\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnTyClDecl, rnIfaceRuleDecl, rnInstDecl, rnSourceDecls,
- ) where
+module RnSource (
+ rnSrcDecls, addTcgDUs,
+ rnTyClDecls, checkModDeprec,
+ rnSplice, checkTH
+ ) where
#include "HsVersions.h"
-import RnExpr
+import {-# SOURCE #-} RnExpr( rnLExpr )
+
import HsSyn
-import HscTypes ( GlobalRdrEnv, AvailEnv )
-import RdrName ( RdrName, isRdrDataCon, elemRdrEnv )
-import RdrHsSyn ( RdrNameConDecl, RdrNameTyClDecl,
- extractGenericPatTyVars
- )
+import RdrName ( RdrName, isRdrDataCon, elemLocalRdrEnv, globalRdrEnvElts,
+ GlobalRdrElt(..), isLocalGRE )
+import RdrHsSyn ( extractGenericPatTyVars, extractHsRhoRdrTyVars )
import RnHsSyn
-import HsCore
-
-import RnTypes ( rnHsType, rnHsSigType, rnHsTypeFVs, rnContext )
-
-import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, renameSigsFVs )
-import RnEnv ( lookupTopBndrRn, lookupOccRn, lookupIfaceName,
- lookupSysBinder, newLocalsRn,
- bindLocalsFVRn, bindPatSigTyVars,
+import RnTypes ( rnLHsType, rnLHsTypes, rnHsSigType, rnHsTypeFVs, rnContext )
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
+import RnEnv ( lookupLocalDataTcNames,
+ lookupLocatedTopBndrRn, lookupLocatedOccRn,
+ lookupOccRn, newLocalsRn,
+ bindLocatedLocalsFV, bindPatSigTyVarsFV,
bindTyVarsRn, extendTyVarEnvFVRn,
- bindCoreLocalRn, bindCoreLocalsRn, bindLocalNames,
- checkDupOrQualNames, checkDupNames, mapFvRn
+ bindLocalNames, checkDupNames, mapFvRn
)
-import RnMonad
+import TcRnMonad
-import Class ( FunDep, DefMeth (..) )
-import TyCon ( DataConDetails(..), visibleDataCons )
-import DataCon ( dataConWorkId )
-import Name ( Name, NamedThing(..) )
+import HscTypes ( FixityEnv, FixItem(..),
+ Deprecations, Deprecs(..), DeprecTxt, plusDeprecs )
+import Class ( FunDep )
+import Name ( Name, nameOccName )
import NameSet
-import PrelNames ( deRefStablePtrName, newStablePtrName,
- bindIOName, returnIOName
- )
-import TysWiredIn ( tupleCon )
-import List ( partition )
+import NameEnv
+import OccName ( occEnvElts )
import Outputable
-import SrcLoc ( SrcLoc )
-import CmdLineOpts ( DynFlag(..) )
- -- Warn of unused for-all'd tyvars
-import Maybes ( maybeToBool )
-import Maybe ( maybe )
+import SrcLoc ( Located(..), unLoc, getLoc, noLoc )
+import DynFlags ( DynFlag(..) )
+import Maybes ( seqMaybe )
+import Maybe ( isNothing )
+import BasicTypes ( Boxity(..) )
\end{code}
@rnSourceDecl@ `renames' declarations.
\end{enumerate}
+\begin{code}
+rnSrcDecls :: HsGroup RdrName -> RnM (TcGblEnv, HsGroup Name)
+
+rnSrcDecls (HsGroup { hs_valds = val_decls,
+ hs_tyclds = tycl_decls,
+ hs_instds = inst_decls,
+ hs_fixds = fix_decls,
+ hs_depds = deprec_decls,
+ hs_fords = foreign_decls,
+ hs_defds = default_decls,
+ hs_ruleds = rule_decls })
+
+ = do { -- Deal with deprecations (returns only the extra deprecations)
+ deprecs <- rnSrcDeprecDecls deprec_decls ;
+ updGblEnv (\gbl -> gbl { tcg_deprecs = tcg_deprecs gbl `plusDeprecs` deprecs })
+ $ do {
+
+ -- Deal with top-level fixity decls
+ -- (returns the total new fixity env)
+ fix_env <- rnSrcFixityDeclsEnv fix_decls ;
+ rn_fix_decls <- rnSrcFixityDecls fix_decls ;
+ updGblEnv (\gbl -> gbl { tcg_fix_env = fix_env })
+ $ do {
+
+ -- Rename other declarations
+ traceRn (text "Start rnmono") ;
+ (rn_val_decls, bind_dus) <- rnTopBinds val_decls ;
+ traceRn (text "finish rnmono" <+> ppr rn_val_decls) ;
+
+ -- You might think that we could build proper def/use information
+ -- for type and class declarations, but they can be involved
+ -- in mutual recursion across modules, and we only do the SCC
+ -- analysis for them in the type checker.
+ -- So we content ourselves with gathering uses only; that
+ -- means we'll only report a declaration as unused if it isn't
+ -- mentioned at all. Ah well.
+ (rn_tycl_decls, src_fvs1)
+ <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls ;
+ (rn_inst_decls, src_fvs2)
+ <- mapFvRn (wrapLocFstM rnSrcInstDecl) inst_decls ;
+ (rn_rule_decls, src_fvs3)
+ <- mapFvRn (wrapLocFstM rnHsRuleDecl) rule_decls ;
+ (rn_foreign_decls, src_fvs4)
+ <- mapFvRn (wrapLocFstM rnHsForeignDecl) foreign_decls ;
+ (rn_default_decls, src_fvs5)
+ <- mapFvRn (wrapLocFstM rnDefaultDecl) default_decls ;
+
+ let {
+ rn_group = HsGroup { hs_valds = rn_val_decls,
+ hs_tyclds = rn_tycl_decls,
+ hs_instds = rn_inst_decls,
+ hs_fixds = rn_fix_decls,
+ hs_depds = [],
+ hs_fords = rn_foreign_decls,
+ hs_defds = rn_default_decls,
+ hs_ruleds = rn_rule_decls } ;
+
+ other_fvs = plusFVs [src_fvs1, src_fvs2, src_fvs3,
+ src_fvs4, src_fvs5] ;
+ src_dus = bind_dus `plusDU` usesOnly other_fvs
+ -- Note: src_dus will contain *uses* for locally-defined types
+ -- and classes, but no *defs* for them. (Because rnTyClDecl
+ -- returns only the uses.) This is a little
+ -- surprising but it doesn't actually matter at all.
+ } ;
+
+ traceRn (text "finish rnSrc" <+> ppr rn_group) ;
+ traceRn (text "finish Dus" <+> ppr src_dus ) ;
+ tcg_env <- getGblEnv ;
+ return (tcg_env `addTcgDUs` src_dus, rn_group)
+ }}}
+
+rnTyClDecls :: [LTyClDecl RdrName] -> RnM [LTyClDecl Name]
+rnTyClDecls tycl_decls = do
+ (decls', fvs) <- mapFvRn (wrapLocFstM rnTyClDecl) tycl_decls
+ return decls'
+
+addTcgDUs :: TcGblEnv -> DefUses -> TcGblEnv
+addTcgDUs tcg_env dus = tcg_env { tcg_dus = tcg_dus tcg_env `plusDU` dus }
+\end{code}
+
+
%*********************************************************
-%* *
-\subsection{Source code declarations}
-%* *
+%* *
+ Source-code fixity declarations
+%* *
%*********************************************************
\begin{code}
-rnSourceDecls :: GlobalRdrEnv -> AvailEnv -> LocalFixityEnv -> RnMode
- -> [RdrNameHsDecl]
- -> RnMG ([RenamedHsDecl], FreeVars)
- -- The decls get reversed, but that's ok
-
-rnSourceDecls gbl_env avails local_fixity_env mode decls
- = initRnMS gbl_env avails emptyRdrEnv local_fixity_env mode (go emptyFVs [] decls)
+rnSrcFixityDecls :: [LFixitySig RdrName] -> RnM [LFixitySig Name]
+rnSrcFixityDecls fix_decls
+ = do fix_decls <- mapM rnFixityDecl fix_decls
+ return (concat fix_decls)
+
+rnFixityDecl :: LFixitySig RdrName -> RnM [LFixitySig Name]
+rnFixityDecl (L loc (FixitySig (L nameLoc rdr_name) fixity))
+ = do names <- lookupLocalDataTcNames rdr_name
+ return [ L loc (FixitySig (L nameLoc name) fixity)
+ | name <- names ]
+
+rnSrcFixityDeclsEnv :: [LFixitySig RdrName] -> RnM FixityEnv
+rnSrcFixityDeclsEnv fix_decls
+ = getGblEnv `thenM` \ gbl_env ->
+ foldlM rnFixityDeclEnv (tcg_fix_env gbl_env)
+ fix_decls `thenM` \ fix_env ->
+ traceRn (text "fixity env" <+> pprFixEnv fix_env) `thenM_`
+ returnM fix_env
+
+rnFixityDeclEnv :: FixityEnv -> LFixitySig RdrName -> RnM FixityEnv
+rnFixityDeclEnv fix_env (L loc (FixitySig rdr_name fixity))
+ = setSrcSpan loc $
+ -- GHC extension: look up both the tycon and data con
+ -- for con-like things
+ -- If neither are in scope, report an error; otherwise
+ -- add both to the fixity env
+ addLocM lookupLocalDataTcNames rdr_name `thenM` \ names ->
+ foldlM add fix_env names
where
- -- 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) = rnSourceDecl d `thenRn` \(d', fvs') ->
- go (fvs `plusFV` fvs') (d':ds') ds
-
-
-rnSourceDecl :: RdrNameHsDecl -> RnMS (RenamedHsDecl, FreeVars)
+ add fix_env name
+ = case lookupNameEnv fix_env name of
+ Just (FixItem _ _ loc')
+ -> addLocErr rdr_name (dupFixityDecl loc') `thenM_`
+ returnM fix_env
+ Nothing -> returnM (extendNameEnv fix_env name fix_item)
+ where
+ fix_item = FixItem (nameOccName name) fixity (getLoc rdr_name)
+
+pprFixEnv :: FixityEnv -> SDoc
+pprFixEnv env
+ = pprWithCommas (\ (FixItem n f _) -> ppr f <+> ppr n)
+ (nameEnvElts env)
+
+dupFixityDecl loc rdr_name
+ = vcat [ptext SLIT("Multiple fixity declarations for") <+> quotes (ppr rdr_name),
+ ptext SLIT("also at ") <+> ppr loc
+ ]
+\end{code}
-rnSourceDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
- returnRn (ValD new_binds, fvs)
-rnSourceDecl (TyClD tycl_decl)
- = rnTyClDecl tycl_decl `thenRn` \ new_decl ->
- finishSourceTyClDecl tycl_decl new_decl `thenRn` \ (new_decl', fvs) ->
- returnRn (TyClD new_decl', fvs `plusFV` tyClDeclFVs new_decl')
+%*********************************************************
+%* *
+ Source-code deprecations declarations
+%* *
+%*********************************************************
-rnSourceDecl (InstD inst)
- = rnInstDecl inst `thenRn` \ new_inst ->
- finishSourceInstDecl inst new_inst `thenRn` \ (new_inst', fvs) ->
- returnRn (InstD new_inst', fvs `plusFV` instDeclFVs new_inst')
+For deprecations, all we do is check that the names are in scope.
+It's only imported deprecations, dealt with in RnIfaces, that we
+gather them together.
-rnSourceDecl (RuleD rule)
- = rnHsRuleDecl rule `thenRn` \ (new_rule, fvs) ->
- returnRn (RuleD new_rule, fvs)
+\begin{code}
+rnSrcDeprecDecls :: [LDeprecDecl RdrName] -> RnM Deprecations
+rnSrcDeprecDecls []
+ = returnM NoDeprecs
+
+rnSrcDeprecDecls decls
+ = mappM (addLocM rn_deprec) decls `thenM` \ pairs_s ->
+ returnM (DeprecSome (mkNameEnv (concat pairs_s)))
+ where
+ rn_deprec (Deprecation rdr_name txt)
+ = lookupLocalDataTcNames rdr_name `thenM` \ names ->
+ returnM [(name, (nameOccName name, txt)) | name <- names]
+
+checkModDeprec :: Maybe DeprecTxt -> Deprecations
+-- Check for a module deprecation; done once at top level
+checkModDeprec Nothing = NoDeprecs
+checkModDeprec (Just txt) = DeprecAll txt
+\end{code}
-rnSourceDecl (ForD ford)
- = rnHsForeignDecl ford `thenRn` \ (new_ford, fvs) ->
- returnRn (ForD new_ford, fvs)
+%*********************************************************
+%* *
+\subsection{Source code declarations}
+%* *
+%*********************************************************
-rnSourceDecl (DefD (DefaultDecl tys src_loc))
- = pushSrcLocRn src_loc $
- mapFvRn (rnHsTypeFVs doc_str) tys `thenRn` \ (tys', fvs) ->
- returnRn (DefD (DefaultDecl tys' src_loc), fvs)
+\begin{code}
+rnDefaultDecl (DefaultDecl tys)
+ = mapFvRn (rnHsTypeFVs doc_str) tys `thenM` \ (tys', fvs) ->
+ returnM (DefaultDecl tys', fvs)
where
doc_str = text "In a `default' declaration"
\end{code}
-
%*********************************************************
%* *
\subsection{Foreign declarations}
%*********************************************************
\begin{code}
-rnHsForeignDecl (ForeignImport name ty spec isDeprec src_loc)
- = pushSrcLocRn src_loc $
- lookupTopBndrRn name `thenRn` \ name' ->
- rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs) ->
- returnRn (ForeignImport name' ty' spec isDeprec src_loc,
- fvs `plusFV` extras spec)
- where
- extras (CImport _ _ _ _ CWrapper) = mkFVs [newStablePtrName,
- deRefStablePtrName,
- bindIOName, returnIOName]
- extras _ = emptyFVs
-
-rnHsForeignDecl (ForeignExport name ty spec isDeprec src_loc)
- = pushSrcLocRn src_loc $
- lookupOccRn name `thenRn` \ name' ->
- rnHsTypeFVs (fo_decl_msg name) ty `thenRn` \ (ty', fvs) ->
- returnRn (ForeignExport name' ty' spec isDeprec src_loc,
- mkFVs [bindIOName, returnIOName] `plusFV` fvs)
-
-fo_decl_msg name = ptext SLIT("The foreign declaration for") <+> ppr name
+rnHsForeignDecl (ForeignImport name ty spec isDeprec)
+ = lookupLocatedTopBndrRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignImport name' ty' spec isDeprec, fvs)
+
+rnHsForeignDecl (ForeignExport name ty spec isDeprec)
+ = lookupLocatedOccRn name `thenM` \ name' ->
+ rnHsTypeFVs (fo_decl_msg name) ty `thenM` \ (ty', fvs) ->
+ returnM (ForeignExport name' ty' spec isDeprec, fvs )
+ -- NB: a foreign export is an *occurrence site* for name, so
+ -- we add it to the free-variable list. It might, for example,
+ -- be imported from another module
+
+fo_decl_msg name = ptext SLIT("In the foreign declaration for") <+> ppr name
\end{code}
%*********************************************************
\begin{code}
-rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
+rnSrcInstDecl (InstDecl inst_ty mbinds uprags)
-- Used for both source and interface file decls
- = pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ inst_ty' ->
-
- (case maybe_dfun_rdr_name of
- Nothing -> returnRn Nothing
- Just dfun_rdr_name -> lookupIfaceName dfun_rdr_name `thenRn` \ dfun_name ->
- returnRn (Just dfun_name)
- ) `thenRn` \ maybe_dfun_name ->
-
- -- The typechecker checks that all the bindings are for the right class.
- returnRn (InstDecl inst_ty' EmptyMonoBinds [] maybe_dfun_name src_loc)
-
--- Compare finishSourceTyClDecl
-finishSourceInstDecl (InstDecl _ mbinds uprags _ _ )
- (InstDecl inst_ty _ _ maybe_dfun_name src_loc)
- -- Used for both source decls only
- = ASSERT( not (maybeToBool maybe_dfun_name) ) -- Source decl!
+ = rnHsSigType (text "an instance decl") inst_ty `thenM` \ inst_ty' ->
+
+ -- Rename the bindings
+ -- The typechecker (not the renamer) checks that all
+ -- the bindings are for the right class
let
meth_doc = text "In the bindings in an instance declaration"
- meth_names = collectLocatedMonoBinders mbinds
- (inst_tyvars, (cls,_)) = getHsInstHead inst_ty
- -- (Slightly strangely) the forall-d tyvars scope over
- -- the method bindings too
+ meth_names = collectHsBindLocatedBinders mbinds
+ (inst_tyvars, _, cls,_) = splitHsInstDeclTy (unLoc inst_ty')
in
-
- -- Rename the bindings
- -- NB meth_names can be qualified!
- checkDupNames meth_doc meth_names `thenRn_`
+ checkDupNames meth_doc meth_names `thenM_`
extendTyVarEnvForMethodBinds inst_tyvars (
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
rnMethodBinds cls [] mbinds
- ) `thenRn` \ (mbinds', meth_fvs) ->
- let
- binders = collectMonoBinders mbinds'
- binder_set = mkNameSet binders
- in
+ ) `thenM` \ (mbinds', meth_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
-- works OK.
--
-- But the (unqualified) method names are in scope
- bindLocalNames binders (
- renameSigsFVs (okInstDclSig binder_set) uprags
- ) `thenRn` \ (uprags', prag_fvs) ->
+ let
+ binders = collectHsBindBinders mbinds'
+ ok_sig = okInstDclSig (mkNameSet binders)
+ in
+ bindLocalNames binders (renameSigs ok_sig uprags) `thenM` \ uprags' ->
- returnRn (InstDecl inst_ty mbinds' uprags' maybe_dfun_name src_loc,
- meth_fvs `plusFV` prag_fvs)
+ returnM (InstDecl inst_ty' mbinds' uprags',
+ meth_fvs `plusFV` hsSigsFVs uprags'
+ `plusFV` extractHsTyNames inst_ty')
\end{code}
+For the method bindings in class and instance decls, we extend the
+type variable environment iff -fglasgow-exts
+
+\begin{code}
+extendTyVarEnvForMethodBinds tyvars thing_inside
+ = doptM Opt_GlasgowExts `thenM` \ opt_GlasgowExts ->
+ if opt_GlasgowExts then
+ extendTyVarEnvFVRn (map hsLTyVarName tyvars) thing_inside
+ else
+ thing_inside
+\end{code}
+
+
%*********************************************************
%* *
\subsection{Rules}
%*********************************************************
\begin{code}
-rnIfaceRuleDecl (IfaceRule rule_name act vars fn args rhs src_loc)
- = pushSrcLocRn src_loc $
- lookupOccRn fn `thenRn` \ fn' ->
- rnCoreBndrs vars $ \ vars' ->
- mapRn rnCoreExpr args `thenRn` \ args' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (IfaceRule rule_name act vars' fn' args' rhs' src_loc)
-
-rnIfaceRuleDecl (IfaceRuleOut fn rule) -- Builtin rules come this way
- = lookupOccRn fn `thenRn` \ fn' ->
- returnRn (IfaceRuleOut fn' rule)
-
-rnHsRuleDecl (HsRule rule_name act vars lhs rhs src_loc)
- = pushSrcLocRn src_loc $
- bindPatSigTyVars (collectRuleBndrSigTys vars) $
-
- 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_`
+rnHsRuleDecl (HsRule rule_name act vars lhs rhs)
+ = bindPatSigTyVarsFV (collectRuleBndrSigTys vars) $
+
+ bindLocatedLocalsFV doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenM` \ (vars', fv_vars) ->
+
+ rnLExpr lhs `thenM` \ (lhs', fv_lhs) ->
+ rnLExpr rhs `thenM` \ (rhs', fv_rhs) ->
+ let
+ mb_bad = validRuleLhs ids lhs'
+ in
+ checkErr (isNothing mb_bad)
+ (badRuleLhsErr rule_name lhs' mb_bad) `thenM_`
let
bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
in
- mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
- returnRn (HsRule rule_name act vars' lhs' rhs' src_loc,
- fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
+ mappM (addErr . badRuleVar rule_name) bad_vars `thenM_`
+ returnM (HsRule rule_name act vars' lhs' rhs',
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
where
- doc = text "In the transformation rule" <+> ptext rule_name
+ doc = text "In the transformation rule" <+> ftext rule_name
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) = rnHsTypeFVs doc t `thenRn` \ (t', fvs) ->
- returnRn (RuleBndrSig id t', fvs)
+ rn_var (RuleBndr (L loc v), id)
+ = returnM (RuleBndr (L loc id), emptyFVs)
+ rn_var (RuleBndrSig (L loc v) t, id)
+ = rnHsTypeFVs doc t `thenM` \ (t', fvs) ->
+ returnM (RuleBndrSig (L loc id) t', fvs)
+\end{code}
+
+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. We also restrict the form of the LHS so
+that it may be plausibly matched. Basically you only get to write ordinary
+applications. (E.g. a case expression is not allowed: too elaborate.)
+
+NB: if you add new cases here, make sure you add new ones to TcRule.ruleLhsTvs
+
+\begin{code}
+validRuleLhs :: [Name] -> LHsExpr Name -> Maybe (HsExpr Name)
+-- Nothing => OK
+-- Just e => Not ok, and e is the offending expression
+validRuleLhs foralls lhs
+ = checkl lhs
+ where
+ checkl (L loc e) = check e
+
+ check (OpApp e1 op _ e2) = checkl op `seqMaybe` checkl_e e1 `seqMaybe` checkl_e e2
+ check (HsApp e1 e2) = checkl e1 `seqMaybe` checkl_e e2
+ check (HsVar v) | v `notElem` foralls = Nothing
+ check other = Just other -- Failure
+
+ checkl_e (L loc e) = check_e e
+
+ check_e (HsVar v) = Nothing
+ check_e (HsPar e) = checkl_e e
+ check_e (HsLit e) = Nothing
+ check_e (HsOverLit e) = Nothing
+
+ check_e (OpApp e1 op _ e2) = checkl_e e1 `seqMaybe` checkl_e op `seqMaybe` checkl_e e2
+ check_e (HsApp e1 e2) = checkl_e e1 `seqMaybe` checkl_e e2
+ check_e (NegApp e _) = checkl_e e
+ check_e (ExplicitList _ es) = checkl_es es
+ check_e (ExplicitTuple es _) = checkl_es es
+ check_e other = Just other -- Fails
+
+ checkl_es es = foldr (seqMaybe . checkl_e) Nothing es
+
+badRuleLhsErr name lhs (Just bad_e)
+ = sep [ptext SLIT("Rule") <+> ftext name <> colon,
+ nest 4 (vcat [ptext SLIT("Illegal expression:") <+> ppr bad_e,
+ ptext SLIT("in 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") <+> doubleQuotes (ftext name) <> colon,
+ ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
+ ptext SLIT("does not appear on left hand side")]
\end{code}
However, we can also do some scoping checks at the same time.
\begin{code}
-rnTyClDecl (IfaceSig {tcdName = name, tcdType = ty, tcdIdInfo = id_infos, tcdLoc = loc})
- = pushSrcLocRn loc $
- lookupTopBndrRn name `thenRn` \ name' ->
- rnHsType doc_str ty `thenRn` \ ty' ->
- mapRn rnIdInfo id_infos `thenRn` \ id_infos' ->
- returnRn (IfaceSig {tcdName = name', tcdType = ty', tcdIdInfo = id_infos', tcdLoc = loc})
- where
- doc_str = text "In the interface signature for" <+> quotes (ppr name)
-
-rnTyClDecl (CoreDecl {tcdName = name, tcdType = ty, tcdRhs = rhs, tcdLoc = loc})
- = pushSrcLocRn loc $
- lookupTopBndrRn name `thenRn` \ name' ->
- rnHsType doc_str ty `thenRn` \ ty' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (CoreDecl {tcdName = name', tcdType = ty', tcdRhs = rhs', tcdLoc = loc})
- where
- doc_str = text "In the Core declaration for" <+> quotes (ppr name)
+rnTyClDecl (ForeignType {tcdLName = name, tcdFoType = fo_type, tcdExtName = ext_name})
+ = lookupLocatedTopBndrRn name `thenM` \ name' ->
+ returnM (ForeignType {tcdLName = name', tcdFoType = fo_type, tcdExtName = ext_name},
+ emptyFVs)
-rnTyClDecl (ForeignType {tcdName = name, tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
- = pushSrcLocRn loc $
- lookupTopBndrRn name `thenRn` \ name' ->
- returnRn (ForeignType {tcdName = name', tcdFoType = fo_type, tcdExtName = ext_name, tcdLoc = loc})
-
-rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdName = tycon,
+rnTyClDecl (TyData {tcdND = new_or_data, tcdCtxt = context, tcdLName = tycon,
tcdTyVars = tyvars, tcdCons = condecls,
- tcdDerivs = derivs, tcdLoc = src_loc, tcdSysNames = sys_names})
- = pushSrcLocRn src_loc $
- lookupTopBndrRn tycon `thenRn` \ tycon' ->
+ tcdKindSig = sig, tcdDerivs = derivs})
+ | is_vanilla -- Normal Haskell data type decl
+ = ASSERT( isNothing sig ) -- In normal H98 form, kind signature on the
+ -- data type is syntactically illegal
bindTyVarsRn data_doc tyvars $ \ tyvars' ->
- rnContext data_doc context `thenRn` \ context' ->
- rn_derivs derivs `thenRn` \ derivs' ->
- checkDupOrQualNames data_doc con_names `thenRn_`
-
- rnConDecls tycon' condecls `thenRn` \ condecls' ->
- mapRn lookupSysBinder sys_names `thenRn` \ sys_names' ->
- returnRn (TyData {tcdND = new_or_data, tcdCtxt = context', tcdName = tycon',
- tcdTyVars = tyvars', tcdCons = condecls',
- tcdDerivs = derivs', tcdLoc = src_loc, tcdSysNames = sys_names'})
+ do { tycon' <- lookupLocatedTopBndrRn tycon
+ ; context' <- rnContext data_doc context
+ ; (derivs', deriv_fvs) <- rn_derivs derivs
+ ; checkDupNames data_doc con_names
+ ; condecls' <- rnConDecls (unLoc tycon') condecls
+ ; returnM (TyData {tcdND = new_or_data, tcdCtxt = context', tcdLName = tycon',
+ tcdTyVars = tyvars', tcdKindSig = Nothing, tcdCons = condecls',
+ tcdDerivs = derivs'},
+ delFVs (map hsLTyVarName tyvars') $
+ extractHsCtxtTyNames context' `plusFV`
+ plusFVs (map conDeclFVs condecls') `plusFV`
+ deriv_fvs) }
+
+ | otherwise -- GADT
+ = do { tycon' <- lookupLocatedTopBndrRn tycon
+ ; checkTc (null (unLoc context)) (badGadtStupidTheta tycon)
+ ; tyvars' <- bindTyVarsRn data_doc tyvars
+ (\ tyvars' -> return tyvars')
+ -- For GADTs, the type variables in the declaration
+ -- do not scope over the constructor signatures
+ -- data T a where { T1 :: forall b. b-> b }
+ ; (derivs', deriv_fvs) <- rn_derivs derivs
+ ; checkDupNames data_doc con_names
+ ; condecls' <- rnConDecls (unLoc tycon') condecls
+ ; returnM (TyData {tcdND = new_or_data, tcdCtxt = noLoc [], tcdLName = tycon',
+ tcdTyVars = tyvars', tcdCons = condecls', tcdKindSig = sig,
+ tcdDerivs = derivs'},
+ plusFVs (map conDeclFVs condecls') `plusFV` deriv_fvs) }
+
where
+ is_vanilla = case condecls of -- Yuk
+ [] -> True
+ L _ (ConDecl { con_res = ResTyH98 }) : _ -> True
+ other -> False
+
data_doc = text "In the data type declaration for" <+> quotes (ppr tycon)
- con_names = map conDeclName (visibleDataCons condecls)
+ con_names = map con_names_helper condecls
- rn_derivs Nothing = returnRn Nothing
- rn_derivs (Just ds) = rnContext data_doc ds `thenRn` \ ds' -> returnRn (Just ds')
+ con_names_helper (L _ c) = con_name c
+
+ rn_derivs Nothing = returnM (Nothing, emptyFVs)
+ rn_derivs (Just ds) = rnLHsTypes data_doc ds `thenM` \ ds' ->
+ returnM (Just ds', extractHsTyNames_s ds')
-rnTyClDecl (TySynonym {tcdName = name, tcdTyVars = tyvars, tcdSynRhs = ty, tcdLoc = src_loc})
- = pushSrcLocRn src_loc $
- lookupTopBndrRn name `thenRn` \ name' ->
+rnTyClDecl (TySynonym {tcdLName = name, tcdTyVars = tyvars, tcdSynRhs = ty})
+ = lookupLocatedTopBndrRn name `thenM` \ name' ->
bindTyVarsRn syn_doc tyvars $ \ tyvars' ->
- rnHsType syn_doc ty `thenRn` \ ty' ->
- returnRn (TySynonym {tcdName = name', tcdTyVars = tyvars', tcdSynRhs = ty', tcdLoc = src_loc})
+ rnHsTypeFVs syn_doc ty `thenM` \ (ty', fvs) ->
+ returnM (TySynonym {tcdLName = name', tcdTyVars = tyvars',
+ tcdSynRhs = ty'},
+ delFVs (map hsLTyVarName tyvars') fvs)
where
syn_doc = text "In the declaration for type synonym" <+> quotes (ppr name)
-rnTyClDecl (ClassDecl {tcdCtxt = context, tcdName = cname,
+rnTyClDecl (ClassDecl {tcdCtxt = context, tcdLName = cname,
tcdTyVars = tyvars, tcdFDs = fds, tcdSigs = sigs,
- tcdSysNames = names, tcdLoc = src_loc})
- -- Used for both source and interface file decls
- = pushSrcLocRn src_loc $
-
- 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)
- -- and what we want to do is simply look them up in the cache;
- -- we jolly well ought to get a 'hit' there!
- mapRn lookupSysBinder names `thenRn` \ names' ->
+ tcdMeths = mbinds})
+ = lookupLocatedTopBndrRn cname `thenM` \ cname' ->
-- Tyvars scope over superclass context and method signatures
- bindTyVarsRn cls_doc tyvars $ \ tyvars' ->
-
- -- Check the superclasses
- rnContext cls_doc context `thenRn` \ context' ->
-
- -- Check the functional dependencies
- rnFds cls_doc fds `thenRn` \ fds' ->
+ bindTyVarsRn cls_doc tyvars ( \ tyvars' ->
+ rnContext cls_doc context `thenM` \ context' ->
+ rnFds cls_doc fds `thenM` \ fds' ->
+ renameSigs okClsDclSig sigs `thenM` \ sigs' ->
+ returnM (tyvars', context', fds', sigs')
+ ) `thenM` \ (tyvars', context', fds', sigs') ->
-- Check the signatures
-- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
let
- (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_`
- mapRn (rnClassOp cname' fds') op_sigs `thenRn` \ sigs' ->
- let
- binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ sig_rdr_names_w_locs = [op | L _ (TypeSig op _) <- sigs]
in
- renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ non_ops' ->
-
+ checkDupNames sig_doc sig_rdr_names_w_locs `thenM_`
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
-- The renamer *could* check this for class decls, but can't
-- for instance decls.
- returnRn (ClassDecl { tcdCtxt = context', tcdName = cname', tcdTyVars = tyvars',
- tcdFDs = fds', tcdSigs = non_ops' ++ sigs', tcdMeths = Nothing,
- tcdSysNames = names', tcdLoc = src_loc})
- where
- cls_doc = text "In the declaration for class" <+> ppr cname
- sig_doc = text "In the signatures for class" <+> ppr cname
-
-rnClassOp clas clas_fds sig@(ClassOpSig op dm_stuff ty locn)
- = pushSrcLocRn locn $
- lookupTopBndrRn op `thenRn` \ op_name ->
-
- -- Check the signature
- rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
-
- -- Make the default-method name
- (case dm_stuff of
- DefMeth dm_rdr_name
- -> -- Imported class that has a default method decl
- -- See comments with tname, snames, above
- lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
- returnRn (DefMeth 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
-
- GenDefMeth -> returnRn GenDefMeth
- NoDefMeth -> returnRn NoDefMeth
- ) `thenRn` \ dm_stuff' ->
-
- returnRn (ClassOpSig op_name dm_stuff' new_ty locn)
-
-finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
- -- Used for source file decls only
- -- Renames the default-bindings of a class decl
-finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
- rn_cls_decl@(ClassDecl {tcdName = cls, tcdTyVars = tyvars}) -- Everything else is here
- -- There are some default-method bindings (abeit possibly empty) so
- -- this is a source-code class declaration
- = -- The newLocals call is tiresome: given a generic class decl
+ -- The newLocals call is tiresome: given a generic class decl
-- class C a where
-- op :: a -> a
-- op {| x+y |} (Inl a) = ...
-- 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
- pushSrcLocRn src_loc $
- extendTyVarEnvForMethodBinds tyvars $
- 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 `elemRdrEnv` name_env)]
- in
- checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
- rnMethodBinds cls gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
- returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
+ extendTyVarEnvForMethodBinds tyvars' (
+ getLocalRdrEnv `thenM` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectHsBindLocatedBinders mbinds
+ gen_rdr_tyvars_w_locs =
+ [ tv | tv <- extractGenericPatTyVars mbinds,
+ not (unLoc tv `elemLocalRdrEnv` name_env) ]
+ in
+ checkDupNames meth_doc meth_rdr_names_w_locs `thenM_`
+ newLocalsRn gen_rdr_tyvars_w_locs `thenM` \ gen_tyvars ->
+ rnMethodBinds (unLoc cname') gen_tyvars mbinds
+ ) `thenM` \ (mbinds', meth_fvs) ->
+
+ returnM (ClassDecl { tcdCtxt = context', tcdLName = cname', tcdTyVars = tyvars',
+ tcdFDs = fds', tcdSigs = sigs', tcdMeths = mbinds'},
+ delFVs (map hsLTyVarName tyvars') $
+ extractHsCtxtTyNames context' `plusFV`
+ plusFVs (map extractFunDepNames (map unLoc fds')) `plusFV`
+ hsSigsFVs sigs' `plusFV`
+ meth_fvs)
where
- meth_doc = text "In the default-methods for class" <+> ppr (tcdName rn_cls_decl)
-
-finishSourceTyClDecl _ tycl_decl@(TyData {tcdDerivs = derivings})
- -- Derivings are returned here so that they don't form part of the tyClDeclFVs.
- -- This is important, because tyClDeclFVs should contain only the
- -- FVs that are `needed' by the interface file declaration, and
- -- derivings do not appear in this. It also means that the tcGroups
- -- are smaller, which turned out to be important for the usage inference. KSW 2002-02.
- = returnRn (tycl_decl,
- maybe emptyFVs extractHsCtxtTyNames derivings)
-
-finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs)
- -- Not a class declaration
-\end{code}
-
-For the method bindings in class and instance decls, we extend the
-type variable environment iff -fglasgow-exts
+ meth_doc = text "In the default-methods for class" <+> ppr cname
+ cls_doc = text "In the declaration for class" <+> ppr cname
+ sig_doc = text "In the signatures for class" <+> ppr cname
-\begin{code}
-extendTyVarEnvForMethodBinds tyvars thing_inside
- = doptRn Opt_GlasgowExts `thenRn` \ opt_GlasgowExts ->
- if opt_GlasgowExts then
- extendTyVarEnvFVRn (map hsTyVarName tyvars) thing_inside
- else
- thing_inside
+badGadtStupidTheta tycon
+ = vcat [ptext SLIT("No context is allowed on a GADT-style data declaration"),
+ ptext SLIT("(You can put a context on each contructor, though.)")]
\end{code}
-
%*********************************************************
%* *
\subsection{Support code for type/data declarations}
%*********************************************************
\begin{code}
-conDeclName :: RdrNameConDecl -> (RdrName, SrcLoc)
-conDeclName (ConDecl n _ _ _ _ l) = (n,l)
-
-rnConDecls :: Name -> DataConDetails RdrNameConDecl -> RnMS (DataConDetails RenamedConDecl)
-rnConDecls tycon Unknown = returnRn Unknown
-rnConDecls tycon (HasCons n) = returnRn (HasCons n)
-rnConDecls tycon (DataCons condecls)
- = -- Check that there's at least one condecl,
- -- or else we're reading an interface file, or -fglasgow-exts
- (if null condecls then
- doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
- getModeRn `thenRn` \ mode ->
- checkRn (glaExts || isInterfaceMode mode)
- (emptyConDeclsErr tycon)
- else returnRn ()
- ) `thenRn_`
-
- mapRn rnConDecl condecls `thenRn` \ condecls' ->
- returnRn (DataCons condecls')
-
-rnConDecl :: RdrNameConDecl -> RnMS RenamedConDecl
-rnConDecl (ConDecl name wkr tvs cxt details locn)
- = pushSrcLocRn locn $
- checkConName name `thenRn_`
- lookupTopBndrRn name `thenRn` \ new_name ->
-
- lookupSysBinder wkr `thenRn` \ new_wkr ->
- -- See comments with ClassDecl
-
- bindTyVarsRn doc tvs $ \ new_tyvars ->
- rnContext doc cxt `thenRn` \ new_context ->
- rnConDetails doc locn details `thenRn` \ new_details ->
- returnRn (ConDecl new_name new_wkr new_tyvars new_context new_details locn)
+rnConDecls :: Name -> [LConDecl RdrName] -> RnM [LConDecl Name]
+rnConDecls tycon condecls
+ = mappM (wrapLocM rnConDecl) condecls
+
+rnConDecl :: ConDecl RdrName -> RnM (ConDecl Name)
+rnConDecl (ConDecl name expl tvs cxt details res_ty)
+ = do { addLocM checkConName name
+
+ ; new_name <- lookupLocatedTopBndrRn name
+ ; name_env <- getLocalRdrEnv
+
+ -- For H98 syntax, the tvs are the existential ones
+ -- For GADT syntax, the tvs are all the quantified tyvars
+ -- Hence the 'filter' in the ResTyH98 case only
+ ; let not_in_scope = not . (`elemLocalRdrEnv` name_env) . unLoc
+ arg_tys = hsConArgs details
+ implicit_tvs = case res_ty of
+ ResTyH98 -> filter not_in_scope $
+ get_rdr_tvs arg_tys
+ ResTyGADT ty -> get_rdr_tvs (ty : arg_tys)
+ tvs' = case expl of
+ Explicit -> tvs
+ Implicit -> userHsTyVarBndrs implicit_tvs
+
+ ; bindTyVarsRn doc tvs' $ \new_tyvars -> do
+ { new_context <- rnContext doc cxt
+ ; new_details <- rnConDetails doc details
+ ; new_res_ty <- rnConResult doc res_ty
+ ; let rv = ConDecl new_name expl new_tyvars new_context new_details new_res_ty
+ ; traceRn (text "****** - autrijus" <> ppr rv)
+ ; return rv } }
where
doc = text "In the definition of data constructor" <+> quotes (ppr name)
-
-rnConDetails doc locn (VanillaCon tys)
- = mapRn (rnBangTy doc) tys `thenRn` \ new_tys ->
- returnRn (VanillaCon new_tys)
-
-rnConDetails doc locn (InfixCon ty1 ty2)
- = rnBangTy doc ty1 `thenRn` \ new_ty1 ->
- rnBangTy doc ty2 `thenRn` \ new_ty2 ->
- returnRn (InfixCon new_ty1 new_ty2)
-
-rnConDetails doc locn (RecCon fields)
- = checkDupOrQualNames doc field_names `thenRn_`
- mapRn (rnField doc) fields `thenRn` \ new_fields ->
- returnRn (RecCon new_fields)
+ get_rdr_tvs tys = extractHsRhoRdrTyVars cxt (noLoc (HsTupleTy Boxed tys))
+
+rnConResult _ ResTyH98 = return ResTyH98
+rnConResult doc (ResTyGADT ty) = do
+ ty' <- rnHsSigType doc ty
+ return $ ResTyGADT ty'
+
+rnConDetails doc (PrefixCon tys)
+ = mappM (rnLHsType doc) tys `thenM` \ new_tys ->
+ returnM (PrefixCon new_tys)
+
+rnConDetails doc (InfixCon ty1 ty2)
+ = rnLHsType doc ty1 `thenM` \ new_ty1 ->
+ rnLHsType doc ty2 `thenM` \ new_ty2 ->
+ returnM (InfixCon new_ty1 new_ty2)
+
+rnConDetails doc (RecCon fields)
+ = checkDupNames doc field_names `thenM_`
+ mappM (rnField doc) fields `thenM` \ new_fields ->
+ returnM (RecCon new_fields)
where
- field_names = [(fld, locn) | (flds, _) <- fields, fld <- flds]
-
-rnField doc (names, ty)
- = mapRn lookupTopBndrRn names `thenRn` \ new_names ->
- rnBangTy doc ty `thenRn` \ new_ty ->
- returnRn (new_names, new_ty)
+ field_names = [fld | (fld, _) <- fields]
-rnBangTy doc (BangType s ty)
- = rnHsType doc ty `thenRn` \ new_ty ->
- returnRn (BangType s new_ty)
+rnField doc (name, ty)
+ = lookupLocatedTopBndrRn name `thenM` \ new_name ->
+ rnLHsType doc ty `thenM` \ new_ty ->
+ returnM (new_name, new_ty)
-- This data decl will parse OK
-- data T = a Int
-- data T = :% Int Int
-- from interface files, which always print in prefix form
-checkConName name
- = checkRn (isRdrDataCon name)
- (badDataCon name)
+checkConName name = checkErr (isRdrDataCon name) (badDataCon name)
+
+badDataCon name
+ = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
\end{code}
%*********************************************************
\begin{code}
-rnFds :: SDoc -> [FunDep RdrName] -> RnMS [FunDep Name]
+rnFds :: SDoc -> [Located (FunDep RdrName)] -> RnM [Located (FunDep Name)]
rnFds doc fds
- = mapRn rn_fds fds
+ = mappM (wrapLocM rn_fds) fds
where
rn_fds (tys1, tys2)
- = rnHsTyVars doc tys1 `thenRn` \ tys1' ->
- rnHsTyVars doc tys2 `thenRn` \ tys2' ->
- returnRn (tys1', tys2')
+ = rnHsTyVars doc tys1 `thenM` \ tys1' ->
+ rnHsTyVars doc tys2 `thenM` \ tys2' ->
+ returnM (tys1', tys2')
-rnHsTyVars doc tvs = mapRn (rnHsTyvar doc) tvs
+rnHsTyVars doc tvs = mappM (rnHsTyvar doc) tvs
rnHsTyvar doc tyvar = lookupOccRn tyvar
\end{code}
-%*********************************************************
-%* *
-\subsection{IdInfo}
-%* *
-%*********************************************************
-
-\begin{code}
-rnIdInfo (HsWorker worker arity)
- = lookupOccRn worker `thenRn` \ worker' ->
- returnRn (HsWorker worker' arity)
-
-rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (HsUnfold inline expr')
-rnIdInfo (HsStrictness str) = returnRn (HsStrictness str)
-rnIdInfo (HsArity arity) = returnRn (HsArity arity)
-rnIdInfo HsNoCafRefs = returnRn HsNoCafRefs
-\end{code}
-
-@UfCore@ expressions.
-
-\begin{code}
-rnCoreExpr (UfType ty)
- = rnHsType (text "unfolding type") ty `thenRn` \ ty' ->
- returnRn (UfType ty')
-
-rnCoreExpr (UfVar v)
- = lookupOccRn v `thenRn` \ v' ->
- returnRn (UfVar v')
-
-rnCoreExpr (UfLit l)
- = returnRn (UfLit l)
-
-rnCoreExpr (UfLitLit l ty)
- = rnHsType (text "litlit") ty `thenRn` \ ty' ->
- returnRn (UfLitLit l ty')
-
-rnCoreExpr (UfFCall cc ty)
- = rnHsType (text "ccall") ty `thenRn` \ ty' ->
- returnRn (UfFCall cc ty')
-
-rnCoreExpr (UfTuple (HsTupCon _ boxity arity) args)
- = mapRn rnCoreExpr args `thenRn` \ args' ->
- returnRn (UfTuple (HsTupCon tup_name boxity arity) args')
- where
- tup_name = getName (dataConWorkId (tupleCon boxity arity))
- -- Get the *worker* name and use that
-
-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' ->
- bindCoreLocalRn bndr $ \ bndr' ->
- mapRn rnCoreAlt alts `thenRn` \ alts' ->
- returnRn (UfCase scrut' bndr' alts')
-
-rnCoreExpr (UfNote note expr)
- = rnNote note `thenRn` \ note' ->
- rnCoreExpr expr `thenRn` \ expr' ->
- returnRn (UfNote note' expr')
-
-rnCoreExpr (UfLam bndr body)
- = rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLam bndr' body')
-
-rnCoreExpr (UfLet (UfNonRec bndr rhs) body)
- = rnCoreExpr rhs `thenRn` \ rhs' ->
- rnCoreBndr bndr $ \ bndr' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfNonRec bndr' rhs') body')
-
-rnCoreExpr (UfLet (UfRec pairs) body)
- = rnCoreBndrs bndrs $ \ bndrs' ->
- mapRn rnCoreExpr rhss `thenRn` \ rhss' ->
- rnCoreExpr body `thenRn` \ body' ->
- returnRn (UfLet (UfRec (bndrs' `zip` rhss')) body')
- where
- (bndrs, rhss) = unzip pairs
-\end{code}
-
-\begin{code}
-rnCoreBndr (UfValBinder name ty) thing_inside
- = rnHsType doc ty `thenRn` \ ty' ->
- bindCoreLocalRn name $ \ name' ->
- thing_inside (UfValBinder name' ty')
- where
- doc = text "unfolding id"
-
-rnCoreBndr (UfTyBinder name kind) thing_inside
- = bindCoreLocalRn name $ \ name' ->
- thing_inside (UfTyBinder name' kind)
-
-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' ->
- bindCoreLocalsRn bndrs $ \ bndrs' ->
- rnCoreExpr rhs `thenRn` \ rhs' ->
- returnRn (con', bndrs', rhs')
-
-rnNote (UfCoerce ty)
- = rnHsType (text "unfolding coerce") ty `thenRn` \ ty' ->
- returnRn (UfCoerce ty')
-
-rnNote (UfSCC cc) = returnRn (UfSCC cc)
-rnNote UfInlineCall = returnRn UfInlineCall
-rnNote UfInlineMe = returnRn UfInlineMe
-
-
-rnUfCon UfDefault
- = returnRn UfDefault
-
-rnUfCon (UfTupleAlt (HsTupCon _ boxity arity))
- = returnRn (UfTupleAlt (HsTupCon tup_name boxity arity))
- where
- tup_name = getName (tupleCon boxity arity)
-
-rnUfCon (UfDataAlt con)
- = lookupOccRn con `thenRn` \ con' ->
- returnRn (UfDataAlt con')
-
-rnUfCon (UfLitAlt lit)
- = returnRn (UfLitAlt lit)
-
-rnUfCon (UfLitLitAlt lit ty)
- = rnHsType (text "litlit") ty `thenRn` \ ty' ->
- returnRn (UfLitLitAlt lit ty')
-\end{code}
%*********************************************************
-%* *
-\subsection{Rule shapes}
-%* *
+%* *
+ Splices
+%* *
%*********************************************************
-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.
-
-\begin{code}
-validRuleLhs foralls lhs
- = check lhs
- where
- check (OpApp _ op _ _) = check op
- check (HsApp e1 e2) = check e1
- check (HsVar v) | v `notElem` foralls = True
- check other = False
-\end{code}
-
-
-%*********************************************************
-%* *
-\subsection{Errors}
-%* *
-%*********************************************************
+Note [Splices]
+~~~~~~~~~~~~~~
+Consider
+ f = ...
+ h = ...$(thing "f")...
+
+The splice can expand into literally anything, so when we do dependency
+analysis we must assume that it might mention 'f'. So we simply treat
+all locally-defined names as mentioned by any splice. This is terribly
+brutal, but I don't see what else to do. For example, it'll mean
+that every locally-defined thing will appear to be used, so no unused-binding
+warnings. But if we miss the dependency, then we might typecheck 'h' before 'f',
+and that will crash the type checker because 'f' isn't in scope.
+
+Currently, I'm not treating a splice as also mentioning every import,
+which is a bit inconsistent -- but there are a lot of them. We might
+thereby get some bogus unused-import warnings, but we won't crash the
+type checker. Not very satisfactory really.
\begin{code}
-badDataCon name
- = hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
-
-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") <+> doubleQuotes (ptext name) <> colon,
- ptext SLIT("Forall'd variable") <+> quotes (ppr var) <+>
- ptext SLIT("does not appear on left hand side")]
-
-emptyConDeclsErr tycon
- = sep [quotes (ppr tycon) <+> ptext SLIT("has no constructors"),
- nest 4 (ptext SLIT("(-fglasgow-exts permits this)"))]
+rnSplice :: HsSplice RdrName -> RnM (HsSplice Name, FreeVars)
+rnSplice (HsSplice n expr)
+ = do { checkTH expr "splice"
+ ; loc <- getSrcSpanM
+ ; [n'] <- newLocalsRn [L loc n]
+ ; (expr', fvs) <- rnLExpr expr
+
+ -- Ugh! See Note [Splices] above
+ ; lcl_rdr <- getLocalRdrEnv
+ ; gbl_rdr <- getGlobalRdrEnv
+ ; let gbl_names = mkNameSet [gre_name gre | gre <- globalRdrEnvElts gbl_rdr,
+ isLocalGRE gre]
+ lcl_names = mkNameSet (occEnvElts lcl_rdr)
+
+ ; return (HsSplice n' expr', fvs `plusFV` lcl_names `plusFV` gbl_names) }
+
+#ifdef GHCI
+checkTH e what = returnM () -- OK
+#else
+checkTH e what -- Raise an error in a stage-1 compiler
+ = addErr (vcat [ptext SLIT("Template Haskell") <+> text what <+>
+ ptext SLIT("illegal in a stage-1 compiler"),
+ nest 2 (ppr e)])
+#endif
\end{code}
projects / ghc-hetmet.git / blobdiff