TyThing(..), TcTyThing(..), TcId,
-- Instance environment, and InstInfo type
- InstInfo(..), pprInstInfo, pprInstInfoDetails,
- simpleInstInfoTy, simpleInstInfoTyCon,
+ InstInfo(..), iDFunId, pprInstInfo, pprInstInfoDetails,
+ simpleInstInfoClsTy, simpleInstInfoTy, simpleInstInfoTyCon,
InstBindings(..),
-- Global environment
tcLookupLocatedClass,
-- Local environment
- tcExtendKindEnv,
+ tcExtendKindEnv, tcExtendKindEnvTvs,
tcExtendTyVarEnv, tcExtendTyVarEnv2,
tcExtendIdEnv, tcExtendIdEnv1, tcExtendIdEnv2,
tcLookup, tcLookupLocated, tcLookupLocalIds,
tcLookupId, tcLookupTyVar,
lclEnvElts, getInLocalScope, findGlobals,
- wrongThingErr,
+ wrongThingErr, pprBinders,
tcExtendRecEnv, -- For knot-tying
checkWellStaged, spliceOK, bracketOK, tcMetaTy, thLevel,
topIdLvl,
- -- Arrow stuff
- checkProcLevel,
-
-- New Ids
newLocalName, newDFunName
) where
#include "HsVersions.h"
-import HsSyn ( LRuleDecl, LHsBinds, LSig, pprLHsBinds )
+import HsSyn ( LRuleDecl, LHsBinds, LSig,
+ LHsTyVarBndr, HsTyVarBndr(..), pprLHsBinds )
import TcIface ( tcImportDecl )
+import IfaceEnv ( newGlobalBinder )
+import TcRnTypes ( pprTcTyThingCategory )
import TcRnMonad
import TcMType ( zonkTcType, zonkTcTyVarsAndFV )
import TcType ( Type, TcKind, TcTyVar, TcTyVarSet, TcType,
- tyVarsOfType, tyVarsOfTypes, tcSplitDFunTy, mkGenTyConApp,
+ tyVarsOfType, tyVarsOfTypes, mkGenTyConApp,
getDFunTyKey, tcTyConAppTyCon, tcGetTyVar, mkTyVarTy,
- tidyOpenType, pprTyThingCategory
+ tidyOpenType
)
import qualified Type ( getTyVar_maybe )
import Id ( idName, isLocalId )
import VarSet
import VarEnv
import RdrName ( extendLocalRdrEnv )
+import InstEnv ( Instance, DFunId, instanceDFunId, instanceHead )
import DataCon ( DataCon )
import TyCon ( TyCon )
import Class ( Class )
import Name ( Name, NamedThing(..), getSrcLoc, mkInternalName, nameIsLocalOrFrom )
import NameEnv
import OccName ( mkDFunOcc, occNameString )
-import HscTypes ( DFunId, extendTypeEnvList, lookupType,
+import HscTypes ( extendTypeEnvList, lookupType,
TyThing(..), tyThingId, tyThingDataCon,
ExternalPackageState(..) )
Just thing -> return thing
Nothing -> tcImportDecl name
}}
-\end{code}
-\begin{code}
tcLookupGlobalId :: Name -> TcM Id
-- Never used for Haskell-source DataCons, hence no ADataCon case
tcLookupGlobalId name
tcLookupId name
= tcLookup name `thenM` \ thing ->
case thing of
- ATcId tc_id _ _ -> returnM tc_id
+ ATcId tc_id _ -> returnM tc_id
AGlobal (AnId id) -> returnM id
other -> pprPanic "tcLookupId" (ppr name)
where
lookup lenv lvl name
= case lookupNameEnv lenv name of
- Just (ATcId id lvl1 _) -> ASSERT( lvl == lvl1 ) id
- other -> pprPanic "tcLookupLocalIds" (ppr name)
+ Just (ATcId id lvl1) -> ASSERT( lvl == lvl1 ) id
+ other -> pprPanic "tcLookupLocalIds" (ppr name)
lclEnvElts :: TcLclEnv -> [TcTyThing]
lclEnvElts env = nameEnvElts (tcl_env env)
upd lcl_env = lcl_env { tcl_env = extend (tcl_env lcl_env) }
extend env = extendNameEnvList env [(n, AThing k) | (n,k) <- things]
+tcExtendKindEnvTvs :: [LHsTyVarBndr Name] -> TcM r -> TcM r
+tcExtendKindEnvTvs bndrs thing_inside
+ = updLclEnv upd thing_inside
+ where
+ upd lcl_env = lcl_env { tcl_env = extend (tcl_env lcl_env) }
+ extend env = extendNameEnvList env pairs
+ pairs = [(n, AThing k) | L _ (KindedTyVar n k) <- bndrs]
+
tcExtendTyVarEnv :: [TyVar] -> TcM r -> TcM r
tcExtendTyVarEnv tvs thing_inside
= tcExtendTyVarEnv2 [(tyVarName tv, mkTyVarTy tv) | tv <- tvs] thing_inside
let
extra_global_tyvars = tyVarsOfTypes [idType id | (name,id) <- names_w_ids]
th_lvl = thLevel (tcl_th_ctxt env)
- proc_lvl = proc_level (tcl_arrow_ctxt env)
- extra_env = [(name, ATcId id th_lvl proc_lvl) | (name,id) <- names_w_ids]
+ extra_env = [(name, ATcId id th_lvl) | (name,id) <- names_w_ids]
le' = extendNameEnvList (tcl_env env) extra_env
rdr_env' = extendLocalRdrEnv (tcl_rdr env) (map fst names_w_ids)
in
ignore_it ty = not (tvs `intersectsVarSet` tyVarsOfType ty)
-----------------------
-find_thing ignore_it tidy_env (ATcId id _ _)
+find_thing ignore_it tidy_env (ATcId id _)
= zonkTcType (idType id) `thenM` \ id_ty ->
if ignore_it id_ty then
returnM (tidy_env, Nothing)
else let
-- The name tv is scoped, so we don't need to tidy it
(tidy_env1, tidy_ty) = tidyOpenType tidy_env tv_ty
- msg = sep [ppr tv <+> eq_stuff, nest 2 bound_at]
+ msg = sep [ptext SLIT("Scoped type variable") <+> quotes (ppr tv) <+> eq_stuff, nest 2 bound_at]
eq_stuff | Just tv' <- Type.getTyVar_maybe tv_ty,
- tv == tyVarName tv' = empty
+ getOccName tv == getOccName tv' = empty
| otherwise = equals <+> ppr tidy_ty
-- It's ok to use Type.getTyVar_maybe because ty is zonked by now
- bound_at = ptext SLIT("bound at:") <+> ppr (getSrcLoc tv)
+ bound_at = parens $ ptext SLIT("bound at:") <+> ppr (getSrcLoc tv)
in
returnM (tidy_env1, Just msg)
\end{code}
%************************************************************************
%* *
- Arrow notation proc levels
-%* *
-%************************************************************************
-
-\begin{code}
-checkProcLevel :: TcId -> ProcLevel -> TcM ()
-checkProcLevel id id_lvl
- = do { banned <- getBannedProcLevels
- ; checkTc (not (id_lvl `elem` banned))
- (procLevelErr id id_lvl) }
-
-procLevelErr id id_lvl
- = hang (ptext SLIT("Command-bound variable") <+> quotes (ppr id) <+> ptext SLIT("is not in scope here"))
- 4 (ptext SLIT("Reason: it is used in the left argument of (-<)"))
-\end{code}
-
-
-%************************************************************************
-%* *
Meta level
%* *
%************************************************************************
topIdLvl :: Id -> ThLevel
-- Globals may either be imported, or may be from an earlier "chunk"
-- (separated by declaration splices) of this module. The former
--- *can* be used inside a top-level splice, but the latter cannot.
+-- *can* be used inside a top-level splice, but the latter cannot.
-- Hence we give the former impLevel, but the latter topLevel
-- E.g. this is bad:
-- x = [| foo |]
returnM (mkInternalName uniq (getOccName name) (getSrcLoc name))
\end{code}
-Make a name for the dict fun for an instance decl. It's a *local*
-name for the moment. The CoreTidy pass will externalise it. Even in
---make and ghci stuff, we rebuild the instance environment each time,
-so the dfun id is internal to begin with, and external when compiling
-other modules
+Make a name for the dict fun for an instance decl. It's an *external*
+name, like otber top-level names, and hence must be made with newGlobalBinder.
\begin{code}
newDFunName :: Class -> [Type] -> SrcLoc -> TcM Name
newDFunName clas (ty:_) loc
- = newUnique `thenM` \ uniq ->
- returnM (mkInternalName uniq (mkDFunOcc dfun_string) loc)
- where
- -- Any string that is somewhat unique will do
- dfun_string = occNameString (getOccName clas) ++ occNameString (getDFunTyKey ty)
+ = do { index <- nextDFunIndex
+ ; is_boot <- tcIsHsBoot
+ ; mod <- getModule
+ ; let info_string = occNameString (getOccName clas) ++
+ occNameString (getDFunTyKey ty)
+ dfun_occ = mkDFunOcc info_string is_boot index
+
+ ; newGlobalBinder mod dfun_occ Nothing loc }
newDFunName clas [] loc = pprPanic "newDFunName" (ppr clas <+> ppr loc)
\end{code}
\begin{code}
data InstInfo
= InstInfo {
- iDFunId :: DFunId, -- The dfun id. Its forall'd type variables
- iBinds :: InstBindings -- scope over the stuff in InstBindings!
+ iSpec :: Instance, -- Includes the dfun id. Its forall'd type
+ iBinds :: InstBindings -- variables scope over the stuff in InstBindings!
}
+iDFunId :: InstInfo -> DFunId
+iDFunId info = instanceDFunId (iSpec info)
+
data InstBindings
= VanillaInst -- The normal case
(LHsBinds Name) -- Bindings
details (VanillaInst b _) = pprLHsBinds b
details (NewTypeDerived _) = text "Derived from the representation type"
+simpleInstInfoClsTy :: InstInfo -> (Class, Type)
+simpleInstInfoClsTy info = case instanceHead (iSpec info) of
+ (_, _, cls, [ty]) -> (cls, ty)
+
simpleInstInfoTy :: InstInfo -> Type
-simpleInstInfoTy info = case tcSplitDFunTy (idType (iDFunId info)) of
- (_, _, _, [ty]) -> ty
+simpleInstInfoTy info = snd (simpleInstInfoClsTy info)
simpleInstInfoTyCon :: InstInfo -> TyCon
-- Gets the type constructor for a simple instance declaration,
%************************************************************************
\begin{code}
+pprBinders :: [Name] -> SDoc
+-- Used in error messages
+-- Use quotes for a single one; they look a bit "busy" for several
+pprBinders [bndr] = quotes (ppr bndr)
+pprBinders bndrs = pprWithCommas ppr bndrs
+
notFound name
= failWithTc (ptext SLIT("GHC internal error:") <+> quotes (ppr name) <+>
ptext SLIT("is not in scope"))
wrongThingErr expected thing name
- = failWithTc (pp_thing thing <+> quotes (ppr name) <+>
+ = failWithTc (pprTcTyThingCategory thing <+> quotes (ppr name) <+>
ptext SLIT("used as a") <+> text expected)
- where
- pp_thing (AGlobal thing) = pprTyThingCategory thing
- pp_thing (ATyVar _ _) = ptext SLIT("Type variable")
- pp_thing (ATcId _ _ _) = ptext SLIT("Local identifier")
\end{code}