1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
16 -- * Flags and settings
17 DynFlags(..), DynFlag(..), Severity(..), HscTarget(..), dopt,
18 GhcMode(..), GhcLink(..),
24 Target(..), TargetId(..), Phase,
31 -- * Extending the program scope
32 extendGlobalRdrScope, -- :: Session -> [GlobalRdrElt] -> IO ()
33 setGlobalRdrScope, -- :: Session -> [GlobalRdrElt] -> IO ()
34 extendGlobalTypeScope, -- :: Session -> [Id] -> IO ()
35 setGlobalTypeScope, -- :: Session -> [Id] -> IO ()
37 -- * Loading\/compiling the program
39 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
40 workingDirectoryChanged,
41 checkModule, CheckedModule(..),
42 TypecheckedSource, ParsedSource, RenamedSource,
44 -- * Parsing Haddock comments
47 -- * Inspecting the module structure of the program
48 ModuleGraph, ModSummary(..), ms_mod_name, ModLocation(..),
53 -- * Inspecting modules
58 modInfoPrintUnqualified,
61 modInfoIsExportedName,
66 PrintUnqualified, alwaysQualify,
68 -- * Interactive evaluation
69 getBindings, getPrintUnqual,
72 setContext, getContext,
80 RunResult(..), ResumeHandle,
85 compileExpr, HValue, dynCompileExpr,
87 obtainTerm, obtainTerm1,
88 ModBreaks(..), BreakIndex,
89 BreakInfo(breakInfo_number, breakInfo_module),
90 BreakArray, setBreakOn, setBreakOff, getBreak,
94 -- * Abstract syntax elements
100 Module, mkModule, pprModule, moduleName, modulePackageId,
101 ModuleName, mkModuleName, moduleNameString,
105 nameModule, pprParenSymName, nameSrcLoc,
107 RdrName(Qual,Unqual),
111 isImplicitId, isDeadBinder,
112 isExportedId, isLocalId, isGlobalId,
114 isPrimOpId, isFCallId, isClassOpId_maybe,
115 isDataConWorkId, idDataCon,
116 isBottomingId, isDictonaryId,
117 recordSelectorFieldLabel,
119 -- ** Type constructors
121 tyConTyVars, tyConDataCons, tyConArity,
122 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
124 synTyConDefn, synTyConType, synTyConResKind,
130 -- ** Data constructors
132 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
133 dataConIsInfix, isVanillaDataCon,
135 StrictnessMark(..), isMarkedStrict,
139 classMethods, classSCTheta, classTvsFds,
144 instanceDFunId, pprInstance, pprInstanceHdr,
146 -- ** Types and Kinds
147 Type, dropForAlls, splitForAllTys, funResultTy,
148 pprParendType, pprTypeApp,
151 ThetaType, pprThetaArrow,
157 module HsSyn, -- ToDo: remove extraneous bits
161 defaultFixity, maxPrecedence,
165 -- ** Source locations
167 mkSrcLoc, isGoodSrcLoc,
168 srcLocFile, srcLocLine, srcLocCol,
170 mkSrcSpan, srcLocSpan,
171 srcSpanStart, srcSpanEnd,
173 srcSpanStartLine, srcSpanEndLine,
174 srcSpanStartCol, srcSpanEndCol,
177 GhcException(..), showGhcException,
187 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
188 * what StaticFlags should we expose, if any?
191 #include "HsVersions.h"
194 import RtClosureInspect ( cvObtainTerm, Term )
195 import TcRnDriver ( tcRnLookupRdrName, tcRnGetInfo,
196 tcRnLookupName, getModuleExports )
197 import GHC.Exts ( unsafeCoerce#, Ptr )
198 import Foreign.StablePtr( deRefStablePtr, StablePtr, newStablePtr, freeStablePtr )
199 import Foreign ( poke )
200 import qualified Linker
201 import Linker ( HValue )
203 import Data.Dynamic ( Dynamic )
207 import HscMain ( hscParseIdentifier, hscTcExpr, hscKcType, hscStmt )
215 import Type hiding (typeKind)
216 import TcType hiding (typeKind)
218 import Var hiding (setIdType)
221 import TysPrim ( alphaTyVars )
226 import Name hiding ( varName )
227 import OccName ( parenSymOcc )
229 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr )
231 import DriverPipeline
232 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
233 import HeaderInfo ( getImports, getOptions )
235 import HscMain ( newHscEnv, hscFileCheck, HscChecked(..) )
238 import SysTools ( initSysTools, cleanTempFiles, cleanTempFilesExcept,
246 import Bag ( unitBag, listToBag )
247 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
248 mkPlainErrMsg, printBagOfErrors, printBagOfWarnings,
250 import qualified ErrUtils
252 import StringBuffer ( StringBuffer, hGetStringBuffer )
255 import TcType ( tcSplitSigmaTy, isDictTy )
256 import Maybes ( expectJust, mapCatMaybes )
258 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 ( isDoesNotExistError )
275 import Prelude hiding (init)
277 #if __GLASGOW_HASKELL__ < 600
278 import System.IO as System.IO.Error ( try )
280 import System.IO.Error ( try )
283 -- -----------------------------------------------------------------------------
284 -- Exception handlers
286 -- | Install some default exception handlers and run the inner computation.
287 -- Unless you want to handle exceptions yourself, you should wrap this around
288 -- the top level of your program. The default handlers output the error
289 -- message(s) to stderr and exit cleanly.
290 defaultErrorHandler :: DynFlags -> IO a -> IO a
291 defaultErrorHandler dflags inner =
292 -- top-level exception handler: any unrecognised exception is a compiler bug.
293 handle (\exception -> do
296 -- an IO exception probably isn't our fault, so don't panic
298 fatalErrorMsg dflags (text (show exception))
299 AsyncException StackOverflow ->
300 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
302 fatalErrorMsg dflags (text (show (Panic (show exception))))
303 exitWith (ExitFailure 1)
306 -- program errors: messages with locations attached. Sometimes it is
307 -- convenient to just throw these as exceptions.
308 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
309 exitWith (ExitFailure 1)) $
311 -- error messages propagated as exceptions
312 handleDyn (\dyn -> do
315 PhaseFailed _ code -> exitWith code
316 Interrupted -> exitWith (ExitFailure 1)
317 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
318 exitWith (ExitFailure 1)
322 -- | Install a default cleanup handler to remove temporary files
323 -- deposited by a GHC run. This is seperate from
324 -- 'defaultErrorHandler', because you might want to override the error
325 -- handling, but still get the ordinary cleanup behaviour.
326 defaultCleanupHandler :: DynFlags -> IO a -> IO a
327 defaultCleanupHandler dflags inner =
328 -- make sure we clean up after ourselves
329 later (do cleanTempFiles dflags
332 -- exceptions will be blocked while we clean the temporary files,
333 -- so there shouldn't be any difficulty if we receive further
338 -- | Starts a new session. A session consists of a set of loaded
339 -- modules, a set of options (DynFlags), and an interactive context.
340 newSession :: Maybe FilePath -> IO Session
341 newSession mb_top_dir = do
343 main_thread <- myThreadId
344 modifyMVar_ interruptTargetThread (return . (main_thread :))
345 installSignalHandlers
347 dflags0 <- initSysTools mb_top_dir defaultDynFlags
348 dflags <- initDynFlags dflags0
349 env <- newHscEnv dflags
353 -- tmp: this breaks the abstraction, but required because DriverMkDepend
354 -- needs to call the Finder. ToDo: untangle this.
355 sessionHscEnv :: Session -> IO HscEnv
356 sessionHscEnv (Session ref) = readIORef ref
358 withSession :: Session -> (HscEnv -> IO a) -> IO a
359 withSession (Session ref) f = do h <- readIORef ref; f h
361 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
362 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
364 -- -----------------------------------------------------------------------------
367 -- | Grabs the DynFlags from the Session
368 getSessionDynFlags :: Session -> IO DynFlags
369 getSessionDynFlags s = withSession s (return . hsc_dflags)
371 -- | Updates the DynFlags in a Session. This also reads
372 -- the package database (unless it has already been read),
373 -- and prepares the compilers knowledge about packages. It
374 -- can be called again to load new packages: just add new
375 -- package flags to (packageFlags dflags).
377 -- Returns a list of new packages that may need to be linked in using
378 -- the dynamic linker (see 'linkPackages') as a result of new package
379 -- flags. If you are not doing linking or doing static linking, you
380 -- can ignore the list of packages returned.
382 setSessionDynFlags :: Session -> DynFlags -> IO [PackageId]
383 setSessionDynFlags (Session ref) dflags = do
384 hsc_env <- readIORef ref
385 (dflags', preload) <- initPackages dflags
386 writeIORef ref $! hsc_env{ hsc_dflags = dflags' }
389 -- | If there is no -o option, guess the name of target executable
390 -- by using top-level source file name as a base.
391 guessOutputFile :: Session -> IO ()
392 guessOutputFile s = modifySession s $ \env ->
393 let dflags = hsc_dflags env
394 mod_graph = hsc_mod_graph env
395 mainModuleSrcPath, guessedName :: Maybe String
396 mainModuleSrcPath = do
397 let isMain = (== mainModIs dflags) . ms_mod
398 [ms] <- return (filter isMain mod_graph)
399 ml_hs_file (ms_location ms)
400 guessedName = fmap basenameOf mainModuleSrcPath
402 case outputFile dflags of
404 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
406 -- -----------------------------------------------------------------------------
409 -- ToDo: think about relative vs. absolute file paths. And what
410 -- happens when the current directory changes.
412 -- | Sets the targets for this session. Each target may be a module name
413 -- or a filename. The targets correspond to the set of root modules for
414 -- the program\/library. Unloading the current program is achieved by
415 -- setting the current set of targets to be empty, followed by load.
416 setTargets :: Session -> [Target] -> IO ()
417 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
419 -- | returns the current set of targets
420 getTargets :: Session -> IO [Target]
421 getTargets s = withSession s (return . hsc_targets)
423 -- | Add another target
424 addTarget :: Session -> Target -> IO ()
426 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
429 removeTarget :: Session -> TargetId -> IO ()
430 removeTarget s target_id
431 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
433 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
435 -- Attempts to guess what Target a string refers to. This function implements
436 -- the --make/GHCi command-line syntax for filenames:
438 -- - if the string looks like a Haskell source filename, then interpret
440 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
442 -- - otherwise interpret the string as a module name
444 guessTarget :: String -> Maybe Phase -> IO Target
445 guessTarget file (Just phase)
446 = return (Target (TargetFile file (Just phase)) Nothing)
447 guessTarget file Nothing
448 | isHaskellSrcFilename file
449 = return (Target (TargetFile file Nothing) Nothing)
451 = do exists <- doesFileExist hs_file
453 then return (Target (TargetFile hs_file Nothing) Nothing)
455 exists <- doesFileExist lhs_file
457 then return (Target (TargetFile lhs_file Nothing) Nothing)
459 return (Target (TargetModule (mkModuleName file)) Nothing)
461 hs_file = file `joinFileExt` "hs"
462 lhs_file = file `joinFileExt` "lhs"
464 -- -----------------------------------------------------------------------------
465 -- Extending the program scope
467 extendGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
468 extendGlobalRdrScope session rdrElts
469 = modifySession session $ \hscEnv ->
470 let global_rdr = hsc_global_rdr_env hscEnv
471 in hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv global_rdr rdrElts }
473 setGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
474 setGlobalRdrScope session rdrElts
475 = modifySession session $ \hscEnv ->
476 hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv emptyGlobalRdrEnv rdrElts }
478 extendGlobalTypeScope :: Session -> [Id] -> IO ()
479 extendGlobalTypeScope session ids
480 = modifySession session $ \hscEnv ->
481 let global_type = hsc_global_type_env hscEnv
482 in hscEnv{ hsc_global_type_env = extendTypeEnvWithIds global_type ids }
484 setGlobalTypeScope :: Session -> [Id] -> IO ()
485 setGlobalTypeScope session ids
486 = modifySession session $ \hscEnv ->
487 hscEnv{ hsc_global_type_env = extendTypeEnvWithIds emptyTypeEnv ids }
489 -- -----------------------------------------------------------------------------
490 -- Parsing Haddock comments
492 parseHaddockComment :: String -> Either String (HsDoc RdrName)
493 parseHaddockComment string = parseHaddockParagraphs (tokenise string)
495 -- -----------------------------------------------------------------------------
496 -- Loading the program
498 -- Perform a dependency analysis starting from the current targets
499 -- and update the session with the new module graph.
500 depanal :: Session -> [ModuleName] -> Bool -> IO (Maybe ModuleGraph)
501 depanal (Session ref) excluded_mods allow_dup_roots = do
502 hsc_env <- readIORef ref
504 dflags = hsc_dflags hsc_env
505 targets = hsc_targets hsc_env
506 old_graph = hsc_mod_graph hsc_env
508 showPass dflags "Chasing dependencies"
509 debugTraceMsg dflags 2 (hcat [
510 text "Chasing modules from: ",
511 hcat (punctuate comma (map pprTarget targets))])
513 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
515 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
520 -- | The result of load.
522 = LoadOk Errors -- ^ all specified targets were loaded successfully.
523 | LoadFailed Errors -- ^ not all modules were loaded.
525 type Errors = [String]
527 data ErrMsg = ErrMsg {
528 errMsgSeverity :: Severity, -- warning, error, etc.
529 errMsgSpans :: [SrcSpan],
530 errMsgShortDoc :: Doc,
531 errMsgExtraInfo :: Doc
537 | LoadUpTo ModuleName
538 | LoadDependenciesOf ModuleName
540 -- | Try to load the program. If a Module is supplied, then just
541 -- attempt to load up to this target. If no Module is supplied,
542 -- then try to load all targets.
543 load :: Session -> LoadHowMuch -> IO SuccessFlag
544 load s@(Session ref) how_much
546 -- Dependency analysis first. Note that this fixes the module graph:
547 -- even if we don't get a fully successful upsweep, the full module
548 -- graph is still retained in the Session. We can tell which modules
549 -- were successfully loaded by inspecting the Session's HPT.
550 mb_graph <- depanal s [] False
552 Just mod_graph -> load2 s how_much mod_graph
553 Nothing -> return Failed
555 load2 s@(Session ref) how_much mod_graph = do
557 hsc_env <- readIORef ref
559 let hpt1 = hsc_HPT hsc_env
560 let dflags = hsc_dflags hsc_env
562 -- The "bad" boot modules are the ones for which we have
563 -- B.hs-boot in the module graph, but no B.hs
564 -- The downsweep should have ensured this does not happen
566 let all_home_mods = [ms_mod_name s
567 | s <- mod_graph, not (isBootSummary s)]
569 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
570 not (ms_mod_name s `elem` all_home_mods)]
572 ASSERT( null bad_boot_mods ) return ()
574 -- mg2_with_srcimps drops the hi-boot nodes, returning a
575 -- graph with cycles. Among other things, it is used for
576 -- backing out partially complete cycles following a failed
577 -- upsweep, and for removing from hpt all the modules
578 -- not in strict downwards closure, during calls to compile.
579 let mg2_with_srcimps :: [SCC ModSummary]
580 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
582 -- If we can determine that any of the {-# SOURCE #-} imports
583 -- are definitely unnecessary, then emit a warning.
584 warnUnnecessarySourceImports dflags mg2_with_srcimps
587 -- check the stability property for each module.
588 stable_mods@(stable_obj,stable_bco)
589 = checkStability hpt1 mg2_with_srcimps all_home_mods
591 -- prune bits of the HPT which are definitely redundant now,
593 pruned_hpt = pruneHomePackageTable hpt1
594 (flattenSCCs mg2_with_srcimps)
599 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
600 text "Stable BCO:" <+> ppr stable_bco)
602 -- Unload any modules which are going to be re-linked this time around.
603 let stable_linkables = [ linkable
604 | m <- stable_obj++stable_bco,
605 Just hmi <- [lookupUFM pruned_hpt m],
606 Just linkable <- [hm_linkable hmi] ]
607 unload hsc_env stable_linkables
609 -- We could at this point detect cycles which aren't broken by
610 -- a source-import, and complain immediately, but it seems better
611 -- to let upsweep_mods do this, so at least some useful work gets
612 -- done before the upsweep is abandoned.
613 --hPutStrLn stderr "after tsort:\n"
614 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
616 -- Now do the upsweep, calling compile for each module in
617 -- turn. Final result is version 3 of everything.
619 -- Topologically sort the module graph, this time including hi-boot
620 -- nodes, and possibly just including the portion of the graph
621 -- reachable from the module specified in the 2nd argument to load.
622 -- This graph should be cycle-free.
623 -- If we're restricting the upsweep to a portion of the graph, we
624 -- also want to retain everything that is still stable.
625 let full_mg :: [SCC ModSummary]
626 full_mg = topSortModuleGraph False mod_graph Nothing
628 maybe_top_mod = case how_much of
630 LoadDependenciesOf m -> Just m
633 partial_mg0 :: [SCC ModSummary]
634 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
636 -- LoadDependenciesOf m: we want the upsweep to stop just
637 -- short of the specified module (unless the specified module
640 | LoadDependenciesOf mod <- how_much
641 = ASSERT( case last partial_mg0 of
642 AcyclicSCC ms -> ms_mod_name ms == mod; _ -> False )
643 List.init partial_mg0
649 | AcyclicSCC ms <- full_mg,
650 ms_mod_name ms `elem` stable_obj++stable_bco,
651 ms_mod_name ms `notElem` [ ms_mod_name ms' |
652 AcyclicSCC ms' <- partial_mg ] ]
654 mg = stable_mg ++ partial_mg
656 -- clean up between compilations
657 let cleanup = cleanTempFilesExcept dflags
658 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
660 debugTraceMsg dflags 2 (hang (text "Ready for upsweep")
662 (upsweep_ok, hsc_env1, modsUpswept)
663 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
664 pruned_hpt stable_mods cleanup mg
666 -- Make modsDone be the summaries for each home module now
667 -- available; this should equal the domain of hpt3.
668 -- Get in in a roughly top .. bottom order (hence reverse).
670 let modsDone = reverse modsUpswept
672 -- Try and do linking in some form, depending on whether the
673 -- upsweep was completely or only partially successful.
675 if succeeded upsweep_ok
678 -- Easy; just relink it all.
679 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
681 -- Clean up after ourselves
682 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
684 -- Issue a warning for the confusing case where the user
685 -- said '-o foo' but we're not going to do any linking.
686 -- We attempt linking if either (a) one of the modules is
687 -- called Main, or (b) the user said -no-hs-main, indicating
688 -- that main() is going to come from somewhere else.
690 let ofile = outputFile dflags
691 let no_hs_main = dopt Opt_NoHsMain dflags
693 main_mod = mainModIs dflags
694 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
695 do_linking = a_root_is_Main || no_hs_main
697 when (ghcLink dflags == LinkBinary
698 && isJust ofile && not do_linking) $
699 debugTraceMsg dflags 1 $
700 text ("Warning: output was redirected with -o, " ++
701 "but no output will be generated\n" ++
702 "because there is no " ++
703 moduleNameString (moduleName main_mod) ++ " module.")
705 -- link everything together
706 linkresult <- link (ghcLink dflags) dflags do_linking (hsc_HPT hsc_env1)
708 loadFinish Succeeded linkresult ref hsc_env1
711 -- Tricky. We need to back out the effects of compiling any
712 -- half-done cycles, both so as to clean up the top level envs
713 -- and to avoid telling the interactive linker to link them.
714 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
717 = map ms_mod modsDone
718 let mods_to_zap_names
719 = findPartiallyCompletedCycles modsDone_names
722 = filter ((`notElem` mods_to_zap_names).ms_mod)
725 let hpt4 = retainInTopLevelEnvs (map ms_mod_name mods_to_keep)
728 -- Clean up after ourselves
729 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
731 -- there should be no Nothings where linkables should be, now
732 ASSERT(all (isJust.hm_linkable)
733 (eltsUFM (hsc_HPT hsc_env))) do
735 -- Link everything together
736 linkresult <- link (ghcLink dflags) dflags False hpt4
738 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
739 loadFinish Failed linkresult ref hsc_env4
741 -- Finish up after a load.
743 -- If the link failed, unload everything and return.
744 loadFinish all_ok Failed ref hsc_env
745 = do unload hsc_env []
746 writeIORef ref $! discardProg hsc_env
749 -- Empty the interactive context and set the module context to the topmost
750 -- newly loaded module, or the Prelude if none were loaded.
751 loadFinish all_ok Succeeded ref hsc_env
752 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
756 -- Forget the current program, but retain the persistent info in HscEnv
757 discardProg :: HscEnv -> HscEnv
759 = hsc_env { hsc_mod_graph = emptyMG,
760 hsc_IC = emptyInteractiveContext,
761 hsc_HPT = emptyHomePackageTable }
763 -- used to fish out the preprocess output files for the purposes of
764 -- cleaning up. The preprocessed file *might* be the same as the
765 -- source file, but that doesn't do any harm.
766 ppFilesFromSummaries summaries = map ms_hspp_file summaries
768 -- -----------------------------------------------------------------------------
772 CheckedModule { parsedSource :: ParsedSource,
773 renamedSource :: Maybe RenamedSource,
774 typecheckedSource :: Maybe TypecheckedSource,
775 checkedModuleInfo :: Maybe ModuleInfo
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' loads all the dependencies of the specified
803 -- module in the Session, and then attempts to typecheck the module. If
804 -- successful, it returns the abstract syntax for the module.
805 checkModule :: Session -> ModuleName -> IO (Maybe CheckedModule)
806 checkModule session@(Session ref) mod = do
807 -- load up the dependencies first
808 r <- load session (LoadDependenciesOf mod)
809 if (failed r) then return Nothing else do
811 -- now parse & typecheck the module
812 hsc_env <- readIORef ref
813 let mg = hsc_mod_graph hsc_env
814 case [ ms | ms <- mg, ms_mod_name ms == mod ] of
817 mbChecked <- hscFileCheck hsc_env{hsc_dflags=ms_hspp_opts ms} ms
819 Nothing -> return Nothing
820 Just (HscChecked parsed renamed Nothing) ->
821 return (Just (CheckedModule {
822 parsedSource = parsed,
823 renamedSource = renamed,
824 typecheckedSource = Nothing,
825 checkedModuleInfo = Nothing }))
826 Just (HscChecked parsed renamed
827 (Just (tc_binds, rdr_env, details))) -> 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 }))
844 -- ---------------------------------------------------------------------------
847 unload :: HscEnv -> [Linkable] -> IO ()
848 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
849 = case ghcLink (hsc_dflags hsc_env) of
851 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
853 LinkInMemory -> panic "unload: no interpreter"
857 -- -----------------------------------------------------------------------------
861 Stability tells us which modules definitely do not need to be recompiled.
862 There are two main reasons for having stability:
864 - avoid doing a complete upsweep of the module graph in GHCi when
865 modules near the bottom of the tree have not changed.
867 - to tell GHCi when it can load object code: we can only load object code
868 for a module when we also load object code fo all of the imports of the
869 module. So we need to know that we will definitely not be recompiling
870 any of these modules, and we can use the object code.
872 The stability check is as follows. Both stableObject and
873 stableBCO are used during the upsweep phase later.
876 stable m = stableObject m || stableBCO m
879 all stableObject (imports m)
880 && old linkable does not exist, or is == on-disk .o
881 && date(on-disk .o) > date(.hs)
884 all stable (imports m)
885 && date(BCO) > date(.hs)
888 These properties embody the following ideas:
890 - if a module is stable, then:
891 - if it has been compiled in a previous pass (present in HPT)
892 then it does not need to be compiled or re-linked.
893 - if it has not been compiled in a previous pass,
894 then we only need to read its .hi file from disk and
895 link it to produce a ModDetails.
897 - if a modules is not stable, we will definitely be at least
898 re-linking, and possibly re-compiling it during the upsweep.
899 All non-stable modules can (and should) therefore be unlinked
902 - Note that objects are only considered stable if they only depend
903 on other objects. We can't link object code against byte code.
907 :: HomePackageTable -- HPT from last compilation
908 -> [SCC ModSummary] -- current module graph (cyclic)
909 -> [ModuleName] -- all home modules
910 -> ([ModuleName], -- stableObject
911 [ModuleName]) -- stableBCO
913 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
915 checkSCC (stable_obj, stable_bco) scc0
916 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
917 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
918 | otherwise = (stable_obj, stable_bco)
920 scc = flattenSCC scc0
921 scc_mods = map ms_mod_name scc
922 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
924 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
925 -- all imports outside the current SCC, but in the home pkg
927 stable_obj_imps = map (`elem` stable_obj) scc_allimps
928 stable_bco_imps = map (`elem` stable_bco) scc_allimps
935 and (zipWith (||) stable_obj_imps stable_bco_imps)
939 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
943 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
944 Just hmi | Just l <- hm_linkable hmi
945 -> isObjectLinkable l && t == linkableTime l
947 -- why '>=' rather than '>' above? If the filesystem stores
948 -- times to the nearset second, we may occasionally find that
949 -- the object & source have the same modification time,
950 -- especially if the source was automatically generated
951 -- and compiled. Using >= is slightly unsafe, but it matches
955 = case lookupUFM hpt (ms_mod_name ms) of
956 Just hmi | Just l <- hm_linkable hmi ->
957 not (isObjectLinkable l) &&
958 linkableTime l >= ms_hs_date ms
961 ms_allimps :: ModSummary -> [ModuleName]
962 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
964 -- -----------------------------------------------------------------------------
965 -- Prune the HomePackageTable
967 -- Before doing an upsweep, we can throw away:
969 -- - For non-stable modules:
970 -- - all ModDetails, all linked code
971 -- - all unlinked code that is out of date with respect to
974 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
975 -- space at the end of the upsweep, because the topmost ModDetails of the
976 -- old HPT holds on to the entire type environment from the previous
979 pruneHomePackageTable
982 -> ([ModuleName],[ModuleName])
985 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
988 | is_stable modl = hmi'
989 | otherwise = hmi'{ hm_details = emptyModDetails }
991 modl = moduleName (mi_module (hm_iface hmi))
992 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
993 = hmi{ hm_linkable = Nothing }
996 where ms = expectJust "prune" (lookupUFM ms_map modl)
998 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
1000 is_stable m = m `elem` stable_obj || m `elem` stable_bco
1002 -- -----------------------------------------------------------------------------
1004 -- Return (names of) all those in modsDone who are part of a cycle
1005 -- as defined by theGraph.
1006 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1007 findPartiallyCompletedCycles modsDone theGraph
1011 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
1012 chew ((CyclicSCC vs):rest)
1013 = let names_in_this_cycle = nub (map ms_mod vs)
1015 = nub ([done | done <- modsDone,
1016 done `elem` names_in_this_cycle])
1017 chewed_rest = chew rest
1019 if notNull mods_in_this_cycle
1020 && length mods_in_this_cycle < length names_in_this_cycle
1021 then mods_in_this_cycle ++ chewed_rest
1024 -- -----------------------------------------------------------------------------
1027 -- This is where we compile each module in the module graph, in a pass
1028 -- from the bottom to the top of the graph.
1030 -- There better had not be any cyclic groups here -- we check for them.
1033 :: HscEnv -- Includes initially-empty HPT
1034 -> HomePackageTable -- HPT from last time round (pruned)
1035 -> ([ModuleName],[ModuleName]) -- stable modules (see checkStability)
1036 -> IO () -- How to clean up unwanted tmp files
1037 -> [SCC ModSummary] -- Mods to do (the worklist)
1039 HscEnv, -- With an updated HPT
1040 [ModSummary]) -- Mods which succeeded
1042 upsweep hsc_env old_hpt stable_mods cleanup mods
1043 = upsweep' hsc_env old_hpt stable_mods cleanup mods 1 (length mods)
1045 upsweep' hsc_env old_hpt stable_mods cleanup
1047 = return (Succeeded, hsc_env, [])
1049 upsweep' hsc_env old_hpt stable_mods cleanup
1050 (CyclicSCC ms:_) _ _
1051 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1052 return (Failed, hsc_env, [])
1054 upsweep' hsc_env old_hpt stable_mods cleanup
1055 (AcyclicSCC mod:mods) mod_index nmods
1056 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1057 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1058 -- (moduleEnvElts (hsc_HPT hsc_env)))
1060 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1063 cleanup -- Remove unwanted tmp files between compilations
1066 Nothing -> return (Failed, hsc_env, [])
1068 { let this_mod = ms_mod_name mod
1070 -- Add new info to hsc_env
1071 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1072 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1074 -- Space-saving: delete the old HPT entry
1075 -- for mod BUT if mod is a hs-boot
1076 -- node, don't delete it. For the
1077 -- interface, the HPT entry is probaby for the
1078 -- main Haskell source file. Deleting it
1079 -- would force .. (what?? --SDM)
1080 old_hpt1 | isBootSummary mod = old_hpt
1081 | otherwise = delFromUFM old_hpt this_mod
1083 ; (restOK, hsc_env2, modOKs)
1084 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1085 mods (mod_index+1) nmods
1086 ; return (restOK, hsc_env2, mod:modOKs)
1090 -- Compile a single module. Always produce a Linkable for it if
1091 -- successful. If no compilation happened, return the old Linkable.
1092 upsweep_mod :: HscEnv
1094 -> ([ModuleName],[ModuleName])
1096 -> Int -- index of module
1097 -> Int -- total number of modules
1098 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1100 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1102 this_mod_name = ms_mod_name summary
1103 this_mod = ms_mod summary
1104 mb_obj_date = ms_obj_date summary
1105 obj_fn = ml_obj_file (ms_location summary)
1106 hs_date = ms_hs_date summary
1108 is_stable_obj = this_mod_name `elem` stable_obj
1109 is_stable_bco = this_mod_name `elem` stable_bco
1111 old_hmi = lookupUFM old_hpt this_mod_name
1113 -- We're using the dflags for this module now, obtained by
1114 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1115 dflags = ms_hspp_opts summary
1116 prevailing_target = hscTarget (hsc_dflags hsc_env)
1117 local_target = hscTarget dflags
1119 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1120 -- we don't do anything dodgy: these should only work to change
1121 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1122 -- end up trying to link object code to byte code.
1123 target = if prevailing_target /= local_target
1124 && (not (isObjectTarget prevailing_target)
1125 || not (isObjectTarget local_target))
1126 then prevailing_target
1129 -- store the corrected hscTarget into the summary
1130 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1132 -- The old interface is ok if
1133 -- a) we're compiling a source file, and the old HPT
1134 -- entry is for a source file
1135 -- b) we're compiling a hs-boot file
1136 -- Case (b) allows an hs-boot file to get the interface of its
1137 -- real source file on the second iteration of the compilation
1138 -- manager, but that does no harm. Otherwise the hs-boot file
1139 -- will always be recompiled
1144 Just hm_info | isBootSummary summary -> Just iface
1145 | not (mi_boot iface) -> Just iface
1146 | otherwise -> Nothing
1148 iface = hm_iface hm_info
1150 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1151 compile_it = upsweep_compile hsc_env old_hpt this_mod_name
1152 summary' mod_index nmods mb_old_iface
1154 compile_it_discard_iface
1155 = upsweep_compile hsc_env old_hpt this_mod_name
1156 summary' mod_index nmods Nothing
1162 -- Regardless of whether we're generating object code or
1163 -- byte code, we can always use an existing object file
1164 -- if it is *stable* (see checkStability).
1165 | is_stable_obj, isJust old_hmi ->
1167 -- object is stable, and we have an entry in the
1168 -- old HPT: nothing to do
1170 | is_stable_obj, isNothing old_hmi -> do
1171 linkable <- findObjectLinkable this_mod obj_fn
1172 (expectJust "upseep1" mb_obj_date)
1173 compile_it (Just linkable)
1174 -- object is stable, but we need to load the interface
1175 -- off disk to make a HMI.
1179 ASSERT(isJust old_hmi) -- must be in the old_hpt
1181 -- BCO is stable: nothing to do
1183 | Just hmi <- old_hmi,
1184 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1185 linkableTime l >= ms_hs_date summary ->
1187 -- we have an old BCO that is up to date with respect
1188 -- to the source: do a recompilation check as normal.
1192 -- no existing code at all: we must recompile.
1194 -- When generating object code, if there's an up-to-date
1195 -- object file on the disk, then we can use it.
1196 -- However, if the object file is new (compared to any
1197 -- linkable we had from a previous compilation), then we
1198 -- must discard any in-memory interface, because this
1199 -- means the user has compiled the source file
1200 -- separately and generated a new interface, that we must
1201 -- read from the disk.
1203 obj | isObjectTarget obj,
1204 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1207 | Just l <- hm_linkable hmi,
1208 isObjectLinkable l && linkableTime l == obj_date
1209 -> compile_it (Just l)
1211 linkable <- findObjectLinkable this_mod obj_fn obj_date
1212 compile_it_discard_iface (Just linkable)
1218 -- Run hsc to compile a module
1219 upsweep_compile hsc_env old_hpt this_mod summary
1224 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
1228 -- Compilation failed. Compile may still have updated the PCS, tho.
1229 CompErrs -> return Nothing
1231 -- Compilation "succeeded", and may or may not have returned a new
1232 -- linkable (depending on whether compilation was actually performed
1234 CompOK new_details new_iface new_linkable
1235 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1236 hm_details = new_details,
1237 hm_linkable = new_linkable }
1238 return (Just new_info)
1241 -- Filter modules in the HPT
1242 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1243 retainInTopLevelEnvs keep_these hpt
1244 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1246 , let mb_mod_info = lookupUFM hpt mod
1247 , isJust mb_mod_info ]
1249 -- ---------------------------------------------------------------------------
1250 -- Topological sort of the module graph
1253 :: Bool -- Drop hi-boot nodes? (see below)
1257 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1258 -- The resulting list of strongly-connected-components is in topologically
1259 -- sorted order, starting with the module(s) at the bottom of the
1260 -- dependency graph (ie compile them first) and ending with the ones at
1263 -- Drop hi-boot nodes (first boolean arg)?
1265 -- False: treat the hi-boot summaries as nodes of the graph,
1266 -- so the graph must be acyclic
1268 -- True: eliminate the hi-boot nodes, and instead pretend
1269 -- the a source-import of Foo is an import of Foo
1270 -- The resulting graph has no hi-boot nodes, but can by cyclic
1272 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1273 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1274 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1275 = stronglyConnComp (map vertex_fn (reachable graph root))
1277 -- restrict the graph to just those modules reachable from
1278 -- the specified module. We do this by building a graph with
1279 -- the full set of nodes, and determining the reachable set from
1280 -- the specified node.
1281 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1282 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1284 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1285 | otherwise = throwDyn (ProgramError "module does not exist")
1287 moduleGraphNodes :: Bool -> [ModSummary]
1288 -> ([(ModSummary, Int, [Int])], HscSource -> ModuleName -> Maybe Int)
1289 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1291 -- Drop hs-boot nodes by using HsSrcFile as the key
1292 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1293 | otherwise = HsBootFile
1295 -- We use integers as the keys for the SCC algorithm
1296 nodes :: [(ModSummary, Int, [Int])]
1297 nodes = [(s, expectJust "topSort" $
1298 lookup_key (ms_hsc_src s) (ms_mod_name s),
1299 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1300 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1301 (-- see [boot-edges] below
1302 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1304 else case lookup_key HsBootFile (ms_mod_name s) of
1309 , not (isBootSummary s && drop_hs_boot_nodes) ]
1310 -- Drop the hi-boot ones if told to do so
1312 -- [boot-edges] if this is a .hs and there is an equivalent
1313 -- .hs-boot, add a link from the former to the latter. This
1314 -- has the effect of detecting bogus cases where the .hs-boot
1315 -- depends on the .hs, by introducing a cycle. Additionally,
1316 -- it ensures that we will always process the .hs-boot before
1317 -- the .hs, and so the HomePackageTable will always have the
1318 -- most up to date information.
1320 key_map :: NodeMap Int
1321 key_map = listToFM ([(moduleName (ms_mod s), ms_hsc_src s)
1325 lookup_key :: HscSource -> ModuleName -> Maybe Int
1326 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1328 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1329 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1330 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1331 -- the IsBootInterface parameter True; else False
1334 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1335 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1337 msKey :: ModSummary -> NodeKey
1338 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1340 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1341 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1343 nodeMapElts :: NodeMap a -> [a]
1344 nodeMapElts = eltsFM
1346 ms_mod_name :: ModSummary -> ModuleName
1347 ms_mod_name = moduleName . ms_mod
1349 -- If there are {-# SOURCE #-} imports between strongly connected
1350 -- components in the topological sort, then those imports can
1351 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1352 -- were necessary, then the edge would be part of a cycle.
1353 warnUnnecessarySourceImports :: DynFlags -> [SCC ModSummary] -> IO ()
1354 warnUnnecessarySourceImports dflags sccs =
1355 printBagOfWarnings dflags (listToBag (concat (map (check.flattenSCC) sccs)))
1357 let mods_in_this_cycle = map ms_mod_name ms in
1358 [ warn m i | m <- ms, i <- ms_srcimps m,
1359 unLoc i `notElem` mods_in_this_cycle ]
1361 warn :: ModSummary -> Located ModuleName -> WarnMsg
1362 warn ms (L loc mod) =
1364 (ptext SLIT("Warning: {-# SOURCE #-} unnecessary in import of ")
1365 <+> quotes (ppr mod))
1367 -----------------------------------------------------------------------------
1368 -- Downsweep (dependency analysis)
1370 -- Chase downwards from the specified root set, returning summaries
1371 -- for all home modules encountered. Only follow source-import
1374 -- We pass in the previous collection of summaries, which is used as a
1375 -- cache to avoid recalculating a module summary if the source is
1378 -- The returned list of [ModSummary] nodes has one node for each home-package
1379 -- module, plus one for any hs-boot files. The imports of these nodes
1380 -- are all there, including the imports of non-home-package modules.
1383 -> [ModSummary] -- Old summaries
1384 -> [ModuleName] -- Ignore dependencies on these; treat
1385 -- them as if they were package modules
1386 -> Bool -- True <=> allow multiple targets to have
1387 -- the same module name; this is
1388 -- very useful for ghc -M
1389 -> IO (Maybe [ModSummary])
1390 -- The elts of [ModSummary] all have distinct
1391 -- (Modules, IsBoot) identifiers, unless the Bool is true
1392 -- in which case there can be repeats
1393 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1394 = -- catch error messages and return them
1395 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1396 rootSummaries <- mapM getRootSummary roots
1397 let root_map = mkRootMap rootSummaries
1398 checkDuplicates root_map
1399 summs <- loop (concatMap msDeps rootSummaries) root_map
1402 roots = hsc_targets hsc_env
1404 old_summary_map :: NodeMap ModSummary
1405 old_summary_map = mkNodeMap old_summaries
1407 getRootSummary :: Target -> IO ModSummary
1408 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1409 = do exists <- doesFileExist file
1411 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1412 else throwDyn $ mkPlainErrMsg noSrcSpan $
1413 text "can't find file:" <+> text file
1414 getRootSummary (Target (TargetModule modl) maybe_buf)
1415 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1416 (L rootLoc modl) maybe_buf excl_mods
1417 case maybe_summary of
1418 Nothing -> packageModErr modl
1421 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1423 -- In a root module, the filename is allowed to diverge from the module
1424 -- name, so we have to check that there aren't multiple root files
1425 -- defining the same module (otherwise the duplicates will be silently
1426 -- ignored, leading to confusing behaviour).
1427 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1428 checkDuplicates root_map
1429 | allow_dup_roots = return ()
1430 | null dup_roots = return ()
1431 | otherwise = multiRootsErr (head dup_roots)
1433 dup_roots :: [[ModSummary]] -- Each at least of length 2
1434 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1436 loop :: [(Located ModuleName,IsBootInterface)]
1437 -- Work list: process these modules
1438 -> NodeMap [ModSummary]
1439 -- Visited set; the range is a list because
1440 -- the roots can have the same module names
1441 -- if allow_dup_roots is True
1443 -- The result includes the worklist, except
1444 -- for those mentioned in the visited set
1445 loop [] done = return (concat (nodeMapElts done))
1446 loop ((wanted_mod, is_boot) : ss) done
1447 | Just summs <- lookupFM done key
1448 = if isSingleton summs then
1451 do { multiRootsErr summs; return [] }
1452 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1453 is_boot wanted_mod Nothing excl_mods
1455 Nothing -> loop ss done
1456 Just s -> loop (msDeps s ++ ss)
1457 (addToFM done key [s]) }
1459 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1461 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1462 mkRootMap summaries = addListToFM_C (++) emptyFM
1463 [ (msKey s, [s]) | s <- summaries ]
1465 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1466 -- (msDeps s) returns the dependencies of the ModSummary s.
1467 -- A wrinkle is that for a {-# SOURCE #-} import we return
1468 -- *both* the hs-boot file
1469 -- *and* the source file
1470 -- as "dependencies". That ensures that the list of all relevant
1471 -- modules always contains B.hs if it contains B.hs-boot.
1472 -- Remember, this pass isn't doing the topological sort. It's
1473 -- just gathering the list of all relevant ModSummaries
1475 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1476 ++ [ (m,False) | m <- ms_imps s ]
1478 -----------------------------------------------------------------------------
1479 -- Summarising modules
1481 -- We have two types of summarisation:
1483 -- * Summarise a file. This is used for the root module(s) passed to
1484 -- cmLoadModules. The file is read, and used to determine the root
1485 -- module name. The module name may differ from the filename.
1487 -- * Summarise a module. We are given a module name, and must provide
1488 -- a summary. The finder is used to locate the file in which the module
1493 -> [ModSummary] -- old summaries
1494 -> FilePath -- source file name
1495 -> Maybe Phase -- start phase
1496 -> Maybe (StringBuffer,ClockTime)
1499 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1500 -- we can use a cached summary if one is available and the
1501 -- source file hasn't changed, But we have to look up the summary
1502 -- by source file, rather than module name as we do in summarise.
1503 | Just old_summary <- findSummaryBySourceFile old_summaries file
1505 let location = ms_location old_summary
1507 -- return the cached summary if the source didn't change
1508 src_timestamp <- case maybe_buf of
1509 Just (_,t) -> return t
1510 Nothing -> getModificationTime file
1511 -- The file exists; we checked in getRootSummary above.
1512 -- If it gets removed subsequently, then this
1513 -- getModificationTime may fail, but that's the right
1516 if ms_hs_date old_summary == src_timestamp
1517 then do -- update the object-file timestamp
1518 obj_timestamp <- getObjTimestamp location False
1519 return old_summary{ ms_obj_date = obj_timestamp }
1527 let dflags = hsc_dflags hsc_env
1529 (dflags', hspp_fn, buf)
1530 <- preprocessFile dflags file mb_phase maybe_buf
1532 (srcimps,the_imps, L _ mod_name) <- getImports dflags' buf hspp_fn
1534 -- Make a ModLocation for this file
1535 location <- mkHomeModLocation dflags mod_name file
1537 -- Tell the Finder cache where it is, so that subsequent calls
1538 -- to findModule will find it, even if it's not on any search path
1539 mod <- addHomeModuleToFinder hsc_env mod_name location
1541 src_timestamp <- case maybe_buf of
1542 Just (_,t) -> return t
1543 Nothing -> getModificationTime file
1544 -- getMofificationTime may fail
1546 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1548 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1549 ms_location = location,
1550 ms_hspp_file = hspp_fn,
1551 ms_hspp_opts = dflags',
1552 ms_hspp_buf = Just buf,
1553 ms_srcimps = srcimps, ms_imps = the_imps,
1554 ms_hs_date = src_timestamp,
1555 ms_obj_date = obj_timestamp })
1557 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1558 findSummaryBySourceFile summaries file
1559 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1560 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
1564 -- Summarise a module, and pick up source and timestamp.
1567 -> NodeMap ModSummary -- Map of old summaries
1568 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1569 -> Located ModuleName -- Imported module to be summarised
1570 -> Maybe (StringBuffer, ClockTime)
1571 -> [ModuleName] -- Modules to exclude
1572 -> IO (Maybe ModSummary) -- Its new summary
1574 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1575 | wanted_mod `elem` excl_mods
1578 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1579 = do -- Find its new timestamp; all the
1580 -- ModSummaries in the old map have valid ml_hs_files
1581 let location = ms_location old_summary
1582 src_fn = expectJust "summariseModule" (ml_hs_file location)
1584 -- check the modification time on the source file, and
1585 -- return the cached summary if it hasn't changed. If the
1586 -- file has disappeared, we need to call the Finder again.
1588 Just (_,t) -> check_timestamp old_summary location src_fn t
1590 m <- System.IO.Error.try (getModificationTime src_fn)
1592 Right t -> check_timestamp old_summary location src_fn t
1593 Left e | isDoesNotExistError e -> find_it
1594 | otherwise -> ioError e
1596 | otherwise = find_it
1598 dflags = hsc_dflags hsc_env
1600 hsc_src = if is_boot then HsBootFile else HsSrcFile
1602 check_timestamp old_summary location src_fn src_timestamp
1603 | ms_hs_date old_summary == src_timestamp = do
1604 -- update the object-file timestamp
1605 obj_timestamp <- getObjTimestamp location is_boot
1606 return (Just old_summary{ ms_obj_date = obj_timestamp })
1608 -- source changed: re-summarise.
1609 new_summary location (ms_mod old_summary) src_fn src_timestamp
1612 -- Don't use the Finder's cache this time. If the module was
1613 -- previously a package module, it may have now appeared on the
1614 -- search path, so we want to consider it to be a home module. If
1615 -- the module was previously a home module, it may have moved.
1616 uncacheModule hsc_env wanted_mod
1617 found <- findImportedModule hsc_env wanted_mod Nothing
1620 | isJust (ml_hs_file location) ->
1622 just_found location mod
1624 -- Drop external-pkg
1625 ASSERT(modulePackageId mod /= thisPackage dflags)
1629 err -> noModError dflags loc wanted_mod err
1632 just_found location mod = do
1633 -- Adjust location to point to the hs-boot source file,
1634 -- hi file, object file, when is_boot says so
1635 let location' | is_boot = addBootSuffixLocn location
1636 | otherwise = location
1637 src_fn = expectJust "summarise2" (ml_hs_file location')
1639 -- Check that it exists
1640 -- It might have been deleted since the Finder last found it
1641 maybe_t <- modificationTimeIfExists src_fn
1643 Nothing -> noHsFileErr loc src_fn
1644 Just t -> new_summary location' mod src_fn t
1647 new_summary location mod src_fn src_timestamp
1649 -- Preprocess the source file and get its imports
1650 -- The dflags' contains the OPTIONS pragmas
1651 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1652 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1654 when (mod_name /= wanted_mod) $
1655 throwDyn $ mkPlainErrMsg mod_loc $
1656 text "file name does not match module name"
1657 <+> quotes (ppr mod_name)
1659 -- Find the object timestamp, and return the summary
1660 obj_timestamp <- getObjTimestamp location is_boot
1662 return (Just ( ModSummary { ms_mod = mod,
1663 ms_hsc_src = hsc_src,
1664 ms_location = location,
1665 ms_hspp_file = hspp_fn,
1666 ms_hspp_opts = dflags',
1667 ms_hspp_buf = Just buf,
1668 ms_srcimps = srcimps,
1670 ms_hs_date = src_timestamp,
1671 ms_obj_date = obj_timestamp }))
1674 getObjTimestamp location is_boot
1675 = if is_boot then return Nothing
1676 else modificationTimeIfExists (ml_obj_file location)
1679 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1680 -> IO (DynFlags, FilePath, StringBuffer)
1681 preprocessFile dflags src_fn mb_phase Nothing
1683 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1684 buf <- hGetStringBuffer hspp_fn
1685 return (dflags', hspp_fn, buf)
1687 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1689 -- case we bypass the preprocessing stage?
1691 local_opts = getOptions buf src_fn
1693 (dflags', errs) <- parseDynamicFlags dflags (map unLoc local_opts)
1697 | Just (Unlit _) <- mb_phase = True
1698 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1699 -- note: local_opts is only required if there's no Unlit phase
1700 | dopt Opt_Cpp dflags' = True
1701 | dopt Opt_Pp dflags' = True
1704 when needs_preprocessing $
1705 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1707 return (dflags', src_fn, buf)
1710 -----------------------------------------------------------------------------
1712 -----------------------------------------------------------------------------
1714 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
1715 -- ToDo: we don't have a proper line number for this error
1716 noModError dflags loc wanted_mod err
1717 = throwDyn $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
1719 noHsFileErr loc path
1720 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1723 = throwDyn $ mkPlainErrMsg noSrcSpan $
1724 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1726 multiRootsErr :: [ModSummary] -> IO ()
1727 multiRootsErr summs@(summ1:_)
1728 = throwDyn $ mkPlainErrMsg noSrcSpan $
1729 text "module" <+> quotes (ppr mod) <+>
1730 text "is defined in multiple files:" <+>
1731 sep (map text files)
1734 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1736 cyclicModuleErr :: [ModSummary] -> SDoc
1738 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1739 2 (vcat (map show_one ms))
1741 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1742 nest 2 $ ptext SLIT("imports:") <+>
1743 (pp_imps HsBootFile (ms_srcimps ms)
1744 $$ pp_imps HsSrcFile (ms_imps ms))]
1745 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1746 pp_imps src mods = fsep (map (show_mod src) mods)
1749 -- | Inform GHC that the working directory has changed. GHC will flush
1750 -- its cache of module locations, since it may no longer be valid.
1751 -- Note: if you change the working directory, you should also unload
1752 -- the current program (set targets to empty, followed by load).
1753 workingDirectoryChanged :: Session -> IO ()
1754 workingDirectoryChanged s = withSession s $ flushFinderCaches
1756 -- -----------------------------------------------------------------------------
1757 -- inspecting the session
1759 -- | Get the module dependency graph.
1760 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1761 getModuleGraph s = withSession s (return . hsc_mod_graph)
1763 isLoaded :: Session -> ModuleName -> IO Bool
1764 isLoaded s m = withSession s $ \hsc_env ->
1765 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
1767 getBindings :: Session -> IO [TyThing]
1768 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1770 getPrintUnqual :: Session -> IO PrintUnqualified
1771 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1773 -- | Container for information about a 'Module'.
1774 data ModuleInfo = ModuleInfo {
1775 minf_type_env :: TypeEnv,
1776 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
1777 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1778 minf_instances :: [Instance]
1780 ,minf_modBreaks :: ModBreaks
1782 -- ToDo: this should really contain the ModIface too
1784 -- We don't want HomeModInfo here, because a ModuleInfo applies
1785 -- to package modules too.
1787 -- | Request information about a loaded 'Module'
1788 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1789 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1790 let mg = hsc_mod_graph hsc_env
1791 if mdl `elem` map ms_mod mg
1792 then getHomeModuleInfo hsc_env (moduleName mdl)
1794 {- if isHomeModule (hsc_dflags hsc_env) mdl
1796 else -} getPackageModuleInfo hsc_env mdl
1797 -- getPackageModuleInfo will attempt to find the interface, so
1798 -- we don't want to call it for a home module, just in case there
1799 -- was a problem loading the module and the interface doesn't
1800 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1802 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1803 getPackageModuleInfo hsc_env mdl = do
1805 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
1807 Nothing -> return Nothing
1809 eps <- readIORef (hsc_EPS hsc_env)
1811 names = availsToNameSet avails
1813 tys = [ ty | name <- concatMap availNames avails,
1814 Just ty <- [lookupTypeEnv pte name] ]
1816 return (Just (ModuleInfo {
1817 minf_type_env = mkTypeEnv tys,
1818 minf_exports = names,
1819 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
1820 minf_instances = error "getModuleInfo: instances for package module unimplemented",
1821 minf_modBreaks = emptyModBreaks
1824 -- bogusly different for non-GHCI (ToDo)
1828 getHomeModuleInfo hsc_env mdl =
1829 case lookupUFM (hsc_HPT hsc_env) mdl of
1830 Nothing -> return Nothing
1832 let details = hm_details hmi
1833 return (Just (ModuleInfo {
1834 minf_type_env = md_types details,
1835 minf_exports = availsToNameSet (md_exports details),
1836 minf_rdr_env = mi_globals $! hm_iface hmi,
1837 minf_instances = md_insts details
1839 ,minf_modBreaks = md_modBreaks details
1843 -- | The list of top-level entities defined in a module
1844 modInfoTyThings :: ModuleInfo -> [TyThing]
1845 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1847 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1848 modInfoTopLevelScope minf
1849 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1851 modInfoExports :: ModuleInfo -> [Name]
1852 modInfoExports minf = nameSetToList $! minf_exports minf
1854 -- | Returns the instances defined by the specified module.
1855 -- Warning: currently unimplemented for package modules.
1856 modInfoInstances :: ModuleInfo -> [Instance]
1857 modInfoInstances = minf_instances
1859 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1860 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1862 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1863 modInfoPrintUnqualified minf = fmap mkPrintUnqualified (minf_rdr_env minf)
1865 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1866 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1867 case lookupTypeEnv (minf_type_env minf) name of
1868 Just tyThing -> return (Just tyThing)
1870 eps <- readIORef (hsc_EPS hsc_env)
1871 return $! lookupType (hsc_dflags hsc_env)
1872 (hsc_HPT hsc_env) (eps_PTE eps) name
1875 modInfoModBreaks = minf_modBreaks
1878 isDictonaryId :: Id -> Bool
1880 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1882 -- | Looks up a global name: that is, any top-level name in any
1883 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1884 -- the interactive context, and therefore does not require a preceding
1886 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1887 lookupGlobalName s name = withSession s $ \hsc_env -> do
1888 eps <- readIORef (hsc_EPS hsc_env)
1889 return $! lookupType (hsc_dflags hsc_env)
1890 (hsc_HPT hsc_env) (eps_PTE eps) name
1892 -- -----------------------------------------------------------------------------
1893 -- Misc exported utils
1895 dataConType :: DataCon -> Type
1896 dataConType dc = idType (dataConWrapId dc)
1898 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1899 pprParenSymName :: NamedThing a => a -> SDoc
1900 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1902 -- ----------------------------------------------------------------------------
1907 -- - Data and Typeable instances for HsSyn.
1909 -- ToDo: check for small transformations that happen to the syntax in
1910 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1912 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1913 -- to get from TyCons, Ids etc. to TH syntax (reify).
1915 -- :browse will use either lm_toplev or inspect lm_interface, depending
1916 -- on whether the module is interpreted or not.
1918 -- This is for reconstructing refactored source code
1919 -- Calls the lexer repeatedly.
1920 -- ToDo: add comment tokens to token stream
1921 getTokenStream :: Session -> Module -> IO [Located Token]
1924 -- -----------------------------------------------------------------------------
1925 -- Interactive evaluation
1927 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
1928 -- filesystem and package database to find the corresponding 'Module',
1929 -- using the algorithm that is used for an @import@ declaration.
1930 findModule :: Session -> ModuleName -> Maybe PackageId -> IO Module
1931 findModule s mod_name maybe_pkg = withSession s $ \hsc_env ->
1932 findModule' hsc_env mod_name maybe_pkg
1934 findModule' hsc_env mod_name maybe_pkg =
1936 dflags = hsc_dflags hsc_env
1937 hpt = hsc_HPT hsc_env
1938 this_pkg = thisPackage dflags
1940 case lookupUFM hpt mod_name of
1941 Just mod_info -> return (mi_module (hm_iface mod_info))
1942 _not_a_home_module -> do
1943 res <- findImportedModule hsc_env mod_name maybe_pkg
1945 Found _ m | modulePackageId m /= this_pkg -> return m
1946 | otherwise -> throwDyn (CmdLineError (showSDoc $
1947 text "module" <+> pprModule m <+>
1948 text "is not loaded"))
1949 err -> let msg = cannotFindModule dflags mod_name err in
1950 throwDyn (CmdLineError (showSDoc msg))
1954 -- | Set the interactive evaluation context.
1956 -- Setting the context doesn't throw away any bindings; the bindings
1957 -- we've built up in the InteractiveContext simply move to the new
1958 -- module. They always shadow anything in scope in the current context.
1959 setContext :: Session
1960 -> [Module] -- entire top level scope of these modules
1961 -> [Module] -- exports only of these modules
1963 setContext sess@(Session ref) toplev_mods export_mods = do
1964 hsc_env <- readIORef ref
1965 let old_ic = hsc_IC hsc_env
1966 hpt = hsc_HPT hsc_env
1968 export_env <- mkExportEnv hsc_env export_mods
1969 toplev_envs <- mapM (mkTopLevEnv hpt) toplev_mods
1970 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1971 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplev_mods,
1972 ic_exports = export_mods,
1973 ic_rn_gbl_env = all_env }}
1975 -- Make a GlobalRdrEnv based on the exports of the modules only.
1976 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1977 mkExportEnv hsc_env mods = do
1978 stuff <- mapM (getModuleExports hsc_env) mods
1980 (_msgs, mb_name_sets) = unzip stuff
1981 gres = [ nameSetToGlobalRdrEnv (availsToNameSet avails) (moduleName mod)
1982 | (Just avails, mod) <- zip mb_name_sets mods ]
1984 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1986 nameSetToGlobalRdrEnv :: NameSet -> ModuleName -> GlobalRdrEnv
1987 nameSetToGlobalRdrEnv names mod =
1988 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1989 | name <- nameSetToList names ]
1991 vanillaProv :: ModuleName -> Provenance
1992 -- We're building a GlobalRdrEnv as if the user imported
1993 -- all the specified modules into the global interactive module
1994 vanillaProv mod_name = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1996 decl = ImpDeclSpec { is_mod = mod_name, is_as = mod_name,
1998 is_dloc = srcLocSpan interactiveSrcLoc }
2000 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
2001 mkTopLevEnv hpt modl
2002 = case lookupUFM hpt (moduleName modl) of
2003 Nothing -> throwDyn (ProgramError ("mkTopLevEnv: not a home module " ++
2004 showSDoc (ppr modl)))
2006 case mi_globals (hm_iface details) of
2008 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
2009 ++ showSDoc (ppr modl)))
2010 Just env -> return env
2012 -- | Get the interactive evaluation context, consisting of a pair of the
2013 -- set of modules from which we take the full top-level scope, and the set
2014 -- of modules from which we take just the exports respectively.
2015 getContext :: Session -> IO ([Module],[Module])
2016 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
2017 return (ic_toplev_scope ic, ic_exports ic))
2019 -- | Returns 'True' if the specified module is interpreted, and hence has
2020 -- its full top-level scope available.
2021 moduleIsInterpreted :: Session -> Module -> IO Bool
2022 moduleIsInterpreted s modl = withSession s $ \h ->
2023 if modulePackageId modl /= thisPackage (hsc_dflags h)
2025 else case lookupUFM (hsc_HPT h) (moduleName modl) of
2026 Just details -> return (isJust (mi_globals (hm_iface details)))
2027 _not_a_home_module -> return False
2029 -- | Looks up an identifier in the current interactive context (for :info)
2030 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
2031 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
2033 -- | Returns all names in scope in the current interactive context
2034 getNamesInScope :: Session -> IO [Name]
2035 getNamesInScope s = withSession s $ \hsc_env -> do
2036 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
2038 getRdrNamesInScope :: Session -> IO [RdrName]
2039 getRdrNamesInScope s = withSession s $ \hsc_env -> do
2040 let env = ic_rn_gbl_env (hsc_IC hsc_env)
2041 return (concat (map greToRdrNames (globalRdrEnvElts env)))
2043 -- ToDo: move to RdrName
2044 greToRdrNames :: GlobalRdrElt -> [RdrName]
2045 greToRdrNames GRE{ gre_name = name, gre_prov = prov }
2047 LocalDef -> [unqual]
2048 Imported specs -> concat (map do_spec (map is_decl specs))
2050 occ = nameOccName name
2053 | is_qual decl_spec = [qual]
2054 | otherwise = [unqual,qual]
2055 where qual = Qual (is_as decl_spec) occ
2057 -- | Parses a string as an identifier, and returns the list of 'Name's that
2058 -- the identifier can refer to in the current interactive context.
2059 parseName :: Session -> String -> IO [Name]
2060 parseName s str = withSession s $ \hsc_env -> do
2061 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
2062 case maybe_rdr_name of
2063 Nothing -> return []
2064 Just (L _ rdr_name) -> do
2065 mb_names <- tcRnLookupRdrName hsc_env rdr_name
2067 Nothing -> return []
2068 Just ns -> return ns
2069 -- ToDo: should return error messages
2071 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
2072 -- entity known to GHC, including 'Name's defined using 'runStmt'.
2073 lookupName :: Session -> Name -> IO (Maybe TyThing)
2074 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
2076 -- -----------------------------------------------------------------------------
2077 -- Getting the type of an expression
2079 -- | Get the type of an expression
2080 exprType :: Session -> String -> IO (Maybe Type)
2081 exprType s expr = withSession s $ \hsc_env -> do
2082 maybe_stuff <- hscTcExpr hsc_env expr
2084 Nothing -> return Nothing
2085 Just ty -> return (Just tidy_ty)
2087 tidy_ty = tidyType emptyTidyEnv ty
2089 -- -----------------------------------------------------------------------------
2090 -- Getting the kind of a type
2092 -- | Get the kind of a type
2093 typeKind :: Session -> String -> IO (Maybe Kind)
2094 typeKind s str = withSession s $ \hsc_env -> do
2095 maybe_stuff <- hscKcType hsc_env str
2097 Nothing -> return Nothing
2098 Just kind -> return (Just kind)
2100 -----------------------------------------------------------------------------
2101 -- cmCompileExpr: compile an expression and deliver an HValue
2103 compileExpr :: Session -> String -> IO (Maybe HValue)
2104 compileExpr s expr = withSession s $ \hsc_env -> do
2105 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
2107 Nothing -> return Nothing
2108 Just (new_ic, names, hval) -> do
2110 hvals <- (unsafeCoerce# hval) :: IO [HValue]
2112 case (names,hvals) of
2113 ([n],[hv]) -> return (Just hv)
2114 _ -> panic "compileExpr"
2116 -- -----------------------------------------------------------------------------
2117 -- Compile an expression into a dynamic
2119 dynCompileExpr :: Session -> String -> IO (Maybe Dynamic)
2120 dynCompileExpr ses expr = do
2121 (full,exports) <- getContext ses
2122 setContext ses full $
2124 (stringToPackageId "base") (mkModuleName "Data.Dynamic")
2126 let stmt = "let __dynCompileExpr = Data.Dynamic.toDyn (" ++ expr ++ ")"
2127 res <- withSession ses (flip hscStmt stmt)
2128 setContext ses full exports
2130 Nothing -> return Nothing
2131 Just (_, names, hvals) -> do
2132 vals <- (unsafeCoerce# hvals :: IO [Dynamic])
2133 case (names,vals) of
2134 (_:[], v:[]) -> return (Just v)
2135 _ -> panic "dynCompileExpr"
2137 -- -----------------------------------------------------------------------------
2138 -- running a statement interactively
2141 = RunOk [Name] -- ^ names bound by this evaluation
2142 | RunFailed -- ^ statement failed compilation
2143 | RunException Exception -- ^ statement raised an exception
2144 | RunBreak ThreadId [Name] BreakInfo ResumeHandle
2147 = Break HValue BreakInfo ThreadId
2148 -- ^ the computation hit a breakpoint
2149 | Complete (Either Exception [HValue])
2150 -- ^ the computation completed with either an exception or a value
2152 -- | This is a token given back to the client when runStmt stops at a
2153 -- breakpoint. It allows the original computation to be resumed, restoring
2154 -- the old interactive context.
2157 (MVar ()) -- breakMVar
2158 (MVar Status) -- statusMVar
2159 [Name] -- [Name] to bind on completion
2160 InteractiveContext -- IC on completion
2161 InteractiveContext -- IC to restore on resumption
2162 [Name] -- [Name] to remove from the link env
2164 -- We need to track two InteractiveContexts:
2165 -- - the IC before runStmt, which is restored on each resume
2166 -- - the IC binding the results of the original statement, which
2167 -- will be the IC when runStmt returns with RunOk.
2169 -- | Run a statement in the current interactive context. Statement
2170 -- may bind multple values.
2171 runStmt :: Session -> String -> IO RunResult
2172 runStmt (Session ref) expr
2174 hsc_env <- readIORef ref
2176 breakMVar <- newEmptyMVar -- wait on this when we hit a breakpoint
2177 statusMVar <- newEmptyMVar -- wait on this when a computation is running
2179 -- Turn off -fwarn-unused-bindings when running a statement, to hide
2180 -- warnings about the implicit bindings we introduce.
2181 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
2182 hsc_env' = hsc_env{ hsc_dflags = dflags' }
2184 maybe_stuff <- hscStmt hsc_env' expr
2187 Nothing -> return RunFailed
2188 Just (new_IC, names, hval) -> do
2190 -- set the onBreakAction to be performed when we hit a
2191 -- breakpoint this is visible in the Byte Code
2192 -- Interpreter, thus it is a global variable,
2193 -- implemented with stable pointers
2194 stablePtr <- setBreakAction breakMVar statusMVar
2196 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
2197 status <- sandboxIO statusMVar thing_to_run
2198 freeStablePtr stablePtr -- be careful not to leak stable pointers!
2199 handleRunStatus ref new_IC names (hsc_IC hsc_env)
2200 breakMVar statusMVar status
2202 handleRunStatus ref final_ic final_names resume_ic breakMVar statusMVar status =
2204 -- did we hit a breakpoint or did we complete?
2205 (Break apStack info tid) -> do
2206 hsc_env <- readIORef ref
2207 mod_info <- getHomeModuleInfo hsc_env (moduleName (breakInfo_module info))
2208 let breaks = minf_modBreaks (expectJust "handlRunStatus" mod_info)
2209 let index = breakInfo_number info
2210 occs = modBreaks_vars breaks ! index
2211 span = modBreaks_locs breaks ! index
2212 (new_hsc_env, names) <- extendEnvironment hsc_env apStack span
2213 (breakInfo_vars info)
2214 (breakInfo_resty info) occs
2215 writeIORef ref new_hsc_env
2216 let res = ResumeHandle breakMVar statusMVar final_names
2217 final_ic resume_ic names
2218 return (RunBreak tid names info res)
2219 (Complete either_hvals) ->
2220 case either_hvals of
2221 Left e -> return (RunException e)
2223 hsc_env <- readIORef ref
2224 writeIORef ref hsc_env{hsc_IC=final_ic}
2225 Linker.extendLinkEnv (zip final_names hvals)
2226 return (RunOk final_names)
2228 -- this points to the IO action that is executed when a breakpoint is hit
2229 foreign import ccall "&breakPointIOAction"
2230 breakPointIOAction :: Ptr (StablePtr (BreakInfo -> HValue -> IO ()))
2232 -- When running a computation, we redirect ^C exceptions to the running
2233 -- thread. ToDo: we might want a way to continue even if the target
2234 -- thread doesn't die when it receives the exception... "this thread
2235 -- is not responding".
2236 sandboxIO :: MVar Status -> IO [HValue] -> IO Status
2237 sandboxIO statusMVar thing = do
2238 ts <- takeMVar interruptTargetThread
2239 child <- forkIO (do res <- Exception.try thing; putMVar statusMVar (Complete res))
2240 putMVar interruptTargetThread (child:ts)
2241 takeMVar statusMVar `finally` modifyMVar_ interruptTargetThread (return.tail)
2243 setBreakAction breakMVar statusMVar = do
2244 stablePtr <- newStablePtr onBreak
2245 poke breakPointIOAction stablePtr
2247 where onBreak ids apStack = do
2249 putMVar statusMVar (Break apStack ids tid)
2252 resume :: Session -> ResumeHandle -> IO RunResult
2253 resume (Session ref) res@(ResumeHandle breakMVar statusMVar
2254 final_names final_ic resume_ic names)
2256 -- restore the original interactive context. This is not entirely
2257 -- satisfactory: any new bindings made since the breakpoint stopped
2258 -- will be dropped from the interactive context, but not from the
2259 -- linker's environment.
2260 hsc_env <- readIORef ref
2261 writeIORef ref hsc_env{ hsc_IC = resume_ic }
2262 Linker.deleteFromLinkEnv names
2264 stablePtr <- setBreakAction breakMVar statusMVar
2265 putMVar breakMVar () -- this awakens the stopped thread...
2266 status <- takeMVar statusMVar -- and wait for the result
2267 freeStablePtr stablePtr -- be careful not to leak stable pointers!
2268 handleRunStatus ref final_ic final_names resume_ic
2269 breakMVar statusMVar status
2272 -- This version of sandboxIO runs the expression in a completely new
2273 -- RTS main thread. It is disabled for now because ^C exceptions
2274 -- won't be delivered to the new thread, instead they'll be delivered
2275 -- to the (blocked) GHCi main thread.
2277 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
2279 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
2280 sandboxIO thing = do
2281 st_thing <- newStablePtr (Exception.try thing)
2282 alloca $ \ p_st_result -> do
2283 stat <- rts_evalStableIO st_thing p_st_result
2284 freeStablePtr st_thing
2286 then do st_result <- peek p_st_result
2287 result <- deRefStablePtr st_result
2288 freeStablePtr st_result
2289 return (Right result)
2291 return (Left (fromIntegral stat))
2293 foreign import "rts_evalStableIO" {- safe -}
2294 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
2295 -- more informative than the C type!
2297 XXX the type of rts_evalStableIO no longer matches the above
2301 -- -----------------------------------------------------------------------------
2302 -- After stopping at a breakpoint, add free variables to the environment
2304 -- Todo: turn this into a primop, and provide special version(s) for unboxed things
2305 foreign import ccall "rts_getApStackVal" getApStackVal :: StablePtr a -> Int -> IO (StablePtr b)
2307 getIdValFromApStack :: a -> (Id, Int) -> IO (Id, HValue)
2308 getIdValFromApStack apStack (identifier, stackDepth) = do
2309 -- ToDo: check the type of the identifer and decide whether it is unboxed or not
2310 apSptr <- newStablePtr apStack
2311 resultSptr <- getApStackVal apSptr (stackDepth - 1)
2312 result <- deRefStablePtr resultSptr
2313 freeStablePtr apSptr
2314 freeStablePtr resultSptr
2315 return (identifier, unsafeCoerce# result)
2319 -> a -- the AP_STACK object built by the interpreter
2321 -> [(Id, Int)] -- free variables and offsets into the AP_STACK
2323 -> [OccName] -- names for the variables (from the source code)
2324 -> IO (HscEnv, [Name])
2325 extendEnvironment hsc_env apStack span idsOffsets result_ty occs = do
2326 idsVals <- mapM (getIdValFromApStack apStack) idsOffsets
2327 let (ids, hValues) = unzip idsVals
2328 new_ids <- zipWithM mkNewId occs ids
2329 let names = map idName ids
2331 -- make an Id for _result. We use the Unique of the FastString "_result";
2332 -- we don't care about uniqueness here, because there will only be one
2333 -- _result in scope at any time.
2334 let result_fs = FSLIT("_result")
2335 result_name = mkInternalName (getUnique result_fs)
2336 (mkVarOccFS result_fs) (srcSpanStart span)
2337 result_id = Id.mkLocalId result_name result_ty
2339 -- for each Id we're about to bind in the local envt:
2340 -- - skolemise the type variables in its type, so they can't
2341 -- be randomly unified with other types. These type variables
2342 -- can only be resolved by type reconstruction in RtClosureInspect
2343 -- - tidy the type variables
2344 -- - globalise the Id (Ids are supposed to be Global, apparently).
2346 let all_ids = result_id : ids
2347 (id_tys, tyvarss) = mapAndUnzip (skolemiseTy.idType) all_ids
2348 (_,tidy_tys) = tidyOpenTypes emptyTidyEnv id_tys
2349 new_tyvars = unionVarSets tyvarss
2350 new_ids = zipWith setIdType all_ids tidy_tys
2351 global_ids = map (globaliseId VanillaGlobal) new_ids
2353 let ictxt = extendInteractiveContext (hsc_IC hsc_env)
2354 global_ids new_tyvars
2356 Linker.extendLinkEnv (zip names hValues)
2357 Linker.extendLinkEnv [(result_name, unsafeCoerce# apStack)]
2358 return (hsc_env{hsc_IC = ictxt}, result_name:names)
2360 mkNewId :: OccName -> Id -> IO Id
2362 let uniq = idUnique id
2363 loc = nameSrcLoc (idName id)
2364 name = mkInternalName uniq occ loc
2365 ty = tidyTopType (idType id)
2366 new_id = Id.mkGlobalId VanillaGlobal name ty (idInfo id)
2369 skolemiseTy :: Type -> (Type, TyVarSet)
2370 skolemiseTy ty = (substTy subst ty, mkVarSet new_tyvars)
2371 where env = mkVarEnv (zip tyvars new_tyvar_tys)
2372 subst = mkTvSubst emptyInScopeSet env
2373 tyvars = varSetElems (tyVarsOfType ty)
2374 new_tyvars = map skolemiseTyVar tyvars
2375 new_tyvar_tys = map mkTyVarTy new_tyvars
2377 skolemiseTyVar :: TyVar -> TyVar
2378 skolemiseTyVar tyvar = mkTcTyVar (tyVarName tyvar) (tyVarKind tyvar)
2379 (SkolemTv RuntimeUnkSkol)
2381 -----------------------------------------------------------------------------
2382 -- show a module and it's source/object filenames
2384 showModule :: Session -> ModSummary -> IO String
2385 showModule s mod_summary = withSession s $ \hsc_env ->
2386 isModuleInterpreted s mod_summary >>= \interpreted ->
2387 return (showModMsg (hscTarget(hsc_dflags hsc_env)) interpreted mod_summary)
2389 isModuleInterpreted :: Session -> ModSummary -> IO Bool
2390 isModuleInterpreted s mod_summary = withSession s $ \hsc_env ->
2391 case lookupUFM (hsc_HPT hsc_env) (ms_mod_name mod_summary) of
2392 Nothing -> panic "missing linkable"
2393 Just mod_info -> return (not obj_linkable)
2395 obj_linkable = isObjectLinkable (expectJust "showModule" (hm_linkable mod_info))
2397 obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term
2398 obtainTerm1 sess force mb_ty x = withSession sess $ \hsc_env -> cvObtainTerm hsc_env force mb_ty (unsafeCoerce# x)
2400 obtainTerm :: Session -> Bool -> Id -> IO (Maybe Term)
2401 obtainTerm sess force id = withSession sess $ \hsc_env -> do
2402 mb_v <- Linker.getHValue (varName id)
2404 Just v -> fmap Just$ cvObtainTerm hsc_env force (Just$ idType id) v
2405 Nothing -> return Nothing