2 % (c) The University of Glasgow, 2002
4 % The Compilation Manager
8 ModSummary, -- Abstract
9 ModuleGraph, -- All the modules from the home package
13 cmInit, -- :: GhciMode -> IO CmState
15 cmDepAnal, -- :: CmState -> [FilePath] -> IO ModuleGraph
17 cmTopSort, -- :: Bool -> ModuleGraph -> [SCC ModSummary]
18 cyclicModuleErr, -- :: [ModSummary] -> String -- Used by DriverMkDepend
20 cmLoadModules, -- :: CmState -> ModuleGraph
21 -- -> IO (CmState, Bool, [String])
23 cmUnload, -- :: CmState -> IO CmState
27 cmModuleIsInterpreted, -- :: CmState -> String -> IO Bool
29 cmSetContext, -- :: CmState -> [String] -> [String] -> IO CmState
30 cmGetContext, -- :: CmState -> IO ([String],[String])
32 cmGetInfo, -- :: CmState -> String -> IO (CmState, [(TyThing,Fixity)])
34 cmBrowseModule, -- :: CmState -> IO [TyThing]
38 cmRunStmt, -- :: CmState -> String -> IO (CmState, CmRunResult)
40 cmTypeOfExpr, -- :: CmState -> String -> IO (CmState, Maybe String)
41 cmKindOfType, -- :: CmState -> String -> IO (CmState, Maybe String)
42 cmTypeOfName, -- :: CmState -> Name -> IO (Maybe String)
45 cmCompileExpr, -- :: CmState -> String -> IO (CmState, Maybe HValue)
46 cmGetModuleGraph, -- :: CmState -> ModuleGraph
50 cmGetBindings, -- :: CmState -> [TyThing]
51 cmGetPrintUnqual, -- :: CmState -> PrintUnqualified
56 #include "HsVersions.h"
58 import Packages ( isHomePackage )
59 import DriverPipeline ( CompResult(..), preprocess, compile, link )
60 import HscMain ( newHscEnv )
61 import DriverState ( v_Output_file, v_NoHsMain, v_MainModIs )
62 import DriverPhases ( HscSource(..), isHsBoot, hscSourceString, isHaskellSrcFilename )
63 import Finder ( findModule, findLinkable, addHomeModuleToFinder,
64 flushFinderCache, findPackageModule,
65 mkHomeModLocation, FindResult(..), cantFindError )
66 import HscTypes ( ModSummary(..), HomeModInfo(..), ModIface(..), msHsFilePath,
67 HscEnv(..), GhciMode(..),
68 InteractiveContext(..), emptyInteractiveContext,
69 HomePackageTable, emptyHomePackageTable, IsBootInterface,
70 Linkable(..), isObjectLinkable )
71 import Module ( Module, mkModule, delModuleEnv, delModuleEnvList, mkModuleEnv,
72 lookupModuleEnv, moduleEnvElts, extendModuleEnv, filterModuleEnv,
73 moduleUserString, addBootSuffixLocn,
75 import GetImports ( getImports )
76 import Digraph ( SCC(..), stronglyConnComp, flattenSCC, flattenSCCs )
77 import ErrUtils ( showPass )
78 import SysTools ( cleanTempFilesExcept )
79 import BasicTypes ( SuccessFlag(..), succeeded )
80 import StringBuffer ( hGetStringBuffer )
81 import Type ( dropForAlls )
85 import CmdLineOpts ( DynFlags(..), dopt )
86 import Maybes ( expectJust, orElse, mapCatMaybes )
89 import DATA_IOREF ( readIORef )
92 import HscMain ( hscGetInfo, GetInfoResult, hscStmt, hscTcExpr, hscKcType )
93 import HscTypes ( TyThing(..), icPrintUnqual, showModMsg )
94 import TcRnDriver ( mkExportEnv, getModuleContents )
95 import IfaceSyn ( IfaceDecl )
96 import RdrName ( GlobalRdrEnv, plusGlobalRdrEnv )
100 import Type ( tidyType )
101 import VarEnv ( emptyTidyEnv )
102 import Linker ( HValue, unload, extendLinkEnv )
103 import GHC.Exts ( unsafeCoerce# )
105 import Control.Exception as Exception ( Exception, try )
106 import CmdLineOpts ( DynFlag(..), dopt_unset )
109 import EXCEPTION ( throwDyn )
112 import Directory ( getModificationTime, doesFileExist )
120 %************************************************************************
122 The module dependency graph
123 ModSummary, ModGraph, NodeKey, NodeMap
125 %************************************************************************
127 The nodes of the module graph are
128 EITHER a regular Haskell source module
129 OR a hi-boot source module
131 A ModuleGraph contains all the nodes from the home package (only).
132 There will be a node for each source module, plus a node for each hi-boot
136 type ModuleGraph = [ModSummary] -- The module graph,
137 -- NOT NECESSARILY IN TOPOLOGICAL ORDER
139 emptyMG :: ModuleGraph
143 ms_allimps :: ModSummary -> [Module]
144 ms_allimps ms = ms_srcimps ms ++ ms_imps ms
147 type NodeKey = (Module, HscSource) -- The nodes of the graph are
148 type NodeMap a = FiniteMap NodeKey a -- keyed by (mod, src_file_type) pairs
150 msKey :: ModSummary -> NodeKey
151 msKey (ModSummary { ms_mod = mod, ms_hsc_src = boot }) = (mod,boot)
153 emptyNodeMap :: NodeMap a
154 emptyNodeMap = emptyFM
156 mkNodeMap :: [ModSummary] -> NodeMap ModSummary
157 mkNodeMap summaries = listToFM [ (msKey s, s) | s <- summaries]
159 nodeMapElts :: NodeMap a -> [a]
164 %************************************************************************
166 The compilation manager state
168 %************************************************************************
172 -- Persistent state for the entire system
175 cm_hsc :: HscEnv, -- Includes the home-package table
176 cm_mg :: ModuleGraph, -- The module graph
177 cm_ic :: InteractiveContext -- Command-line binding info
181 cmGetModuleGraph cmstate = cm_mg cmstate
182 cmGetBindings cmstate = nameEnvElts (ic_type_env (cm_ic cmstate))
183 cmGetPrintUnqual cmstate = icPrintUnqual (cm_ic cmstate)
184 cmHPT cmstate = hsc_HPT (cm_hsc cmstate)
187 cmInit :: GhciMode -> DynFlags -> IO CmState
188 cmInit ghci_mode dflags
189 = do { hsc_env <- newHscEnv ghci_mode dflags
190 ; return (CmState { cm_hsc = hsc_env,
192 cm_ic = emptyInteractiveContext })}
194 discardCMInfo :: CmState -> CmState
195 -- Forget the compilation manager's state, including the home package table
196 -- but retain the persistent info in HscEnv
197 discardCMInfo cm_state
198 = cm_state { cm_mg = emptyMG, cm_ic = emptyInteractiveContext,
199 cm_hsc = (cm_hsc cm_state) { hsc_HPT = emptyHomePackageTable } }
201 -------------------------------------------------------------------
202 -- The unlinked image
204 -- The compilation manager keeps a list of compiled, but as-yet unlinked
205 -- binaries (byte code or object code). Even when it links bytecode
206 -- it keeps the unlinked version so it can re-link it later without
209 type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
211 findModuleLinkable_maybe :: [Linkable] -> Module -> Maybe Linkable
212 findModuleLinkable_maybe lis mod
213 = case [LM time nm us | LM time nm us <- lis, nm == mod] of
216 many -> pprPanic "findModuleLinkable" (ppr mod)
218 delModuleLinkable :: [Linkable] -> Module -> [Linkable]
219 delModuleLinkable ls mod = [ l | l@(LM _ nm _) <- ls, nm /= mod ]
223 %************************************************************************
227 %************************************************************************
231 -----------------------------------------------------------------------------
232 -- Setting the context doesn't throw away any bindings; the bindings
233 -- we've built up in the InteractiveContext simply move to the new
234 -- module. They always shadow anything in scope in the current context.
238 -> [String] -- take the top-level scopes of these modules
239 -> [String] -- and the just the exports from these
241 cmSetContext cmstate toplevs exports = do
242 let old_ic = cm_ic cmstate
243 hsc_env = cm_hsc cmstate
244 hpt = hsc_HPT hsc_env
246 let export_mods = map mkModule exports
247 mapM_ (checkModuleExists (hsc_dflags hsc_env) hpt) export_mods
248 export_env <- mkExportEnv hsc_env export_mods
249 toplev_envs <- mapM (mkTopLevEnv hpt) toplevs
251 let all_env = foldr plusGlobalRdrEnv export_env toplev_envs
252 return cmstate{ cm_ic = old_ic { ic_toplev_scope = toplevs,
253 ic_exports = exports,
254 ic_rn_gbl_env = all_env } }
256 checkModuleExists :: DynFlags -> HomePackageTable -> Module -> IO ()
257 checkModuleExists dflags hpt mod =
258 case lookupModuleEnv hpt mod of
259 Just mod_info -> return ()
260 _not_a_home_module -> do
261 res <- findPackageModule dflags mod True
263 Found _ _ -> return ()
264 err -> let msg = cantFindError dflags mod err in
265 throwDyn (CmdLineError (showSDoc msg))
267 mkTopLevEnv :: HomePackageTable -> String -> IO GlobalRdrEnv
269 = case lookupModuleEnv hpt (mkModule mod) of
270 Nothing -> throwDyn (ProgramError ("mkTopLevEnv: not a home module " ++ mod))
271 Just details -> case mi_globals (hm_iface details) of
272 Nothing -> throwDyn (ProgramError ("mkTopLevEnv: not interpreted " ++ mod))
273 Just env -> return env
275 cmGetContext :: CmState -> IO ([String],[String])
276 cmGetContext CmState{cm_ic=ic} =
277 return (ic_toplev_scope ic, ic_exports ic)
279 cmModuleIsInterpreted :: CmState -> String -> IO Bool
280 cmModuleIsInterpreted cmstate str
281 = case lookupModuleEnv (cmHPT cmstate) (mkModule str) of
282 Just details -> return (isJust (mi_globals (hm_iface details)))
283 _not_a_home_module -> return False
285 -----------------------------------------------------------------------------
287 cmSetDFlags :: CmState -> DynFlags -> CmState
288 cmSetDFlags cm_state dflags
289 = cm_state { cm_hsc = (cm_hsc cm_state) { hsc_dflags = dflags } }
291 cmGetDFlags :: CmState -> DynFlags
292 cmGetDFlags cm_state = hsc_dflags (cm_hsc cm_state)
294 -----------------------------------------------------------------------------
295 -- cmInfoThing: convert a String to a TyThing
297 -- A string may refer to more than one TyThing (eg. a constructor,
298 -- and type constructor), so we return a list of all the possible TyThings.
300 cmGetInfo :: CmState -> String -> IO [GetInfoResult]
301 cmGetInfo cmstate id = hscGetInfo (cm_hsc cmstate) (cm_ic cmstate) id
303 -- ---------------------------------------------------------------------------
304 -- cmBrowseModule: get all the TyThings defined in a module
306 cmBrowseModule :: CmState -> String -> Bool -> IO [IfaceDecl]
307 cmBrowseModule cmstate str exports_only
308 = do { mb_decls <- getModuleContents (cm_hsc cmstate) (cm_ic cmstate)
309 (mkModule str) exports_only
311 Nothing -> return [] -- An error of some kind
316 -----------------------------------------------------------------------------
317 cmShowModule :: CmState -> ModSummary -> String
318 cmShowModule cmstate mod_summary
319 = case lookupModuleEnv hpt (ms_mod mod_summary) of
320 Nothing -> panic "missing linkable"
321 Just mod_info -> showModMsg obj_linkable mod_summary
323 obj_linkable = isObjectLinkable (hm_linkable mod_info)
325 hpt = hsc_HPT (cm_hsc cmstate)
327 -----------------------------------------------------------------------------
328 -- cmRunStmt: Run a statement/expr.
331 = CmRunOk [Name] -- names bound by this evaluation
333 | CmRunException Exception -- statement raised an exception
335 cmRunStmt :: CmState -> String -> IO (CmState, CmRunResult)
336 cmRunStmt cmstate@CmState{ cm_hsc=hsc_env, cm_ic=icontext } expr
338 -- Turn off -fwarn-unused-bindings when running a statement, to hide
339 -- warnings about the implicit bindings we introduce.
340 let dflags' = dopt_unset (hsc_dflags hsc_env) Opt_WarnUnusedBinds
341 hsc_env' = hsc_env{ hsc_dflags = dflags' }
343 maybe_stuff <- hscStmt hsc_env' icontext expr
346 Nothing -> return (cmstate, CmRunFailed)
347 Just (new_ic, names, hval) -> do
349 let thing_to_run = unsafeCoerce# hval :: IO [HValue]
350 either_hvals <- sandboxIO thing_to_run
354 -- on error, keep the *old* interactive context,
355 -- so that 'it' is not bound to something
356 -- that doesn't exist.
357 return ( cmstate, CmRunException e )
360 -- Get the newly bound things, and bind them.
361 -- Don't need to delete any shadowed bindings;
362 -- the new ones override the old ones.
363 extendLinkEnv (zip names hvals)
365 return (cmstate{ cm_ic=new_ic },
369 -- We run the statement in a "sandbox" to protect the rest of the
370 -- system from anything the expression might do. For now, this
371 -- consists of just wrapping it in an exception handler, but see below
372 -- for another version.
374 sandboxIO :: IO a -> IO (Either Exception a)
375 sandboxIO thing = Exception.try thing
378 -- This version of sandboxIO runs the expression in a completely new
379 -- RTS main thread. It is disabled for now because ^C exceptions
380 -- won't be delivered to the new thread, instead they'll be delivered
381 -- to the (blocked) GHCi main thread.
383 -- SLPJ: when re-enabling this, reflect a wrong-stat error as an exception
385 sandboxIO :: IO a -> IO (Either Int (Either Exception a))
387 st_thing <- newStablePtr (Exception.try thing)
388 alloca $ \ p_st_result -> do
389 stat <- rts_evalStableIO st_thing p_st_result
390 freeStablePtr st_thing
392 then do st_result <- peek p_st_result
393 result <- deRefStablePtr st_result
394 freeStablePtr st_result
395 return (Right result)
397 return (Left (fromIntegral stat))
399 foreign import "rts_evalStableIO" {- safe -}
400 rts_evalStableIO :: StablePtr (IO a) -> Ptr (StablePtr a) -> IO CInt
401 -- more informative than the C type!
404 -----------------------------------------------------------------------------
405 -- cmTypeOfExpr: returns a string representing the type of an expression
407 cmTypeOfExpr :: CmState -> String -> IO (Maybe String)
408 cmTypeOfExpr cmstate expr
409 = do maybe_stuff <- hscTcExpr (cm_hsc cmstate) (cm_ic cmstate) expr
412 Nothing -> return Nothing
413 Just ty -> return (Just (showSDocForUser unqual doc))
415 doc = text expr <+> dcolon <+> ppr final_ty
416 unqual = icPrintUnqual (cm_ic cmstate)
417 tidy_ty = tidyType emptyTidyEnv ty
418 dflags = hsc_dflags (cm_hsc cmstate)
419 -- if -fglasgow-exts is on we show the foralls, otherwise
422 | dopt Opt_GlasgowExts dflags = tidy_ty
423 | otherwise = dropForAlls tidy_ty
425 -----------------------------------------------------------------------------
426 -- cmKindOfType: returns a string representing the kind of a type
428 cmKindOfType :: CmState -> String -> IO (Maybe String)
429 cmKindOfType cmstate str
430 = do maybe_stuff <- hscKcType (cm_hsc cmstate) (cm_ic cmstate) str
432 Nothing -> return Nothing
433 Just kind -> return (Just res_str)
435 res_str = showSDocForUser unqual (text str <+> dcolon <+> ppr kind)
436 unqual = icPrintUnqual (cm_ic cmstate)
438 -----------------------------------------------------------------------------
439 -- cmTypeOfName: returns a string representing the type of a name.
441 cmTypeOfName :: CmState -> Name -> IO (Maybe String)
442 cmTypeOfName CmState{ cm_ic=ic } name
444 hPutStrLn stderr ("cmTypeOfName: " ++ showSDoc (ppr name))
445 case lookupNameEnv (ic_type_env ic) name of
446 Nothing -> return Nothing
447 Just (AnId id) -> return (Just str)
449 unqual = icPrintUnqual ic
450 ty = tidyType emptyTidyEnv (idType id)
451 str = showSDocForUser unqual (ppr ty)
453 _ -> panic "cmTypeOfName"
455 -----------------------------------------------------------------------------
456 -- cmCompileExpr: compile an expression and deliver an HValue
458 cmCompileExpr :: CmState -> String -> IO (Maybe HValue)
459 cmCompileExpr cmstate expr
462 <- hscStmt (cm_hsc cmstate) (cm_ic cmstate)
463 ("let __cmCompileExpr = "++expr)
466 Nothing -> return Nothing
467 Just (new_ic, names, hval) -> do
470 hvals <- (unsafeCoerce# hval) :: IO [HValue]
472 case (names,hvals) of
473 ([n],[hv]) -> return (Just hv)
474 _ -> panic "cmCompileExpr"
480 %************************************************************************
482 Loading and unloading
484 %************************************************************************
487 -----------------------------------------------------------------------------
488 -- Unload the compilation manager's state: everything it knows about the
489 -- current collection of modules in the Home package.
491 cmUnload :: CmState -> IO CmState
492 cmUnload state@CmState{ cm_hsc = hsc_env }
493 = do -- Throw away the old home dir cache
496 -- Unload everything the linker knows about
499 -- Start with a fresh CmState, but keep the PersistentCompilerState
500 return (discardCMInfo state)
502 cm_unload hsc_env stable_linkables -- Unload everthing *except* 'stable_linkables'
503 = case hsc_mode hsc_env of
506 Interactive -> Linker.unload (hsc_dflags hsc_env) stable_linkables
508 Interactive -> panic "cm_unload: no interpreter"
510 other -> panic "cm_unload: strange mode"
513 -----------------------------------------------------------------------------
514 -- Trace dependency graph
516 -- This is a seperate pass so that the caller can back off and keep
517 -- the current state if the downsweep fails. Typically the caller
518 -- might go cmDepAnal
521 -- He wants to do the dependency analysis before the unload, so that
522 -- if the former fails he can use the later
524 cmDepAnal :: CmState -> [FilePath] -> IO ModuleGraph
525 cmDepAnal cmstate rootnames
526 = do showPass dflags "Chasing dependencies"
527 when (verbosity dflags >= 1 && gmode == Batch) $
528 hPutStrLn stderr (showSDoc (hcat [
529 text "Chasing modules from: ",
530 hcat (punctuate comma (map text rootnames))]))
531 cmDownsweep dflags rootnames (cm_mg cmstate) []
533 hsc_env = cm_hsc cmstate
534 dflags = hsc_dflags hsc_env
535 gmode = hsc_mode hsc_env
537 -----------------------------------------------------------------------------
538 -- The real business of the compilation manager: given a system state and
539 -- a module name, try and bring the module up to date, probably changing
540 -- the system state at the same time.
542 cmLoadModules :: CmState -- The HPT may not be as up to date
543 -> ModuleGraph -- Bang up to date; but may contain hi-boot no
544 -> IO (CmState, -- new state
545 SuccessFlag, -- was successful
546 [String]) -- list of modules loaded
548 cmLoadModules cmstate1 mg2unsorted
549 = do -- version 1's are the original, before downsweep
550 let hsc_env = cm_hsc cmstate1
551 let hpt1 = hsc_HPT hsc_env
552 let ghci_mode = hsc_mode hsc_env -- this never changes
553 let dflags = hsc_dflags hsc_env -- this never changes
555 -- Do the downsweep to reestablish the module graph
556 let verb = verbosity dflags
558 -- Find out if we have a Main module
559 mb_main_mod <- readIORef v_MainModIs
561 main_mod = mb_main_mod `orElse` "Main"
563 = any ((==main_mod).moduleUserString.ms_mod)
566 let mg2unsorted_names = map ms_mod mg2unsorted
568 -- mg2 should be cycle free; but it includes hi-boot ModSummary nodes
569 let mg2 :: [SCC ModSummary]
570 mg2 = cmTopSort False mg2unsorted
572 -- mg2_with_srcimps drops the hi-boot nodes, returning a
573 -- graph with cycles. Among other things, it is used for
574 -- backing out partially complete cycles following a failed
575 -- upsweep, and for removing from hpt all the modules
576 -- not in strict downwards closure, during calls to compile.
577 let mg2_with_srcimps :: [SCC ModSummary]
578 mg2_with_srcimps = cmTopSort True mg2unsorted
580 -- Sort out which linkables we wish to keep in the unlinked image.
581 -- See getValidLinkables below for details.
582 (valid_old_linkables, new_linkables)
583 <- getValidLinkables ghci_mode (hptLinkables hpt1)
584 mg2unsorted_names mg2_with_srcimps
586 -- putStrLn (showSDoc (vcat [ppr valid_old_linkables, ppr new_linkables]))
588 -- The new_linkables are .o files we found on the disk, presumably
589 -- as a result of a GHC run "on the side". So we'd better forget
590 -- everything we know abouut those modules!
591 let old_hpt = delModuleEnvList hpt1 (map linkableModule new_linkables)
593 -- When (verb >= 2) $
594 -- putStrLn (showSDoc (text "Valid linkables:"
595 -- <+> ppr valid_linkables))
597 -- Figure out a stable set of modules which can be retained
598 -- the top level envs, to avoid upsweeping them. Goes to a
599 -- bit of trouble to avoid upsweeping module cycles.
601 -- Construct a set S of stable modules like this:
602 -- Travel upwards, over the sccified graph. For each scc
603 -- of modules ms, add ms to S only if:
604 -- 1. All home imports of ms are either in ms or S
605 -- 2. A valid old linkable exists for each module in ms
607 -- mg2_with_srcimps has no hi-boot nodes,
608 -- and hence neither does stable_mods
609 stable_summaries <- preUpsweep valid_old_linkables
610 mg2unsorted_names [] mg2_with_srcimps
611 let stable_mods = map ms_mod stable_summaries
612 stable_linkables = filter (\m -> linkableModule m `elem` stable_mods)
615 stable_hpt = filterModuleEnv is_stable_hm hpt1
616 is_stable_hm hm_info = mi_module (hm_iface hm_info) `elem` stable_mods
619 = filter (\scc -> any (`notElem` stable_mods)
620 (map ms_mod (flattenSCC scc)))
624 hPutStrLn stderr (showSDoc (text "Stable modules:"
625 <+> sep (map (text.moduleUserString) stable_mods)))
627 -- Unload any modules which are going to be re-linked this time around.
628 cm_unload hsc_env stable_linkables
630 -- We can now glom together our linkable sets
631 let valid_linkables = valid_old_linkables ++ new_linkables
633 -- We could at this point detect cycles which aren't broken by
634 -- a source-import, and complain immediately, but it seems better
635 -- to let upsweep_mods do this, so at least some useful work gets
636 -- done before the upsweep is abandoned.
637 --hPutStrLn stderr "after tsort:\n"
638 --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
640 -- Because we don't take into account source imports when doing
641 -- the topological sort, there shouldn't be any cycles in mg2.
642 -- If there is, we complain and give up -- the user needs to
643 -- break the cycle using a boot file.
645 -- Now do the upsweep, calling compile for each module in
646 -- turn. Final result is version 3 of everything.
648 -- clean up between compilations
649 let cleanup = cleanTempFilesExcept dflags
650 (ppFilesFromSummaries (flattenSCCs mg2))
652 (upsweep_ok, hsc_env3, modsUpswept)
653 <- upsweep_mods (hsc_env { hsc_HPT = stable_hpt })
654 (old_hpt, valid_linkables)
655 cleanup upsweep_these
657 -- At this point, modsUpswept and newLis should have the same
658 -- length, so there is one new (or old) linkable for each
659 -- mod which was processed (passed to compile).
661 -- Make modsDone be the summaries for each home module now
662 -- available; this should equal the domain of hpt3.
663 -- (NOT STRICTLY TRUE if an interactive session was started
664 -- with some object on disk ???)
665 -- Get in in a roughly top .. bottom order (hence reverse).
667 let modsDone = reverse modsUpswept ++ stable_summaries
669 -- Try and do linking in some form, depending on whether the
670 -- upsweep was completely or only partially successful.
672 if succeeded upsweep_ok
675 -- Easy; just relink it all.
676 do when (verb >= 2) $
677 hPutStrLn stderr "Upsweep completely successful."
679 -- clean up after ourselves
680 cleanTempFilesExcept dflags (ppFilesFromSummaries modsDone)
682 ofile <- readIORef v_Output_file
683 no_hs_main <- readIORef v_NoHsMain
685 -- Issue a warning for the confusing case where the user
686 -- said '-o foo' but we're not going to do any linking.
687 -- We attempt linking if either (a) one of the modules is
688 -- called Main, or (b) the user said -no-hs-main, indicating
689 -- that main() is going to come from somewhere else.
691 let do_linking = a_root_is_Main || no_hs_main
692 when (ghci_mode == Batch && isJust ofile && not do_linking
694 hPutStrLn stderr ("Warning: output was redirected with -o, but no output will be generated\nbecause there is no " ++ main_mod ++ " module.")
696 -- link everything together
697 linkresult <- link ghci_mode dflags do_linking (hsc_HPT hsc_env3)
699 let cmstate3 = cmstate1 { cm_mg = modsDone, cm_hsc = hsc_env3 }
700 cmLoadFinish Succeeded linkresult cmstate3
703 -- Tricky. We need to back out the effects of compiling any
704 -- half-done cycles, both so as to clean up the top level envs
705 -- and to avoid telling the interactive linker to link them.
706 do when (verb >= 2) $
707 hPutStrLn stderr "Upsweep partially successful."
710 = map ms_mod modsDone
711 let mods_to_zap_names
712 = findPartiallyCompletedCycles modsDone_names
715 = filter ((`notElem` mods_to_zap_names).ms_mod)
718 let hpt4 = retainInTopLevelEnvs (map ms_mod mods_to_keep)
721 -- Clean up after ourselves
722 cleanTempFilesExcept dflags (ppFilesFromSummaries mods_to_keep)
724 -- Link everything together
725 linkresult <- link ghci_mode dflags False hpt4
727 let cmstate3 = cmstate1 { cm_mg = mods_to_keep,
728 cm_hsc = hsc_env3 { hsc_HPT = hpt4 } }
729 cmLoadFinish Failed linkresult cmstate3
732 -- Finish up after a cmLoad.
734 -- If the link failed, unload everything and return.
735 cmLoadFinish ok Failed cmstate
736 = do cm_unload (cm_hsc cmstate) []
737 return (discardCMInfo cmstate, Failed, [])
739 -- Empty the interactive context and set the module context to the topmost
740 -- newly loaded module, or the Prelude if none were loaded.
741 cmLoadFinish ok Succeeded cmstate
742 = do let new_cmstate = cmstate { cm_ic = emptyInteractiveContext }
743 mods_loaded = map (moduleUserString.ms_mod)
746 return (new_cmstate, ok, mods_loaded)
748 -- used to fish out the preprocess output files for the purposes of
749 -- cleaning up. The preprocessed file *might* be the same as the
750 -- source file, but that doesn't do any harm.
751 ppFilesFromSummaries summaries = [ fn | Just fn <- map ms_hspp_file summaries ]
753 -----------------------------------------------------------------------------
756 -- For each module (or SCC of modules), we take:
758 -- - an on-disk linkable, if this is the first time around and one
761 -- - the old linkable, otherwise (and if one is available).
763 -- and we throw away the linkable if it is older than the source file.
764 -- In interactive mode, we also ignore the on-disk linkables unless
765 -- all of the dependents of this SCC also have on-disk linkables (we
766 -- can't have dynamically loaded objects that depend on interpreted
769 -- If a module has a valid linkable, then it may be STABLE (see below),
770 -- and it is classified as SOURCE UNCHANGED for the purposes of calling
773 -- ToDo: this pass could be merged with the preUpsweep.
777 -> [Linkable] -- old linkables
778 -> [Module] -- all home modules
779 -> [SCC ModSummary] -- all modules in the program, dependency order
780 -> IO ( [Linkable], -- still-valid linkables
781 [Linkable] -- new linkables we just found on the disk
782 -- presumably generated by separate run of ghc
785 getValidLinkables mode old_linkables all_home_mods module_graph
786 = do { -- Process the SCCs in bottom-to-top order
787 -- (foldM works left-to-right)
788 ls <- foldM (getValidLinkablesSCC mode old_linkables all_home_mods)
790 ; return (partition_it ls [] []) }
792 partition_it [] valid new = (valid,new)
793 partition_it ((l,b):ls) valid new
794 | b = partition_it ls valid (l:new)
795 | otherwise = partition_it ls (l:valid) new
800 -> [Linkable] -- old linkables
801 -> [Module] -- all home modules
804 -> IO [(Linkable,Bool)]
806 getValidLinkablesSCC mode old_linkables all_home_mods new_linkables scc0
808 scc = flattenSCC scc0
809 scc_names = map ms_mod scc
810 home_module m = m `elem` all_home_mods && m `notElem` scc_names
811 scc_allhomeimps = nub (filter home_module (concatMap ms_imps scc))
812 -- NB. ms_imps, not ms_allimps above. We don't want to
813 -- force a module's SOURCE imports to be already compiled for
814 -- its object linkable to be valid.
816 -- The new_linkables is only the *valid* linkables below here
817 has_object m = case findModuleLinkable_maybe (map fst new_linkables) m of
819 Just l -> isObjectLinkable l
821 objects_allowed = mode == Batch || all has_object scc_allhomeimps
825 <- foldM (getValidLinkable old_linkables objects_allowed) [] scc
827 -- since an scc can contain only all objects or no objects at all,
828 -- we have to check whether we got all objects or not, and re-do
829 -- the linkable check if not.
832 && not (all isObjectLinkable (map fst new_linkables'))
833 then foldM (getValidLinkable old_linkables False) [] scc
834 else return new_linkables'
836 return (new_linkables ++ new_linkables')
839 getValidLinkable :: [Linkable] -> Bool -> [(Linkable,Bool)] -> ModSummary
840 -> IO [(Linkable,Bool)]
841 -- True <=> linkable is new; i.e. freshly discovered on the disk
842 -- presumably generated 'on the side'
843 -- by a separate GHC run
844 getValidLinkable old_linkables objects_allowed new_linkables summary
845 -- 'objects_allowed' says whether we permit this module to
846 -- have a .o-file linkable. We only permit it if all the
847 -- modules it depends on also have .o files; a .o file can't
848 -- link to a bytecode module
849 = do let mod_name = ms_mod summary
852 <- if (not objects_allowed)
855 else findLinkable mod_name (ms_location summary)
857 let old_linkable = findModuleLinkable_maybe old_linkables mod_name
860 case (old_linkable, maybe_disk_linkable) of
861 (Nothing, Nothing) -> []
863 -- new object linkable just appeared
864 (Nothing, Just l) -> up_to_date l True
867 | isObjectLinkable l -> []
868 -- object linkable disappeared! In case we need to
869 -- relink the module, disregard the old linkable and
870 -- just interpret the module from now on.
871 | otherwise -> up_to_date l False
872 -- old byte code linkable
875 | not (isObjectLinkable l) -> up_to_date l False
876 -- if the previous linkable was interpreted, then we
877 -- ignore a newly compiled version, because the version
878 -- numbers in the interface file will be out-of-sync with
879 -- our internal ones.
880 | linkableTime l' > linkableTime l -> up_to_date l' True
881 | linkableTime l' == linkableTime l -> up_to_date l False
883 -- on-disk linkable has been replaced by an older one!
884 -- again, disregard the previous one.
887 | linkableTime l < ms_hs_date summary = []
888 | otherwise = [(l,b)]
889 -- why '<' rather than '<=' above? If the filesystem stores
890 -- times to the nearset second, we may occasionally find that
891 -- the object & source have the same modification time,
892 -- especially if the source was automatically generated
893 -- and compiled. Using >= is slightly unsafe, but it matches
896 return (new_linkables' ++ new_linkables)
899 hptLinkables :: HomePackageTable -> [Linkable]
900 -- Get all the linkables from the home package table, one for each module
901 -- Once the HPT is up to date, these are the ones we should link
902 hptLinkables hpt = map hm_linkable (moduleEnvElts hpt)
905 -----------------------------------------------------------------------------
906 -- Do a pre-upsweep without use of "compile", to establish a
907 -- (downward-closed) set of stable modules for which we won't call compile.
910 -- * has a valid linkable (see getValidLinkables above)
911 -- * depends only on stable modules
912 -- * has an interface in the HPT (interactive mode only)
914 preUpsweep :: [Linkable] -- new valid linkables
915 -> [Module] -- names of all mods encountered in downsweep
916 -> [ModSummary] -- accumulating stable modules
917 -> [SCC ModSummary] -- scc-ified mod graph, including src imps
918 -> IO [ModSummary] -- stable modules
920 preUpsweep valid_lis all_home_mods stable [] = return stable
921 preUpsweep valid_lis all_home_mods stable (scc0:sccs)
922 = do let scc = flattenSCC scc0
923 scc_allhomeimps :: [Module]
925 = nub (filter (`elem` all_home_mods) (concatMap ms_allimps scc))
926 all_imports_in_scc_or_stable
927 = all in_stable_or_scc scc_allhomeimps
928 scc_mods = map ms_mod scc
929 stable_names = scc_mods ++ map ms_mod stable
930 in_stable_or_scc m = m `elem` stable_names
932 -- now we check for valid linkables: each module in the SCC must
933 -- have a valid linkable (see getValidLinkables above).
934 has_valid_linkable scc_mod
935 = isJust (findModuleLinkable_maybe valid_lis scc_mod)
937 scc_is_stable = all_imports_in_scc_or_stable
938 && all has_valid_linkable scc_mods
941 then preUpsweep valid_lis all_home_mods (scc ++ stable) sccs
942 else preUpsweep valid_lis all_home_mods stable sccs
945 -- Return (names of) all those in modsDone who are part of a cycle
946 -- as defined by theGraph.
947 findPartiallyCompletedCycles :: [Module] -> [SCC ModSummary] -> [Module]
948 findPartiallyCompletedCycles modsDone theGraph
952 chew ((AcyclicSCC v):rest) = chew rest -- acyclic? not interesting.
953 chew ((CyclicSCC vs):rest)
954 = let names_in_this_cycle = nub (map ms_mod vs)
956 = nub ([done | done <- modsDone,
957 done `elem` names_in_this_cycle])
958 chewed_rest = chew rest
960 if notNull mods_in_this_cycle
961 && length mods_in_this_cycle < length names_in_this_cycle
962 then mods_in_this_cycle ++ chewed_rest
966 -- Compile multiple modules, stopping as soon as an error appears.
967 -- There better had not be any cyclic groups here -- we check for them.
968 upsweep_mods :: HscEnv -- Includes initially-empty HPT
969 -> (HomePackageTable, [Linkable]) -- HPT and valid linkables from last time round
970 -> IO () -- How to clean up unwanted tmp files
971 -> [SCC ModSummary] -- Mods to do (the worklist)
973 HscEnv, -- With an updated HPT
974 [ModSummary]) -- Mods which succeeded
976 upsweep_mods hsc_env oldUI cleanup
978 = return (Succeeded, hsc_env, [])
980 upsweep_mods hsc_env oldUI cleanup
982 = do hPutStrLn stderr (showSDoc (cyclicModuleErr ms))
983 return (Failed, hsc_env, [])
985 upsweep_mods hsc_env oldUI@(old_hpt, old_linkables) cleanup
986 (AcyclicSCC mod:mods)
987 = do -- putStrLn ("UPSWEEP_MOD: hpt = " ++
988 -- show (map (moduleUserString.moduleName.mi_module.hm_iface)
989 -- (moduleEnvElts (hsc_HPT hsc_env)))
991 mb_mod_info <- upsweep_mod hsc_env oldUI mod
993 cleanup -- Remove unwanted tmp files between compilations
996 Nothing -> return (Failed, hsc_env, [])
998 { let this_mod = ms_mod mod
1000 -- Add new info to hsc_env
1001 hpt1 = extendModuleEnv (hsc_HPT hsc_env) this_mod mod_info
1002 hsc_env1 = hsc_env { hsc_HPT = hpt1 }
1004 -- Space-saving: delete the old HPT entry and linkable for mod
1005 -- BUT if mod is a hs-boot node, don't delete it
1006 -- For the linkable this is dead right: the linkable relates only
1007 -- to the main Haskell source file.
1008 -- For the interface, the HPT entry is probaby for the main Haskell
1009 -- source file. Deleting it would force
1010 oldUI1 | isHsBoot (ms_hsc_src mod) = oldUI
1012 = (delModuleEnv old_hpt this_mod,
1013 delModuleLinkable old_linkables this_mod)
1015 ; (restOK, hsc_env2, modOKs) <- upsweep_mods hsc_env1 oldUI1 cleanup mods
1016 ; return (restOK, hsc_env2, mod:modOKs) }
1019 -- Compile a single module. Always produce a Linkable for it if
1020 -- successful. If no compilation happened, return the old Linkable.
1021 upsweep_mod :: HscEnv
1022 -> (HomePackageTable, UnlinkedImage)
1024 -> IO (Maybe HomeModInfo) -- Nothing => Failed
1026 upsweep_mod hsc_env (old_hpt, old_linkables) summary
1028 let this_mod = ms_mod summary
1030 -- The old interface is ok if it's in the old HPT
1031 -- a) we're compiling a source file, and the old HPT entry is for a source file
1032 -- b) we're compiling a hs-boot file
1033 -- Case (b) allows an hs-boot file to get the interface of its real source file
1034 -- on the second iteration of the compilation manager, but that does no harm.
1035 -- Otherwise the hs-boot file will always be recompiled
1037 = case lookupModuleEnv old_hpt this_mod of
1039 Just hm_info | isHsBoot (ms_hsc_src summary) -> Just iface
1040 | not (mi_boot iface) -> Just iface
1041 | otherwise -> Nothing
1043 iface = hm_iface hm_info
1045 maybe_old_linkable = findModuleLinkable_maybe old_linkables this_mod
1046 source_unchanged = isJust maybe_old_linkable
1048 old_linkable = expectJust "upsweep_mod:old_linkable" maybe_old_linkable
1051 | Just l <- maybe_old_linkable, isObjectLinkable l = True
1054 compresult <- compile hsc_env summary source_unchanged have_object mb_old_iface
1058 -- Compilation "succeeded", and may or may not have returned a new
1059 -- linkable (depending on whether compilation was actually performed
1061 CompOK new_details new_iface maybe_new_linkable
1063 new_linkable = maybe_new_linkable `orElse` old_linkable
1064 new_info = HomeModInfo { hm_iface = new_iface,
1065 hm_details = new_details,
1066 hm_linkable = new_linkable }
1067 return (Just new_info)
1069 -- Compilation failed. Compile may still have updated the PCS, tho.
1070 CompErrs -> return Nothing
1072 -- Filter modules in the HPT
1073 retainInTopLevelEnvs :: [Module] -> HomePackageTable -> HomePackageTable
1074 retainInTopLevelEnvs keep_these hpt
1075 = mkModuleEnv [ (mod, fromJust mb_mod_info)
1077 , let mb_mod_info = lookupModuleEnv hpt mod
1078 , isJust mb_mod_info ]
1080 -----------------------------------------------------------------------------
1081 cmTopSort :: Bool -- Drop hi-boot nodes? (see below)
1084 -- Calculate SCCs of the module graph, possibly dropping the hi-boot nodes
1086 -- Drop hi-boot nodes (first boolean arg)?
1088 -- False: treat the hi-boot summaries as nodes of the graph,
1089 -- so the graph must be acyclic
1091 -- True: eliminate the hi-boot nodes, and instead pretend
1092 -- the a source-import of Foo is an import of Foo
1093 -- The resulting graph has no hi-boot nodes, but can by cyclic
1095 cmTopSort drop_hs_boot_nodes summaries
1096 = stronglyConnComp nodes
1098 -- Drop hs-boot nodes by using HsSrcFile as the key
1099 hs_boot_key | drop_hs_boot_nodes = HsSrcFile
1100 | otherwise = HsBootFile
1102 -- We use integers as the keys for the SCC algorithm
1103 nodes :: [(ModSummary, Int, [Int])]
1104 nodes = [(s, fromJust (lookup_key (ms_hsc_src s) (ms_mod s)),
1105 out_edge_keys hs_boot_key (ms_srcimps s) ++
1106 out_edge_keys HsSrcFile (ms_imps s) )
1108 , not (ms_hsc_src s == HsBootFile && drop_hs_boot_nodes) ]
1109 -- Drop the hi-boot ones if told to do so
1111 key_map :: NodeMap Int
1112 key_map = listToFM ([(ms_mod s, ms_hsc_src s) | s <- summaries]
1115 lookup_key :: HscSource -> Module -> Maybe Int
1116 lookup_key hs_src mod = lookupFM key_map (mod, hs_src)
1118 out_edge_keys :: HscSource -> [Module] -> [Int]
1119 out_edge_keys hi_boot ms = mapCatMaybes (lookup_key hi_boot) ms
1120 -- If we want keep_hi_boot_nodes, then we do lookup_key with
1121 -- the IsBootInterface parameter True; else False
1124 -----------------------------------------------------------------------------
1125 -- Downsweep (dependency analysis)
1127 -- Chase downwards from the specified root set, returning summaries
1128 -- for all home modules encountered. Only follow source-import
1131 -- We pass in the previous collection of summaries, which is used as a
1132 -- cache to avoid recalculating a module summary if the source is
1135 -- The returned list of [ModSummary] nodes has one node for each home-package
1136 -- module. The imports of these nodes are all there, including the imports
1137 -- of non-home-package modules.
1139 cmDownsweep :: DynFlags
1140 -> [FilePath] -- Roots
1141 -> [ModSummary] -- Old summaries
1142 -> [Module] -- Ignore dependencies on these; treat them as
1143 -- if they were package modules
1145 cmDownsweep dflags roots old_summaries excl_mods
1146 = do rootSummaries <- mapM getRootSummary roots
1147 checkDuplicates rootSummaries
1148 loop (concatMap msImports rootSummaries)
1149 (mkNodeMap rootSummaries)
1151 old_summary_map :: NodeMap ModSummary
1152 old_summary_map = mkNodeMap old_summaries
1154 getRootSummary :: FilePath -> IO ModSummary
1156 | isHaskellSrcFilename file
1157 = do exists <- doesFileExist file
1158 if exists then summariseFile dflags file else do
1159 throwDyn (CmdLineError ("can't find file `" ++ file ++ "'"))
1161 = do exists <- doesFileExist hs_file
1162 if exists then summariseFile dflags hs_file else do
1163 exists <- doesFileExist lhs_file
1164 if exists then summariseFile dflags lhs_file else do
1165 let mod_name = mkModule file
1166 maybe_summary <- summarise dflags emptyNodeMap Nothing False
1168 case maybe_summary of
1169 Nothing -> packageModErr mod_name
1172 hs_file = file ++ ".hs"
1173 lhs_file = file ++ ".lhs"
1175 -- In a root module, the filename is allowed to diverge from the module
1176 -- name, so we have to check that there aren't multiple root files
1177 -- defining the same module (otherwise the duplicates will be silently
1178 -- ignored, leading to confusing behaviour).
1179 checkDuplicates :: [ModSummary] -> IO ()
1180 checkDuplicates summaries = mapM_ check summaries
1185 many -> multiRootsErr modl many
1186 where modl = ms_mod summ
1188 [ fromJust (ml_hs_file (ms_location summ'))
1189 | summ' <- summaries, ms_mod summ' == modl ]
1191 loop :: [(FilePath,Module,IsBootInterface)] -- Work list: process these modules
1192 -> NodeMap ModSummary -- Visited set
1193 -> IO [ModSummary] -- The result includes the worklist, except
1194 -- for those mentioned in the visited set
1195 loop [] done = return (nodeMapElts done)
1196 loop ((cur_path, wanted_mod, is_boot) : ss) done
1197 | key `elemFM` done = loop ss done
1198 | otherwise = do { mb_s <- summarise dflags old_summary_map
1199 (Just cur_path) is_boot
1200 wanted_mod excl_mods
1202 Nothing -> loop ss done
1203 Just s -> loop (msImports s ++ ss)
1204 (addToFM done key s) }
1206 key = (wanted_mod, if is_boot then HsBootFile else HsSrcFile)
1208 msImports :: ModSummary -> [(FilePath, -- Importing module
1209 Module, -- Imported module
1210 IsBootInterface)] -- {-# SOURCE #-} import or not
1211 msImports s = [(f, m,True) | m <- ms_srcimps s]
1212 ++ [(f, m,False) | m <- ms_imps s]
1214 f = msHsFilePath s -- Keep the importing module for error reporting
1217 -----------------------------------------------------------------------------
1218 -- Summarising modules
1220 -- We have two types of summarisation:
1222 -- * Summarise a file. This is used for the root module(s) passed to
1223 -- cmLoadModules. The file is read, and used to determine the root
1224 -- module name. The module name may differ from the filename.
1226 -- * Summarise a module. We are given a module name, and must provide
1227 -- a summary. The finder is used to locate the file in which the module
1230 summariseFile :: DynFlags -> FilePath -> IO ModSummary
1231 -- Used for Haskell source only, I think
1232 -- We know the file name, and we know it exists,
1233 -- but we don't necessarily know the module name (might differ)
1234 summariseFile dflags file
1235 = do (dflags', hspp_fn) <- preprocess dflags file
1236 -- The dflags' contains the OPTIONS pragmas
1238 -- Read the file into a buffer. We're going to cache
1239 -- this buffer in the ModLocation (ml_hspp_buf) so that it
1240 -- doesn't have to be slurped again when hscMain parses the
1242 buf <- hGetStringBuffer hspp_fn
1243 (srcimps,the_imps,mod) <- getImports dflags' buf hspp_fn
1245 -- Make a ModLocation for this file
1246 location <- mkHomeModLocation mod file
1248 -- Tell the Finder cache where it is, so that subsequent calls
1249 -- to findModule will find it, even if it's not on any search path
1250 addHomeModuleToFinder mod location
1252 src_timestamp <- getModificationTime file
1253 return (ModSummary { ms_mod = mod, ms_hsc_src = HsSrcFile,
1254 ms_location = location,
1255 ms_hspp_file = Just hspp_fn,
1256 ms_hspp_buf = Just buf,
1257 ms_srcimps = srcimps, ms_imps = the_imps,
1258 ms_hs_date = src_timestamp })
1260 -- Summarise a module, and pick up source and timestamp.
1261 summarise :: DynFlags
1262 -> NodeMap ModSummary -- Map of old summaries
1263 -> Maybe FilePath -- Importing module (for error messages)
1264 -> IsBootInterface -- True <=> a {-# SOURCE #-} import
1265 -> Module -- Imported module to be summarised
1266 -> [Module] -- Modules to exclude
1267 -> IO (Maybe ModSummary) -- Its new summary
1269 summarise dflags old_summary_map cur_mod is_boot wanted_mod excl_mods
1270 | wanted_mod `elem` excl_mods
1273 | Just old_summary <- lookupFM old_summary_map (wanted_mod, hsc_src)
1274 = do { -- Find its new timestamp; all the
1275 -- ModSummaries in the old map have valid ml_hs_files
1276 let location = ms_location old_summary
1277 src_fn = fromJust (ml_hs_file location)
1279 ; src_timestamp <- getModificationTime src_fn
1281 -- return the cached summary if the source didn't change
1282 ; if ms_hs_date old_summary == src_timestamp
1283 then return (Just old_summary)
1284 else new_summary location
1288 = do { found <- findModule dflags wanted_mod True {-explicit-}
1291 | not (isHomePackage pkg) -> return Nothing -- Drop external-pkg
1292 | isJust (ml_hs_file location) -> new_summary location -- Home package
1293 err -> noModError dflags cur_mod wanted_mod err -- Not found
1296 hsc_src = if is_boot then HsBootFile else HsSrcFile
1298 new_summary location
1299 = do { -- Adjust location to point to the hs-boot source file,
1300 -- hi file, object file, when is_boot says so
1301 let location' | is_boot = addBootSuffixLocn location
1302 | otherwise = location
1303 src_fn = fromJust (ml_hs_file location')
1305 -- Check that it exists
1306 -- It might have been deleted since the Finder last found it
1307 ; exists <- doesFileExist src_fn
1308 ; if exists then return () else noHsFileErr cur_mod src_fn
1310 -- Preprocess the source file and get its imports
1311 -- The dflags' contains the OPTIONS pragmas
1312 ; (dflags', hspp_fn) <- preprocess dflags src_fn
1313 ; buf <- hGetStringBuffer hspp_fn
1314 ; (srcimps, the_imps, mod_name) <- getImports dflags' buf hspp_fn
1316 ; when (mod_name /= wanted_mod) $
1317 throwDyn (ProgramError
1318 (showSDoc (text src_fn
1319 <> text ": file name does not match module name"
1320 <+> quotes (ppr mod_name))))
1322 -- Find its timestamp, and return the summary
1323 ; src_timestamp <- getModificationTime src_fn
1324 ; return (Just ( ModSummary { ms_mod = wanted_mod,
1325 ms_hsc_src = hsc_src,
1326 ms_location = location',
1327 ms_hspp_file = Just hspp_fn,
1328 ms_hspp_buf = Just buf,
1329 ms_srcimps = srcimps,
1331 ms_hs_date = src_timestamp }))
1335 -----------------------------------------------------------------------------
1337 -----------------------------------------------------------------------------
1339 noModError :: DynFlags -> Maybe FilePath -> Module -> FindResult -> IO ab
1340 -- ToDo: we don't have a proper line number for this error
1341 noModError dflags cur_mod wanted_mod err
1342 = throwDyn $ ProgramError $ showSDoc $
1343 vcat [cantFindError dflags wanted_mod err,
1344 nest 2 (parens (pp_where cur_mod))]
1346 noHsFileErr cur_mod path
1347 = throwDyn $ CmdLineError $ showSDoc $
1348 vcat [text "Can't find" <+> text path,
1349 nest 2 (parens (pp_where cur_mod))]
1351 pp_where Nothing = text "one of the roots of the dependency analysis"
1352 pp_where (Just p) = text "imported from" <+> text p
1355 = throwDyn (CmdLineError (showSDoc (text "module" <+>
1356 quotes (ppr mod) <+>
1357 text "is a package module")))
1359 multiRootsErr mod files
1360 = throwDyn (ProgramError (showSDoc (
1361 text "module" <+> quotes (ppr mod) <+>
1362 text "is defined in multiple files:" <+>
1363 sep (map text files))))
1365 cyclicModuleErr :: [ModSummary] -> SDoc
1367 = hang (ptext SLIT("Module imports form a cycle for modules:"))
1368 2 (vcat (map show_one ms))
1370 show_one ms = sep [ show_mod (ms_hsc_src ms) (ms_mod ms),
1371 nest 2 $ ptext SLIT("imports:") <+>
1372 (pp_imps HsBootFile (ms_srcimps ms)
1373 $$ pp_imps HsSrcFile (ms_imps ms))]
1374 show_mod hsc_src mod = ppr mod <> text (hscSourceString hsc_src)
1375 pp_imps src mods = fsep (map (show_mod src) mods)