tcLookupLocatedGlobal, tcLookupGlobal,
tcLookupGlobalId, tcLookupTyCon, tcLookupClass, tcLookupDataCon,
tcLookupLocatedGlobalId, tcLookupLocatedTyCon,
- tcLookupLocatedClass, tcLookupLocatedDataCon,
+ tcLookupLocatedClass,
- getInGlobalScope,
-
-- Local environment
tcExtendKindEnv,
- tcExtendTyVarEnv, tcExtendTyVarEnv2,
- tcExtendLocalValEnv, tcExtendLocalValEnv2,
+ 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 )
+import HsSyn ( LRuleDecl, LHsBinds, LSig, pprLHsBinds )
import TcIface ( tcImportDecl )
+import TcRnTypes ( pprTcTyThingCategory )
import TcRnMonad
-import TcMType ( zonkTcType, zonkTcTyVar, zonkTcTyVarsAndFV )
-import TcType ( Type, TcKind, TcTyVar, TcTyVarSet,
+import TcMType ( zonkTcType, zonkTcTyVarsAndFV )
+import TcType ( Type, TcKind, TcTyVar, TcTyVarSet, TcType,
tyVarsOfType, tyVarsOfTypes, tcSplitDFunTy, mkGenTyConApp,
- getDFunTyKey, tcTyConAppTyCon, tyVarBindingInfo,
- tidyOpenType, tidyOpenTyVar
+ getDFunTyKey, tcTyConAppTyCon, tcGetTyVar, mkTyVarTy,
+ tidyOpenType
)
import qualified Type ( getTyVar_maybe )
import Id ( idName, isLocalId )
-import Var ( TyVar, Id, idType )
+import Var ( TyVar, Id, idType, tyVarName )
import VarSet
import VarEnv
import RdrName ( extendLocalRdrEnv )
import SrcLoc ( SrcLoc, Located(..) )
import Outputable
-import Maybe ( isJust )
\end{code}
then -- It's defined in this module
case lookupNameEnv (tcg_type_env env) name of
Just thing -> return thing
- Nothing -> notFound "tcLookupGlobal" name
+ Nothing -> notFound name -- Panic!
else do -- It's imported
- { eps <- getEps
- ; hpt <- getHpt
+ { (eps,hpt) <- getEpsAndHpt
; case lookupType hpt (eps_PTE eps) name of
Just thing -> return thing
- Nothing -> do { traceIf (text "tcLookupGlobal" <+> ppr name)
- ; initIfaceTcRn (tcImportDecl name) }
+ Nothing -> tcImportDecl name
}}
\end{code}
tcLookupLocatedGlobalId :: Located Name -> TcM Id
tcLookupLocatedGlobalId = addLocM tcLookupId
-tcLookupLocatedDataCon :: Located Name -> TcM DataCon
-tcLookupLocatedDataCon = addLocM tcLookupDataCon
-
tcLookupLocatedClass :: Located Name -> TcM Class
tcLookupLocatedClass = addLocM tcLookupClass
= tcExtendGlobalEnv [AnId id | id <- ids] thing_inside
\end{code}
-A variety of global lookups, when we know what we are looking for.
-
-\begin{code}
-getInGlobalScope :: TcM (Name -> Bool)
--- Get all things in the global environment; used for deciding what
--- rules to suck in. Anything defined in this module (nameIsLocalOrFrom)
--- is certainly in the envt, so we don't bother to look.
-getInGlobalScope
- = do { mod <- getModule
- ; eps <- getEps
- ; hpt <- getHpt
- ; return (\n -> nameIsLocalOrFrom mod n ||
- isJust (lookupType hpt (eps_PTE eps) n)) }
-\end{code}
-
-
\begin{code}
tcExtendRecEnv :: [(Name,TyThing)] -> TcM r -> TcM r
-- Extend the global environments for the type/class knot tying game
Nothing -> tcLookupGlobal name `thenM` \ thing ->
returnM (AGlobal thing)
-tcLookupTyVar :: Name -> TcM Id
+tcLookupTyVar :: Name -> TcM TcTyVar
tcLookupTyVar name
= tcLookup name `thenM` \ thing ->
case thing of
- ATyVar tv -> returnM tv
- other -> pprPanic "tcLookupTyVar" (ppr name)
+ ATyVar _ ty -> returnM (tcGetTyVar "tcLookupTyVar" ty)
+ other -> pprPanic "tcLookupTyVar" (ppr name)
tcLookupId :: Name -> TcM Id
-- Used when we aren't interested in the binding level
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)
tcExtendTyVarEnv :: [TyVar] -> TcM r -> TcM r
tcExtendTyVarEnv tvs thing_inside
- = tc_extend_tv_env [(getName tv, ATyVar tv) | tv <- tvs] tvs thing_inside
-
-tcExtendTyVarEnv2 :: [(TyVar,TcTyVar)] -> TcM r -> TcM r
-tcExtendTyVarEnv2 tv_pairs thing_inside
- = tc_extend_tv_env [(getName tv1, ATyVar tv2) | (tv1,tv2) <- tv_pairs]
- [tv | (_,tv) <- tv_pairs]
- thing_inside
+ = tcExtendTyVarEnv2 [(tyVarName tv, mkTyVarTy tv) | tv <- tvs] thing_inside
-tc_extend_tv_env binds tyvars thing_inside
+tcExtendTyVarEnv2 :: [(Name,TcType)] -> TcM r -> TcM r
+tcExtendTyVarEnv2 binds thing_inside
= getLclEnv `thenM` \ env@(TcLclEnv {tcl_env = le,
tcl_tyvars = gtvs,
tcl_rdr = rdr_env}) ->
let
- le' = extendNameEnvList le binds
rdr_env' = extendLocalRdrEnv rdr_env (map fst binds)
- new_tv_set = mkVarSet tyvars
+ new_tv_set = tyVarsOfTypes (map snd binds)
+ le' = extendNameEnvList le [(name, ATyVar name ty) | (name, ty) <- binds]
in
-- It's important to add the in-scope tyvars to the global tyvar set
-- as well. Consider
\begin{code}
-tcExtendLocalValEnv :: [TcId] -> TcM a -> TcM a
-tcExtendLocalValEnv ids thing_inside
- = getLclEnv `thenM` \ env ->
- let
- extra_global_tyvars = tyVarsOfTypes [idType id | id <- ids]
- th_lvl = thLevel (tcl_th_ctxt env)
- proc_lvl = proc_level (tcl_arrow_ctxt env)
- extra_env = [(idName id, ATcId id th_lvl proc_lvl) | id <- ids]
- le' = extendNameEnvList (tcl_env env) extra_env
- rdr_env' = extendLocalRdrEnv (tcl_rdr env) (map idName ids)
- in
- tc_extend_gtvs (tcl_tyvars env) extra_global_tyvars `thenM` \ gtvs' ->
- setLclEnv (env {tcl_env = le', tcl_tyvars = gtvs', tcl_rdr = rdr_env'}) thing_inside
-
-tcExtendLocalValEnv2 :: [(Name,TcId)] -> TcM a -> TcM a
-tcExtendLocalValEnv2 names_w_ids thing_inside
+tcExtendIdEnv :: [TcId] -> TcM a -> TcM a
+-- Invariant: the TcIds are fully zonked. Reasons:
+-- (a) The kinds of the forall'd type variables are defaulted
+-- (see Kind.defaultKind, done in zonkQuantifiedTyVar)
+-- (b) There are no via-Indirect occurrences of the bound variables
+-- in the types, because instantiation does not look through such things
+-- (c) The call to tyVarsOfTypes is ok without looking through refs
+tcExtendIdEnv ids thing_inside = tcExtendIdEnv2 [(idName id, id) | id <- ids] thing_inside
+
+tcExtendIdEnv1 :: Name -> TcId -> TcM a -> TcM a
+tcExtendIdEnv1 name id thing_inside = tcExtendIdEnv2 [(name,id)] thing_inside
+
+tcExtendIdEnv2 :: [(Name,TcId)] -> TcM a -> TcM a
+-- Invariant: the TcIds are fully zonked (see tcExtendIdEnv above)
+tcExtendIdEnv2 names_w_ids thing_inside
= getLclEnv `thenM` \ env ->
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)
in
returnM (tidy_env', Just msg)
-find_thing ignore_it tidy_env (ATyVar tv)
- = zonkTcTyVar tv `thenM` \ tv_ty ->
+find_thing ignore_it tidy_env (ATyVar tv ty)
+ = zonkTcType ty `thenM` \ tv_ty ->
if ignore_it tv_ty then
returnM (tidy_env, Nothing)
else let
- (tidy_env1, tv1) = tidyOpenTyVar tidy_env tv
- (tidy_env2, tidy_ty) = tidyOpenType tidy_env1 tv_ty
- msg = sep [ppr tv1 <+> eq_stuff, nest 2 bound_at]
+ -- The name tv is scoped, so we don't need to tidy it
+ (tidy_env1, tidy_ty) = tidyOpenType tidy_env tv_ty
+ 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 == 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 = tyVarBindingInfo tv
+ bound_at = parens $ ptext SLIT("bound at:") <+> ppr (getSrcLoc tv)
in
- returnM (tidy_env2, Just msg)
+ 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 |]
-- Indicates the legal transitions on bracket( [| |] ).
bracketOK :: ThStage -> Maybe ThLevel
bracketOK (Brack _ _ _) = Nothing -- Bracket illegal inside a bracket
-bracketOK stage = (Just (thLevel stage + 1))
+bracketOK stage = Just (thLevel stage + 1)
-- Indicates the legal transitions on splice($).
spliceOK :: ThStage -> Maybe ThLevel
\begin{code}
newDFunName :: Class -> [Type] -> SrcLoc -> TcM Name
newDFunName clas (ty:_) loc
- = newUnique `thenM` \ uniq ->
- returnM (mkInternalName uniq (mkDFunOcc dfun_string) loc)
+ = do { uniq <- newUnique
+ ; return (mkInternalName uniq (mkDFunOcc dfun_string) loc) }
where
-- Any string that is somewhat unique will do
dfun_string = occNameString (getOccName clas) ++ occNameString (getDFunTyKey ty)
\begin{code}
data InstInfo
= InstInfo {
- iDFunId :: DFunId, -- The dfun id
- iBinds :: InstBindings
+ iDFunId :: DFunId, -- The dfun id. Its forall'd type variables
+ iBinds :: InstBindings -- scope over the stuff in InstBindings!
}
data InstBindings
pprInstInfoDetails info = pprInstInfo info $$ nest 2 (details (iBinds info))
where
- details (VanillaInst b _) = ppr b
+ details (VanillaInst b _) = pprLHsBinds b
details (NewTypeDerived _) = text "Derived from the representation type"
simpleInstInfoTy :: InstInfo -> Type
%************************************************************************
\begin{code}
-notFound wheRe name = failWithTc (text wheRe <> colon <+> quotes (ppr name) <+>
- ptext SLIT("is not in scope"))
+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 (ATyCon _)) = ptext SLIT("Type constructor")
- pp_thing (AGlobal (AClass _)) = ptext SLIT("Class")
- pp_thing (AGlobal (AnId _)) = ptext SLIT("Identifier")
- pp_thing (AGlobal (ADataCon _)) = ptext SLIT("Data constructor")
- pp_thing (ATyVar _) = ptext SLIT("Type variable")
- pp_thing (ATcId _ _ _) = ptext SLIT("Local identifier")
\end{code}
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