X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcEnv.lhs;h=0192bbabe9ad8f9bb4d6cb710b8e31876e6f833a;hb=0aa61e36c7baf3bb001049d495a46f0fdc330952;hp=c2b831dcaa6e1ea35fbb4aa59caa38f583728cf0;hpb=6c381e873e222417d9a67aeec77b9555eca7b7a8;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcEnv.lhs b/ghc/compiler/typecheck/TcEnv.lhs index c2b831d..0192bba 100644 --- a/ghc/compiler/typecheck/TcEnv.lhs +++ b/ghc/compiler/typecheck/TcEnv.lhs @@ -1,205 +1,466 @@ \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, - tcExtendKindEnv, tcExtendTyVarEnv, tcExtendTyConEnv, tcExtendClassEnv, - tcLookupTyVar, tcLookupTyCon, tcLookupClass, tcLookupClassByKey, + -- Instance environment, and InstInfo type + tcGetInstEnv, tcSetInstEnv, + InstInfo(..), pprInstInfo, + simpleInstInfoTy, simpleInstInfoTyCon, - tcExtendGlobalValEnv, tcExtendLocalValEnv, - tcLookupLocalValue, tcLookupLocalValueOK, - tcLookupGlobalValue, tcLookupGlobalValueByKey, + -- Global environment + tcExtendGlobalEnv, tcExtendGlobalValEnv, + tcLookupTyCon, tcLookupClass, tcLookupGlobalId, tcLookupDataCon, + tcLookupGlobal_maybe, tcLookupGlobal, tcLookupSyntaxId, tcLookupSyntaxName, - tcTyVarScope, newMonoIds, newLocalIds, - tcGetGlobalTyVars - ) where + -- Local environment + tcExtendKindEnv, tcLookupLocalIds, + tcExtendTyVarEnv, tcExtendTyVarEnvForMeths, + tcExtendLocalValEnv, tcLookup, tcLookup_maybe, + -- Global type variables + tcGetGlobalTyVars, tcExtendGlobalTyVars, -import Ubiq -import TcMLoop -- for paranoia checking + -- Random useful things + RecTcEnv, tcAddImportedIdInfo, tcLookupRecId, tcLookupRecId_maybe, -import Id ( Id(..), GenId, idType, mkUserLocal ) -import TcHsSyn ( TcIdBndr(..) ) -import TcKind ( TcKind, newKindVars, tcKindToKind, kindToTcKind ) -import TcType ( TcType(..), TcMaybe, TcTyVar(..), TcTyVarSet(..), newTyVarTys, zonkTcTyVars ) -import TyVar ( mkTyVar, getTyVarKind, unionTyVarSets, emptyTyVarSet ) -import Type ( tyVarsOfTypes ) -import TyCon ( TyCon, getTyConKind ) -import Class ( Class(..), GenClass, getClassSig ) + -- New Ids + newLocalId, newSpecPragmaId, + newDFunName, + -- Misc + isLocalThing, tcSetEnv + ) where + +#include "HsVersions.h" + +import RnHsSyn ( RenamedMonoBinds, RenamedSig ) import TcMonad +import TcType ( TcKind, TcType, TcTyVar, TcTyVarSet, + zonkTcTyVarsAndFV + ) +import Id ( idName, mkUserLocal, isDataConWrapId_maybe ) +import IdInfo ( constantIdInfo ) +import MkId ( mkSpecPragmaId ) +import Var ( TyVar, Id, idType, lazySetIdInfo, idInfo ) +import VarSet +import Type ( Type, + tyVarsOfTypes, splitDFunTy, + getDFunTyKey, tyConAppTyCon + ) +import DataCon ( DataCon ) +import TyCon ( TyCon ) +import Class ( Class, ClassOpItem, ClassContext ) +import Name ( Name, OccName, NamedThing(..), + nameOccName, getSrcLoc, mkLocalName, + isLocalName, nameModule_maybe + ) +import Name ( NameEnv, lookupNameEnv, nameEnvElts, extendNameEnvList, emptyNameEnv ) +import OccName ( mkDFunOcc, occNameString ) +import HscTypes ( DFunId, TypeEnv, HomeSymbolTable, PackageTypeEnv ) +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} + +%************************************************************************ +%* * +\subsection{TcEnv} +%* * +%************************************************************************ + +\begin{code} +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 are in the local envt) + + 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} + +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 -import Name ( Name(..), getNameShortName ) -import PprStyle -import Pretty -import Unique ( Unique ) -import UniqFM -import Util ( zipWithEqual, zipWith3Equal, zipLazy, panic ) + b) used to augment the GlobalSymbolTable + + +\begin{code} +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 = [cl | AClass cl <- nameEnvElts (tcGEnv env)] +tcEnvTyCons env = [tc | ATyCon tc <- nameEnvElts (tcGEnv env)] +tcEnvIds env = [id | AnId id <- nameEnvElts (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 ClassContext [DataCon] [Id] + | ClassDetails ClassContext [Id] [ClassOpItem] DataCon \end{code} -Data type declarations -~~~~~~~~~~~~~~~~~~~~~ + +%************************************************************************ +%* * +\subsection{Basic lookups} +%* * +%************************************************************************ \begin{code} -data TcEnv s = TcEnv - (TyVarEnv s) - (ValueEnv Id) -- Globals - (ValueEnv (TcIdBndr s)) -- Locals - (MutableVar s (TcTyVarSet s)) -- Free type variables of locals - -- ...why mutable? see notes with tcGetGlobalTyVars - (KindEnv s) -- Gives TcKinds of TyCons and Classes - TyConEnv - ClassEnv - -type TyVarEnv s = UniqFM (TcKind s, TyVar) -type TyConEnv = UniqFM TyCon -type KindEnv s = UniqFM (TcKind s) -type ClassEnv = UniqFM Class -type ValueEnv id = UniqFM id - -initEnv :: MutableVar s (TcTyVarSet s) -> TcEnv s -initEnv mut = TcEnv emptyUFM emptyUFM emptyUFM mut emptyUFM emptyUFM emptyUFM - -getEnv_LocalIds (TcEnv _ _ ls _ _ _ _) = ls -getEnv_TyCons (TcEnv _ _ _ _ _ ts _) = ts -getEnv_Classes (TcEnv _ _ _ _ _ _ cs) = cs +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} -Making new TcTyVars, with knot tying! -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \begin{code} -tcTyVarScope :: [Name] -- Names of some type variables - -> ([TyVar] -> TcM s a) -- Thing to type check in their scope - -> TcM s a -- Result - -tcTyVarScope tyvar_names thing_inside - = newKindVars (length tyvar_names) `thenNF_Tc` \ tyvar_kinds -> - - fixTc (\ ~(tyvars, _) -> - -- Ok to look at kinds, but not tyvars! - tcExtendTyVarEnv tyvar_names (tyvar_kinds `zipLazy` tyvars) ( - - -- Do the thing inside - thing_inside tyvars `thenTc` \ result -> - - -- Get the tyvar's Kinds from their TcKinds - mapNF_Tc tcKindToKind tyvar_kinds `thenNF_Tc` \ tyvar_kinds' -> - - -- Construct the real TyVars - let - tyvars = zipWithEqual mk_tyvar tyvar_names tyvar_kinds' - mk_tyvar name kind = mkTyVar (getNameShortName name) (getItsUnique name) kind - in - returnTc (tyvars, result) - )) `thenTc` \ (_,result) -> - returnTc result +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) constantIdInfo + 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} +%************************************************************************ +%* * +\subsection{Making new Ids} +%* * +%************************************************************************ + +Constructing new Ids -The Kind, TyVar, Class and TyCon envs -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +\begin{code} +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} -Extending the environments +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} -tcExtendKindEnv :: [Name] -> [TcKind s] -> TcM s r -> TcM s r -tcExtendKindEnv names kinds scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - let - ke' = addListToUFM ke (names `zip` kinds) - in - tcSetEnv (TcEnv tve gve lve gtvs ke' tce ce) scope +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) -tcExtendTyVarEnv :: [Name] -> [(TcKind s, TyVar)] -> TcM s r -> TcM s r -tcExtendTyVarEnv tyvar_names kinds_w_tyvars scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - let - tve' = addListToUFM tve (tyvar_names `zip` kinds_w_tyvars) - in - tcSetEnv (TcEnv tve' gve lve gtvs ke tce ce) scope +newDFunName clas [] loc = pprPanic "newDFunName" (ppr clas <+> ppr loc) +\end{code} -tcExtendTyConEnv tycons scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> +\begin{code} +isLocalThing :: NamedThing a => Module -> a -> Bool + -- True if the thing has a Local name, + -- or a Global name from the specified module +isLocalThing mod thing = case nameModule_maybe (getName thing) of + Nothing -> True -- A local name + Just m -> m == mod -- A global 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_Directly tce [(getItsUnique tycon, tycon) | tycon <- tycons] + ge' = extendNameEnvList (tcGEnv env) [(getName thing, thing) | thing <- things] in - tcSetEnv (TcEnv tve gve lve gtvs ke tce' ce) scope + tcSetEnv (env {tcGEnv = ge'}) thing_inside -tcExtendClassEnv classes scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> +tcExtendGlobalValEnv :: [Id] -> TcM a -> TcM a +tcExtendGlobalValEnv ids thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - ce' = addListToUFM_Directly ce [(getItsUnique clas, clas) | clas <- classes] + ge' = extendNameEnvList (tcGEnv env) [(getName id, AnId id) | id <- ids] in - tcSetEnv (TcEnv tve gve lve gtvs ke tce ce') scope + tcSetEnv (env {tcGEnv = ge'}) thing_inside \end{code} -Looking up in the environments - \begin{code} -tcLookupTyVar name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - returnNF_Tc (lookupWithDefaultUFM tve (panic "tcLookupTyVar") 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. + +\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 (WiredInTyCon tc) -- wired in tycons - = returnNF_Tc (kindToTcKind (getTyConKind tc), tc) +tcLookupClass :: Name -> NF_TcM Class +tcLookupClass 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 - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - let - tycon = lookupWithDefaultUFM tce (panic "tcLookupTyCon") name - kind = lookupWithDefaultUFM ke (kindToTcKind (getTyConKind tycon)) name - -- The KE will bind tycon in the current mutually-recursive set. - -- If the KE doesn't, then the tycon is already defined, and we - -- can safely grab the kind from the TyCon itself - in - returnNF_Tc (kind,tycon) + = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_tc -> + case maybe_tc of + Just (ATyCon tc) -> returnNF_Tc tc + other -> notFound "tcLookupTyCon" 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.fromInt +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} -tcLookupClass name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> +%************************************************************************ +%* * +\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} + + +\begin{code} +tcExtendKindEnv :: [(Name,TcKind)] -> TcM r -> TcM r +tcExtendKindEnv pairs thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - clas = lookupWithDefaultUFM ce (panic "tcLookupClass") name - (tyvar, _, _) = getClassSig clas - kind = lookupWithDefaultUFM ke (kindToTcKind (getTyVarKind tyvar)) name + le' = extendNameEnvList (tcLEnv env) [(n, AThing k) | (n,k) <- pairs] + -- No need to extend global tyvars for kind checking in - returnNF_Tc (kind,clas) - -tcLookupClassByKey uniq - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> + 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 - clas = lookupWithDefaultUFM_Directly ce (panic "tcLookupClas") uniq + le' = extendNameEnvList le [ (getName tv, ATyVar tv) | tv <- tyvars] + new_tv_set = mkVarSet tyvars in - returnNF_Tc (clas) + -- 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} - -Extending and consulting the value environment -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \begin{code} -tcExtendGlobalValEnv ids scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> +tcExtendLocalValEnv :: [(Name,TcId)] -> TcM a -> TcM a +tcExtendLocalValEnv names_w_ids thing_inside + = tcGetEnv `thenNF_Tc` \ env -> let - gve' = addListToUFM_Directly gve [(getItsUnique id, id) | id <- ids] + 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 - tcSetEnv (TcEnv tve gve' lve gtvs ke tce ce) scope + tc_extend_gtvs (tcTyVars env) extra_global_tyvars `thenNF_Tc` \ gtvs' -> + tcSetEnv (env {tcLEnv = le', tcTyVars = gtvs'}) thing_inside +\end{code} -tcExtendLocalValEnv names ids scope - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - tcReadMutVar gtvs `thenNF_Tc` \ global_tvs -> - let - lve' = addListToUFM lve (names `zip` ids) - extra_global_tyvars = tyVarsOfTypes (map idType ids) - new_global_tyvars = global_tvs `unionTyVarSets` extra_global_tyvars - in - tcNewMutVar new_global_tyvars `thenNF_Tc` \ gtvs' -> - tcSetEnv (TcEnv tve gve lve' gtvs' ke tce ce) 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. @@ -207,83 +468,76 @@ 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 gve lve gtvs ke tce ce) -> - tcReadMutVar gtvs `thenNF_Tc` \ global_tvs -> - zonkTcTyVars global_tvs `thenNF_Tc` \ global_tvs' -> - tcWriteMutVar gtvs global_tvs' `thenNF_Tc_` - returnNF_Tc global_tvs' + = 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 :: Name -> NF_TcM s (Maybe (TcIdBndr s)) -tcLookupLocalValue name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - returnNF_Tc (lookupUFM lve name) -tcLookupLocalValueOK :: String -> Name -> NF_TcM s (TcIdBndr s) -tcLookupLocalValueOK err name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - returnNF_Tc (lookupWithDefaultUFM lve (panic err) name) +%************************************************************************ +%* * +\subsection{The instance environment} +%* * +%************************************************************************ +\begin{code} +tcGetInstEnv :: NF_TcM InstEnv +tcGetInstEnv = tcGetEnv `thenNF_Tc` \ env -> + returnNF_Tc (tcInsts env) -tcLookupGlobalValue :: Name -> NF_TcM s Id +tcSetInstEnv :: InstEnv -> TcM a -> TcM a +tcSetInstEnv ie thing_inside + = tcGetEnv `thenNF_Tc` \ env -> + tcSetEnv (env {tcInsts = ie}) thing_inside +\end{code} -tcLookupGlobalValue (WiredInVal id) -- wired in ids - = returnNF_Tc id -tcLookupGlobalValue name - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - returnNF_Tc (lookupWithDefaultUFM gve def name) - where -#ifdef DEBUG - def = panic ("tcLookupGlobalValue:" ++ ppShow 1000 (ppr PprDebug name)) -#else - def = panic "tcLookupGlobalValue" -#endif +%************************************************************************ +%* * +\subsection{The InstInfo type} +%* * +%************************************************************************ +The InstInfo type summarises the information in an instance declaration -tcLookupGlobalValueByKey :: Unique -> NF_TcM s Id -tcLookupGlobalValueByKey uniq - = tcGetEnv `thenNF_Tc` \ (TcEnv tve gve lve gtvs ke tce ce) -> - returnNF_Tc (lookupWithDefaultUFM_Directly gve def uniq) - where -#ifdef DEBUG - def = panic ("tcLookupGlobalValueByKey:" ++ ppShow 1000 (ppr PprDebug uniq)) -#else - def = panic "tcLookupGlobalValueByKey" -#endif + instance c => k (t tvs) where b +\begin{code} +data InstInfo + = InstInfo { + iLocal :: Bool, -- True <=> it's defined in this module + 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 :: [Name] -> Kind -> ([TcIdBndr s] -> TcM s a) -> TcM s a -newMonoIds names kind m - = newTyVarTys no_of_names kind `thenNF_Tc` \ tys -> - tcGetUniques no_of_names `thenNF_Tc` \ uniqs -> - let - new_ids = zipWith3Equal mk_id names uniqs tys - mk_id name uniq ty = mkUserLocal (getOccurrenceName name) uniq ty - (getSrcLoc name) - in - tcExtendLocalValEnv names new_ids (m new_ids) - where - no_of_names = length names +badCon con_id = quotes (ppr con_id) <+> ptext SLIT("is not a data constructor") -newLocalIds :: [FAST_STRING] -> [TcType s] -> NF_TcM s [TcIdBndr s] -newLocalIds names tys - = tcGetSrcLoc `thenNF_Tc` \ loc -> - tcGetUniques (length names) `thenNF_Tc` \ uniqs -> - let - new_ids = zipWith3Equal mk_id names uniqs tys - mk_id name uniq ty = 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} - -