\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnIfaceDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
+module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
#include "HsVersions.h"
import RnExpr
import HsSyn
-import HsDecls ( HsIdInfo(..), HsStrictnessInfo(..) )
import HsPragmas
-import HsTypes ( getTyVarName, pprClassAssertion, cmpHsTypes )
-import RdrName ( RdrName, isRdrDataCon, rdrNameOcc )
+import HsTypes ( getTyVarName, pprHsContext )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar, mkRdrNameWkr )
import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
- extractHsTyVars
+ extractRuleBndrsTyVars, extractHsTyRdrTyVars,
+ extractHsTysRdrTyVars, extractHsCtxtRdrTyVars
)
import RnHsSyn
import HsCore
-import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
-import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn,
- lookupImplicitOccRn, addImplicitOccRn,
- bindLocalsRn,
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr )
+import RnEnv ( bindTyVarsRn, lookupBndrRn, lookupOccRn, getIPName,
+ lookupImplicitOccRn, lookupImplicitOccsRn,
+ bindLocalsRn, bindLocalRn, bindLocalsFVRn, bindUVarRn,
bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
+ bindCoreLocalFVRn, bindCoreLocalsFVRn,
checkDupOrQualNames, checkDupNames,
- newLocallyDefinedGlobalName, newImportedGlobalName,
- newImportedGlobalFromRdrName,
- newDFunName,
- FreeVars, emptyFVs, plusFV, plusFVs, unitFV, addOneFV
+ mkImportedGlobalName, mkImportedGlobalFromRdrName,
+ newDFunName, getDFunKey, newImplicitBinder,
+ FreeVars, emptyFVs, plusFV, plusFVs, unitFV,
+ addOneFV, mapFvRn
)
import RnMonad
+import FunDeps ( oclose )
+import Class ( FunDep )
+
import Name ( Name, OccName,
ExportFlag(..), Provenance(..),
- nameOccName, NamedThing(..),
- mkDefaultMethodOcc, mkDFunOcc
+ nameOccName, NamedThing(..)
)
import NameSet
-import BasicTypes ( TopLevelFlag(..) )
-import TysWiredIn ( tupleTyCon, unboxedTupleTyCon, listTyCon )
-import Type ( funTyCon )
+import OccName ( mkDefaultMethodOcc )
import FiniteMap ( elemFM )
-import PrelInfo ( derivingOccurrences, numClass_RDR,
- deRefStablePtr_NAME, makeStablePtr_NAME,
- bindIO_NAME
+import PrelInfo ( derivableClassKeys, cCallishClassKeys,
+ deRefStablePtr_RDR, makeStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR
)
import Bag ( bagToList )
-import List ( partition )
+import List ( partition, nub )
import Outputable
import SrcLoc ( SrcLoc )
-import CmdLineOpts ( opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
-import UniqFM ( lookupUFM )
+import CmdLineOpts ( opt_GlasgowExts, opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
+import Unique ( Uniquable(..) )
+import ErrUtils ( Message )
+import CStrings ( isCLabelString )
import Maybes ( maybeToBool, catMaybes )
import Util
\end{code}
-rnDecl `renames' declarations.
+@rnDecl@ `renames' declarations.
It simultaneously performs dependency analysis and precedence parsing.
It also does the following error checks:
\begin{enumerate}
\item
Checks that tyvars are used properly. This includes checking
for undefined tyvars, and tyvars in contexts that are ambiguous.
+(Some of this checking has now been moved to module @TcMonoType@,
+since we don't have functional dependency information at this point.)
\item
Checks that all variable occurences are defined.
\item
-Checks the (..) etc constraints in the export list.
+Checks the @(..)@ etc constraints in the export list.
\end{enumerate}
%*********************************************************
\begin{code}
-rnSourceDecls :: [RdrNameHsDecl] -> RnMS s ([RenamedHsDecl], FreeVars)
+rnSourceDecls :: [RdrNameHsDecl] -> RnMS ([RenamedHsDecl], FreeVars)
-- The decls get reversed, but that's ok
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
-
-rnIfaceDecl :: RdrNameHsDecl -> RnMS s RenamedHsDecl
-rnIfaceDecl d
- = rnDecl d `thenRn` \ (d', fvs) ->
- returnRn d'
+ -- 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}
\begin{code}
-- rnDecl does all the work
-rnDecl :: RdrNameHsDecl -> RnMS s (RenamedHsDecl, FreeVars)
+rnDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
returnRn (ValD new_binds, fvs)
rnDecl (SigD (IfaceSig name ty id_infos loc))
= pushSrcLocRn loc $
- lookupBndrRn name `thenRn` \ name' ->
- rnIfaceType doc_str ty `thenRn` \ ty' ->
-
- -- Get the pragma info (if any).
- setModeRn (InterfaceMode Optional) $
- -- In all the rest of the signature we read in optional mode,
- -- so that (a) we don't die
- mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
- returnRn (SigD (IfaceSig name' ty' id_infos' loc), emptyFVs)
- -- Don't need free-var info for iface binds
+ mkImportedGlobalFromRdrName 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)
\end{code}
Renaming type variables is a pain. Because they now contain uniques,
it is necessary to pass in an association list which maps a parsed
-tyvar to its Name representation. In some cases (type signatures of
-values), it is even necessary to go over the type first in order to
-get the set of tyvars used by it, make an assoc list, and then go over
-it again to rename the tyvars! However, we can also do some scoping
-checks at the same time.
+tyvar to its @Name@ representation.
+In some cases (type signatures of values),
+it is even necessary to go over the type first
+in order to get the set of tyvars used by it, make an assoc list,
+and then go over it again to rename the tyvars!
+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))
= pushSrcLocRn src_loc $
- lookupBndrRn tycon `thenRn` \ tycon' ->
- bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
- rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
- checkDupOrQualNames data_doc con_names `thenRn_`
- mapAndUnzipRn rnConDecl condecls `thenRn` \ (condecls', con_fvs_s) ->
- rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
+ lookupBndrRn 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) ->
+ rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
ASSERT(isNoDataPragmas pragmas)
- returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' derivings' noDataPragmas src_loc),
- cxt_fvs `plusFV` plusFVs con_fvs_s `plusFV` deriv_fvs)
+ returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
+ derivings' noDataPragmas src_loc),
+ cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
where
data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
con_names = map conDeclName condecls
= pushSrcLocRn src_loc $
lookupBndrRn name `thenRn` \ name' ->
bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
- rnHsType syn_doc ty `thenRn` \ (ty', ty_fvs) ->
+ rnHsType syn_doc (unquantify 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)
-rnDecl (TyClD (ClassDecl context cname tyvars sigs mbinds pragmas tname dname src_loc))
+ -- 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
+
+rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas
+ tname dname dwname snames src_loc))
= pushSrcLocRn src_loc $
lookupBndrRn cname `thenRn` \ cname' ->
-- 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
- newImportedGlobalFromRdrName tname `thenRn` \ tname' ->
- newImportedGlobalFromRdrName dname `thenRn` \ dname' ->
+ mkImportedGlobalFromRdrName tname `thenRn` \ tname' ->
+ mkImportedGlobalFromRdrName dname `thenRn` \ dname' ->
+ mkImportedGlobalFromRdrName dwname `thenRn` \ dwname' ->
+ mapRn mkImportedGlobalFromRdrName snames `thenRn` \ snames' ->
-- Tyvars scope over bindings and context
- bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
+ bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
-- Check the superclasses
- rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
+ rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
+
+ -- Check the functional dependencies
+ rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
-- Check the signatures
let
- -- Filter out fixity signatures;
- -- they are done at top level
- nofix_sigs = nonFixitySigs sigs
+ -- First process the class op sigs, then the fixity sigs.
+ (op_sigs, non_op_sigs) = partition isClassOpSig 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' ]
in
- checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
- mapAndUnzipRn (rn_op cname' clas_tyvar_names) nofix_sigs `thenRn` \ (sigs', sig_fvs_s) ->
+ renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) ->
-- Check the methods
checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) ->
+ rnMethodBinds mbinds
+ `thenRn` \ (mbinds', meth_fvs) ->
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
-- for instance decls.
ASSERT(isNoClassPragmas pragmas)
- returnRn (TyClD (ClassDecl context' cname' tyvars' sigs' mbinds' NoClassPragmas tname' dname' src_loc),
- plusFVs sig_fvs_s `plusFV` cxt_fvs `plusFV` meth_fvs)
+ returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
+ NoClassPragmas tname' dname' dwname' snames' src_loc),
+ sig_fvs `plusFV`
+ fix_fvs `plusFV`
+ cxt_fvs `plusFV`
+ fds_fvs `plusFV`
+ meth_fvs
+ )
)
where
cls_doc = text "the declaration for class" <+> ppr cname
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]
+ 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 sig@(ClassOpSig op maybe_dm ty locn)
+ rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op dm_rdr_name explicit_dm ty locn)
= pushSrcLocRn locn $
lookupBndrRn op `thenRn` \ op_name ->
-- Check the signature
rnHsSigType (quotes (ppr op)) ty `thenRn` \ (new_ty, op_ty_fvs) ->
let
- check_in_op_ty clas_tyvar = checkRn (clas_tyvar `elemNameSet` op_ty_fvs)
- (classTyVarNotInOpTyErr clas_tyvar sig)
+ check_in_op_ty clas_tyvar =
+ checkRn (clas_tyvar `elemNameSet` oclose clas_fds op_ty_fvs)
+ (classTyVarNotInOpTyErr clas_tyvar sig)
in
- mapRn check_in_op_ty clas_tyvars `thenRn_`
+ mapRn_ check_in_op_ty clas_tyvars `thenRn_`
-- Make the default-method name
- let
- dm_occ = mkDefaultMethodOcc (rdrNameOcc op)
- in
- getModuleRn `thenRn` \ mod_name ->
- getModeRn `thenRn` \ mode ->
- (case (mode, maybe_dm) of
- (SourceMode, _) | op `elem` meth_rdr_names
- -> -- There's an explicit method decl
- newLocallyDefinedGlobalName mod_name dm_occ
- (\_ -> Exported) locn `thenRn` \ dm_name ->
- returnRn (Just dm_name)
-
- (InterfaceMode _, Just _)
- -> -- Imported class that has a default method decl
- newImportedGlobalName mod_name dm_occ `thenRn` \ dm_name ->
- addOccurrenceName dm_name `thenRn_`
- returnRn (Just dm_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)
- other -> returnRn Nothing
- ) `thenRn` \ maybe_dm_name ->
-
-
- returnRn (ClassOpSig op_name maybe_dm_name new_ty locn, op_ty_fvs)
+ InterfaceMode
+ -> -- 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)
+ -- 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) ->
+
+ returnRn (ClassOpSig op_name dm_name final_explicit_dm new_ty locn, op_ty_fvs `plusFV` dm_fvs)
\end{code}
%*********************************************************
\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun src_loc))
+rnDecl (InstD (InstDecl inst_ty mbinds uprags dfun_rdr_name src_loc))
= pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
let
inst_tyvars = case inst_ty' of
HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
-- (Slightly strangely) the forall-d tyvars scope over
-- the method bindings too
in
- extendTyVarEnvFVRn inst_tyvars $
-- Rename the bindings
-- NB meth_names can be qualified!
checkDupNames meth_doc meth_names `thenRn_`
- rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) ->
+ extendTyVarEnvFVRn inst_tyvars (
+ rnMethodBinds mbinds
+ ) `thenRn` \ (mbinds', meth_fvs) ->
let
binders = mkNameSet (map fst (bagToList (collectMonoBinders mbinds')))
in
- renameSigs NotTopLevel True binders uprags `thenRn` \ (new_uprags, prag_fvs) ->
- mkDFunName inst_ty' maybe_dfun src_loc `thenRn` \ dfun_name ->
- addOccurrenceName dfun_name `thenRn_`
- -- The dfun is not optional, because we use its version number
- -- to identify the version of the instance declaration
-
- -- The typechecker checks that all the bindings are for the right class.
- returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags (Just dfun_name) src_loc),
- inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs)
+ -- 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) ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags 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)
rnDecl (DefD (DefaultDecl tys src_loc))
= pushSrcLocRn src_loc $
rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
- lookupImplicitOccRn numClass_RDR `thenRn_`
returnRn (DefD (DefaultDecl tys' src_loc), fvs)
where
doc_str = text "a `default' declaration"
\begin{code}
rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
= pushSrcLocRn src_loc $
- lookupBndrRn name `thenRn` \ name' ->
- (case imp_exp of
- FoImport _ | not isDyn -> addImplicitOccRn name'
- FoLabel -> addImplicitOccRn name'
- FoExport | isDyn ->
- addImplicitOccRn makeStablePtr_NAME `thenRn_`
- addImplicitOccRn deRefStablePtr_NAME `thenRn_`
- addImplicitOccRn bindIO_NAME `thenRn_`
- returnRn name'
- _ -> returnRn name') `thenRn_`
- rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs) ->
- returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc), fvs)
+ lookupOccRn name `thenRn` \ name' ->
+ let
+ extra_fvs FoExport
+ | isDyn =
+ lookupImplicitOccsRn [makeStablePtr_RDR, deRefStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR]
+ | otherwise =
+ lookupImplicitOccsRn [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 = isDynamic ext_nm
+ 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}
%*********************************************************
%* *
+\subsection{Rules}
+%* *
+%*********************************************************
+
+\begin{code}
+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 (HsRule rule_name tvs vars lhs rhs src_loc))
+ = ASSERT( null tvs )
+ pushSrcLocRn src_loc $
+
+ bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
+ bindLocalsFVRn doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
+
+ rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
+ checkRn (validRuleLhs ids lhs')
+ (badRuleLhsErr rule_name lhs') `thenRn_`
+ let
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
+ in
+ mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
+ 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
+ sig_tvs = extractRuleBndrsTyVars vars
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
+\end{code}
+
+
+%*********************************************************
+%* *
\subsection{Support code for type/data declarations}
%* *
%*********************************************************
\begin{code}
-rnDerivs :: Maybe [RdrName] -> RnMS s (Maybe [Name], FreeVars)
+rnDerivs :: Maybe [RdrName] -> RnMS (Maybe [Name], FreeVars)
rnDerivs Nothing -- derivs not specified
= returnRn (Nothing, emptyFVs)
-rnDerivs (Just ds)
- = mapRn rn_deriv ds `thenRn` \ derivs ->
- returnRn (Just derivs, foldl addOneFV emptyFVs derivs)
+rnDerivs (Just clss)
+ = mapRn do_one clss `thenRn` \ clss' ->
+ returnRn (Just clss', mkNameSet clss')
where
- rn_deriv clas
- = lookupOccRn clas `thenRn` \ clas_name ->
-
- -- Now add extra "occurrences" for things that
- -- the deriving mechanism will later need in order to
- -- generate code for this class.
- case lookupUFM derivingOccurrences clas_name of
- Nothing -> addErrRn (derivingNonStdClassErr clas_name) `thenRn_`
- returnRn clas_name
-
- Just occs -> mapRn lookupImplicitOccRn occs `thenRn_`
- returnRn clas_name
-
+ do_one cls = lookupOccRn cls `thenRn` \ clas_name ->
+ checkRn (getUnique clas_name `elem` derivableClassKeys)
+ (derivingNonStdClassErr clas_name) `thenRn_`
+ returnRn clas_name
\end{code}
\begin{code}
conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ _ l) = (n,l)
+conDeclName (ConDecl n _ _ _ _ l) = (n,l)
-rnConDecl :: RdrNameConDecl -> RnMS s (RenamedConDecl, FreeVars)
-rnConDecl (ConDecl name tvs cxt details locn)
+rnConDecl :: RdrNameConDecl -> RnMS (RenamedConDecl, FreeVars)
+rnConDecl (ConDecl name wkr tvs cxt details locn)
= pushSrcLocRn locn $
checkConName name `thenRn_`
lookupBndrRn name `thenRn` \ new_name ->
+
+ mkImportedGlobalFromRdrName wkr `thenRn` \ new_wkr ->
+ -- See comments with ClassDecl
+
bindTyVarsFVRn doc tvs $ \ new_tyvars ->
rnContext doc cxt `thenRn` \ (new_context, cxt_fvs) ->
rnConDetails doc locn details `thenRn` \ (new_details, det_fvs) ->
- returnRn (ConDecl new_name new_tyvars new_context new_details locn,
+ returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn,
cxt_fvs `plusFV` det_fvs)
where
doc = text "the definition of data constructor" <+> quotes (ppr name)
rnConDetails doc locn (VanillaCon tys)
- = mapAndUnzipRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs_s) ->
- returnRn (VanillaCon new_tys, plusFVs fvs_s)
+ = mapFvRn (rnBangTy doc) tys `thenRn` \ (new_tys, fvs) ->
+ returnRn (VanillaCon new_tys, fvs)
rnConDetails doc locn (InfixCon ty1 ty2)
= rnBangTy doc ty1 `thenRn` \ (new_ty1, fvs1) ->
rnConDetails doc locn (RecCon fields)
= checkDupOrQualNames doc field_names `thenRn_`
- mapAndUnzipRn (rnField doc) fields `thenRn` \ (new_fields, fvs_s) ->
- returnRn (RecCon new_fields, plusFVs fvs_s)
+ mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
+ returnRn (RecCon new_fields, fvs)
where
field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
returnRn (Banged new_ty, fvs)
rnBangTy doc (Unbanged ty)
- = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
returnRn (Unbanged new_ty, fvs)
+rnBangTy doc (Unpacked ty)
+ = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
+ returnRn (Unpacked new_ty, fvs)
+
-- This data decl will parse OK
-- data T = a Int
-- treating "a" as the constructor.
%*********************************************************
%* *
-\subsection{Naming a dfun}
-%* *
-%*********************************************************
-
-Make a name for the dict fun for an instance decl
-
-\begin{code}
-mkDFunName :: RenamedHsType -- Instance type
- -> Maybe RdrName -- Dfun thing from decl; Nothing <=> source
- -> SrcLoc
- -> RnMS s Name
-
-mkDFunName inst_ty maybe_df src_loc
- = newDFunName cl_occ tycon_occ maybe_df src_loc
- where
- (cl_occ, tycon_occ) = get_key inst_ty
-
- get_key (HsForAllTy _ _ ty) = get_key ty
- get_key (MonoFunTy _ ty) = get_key ty
- get_key (MonoDictTy cls (ty:_)) = (nameOccName cls, get_tycon_key ty)
-
- get_tycon_key (MonoTyVar tv) = nameOccName (getName tv)
- get_tycon_key (MonoTyApp ty _) = get_tycon_key ty
- get_tycon_key (MonoTupleTy tys True) = getOccName (tupleTyCon (length tys))
- get_tycon_key (MonoTupleTy tys False) = getOccName (unboxedTupleTyCon (length tys))
- get_tycon_key (MonoListTy _) = getOccName listTyCon
- get_tycon_key (MonoFunTy _ _) = getOccName funTyCon
-\end{code}
-
-
-%*********************************************************
-%* *
\subsection{Support code to rename types}
%* *
%*********************************************************
\begin{code}
-rnHsSigType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars)
+rnHsSigType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
-- rnHsSigType is used for source-language type signatures,
-- which use *implicit* universal quantification.
rnHsSigType doc_str ty
= rnHsType (text "the type signature for" <+> doc_str) ty
-rnIfaceType :: SDoc -> RdrNameHsType -> RnMS s RenamedHsType
-rnIfaceType doc ty
- = rnHsType doc ty `thenRn` \ (ty,_) ->
- returnRn ty
-
-
-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 new_tyvars new_ctxt new_ty,
- cxt_fvs `plusFV` ty_fvs)
-
--- 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 explicit_forall doc forall_tyvars ctxt ty
- = mapRn check ctxt `thenRn` \ maybe_ctxt' ->
- returnRn (catMaybes maybe_ctxt')
- -- Remove problem ones, to avoid duplicate error message.
- where
- check ct@(_,tys)
- | forall_mentioned = returnRn (Just ct)
- | otherwise = addErrRn (ctxtErr explicit_forall doc forall_tyvars ct ty) `thenRn_`
- returnRn Nothing
- where
- forall_mentioned = foldr ((||) . any (`elem` forall_tyvars) . extractHsTyVars)
- False
- tys
-
-
-rnHsType :: SDoc -> RdrNameHsType -> RnMS s (RenamedHsType, FreeVars)
+---------------------------------------
+rnHsType :: SDoc -> RdrNameHsType -> RnMS (RenamedHsType, FreeVars)
rnHsType doc (HsForAllTy Nothing ctxt ty)
- -- From source code (no kinds on tyvars)
+ -- 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_tyvars = extractHsTyVars ty
- forall_tyvars = filter (not . (`elemFM` name_env)) mentioned_tyvars
+ 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 False doc forall_tyvars ctxt ty `thenRn` \ ctxt' ->
- rnForAll doc (map UserTyVar forall_tyvars) ctxt' ty
+ rnForAll doc (map UserTyVar forall_tyvars) ctxt ty
-rnHsType doc (HsForAllTy (Just forall_tyvars) ctxt ty)
+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_tyvars = extractHsTyVars ty
- constrained_tyvars = [tv | (_,tys) <- ctxt,
- ty <- tys,
- tv <- extractHsTyVars ty]
- dubious_guys = filter (`notElem` mentioned_tyvars) forall_tyvar_names
- (bad_guys, warn_guys) = partition (`elem` constrained_tyvars) dubious_guys
- 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 = map getTyVarName forall_tyvars
+
+ -- Explicitly quantified but not mentioned in ctxt or tau
+ warn_guys = filter (`notElem` mentioned) forall_tyvar_names
in
- mapRn (forAllErr doc ty) bad_guys `thenRn_`
- mapRn (forAllWarn doc ty) warn_guys `thenRn_`
- checkConstraints True doc forall_tyvar_names ctxt ty `thenRn` \ ctxt' ->
- rnForAll doc forall_tyvars ctxt' ty
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ rnForAll doc forall_tyvars ctxt tau
-rnHsType doc (MonoTyVar tyvar)
+rnHsType doc (HsTyVar tyvar)
= lookupOccRn tyvar `thenRn` \ tyvar' ->
- returnRn (MonoTyVar tyvar', unitFV tyvar')
+ returnRn (HsTyVar tyvar', unitFV tyvar')
-rnHsType doc (MonoFunTy ty1 ty2)
+rnHsType doc (HsFunTy ty1 ty2)
= rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ -- Might find a for-all as the arg of a function type
rnHsType doc ty2 `thenRn` \ (ty2', fvs2) ->
- returnRn (MonoFunTy ty1' ty2', fvs1 `plusFV` fvs2)
-
-rnHsType doc (MonoListTy ty)
- = addImplicitOccRn listTyCon_name `thenRn_`
- rnHsType doc ty `thenRn` \ (ty', fvs) ->
- returnRn (MonoListTy ty', fvs `addOneFV` listTyCon_name)
-
-rnHsType doc (MonoTupleTy tys boxed)
- = addImplicitOccRn tup_con_name `thenRn_`
- rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
- returnRn (MonoTupleTy tys' boxed, fvs `addOneFV` tup_con_name)
+ -- Or as the result. This happens when reading Prelude.hi
+ -- when we find return :: forall m. Monad m -> forall a. a -> m a
+ returnRn (HsFunTy ty1' ty2', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsListTy ty)
+ = rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ 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 (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)
-
-rnHsType doc (MonoDictTy clas tys)
- = lookupOccRn clas `thenRn` \ clas' ->
- rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
- returnRn (MonoDictTy clas' tys', fvs `addOneFV` clas')
+ returnRn (HsAppTy ty1' ty2', fvs1 `plusFV` fvs2)
+
+rnHsType doc (HsPredTy pred)
+ = rnPred doc pred `thenRn` \ (pred', fvs) ->
+ returnRn (HsPredTy pred', fvs)
+
+rnHsType doc (HsUsgForAllTy uv_rdr ty)
+ = bindUVarRn doc uv_rdr $ \ uv_name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsUsgForAllTy uv_name 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 (HsUsgTy usg' ty',
+ usg_fvs `plusFV` ty_fvs)
+ where
+ newUsg usg = case usg of
+ 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
- = mapAndUnzipRn (rnHsType doc) tys `thenRn` \ (tys, fvs_s) ->
- returnRn (tys, plusFVs fvs_s)
+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}
-rnContext :: SDoc -> RdrNameContext -> RnMS s (RenamedContext, FreeVars)
+-- 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)
+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 rn_ctxt ctxt `thenRn` \ (theta, fvs_s) ->
+ = mapAndUnzipRn rn_pred ctxt `thenRn` \ (theta, fvs_s) ->
let
- (_, dup_asserts) = removeDups cmp_assert 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
- rn_ctxt (clas, tys)
- = lookupOccRn clas `thenRn` \ clas_name ->
- rnHsTypes doc tys `thenRn` \ (tys', fvs) ->
- returnRn ((clas_name, tys'), fvs `addOneFV` clas_name)
+ --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)
- cmp_assert (c1,tys1) (c2,tys2)
- = (c1 `compare` c2) `thenCmp` (cmpHsTypes compare tys1 tys2)
+rnPred doc (HsPIParam n ty)
+ = getIPName n `thenRn` \ name ->
+ rnHsType doc ty `thenRn` \ (ty', fvs) ->
+ returnRn (HsPIParam name ty', fvs)
\end{code}
+\begin{code}
+rnFds :: SDoc -> [FunDep RdrName] -> RnMS ([FunDep Name], FreeVars)
+
+rnFds doc fds
+ = mapAndUnzipRn rn_fds fds `thenRn` \ (theta, fvs_s) ->
+ returnRn (theta, plusFVs fvs_s)
+ where
+ rn_fds (tys1, tys2)
+ = rnHsTyVars doc tys1 `thenRn` \ (tys1', fvs1) ->
+ rnHsTyVars doc tys2 `thenRn` \ (tys2', fvs2) ->
+ returnRn ((tys1', tys2'), fvs1 `plusFV` fvs2)
+
+rnHsTyVars doc tvs = mapFvRn (rnHsTyvar doc) tvs
+rnHsTyvar doc tyvar
+ = lookupOccRn tyvar `thenRn` \ tyvar' ->
+ returnRn (tyvar', unitFV tyvar')
+\end{code}
%*********************************************************
-%* *
+%* *
\subsection{IdInfo}
-%* *
+%* *
%*********************************************************
\begin{code}
-rnIdInfo (HsStrictness strict)
- = rnStrict strict `thenRn` \ strict' ->
- returnRn (HsStrictness strict')
-
-rnIdInfo (HsUnfold inline (Just expr)) = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (HsUnfold inline (Just expr'))
-rnIdInfo (HsUnfold inline Nothing) = returnRn (HsUnfold inline Nothing)
-rnIdInfo (HsArity arity) = returnRn (HsArity arity)
-rnIdInfo (HsUpdate update) = returnRn (HsUpdate update)
-rnIdInfo (HsNoCafRefs) = returnRn (HsNoCafRefs)
-rnIdInfo (HsSpecialise tyvars tys expr)
- = bindTyVarsRn doc tyvars $ \ tyvars' ->
- rnCoreExpr expr `thenRn` \ expr' ->
- mapRn (rnIfaceType doc) tys `thenRn` \ tys' ->
- returnRn (HsSpecialise tyvars' tys' expr')
- where
- doc = text "Specialise in interface pragma"
-
+rnIdInfo (HsStrictness str) = returnRn (HsStrictness str, emptyFVs)
-rnStrict (HsStrictnessInfo demands (Just (worker,cons)))
- -- The sole purpose of the "cons" field is so that we can mark the constructors
- -- needed to build the wrapper as "needed", so that their data type decl will be
- -- slurped in. After that their usefulness is o'er, so we just put in the empty list.
+rnIdInfo (HsWorker worker)
= lookupOccRn worker `thenRn` \ worker' ->
- mapRn lookupOccRn cons `thenRn_`
- returnRn (HsStrictnessInfo demands (Just (worker',[])))
+ returnRn (HsWorker worker', unitFV worker')
+
+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)
--- Boring, but necessary for the type checker.
-rnStrict (HsStrictnessInfo demands Nothing) = returnRn (HsStrictnessInfo demands Nothing)
-rnStrict HsBottom = returnRn HsBottom
\end{code}
-UfCore expressions.
+@UfCore@ expressions.
\begin{code}
rnCoreExpr (UfType ty)
- = rnIfaceType (text "unfolding type") ty `thenRn` \ ty' ->
- returnRn (UfType ty')
+ = rnHsType (text "unfolding type") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfType ty', fvs)
rnCoreExpr (UfVar v)
= lookupOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
+ returnRn (UfVar v', unitFV v')
+
+rnCoreExpr (UfLit l)
+ = returnRn (UfLit l, emptyFVs)
-rnCoreExpr (UfCon con args)
- = rnUfCon con `thenRn` \ con' ->
- mapRn rnCoreExpr args `thenRn` \ args' ->
- returnRn (UfCon con' args')
+rnCoreExpr (UfLitLit l ty)
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLit l ty', fvs)
+
+rnCoreExpr (UfCCall cc ty)
+ = rnHsType (text "ccall") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCCall cc ty', fvs)
rnCoreExpr (UfTuple con args)
- = lookupOccRn con `thenRn` \ con' ->
- mapRn rnCoreExpr args `thenRn` \ args' ->
- returnRn (UfTuple con' args')
+ = 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' ->
- rnCoreExpr arg `thenRn` \ arg' ->
- returnRn (UfApp fun' arg')
-
-rnCoreExpr (UfCase scrut bndr alts)
- = rnCoreExpr scrut `thenRn` \ scrut' ->
- bindLocalsRn "a UfCase" [bndr] $ \ [bndr'] ->
- mapRn rnCoreAlt alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' bndr' alts')
+ = rnCoreExpr fun `thenRn` \ (fun', fv1) ->
+ rnCoreExpr arg `thenRn` \ (arg', fv2) ->
+ returnRn (UfApp fun' arg', fv1 `plusFV` fv2)
+
+rnCoreExpr (UfCase scrut bndr alts)
+ = rnCoreExpr scrut `thenRn` \ (scrut', fvs1) ->
+ bindCoreLocalFVRn bndr ( \ bndr' ->
+ mapFvRn rnCoreAlt alts `thenRn` \ (alts', fvs2) ->
+ returnRn (UfCase scrut' bndr' alts', fvs2)
+ ) `thenRn` \ (case', fvs3) ->
+ returnRn (case', fvs1 `plusFV` fvs3)
rnCoreExpr (UfNote note expr)
- = rnNote note `thenRn` \ note' ->
- rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (UfNote note' expr')
+ = rnNote note `thenRn` \ (note', fvs1) ->
+ rnCoreExpr expr `thenRn` \ (expr', fvs2) ->
+ returnRn (UfNote note' expr', fvs1 `plusFV` fvs2)
rnCoreExpr (UfLam bndr body)
= rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
+ rnCoreExpr body `thenRn` \ (body', fvs) ->
+ returnRn (UfLam bndr' body', fvs)
rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
- rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
+ = rnCoreExpr rhs `thenRn` \ (rhs', fvs1) ->
+ rnCoreBndr bndr ( \ bndr' ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfNonRec bndr' rhs') body', fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
rnCoreExpr (UfLet (UfRec pairs) body)
= rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
+ mapFvRn rnCoreExpr rhss `thenRn` \ (rhss', fvs1) ->
+ rnCoreExpr body `thenRn` \ (body', fvs2) ->
+ returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body', fvs1 `plusFV` fvs2)
where
(bndrs, rhss) = unzip pairs
\end{code}
\begin{code}
rnCoreBndr (UfValBinder name ty) thing_inside
- = rnIfaceType (text str) ty `thenRn` \ ty' ->
- bindLocalsRn str [name] $ \ [name'] ->
- thing_inside (UfValBinder name' ty')
+ = rnHsType doc ty `thenRn` \ (ty', fvs1) ->
+ bindCoreLocalFVRn name ( \ name' ->
+ thing_inside (UfValBinder name' ty')
+ ) `thenRn` \ (result, fvs2) ->
+ returnRn (result, fvs1 `plusFV` fvs2)
where
- str = "unfolding id"
+ doc = text "unfolding id"
rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindLocalsRn "an unfolding tyvar" [name] $ \ [name'] ->
+ = bindCoreLocalFVRn name $ \ name' ->
thing_inside (UfTyBinder name' kind)
-rnCoreBndrs bndrs thing_inside -- Expect them all to be ValBinders
- = mapRn (rnIfaceType (text str)) tys `thenRn` \ tys' ->
- bindLocalsRn str names $ \ names' ->
- thing_inside (zipWith UfValBinder names' tys')
- where
- str = "unfolding id"
- names = map (\ (UfValBinder name _ ) -> name) bndrs
- tys = map (\ (UfValBinder _ ty) -> ty) bndrs
+rnCoreBndrs [] thing_inside = thing_inside []
+rnCoreBndrs (b:bs) thing_inside = rnCoreBndr b $ \ name' ->
+ rnCoreBndrs bs $ \ names' ->
+ thing_inside (name':names')
\end{code}
\begin{code}
rnCoreAlt (con, bndrs, rhs)
- = rnUfCon con `thenRn` \ con' ->
- bindLocalsRn "an unfolding alt" bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (con', bndrs', rhs')
-
+ = rnUfCon con bndrs `thenRn` \ (con', fvs1) ->
+ bindCoreLocalsFVRn bndrs ( \ bndrs' ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn ((con', bndrs', rhs'), fvs2)
+ ) `thenRn` \ (result, fvs3) ->
+ returnRn (result, fvs1 `plusFV` fvs3)
rnNote (UfCoerce ty)
- = rnIfaceType (text "unfolding coerce") ty `thenRn` \ ty' ->
- returnRn (UfCoerce ty')
+ = rnHsType (text "unfolding coerce") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfCoerce ty', fvs)
+
+rnNote (UfSCC cc) = returnRn (UfSCC cc, emptyFVs)
+rnNote UfInlineCall = returnRn (UfInlineCall, emptyFVs)
+rnNote UfInlineMe = returnRn (UfInlineMe, emptyFVs)
-rnNote (UfSCC cc) = returnRn (UfSCC cc)
-rnNote UfInlineCall = returnRn UfInlineCall
+rnUfCon UfDefault _
+ = returnRn (UfDefault, emptyFVs)
-rnUfCon UfDefault
- = returnRn UfDefault
+rnUfCon (UfTupleAlt tup_con) bndrs
+ = rnHsTupCon tup_con `thenRn` \ (HsTupCon con' _, fvs) ->
+ returnRn (UfDataAlt con', fvs)
+ -- Makes the type checker a little easier
-rnUfCon (UfDataCon con)
+rnUfCon (UfDataAlt con) _
= lookupOccRn con `thenRn` \ con' ->
- returnRn (UfDataCon con')
+ returnRn (UfDataAlt con', unitFV con')
-rnUfCon (UfLitCon lit)
- = returnRn (UfLitCon lit)
+rnUfCon (UfLitAlt lit) _
+ = returnRn (UfLitAlt lit, emptyFVs)
-rnUfCon (UfLitLitCon lit ty)
- = rnIfaceType (text "litlit") ty `thenRn` \ ty' ->
- returnRn (UfLitLitCon lit ty')
+rnUfCon (UfLitLitAlt lit ty) _
+ = rnHsType (text "litlit") ty `thenRn` \ (ty', fvs) ->
+ returnRn (UfLitLitAlt lit ty', fvs)
+\end{code}
+
+%*********************************************************
+%* *
+\subsection{Rule shapes}
+%* *
+%*********************************************************
-rnUfCon (UfPrimOp op)
- = lookupOccRn op `thenRn` \ op' ->
- returnRn (UfPrimOp op')
+Check the shape of a transformation rule LHS. Currently
+we only allow LHSs of the form @(f e1 .. en)@, where @f@ is
+not one of the @forall@'d variables.
-rnUfCon (UfCCallOp str is_dyn casm gc)
- = returnRn (UfCCallOp str is_dyn casm gc)
+\begin{code}
+validRuleLhs foralls lhs
+ = check lhs
+ where
+ check (HsApp e1 e2) = check e1
+ check (HsVar v) | v `notElem` foralls = True
+ check other = False
\end{code}
+
%*********************************************************
-%* *
+%* *
\subsection{Errors}
-%* *
+%* *
%*********************************************************
\begin{code}
ptext SLIT("does not appear in method signature")])
4 (ppr sig)
-dupClassAssertWarn ctxt (assertion : dups)
- = sep [hsep [ptext SLIT("Duplicate class assertion"),
- quotes (pprClassAssertion assertion),
- ptext SLIT("in the context:")],
- nest 4 (pprContext ctxt <+> ptext SLIT("..."))]
-
badDataCon name
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
forAllWarn doc ty tyvar
| not opt_WarnUnusedMatches = returnRn ()
| otherwise
- = addWarnRn (
+ = 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))]
$$
(ptext SLIT("In") <+> doc))
+ }
forAllErr doc ty tyvar
= addErrRn (
$$
(ptext SLIT("In") <+> doc))
-ctxtErr explicit_forall doc tyvars constraint ty
- = sep [ptext SLIT("The constraint") <+> quotes (pprClassAssertion constraint) <+>
- ptext SLIT("does not mention any of"),
- if explicit_forall then
- nest 4 (ptext SLIT("the universally quantified type variables") <+> braces (interpp'SP tyvars))
- else
- nest 4 (ptext SLIT("the type variables in the type") <+> quotes (ppr ty))
+univErr doc constraint ty
+ = sep [ptext SLIT("All of the type variable(s) in the constraint")
+ <+> quotes (ppr constraint)
+ <+> ptext SLIT("are already in scope"),
+ nest 4 (ptext SLIT("At least one must be universally quantified here"))
]
$$
(ptext SLIT("In") <+> doc)
+
+badRuleLhsErr name lhs
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ nest 4 (ptext SLIT("Illegal left-hand side:") <+> ppr lhs)]
+ $$
+ ptext SLIT("LHS must be of form (f e1 .. en) where f is not forall'd")
+
+badRuleVar name var
+ = sep [ptext SLIT("Rule") <+> ptext name <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
+
+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