X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fiface%2FLoadIface.lhs;h=5c7d816ef1c5b18512bb0908e44afd813d5aa531;hp=9c89f18da90c247d5eec8dba85b6569bd8e161ee;hb=c1681a73fa4ca4cf8758264ae387ac09a9e900d8;hpb=f515d87a510f9cd3d416d83e95e6e0f0298f7d18 diff --git a/compiler/iface/LoadIface.lhs b/compiler/iface/LoadIface.lhs index 9c89f18..5c7d816 100644 --- a/compiler/iface/LoadIface.lhs +++ b/compiler/iface/LoadIface.lhs @@ -19,7 +19,7 @@ module LoadIface ( #include "HsVersions.h" import {-# SOURCE #-} TcIface( tcIfaceDecl, tcIfaceRules, tcIfaceInst, - tcIfaceFamInst ) + tcIfaceFamInst, tcIfaceVectInfo ) import DynFlags import IfaceSyn @@ -118,6 +118,7 @@ loadInterfaceForName doc name -- | An 'IfM' function to load the home interface for a wired-in thing, -- so that we're sure that we see its instance declarations and rules +-- See Note [Loading instances] loadWiredInHomeIface :: Name -> IfM lcl () loadWiredInHomeIface name = ASSERT( isWiredInName name ) @@ -134,6 +135,27 @@ loadSysInterface doc mod_name Succeeded iface -> return iface } \end{code} +Note [Loading instances] +~~~~~~~~~~~~~~~~~~~~~~~~ +We need to make sure that we have at least *read* the interface files +for any module with an instance decl or RULE that we might want. + +* If the instance decl is an orphan, we have a whole separate mechanism + (loadOprhanModules) + +* If the instance decl not an orphan, then the act of looking at the + TyCon or Class will force in the defining module for the + TyCon/Class, and hence the instance decl + +* BUT, if the TyCon is a wired-in TyCon, we don't really need its interface; + but we must make sure we read its interface in case it has instances or + rules. That is what LoadIface.loadWiredInHomeInterface does. It's called + from TcIface.{tcImportDecl, checkWiredInTyCon, ifCHeckWiredInThing} + +All of this is done by the type checker. The renamer plays no role. +(It used to, but no longer.) + + %********************************************************* %* * @@ -175,9 +197,9 @@ loadInterface doc_str mod from -- The (src_imp == mi_boot iface) test checks that the already-loaded -- interface isn't a boot iface. This can conceivably happen, -- if an earlier import had a before we got to real imports. I think. - other -> do + other -> do { - { let { hi_boot_file = case from of + let { hi_boot_file = case from of ImportByUser usr_boot -> usr_boot ImportBySystem -> sys_boot @@ -224,7 +246,7 @@ loadInterface doc_str mod from -- -- The main thing is to add the ModIface to the PIT, but -- we also take the - -- IfaceDecls, IfaceInst, IfaceRules + -- IfaceDecls, IfaceInst, IfaceFamInst, IfaceRules, IfaceVectInfo -- out of the ModIface and put them into the big EPS pools -- NB: *first* we do loadDecl, so that the provenance of all the locally-defined @@ -237,13 +259,16 @@ loadInterface doc_str mod from ; new_eps_insts <- mapM tcIfaceInst (mi_insts iface) ; new_eps_fam_insts <- mapM tcIfaceFamInst (mi_fam_insts iface) ; new_eps_rules <- tcIfaceRules ignore_prags (mi_rules iface) + ; new_eps_vect_info <- tcIfaceVectInfo mod (mkNameEnv new_eps_decls) + (mi_vect_info iface) ; let { final_iface = iface { mi_decls = panic "No mi_decls in PIT", mi_insts = panic "No mi_insts in PIT", mi_fam_insts = panic "No mi_fam_insts in PIT", mi_rules = panic "No mi_rules in PIT" - } } + } + } ; updateEps_ $ \ eps -> eps { @@ -255,6 +280,8 @@ loadInterface doc_str mod from new_eps_insts, eps_fam_inst_env = extendFamInstEnvList (eps_fam_inst_env eps) new_eps_fam_insts, + eps_vect_info = plusVectInfo (eps_vect_info eps) + new_eps_vect_info, eps_mod_fam_inst_env = let fam_inst_env = @@ -310,7 +337,7 @@ loadDecl ignore_prags mod (_version, decl) = do { -- Populate the name cache with final versions of all -- the names associated with the decl main_name <- mk_new_bndr mod (ifName decl) - ; traceIf (text "Loading decl for " <> ppr main_name) +-- ; traceIf (text "Loading decl for " <> ppr main_name) ; implicit_names <- mapM (mk_new_bndr mod) (ifaceDeclSubBndrs decl) -- Typecheck the thing, lazily @@ -323,7 +350,27 @@ loadDecl ignore_prags mod (_version, decl) ; thing <- forkM doc $ do { bumpDeclStats main_name ; tcIfaceDecl ignore_prags decl } - -- Populate the type environment with the implicitTyThings too + -- Populate the type environment with the implicitTyThings too. + -- + -- Note [Tricky iface loop] + -- ~~~~~~~~~~~~~~~~~~~~~~~~ + -- The delicate point here is that 'mini-env' should be + -- buildable from 'thing' without demanding any of the things 'forkM'd + -- by tcIfaceDecl. For example + -- class C a where { data T a; op :: T a -> Int } + -- We return the bindings + -- [("C", ), ("T", lookup env "T"), ("op", lookup env "op")] + -- The call (lookup env "T") must return the tycon T without first demanding + -- op; because getting the latter will look up T, hence loop. + -- + -- Of course, there is no reason in principle why (lookup env "T") should demand + -- anything do to with op, but take care: + -- (a) implicitTyThings, and + -- (b) getOccName of all the things returned by implicitThings, + -- must not depend on any of the nested type-checks + -- + -- All a bit too finely-balanced for my liking. + ; let mini_env = mkOccEnv [(getOccName t, t) | t <- implicitTyThings thing] lookup n = case lookupOccEnv mini_env (getOccName n) of Just thing -> thing @@ -342,8 +389,7 @@ loadDecl ignore_prags mod (_version, decl) -- * location -- imported name, to fix the module correctly in the cache mk_new_bndr mod occ - = newGlobalBinder mod occ - (importedSrcLoc (showSDoc (ppr (moduleName mod)))) + = newGlobalBinder mod occ (importedSrcSpan (moduleNameFS (moduleName mod))) -- ToDo: qualify with the package name if necessary doc = ptext SLIT("Declaration for") <+> ppr (ifName decl) @@ -392,18 +438,25 @@ findAndReadIface doc_str mod hi_boot_file -- Look for the file ; hsc_env <- getTopEnv - ; mb_found <- ioToIOEnv (findHiFile hsc_env mod hi_boot_file) + ; mb_found <- ioToIOEnv (findExactModule hsc_env mod) ; case mb_found of { - Failed err -> do + + err | notFound err -> do { traceIf (ptext SLIT("...not found")) ; dflags <- getDOpts ; returnM (Failed (cannotFindInterface dflags (moduleName mod) err)) } ; - - Succeeded file_path -> do + Found loc mod -> do -- Found file, so read it - { traceIf (ptext SLIT("readIFace") <+> text file_path) + { let { file_path = addBootSuffix_maybe hi_boot_file (ml_hi_file loc) } + + ; if thisPackage dflags == modulePackageId mod + && not (isOneShot (ghcMode dflags)) + then returnM (Failed (homeModError mod loc)) + else do { + + ; traceIf (ptext SLIT("readIFace") <+> text file_path) ; read_result <- readIface mod file_path hi_boot_file ; case read_result of Failed err -> returnM (Failed (badIfaceFile file_path err)) @@ -413,18 +466,10 @@ findAndReadIface doc_str mod hi_boot_file | otherwise -> returnM (Succeeded (iface, file_path)) -- Don't forget to fill in the package name... - }}} - -findHiFile :: HscEnv -> Module -> IsBootInterface - -> IO (MaybeErr FindResult FilePath) -findHiFile hsc_env mod hi_boot_file - = do - maybe_found <- findExactModule hsc_env mod - case maybe_found of - Found loc mod -> return (Succeeded path) - where - path = addBootSuffix_maybe hi_boot_file (ml_hi_file loc) - err -> return (Failed err) + }}}} + +notFound (Found _ _) = False +notFound _ = True \end{code} @readIface@ tries just the one file. @@ -470,6 +515,7 @@ initExternalPackageState -- Initialise the EPS rule pool with the built-in rules eps_mod_fam_inst_env = emptyModuleEnv, + eps_vect_info = noVectInfo, eps_stats = EpsStats { n_ifaces_in = 0, n_decls_in = 0, n_decls_out = 0 , n_insts_in = 0, n_insts_out = 0 , n_rules_in = length builtinRules, n_rules_out = 0 } @@ -518,7 +564,7 @@ ifaceStats eps hsep [ int (n_rules_out stats), text "rule decls imported, out of", int (n_rules_in stats), text "read"] ] -\end{code} +\end{code} %************************************************************************ @@ -547,7 +593,8 @@ pprModIface iface <+> ppr (mi_mod_vers iface) <+> pp_sub_vers <+> (if mi_orphan iface then ptext SLIT("[orphan module]") else empty) <+> (if mi_finsts iface then ptext SLIT("[family instance module]") else empty) - <+> int opt_HiVersion + <+> (if mi_hpc iface then ptext SLIT("[hpc]") else empty) + <+> integer opt_HiVersion <+> ptext SLIT("where") , vcat (map pprExport (mi_exports iface)) , pprDeps (mi_deps iface) @@ -557,8 +604,9 @@ pprModIface iface , vcat (map ppr (mi_insts iface)) , vcat (map ppr (mi_fam_insts iface)) , vcat (map ppr (mi_rules iface)) + , pprVectInfo (mi_vect_info iface) , pprDeprecs (mi_deprecs iface) - ] + ] where pp_boot | mi_boot iface = ptext SLIT("[boot]") | otherwise = empty @@ -629,6 +677,17 @@ pprFixities fixes = ptext SLIT("fixities") <+> pprWithCommas pprFix fixes where pprFix (occ,fix) = ppr fix <+> ppr occ +pprVectInfo :: IfaceVectInfo -> SDoc +pprVectInfo (IfaceVectInfo { ifaceVectInfoVar = vars + , ifaceVectInfoTyCon = tycons + , ifaceVectInfoTyConReuse = tyconsReuse + }) = + vcat + [ ptext SLIT("vectorised variables:") <+> hsep (map ppr vars) + , ptext SLIT("vectorised tycons:") <+> hsep (map ppr tycons) + , ptext SLIT("vectorised reused tycons:") <+> hsep (map ppr tyconsReuse) + ] + pprDeprecs NoDeprecs = empty pprDeprecs (DeprecAll txt) = ptext SLIT("Deprecate all") <+> doubleQuotes (ftext txt) pprDeprecs (DeprecSome prs) = ptext SLIT("Deprecate") <+> vcat (map pprDeprec prs) @@ -669,5 +728,12 @@ wrongIfaceModErr iface mod_name file_path ] ] where iface_file = doubleQuotes (text file_path) + +homeModError mod location + = ptext SLIT("attempting to use module ") <> quotes (ppr mod) + <> (case ml_hs_file location of + Just file -> space <> parens (text file) + Nothing -> empty) + <+> ptext SLIT("which is not loaded") \end{code}