X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Fiface%2FLoadIface.lhs;h=8c496f76efcbfe12d315629e66b90fc854fc28c7;hb=9d7da331989abcd1844e9d03b8d1e4163796fa85;hp=a760b83bfdd614365703fc49c106a2d6aca4fa45;hpb=2f17466f56b1f3e0aef92aed1aa7e307a3227515;p=ghc-hetmet.git diff --git a/ghc/compiler/iface/LoadIface.lhs b/ghc/compiler/iface/LoadIface.lhs index a760b83..8c496f7 100644 --- a/ghc/compiler/iface/LoadIface.lhs +++ b/ghc/compiler/iface/LoadIface.lhs @@ -5,59 +5,52 @@ \begin{code} module LoadIface ( - loadHomeInterface, loadInterface, loadDecls, - loadSrcInterface, loadOrphanModules, loadHiBootInterface, - readIface, -- Used when reading the module's old interface - predInstGates, ifaceInstGates, ifaceStats, discardDeclPrags, + loadInterface, loadHomeInterface, loadWiredInHomeIface, + loadSrcInterface, loadSysInterface, loadOrphanModules, + findAndReadIface, readIface, -- Used when reading the module's old interface + loadDecls, ifaceStats, discardDeclPrags, initExternalPackageState ) where #include "HsVersions.h" -import {-# SOURCE #-} TcIface( tcIfaceDecl ) +import {-# SOURCE #-} TcIface( tcIfaceDecl, tcIfaceRule, tcIfaceInst ) import Packages ( PackageState(..), PackageIdH(..), isHomePackage ) -import DriverState ( v_GhcMode, isCompManagerMode ) -import CmdLineOpts ( DynFlags(..), DynFlag( Opt_IgnoreInterfacePragmas ) ) +import DynFlags ( DynFlags(..), DynFlag( Opt_IgnoreInterfacePragmas ), + isOneShot ) import IfaceSyn ( IfaceDecl(..), IfaceConDecl(..), IfaceClassOp(..), - IfaceConDecls(..), IfaceInst(..), IfaceRule(..), - IfaceExpr(..), IfaceTyCon(..), IfaceIdInfo(..), - IfaceType(..), IfacePredType(..), IfaceExtName, - mkIfaceExtName ) -import IfaceEnv ( newGlobalBinder, lookupIfaceExt, lookupIfaceTc, lookupAvail ) + IfaceConDecls(..), IfaceIdInfo(..) ) +import IfaceEnv ( newGlobalBinder ) import HscTypes ( ModIface(..), TyThing, emptyModIface, EpsStats(..), addEpsInStats, ExternalPackageState(..), - PackageTypeEnv, emptyTypeEnv, + PackageTypeEnv, emptyTypeEnv, HscEnv(..), lookupIfaceByModule, emptyPackageIfaceTable, - IsBootInterface, mkIfaceFixCache, Gated, - implicitTyThings, addRulesToPool, addInstsToPool + IsBootInterface, mkIfaceFixCache, + implicitTyThings ) import BasicTypes ( Version, Fixity(..), FixityDirection(..), isMarkedStrict ) -import TcType ( Type, tcSplitTyConApp_maybe ) -import Type ( funTyCon ) import TcRnMonad import PrelNames ( gHC_PRIM ) import PrelInfo ( ghcPrimExports ) import PrelRules ( builtinRules ) -import Rules ( emptyRuleBase ) -import InstEnv ( emptyInstEnv ) +import Rules ( extendRuleBaseList, mkRuleBase ) +import InstEnv ( emptyInstEnv, extendInstEnvList ) import Name ( Name {-instance NamedThing-}, getOccName, - nameModule, isInternalName ) + nameModule, nameIsLocalOrFrom, isWiredInName ) import NameEnv import MkId ( seqId ) import Module ( Module, ModLocation(ml_hi_file), emptyModuleEnv, addBootSuffix_maybe, - extendModuleEnv, lookupModuleEnv, moduleUserString + extendModuleEnv, lookupModuleEnv, moduleString ) import OccName ( OccName, mkOccEnv, lookupOccEnv, mkClassTyConOcc, mkClassDataConOcc, mkSuperDictSelOcc, mkDataConWrapperOcc, mkDataConWorkerOcc ) -import Class ( Class, className ) -import TyCon ( tyConName ) import SrcLoc ( importedSrcLoc ) -import Maybes ( mapCatMaybes, MaybeErr(..) ) +import Maybes ( MaybeErr(..) ) import FastString ( mkFastString ) import ErrUtils ( Message ) import Finder ( findModule, findPackageModule, FindResult(..), cantFindError ) @@ -65,16 +58,14 @@ import Outputable import BinIface ( readBinIface ) import Panic ( ghcError, tryMost, showException, GhcException(..) ) import List ( nub ) - -import DATA_IOREF ( readIORef ) \end{code} %************************************************************************ %* * - loadSrcInterface, loadOrphanModules + loadSrcInterface, loadOrphanModules, loadHomeInterface - These two are called from TcM-land + These three are called from TcM-land %* * %************************************************************************ @@ -83,53 +74,18 @@ loadSrcInterface :: SDoc -> Module -> IsBootInterface -> RnM ModIface -- This is called for each 'import' declaration in the source code -- On a failure, fail in the monad with an error message -loadSrcInterface doc mod_name want_boot - = do { mb_iface <- initIfaceTcRn $ loadInterface doc mod_name - (ImportByUser want_boot) +loadSrcInterface doc mod want_boot + = do { mb_iface <- initIfaceTcRn $ + loadInterface doc mod (ImportByUser want_boot) ; case mb_iface of - Failed err -> failWithTc (elaborate err) + Failed err -> failWithTc (elaborate err) Succeeded iface -> return iface } where elaborate err = hang (ptext SLIT("Failed to load interface for") <+> - quotes (ppr mod_name) <> colon) 4 err - -loadHiBootInterface :: TcRn [Name] --- Load the hi-boot iface for the module being compiled, --- if it indeed exists in the transitive closure of imports --- Return the list of names exported by the hi-boot file -loadHiBootInterface - = do { eps <- getEps - ; mod <- getModule - - ; traceIf (text "loadHiBootInterface" <+> ppr mod) - - -- We're read all the direct imports by now, so eps_is_boot will - -- record if any of our imports mention us by way of hi-boot file - ; case lookupModuleEnv (eps_is_boot eps) mod of { - Nothing -> return [] ; -- The typical case - - Just (_, False) -> -- Someone below us imported us! - -- This is a loop with no hi-boot in the way - failWithTc (moduleLoop mod) ; - - Just (mod_nm, True) -> -- There's a hi-boot interface below us - - - do { -- Load it (into the PTE), and return the exported names - iface <- loadSrcInterface (mk_doc mod_nm) mod_nm True - ; ns_s <- sequenceM [ lookupAvail mod_nm avail - | (mod,avails) <- mi_exports iface, - avail <- avails ] - ; return (concat ns_s) - }}} - where - mk_doc mod = ptext SLIT("Need the hi-boot interface for") <+> ppr mod - <+> ptext SLIT("to compare against the Real Thing") - - moduleLoop mod = ptext SLIT("Circular imports: module") <+> quotes (ppr mod) - <+> ptext SLIT("depends on itself") + quotes (ppr mod) <> colon) 4 err +--------------- loadOrphanModules :: [Module] -> TcM () loadOrphanModules mods | null mods = returnM () @@ -141,21 +97,30 @@ loadOrphanModules mods where load mod = loadSysInterface (mk_doc mod) mod mk_doc mod = ppr mod <+> ptext SLIT("is a orphan-instance module") -\end{code} -%********************************************************* -%* * - loadHomeInterface - Called from Iface-land -%* * -%********************************************************* - -\begin{code} -loadHomeInterface :: SDoc -> Name -> IfM lcl ModIface +--------------- +loadHomeInterface :: SDoc -> Name -> TcRn ModIface loadHomeInterface doc name - = ASSERT2( not (isInternalName name), ppr name <+> parens doc ) - loadSysInterface doc (nameModule name) + = do { +#ifdef DEBUG + -- Should not be called with a name from the module being compiled + this_mod <- getModule + ; ASSERT2( not (nameIsLocalOrFrom this_mod name), ppr name <+> parens doc ) +#endif + initIfaceTcRn $ loadSysInterface doc (nameModule name) + } +--------------- +loadWiredInHomeIface :: Name -> IfM lcl () +-- A 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 +loadWiredInHomeIface name + = ASSERT( isWiredInName name ) + do { loadSysInterface doc (nameModule name); return () } + where + doc = ptext SLIT("Need home interface for wired-in thing") <+> ppr name + +--------------- loadSysInterface :: SDoc -> Module -> IfM lcl ModIface -- A wrapper for loadInterface that Throws an exception if it fails loadSysInterface doc mod_name @@ -179,6 +144,7 @@ loadSysInterface doc mod_name \begin{code} loadInterface :: SDoc -> Module -> WhereFrom -> IfM lcl (MaybeErr Message ModIface) + -- If it can't find a suitable interface file, we -- a) modify the PackageIfaceTable to have an empty entry -- (to avoid repeated complaints) @@ -240,7 +206,7 @@ loadInterface doc_str mod from | otherwise -> let - loc_doc = text file_path <+> colon + loc_doc = text file_path in initIfaceLcl mod loc_doc $ do @@ -262,22 +228,22 @@ loadInterface doc_str mod from ; ignore_prags <- doptM Opt_IgnoreInterfacePragmas ; new_eps_decls <- loadDecls ignore_prags (mi_decls iface) - ; new_eps_insts <- mapM loadInst (mi_insts iface) + ; new_eps_insts <- mapM tcIfaceInst (mi_insts iface) ; new_eps_rules <- if ignore_prags then return [] - else mapM loadRule (mi_rules iface) + else mapM tcIfaceRule (mi_rules iface) ; let { final_iface = iface { mi_decls = panic "No mi_decls in PIT", mi_insts = panic "No mi_insts in PIT", mi_rules = panic "No mi_rules in PIT" } } ; updateEps_ $ \ eps -> - eps { eps_PIT = extendModuleEnv (eps_PIT eps) mod final_iface, - eps_PTE = addDeclsToPTE (eps_PTE eps) new_eps_decls, - eps_rules = addRulesToPool (eps_rules eps) new_eps_rules, - eps_insts = addInstsToPool (eps_insts eps) new_eps_insts, - eps_stats = addEpsInStats (eps_stats eps) (length new_eps_decls) - (length new_eps_insts) (length new_eps_rules) } + eps { eps_PIT = extendModuleEnv (eps_PIT eps) mod final_iface, + eps_PTE = addDeclsToPTE (eps_PTE eps) new_eps_decls, + eps_rule_base = extendRuleBaseList (eps_rule_base eps) new_eps_rules, + eps_inst_env = extendInstEnvList (eps_inst_env eps) new_eps_insts, + eps_stats = addEpsInStats (eps_stats eps) (length new_eps_decls) + (length new_eps_insts) (length new_eps_rules) } ; return (Succeeded final_iface) }}}} @@ -346,7 +312,7 @@ loadDecl ignore_prags mod (_version, decl) -- imported name, to fix the module correctly in the cache mk_new_bndr mod mb_parent occ = newGlobalBinder mod occ mb_parent - (importedSrcLoc (moduleUserString mod)) + (importedSrcLoc (moduleString mod)) doc = ptext SLIT("Declaration for") <+> ppr (ifName decl) @@ -363,7 +329,7 @@ bumpDeclStats name ----------------- ifaceDeclSubBndrs :: IfaceDecl -> [OccName] --- *Excludes* the 'main' name, but *includes* the implicitly-bound names +-- *Excludes* the 'main' name, but *includes* the implicitly-bound names -- Deeply revolting, because it has to predict what gets bound, -- especially the question of whether there's a wrapper for a datacon @@ -388,7 +354,7 @@ ifaceDeclSubBndrs (IfaceData {ifCons = IfNewTyCon (IfVanillaCon { ifConOcc = con = fields ++ [con_occ, mkDataConWrapperOcc con_occ] -- Wrapper, no worker; see MkId.mkDataConIds -ifaceDeclSubBndrs (IfaceData {ifCons = IfDataTyCon _ cons}) +ifaceDeclSubBndrs (IfaceData {ifCons = IfDataTyCon cons}) = nub (concatMap fld_occs cons) -- Eliminate duplicate fields ++ concatMap dc_occs cons where @@ -407,136 +373,6 @@ ifaceDeclSubBndrs (IfaceData {ifCons = IfDataTyCon _ cons}) ifaceDeclSubBndrs _other = [] ------------------------------------------------------ --- Loading instance decls ------------------------------------------------------ - -loadInst :: IfaceInst -> IfL (Name, Gated IfaceInst) - -loadInst decl@(IfaceInst {ifInstHead = inst_ty}) - = do { - -- Find out what type constructors and classes are "gates" for the - -- instance declaration. If all these "gates" are slurped in then - -- we should slurp the instance decl too. - -- - -- We *don't* want to count names in the context part as gates, though. - -- For example: - -- instance Foo a => Baz (T a) where ... - -- - -- Here the gates are Baz and T, but *not* Foo. - -- - -- HOWEVER: functional dependencies make things more complicated - -- class C a b | a->b where ... - -- instance C Foo Baz where ... - -- Here, the gates are really only C and Foo, *not* Baz. - -- That is, if C and Foo are visible, even if Baz isn't, we must - -- slurp the decl. - -- - -- Rather than take fundeps into account "properly", we just slurp - -- if C is visible and *any one* of the Names in the types - -- This is a slightly brutal approximation, but most instance decls - -- are regular H98 ones and it's perfect for them. - -- - -- NOTICE that we rename the type before extracting its free - -- variables. The free-variable finder for a renamed HsType - -- does the Right Thing for built-in syntax like [] and (,). - let { (cls_ext, tc_exts) = ifaceInstGates inst_ty } - ; cls <- lookupIfaceExt cls_ext - ; tcs <- mapM lookupIfaceTc tc_exts - ; (mod, doc) <- getIfCtxt - ; returnM (cls, (tcs, (mod, doc, decl))) - } - ------------------------------------------------------ --- Loading Rules ------------------------------------------------------ - -loadRule :: IfaceRule -> IfL (Gated IfaceRule) --- "Gate" the rule simply by a crude notion of the free vars of --- the LHS. It can be crude, because having too few free vars is safe. -loadRule decl@(IfaceRule {ifRuleHead = fn, ifRuleArgs = args}) - = do { names <- mapM lookupIfaceExt (fn : arg_fvs) - ; (mod, doc) <- getIfCtxt - ; returnM (names, (mod, doc, decl)) } - where - arg_fvs = [n | arg <- args, n <- crudeIfExprGblFvs arg] - - ---------------------------- -crudeIfExprGblFvs :: IfaceExpr -> [IfaceExtName] --- A crude approximation to the free external names of an IfExpr --- Returns a subset of the true answer -crudeIfExprGblFvs (IfaceType ty) = get_tcs ty -crudeIfExprGblFvs (IfaceExt v) = [v] -crudeIfExprGblFvs other = [] -- Well, I said it was crude - -get_tcs :: IfaceType -> [IfaceExtName] --- Get a crude subset of the TyCons of an IfaceType -get_tcs (IfaceTyVar _) = [] -get_tcs (IfaceAppTy t1 t2) = get_tcs t1 ++ get_tcs t2 -get_tcs (IfaceFunTy t1 t2) = get_tcs t1 ++ get_tcs t2 -get_tcs (IfaceForAllTy _ t) = get_tcs t -get_tcs (IfacePredTy st) = case st of - IfaceClassP cl ts -> get_tcs_s ts - IfaceIParam _ t -> get_tcs t -get_tcs (IfaceTyConApp (IfaceTc tc) ts) = tc : get_tcs_s ts -get_tcs (IfaceTyConApp other ts) = get_tcs_s ts - --- The lists are always small => appending is fine -get_tcs_s :: [IfaceType] -> [IfaceExtName] -get_tcs_s tys = foldr ((++) . get_tcs) [] tys - - ----------------- -getIfCtxt :: IfL (Module, SDoc) -getIfCtxt = do { env <- getLclEnv; return (if_mod env, if_loc env) } -\end{code} - - -%********************************************************* -%* * - Gating -%* * -%********************************************************* - -Extract the gates of an instance declaration - -\begin{code} -ifaceInstGates :: IfaceType -> (IfaceExtName, [IfaceTyCon]) --- Return the class, and the tycons mentioned in the rest of the head --- We only pick the TyCon at the root of each type, to avoid --- difficulties with overlap. For example, suppose there are interfaces --- in the pool for --- C Int b --- C a [b] --- C a [T] --- Then, if we are trying to resolve (C Int x), we need the first --- if we are trying to resolve (C x [y]), we need *both* the latter --- two, even though T is not involved yet, so that we spot the overlap - -ifaceInstGates (IfaceForAllTy _ t) = ifaceInstGates t -ifaceInstGates (IfaceFunTy _ t) = ifaceInstGates t -ifaceInstGates (IfacePredTy (IfaceClassP cls tys)) = (cls, instHeadTyconGates tys) -ifaceInstGates other = pprPanic "ifaceInstGates" (ppr other) - -- The other cases should not happen - -instHeadTyconGates tys = mapCatMaybes root_tycon tys - where - root_tycon (IfaceFunTy _ _) = Just (IfaceTc funTyConExtName) - root_tycon (IfaceTyConApp tc _) = Just tc - root_tycon other = Nothing - -funTyConExtName = mkIfaceExtName (tyConName funTyCon) - - -predInstGates :: Class -> [Type] -> (Name, [Name]) --- The same function, only this time on the predicate found in a dictionary -predInstGates cls tys - = (className cls, mapCatMaybes root_tycon tys) - where - root_tycon ty = case tcSplitTyConApp_maybe ty of - Just (tc, _) -> Just (tyConName tc) - Nothing -> Nothing \end{code} @@ -551,7 +387,7 @@ findAndReadIface :: Bool -- True <=> explicit user import -> SDoc -> Module -> IsBootInterface -- True <=> Look for a .hi-boot file -- False <=> Look for .hi file - -> IfM lcl (MaybeErr Message (ModIface, FilePath)) + -> TcRnIf gbl lcl (MaybeErr Message (ModIface, FilePath)) -- Nothing <=> file not found, or unreadable, or illegible -- Just x <=> successfully found and parsed @@ -576,7 +412,8 @@ findAndReadIface explicit doc_str mod_name hi_boot_file else do -- Look for the file - ; mb_found <- ioToIOEnv (findHiFile dflags explicit mod_name hi_boot_file) + ; hsc_env <- getTopEnv + ; mb_found <- ioToIOEnv (findHiFile hsc_env explicit mod_name hi_boot_file) ; case mb_found of { Failed err -> do { traceIf (ptext SLIT("...not found")) @@ -598,20 +435,19 @@ findAndReadIface explicit doc_str mod_name hi_boot_file -- Don't forget to fill in the package name... }}} -findHiFile :: DynFlags -> Bool -> Module -> IsBootInterface +findHiFile :: HscEnv -> Bool -> Module -> IsBootInterface -> IO (MaybeErr FindResult (FilePath, PackageIdH)) -findHiFile dflags explicit mod_name hi_boot_file +findHiFile hsc_env explicit mod_name hi_boot_file = do { -- In interactive or --make mode, we are *not allowed* to demand-load -- a home package .hi file. So don't even look for them. -- This helps in the case where you are sitting in eg. ghc/lib/std -- and start up GHCi - it won't complain that all the modules it tries -- to load are found in the home location. - ghci_mode <- readIORef v_GhcMode ; - let { home_allowed = not (isCompManagerMode ghci_mode) } ; + let { home_allowed = isOneShot (ghcMode (hsc_dflags hsc_env)) } ; maybe_found <- if home_allowed - then findModule dflags mod_name explicit - else findPackageModule dflags mod_name explicit; + then findModule hsc_env mod_name explicit + else findPackageModule hsc_env mod_name explicit; case maybe_found of Found loc pkg -> return (Succeeded (path, pkg)) @@ -626,7 +462,7 @@ findHiFile dflags explicit mod_name hi_boot_file \begin{code} readIface :: Module -> String -> IsBootInterface - -> IfM lcl (MaybeErr Message ModIface) + -> TcRnIf gbl lcl (MaybeErr Message ModIface) -- Failed err <=> file not found, or unreadable, or illegible -- Succeeded iface <=> successfully found and parsed @@ -661,18 +497,12 @@ initExternalPackageState eps_PIT = emptyPackageIfaceTable, eps_PTE = emptyTypeEnv, eps_inst_env = emptyInstEnv, - eps_rule_base = emptyRuleBase, - eps_insts = emptyNameEnv, - eps_rules = addRulesToPool [] (map mk_gated_rule builtinRules), + eps_rule_base = mkRuleBase builtinRules, -- Initialise the EPS rule pool with the built-in rules 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 } } - where - mk_gated_rule (fn_name, core_rule) - = ([fn_name], (nameModule fn_name, ptext SLIT(""), - IfaceBuiltinRule (mkIfaceExtName fn_name) core_rule)) \end{code}