\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType, rnHsPolyType ) where
+module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
#include "HsVersions.h"
import RnExpr
import HsSyn
import HsPragmas
-import HsTypes ( getTyVarName, pprHsPred, cmpHsTypes )
-import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar )
+import HsTypes ( hsTyVarNames, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr )
import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
- extractRuleBndrsTyVars, extractHsTyRdrTyVars, extractHsTysRdrTyVars
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsCtxtRdrTyVars, extractGenericPatTyVars
)
import RnHsSyn
import HsCore
-import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr )
-import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, getIPName,
- lookupImplicitOccRn,
- bindLocalsRn, bindLocalRn, bindLocalsFVRn, bindUVarRn,
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName,
+ lookupOrigNames, lookupSysBinder, newLocalsRn,
+ bindLocalsFVRn, bindUVarRn,
bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
- bindCoreLocalFVRn, bindCoreLocalsFVRn,
+ bindCoreLocalFVRn, bindCoreLocalsFVRn, bindLocalNames,
checkDupOrQualNames, checkDupNames,
- mkImportedGlobalName, mkImportedGlobalFromRdrName,
- newDFunName, getDFunKey, newImplicitBinder,
- FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV, mapFvRn
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV,
+ addOneFV, mapFvRn
)
import RnMonad
import FunDeps ( oclose )
-
-import Name ( Name, OccName,
- ExportFlag(..), Provenance(..),
- nameOccName, NamedThing(..)
- )
+import Class ( FunDep, DefMeth (..) )
+import Name ( Name, OccName, nameOccName, NamedThing(..) )
import NameSet
-import OccName ( mkDefaultMethodOcc )
-import BasicTypes ( TopLevelFlag(..) )
+import OccName ( mkDefaultMethodOcc, isTvOcc )
import FiniteMap ( elemFM )
-import PrelInfo ( derivableClassKeys,
- deRefStablePtr_NAME, makeStablePtr_NAME, bindIO_NAME, returnIO_NAME
+import PrelInfo ( derivableClassKeys, cCallishClassKeys )
+import PrelNames ( deRefStablePtr_RDR, makeStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR
)
import Bag ( bagToList )
import List ( partition, nub )
import Outputable
import SrcLoc ( SrcLoc )
-import CmdLineOpts ( opt_GlasgowExts, opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
+import CmdLineOpts ( DynFlags, DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
import Unique ( Uniquable(..) )
-import UniqFM ( lookupUFM )
import ErrUtils ( Message )
import CStrings ( isCLabelString )
-import Maybes ( maybeToBool, catMaybes )
-import Util
+import ListSetOps ( minusList, removeDupsEq )
\end{code}
@rnDecl@ `renames' declarations.
rnSourceDecls decls
= go emptyFVs [] decls
where
- -- Fixity decls have been dealt with already; ignore them
- go fvs ds' [] = returnRn (ds', fvs)
- go fvs ds' (FixD _:ds) = go fvs ds' ds
- go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') ->
- go (fvs `plusFV` fvs') (d':ds') ds
+ -- Fixity and deprecations have been dealt with already; ignore them
+ go fvs ds' [] = returnRn (ds', fvs)
+ go fvs ds' (FixD _:ds) = go fvs ds' ds
+ go fvs ds' (DeprecD _:ds) = go fvs ds' ds
+ go fvs ds' (d:ds) = rnDecl d `thenRn` \(d', fvs') ->
+ go (fvs `plusFV` fvs') (d':ds') ds
\end{code}
rnDecl (SigD (IfaceSig name ty id_infos loc))
= pushSrcLocRn loc $
- lookupBndrRn name `thenRn` \ name' ->
- rnHsPolyType doc_str ty `thenRn` \ (ty',fvs1) ->
- mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
+ lookupTopBndrRn name `thenRn` \ name' ->
+ rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
+ mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2)
where
doc_str = text "the interface signature for" <+> quotes (ppr name)
However, we can also do some scoping checks at the same time.
\begin{code}
-rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc))
+rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas src_loc gen_name1 gen_name2))
= pushSrcLocRn src_loc $
- lookupBndrRn tycon `thenRn` \ tycon' ->
+ lookupTopBndrRn tycon `thenRn` \ tycon' ->
bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
checkDupOrQualNames data_doc con_names `thenRn_`
mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) ->
+ lookupSysBinder gen_name1 `thenRn` \ name1' ->
+ lookupSysBinder gen_name2 `thenRn` \ name2' ->
rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
ASSERT(isNoDataPragmas pragmas)
- returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls'
- derivings' noDataPragmas src_loc),
+ returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
+ derivings' noDataPragmas src_loc name1' name2'),
cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
where
data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
rnDecl (TyClD (TySynonym name tyvars ty src_loc))
= pushSrcLocRn src_loc $
- lookupBndrRn name `thenRn` \ name' ->
+ doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
+ lookupTopBndrRn name `thenRn` \ name' ->
bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
- rnHsPolyType syn_doc (unquantify ty) `thenRn` \ (ty', ty_fvs) ->
+ rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ (ty', ty_fvs) ->
returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs)
where
syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
-- For H98 we do *not* universally quantify on the RHS of a synonym
-- Silently discard context... but the tyvars in the rest won't be in scope
- unquantify (HsForAllTy Nothing ctxt ty) | not opt_GlasgowExts = ty
- unquantify ty = ty
+ unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
+ unquantify glaExys ty = ty
rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas
- tname dname dwname snames src_loc))
+ names src_loc))
= pushSrcLocRn src_loc $
- lookupBndrRn cname `thenRn` \ cname' ->
+ lookupTopBndrRn cname `thenRn` \ cname' ->
-- Deal with the implicit tycon and datacon name
-- They aren't in scope (because they aren't visible to the user)
-- So the 'Imported' part of this call is not relevant.
-- Unclean; but since these two are the only place this happens
-- I can't work up the energy to do it more beautifully
- mkImportedGlobalFromRdrName tname `thenRn` \ tname' ->
- mkImportedGlobalFromRdrName dname `thenRn` \ dname' ->
- mkImportedGlobalFromRdrName dwname `thenRn` \ dwname' ->
- mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' ->
+
+ mapRn lookupSysBinder names `thenRn` \ names' ->
-- Tyvars scope over bindings and context
bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
-- Check the functional dependencies
- rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
+ rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
-- Check the signatures
+ -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
let
- -- First process the class op sigs, then the fixity sigs.
- (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
in
checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) ->
let
- binders = mkNameSet [ nm | (ClassOpSig nm _ _ _ _) <- sigs' ]
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
in
renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) ->
-- Check the methods
+ -- The newLocals call is tiresome: given a generic class decl
+ -- class C a where
+ -- op :: a -> a
+ -- op {| x+y |} (Inl a) = ...
+ -- op {| x+y |} (Inr b) = ...
+ -- op {| a*b |} (a*b) = ...
+ -- we want to name both "x" tyvars with the same unique, so that they are
+ -- easy to group together in the typechecker.
+ -- Hence the
+ getLocalNameEnv `thenRn` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemFM` name_env)]
+ in
checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds
- `thenRn` \ (mbinds', meth_fvs) ->
+ newLocalsRn mkLocalName gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
+ rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
ASSERT(isNoClassPragmas pragmas)
returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
- NoClassPragmas tname' dname' dwname' snames' src_loc),
+ NoClassPragmas names' src_loc),
sig_fvs `plusFV`
+
fix_fvs `plusFV`
cxt_fvs `plusFV`
fds_fvs `plusFV`
sig_doc = text "the signatures for class" <+> ppr cname
meth_doc = text "the default-methods for class" <+> ppr cname
- sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ _ locn <- sigs]
- meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds)
- meth_rdr_names = map fst meth_rdr_names_w_locs
-
- rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op dm_rdr_name explicit_dm ty locn)
+ rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op maybe_dm_stuff ty locn)
= pushSrcLocRn locn $
- lookupBndrRn op `thenRn` \ op_name ->
+ lookupTopBndrRn op `thenRn` \ op_name ->
-- Check the signature
rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) ->
mapRn_ check_in_op_ty clas_tyvars `thenRn_`
-- Make the default-method name
- getModeRn `thenRn` \ mode ->
- (case mode of
- SourceMode -> -- Source class decl
- newImplicitBinder (mkDefaultMethodOcc (rdrNameOcc op)) locn `thenRn` \ dm_name ->
- returnRn (dm_name, op `elem` meth_rdr_names, emptyFVs)
+ (case maybe_dm_stuff of
+ Nothing -> returnRn (Nothing, emptyFVs) -- Source-file class decl
- InterfaceMode
+ Just (DefMeth dm_rdr_name)
-> -- Imported class that has a default method decl
-- See comments with tname, snames, above
- lookupImplicitOccRn dm_rdr_name `thenRn` \ dm_name ->
- returnRn (dm_name, explicit_dm, if explicit_dm then unitFV dm_name else emptyFVs)
+ lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
+ returnRn (Just (DefMeth dm_name), unitFV dm_name)
-- An imported class decl for a class decl that had an explicit default
-- method, mentions, rather than defines,
-- the default method, so we must arrange to pull it in
- ) `thenRn` \ (dm_name, final_explicit_dm, dm_fvs) ->
+ Just GenDefMeth
+ -> returnRn (Just GenDefMeth, emptyFVs)
+ Just NoDefMeth
+ -> returnRn (Just NoDefMeth, emptyFVs)
+ ) `thenRn` \ (maybe_dm_stuff', dm_fvs) ->
- returnRn (ClassOpSig op_name dm_name final_explicit_dm new_ty locn, op_ty_fvs `plusFV` dm_fvs)
+ returnRn (ClassOpSig op_name maybe_dm_stuff' new_ty locn, op_ty_fvs `plusFV` dm_fvs)
\end{code}
%*********************************************************
\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc))
+rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc))
= pushSrcLocRn src_loc $
rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
let
-- Rename the bindings
-- NB meth_names can be qualified!
checkDupNames meth_doc meth_names `thenRn_`
- extendTyVarEnvFVRn inst_tyvars (
- rnMethodBinds mbinds
+ extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
+ rnMethodBinds [] mbinds
) `thenRn` \ (mbinds', meth_fvs) ->
let
- binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds')))
+ binders = collectMonoBinders mbinds'
+ binder_set = mkNameSet binders
in
-- Rename the prags and signatures.
-- Note that the type variables are not in scope here,
-- so that instance Eq a => Eq (T a) where
-- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
-- works OK.
- renameSigs (okInstDclSig binders) uprags `thenRn` \ (new_uprags, prag_fvs) ->
-
- getModeRn `thenRn` \ mode ->
- (case mode of
- InterfaceMode -> lookupImplicitOccRn dfun_rdr_name `thenRn` \ dfun_name ->
- returnRn (dfun_name, unitFV dfun_name)
- SourceMode -> newDFunName (getDFunKey inst_ty') src_loc
- `thenRn` \ dfun_name ->
- returnRn (dfun_name, emptyFVs)
- )
- `thenRn` \ (dfun_name, dfun_fv) ->
+ --
+ -- But the (unqualified) method names are in scope
+ bindLocalNames binders (
+ renameSigs (okInstDclSig binder_set) uprags
+ ) `thenRn` \ (new_uprags, prag_fvs) ->
+
+ (case maybe_dfun_rdr_name of
+ Nothing -> returnRn (Nothing, emptyFVs)
+
+ Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (Just dfun_name, unitFV dfun_name)
+ ) `thenRn` \ (maybe_dfun_name, dfun_fv) ->
-- The typechecker checks that all the bindings are for the right class.
- returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags dfun_name src_loc),
+ returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags maybe_dfun_name src_loc),
inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
where
- meth_doc = text "the bindings in an instance declaration"
- meth_names = bagToList (collectMonoBinders mbinds)
+ meth_doc = text "the bindings in an instance declaration"
+ meth_names = collectLocatedMonoBinders mbinds
\end{code}
%*********************************************************
= pushSrcLocRn src_loc $
lookupOccRn name `thenRn` \ name' ->
let
- ok_ext_nm Dynamic = True
- ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
- ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
-
- fvs1 = case imp_exp of
- FoImport _ | not isDyn -> emptyFVs
- FoLabel -> emptyFVs
- FoExport | isDyn -> mkNameSet [makeStablePtr_NAME,
- deRefStablePtr_NAME,
- bindIO_NAME, returnIO_NAME]
- | otherwise -> mkNameSet [name']
- _ -> emptyFVs
+ extra_fvs FoExport
+ | isDyn = lookupOrigNames [makeStablePtr_RDR, deRefStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR]
+ | otherwise =
+ lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
+ returnRn (addOneFV fvs name')
+ extra_fvs other = returnRn emptyFVs
in
checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
+
+ extra_fvs imp_exp `thenRn` \ fvs1 ->
+
rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
fvs1 `plusFV` fvs2)
where
fo_decl_msg = ptext SLIT("a foreign declaration")
isDyn = isDynamicExtName ext_nm
+
+ ok_ext_nm Dynamic = True
+ ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
+ ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
\end{code}
%*********************************************************
%*********************************************************
\begin{code}
-rnDecl (RuleD (IfaceRuleDecl var body src_loc))
- = pushSrcLocRn src_loc $
- lookupOccRn var `thenRn` \ var' ->
- rnRuleBody body `thenRn` \ (body', fvs) ->
- returnRn (RuleD (IfaceRuleDecl var' body' src_loc), fvs `addOneFV` var')
+rnDecl (RuleD (IfaceRule rule_name vars fn args rhs src_loc))
+ = pushSrcLocRn src_loc $
+ lookupOccRn fn `thenRn` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn (RuleD (IfaceRule rule_name vars' fn' args' rhs' src_loc),
+ (fvs1 `plusFV` fvs2) `addOneFV` fn')
+
+rnDecl (RuleD (IfaceRuleOut fn rule))
+ -- This one is used for BuiltInRules
+ -- The rule itself is already done, but the thing
+ -- to attach it to is not.
+ = lookupOccRn fn `thenRn` \ fn' ->
+ returnRn (RuleD (IfaceRuleOut fn' rule), unitFV fn')
-rnDecl (RuleD (RuleDecl rule_name tvs vars lhs rhs src_loc))
+rnDecl (RuleD (HsRule rule_name tvs vars lhs rhs src_loc))
= ASSERT( null tvs )
pushSrcLocRn src_loc $
bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
in
mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
- returnRn (RuleD (RuleDecl rule_name sig_tvs' vars' lhs' rhs' src_loc),
+ returnRn (RuleD (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc),
fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
where
doc = text "the transformation rule" <+> ptext rule_name
get_var (RuleBndrSig v _) = v
rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
- rn_var (RuleBndrSig v t, id) = rnHsPolyType doc t `thenRn` \ (t', fvs) ->
+ rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
returnRn (RuleBndrSig id t', fvs)
\end{code}
rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars)
rnConDecl (ConDecl name wkr tvs cxt details locn)
= pushSrcLocRn locn $
- checkConName name `thenRn_`
- lookupBndrRn name `thenRn` \ new_name ->
+ checkConName name `thenRn_`
+ lookupTopBndrRn name `thenRn` \ new_name ->
- mkImportedGlobalFromRdrName wkr `thenRn` \ new_wkr ->
+ lookupSysBinder wkr `thenRn` \ new_wkr ->
-- See comments with ClassDecl
bindTyVarsFVRn doc tvs $ \ new_tyvars ->
rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
-rnConDetails doc locn (NewCon ty mb_field)
- = rnHsPolyType doc ty `thenRn` \ (new_ty, fvs) ->
- rn_field mb_field `thenRn` \ new_mb_field ->
- returnRn (NewCon new_ty new_mb_field, fvs)
- where
- rn_field Nothing = returnRn Nothing
- rn_field (Just f) =
- lookupBndrRn f `thenRn` \ new_f ->
- returnRn (Just new_f)
-
rnConDetails doc locn (RecCon fields)
= checkDupOrQualNames doc field_names `thenRn_`
mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
rnField doc (names, ty)
- = mapRn lookupBndrRn names `thenRn` \ new_names ->
+ = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
rnBangTy doc ty `thenRn` \ (new_ty, fvs) ->
returnRn ((new_names, new_ty), fvs)
rnBangTy doc (Banged ty)
- = rnHsPolyType doc ty `thenRn` \ (new_ty, fvs) ->
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
returnRn (Banged new_ty, fvs)
rnBangTy doc (Unbanged ty)
- = rnHsPolyType doc ty `thenRn` \ (new_ty, fvs) ->
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
returnRn (Unbanged new_ty, fvs)
rnBangTy doc (Unpacked ty)
- = rnHsPolyType doc ty `thenRn` \ (new_ty, fvs) ->
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
returnRn (Unpacked new_ty, fvs)
-- This data decl will parse OK
-- rnHsSigType is used for source-language type signatures,
-- which use *implicit* universal quantification.
rnHsSigType doc_str ty
- = rnHsPolyType (text "the type signature for" <+> doc_str) ty
+ = rnHsType (text "the type signature for" <+> doc_str) ty
---------------------------------------
-rnHsPolyType, rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
--- rnHsPolyType is prepared to see a for-all; rnHsType is not
--- The former is called for the top level of type sigs and function args.
+rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
----------------------------------------
-rnHsPolyType doc (HsForAllTy Nothing ctxt ty)
+rnHsType doc (HsForAllTy Nothing ctxt ty)
-- Implicit quantifiction in source code (no kinds on tyvars)
-- Given the signature C => T we universally quantify
-- over FV(T) \ {in-scope-tyvars}
= getLocalNameEnv `thenRn` \ name_env ->
let
- mentioned_in_tau = extractHsTyRdrTyVars ty
- forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_in_tau
+ mentioned_in_tau = extractHsTyRdrTyVars ty
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvars = filter (not . (`elemFM` name_env)) mentioned
in
- checkConstraints doc forall_tyvars mentioned_in_tau ctxt ty `thenRn` \ ctxt' ->
- rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
-rnHsPolyType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
+rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt tau)
-- Explicit quantification.
- -- Check that the forall'd tyvars are a subset of the
- -- free tyvars in the tau-type part
- -- That's only a warning... unless the tyvar is constrained by a
- -- context in which case it's an error
+ -- Check that the forall'd tyvars are actually
+ -- mentioned in the type, and produce a warning if not
= let
- mentioned_in_tau = extractHsTyRdrTyVars tau
- mentioned_in_ctxt = nub [tv | p <- ctxt,
- ty <- tys_of_pred p,
- tv <- extractHsTyRdrTyVars ty]
- tys_of_pred (HsPClass clas tys) = tys
- tys_of_pred (HsPIParam n ty) = [ty]
-
- dubious_guys = filter (`notElem` mentioned_in_tau) forall_tyvar_names
- -- dubious = explicitly quantified but not mentioned in tau type
-
- (bad_guys, warn_guys) = partition (`elem` mentioned_in_ctxt) dubious_guys
- -- bad = explicitly quantified and constrained, but not mentioned in tau
- -- warn = explicitly quantified but not mentioned in ctxt or tau
-
- forall_tyvar_names = map getTyVarName forall_tyvars
+ mentioned_in_tau = extractHsTyRdrTyVars tau
+ mentioned_in_ctxt = extractHsCtxtRdrTyVars ctxt
+ mentioned = nub (mentioned_in_tau ++ mentioned_in_ctxt)
+ forall_tyvar_names = hsTyVarNames forall_tyvars
+
+ -- Explicitly quantified but not mentioned in ctxt or tau
+ warn_guys = filter (`notElem` mentioned) forall_tyvar_names
in
- -- mapRn_ (forAllErr doc tau) bad_guys `thenRn_`
- mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
- checkConstraints doc forall_tyvar_names mentioned_in_tau ctxt tau `thenRn` \ ctxt' ->
- rnForAll doc forall_tyvars ctxt' tau
-
-rnHsPolyType doc other_ty = rnHsType doc other_ty
-
-
--- Check that each constraint mentions at least one of the forall'd type variables
--- Since the forall'd type variables are a subset of the free tyvars
--- of the tau-type part, this guarantees that every constraint mentions
--- at least one of the free tyvars in ty
-checkConstraints doc forall_tyvars tau_vars ctxt ty
- = mapRn (checkPred doc forall_tyvars ty) ctxt `thenRn` \ maybe_ctxt' ->
- returnRn (catMaybes maybe_ctxt')
- -- Remove problem ones, to avoid duplicate error message.
-
-checkPred doc forall_tyvars ty p@(HsPClass clas tys)
- | not_univ = failWithRn Nothing (univErr doc p ty)
- | otherwise = returnRn (Just p)
- where
- ct_vars = extractHsTysRdrTyVars tys
- not_univ = -- At least one of the tyvars in each constraint must
- -- be universally quantified. This restriction isn't in Hugs
- not (any (`elem` forall_tyvars) ct_vars)
-checkPred doc forall_tyvars ty p@(HsPIParam _ _)
- = returnRn (Just p)
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ rnForAll doc forall_tyvars ctxt tau
-rnForAll doc forall_tyvars ctxt ty
- = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars ->
- rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) ->
- rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) ->
- returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty,
- cxt_fvs `plusFV` ty_fvs)
+rnHsType doc (HsTyVar tyvar)
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (HsTyVar tyvar', unitFV tyvar')
----------------------------------------
-rnHsType doc ty@(HsForAllTy _ _ inner_ty)
- = addWarnRn (unexpectedForAllTy ty) `thenRn_`
- rnHsPolyType doc ty
+rnHsType doc (HsOpTy ty1 opname ty2)
+ = lookupOccRn opname `thenRn` \ name' ->
+ rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2',fvs2) ->
+ returnRn (HsOpTy ty1' name' ty2', fvs1 `plusFV` fvs2 `addOneFV` name')
-rnHsType doc (MonoTyVar tyvar)
- = lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar', unitFV tyvar')
+rnHsType doc (HsNumTy i)
+ | i == 1 = returnRn (HsNumTy i, emptyFVs)
+ | otherwise = failWithRn (HsNumTy i, emptyFVs)
+ (ptext SLIT("Only unit numeric type pattern is valid"))
-rnHsType doc (MonoFunTy ty1 ty2)
- = rnHsPolyType doc ty1 `thenRn` \ (ty1', fvs1) ->
+rnHsType doc (HsFunTy ty1 ty2)
+ = rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
-- Might find a for-all as the arg of a function type
- rnHsPolyType doc ty2 `thenRn` \ (ty2', fvs2) ->
+ rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
-- Or as the result. This happens when reading Prelude.hi
-- when we find return :: forall m. Monad m -> forall a. a -> m a
- returnRn (MonoFunTy ty1' ty2', fvs1 `plusFV` fvs2)
+ returnRn (HsFunTy ty1' ty2', fvs1 `plusFV` fvs2)
-rnHsType doc (MonoListTy ty)
+rnHsType doc (HsListTy ty)
= rnHsType doc ty `thenRn` \ (ty', fvs) ->
- returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name)
+ returnRn (HsListTy ty', fvs `addOneFV` listTyCon_name)
-- Unboxed tuples are allowed to have poly-typed arguments. These
-- sometimes crop up as a result of CPR worker-wrappering dictionaries.
-rnHsType doc (MonoTupleTy tys boxed)
- = (if boxed
- then mapFvRn (rnHsType doc) tys
- else mapFvRn (rnHsPolyType doc) tys) `thenRn` \ (tys', fvs) ->
- returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name)
+rnHsType doc (HsTupleTy (HsTupCon _ boxity) tys)
+ -- Don't do lookupOccRn, because this is built-in syntax
+ -- so it doesn't need to be in scope
+ = mapFvRn (rnHsType doc) tys `thenRn` \ (tys', fvs) ->
+ returnRn (HsTupleTy (HsTupCon n' boxity) tys', fvs `addOneFV` n')
where
- tup_con_name = tupleTyCon_name boxed (length tys)
+ n' = tupleTyCon_name boxity (length tys)
+
-rnHsType doc (MonoTyApp ty1 ty2)
+rnHsType doc (HsAppTy ty1 ty2)
= rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
- returnRn (MonoTyApp ty1' ty2', fvs1 `plusFV` fvs2)
+ returnRn (HsAppTy ty1' ty2', fvs1 `plusFV` fvs2)
-rnHsType doc (MonoIParamTy n ty)
- = getIPName n `thenRn` \ name ->
- rnHsType doc ty `thenRn` \ (ty', fvs) ->
- returnRn (MonoIParamTy name ty', fvs)
-
-rnHsType doc (MonoDictTy clas tys)
- = lookupOccRn clas `thenRn` \ clas' ->
- rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
- returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas')
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ (pred', fvs) ->
+ returnRn (HsPredTy pred', fvs)
-rnHsType doc (MonoUsgForAllTy uv_rdr ty)
+rnHsType doc (HsUsgForAllTy uv_rdr ty)
= bindUVarRn doc uv_rdr $ \ uv_name ->
rnHsType doc ty `thenRn` \ (ty', fvs) ->
- returnRn (MonoUsgForAllTy uv_name ty',
+ returnRn (HsUsgForAllTy uv_name ty',
fvs )
-rnHsType doc (MonoUsgTy usg ty)
- = newUsg usg `thenRn` \ (usg', usg_fvs) ->
- rnHsPolyType doc ty `thenRn` \ (ty', ty_fvs) ->
+rnHsType doc (HsUsgTy usg ty)
+ = newUsg usg `thenRn` \ (usg', usg_fvs) ->
+ rnHsType doc ty `thenRn` \ (ty', ty_fvs) ->
-- A for-all can occur inside a usage annotation
- returnRn (MonoUsgTy usg' ty',
+ returnRn (HsUsgTy usg' ty',
usg_fvs `plusFV` ty_fvs)
where
newUsg usg = case usg of
- MonoUsOnce -> returnRn (MonoUsOnce, emptyFVs)
- MonoUsMany -> returnRn (MonoUsMany, emptyFVs)
- MonoUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name ->
- returnRn (MonoUsVar uv_name, emptyFVs)
+ HsUsOnce -> returnRn (HsUsOnce, emptyFVs)
+ HsUsMany -> returnRn (HsUsMany, emptyFVs)
+ HsUsVar uv_rdr -> lookupOccRn uv_rdr `thenRn` \ uv_name ->
+ returnRn (HsUsVar uv_name, emptyFVs)
rnHsTypes doc tys = mapFvRn (rnHsType doc) tys
\end{code}
+\begin{code}
+-- We use lookupOcc here because this is interface file only stuff
+-- and we need the workers...
+rnHsTupCon (HsTupCon n boxity)
+ = lookupOccRn n `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+
+rnHsTupConWkr (HsTupCon n boxity)
+ -- Tuple construtors are for the *worker* of the tuple
+ -- Going direct saves needless messing about
+ = lookupOccRn (mkRdrNameWkr n) `thenRn` \ n' ->
+ returnRn (HsTupCon n' boxity, unitFV n')
+\end{code}
+
+\begin{code}
+rnForAll doc forall_tyvars ctxt ty
+ = bindTyVarsFVRn doc forall_tyvars $ \ new_tyvars ->
+ rnContext doc ctxt `thenRn` \ (new_ctxt, cxt_fvs) ->
+ rnHsType doc ty `thenRn` \ (new_ty, ty_fvs) ->
+ returnRn (mkHsForAllTy (Just new_tyvars) new_ctxt new_ty,
+ cxt_fvs `plusFV` ty_fvs)
+\end{code}
\begin{code}
rnContext :: SDoc -> RdrNameContext -> RnMS (RenamedContext, FreeVars)
-
rnContext doc ctxt
- = mapAndUnzipRn (rnPred doc) ctxt `thenRn` \ (theta, fvs_s) ->
+ = mapAndUnzipRn rn_pred ctxt `thenRn` \ (theta, fvs_s) ->
let
- (_, dup_asserts) = removeDups (cmpHsPred compare) theta
+ (_, dups) = removeDupsEq theta
+ -- We only have equality, not ordering
in
-- Check for duplicate assertions
-- If this isn't an error, then it ought to be:
- mapRn_ (addWarnRn . dupClassAssertWarn theta) dup_asserts `thenRn_`
-
+ mapRn (addWarnRn . dupClassAssertWarn theta) dups `thenRn_`
returnRn (theta, plusFVs fvs_s)
+ where
+ --Someone discovered that @CCallable@ and @CReturnable@
+ -- could be used in contexts such as:
+ -- foo :: CCallable a => a -> PrimIO Int
+ -- Doing this utterly wrecks the whole point of introducing these
+ -- classes so we specifically check that this isn't being done.
+ rn_pred pred = rnPred doc pred `thenRn` \ (pred', fvs)->
+ checkRn (not (bad_pred pred'))
+ (naughtyCCallContextErr pred') `thenRn_`
+ returnRn (pred', fvs)
+
+ bad_pred (HsPClass clas _) = getUnique clas `elem` cCallishClassKeys
+ bad_pred other = False
+
rnPred doc (HsPClass clas tys)
= lookupOccRn clas `thenRn` \ clas_name ->
rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
returnRn (HsPClass clas_name tys', fvs `addOneFV` clas_name)
+
rnPred doc (HsPIParam n ty)
- = getIPName n `thenRn` \ name ->
+ = newIPName n `thenRn` \ name ->
rnHsType doc ty `thenRn` \ (ty', fvs) ->
returnRn (HsPIParam name ty', fvs)
\end{code}
\begin{code}
-rnFds :: SDoc -> [([RdrName],[RdrName])] -> RnMS ([([Name],[Name])], FreeVars)
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS ([FunDep Name], FreeVars)
rnFds doc fds
= mapAndUnzipRn rn_fds fds `thenRn` \ (theta, fvs_s) ->
rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) ->
returnRn (HsUnfold inline expr', fvs)
rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs)
-rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs)
rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs)
rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs)
-rnIdInfo (HsSpecialise rule_body) = rnRuleBody rule_body
- `thenRn` \ (rule_body', fvs) ->
- returnRn (HsSpecialise rule_body', fvs)
-rnRuleBody (UfRuleBody str vars args rhs)
- = rnCoreBndrs vars $ \ vars' ->
- mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
- rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
- returnRn (UfRuleBody str vars' args' rhs', fvs1 `plusFV` fvs2)
\end{code}
@UfCore@ expressions.
\begin{code}
rnCoreExpr (UfType ty)
- = rnHsPolyType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
+ = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
returnRn (UfType ty', fvs)
rnCoreExpr (UfVar v)
returnRn (UfLitLit l ty', fvs)
rnCoreExpr (UfCCall cc ty)
- = rnHsPolyType (text "ccall") ty `thenRn` \ (ty', fvs) ->
+ = rnHsType (text "ccall") ty `thenRn` \ (ty', fvs) ->
returnRn (UfCCall cc ty', fvs)
rnCoreExpr (UfTuple con args)
- = lookupOccRn con `thenRn` \ con' ->
- mapFvRn rnCoreExpr args `thenRn` \ (args', fvs) ->
- returnRn (UfTuple con' args', fvs `addOneFV` con')
+ = rnHsTupConWkr con `thenRn` \ (con', fvs1) ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs2) ->
+ returnRn (UfTuple con' args', fvs1 `plusFV` fvs2)
rnCoreExpr (UfApp fun arg)
= rnCoreExpr fun `thenRn` \ (fun', fv1) ->
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsPolyType doc ty `thenRn` \ (ty', fvs1) ->
+ = rnHsType doc ty `thenRn` \ (ty', fvs1) ->
bindCoreLocalFVRn name ( \ name' ->
thing_inside (UfValBinder name' ty')
) `thenRn` \ (result, fvs2) ->
\begin{code}
rnCoreAlt (con, bndrs, rhs)
- = rnUfCon con `thenRn` \ (con', fvs1) ->
+ = rnUfCon con bndrs `thenRn` \ (con', fvs1) ->
bindCoreLocalsFVRn bndrs ( \ bndrs' ->
rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
returnRn ((con', bndrs', rhs'), fvs2)
returnRn (result, fvs1 `plusFV` fvs3)
rnNote (UfCoerce ty)
- = rnHsPolyType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
returnRn (UfCoerce ty', fvs)
rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs)
rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs)
-rnUfCon UfDefault
+rnUfCon UfDefault _
= returnRn (UfDefault, emptyFVs)
-rnUfCon (UfDataAlt con)
+rnUfCon (UfTupleAlt tup_con) bndrs
+ = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _, fvs) ->
+ returnRn (UfDataAlt con', fvs)
+ -- Makes the type checker a little easier
+
+rnUfCon (UfDataAlt con) _
= lookupOccRn con `thenRn` \ con' ->
returnRn (UfDataAlt con', unitFV con')
-rnUfCon (UfLitAlt lit)
+rnUfCon (UfLitAlt lit) _
= returnRn (UfLitAlt lit, emptyFVs)
-rnUfCon (UfLitLitAlt lit ty)
- = rnHsPolyType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+rnUfCon (UfLitLitAlt lit ty) _
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
returnRn (UfLitLitAlt lit ty', fvs)
\end{code}
ptext SLIT("does not appear in method signature")])
4 (ppr sig)
-dupClassAssertWarn ctxt (assertion : dups)
- = sep [hsep [ptext SLIT("Duplicate class assertion"),
- quotes (pprHsPred assertion),
- ptext SLIT("in the context:")],
- nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))]
-
badDataCon name
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
forAllWarn doc ty tyvar
- | not opt_WarnUnusedMatches = returnRn ()
- | otherwise
- = getModeRn `thenRn` \ mode ->
- case mode of {
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of
+ () | not warn_unused -> returnRn ()
+ | otherwise
+ -> getModeRn `thenRn` \ mode ->
+ case mode of {
#ifndef DEBUG
- InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
- -- unless DEBUG is on, in which case it is slightly
- -- informative. They can arise from mkRhsTyLam,
-#endif -- leading to (say) f :: forall a b. [b] -> [b]
- other ->
-
- addWarnRn (
- sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
- nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
- $$
- (ptext SLIT("In") <+> doc))
- }
-
-forAllErr doc ty tyvar
- = addErrRn (
- sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar),
- nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
- $$
- (ptext SLIT("In") <+> doc))
-
-univErr doc constraint ty
- = sep [ptext SLIT("All of the type variable(s) in the constraint")
- <+> quotes (pprHsPred constraint)
- <+> ptext SLIT("are already in scope"),
- nest 4 (ptext SLIT("At least one must be universally quantified here"))
- ]
- $$
- (ptext SLIT("In") <+> doc)
-
-ambigErr doc constraint ty
- = sep [ptext SLIT("Ambiguous constraint") <+> quotes (pprHsPred constraint),
- nest 4 (ptext SLIT("in the type:") <+> ppr ty),
- nest 4 (ptext SLIT("Each forall-d type variable mentioned by the constraint must appear after the =>."))]
- $$
- (ptext SLIT("In") <+> doc)
-
-unexpectedForAllTy ty
- = ptext SLIT("Unexpected forall type:") <+> ppr ty
+ InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
+ -- unless DEBUG is on, in which case it is slightly
+ -- informative. They can arise from mkRhsTyLam,
+#endif -- leading to (say) f :: forall a b. [b] -> [b]
+ other ->
+ addWarnRn (
+ sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc)
+ )
+ }
badRuleLhsErr name lhs
= sep [ptext SLIT("Rule") <+> ptext name <> colon,
badExtName :: ExtName -> Message
badExtName ext_nm
= sep [quotes (ppr ext_nm) <+> ptext SLIT("is not a valid C identifier")]
+
+dupClassAssertWarn ctxt (assertion : dups)
+ = sep [hsep [ptext SLIT("Duplicate class assertion"),
+ quotes (ppr assertion),
+ ptext SLIT("in the context:")],
+ nest 4 (pprHsContext ctxt <+> ptext SLIT("..."))]
+
+naughtyCCallContextErr (HsPClass clas _)
+ = sep [ptext SLIT("Can't use class") <+> quotes (ppr clas),
+ ptext SLIT("in a context")]
\end{code}
projects / ghc-hetmet.git / blobdiff