\begin{code}
-#include "HsVersions.h"
-
module TcEnv(
- TcEnv,
+ TcId, TcIdSet, tcInstId,
+ tcLookupDataCon,
+
+ TcEnv, ValueEnv, TcTyThing(..),
- initEnv, getEnv_LocalIds, getEnv_TyCons, getEnv_Classes,
+ initEnv, getEnvTyCons, getEnvClasses, getEnvAllTyCons,
- tcTyVarScope, tcTyVarScopeGivenKinds, tcLookupTyVar,
+ tcExtendUVarEnv, tcLookupUVar,
- tcExtendTyConEnv, tcLookupTyCon, tcLookupTyConByKey,
- tcExtendClassEnv, tcLookupClass, tcLookupClassByKey,
+ tcExtendTyVarEnv, tcExtendTyVarEnvForMeths, tcExtendTypeEnv, tcGetInScopeTyVars,
+
+ tcLookupTy,
+ tcLookupTyConByKey,
+ tcLookupClassByKey, tcLookupClassByKey_maybe,
tcExtendGlobalValEnv, tcExtendLocalValEnv,
- tcLookupLocalValue, tcLookupLocalValueOK, tcLookupLocalValueByKey,
- tcLookupGlobalValue, tcLookupGlobalValueByKey, tcGlobalOcc,
+ tcGetValueEnv, tcSetValueEnv,
+ tcAddImportedIdInfo,
- newMonoIds, newLocalIds, newLocalId,
- tcGetGlobalTyVars
- ) where
+ tcLookupValue, tcLookupValueMaybe,
+ tcLookupValueByKey, tcLookupValueByKeyMaybe,
+ explicitLookupValueByKey, explicitLookupValue,
+ valueEnvIds,
+ newLocalId, newSpecPragmaId,
+ tcGetGlobalTyVars, tcExtendGlobalTyVars,
-import Ubiq
-import TcMLoop -- for paranoia checking
+ InstEnv, emptyInstEnv, addToInstEnv,
+ lookupInstEnv, InstLookupResult(..),
+ tcGetInstEnv, tcSetInstEnv, classInstEnv,
+
+ badCon, badPrimOp
+ ) where
+
+#include "HsVersions.h"
-import Id ( Id(..), GenId, idType, mkUserLocal )
-import TcHsSyn ( TcIdBndr(..), TcIdOcc(..) )
-import TcKind ( TcKind, newKindVars, tcDefaultKind, kindToTcKind )
-import TcType ( TcType(..), TcMaybe, TcTyVar(..), TcTyVarSet(..),
- newTyVarTys, tcInstTyVars, tcInstType, zonkTcTyVars
+import HsTypes ( HsTyVarBndr, getTyVarName )
+import Id ( mkUserLocal, isDataConWrapId_maybe )
+import MkId ( mkSpecPragmaId )
+import Var ( TyVar, Id, setVarName,
+ idType, lazySetIdInfo, idInfo, tyVarKind, UVar,
)
-import TyVar ( mkTyVar, getTyVarKind, unionTyVarSets, emptyTyVarSet )
-import Type ( tyVarsOfTypes )
-import TyCon ( TyCon, Arity(..), tyConKind, synTyConArity )
-import Class ( Class(..), GenClass, getClassSig )
+import TcType ( TcType, TcTyVar, TcTyVarSet, TcThetaType,
+ tcInstTyVars, zonkTcTyVars,
+ TcKind, kindToTcKind
+ )
+import VarEnv
+import VarSet
+import Type ( Kind, Type, superKind,
+ tyVarsOfType, tyVarsOfTypes, mkTyVarTy,
+ splitForAllTys, splitRhoTy, splitFunTys,
+ splitAlgTyConApp_maybe, getTyVar
+ )
+import Subst ( substTy )
+import UsageSPUtils ( unannotTy )
+import DataCon ( DataCon )
+import TyCon ( TyCon, tyConKind, tyConArity, isSynTyCon )
+import Class ( Class, classTyCon )
import TcMonad
-import Name ( Name{-instance NamedThing-} )
-import Outputable ( getOccName, getSrcLoc )
-import PprStyle
-import Pretty
-import RnHsSyn ( RnName(..) )
-import Type ( splitForAllTy )
-import Unique ( Unique )
-import UniqFM
-import Util ( zipWithEqual, zipWith3Equal, zipLazy, panic, pprPanic )
+import BasicTypes ( Arity )
+import IdInfo ( vanillaIdInfo )
+import Name ( Name, OccName, nameOccName, getSrcLoc,
+ maybeWiredInTyConName, maybeWiredInIdName, isLocallyDefined,
+ NamedThing(..),
+ NameEnv, emptyNameEnv, addToNameEnv,
+ extendNameEnv, lookupNameEnv, nameEnvElts
+ )
+import Unify ( unifyTyListsX, matchTys )
+import Unique ( pprUnique10, Unique, Uniquable(..) )
+import FiniteMap ( lookupFM, addToFM )
+import UniqFM
+import Unique ( Uniquable(..) )
+import Util ( zipEqual, zipWith3Equal, mapAccumL )
+import Bag ( bagToList )
+import SrcLoc ( SrcLoc )
+import FastString ( FastString )
+import Maybes
+import Outputable
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{TcId}
+%* *
+%************************************************************************
+
+
+\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 isDataConWrapId_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) }
+
+-- 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
+ TcThetaType, --
+ TcType) --
+tcInstId id
+ = let
+ (tyvars, rho) = splitForAllTys (unannotTy (idType id))
+ in
+ tcInstTyVars tyvars `thenNF_Tc` \ (tyvars', arg_tys, tenv) ->
+ let
+ rho' = substTy tenv rho
+ (theta', tau') = splitRhoTy rho'
+ in
+ returnNF_Tc (tyvars', theta', tau')
\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.
+
+
+%************************************************************************
+%* *
+\subsection{TcEnv}
+%* *
+%************************************************************************
+
Data type declarations
~~~~~~~~~~~~~~~~~~~~~
\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]
+data TcEnv = TcEnv
+ UsageEnv
+ TypeEnv
+ ValueEnv
+ InstEnv
+ (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 UsageEnv = NameEnv UVar
+type TypeEnv = NameEnv (TcKind, TcTyThing)
+type ValueEnv = NameEnv Id
+
+valueEnvIds :: ValueEnv -> [Id]
+valueEnvIds ve = nameEnvElts ve
+
+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
+ | ADataTyCon TyCon
+ | ASynTyCon TyCon Arity
+ | AClass Class Arity
+
+
+initEnv :: TcRef TcTyVarSet -> TcEnv
+initEnv mut = TcEnv emptyNameEnv emptyNameEnv emptyNameEnv emptyInstEnv (emptyVarSet, mut)
+
+getEnvClasses (TcEnv _ te _ _ _) = [cl | (_, AClass cl _) <- nameEnvElts te]
+
+getEnvTyCons (TcEnv _ te _ _ _) = catMaybes (map get_tc (nameEnvElts te))
+ where
+ get_tc (_, ADataTyCon tc) = Just tc
+ get_tc (_, ASynTyCon tc _) = Just tc
+ get_tc other = Nothing
+
+getEnvAllTyCons te_list = catMaybes (map get_tc te_list)
+ -- The 'all' means 'including the tycons from class decls'
+ where
+ get_tc (_, ADataTyCon tc) = Just tc
+ get_tc (_, ASynTyCon tc _) = Just tc
+ get_tc (_, AClass cl _) = Just (classTyCon cl)
+ get_tc other = Nothing
\end{code}
-Making new TcTyVars, with knot tying!
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+%************************************************************************
+%* *
+\subsection{The usage environment}
+%* *
+%************************************************************************
+
+Extending the usage environment
+
\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 (names `zip` (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 mk_tyvar names kinds'
- mk_tyvar name kind = mkTyVar name (uniqueOf name) kind
- in
- returnTc (tyvars, result)
- ) `thenTc` \ (_,result) ->
- returnTc result
-
-tcTyVarScope names thing_inside
- = newKindVars (length names) `thenNF_Tc` \ kinds ->
- tcTyVarScopeGivenKinds names kinds thing_inside
+tcExtendUVarEnv :: Name -> UVar -> TcM s r -> TcM s r
+tcExtendUVarEnv uv_name uv scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ tcSetEnv (TcEnv (addToNameEnv ue uv_name uv) te ve ie gtvs) scope
\end{code}
+Looking up in the environments.
-The Kind, TyVar, Class and TyCon envs
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+\begin{code}
+tcLookupUVar :: Name -> NF_TcM s UVar
+tcLookupUVar uv_name
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve _ gtvs) ->
+ case lookupNameEnv ue uv_name of
+ Just uv -> returnNF_Tc uv
+ Nothing -> failWithTc (uvNameOutOfScope uv_name)
+\end{code}
-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.
-\begin{code}
-tcExtendTyConEnv :: [(RnName,Maybe Arity)] -> [TyCon] -> TcM s r -> TcM s r
+%************************************************************************
+%* *
+\subsection{The type environment}
+%* *
+%************************************************************************
-tcExtendTyConEnv names_w_arities tycons scope
- = newKindVars (length names_w_arities) `thenNF_Tc` \ kinds ->
- tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+\begin{code}
+tcExtendTyVarEnv :: [TyVar] -> TcM s r -> TcM s r
+tcExtendTyVarEnv tyvars scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie (in_scope_tvs, gtvs)) ->
+ let
+ extend_list = [ (getName tv, (kindToTcKind (tyVarKind tv), ATyVar tv))
+ | tv <- tyvars
+ ]
+ te' = extendNameEnv te extend_list
+ new_tv_set = mkVarSet tyvars
+ in_scope_tvs' = in_scope_tvs `unionVarSet` new_tv_set
+ 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 (TcEnv ue te' ve ie (in_scope_tvs', gtvs')) scope
+
+-- 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 s r -> TcM s r
+tcExtendTyVarEnvForMeths sig_tyvars inst_tyvars thing_inside
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
let
- tce' = addListToUFM tce [ (name, (kind, arity, tycon))
- | ((name,arity), (kind,tycon)) <- names_w_arities `zip`
- (kinds `zipLazy` tycons)
- ]
+ te' = extendNameEnv te stuff
in
- tcSetEnv (TcEnv tve tce' ce gve lve gtvs) scope `thenTc` \ result ->
- mapNF_Tc tcDefaultKind kinds `thenNF_Tc_`
- returnTc result
+ tcSetEnv (TcEnv ue te' ve ie gtvs) thing_inside
+ where
+ stuff = [ (getName sig_tv, (kindToTcKind (tyVarKind inst_tv), ATyVar inst_tv))
+ | (sig_tv, inst_tv) <- zipEqual "tcMeth" sig_tyvars inst_tyvars
+ ]
+tcExtendGlobalTyVars extra_global_tvs scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie (in_scope,gtvs)) ->
+ tc_extend_gtvs gtvs extra_global_tvs `thenNF_Tc` \ gtvs' ->
+ tcSetEnv (TcEnv ue te ve ie (in_scope,gtvs')) scope
-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) ->
+tc_extend_gtvs gtvs extra_global_tvs
+ = tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
let
- ce' = addListToUFM ce (names `zip` (kinds `zipLazy` classes))
+ new_global_tyvars = global_tvs `unionVarSet` extra_global_tvs
in
- tcSetEnv (TcEnv tve tce ce' gve lve gtvs) scope `thenTc` \ result ->
- mapNF_Tc tcDefaultKind kinds `thenNF_Tc_`
- returnTc result
+ tcNewMutVar new_global_tyvars
\end{code}
-
-Looking up in the environments.
+@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}
-tcLookupTyVar name
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM tve (panic "tcLookupTyVar") name)
+tcGetGlobalTyVars :: NF_TcM s TcTyVarSet
+tcGetGlobalTyVars
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie (_,gtvs)) ->
+ tcReadMutVar gtvs `thenNF_Tc` \ global_tvs ->
+ zonkTcTyVars (varSetElems global_tvs) `thenNF_Tc` \ global_tys' ->
+ let
+ global_tvs' = (tyVarsOfTypes global_tys')
+ in
+ tcWriteMutVar gtvs global_tvs' `thenNF_Tc_`
+ returnNF_Tc global_tvs'
+tcGetInScopeTyVars :: NF_TcM s [TcTyVar]
+tcGetInScopeTyVars
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie (in_scope_tvs, gtvs)) ->
+ returnNF_Tc (varSetElems in_scope_tvs)
+\end{code}
-tcLookupTyCon (WiredInTyCon tc) -- wired in tycons
- = returnNF_Tc (kindToTcKind (tyConKind tc), synTyConArity tc, tc)
-tcLookupTyCon name
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM tce (panic "tcLookupTyCon") name)
+Type constructors and classes
-tcLookupTyConByKey uniq
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- let
- (kind, arity, tycon) = lookupWithDefaultUFM_Directly tce
- (pprPanic "tcLookupTyCon:" (ppr PprDebug uniq))
- uniq
+\begin{code}
+tcExtendTypeEnv :: [(Name, (TcKind, 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 ue te ve ie gtvs) ->
+ let
+ te' = extendNameEnv te bindings
in
- returnNF_Tc tycon
+ tcSetEnv (TcEnv ue te' ve ie gtvs) scope
+\end{code}
-tcLookupClass name
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- returnNF_Tc (lookupWithDefaultUFM ce (panic "tcLookupClass") name)
-tcLookupClassByKey uniq
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
- let
- (kind, clas) = lookupWithDefaultUFM_Directly ce
- (pprPanic "tcLookupClas:" (ppr PprDebug uniq))
- uniq
- in
- returnNF_Tc clas
+Looking up in the environments.
+
+\begin{code}
+tcLookupTy :: Name -> NF_TcM s (TcKind, TcTyThing)
+tcLookupTy name
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ case lookupNameEnv te name of {
+ Just thing -> returnNF_Tc thing ;
+ Nothing ->
+
+ case maybeWiredInTyConName name of
+ Just tc | isSynTyCon tc -> returnNF_Tc (kindToTcKind (tyConKind tc), ASynTyCon tc (tyConArity tc))
+ | otherwise -> returnNF_Tc (kindToTcKind (tyConKind tc), ADataTyCon tc)
+
+ Nothing -> -- This can happen if an interface-file
+ -- unfolding is screwed up
+ failWithTc (tyNameOutOfScope name)
+ }
+
+tcLookupClassByKey :: Unique -> NF_TcM s Class
+tcLookupClassByKey key
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ case lookupUFM_Directly te key of
+ Just (_, AClass cl _) -> returnNF_Tc cl
+ other -> pprPanic "tcLookupClassByKey:" (pprUnique10 key)
+
+tcLookupClassByKey_maybe :: Unique -> NF_TcM s (Maybe Class)
+tcLookupClassByKey_maybe key
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ case lookupUFM_Directly te key of
+ Just (_, AClass cl _) -> returnNF_Tc (Just cl)
+ other -> returnNF_Tc Nothing
+
+tcLookupTyConByKey :: Unique -> NF_TcM s TyCon
+tcLookupTyConByKey key
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ case lookupUFM_Directly te key of
+ Just (_, ADataTyCon tc) -> returnNF_Tc tc
+ Just (_, ASynTyCon tc _) -> returnNF_Tc tc
+ other -> pprPanic "tcLookupTyConByKey:" (pprUnique10 key)
\end{code}
-Extending and consulting the value environment
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+%************************************************************************
+%* *
+\subsection{The value environment}
+%* *
+%************************************************************************
+
\begin{code}
+tcExtendGlobalValEnv :: [Id] -> TcM s a -> TcM s a
tcExtendGlobalValEnv ids scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
let
- gve' = addListToUFM_Directly gve [(uniqueOf id, id) | id <- ids]
+ ve' = addListToUFM_Directly ve [(getUnique id, id) | id <- ids]
in
- tcSetEnv (TcEnv tve tce ce gve' lve gtvs) scope
+ tcSetEnv (TcEnv ue te ve' ie gtvs) scope
-tcExtendLocalValEnv names ids scope
- = tcGetEnv `thenNF_Tc` \ (TcEnv tve tce ce gve lve gtvs) ->
+tcExtendLocalValEnv :: [(Name,TcId)] -> TcM s a -> TcM s a
+tcExtendLocalValEnv names_w_ids scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie (in_scope_tvs,gtvs)) ->
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
+ ve' = extendNameEnv ve names_w_ids
+ extra_global_tyvars = tyVarsOfTypes (map (idType . snd) names_w_ids)
in
- tcNewMutVar new_global_tyvars `thenNF_Tc` \ gtvs' ->
+ tc_extend_gtvs gtvs extra_global_tyvars `thenNF_Tc` \ gtvs' ->
+ tcSetEnv (TcEnv ue te ve' ie (in_scope_tvs,gtvs')) scope
+\end{code}
+
- tcSetEnv (TcEnv tve tce ce gve lve' gtvs') scope
+\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 ue te ve ie 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 ue te ve ie gtvs) ->
+ returnNF_Tc (lookupNameEnv ve name)
+
+tcLookupValueByKey :: Unique -> NF_TcM s Id -- Panics if not found
+tcLookupValueByKey key
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ returnNF_Tc (explicitLookupValueByKey ve key)
+
+tcLookupValueByKeyMaybe :: Unique -> NF_TcM s (Maybe Id)
+tcLookupValueByKeyMaybe key
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ returnNF_Tc (lookupUFM_Directly ve key)
+
+tcGetValueEnv :: NF_TcM s ValueEnv
+tcGetValueEnv
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie gtvs) ->
+ returnNF_Tc ve
+
+
+tcSetValueEnv :: ValueEnv -> TcM s a -> TcM s a
+tcSetValueEnv ve scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te _ ie gtvs) ->
+ tcSetEnv (TcEnv ue te ve ie 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 -> lookupNameEnv 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
\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.
+Constructing new Ids
\begin{code}
-tcGetGlobalTyVars :: NF_TcM s (TcTyVarSet s)
-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'
+newLocalId :: OccName -> TcType -> SrcLoc -> NF_TcM s TcId
+newLocalId name ty loc
+ = tcGetUnique `thenNF_Tc` \ uniq ->
+ returnNF_Tc (mkUserLocal name uniq ty loc)
+
+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}
+
+%************************************************************************
+%* *
+\subsection{The instance environment}
+%* *
+%************************************************************************
+
\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)
+tcGetInstEnv :: NF_TcM s InstEnv
+tcGetInstEnv = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve ie (_,gtvs)) ->
+ returnNF_Tc ie
-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)
+tcSetInstEnv :: InstEnv -> TcM s a -> TcM s a
+tcSetInstEnv ie scope
+ = tcGetEnv `thenNF_Tc` \ (TcEnv ue te ve _ gtvs) ->
+ tcSetEnv (TcEnv ue te ve ie gtvs) scope
+\end{code}
-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}
+type InstEnv = UniqFM ClsInstEnv -- Maps Class to instances for that class
+type ClsInstEnv = [(TyVarSet, [Type], Id)] -- The instances for a particular class
-tcLookupGlobalValue :: RnName -> NF_TcM s Id
+classInstEnv :: InstEnv -> Class -> ClsInstEnv
+classInstEnv env cls = lookupWithDefaultUFM env [] cls
+\end{code}
-tcLookupGlobalValue (WiredInId id) -- wired in ids
- = returnNF_Tc id
+A @ClsInstEnv@ lives inside a class, and identifies all the instances
+of that class. The @Id@ inside a ClsInstEnv mapping is the dfun for
+that instance.
-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
+If class C maps to a list containing the item ([a,b], [t1,t2,t3], dfun), then
--- A useful function that takes an occurrence of a global thing
--- and instantiates its type with fresh type variables
-tcGlobalOcc :: RnName
- -> NF_TcM s (Id, -- The Id
- [TcType s], -- Instance types
- TcType s) -- Rest of its type
+ forall a b, C t1 t2 t3 can be constructed by dfun
-tcGlobalOcc name
- = tcLookupGlobalValue name `thenNF_Tc` \ id ->
- let
- (tyvars, rho) = splitForAllTy (idType id)
- in
- tcInstTyVars tyvars `thenNF_Tc` \ (tyvars', arg_tys, tenv) ->
- tcInstType tenv rho `thenNF_Tc` \ rho' ->
- returnNF_Tc (id, arg_tys, rho')
+or, to put it another way, we have
+ instance (...) => C t1 t2 t3, witnessed by dfun
-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:" (ppr PprDebug uniq)
-#else
- def = panic "tcLookupGlobalValueByKey"
-#endif
+There is an important consistency constraint in the elements of a ClsInstEnv:
-\end{code}
+ * [a,b] must be a superset of the free vars of [t1,t2,t3]
+ * The dfun must itself be quantified over [a,b]
-Constructing new Ids
-~~~~~~~~~~~~~~~~~~~~
+Thus, the @ClassInstEnv@ for @Eq@ might contain the following entry:
+ [a] ===> dfun_Eq_List :: forall a. Eq a => Eq [a]
+The "a" in the pattern must be one of the forall'd variables in
+the dfun type.
+
+
+
+Notes on overlapping instances
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+In some ClsInstEnvs, overlap is prohibited; that is, no pair of templates unify.
+
+In others, overlap is permitted, but only in such a way that one can make
+a unique choice when looking up. That is, overlap is only permitted if
+one template matches the other, or vice versa. So this is ok:
+
+ [a] [Int]
+
+but this is not
+
+ (Int,a) (b,Int)
+
+If overlap is permitted, the list is kept most specific first, so that
+the first lookup is the right choice.
+
+
+For now we just use association lists.
+
+\subsection{Avoiding a problem with overlapping}
+
+Consider this little program:
+
+\begin{pseudocode}
+ class C a where c :: a
+ class C a => D a where d :: a
+
+ instance C Int where c = 17
+ instance D Int where d = 13
+
+ instance C a => C [a] where c = [c]
+ instance ({- C [a], -} D a) => D [a] where d = c
+
+ instance C [Int] where c = [37]
+
+ main = print (d :: [Int])
+\end{pseudocode}
+
+What do you think `main' prints (assuming we have overlapping instances, and
+all that turned on)? Well, the instance for `D' at type `[a]' is defined to
+be `c' at the same type, and we've got an instance of `C' at `[Int]', so the
+answer is `[37]', right? (the generic `C [a]' instance shouldn't apply because
+the `C [Int]' instance is more specific).
+
+Ghc-4.04 gives `[37]', while ghc-4.06 gives `[17]', so 4.06 is wrong. That
+was easy ;-) Let's just consult hugs for good measure. Wait - if I use old
+hugs (pre-September99), I get `[17]', and stranger yet, if I use hugs98, it
+doesn't even compile! What's going on!?
+
+What hugs complains about is the `D [a]' instance decl.
+
+\begin{pseudocode}
+ ERROR "mj.hs" (line 10): Cannot build superclass instance
+ *** Instance : D [a]
+ *** Context supplied : D a
+ *** Required superclass : C [a]
+\end{pseudocode}
+
+You might wonder what hugs is complaining about. It's saying that you
+need to add `C [a]' to the context of the `D [a]' instance (as appears
+in comments). But there's that `C [a]' instance decl one line above
+that says that I can reduce the need for a `C [a]' instance to the
+need for a `C a' instance, and in this case, I already have the
+necessary `C a' instance (since we have `D a' explicitly in the
+context, and `C' is a superclass of `D').
+
+Unfortunately, the above reasoning indicates a premature commitment to the
+generic `C [a]' instance. I.e., it prematurely rules out the more specific
+instance `C [Int]'. This is the mistake that ghc-4.06 makes. The fix is to
+add the context that hugs suggests (uncomment the `C [a]'), effectively
+deferring the decision about which instance to use.
+
+Now, interestingly enough, 4.04 has this same bug, but it's covered up
+in this case by a little known `optimization' that was disabled in
+4.06. Ghc-4.04 silently inserts any missing superclass context into
+an instance declaration. In this case, it silently inserts the `C
+[a]', and everything happens to work out.
+
+(See `basicTypes/MkId:mkDictFunId' for the code in question. Search for
+`Mark Jones', although Mark claims no credit for the `optimization' in
+question, and would rather it stopped being called the `Mark Jones
+optimization' ;-)
+
+So, what's the fix? I think hugs has it right. Here's why. Let's try
+something else out with ghc-4.04. Let's add the following line:
+
+ d' :: D a => [a]
+ d' = c
+
+Everyone raise their hand who thinks that `d :: [Int]' should give a
+different answer from `d' :: [Int]'. Well, in ghc-4.04, it does. The
+`optimization' only applies to instance decls, not to regular
+bindings, giving inconsistent behavior.
+
+Old hugs had this same bug. Here's how we fixed it: like GHC, the
+list of instances for a given class is ordered, so that more specific
+instances come before more generic ones. For example, the instance
+list for C might contain:
+ ..., C Int, ..., C a, ...
+When we go to look for a `C Int' instance we'll get that one first.
+But what if we go looking for a `C b' (`b' is unconstrained)? We'll
+pass the `C Int' instance, and keep going. But if `b' is
+unconstrained, then we don't know yet if the more specific instance
+will eventually apply. GHC keeps going, and matches on the generic `C
+a'. The fix is to, at each step, check to see if there's a reverse
+match, and if so, abort the search. This prevents hugs from
+prematurely chosing a generic instance when a more specific one
+exists.
+
+--Jeff
\begin{code}
-newMonoIds :: [RnName] -> Kind -> ([TcIdBndr s] -> TcM s a) -> TcM s a
+emptyInstEnv :: InstEnv
+emptyInstEnv = emptyUFM
+\end{code}
-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
+@lookupInstEnv@ looks up in a @InstEnv@, using a one-way match. Since
+the env is kept ordered, the first match must be the only one. The
+thing we are looking up can have an arbitrary "flexi" part.
- mk_id name uniq ty
- = let
- name_str = case (getOccName name) of { Unqual n -> n }
- in
- mkUserLocal name_str uniq ty (getSrcLoc name)
- in
- tcExtendLocalValEnv names new_ids (m new_ids)
+\begin{code}
+lookupInstEnv :: InstEnv -- The envt
+ -> Class -> [Type] -- Key
+ -> InstLookupResult
+
+data InstLookupResult
+ = FoundInst -- There is a (template,substitution) pair
+ -- that makes the template match the key,
+ -- and no template is an instance of the key
+ TyVarSubstEnv Id
+
+ | NoMatch Bool -- Boolean is true iff there is at least one
+ -- template that matches the key.
+ -- (but there are other template(s) that are
+ -- instances of the key, so we don't report
+ -- FoundInst)
+ -- The NoMatch True case happens when we look up
+ -- Foo [a]
+ -- in an InstEnv that has entries for
+ -- Foo [Int]
+ -- Foo [b]
+ -- Then which we choose would depend on the way in which 'a'
+ -- is instantiated. So we say there is no match, but identify
+ -- it as ambiguous case in the hope of giving a better error msg.
+ -- See the notes above from Jeff Lewis
+
+lookupInstEnv env key_cls key_tys
+ = find (classInstEnv env key_cls)
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 mk_id names uniqs tys
- mk_id name uniq ty = TcId (mkUserLocal name uniq ty loc)
- in
- returnNF_Tc new_ids
+ key_vars = tyVarsOfTypes key_tys
+
+ find [] = NoMatch False
+ find ((tpl_tyvars, tpl, val) : rest)
+ = case matchTys tpl_tyvars tpl key_tys of
+ Nothing ->
+ case matchTys key_vars key_tys tpl of
+ Nothing -> find rest
+ Just (_, _) -> NoMatch (any_match rest)
+ Just (subst, leftovers) -> ASSERT( null leftovers )
+ FoundInst subst val
+
+ any_match rest = or [ maybeToBool (matchTys tvs tpl key_tys)
+ | (tvs,tpl,_) <- rest
+ ]
+\end{code}
+
+@addToClsInstEnv@ extends a @ClsInstEnv@, checking for overlaps.
+
+A boolean flag controls overlap reporting.
+
+True => overlap is permitted, but only if one template matches the other;
+ not if they unify but neither is
+
+\begin{code}
+addToInstEnv :: Bool -- True <=> overlap permitted
+ -> InstEnv -- Envt
+ -> Class -> [TyVar] -> [Type] -> Id -- New item
+ -> MaybeErr InstEnv -- Success...
+ ([Type], Id) -- Failure: Offending overlap
+
+addToInstEnv overlap_ok inst_env clas ins_tvs ins_tys value
+ = case insert_into (classInstEnv inst_env clas) of
+ Failed stuff -> Failed stuff
+ Succeeded new_env -> Succeeded (addToUFM inst_env clas new_env)
+
+ where
+ ins_tv_set = mkVarSet ins_tvs
+ ins_item = (ins_tv_set, ins_tys, value)
+
+ insert_into [] = returnMaB [ins_item]
+ insert_into env@(cur_item@(tpl_tvs, tpl_tys, val) : rest)
+
+ -- FAIL if:
+ -- (a) they are the same, or
+ -- (b) they unify, and any sort of overlap is prohibited,
+ -- (c) they unify but neither is more specific than t'other
+ | identical
+ || (unifiable && not overlap_ok)
+ || (unifiable && not (ins_item_more_specific || cur_item_more_specific))
+ = failMaB (tpl_tys, val)
+
+ -- New item is an instance of current item, so drop it here
+ | ins_item_more_specific = returnMaB (ins_item : env)
+
+ -- Otherwise carry on
+ | otherwise = insert_into rest `thenMaB` \ rest' ->
+ returnMaB (cur_item : rest')
+ where
+ unifiable = maybeToBool (unifyTyListsX (ins_tv_set `unionVarSet` tpl_tvs) tpl_tys ins_tys)
+ ins_item_more_specific = maybeToBool (matchTys tpl_tvs tpl_tys ins_tys)
+ cur_item_more_specific = maybeToBool (matchTys ins_tv_set ins_tys tpl_tys)
+ identical = ins_item_more_specific && cur_item_more_specific
\end{code}
+
+%************************************************************************
+%* *
+\subsection{Errors}
+%* *
+%************************************************************************
+
+\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")
+
+uvNameOutOfScope name
+ = ptext SLIT("UVar") <+> quotes (ppr name) <+> ptext SLIT("is not in scope")
+
+tyNameOutOfScope name
+ = quotes (ppr name) <+> ptext SLIT("is not in scope")
+\end{code}