1 -- -----------------------------------------------------------------------------
3 -- (c) The University of Glasgow, 2005
7 -- -----------------------------------------------------------------------------
13 defaultCleanupHandler,
17 -- * Flags and settings
18 DynFlags(..), DynFlag(..), Severity(..), GhcMode(..), HscTarget(..), dopt,
25 Target(..), TargetId(..), Phase,
32 -- * Loading\/compiling the program
34 load, LoadHowMuch(..), SuccessFlag(..), -- also does depanal
35 workingDirectoryChanged,
36 checkModule, CheckedModule(..),
37 TypecheckedSource, ParsedSource, RenamedSource,
39 -- * Inspecting the module structure of the program
40 ModuleGraph, ModSummary(..), ModLocation(..),
45 -- * Inspecting modules
50 modInfoPrintUnqualified,
53 modInfoIsExportedName,
58 PrintUnqualified, alwaysQualify,
60 -- * Interactive evaluation
61 getBindings, getPrintUnqual,
63 setContext, getContext,
77 -- * Abstract syntax elements
80 Module, mkModule, pprModule,
84 nameModule, nameParent_maybe, pprParenSymName, nameSrcLoc,
89 isImplicitId, isDeadBinder,
90 isExportedId, isLocalId, isGlobalId,
92 isPrimOpId, isFCallId, isClassOpId_maybe,
93 isDataConWorkId, idDataCon,
94 isBottomingId, isDictonaryId,
95 recordSelectorFieldLabel,
97 -- ** Type constructors
99 tyConTyVars, tyConDataCons, tyConArity,
100 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
107 -- ** Data constructors
109 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
110 dataConIsInfix, isVanillaDataCon,
112 StrictnessMark(..), isMarkedStrict,
116 classMethods, classSCTheta, classTvsFds,
121 instanceDFunId, pprInstance, pprInstanceHdr,
123 -- ** Types and Kinds
124 Type, dropForAlls, splitForAllTys, funResultTy, pprParendType,
127 ThetaType, pprThetaArrow,
133 module HsSyn, -- ToDo: remove extraneous bits
137 defaultFixity, maxPrecedence,
141 -- ** Source locations
145 GhcException(..), showGhcException,
155 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
156 * we need to expose DynFlags, so should parseDynamicFlags really be
157 part of this interface?
158 * what StaticFlags should we expose, if any?
161 #include "HsVersions.h"
164 import qualified Linker
165 import Linker ( HValue, extendLinkEnv )
166 import TcRnDriver ( tcRnLookupRdrName, tcRnGetInfo,
167 tcRnLookupName, getModuleExports )
168 import RdrName ( plusGlobalRdrEnv, Provenance(..),
169 ImportSpec(..), ImpDeclSpec(..), ImpItemSpec(..),
170 emptyGlobalRdrEnv, mkGlobalRdrEnv )
171 import HscMain ( hscParseIdentifier, hscStmt, hscTcExpr, hscKcType )
172 import Type ( tidyType )
173 import VarEnv ( emptyTidyEnv )
174 import GHC.Exts ( unsafeCoerce# )
177 import Packages ( initPackages )
178 import NameSet ( NameSet, nameSetToList, elemNameSet )
179 import RdrName ( GlobalRdrEnv, GlobalRdrElt(..), RdrName,
182 import Type ( Kind, Type, dropForAlls, PredType, ThetaType,
183 pprThetaArrow, pprParendType, splitForAllTys,
185 import Id ( Id, idType, isImplicitId, isDeadBinder,
186 isExportedId, isLocalId, isGlobalId,
187 isRecordSelector, recordSelectorFieldLabel,
188 isPrimOpId, isFCallId, isClassOpId_maybe,
189 isDataConWorkId, idDataCon,
192 import TysPrim ( alphaTyVars )
193 import TyCon ( TyCon, isClassTyCon, isSynTyCon, isNewTyCon,
194 isPrimTyCon, isFunTyCon, tyConArity,
195 tyConTyVars, tyConDataCons, getSynTyConDefn )
196 import Class ( Class, classSCTheta, classTvsFds, classMethods )
197 import FunDeps ( pprFundeps )
198 import DataCon ( DataCon, dataConWrapId, dataConSig, dataConTyCon,
199 dataConFieldLabels, dataConStrictMarks,
200 dataConIsInfix, isVanillaDataCon )
201 import Name ( Name, nameModule, NamedThing(..), nameParent_maybe,
203 import OccName ( parenSymOcc )
204 import NameEnv ( nameEnvElts )
205 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr )
207 import DriverPipeline
208 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
209 import GetImports ( getImports )
210 import Packages ( isHomePackage )
212 import HscMain ( newHscEnv, hscFileCheck, HscResult(..) )
216 import SysTools ( initSysTools, cleanTempFiles )
221 import Bag ( unitBag )
222 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
223 mkPlainErrMsg, printBagOfErrors, printErrorsAndWarnings )
224 import qualified ErrUtils
226 import StringBuffer ( StringBuffer, hGetStringBuffer )
228 import SysTools ( cleanTempFilesExcept )
230 import TcType ( tcSplitSigmaTy, isDictTy )
232 import Directory ( getModificationTime, doesFileExist )
233 import Maybe ( isJust, isNothing, fromJust )
234 import Maybes ( expectJust, mapCatMaybes )
235 import List ( partition, nub )
236 import qualified List
237 import Monad ( unless, when )
238 import System ( exitWith, ExitCode(..) )
239 import Time ( ClockTime )
240 import EXCEPTION as Exception hiding (handle)
243 import Prelude hiding (init)
245 -- -----------------------------------------------------------------------------
246 -- Exception handlers
248 -- | Install some default exception handlers and run the inner computation.
249 -- Unless you want to handle exceptions yourself, you should wrap this around
250 -- the top level of your program. The default handlers output the error
251 -- message(s) to stderr and exit cleanly.
252 defaultErrorHandler :: DynFlags -> IO a -> IO a
253 defaultErrorHandler dflags inner =
254 -- top-level exception handler: any unrecognised exception is a compiler bug.
255 handle (\exception -> do
258 -- an IO exception probably isn't our fault, so don't panic
260 fatalErrorMsg dflags (text (show exception))
261 AsyncException StackOverflow ->
262 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
264 fatalErrorMsg dflags (text (show (Panic (show exception))))
265 exitWith (ExitFailure 1)
268 -- program errors: messages with locations attached. Sometimes it is
269 -- convenient to just throw these as exceptions.
270 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
271 exitWith (ExitFailure 1)) $
273 -- error messages propagated as exceptions
274 handleDyn (\dyn -> do
277 PhaseFailed _ code -> exitWith code
278 Interrupted -> exitWith (ExitFailure 1)
279 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
280 exitWith (ExitFailure 1)
284 -- | Install a default cleanup handler to remove temporary files
285 -- deposited by a GHC run. This is seperate from
286 -- 'defaultErrorHandler', because you might want to override the error
287 -- handling, but still get the ordinary cleanup behaviour.
288 defaultCleanupHandler :: DynFlags -> IO a -> IO a
289 defaultCleanupHandler dflags inner =
290 -- make sure we clean up after ourselves
291 later (unless (dopt Opt_KeepTmpFiles dflags) $
292 cleanTempFiles dflags)
293 -- exceptions will be blocked while we clean the temporary files,
294 -- so there shouldn't be any difficulty if we receive further
299 -- | Initialises GHC. This must be done /once/ only. Takes the
300 -- command-line arguments. All command-line arguments which aren't
301 -- understood by GHC will be returned.
303 init :: [String] -> IO [String]
306 installSignalHandlers
308 -- Grab the -B option if there is one
309 let (minusB_args, argv1) = partition (prefixMatch "-B") args
310 dflags0 <- initSysTools minusB_args defaultDynFlags
311 writeIORef v_initDynFlags dflags0
313 -- Parse the static flags
314 argv2 <- parseStaticFlags argv1
317 GLOBAL_VAR(v_initDynFlags, error "initDynFlags", DynFlags)
318 -- stores the DynFlags between the call to init and subsequent
319 -- calls to newSession.
321 -- | Starts a new session. A session consists of a set of loaded
322 -- modules, a set of options (DynFlags), and an interactive context.
323 -- ToDo: GhcMode should say "keep typechecked code" and\/or "keep renamed
325 newSession :: GhcMode -> IO Session
327 dflags0 <- readIORef v_initDynFlags
328 dflags <- initDynFlags dflags0
329 env <- newHscEnv dflags{ ghcMode=mode }
333 -- tmp: this breaks the abstraction, but required because DriverMkDepend
334 -- needs to call the Finder. ToDo: untangle this.
335 sessionHscEnv :: Session -> IO HscEnv
336 sessionHscEnv (Session ref) = readIORef ref
338 withSession :: Session -> (HscEnv -> IO a) -> IO a
339 withSession (Session ref) f = do h <- readIORef ref; f h
341 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
342 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
344 -- -----------------------------------------------------------------------------
347 -- | Grabs the DynFlags from the Session
348 getSessionDynFlags :: Session -> IO DynFlags
349 getSessionDynFlags s = withSession s (return . hsc_dflags)
351 -- | Updates the DynFlags in a Session
352 setSessionDynFlags :: Session -> DynFlags -> IO ()
353 setSessionDynFlags s dflags = modifySession s (\h -> h{ hsc_dflags = dflags })
355 -- | If there is no -o option, guess the name of target executable
356 -- by using top-level source file name as a base.
357 guessOutputFile :: Session -> IO ()
358 guessOutputFile s = modifySession s $ \env ->
359 let dflags = hsc_dflags env
360 mod_graph = hsc_mod_graph env
361 mainModuleSrcPath, guessedName :: Maybe String
362 mainModuleSrcPath = do
363 let isMain = (== mainModIs dflags) . ms_mod
364 [ms] <- return (filter isMain mod_graph)
365 ml_hs_file (ms_location ms)
366 guessedName = fmap basenameOf mainModuleSrcPath
368 case outputFile dflags of
370 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
372 -- -----------------------------------------------------------------------------
375 -- ToDo: think about relative vs. absolute file paths. And what
376 -- happens when the current directory changes.
378 -- | Sets the targets for this session. Each target may be a module name
379 -- or a filename. The targets correspond to the set of root modules for
380 -- the program\/library. Unloading the current program is achieved by
381 -- setting the current set of targets to be empty, followed by load.
382 setTargets :: Session -> [Target] -> IO ()
383 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
385 -- | returns the current set of targets
386 getTargets :: Session -> IO [Target]
387 getTargets s = withSession s (return . hsc_targets)
389 -- | Add another target
390 addTarget :: Session -> Target -> IO ()
392 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
395 removeTarget :: Session -> TargetId -> IO ()
396 removeTarget s target_id
397 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
399 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
401 -- Attempts to guess what Target a string refers to. This function implements
402 -- the --make/GHCi command-line syntax for filenames:
404 -- - if the string looks like a Haskell source filename, then interpret
406 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
408 -- - otherwise interpret the string as a module name
410 guessTarget :: String -> Maybe Phase -> IO Target
411 guessTarget file (Just phase)
412 = return (Target (TargetFile file (Just phase)) Nothing)
413 guessTarget file Nothing
414 | isHaskellSrcFilename file
415 = return (Target (TargetFile file Nothing) Nothing)
417 = do exists <- doesFileExist hs_file
419 then return (Target (TargetFile hs_file Nothing) Nothing)
421 exists <- doesFileExist lhs_file
423 then return (Target (TargetFile lhs_file Nothing) Nothing)
425 return (Target (TargetModule (mkModule file)) Nothing)
427 hs_file = file `joinFileExt` "hs"
428 lhs_file = file `joinFileExt` "lhs"
430 -- -----------------------------------------------------------------------------
431 -- Loading the program
433 -- Perform a dependency analysis starting from the current targets
434 -- and update the session with the new module graph.
435 depanal :: Session -> [Module] -> Bool -> IO (Maybe ModuleGraph)
436 depanal (Session ref) excluded_mods allow_dup_roots = do
437 hsc_env <- readIORef ref
439 dflags = hsc_dflags hsc_env
440 gmode = ghcMode (hsc_dflags hsc_env)
441 targets = hsc_targets hsc_env
442 old_graph = hsc_mod_graph hsc_env
444 showPass dflags "Chasing dependencies"
445 when (gmode == BatchCompile) $
446 debugTraceMsg dflags 1 (hcat [
447 text "Chasing modules from: ",
448 hcat (punctuate comma (map pprTarget targets))])
450 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
452 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
457 -- | The result of load.
459 = LoadOk Errors -- ^ all specified targets were loaded successfully.
460 | LoadFailed Errors -- ^ not all modules were loaded.
462 type Errors = [String]
464 data ErrMsg = ErrMsg {
465 errMsgSeverity :: Severity, -- warning, error, etc.
466 errMsgSpans :: [SrcSpan],
467 errMsgShortDoc :: Doc,
468 errMsgExtraInfo :: Doc
475 | LoadDependenciesOf Module
477 -- | Try to load the program. If a Module is supplied, then just
478 -- attempt to load up to this target. If no Module is supplied,
479 -- then try to load all targets.
480 load :: Session -> LoadHowMuch -> IO SuccessFlag
481 load s@(Session ref) how_much
483 -- Dependency analysis first. Note that this fixes the module graph:
484 -- even if we don't get a fully successful upsweep, the full module
485 -- graph is still retained in the Session. We can tell which modules
486 -- were successfully loaded by inspecting the Session's HPT.
487 mb_graph <- depanal s [] False
489 Just mod_graph -> load2 s how_much mod_graph
490 Nothing -> return Failed
492 load2 s@(Session ref) how_much mod_graph = do
494 hsc_env <- readIORef ref
496 let hpt1 = hsc_HPT hsc_env
497 let dflags = hsc_dflags hsc_env
498 let ghci_mode = ghcMode dflags -- this never changes
500 -- The "bad" boot modules are the ones for which we have
501 -- B.hs-boot in the module graph, but no B.hs
502 -- The downsweep should have ensured this does not happen
504 let all_home_mods = [ms_mod s | s <- mod_graph, not (isBootSummary s)]
506 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
507 not (ms_mod s `elem` all_home_mods)]
509 ASSERT( null bad_boot_mods ) return ()
511 -- mg2_with_srcimps drops the hi-boot nodes, returning a
512 -- graph with cycles. Among other things, it is used for
513 -- backing out partially complete cycles following a failed
514 -- upsweep, and for removing from hpt all the modules
515 -- not in strict downwards closure, during calls to compile.
516 let mg2_with_srcimps :: [SCC ModSummary]
517 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
519 -- check the stability property for each module.
520 stable_mods@(stable_obj,stable_bco)
521 | BatchCompile <- ghci_mode = ([],[])
522 | otherwise = checkStability hpt1 mg2_with_srcimps all_home_mods
524 -- prune bits of the HPT which are definitely redundant now,
526 pruned_hpt = pruneHomePackageTable hpt1
527 (flattenSCCs mg2_with_srcimps)
532 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
533 text "Stable BCO:" <+> ppr stable_bco)
535 -- Unload any modules which are going to be re-linked this time around.
536 let stable_linkables = [ linkable
537 | m <- stable_obj++stable_bco,
538 Just hmi <- [lookupModuleEnv pruned_hpt m],
539 Just linkable <- [hm_linkable hmi] ]
540 unload hsc_env stable_linkables
542 -- We could at this point detect cycles which aren't broken by
543 -- a source-import, and complain immediately, but it seems better
544 -- to let upsweep_mods do this, so at least some useful work gets
545 -- done before the upsweep is abandoned.
546 --hPutStrLn stderr "after tsort:\n"
547 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
549 -- Now do the upsweep, calling compile for each module in
550 -- turn. Final result is version 3 of everything.
552 -- Topologically sort the module graph, this time including hi-boot
553 -- nodes, and possibly just including the portion of the graph
554 -- reachable from the module specified in the 2nd argument to load.
555 -- This graph should be cycle-free.
556 -- If we're restricting the upsweep to a portion of the graph, we
557 -- also want to retain everything that is still stable.
558 let full_mg :: [SCC ModSummary]
559 full_mg = topSortModuleGraph False mod_graph Nothing
561 maybe_top_mod = case how_much of
563 LoadDependenciesOf m -> Just m
566 partial_mg0 :: [SCC ModSummary]
567 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
569 -- LoadDependenciesOf m: we want the upsweep to stop just
570 -- short of the specified module (unless the specified module
573 | LoadDependenciesOf mod <- how_much
574 = ASSERT( case last partial_mg0 of
575 AcyclicSCC ms -> ms_mod ms == mod; _ -> False )
576 List.init partial_mg0
582 | AcyclicSCC ms <- full_mg,
583 ms_mod ms `elem` stable_obj++stable_bco,
584 ms_mod ms `notElem` [ ms_mod ms' |
585 AcyclicSCC ms' <- partial_mg ] ]
587 mg = stable_mg ++ partial_mg
589 -- clean up between compilations
590 let cleanup = cleanTempFilesExcept dflags
591 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
593 (upsweep_ok, hsc_env1, modsUpswept)
594 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
595 pruned_hpt stable_mods cleanup mg
597 -- Make modsDone be the summaries for each home module now
598 -- available; this should equal the domain of hpt3.
599 -- Get in in a roughly top .. bottom order (hence reverse).
601 let modsDone = reverse modsUpswept
603 -- Try and do linking in some form, depending on whether the
604 -- upsweep was completely or only partially successful.
606 if succeeded upsweep_ok
609 -- Easy; just relink it all.
610 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
612 -- Clean up after ourselves
613 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
615 -- Issue a warning for the confusing case where the user
616 -- said '-o foo' but we're not going to do any linking.
617 -- We attempt linking if either (a) one of the modules is
618 -- called Main, or (b) the user said -no-hs-main, indicating
619 -- that main() is going to come from somewhere else.
621 let ofile = outputFile dflags
622 let no_hs_main = dopt Opt_NoHsMain dflags
624 main_mod = mainModIs dflags
625 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
626 do_linking = a_root_is_Main || no_hs_main
628 when (ghci_mode == BatchCompile && isJust ofile && not do_linking) $
629 debugTraceMsg dflags 1 (text ("Warning: output was redirected with -o, " ++
630 "but no output will be generated\n" ++
631 "because there is no " ++ moduleString main_mod ++ " module."))
633 -- link everything together
634 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env1)
636 loadFinish Succeeded linkresult ref hsc_env1
639 -- Tricky. We need to back out the effects of compiling any
640 -- half-done cycles, both so as to clean up the top level envs
641 -- and to avoid telling the interactive linker to link them.
642 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
645 = map ms_mod modsDone
646 let mods_to_zap_names
647 = findPartiallyCompletedCycles modsDone_names
650 = filter ((`notElem` mods_to_zap_names).ms_mod)
653 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
656 -- Clean up after ourselves
657 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
659 -- there should be no Nothings where linkables should be, now
660 ASSERT(all (isJust.hm_linkable)
661 (moduleEnvElts (hsc_HPT hsc_env))) do
663 -- Link everything together
664 linkresult <- link ghci_mode dflags False hpt4
666 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
667 loadFinish Failed linkresult ref hsc_env4
669 -- Finish up after a load.
671 -- If the link failed, unload everything and return.
672 loadFinish all_ok Failed ref hsc_env
673 = do unload hsc_env []
674 writeIORef ref $! discardProg hsc_env
677 -- Empty the interactive context and set the module context to the topmost
678 -- newly loaded module, or the Prelude if none were loaded.
679 loadFinish all_ok Succeeded ref hsc_env
680 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
684 -- Forget the current program, but retain the persistent info in HscEnv
685 discardProg :: HscEnv -> HscEnv
687 = hsc_env { hsc_mod_graph = emptyMG,
688 hsc_IC = emptyInteractiveContext,
689 hsc_HPT = emptyHomePackageTable }
691 -- used to fish out the preprocess output files for the purposes of
692 -- cleaning up. The preprocessed file *might* be the same as the
693 -- source file, but that doesn't do any harm.
694 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
696 -- -----------------------------------------------------------------------------
700 CheckedModule { parsedSource :: ParsedSource,
701 renamedSource :: Maybe RenamedSource,
702 typecheckedSource :: Maybe TypecheckedSource,
703 checkedModuleInfo :: Maybe ModuleInfo
705 -- ToDo: improvements that could be made here:
706 -- if the module succeeded renaming but not typechecking,
707 -- we can still get back the GlobalRdrEnv and exports, so
708 -- perhaps the ModuleInfo should be split up into separate
709 -- fields within CheckedModule.
711 type ParsedSource = Located (HsModule RdrName)
712 type RenamedSource = HsGroup Name
713 type TypecheckedSource = LHsBinds Id
716 -- - things that aren't in the output of the renamer:
719 -- - things that aren't in the output of the typechecker right now:
723 -- - type/data/newtype declarations
724 -- - class declarations
726 -- - extra things in the typechecker's output:
727 -- - default methods are turned into top-level decls.
728 -- - dictionary bindings
731 -- | This is the way to get access to parsed and typechecked source code
732 -- for a module. 'checkModule' loads all the dependencies of the specified
733 -- module in the Session, and then attempts to typecheck the module. If
734 -- successful, it returns the abstract syntax for the module.
735 checkModule :: Session -> Module -> IO (Maybe CheckedModule)
736 checkModule session@(Session ref) mod = do
737 -- load up the dependencies first
738 r <- load session (LoadDependenciesOf mod)
739 if (failed r) then return Nothing else do
741 -- now parse & typecheck the module
742 hsc_env <- readIORef ref
743 let mg = hsc_mod_graph hsc_env
744 case [ ms | ms <- mg, ms_mod ms == mod ] of
747 -- Add in the OPTIONS from the source file This is nasty:
748 -- we've done this once already, in the compilation manager
749 -- It might be better to cache the flags in the
750 -- ml_hspp_file field, say
751 let dflags0 = hsc_dflags hsc_env
752 hspp_buf = expectJust "GHC.checkModule" (ms_hspp_buf ms)
753 filename = fromJust (ml_hs_file (ms_location ms))
754 opts = getOptionsFromStringBuffer hspp_buf filename
755 (dflags1,leftovers) <- parseDynamicFlags dflags0 (map snd opts)
756 if (not (null leftovers))
757 then do printErrorsAndWarnings dflags1 (optionsErrorMsgs leftovers opts filename)
761 r <- hscFileCheck hsc_env{hsc_dflags=dflags1} ms
765 HscChecked parsed renamed Nothing ->
766 return (Just (CheckedModule {
767 parsedSource = parsed,
768 renamedSource = renamed,
769 typecheckedSource = Nothing,
770 checkedModuleInfo = Nothing }))
771 HscChecked parsed renamed
772 (Just (tc_binds, rdr_env, details)) -> do
773 let minf = ModuleInfo {
774 minf_type_env = md_types details,
775 minf_exports = md_exports details,
776 minf_rdr_env = Just rdr_env,
777 minf_instances = md_insts details
779 return (Just (CheckedModule {
780 parsedSource = parsed,
781 renamedSource = renamed,
782 typecheckedSource = Just tc_binds,
783 checkedModuleInfo = Just minf }))
787 -- ---------------------------------------------------------------------------
790 unload :: HscEnv -> [Linkable] -> IO ()
791 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
792 = case ghcMode (hsc_dflags hsc_env) of
793 BatchCompile -> return ()
794 JustTypecheck -> return ()
796 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
798 Interactive -> panic "unload: no interpreter"
800 other -> panic "unload: strange mode"
802 -- -----------------------------------------------------------------------------
806 Stability tells us which modules definitely do not need to be recompiled.
807 There are two main reasons for having stability:
809 - avoid doing a complete upsweep of the module graph in GHCi when
810 modules near the bottom of the tree have not changed.
812 - to tell GHCi when it can load object code: we can only load object code
813 for a module when we also load object code fo all of the imports of the
814 module. So we need to know that we will definitely not be recompiling
815 any of these modules, and we can use the object code.
817 NB. stability is of no importance to BatchCompile at all, only Interactive.
818 (ToDo: what about JustTypecheck?)
820 The stability check is as follows. Both stableObject and
821 stableBCO are used during the upsweep phase later.
824 stable m = stableObject m || stableBCO m
827 all stableObject (imports m)
828 && old linkable does not exist, or is == on-disk .o
829 && date(on-disk .o) > date(.hs)
832 all stable (imports m)
833 && date(BCO) > date(.hs)
836 These properties embody the following ideas:
838 - if a module is stable:
839 - if it has been compiled in a previous pass (present in HPT)
840 then it does not need to be compiled or re-linked.
841 - if it has not been compiled in a previous pass,
842 then we only need to read its .hi file from disk and
843 link it to produce a ModDetails.
845 - if a modules is not stable, we will definitely be at least
846 re-linking, and possibly re-compiling it during the upsweep.
847 All non-stable modules can (and should) therefore be unlinked
850 - Note that objects are only considered stable if they only depend
851 on other objects. We can't link object code against byte code.
855 :: HomePackageTable -- HPT from last compilation
856 -> [SCC ModSummary] -- current module graph (cyclic)
857 -> [Module] -- all home modules
858 -> ([Module], -- stableObject
859 [Module]) -- stableBCO
861 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
863 checkSCC (stable_obj, stable_bco) scc0
864 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
865 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
866 | otherwise = (stable_obj, stable_bco)
868 scc = flattenSCC scc0
869 scc_mods = map ms_mod scc
870 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
872 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
873 -- all imports outside the current SCC, but in the home pkg
875 stable_obj_imps = map (`elem` stable_obj) scc_allimps
876 stable_bco_imps = map (`elem` stable_bco) scc_allimps
883 and (zipWith (||) stable_obj_imps stable_bco_imps)
887 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
891 same_as_prev t = case lookupModuleEnv hpt (ms_mod ms) of
892 Just hmi | Just l <- hm_linkable hmi
893 -> isObjectLinkable l && t == linkableTime l
895 -- why '>=' rather than '>' above? If the filesystem stores
896 -- times to the nearset second, we may occasionally find that
897 -- the object & source have the same modification time,
898 -- especially if the source was automatically generated
899 -- and compiled. Using >= is slightly unsafe, but it matches
903 = case lookupModuleEnv hpt (ms_mod ms) of
904 Just hmi | Just l <- hm_linkable hmi ->
905 not (isObjectLinkable l) &&
906 linkableTime l >= ms_hs_date ms
909 ms_allimps :: ModSummary -> [Module]
910 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
912 -- -----------------------------------------------------------------------------
913 -- Prune the HomePackageTable
915 -- Before doing an upsweep, we can throw away:
917 -- - For non-stable modules:
918 -- - all ModDetails, all linked code
919 -- - all unlinked code that is out of date with respect to
922 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
923 -- space at the end of the upsweep, because the topmost ModDetails of the
924 -- old HPT holds on to the entire type environment from the previous
927 pruneHomePackageTable
930 -> ([Module],[Module])
933 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
934 = mapModuleEnv prune hpt
936 | is_stable modl = hmi'
937 | otherwise = hmi'{ hm_details = emptyModDetails }
939 modl = mi_module (hm_iface hmi)
940 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
941 = hmi{ hm_linkable = Nothing }
944 where ms = expectJust "prune" (lookupModuleEnv ms_map modl)
946 ms_map = mkModuleEnv [(ms_mod ms, ms) | ms <- summ]
948 is_stable m = m `elem` stable_obj || m `elem` stable_bco
950 -- -----------------------------------------------------------------------------
952 -- Return (names of) all those in modsDone who are part of a cycle
953 -- as defined by theGraph.
954 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
955 findPartiallyCompletedCycles modsDone theGraph
959 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
960 chew ((CyclicSCC vs):rest)
961 = let names_in_this_cycle = nub (map ms_mod vs)
963 = nub ([done | done <- modsDone,
964 done `elem` names_in_this_cycle])
965 chewed_rest = chew rest
967 if notNull mods_in_this_cycle
968 && length mods_in_this_cycle < length names_in_this_cycle
969 then mods_in_this_cycle ++ chewed_rest
972 -- -----------------------------------------------------------------------------
975 -- This is where we compile each module in the module graph, in a pass
976 -- from the bottom to the top of the graph.
978 -- There better had not be any cyclic groups here -- we check for them.
981 :: HscEnv -- Includes initially-empty HPT
982 -> HomePackageTable -- HPT from last time round (pruned)
983 -> ([Module],[Module]) -- stable modules (see checkStability)
984 -> IO () -- How to clean up unwanted tmp files
985 -> [SCC ModSummary] -- Mods to do (the worklist)
987 HscEnv, -- With an updated HPT
988 [ModSummary]) -- Mods which succeeded
990 upsweep hsc_env old_hpt stable_mods cleanup mods
991 = upsweep' hsc_env old_hpt stable_mods cleanup mods 1 (length mods)
993 upsweep' hsc_env old_hpt stable_mods cleanup
995 = return (Succeeded, hsc_env, [])
997 upsweep' hsc_env old_hpt stable_mods cleanup
999 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1000 return (Failed, hsc_env, [])
1002 upsweep' hsc_env old_hpt stable_mods cleanup
1003 (AcyclicSCC mod:mods) mod_index nmods
1004 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1005 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1006 -- (moduleEnvElts (hsc_HPT hsc_env)))
1008 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1011 cleanup -- Remove unwanted tmp files between compilations
1014 Nothing -> return (Failed, hsc_env, [])
1016 { let this_mod = ms_mod mod
1018 -- Add new info to hsc_env
1019 hpt1 = extendModuleEnv (hsc_HPT hsc_env)
1021 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1023 -- Space-saving: delete the old HPT entry
1024 -- for mod BUT if mod is a hs-boot
1025 -- node, don't delete it. For the
1026 -- interface, the HPT entry is probaby for the
1027 -- main Haskell source file. Deleting it
1028 -- would force .. (what?? --SDM)
1029 old_hpt1 | isBootSummary mod = old_hpt
1030 | otherwise = delModuleEnv old_hpt this_mod
1032 ; (restOK, hsc_env2, modOKs)
1033 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1034 mods (mod_index+1) nmods
1035 ; return (restOK, hsc_env2, mod:modOKs)
1039 -- Compile a single module. Always produce a Linkable for it if
1040 -- successful. If no compilation happened, return the old Linkable.
1041 upsweep_mod :: HscEnv
1043 -> ([Module],[Module])
1045 -> Int -- index of module
1046 -> Int -- total number of modules
1047 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1049 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1052 this_mod = ms_mod summary
1053 mb_obj_date = ms_obj_date summary
1054 obj_fn = ml_obj_file (ms_location summary)
1055 hs_date = ms_hs_date summary
1057 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1058 compile_it = upsweep_compile hsc_env old_hpt this_mod
1059 summary mod_index nmods
1061 case ghcMode (hsc_dflags hsc_env) of
1064 -- Batch-compilating is easy: just check whether we have
1065 -- an up-to-date object file. If we do, then the compiler
1066 -- needs to do a recompilation check.
1067 _ | Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1069 findObjectLinkable this_mod obj_fn obj_date
1070 compile_it (Just linkable)
1077 _ | is_stable_obj, isJust old_hmi ->
1079 -- object is stable, and we have an entry in the
1080 -- old HPT: nothing to do
1082 | is_stable_obj, isNothing old_hmi -> do
1084 findObjectLinkable this_mod obj_fn
1085 (expectJust "upseep1" mb_obj_date)
1086 compile_it (Just linkable)
1087 -- object is stable, but we need to load the interface
1088 -- off disk to make a HMI.
1091 ASSERT(isJust old_hmi) -- must be in the old_hpt
1093 -- BCO is stable: nothing to do
1095 | Just hmi <- old_hmi,
1096 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1097 linkableTime l >= ms_hs_date summary ->
1099 -- we have an old BCO that is up to date with respect
1100 -- to the source: do a recompilation check as normal.
1104 -- no existing code at all: we must recompile.
1106 is_stable_obj = this_mod `elem` stable_obj
1107 is_stable_bco = this_mod `elem` stable_bco
1109 old_hmi = lookupModuleEnv old_hpt this_mod
1111 -- Run hsc to compile a module
1112 upsweep_compile hsc_env old_hpt this_mod summary
1114 mb_old_linkable = do
1116 -- The old interface is ok if it's in the old HPT
1117 -- a) we're compiling a source file, and the old HPT
1118 -- entry is for a source file
1119 -- b) we're compiling a hs-boot file
1120 -- Case (b) allows an hs-boot file to get the interface of its
1121 -- real source file on the second iteration of the compilation
1122 -- manager, but that does no harm. Otherwise the hs-boot file
1123 -- will always be recompiled
1126 = case lookupModuleEnv old_hpt this_mod of
1128 Just hm_info | isBootSummary summary -> Just iface
1129 | not (mi_boot iface) -> Just iface
1130 | otherwise -> Nothing
1132 iface = hm_iface hm_info
1134 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
1138 -- Compilation failed. Compile may still have updated the PCS, tho.
1139 CompErrs -> return Nothing
1141 -- Compilation "succeeded", and may or may not have returned a new
1142 -- linkable (depending on whether compilation was actually performed
1144 CompOK new_details new_iface new_linkable
1145 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1146 hm_details = new_details,
1147 hm_linkable = new_linkable }
1148 return (Just new_info)
1151 -- Filter modules in the HPT
1152 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1153 retainInTopLevelEnvs keep_these hpt
1154 = mkModuleEnv [ (mod, expectJust "retain" mb_mod_info)
1156 , let mb_mod_info = lookupModuleEnv hpt mod
1157 , isJust mb_mod_info ]
1159 -- ---------------------------------------------------------------------------
1160 -- Topological sort of the module graph
1163 :: Bool -- Drop hi-boot nodes? (see below)
1167 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1168 -- The resulting list of strongly-connected-components is in topologically
1169 -- sorted order, starting with the module(s) at the bottom of the
1170 -- dependency graph (ie compile them first) and ending with the ones at
1173 -- Drop hi-boot nodes (first boolean arg)?
1175 -- False: treat the hi-boot summaries as nodes of the graph,
1176 -- so the graph must be acyclic
1178 -- True: eliminate the hi-boot nodes, and instead pretend
1179 -- the a source-import of Foo is an import of Foo
1180 -- The resulting graph has no hi-boot nodes, but can by cyclic
1182 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1183 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1184 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1185 = stronglyConnComp (map vertex_fn (reachable graph root))
1187 -- restrict the graph to just those modules reachable from
1188 -- the specified module. We do this by building a graph with
1189 -- the full set of nodes, and determining the reachable set from
1190 -- the specified node.
1191 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1192 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1194 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1195 | otherwise = throwDyn (ProgramError "module does not exist")
1197 moduleGraphNodes :: Bool -> [ModSummary]
1198 -> ([(ModSummary, Int, [Int])], HscSource -> Module -> Maybe Int)
1199 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1201 -- Drop hs-boot nodes by using HsSrcFile as the key
1202 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1203 | otherwise = HsBootFile
1205 -- We use integers as the keys for the SCC algorithm
1206 nodes :: [(ModSummary, Int, [Int])]
1207 nodes = [(s, expectJust "topSort" (lookup_key (ms_hsc_src s) (ms_mod s)),
1208 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1209 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) )
1211 , not (isBootSummary s && drop_hs_boot_nodes) ]
1212 -- Drop the hi-boot ones if told to do so
1214 key_map :: NodeMap Int
1215 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1218 lookup_key :: HscSource -> Module -> Maybe Int
1219 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1221 out_edge_keys :: HscSource -> [Module] -> [Int]
1222 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1223 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1224 -- the IsBootInterface parameter True; else False
1227 type NodeKey = (Module, HscSource) -- The nodes of the graph are
1228 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1230 msKey :: ModSummary -> NodeKey
1231 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
1233 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1234 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1236 nodeMapElts :: NodeMap a -> [a]
1237 nodeMapElts = eltsFM
1239 -----------------------------------------------------------------------------
1240 -- Downsweep (dependency analysis)
1242 -- Chase downwards from the specified root set, returning summaries
1243 -- for all home modules encountered. Only follow source-import
1246 -- We pass in the previous collection of summaries, which is used as a
1247 -- cache to avoid recalculating a module summary if the source is
1250 -- The returned list of [ModSummary] nodes has one node for each home-package
1251 -- module, plus one for any hs-boot files. The imports of these nodes
1252 -- are all there, including the imports of non-home-package modules.
1255 -> [ModSummary] -- Old summaries
1256 -> [Module] -- Ignore dependencies on these; treat
1257 -- them as if they were package modules
1258 -> Bool -- True <=> allow multiple targets to have
1259 -- the same module name; this is
1260 -- very useful for ghc -M
1261 -> IO (Maybe [ModSummary])
1262 -- The elts of [ModSummary] all have distinct
1263 -- (Modules, IsBoot) identifiers, unless the Bool is true
1264 -- in which case there can be repeats
1265 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1266 = -- catch error messages and return them
1267 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1268 rootSummaries <- mapM getRootSummary roots
1269 let root_map = mkRootMap rootSummaries
1270 checkDuplicates root_map
1271 summs <- loop (concatMap msDeps rootSummaries) root_map
1274 roots = hsc_targets hsc_env
1276 old_summary_map :: NodeMap ModSummary
1277 old_summary_map = mkNodeMap old_summaries
1279 getRootSummary :: Target -> IO ModSummary
1280 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1281 = do exists <- doesFileExist file
1283 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1284 else throwDyn $ mkPlainErrMsg noSrcSpan $
1285 text "can't find file:" <+> text file
1286 getRootSummary (Target (TargetModule modl) maybe_buf)
1287 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1288 (L rootLoc modl) maybe_buf excl_mods
1289 case maybe_summary of
1290 Nothing -> packageModErr modl
1293 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1295 -- In a root module, the filename is allowed to diverge from the module
1296 -- name, so we have to check that there aren't multiple root files
1297 -- defining the same module (otherwise the duplicates will be silently
1298 -- ignored, leading to confusing behaviour).
1299 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1300 checkDuplicates root_map
1301 | allow_dup_roots = return ()
1302 | null dup_roots = return ()
1303 | otherwise = multiRootsErr (head dup_roots)
1305 dup_roots :: [[ModSummary]] -- Each at least of length 2
1306 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1308 loop :: [(Located Module,IsBootInterface)]
1309 -- Work list: process these modules
1310 -> NodeMap [ModSummary]
1311 -- Visited set; the range is a list because
1312 -- the roots can have the same module names
1313 -- if allow_dup_roots is True
1315 -- The result includes the worklist, except
1316 -- for those mentioned in the visited set
1317 loop [] done = return (concat (nodeMapElts done))
1318 loop ((wanted_mod, is_boot) : ss) done
1319 | Just summs <- lookupFM done key
1320 = if isSingleton summs then
1323 do { multiRootsErr summs; return [] }
1324 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1325 is_boot wanted_mod Nothing excl_mods
1327 Nothing -> loop ss done
1328 Just s -> loop (msDeps s ++ ss)
1329 (addToFM done key [s]) }
1331 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1333 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1334 mkRootMap summaries = addListToFM_C (++) emptyFM
1335 [ (msKey s, [s]) | s <- summaries ]
1337 msDeps :: ModSummary -> [(Located Module, IsBootInterface)]
1338 -- (msDeps s) returns the dependencies of the ModSummary s.
1339 -- A wrinkle is that for a {-# SOURCE #-} import we return
1340 -- *both* the hs-boot file
1341 -- *and* the source file
1342 -- as "dependencies". That ensures that the list of all relevant
1343 -- modules always contains B.hs if it contains B.hs-boot.
1344 -- Remember, this pass isn't doing the topological sort. It's
1345 -- just gathering the list of all relevant ModSummaries
1347 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1348 ++ [ (m,False) | m <- ms_imps s ]
1350 -----------------------------------------------------------------------------
1351 -- Summarising modules
1353 -- We have two types of summarisation:
1355 -- * Summarise a file. This is used for the root module(s) passed to
1356 -- cmLoadModules. The file is read, and used to determine the root
1357 -- module name. The module name may differ from the filename.
1359 -- * Summarise a module. We are given a module name, and must provide
1360 -- a summary. The finder is used to locate the file in which the module
1365 -> [ModSummary] -- old summaries
1366 -> FilePath -- source file name
1367 -> Maybe Phase -- start phase
1368 -> Maybe (StringBuffer,ClockTime)
1371 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1372 -- we can use a cached summary if one is available and the
1373 -- source file hasn't changed, But we have to look up the summary
1374 -- by source file, rather than module name as we do in summarise.
1375 | Just old_summary <- findSummaryBySourceFile old_summaries file
1377 let location = ms_location old_summary
1379 -- return the cached summary if the source didn't change
1380 src_timestamp <- case maybe_buf of
1381 Just (_,t) -> return t
1382 Nothing -> getModificationTime file
1383 -- The file exists; we checked in getRootSummary above.
1384 -- If it gets removed subsequently, then this
1385 -- getModificationTime may fail, but that's the right
1388 if ms_hs_date old_summary == src_timestamp
1389 then do -- update the object-file timestamp
1390 obj_timestamp <- getObjTimestamp location False
1391 return old_summary{ ms_obj_date = obj_timestamp }
1399 let dflags = hsc_dflags hsc_env
1401 (dflags', hspp_fn, buf)
1402 <- preprocessFile dflags file mb_phase maybe_buf
1404 (srcimps,the_imps, L _ mod) <- getImports dflags' buf hspp_fn
1406 -- Make a ModLocation for this file
1407 location <- mkHomeModLocation dflags mod file
1409 -- Tell the Finder cache where it is, so that subsequent calls
1410 -- to findModule will find it, even if it's not on any search path
1411 addHomeModuleToFinder hsc_env mod location
1413 src_timestamp <- case maybe_buf of
1414 Just (_,t) -> return t
1415 Nothing -> getModificationTime file
1416 -- getMofificationTime may fail
1418 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1420 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1421 ms_location = location,
1422 ms_hspp_file = Just hspp_fn,
1423 ms_hspp_buf = Just buf,
1424 ms_srcimps = srcimps, ms_imps = the_imps,
1425 ms_hs_date = src_timestamp,
1426 ms_obj_date = obj_timestamp })
1428 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1429 findSummaryBySourceFile summaries file
1430 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1431 fromJust (ml_hs_file (ms_location ms)) == file ] of
1435 -- Summarise a module, and pick up source and timestamp.
1438 -> NodeMap ModSummary -- Map of old summaries
1439 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1440 -> Located Module -- Imported module to be summarised
1441 -> Maybe (StringBuffer, ClockTime)
1442 -> [Module] -- Modules to exclude
1443 -> IO (Maybe ModSummary) -- Its new summary
1445 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1446 | wanted_mod `elem` excl_mods
1449 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1450 = do -- Find its new timestamp; all the
1451 -- ModSummaries in the old map have valid ml_hs_files
1452 let location = ms_location old_summary
1453 src_fn = expectJust "summariseModule" (ml_hs_file location)
1455 -- check the modification time on the source file, and
1456 -- return the cached summary if it hasn't changed. If the
1457 -- file has disappeared, we need to call the Finder again.
1459 Just (_,t) -> check_timestamp old_summary location src_fn t
1461 m <- IO.try (getModificationTime src_fn)
1463 Right t -> check_timestamp old_summary location src_fn t
1464 Left e | isDoesNotExistError e -> find_it
1465 | otherwise -> ioError e
1467 | otherwise = find_it
1469 dflags = hsc_dflags hsc_env
1471 hsc_src = if is_boot then HsBootFile else HsSrcFile
1473 check_timestamp old_summary location src_fn src_timestamp
1474 | ms_hs_date old_summary == src_timestamp = do
1475 -- update the object-file timestamp
1476 obj_timestamp <- getObjTimestamp location is_boot
1477 return (Just old_summary{ ms_obj_date = obj_timestamp })
1479 -- source changed: find and re-summarise. We call the finder
1480 -- again, because the user may have moved the source file.
1481 new_summary location src_fn src_timestamp
1484 -- Don't use the Finder's cache this time. If the module was
1485 -- previously a package module, it may have now appeared on the
1486 -- search path, so we want to consider it to be a home module. If
1487 -- the module was previously a home module, it may have moved.
1488 uncacheModule hsc_env wanted_mod
1489 found <- findModule hsc_env wanted_mod True {-explicit-}
1492 | not (isHomePackage pkg) -> return Nothing
1493 -- Drop external-pkg
1494 | isJust (ml_hs_file location) -> just_found location
1496 err -> noModError dflags loc wanted_mod err
1499 just_found location = do
1500 -- Adjust location to point to the hs-boot source file,
1501 -- hi file, object file, when is_boot says so
1502 let location' | is_boot = addBootSuffixLocn location
1503 | otherwise = location
1504 src_fn = expectJust "summarise2" (ml_hs_file location')
1506 -- Check that it exists
1507 -- It might have been deleted since the Finder last found it
1508 maybe_t <- modificationTimeIfExists src_fn
1510 Nothing -> noHsFileErr loc src_fn
1511 Just t -> new_summary location' src_fn t
1514 new_summary location src_fn src_timestamp
1516 -- Preprocess the source file and get its imports
1517 -- The dflags' contains the OPTIONS pragmas
1518 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1519 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1521 when (mod_name /= wanted_mod) $
1522 throwDyn $ mkPlainErrMsg mod_loc $
1523 text "file name does not match module name"
1524 <+> quotes (ppr mod_name)
1526 -- Find the object timestamp, and return the summary
1527 obj_timestamp <- getObjTimestamp location is_boot
1529 return (Just ( ModSummary { ms_mod = wanted_mod,
1530 ms_hsc_src = hsc_src,
1531 ms_location = location,
1532 ms_hspp_file = Just hspp_fn,
1533 ms_hspp_buf = Just buf,
1534 ms_srcimps = srcimps,
1536 ms_hs_date = src_timestamp,
1537 ms_obj_date = obj_timestamp }))
1540 getObjTimestamp location is_boot
1541 = if is_boot then return Nothing
1542 else modificationTimeIfExists (ml_obj_file location)
1545 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1546 -> IO (DynFlags, FilePath, StringBuffer)
1547 preprocessFile dflags src_fn mb_phase Nothing
1549 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1550 buf <- hGetStringBuffer hspp_fn
1551 return (dflags', hspp_fn, buf)
1553 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1555 -- case we bypass the preprocessing stage?
1557 local_opts = getOptionsFromStringBuffer buf src_fn
1559 (dflags', errs) <- parseDynamicFlags dflags (map snd local_opts)
1563 | Just (Unlit _) <- mb_phase = True
1564 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1565 -- note: local_opts is only required if there's no Unlit phase
1566 | dopt Opt_Cpp dflags' = True
1567 | dopt Opt_Pp dflags' = True
1570 when needs_preprocessing $
1571 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1573 return (dflags', src_fn, buf)
1576 -----------------------------------------------------------------------------
1578 -----------------------------------------------------------------------------
1580 noModError :: DynFlags -> SrcSpan -> Module -> FindResult -> IO ab
1581 -- ToDo: we don't have a proper line number for this error
1582 noModError dflags loc wanted_mod err
1583 = throwDyn $ mkPlainErrMsg loc $ cantFindError dflags wanted_mod err
1585 noHsFileErr loc path
1586 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1589 = throwDyn $ mkPlainErrMsg noSrcSpan $
1590 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1592 multiRootsErr :: [ModSummary] -> IO ()
1593 multiRootsErr summs@(summ1:_)
1594 = throwDyn $ mkPlainErrMsg noSrcSpan $
1595 text "module" <+> quotes (ppr mod) <+>
1596 text "is defined in multiple files:" <+>
1597 sep (map text files)
1600 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1602 cyclicModuleErr :: [ModSummary] -> SDoc
1604 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1605 2 (vcat (map show_one ms))
1607 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1608 nest 2 $ ptext SLIT("imports:") <+>
1609 (pp_imps HsBootFile (ms_srcimps ms)
1610 $$ pp_imps HsSrcFile (ms_imps ms))]
1611 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1612 pp_imps src mods = fsep (map (show_mod src) mods)
1615 -- | Inform GHC that the working directory has changed. GHC will flush
1616 -- its cache of module locations, since it may no longer be valid.
1617 -- Note: if you change the working directory, you should also unload
1618 -- the current program (set targets to empty, followed by load).
1619 workingDirectoryChanged :: Session -> IO ()
1620 workingDirectoryChanged s = withSession s $ \hsc_env ->
1621 flushFinderCache (hsc_FC hsc_env)
1623 -- -----------------------------------------------------------------------------
1624 -- inspecting the session
1626 -- | Get the module dependency graph.
1627 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1628 getModuleGraph s = withSession s (return . hsc_mod_graph)
1630 isLoaded :: Session -> Module -> IO Bool
1631 isLoaded s m = withSession s $ \hsc_env ->
1632 return $! isJust (lookupModuleEnv (hsc_HPT hsc_env) m)
1634 getBindings :: Session -> IO [TyThing]
1635 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1637 getPrintUnqual :: Session -> IO PrintUnqualified
1638 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1640 -- | Container for information about a 'Module'.
1641 data ModuleInfo = ModuleInfo {
1642 minf_type_env :: TypeEnv,
1643 minf_exports :: NameSet,
1644 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1645 minf_instances :: [Instance]
1646 -- ToDo: this should really contain the ModIface too
1648 -- We don't want HomeModInfo here, because a ModuleInfo applies
1649 -- to package modules too.
1651 -- | Request information about a loaded 'Module'
1652 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1653 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1654 let mg = hsc_mod_graph hsc_env
1655 if mdl `elem` map ms_mod mg
1656 then getHomeModuleInfo hsc_env mdl
1658 {- if isHomeModule (hsc_dflags hsc_env) mdl
1660 else -} getPackageModuleInfo hsc_env mdl
1661 -- getPackageModuleInfo will attempt to find the interface, so
1662 -- we don't want to call it for a home module, just in case there
1663 -- was a problem loading the module and the interface doesn't
1664 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1666 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1667 getPackageModuleInfo hsc_env mdl = do
1669 (_msgs, mb_names) <- getModuleExports hsc_env mdl
1671 Nothing -> return Nothing
1673 eps <- readIORef (hsc_EPS hsc_env)
1676 n_list = nameSetToList names
1677 tys = [ ty | name <- n_list,
1678 Just ty <- [lookupTypeEnv pte name] ]
1680 return (Just (ModuleInfo {
1681 minf_type_env = mkTypeEnv tys,
1682 minf_exports = names,
1683 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names mdl,
1684 minf_instances = error "getModuleInfo: instances for package module unimplemented"
1687 -- bogusly different for non-GHCI (ToDo)
1691 getHomeModuleInfo hsc_env mdl =
1692 case lookupModuleEnv (hsc_HPT hsc_env) mdl of
1693 Nothing -> return Nothing
1695 let details = hm_details hmi
1696 return (Just (ModuleInfo {
1697 minf_type_env = md_types details,
1698 minf_exports = md_exports details,
1699 minf_rdr_env = mi_globals $! hm_iface hmi,
1700 minf_instances = md_insts details
1703 -- | The list of top-level entities defined in a module
1704 modInfoTyThings :: ModuleInfo -> [TyThing]
1705 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1707 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1708 modInfoTopLevelScope minf
1709 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1711 modInfoExports :: ModuleInfo -> [Name]
1712 modInfoExports minf = nameSetToList $! minf_exports minf
1714 -- | Returns the instances defined by the specified module.
1715 -- Warning: currently unimplemented for package modules.
1716 modInfoInstances :: ModuleInfo -> [Instance]
1717 modInfoInstances = minf_instances
1719 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1720 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1722 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1723 modInfoPrintUnqualified minf = fmap unQualInScope (minf_rdr_env minf)
1725 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1726 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1727 case lookupTypeEnv (minf_type_env minf) name of
1728 Just tyThing -> return (Just tyThing)
1730 eps <- readIORef (hsc_EPS hsc_env)
1731 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1733 isDictonaryId :: Id -> Bool
1735 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1737 -- | Looks up a global name: that is, any top-level name in any
1738 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1739 -- the interactive context, and therefore does not require a preceding
1741 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1742 lookupGlobalName s name = withSession s $ \hsc_env -> do
1743 eps <- readIORef (hsc_EPS hsc_env)
1744 return $! lookupType (hsc_HPT hsc_env) (eps_PTE eps) name
1746 -- -----------------------------------------------------------------------------
1747 -- Misc exported utils
1749 dataConType :: DataCon -> Type
1750 dataConType dc = idType (dataConWrapId dc)
1752 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1753 pprParenSymName :: NamedThing a => a -> SDoc
1754 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1756 -- ----------------------------------------------------------------------------
1761 -- - Data and Typeable instances for HsSyn.
1763 -- ToDo: check for small transformations that happen to the syntax in
1764 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1766 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1767 -- to get from TyCons, Ids etc. to TH syntax (reify).
1769 -- :browse will use either lm_toplev or inspect lm_interface, depending
1770 -- on whether the module is interpreted or not.
1772 -- This is for reconstructing refactored source code
1773 -- Calls the lexer repeatedly.
1774 -- ToDo: add comment tokens to token stream
1775 getTokenStream :: Session -> Module -> IO [Located Token]
1778 -- -----------------------------------------------------------------------------
1779 -- Interactive evaluation
1783 -- | Set the interactive evaluation context.
1785 -- Setting the context doesn't throw away any bindings; the bindings
1786 -- we've built up in the InteractiveContext simply move to the new
1787 -- module. They always shadow anything in scope in the current context.
1788 setContext :: Session
1789 -> [Module] -- entire top level scope of these modules
1790 -> [Module] -- exports only of these modules
1792 setContext (Session ref) toplevs exports = do
1793 hsc_env <- readIORef ref
1794 let old_ic = hsc_IC hsc_env
1795 hpt = hsc_HPT hsc_env
1797 mapM_ (checkModuleExists hsc_env hpt) exports
1798 export_env <- mkExportEnv hsc_env exports
1799 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
1800 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1801 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplevs,
1802 ic_exports = exports,
1803 ic_rn_gbl_env = all_env }}
1806 -- Make a GlobalRdrEnv based on the exports of the modules only.
1807 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1808 mkExportEnv hsc_env mods = do
1809 stuff <- mapM (getModuleExports hsc_env) mods
1811 (_msgs, mb_name_sets) = unzip stuff
1812 gres = [ nameSetToGlobalRdrEnv name_set mod
1813 | (Just name_set, mod) <- zip mb_name_sets mods ]
1815 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1817 nameSetToGlobalRdrEnv :: NameSet -> Module -> GlobalRdrEnv
1818 nameSetToGlobalRdrEnv names mod =
1819 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1820 | name <- nameSetToList names ]
1822 vanillaProv :: Module -> Provenance
1823 -- We're building a GlobalRdrEnv as if the user imported
1824 -- all the specified modules into the global interactive module
1825 vanillaProv mod = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1827 decl = ImpDeclSpec { is_mod = mod, is_as = mod,
1829 is_dloc = srcLocSpan interactiveSrcLoc }
1831 checkModuleExists :: HscEnv -> HomePackageTable -> Module -> IO ()
1832 checkModuleExists hsc_env hpt mod =
1833 case lookupModuleEnv hpt mod of
1834 Just mod_info -> return ()
1835 _not_a_home_module -> do
1836 res <- findPackageModule hsc_env mod True
1838 Found _ _ -> return ()
1839 err -> let msg = cantFindError (hsc_dflags hsc_env) mod err in
1840 throwDyn (CmdLineError (showSDoc msg))
1842 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1843 mkTopLevEnv hpt modl
1844 = case lookupModuleEnv hpt modl of
1846 throwDyn (ProgramError ("mkTopLevEnv: not a home module "
1847 ++ showSDoc (pprModule modl)))
1849 case mi_globals (hm_iface details) of
1851 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
1852 ++ showSDoc (pprModule modl)))
1853 Just env -> return env
1855 -- | Get the interactive evaluation context, consisting of a pair of the
1856 -- set of modules from which we take the full top-level scope, and the set
1857 -- of modules from which we take just the exports respectively.
1858 getContext :: Session -> IO ([Module],[Module])
1859 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
1860 return (ic_toplev_scope ic, ic_exports ic))
1862 -- | Returns 'True' if the specified module is interpreted, and hence has
1863 -- its full top-level scope available.
1864 moduleIsInterpreted :: Session -> Module -> IO Bool
1865 moduleIsInterpreted s modl = withSession s $ \h ->
1866 case lookupModuleEnv (hsc_HPT h) modl of
1867 Just details -> return (isJust (mi_globals (hm_iface details)))
1868 _not_a_home_module -> return False
1870 -- | Looks up an identifier in the current interactive context (for :info)
1871 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
1872 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
1874 -- | Returns all names in scope in the current interactive context
1875 getNamesInScope :: Session -> IO [Name]
1876 getNamesInScope s = withSession s $ \hsc_env -> do
1877 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
1879 -- | Parses a string as an identifier, and returns the list of 'Name's that
1880 -- the identifier can refer to in the current interactive context.
1881 parseName :: Session -> String -> IO [Name]
1882 parseName s str = withSession s $ \hsc_env -> do
1883 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
1884 case maybe_rdr_name of
1885 Nothing -> return []
1886 Just (L _ rdr_name) -> do
1887 mb_names <- tcRnLookupRdrName hsc_env rdr_name
1889 Nothing -> return []
1890 Just ns -> return ns
1891 -- ToDo: should return error messages
1893 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
1894 -- entity known to GHC, including 'Name's defined using 'runStmt'.
1895 lookupName :: Session -> Name -> IO (Maybe TyThing)
1896 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
1898 -- -----------------------------------------------------------------------------
1899 -- Getting the type of an expression
1901 -- | Get the type of an expression
1902 exprType :: Session -> String -> IO (Maybe Type)
1903 exprType s expr = withSession s $ \hsc_env -> do
1904 maybe_stuff <- hscTcExpr hsc_env expr
1906 Nothing -> return Nothing
1907 Just ty -> return (Just tidy_ty)
1909 tidy_ty = tidyType emptyTidyEnv ty
1911 -- -----------------------------------------------------------------------------
1912 -- Getting the kind of a type
1914 -- | Get the kind of a type
1915 typeKind :: Session -> String -> IO (Maybe Kind)
1916 typeKind s str = withSession s $ \hsc_env -> do
1917 maybe_stuff <- hscKcType hsc_env str
1919 Nothing -> return Nothing
1920 Just kind -> return (Just kind)
1922 -----------------------------------------------------------------------------
1923 -- cmCompileExpr: compile an expression and deliver an HValue
1925 compileExpr :: Session -> String -> IO (Maybe HValue)
1926 compileExpr s expr = withSession s $ \hsc_env -> do
1927 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
1929 Nothing -> return Nothing
1930 Just (new_ic, names, hval) -> do
1932 hvals <- (unsafeCoerce# hval) :: IO [HValue]
1934 case (names,hvals) of
1935 ([n],[hv]) -> return (Just hv)
1936 _ -> panic "compileExpr"
1938 -- -----------------------------------------------------------------------------
1939 -- running a statement interactively
1942 = RunOk [Name] -- ^ names bound by this evaluation
1943 | RunFailed -- ^ statement failed compilation
1944 | RunException Exception -- ^ statement raised an exception
1946 -- | Run a statement in the current interactive context. Statemenet
1947 -- may bind multple values.
1948 runStmt :: Session -> String -> IO RunResult
1949 runStmt (Session ref) expr
1951 hsc_env <- readIORef ref
1953 -- Turn off -fwarn-unused-bindings when running a statement, to hide
1954 -- warnings about the implicit bindings we introduce.
1955 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
1956 hsc_env' = hsc_env{ hsc_dflags = dflags' }
1958 maybe_stuff <- hscStmt hsc_env' expr
1961 Nothing -> return RunFailed
1962 Just (new_hsc_env, names, hval) -> do
1964 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
1965 either_hvals <- sandboxIO thing_to_run
1967 case either_hvals of
1969 -- on error, keep the *old* interactive context,
1970 -- so that 'it' is not bound to something
1971 -- that doesn't exist.
1972 return (RunException e)
1975 -- Get the newly bound things, and bind them.
1976 -- Don't need to delete any shadowed bindings;
1977 -- the new ones override the old ones.
1978 extendLinkEnv (zip names hvals)
1980 writeIORef ref new_hsc_env
1981 return (RunOk names)
1984 -- We run the statement in a "sandbox" to protect the rest of the
1985 -- system from anything the expression might do. For now, this
1986 -- consists of just wrapping it in an exception handler, but see below
1987 -- for another version.
1989 sandboxIO :: IO a -> IO (Either Exception a)
1990 sandboxIO thing = Exception.try thing
1993 -- This version of sandboxIO runs the expression in a completely new
1994 -- RTS main thread. It is disabled for now because ^C exceptions
1995 -- won't be delivered to the new thread, instead they'll be delivered
1996 -- to the (blocked) GHCi main thread.
1998 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
2000 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
2001 sandboxIO thing = do
2002 st_thing <- newStablePtr (Exception.try thing)
2003 alloca $ \ p_st_result -> do
2004 stat <- rts_evalStableIO st_thing p_st_result
2005 freeStablePtr st_thing
2007 then do st_result <- peek p_st_result
2008 result <- deRefStablePtr st_result
2009 freeStablePtr st_result
2010 return (Right result)
2012 return (Left (fromIntegral stat))
2014 foreign import "rts_evalStableIO" {- safe -}
2015 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
2016 -- more informative than the C type!
2019 -----------------------------------------------------------------------------
2020 -- show a module and it's source/object filenames
2022 showModule :: Session -> ModSummary -> IO String
2023 showModule s mod_summary = withSession s $ \hsc_env -> do
2024 case lookupModuleEnv (hsc_HPT hsc_env) (ms_mod mod_summary) of
2025 Nothing -> panic "missing linkable"
2026 Just mod_info -> return (showModMsg obj_linkable mod_summary)
2028 obj_linkable = isObjectLinkable (fromJust (hm_linkable mod_info))