\begin{code}
module TcEnv(
- TcId, TcIdSet, tcInstId,
- tcLookupDataCon,
+ TcId, TcIdSet,
+ TyThing(..), TyThingDetails(..), TcTyThing(..),
- TcEnv, ValueEnv, TcTyThing(..),
-
- initEnv, getEnvTyCons, getEnvClasses, getAllEnvTyCons,
+ -- Getting stuff from the environment
+ TcEnv, initTcEnv,
+ tcEnvTyCons, tcEnvClasses, tcEnvIds, tcEnvTcIds, tcEnvTyVars,
- tcExtendTyVarEnv, tcExtendTyVarEnvForMeths, tcExtendTypeEnv, tcGetInScopeTyVars,
-
- tcLookupTy,
- tcLookupTyCon, tcLookupTyConByKey,
- tcLookupClass, tcLookupClassByKey,
+ -- Instance environment
+ tcGetInstEnv, tcSetInstEnv,
- tcExtendGlobalValEnv, tcExtendLocalValEnv,
- tcGetValueEnv, tcSetValueEnv,
- tcAddImportedIdInfo,
+ -- Global environment
+ tcExtendGlobalEnv, tcExtendGlobalValEnv,
+ tcLookupTyCon, tcLookupClass, tcLookupGlobalId, tcLookupDataCon,
+ tcLookupGlobal_maybe,
- tcLookupValue, tcLookupValueMaybe,
- tcLookupValueByKey, tcLookupValueByKeyMaybe,
- explicitLookupValueByKey, explicitLookupValue,
+ -- Local environment
+ tcExtendKindEnv,
+ tcExtendTyVarEnv, tcExtendTyVarEnvForMeths,
+ tcExtendLocalValEnv,
- newLocalId, newSpecPragmaId,
+ -- Global type variables
tcGetGlobalTyVars, tcExtendGlobalTyVars,
- badCon, badPrimOp
+ -- Random useful things
+ tcAddImportedIdInfo, tcInstId,
+
+ -- New Ids
+ newLocalId, newSpecPragmaId,
+ newDefaultMethodName, newDFunName
) where
#include "HsVersions.h"
-import HsTypes ( HsTyVar, getTyVarName )
-import Id ( mkUserLocal, isDataConId_maybe )
+import TcMonad
+import TcType ( TcKind, TcType, TcTyVar, TcTyVarSet, TcThetaType,
+ tcInstTyVars, zonkTcTyVars,
+ )
+import Id ( mkUserLocal, isDataConWrapId_maybe )
+import IdInfo ( vanillaIdInfo )
import MkId ( mkSpecPragmaId )
import Var ( TyVar, Id, setVarName,
- idType, lazySetIdInfo, idInfo, tyVarKind
- )
-import TcType ( TcType, TcTyVar, TcTyVarSet, TcThetaType,
- tcInstTyVars, zonkTcTyVars,
- TcKind, kindToTcKind
+ idType, lazySetIdInfo, idInfo, tyVarKind, UVar,
)
-import VarEnv
import VarSet
-import Type ( Kind, superKind,
- tyVarsOfType, tyVarsOfTypes, mkTyVarTy,
+import VarEnv ( TyVarSubstEnv )
+import Type ( Kind, Type, superKind,
+ tyVarsOfType, tyVarsOfTypes,
splitForAllTys, splitRhoTy, splitFunTys,
- splitAlgTyConApp_maybe, getTyVar
+ splitAlgTyConApp_maybe, getTyVar, getDFunTyKey
)
-import Subst ( substTy )
-import UsageSPUtils ( unannotTy )
import DataCon ( DataCon )
import TyCon ( TyCon, tyConKind, tyConArity, isSynTyCon )
-import Class ( Class, classTyCon )
-
-import TcMonad
-
-import BasicTypes ( Arity )
-import IdInfo ( vanillaIdInfo )
-import Name ( Name, OccName, nameOccName, getSrcLoc,
- maybeWiredInTyConName, maybeWiredInIdName, isLocallyDefined,
- NamedThing(..)
- )
-import Unique ( pprUnique10, Unique, Uniquable(..) )
-import FiniteMap ( lookupFM, addToFM )
+import Class ( Class, ClassOpItem, ClassContext, classTyCon )
+import Subst ( substTy )
+import Name ( Name, OccName, NamedThing(..),
+ nameOccName, nameModule, getSrcLoc, mkGlobalName,
+ isLocallyDefined,
+ NameEnv, emptyNameEnv, lookupNameEnv, nameEnvElts,
+ extendNameEnv, extendNameEnvList
+ )
+import OccName ( mkDFunOcc, mkDefaultMethodOcc, occNameString )
+import Module ( Module )
+import Unify ( unifyTyListsX, matchTys )
+import HscTypes ( ModDetails(..), InstEnv, lookupTypeEnv, TyThing(..),
+ GlobalSymbolTable, Provenance(..) )
+import Unique ( pprUnique10, Unique, Uniquable(..) )
import UniqFM
-import Unique ( Uniquable(..) )
-import Util ( zipEqual, zipWith3Equal, mapAccumL )
-import Bag ( bagToList )
-import Maybes ( maybeToBool, catMaybes )
-import SrcLoc ( SrcLoc )
+import Unique ( Uniquable(..) )
+import Util ( zipEqual, zipWith3Equal, mapAccumL )
+import SrcLoc ( SrcLoc )
import FastString ( FastString )
+import Maybes
import Outputable
+import IOExts ( newIORef )
\end{code}
%************************************************************************
%* *
-\subsection{TcId}
+\subsection{TcEnv}
%* *
%************************************************************************
-
\begin{code}
type TcId = Id -- Type may be a TcType
type TcIdSet = IdSet
-tcLookupDataCon :: Name -> TcM s (DataCon, [TcType], TcType)
-tcLookupDataCon con_name
- = tcLookupValue con_name `thenNF_Tc` \ con_id ->
- case isDataConId_maybe con_id of {
- Nothing -> failWithTc (badCon con_id);
- Just data_con ->
-
- tcInstId con_id `thenNF_Tc` \ (_, _, con_tau) ->
- -- Ignore the con_theta; overloaded constructors only
- -- behave differently when called, not when used for
- -- matching.
- let
- (arg_tys, result_ty) = splitFunTys con_tau
- in
- ASSERT( maybeToBool (splitAlgTyConApp_maybe result_ty) )
- returnTc (data_con, arg_tys, result_ty) }
+data TcEnv
+ = TcEnv {
+ tcGST :: GlobalSymbolTable, -- The symbol table at the moment we began this compilation
+
+ tcInsts :: InstEnv, -- All instances (both imported and in this module)
+
+ tcGEnv :: NameEnv TyThing, -- The global type environment we've accumulated while
+ -- 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
+
+ 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 :: GlobalSymbolTable -> InstEnv -> IO TcEnv
+initTcEnv gst inst_env
+ = do { gtv_var <- newIORef emptyVarSet ;
+ return (TcEnv { tcGST = gst,
+ tcGEnv = emptyNameEnv,
+ tcInsts = inst_env,
+ tcLEnv = emptyNameEnv,
+ tcTyVars = gtv_var
+ })}
+
+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)]
+
+-- This data type is used to help tie the knot
+-- when type checking type and class declarations
+data TyThingDetails = SynTyDetails Type
+ | DataTyDetails ClassContext [DataCon] [Class]
+ | ClassDetails ClassContext [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 -> lookupTypeEnv (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
+
+explicitLookupId :: TcEnv -> Name -> Maybe Id
+explicitLookupId env name = case lookup_global env name of
+ Just (AnId id) -> Just id
+ other -> Nothing
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Random useful functions}
+%* *
+%************************************************************************
+
+
+\begin{code}
-- A useful function that takes an occurrence of a global thing
-- and instantiates its type with fresh type variables
tcInstId :: Id
- -> NF_TcM s ([TcTyVar], -- It's instantiated type
+ -> NF_TcM ([TcTyVar], -- It's instantiated type
TcThetaType, --
TcType) --
tcInstId id
= let
- (tyvars, rho) = splitForAllTys (unannotTy (idType id))
+ (tyvars, rho) = splitForAllTys (idType id)
in
tcInstTyVars tyvars `thenNF_Tc` \ (tyvars', arg_tys, tenv) ->
let
(theta', tau') = splitRhoTy rho'
in
returnNF_Tc (tyvars', theta', tau')
+
+tcAddImportedIdInfo :: TcEnv -> Id -> Id
+tcAddImportedIdInfo unf_env id
+ | isLocallyDefined id -- Don't look up locally defined Ids, because they
+ -- have explicit local definitions, so we get a black hole!
+ = id
+ | otherwise
+ = id `lazySetIdInfo` new_info
+ -- The Id must be returned without a data dependency on maybe_id
+ where
+ new_info = case explicitLookupId unf_env (getName id) of
+ Nothing -> vanillaIdInfo
+ Just imported_id -> idInfo imported_id
+ -- ToDo: could check that types are the same
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Making new Ids}
+%* *
+%************************************************************************
+
+Constructing new Ids
+
+\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}
-Between the renamer and the first invocation of the UsageSP inference,
-identifiers read from interface files will have usage information in
-their types, whereas other identifiers will not. The unannotTy here
-in @tcInstId@ prevents this information from pointlessly propagating
-further prior to the first usage inference.
+Make a name for the dict fun for an instance decl
+
+\begin{code}
+newDFunName :: Module -> Class -> [Type] -> SrcLoc -> NF_TcM Name
+newDFunName mod clas (ty:_) loc
+ = tcGetDFunUniq dfun_string `thenNF_Tc` \ inst_uniq ->
+ tcGetUnique `thenNF_Tc` \ uniq ->
+ returnNF_Tc (mkGlobalName uniq mod
+ (mkDFunOcc dfun_string inst_uniq)
+ loc)
+ where
+ -- Any string that is somewhat unique will do
+ dfun_string = occNameString (getOccName clas) ++ occNameString (getDFunTyKey ty)
+
+newDefaultMethodName :: Name -> SrcLoc -> NF_TcM Name
+newDefaultMethodName op_name loc
+ = tcGetUnique `thenNF_Tc` \ uniq ->
+ returnNF_Tc (mkGlobalName uniq (nameModule op_name)
+ (mkDefaultMethodOcc (getOccName op_name))
+ loc)
+\end{code}
%************************************************************************
%* *
-\subsection{TcEnv}
+\subsection{The global environment}
%* *
%************************************************************************
-Data type declarations
-~~~~~~~~~~~~~~~~~~~~~
+\begin{code}
+tcExtendGlobalEnv :: [(Name, TyThing)] -> TcM r -> TcM r
+tcExtendGlobalEnv bindings thing_inside
+ = tcGetEnv `thenNF_Tc` \ env ->
+ let
+ ge' = extendNameEnvList (tcGEnv env) bindings
+ in
+ tcSetEnv (env {tcGEnv = ge'}) thing_inside
+
+tcExtendGlobalValEnv :: [Id] -> TcM a -> TcM a
+tcExtendGlobalValEnv ids thing_inside
+ = tcExtendGlobalEnv [(getName id, AnId id) | id <- ids] thing_inside
+\end{code}
+
\begin{code}
-data TcEnv = TcEnv
- TypeEnv
- ValueEnv
- (TcTyVarSet, -- The in-scope TyVars
- TcRef TcTyVarSet) -- Free type variables of the value env
- -- ...why mutable? see notes with tcGetGlobalTyVars
- -- Includes the in-scope tyvars
-
-type NameEnv val = UniqFM val -- Keyed by Names
-
-type TypeEnv = NameEnv (TcKind, Maybe Arity, TcTyThing)
-type ValueEnv = NameEnv Id
-
-data TcTyThing = ATyVar TcTyVar -- Mutable only so that the kind can be mutable
- -- if the kind is mutable, the tyvar must be so that
- -- zonking works
- | ATyCon TyCon
- | AClass Class
-
-
-initEnv :: TcRef TcTyVarSet -> TcEnv
-initEnv mut = TcEnv emptyUFM emptyUFM (emptyVarSet, mut)
-
-getEnvTyCons (TcEnv te _ _) = [tc | (_, _, ATyCon tc) <- eltsUFM te]
-getEnvClasses (TcEnv te _ _) = [cl | (_, _, AClass cl) <- eltsUFM te]
-getAllEnvTyCons (TcEnv te _ _) = catMaybes (map gettc (eltsUFM te))
- where
- gettc (_,_, ATyCon tc) = Just tc
- gettc (_,_, AClass cl) = Just (classTyCon cl)
- gettc _ = Nothing
+tcLookupGlobal_maybe :: Name -> NF_TcM (Maybe TyThing)
+tcLookupGlobal_maybe name
+ = tcGetEnv `thenNF_Tc` \ env ->
+ returnNF_Tc (lookup_global env name)
\end{code}
-The TypeEnv
-~~~~~~~~~~~~
+A variety of global lookups, when we know what we are looking for.
-Extending the type environment.
+\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 clas) -> returnNF_Tc clas
+ 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)
+
+
+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
+ = tcLookupGlobal_maybe name `thenNF_Tc` \ maybe_tc ->
+ case maybe_tc of
+ Just (ATyCon tc) -> returnNF_Tc tc
+ other -> notFound "tcLookupTyCon:" name
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{The local environment}
+%* *
+%************************************************************************
\begin{code}
-tcExtendTyVarEnv :: [TyVar] -> TcM s r -> TcM s r
-tcExtendTyVarEnv tyvars scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve (in_scope_tvs, gtvs)) ->
+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
- extend_list = [ (getName tv, (kindToTcKind (tyVarKind tv), Nothing, ATyVar tv))
- | tv <- tyvars
- ]
- te' = addListToUFM te extend_list
- new_tv_set = mkVarSet tyvars
- in_scope_tvs' = in_scope_tvs `unionVarSet` new_tv_set
+ le' = extendNameEnvList (tcLEnv env) [(n, AThing k) | (n,k) <- pairs]
+ -- No need to extend global tyvars for kind checking
+ in
+ 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
-- 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 (TcEnv te' ve (in_scope_tvs', gtvs')) scope
+ tcSetEnv (env {tcLEnv = le', tcTyVars = gtvs'}) thing_inside
-- This variant, tcExtendTyVarEnvForMeths, takes *two* bunches of tyvars:
-- the signature tyvars contain the original names
-- 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 s r -> TcM s r
+tcExtendTyVarEnvForMeths :: [TyVar] -> [TcTyVar] -> TcM r -> TcM r
tcExtendTyVarEnvForMeths sig_tyvars inst_tyvars thing_inside
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- let
- te' = addListToUFM te stuff
- in
- tcSetEnv (TcEnv te' ve gtvs) thing_inside
- where
- stuff = [ (getName sig_tv, (kindToTcKind (tyVarKind inst_tv), Nothing, ATyVar inst_tv))
- | (sig_tv, inst_tv) <- zipEqual "tcMeth" sig_tyvars inst_tyvars
- ]
-
-tcExtendGlobalTyVars extra_global_tvs scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve (in_scope,gtvs)) ->
- tc_extend_gtvs gtvs extra_global_tvs `thenNF_Tc` \ gtvs' ->
- tcSetEnv (TcEnv te ve (in_scope,gtvs')) scope
-
-tc_extend_gtvs gtvs extra_global_tvs
- = tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
+ = tcGetEnv `thenNF_Tc` \ env ->
let
- new_global_tyvars = global_tvs `unionVarSet` extra_global_tvs
+ le' = extendNameEnvList (tcLEnv env) stuff
+ stuff = [ (getName sig_tv, ATyVar inst_tv)
+ | (sig_tv, inst_tv) <- zipEqual "tcMeth" sig_tyvars inst_tyvars
+ ]
in
- tcNewMutVar new_global_tyvars
+ tcSetEnv (env {tcLEnv = le'}) thing_inside
\end{code}
-@tcGetGlobalTyVars@ returns a fully-zonked set of tyvars free in the environment.
-To improve subsequent calls to the same function it writes the zonked set back into
-the environment.
\begin{code}
-tcGetGlobalTyVars :: NF_TcM s TcTyVarSet
-tcGetGlobalTyVars
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve (_,gtvs)) ->
- tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
- zonkTcTyVars (varSetElems global_tvs) `thenNF_Tc` \ global_tys' ->
+tcExtendLocalValEnv :: [(Name,TcId)] -> TcM a -> TcM a
+tcExtendLocalValEnv names_w_ids thing_inside
+ = tcGetEnv `thenNF_Tc` \ env ->
let
- global_tvs' = (tyVarsOfTypes global_tys')
+ 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
- tcWriteMutVar gtvs global_tvs' `thenNF_Tc_`
- returnNF_Tc global_tvs'
-
-tcGetInScopeTyVars :: NF_TcM s [TcTyVar]
-tcGetInScopeTyVars
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve (in_scope_tvs, gtvs)) ->
- returnNF_Tc (varSetElems in_scope_tvs)
-\end{code}
-
-
-Type constructors and classes
-
-\begin{code}
-tcExtendTypeEnv :: [(Name, (TcKind, Maybe Arity, TcTyThing))] -> TcM s r -> TcM s r
-tcExtendTypeEnv bindings scope
- = ASSERT( null [tv | (_, (_,_,ATyVar tv)) <- bindings] )
- -- Not for tyvars; use tcExtendTyVarEnv
- tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- let
- te' = addListToUFM te bindings
- in
- tcSetEnv (TcEnv te' ve gtvs) scope
-\end{code}
-
-
-Looking up in the environments.
-
-\begin{code}
-tcLookupTy :: Name -> NF_TcM s (TcKind, Maybe Arity, TcTyThing)
-tcLookupTy name
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- case lookupUFM te name of {
- Just thing -> returnNF_Tc thing ;
- Nothing ->
-
- case maybeWiredInTyConName name of
- Just tc -> returnNF_Tc (kindToTcKind (tyConKind tc), maybe_arity, ATyCon tc)
- where
- maybe_arity | isSynTyCon tc = Just (tyConArity tc)
- | otherwise = Nothing
-
- Nothing -> -- This can happen if an interface-file
- -- unfolding is screwed up
- failWithTc (tyNameOutOfScope name)
- }
-
-tcLookupClass :: Name -> NF_TcM s Class
-tcLookupClass name
- = tcLookupTy name `thenNF_Tc` \ (_, _, AClass clas) ->
- returnNF_Tc clas
-
-tcLookupTyCon :: Name -> NF_TcM s TyCon
-tcLookupTyCon name
- = tcLookupTy name `thenNF_Tc` \ (_, _, ATyCon tycon) ->
- returnNF_Tc tycon
-
-tcLookupClassByKey :: Unique -> NF_TcM s Class
-tcLookupClassByKey key
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- case lookupUFM_Directly te key of
- Just (_, _, AClass cl) -> returnNF_Tc cl
- other -> pprPanic "tcLookupClassByKey:" (pprUnique10 key)
-
-tcLookupTyConByKey :: Unique -> NF_TcM s TyCon
-tcLookupTyConByKey key
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- case lookupUFM_Directly te key of
- Just (_, _, ATyCon tc) -> returnNF_Tc tc
- other -> pprPanic "tcLookupTyConByKey:" (pprUnique10 key)
+ tc_extend_gtvs (tcTyVars env) extra_global_tyvars `thenNF_Tc` \ gtvs' ->
+ tcSetEnv (env {tcLEnv = le', tcTyVars = gtvs'}) thing_inside
\end{code}
-
-
%************************************************************************
%* *
-\subsection{The value environment}
+\subsection{The global tyvars}
%* *
%************************************************************************
\begin{code}
-tcExtendGlobalValEnv :: [Id] -> TcM s a -> TcM s a
-tcExtendGlobalValEnv ids scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- let
- ve' = addListToUFM_Directly ve [(getUnique id, id) | id <- ids]
- in
- tcSetEnv (TcEnv te ve' gtvs) scope
+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
-tcExtendLocalValEnv :: [(Name,TcId)] -> TcM s a -> TcM s a
-tcExtendLocalValEnv names_w_ids scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve (in_scope_tvs,gtvs)) ->
- tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
- let
- ve' = addListToUFM ve names_w_ids
- extra_global_tyvars = tyVarsOfTypes (map (idType . snd) names_w_ids)
- in
- tc_extend_gtvs gtvs extra_global_tyvars `thenNF_Tc` \ gtvs' ->
- tcSetEnv (TcEnv te ve' (in_scope_tvs,gtvs')) scope
+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.
+To improve subsequent calls to the same function it writes the zonked set back into
+the environment.
\begin{code}
-tcLookupValue :: Name -> NF_TcM s Id -- Panics if not found
-tcLookupValue name
- = case maybeWiredInIdName name of
- Just id -> returnNF_Tc id
- Nothing -> tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM ve def name)
- where
- def = pprPanic "tcLookupValue:" (ppr name)
-
-tcLookupValueMaybe :: Name -> NF_TcM s (Maybe Id)
-tcLookupValueMaybe name
- = case maybeWiredInIdName name of
- Just id -> returnNF_Tc (Just id)
- Nothing -> tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- returnNF_Tc (lookupUFM ve name)
-
-tcLookupValueByKey :: Unique -> NF_TcM s Id -- Panics if not found
-tcLookupValueByKey key
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- returnNF_Tc (explicitLookupValueByKey ve key)
-
-tcLookupValueByKeyMaybe :: Unique -> NF_TcM s (Maybe Id)
-tcLookupValueByKeyMaybe key
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- returnNF_Tc (lookupUFM_Directly ve key)
-
-tcGetValueEnv :: NF_TcM s ValueEnv
-tcGetValueEnv
- = tcGetEnv `thenNF_Tc` \ (TcEnv te ve gtvs) ->
- returnNF_Tc ve
-
-tcSetValueEnv :: ValueEnv -> TcM s a -> TcM s a
-tcSetValueEnv ve scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv te _ gtvs) ->
- tcSetEnv (TcEnv te ve gtvs) scope
-
--- Non-monadic version, environment given explicitly
-explicitLookupValueByKey :: ValueEnv -> Unique -> Id
-explicitLookupValueByKey ve key
- = lookupWithDefaultUFM_Directly ve def key
- where
- def = pprPanic "lookupValueByKey:" (pprUnique10 key)
-
-explicitLookupValue :: ValueEnv -> Name -> Maybe Id
-explicitLookupValue ve name
- = case maybeWiredInIdName name of
- Just id -> Just id
- Nothing -> lookupUFM ve name
-
- -- Extract the IdInfo from an IfaceSig imported from an interface file
-tcAddImportedIdInfo :: ValueEnv -> Id -> Id
-tcAddImportedIdInfo unf_env id
- | isLocallyDefined id -- Don't look up locally defined Ids, because they
- -- have explicit local definitions, so we get a black hole!
- = id
- | otherwise
- = id `lazySetIdInfo` new_info
- -- The Id must be returned without a data dependency on maybe_id
- where
- new_info = -- pprTrace "tcAdd" (ppr id) $
- case explicitLookupValue unf_env (getName id) of
- Nothing -> vanillaIdInfo
- Just imported_id -> idInfo imported_id
- -- ToDo: could check that types are the same
+tcGetGlobalTyVars :: NF_TcM TcTyVarSet
+tcGetGlobalTyVars
+ = tcGetEnv `thenNF_Tc` \ (TcEnv {tcTyVars = gtv_var}) ->
+ tcReadMutVar gtv_var `thenNF_Tc` \ global_tvs ->
+ zonkTcTyVars (varSetElems global_tvs) `thenNF_Tc` \ global_tys' ->
+ let
+ global_tvs' = (tyVarsOfTypes global_tys')
+ in
+ tcWriteMutVar gtv_var global_tvs' `thenNF_Tc_`
+ returnNF_Tc global_tvs'
\end{code}
%************************************************************************
%* *
-\subsection{Constructing new Ids}
+\subsection{The instance environment}
%* *
%************************************************************************
\begin{code}
-newLocalId :: OccName -> TcType -> SrcLoc -> NF_TcM s TcId
-newLocalId name ty loc
- = tcGetUnique `thenNF_Tc` \ uniq ->
- returnNF_Tc (mkUserLocal name uniq ty loc)
+tcGetInstEnv :: NF_TcM InstEnv
+tcGetInstEnv = tcGetEnv `thenNF_Tc` \ env ->
+ returnNF_Tc (tcInsts env)
-newSpecPragmaId :: Name -> TcType -> NF_TcM s TcId
-newSpecPragmaId name ty
- = tcGetUnique `thenNF_Tc` \ uniq ->
- returnNF_Tc (mkSpecPragmaId (nameOccName name) uniq ty (getSrcLoc name))
-\end{code}
+tcSetInstEnv :: InstEnv -> TcM a -> TcM a
+tcSetInstEnv ie thing_inside
+ = tcGetEnv `thenNF_Tc` \ env ->
+ tcSetEnv (env {tcInsts = ie}) thing_inside
+\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-badCon con_id
- = quotes (ppr con_id) <+> ptext SLIT("is not a data constructor")
-badPrimOp op
- = quotes (ppr op) <+> ptext SLIT("is not a primop")
+badCon con_id = quotes (ppr con_id) <+> ptext SLIT("is not a data constructor")
-tyNameOutOfScope name
- = quotes (ppr name) <+> ptext SLIT("is not in scope")
+notFound wheRe name = failWithTc (text wheRe <> colon <+> quotes (ppr name) <+>
+ ptext SLIT("is not in scope"))
\end{code}