\section[CompManager]{The Compilation Manager}
\begin{code}
-module CompManager ( cmInit, cmLoadModule,
- cmGetExpr, cmRunExpr,
- CmState, emptyCmState -- abstract
- )
-where
+module CompManager (
+ cmInit, -- :: GhciMode -> IO CmState
-#include "HsVersions.h"
+ cmLoadModule, -- :: CmState -> FilePath -> IO (CmState, [String])
-import List ( nub )
-import Maybe ( catMaybes, maybeToList, fromMaybe )
-import Maybes ( maybeToBool )
-import Outputable
-import UniqFM ( emptyUFM, lookupUFM, addToUFM, delListFromUFM )
-import Digraph ( SCC(..), stronglyConnComp, flattenSCC, flattenSCCs )
-import Panic ( panic )
-
-import CmLink ( PersistentLinkerState, emptyPLS, Linkable(..),
- link, LinkResult(..),
- filterModuleLinkables, modname_of_linkable,
- is_package_linkable, findModuleLinkable )
-import Interpreter ( HValue )
-import CmSummarise ( summarise, ModSummary(..),
- name_of_summary, {-, is_source_import-} )
-import Module ( ModuleName, moduleName, packageOfModule,
- isModuleInThisPackage, PackageName, moduleEnvElts,
- moduleNameUserString )
-import CmStaticInfo ( Package(..), PackageConfigInfo, GhciMode )
-import DriverPipeline ( compile, preprocess, doLink, CompResult(..) )
-import HscTypes ( HomeSymbolTable, HomeIfaceTable,
- PersistentCompilerState, ModDetails(..) )
-import Name ( lookupNameEnv )
-import PrelNames ( mainName )
-import HscMain ( initPersistentCompilerState )
-import Finder ( findModule, emptyHomeDirCache )
-import DriverUtil ( BarfKind(..) )
-import Exception ( throwDyn )
-import IO ( hPutStrLn, stderr )
-\end{code}
+ cmUnload, -- :: CmState -> DynFlags -> IO CmState
+ cmSetContext, -- :: CmState -> String -> IO CmState
+ cmGetContext, -- :: CmState -> IO String
-\begin{code}
-cmInit :: PackageConfigInfo -> GhciMode -> IO CmState
-cmInit raw_package_info gmode
- = emptyCmState raw_package_info gmode
+#ifdef GHCI
+ cmRunStmt, -- :: CmState -> DynFlags -> String -> IO (CmState, [Name])
-cmGetExpr :: CmState
- -> ModuleName
- -> String
- -> IO (CmState, Either [SDoc] HValue)
-cmGetExpr cmstate modhdl expr
- = return (panic "cmGetExpr:unimp")
+ cmTypeOfExpr, -- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, Maybe String)
-cmRunExpr :: HValue -> IO ()
-cmRunExpr hval
- = return (panic "cmRunExpr:unimp")
+ cmTypeOfName, -- :: CmState -> Name -> IO (Maybe String)
+ cmCompileExpr,-- :: CmState -> DynFlags -> String
+ -- -> IO (CmState, Maybe HValue)#endif
+#endif
+ CmState, emptyCmState -- abstract
+ )
+where
--- Persistent state just for CM, excluding link & compile subsystems
-data PersistentCMState
- = PersistentCMState {
- hst :: HomeSymbolTable, -- home symbol table
- hit :: HomeIfaceTable, -- home interface table
- ui :: UnlinkedImage, -- the unlinked images
- mg :: ModuleGraph, -- the module graph
- pci :: PackageConfigInfo, -- NEVER CHANGES
- gmode :: GhciMode -- NEVER CHANGES
- }
+#include "HsVersions.h"
+
+import CmLink
+import CmTypes
+import DriverPipeline
+import DriverFlags ( getDynFlags )
+import DriverPhases
+import DriverUtil
+import Finder
+import HscMain ( initPersistentCompilerState )
+import HscTypes
+import RnEnv ( unQualInScope )
+import Id ( idType, idName )
+import Name ( Name, NamedThing(..), nameRdrName )
+import NameEnv
+import RdrName ( lookupRdrEnv, emptyRdrEnv )
+import Module
+import GetImports
+import Type ( tidyType )
+import VarEnv ( emptyTidyEnv )
+import UniqFM
+import Unique ( Uniquable )
+import Digraph ( SCC(..), stronglyConnComp, flattenSCC )
+import ErrUtils ( showPass )
+import SysTools ( cleanTempFilesExcept )
+import Util
+import Outputable
+import Panic
+import CmdLineOpts ( DynFlags(..) )
+import IOExts
-emptyPCMS :: PackageConfigInfo -> GhciMode -> PersistentCMState
-emptyPCMS pci gmode
- = PersistentCMState { hst = emptyHST, hit = emptyHIT,
- ui = emptyUI, mg = emptyMG,
- pci = pci, gmode = gmode }
+#ifdef GHCI
+import Interpreter ( HValue )
+import HscMain ( hscStmt )
+import PrelGHC ( unsafeCoerce# )
+#endif
-emptyHIT :: HomeIfaceTable
-emptyHIT = emptyUFM
-emptyHST :: HomeSymbolTable
-emptyHST = emptyUFM
+-- lang
+import Exception ( throwDyn )
+-- std
+import Directory ( getModificationTime, doesFileExist )
+import IO
+import Monad
+import List ( nub )
+import Maybe
+\end{code}
+\begin{code}
-- Persistent state for the entire system
data CmState
= CmState {
- pcms :: PersistentCMState, -- CM's persistent state
+ hst :: HomeSymbolTable, -- home symbol table
+ hit :: HomeIfaceTable, -- home interface table
+ ui :: UnlinkedImage, -- the unlinked images
+ mg :: ModuleGraph, -- the module graph
+ gmode :: GhciMode, -- NEVER CHANGES
+ ic :: InteractiveContext, -- command-line binding info
+
pcs :: PersistentCompilerState, -- compile's persistent state
pls :: PersistentLinkerState -- link's persistent state
}
-emptyCmState :: PackageConfigInfo -> GhciMode -> IO CmState
-emptyCmState pci gmode
- = do let pcms = emptyPCMS pci gmode
- pcs <- initPersistentCompilerState
+emptyCmState :: GhciMode -> Module -> IO CmState
+emptyCmState gmode mod
+ = do pcs <- initPersistentCompilerState
pls <- emptyPLS
- return (CmState { pcms = pcms,
+ return (CmState { hst = emptySymbolTable,
+ hit = emptyIfaceTable,
+ ui = emptyUI,
+ mg = emptyMG,
+ gmode = gmode,
+ ic = emptyInteractiveContext mod,
pcs = pcs,
pls = pls })
+emptyInteractiveContext mod
+ = InteractiveContext { ic_module = mod,
+ ic_rn_env = emptyRdrEnv,
+ ic_type_env = emptyTypeEnv }
+
+defaultCurrentModuleName = mkModuleName "Prelude"
+GLOBAL_VAR(defaultCurrentModule, error "no defaultCurrentModule", Module)
+
-- CM internal types
type UnlinkedImage = [Linkable] -- the unlinked images (should be a set, really)
emptyUI :: UnlinkedImage
emptyMG :: ModuleGraph
emptyMG = []
-\end{code}
-
-The real business of the compilation manager: given a system state and
-a module name, try and bring the module up to date, probably changing
-the system state at the same time.
+-----------------------------------------------------------------------------
+-- Produce an initial CmState.
+
+cmInit :: GhciMode -> IO CmState
+cmInit mode = do
+ prel <- moduleNameToModule defaultCurrentModuleName
+ writeIORef defaultCurrentModule prel
+ emptyCmState mode prel
+
+-----------------------------------------------------------------------------
+-- Setting the context doesn't throw away any bindings; the bindings
+-- we've built up in the InteractiveContext simply move to the new
+-- module. They always shadow anything in scope in the current context.
+
+cmSetContext :: CmState -> String -> IO CmState
+cmSetContext cmstate str
+ = do let mn = mkModuleName str
+ modules_loaded = [ (name_of_summary s, ms_mod s) | s <- mg cmstate ]
+
+ m <- case lookup mn modules_loaded of
+ Just m -> return m
+ Nothing -> do
+ mod <- moduleNameToModule mn
+ if isHomeModule mod
+ then throwDyn (CmdLineError (showSDoc
+ (quotes (ppr (moduleName mod))
+ <+> text "is not currently loaded")))
+ else return mod
+
+ return cmstate{ ic = (ic cmstate){ic_module=m} }
+
+cmGetContext :: CmState -> IO String
+cmGetContext cmstate = return (moduleUserString (ic_module (ic cmstate)))
+
+moduleNameToModule :: ModuleName -> IO Module
+moduleNameToModule mn
+ = do maybe_stuff <- findModule mn
+ case maybe_stuff of
+ Nothing -> throwDyn (CmdLineError ("can't find module `"
+ ++ moduleNameUserString mn ++ "'"))
+ Just (m,_) -> return m
+
+-----------------------------------------------------------------------------
+-- cmRunStmt: Run a statement/expr.
+
+#ifdef GHCI
+cmRunStmt :: CmState -> DynFlags -> String
+ -> IO (CmState, -- new state
+ [Name]) -- names bound by this evaluation
+cmRunStmt cmstate dflags expr
+ = do
+ let InteractiveContext {
+ ic_rn_env = rn_env,
+ ic_type_env = type_env,
+ ic_module = this_mod } = icontext
+
+ (new_pcs, maybe_stuff)
+ <- hscStmt dflags hst hit pcs icontext expr False{-stmt-}
+
+ case maybe_stuff of
+ Nothing -> return (cmstate{ pcs=new_pcs }, [])
+ Just (ids, _, bcos) -> do
+
+ -- update the interactive context
+ let
+ names = map idName ids
+
+ -- these names have just been shadowed
+ shadowed = [ n | r <- map nameRdrName names,
+ Just n <- [lookupRdrEnv rn_env r] ]
+
+ new_rn_env = extendLocalRdrEnv rn_env names
+
+ -- remove any shadowed bindings from the type_env
+ filtered_type_env = delListFromNameEnv type_env shadowed
+
+ new_type_env = extendNameEnvList filtered_type_env
+ [ (getName id, AnId id) | id <- ids]
+
+ new_ic = icontext { ic_rn_env = new_rn_env,
+ ic_type_env = new_type_env }
+
+ -- link it
+ hval <- linkExpr pls bcos
+
+ -- run it!
+ let thing_to_run = unsafeCoerce# hval :: IO [HValue]
+ hvals <- thing_to_run
+
+ -- Get the newly bound things, and bind them. Don't forget
+ -- to delete any shadowed bindings from the closure_env, lest
+ -- we end up with a space leak.
+ pls <- delListFromClosureEnv pls shadowed
+ new_pls <- addListToClosureEnv pls (zip names hvals)
+
+ return (cmstate{ pcs=new_pcs, pls=new_pls, ic=new_ic }, names)
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext } = cmstate
+#endif
+
+-----------------------------------------------------------------------------
+-- cmTypeOfExpr: returns a string representing the type of an expression
+
+#ifdef GHCI
+cmTypeOfExpr :: CmState -> DynFlags -> String -> IO (CmState, Maybe String)
+cmTypeOfExpr cmstate dflags expr
+ = do (new_pcs, maybe_stuff)
+ <- hscStmt dflags hst hit pcs ic expr True{-just an expr-}
+
+ let new_cmstate = cmstate{pcs = new_pcs}
+
+ case maybe_stuff of
+ Nothing -> return (new_cmstate, Nothing)
+ Just (_, ty, _) ->
+ let pit = pcs_PIT pcs
+ modname = moduleName (ic_module ic)
+ tidy_ty = tidyType emptyTidyEnv ty
+ str = case lookupIfaceByModName hit pit modname of
+ Nothing -> showSDoc (ppr tidy_ty)
+ Just iface -> showSDocForUser unqual (ppr tidy_ty)
+ where unqual = unQualInScope (mi_globals iface)
+ in return (new_cmstate, Just str)
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, ic=ic } = cmstate
+#endif
+
+-----------------------------------------------------------------------------
+-- cmTypeOfName: returns a string representing the type of a name.
+
+#ifdef GHCI
+cmTypeOfName :: CmState -> Name -> IO (Maybe String)
+cmTypeOfName CmState{ hit=hit, pcs=pcs, ic=ic } name
+ = case lookupNameEnv (ic_type_env ic) name of
+ Nothing -> return Nothing
+ Just (AnId id) ->
+ let pit = pcs_PIT pcs
+ modname = moduleName (ic_module ic)
+ ty = tidyType emptyTidyEnv (idType id)
+ str = case lookupIfaceByModName hit pit modname of
+ Nothing -> showSDoc (ppr ty)
+ Just iface -> showSDocForUser unqual (ppr ty)
+ where unqual = unQualInScope (mi_globals iface)
+ in return (Just str)
+
+ _ -> panic "cmTypeOfName"
+#endif
+
+-----------------------------------------------------------------------------
+-- cmCompileExpr: compile an expression and deliver an HValue
+
+#ifdef GHCI
+cmCompileExpr :: CmState -> DynFlags -> String -> IO (CmState, Maybe HValue)
+cmCompileExpr cmstate dflags expr
+ = do
+ let InteractiveContext {
+ ic_rn_env = rn_env,
+ ic_type_env = type_env,
+ ic_module = this_mod } = icontext
+
+ (new_pcs, maybe_stuff)
+ <- hscStmt dflags hst hit pcs icontext
+ ("let __cmCompileExpr = "++expr) False{-stmt-}
+
+ case maybe_stuff of
+ Nothing -> return (cmstate{ pcs=new_pcs }, Nothing)
+ Just (ids, _, bcos) -> do
+
+ -- link it
+ hval <- linkExpr pls bcos
+
+ -- run it!
+ let thing_to_run = unsafeCoerce# hval :: IO [HValue]
+ hvals <- thing_to_run
+
+ case (ids,hvals) of
+ ([id],[hv]) -> return (cmstate{ pcs=new_pcs }, Just hv)
+ _ -> panic "cmCompileExpr"
+
+ where
+ CmState{ hst=hst, hit=hit, pcs=pcs, pls=pls, ic=icontext } = cmstate
+#endif
+
+-----------------------------------------------------------------------------
+-- cmInfo: return "info" about an expression. The info might be:
+--
+-- * its type, for an expression,
+-- * the class definition, for a class
+-- * the datatype definition, for a tycon (or synonym)
+-- * the export list, for a module
+--
+-- Can be used to find the type of the last expression compiled, by looking
+-- for "it".
+
+cmInfo :: CmState -> String -> IO (Maybe String)
+cmInfo cmstate str
+ = do error "cmInfo not implemented yet"
+
+-----------------------------------------------------------------------------
+-- Unload the compilation manager's state: everything it knows about the
+-- current collection of modules in the Home package.
+
+cmUnload :: CmState -> DynFlags -> IO CmState
+cmUnload state@CmState{ gmode=mode, pls=pls, pcs=pcs } dflags
+ = do -- Throw away the old home dir cache
+ emptyHomeDirCache
+
+ -- Unload everything the linker knows about
+ new_pls <- CmLink.unload mode dflags [] pls
+
+ -- Start with a fresh CmState, but keep the PersistentCompilerState
+ new_state <- cmInit mode
+ return new_state{ pcs=pcs, pls=new_pls }
+
+-----------------------------------------------------------------------------
+-- The real business of the compilation manager: given a system state and
+-- a module name, try and bring the module up to date, probably changing
+-- the system state at the same time.
-\begin{code}
cmLoadModule :: CmState
- -> ModuleName
- -> IO (CmState, Maybe ModuleName)
+ -> [FilePath]
+ -> IO (CmState, -- new state
+ Bool, -- was successful
+ [String]) -- list of modules loaded
-cmLoadModule cmstate1 rootname
+cmLoadModule cmstate1 rootnames
= do -- version 1's are the original, before downsweep
- let pcms1 = pcms cmstate1
let pls1 = pls cmstate1
let pcs1 = pcs cmstate1
- let mg1 = mg pcms1
- let hst1 = hst pcms1
- let hit1 = hit pcms1
- let ui1 = ui pcms1
-
- let pcii = pci pcms1 -- this never changes
- let ghci_mode = gmode pcms1 -- ToDo: fix!
+ let hst1 = hst cmstate1
+ let hit1 = hit cmstate1
+ -- similarly, ui1 is the (complete) set of linkables from
+ -- the previous pass, if any.
+ let ui1 = ui cmstate1
+ let mg1 = mg cmstate1
+ let ic1 = ic cmstate1
- -- Do the downsweep to reestablish the module graph
- -- then generate version 2's by removing from HIT,HST,UI any
- -- modules in the old MG which are not in the new one.
-
- -- Throw away the old home dir cache
- emptyHomeDirCache
-
- putStr "cmLoadModule: downsweep begins\n"
- mg2unsorted <- downsweep [rootname]
+ let ghci_mode = gmode cmstate1 -- this never changes
- let modnames1 = map name_of_summary mg1
- let modnames2 = map name_of_summary mg2unsorted
- let mods_to_zap = filter (`notElem` modnames2) modnames1
-
- let (hst2, hit2, ui2)
- = removeFromTopLevelEnvs mods_to_zap (hst1, hit1, ui1)
+ -- Do the downsweep to reestablish the module graph
+ dflags <- getDynFlags
+ let verb = verbosity dflags
+
+ showPass dflags "Chasing dependencies"
+ when (verb >= 1 && ghci_mode == Batch) $
+ hPutStrLn stderr (showSDoc (hcat [
+ text progName, text ": chasing modules from: ",
+ hcat (punctuate comma (map text rootnames))]))
+
+ (mg2unsorted, a_root_is_Main) <- downsweep rootnames mg1
+ let mg2unsorted_names = map name_of_summary mg2unsorted
+
+ -- reachable_from follows source as well as normal imports
+ let reachable_from :: ModuleName -> [ModuleName]
+ reachable_from = downwards_closure_of_module mg2unsorted
+
-- should be cycle free; ignores 'import source's
let mg2 = topological_sort False mg2unsorted
- -- ... whereas this takes them into account. Only used for
+ -- ... whereas this takes them into account. Used for
-- backing out partially complete cycles following a failed
- -- upsweep.
+ -- upsweep, and for removing from hst/hit all the modules
+ -- not in strict downwards closure, during calls to compile.
let mg2_with_srcimps = topological_sort True mg2unsorted
-
- putStrLn "after tsort:\n"
- putStrLn (showSDoc (vcat (map ppr mg2)))
+
+ -- Sort out which linkables we wish to keep in the unlinked image.
+ -- See getValidLinkables below for details.
+ valid_linkables <- getValidLinkables ui1 mg2unsorted_names
+ mg2_with_srcimps
+ -- when (verb >= 2) $
+ -- putStrLn (showSDoc (text "Valid linkables:"
+ -- <+> ppr valid_linkables))
+
+ -- Figure out a stable set of modules which can be retained
+ -- the top level envs, to avoid upsweeping them. Goes to a
+ -- bit of trouble to avoid upsweeping module cycles.
+ --
+ -- Construct a set S of stable modules like this:
+ -- Travel upwards, over the sccified graph. For each scc
+ -- of modules ms, add ms to S only if:
+ -- 1. All home imports of ms are either in ms or S
+ -- 2. A valid linkable exists for each module in ms
+
+ stable_mods <- preUpsweep valid_linkables hit1
+ mg2unsorted_names [] mg2_with_srcimps
+
+ let stable_summaries
+ = concatMap (findInSummaries mg2unsorted) stable_mods
+
+ stable_linkables
+ = filter (\m -> linkableModName m `elem` stable_mods)
+ valid_linkables
+
+ when (verb >= 2) $
+ putStrLn (showSDoc (text "Stable modules:"
+ <+> sep (map (text.moduleNameUserString) stable_mods)))
+
+ -- unload any modules which aren't going to be re-linked this
+ -- time around.
+ pls2 <- unload ghci_mode dflags stable_linkables pls1
+
+ -- We could at this point detect cycles which aren't broken by
+ -- a source-import, and complain immediately, but it seems better
+ -- to let upsweep_mods do this, so at least some useful work gets
+ -- done before the upsweep is abandoned.
+ let upsweep_these
+ = filter (\scc -> any (`notElem` stable_mods)
+ (map name_of_summary (flattenSCC scc)))
+ mg2
+
+ --hPutStrLn stderr "after tsort:\n"
+ --hPutStrLn stderr (showSDoc (vcat (map ppr mg2)))
-- Because we don't take into account source imports when doing
-- the topological sort, there shouldn't be any cycles in mg2.
-- Now do the upsweep, calling compile for each module in
-- turn. Final result is version 3 of everything.
- let threaded2 = CmThreaded pcs1 hst2 hit2
+ let threaded2 = CmThreaded pcs1 hst1 hit1
- (upsweep_complete_success, threaded3, modsDone, newLis)
- <- upsweep_mods ui2 threaded2 mg2
+ (upsweep_complete_success, threaded3, modsUpswept, newLis)
+ <- upsweep_mods ghci_mode dflags valid_linkables reachable_from
+ threaded2 upsweep_these
- let ui3 = add_to_ui ui2 newLis
+ let ui3 = add_to_ui valid_linkables newLis
let (CmThreaded pcs3 hst3 hit3) = threaded3
- -- At this point, modsDone and newLis should have the same
+ -- At this point, modsUpswept and newLis should have the same
-- length, so there is one new (or old) linkable for each
-- mod which was processed (passed to compile).
+ -- Make modsDone be the summaries for each home module now
+ -- available; this should equal the domains of hst3 and hit3.
+ -- (NOT STRICTLY TRUE if an interactive session was started
+ -- with some object on disk ???)
+ -- Get in in a roughly top .. bottom order (hence reverse).
+
+ let modsDone = reverse modsUpswept ++ stable_summaries
+
-- Try and do linking in some form, depending on whether the
-- upsweep was completely or only partially successful.
then
-- Easy; just relink it all.
- do putStrLn "UPSWEEP COMPLETELY SUCCESSFUL"
- linkresult
- <- link doLink ghci_mode (any exports_main (moduleEnvElts hst3))
- newLis pls1
- case linkresult of
- LinkErrs _ _
- -> panic "cmLoadModule: link failed (1)"
- LinkOK pls3
- -> do let pcms3 = PersistentCMState { hst=hst3, hit=hit3,
- ui=ui3, mg=modsDone,
- pci=pcii, gmode=ghci_mode }
- let cmstate3
- = CmState { pcms=pcms3, pcs=pcs3, pls=pls3 }
- return (cmstate3, Just rootname)
+ do when (verb >= 2) $
+ hPutStrLn stderr "Upsweep completely successful."
+
+ -- clean up after ourselves
+ cleanTempFilesExcept verb (ppFilesFromSummaries modsDone)
+
+ -- link everything together
+ linkresult <- link ghci_mode dflags a_root_is_Main ui3 pls2
+
+ cmLoadFinish True linkresult
+ hst3 hit3 ui3 modsDone ghci_mode pcs3
else
-- Tricky. We need to back out the effects of compiling any
-- half-done cycles, both so as to clean up the top level envs
-- and to avoid telling the interactive linker to link them.
- do putStrLn "UPSWEEP PARTIALLY SUCCESSFUL"
+ do when (verb >= 2) $
+ hPutStrLn stderr "Upsweep partially successful."
let modsDone_names
= map name_of_summary modsDone
let mods_to_zap_names
- = findPartiallyCompletedCycles modsDone_names mg2_with_srcimps
- let (hst4, hit4, ui4)
- = removeFromTopLevelEnvs mods_to_zap_names (hst3,hit3,ui3)
+ = findPartiallyCompletedCycles modsDone_names
+ mg2_with_srcimps
let mods_to_keep
- = filter ((`notElem` mods_to_zap_names).name_of_summary) modsDone
- let mods_to_keep_names
- = map name_of_summary mods_to_keep
- -- we could get the relevant linkables by filtering newLis, but
- -- it seems easier to drag them out of the updated, cleaned-up UI
- let linkables_to_link
- = map (findModuleLinkable ui4) mods_to_keep_names
-
- linkresult <- link doLink ghci_mode False linkables_to_link pls1
- case linkresult of
- LinkErrs _ _
- -> panic "cmLoadModule: link failed (2)"
- LinkOK pls4
- -> do let pcms4 = PersistentCMState { hst=hst4, hit=hit4,
- ui=ui4, mg=mods_to_keep,
- pci=pcii, gmode=ghci_mode }
- let cmstate4
- = CmState { pcms=pcms4, pcs=pcs3, pls=pls4 }
- return (cmstate4,
- -- choose rather arbitrarily who to return
- if null mods_to_keep then Nothing
- else Just (last mods_to_keep_names))
-
+ = filter ((`notElem` mods_to_zap_names).name_of_summary)
+ modsDone
+
+ let (hst4, hit4, ui4)
+ = retainInTopLevelEnvs (map name_of_summary mods_to_keep)
+ (hst3,hit3,ui3)
+
+ -- clean up after ourselves
+ cleanTempFilesExcept verb (ppFilesFromSummaries mods_to_keep)
+
+ -- link everything together
+ linkresult <- link ghci_mode dflags False ui4 pls2
+
+ cmLoadFinish False linkresult
+ hst4 hit4 ui4 mods_to_keep ghci_mode pcs3
+
+
+-- Finish up after a cmLoad.
+--
+-- Empty the interactive context and set the module context to the topmost
+-- newly loaded module, or the Prelude if none were loaded.
+cmLoadFinish ok linkresult hst hit ui mods ghci_mode pcs
+ = do case linkresult of {
+ LinkErrs _ _ -> panic "cmLoadModule: link failed (2)";
+ LinkOK pls -> do
+
+ def_mod <- readIORef defaultCurrentModule
+ let current_mod = case mods of
+ [] -> def_mod
+ (x:_) -> ms_mod x
+
+ new_ic = emptyInteractiveContext current_mod
+
+ new_cmstate = CmState{ hst=hst, hit=hit,
+ ui=ui, mg=mods,
+ gmode=ghci_mode, pcs=pcs,
+ pls=pls,
+ ic = new_ic }
+ mods_loaded = map (moduleNameUserString.name_of_summary) mods
+
+ return (new_cmstate, ok, mods_loaded)
+ }
+
+ppFilesFromSummaries summaries
+ = [ fn | Just fn <- map (ml_hspp_file . ms_location) summaries ]
+
+-----------------------------------------------------------------------------
+-- getValidLinkables
+
+-- For each module (or SCC of modules), we take:
+--
+-- - an on-disk linkable, if this is the first time around and one
+-- is available.
+--
+-- - the old linkable, otherwise (and if one is available).
+--
+-- and we throw away the linkable if it is older than the source
+-- file. We ignore the on-disk linkables unless all of the dependents
+-- of this SCC also have on-disk linkables.
+--
+-- If a module has a valid linkable, then it may be STABLE (see below),
+-- and it is classified as SOURCE UNCHANGED for the purposes of calling
+-- compile.
+--
+-- ToDo: this pass could be merged with the preUpsweep.
+
+getValidLinkables
+ :: [Linkable] -- old linkables
+ -> [ModuleName] -- all home modules
+ -> [SCC ModSummary] -- all modules in the program, dependency order
+ -> IO [Linkable] -- still-valid linkables
+
+getValidLinkables old_linkables all_home_mods module_graph
+ = foldM (getValidLinkablesSCC old_linkables all_home_mods) [] module_graph
+
+getValidLinkablesSCC old_linkables all_home_mods new_linkables scc0
+ = let
+ scc = flattenSCC scc0
+ scc_names = map name_of_summary scc
+ home_module m = m `elem` all_home_mods && m `notElem` scc_names
+ scc_allhomeimps = nub (filter home_module (concatMap ms_imps scc))
+ -- NOTE: ms_imps, not ms_allimps above. We don't want to
+ -- force a module's SOURCE imports to be already compiled for
+ -- its object linkable to be valid.
+
+ has_object m = case findModuleLinkable_maybe new_linkables m of
+ Nothing -> False
+ Just l -> isObjectLinkable l
+
+ objects_allowed = all has_object scc_allhomeimps
+ in do
+
+ these_linkables
+ <- foldM (getValidLinkable old_linkables objects_allowed) [] scc
+
+ -- since an scc can contain only all objects or no objects at all,
+ -- we have to check whether we got all objects or not, and re-do
+ -- the linkable check if not.
+ adjusted_linkables
+ <- if objects_allowed && not (all isObjectLinkable these_linkables)
+ then foldM (getValidLinkable old_linkables False) [] scc
+ else return these_linkables
+
+ return (adjusted_linkables ++ new_linkables)
+
+
+getValidLinkable :: [Linkable] -> Bool -> [Linkable] -> ModSummary
+ -> IO [Linkable]
+getValidLinkable old_linkables objects_allowed new_linkables summary
+ = do let mod_name = name_of_summary summary
+
+ maybe_disk_linkable
+ <- if (not objects_allowed)
+ then return Nothing
+ else case ml_obj_file (ms_location summary) of
+ Just obj_fn -> maybe_getFileLinkable mod_name obj_fn
+ Nothing -> return Nothing
+
+ let old_linkable = findModuleLinkable_maybe old_linkables mod_name
+ maybe_old_linkable =
+ case old_linkable of
+ Just l | not (isObjectLinkable l) || stillThere l
+ -> old_linkable
+ -- ToDo: emit a warning if not (stillThere l)
+ other -> Nothing
+
+ -- make sure that if we had an old disk linkable around, that it's
+ -- still there on the disk (in case we need to re-link it).
+ stillThere l =
+ case maybe_disk_linkable of
+ Nothing -> False
+ Just l_disk -> linkableTime l == linkableTime l_disk
+
+ -- we only look for objects on disk the first time around;
+ -- if the user compiles a module on the side during a GHCi session,
+ -- it won't be picked up until the next ":load". This is what the
+ -- "null old_linkables" test below is.
+ linkable | null old_linkables = maybeToList maybe_disk_linkable
+ | otherwise = maybeToList maybe_old_linkable
+
+ -- only linkables newer than the source code are valid
+ src_date = ms_hs_date summary
+
+ valid_linkable
+ = filter (\l -> linkableTime l > src_date) linkable
+
+ return (valid_linkable ++ new_linkables)
+
+
+maybe_getFileLinkable :: ModuleName -> FilePath -> IO (Maybe Linkable)
+maybe_getFileLinkable mod_name obj_fn
+ = do obj_exist <- doesFileExist obj_fn
+ if not obj_exist
+ then return Nothing
+ else
+ do let stub_fn = case splitFilename3 obj_fn of
+ (dir, base, ext) -> dir ++ "/" ++ base ++ ".stub_o"
+ stub_exist <- doesFileExist stub_fn
+ obj_time <- getModificationTime obj_fn
+ if stub_exist
+ then return (Just (LM obj_time mod_name [DotO obj_fn, DotO stub_fn]))
+ else return (Just (LM obj_time mod_name [DotO obj_fn]))
+
+
+-----------------------------------------------------------------------------
+-- Do a pre-upsweep without use of "compile", to establish a
+-- (downward-closed) set of stable modules for which we won't call compile.
+
+-- a stable module:
+-- * has a valid linkable (see getValidLinkables above)
+-- * depends only on stable modules
+-- * has an interface in the HIT (interactive mode only)
+
+preUpsweep :: [Linkable] -- new valid linkables
+ -> HomeIfaceTable
+ -> [ModuleName] -- names of all mods encountered in downsweep
+ -> [ModuleName] -- accumulating stable modules
+ -> [SCC ModSummary] -- scc-ified mod graph, including src imps
+ -> IO [ModuleName] -- stable modules
+
+preUpsweep valid_lis hit all_home_mods stable [] = return stable
+preUpsweep valid_lis hit all_home_mods stable (scc0:sccs)
+ = do let scc = flattenSCC scc0
+ scc_allhomeimps :: [ModuleName]
+ scc_allhomeimps
+ = nub (filter (`elem` all_home_mods) (concatMap ms_allimps scc))
+ all_imports_in_scc_or_stable
+ = all in_stable_or_scc scc_allhomeimps
+ scc_names
+ = map name_of_summary scc
+ in_stable_or_scc m
+ = m `elem` scc_names || m `elem` stable
+
+ -- now we check for valid linkables: each module in the SCC must
+ -- have a valid linkable (see getValidLinkables above).
+ has_valid_linkable new_summary
+ = isJust (findModuleLinkable_maybe valid_lis modname)
+ where modname = name_of_summary new_summary
+
+ has_interface summary = ms_mod summary `elemUFM` hit
+
+ scc_is_stable = all_imports_in_scc_or_stable
+ && all has_valid_linkable scc
+ && all has_interface scc
+
+ if scc_is_stable
+ then preUpsweep valid_lis hit all_home_mods (scc_names++stable) sccs
+ else preUpsweep valid_lis hit all_home_mods stable sccs
+
+
+-- Helper for preUpsweep. Assuming that new_summary's imports are all
+-- stable (in the sense of preUpsweep), determine if new_summary is itself
+-- stable, and, if so, in batch mode, return its linkable.
+findInSummaries :: [ModSummary] -> ModuleName -> [ModSummary]
+findInSummaries old_summaries mod_name
+ = [s | s <- old_summaries, name_of_summary s == mod_name]
+
+findModInSummaries :: [ModSummary] -> Module -> Maybe ModSummary
+findModInSummaries old_summaries mod
+ = case [s | s <- old_summaries, ms_mod s == mod] of
+ [] -> Nothing
+ (s:_) -> Just s
-- Return (names of) all those in modsDone who are part of a cycle
-- as defined by theGraph.
else chewed_rest
-exports_main :: ModDetails -> Bool
-exports_main md
- = maybeToBool (lookupNameEnv (md_types md) mainName)
-
-
-- Add the given (LM-form) Linkables to the UI, overwriting previous
-- versions if they exist.
add_to_ui :: UnlinkedImage -> [Linkable] -> UnlinkedImage
add_to_ui ui lis
- = foldr add1 ui lis
+ = filter (not_in lis) ui ++ lis
where
- add1 :: Linkable -> UnlinkedImage -> UnlinkedImage
- add1 li ui
- = li : filter (\li2 -> not (for_same_module li li2)) ui
-
- for_same_module :: Linkable -> Linkable -> Bool
- for_same_module li1 li2
- = not (is_package_linkable li1)
- && not (is_package_linkable li2)
- && modname_of_linkable li1 == modname_of_linkable li2
+ not_in :: [Linkable] -> Linkable -> Bool
+ not_in lis li
+ = all (\l -> linkableModName l /= mod) lis
+ where mod = linkableModName li
data CmThreaded -- stuff threaded through individual module compilations
-- Compile multiple modules, stopping as soon as an error appears.
-- There better had not be any cyclic groups here -- we check for them.
-upsweep_mods :: UnlinkedImage -- old linkables
+upsweep_mods :: GhciMode
+ -> DynFlags
+ -> UnlinkedImage -- valid linkables
+ -> (ModuleName -> [ModuleName]) -- to construct downward closures
-> CmThreaded -- PCS & HST & HIT
-> [SCC ModSummary] -- mods to do (the worklist)
-- ...... RETURNING ......
[ModSummary], -- mods which succeeded
[Linkable]) -- new linkables
-upsweep_mods oldUI threaded []
+upsweep_mods ghci_mode dflags oldUI reachable_from threaded
+ []
= return (True, threaded, [], [])
-upsweep_mods oldUI threaded ((CyclicSCC ms):_)
- = do hPutStrLn stderr ("ghc: module imports form a cycle for modules:\n\t" ++
+upsweep_mods ghci_mode dflags oldUI reachable_from threaded
+ ((CyclicSCC ms):_)
+ = do hPutStrLn stderr ("Module imports form a cycle for modules:\n\t" ++
unwords (map (moduleNameUserString.name_of_summary) ms))
return (False, threaded, [], [])
-upsweep_mods oldUI threaded ((AcyclicSCC mod):mods)
- = do (threaded1, maybe_linkable) <- upsweep_mod oldUI threaded mod
+upsweep_mods ghci_mode dflags oldUI reachable_from threaded
+ ((AcyclicSCC mod):mods)
+ = do --case threaded of
+ -- CmThreaded pcsz hstz hitz
+ -- -> putStrLn ("UPSWEEP_MOD: hit = " ++ show (map (moduleNameUserString.moduleName.mi_module) (eltsUFM hitz)))
+
+ (threaded1, maybe_linkable)
+ <- upsweep_mod ghci_mode dflags oldUI threaded mod
+ (reachable_from (name_of_summary mod))
case maybe_linkable of
Just linkable
-> -- No errors; do the rest
do (restOK, threaded2, modOKs, linkables)
- <- upsweep_mods oldUI threaded1 mods
+ <- upsweep_mods ghci_mode dflags oldUI reachable_from
+ threaded1 mods
return (restOK, threaded2, mod:modOKs, linkable:linkables)
Nothing -- we got a compilation error; give up now
-> return (False, threaded1, [], [])
-- Compile a single module. Always produce a Linkable for it if
-- successful. If no compilation happened, return the old Linkable.
-upsweep_mod :: UnlinkedImage
+upsweep_mod :: GhciMode
+ -> DynFlags
+ -> UnlinkedImage
-> CmThreaded
-> ModSummary
+ -> [ModuleName]
-> IO (CmThreaded, Maybe Linkable)
-upsweep_mod oldUI threaded1 summary1
- = do let mod_name = name_of_summary summary1
+upsweep_mod ghci_mode dflags oldUI threaded1 summary1 reachable_inc_me
+ = do
+ let mod_name = name_of_summary summary1
+ let verb = verbosity dflags
+
let (CmThreaded pcs1 hst1 hit1) = threaded1
- let old_iface = lookupUFM hit1 (name_of_summary summary1)
- compresult <- compile summary1 old_iface hst1 hit1 pcs1
+ let old_iface = lookupUFM hit1 mod_name
+
+ let maybe_old_linkable = findModuleLinkable_maybe oldUI mod_name
+
+ source_unchanged = isJust maybe_old_linkable
+
+ reachable_only = filter (/= (name_of_summary summary1))
+ reachable_inc_me
+
+ -- in interactive mode, all home modules below us *must* have an
+ -- interface in the HIT. We never demand-load home interfaces in
+ -- interactive mode.
+ (hst1_strictDC, hit1_strictDC, [])
+ = ASSERT(ghci_mode == Batch ||
+ all (`elemUFM` hit1) reachable_only)
+ retainInTopLevelEnvs reachable_only (hst1,hit1,[])
+
+ old_linkable
+ = unJust "upsweep_mod:old_linkable" maybe_old_linkable
+
+ have_object
+ | Just l <- maybe_old_linkable, isObjectLinkable l = True
+ | otherwise = False
+
+ compresult <- compile ghci_mode summary1 source_unchanged
+ have_object old_iface hst1_strictDC hit1_strictDC pcs1
case compresult of
- -- Compilation "succeeded", but didn't return a new iface or
- -- linkable, meaning that compilation wasn't needed, and the
- -- new details were manufactured from the old iface.
- CompOK details Nothing pcs2
- -> let hst2 = addToUFM hst1 mod_name details
- hit2 = hit1
- threaded2 = CmThreaded pcs2 hst2 hit2
- old_linkable = findModuleLinkable oldUI mod_name
- in return (threaded2, Just old_linkable)
-
- -- Compilation really did happen, and succeeded. A new
- -- details, iface and linkable are returned.
- CompOK details (Just (new_iface, new_linkable)) pcs2
- -> let hst2 = addToUFM hst1 mod_name details
- hit2 = addToUFM hit1 mod_name new_iface
- threaded2 = CmThreaded pcs2 hst2 hit2
- in return (threaded2, Just new_linkable)
+ -- Compilation "succeeded", and may or may not have returned a new
+ -- linkable (depending on whether compilation was actually performed
+ -- or not).
+ CompOK pcs2 new_details new_iface maybe_new_linkable
+ -> do let hst2 = addToUFM hst1 mod_name new_details
+ hit2 = addToUFM hit1 mod_name new_iface
+ threaded2 = CmThreaded pcs2 hst2 hit2
+
+ return (threaded2, if isJust maybe_new_linkable
+ then maybe_new_linkable
+ else Just old_linkable)
-- Compilation failed. compile may still have updated
-- the PCS, tho.
CompErrs pcs2
- -> let threaded2 = CmThreaded pcs2 hst1 hit1
- in return (threaded2, Nothing)
-
-
-removeFromTopLevelEnvs :: [ModuleName]
- -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
- -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
-removeFromTopLevelEnvs zap_these (hst, hit, ui)
- = (delListFromUFM hst zap_these,
- delListFromUFM hit zap_these,
- filterModuleLinkables (`notElem` zap_these) ui
+ -> do let threaded2 = CmThreaded pcs2 hst1 hit1
+ return (threaded2, Nothing)
+
+-- Filter modules in the top level envs (HST, HIT, UI).
+retainInTopLevelEnvs :: [ModuleName]
+ -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
+ -> (HomeSymbolTable, HomeIfaceTable, UnlinkedImage)
+retainInTopLevelEnvs keep_these (hst, hit, ui)
+ = (retainInUFM hst keep_these,
+ retainInUFM hit keep_these,
+ filterModuleLinkables (`elem` keep_these) ui
)
+ where
+ retainInUFM :: Uniquable key => UniqFM elt -> [key] -> UniqFM elt
+ retainInUFM ufm keys_to_keep
+ = listToUFM (concatMap (maybeLookupUFM ufm) keys_to_keep)
+ maybeLookupUFM ufm u
+ = case lookupUFM ufm u of Nothing -> []; Just val -> [(u, val)]
+
+-- Needed to clean up HIT and HST so that we don't get duplicates in inst env
+downwards_closure_of_module :: [ModSummary] -> ModuleName -> [ModuleName]
+downwards_closure_of_module summaries root
+ = let toEdge :: ModSummary -> (ModuleName,[ModuleName])
+ toEdge summ = (name_of_summary summ,
+ filter (`elem` all_mods) (ms_allimps summ))
+
+ all_mods = map name_of_summary summaries
+
+ res = simple_transitive_closure (map toEdge summaries) [root]
+ in
+-- trace (showSDoc (text "DC of mod" <+> ppr root
+-- <+> text "=" <+> ppr res)) $
+ res
+
+-- Calculate transitive closures from a set of roots given an adjacency list
+simple_transitive_closure :: Eq a => [(a,[a])] -> [a] -> [a]
+simple_transitive_closure graph set
+ = let set2 = nub (concatMap dsts set ++ set)
+ dsts node = fromMaybe [] (lookup node graph)
+ in
+ if length set == length set2
+ then set
+ else simple_transitive_closure graph set2
+-- Calculate SCCs of the module graph, with or without taking into
+-- account source imports.
topological_sort :: Bool -> [ModSummary] -> [SCC ModSummary]
topological_sort include_source_imports summaries
= let
-- Chase downwards from the specified root set, returning summaries
-- for all home modules encountered. Only follow source-import
--- links.
-downsweep :: [ModuleName] -> IO [ModSummary]
-downsweep rootNm
- = do rootSummaries <- mapM getSummary rootNm
- loop (filter (isModuleInThisPackage.ms_mod) rootSummaries)
+-- links. Also returns a Bool to indicate whether any of the roots
+-- are module Main.
+downsweep :: [FilePath] -> [ModSummary] -> IO ([ModSummary], Bool)
+downsweep rootNm old_summaries
+ = do rootSummaries <- mapM getRootSummary rootNm
+ let a_root_is_Main
+ = any ((=="Main").moduleNameUserString.name_of_summary)
+ rootSummaries
+ all_summaries
+ <- loop (concat (map ms_imps rootSummaries))
+ (mkModuleEnv [ (mod, s) | s <- rootSummaries,
+ let mod = ms_mod s, isHomeModule mod
+ ])
+ return (all_summaries, a_root_is_Main)
where
- getSummary :: ModuleName -> IO ModSummary
+ getRootSummary :: FilePath -> IO ModSummary
+ getRootSummary file
+ | haskellish_src_file file
+ = do exists <- doesFileExist file
+ if exists then summariseFile file else do
+ throwDyn (CmdLineError ("can't find file `" ++ file ++ "'"))
+ | otherwise
+ = do exists <- doesFileExist hs_file
+ if exists then summariseFile hs_file else do
+ exists <- doesFileExist lhs_file
+ if exists then summariseFile lhs_file else do
+ let mod_name = mkModuleName file
+ maybe_summary <- getSummary mod_name
+ case maybe_summary of
+ Nothing -> packageModErr mod_name
+ Just s -> return s
+ where
+ hs_file = file ++ ".hs"
+ lhs_file = file ++ ".lhs"
+
+ getSummary :: ModuleName -> IO (Maybe ModSummary)
getSummary nm
- | trace ("getSummary: "++ showSDoc (ppr nm)) True
= do found <- findModule nm
case found of
- Just (mod, location) -> summarise preprocess mod location
- Nothing -> throwDyn (OtherError
- ("no signs of life for module `"
+ Just (mod, location) -> do
+ let old_summary = findModInSummaries old_summaries mod
+ summarise mod location old_summary
+
+ Nothing -> throwDyn (CmdLineError
+ ("can't find module `"
++ showSDoc (ppr nm) ++ "'"))
-
- -- loop invariant: homeSummaries doesn't contain package modules
- loop :: [ModSummary] -> IO [ModSummary]
- loop homeSummaries
- = do let allImps :: [ModuleName]
- allImps = (nub . concatMap ms_imps) homeSummaries
- let allHome -- all modules currently in homeSummaries
- = map (moduleName.ms_mod) homeSummaries
- let neededImps
- = filter (`notElem` allHome) allImps
- neededSummaries
- <- mapM getSummary neededImps
- let newHomeSummaries
- = filter (isModuleInThisPackage.ms_mod) neededSummaries
- if null newHomeSummaries
- then return homeSummaries
- else loop (newHomeSummaries ++ homeSummaries)
+
+ -- loop invariant: env doesn't contain package modules
+ loop :: [ModuleName] -> ModuleEnv ModSummary -> IO [ModSummary]
+ loop [] env = return (moduleEnvElts env)
+ loop imps env
+ = do -- imports for modules we don't already have
+ let needed_imps = nub (filter (not . (`elemUFM` env)) imps)
+
+ -- summarise them
+ needed_summaries <- mapM getSummary needed_imps
+
+ -- get just the "home" modules
+ let new_home_summaries = [ s | Just s <- needed_summaries ]
+
+ -- loop, checking the new imports
+ let new_imps = concat (map ms_imps new_home_summaries)
+ loop new_imps (extendModuleEnvList env
+ [ (ms_mod s, s) | s <- new_home_summaries ])
+
+-----------------------------------------------------------------------------
+-- Summarising modules
+
+-- We have two types of summarisation:
+--
+-- * Summarise a file. This is used for the root module passed to
+-- cmLoadModule. The file is read, and used to determine the root
+-- module name. The module name may differ from the filename.
+--
+-- * Summarise a module. We are given a module name, and must provide
+-- a summary. The finder is used to locate the file in which the module
+-- resides.
+
+summariseFile :: FilePath -> IO ModSummary
+summariseFile file
+ = do hspp_fn <- preprocess file
+ (srcimps,imps,mod_name) <- getImportsFromFile hspp_fn
+
+ let (path, basename, ext) = splitFilename3 file
+
+ Just (mod, location)
+ <- mkHomeModuleLocn mod_name (path ++ '/':basename) (Just file)
+
+ src_timestamp
+ <- case ml_hs_file location of
+ Nothing -> noHsFileErr mod_name
+ Just src_fn -> getModificationTime src_fn
+
+ return (ModSummary mod
+ location{ml_hspp_file=Just hspp_fn}
+ srcimps imps src_timestamp)
+
+-- Summarise a module, and pick up source and timestamp.
+summarise :: Module -> ModuleLocation -> Maybe ModSummary
+ -> IO (Maybe ModSummary)
+summarise mod location old_summary
+ | not (isHomeModule mod) = return Nothing
+ | otherwise
+ = do let hs_fn = unJust "summarise" (ml_hs_file location)
+
+ case ml_hs_file location of {
+ Nothing -> do {
+ dflags <- getDynFlags;
+ when (verbosity dflags >= 1) $
+ hPutStrLn stderr ("WARNING: module `" ++
+ moduleUserString mod ++ "' has no source file.");
+ return Nothing;
+ };
+
+ Just src_fn -> do
+
+ src_timestamp <- getModificationTime src_fn
+
+ -- return the cached summary if the source didn't change
+ case old_summary of {
+ Just s | ms_hs_date s == src_timestamp -> return (Just s);
+ _ -> do
+
+ hspp_fn <- preprocess hs_fn
+ (srcimps,imps,mod_name) <- getImportsFromFile hspp_fn
+
+ when (mod_name /= moduleName mod) $
+ throwDyn (ProgramError
+ (showSDoc (text hs_fn
+ <> text ": file name does not match module name"
+ <+> quotes (ppr (moduleName mod)))))
+
+ return (Just (ModSummary mod location{ml_hspp_file=Just hspp_fn}
+ srcimps imps src_timestamp))
+ }
+ }
+
+
+noHsFileErr mod
+ = throwDyn (CmdLineError (showSDoc (text "no source file for module" <+> quotes (ppr mod))))
+
+packageModErr mod
+ = throwDyn (CmdLineError (showSDoc (text "module" <+>
+ quotes (ppr mod) <+>
+ text "is a package module")))
\end{code}
projects / ghc-hetmet.git / blobdiff