X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcEnv.lhs;h=809abce82d5344e73ae46488eab5248496aa9d62;hb=788faebb40b51d37e73ed94dfc99460d39a1a811;hp=896d581eb66dcdaca3255d8714996c443ef828e8;hpb=26741ec416bae2c502ef00a2ba0e79050a32cb67;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcEnv.lhs b/ghc/compiler/typecheck/TcEnv.lhs index 896d581..809abce 100644 --- a/ghc/compiler/typecheck/TcEnv.lhs +++ b/ghc/compiler/typecheck/TcEnv.lhs @@ -1,222 +1,485 @@ \begin{code} -#include "HsVersions.h" - module TcEnv( - TcEnv, + TcId, TcIdSet, + TyThing(..), TyThingDetails(..), TcTyThing(..), - initEnv, getEnv_LocalIds, getEnv_TyCons, getEnv_Classes, + -- Getting stuff from the environment + TcEnv, initTcEnv, + tcEnvTyCons, tcEnvClasses, tcEnvIds, tcEnvTcIds, tcEnvTyVars, + getTcGEnv, - tcTyVarScope, tcTyVarScopeGivenKinds, tcLookupTyVar, + -- Instance environment, and InstInfo type + tcGetInstEnv, tcSetInstEnv, + InstInfo(..), pprInstInfo, + simpleInstInfoTy, simpleInstInfoTyCon, + + -- Global environment + tcExtendGlobalEnv, tcExtendGlobalValEnv, tcExtendGlobalTypeEnv, + tcLookupTyCon, tcLookupClass, tcLookupGlobalId, tcLookupDataCon, + tcLookupGlobal_maybe, tcLookupGlobal, tcLookupSyntaxId, tcLookupSyntaxName, - tcExtendTyConEnv, tcLookupTyCon, tcLookupTyConByKey, - tcExtendClassEnv, tcLookupClass, tcLookupClassByKey, - tcGetTyConsAndClasses, + -- Local environment + tcExtendKindEnv, tcLookupLocalIds, + tcExtendTyVarEnv, tcExtendTyVarEnvForMeths, + tcExtendLocalValEnv, tcLookup, tcLookup_maybe, tcLookupId, - tcExtendGlobalValEnv, tcExtendLocalValEnv, - tcLookupLocalValue, tcLookupLocalValueOK, tcLookupLocalValueByKey, - tcLookupGlobalValue, tcLookupGlobalValueByKey, + -- Global type variables + tcGetGlobalTyVars, tcExtendGlobalTyVars, - newMonoIds, newLocalIds, newLocalId, - tcGetGlobalTyVars, tcExtendGlobalTyVars + -- Random useful things + RecTcEnv, tcAddImportedIdInfo, tcLookupRecId, tcLookupRecId_maybe, + + -- New Ids + newLocalId, newSpecPragmaId, + newDFunName, + + -- Misc + isLocalThing, tcSetEnv ) where +#include "HsVersions.h" -IMP_Ubiq() -IMPORT_DELOOPER(TcMLoop) -- for paranoia checking - -import Id ( SYN_IE(Id), GenId, idType, mkUserLocal ) -import TcHsSyn ( TcIdBndr(..), TcIdOcc(..) ) -import TcKind ( TcKind, newKindVars, tcDefaultKind, kindToTcKind ) -import TcType ( TcType(..), TcMaybe, TcTyVar(..), TcTyVarSet(..), - newTyVarTys, tcInstTyVars, zonkTcTyVars - ) -import TyVar ( mkTyVar, tyVarKind, unionTyVarSets, emptyTyVarSet ) -import Type ( tyVarsOfTypes ) -import TyCon ( TyCon, tyConKind, synTyConArity ) -import Class ( SYN_IE(Class), GenClass, classSig ) - -import TcMonad hiding ( rnMtoTcM ) - -import Name ( getOccName, getSrcLoc, Name{-instance NamedThing-} ) -import PprStyle -import Pretty -import RnHsSyn ( RnName(..) ) -import Type ( splitForAllTy ) -import Unique ( pprUnique10, pprUnique{-ToDo:rm-} ) -import UniqFM -import Util ( zipEqual, zipWithEqual, zipWith3Equal, zipLazy, - panic, pprPanic, pprTrace{-ToDo:rm-} +import RnHsSyn ( RenamedMonoBinds, RenamedSig ) +import TcMonad +import TcType ( TcKind, TcType, TcTyVar, TcTyVarSet, + zonkTcTyVarsAndFV ) +import Id ( idName, mkSpecPragmaId, mkUserLocal, isDataConWrapId_maybe ) +import IdInfo ( vanillaIdInfo ) +import Var ( TyVar, Id, idType, lazySetIdInfo, idInfo ) +import VarSet +import Type ( Type, ThetaType, + tyVarsOfTypes, splitDFunTy, + getDFunTyKey, tyConAppTyCon + ) +import DataCon ( DataCon ) +import TyCon ( TyCon ) +import Class ( Class, ClassOpItem ) +import Name ( Name, OccName, NamedThing(..), + nameOccName, getSrcLoc, mkLocalName, isLocalName, + nameIsLocalOrFrom + ) +import NameEnv ( NameEnv, lookupNameEnv, nameEnvElts, + extendNameEnvList, emptyNameEnv, plusNameEnv ) +import OccName ( mkDFunOcc, occNameString ) +import HscTypes ( DFunId, + PackageTypeEnv, TypeEnv, + extendTypeEnvList, extendTypeEnvWithIds, + typeEnvTyCons, typeEnvClasses, typeEnvIds, + HomeSymbolTable + ) +import Module ( Module ) +import InstEnv ( InstEnv, emptyInstEnv ) +import HscTypes ( lookupType, TyThing(..) ) +import Util ( zipEqual ) +import SrcLoc ( SrcLoc ) +import qualified PrelNames +import Outputable + +import IOExts ( newIORef ) \end{code} -Data type declarations -~~~~~~~~~~~~~~~~~~~~~ +%************************************************************************ +%* * +\subsection{TcEnv} +%* * +%************************************************************************ \begin{code} -data TcEnv s = TcEnv - (TyVarEnv s) - (TyConEnv s) - (ClassEnv s) - (ValueEnv Id) -- Globals - (ValueEnv (TcIdBndr s)) -- Locals - (MutableVar s (TcTyVarSet s)) -- Free type variables of locals - -- ...why mutable? see notes with tcGetGlobalTyVars - -type TyVarEnv s = UniqFM (TcKind s, TyVar) -type TyConEnv s = UniqFM (TcKind s, Maybe Arity, TyCon) -- Arity present for Synonyms only -type ClassEnv s = UniqFM (TcKind s, Class) -type ValueEnv id = UniqFM id - -initEnv :: MutableVar s (TcTyVarSet s) -> TcEnv s -initEnv mut = TcEnv emptyUFM emptyUFM emptyUFM emptyUFM emptyUFM mut - -getEnv_LocalIds (TcEnv _ _ _ _ ls _) = eltsUFM ls -getEnv_TyCons (TcEnv _ ts _ _ _ _) = [tycon | (_, _, tycon) <- eltsUFM ts] -getEnv_Classes (TcEnv _ _ cs _ _ _) = [clas | (_, clas) <- eltsUFM cs] +type TcId = Id -- Type may be a TcType +type TcIdSet = IdSet + +data TcEnv + = TcEnv { + tcSyntaxMap :: PrelNames.SyntaxMap, -- The syntax map (usually the identity) + + tcGST :: Name -> Maybe TyThing, -- The type environment at the moment we began this compilation + + tcInsts :: InstEnv, -- All instances (both imported and in this module) + + tcGEnv :: TypeEnv, -- The global type environment we've accumulated while + {- NameEnv TyThing-} -- compiling this module: + -- types and classes (both imported and local) + -- imported Ids + -- (Ids defined in this module start in the local envt, + -- though they move to the global envt during zonking) + + tcLEnv :: NameEnv TcTyThing, -- The local type environment: Ids and TyVars + -- defined in this module + + tcTyVars :: TcRef TcTyVarSet -- The "global tyvars" + -- Namely, the in-scope TyVars bound in tcLEnv, plus the tyvars + -- mentioned in the types of Ids bound in tcLEnv + -- Why mutable? see notes with tcGetGlobalTyVars + } + \end{code} -Making new TcTyVars, with knot tying! -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +The Global-Env/Local-Env story +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +During type checking, we keep in the GlobalEnv + * All types and classes + * All Ids derived from types and classes (constructors, selectors) + * Imported Ids + +At the end of type checking, we zonk the local bindings, +and as we do so we add to the GlobalEnv + * Locally defined top-level Ids + +Why? Because they are now Ids not TcIds. This final GlobalEnv is +used thus: + a) fed back (via the knot) to typechecking the + unfoldings of interface signatures + + b) used to augment the GlobalSymbolTable + + \begin{code} -tcTyVarScopeGivenKinds - :: [Name] -- Names of some type variables - -> [TcKind s] - -> ([TyVar] -> TcM s a) -- Thing to type check in their scope - -> TcM s a -- Result - -tcTyVarScopeGivenKinds names kinds thing_inside - = fixTc (\ ~(rec_tyvars, _) -> - -- Ok to look at names, kinds, but not tyvars! - - tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - let - tve' = addListToUFM tve (zipEqual "tcTyVarScopeGivenKinds" names (kinds `zipLazy` rec_tyvars)) - in - tcSetEnv (TcEnv tve' tce ce gve lve gtvs) - (thing_inside rec_tyvars) `thenTc` \ result -> - - -- Get the tyvar's Kinds from their TcKinds - mapNF_Tc tcDefaultKind kinds `thenNF_Tc` \ kinds' -> - - -- Construct the real TyVars - let - tyvars = zipWithEqual "tcTyVarScopeGivenKinds" mkTyVar names kinds' - in - returnTc (tyvars, result) - ) `thenTc` \ (_,result) -> - returnTc result - -tcTyVarScope names thing_inside - = newKindVars (length names) `thenNF_Tc` \ kinds -> - tcTyVarScopeGivenKinds names kinds thing_inside +data TcTyThing + = AGlobal TyThing -- Used only in the return type of a lookup + | ATcId TcId -- Ids defined in this module + | ATyVar TyVar -- Type variables + | AThing TcKind -- Used temporarily, during kind checking +-- Here's an example of how the AThing guy is used +-- Suppose we are checking (forall a. T a Int): +-- 1. We first bind (a -> AThink kv), where kv is a kind variable. +-- 2. Then we kind-check the (T a Int) part. +-- 3. Then we zonk the kind variable. +-- 4. Now we know the kind for 'a', and we add (a -> ATyVar a::K) to the environment + +initTcEnv :: PrelNames.SyntaxMap -> HomeSymbolTable -> PackageTypeEnv -> IO TcEnv +initTcEnv syntax_map hst pte + = do { gtv_var <- newIORef emptyVarSet ; + return (TcEnv { tcSyntaxMap = syntax_map, + tcGST = lookup, + tcGEnv = emptyNameEnv, + tcInsts = emptyInstEnv, + tcLEnv = emptyNameEnv, + tcTyVars = gtv_var + })} + where + lookup name | isLocalName name = Nothing + | otherwise = lookupType hst pte name + + +tcEnvClasses env = typeEnvClasses (tcGEnv env) +tcEnvTyCons env = typeEnvTyCons (tcGEnv env) +tcEnvIds env = typeEnvIds (tcGEnv env) +tcEnvTyVars env = [tv | ATyVar tv <- nameEnvElts (tcLEnv env)] +tcEnvTcIds env = [id | ATcId id <- nameEnvElts (tcLEnv env)] + +getTcGEnv (TcEnv { tcGEnv = genv }) = genv + +-- This data type is used to help tie the knot +-- when type checking type and class declarations +data TyThingDetails = SynTyDetails Type + | DataTyDetails ThetaType [DataCon] [Id] + | ClassDetails ThetaType [Id] [ClassOpItem] DataCon +\end{code} + + +%************************************************************************ +%* * +\subsection{Basic lookups} +%* * +%************************************************************************ + +\begin{code} +lookup_global :: TcEnv -> Name -> Maybe TyThing + -- Try the global envt and then the global symbol table +lookup_global env name + = case lookupNameEnv (tcGEnv env) name of + Just thing -> Just thing + Nothing -> tcGST env name + +lookup_local :: TcEnv -> Name -> Maybe TcTyThing + -- Try the local envt and then try the global +lookup_local env name + = case lookupNameEnv (tcLEnv env) name of + Just thing -> Just thing + Nothing -> case lookup_global env name of + Just thing -> Just (AGlobal thing) + Nothing -> Nothing \end{code} +\begin{code} +type RecTcEnv = TcEnv +-- This environment is used for getting the 'right' IdInfo +-- on imported things and for looking up Ids in unfoldings +-- The environment doesn't have any local Ids in it + +tcAddImportedIdInfo :: RecTcEnv -> Id -> Id +tcAddImportedIdInfo env id + = id `lazySetIdInfo` new_info + -- The Id must be returned without a data dependency on maybe_id + where + new_info = case tcLookupRecId_maybe env (idName id) of + Nothing -> pprTrace "tcAddIdInfo" (ppr id) vanillaIdInfo + Just imported_id -> idInfo imported_id + -- ToDo: could check that types are the same + +tcLookupRecId_maybe :: RecTcEnv -> Name -> Maybe Id +tcLookupRecId_maybe env name = case lookup_global env name of + Just (AnId id) -> Just id + other -> Nothing + +tcLookupRecId :: RecTcEnv -> Name -> Id +tcLookupRecId env name = case lookup_global env name of + Just (AnId id) -> id + Nothing -> pprPanic "tcLookupRecId" (ppr name) +\end{code} -The Kind, TyVar, Class and TyCon envs -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +%************************************************************************ +%* * +\subsection{Making new Ids} +%* * +%************************************************************************ -Extending the environments. Notice the uses of @zipLazy@, which makes sure -that the knot-tied TyVars, TyCons and Classes aren't looked at too early. +Constructing new Ids \begin{code} -tcExtendTyConEnv :: [(RnName,Maybe Arity)] -> [TyCon] -> TcM s r -> TcM s r +newLocalId :: OccName -> TcType -> SrcLoc -> NF_TcM TcId +newLocalId name ty loc + = tcGetUnique `thenNF_Tc` \ uniq -> + returnNF_Tc (mkUserLocal name uniq ty loc) + +newSpecPragmaId :: Name -> TcType -> NF_TcM TcId +newSpecPragmaId name ty + = tcGetUnique `thenNF_Tc` \ uniq -> + returnNF_Tc (mkSpecPragmaId (nameOccName name) uniq ty (getSrcLoc name)) +\end{code} -tcExtendTyConEnv names_w_arities tycons scope - = newKindVars (length names_w_arities) `thenNF_Tc` \ kinds -> - tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> +Make a name for the dict fun for an instance decl. +It's a *local* name for the moment. The CoreTidy pass +will globalise it. + +\begin{code} +newDFunName :: Class -> [Type] -> SrcLoc -> NF_TcM Name +newDFunName clas (ty:_) loc + = tcGetUnique `thenNF_Tc` \ uniq -> + returnNF_Tc (mkLocalName uniq (mkDFunOcc dfun_string) loc) + where + -- Any string that is somewhat unique will do + dfun_string = occNameString (getOccName clas) ++ occNameString (getDFunTyKey ty) + +newDFunName clas [] loc = pprPanic "newDFunName" (ppr clas <+> ppr loc) +\end{code} + +\begin{code} +isLocalThing :: NamedThing a => Module -> a -> Bool +isLocalThing mod thing = nameIsLocalOrFrom mod (getName thing) +\end{code} + +%************************************************************************ +%* * +\subsection{The global environment} +%* * +%************************************************************************ + +\begin{code} +tcExtendGlobalEnv :: [TyThing] -> TcM r -> TcM r +tcExtendGlobalEnv things thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - tce' = addListToUFM tce [ (name, (kind, arity, tycon)) - | ((name,arity), (kind,tycon)) - <- zipEqual "tcExtendTyConEnv" names_w_arities (kinds `zipLazy` tycons) - ] + ge' = extendTypeEnvList (tcGEnv env) things in - tcSetEnv (TcEnv tve tce' ce gve lve gtvs) scope `thenTc` \ result -> - mapNF_Tc tcDefaultKind kinds `thenNF_Tc_` - returnTc result + tcSetEnv (env {tcGEnv = ge'}) thing_inside -tcExtendClassEnv :: [RnName] -> [Class] -> TcM s r -> TcM s r -tcExtendClassEnv names classes scope - = newKindVars (length names) `thenNF_Tc` \ kinds -> - tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> +tcExtendGlobalTypeEnv :: TypeEnv -> TcM r -> TcM r +tcExtendGlobalTypeEnv extra_env thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - ce' = addListToUFM ce (zipEqual "tcExtendClassEnv" names (kinds `zipLazy` classes)) + ge' = tcGEnv env `plusNameEnv` extra_env in - tcSetEnv (TcEnv tve tce ce' gve lve gtvs) scope `thenTc` \ result -> - mapNF_Tc tcDefaultKind kinds `thenNF_Tc_` - returnTc result -\end{code} + tcSetEnv (env {tcGEnv = ge'}) thing_inside +tcExtendGlobalValEnv :: [Id] -> TcM a -> TcM a +tcExtendGlobalValEnv ids thing_inside + = tcGetEnv `thenNF_Tc` \ env -> + let + ge' = extendTypeEnvWithIds (tcGEnv env) ids + in + tcSetEnv (env {tcGEnv = ge'}) thing_inside +\end{code} -Looking up in the environments. \begin{code} -tcLookupTyVar name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupWithDefaultUFM tve (pprPanic "tcLookupTyVar:" (ppr PprShowAll name)) name) +tcLookupGlobal_maybe :: Name -> NF_TcM (Maybe TyThing) +tcLookupGlobal_maybe name + = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (lookup_global env name) +\end{code} +A variety of global lookups, when we know what we are looking for. -tcLookupTyCon (WiredInTyCon tc) -- wired in tycons - = returnNF_Tc (kindToTcKind (tyConKind tc), synTyConArity tc, tc) +\begin{code} +tcLookupGlobal :: Name -> NF_TcM TyThing +tcLookupGlobal name + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_thing -> + case maybe_thing of + Just thing -> returnNF_Tc thing + other -> notFound "tcLookupGlobal" name + +tcLookupGlobalId :: Name -> NF_TcM Id +tcLookupGlobalId name + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_id -> + case maybe_id of + Just (AnId id) -> returnNF_Tc id + other -> notFound "tcLookupGlobalId" name + +tcLookupDataCon :: Name -> TcM DataCon +tcLookupDataCon con_name + = tcLookupGlobalId con_name `thenNF_Tc` \ con_id -> + case isDataConWrapId_maybe con_id of + Just data_con -> returnTc data_con + Nothing -> failWithTc (badCon con_id) -tcLookupTyCon name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupWithDefaultUFM tce (pprPanic "tcLookupTyCon:" (ppr PprShowAll name)) name) - -tcLookupTyConByKey uniq - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - let - (kind, arity, tycon) = lookupWithDefaultUFM_Directly tce - (pprPanic "tcLookupTyCon:" (pprUnique10 uniq)) - uniq - in - returnNF_Tc tycon +tcLookupClass :: Name -> NF_TcM Class tcLookupClass name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> --- pprTrace "tcLookupClass:" (ppCat [ppStr "Uniq:", pprUnique10 (uniqueOf name), ppStr "; avail:", ppCat (map (pprUnique10 . fst) (ufmToList ce))]) $ --- pprTrace "tcLookupClass:" (ppCat [ppStr "Uniq:", pprUnique (uniqueOf name), ppStr "; avail:", ppCat (map (pprUnique . fst) (ufmToList ce))]) $ - returnNF_Tc (lookupWithDefaultUFM ce (pprPanic "tcLookupClass:" (ppr PprShowAll name)) name) + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_clas -> + case maybe_clas of + Just (AClass clas) -> returnNF_Tc clas + other -> notFound "tcLookupClass" name + +tcLookupTyCon :: Name -> NF_TcM TyCon +tcLookupTyCon name + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_tc -> + case maybe_tc of + Just (ATyCon tc) -> returnNF_Tc tc + other -> notFound "tcLookupTyCon" name + +tcLookupId :: Name -> NF_TcM Id +tcLookupId name + = tcLookup name `thenNF_Tc` \ thing -> + case thing of + ATcId tc_id -> returnNF_Tc tc_id + AGlobal (AnId id) -> returnNF_Tc id + other -> pprPanic "tcLookupId" (ppr name) + +tcLookupLocalIds :: [Name] -> NF_TcM [TcId] +tcLookupLocalIds ns + = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (map (lookup (tcLEnv env)) ns) + where + lookup lenv name = case lookupNameEnv lenv name of + Just (ATcId id) -> id + other -> pprPanic "tcLookupLocalIds" (ppr name) + +tcLookupSyntaxId :: Name -> NF_TcM Id +-- Lookup a name like PrelNum.fromInt, and return the corresponding Id, +-- after mapping through the SyntaxMap. This may give us the Id for +-- (say) MyPrelude.fromInteger +tcLookupSyntaxId name + = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (case lookup_global env (tcSyntaxMap env name) of + Just (AnId id) -> id + other -> pprPanic "tcLookupSyntaxId" (ppr name)) + +tcLookupSyntaxName :: Name -> NF_TcM Name +tcLookupSyntaxName name + = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (tcSyntaxMap env name) +\end{code} -tcLookupClassByKey uniq - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - let - (kind, clas) = lookupWithDefaultUFM_Directly ce - (pprPanic "tcLookupClassByKey:" (pprUnique10 uniq)) - uniq - in - returnNF_Tc clas -tcGetTyConsAndClasses :: NF_TcM s ([TyCon], [Class]) -tcGetTyConsAndClasses - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc ([tc | (_, _, tc) <- eltsUFM tce], - [c | (_, c) <- eltsUFM ce]) -\end{code} +%************************************************************************ +%* * +\subsection{The local environment} +%* * +%************************************************************************ +\begin{code} +tcLookup_maybe :: Name -> NF_TcM (Maybe TcTyThing) +tcLookup_maybe name + = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (lookup_local env name) + +tcLookup :: Name -> NF_TcM TcTyThing +tcLookup name + = tcLookup_maybe name `thenNF_Tc` \ maybe_thing -> + case maybe_thing of + Just thing -> returnNF_Tc thing + other -> notFound "tcLookup" name + -- Extract the IdInfo from an IfaceSig imported from an interface file +\end{code} -Extending and consulting the value environment -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \begin{code} -tcExtendGlobalValEnv ids scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> +tcExtendKindEnv :: [(Name,TcKind)] -> TcM r -> TcM r +tcExtendKindEnv pairs thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - gve' = addListToUFM_Directly gve [(uniqueOf id, id) | id <- ids] + le' = extendNameEnvList (tcLEnv env) [(n, AThing k) | (n,k) <- pairs] + -- No need to extend global tyvars for kind checking in - tcSetEnv (TcEnv tve tce ce gve' lve gtvs) scope + tcSetEnv (env {tcLEnv = le'}) thing_inside + +tcExtendTyVarEnv :: [TyVar] -> TcM r -> TcM r +tcExtendTyVarEnv tyvars thing_inside + = tcGetEnv `thenNF_Tc` \ env@(TcEnv {tcLEnv = le, tcTyVars = gtvs}) -> + let + le' = extendNameEnvList le [ (getName tv, ATyVar tv) | tv <- tyvars] + new_tv_set = mkVarSet tyvars + in + -- It's important to add the in-scope tyvars to the global tyvar set + -- as well. Consider + -- f (x::r) = let g y = y::r in ... + -- Here, g mustn't be generalised. This is also important during + -- class and instance decls, when we mustn't generalise the class tyvars + -- when typechecking the methods. + tc_extend_gtvs gtvs new_tv_set `thenNF_Tc` \ gtvs' -> + tcSetEnv (env {tcLEnv = le', tcTyVars = gtvs'}) thing_inside + +-- This variant, tcExtendTyVarEnvForMeths, takes *two* bunches of tyvars: +-- the signature tyvars contain the original names +-- the instance tyvars are what those names should be mapped to +-- It's needed when typechecking the method bindings of class and instance decls +-- It does *not* extend the global tyvars; tcMethodBind does that for itself + +tcExtendTyVarEnvForMeths :: [TyVar] -> [TcTyVar] -> TcM r -> TcM r +tcExtendTyVarEnvForMeths sig_tyvars inst_tyvars thing_inside + = tcGetEnv `thenNF_Tc` \ env -> + let + le' = extendNameEnvList (tcLEnv env) stuff + stuff = [ (getName sig_tv, ATyVar inst_tv) + | (sig_tv, inst_tv) <- zipEqual "tcMeth" sig_tyvars inst_tyvars + ] + in + tcSetEnv (env {tcLEnv = le'}) thing_inside +\end{code} -tcExtendLocalValEnv names ids scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - tcReadMutVar gtvs `thenNF_Tc` \ global_tvs -> + +\begin{code} +tcExtendLocalValEnv :: [(Name,TcId)] -> TcM a -> TcM a +tcExtendLocalValEnv names_w_ids thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - lve' = addListToUFM lve (zipEqual "tcExtendLocalValEnv" names ids) - extra_global_tyvars = tyVarsOfTypes (map idType ids) - new_global_tyvars = global_tvs `unionTyVarSets` extra_global_tyvars + extra_global_tyvars = tyVarsOfTypes [idType id | (name,id) <- names_w_ids] + extra_env = [(name, ATcId id) | (name,id) <- names_w_ids] + le' = extendNameEnvList (tcLEnv env) extra_env in - tcNewMutVar new_global_tyvars `thenNF_Tc` \ gtvs' -> + tc_extend_gtvs (tcTyVars env) extra_global_tyvars `thenNF_Tc` \ gtvs' -> + tcSetEnv (env {tcLEnv = le', tcTyVars = gtvs'}) thing_inside +\end{code} - tcSetEnv (TcEnv tve tce ce gve lve' gtvs') scope + +%************************************************************************ +%* * +\subsection{The global tyvars} +%* * +%************************************************************************ + +\begin{code} +tcExtendGlobalTyVars extra_global_tvs thing_inside + = tcGetEnv `thenNF_Tc` \ env -> + tc_extend_gtvs (tcTyVars env) extra_global_tvs `thenNF_Tc` \ gtvs' -> + tcSetEnv (env {tcTyVars = gtvs'}) thing_inside + +tc_extend_gtvs gtvs extra_global_tvs + = tcReadMutVar gtvs `thenNF_Tc` \ global_tvs -> + tcNewMutVar (global_tvs `unionVarSet` extra_global_tvs) \end{code} @tcGetGlobalTyVars@ returns a fully-zonked set of tyvars free in the environment. @@ -224,107 +487,75 @@ To improve subsequent calls to the same function it writes the zonked set back i the environment. \begin{code} -tcGetGlobalTyVars :: NF_TcM s (TcTyVarSet s) +tcGetGlobalTyVars :: NF_TcM TcTyVarSet tcGetGlobalTyVars - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - tcReadMutVar gtvs `thenNF_Tc` \ global_tvs -> - zonkTcTyVars global_tvs `thenNF_Tc` \ global_tvs' -> - tcWriteMutVar gtvs global_tvs' `thenNF_Tc_` - returnNF_Tc global_tvs' - -tcExtendGlobalTyVars extra_global_tvs scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - tcReadMutVar gtvs `thenNF_Tc` \ global_tvs -> - let - new_global_tyvars = global_tvs `unionTyVarSets` extra_global_tvs - in - tcNewMutVar new_global_tyvars `thenNF_Tc` \ gtvs' -> - tcSetEnv (TcEnv tve tce ce gve lve gtvs') scope + = tcGetEnv `thenNF_Tc` \ (TcEnv {tcTyVars = gtv_var}) -> + tcReadMutVar gtv_var `thenNF_Tc` \ gbl_tvs -> + zonkTcTyVarsAndFV (varSetElems gbl_tvs) `thenNF_Tc` \ gbl_tvs' -> + tcWriteMutVar gtv_var gbl_tvs' `thenNF_Tc_` + returnNF_Tc gbl_tvs' \end{code} -\begin{code} -tcLookupLocalValue :: RnName -> NF_TcM s (Maybe (TcIdBndr s)) -tcLookupLocalValue name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupUFM lve name) -tcLookupLocalValueByKey :: Unique -> NF_TcM s (Maybe (TcIdBndr s)) -tcLookupLocalValueByKey uniq - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupUFM_Directly lve uniq) +%************************************************************************ +%* * +\subsection{The instance environment} +%* * +%************************************************************************ -tcLookupLocalValueOK :: String -> RnName -> NF_TcM s (TcIdBndr s) -tcLookupLocalValueOK err name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupWithDefaultUFM lve (panic err) name) +\begin{code} +tcGetInstEnv :: NF_TcM InstEnv +tcGetInstEnv = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (tcInsts env) +tcSetInstEnv :: InstEnv -> TcM a -> TcM a +tcSetInstEnv ie thing_inside + = tcGetEnv `thenNF_Tc` \ env -> + tcSetEnv (env {tcInsts = ie}) thing_inside +\end{code} -tcLookupGlobalValue :: RnName -> NF_TcM s Id -tcLookupGlobalValue (WiredInId id) -- wired in ids - = returnNF_Tc id +%************************************************************************ +%* * +\subsection{The InstInfo type} +%* * +%************************************************************************ -tcLookupGlobalValue name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupWithDefaultUFM gve def name) - where -#ifdef DEBUG - def = pprPanic "tcLookupGlobalValue:" (ppr PprDebug name) -#else - def = panic "tcLookupGlobalValue" -#endif - -tcLookupGlobalValueByKey :: Unique -> NF_TcM s Id -tcLookupGlobalValueByKey uniq - = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) -> - returnNF_Tc (lookupWithDefaultUFM_Directly gve def uniq) - where -#ifdef DEBUG - def = pprPanic "tcLookupGlobalValueByKey:" (pprUnique10 uniq) -#else - def = panic "tcLookupGlobalValueByKey" -#endif +The InstInfo type summarises the information in an instance declaration + instance c => k (t tvs) where b + +\begin{code} +data InstInfo + = InstInfo { + iDFunId :: DFunId, -- The dfun id + iBinds :: RenamedMonoBinds, -- Bindings, b + iPrags :: [RenamedSig] -- User pragmas recorded for generating specialised instances + } + +pprInstInfo info = vcat [ptext SLIT("InstInfo:") <+> ppr (idType (iDFunId info)), + nest 4 (ppr (iBinds info))] + +simpleInstInfoTy :: InstInfo -> Type +simpleInstInfoTy info = case splitDFunTy (idType (iDFunId info)) of + (_, _, _, [ty]) -> ty + +simpleInstInfoTyCon :: InstInfo -> TyCon + -- Gets the type constructor for a simple instance declaration, + -- i.e. one of the form instance (...) => C (T a b c) where ... +simpleInstInfoTyCon inst = tyConAppTyCon (simpleInstInfoTy inst) \end{code} -Constructing new Ids -~~~~~~~~~~~~~~~~~~~~ +%************************************************************************ +%* * +\subsection{Errors} +%* * +%************************************************************************ \begin{code} -newMonoIds :: [RnName] -> Kind -> ([TcIdBndr s] -> TcM s a) -> TcM s a +badCon con_id = quotes (ppr con_id) <+> ptext SLIT("is not a data constructor") -newMonoIds names kind m - = newTyVarTys no_of_names kind `thenNF_Tc` \ tys -> - tcGetUniques no_of_names `thenNF_Tc` \ uniqs -> - let - new_ids = zipWith3Equal "newMonoIds" mk_id names uniqs tys - - mk_id name uniq ty - = let - name_str = case (getOccName name) of { Unqual n -> n; Qual m n -> n } - in - mkUserLocal name_str uniq ty (getSrcLoc name) - in - tcExtendLocalValEnv names new_ids (m new_ids) - where - no_of_names = length names - -newLocalId :: FAST_STRING -> TcType s -> NF_TcM s (TcIdOcc s) -newLocalId name ty - = tcGetSrcLoc `thenNF_Tc` \ loc -> - tcGetUnique `thenNF_Tc` \ uniq -> - returnNF_Tc (TcId (mkUserLocal name uniq ty loc)) - -newLocalIds :: [FAST_STRING] -> [TcType s] -> NF_TcM s [TcIdOcc s] -newLocalIds names tys - = tcGetSrcLoc `thenNF_Tc` \ loc -> - tcGetUniques (length names) `thenNF_Tc` \ uniqs -> - let - new_ids = zipWith3Equal "newLocalIds" mk_id names uniqs tys - mk_id name uniq ty = TcId (mkUserLocal name uniq ty loc) - in - returnNF_Tc new_ids +notFound wheRe name = failWithTc (text wheRe <> colon <+> quotes (ppr name) <+> + ptext SLIT("is not in scope")) \end{code} - -