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),
93 -- * Abstract syntax elements
99 Module, mkModule, pprModule, moduleName, modulePackageId,
100 ModuleName, mkModuleName, moduleNameString,
104 nameModule, pprParenSymName, nameSrcLoc,
106 RdrName(Qual,Unqual),
110 isImplicitId, isDeadBinder,
111 isExportedId, isLocalId, isGlobalId,
113 isPrimOpId, isFCallId, isClassOpId_maybe,
114 isDataConWorkId, idDataCon,
115 isBottomingId, isDictonaryId,
116 recordSelectorFieldLabel,
118 -- ** Type constructors
120 tyConTyVars, tyConDataCons, tyConArity,
121 isClassTyCon, isSynTyCon, isNewTyCon, isPrimTyCon, isFunTyCon,
123 synTyConDefn, synTyConType, synTyConResKind,
129 -- ** Data constructors
131 dataConSig, dataConType, dataConTyCon, dataConFieldLabels,
132 dataConIsInfix, isVanillaDataCon,
134 StrictnessMark(..), isMarkedStrict,
138 classMethods, classSCTheta, classTvsFds,
143 instanceDFunId, pprInstance, pprInstanceHdr,
145 -- ** Types and Kinds
146 Type, dropForAlls, splitForAllTys, funResultTy,
147 pprParendType, pprTypeApp,
150 ThetaType, pprThetaArrow,
156 module HsSyn, -- ToDo: remove extraneous bits
160 defaultFixity, maxPrecedence,
164 -- ** Source locations
168 GhcException(..), showGhcException,
178 * inline bits of HscMain here to simplify layering: hscTcExpr, hscStmt.
179 * what StaticFlags should we expose, if any?
182 #include "HsVersions.h"
185 import RtClosureInspect ( cvObtainTerm, Term )
186 import TcRnDriver ( tcRnLookupRdrName, tcRnGetInfo,
187 tcRnLookupName, getModuleExports )
188 import VarEnv ( emptyTidyEnv )
189 import GHC.Exts ( unsafeCoerce#, Ptr )
190 import Foreign.StablePtr( deRefStablePtr, StablePtr, newStablePtr, freeStablePtr )
191 import Foreign ( poke )
192 import qualified Linker
194 import Data.Dynamic ( Dynamic )
195 import Linker ( HValue, getHValue, extendLinkEnv )
200 import HscMain ( hscParseIdentifier, hscTcExpr, hscKcType, hscStmt )
207 import Type hiding (typeKind)
209 import Var hiding (setIdType)
210 import TysPrim ( alphaTyVars )
215 import Name hiding ( varName )
216 import OccName ( parenSymOcc )
218 import InstEnv ( Instance, instanceDFunId, pprInstance, pprInstanceHdr )
220 import DriverPipeline
221 import DriverPhases ( Phase(..), isHaskellSrcFilename, startPhase )
222 import HeaderInfo ( getImports, getOptions )
224 import HscMain ( newHscEnv, hscFileCheck, HscChecked(..) )
227 import SysTools ( initSysTools, cleanTempFiles, cleanTempFilesExcept,
235 import Bag ( unitBag, listToBag )
236 import ErrUtils ( Severity(..), showPass, fatalErrorMsg, debugTraceMsg,
237 mkPlainErrMsg, printBagOfErrors, printBagOfWarnings,
239 import qualified ErrUtils
241 import StringBuffer ( StringBuffer, hGetStringBuffer )
244 import TcType ( tcSplitSigmaTy, isDictTy )
245 import Maybes ( expectJust, mapCatMaybes )
247 import HaddockLex ( tokenise )
249 import Control.Concurrent
250 import System.Directory ( getModificationTime, doesFileExist )
253 import qualified Data.List as List
255 import System.Exit ( exitWith, ExitCode(..) )
256 import System.Time ( ClockTime )
257 import Control.Exception as Exception hiding (handle)
260 import System.IO.Error ( isDoesNotExistError )
261 import Prelude hiding (init)
263 #if __GLASGOW_HASKELL__ < 600
264 import System.IO as System.IO.Error ( try )
266 import System.IO.Error ( try )
269 -- -----------------------------------------------------------------------------
270 -- Exception handlers
272 -- | Install some default exception handlers and run the inner computation.
273 -- Unless you want to handle exceptions yourself, you should wrap this around
274 -- the top level of your program. The default handlers output the error
275 -- message(s) to stderr and exit cleanly.
276 defaultErrorHandler :: DynFlags -> IO a -> IO a
277 defaultErrorHandler dflags inner =
278 -- top-level exception handler: any unrecognised exception is a compiler bug.
279 handle (\exception -> do
282 -- an IO exception probably isn't our fault, so don't panic
284 fatalErrorMsg dflags (text (show exception))
285 AsyncException StackOverflow ->
286 fatalErrorMsg dflags (text "stack overflow: use +RTS -K<size> to increase it")
288 fatalErrorMsg dflags (text (show (Panic (show exception))))
289 exitWith (ExitFailure 1)
292 -- program errors: messages with locations attached. Sometimes it is
293 -- convenient to just throw these as exceptions.
294 handleDyn (\dyn -> do printBagOfErrors dflags (unitBag dyn)
295 exitWith (ExitFailure 1)) $
297 -- error messages propagated as exceptions
298 handleDyn (\dyn -> do
301 PhaseFailed _ code -> exitWith code
302 Interrupted -> exitWith (ExitFailure 1)
303 _ -> do fatalErrorMsg dflags (text (show (dyn :: GhcException)))
304 exitWith (ExitFailure 1)
308 -- | Install a default cleanup handler to remove temporary files
309 -- deposited by a GHC run. This is seperate from
310 -- 'defaultErrorHandler', because you might want to override the error
311 -- handling, but still get the ordinary cleanup behaviour.
312 defaultCleanupHandler :: DynFlags -> IO a -> IO a
313 defaultCleanupHandler dflags inner =
314 -- make sure we clean up after ourselves
315 later (do cleanTempFiles dflags
318 -- exceptions will be blocked while we clean the temporary files,
319 -- so there shouldn't be any difficulty if we receive further
325 GLOBAL_VAR(v_bkptLinkEnv, [], [(Name, HValue)])
326 -- stores the current breakpoint handler to help setContext to
327 -- restore it after a context change
330 -- | Starts a new session. A session consists of a set of loaded
331 -- modules, a set of options (DynFlags), and an interactive context.
332 newSession :: Maybe FilePath -> IO Session
333 newSession mb_top_dir = do
335 main_thread <- myThreadId
336 modifyMVar_ interruptTargetThread (return . (main_thread :))
337 installSignalHandlers
339 dflags0 <- initSysTools mb_top_dir defaultDynFlags
340 dflags <- initDynFlags dflags0
341 env <- newHscEnv dflags
345 -- tmp: this breaks the abstraction, but required because DriverMkDepend
346 -- needs to call the Finder. ToDo: untangle this.
347 sessionHscEnv :: Session -> IO HscEnv
348 sessionHscEnv (Session ref) = readIORef ref
350 withSession :: Session -> (HscEnv -> IO a) -> IO a
351 withSession (Session ref) f = do h <- readIORef ref; f h
353 modifySession :: Session -> (HscEnv -> HscEnv) -> IO ()
354 modifySession (Session ref) f = do h <- readIORef ref; writeIORef ref $! f h
356 -- -----------------------------------------------------------------------------
359 -- | Grabs the DynFlags from the Session
360 getSessionDynFlags :: Session -> IO DynFlags
361 getSessionDynFlags s = withSession s (return . hsc_dflags)
363 -- | Updates the DynFlags in a Session. This also reads
364 -- the package database (unless it has already been read),
365 -- and prepares the compilers knowledge about packages. It
366 -- can be called again to load new packages: just add new
367 -- package flags to (packageFlags dflags).
369 -- Returns a list of new packages that may need to be linked in using
370 -- the dynamic linker (see 'linkPackages') as a result of new package
371 -- flags. If you are not doing linking or doing static linking, you
372 -- can ignore the list of packages returned.
374 setSessionDynFlags :: Session -> DynFlags -> IO [PackageId]
375 setSessionDynFlags (Session ref) dflags = do
376 hsc_env <- readIORef ref
377 (dflags', preload) <- initPackages dflags
378 writeIORef ref $! hsc_env{ hsc_dflags = dflags' }
381 -- | If there is no -o option, guess the name of target executable
382 -- by using top-level source file name as a base.
383 guessOutputFile :: Session -> IO ()
384 guessOutputFile s = modifySession s $ \env ->
385 let dflags = hsc_dflags env
386 mod_graph = hsc_mod_graph env
387 mainModuleSrcPath, guessedName :: Maybe String
388 mainModuleSrcPath = do
389 let isMain = (== mainModIs dflags) . ms_mod
390 [ms] <- return (filter isMain mod_graph)
391 ml_hs_file (ms_location ms)
392 guessedName = fmap basenameOf mainModuleSrcPath
394 case outputFile dflags of
396 Nothing -> env { hsc_dflags = dflags { outputFile = guessedName } }
398 -- -----------------------------------------------------------------------------
401 -- ToDo: think about relative vs. absolute file paths. And what
402 -- happens when the current directory changes.
404 -- | Sets the targets for this session. Each target may be a module name
405 -- or a filename. The targets correspond to the set of root modules for
406 -- the program\/library. Unloading the current program is achieved by
407 -- setting the current set of targets to be empty, followed by load.
408 setTargets :: Session -> [Target] -> IO ()
409 setTargets s targets = modifySession s (\h -> h{ hsc_targets = targets })
411 -- | returns the current set of targets
412 getTargets :: Session -> IO [Target]
413 getTargets s = withSession s (return . hsc_targets)
415 -- | Add another target
416 addTarget :: Session -> Target -> IO ()
418 = modifySession s (\h -> h{ hsc_targets = target : hsc_targets h })
421 removeTarget :: Session -> TargetId -> IO ()
422 removeTarget s target_id
423 = modifySession s (\h -> h{ hsc_targets = filter (hsc_targets h) })
425 filter targets = [ t | t@(Target id _) <- targets, id /= target_id ]
427 -- Attempts to guess what Target a string refers to. This function implements
428 -- the --make/GHCi command-line syntax for filenames:
430 -- - if the string looks like a Haskell source filename, then interpret
432 -- - if adding a .hs or .lhs suffix yields the name of an existing file,
434 -- - otherwise interpret the string as a module name
436 guessTarget :: String -> Maybe Phase -> IO Target
437 guessTarget file (Just phase)
438 = return (Target (TargetFile file (Just phase)) Nothing)
439 guessTarget file Nothing
440 | isHaskellSrcFilename file
441 = return (Target (TargetFile file Nothing) Nothing)
443 = do exists <- doesFileExist hs_file
445 then return (Target (TargetFile hs_file Nothing) Nothing)
447 exists <- doesFileExist lhs_file
449 then return (Target (TargetFile lhs_file Nothing) Nothing)
451 return (Target (TargetModule (mkModuleName file)) Nothing)
453 hs_file = file `joinFileExt` "hs"
454 lhs_file = file `joinFileExt` "lhs"
456 -- -----------------------------------------------------------------------------
457 -- Extending the program scope
459 extendGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
460 extendGlobalRdrScope session rdrElts
461 = modifySession session $ \hscEnv ->
462 let global_rdr = hsc_global_rdr_env hscEnv
463 in hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv global_rdr rdrElts }
465 setGlobalRdrScope :: Session -> [GlobalRdrElt] -> IO ()
466 setGlobalRdrScope session rdrElts
467 = modifySession session $ \hscEnv ->
468 hscEnv{ hsc_global_rdr_env = foldl extendGlobalRdrEnv emptyGlobalRdrEnv rdrElts }
470 extendGlobalTypeScope :: Session -> [Id] -> IO ()
471 extendGlobalTypeScope session ids
472 = modifySession session $ \hscEnv ->
473 let global_type = hsc_global_type_env hscEnv
474 in hscEnv{ hsc_global_type_env = extendTypeEnvWithIds global_type ids }
476 setGlobalTypeScope :: Session -> [Id] -> IO ()
477 setGlobalTypeScope session ids
478 = modifySession session $ \hscEnv ->
479 hscEnv{ hsc_global_type_env = extendTypeEnvWithIds emptyTypeEnv ids }
481 -- -----------------------------------------------------------------------------
482 -- Parsing Haddock comments
484 parseHaddockComment :: String -> Either String (HsDoc RdrName)
485 parseHaddockComment string = parseHaddockParagraphs (tokenise string)
487 -- -----------------------------------------------------------------------------
488 -- Loading the program
490 -- Perform a dependency analysis starting from the current targets
491 -- and update the session with the new module graph.
492 depanal :: Session -> [ModuleName] -> Bool -> IO (Maybe ModuleGraph)
493 depanal (Session ref) excluded_mods allow_dup_roots = do
494 hsc_env <- readIORef ref
496 dflags = hsc_dflags hsc_env
497 gmode = ghcMode (hsc_dflags hsc_env)
498 targets = hsc_targets hsc_env
499 old_graph = hsc_mod_graph hsc_env
501 showPass dflags "Chasing dependencies"
502 debugTraceMsg dflags 2 (hcat [
503 text "Chasing modules from: ",
504 hcat (punctuate comma (map pprTarget targets))])
506 r <- downsweep hsc_env old_graph excluded_mods allow_dup_roots
508 Just mod_graph -> writeIORef ref hsc_env{ hsc_mod_graph = mod_graph }
513 -- | The result of load.
515 = LoadOk Errors -- ^ all specified targets were loaded successfully.
516 | LoadFailed Errors -- ^ not all modules were loaded.
518 type Errors = [String]
520 data ErrMsg = ErrMsg {
521 errMsgSeverity :: Severity, -- warning, error, etc.
522 errMsgSpans :: [SrcSpan],
523 errMsgShortDoc :: Doc,
524 errMsgExtraInfo :: Doc
530 | LoadUpTo ModuleName
531 | LoadDependenciesOf ModuleName
533 -- | Try to load the program. If a Module is supplied, then just
534 -- attempt to load up to this target. If no Module is supplied,
535 -- then try to load all targets.
536 load :: Session -> LoadHowMuch -> IO SuccessFlag
537 load s@(Session ref) how_much
539 -- Dependency analysis first. Note that this fixes the module graph:
540 -- even if we don't get a fully successful upsweep, the full module
541 -- graph is still retained in the Session. We can tell which modules
542 -- were successfully loaded by inspecting the Session's HPT.
543 mb_graph <- depanal s [] False
545 Just mod_graph -> load2 s how_much mod_graph
546 Nothing -> return Failed
548 load2 s@(Session ref) how_much mod_graph = do
550 hsc_env <- readIORef ref
552 let hpt1 = hsc_HPT hsc_env
553 let dflags = hsc_dflags hsc_env
554 let ghci_mode = ghcMode dflags -- this never changes
556 -- The "bad" boot modules are the ones for which we have
557 -- B.hs-boot in the module graph, but no B.hs
558 -- The downsweep should have ensured this does not happen
560 let all_home_mods = [ms_mod_name s
561 | s <- mod_graph, not (isBootSummary s)]
563 bad_boot_mods = [s | s <- mod_graph, isBootSummary s,
564 not (ms_mod_name s `elem` all_home_mods)]
566 ASSERT( null bad_boot_mods ) return ()
568 -- mg2_with_srcimps drops the hi-boot nodes, returning a
569 -- graph with cycles. Among other things, it is used for
570 -- backing out partially complete cycles following a failed
571 -- upsweep, and for removing from hpt all the modules
572 -- not in strict downwards closure, during calls to compile.
573 let mg2_with_srcimps :: [SCC ModSummary]
574 mg2_with_srcimps = topSortModuleGraph True mod_graph Nothing
576 -- If we can determine that any of the {-# SOURCE #-} imports
577 -- are definitely unnecessary, then emit a warning.
578 warnUnnecessarySourceImports dflags mg2_with_srcimps
581 -- check the stability property for each module.
582 stable_mods@(stable_obj,stable_bco)
583 = checkStability hpt1 mg2_with_srcimps all_home_mods
585 -- prune bits of the HPT which are definitely redundant now,
587 pruned_hpt = pruneHomePackageTable hpt1
588 (flattenSCCs mg2_with_srcimps)
593 debugTraceMsg dflags 2 (text "Stable obj:" <+> ppr stable_obj $$
594 text "Stable BCO:" <+> ppr stable_bco)
596 -- Unload any modules which are going to be re-linked this time around.
597 let stable_linkables = [ linkable
598 | m <- stable_obj++stable_bco,
599 Just hmi <- [lookupUFM pruned_hpt m],
600 Just linkable <- [hm_linkable hmi] ]
601 unload hsc_env stable_linkables
603 -- We could at this point detect cycles which aren't broken by
604 -- a source-import, and complain immediately, but it seems better
605 -- to let upsweep_mods do this, so at least some useful work gets
606 -- done before the upsweep is abandoned.
607 --hPutStrLn stderr "after tsort:\n"
608 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
610 -- Now do the upsweep, calling compile for each module in
611 -- turn. Final result is version 3 of everything.
613 -- Topologically sort the module graph, this time including hi-boot
614 -- nodes, and possibly just including the portion of the graph
615 -- reachable from the module specified in the 2nd argument to load.
616 -- This graph should be cycle-free.
617 -- If we're restricting the upsweep to a portion of the graph, we
618 -- also want to retain everything that is still stable.
619 let full_mg :: [SCC ModSummary]
620 full_mg = topSortModuleGraph False mod_graph Nothing
622 maybe_top_mod = case how_much of
624 LoadDependenciesOf m -> Just m
627 partial_mg0 :: [SCC ModSummary]
628 partial_mg0 = topSortModuleGraph False mod_graph maybe_top_mod
630 -- LoadDependenciesOf m: we want the upsweep to stop just
631 -- short of the specified module (unless the specified module
634 | LoadDependenciesOf mod <- how_much
635 = ASSERT( case last partial_mg0 of
636 AcyclicSCC ms -> ms_mod_name ms == mod; _ -> False )
637 List.init partial_mg0
643 | AcyclicSCC ms <- full_mg,
644 ms_mod_name ms `elem` stable_obj++stable_bco,
645 ms_mod_name ms `notElem` [ ms_mod_name ms' |
646 AcyclicSCC ms' <- partial_mg ] ]
648 mg = stable_mg ++ partial_mg
650 -- clean up between compilations
651 let cleanup = cleanTempFilesExcept dflags
652 (ppFilesFromSummaries (flattenSCCs mg2_with_srcimps))
654 debugTraceMsg dflags 2 (hang (text "Ready for upsweep")
656 (upsweep_ok, hsc_env1, modsUpswept)
657 <- upsweep (hsc_env { hsc_HPT = emptyHomePackageTable })
658 pruned_hpt stable_mods cleanup mg
660 -- Make modsDone be the summaries for each home module now
661 -- available; this should equal the domain of hpt3.
662 -- Get in in a roughly top .. bottom order (hence reverse).
664 let modsDone = reverse modsUpswept
666 -- Try and do linking in some form, depending on whether the
667 -- upsweep was completely or only partially successful.
669 if succeeded upsweep_ok
672 -- Easy; just relink it all.
673 do debugTraceMsg dflags 2 (text "Upsweep completely successful.")
675 -- Clean up after ourselves
676 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
678 -- Issue a warning for the confusing case where the user
679 -- said '-o foo' but we're not going to do any linking.
680 -- We attempt linking if either (a) one of the modules is
681 -- called Main, or (b) the user said -no-hs-main, indicating
682 -- that main() is going to come from somewhere else.
684 let ofile = outputFile dflags
685 let no_hs_main = dopt Opt_NoHsMain dflags
687 main_mod = mainModIs dflags
688 a_root_is_Main = any ((==main_mod).ms_mod) mod_graph
689 do_linking = a_root_is_Main || no_hs_main
691 when (ghcLink dflags == LinkBinary
692 && isJust ofile && not do_linking) $
693 debugTraceMsg dflags 1 $
694 text ("Warning: output was redirected with -o, " ++
695 "but no output will be generated\n" ++
696 "because there is no " ++
697 moduleNameString (moduleName main_mod) ++ " module.")
699 -- link everything together
700 linkresult <- link (ghcLink dflags) dflags do_linking (hsc_HPT hsc_env1)
702 loadFinish Succeeded linkresult ref hsc_env1
705 -- Tricky. We need to back out the effects of compiling any
706 -- half-done cycles, both so as to clean up the top level envs
707 -- and to avoid telling the interactive linker to link them.
708 do debugTraceMsg dflags 2 (text "Upsweep partially successful.")
711 = map ms_mod modsDone
712 let mods_to_zap_names
713 = findPartiallyCompletedCycles modsDone_names
716 = filter ((`notElem` mods_to_zap_names).ms_mod)
719 let hpt4 = retainInTopLevelEnvs (map ms_mod_name mods_to_keep)
722 -- Clean up after ourselves
723 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
725 -- there should be no Nothings where linkables should be, now
726 ASSERT(all (isJust.hm_linkable)
727 (eltsUFM (hsc_HPT hsc_env))) do
729 -- Link everything together
730 linkresult <- link (ghcLink dflags) dflags False hpt4
732 let hsc_env4 = hsc_env1{ hsc_HPT = hpt4 }
733 loadFinish Failed linkresult ref hsc_env4
735 -- Finish up after a load.
737 -- If the link failed, unload everything and return.
738 loadFinish all_ok Failed ref hsc_env
739 = do unload hsc_env []
740 writeIORef ref $! discardProg hsc_env
743 -- Empty the interactive context and set the module context to the topmost
744 -- newly loaded module, or the Prelude if none were loaded.
745 loadFinish all_ok Succeeded ref hsc_env
746 = do writeIORef ref $! hsc_env{ hsc_IC = emptyInteractiveContext }
750 -- Forget the current program, but retain the persistent info in HscEnv
751 discardProg :: HscEnv -> HscEnv
753 = hsc_env { hsc_mod_graph = emptyMG,
754 hsc_IC = emptyInteractiveContext,
755 hsc_HPT = emptyHomePackageTable }
757 -- used to fish out the preprocess output files for the purposes of
758 -- cleaning up. The preprocessed file *might* be the same as the
759 -- source file, but that doesn't do any harm.
760 ppFilesFromSummaries summaries = map ms_hspp_file summaries
762 -- -----------------------------------------------------------------------------
766 CheckedModule { parsedSource :: ParsedSource,
767 renamedSource :: Maybe RenamedSource,
768 typecheckedSource :: Maybe TypecheckedSource,
769 checkedModuleInfo :: Maybe ModuleInfo
771 -- ToDo: improvements that could be made here:
772 -- if the module succeeded renaming but not typechecking,
773 -- we can still get back the GlobalRdrEnv and exports, so
774 -- perhaps the ModuleInfo should be split up into separate
775 -- fields within CheckedModule.
777 type ParsedSource = Located (HsModule RdrName)
778 type RenamedSource = (HsGroup Name, [LImportDecl Name], Maybe [LIE Name],
779 Maybe (HsDoc Name), HaddockModInfo Name)
780 type TypecheckedSource = LHsBinds Id
783 -- - things that aren't in the output of the typechecker right now:
787 -- - type/data/newtype declarations
788 -- - class declarations
790 -- - extra things in the typechecker's output:
791 -- - default methods are turned into top-level decls.
792 -- - dictionary bindings
795 -- | This is the way to get access to parsed and typechecked source code
796 -- for a module. 'checkModule' loads all the dependencies of the specified
797 -- module in the Session, and then attempts to typecheck the module. If
798 -- successful, it returns the abstract syntax for the module.
799 checkModule :: Session -> ModuleName -> IO (Maybe CheckedModule)
800 checkModule session@(Session ref) mod = do
801 -- load up the dependencies first
802 r <- load session (LoadDependenciesOf mod)
803 if (failed r) then return Nothing else do
805 -- now parse & typecheck the module
806 hsc_env <- readIORef ref
807 let mg = hsc_mod_graph hsc_env
808 case [ ms | ms <- mg, ms_mod_name ms == mod ] of
811 mbChecked <- hscFileCheck hsc_env{hsc_dflags=ms_hspp_opts ms} ms
813 Nothing -> return Nothing
814 Just (HscChecked parsed renamed Nothing) ->
815 return (Just (CheckedModule {
816 parsedSource = parsed,
817 renamedSource = renamed,
818 typecheckedSource = Nothing,
819 checkedModuleInfo = Nothing }))
820 Just (HscChecked parsed renamed
821 (Just (tc_binds, rdr_env, details))) -> do
822 let minf = ModuleInfo {
823 minf_type_env = md_types details,
824 minf_exports = availsToNameSet $
826 minf_rdr_env = Just rdr_env,
827 minf_instances = md_insts details
829 ,minf_modBreaks = emptyModBreaks
832 return (Just (CheckedModule {
833 parsedSource = parsed,
834 renamedSource = renamed,
835 typecheckedSource = Just tc_binds,
836 checkedModuleInfo = Just minf }))
838 -- ---------------------------------------------------------------------------
841 unload :: HscEnv -> [Linkable] -> IO ()
842 unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
843 = case ghcLink (hsc_dflags hsc_env) of
845 LinkInMemory -> Linker.unload (hsc_dflags hsc_env) stable_linkables
847 LinkInMemory -> panic "unload: no interpreter"
851 -- -----------------------------------------------------------------------------
855 Stability tells us which modules definitely do not need to be recompiled.
856 There are two main reasons for having stability:
858 - avoid doing a complete upsweep of the module graph in GHCi when
859 modules near the bottom of the tree have not changed.
861 - to tell GHCi when it can load object code: we can only load object code
862 for a module when we also load object code fo all of the imports of the
863 module. So we need to know that we will definitely not be recompiling
864 any of these modules, and we can use the object code.
866 The stability check is as follows. Both stableObject and
867 stableBCO are used during the upsweep phase later.
870 stable m = stableObject m || stableBCO m
873 all stableObject (imports m)
874 && old linkable does not exist, or is == on-disk .o
875 && date(on-disk .o) > date(.hs)
878 all stable (imports m)
879 && date(BCO) > date(.hs)
882 These properties embody the following ideas:
884 - if a module is stable, then:
885 - if it has been compiled in a previous pass (present in HPT)
886 then it does not need to be compiled or re-linked.
887 - if it has not been compiled in a previous pass,
888 then we only need to read its .hi file from disk and
889 link it to produce a ModDetails.
891 - if a modules is not stable, we will definitely be at least
892 re-linking, and possibly re-compiling it during the upsweep.
893 All non-stable modules can (and should) therefore be unlinked
896 - Note that objects are only considered stable if they only depend
897 on other objects. We can't link object code against byte code.
901 :: HomePackageTable -- HPT from last compilation
902 -> [SCC ModSummary] -- current module graph (cyclic)
903 -> [ModuleName] -- all home modules
904 -> ([ModuleName], -- stableObject
905 [ModuleName]) -- stableBCO
907 checkStability hpt sccs all_home_mods = foldl checkSCC ([],[]) sccs
909 checkSCC (stable_obj, stable_bco) scc0
910 | stableObjects = (scc_mods ++ stable_obj, stable_bco)
911 | stableBCOs = (stable_obj, scc_mods ++ stable_bco)
912 | otherwise = (stable_obj, stable_bco)
914 scc = flattenSCC scc0
915 scc_mods = map ms_mod_name scc
916 home_module m = m `elem` all_home_mods && m `notElem` scc_mods
918 scc_allimps = nub (filter home_module (concatMap ms_allimps scc))
919 -- all imports outside the current SCC, but in the home pkg
921 stable_obj_imps = map (`elem` stable_obj) scc_allimps
922 stable_bco_imps = map (`elem` stable_bco) scc_allimps
929 and (zipWith (||) stable_obj_imps stable_bco_imps)
933 | Just t <- ms_obj_date ms = t >= ms_hs_date ms
937 same_as_prev t = case lookupUFM hpt (ms_mod_name ms) of
938 Just hmi | Just l <- hm_linkable hmi
939 -> isObjectLinkable l && t == linkableTime l
941 -- why '>=' rather than '>' above? If the filesystem stores
942 -- times to the nearset second, we may occasionally find that
943 -- the object & source have the same modification time,
944 -- especially if the source was automatically generated
945 -- and compiled. Using >= is slightly unsafe, but it matches
949 = case lookupUFM hpt (ms_mod_name ms) of
950 Just hmi | Just l <- hm_linkable hmi ->
951 not (isObjectLinkable l) &&
952 linkableTime l >= ms_hs_date ms
955 ms_allimps :: ModSummary -> [ModuleName]
956 ms_allimps ms = map unLoc (ms_srcimps ms ++ ms_imps ms)
958 -- -----------------------------------------------------------------------------
959 -- Prune the HomePackageTable
961 -- Before doing an upsweep, we can throw away:
963 -- - For non-stable modules:
964 -- - all ModDetails, all linked code
965 -- - all unlinked code that is out of date with respect to
968 -- This is VERY IMPORTANT otherwise we'll end up requiring 2x the
969 -- space at the end of the upsweep, because the topmost ModDetails of the
970 -- old HPT holds on to the entire type environment from the previous
973 pruneHomePackageTable
976 -> ([ModuleName],[ModuleName])
979 pruneHomePackageTable hpt summ (stable_obj, stable_bco)
982 | is_stable modl = hmi'
983 | otherwise = hmi'{ hm_details = emptyModDetails }
985 modl = moduleName (mi_module (hm_iface hmi))
986 hmi' | Just l <- hm_linkable hmi, linkableTime l < ms_hs_date ms
987 = hmi{ hm_linkable = Nothing }
990 where ms = expectJust "prune" (lookupUFM ms_map modl)
992 ms_map = listToUFM [(ms_mod_name ms, ms) | ms <- summ]
994 is_stable m = m `elem` stable_obj || m `elem` stable_bco
996 -- -----------------------------------------------------------------------------
998 -- Return (names of) all those in modsDone who are part of a cycle
999 -- as defined by theGraph.
1000 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
1001 findPartiallyCompletedCycles modsDone theGraph
1005 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
1006 chew ((CyclicSCC vs):rest)
1007 = let names_in_this_cycle = nub (map ms_mod vs)
1009 = nub ([done | done <- modsDone,
1010 done `elem` names_in_this_cycle])
1011 chewed_rest = chew rest
1013 if notNull mods_in_this_cycle
1014 && length mods_in_this_cycle < length names_in_this_cycle
1015 then mods_in_this_cycle ++ chewed_rest
1018 -- -----------------------------------------------------------------------------
1021 -- This is where we compile each module in the module graph, in a pass
1022 -- from the bottom to the top of the graph.
1024 -- There better had not be any cyclic groups here -- we check for them.
1027 :: HscEnv -- Includes initially-empty HPT
1028 -> HomePackageTable -- HPT from last time round (pruned)
1029 -> ([ModuleName],[ModuleName]) -- stable modules (see checkStability)
1030 -> IO () -- How to clean up unwanted tmp files
1031 -> [SCC ModSummary] -- Mods to do (the worklist)
1033 HscEnv, -- With an updated HPT
1034 [ModSummary]) -- Mods which succeeded
1036 upsweep hsc_env old_hpt stable_mods cleanup mods
1037 = upsweep' hsc_env old_hpt stable_mods cleanup mods 1 (length mods)
1039 upsweep' hsc_env old_hpt stable_mods cleanup
1041 = return (Succeeded, hsc_env, [])
1043 upsweep' hsc_env old_hpt stable_mods cleanup
1044 (CyclicSCC ms:_) _ _
1045 = do fatalErrorMsg (hsc_dflags hsc_env) (cyclicModuleErr ms)
1046 return (Failed, hsc_env, [])
1048 upsweep' hsc_env old_hpt stable_mods cleanup
1049 (AcyclicSCC mod:mods) mod_index nmods
1050 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
1051 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
1052 -- (moduleEnvElts (hsc_HPT hsc_env)))
1054 mb_mod_info <- upsweep_mod hsc_env old_hpt stable_mods mod
1057 cleanup -- Remove unwanted tmp files between compilations
1060 Nothing -> return (Failed, hsc_env, [])
1062 { let this_mod = ms_mod_name mod
1064 -- Add new info to hsc_env
1065 hpt1 = addToUFM (hsc_HPT hsc_env) this_mod mod_info
1066 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1068 -- Space-saving: delete the old HPT entry
1069 -- for mod BUT if mod is a hs-boot
1070 -- node, don't delete it. For the
1071 -- interface, the HPT entry is probaby for the
1072 -- main Haskell source file. Deleting it
1073 -- would force .. (what?? --SDM)
1074 old_hpt1 | isBootSummary mod = old_hpt
1075 | otherwise = delFromUFM old_hpt this_mod
1077 ; (restOK, hsc_env2, modOKs)
1078 <- upsweep' hsc_env1 old_hpt1 stable_mods cleanup
1079 mods (mod_index+1) nmods
1080 ; return (restOK, hsc_env2, mod:modOKs)
1084 -- Compile a single module. Always produce a Linkable for it if
1085 -- successful. If no compilation happened, return the old Linkable.
1086 upsweep_mod :: HscEnv
1088 -> ([ModuleName],[ModuleName])
1090 -> Int -- index of module
1091 -> Int -- total number of modules
1092 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1094 upsweep_mod hsc_env old_hpt (stable_obj, stable_bco) summary mod_index nmods
1096 this_mod_name = ms_mod_name summary
1097 this_mod = ms_mod summary
1098 mb_obj_date = ms_obj_date summary
1099 obj_fn = ml_obj_file (ms_location summary)
1100 hs_date = ms_hs_date summary
1102 is_stable_obj = this_mod_name `elem` stable_obj
1103 is_stable_bco = this_mod_name `elem` stable_bco
1105 old_hmi = lookupUFM old_hpt this_mod_name
1107 -- We're using the dflags for this module now, obtained by
1108 -- applying any options in its LANGUAGE & OPTIONS_GHC pragmas.
1109 dflags = ms_hspp_opts summary
1110 prevailing_target = hscTarget (hsc_dflags hsc_env)
1111 local_target = hscTarget dflags
1113 -- If OPTIONS_GHC contains -fasm or -fvia-C, be careful that
1114 -- we don't do anything dodgy: these should only work to change
1115 -- from -fvia-C to -fasm and vice-versa, otherwise we could
1116 -- end up trying to link object code to byte code.
1117 target = if prevailing_target /= local_target
1118 && (not (isObjectTarget prevailing_target)
1119 || not (isObjectTarget local_target))
1120 then prevailing_target
1123 -- store the corrected hscTarget into the summary
1124 summary' = summary{ ms_hspp_opts = dflags { hscTarget = target } }
1126 -- The old interface is ok if
1127 -- a) we're compiling a source file, and the old HPT
1128 -- entry is for a source file
1129 -- b) we're compiling a hs-boot file
1130 -- Case (b) allows an hs-boot file to get the interface of its
1131 -- real source file on the second iteration of the compilation
1132 -- manager, but that does no harm. Otherwise the hs-boot file
1133 -- will always be recompiled
1138 Just hm_info | isBootSummary summary -> Just iface
1139 | not (mi_boot iface) -> Just iface
1140 | otherwise -> Nothing
1142 iface = hm_iface hm_info
1144 compile_it :: Maybe Linkable -> IO (Maybe HomeModInfo)
1145 compile_it = upsweep_compile hsc_env old_hpt this_mod_name
1146 summary' mod_index nmods mb_old_iface
1148 compile_it_discard_iface
1149 = upsweep_compile hsc_env old_hpt this_mod_name
1150 summary' mod_index nmods Nothing
1156 -- Regardless of whether we're generating object code or
1157 -- byte code, we can always use an existing object file
1158 -- if it is *stable* (see checkStability).
1159 | is_stable_obj, isJust old_hmi ->
1161 -- object is stable, and we have an entry in the
1162 -- old HPT: nothing to do
1164 | is_stable_obj, isNothing old_hmi -> do
1165 linkable <- findObjectLinkable this_mod obj_fn
1166 (expectJust "upseep1" mb_obj_date)
1167 compile_it (Just linkable)
1168 -- object is stable, but we need to load the interface
1169 -- off disk to make a HMI.
1173 ASSERT(isJust old_hmi) -- must be in the old_hpt
1175 -- BCO is stable: nothing to do
1177 | Just hmi <- old_hmi,
1178 Just l <- hm_linkable hmi, not (isObjectLinkable l),
1179 linkableTime l >= ms_hs_date summary ->
1181 -- we have an old BCO that is up to date with respect
1182 -- to the source: do a recompilation check as normal.
1186 -- no existing code at all: we must recompile.
1188 -- When generating object code, if there's an up-to-date
1189 -- object file on the disk, then we can use it.
1190 -- However, if the object file is new (compared to any
1191 -- linkable we had from a previous compilation), then we
1192 -- must discard any in-memory interface, because this
1193 -- means the user has compiled the source file
1194 -- separately and generated a new interface, that we must
1195 -- read from the disk.
1197 obj | isObjectTarget obj,
1198 Just obj_date <- mb_obj_date, obj_date >= hs_date -> do
1201 | Just l <- hm_linkable hmi,
1202 isObjectLinkable l && linkableTime l == obj_date
1203 -> compile_it (Just l)
1205 linkable <- findObjectLinkable this_mod obj_fn obj_date
1206 compile_it_discard_iface (Just linkable)
1212 -- Run hsc to compile a module
1213 upsweep_compile hsc_env old_hpt this_mod summary
1218 compresult <- compile hsc_env summary mb_old_linkable mb_old_iface
1222 -- Compilation failed. Compile may still have updated the PCS, tho.
1223 CompErrs -> return Nothing
1225 -- Compilation "succeeded", and may or may not have returned a new
1226 -- linkable (depending on whether compilation was actually performed
1228 CompOK new_details new_iface new_linkable
1229 -> do let new_info = HomeModInfo { hm_iface = new_iface,
1230 hm_details = new_details,
1231 hm_linkable = new_linkable }
1232 return (Just new_info)
1235 -- Filter modules in the HPT
1236 retainInTopLevelEnvs :: [ModuleName] -> HomePackageTable -> HomePackageTable
1237 retainInTopLevelEnvs keep_these hpt
1238 = listToUFM [ (mod, expectJust "retain" mb_mod_info)
1240 , let mb_mod_info = lookupUFM hpt mod
1241 , isJust mb_mod_info ]
1243 -- ---------------------------------------------------------------------------
1244 -- Topological sort of the module graph
1247 :: Bool -- Drop hi-boot nodes? (see below)
1251 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1252 -- The resulting list of strongly-connected-components is in topologically
1253 -- sorted order, starting with the module(s) at the bottom of the
1254 -- dependency graph (ie compile them first) and ending with the ones at
1257 -- Drop hi-boot nodes (first boolean arg)?
1259 -- False: treat the hi-boot summaries as nodes of the graph,
1260 -- so the graph must be acyclic
1262 -- True: eliminate the hi-boot nodes, and instead pretend
1263 -- the a source-import of Foo is an import of Foo
1264 -- The resulting graph has no hi-boot nodes, but can by cyclic
1266 topSortModuleGraph drop_hs_boot_nodes summaries Nothing
1267 = stronglyConnComp (fst (moduleGraphNodes drop_hs_boot_nodes summaries))
1268 topSortModuleGraph drop_hs_boot_nodes summaries (Just mod)
1269 = stronglyConnComp (map vertex_fn (reachable graph root))
1271 -- restrict the graph to just those modules reachable from
1272 -- the specified module. We do this by building a graph with
1273 -- the full set of nodes, and determining the reachable set from
1274 -- the specified node.
1275 (nodes, lookup_key) = moduleGraphNodes drop_hs_boot_nodes summaries
1276 (graph, vertex_fn, key_fn) = graphFromEdges' nodes
1278 | Just key <- lookup_key HsSrcFile mod, Just v <- key_fn key = v
1279 | otherwise = throwDyn (ProgramError "module does not exist")
1281 moduleGraphNodes :: Bool -> [ModSummary]
1282 -> ([(ModSummary, Int, [Int])], HscSource -> ModuleName -> Maybe Int)
1283 moduleGraphNodes drop_hs_boot_nodes summaries = (nodes, lookup_key)
1285 -- Drop hs-boot nodes by using HsSrcFile as the key
1286 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1287 | otherwise = HsBootFile
1289 -- We use integers as the keys for the SCC algorithm
1290 nodes :: [(ModSummary, Int, [Int])]
1291 nodes = [(s, expectJust "topSort" $
1292 lookup_key (ms_hsc_src s) (ms_mod_name s),
1293 out_edge_keys hs_boot_key (map unLoc (ms_srcimps s)) ++
1294 out_edge_keys HsSrcFile (map unLoc (ms_imps s)) ++
1295 (-- see [boot-edges] below
1296 if drop_hs_boot_nodes || ms_hsc_src s == HsBootFile
1298 else case lookup_key HsBootFile (ms_mod_name s) of
1303 , not (isBootSummary s && drop_hs_boot_nodes) ]
1304 -- Drop the hi-boot ones if told to do so
1306 -- [boot-edges] if this is a .hs and there is an equivalent
1307 -- .hs-boot, add a link from the former to the latter. This
1308 -- has the effect of detecting bogus cases where the .hs-boot
1309 -- depends on the .hs, by introducing a cycle. Additionally,
1310 -- it ensures that we will always process the .hs-boot before
1311 -- the .hs, and so the HomePackageTable will always have the
1312 -- most up to date information.
1314 key_map :: NodeMap Int
1315 key_map = listToFM ([(moduleName (ms_mod s), ms_hsc_src s)
1319 lookup_key :: HscSource -> ModuleName -> Maybe Int
1320 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1322 out_edge_keys :: HscSource -> [ModuleName] -> [Int]
1323 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1324 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1325 -- the IsBootInterface parameter True; else False
1328 type NodeKey = (ModuleName, HscSource) -- The nodes of the graph are
1329 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
1331 msKey :: ModSummary -> NodeKey
1332 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (moduleName mod,boot)
1334 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
1335 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
1337 nodeMapElts :: NodeMap a -> [a]
1338 nodeMapElts = eltsFM
1340 ms_mod_name :: ModSummary -> ModuleName
1341 ms_mod_name = moduleName . ms_mod
1343 -- If there are {-# SOURCE #-} imports between strongly connected
1344 -- components in the topological sort, then those imports can
1345 -- definitely be replaced by ordinary non-SOURCE imports: if SOURCE
1346 -- were necessary, then the edge would be part of a cycle.
1347 warnUnnecessarySourceImports :: DynFlags -> [SCC ModSummary] -> IO ()
1348 warnUnnecessarySourceImports dflags sccs =
1349 printBagOfWarnings dflags (listToBag (concat (map (check.flattenSCC) sccs)))
1351 let mods_in_this_cycle = map ms_mod_name ms in
1352 [ warn m i | m <- ms, i <- ms_srcimps m,
1353 unLoc i `notElem` mods_in_this_cycle ]
1355 warn :: ModSummary -> Located ModuleName -> WarnMsg
1356 warn ms (L loc mod) =
1358 (ptext SLIT("Warning: {-# SOURCE #-} unnecessary in import of ")
1359 <+> quotes (ppr mod))
1361 -----------------------------------------------------------------------------
1362 -- Downsweep (dependency analysis)
1364 -- Chase downwards from the specified root set, returning summaries
1365 -- for all home modules encountered. Only follow source-import
1368 -- We pass in the previous collection of summaries, which is used as a
1369 -- cache to avoid recalculating a module summary if the source is
1372 -- The returned list of [ModSummary] nodes has one node for each home-package
1373 -- module, plus one for any hs-boot files. The imports of these nodes
1374 -- are all there, including the imports of non-home-package modules.
1377 -> [ModSummary] -- Old summaries
1378 -> [ModuleName] -- Ignore dependencies on these; treat
1379 -- them as if they were package modules
1380 -> Bool -- True <=> allow multiple targets to have
1381 -- the same module name; this is
1382 -- very useful for ghc -M
1383 -> IO (Maybe [ModSummary])
1384 -- The elts of [ModSummary] all have distinct
1385 -- (Modules, IsBoot) identifiers, unless the Bool is true
1386 -- in which case there can be repeats
1387 downsweep hsc_env old_summaries excl_mods allow_dup_roots
1388 = -- catch error messages and return them
1389 handleDyn (\err_msg -> printBagOfErrors (hsc_dflags hsc_env) (unitBag err_msg) >> return Nothing) $ do
1390 rootSummaries <- mapM getRootSummary roots
1391 let root_map = mkRootMap rootSummaries
1392 checkDuplicates root_map
1393 summs <- loop (concatMap msDeps rootSummaries) root_map
1396 roots = hsc_targets hsc_env
1398 old_summary_map :: NodeMap ModSummary
1399 old_summary_map = mkNodeMap old_summaries
1401 getRootSummary :: Target -> IO ModSummary
1402 getRootSummary (Target (TargetFile file mb_phase) maybe_buf)
1403 = do exists <- doesFileExist file
1405 then summariseFile hsc_env old_summaries file mb_phase maybe_buf
1406 else throwDyn $ mkPlainErrMsg noSrcSpan $
1407 text "can't find file:" <+> text file
1408 getRootSummary (Target (TargetModule modl) maybe_buf)
1409 = do maybe_summary <- summariseModule hsc_env old_summary_map False
1410 (L rootLoc modl) maybe_buf excl_mods
1411 case maybe_summary of
1412 Nothing -> packageModErr modl
1415 rootLoc = mkGeneralSrcSpan FSLIT("<command line>")
1417 -- In a root module, the filename is allowed to diverge from the module
1418 -- name, so we have to check that there aren't multiple root files
1419 -- defining the same module (otherwise the duplicates will be silently
1420 -- ignored, leading to confusing behaviour).
1421 checkDuplicates :: NodeMap [ModSummary] -> IO ()
1422 checkDuplicates root_map
1423 | allow_dup_roots = return ()
1424 | null dup_roots = return ()
1425 | otherwise = multiRootsErr (head dup_roots)
1427 dup_roots :: [[ModSummary]] -- Each at least of length 2
1428 dup_roots = filterOut isSingleton (nodeMapElts root_map)
1430 loop :: [(Located ModuleName,IsBootInterface)]
1431 -- Work list: process these modules
1432 -> NodeMap [ModSummary]
1433 -- Visited set; the range is a list because
1434 -- the roots can have the same module names
1435 -- if allow_dup_roots is True
1437 -- The result includes the worklist, except
1438 -- for those mentioned in the visited set
1439 loop [] done = return (concat (nodeMapElts done))
1440 loop ((wanted_mod, is_boot) : ss) done
1441 | Just summs <- lookupFM done key
1442 = if isSingleton summs then
1445 do { multiRootsErr summs; return [] }
1446 | otherwise = do { mb_s <- summariseModule hsc_env old_summary_map
1447 is_boot wanted_mod Nothing excl_mods
1449 Nothing -> loop ss done
1450 Just s -> loop (msDeps s ++ ss)
1451 (addToFM done key [s]) }
1453 key = (unLoc wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1455 mkRootMap :: [ModSummary] -> NodeMap [ModSummary]
1456 mkRootMap summaries = addListToFM_C (++) emptyFM
1457 [ (msKey s, [s]) | s <- summaries ]
1459 msDeps :: ModSummary -> [(Located ModuleName, IsBootInterface)]
1460 -- (msDeps s) returns the dependencies of the ModSummary s.
1461 -- A wrinkle is that for a {-# SOURCE #-} import we return
1462 -- *both* the hs-boot file
1463 -- *and* the source file
1464 -- as "dependencies". That ensures that the list of all relevant
1465 -- modules always contains B.hs if it contains B.hs-boot.
1466 -- Remember, this pass isn't doing the topological sort. It's
1467 -- just gathering the list of all relevant ModSummaries
1469 concat [ [(m,True), (m,False)] | m <- ms_srcimps s ]
1470 ++ [ (m,False) | m <- ms_imps s ]
1472 -----------------------------------------------------------------------------
1473 -- Summarising modules
1475 -- We have two types of summarisation:
1477 -- * Summarise a file. This is used for the root module(s) passed to
1478 -- cmLoadModules. The file is read, and used to determine the root
1479 -- module name. The module name may differ from the filename.
1481 -- * Summarise a module. We are given a module name, and must provide
1482 -- a summary. The finder is used to locate the file in which the module
1487 -> [ModSummary] -- old summaries
1488 -> FilePath -- source file name
1489 -> Maybe Phase -- start phase
1490 -> Maybe (StringBuffer,ClockTime)
1493 summariseFile hsc_env old_summaries file mb_phase maybe_buf
1494 -- we can use a cached summary if one is available and the
1495 -- source file hasn't changed, But we have to look up the summary
1496 -- by source file, rather than module name as we do in summarise.
1497 | Just old_summary <- findSummaryBySourceFile old_summaries file
1499 let location = ms_location old_summary
1501 -- return the cached summary if the source didn't change
1502 src_timestamp <- case maybe_buf of
1503 Just (_,t) -> return t
1504 Nothing -> getModificationTime file
1505 -- The file exists; we checked in getRootSummary above.
1506 -- If it gets removed subsequently, then this
1507 -- getModificationTime may fail, but that's the right
1510 if ms_hs_date old_summary == src_timestamp
1511 then do -- update the object-file timestamp
1512 obj_timestamp <- getObjTimestamp location False
1513 return old_summary{ ms_obj_date = obj_timestamp }
1521 let dflags = hsc_dflags hsc_env
1523 (dflags', hspp_fn, buf)
1524 <- preprocessFile dflags file mb_phase maybe_buf
1526 (srcimps,the_imps, L _ mod_name) <- getImports dflags' buf hspp_fn
1528 -- Make a ModLocation for this file
1529 location <- mkHomeModLocation dflags mod_name file
1531 -- Tell the Finder cache where it is, so that subsequent calls
1532 -- to findModule will find it, even if it's not on any search path
1533 mod <- addHomeModuleToFinder hsc_env mod_name location
1535 src_timestamp <- case maybe_buf of
1536 Just (_,t) -> return t
1537 Nothing -> getModificationTime file
1538 -- getMofificationTime may fail
1540 obj_timestamp <- modificationTimeIfExists (ml_obj_file location)
1542 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1543 ms_location = location,
1544 ms_hspp_file = hspp_fn,
1545 ms_hspp_opts = dflags',
1546 ms_hspp_buf = Just buf,
1547 ms_srcimps = srcimps, ms_imps = the_imps,
1548 ms_hs_date = src_timestamp,
1549 ms_obj_date = obj_timestamp })
1551 findSummaryBySourceFile :: [ModSummary] -> FilePath -> Maybe ModSummary
1552 findSummaryBySourceFile summaries file
1553 = case [ ms | ms <- summaries, HsSrcFile <- [ms_hsc_src ms],
1554 expectJust "findSummaryBySourceFile" (ml_hs_file (ms_location ms)) == file ] of
1558 -- Summarise a module, and pick up source and timestamp.
1561 -> NodeMap ModSummary -- Map of old summaries
1562 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1563 -> Located ModuleName -- Imported module to be summarised
1564 -> Maybe (StringBuffer, ClockTime)
1565 -> [ModuleName] -- Modules to exclude
1566 -> IO (Maybe ModSummary) -- Its new summary
1568 summariseModule hsc_env old_summary_map is_boot (L loc wanted_mod) maybe_buf excl_mods
1569 | wanted_mod `elem` excl_mods
1572 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1573 = do -- Find its new timestamp; all the
1574 -- ModSummaries in the old map have valid ml_hs_files
1575 let location = ms_location old_summary
1576 src_fn = expectJust "summariseModule" (ml_hs_file location)
1578 -- check the modification time on the source file, and
1579 -- return the cached summary if it hasn't changed. If the
1580 -- file has disappeared, we need to call the Finder again.
1582 Just (_,t) -> check_timestamp old_summary location src_fn t
1584 m <- System.IO.Error.try (getModificationTime src_fn)
1586 Right t -> check_timestamp old_summary location src_fn t
1587 Left e | isDoesNotExistError e -> find_it
1588 | otherwise -> ioError e
1590 | otherwise = find_it
1592 dflags = hsc_dflags hsc_env
1594 hsc_src = if is_boot then HsBootFile else HsSrcFile
1596 check_timestamp old_summary location src_fn src_timestamp
1597 | ms_hs_date old_summary == src_timestamp = do
1598 -- update the object-file timestamp
1599 obj_timestamp <- getObjTimestamp location is_boot
1600 return (Just old_summary{ ms_obj_date = obj_timestamp })
1602 -- source changed: re-summarise.
1603 new_summary location (ms_mod old_summary) src_fn src_timestamp
1606 -- Don't use the Finder's cache this time. If the module was
1607 -- previously a package module, it may have now appeared on the
1608 -- search path, so we want to consider it to be a home module. If
1609 -- the module was previously a home module, it may have moved.
1610 uncacheModule hsc_env wanted_mod
1611 found <- findImportedModule hsc_env wanted_mod Nothing
1614 | isJust (ml_hs_file location) ->
1616 just_found location mod
1618 -- Drop external-pkg
1619 ASSERT(modulePackageId mod /= thisPackage dflags)
1623 err -> noModError dflags loc wanted_mod err
1626 just_found location mod = do
1627 -- Adjust location to point to the hs-boot source file,
1628 -- hi file, object file, when is_boot says so
1629 let location' | is_boot = addBootSuffixLocn location
1630 | otherwise = location
1631 src_fn = expectJust "summarise2" (ml_hs_file location')
1633 -- Check that it exists
1634 -- It might have been deleted since the Finder last found it
1635 maybe_t <- modificationTimeIfExists src_fn
1637 Nothing -> noHsFileErr loc src_fn
1638 Just t -> new_summary location' mod src_fn t
1641 new_summary location mod src_fn src_timestamp
1643 -- Preprocess the source file and get its imports
1644 -- The dflags' contains the OPTIONS pragmas
1645 (dflags', hspp_fn, buf) <- preprocessFile dflags src_fn Nothing maybe_buf
1646 (srcimps, the_imps, L mod_loc mod_name) <- getImports dflags' buf hspp_fn
1648 when (mod_name /= wanted_mod) $
1649 throwDyn $ mkPlainErrMsg mod_loc $
1650 text "file name does not match module name"
1651 <+> quotes (ppr mod_name)
1653 -- Find the object timestamp, and return the summary
1654 obj_timestamp <- getObjTimestamp location is_boot
1656 return (Just ( ModSummary { ms_mod = mod,
1657 ms_hsc_src = hsc_src,
1658 ms_location = location,
1659 ms_hspp_file = hspp_fn,
1660 ms_hspp_opts = dflags',
1661 ms_hspp_buf = Just buf,
1662 ms_srcimps = srcimps,
1664 ms_hs_date = src_timestamp,
1665 ms_obj_date = obj_timestamp }))
1668 getObjTimestamp location is_boot
1669 = if is_boot then return Nothing
1670 else modificationTimeIfExists (ml_obj_file location)
1673 preprocessFile :: DynFlags -> FilePath -> Maybe Phase -> Maybe (StringBuffer,ClockTime)
1674 -> IO (DynFlags, FilePath, StringBuffer)
1675 preprocessFile dflags src_fn mb_phase Nothing
1677 (dflags', hspp_fn) <- preprocess dflags (src_fn, mb_phase)
1678 buf <- hGetStringBuffer hspp_fn
1679 return (dflags', hspp_fn, buf)
1681 preprocessFile dflags src_fn mb_phase (Just (buf, time))
1683 -- case we bypass the preprocessing stage?
1685 local_opts = getOptions buf src_fn
1687 (dflags', errs) <- parseDynamicFlags dflags (map unLoc local_opts)
1691 | Just (Unlit _) <- mb_phase = True
1692 | Nothing <- mb_phase, Unlit _ <- startPhase src_fn = True
1693 -- note: local_opts is only required if there's no Unlit phase
1694 | dopt Opt_Cpp dflags' = True
1695 | dopt Opt_Pp dflags' = True
1698 when needs_preprocessing $
1699 ghcError (ProgramError "buffer needs preprocesing; interactive check disabled")
1701 return (dflags', src_fn, buf)
1704 -----------------------------------------------------------------------------
1706 -----------------------------------------------------------------------------
1708 noModError :: DynFlags -> SrcSpan -> ModuleName -> FindResult -> IO ab
1709 -- ToDo: we don't have a proper line number for this error
1710 noModError dflags loc wanted_mod err
1711 = throwDyn $ mkPlainErrMsg loc $ cannotFindModule dflags wanted_mod err
1713 noHsFileErr loc path
1714 = throwDyn $ mkPlainErrMsg loc $ text "Can't find" <+> text path
1717 = throwDyn $ mkPlainErrMsg noSrcSpan $
1718 text "module" <+> quotes (ppr mod) <+> text "is a package module"
1720 multiRootsErr :: [ModSummary] -> IO ()
1721 multiRootsErr summs@(summ1:_)
1722 = throwDyn $ mkPlainErrMsg noSrcSpan $
1723 text "module" <+> quotes (ppr mod) <+>
1724 text "is defined in multiple files:" <+>
1725 sep (map text files)
1728 files = map (expectJust "checkDup" . ml_hs_file . ms_location) summs
1730 cyclicModuleErr :: [ModSummary] -> SDoc
1732 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1733 2 (vcat (map show_one ms))
1735 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1736 nest 2 $ ptext SLIT("imports:") <+>
1737 (pp_imps HsBootFile (ms_srcimps ms)
1738 $$ pp_imps HsSrcFile (ms_imps ms))]
1739 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1740 pp_imps src mods = fsep (map (show_mod src) mods)
1743 -- | Inform GHC that the working directory has changed. GHC will flush
1744 -- its cache of module locations, since it may no longer be valid.
1745 -- Note: if you change the working directory, you should also unload
1746 -- the current program (set targets to empty, followed by load).
1747 workingDirectoryChanged :: Session -> IO ()
1748 workingDirectoryChanged s = withSession s $ flushFinderCaches
1750 -- -----------------------------------------------------------------------------
1751 -- inspecting the session
1753 -- | Get the module dependency graph.
1754 getModuleGraph :: Session -> IO ModuleGraph -- ToDo: DiGraph ModSummary
1755 getModuleGraph s = withSession s (return . hsc_mod_graph)
1757 isLoaded :: Session -> ModuleName -> IO Bool
1758 isLoaded s m = withSession s $ \hsc_env ->
1759 return $! isJust (lookupUFM (hsc_HPT hsc_env) m)
1761 getBindings :: Session -> IO [TyThing]
1762 getBindings s = withSession s (return . nameEnvElts . ic_type_env . hsc_IC)
1764 getPrintUnqual :: Session -> IO PrintUnqualified
1765 getPrintUnqual s = withSession s (return . icPrintUnqual . hsc_IC)
1767 -- | Container for information about a 'Module'.
1768 data ModuleInfo = ModuleInfo {
1769 minf_type_env :: TypeEnv,
1770 minf_exports :: NameSet, -- ToDo, [AvailInfo] like ModDetails?
1771 minf_rdr_env :: Maybe GlobalRdrEnv, -- Nothing for a compiled/package mod
1772 minf_instances :: [Instance]
1774 ,minf_modBreaks :: ModBreaks
1776 -- ToDo: this should really contain the ModIface too
1778 -- We don't want HomeModInfo here, because a ModuleInfo applies
1779 -- to package modules too.
1781 -- | Request information about a loaded 'Module'
1782 getModuleInfo :: Session -> Module -> IO (Maybe ModuleInfo)
1783 getModuleInfo s mdl = withSession s $ \hsc_env -> do
1784 let mg = hsc_mod_graph hsc_env
1785 if mdl `elem` map ms_mod mg
1786 then getHomeModuleInfo hsc_env (moduleName mdl)
1788 {- if isHomeModule (hsc_dflags hsc_env) mdl
1790 else -} getPackageModuleInfo hsc_env mdl
1791 -- getPackageModuleInfo will attempt to find the interface, so
1792 -- we don't want to call it for a home module, just in case there
1793 -- was a problem loading the module and the interface doesn't
1794 -- exist... hence the isHomeModule test here. (ToDo: reinstate)
1796 getPackageModuleInfo :: HscEnv -> Module -> IO (Maybe ModuleInfo)
1797 getPackageModuleInfo hsc_env mdl = do
1799 (_msgs, mb_avails) <- getModuleExports hsc_env mdl
1801 Nothing -> return Nothing
1803 eps <- readIORef (hsc_EPS hsc_env)
1805 names = availsToNameSet avails
1807 tys = [ ty | name <- concatMap availNames avails,
1808 Just ty <- [lookupTypeEnv pte name] ]
1810 return (Just (ModuleInfo {
1811 minf_type_env = mkTypeEnv tys,
1812 minf_exports = names,
1813 minf_rdr_env = Just $! nameSetToGlobalRdrEnv names (moduleName mdl),
1814 minf_instances = error "getModuleInfo: instances for package module unimplemented",
1815 minf_modBreaks = emptyModBreaks
1818 -- bogusly different for non-GHCI (ToDo)
1822 getHomeModuleInfo hsc_env mdl =
1823 case lookupUFM (hsc_HPT hsc_env) mdl of
1824 Nothing -> return Nothing
1826 let details = hm_details hmi
1827 return (Just (ModuleInfo {
1828 minf_type_env = md_types details,
1829 minf_exports = availsToNameSet (md_exports details),
1830 minf_rdr_env = mi_globals $! hm_iface hmi,
1831 minf_instances = md_insts details
1833 ,minf_modBreaks = md_modBreaks details
1837 -- | The list of top-level entities defined in a module
1838 modInfoTyThings :: ModuleInfo -> [TyThing]
1839 modInfoTyThings minf = typeEnvElts (minf_type_env minf)
1841 modInfoTopLevelScope :: ModuleInfo -> Maybe [Name]
1842 modInfoTopLevelScope minf
1843 = fmap (map gre_name . globalRdrEnvElts) (minf_rdr_env minf)
1845 modInfoExports :: ModuleInfo -> [Name]
1846 modInfoExports minf = nameSetToList $! minf_exports minf
1848 -- | Returns the instances defined by the specified module.
1849 -- Warning: currently unimplemented for package modules.
1850 modInfoInstances :: ModuleInfo -> [Instance]
1851 modInfoInstances = minf_instances
1853 modInfoIsExportedName :: ModuleInfo -> Name -> Bool
1854 modInfoIsExportedName minf name = elemNameSet name (minf_exports minf)
1856 modInfoPrintUnqualified :: ModuleInfo -> Maybe PrintUnqualified
1857 modInfoPrintUnqualified minf = fmap mkPrintUnqualified (minf_rdr_env minf)
1859 modInfoLookupName :: Session -> ModuleInfo -> Name -> IO (Maybe TyThing)
1860 modInfoLookupName s minf name = withSession s $ \hsc_env -> do
1861 case lookupTypeEnv (minf_type_env minf) name of
1862 Just tyThing -> return (Just tyThing)
1864 eps <- readIORef (hsc_EPS hsc_env)
1865 return $! lookupType (hsc_dflags hsc_env)
1866 (hsc_HPT hsc_env) (eps_PTE eps) name
1869 modInfoModBreaks = minf_modBreaks
1872 isDictonaryId :: Id -> Bool
1874 = case tcSplitSigmaTy (idType id) of { (tvs, theta, tau) -> isDictTy tau }
1876 -- | Looks up a global name: that is, any top-level name in any
1877 -- visible module. Unlike 'lookupName', lookupGlobalName does not use
1878 -- the interactive context, and therefore does not require a preceding
1880 lookupGlobalName :: Session -> Name -> IO (Maybe TyThing)
1881 lookupGlobalName s name = withSession s $ \hsc_env -> do
1882 eps <- readIORef (hsc_EPS hsc_env)
1883 return $! lookupType (hsc_dflags hsc_env)
1884 (hsc_HPT hsc_env) (eps_PTE eps) name
1886 -- -----------------------------------------------------------------------------
1887 -- Misc exported utils
1889 dataConType :: DataCon -> Type
1890 dataConType dc = idType (dataConWrapId dc)
1892 -- | print a 'NamedThing', adding parentheses if the name is an operator.
1893 pprParenSymName :: NamedThing a => a -> SDoc
1894 pprParenSymName a = parenSymOcc (getOccName a) (ppr (getName a))
1896 -- ----------------------------------------------------------------------------
1901 -- - Data and Typeable instances for HsSyn.
1903 -- ToDo: check for small transformations that happen to the syntax in
1904 -- the typechecker (eg. -e ==> negate e, perhaps for fromIntegral)
1906 -- ToDo: maybe use TH syntax instead of IfaceSyn? There's already a way
1907 -- to get from TyCons, Ids etc. to TH syntax (reify).
1909 -- :browse will use either lm_toplev or inspect lm_interface, depending
1910 -- on whether the module is interpreted or not.
1912 -- This is for reconstructing refactored source code
1913 -- Calls the lexer repeatedly.
1914 -- ToDo: add comment tokens to token stream
1915 getTokenStream :: Session -> Module -> IO [Located Token]
1918 -- -----------------------------------------------------------------------------
1919 -- Interactive evaluation
1921 -- | Takes a 'ModuleName' and possibly a 'PackageId', and consults the
1922 -- filesystem and package database to find the corresponding 'Module',
1923 -- using the algorithm that is used for an @import@ declaration.
1924 findModule :: Session -> ModuleName -> Maybe PackageId -> IO Module
1925 findModule s mod_name maybe_pkg = withSession s $ \hsc_env ->
1926 findModule' hsc_env mod_name maybe_pkg
1928 findModule' hsc_env mod_name maybe_pkg =
1930 dflags = hsc_dflags hsc_env
1931 hpt = hsc_HPT hsc_env
1932 this_pkg = thisPackage dflags
1934 case lookupUFM hpt mod_name of
1935 Just mod_info -> return (mi_module (hm_iface mod_info))
1936 _not_a_home_module -> do
1937 res <- findImportedModule hsc_env mod_name maybe_pkg
1939 Found _ m | modulePackageId m /= this_pkg -> return m
1940 | otherwise -> throwDyn (CmdLineError (showSDoc $
1941 text "module" <+> pprModule m <+>
1942 text "is not loaded"))
1943 err -> let msg = cannotFindModule dflags mod_name err in
1944 throwDyn (CmdLineError (showSDoc msg))
1948 -- | Set the interactive evaluation context.
1950 -- Setting the context doesn't throw away any bindings; the bindings
1951 -- we've built up in the InteractiveContext simply move to the new
1952 -- module. They always shadow anything in scope in the current context.
1953 setContext :: Session
1954 -> [Module] -- entire top level scope of these modules
1955 -> [Module] -- exports only of these modules
1957 setContext sess@(Session ref) toplev_mods export_mods = do
1958 hsc_env <- readIORef ref
1959 let old_ic = hsc_IC hsc_env
1960 hpt = hsc_HPT hsc_env
1962 export_env <- mkExportEnv hsc_env export_mods
1963 toplev_envs <- mapM (mkTopLevEnv hpt) toplev_mods
1964 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
1965 writeIORef ref hsc_env{ hsc_IC = old_ic { ic_toplev_scope = toplev_mods,
1966 ic_exports = export_mods,
1967 ic_rn_gbl_env = all_env }}
1969 -- Make a GlobalRdrEnv based on the exports of the modules only.
1970 mkExportEnv :: HscEnv -> [Module] -> IO GlobalRdrEnv
1971 mkExportEnv hsc_env mods = do
1972 stuff <- mapM (getModuleExports hsc_env) mods
1974 (_msgs, mb_name_sets) = unzip stuff
1975 gres = [ nameSetToGlobalRdrEnv (availsToNameSet avails) (moduleName mod)
1976 | (Just avails, mod) <- zip mb_name_sets mods ]
1978 return $! foldr plusGlobalRdrEnv emptyGlobalRdrEnv gres
1980 nameSetToGlobalRdrEnv :: NameSet -> ModuleName -> GlobalRdrEnv
1981 nameSetToGlobalRdrEnv names mod =
1982 mkGlobalRdrEnv [ GRE { gre_name = name, gre_prov = vanillaProv mod }
1983 | name <- nameSetToList names ]
1985 vanillaProv :: ModuleName -> Provenance
1986 -- We're building a GlobalRdrEnv as if the user imported
1987 -- all the specified modules into the global interactive module
1988 vanillaProv mod_name = Imported [ImpSpec { is_decl = decl, is_item = ImpAll}]
1990 decl = ImpDeclSpec { is_mod = mod_name, is_as = mod_name,
1992 is_dloc = srcLocSpan interactiveSrcLoc }
1994 mkTopLevEnv :: HomePackageTable -> Module -> IO GlobalRdrEnv
1995 mkTopLevEnv hpt modl
1996 = case lookupUFM hpt (moduleName modl) of
1997 Nothing -> throwDyn (ProgramError ("mkTopLevEnv: not a home module " ++
1998 showSDoc (ppr modl)))
2000 case mi_globals (hm_iface details) of
2002 throwDyn (ProgramError ("mkTopLevEnv: not interpreted "
2003 ++ showSDoc (ppr modl)))
2004 Just env -> return env
2006 -- | Get the interactive evaluation context, consisting of a pair of the
2007 -- set of modules from which we take the full top-level scope, and the set
2008 -- of modules from which we take just the exports respectively.
2009 getContext :: Session -> IO ([Module],[Module])
2010 getContext s = withSession s (\HscEnv{ hsc_IC=ic } ->
2011 return (ic_toplev_scope ic, ic_exports ic))
2013 -- | Returns 'True' if the specified module is interpreted, and hence has
2014 -- its full top-level scope available.
2015 moduleIsInterpreted :: Session -> Module -> IO Bool
2016 moduleIsInterpreted s modl = withSession s $ \h ->
2017 if modulePackageId modl /= thisPackage (hsc_dflags h)
2019 else case lookupUFM (hsc_HPT h) (moduleName modl) of
2020 Just details -> return (isJust (mi_globals (hm_iface details)))
2021 _not_a_home_module -> return False
2023 -- | Looks up an identifier in the current interactive context (for :info)
2024 getInfo :: Session -> Name -> IO (Maybe (TyThing,Fixity,[Instance]))
2025 getInfo s name = withSession s $ \hsc_env -> tcRnGetInfo hsc_env name
2027 -- | Returns all names in scope in the current interactive context
2028 getNamesInScope :: Session -> IO [Name]
2029 getNamesInScope s = withSession s $ \hsc_env -> do
2030 return (map gre_name (globalRdrEnvElts (ic_rn_gbl_env (hsc_IC hsc_env))))
2032 getRdrNamesInScope :: Session -> IO [RdrName]
2033 getRdrNamesInScope s = withSession s $ \hsc_env -> do
2034 let env = ic_rn_gbl_env (hsc_IC hsc_env)
2035 return (concat (map greToRdrNames (globalRdrEnvElts env)))
2037 -- ToDo: move to RdrName
2038 greToRdrNames :: GlobalRdrElt -> [RdrName]
2039 greToRdrNames GRE{ gre_name = name, gre_prov = prov }
2041 LocalDef -> [unqual]
2042 Imported specs -> concat (map do_spec (map is_decl specs))
2044 occ = nameOccName name
2047 | is_qual decl_spec = [qual]
2048 | otherwise = [unqual,qual]
2049 where qual = Qual (is_as decl_spec) occ
2051 -- | Parses a string as an identifier, and returns the list of 'Name's that
2052 -- the identifier can refer to in the current interactive context.
2053 parseName :: Session -> String -> IO [Name]
2054 parseName s str = withSession s $ \hsc_env -> do
2055 maybe_rdr_name <- hscParseIdentifier (hsc_dflags hsc_env) str
2056 case maybe_rdr_name of
2057 Nothing -> return []
2058 Just (L _ rdr_name) -> do
2059 mb_names <- tcRnLookupRdrName hsc_env rdr_name
2061 Nothing -> return []
2062 Just ns -> return ns
2063 -- ToDo: should return error messages
2065 -- | Returns the 'TyThing' for a 'Name'. The 'Name' may refer to any
2066 -- entity known to GHC, including 'Name's defined using 'runStmt'.
2067 lookupName :: Session -> Name -> IO (Maybe TyThing)
2068 lookupName s name = withSession s $ \hsc_env -> tcRnLookupName hsc_env name
2070 -- -----------------------------------------------------------------------------
2071 -- Getting the type of an expression
2073 -- | Get the type of an expression
2074 exprType :: Session -> String -> IO (Maybe Type)
2075 exprType s expr = withSession s $ \hsc_env -> do
2076 maybe_stuff <- hscTcExpr hsc_env expr
2078 Nothing -> return Nothing
2079 Just ty -> return (Just tidy_ty)
2081 tidy_ty = tidyType emptyTidyEnv ty
2083 -- -----------------------------------------------------------------------------
2084 -- Getting the kind of a type
2086 -- | Get the kind of a type
2087 typeKind :: Session -> String -> IO (Maybe Kind)
2088 typeKind s str = withSession s $ \hsc_env -> do
2089 maybe_stuff <- hscKcType hsc_env str
2091 Nothing -> return Nothing
2092 Just kind -> return (Just kind)
2094 -----------------------------------------------------------------------------
2095 -- cmCompileExpr: compile an expression and deliver an HValue
2097 compileExpr :: Session -> String -> IO (Maybe HValue)
2098 compileExpr s expr = withSession s $ \hsc_env -> do
2099 maybe_stuff <- hscStmt hsc_env ("let __cmCompileExpr = "++expr)
2101 Nothing -> return Nothing
2102 Just (new_ic, names, hval) -> do
2104 hvals <- (unsafeCoerce# hval) :: IO [HValue]
2106 case (names,hvals) of
2107 ([n],[hv]) -> return (Just hv)
2108 _ -> panic "compileExpr"
2110 -- -----------------------------------------------------------------------------
2111 -- Compile an expression into a dynamic
2113 dynCompileExpr :: Session -> String -> IO (Maybe Dynamic)
2114 dynCompileExpr ses expr = do
2115 (full,exports) <- getContext ses
2116 setContext ses full $
2118 (stringToPackageId "base") (mkModuleName "Data.Dynamic")
2120 let stmt = "let __dynCompileExpr = Data.Dynamic.toDyn (" ++ expr ++ ")"
2121 res <- withSession ses (flip hscStmt stmt)
2122 setContext ses full exports
2124 Nothing -> return Nothing
2125 Just (_, names, hvals) -> do
2126 vals <- (unsafeCoerce# hvals :: IO [Dynamic])
2127 case (names,vals) of
2128 (_:[], v:[]) -> return (Just v)
2129 _ -> panic "dynCompileExpr"
2131 -- -----------------------------------------------------------------------------
2132 -- running a statement interactively
2135 = RunOk [Name] -- ^ names bound by this evaluation
2136 | RunFailed -- ^ statement failed compilation
2137 | RunException Exception -- ^ statement raised an exception
2138 | RunBreak ThreadId [Name] BreakInfo ResumeHandle
2141 = Break HValue BreakInfo ThreadId ResumeHandle -- ^ the computation hit a breakpoint
2142 | Complete (Either Exception [HValue]) -- ^ the computation completed with either an exception or a value
2144 data ResumeHandle = ResumeHandle (MVar ()) (MVar Status) [Name]
2146 -- | Run a statement in the current interactive context. Statement
2147 -- may bind multple values.
2148 runStmt :: Session -> String -> IO RunResult
2149 runStmt (Session ref) expr
2151 hsc_env <- readIORef ref
2153 breakMVar <- newEmptyMVar -- wait on this when we hit a breakpoint
2154 statusMVar <- newEmptyMVar -- wait on this when a computation is running
2156 -- Turn off -fwarn-unused-bindings when running a statement, to hide
2157 -- warnings about the implicit bindings we introduce.
2158 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
2159 hsc_env' = hsc_env{ hsc_dflags = dflags' }
2161 maybe_stuff <- hscStmt hsc_env' expr
2164 Nothing -> return RunFailed
2165 Just (new_hsc_env, names, hval) -> do
2166 writeIORef ref new_hsc_env
2168 let resume_handle = ResumeHandle breakMVar statusMVar names
2169 -- set the onBreakAction to be performed when we hit a
2170 -- breakpoint this is visible in the Byte Code
2171 -- Interpreter, thus it is a global variable,
2172 -- implemented with stable pointers
2173 stablePtr <- setBreakAction resume_handle
2175 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
2176 status <- sandboxIO statusMVar thing_to_run
2177 freeStablePtr stablePtr -- be careful not to leak stable pointers!
2178 handleRunStatus ref names status
2180 handleRunStatus ref names status =
2182 -- did we hit a breakpoint or did we complete?
2183 (Break apStack info tid res) -> do
2184 hsc_env <- readIORef ref
2185 (new_hsc_env, names) <- extendEnvironment hsc_env apStack
2186 (breakInfo_vars info)
2187 writeIORef ref new_hsc_env
2188 return (RunBreak tid names info res)
2189 (Complete either_hvals) ->
2190 case either_hvals of
2191 Left e -> return (RunException e)
2193 extendLinkEnv (zip names hvals)
2194 return (RunOk names)
2196 -- this points to the IO action that is executed when a breakpoint is hit
2197 foreign import ccall "&breakPointIOAction"
2198 breakPointIOAction :: Ptr (StablePtr (BreakInfo -> HValue -> IO ()))
2200 -- When running a computation, we redirect ^C exceptions to the running
2201 -- thread. ToDo: we might want a way to continue even if the target
2202 -- thread doesn't die when it receives the exception... "this thread
2203 -- is not responding".
2204 sandboxIO :: MVar Status -> IO [HValue] -> IO Status
2205 sandboxIO statusMVar thing = do
2206 ts <- takeMVar interruptTargetThread
2207 child <- forkIO (do res <- Exception.try thing; putMVar statusMVar (Complete res))
2208 putMVar interruptTargetThread (child:ts)
2209 takeMVar statusMVar `finally` modifyMVar_ interruptTargetThread (return.tail)
2211 setBreakAction res@(ResumeHandle breakMVar statusMVar names) = do
2212 stablePtr <- newStablePtr onBreak
2213 poke breakPointIOAction stablePtr
2215 where onBreak ids apStack = do
2217 putMVar statusMVar (Break apStack ids tid res)
2220 resume :: Session -> ResumeHandle -> IO RunResult
2221 resume (Session ref) res@(ResumeHandle breakMVar statusMVar names) = do
2222 stablePtr <- setBreakAction res
2223 putMVar breakMVar ()
2224 status <- takeMVar statusMVar
2225 handleRunStatus ref names status
2228 -- This version of sandboxIO runs the expression in a completely new
2229 -- RTS main thread. It is disabled for now because ^C exceptions
2230 -- won't be delivered to the new thread, instead they'll be delivered
2231 -- to the (blocked) GHCi main thread.
2233 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
2235 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
2236 sandboxIO thing = do
2237 st_thing <- newStablePtr (Exception.try thing)
2238 alloca $ \ p_st_result -> do
2239 stat <- rts_evalStableIO st_thing p_st_result
2240 freeStablePtr st_thing
2242 then do st_result <- peek p_st_result
2243 result <- deRefStablePtr st_result
2244 freeStablePtr st_result
2245 return (Right result)
2247 return (Left (fromIntegral stat))
2249 foreign import "rts_evalStableIO" {- safe -}
2250 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
2251 -- more informative than the C type!
2253 XXX the type of rts_evalStableIO no longer matches the above
2257 -- -----------------------------------------------------------------------------
2258 -- After stopping at a breakpoint, add free variables to the environment
2260 -- Todo: turn this into a primop, and provide special version(s) for unboxed things
2261 foreign import ccall "rts_getApStackVal" getApStackVal :: StablePtr a -> Int -> IO (StablePtr b)
2263 getIdValFromApStack :: a -> (Id, Int) -> IO (Id, HValue)
2264 getIdValFromApStack apStack (identifier, stackDepth) = do
2265 -- ToDo: check the type of the identifer and decide whether it is unboxed or not
2266 apSptr <- newStablePtr apStack
2267 resultSptr <- getApStackVal apSptr (stackDepth - 1)
2268 result <- deRefStablePtr resultSptr
2269 freeStablePtr apSptr
2270 freeStablePtr resultSptr
2271 return (identifier, unsafeCoerce# result)
2273 extendEnvironment :: HscEnv -> a -> [(Id, Int)] -> IO (HscEnv, [Name])
2274 extendEnvironment hsc_env apStack idsOffsets = do
2275 idsVals <- mapM (getIdValFromApStack apStack) idsOffsets
2276 let (ids, hValues) = unzip idsVals
2277 let names = map idName ids
2278 let global_ids = map globaliseAndTidy ids
2279 typed_ids <- mapM instantiateIdType global_ids
2280 let ictxt = hsc_IC hsc_env
2281 rn_env = ic_rn_local_env ictxt
2282 type_env = ic_type_env ictxt
2283 bound_names = map idName typed_ids
2284 new_rn_env = extendLocalRdrEnv rn_env bound_names
2285 -- Remove any shadowed bindings from the type_env;
2286 -- they are inaccessible but might, I suppose, cause
2287 -- a space leak if we leave them there
2288 shadowed = [ n | name <- bound_names,
2289 let rdr_name = mkRdrUnqual (nameOccName name),
2290 Just n <- [lookupLocalRdrEnv rn_env rdr_name] ]
2291 filtered_type_env = delListFromNameEnv type_env shadowed
2292 new_type_env = extendTypeEnvWithIds filtered_type_env (typed_ids)
2293 new_ic = ictxt { ic_rn_local_env = new_rn_env,
2294 ic_type_env = new_type_env }
2295 extendLinkEnv (zip names hValues) -- ToDo: we must remember to restore the old env after we finish a breakpoint
2296 return (hsc_env{hsc_IC = new_ic}, names)
2298 globaliseAndTidy :: Id -> Id
2300 = let tidied_type = tidyTopType$ idType id
2301 in setIdType (globaliseId VanillaGlobal id) tidied_type
2303 -- | Instantiate the tyVars with GHC.Base.Unknown
2304 instantiateIdType :: Id -> IO Id
2305 instantiateIdType id = do
2306 instantiatedType <- instantiateTyVarsToUnknown hsc_env (idType id)
2307 return$ setIdType id instantiatedType
2309 -----------------------------------------------------------------------------
2310 -- show a module and it's source/object filenames
2312 showModule :: Session -> ModSummary -> IO String
2313 showModule s mod_summary = withSession s $ \hsc_env ->
2314 isModuleInterpreted s mod_summary >>= \interpreted ->
2315 return (showModMsg (hscTarget(hsc_dflags hsc_env)) interpreted mod_summary)
2317 isModuleInterpreted :: Session -> ModSummary -> IO Bool
2318 isModuleInterpreted s mod_summary = withSession s $ \hsc_env ->
2319 case lookupUFM (hsc_HPT hsc_env) (ms_mod_name mod_summary) of
2320 Nothing -> panic "missing linkable"
2321 Just mod_info -> return (not obj_linkable)
2323 obj_linkable = isObjectLinkable (expectJust "showModule" (hm_linkable mod_info))
2325 obtainTerm1 :: Session -> Bool -> Maybe Type -> a -> IO Term
2326 obtainTerm1 sess force mb_ty x = withSession sess $ \hsc_env -> cvObtainTerm hsc_env force mb_ty (unsafeCoerce# x)
2328 obtainTerm :: Session -> Bool -> Id -> IO (Maybe Term)
2329 obtainTerm sess force id = withSession sess $ \hsc_env -> do
2330 mb_v <- getHValue (varName id)
2332 Just v -> fmap Just$ cvObtainTerm hsc_env force (Just$ idType id) v
2333 Nothing -> return Nothing