this_cycle
1059 && length mods_in_this_cycle < length names_in_this_cycle
1060 then mods_in_this_cycle ++ chewed_rest
1063 -- -----------------------------------------------------------------------------
1066 -- This is where we compile each module in the module graph, in a pass
1067 -- from the bottom to the top of the graph.
1069 -- There better had not be any cyclic groups here -- we check for them.
1072 :: HscEnv -- Includes initially-empty HPT
1073 -> HomePackageTable -- HPT from last time round (pruned)
1074 -> ([ModuleName],[ModuleName]) -- stable modules (see checkStability)
1075 -> IO () -- How to clean up unwanted tmp files
1076 -> [SCC ModSummary] -- Mods to do (the worklist)
1078 HscEnv, -- With an updated HPT
1079 [ModSummary]) -- Mods which succeeded
1081 upsweep hsc_env old_hpt stable_mods cleanup sccs = do
1082 (res, hsc_env, done) <- upsweep' hsc_env old_hpt [] sccs 1 (length sccs)
1083 return (res, hsc_env, reverse done)
1086 upsweep' hsc_env _old_hpt done
1088 = return (Succeeded, hsc_env, done)
1090 upsweep' hsc_env _old_hpt done
1091 (CyclicSCC ms:_) _ _
1092 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1093 return (Failed, hsc_env, done)
1095 upsweep' hsc_env old_hpt done
1096 (AcyclicSCC mod:mods) mod_index nmods
1097 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1098 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1099 -- (moduleEnvElts (hsc_HPT hsc_env)))
1101 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1104 cleanup -- Remove unwanted tmp files between compilations
1107 Nothing -> return (Failed, hsc_env, [])
1109 let this_mod = ms_mod_name mod
1111 -- Add new info to hsc_env
1112 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1113 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1115 -- Space-saving: delete the old HPT entry
1116 -- for mod BUT if mod is a hs-boot
1117 -- node, don't delete it. For the
1118 -- interface, the HPT entry is probaby for the
1119 -- main Haskell source file. Deleting it
1120 -- would force the real module to be recompiled
1122 old_hpt1 | isBootSummary mod = old_hpt
1123 | otherwise = delFromUFM old_hpt this_mod
1127 -- fixup our HomePackageTable after we've finished compiling
1128 -- a mutually-recursive loop. See reTypecheckLoop, below.
1129 hsc_env2 <- reTypecheckLoop hsc_env1 mod done'
1131 upsweep' hsc_env2 old_hpt1 done' mods (mod_index+1) nmods
1134 -- Compile a single module. Always produce a Linkable for it if
1135 -- successful. If no compilation happened, return the old Linkable.
1136 upsweep_mod :: HscEnv
1138 -> ([ModuleName],[ModuleName])
1140 -> Int -- index of module
1141 -> Int -- total number of modules
1142 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1144 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1146 this_mod_name = ms_mod_name summary
1147 this_mod = ms_mod summary
1148 mb_obj_date = ms_obj_date summary
1149 obj_fn = ml_obj_file (ms_location summary)
1150 hs_date = ms_hs_date summary
1152 is_stable_obj = this_mod_name `elem` stable_obj
1153 is_stable_bco = this_mod_name `elem` stable_bco
1155 old_hmi = lookupUFM old_hpt this_mod_name
1157 -- We're using the dflags for this module now, obtained by
1158 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1159 dflags = ms_hspp_opts summary
1160 prevailing_target = hscTarget (hsc_dflags hsc_env)
1161 local_target = hscTarget dflags
1163 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1164 -- we don't do anything dodgy: these should only work to change
1165 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1166 -- end up trying to link object code to byte code.
1167 target = if prevailing_target /= local_target
1168 && (not (isObjectTarget prevailing_target)
1169 || not (isObjectTarget local_target))
1170 then prevailing_target
1173 -- store the corrected hscTarget into the summary
1174 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1176 -- The old interface is ok if
1177 -- a) we're compiling a source file, and the old HPT
1178 -- entry is for a source file
1179 -- b) we're compiling a hs-boot file
1180 -- Case (b) allows an hs-boot file to get the interface of its
1181 -- real source file on the second iteration of the compilation
1182 -- manager, but that does no harm. Otherwise the hs-boot file
1183 -- will always be recompiled
1188 Just hm_info | isBootSummary summary -> Just iface
1189 | not (mi_boot iface) -> Just iface
1190 | otherwise -> Nothing
1192 iface = hm_iface hm_info
1194 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1195 compile_it = compile hsc_env summary' mod_index nmods mb_old_iface
1197 compile_it_discard_iface
1198 = compile hsc_env summary' mod_index nmods Nothing
1204 -- Regardless of whether we're generating object code or
1205 -- byte code, we can always use an existing object file
1206 -- if it is *stable* (see checkStability).
1207 | is_stable_obj, isJust old_hmi ->
1209 -- object is stable, and we have an entry in the
1210 -- old HPT: nothing to do
1212 | is_stable_obj, isNothing old_hmi -> do
1213 linkable <- findObjectLinkable this_mod obj_fn
1214 (expectJust "upseep1" mb_obj_date)
1215 compile_it (Just linkable)
1216 -- object is stable, but we need to load the interface
1217 -- off disk to make a HMI.
1221 ASSERT(isJust old_hmi) -- must be in the old_hpt
1223 -- BCO is stable: nothing to do
1225 | Just hmi <- old_hmi,
1226 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1227 linkableTime l >= ms_hs_date summary ->
1229 -- we have an old BCO that is up to date with respect
1230 -- to the source: do a recompilation check as normal.
1234 -- no existing code at all: we must recompile.
1236 -- When generating object code, if there's an up-to-date
1237 -- object file on the disk, then we can use it.
1238 -- However, if the object file is new (compared to any
1239 -- linkable we had from a previous compilation), then we
1240 -- must discard any in-memory interface, because this
1241 -- means the user has compiled the source file
1242 -- separately and generated a new interface, that we must
1243 -- read from the disk.
1245 obj | isObjectTarget obj,
1246 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1249 | Just l <- hm_linkable hmi,
1250 isObjectLinkable l && linkableTime l == obj_date
1251 -> compile_it (Just l)
1253 linkable <- findObjectLinkable this_mod obj_fn obj_date
1254 compile_it_discard_iface (Just linkable)
1261 -- Filter modules in the HPT
1262 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1263 retainInTopLevelEnvs keep_these hpt
1264 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1266 , let mb_mod_info = lookupUFM hpt mod
1267 , isJust mb_mod_info ]
1269 -- ---------------------------------------------------------------------------
1270 -- Typecheck module loops
1273 See bug #930. This code fixes a long-standing bug in --make. The
1274 problem is that when compiling the modules *inside* a loop, a data
1275 type that is only defined at the top of the loop looks opaque; but
1276 after the loop is done, the structure of the data type becomes
1279 The difficulty is then that two different bits of code have
1280 different notions of what the data type looks like.
1282 The idea is that after we compile a module which also has an .hs-boot
1283 file, we re-generate the ModDetails for each of the modules that
1284 depends on the .hs-boot file, so that everyone points to the proper
1285 TyCons, Ids etc. defined by the real module, not the boot module.
1286 Fortunately re-generating a ModDetails from a ModIface is easy: the
1287 function TcIface.typecheckIface does exactly that.
1289 Picking the modules to re-typecheck is slightly tricky. Starting from
1290 the module graph consisting of the modules that have already been
1291 compiled, we reverse the edges (so they point from the imported module
1292 to the importing module), and depth-first-search from the .hs-boot
1293 node. This gives us all the modules that depend transitively on the
1294 .hs-boot module, and those are exactly the modules that we need to
1297 Following this fix, GHC can compile itself with --make -O2.
1300 reTypecheckLoop :: HscEnv -> ModSummary -> ModuleGraph -> IO HscEnv
1301 reTypecheckLoop hsc_env ms graph
1302 | not (isBootSummary ms) &&
1303 any (\m -> ms_mod m == this_mod && isBootSummary m) graph
1305 let mss = reachableBackwards (ms_mod_name ms) graph
1306 non_boot = filter (not.isBootSummary) mss
1307 debugTraceMsg (hsc_dflags hsc_env) 2 $
1308 text "Re-typechecking loop: " <> ppr (map ms_mod_name non_boot)
1309 typecheckLoop hsc_env (map ms_mod_name non_boot)
1313 this_mod = ms_mod ms
1315 typecheckLoop :: HscEnv -> [ModuleName] -> IO HscEnv
1316 typecheckLoop hsc_env mods = do
1318 fixIO $ \new_hpt -> do
1319 let new_hsc_env = hsc_env{ hsc_HPT = new_hpt }
1320 mds <- initIfaceCheck new_hsc_env $
1321 mapM (typecheckIface . hm_iface) hmis
1322 let new_hpt = addListToUFM old_hpt
1323 (zip mods [ hmi{ hm_details = details }
1324 | (hmi,details) <- zip hmis mds ])
1326 return hsc_env{ hsc_HPT = new_hpt }
1328 old_hpt = hsc_HPT hsc_env
1329 hmis = map (expectJust "typecheckLoop" . lookupUFM old_hpt) mods
1331 reachableBackwards :: ModuleName -> [ModSummary] -> [ModSummary]
1332 reachableBackwards mod summaries
1333 = [ ms | (ms,_,_) <- map vertex_fn nodes_we_want ]
1335 -- all the nodes reachable by traversing the edges backwards
1336 -- from the root node:
1337 nodes_we_want = reachable (transposeG graph) root
1339 -- the rest just sets up the graph:
1340 (nodes, lookup_key) = moduleGraphNodes False summaries
1341 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1343 | Just key <- lookup_key HsBootFile mod, Just v <- key_fn key = v
1344 | otherwise = panic "reachableBackwards"
1346 -- ---------------------------------------------------------------------------
1347 -- Topological sort of the module graph
1350 :: Bool -- Drop hi-boot nodes? (see below)
1354 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1355 -- The resulting list of strongly-connected-components is in topologically
1356 -- sorted order, starting with the module(s) at the bottom of the
1357 -- dependency graph (ie compile them first) and ending with the ones at
1360 -- Drop hi-boot nodes (first boolean arg)?
1362 -- False: treat the hi-boot summaries as nodes of the graph,
1363 -- so the graph must be acyclic
1365 -- True: eliminate the hi-boot nodes, and instead pretend
1366 -- the a source-import of Foo is an import of Foo
1367 -- The resulting graph has no hi-boot nodes, but can by cyclic
1369 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1370 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1371 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1372 = stronglyConnComp (map vertex_fn (reachable graph root))
1374 -- restrict the graph to just those modules reachable from
1375 -- the specified module. We do this by building a graph with
1376 -- the full set of nodes, and determining the reachable set from
1377 -- the specified node.
1378 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1379 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1381 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1382 | otherwise = throwDyn (ProgramError "module does not exist")
1384 moduleGraphNodes :: Bool -> [ModSummary]
1385 -> ([(ModSummary, Int, [Int])], HscSource -> ModuleName -> Maybe Int)
1386 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1388 -- Drop hs-boot nodes by using HsSrcFile as the key
1389 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1390 | otherwise = HsBootFile
1392 -- We use integers as the keys for the SCC algorithm
1393 nodes :: [(ModSummary, Int, [Int])]
1394 nodes = [(s, expectJust "topSort" $
1395 lookup_key (ms_hsc_src s) (ms_mod_name s),
1396 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1397 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1398 (-- see [boot-edges] below
1399 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1401 else case lookup_key HsBootFile (ms_mod_name s) of
1406 , not (isBootSummary s && drop_hs_boot_nodes) ]
1407 -- Drop the hi-boot ones if told to do so
1409 -- [boot-edges] if this is a .hs and there is an equivalent
1410 -- .hs-boot, add a link from the former to the latter. This
1411 -- has the effect of detecting bogus cases where the .hs-boot
1412 -- depends on the .hs, by introducing a cycle. Additionally,
1413 -- it ensures that we will always process the .hs-boot before
1414 -- the .hs, and so the HomePackageTable will always have the
1415 -- most up to date information.
1417 key_map :: NodeMap Int
1418 key_map = listToFM ([(moduleName (ms_mod s), ms_hsc_src s)
1422 lookup_key :: HscSource -> ModuleName -> Maybe Int
1423 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1425 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1426 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1427 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1428 -- the IsBootInterface parameter True; else False
1431 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1432 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1434 msKey :: ModSummary -> NodeKey
1435 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1437 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1438 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1440 nodeMapElts :: NodeMap a -> [a]
1441 nodeMapElts = eltsFM
1443 -- If there are {-# SOURCE #-} imports between strongly connected
1444 -- components in the topological sort, then those imports can
1445 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1446 -- were necessary, then the edge would be part of a cycle.
1447 warnUnnecessarySourceImports :: DynFlags -> [SCC ModSummary] -> IO ()
1448 warnUnnecessarySourceImports dflags sccs =
1449 printBagOfWarnings dflags (listToBag (concat (map (check.flattenSCC) sccs)))
1451 let mods_in_this_cycle = map ms_mod_name ms in
1452 [ warn i | m <- ms, i <- ms_srcimps m,
1453 unLoc i `notElem` mods_in_this_cycle ]
1455 warn :: Located ModuleName -> WarnMsg
1458 (ptext SLIT("Warning: {-# SOURCE #-} unnecessary in import of ")
1459 <+> quotes (ppr mod))
1461 -----------------------------------------------------------------------------
1462 -- Downsweep (dependency analysis)
1464 -- Chase downwards from the specified root set, returning summaries
1465 -- for all home modules encountered. Only follow source-import
1468 -- We pass in the previous collection of summaries, which is used as a
1469 -- cache to avoid recalculating a module summary if the source is
1472 -- The returned list of [ModSummary] nodes has one node for each home-package
1473 -- module, plus one for any hs-boot files. The imports of these nodes
1474 -- are all there, including the imports of non-home-package modules.
1477 -> [ModSummary] -- Old summaries
1478 -> [ModuleName] -- Ignore dependencies on these; treat
1479 -- them as if they were package modules
1480 -> Bool -- True <=> allow multiple targets to have
1481 -- the same module name; this is
1482 -- very useful for ghc -M
1483 -> IO (Maybe [ModSummary])
1484 -- The elts of [ModSummary] all have distinct
1485 -- (Modules, IsBoot) identifiers, unless the Bool is true
1486 -- in which case there can be repeats
1487 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1488 = -- catch error messages and return them
1489 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1490 rootSummaries <- mapM getRootSummary roots
1491 let root_map = mkRootMap rootSummaries
1492 checkDuplicates root_map
1493 summs <- loop (concatMap msDeps rootSummaries) root_map
1496 roots = hsc_targets hsc_env
1498 old_summary_map :: NodeMap ModSummary
1499 old_summary_map = mkNodeMap old_summaries
1501 getRootSummary :: Target -> IO ModSummary
1502 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1503 = do exists <- doesFileExist file
1505 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1506 else throwDyn $ mkPlainErrMsg noSrcSpan $
1507 text "can't find file:" <+> text file
1508 getRootSummary (Target (TargetModule modl) maybe_buf)
1509 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1510 (L rootLoc modl) maybe_buf excl_mods
1511 case maybe_summary of
1512 Nothing -> packageModErr modl
1515 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1517 -- In a root module, the filename is allowed to diverge from the module
1518 -- name, so we have to check that there aren't multiple root files
1519 -- defining the same module (otherwise the duplicates will be silently
1520 -- ignored, leading to confusing behaviour).
1521 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1522 checkDuplicates root_map
1523 | allow_dup_roots = return ()
1524 | null dup_roots = return ()
1525 | otherwise = multiRootsErr (head dup_roots)
1527 dup_roots :: [[ModSummary]] -- Each at least of length 2
1528 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1530 loop :: [(Located ModuleName,IsBootInterface)]
1531 -- Work list: process these modules
1532 -> NodeMap [ModSummary]
1533 -- Visited set; the range is a list because
1534 -- the roots can have the same module names
1535 -- if allow_dup_roots is True
1537 -- The result includes the worklist, except
1538 -- for those mentioned in the visited set
1539 loop [] done = return (concat (nodeMapElts done))
1540 loop ((wanted_mod, is_boot) : ss) done
1541 | Just summs <- lookupFM done key
1542 = if isSingleton summs then
1545 do { multiRootsErr summs; return [] }
1546 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1547 is_boot wanted_mod Nothing excl_mods
1549 Nothing -> loop ss done
1550 Just s -> loop (msDeps s ++ ss)
1551 (addToFM done key [s]) }
1553 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1555 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1556 mkRootMap summaries = addListToFM_C (++) emptyFM
1557 [ (msKey s, [s]) | s <- summaries ]
1559 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1560 -- (msDeps s) returns the dependencies of the ModSummary s.
1561 -- A wrinkle is that for a {-# SOURCE #-} import we return
1562 -- *both* the hs-boot file
1563 -- *and* the source file
1564 -- as "dependencies". That ensures that the list of all relevant
1565 -- modules always contains B.hs if it contains B.hs-boot.
1566 -- Remember, this pass isn't doing the topological sort. It's
1567 -- just gathering the list of all relevant ModSummaries
1569 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1570 ++ [ (m,False) | m <- ms_imps s ]
1572 -----------------------------------------------------------------------------
1573 -- Summarising modules
1575 -- We have two types of summarisation:
1577 -- * Summarise a file. This is used for the root module(s) passed to
1578 -- cmLoadModules. The file is read, and used to determine the root
1579 -- module name. The module name may differ from the filename.
1581 -- * Summarise a module. We are given a module name, and must provide
1582 -- a summary. The finder is used to locate the file in which the module
1587 -> [ModSummary] -- old summaries
1588 -> FilePath -- source file name
1589 -> Maybe Phase -- start phase
1590 -> Maybe (StringBuffer,ClockTime)
1593 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1594 -- we can use a cached summary if one is available and the
1595 -- source file hasn't changed, But we have to look up the summary
1596 -- by source file, rather than module name as we do in summarise.
1597 | Just old_summary <- findSummaryBySourceFile old_summaries file
1599 let location = ms_location old_summary
1601 -- return the cached summary if the source didn't change
1602 src_timestamp <- case maybe_buf of
1603 Just (_,t) -> return t
1604 Nothing -> getModificationTime file
1605 -- The file exists; we checked in getRootSummary above.
1606 -- If it gets removed subsequently, then this
1607 -- getModificationTime may fail, but that's the right
1610 if ms_hs_date old_summary == src_timestamp
1611 then do -- update the object-file timestamp
1612 obj_timestamp <- getObjTimestamp location False
1613 return old_summary{ ms_obj_date = obj_timestamp }
1621 let dflags = hsc_dflags hsc_env
1623 (dflags', hspp_fn, buf)
1624 <- preprocessFile dflags file mb_phase maybe_buf
1626 (srcimps,the_imps, L _ mod_name) <- getImports dflags' buf hspp_fn file
1628 -- Make a ModLocation for this file
1629 location <- mkHomeModLocation dflags mod_name file
1631 -- Tell the Finder cache where it is, so that subsequent calls
1632 -- to findModule will find it, even if it's not on any search path
1633 mod <- addHomeModuleToFinder hsc_env mod_name location
1635 src_timestamp <- case maybe_buf of
1636 Just (_,t) -> return t
1637 Nothing -> getModificationTime file
1638 -- getMofificationTime may fail
1640 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1642 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1643 ms_location = location,
1644 ms_hspp_file = hspp_fn,
1645 ms_hspp_opts = dflags',
1646 ms_hspp_buf = Just buf,
1647 ms_srcimps = srcimps, ms_imps = the_imps,
1648 ms_hs_date = src_timestamp,
1649 ms_obj_date = obj_timestamp })
1651 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1652 findSummaryBySourceFile summaries file
1653 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1654 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
1658 -- Summarise a module, and pick up source and timestamp.
1661 -> NodeMap ModSummary -- Map of old summaries
1662 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1663 -> Located ModuleName -- Imported module to be summarised
1664 -> Maybe (StringBuffer, ClockTime)
1665 -> [ModuleName] -- Modules to exclude
1666 -> IO (Maybe ModSummary) -- Its new summary
1668 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1669 | wanted_mod `elem` excl_mods
1672 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1673 = do -- Find its new timestamp; all the
1674 -- ModSummaries in the old map have valid ml_hs_files
1675 let location = ms_location old_summary
1676 src_fn = expectJust "summariseModule" (ml_hs_file location)
1678 -- check the modification time on the source file, and
1679 -- return the cached summary if it hasn't changed. If the
1680 -- file has disappeared, we need to call the Finder again.
1682 Just (_,t) -> check_timestamp old_summary location src_fn t
1684 m <- System.IO.Error.try (getModificationTime src_fn)
1686 Right t -> check_timestamp old_summary location src_fn t
1687 Left e | isDoesNotExistError e -> find_it
1688 | otherwise -> ioError e
1690 | otherwise = find_it
1692 dflags = hsc_dflags hsc_env
1694 hsc_src = if is_boot then HsBootFile else HsSrcFile
1696 check_timestamp old_summary location src_fn src_timestamp
1697 | ms_hs_date old_summary == src_timestamp = do
1698 -- update the object-file timestamp
1699 obj_timestamp <- getObjTimestamp location is_boot
1700 return (Just old_summary{ ms_obj_date = obj_timestamp })
1702 -- source changed: re-summarise.
1703 new_summary location (ms_mod old_summary) src_fn src_timestamp
1706 -- Don't use the Finder's cache this time. If the module was
1707 -- previously a package module, it may have now appeared on the
1708 -- search path, so we want to consider it to be a home module. If
1709 -- the module was previously a home module, it may have moved.
1710 uncacheModule hsc_env wanted_mod
1711 found <- findImportedModule hsc_env wanted_mod Nothing
1714 | isJust (ml_hs_file location) ->
1716 just_found location mod
1718 -- Drop external-pkg
1719 ASSERT(modulePackageId mod /= thisPackage dflags)
1723 err -> noModError dflags loc wanted_mod err
1726 just_found location mod = do
1727 -- Adjust location to point to the hs-boot source file,
1728 -- hi file, object file, when is_boot says so
1729 let location' | is_boot = addBootSuffixLocn location
1730 | otherwise = location
1731 src_fn = expectJust "summarise2" (ml_hs_file location')
1733 -- Check that it exists
1734 -- It might have been deleted since the Finder last found it
1735 maybe_t <- modificationTimeIfExists src_fn
1737 Nothing -> noHsFileErr loc src_fn
1738 Just t -> new_summary location' mod src_fn t
1741 new_summary location mod src_fn src_timestamp
1743 -- Preprocess the source file and get its imports
1744 -- The dflags' contains the OPTIONS pragmas
1745 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1746 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn src_fn
1748 when (mod_name /= wanted_mod) $
1749 throwDyn $ mkPlainErrMsg mod_loc $
1750 text "file name does not match module name"
1751 <+> quotes (ppr mod_name)
1753 -- Find the object timestamp, and return the summary
1754 obj_timestamp <- getObjTimestamp location is_boot
1756 return (Just ( ModSummary { ms_mod = mod,
1757 ms_hsc_src = hsc_src,
1758 ms_location = location,
1759 ms_hspp_file = hspp_fn,
1760 ms_hspp_opts = dflags',
1761 ms_hspp_buf = Just buf,
1762 ms_srcimps = srcimps,
1764 ms_hs_date = src_timestamp,
1765 ms_obj_date = obj_timestamp }))
1768 getObjTimestamp :: ModLocation -> Bool -> IO (Maybe ClockTime)
1769 getObjTimestamp location is_boot
1770 = if is_boot then return Nothing
1771 else modificationTimeIfExists (ml_obj_file location)
1774 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1775 -> IO (DynFlags, FilePath, StringBuffer)
1776 preprocessFile dflags src_fn mb_phase Nothing
1778 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1779 buf <- hGetStringBuffer hspp_fn
1780 return (dflags', hspp_fn, buf)
1782 preprocessFile dflags src_fn mb_phase (Just (buf, _time))
1784 -- case we bypass the preprocessing stage?
1786 local_opts = getOptions buf src_fn
1788 (dflags', _errs) <- parseDynamicFlags dflags (map unLoc local_opts)
1789 -- XXX: shouldn't we be reporting the errors?
1793 | Just (Unlit _) <- mb_phase = True
1794 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1795 -- note: local_opts is only required if there's no Unlit phase
1796 | dopt Opt_Cpp dflags' = True
1797 | dopt Opt_Pp dflags' = True
1800 when needs_preprocessing $
1801 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1803 return (dflags', src_fn, buf)
1806 -----------------------------------------------------------------------------
1808 -----------------------------------------------------------------------------
1810 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
1811 -- ToDo: we don't have a proper line number for this error
1812 noModError dflags loc wanted_mod err
1813 = throwDyn $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
1815 noHsFileErr :: SrcSpan -> String -> a
1816 noHsFileErr loc path
1817 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1819 packageModErr :: ModuleName -> a
1821 = throwDyn $ mkPlainErrMsg noSrcSpan $
1822 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1824 multiRootsErr :: [ModSummary] -> IO ()
1825 multiRootsErr [] = panic "multiRootsErr"
1826 multiRootsErr summs@(summ1:_)
1827 = throwDyn $ mkPlainErrMsg noSrcSpan $
1828 text "module" <+> quotes (ppr mod) <+>
1829 text "is defined in multiple files:" <+>
1830 sep (map text files)
1833 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1835 cyclicModuleErr :: [ModSummary] -> SDoc
1837 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1838 2 (vcat (map show_one ms))
1840 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1841 nest 2 $ ptext SLIT("imports:") <+>
1842 (pp_imps HsBootFile (ms_srcimps ms)
1843 $$ pp_imps HsSrcFile (ms_imps ms))]
1844 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1845 pp_imps src mods = fsep (map (show_mod src) mods)
1848 -- | Inform GHC that the working directory has changed. GHC will flush
1849 -- its cache of module locations, since it may no longer be valid.
1850 -- Note: if you change the working directory, you should also unload
1851 -- the current program (set targets to empty, followed by load).
1852 workingDirectoryChanged :: Session -> IO ()
1853 workingDirectoryChanged s = withSession s $ flushFinderCaches
1855 -- -----------------------------------------------------------------------------
1856 -- inspecting the session
1858 -- | Get the module dependency graph.
1859 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1860 getModuleGraph s = withSession s (return . hsc_mod_graph)
1862 isLoaded :: Session -> ModuleName -> IO Bool
1863 isLoaded s m = withSession s $ \hsc_env ->
1864 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
1866 getBindings :: Session -> IO [TyThing]
1867 getBindings s = withSession s $ \hsc_env ->
1868 -- we have to implement the shadowing behaviour of ic_tmp_ids here
1869 -- (see InteractiveContext) and the quickest way is to use an OccEnv.
1871 tmp_ids = ic_tmp_ids (hsc_IC hsc_env)
1872 filtered = foldr f (const []) tmp_ids emptyUniqSet
1874 | uniq `elementOfUniqSet` set = rest set
1875 | otherwise = AnId id : rest (addOneToUniqSet set uniq)
1876 where uniq = getUnique (nameOccName (idName id))
1880 getPrintUnqual :: Session -> IO PrintUnqualified
1881 getPrintUnqual s = withSession s $ \hsc_env ->
1882 return (icPrintUnqual (hsc_dflags hsc_env) (hsc_IC hsc_env))
1884 -- | Container for information about a 'Module'.
1885 data ModuleInfo = ModuleInfo {
1886 minf_type_env :: TypeEnv,
1887 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
1888 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1889 minf_instances :: [Instance]
1891 ,minf_modBreaks :: ModBreaks
1893 -- ToDo: this should really contain the ModIface too
1895 -- We don't want HomeModInfo here, because a ModuleInfo applies
1896 -- to package modules too.
1898 -- | Request information about a loaded 'Module'
1899 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1900 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1901 let mg = hsc_mod_graph hsc_env
1902 if mdl `elem` map ms_mod mg
1903 then getHomeModuleInfo hsc_env (moduleName mdl)
1905 {- if isHomeModule (hsc_dflags hsc_env) mdl
1907 else -} getPackageModuleInfo hsc_env mdl
1908 -- getPackageModuleInfo will attempt to find the interface, so
1909 -- we don't want to call it for a home module, just in case there
1910 -- was a problem loading the module and the interface doesn't
1911 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1913 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1915 getPackageModuleInfo hsc_env mdl = do
1916 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
1918 Nothing -> return Nothing
1920 eps <- readIORef (hsc_EPS hsc_env)
1922 names = availsToNameSet avails
1924 tys = [ ty | name <- concatMap availNames avails,
1925 Just ty <- [lookupTypeEnv pte name] ]
1927 return (Just (ModuleInfo {
1928 minf_type_env = mkTypeEnv tys,
1929 minf_exports = names,
1930 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
1931 minf_instances = error "getModuleInfo: instances for package module unimplemented",
1932 minf_modBreaks = emptyModBreaks
1935 getPackageModuleInfo _hsc_env _mdl = do
1936 -- bogusly different for non-GHCI (ToDo)
1940 getHomeModuleInfo :: HscEnv -> ModuleName -> IO (Maybe ModuleInfo)
1941 getHomeModuleInfo hsc_env mdl =
1942 case lookupUFM (hsc_HPT hsc_env) mdl of
1943 Nothing -> return Nothing
1945 let details = hm_details hmi
1946 return (Just (ModuleInfo {
1947 minf_type_env = md_types details,
1948 minf_exports = availsToNameSet (md_exports details),
1949 minf_rdr_env = mi_globals $! hm_iface hmi,
1950 minf_instances = md_insts details
1952 ,minf_modBreaks = getModBreaks hmi
1956 -- | The list of top-level entities defined in a module
1957 modInfoTyThings :: ModuleInfo -> [TyThing]
1958 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1960 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1961 modInfoTopLevelScope minf
1962 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1964 modInfoExports :: ModuleInfo -> [Name]
1965 modInfoExports minf = nameSetToList $! minf_exports minf
1967 -- | Returns the instances defined by the specified module.
1968 -- Warning: currently unimplemented for package modules.
1969 modInfoInstances :: ModuleInfo -> [Instance]
1970 modInfoInstances = minf_instances
1972 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1973 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1975 mkPrintUnqualifiedForModule :: Session -> ModuleInfo -> IO (Maybe PrintUnqualified)
1976 mkPrintUnqualifiedForModule s minf = withSession s $ \hsc_env -> do
1977 return (fmap (mkPrintUnqualified (hsc_dflags hsc_env)) (minf_rdr_env minf))
1979 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1980 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1981 case lookupTypeEnv (minf_type_env minf) name of
1982 Just tyThing -> return (Just tyThing)
1984 eps <- readIORef (hsc_EPS hsc_env)
1985 return $! lookupType (hsc_dflags hsc_env)
1986 (hsc_HPT hsc_env) (eps_PTE eps) name
1989 modInfoModBreaks :: ModuleInfo -> ModBreaks
1990 modInfoModBreaks = minf_modBreaks
1993 isDictonaryId :: Id -> Bool
1995 = case tcSplitSigmaTy (idType id) of { (_tvs, _theta, tau) -> isDictTy tau }
1997 -- | Looks up a global name: that is, any top-level name in any
1998 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1999 -- the interactive context, and therefore does not require a preceding
2001 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
2002 lookupGlobalName s name = withSession s $ \hsc_env -> do
2003 eps <- readIORef (hsc_EPS hsc_env)
2004 return $! lookupType (hsc_dflags hsc_env)
2005 (hsc_HPT hsc_env) (eps_PTE eps) name
2007 -- -----------------------------------------------------------------------------
2008 -- Misc exported utils
2010 dataConType :: DataCon -> Type
2011 dataConType dc = idType (dataConWrapId dc)
2013 -- | print a 'NamedThing', adding parentheses if the name is an operator.
2014 pprParenSymName :: NamedThing a => a -> SDoc
2015 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
2017 -- ----------------------------------------------------------------------------
2022 -- - Data and Typeable instances for HsSyn.
2024 -- ToDo: check for small transformations that happen to the syntax in
2025 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
2027 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
2028 -- to get from TyCons, Ids etc. to TH syntax (reify).
2030 -- :browse will use either lm_toplev or inspect lm_interface, depending
2031 -- on whether the module is interpreted or not.
2033 -- This is for reconstructing refactored source code
2034 -- Calls the lexer repeatedly.
2035 -- ToDo: add comment tokens to token stream
2036 getTokenStream :: Session -> Module -> IO [Located Token]
2039 -- -----------------------------------------------------------------------------
2040 -- Interactive evaluation
2042 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
2043 -- filesystem and package database to find the corresponding 'Module',
2044 -- using the algorithm that is used for an @import@ declaration.
2045 findModule :: Session -> ModuleName -> Maybe PackageId -> IO Module
2046 findModule s mod_name maybe_pkg = withSession s $ \hsc_env ->
2048 dflags = hsc_dflags hsc_env
2049 hpt = hsc_HPT hsc_env
2050 this_pkg = thisPackage dflags
2052 case lookupUFM hpt mod_name of
2053 Just mod_info -> return (mi_module (hm_iface mod_info))
2054 _not_a_home_module -> do
2055 res <- findImportedModule hsc_env mod_name maybe_pkg
2057 Found _ m | modulePackageId m /= this_pkg -> return m
2058 | otherwise -> throwDyn (CmdLineError (showSDoc $
2059 text "module" <+> pprModule m <+>
2060 text "is not loaded"))
2061 err -> let msg = cannotFindModule dflags mod_name err in
2062 throwDyn (CmdLineError (showSDoc msg))
2065 getHistorySpan :: Session -> History -> IO SrcSpan
2066 getHistorySpan sess h = withSession sess $ \hsc_env ->
2067 return$ InteractiveEval.getHistorySpan hsc_env h
2069 obtainTerm :: Session -> Bool -> Id -> IO Term
2070 obtainTerm sess force id = withSession sess $ \hsc_env ->
2071 InteractiveEval.obtainTerm hsc_env force id
2073 obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term
2074 obtainTerm1 sess force mb_ty a = withSession sess $ \hsc_env ->
2075 InteractiveEval.obtainTerm1 hsc_env force mb_ty a
2077 obtainTermB :: Session -> Int -> Bool -> Id -> IO Term
2078 obtainTermB sess bound force id = withSession sess $ \hsc_env ->
2079 InteractiveEval.obtainTermB hsc_env bound force id